CN209460091U - A kind of device hammering prepressing type test cartridge connection structure compactness of grouting - Google Patents

Abstract

The utility model discloses a device for testing the grouting compactness of a sleeve connecting structure with a hammering preloading type, which belongs to the field of testing methods and equipment. The bottom of the external steel structure preloaded component is fixed on the wall where the steel bar sleeve connection structure to be tested is located; a through hole is opened on the cover of the external steel structure preloaded component, and a nut is fixed at the position of the through hole; The dowel is a rigid rod, and the middle part of the rod is tapped externally. The dowel passes through the through hole on the cover and is screwed into the nut. The thread on the rod and the nut form a driving force transmission. The screw thread fits the rod moving up and down; the bottom of the dowel rod is tightly supported on the grouting entity of the steel sleeve connection structure to be detected; the dynamic signal acquisition sensor is attached to the dowel rod; the dynamometer is used to knock Hit the end of the dowel bar. The device is used to realize the on-site connection quality inspection of the prefabricated structural reinforcement sleeve, and to complete the quantitative analysis of the grouting density in the sleeve.

Description

A device for testing the grouting compactness of a sleeve connection structure by hammering preloading

technical field

The utility model belongs to the field of testing of assembled building structures, in particular to a device for testing the grouting compactness of a sleeve connecting structure by hammering and preloading.

Background technique

As an emerging green, environmentally friendly and energy-saving building method, the prefabricated building structure has many advantages and has attracted extensive attention from relevant personnel at home and abroad, representing the direction of technological progress in the construction industry. The quality control of the on-site connection of prefabricated components is very important to ensure the safe and normal use of prefabricated buildings, but there is still a lack of effective detection methods in the project, so it is urgent to research and develop methods for the detection and evaluation of the on-site connection quality of prefabricated structures Quality control during and after construction.

The on-site splicing of prefabricated components is often connected by steel sleeve joints, and once there is a problem with these connection structures, a major safety accident will occur, and the consequences will be disastrous. For the connection of reinforced sleeve joints, the quality of the connection depends on whether the grouting in the sleeve is dense. Therefore, there is a need for a reasonable and reliable quantitative detection method for the grouting density of steel sleeves to detect the connection quality of key nodes of prefabricated buildings, so as to avoid safety accidents.

Contents of the invention

The purpose of the utility model is to solve the defect that the quantitative detection of the grouting density of the steel sleeve is difficult in the prior art, and to provide a hammer preloading device for testing the grouting density of the sleeve connection structure, so as to complete the assembly process. Qualitative or quantitative detection and control of the on-site connection quality of modular structures, providing guarantee for the safe and normal use of prefabricated buildings.

The technical scheme that the utility model specifically adopts is as follows:

A hammering preloading device for testing the grouting density of a sleeve connection structure, which includes an external steel structure preloading member, a nut, a dowel, a force hammer, and a dynamic signal acquisition sensor; the external steel structure preloading The compression member is a cover-shaped hollow steel member, and its bottom is fixed on the wall where the steel bar sleeve connection structure to be tested is located; a through hole is set on the cover of the external steel structure pre-compression member, and the position of the through hole is fixed. A nut; the dowel rod is a rigid rod body, and the middle part of the rod body is tapped, and the dowel rod is screwed into the nut after passing through the through hole on the cover body. The nut constitutes a screw fit for driving the dowel to move up and down; the bottom of the dowel is tightly supported on the grouting entity of the connection structure of the steel bar sleeve to be detected; the dynamic signal acquisition sensor is attached to the dowel; A dynamometer is used to strike the end of the dowel bar.

As a preference, in the connection structure of the steel bar sleeve to be tested, the overflow hole and the grouting hole on the outer wall of the sleeve are exposed on the wall surface; the bottom of the dowel bar passes through the overflow hole or the grouting hole After the hole, it enters the inside of the sleeve and is supported on the grouted concrete.

As a preference, in the connection structure of the steel bar sleeve to be detected, neither the overflow hole nor the grouting hole on the outer wall of the sleeve is exposed on the wall surface; a drill hole is drilled from the wall surface toward the outer wall of the sleeve, The bottom of the dowel bar is supported on the outer wall surface of the sleeve after passing through the borehole.

Preferably, the dynamic signal acquisition sensor is a strain gauge, and the strain gauge is connected with a supporting data acquisition system.

Preferably, the bottom of the external steel structure pre-compression member is connected and fixed to the surface of the wall through a bending plane.

As a preference, the bottom of the external steel structure pre-compression member is bonded and fixed to the surface of the wall.

The beneficial effects of the utility model are as follows:

1. The dynamic testing device and method for detecting the grouting density of the steel sleeve connection structure by preloading and hammering according to the present utility model can be used to determine the density of the steel sleeve joint connection after the grouting is completed. For prefabricated buildings The on-site connection node quality inspection has great practical value;

2. Through the indoor full-scale model test, grouting according to the pre-determined density gradient, a comparison experiment of multiple gradients is obtained, and the dynamic signal change curve with time of different grouting density is measured, and then compared with the field measured curve In contrast, the influence of uncertain parameters in this method is small, and the measured grouting compactness is more accurate.

