CN113376018A - Method and system for detecting tension force torque of prestressed finish-rolling threaded steel bar of concrete bridge - Google Patents
Method and system for detecting tension force torque of prestressed finish-rolling threaded steel bar of concrete bridge Download PDFInfo
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- CN113376018A CN113376018A CN202110692293.4A CN202110692293A CN113376018A CN 113376018 A CN113376018 A CN 113376018A CN 202110692293 A CN202110692293 A CN 202110692293A CN 113376018 A CN113376018 A CN 113376018A
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Abstract
本发明涉及张拉力扭矩检测技术领域，公开了混凝土桥梁预应力精轧螺纹钢筋张拉力扭矩检测系统，包括精轧螺纹钢筋、波纹管、张拉端锚垫板、固定端锚垫板、套筒和数显式电动扭矩扳手，精轧螺纹钢筋上端通过张拉端锚具与张拉端锚垫板相连，精轧螺纹钢筋下端通过固定端锚具与固定端锚垫板相连，套筒设置在张拉端锚具上，数显式电动扭矩扳手套装在套筒上，有效解决了预应力精轧螺纹钢筋张拉力损失过大的问题，有效的防止预应力混凝土结构开裂或失效，提高了结构稳定性和可靠性。还公开了混凝土桥梁预应力精轧螺纹钢筋张拉力扭矩检测方法，易于操作，能满足施工现场大面积检测的要求，可适应于多种规格的精轧螺纹钢筋预应力体系。
The invention relates to the technical field of tension torque detection, and discloses a tension torque detection system for prestressed finishing threaded steel bars for concrete bridges, including finishing threaded steel bars, corrugated pipes, tension end anchor plates, fixed end anchor plates, sleeves And digital display electric torque wrench, the upper end of the finishing threaded steel bar is connected with the tensioning end anchor plate through the tensioning end anchor, and the lower end of the finishing threaded steel bar is connected with the fixed end anchoring plate through the fixed end anchoring device, and the sleeve is set in On the tensioning end anchorage, the digital display electric torque wrench is set on the sleeve, which effectively solves the problem of excessive tension loss of the prestressed finishing threaded steel bar, effectively prevents the cracking or failure of the prestressed concrete structure, and improves the structural performance. Stability and reliability. Also disclosed is a method for detecting the tension and torque of prestressed finishing threaded steel bars for concrete bridges, which is easy to operate, can meet the requirements of large-area detection on construction sites, and can be adapted to prestressed systems of finishing threaded steel bars of various specifications.
Description
Technical Field
The invention relates to the technical field of tension torque detection, in particular to a method and a system for detecting tension torque of a prestressed finish rolling threaded steel bar of a concrete bridge.
Background
The method has the advantages of high strength, low looseness, no welding quality restriction on connection, simple construction, convenient anchoring and the like, and is widely applied to a large-span concrete box girder bridge web vertical prestressed system. However, the web cracking problem occurs in the construction and operation processes of many concrete box girder bridges, and the related documents disclose that the application of the vertical prestress of the web cannot completely prevent the cracking of the web of the concrete box girder bridge, and one of the main reasons is that the prestress loss is caused by different construction proficiency of workers, jack oil gauge errors, anchor backing plate installation errors and the like in the stretching construction of the prestress finish rolling threaded steel bars. When the loss of the vertical prestress tension force is too large, the main tension stress of the box girder web cannot be effectively reduced, the web is easy to generate an oblique crack, and the durability and the safety of the bridge are seriously influenced. Therefore, it is important to provide an effective detection method and formulate a corresponding detection standard for effectively detecting the tension quality of the finish-rolled threaded steel bar in the construction process.
