CN119715617B - A bridge prestressed duct grouting density detection system and detection method - Google Patents
A bridge prestressed duct grouting density detection system and detection methodInfo
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Abstract
本发明提供一种桥梁预应力孔道灌浆密实度检测系统及检测方法，系统包括配置相同的两台采集装置，每一采集装置对应一加速度传感器；每一采集装置均包括时间同步单元、网络通讯单元、信号输入模块和控制单元，时间同步单元用于提供时间戳信息，网络通讯单元用于提供无线通讯；信号输入模块用于获取加速度传感器的信号并预处理得到采样数据，控制单元用于存储采样数据，以及根据两台采集装置的采样数据和时间戳信息，计算两台采集装置的测试波形的首波时间差。本发明通过两套采集设备分别就近采集并无线通信，结合高精度时间戳模块保证信号拾取精度，避免了常规孔道灌浆密实度检测装置存在的不足，提高了孔道灌浆密实度检测装置的适用性和便捷性。
The present invention provides a bridge prestressed duct grouting density detection system and detection method. The system includes two acquisition devices with the same configuration, each acquisition device corresponds to an acceleration sensor; each acquisition device includes a time synchronization unit, a network communication unit, a signal input module and a control unit. The time synchronization unit is used to provide timestamp information, and the network communication unit is used to provide wireless communication; the signal input module is used to obtain the signal of the acceleration sensor and pre-process it to obtain sampling data, and the control unit is used to store the sampling data, and calculate the first wave time difference of the test waveform of the two acquisition devices based on the sampling data and timestamp information of the two acquisition devices. The present invention uses two sets of acquisition equipment to respectively collect data nearby and communicate wirelessly, combined with a high-precision timestamp module to ensure signal pickup accuracy, thereby avoiding the shortcomings of conventional duct grouting density detection devices and improving the applicability and convenience of the duct grouting density detection device.
Description
Technical Field
The invention belongs to the technical field of engineering construction quality detection, and particularly relates to a grouting compactness detection system and method for a bridge prestressed duct.
Background
Along with the rapid development of road and bridge industry in China, the prestressed concrete structure is widely applied to engineering construction so as to make up the defect of tensile strength by means of higher compressive strength of concrete and achieve the aim of deferring concrete cracking in a tension zone. If the grouting is not compact, the prestressed tendons in a high tension state are easy to corrode due to the entering of water and air, so that the effective prestress is reduced. When serious, the prestressed tendons can break, so that the durability and the safety of the bridge are greatly affected. In addition, the defect of grouting quality can also cause the concentration of concrete stress, so that the design stress state of the beam body is changed, and the bearing capacity and the service life of the prestressed concrete bridge are influenced. Therefore, the grouting quality of the pore canal directly influences the safety and durability of the prestressed concrete structure, and has important significance on the overall safety and service life of the prestressed bridge. In order to better control the grouting quality of the pore canal, a professional uses a scientific method and means to carry out inspection and detection on the pore canal, which is an indispensable link.
The tunnel grouting quality detector is based on the basic principle of elastic wave detection technology. The elastic wave generated by excitation forms an external disturbance to the anchor cable in the process of propagating along the anchor cable. Under the action of the disturbance, the anchor cable can generate corresponding vibration. The frequency of its vibration depends on two aspects, namely the frequency of the disturbance force and the natural frequency of the cable bolt. The frequency of the disturbance force is related to the excitation signal, and can be obtained by a signal picked up by a sensor near the excitation point. The natural frequency of the cable is dependent on the tension, cross-sectional area, length and linear density of the cable. When the grouting of the pore canal is not compact, a cavity appears or the grouting material is not solidified, the anchor cable is suspended at two ends in a hollow manner, and the anchor cable can be simplified into two sections of fixed strings. It is easily imaginable that the natural frequency of the string at this time is generally high. On the other hand, when the grout is dense and has cured, the exterior of the cable is coated with the grout material. This corresponds to an increase in the cross-sectional area of the string, which in turn reduces the natural frequency of the anchor cable. Therefore, the grouting compactness of the part of the anchor cable can be measured by analyzing the self-vibration frequency and the excitation frequency of the anchor cable.
The basic principle is that the tunnel grouting quality detector has two functional modes of qualitative detection and positioning detection. The qualitative detection adopts a dual-channel test mode, adopts a full-length wave velocity method (FLPV), a full-length attenuation method (FLEA) and a transfer function method (FLTF) to rapidly perform qualitative detection and evaluation on the pore canal, and preliminarily judges the grouting compactness of the pore canal, and the positioning detection adopts an impact echo equivalent wave velocity method (IEEV) to perform positioning analysis on the defect position.
