A concrete strength detection device for building construction

Abstract

The present invention discloses a concrete strength detection device for building construction, belonging to the technical field of concrete strength detection. A concrete strength detection device for building construction includes a support assembly. The support assembly includes a support frame. A top plate is provided on the support frame. The four corners of the support frame are connected to the top plate through columns. An abutting ring groove is provided on the support frame. A protective frame that is slidably arranged on the column and abuts against the abutting ring groove is provided on the column. A positioning assembly for fixing the concrete specimen is provided between the support frame and the protective frame. A lifting plate located inside the protective frame is slidably arranged on the column. A pressure sensor is provided on one side of the lifting plate close to the support frame. A hydraulic cylinder connected to the top plate is arranged on the other side of the lifting plate. An active connection assembly is provided between the protective frame and the lifting plate, which has the advantages of automatic centering and positioning, safety protection, flexible linkage, stable pressure application, effective detection, reliable structure and convenient operation.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete strength detection, and particularly to a concrete strength detection device for building construction. Background Art

[0002] As one of the core materials of modern buildings, concrete plays an irreplaceable role in building construction. Concrete is widely used in various key parts of building construction, and its strength grade is closely related to its use. The quality of concrete directly affects the result of the construction project. Therefore, the detection of concrete is essential, and the compressive strength is one of the most important indicators for detecting the quality of concrete, which has an important impact on the durability and safety of the concrete structure.

[0003] During the existing concrete strength detection process, generally, the concrete specimen is positioned through a positioning structure, and then a stable downward pressure is applied on its top by a hydraulic cylinder to achieve the strength detection. However, during the detection process, the concrete may be broken into fragments under the action of the downward pressure, and the broken fragments may fly onto the body of the detection personnel under the action of the pressure, causing scratches or impacts on the body of the detection personnel, reducing the safety of the detection. Moreover, the flying fragments will also scatter in the surrounding environment. Due to the small volume of the fragments, the scattered fragments greatly increase the cleaning difficulty and reduce the efficiency of concrete detection.

[0004] Therefore, it is necessary to provide a concrete strength detection device for building construction to solve the above problems. Summary of the Invention

[0005] Aiming at the deficiencies of the existing technology, the purpose of the embodiment of the present invention is to provide a concrete strength detection device for building construction to solve the problems in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A concrete strength detection device for building construction includes a support assembly. The support assembly includes a support frame. A top plate is provided on the support frame. The four corners of the support frame are connected to the top plate through columns. An abutting ring groove is provided on the support frame. A protective frame that is slidably provided on the column and is in movable abutment with the abutting ring groove is provided on the column. A positioning assembly for fixing the concrete specimen is provided between the support frame and the protective frame. A lifting plate that is slidably provided on the column and is located inside the protective frame is provided on the column. A pressure sensor is provided on one side of the lifting plate close to the support frame. A hydraulic cylinder connected to the top plate is provided on the other side of the lifting plate. An active connection assembly is provided between the protective frame and the lifting plate.

[0008] As a further solution of the present invention, the positioning component includes four guiding frames circumferentially distributed on the inner wall of the protective frame and four groups of movable modules circumferentially distributed on the support frame. The movable modules correspond to the guiding frames one by one. Each movable module includes two sliding grooves, a cross bar is arranged in the sliding grooves, a sliding seat slidably matched with the cross bar is slidably arranged in the sliding grooves, a first spring sleeved outside the cross bar is connected between the sliding grooves and the sliding seat, a vertical plate is installed on the sliding seat, a connecting plate is connected between the two vertical plates, a contact roller is movably arranged on one side of the connecting plate away from the middle of the support frame, a sliding rod is slidably arranged on the vertical plate, a contact plate is connected to one end of the sliding rod close to the middle of the support frame, and a second spring sleeved outside the sliding rod is connected between the contact plate and the vertical plate.

