Detection track in cavity of prefabricated superposed shear wall

Abstract

The utility model discloses a detection track in a cavity of a prefabricated superposed shear wall, which comprises a first mounting frame and a second mounting frame which are oppositely arranged, and at least three fixing plates are vertically arranged on the corresponding surfaces of the first mounting frame and the second mounting frame. The at least three fixing plates are arranged in parallel, locking screws are arranged on the two fixing plates located on the outer side, a hand-cranking device is arranged on the surface of the other side of the first mounting frame, two steel wire ropes are arranged in the hand-cranking device, one end of each steel wire rope extends out of the hand-cranking device and is connected with a limiting head, and the other end of each steel wire rope extends out of the limiting head. An avoiding through hole is formed in the first mounting frame corresponding to the steel wire rope, a limiting through hole is formed in the second mounting frame corresponding to the steel wire rope, and the steel wire rope penetrates through the avoiding through hole and the limiting through hole and then is matched with the second mounting frame for limiting through a limiting head. The device can be quickly built on a detection site, has universality for different wall body widths, and can enable a collection vehicle to run stably.

Description

Technical Field

[0001] This utility model relates to the field of prefabricated building inspection technology, specifically to an inspection track inside the cavity of a prefabricated composite shear wall. Background Technology

[0002] In recent years, the national requirements for the assembly rate of prefabricated concrete structures have been continuously increasing. Therefore, in addition to the "three-panel" (precast concrete, precast concrete, and precast concrete), vertical load-bearing precast components are required, and precast shear walls have become the mainstay. Among them, precast composite shear walls, as a new type of component, are composed of two concrete wall panels stacked together, with a cavity between the panels. After on-site installation, concrete is poured into the cavity to form a whole, also known as a "double-skin wall." Compared with ordinary precast shear walls, they have advantages such as convenient vertical reinforcement connection, good integrity, and easy control of on-site construction quality. However, existing research has shown that the quality of the interface between the old and new concrete in precast composite shear walls is a key factor affecting the overall shear resistance and seismic performance. Currently, ultrasonic testing and core drilling methods can be used to detect defects in the interface, and these methods are relatively convenient. When the test results show no obvious quality defects in the interface, there is indeed no problem. However, when the test results show obvious defects in the interface, it is very difficult to demolish and rework or reinforce the already formed wall. Therefore, this method of post-event detection has obvious drawbacks.

[0003] Extensive research on the quality defects of the bonding surface between new and old concrete in precast composite shear walls has revealed that the roughness of the old concrete surface at the bonding surface is a key factor affecting the quality of the subsequent bonding. The greater the roughness at the bonding surface, the better the bonding quality after the new and old concrete are bonded. Therefore, the roughness of the two inner surfaces of the precast composite shear wall can be tested before pouring concrete, and only those that pass the test can be used on the construction site.

[0004] Precast composite floor slabs, composite beams, etc., have specific requirements for surface roughness testing. According to different roughness information collection principles, the testing methods mainly include "filling method", "depth ruler method" and "three-dimensional scanning method". When conducting roughness testing on precast composite shear walls, the following two factors need to be considered: (1) Precast composite shear walls are composed of two precast wall panels combined by truss reinforcement. The two precast wall panels form an inner cavity that needs to be poured later. The width of the inner cavity, i.e. the distance between the two precast wall panels, is usually only 100mm; (2) Precast composite shear walls are placed vertically in the component storage area. The interface between the new and old concrete inside the precast composite shear wall is a vertical surface.