The channel grouting quality detector comprises 2 acceleration sensors, a magnetic clamping seat, sensor leads, an excitation device and a host, wherein the acceleration sensors are respectively fixed at two ends of an external leakage anchor cable of a channel to be detected by means of the magnetic clamping seat during testing and are used for picking up original excitation signals and signals transmitted by the other end when the original excitation signals are transmitted to the other end along the anchor cable, the magnetic clamping seat is mainly used for fixing the acceleration sensors and the anchor cable to be detected, the sensor leads are mainly used for connecting the two acceleration sensors to the host in a wired mode, namely, the sensors transmit collected signals to the host in a wired mode for processing, the excitation device generally comprises a hand hammer, an excitation cone or an automatic excitation device and is used for exciting and generating elastic waves on the anchor cable to be detected, the 2 acceleration sensors are respectively used for picking up the original excitation elastic waves and the elastic waves transmitted to the other end of the anchor cable, and the host is used for collecting and displaying signal output waveforms of the two acceleration sensors and analyzing the two waveforms in combination with a correlation algorithm, and finally, the grouting compactness of the channel to be detected is realized.
The connection mode is that the host computer is connected with the two paths of acceleration sensors in a wired mode during testing.
The method comprises the steps that during qualitative testing, two paths of acceleration sensors are respectively fixed at the head end and the tail end of an external leakage anchor cable of a pore canal to be tested through magnetic clamping seats, signals of the acceleration sensors at the two ends are collected and circularly stored by a host machine, any end of the external leakage anchor cable is knocked, after a triggering condition is met, the host machine records data with fixed length from the triggering moment of the two paths of acceleration sensors, and the detection method for the bridge prestressed pore canal grouting compactness is qualitatively judged through analyzing characteristic changes such as energy, frequency and wave speed when signals collected by the sensors are transmitted in a detection object. The positioning detection is based on an impact echo method (IE method), and the positions, the scales and the like of grouting defects are subjected to positioning test in a mode of side wall or top (bottom) surface excitation and single acceleration sensor receiving.
The existing method has the following defects in the process of qualitative detection:
1. The qualitative detection of the grouting compactness of the pore canal generally adopts a wired test method, a 2-path sensor is required to be connected to data acquisition equipment in a wired mode, cables are required to be laid on site during the test, the length of a beam slab is different from tens meters to hundreds meters, longer cables are generally required to be used for being compatible with various sites, and the condition that high-altitude operation is required for some cast-in-situ beams can exist. The wired mode is not beneficial to carrying equipment, and meanwhile, the workload and the complexity of on-site cable layout are increased;
2. When the cable is used for testing, the cable is generally longer in length, so that the problems of signal interference and signal loss caused by the cable are faced in actual testing. With the increase of the cable length, the problems of different attenuation and electromagnetic interference of the signals in the transmission process can directly influence the quality of the finally received signals and the overall performance of the system, thereby influencing the test precision;
3. When in detection, the sensor is required to be installed at two ends of the same pore canal to be detected of the beam plate, and the two workers are matched on site. Before testing, the testing sequence needs to be communicated in advance, and the testing is sequentially carried out on all pore canals of the current beam plate. In the process of switching the current duct test to the next duct, the sensors need to be moved to the next duct again, and at the moment, the sensors at the two ends need to be installed on the new duct to be tested. Because two staff are far apart and can not directly acquire the installation condition of the sensor of the other side, the site often needs to be assisted in communication through equipment such as a telephone, an interphone and the like, and the test efficiency is low.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the bridge prestressed duct grouting compactness detection system and the detection method, which are characterized in that two sets of acquisition equipment are used for respectively nearby acquisition and wireless communication, and a high-precision time stamp module is combined to ensure the signal pickup precision, so that the defects of a conventional duct grouting compactness detection device are avoided, and the applicability and the convenience of the duct grouting compactness detection device are improved.
According to one aspect of the specification, the bridge prestressed duct grouting compactness detection system comprises two acquisition devices with the same configuration, each acquisition device corresponds to an acceleration sensor, each acquisition device comprises a time synchronization unit, a network communication unit, a signal input module and a control unit, the time synchronization unit is used for providing timestamp information, the network communication unit is used for providing wireless communication, the signal input module is used for acquiring signals of the acceleration sensors and preprocessing the signals to obtain sampling data, and the control unit is used for storing the sampling data and calculating the head wave time difference of test waveforms of the two acquisition devices according to the sampling data and the timestamp information of the two acquisition devices.
As a further technical scheme, the signal input module comprises a signal interface unit, a signal conditioning unit and a signal acquisition unit, wherein the signal interface unit is used for being connected with the acceleration sensor, the signal conditioning unit is used for preprocessing an accessed signal, and the signal acquisition unit is used for converting the preprocessed signal and outputting the signal to the control unit.
As a further technical scheme, the control unit is also connected with a display unit for displaying sampling data and setting sampling parameters.
As a further technical scheme, the control unit is also connected with a voice unit for voice prompt.
As a further technical scheme, the control unit comprises a storage subunit and an analysis subunit, the storage subunit is used for circularly covering and storing sampling data according to a set length, the analysis subunit is used for controlling the time synchronization unit to record the acquisition time and the trigger time, controlling the network communication unit to send the acquisition instruction and the trigger instruction to the slave machine, and determining the time coordinate positions of the head waves of the master machine and the slave machine according to the sampling data of the master machine and the slave machine and combining with time stamp information.