[0009] As a further solution of the present invention, the movable connection component includes a plurality of limiting holes arranged on the column. Two ends of the top of the protective frame are symmetrically provided with guiding cylinders. Guiding grooves are symmetrically arranged at both ends of the guiding cylinders. Limiting rods are symmetrically and slidably arranged in the guiding cylinders. A third spring arranged inside the guiding cylinder is connected between the two ends of the two limiting rods close to each other. The outer ends of the limiting rods are movably matched with the limiting holes. Movable rods slidably matched with the guiding grooves are respectively connected to the ends of the two limiting rods located inside the guiding cylinder and close to each other. J-shaped guiding plates movably matched with the movable rods are symmetrically installed on the lifting plate. The J-shaped guiding plates and the lifting plate are connected through mounting frames.

[0010] As a further solution of the present invention, an observation window is provided on the front surface of the protective frame.

[0011] As a further solution of the present invention, a plurality of chip collecting grooves are provided at the center of the bracket component. A cavity is arranged inside the support frame, and a plurality of horizontal cross plates are horizontally distributed inside the cavity. Drawers are slidably arranged on the cross plates.

[0012] As a further solution of the present invention, the guiding frame is a right trapezoidal frame with an inclined surface facing the middle of the support frame.

[0013] As a further solution of the present invention, the J-shaped guiding plate is composed of an inclined plate and a semi-circular ring.

[0014] As a further solution of the present invention, the length of the guiding groove is the same as the projected length of the J-shaped guiding plate on the horizontal plane.

[0015] As a further solution of the present invention, a plurality of limiting holes are on the same horizontal plane, and the axis of the limiting hole is parallel to the axis of the limiting rod.

[0016] In summary, the embodiments of the present invention have the following beneficial effects compared with the prior art:

[0017] 1. In the present invention, the guiding frame drives the vertical plate to approach the center of the supporting frame by means of the inclined surface being in movable abutment with the abutting roller and the sliding seat being in sliding fit with the sliding groove. The vertical plate drives the abutting plate to approach the middle part of the supporting frame by being connected to the sliding rod and the second spring, so that the abutting plate closely adheres to the outer wall of the concrete specimen. When the bottom of the protective frame is in fit with the abutting ring groove, the guiding frame stops moving downward. At this time, the positions of the sliding seat and the vertical plate are fixed, and the four walls of the concrete specimen can be positioned. At the same time, by being circumferentially distributed on the abutting plate, the non-centered concrete specimen can be pushed to the center of the supporting frame during the positioning process of the concrete specimen, realizing the automatic centering and positioning of the concrete specimen, which is convenient for subsequent strength testing.

[0018] 2. In the present invention, when the movable rod is in a clamped state with the J-shaped guiding plate, the synchronous lifting and lowering of the protective frame and the lifting plate can be realized. The hydraulic cylinder pushes the lifting plate to move downward by means of the sliding fit between the lifting plate and the column. When the limiting rod corresponds to the limiting hole, the third spring elongates and pushes the limiting rod to move outward, realizing the connection between the limiting rods, so that the protective frame is in a positioned state, and the synchronous movement between the protective frame and the lifting plate is released. After the strength test of the concrete specimen is completed, the lifting plate drives the J-shaped guiding plate to move upward synchronously by being connected to the mounting frame, and the movable rod is re-clamped with the semi-circular ring on the J-shaped guiding plate, realizing the re-synchronous movement of the protective frame and the lifting plate, and the protective frame can be synchronously lifted upward, which is convenient for taking out the tested concrete specimen and cleaning the surface of the supporting frame.

[0019] 3. In the present invention, during the process of the protective frame moving downward to be positioned, the automatic centering and positioning of the concrete specimen can be realized, that is, when performing the strength test on the concrete specimen, the tester only needs to first place the concrete specimen to be tested on the supporting frame, and then control the hydraulic cylinder to push the lifting plate to move downward, then the automatic centering and positioning and strength test of the concrete specimen can be realized. There is no need for the tester to perform too many steps, which greatly simplifies the testing steps and can well avoid the problem that the test result is inaccurate due to inaccurate operation steps, improving the testing efficiency and accuracy of the concrete specimen.