At present, two tensioning methods for finish rolling twisted steel in China are mainly adopted, one method is a feed-through pressure sensor and a hydraulic jack tensioning method, and the method has the defects of inconvenient construction, high cost and the like; the other method is a nondestructive testing method by establishing and identifying a mathematical model between the rigidity change coefficient of the exposed end of the finish-rolled twisted steel and the natural vibration frequency and effective tension force, and the method has the defects of inaccurate identification of the rigidity change coefficient and the natural vibration frequency of the exposed end of the finish-rolled twisted steel and the like. Both methods can not meet the requirement of large-area detection on the tension quality of finish-rolled threaded steel bars on construction sites. Therefore, it is necessary to provide a tension force detection method and system for the prestressed finish-rolled threaded steel bar, which is accurate, economical and rapid.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a system for detecting the tension and torque of a prestressed finish-rolled twisted steel bar of a concrete bridge, which effectively solves the problem of overlarge tension loss of the prestressed finish-rolled twisted steel bar, effectively prevents a prestressed concrete structure from cracking or losing efficacy, and improves the structural stability and reliability.
One of the purposes of the invention is realized by adopting the following technical scheme:
the system for detecting the tension force torque of the prestressed finish-rolled threaded steel bar of the concrete bridge comprises a finish-rolled threaded steel bar, a corrugated pipe, a tension end anchor backing plate, a fixed end anchor backing plate, a sleeve and a digital display type electric torque wrench;
the tensioning end anchor backing plate and the fixed end anchor backing plate are arranged in the concrete bridge web plate in an up-down parallel manner;
the finish-rolled twisted steel sequentially penetrates through the tensioning end anchor backing plate and the fixed end anchor backing plate, wherein the upper end of the finish-rolled twisted steel is connected with the tensioning end anchor backing plate through a tensioning end anchorage device, and the lower end of the finish-rolled twisted steel is connected with the fixed end anchor backing plate through a fixed end anchorage device;
the corrugated pipe is sleeved on the finish-rolled twisted steel, and the corrugated pipe is positioned between the tensioning end anchor backing plate and the fixed end anchor backing plate;
the sleeve is arranged on the tensioning end anchorage device;
the digital display type electric torque wrench is sleeved on the sleeve and is connected with a torque wrench reaction force arm.
Further, still include portable power, portable power and digital display formula electric torque wrench electric connection.
Further, the device also comprises an axial force meter, wherein the axial force meter is arranged between the fixed end anchorage device and the fixed end anchorage backing plate.
Furthermore, the corrugated pipe is sleeved with a spiral rib.
Furthermore, the tensioning end anchorage and the fixed end anchorage are both nuts.
The invention also aims to provide the tension force and torque detection method for the pre-stressed finish-rolled threaded steel bar of the concrete bridge, which is easy to operate, can meet the requirement of large-area detection on a construction site and can be suitable for finish-rolled threaded steel bar pre-stressed systems with various specifications.
The second purpose of the invention is realized by the following steps:
s1, selecting a plurality of finish-rolled threaded steel bars to carry out detection tests and passing
Calculating the torque coefficient of the prestressed finish rolling threaded steel bar connecting pair, and finally obtaining the average value of the torque coefficient of the finish rolling threaded steel bar connecting pair;
s2, calculating to obtain a tension control torque value of the prestressed finish rolling twisted steel through the T-PKd;
s3, performing tensioning construction on the prestressed finish rolling threaded steel bars through the tensioning control torque value obtained in the S2;
and S4, detecting the torque and the tensile force of the prestress finish rolling threaded steel bar.
Further, the detection test of S1 specifically includes the steps of: and screwing the tension end anchorage device through the digital display type electric torque wrench until the axial force meter reaches the tension force design value of the finish rolling threaded steel bar, and recording the numerical values of the axial force meter and the digital display type electric torque wrench at the moment.
Further, the specific construction step of S3 is: and screwing the tensioning end anchorage device through the digital display type electric torque wrench, and stopping the digital display type electric torque wrench from rotating until the torque value reaches the tensioning control torque value.
Further, the specific step of detecting in S4 is: loosening the anchorage at the tensioning end by a digital display type electric torque wrench, taking the instantaneous torque value as the actual measurement torque value of the tension force of the prestressed finish-rolled threaded steel bar when the anchorage at the tensioning end is loosened, and then passing the actual measurement torque value
And calculating to obtain the measured tension of the pre-stressed finish-rolled twisted steel.