As a further technical scheme, the storage subunits of the two acquisition devices sample and circularly cover and store sampling data according to a set length in real time, and the circularly cover storage area is at least more than 2 times of single data sampling length.
According to one aspect of the specification, the invention provides a method for detecting grouting compactness of a prestressed duct of a bridge, wherein two ends of a beam body are respectively provided with a collecting device with the same configuration, the collecting device close to a knocking end is used as a host, and the collecting device at the other end is used as a slave, and the method comprises the following steps:
When a host starts to collect, recording the collection time of the host and sending the collection time of the host to a slave, and simultaneously circularly storing sampling values in real time;
The slave receives the collection time of the host, records the collection time of the slave, and simultaneously circularly stores the sampling value in real time;
When the host reaches a trigger level and starts to trigger, recording the trigger time of the host and sending the trigger time of the host to the slave;
the slave receives the trigger time of the host and records the trigger time of the slave;
Determining the time difference of two paths of test waveforms according to the host acquisition time, the slave acquisition time, the host trigger time and the slave trigger time;
When the current measuring point is finished, waveforms are respectively intercepted from the stored data of the host computer and the slave computer, are displayed on the same time coordinate axis, are translated by combining the time difference, and are determined to reach the time coordinate positions of the head wave of the host computer and the slave computer.
As a further technical solution, the method further includes:
And determining the actual measured wave speed of the pore canal according to the head wave time coordinate positions of the knocking waveform reaching the host machine and the slave machine and the full-length wave speed method, and determining the grouting compactness of the pore canal according to the actual measured wave speed.
As a further technical solution, the method further includes:
determining the total number of measuring points to be measured based on the total number of the leakage anchors of the beam body to be measured from top to bottom;
numbering all the measuring points and displaying the measuring points on a host computer and a slave computer respectively;
and testing all the measuring points one by one, and fusing according to the testing data of all the measuring points to obtain the grouting compactness detection result of the pore canal of the current beam body to be tested.
As a further technical solution, the translating in combination with the time difference includes:
according to the time difference, combining the sampling interval to obtain the number of sampling points of the slave waveform to be translated;
And translating the waveforms of the slaves according to the sampling points, so that the waveforms of the master and the slaves are recorded from the same time starting point.
Compared with the prior art, the invention has the beneficial effects that:
The invention discloses a bridge prestressed duct grouting compactness detection device, which is characterized in that two paths of acceleration sensors are respectively acquired through two acquisition devices, and the sensors can be directly installed at a target position without additionally arranging communication cables by adopting a wireless acquisition mode, so that the requirement on long-distance cables is eliminated, and the workload and complexity of on-site arrangement are reduced. This not only simplifies the carrying and mounting process of the device, but also avoids security risks in special scenarios. Meanwhile, the wireless synchronization scheme also effectively solves the problem of long-distance signal transmission attenuation, ensures that effective signals can be accurately picked up by a detection device, reduces noise crosstalk in long-distance transmission, improves the quality of acquired data, can provide stable and reliable measurement results in a wider environment, and ensures the accuracy and reliability of the test. In addition, the method also allows the display unit and the voice prompt unit to confirm whether the two paths of acceleration sensors are positioned at the same anchor position to be detected under the condition that manual intervention is not needed, so that the detection efficiency is remarkably improved. The bridge prestressed duct grouting compactness detection device provided by the invention can be used for avoiding the defects of the conventional duct grouting compactness detection device and improving the applicability and convenience of the duct grouting compactness detection device.
The invention discloses a bridge prestressed duct grouting compactness detection method, which adopts a wireless mode to inform a slave to start acquisition and triggering when a host starts acquisition and triggering, so that the accurate marking of the acquisition time and the triggering time of the slave is realized, the problem that the slave cannot trigger or trigger by mistake is avoided, and the time difference that a knocking waveform reaches two paths of acceleration sensors can be accurately judged when data is intercepted and translated through an accurate time mark, thereby ensuring the accuracy of duct grouting compactness qualitative analysis based on the time difference.
According to the invention, the two acquisition devices sample and circularly cover and store sampling data according to the set length, and the circularly cover and store area is at least more than 2 times of single data sampling length, so that the problem of limited data storage space is solved on the premise of ensuring that effective data cannot be lost in subsequent data shift interception.
In summary, the bridge prestressed duct grouting compactness detection device and the method thereof comprehensively solve the defects existing in the traditional detection means and greatly improve the applicability, convenience and accuracy of duct grouting compactness detection work through integrating wireless communication, high-precision time synchronization, intelligent data management and other advanced technologies.
Drawings
For a clearer description of embodiments of the invention or of solutions according to the prior art, a brief description will be given below of the drawings used in the description of the embodiments or of the prior art, it being obvious that the drawings in the description below are some embodiments of the invention, and that other drawings are obtained from them without the aid of inventive labour for a person skilled in the art.
Fig. 1 is a schematic diagram of a grouting compactness detection system for a prestressed duct of a bridge according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of an acquisition device according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a signal conditioning unit according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of a floating point amplifying module according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of a time synchronization unit according to an embodiment of the present invention.