[0020] 4. In the present invention, through a plurality of chip collecting grooves, it is convenient to guide the waste chips and dust generated during the strength test of the concrete specimen into the drawer, which helps to centrally process the waste chips and dust. Through the observation window, it is convenient for the tester to observe the progress of the strength test of the concrete specimen in real time, realizing the effective isolation between the concrete specimen and the tester, and improving the safety of the tester.

[0021] To more clearly elaborate the structural features and functions of the present invention, the following will combine the drawings and specific embodiments to elaborate on the present invention in detail. Description of the Drawings

[0022] Figure 1 It is a perspective view of the concrete strength detection device for building construction in the invention embodiment.

[0023] Figure 2 It is a front sectional view of the concrete strength detection device for building construction in the invention embodiment.

[0024] Figure 3 It is a schematic structural view of the support assembly in the invention embodiment.

[0025] Figure 4 It is Figure 3 a partial enlarged view of the position A in

[0026] Figure 5 It is a side sectional view of the concrete strength detection device for building construction in the invention embodiment.

[0027] Figure 6 It is Figure 5 a partial enlarged view of the position B in

[0028] Reference numerals: 1, support assembly; 101, support frame; 102, abutting ring groove; 103, chip collection groove; 104, column; 105, top plate; 106, cavity; 107, cross plate; 108, drawer;

[0029] 2, positioning assembly; 201, sliding groove; 202, cross bar; 203, first spring; 204, sliding seat; 205, vertical plate; 206, connecting plate; 207, abutting roller; 208, sliding rod; 209, abutting plate; 210, second spring; 211, guiding frame;

[0030] 3, protective frame; 301, observation window;

[0031] 4, lifting plate; 401, pressure sensor;

[0032] 5, hydraulic cylinder;

[0033] 6, movable connection assembly; 601, limiting hole; 602, guiding cylinder; 603, guiding groove; 604, limiting rod; 605, movable rod; 606, third spring; 607, J-shaped guiding plate; 608, mounting bracket;

[0034] 7, concrete specimen. Detailed implementation manners

[0035] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0036] The following describes the specific implementation of the present invention in detail with reference to specific embodiments.

[0037] In one embodiment of the present invention, referring to Figures 1 - 3 , a concrete strength detection device for building construction, comprising a bracket assembly 1. The bracket assembly 1 includes a support frame 101, a top plate 105 is provided on the support frame 101, the four corners of the support frame 101 are connected to the top plate 105 through columns 104, an abutting ring groove 102 is provided on the support frame 101, and a protective frame 3 that is slidably provided on the column 104 and abuts against the abutting ring groove 102 is provided on the column 104. A positioning assembly 2 for fixing the concrete specimen 7 is provided between the support frame 101 and the protective frame 3. A lifting plate 4 located inside the protective frame 3 is slidably provided on the column 104. A pressure sensor 401 is provided on one side of the lifting plate 4 close to the support frame 101, and a hydraulic cylinder 5 connected to the top plate 105 is provided on the other side of the lifting plate 4. An active connection assembly 6 is provided between the protective frame 3 and the lifting plate 4.