Further, the interval time between S3 and S4 is 1 hour to 48 hours.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the tension detection system for the finish-rolled threaded steel bar, the digital display type electric torque wrench is used for screwing and tensioning, the torque value can be accurately controlled, the problem of overlarge tension loss of the pre-stressed finish-rolled threaded steel bar is effectively solved, the prestressed concrete structure is effectively prevented from cracking or losing efficacy, and the structural stability and reliability are improved.
(2) The tension force detection method for the finish-rolled threaded steel bar is easy to operate, can meet the requirement of large-area detection on a construction site, and is suitable for finish-rolled threaded steel bar prestress systems of various specifications.
Drawings
FIG. 1 is a schematic structural view of a system for detecting a torque coefficient of a finish-rolled twisted steel bar connection pair according to the present invention;
FIG. 2 is a schematic structural diagram of a system for detecting the torque and the tensile force of a pre-stressed finish-rolled twisted steel bar according to the present invention.
In the figure: 1. finish rolling the twisted steel; 2. a bellows; 3. a spiral rib; 4. a tension end anchorage; 5. a fixed end anchorage device; 6. tensioning the end anchor backing plate; 7. the fixed end is an anchor backing plate; 8. a sleeve; 9. a digital display electric torque wrench; 10. a torque wrench reaction arm; 11. a mobile power supply; 12. an axial force meter.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.
Embodiment 1 concrete bridge prestressing finish rolling twisted steel tension force torque detecting system
A concrete bridge prestress finish rolling deformed bar 1 tension force torque detection system comprises a finish rolling deformed bar 1, a corrugated pipe 2, a tension end anchor backing plate 6, a fixed end anchor backing plate 7, a sleeve 8 and a digital display type electric torque wrench 9, wherein the tension end anchor backing plate 6 and the fixed end anchor backing plate 7 are arranged in a concrete bridge web in an up-down parallel mode, the finish rolling deformed bar 1 sequentially penetrates through the tension end anchor backing plate 6 and the fixed end anchor backing plate 7, the upper end of the finish rolling deformed bar 1 is connected with the tension end anchor backing plate 6 through a tension end anchorage device 4, the lower end of the finish rolling deformed bar 1 is connected with the fixed end anchor backing plate 7 through an anchorage device fixed end 5, the corrugated pipe 2 is sleeved on the finish rolling deformed bar 1, the corrugated pipe 2 is positioned between the tension end anchor backing plate 6 and the fixed end anchor backing plate 7, the sleeve 8 is arranged on the tension end anchorage device 4, the digital display type electric torque wrench 9 is sleeved on the sleeve 8, the digital display type electric torque wrench 9 is connected with a torque wrench reaction force arm 10.
As the preferred embodiment, still include portable power source 11, portable power source 11 and digital display formula electric torque wrench 9 electric connection improve the removal convenience, can follow the nimble removal in construction place.
As a preferred embodiment, the device further comprises an axial force meter 12, wherein the axial force meter 12 is arranged between the fixed-end anchorage device 5 and the fixed-end anchorage backing plate 7, and the axial force meter 12 is used for detecting whether the tension of the finish-rolled threaded steel bar 1 reaches a designed value or not when the digital display type electric torque wrench 9 applies the twisting and tensioning end anchorage device 4, so that accurate control is realized.
In a preferred embodiment, the corrugated pipe 2 is externally sleeved with the spiral ribs 3, and the spiral ribs 3 improve the compressive strength of the concrete after anchoring, prevent the concrete under anchoring from generating local damage under the action of tensile stress and improve the reliability.
In a preferred embodiment, both the tensioning end anchorage 4 and the fixed end anchorage 5 are nuts.
In the embodiment 2, the average value of the torque coefficient of the connection pair of the finish-rolled twisted steel 1 is obtained through the detection test, the tension control torque value of the pre-stressed finish-rolled twisted steel 1 is obtained, and the tension construction of the pre-stressed finish-rolled twisted steel 1 is carried out.