Fig. 6 is a schematic diagram of a network communication unit according to an embodiment of the present invention.
Fig. 7 is a schematic diagram of a full-length wave velocity method according to an embodiment of the present invention.
Fig. 8 is a schematic view of a cross-sectional translation provided in an embodiment of the present invention.
Detailed Description
It should be noted that:
Aiming at the current situation that one data acquisition device is configured and 2 paths of acceleration sensors are all required to be connected with data acquisition equipment through wires in the prior art, the two paths of acceleration sensors are respectively acquired, namely, two sets of acquisition devices are respectively placed nearby the two paths of sensors at the head and the tail of the beam body to be detected, communication is carried out in a wireless mode, and inconvenience caused by long-distance lead wires in field advanced wiring and field replacement is avoided.
Aiming at the current situation that the signal pickup effect is poor due to overlong cables in the existing wired test mode, the invention configures two acquisition devices to acquire two paths of acceleration sensors respectively, the distance between the acceleration sensors and the acquisition devices is short and is close to connection, and the problem that effective signals cannot be picked up due to signal attenuation or noise crosstalk is solved.
Aiming at the current situation that two paths of acceleration sensors are not positioned on the same anchor to be tested when the measuring points are replaced in the prior art, the invention configures a screen display function on both sets of acquisition devices, before testing, the number of measuring points to be tested is input into any one acquisition device only according to the number of the anchor to be tested, the two acquisition devices synchronously generate a measuring point schematic diagram, when one acquisition device selects the current measuring point, the measuring point on the screen of the other acquisition device is selected, and a voice prompt is given, so that the problem that the two paths of acceleration sensors are not positioned on the same anchor to be tested is avoided.
Aiming at the synchronous acquisition problem of the uncertain triggering time of the two acquisition devices in the wireless scheme, the invention adopts a high-precision time stamp module and a long-distance wireless communication module to inform the slave computer of starting acquisition and triggering in a wireless mode when the host computer starts acquisition and triggering, thereby realizing the accurate marking of the acquisition time and the triggering time of the slave computer, realizing ns-level time synchronous acquisition of two sets of equipment and improving the difference precision of the signal pickup of the two paths of sensors.
Aiming at the problem of limited storage space in a wireless scheme, the invention samples two acquisition devices in real time according to the set length and circularly covers and stores the sampled data, and solves the problem of limited data storage space on the premise of ensuring that effective data cannot be lost in subsequent data shift interception.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. In addition, the technical features of each embodiment or the single embodiment provided by the invention are combined with each other at will to form a new technical scheme, and the combination is not limited by the sequence of steps and/or the structural composition mode, but is necessarily based on the fact that the technical scheme can be realized by one of ordinary skill in the art, and when the technical scheme combination is contradictory or can not be realized, the technical scheme combination is considered to be absent and is not within the protection scope of the invention claimed.
Referring to fig. 1, an embodiment of the invention provides a grouting compactness detection system for a prestressed duct of a bridge, which comprises two acquisition devices with the same parameters, wherein the two acquisition devices are respectively arranged at two ends of a beam body and are in wireless connection with each other, and each acquisition device is connected with an acceleration sensor. When the detection is finished, the time difference of two paths of test waveforms of the master machine and the slave machine is obtained according to the sampling data of the master machine and the slave machine and the timestamp information of the master machine and the slave machine, the actual measurement wave speed is obtained according to the time difference, and then the channel grouting compactness detection result is obtained according to the wave speed.
Referring to fig. 2, each acquisition device includes a signal interface unit IU, a signal conditioning unit CU, a signal acquisition unit SU, an ARM control unit MU, a time synchronization unit TU, a network communication unit NU, a display unit DU, and a voice unit VU. The signal interface unit IU is connected to the signal conditioning unit CU. The signal conditioning unit CU is in turn connected to the signal acquisition unit SU. The signal acquisition unit SU is in turn connected to an ARM control unit MU. The ARM control unit MU is respectively connected with the signal acquisition unit SU, the time synchronization unit TU, the network communication unit NU, the display unit DU and the voice unit VU.
Specifically, the signal interface unit IU adopts a 4-core European connector, so that the acceleration sensor AS can be conveniently and quickly connected, the detection system is conveniently used for collecting sensor signals, and the acceleration sensor IU has a hot plug protection function.
Referring to fig. 3, the signal conditioning unit CU includes a programmable band-pass filter module PM, a floating point amplifying module AM and a single-ended slip differential module CM. The programmable band-pass filter module PM is used for carrying out filtering processing on an input signal of the acceleration sensor AS, and reasonably setting a band-pass filtering range according to a central frequency point of the acceleration sensor AS and a bandwidth range of an effective signal, so that the effective signal is picked up. The floating point amplifying module AM is used for reasonably amplifying the effective signal output by the programmable band-pass filter module PM, and adjusting the received signal to the optimal input range of the subsequent signal acquisition unit SU while meeting the requirement of the dynamic range required by the detection, so that the overall signal-to-noise ratio of the signal to be acquired is improved. The single-ended-to-differential module CM is used for converting a single-ended signal output by the floating point amplifying module AM into a differential signal, and improving the anti-interference performance and stability of a signal to be acquired.