[0038] In this embodiment, through the positioning assembly 2, the four side walls of the concrete specimen 7 can be abutted to achieve automatic centering and positioning of the concrete specimen 7, avoiding the phenomenon of deviation of the concrete specimen 7 during strength detection, which helps to improve the detection accuracy. Through the cooperation of the protective frame 3 and the abutting ring groove 102, the concrete specimen 7 can be isolated from the external environment, avoiding the problem that the concrete specimen 7 is crushed and ejected during strength detection, resulting in scratches on the detection personnel, improving the safety of the device. At the same time, it is convenient to centrally collect the fragments and dust after the concrete specimen 7 is crushed, avoiding the problem of pollution caused by the fragments and dust entering the surrounding environment. Through the cooperation of the lifting plate 4, the pressure sensor 401 and the hydraulic cylinder 5, the concrete specimen 7 can be stably pressed, facilitating the effective detection of the strength performance of the concrete specimen 7. Through the active connection assembly 6, the orderly downward movement of the protective frame 3 and the lifting plate 4 can be achieved, ensuring that the concrete specimen 7 is in a sealed environment before the strength detection of the concrete specimen 7, avoiding the problem that the protective frame 3 and the abutting ring groove 102 may not be effectively matched during the strength detection of the concrete specimen 7, improving the safety of the detection, and having the effects of automatic centering and positioning, safety protection, flexible linkage, stable pressing, effective detection, reliable structure and convenient operation;

[0039] Among them, several chip collecting grooves 103 are provided at the center of the support assembly 1. A cavity 106 is provided inside the support frame 101. Several cross plates 107 are horizontally distributed inside the cavity 106. A drawer 108 is slidably provided on the cross plate 107. Through the several chip collecting grooves 103, it is convenient to introduce the waste chips and dust generated during the strength detection process of the concrete specimen 7 into the drawer 108, which helps to centrally process the waste chips and dust. An observation window 301 is provided on the front surface of the protection frame 3. Through the observation window 301, it is convenient for the detection personnel to observe the strength detection progress of the concrete specimen 7 in real time, realizing an effective isolation between the concrete specimen 7 and the detection personnel and improving the safety of the detection personnel.

[0040] In an embodiment of the present invention, referring to Figures 1 - 4 , the positioning assembly 2 includes four guiding frames 211 circumferentially distributed on the inner wall of the protection frame 3 and four groups of movable modules circumferentially distributed on the support frame 101. The movable modules correspond to the guiding frames 211 one by one. The movable module includes two sliding grooves 201. A cross bar 202 is arranged in the sliding groove 201. A sliding seat 204 slidably matched with the cross bar 202 is slidably arranged in the sliding groove 201. A first spring 203 sleeved outside the cross bar 202 is connected between the sliding groove 201 and the sliding seat 204. A vertical plate 205 is installed on the sliding seat 204. A connecting plate 206 is connected between the two vertical plates 205. An abutting roller 207 is movably arranged on one side of the connecting plate 206 away from the center of the support frame 101. A sliding rod 208 is slidably arranged on the vertical plate 205. One end of the sliding rod 208 close to the center of the support frame 101 is connected with an abutting plate 209. A second spring 210 sleeved outside the sliding rod 208 is connected between the abutting plate 209 and the vertical plate 205.

[0041] In this embodiment, in the initial state, the protection frame 3 is at the highest point, and the first spring 203 and the second spring 210 are in their original lengths. At this time, the connecting plate 206 is away from the center of the support frame 101, the abutting plate 209 is close to the center of the support frame 101, and the guiding frame 211 is at the highest point;

[0042] When it is necessary to position the concrete specimen 7 placed on the support frame 101, the hydraulic cylinder 5 pushes the lifting plate 4 downward. The lifting plate 4 drives the protective frame 3 to slide downward along the column 104 by being connected to the movable connection assembly 6. After the bottom of the inclined surface of the guide frame 211 contacts the outer wall of the abutting roller 207, the protective frame 3 continues to move downward. The protective frame 3 drives the guide frame 211 to continue to move downward. The guide frame 211 drives the vertical plate 205 to approach the center of the support frame 101 by the way of the inclined surface being in movable abutment with the abutting roller 207 and the sliding seat 204 being in sliding fit with the sliding groove 201. The vertical plate 205 drives the abutting plate 209 to approach the middle part of the support frame 101 by being connected to the sliding rod 208 and being connected to the second spring 210; when the abutting plate 209 starts to contact the outer wall of the concrete specimen 7, the guide frame 211 continues to move downward, so that the vertical plate 205 continues to approach the middle part of the support frame 101. Since the abutting plate 209 has contacted the outer wall of the concrete specimen 7, the second spring 210 is compressed, so that the abutting plate 209 is tightly attached to the outer wall of the concrete specimen 7. When the bottom of the protective frame 3 is matched with the abutting ring groove 102, the guide frame 211 stops moving downward. At this time, the positions of the sliding seat 204 and the vertical plate 205 are fixed, and the four-wall positioning of the concrete specimen 7 can be realized. At the same time, by circumferentially distributing on the abutting plate 209, the non-centered concrete specimen 7 can be pushed to the center of the support frame 101 during the positioning process of the concrete specimen 7, realizing the automatic centering positioning of the concrete specimen 7, which is convenient for subsequent strength detection;