3. The test device can be reused, which can effectively reduce the test cost and improve the quality of key nodes.

Description of drawings

Figure 1 Schematic diagram of the dynamic testing device for hammering preloading test of the grouting compactness of the sleeve connection structure;

The installation state schematic diagram (case one) of Fig. 2 dynamic test device;

The installation state schematic diagram (case two) of Fig. 3 dynamic test device;

In the figure: wall body A, grout overflow hole B, external steel structure preloaded component C, fixed nut D, force transmission rod E, dynamic signal acquisition sensor G, grouting hole H, first steel bar J, sleeve outer wall K, Grouting concrete L, second steel bar M, drill hole N.

Detailed ways

Below in conjunction with accompanying drawing and implementation steps, the utility model is further described.

The utility model is suitable for the detection of the grouting density of the sleeve connection structure. In the common sleeve connection structure, the connection between the first steel bar J and the second steel bar M is generally performed through the connecting sleeve, and the outer wall K of the sleeve Injected with grouted concrete L. After the sleeve connection structure is grouted, there may be a problem of insufficient grouting density in the sleeve, so that the tensile bearing capacity is lower than the design value, which affects the safe and normal use of the sleeve connection structure. Therefore, in this utility model, the external steel structure preloading member C is installed in place and applies a suitable preload to the dowel F through the fixing nut D so that it is in direct or indirect close contact with the grouting concrete L. The dowel E exerts a hammering force, the dynamic signal is collected by the dynamic signal acquisition sensor G and the connected data acquisition instrument, and compared with the dynamic signal obtained from the indoor model test, the actual grouting density in the sleeve can be obtained .

As shown in Figures 1 and 2, it is a structural schematic diagram of a dynamic test device for testing the grouting compactness of the connection structure of the sleeve by hammering preloading of the present invention. The device includes an external steel structure pre-compression component C, a nut D, a dowel E, a force measuring hammer F, and a dynamic signal acquisition sensor G. Among them, the external steel structure pre-compression member C is a cover-shaped hollow steel member, which can be pressed by steel plates to form a bottomless cylinder or square cylinder, and the bottom of the cylinder is bent to form a ring-shaped plane, making it It can be attached to the surface of wall A, and connected and fixed with the wall by adhesive or other fixing parts. A through hole is opened on the cover body of the external steel preloaded component C, and a nut D is fixed on the inner surface of the cover at the position of the through hole. The dowel E is a rigid rod body, which can be made of steel, and the middle part of the rod body is tapped externally. The dowel E is screwed into the nut D after passing through the through hole on the cover body, and the thread on the rod body and the nut D form a screw thread that drives the dowel E to move up and down. In actual use, the position of the bottom of the dowel E can be adjusted up and down by rotating it to adapt to different wall surface heights, so that the bottom of the dowel E can be tightly supported on the grouting of the steel sleeve connection structure to be tested Physically. Under different grouting compactness, the dynamic signal that can be detected by hammering the dowel E will also be different, and has an obvious correlation with the grouting compactness, so the dynamic signal can be detected by the dynamic signal acquisition sensor G , and then used to quantitatively estimate the grouting density of the steel sleeve connection structure. In the utility model, the dynamic signal acquisition sensor G is attached to the dowel E, and the end of the dowel E is struck by a force measuring hammer F. The dynamic signal acquisition sensor G can be selected according to the needs, as long as the signal can reflect the grouting density of the steel sleeve connection structure. The dynamic signal acquisition sensor G also needs to be matched with the data acquisition system. In this embodiment, the dynamic signal acquisition sensor G uses strain gages, and the strain gages need to be connected to the KD5018 integral charge amplifier and the KD-LP16D data collector to collect the time-varying curve of the dynamic signal that can reflect the grouting compactness.

As shown in Figure 2, it is a schematic diagram of the installation of the dynamic testing device on a sleeve connection structure. In the steel bar sleeve connection structure to be tested, the grout overflow hole B and the grout injection hole H on the outer wall K of the sleeve are both exposed on the surface of the wall A. Therefore, the bottom of the dowel rod E can directly pass through the overflow hole B or the grouting hole H and then enter the inside of the sleeve. The external steel structure preloaded component C is fixed on the surface of the wall A by bolt connection or pasting, and makes the force transmission The rod F is in close contact with the surface of the grouted concrete L or the first steel bar J, and then a preload is applied to the dowel F through the fixing nut D, so that the dowel F and the surface of the grouted concrete L will not be separated during the test.

As shown in Figure 3, it is a schematic diagram of the installation of the dynamic testing device on another sleeve connection structure. In the steel sleeve connection structure to be tested, neither the overflow hole B nor the grouting hole H on the outer wall K of the sleeve is exposed on the surface of the wall A, so the bottom of the dowel E cannot directly pass through the overflow hole B Or enter the inside of the sleeve after the grouting hole H. At this time, it is necessary to use a jackhammer to drill a hole N from the surface of the wall A to the outer wall K of the sleeve, and then install the external steel structure preloaded component C on the wall A by the above method, and put the bottom of the dowel E through After passing through the drilling hole N, it is supported on the surface of the outer wall K of the sleeve, so that it is in close contact with the outer wall K of the sleeve to ensure that it will not be separated during the test.