Specifically, the programmable band-pass filter module PM selects an LTC1068 active filter of ADI company, and adjusts the band-pass filter center frequency point and bandwidth by adjusting the peripheral resistance capacitance value.
Referring to fig. 4, the floating point amplifying module AM is composed of a window comparator WC, a reference voltage VF and an instrumentation amplifier IA. The window comparator WC integrates a plurality of groups of input comparison ports, and one group of input ports comprises two paths of input pins to form one path of output signals. During actual test, the reference voltage VF outputs several reference voltage sources, the reference voltage VF is respectively connected to corresponding input pins in a plurality of groups of input ports of the window comparator WC according to design requirements, effective signals output by the programmable band-pass filter module PM are also connected to corresponding input pins in a plurality of groups of input ports of the window comparator WC according to the design requirements, namely, the effective signals are simultaneously respectively compared with voltage sources of different grades, the multiplexing output pins of the window comparator WC also output corresponding high-low level signals according to comparison results, the output high-low level signals are connected to the instrument amplifier IA, so that reasonable amplification of the effective signals of different amplitudes is realized, and the effective acquisition of the signal acquisition unit SU is facilitated.
Specifically, the window comparator WC selects a four-way differential comparator LM339 of TI company, which can compare four groups of input voltages in real time, and output high-low level signals according to the comparison result, and is connected to the program-controlled amplifying pin of the instrumentation amplifier IA. The reference voltage VF selects LF347 four-channel operational amplifier of TI company, and can provide four paths of reference source access window comparators WC for comparison by matching with different resistance values. The instrument amplifier IA selects an ADI company programmable instrument amplifier AD8253, and reasonably amplifies the sensor signal according to the comparison result output by the window comparator WC.
The signal acquisition unit SU is configured to acquire a signal processed by the programmable band-pass filter module PM, the floating point amplification module AM, and the single-ended differential module CM, and convert an analog signal into a digital signal, so that the ARM control unit MU performs digital signal processing.
Specifically, the signal acquisition unit SU selects an analog-to-digital converter LTC2389 of ADI company, and the sampling rate can reach 2.5M, so as to meet the requirement of high-precision real-time sampling.
ARM control unit MU processes the digital signal output by signal acquisition unit SU based on the timestamp information output by time synchronization unit TU, combines the correlation algorithm, and shows on display unit DU, communicates with another channel grouting acquisition device through network communication unit NU, guides operating personnel to carry out corresponding suggestion by means of voice unit VU, finally accomplishes whole test flow.
Specifically, the ARM control unit MU selects a ZYNQ-7000 processor with high performance of the Siring company, the ARM processor is used for information interaction, outputting pulse signals to the time synchronization unit TU to acquire time stamp information of trigger time, the ARM control unit MU is connected with the display unit DU through a bus interface to facilitate acquisition parameter setting and sampling waveform display of a user, the ARM control unit MU is connected with the network communication unit NU through an SPI interface to be used for wireless communication, and the FPGA processor is used for controlling sampling time sequence of the signal acquisition unit SU, simultaneously reading sampling data in real time and circularly storing the sampling data in the SRAM.
Referring to fig. 5, the time synchronization unit TU has an event triggering function, and can output high-precision time stamp information, so as to facilitate the processing of the acquisition signal by the ARM control unit MU. The time synchronization unit TU comprises a high-precision time stamp module TM and an antenna ANT1, the high-precision time stamp module TM has an event triggering function, the ARM control unit MU outputs a single pulse signal to the high-precision time stamp module TM, the high-precision time stamp module TM can mark the rising edge time of a trigger pulse and output high-precision time stamp information, and the antenna ANT1 is used for receiving satellite signals.
Specifically, the time synchronization unit TU selects a high-precision GPS module with an event triggering function of the sienna synchronization electronic technology limited company, and can output ns-level time stamp information.
Referring to fig. 6, the network communication unit NU mainly realizes information interaction between the two grouting collection devices in a wireless communication working mode, where the network communication unit NU includes a wireless communication module WM and an antenna ANT2, the wireless communication module WM is a dual-frequency long-distance wireless communication module, so that the requirement of large-span wireless communication of the two grouting collection devices can be met, and the antenna ANT2 is used for transmitting and receiving wireless signals.
Specifically, the network communication unit NU selects a high-power wireless communication module with a 5.8G frequency band, supports an AP mode, a client mode, a relay and route mode, and can meet the requirement of remote communication.
The display unit DU comprises a man-machine interaction interface integrating touch control and display, and can be used for performing functions of related parameter setting, acquisition state switching, current measuring point linkage of two channel grouting acquisition devices at two ends of a channel to be detected, real-time sampling data, analysis result display and the like.
Specifically, the display unit DU selects a 6-inch touch screen to display the sampled data, and the user can set the sampling parameters through the display unit DU.
The voice unit VU is mainly used for prompting each state in the acquisition process, and guiding operators at two ends of the pore canal to be detected to correctly execute corresponding operations when retesting or replacing the next point to be detected, so that the detection process is ensured to be carried out smoothly.