[0043] Among them, the guide frame 211 is a right trapezoidal frame with an inclined surface facing the middle of the support frame 101, which can be effectively installed on the inner wall of the protective frame 3, and the width of the guide frame 211 is the same as the width of the abutting roller 207, which can improve the abutting effect of the abutting roller 207.

[0044] In an embodiment of the present invention, refer to Figures 1 - 6 , the movable connection assembly 6 includes a number of limiting holes 601 provided on the column 104. Symmetrically installed at both ends of the top of the protective frame 3 are guide cylinders 602. Symmetrically provided at both ends of the guide cylinder 602 are guide grooves 603. Symmetrically and slidably arranged in the guide cylinder 602 are limiting rods 604. Connected to the inner side of the guide cylinder 602 at the mutually approaching ends of the two limiting rods 604 is a third spring 606. The outer ends of the limiting rods 604 are in movable cooperation with the limiting holes 601. Connected to the mutually approaching ends of the two limiting rods 604 located in the guide cylinder 602 are movable rods 605 that are in sliding fit with the guide grooves 603. Symmetrically installed on the lifting plate 4 are J-shaped guide plates 607 that are in movable cooperation with the movable rods 605. The J-shaped guide plate 607 is composed of an inclined plate and a semi-circular ring. The J-shaped guide plate 607 is connected to the lifting plate 4 through a mounting frame 608.

[0045] In this embodiment, in the initial state, the protective frame 3 is at the highest point. At this time, the outer end of the limiting rod 604 abuts against the outer wall of the column 104, the third spring 606 is in a compressed state, and the movable rod 605 is located at the semi-circular ring of the J-shaped guide plate 607, that is, the movable rod 605 is in a clamped state with the J-shaped guide plate 607, and the synchronous lifting and lowering of the protective frame 3 and the lifting plate 4 can be realized;

[0046] When it is necessary to perform a strength test on the concrete specimen 7 placed on the support frame 101, the hydraulic cylinder 5 pushes the lifting plate 4 downward by slidingly mating with the column 104 through the lifting plate 4. The lifting plate 4 drives the J-shaped guide plate 607 to move downward synchronously by being connected to the mounting bracket 608. The J-shaped guide plate 607 drives the limiting rod 604 and the protective frame 3 to move downward by being clamped with the movable rod 605 and the guide cylinder 602 being connected to the protective frame 3. The protective frame 3 drives the guide frame 211 to move downward synchronously. The guide frame 211 realizes the automatic centering positioning of the concrete specimen 7 by movably abutting against the abutting roller 207. When the protective frame 3 cooperates with the abutting ring groove 102, at this time, the limiting rod 604 corresponds to the limiting hole 601, the third spring 606 extends and pushes the limiting rod 604 to move outward, realizing the connection of the limiting rod 604 to the limiting rod 604, making the protective frame 3 in a positioned state, making the concrete specimen 7 in a sealed state. At the same time, the limiting rod 604 releases the clamping between the movable rod 605 and the J-shaped guide plate 607 by driving the movable rod 605 to move outward synchronously, and releases the synchronous movement between the protective frame 3 and the lifting plate 4;

[0047] When the hydraulic cylinder 5 continues to push the lifting plate 4 downward, at this time, the protective frame 3 remains stationary, and the lifting plate 4 drives the pressure sensor 401 downward to perform a strength test on the concrete specimen 7;