Based on the above-mentioned dynamic test device, a method for testing the grouting compactness of the sleeve connection structure by hammering preloading can also be provided, and the steps are as follows:

Step 1. When testing the grouting density of the reinforcement sleeve, extend the force transmission rod E attached with the dynamic signal acquisition sensor G into the wall A at the position of the overflow hole B and the grouting hole H on the outer wall K of the sleeve inside, making it in contact with the grouting entity to be detected. When the grouting hole B and the grouting hole H are exposed, the grouting entity can directly select the steel bar or concrete in the sleeve; when the grouting hole B and the grouting hole H are not exposed, the grouting entity can choose the sleeve itself. Then, the bottom of the external steel structure preloaded member C is bonded and fixed to the surface of the wall body A through an adhesive.

Step 2. Rotate and tighten the dowel rod E through the nut D fixed inside the device, so that the bottom of the dowel rod E is tightly supported on the grouting entity of the steel sleeve connection structure to be tested, so as to ensure that the two do not differ during the test. will separate.

Step 3, using the force measuring hammer F to tap the end of the dowel bar E, and collecting the change curve of the dynamic signal over time through the data acquisition system connected with the dynamic signal acquisition sensor G;

Step 4: Carry out indoor full-scale model test, and the full-scale model is completely consistent with the steel sleeve connection structure to be tested. For the full-scale model, several groups of gradient grouting with different densities are set up for comparative tests, which can be divided into multiple gradients such as no grouting, 1/3 saturated grouting, 2/3 saturated grouting, and fully saturated grouting. Under the same hammering force as in step 3, use the same dynamic testing device to measure the time-varying curve of the dynamic signal of different grouting compactness, and compare it with the time-varying curve of the dynamic signal measured on-site in step 3, so that Determine the interval of the actual grouting density, and complete the quantitative judgment of the grouting density of the steel sleeve. Generally speaking, there is a positive correlation between the signal of the strain gauge response and the density of grouting. Therefore, the measured dynamic signal can be compared with the test data of different grouting densities, and the interval of the measured data can be selected to determine the actual grouting. The range of density.

Step 5. After the test is completed, disassemble the device and clean it up for the next use.

The above-mentioned embodiment is only a preferred solution of the present utility model, but it is not intended to limit the present utility model. Various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention. Therefore, all technical solutions obtained by means of equivalent replacement or equivalent transformation fall within the protection scope of the present utility model.

Claims (6)

1. A device for testing the grouting compactness of a sleeve connection structure by hammering preloading, characterized in that it includes an external steel structure preloading member (C), a nut (D), a dowel bar (E), a force measuring Hammer (F), dynamic signal acquisition sensor (G); said external steel structure preloading member (C) is a cover-shaped hollow steel member, and its bottom is fixed on the wall where the steel bar sleeve connection structure to be detected is located. body (A); a through hole is set on the cover of the external steel structure preloaded component (C), and a nut (D) is fixed at the position of the through hole; the dowel rod (E) is a rigid rod body, And the middle part of the rod body is tapped externally, the force transmission rod (E) is screwed into the nut (D) after passing through the through hole on the cover body, and the thread on the rod body and the nut (D) form a driving force transmission The threaded fit of the rod (E) moving up and down; the bottom of the force transmission rod (E) is tightly supported on the grouting entity of the steel bar sleeve connection structure to be detected; the dynamic signal acquisition sensor (G) is attached to the force transmission on the rod (E); the force hammer (F) is used to strike the end of the dowel rod (E). 2. The device as claimed in claim 1, characterized in that, in the connection structure of the steel bar sleeve to be detected, the overflow hole (B) and the grouting hole (H) on the outer wall of the sleeve (K) are both Exposed on the surface of the wall (A); the bottom of the dowel (E) passes through the overflow hole (B) or the grouting hole (H) and then enters the sleeve, and is supported on the grouted concrete (L) . 3. The device as claimed in claim 1, characterized in that, in the connection structure of the steel bar sleeve to be detected, the overflow hole (B) and the grouting hole (H) on the outer wall of the sleeve (K) are both Not exposed on the surface of the wall (A); a hole (N) is drilled from the surface of the wall (A) toward the outer wall (K) of the sleeve, and the bottom of the dowel (E) passes through the hole (N) The rear support is on the surface of the outer wall (K) of the sleeve. 4. The device according to claim 1, characterized in that the dynamic signal acquisition sensor is a strain gauge, and the strain gauge is connected with a supporting data acquisition system. 5. The device according to claim 1, characterized in that, the bottom of the external steel structure pre-compression member (C) is connected and fixed to the surface of the wall (A) through a bending plane. 6. The device according to claim 1, characterized in that, the bottom of the external steel structure pre-compression member (C) is bonded and fixed to the surface of the wall (A).