Specifically, the voice unit VU selects SYN6658 chinese voice synthesis chip of the scientific and technical company under beijing space, and is connected with the ARM control unit MU through a serial port, so that voice characters to be broadcasted are converted into corresponding characters, and when in actual use, the ARM control unit MU writes the corresponding characters through the serial port, so that prompt to a user can be realized.
The embodiment of the invention provides a grouting compactness detection system for a bridge prestressed duct, which has the implementation modes that:
In qualitative detection, two acquisition devices DT1 and DT2 are respectively placed at two ends of a beam body to be detected, based on the total number of anchor devices leaked from top to bottom of the beam body to be detected, the total number of measuring points to be detected is input into any one acquisition device, the two acquisition devices carry out measuring point linkage through a network communication unit NU, namely a measuring point schematic diagram is formed on each display unit DU, and the measuring points are numbered sequentially from top to bottom.
As any one end can be used as a trigger end, when in detection, the acquisition device close to one end of the knocking is defined as a master, and the acquisition device far away from one end of the knocking is defined as a slave. The number of the current measuring point to be measured is selected on the host computer through the display unit DU, the measuring point on the slave computer display unit DU is also selected synchronously, and the two paths of acceleration sensors AS are respectively installed on the currently selected measuring point to be measured through the prompt of the voice unit VU. After one end of the test is knocked, the test data can be compared by knocking the other end of the current test point.
When the test is started, a sampling start button is clicked on the host through the display unit DU, and the slave also executes the sampling operation through the linkage of the network communication unit NU and the slave. The time period from the beginning of sampling to the triggering is uncertain, and the device needs to trigger a part of data before the moment when the device processes the subsequent data, so that the acquisition device needs to store the sampled data from the beginning of acquisition. However, because the data storage space is limited, the two acquisition devices sample and circularly cover and store the sampled data according to the set length, and the circularly cover storage area is at least more than 2 times of the single data sampling length, so that the effective data cannot be lost in the subsequent data shift interception.
When the host starts to collect, the host gives a pulse signal to the time synchronization unit TU, records the current moment, defines as T A0, and informs the slave of the start of the collection in a wireless mode. When the slave receives the acquisition starting instruction, a trigger signal is given to an internal time synchronization unit TU, the acquisition starting time T B0 of the slave is recorded, and the sampling value is circularly stored in real time.
The method comprises the steps that a point to be measured is knocked through a shock hammer EH and a shock cone EC, when the trigger generation level is reached, a host starts triggering, a pulse signal is given to an internal time synchronization unit TU, the current trigger time is recorded and is defined as T A1, and a slave is informed of starting triggering in a wireless mode. When receiving the start trigger instruction, the slave machine sends a trigger signal to the internal time synchronization unit TU, and records the start trigger time T B1 of the slave machine. In the same time axis, the time difference between the two paths of test waveforms is |T B1-TA1|-|TB0-TA0 |, and in essence, a section of waveform is intercepted in two different storage areas respectively, and is displayed on the same time axis, and the time synchronization unit TU provides a data interception translation time base point.
After the data of the set point number is collected, the slave uploads the sampled data to the host, and as the sampling interval and the single sampling point number of the host and the slave are the same, the host starts recording two paths of sampling signals from the same time point in a data interception translation mode through the product of the sampling interval and the sampling point number. When the host computer collects the interface, 2 waveforms can be displayed respectively with the same time coordinate axis. By adopting a software head wave judging mode, the head wave time coordinate positions of the knocking waveform reaching the host machine and the slave machine can be respectively determined and marked as T ch1 and T ch2, qualitative analysis of grouting compactness of the to-be-detected hole can be realized through the time difference, and the translation schematic diagram can be referred to as figure 8.
It should be noted that, in the above description, when the host triggers, the slave is informed to start triggering in a wireless manner, that is, the current data point position is marked, because if the slave depends on the triggering level to trigger, the triggering level of the slave cannot be set correctly due to the difference between the length of the hole to be detected and the compactness, the slave cannot trigger due to the excessively high triggering level, and when the host triggers, the slave is informed to start triggering to mark, so that the problem can be avoided, the time difference that the knocking waveform reaches the two paths of acceleration sensors AS can be accurately judged through the translation of the time difference, and the qualitative analysis of the grouting compactness of the hole to be detected can be realized through the time difference.
The concrete calculation mode of the qualitative analysis of the grouting compactness of the to-be-detected hole is as follows:
According to the propagation rule of the elastic wave in the medium, the propagation speed, the energy attenuation speed, the frequency change and the like of the elastic wave are closely related to the property of the medium. In general, the medium with higher intensity and higher density is more beneficial to the propagation of elastic waves, and the wave speed in the corresponding propagation process is higher. When the grouting quality of the pore canal is detected, whether grouting is full has obvious influence on the propagation wave speed of the elastic wave, generally, the propagation speed of the elastic wave in a steel strand is about 5.01km/s, the propagation speed in concrete is about 4.0km/s, and the actual measured wave speed of the pore canal is between the two. Referring to fig. 7, when the grouting of the duct is full, the grouting compactness is high, the wave speed is more similar to the wave speed of the concrete, when the grouting of the duct is not full, the grouting compactness is low, the wave speed is more similar to the wave speed of the steel strand, and the wave speed is approximately proportional. According to the rule, the grouting compactness of the pore canal can be calculated through the wave speed.