As shown in fig. 1, finish-rolled twisted steel bars 1 for testing should be randomly extracted from a lot to be installed at a construction site, and 3 sets of each specification should be extracted for testing. Before the test, the finish-rolled twisted steel bar 1 penetrates into an axial force meter 12, and the axial force meter 12 is arranged between the fixed-end anchorage device 5 and the fixed-end anchorage backing plate 7. Starting the digital display type electric torque wrench 9 to twist and tension the end anchorage 4 during the test until the shaft force meter 12 reaches the tension force design value of the finish rolling threaded steel bar 1, recording the numerical values of the shaft force meter 12 and the digital display type electric torque wrench 9, and passing through
And calculating the torque coefficient of the connecting pair of the prestress finish rolling twisted steel 1. And selecting the average value of the torque coefficient tests of the connecting pair of 3 sets of finish-rolled twisted steel bars 1 as the torque coefficient during construction. In the above formula: t is a tensioning control torque of the prestressed finish-rolled twisted steel bar 1 or a tensioning screwing torque (N.m) of the prestressed finish-rolled twisted steel bar 1, P is a tensioning control force of the prestressed finish-rolled twisted steel bar 1 or a designed value of a tensile force of the prestressed finish-rolled twisted steel bar 1 or an actual measured value (kN) of the tensile force of the prestressed finish-rolled twisted steel bar 1, K is a connecting pair torque coefficient of the prestressed finish-rolled twisted steel bar 1, and d is a nominal diameter (mm) of the prestressed finish-rolled twisted steel bar 1.
The specific calculation process is as follows: the diameter d of the finish-rolled threaded steel bar 1 is 32mm, the design standard stress fpk of the prestressed finish-rolled threaded steel bar 1 is 785MPa, the tension control stress of the finish-rolled threaded steel bar 1 is 0.85fpk, and the design value P of the tension of the prestressed finish-rolled threaded steel bar 1 is 536.6 kN. In the test, the screwing torque T1 of the 1 st finish-rolled twisted steel bar 1 is 2489.8N.m, and the torque coefficient K1 is 0.145; the screwing torque T2 of the 2 nd finish-rolled twisted steel bar 1 is 2404.0n.m, and the torque coefficient K2 is 0.140; the 3 rd finish-rolled twisted steel bar 1 applied torque T3 was 2541.3n.m, and the torque coefficient K3 was 0.148. The average value of the torque coefficient of the connecting pair of the prestressed finish-rolled twisted steel 1 is 0.144, the average torque coefficient is used as the torque coefficient during construction or detection, and then the prestressed finish-rolled twisted steel 1 is subjected to tensioning construction.
The tensioning control torque value of the prestressed finish rolling thread steel bar 1 is calculated according to the T ═ P.K.d, wherein: t is a tensioning control torque of the prestressed finish-rolled twisted steel bar 1 or a tensioning screwing torque (N.m) of the prestressed finish-rolled twisted steel bar 1, P is a tensioning control force of the prestressed finish-rolled twisted steel bar 1 or a designed value of a tensile force of the prestressed finish-rolled twisted steel bar 1 or an actual measured value (kN) of the tensile force of the prestressed finish-rolled twisted steel bar 1, K is a connecting pair torque coefficient of the prestressed finish-rolled twisted steel bar 1, and d is a nominal diameter (mm) of the prestressed finish-rolled twisted steel bar 1.
The tensioning construction of the prestressed finish-rolled threaded steel bar 1 adopts a fastening method, a digital display type electric torque wrench 9 is started to apply a tightening and tensioning end anchorage device 4 during construction, the digital display type electric torque wrench 9 is stopped to rotate until a torque value reaches a tensioning control torque value, and the tensioning construction of the prestressed finish-rolled threaded steel bar 1 is completed.