[0005] The applicability of the "filling method," "depth gauge method," and "3D scanning method" in roughness testing of precast composite shear walls is analyzed below. For the "filling method," the main filling methods include sand filling, sawdust filling, iron beads filling, and clay filling. This method requires the mating surfaces to be horizontal, therefore it is not suitable for precast composite shear walls. For the "depth gauge method," the depth gauge is mainly used for direct measurement or in conjunction with a porous reference plate. Although this method can be applied to vertical mating surfaces, the depth gauge is nearly 100 mm long, requiring more than 100 mm of space when holding it by hand. The distance between the two precast wall panels is insufficient for testing, and the hand is too short to reach the middle of the wall for inspection. Therefore, the depth gauge method is not suitable for precast composite shear walls. The "3D scanning method" is currently the most advanced means of collecting roughness information of precast composite floor slabs. The advantages of this method are fast on-site data acquisition and high measurement accuracy. Although the joint surfaces of precast composite shear walls and precast composite floor slabs are very similar in terms of concave and convex shapes, the joint surfaces of precast composite floor slabs are unobstructed from above, allowing 3D laser scanners to freely scan and collect information. However, the distance between the two opposite joint surfaces inside the cavity of a precast composite shear wall is only 100 mm, which cannot accommodate 3D laser scanning equipment. Therefore, the 3D scanning method is not applicable to precast composite shear walls.

[0006] Based on existing roughness detection methods, our research team has proposed a "Surface Roughness Acquisition Method for Prefabricated Composite Shear Walls Based on a Measuring Endoscope," patent application number 202310918238.1, leveraging the shape characteristics of prefabricated composite shear walls and the dimensional measurement capabilities and small-diameter advantages of 3D measuring endoscopes. This method involves fixing a light steel slide rail at the height of the detection position within the cavity of the prefabricated composite shear wall. A data acquisition cart, capable of reciprocating along the length of the slide rail, is mounted on the light steel slide rail. The endoscope probe is fixed to the data acquisition cart. Using the data acquisition cart and the light steel slide rail, the probe is inserted into the cavity of the prefabricated composite shear wall. A measuring lens mounted on the probe performs static imaging and single-line measurement of the grooves on the rough surface. After measurement, the data acquisition cart is moved again to perform static imaging and single-line measurement of other grooves on the rough surface. This method utilizes a 3D measuring endoscope to acquire roughness information, providing intuitive images and enabling precise measurement of individual grooves with high detection accuracy.

[0007] The prerequisite for implementing the above roughness testing method is to quickly construct a "test track" within the cavity of the precast composite shear wall at the testing site. Only then can the endoscope probe be inserted into the cavity of the precast composite shear wall using a data acquisition vehicle and the "test track" for testing. The "test track" is constructed along the width of the precast composite shear wall, so its length is primarily determined by the wall width. However, even within the same project, precast composite shear walls come in various widths, and these widths may increase for different projects. Therefore, the applicability of the "test track" to different wall widths must be considered first. Next, the ability to quickly construct the "test track" at the testing site must be considered to ensure testing efficiency. Furthermore, it must be ensured that the data acquisition vehicle carrying the endoscope probe can move smoothly along the test track without any uncontrolled rotation during the testing process, ensuring that the endoscope probe's lens is always directly facing the rough surface.

[0008] Therefore, it is necessary to develop a "test track" that can be quickly erected in the cavity of a precast composite shear wall. Summary of the Invention

[0009] The technical problem to be solved by this utility model is to provide a detection track inside the cavity of a prefabricated composite shear wall, which can be quickly set up on the detection site, is universal for different wall widths, and enables the data collection vehicle to run smoothly.

[0010] To address the aforementioned technical problems, this utility model provides a detection track within the cavity of a precast composite shear wall, comprising two opposing first and second mounting frames. At least three fixing plates are vertically arranged on corresponding surfaces of both the first and second mounting frames. These fixing plates are arranged in parallel, with locking screws on the two outermost fixing plates. A hand crank is mounted on the other side of the first mounting frame, containing two steel wire ropes. One end of each steel wire rope extends from the hand crank and connects to a limiting head. An clearance through-hole is provided on the first mounting frame corresponding to the steel wire rope, and a limiting through-hole is provided on the second mounting frame corresponding to the steel wire rope. The steel wire rope passes through the clearance through-hole and the limiting through-hole and is then limited by the limiting head in conjunction with the second mounting frame.

[0011] Furthermore, a mounting plate is vertically disposed on the surface of the first mounting bracket, and the hand crank is fixedly disposed on the mounting plate.

[0012] Furthermore, both the first mounting bracket and the second mounting bracket are made of steel.

[0013] Furthermore, the locking screw has a hand-screw end, and the fixing plate corresponding to the locking screw has a reinforcing threaded protrusion.