(I PV), i.e. according to measured wave velocityThe anchor rope to be measured calibrates the wave velocityAnd the peripheral concrete of the anchor cable to be measured is calibrated to wave velocityThe interrelationship between them is calculated. And when I PV is equal to 0, the measured wave speed is equal to the wave speed of the anchor cable, which is equal to that of unglued, and when the compactness is 0,I PV , which is equal to that of concrete, the measured wave speed is equal to that of concrete, which is equal to that of full grouting, and the compactness is 1.
The measured wave velocity is obtained according to the analysis of two paths of measured waves, namely, according to the arrival time T ch1 and T ch2 of the head waves of the two paths of waves, the length L of the beam plate, the distances between the two paths of acceleration sensors AS and the beam plate are recorded AS L 1 and L 2, and the height difference of the pore canal (the height difference between the lowest point of the pore canal and the two ends) is H. The corrected tunnel length is L Hole(s) and the wave velocity is calculated as follows:
because the number of the measuring points is multiple, after the wave speed of each measuring point is obtained, the average wave speed can be obtained through calculation in a data fusion mode, such as a statistical average mode, and then the grouting compactness detection result of the beam body to be detected is determined.
Based on the same inventive concept as the embodiment of the system, the embodiment of the invention also provides a method for detecting grouting compactness of a prestressed duct of a bridge, wherein the two ends of the beam body are respectively provided with a collecting device with the same configuration, the collecting device close to a knocking end is used as a host, and the collecting device at the other end is used as a slave, and the method comprises the following steps:
s1, when a host starts to collect, controlling a time synchronization unit TU of the host to record a host collection time T A0, sending the host collection time to a slave through a network communication unit NU, and simultaneously circularly storing sampling values in real time;
s2, when the slave receives the acquisition time of the host, the time synchronization unit TU of the slave is controlled to record the acquisition time T B0 of the slave, and meanwhile, sampling values are circularly stored in real time;
S3, when the host reaches a trigger level and starts to trigger, controlling a time synchronization unit TU of the host to record a host trigger time T A1, and sending the host trigger time to the slave through a network communication unit NU;
S4, the slave receives the trigger time of the master and simultaneously controls a time synchronization unit TU of the slave to record a trigger time T B1 of the slave;
s5, determining the time difference |T B1-TA1|-|TB0-TA0 | of two paths of test waveforms according to the host acquisition time, the slave acquisition time, the host trigger time and the slave trigger time;
S6, when the current measuring point is finished, a section of waveform is intercepted from the storage areas of the host computer and the slave computer respectively, the waveforms are displayed on the same time coordinate axis, the sampling points of the slave computer waveform to be translated are obtained according to the time difference and the sampling interval, and then the waveforms of the host computer and the slave computer are translated according to the sampling points, so that the waveforms of the host computer and the slave computer start to be recorded from the same time starting point, and the time coordinate positions of the head waves of the knocking waveforms reaching the host computer and the slave computer are determined.
After determining that the knocking waveform reaches the time coordinate position of the head wave of the host machine and the slave machine, determining the actual measured wave speed of the pore canal according to the full-length wave speed method, and determining the grouting compactness of the pore canal according to the actual measured wave speed.
Before the test starts, the method further comprises the steps of determining the total number of the to-be-tested measuring points based on the total number of the to-be-tested beam body leakage anchorage devices from top to bottom, numbering all the measuring points and displaying the measuring points on a host machine and a slave machine respectively, testing all the measuring points one by one, and fusing according to test data of all the measuring points to obtain a channel grouting compactness detection result of the current to-be-tested beam body.
It should be noted that, each step of the method embodiment of the present invention may be implemented by referring to the system embodiment, which is not described herein.
The terms "comprises" and "comprising," along with any variations thereof, in the description and claims of the invention and in the foregoing drawings, are intended to cover non-exclusive inclusion, such as a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements that are expressly listed or inherent to such process, method, article, or apparatus.
The block diagrams depicted in the figures are merely functional entities and do not necessarily correspond to physically separate entities. That is, the functional entities may be implemented in software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor devices and/or microcontroller devices. The flow diagrams depicted in the figures are exemplary only, and do not necessarily include all of the elements and operations/steps, nor must they be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the order of actual execution may be changed according to actual situations.
It should be noted that the above-mentioned embodiments are merely for illustrating the technical solution of the present invention, and not for limiting the same, and although the present invention has been described in detail with reference to the above-mentioned embodiments, it should be understood by those skilled in the art that the technical solution described in the above-mentioned embodiments may be modified or some or all of the technical features may be equivalently replaced, and these modifications or substitutions do not deviate from the essence of the corresponding technical solution from the technical solution of the embodiment of the present invention.