Example 3 detection of Torque and tensile force of Pre-stressed finish-rolled twisted Steel 1
As shown in fig. 2, unlike embodiment 1, there is no need to install the dynamometer 12. The tension detection of the prestressed finish-rolled twisted steel bar 1 adopts a loose-thread method, and the detection is preferably carried out between 1 hour and 48 hours after the tension construction. Starting a digital display type electric torque wrench 9 to unscrew the tensioning end anchorage device 4 during detection, loosening the instantaneous torque value when the tensioning end anchorage device 4 is loosened to obtain an actually measured torque value of the tensioning force of the prestressed finish-rolled threaded steel bar 1, and then passing the actually measured torque value
Calculating to obtain a measured value of the tension of the prestressed finish-rolled twisted steel bar 1, wherein: t is a tensioning control torque of the prestressed finish-rolled twisted steel bar 1 or a tensioning screwing torque (N.m) of the prestressed finish-rolled twisted steel bar 1, P is a tensioning control force of the prestressed finish-rolled twisted steel bar 1 or a designed value of a tensile force of the prestressed finish-rolled twisted steel bar 1 or an actual measured value (kN) of the tensile force of the prestressed finish-rolled twisted steel bar 1, K is a connecting pair torque coefficient of the prestressed finish-rolled twisted steel bar 1, and d is a nominal diameter (mm) of the prestressed finish-rolled twisted steel bar 1.
The specific calculation process is as follows: the diameter d of the finish-rolled twisted steel bar 1 is 34mm, the design standard stress fpk of the prestressed finish-rolled twisted steel bar 1 is 785MPa, the tension control stress of the finish-rolled twisted steel bar 1 is 0.85fpk, and the design value P of the tension of the prestressed finish-rolled twisted steel bar 1 is 605.8 kN. The average torque coefficient obtained by the prestress finish rolling twisted steel 1 connection auxiliary torque coefficient test is 0.148, the average torque coefficient is obtained according to a calculation formula T which is PKd, and the tensioning control torque T of the prestress finish rolling twisted steel 1 during construction is 3048.4 N.m.
According to the calculation formula P ═ T/(Kd), the measured torque T is unscrewed by the anchorage device 4 at the tensioning end of the 1 st finish rolling threaded steel bar 1 during detection1Measured tensile force P of 3000.5n.m1596.3 kN; measured torque T is unscrewed to 1 stretch-draw end ground tackle 4 of nth finish rolling twisted steelnMeasured tensile force P of 2998.7n.mn＝595.9kN。
The measured value of the tension of the prestressed finish-rolled twisted steel bar 1 is in the range of 0.9P-1.1P (or 0.9T-1.1T); and (5) timely supplementing tension to a design value when tension is actually measured to be insufficient. The digital display type electric torque wrench 9 for construction and detection has a relative error of 3% in indication value, has a peak value holding function and can rotate forward and backward.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (10)
1. Concrete bridge prestressing force finish rolling twisted steel tension force torque detecting system, its characterized in that: the device comprises finish-rolled twisted steel, a corrugated pipe, a tensioning end anchor backing plate, a fixed end anchor backing plate, a sleeve and a digital display type electric torque wrench;
the tensioning end anchor backing plate and the fixed end anchor backing plate are arranged in the concrete bridge web plate in an up-down parallel manner;
the finish-rolled twisted steel sequentially penetrates through the tensioning end anchor backing plate and the fixed end anchor backing plate, wherein the upper end of the finish-rolled twisted steel is connected with the tensioning end anchor backing plate through a tensioning end anchorage device, and the lower end of the finish-rolled twisted steel is connected with the fixed end anchor backing plate through a fixed end anchorage device;
the corrugated pipe is sleeved on the finish-rolled twisted steel, and the corrugated pipe is positioned between the tensioning end anchor backing plate and the fixed end anchor backing plate;
the sleeve is arranged on the tensioning end anchorage device;
the digital display type electric torque wrench is sleeved on the sleeve and is connected with a torque wrench reaction force arm.
2. The system for detecting the tension and torque of the pre-stressed finish-rolled threaded steel bar of the concrete bridge according to claim 1, wherein the system comprises: still include portable power, portable power and digital display formula electric torque wrench electric connection.
3. The system for detecting the tension and torque of the pre-stressed finish-rolled threaded steel bar of the concrete bridge according to claim 1, wherein the system comprises: the device also comprises an axial force meter, wherein the axial force meter is arranged between the fixed end anchorage device and the fixed end anchorage backing plate.