[0014] Furthermore, a laser emitter is provided on the first or second mounting bracket.

[0015] Furthermore, the surface of the fixing plate is set to a rough surface.

[0016] Furthermore, the number of fixing plates is four.

[0017] Furthermore, the limiting through hole is a gourd-shaped hole.

[0018] The beneficial effects of this utility model are:

[0019] 1. The system cleverly utilizes flexible steel wire as the main material of the "detection track". It is lightweight and easy to store and carry. The extension length of the steel wire can be adjusted according to the width of different walls. After adjusting to the appropriate length, the steel wire is tightened by a hand-cranked steel wire winding device. Under the action of pre-tensioning force, the steel wire changes from its original complete flexibility to a certain degree of rigidity, thereby meeting the requirements for setting up the data collection vehicle.

[0020] 2. The “testing track” can be set up quickly. Only one end of the wall needs to be installed with a mounting bracket with a limit hole as a fixed end. Then, one end of the steel wire is connected and fixed to the mounting bracket with the limit hole through the limit head. The steel wire can be extended and tightened by hand. It is fast and efficient.

[0021] 3. This invention uses two parallel steel wires that are adjacent to each other as the "detection track". This allows the collection vehicle to have freedom only in the length direction of the track. The collection vehicle will not rotate without human control during the movement, thus ensuring that the endoscope probe's imaging lens is always facing the rough surface. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the first mounting bracket part of this utility model;

[0024] Figure 3 This is a schematic diagram of the second mounting bracket part of this utility model;

[0025] Figure 4 This is a top view of the structure of this utility model during installation. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0027] Reference Figures 1 to 4As shown, one embodiment of the detection track inside the cavity of the precast composite shear wall of this utility model includes two opposing first mounting brackets 1 and second mounting brackets 2. Three or four fixing plates 3 are vertically arranged on the corresponding surfaces of the first mounting brackets and the second mounting brackets. The fixing plates are arranged in parallel, and locking screws 4 are provided on the two fixing plates located on the outer side. A hand crank 5 is provided on the other side surface of the first mounting bracket. Two steel wire ropes 6 are provided in the hand crank. One end of the steel wire rope extends out of the hand crank and is connected to a limiting head 7. An avoidance through hole 8 is provided on the first mounting bracket corresponding to the steel wire rope, and a limiting through hole 9 is provided on the second mounting bracket corresponding to the steel wire rope. After the steel wire rope passes through the avoidance through hole and the limiting through hole, it is limited by the limiting head and cooperates with the second mounting bracket.

[0028] The distance between the two limiting through holes is consistent with the distance between the outlet positions of the two steel wire ropes in the hand crank, so that after the two steel wire ropes are tightened and fixed, they can form a parallel effect.

[0029] In use, the first and second mounting brackets are first installed on the two sides of the precast composite shear wall, respectively, and arranged symmetrically. When there are three fixing plates, two of the fixing plates cooperate to clamp the first wall 112 on one side of the precast composite shear wall, that is, the fixing plate located on the inner side abuts against the inner surface of the wall on that side. The other fixing plate is clamped against the first wall by locking screws to achieve clamping and fixing. The third fixing plate is based on the clamping and fixing as a non-moving and force-bearing foundation. It is extended by rotating the corresponding locking screws to abut against and tighten against the second wall 111, thereby achieving a bidirectional fixing effect. The design of four fixing plates can also be fixed by the cooperation of three fixing plates. During operation, since the fixing is formed by extrusion pressure, if one of the two fixing plates located on the inner side is damaged or broken, the other can still effectively cooperate to fix it.

[0030] After the first mounting bracket is fixed, the second mounting bracket is fixed in the same way. The first and second mounting brackets are at the same height. Then, one steel wire rope in the hand crank is pulled out, and the end of the steel wire rope is sent from the end of the hand crank to the end of the second mounting bracket along the space between the first and second walls using the auxiliary pushing rod. Then, the limiting head at the end of the steel wire rope is passed through the limiting through hole, making it impossible for the limiting head to pass through the limiting through hole. At this time, the hand crank is operated to tighten the steel wire rope. The tightened steel wire rope is in a taut state and has good rigidity. The second steel wire rope is also fixed in the same way. After fixing, two rigid steel wire ropes are formed. The two steel wire ropes can cooperate to form a "detection track" for the data collection vehicle to slide freely.