Claims (10)
1. A bridge prestressed duct grouting compactness detection system is characterized by comprising two identical acquisition devices, wherein each acquisition device corresponds to an acceleration sensor, each acquisition device comprises a time synchronization unit, a network communication unit, a signal input module and a control unit, the time synchronization units are used for providing timestamp information, the network communication units are used for providing wireless communication, the signal input modules are used for acquiring signals of the acceleration sensors and preprocessing to obtain sampling data, the control units are used for storing the sampling data, and calculating the head wave time difference of test waveforms of the two acquisition devices according to the sampling data and timestamp information of the two acquisition devices, the control units are further used for recording the acquisition time of a host computer and sending the acquisition time of the host computer to the slave computer when the host computer starts acquisition, simultaneously circularly storing sampling values in real time, recording the acquisition time of the slave computer and simultaneously circularly storing the sampling values when the host computer reaches a trigger level, recording the trigger time of the host computer and sending the trigger time of the host computer to the slave computer, recording the trigger time of the slave computer, and determining the trigger time of the slave computer and the test waveform difference of the slave computer according to the trigger time of the slave computer.
2. The bridge prestressed duct grouting compactness detection system of claim 1, wherein the signal input module comprises a signal interface unit, a signal conditioning unit and a signal acquisition unit, the signal interface unit is used for being connected with an acceleration sensor, the signal conditioning unit is used for preprocessing an accessed signal, and the signal acquisition unit is used for converting the preprocessed signal and outputting the signal to the control unit.
3. The bridge prestressed duct grouting compactness detection system of claim 1, wherein the control unit is further connected with a display unit for displaying sampling data and setting sampling parameters.
4. The bridge prestressed duct grouting compactness detection system of claim 1, wherein the control unit is further connected with a voice unit for voice prompt.
5. The bridge prestressed duct grouting compactness detection system of claim 1, wherein the control unit comprises a storage subunit and an analysis subunit, the storage subunit is used for circularly covering and storing sampling data according to a set length, the analysis subunit is used for controlling the time synchronization unit to record the acquisition time and the trigger time, controlling the network communication unit to send the acquisition instruction and the trigger instruction to the slave, and determining the head wave time coordinate positions of the master and the slave according to the sampling data of the master and the slave and combining with time stamp information.
6. The bridge prestressed duct grouting compactness detection system of claim 5, wherein the storage subunits of the two acquisition devices sample and cyclically cover and store the sampled data according to a set length, and the cyclically cover storage area is at least more than 2 times of the single data sampling length.
7. The method is characterized in that acquisition devices with the same configuration are respectively arranged at two ends of a beam body, each acquisition device is connected with an acceleration sensor, the acquisition device close to a knocking end is used as a host, and the acquisition device at the other end is used as a slave, and the method comprises the following steps:
When a host starts to collect, recording the collection time of the host and sending the collection time of the host to a slave, and simultaneously circularly storing sampling values in real time;
The slave receives the collection time of the host, records the collection time of the slave, and simultaneously circularly stores the sampling value in real time;
When the host reaches a trigger level and starts to trigger, recording the trigger time of the host and sending the trigger time of the host to the slave;
the slave receives the trigger time of the host and records the trigger time of the slave;
Determining the time difference of two paths of test waveforms according to the host acquisition time, the slave acquisition time, the host trigger time and the slave trigger time;
When the current measuring point is finished, waveforms are respectively intercepted from the stored data of the host computer and the slave computer, are displayed on the same time coordinate axis, are translated by combining the time difference, and are determined to reach the time coordinate positions of the head wave of the host computer and the slave computer.
8. The method for detecting grouting compactness of a prestressed duct of a bridge according to claim 7, further comprising:
And determining the actual measured wave speed of the pore canal according to the head wave time coordinate positions of the knocking waveform reaching the host machine and the slave machine and the full-length wave speed method, and determining the grouting compactness of the pore canal according to the actual measured wave speed.
9. The method for detecting grouting compactness of a prestressed duct of a bridge according to claim 7, further comprising:
determining the total number of measuring points to be measured based on the total number of the leakage anchors of the beam body to be measured from top to bottom;
numbering all the measuring points and displaying the measuring points on a host computer and a slave computer respectively;
and testing all the measuring points one by one, and fusing according to the testing data of all the measuring points to obtain the grouting compactness detection result of the pore canal of the current beam body to be tested.
10. The method for detecting grouting compactness of a prestressed duct of a bridge according to claim 7, wherein the translating in combination with the time difference comprises:
according to the time difference, combining the sampling interval to obtain the number of sampling points of the slave waveform to be translated;
And translating the waveforms of the slaves according to the sampling points, so that the waveforms of the master and the slaves are recorded from the same time starting point.
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| CN102818852A (en) * | 2011-06-10 | 2012-12-12 | 杭州海儿科技有限公司 | Test method and system for grouting compactness of pre-stressed duct of bridge |
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| CN102507743A (en) * | 2011-11-03 | 2012-06-20 | 北京星通联华科技发展有限公司 | Nondestructive testing method of bridge prestressed duct grouting compactness |
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