4. The system for detecting the tension and torque of the pre-stressed finish-rolled threaded steel bar of the concrete bridge according to claim 1, wherein the system comprises: the corrugated pipe is sleeved with spiral ribs.
5. The system for detecting the tension and torque of the pre-stressed finish-rolled threaded steel bar of the concrete bridge according to claim 1, wherein the system comprises: the tensioning end anchorage device and the fixed end anchorage device are both nuts.
6. The method for detecting the tension torque of the prestressed finish-rolled threaded steel bar of the concrete bridge is characterized by comprising the following steps of: the method comprises the following steps:
s1, selecting a plurality of finish-rolled threaded steel bars to carry out detection tests and passing
Calculating the torque coefficient of the prestressed finish rolling threaded steel bar connecting pair, and finally obtaining the average of the torque coefficient of the finish rolling threaded steel bar connecting pairMean value;
s2, calculating to obtain a tension control torque value of the prestressed finish rolling twisted steel through the T-PKd;
s3, performing tensioning construction on the prestressed finish rolling threaded steel bars through the tensioning control torque value obtained in the S2;
and S4, detecting the torque and the tensile force of the prestress finish rolling threaded steel bar.
7. The method for detecting the tension torque of the pre-stressed finish-rolled threaded steel bar of the concrete bridge according to claim 6, wherein the method comprises the following steps: s1 the detection test specifically comprises the following steps: and screwing the tension end anchorage device through the digital display type electric torque wrench until the axial force meter reaches the tension force design value of the finish rolling threaded steel bar, and recording the numerical values of the axial force meter and the digital display type electric torque wrench at the moment.
8. The method for detecting the tension torque of the pre-stressed finish-rolled threaded steel bar of the concrete bridge according to claim 6, wherein the method comprises the following steps: s3, the construction method specifically comprises the following steps: and screwing the tensioning end anchorage device through the digital display type electric torque wrench, and stopping the digital display type electric torque wrench from rotating until the torque value reaches the tensioning control torque value.
9. The method for detecting the tension torque of the pre-stressed finish-rolled threaded steel bar of the concrete bridge according to claim 6, wherein the method comprises the following steps: s4, the detection comprises the following specific steps: loosening the anchorage at the tensioning end by a digital display type electric torque wrench, taking the instantaneous torque value as the actual measurement torque value of the tension force of the prestressed finish-rolled threaded steel bar when the anchorage at the tensioning end is loosened, and then passing the actual measurement torque value
And calculating to obtain the measured tension of the pre-stressed finish-rolled twisted steel.
10. The method for detecting the tension torque of the pre-stressed finish-rolled threaded steel bar of the concrete bridge according to claim 6, wherein the method comprises the following steps: the interval between S3 and S4 is 1-48 hours.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113945449A (en) * | 2021-11-15 | 2022-01-18 | 西安建筑科技大学 | Experimental device for plate type tension member load reinforcement and installation method thereof |
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| CN101419104A (en) * | 2008-11-28 | 2009-04-29 | 湖南科技大学 | Detecting based on concrete box beam bridge web vertical pre-stress rib stretching force |
| CN101864845A (en) * | 2010-06-22 | 2010-10-20 | 湖南科技大学 | Intelligent anchoring system for prestressed steel rods monitoring the dynamics of prestressed force in reinforcement projects |
| CN104912192A (en) * | 2015-06-08 | 2015-09-16 | 浙江精工钢结构集团有限公司 | Steel tie rod assembly and steel tie rod tensioning construction method |
| CN110438903A (en) * | 2019-07-30 | 2019-11-12 | 中铁十二局集团有限公司 | Vertical prestressing spiral stretch-draw construction method and quality determining method |
| CN217156074U (en) * | 2021-06-22 | 2022-08-09 | 广东和立土木工程有限公司 | Concrete bridge prestressing finish rolling twisted steel tension force torque detecting system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113945449A (en) * | 2021-11-15 | 2022-01-18 | 西安建筑科技大学 | Experimental device for plate type tension member load reinforcement and installation method thereof |
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