[0031] To facilitate the determination of the extension position of the steel wire rope in the hand crank, a mounting plate 10 is vertically installed on the surface of the first mounting frame. The hand crank is fixedly mounted on the mounting plate to ensure that the extension position of the steel wire rope of the hand crank faces directly towards the second mounting bracket. The hand crank is based on the hand crank of a clothes rack. It can extend two steel wires and tighten the steel wires when retracting. The internal structure of the hand crank is not described in detail.

[0032] To facilitate the installation of the wire rope, both the first and second mounting frames are made of steel, which has good strength and toughness, good stability in use, and is not easily damaged by impacts.

[0033] The aforementioned locking screw has a hand-screw end 11 for easy hand-screwing operation. The corresponding fixing plate has a reinforcing threaded protrusion to ensure stability during contact. The surface of the fixing plate is roughened, which provides greater frictional resistance after contact with the first or second wall, thus preventing slippage along the surface of the precast composite shear wall during operation and ensuring positional accuracy.

[0034] The aforementioned limiting through hole is a gourd hole. A steel wire rope with a limiting head passes through the large end and moves downward into the small end, so that the limiting head cannot pass through the small end, thus achieving the limiting purpose. The small end of the gourd hole is located below the large end.

[0035] In one embodiment, a laser emitter 13 is provided on the first or second mounting bracket. Because the cavity of the prefabricated composite shear wall is narrow, the internal field of vision is poor. When installing the second mounting bracket, it is necessary to measure the height with a ruler to locate the relative position of the second mounting bracket and the first mounting bracket. When a laser emitter is used, it can emit red, blue or green laser lines to allow the operator to judge the relative position of the two. Based on the laser lines seen in the cavity, the installation position of the second mounting bracket can be quickly located, thereby improving the convenience of operation.

[0036] The above embodiments are merely preferred embodiments provided to fully illustrate the present utility model, and the protection scope of the present utility model is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present utility model are all within the protection scope of the present utility model.

Claims

1. A detection track inside the cavity of a precast composite shear wall, characterized in that, The device includes two opposing first and second mounting brackets. At least three fixing plates are vertically arranged on corresponding surfaces of both the first and second mounting brackets. These fixing plates are arranged parallel to each other, with locking screws on the two outermost fixing plates. A hand crank is located on the other side of the first mounting bracket. Two steel wire ropes are installed inside the hand crank, with one end extending out of the hand crank and connected to a limiting head. An clearance through-hole is provided on the first mounting bracket corresponding to the steel wire rope, and a limiting through-hole is provided on the second mounting bracket corresponding to the steel wire rope. The steel wire rope passes through the clearance through-hole and the limiting through-hole and then engages with the second mounting bracket through the limiting head for limiting.

2. The detection track inside the cavity of the precast composite shear wall as described in claim 1, characterized in that, The first mounting bracket has a mounting plate vertically mounted on its surface, and the hand crank is fixedly mounted on the mounting plate.

3. The detection track inside the cavity of the precast composite shear wall as described in claim 1, characterized in that, Both the first mounting bracket and the second mounting bracket are made of steel.

4. The detection track inside the cavity of the precast composite shear wall as described in claim 1, characterized in that, The locking screw has a hand-screw end, and the fixing plate corresponding to the locking screw has a reinforcing threaded protrusion.

5. The detection track inside the cavity of the precast composite shear wall as described in claim 1, characterized in that, A laser emitter is provided on the first or second mounting bracket.

6. The detection track inside the cavity of the precast composite shear wall as described in claim 1, characterized in that, The surface of the fixing plate is set to a rough surface.

7. The detection track inside the cavity of the precast composite shear wall as described in claim 1, characterized in that, The number of fixing plates is 4.

8. The detection track inside the cavity of the precast composite shear wall as described in claim 1, characterized in that, The limiting through hole is a gourd-shaped hole.

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