[0048] After the strength test of the concrete specimen 7 is completed, the hydraulic cylinder 5 drives the lifting plate 4 to move upward. The lifting plate 4 drives the J-shaped guide plate 607 to move upward synchronously by being connected to the mounting bracket 608. The J-shaped guide plate 607 drives the two limiting rods 604 to approach each other by slidingly mating with the movable rod 605 through the inclined plate and the movable rod 605 slidingly mating with the guide groove 603. The limiting rod 604 releases the connection between the limiting rod 604 and the limiting hole 601 by approaching each other. The third spring 606 is stressed and contracts, releasing the fixation of the position of the protective frame 3. At this time, the movable rod 605 is re-clamped with the semi-circular ring on the J-shaped guide plate 607, realizing the re-synchronous movement of the protective frame 3 and the lifting plate 4;

[0049] When the hydraulic cylinder 5 continues to drive the lifting plate 4 to move upward, the lifting plate 4 drives the protective frame 3 to move upward synchronously by engaging with the movable rod 605 through the J-shaped guide plate 607, releasing the cooperation between the protective frame 3 and the abutting ring groove 102, facilitating the removal of the tested concrete specimen 7 and the cleaning of the surface of the support frame 101;

[0050] During the downward movement and positioning of the protective frame 3, automatic centering positioning of the concrete specimen 7 can be achieved. That is, when performing strength testing on the concrete specimen 7, the tester only needs to first place the concrete specimen 7 to be tested on the support frame 101, and then control the hydraulic cylinder 5 to push the lifting plate 4 downward, thereby achieving automatic centering positioning and strength testing of the concrete specimen 7. There is no need for the tester to perform too many steps, greatly simplifying the testing steps, and effectively avoiding the problem of inaccurate test results caused by inaccurate operating steps, improving the testing efficiency and accuracy of the concrete specimen 7;

[0051] Among them, several limiting holes 601 are on the same horizontal plane, and the length of the guide groove 603 is the same as the projected length of the J-shaped guide plate 607 on the horizontal plane, which can ensure the effective cooperation between the movable rod 605 and the J-shaped guide plate 607. The axis of the limiting hole 601 is parallel to the axis of the limiting rod 604, which can ensure the effective connection between the limiting rod 604 and the limiting hole 601, realizing the fixation of the position of the protective frame 3.

[0052] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall all be included within the protection scope of the present invention.

Claims

1. A concrete strength detection device for building construction, including a support assembly, characterized in that, The support assembly includes a support frame, on which a top plate is provided. The four corners of the support frame are connected to the top plate through columns. An abutting ring groove is provided on the support frame. A protective frame that abuts against the abutting ring groove in a sliding manner is provided on the column. A positioning assembly for fixing the concrete specimen is provided between the support frame and the protective frame. A lifting plate located inside the protective frame is slidably provided on the column. A pressure sensor is provided on one side of the lifting plate close to the support frame. A hydraulic cylinder connected to the top plate is provided on the other side of the lifting plate. An active connection assembly is provided between the protective frame and the lifting plate; The active connection assembly includes a number of limit holes provided on the column. Guide cylinders are symmetrically installed at both ends of the top of the protective frame. Guide grooves are symmetrically provided at both ends of the guide cylinder. Limit rods are symmetrically and slidably provided inside the guide cylinder. A third spring provided inside the guide cylinder is connected to the ends of the two limit rods close to each other. The outer ends of the limit rods are in active cooperation with the limit holes. Active rods that are slidably engaged with the guide grooves are respectively connected to the ends of the two limit rods located inside the guide cylinder close to each other. J-shaped guide plates that are in active cooperation with the active rods are symmetrically installed on the lifting plate. The J-shaped guide plates and the lifting plate are connected through mounting frames.

2. The concrete strength detection device for building construction according to claim 1, characterized in that, The positioning assembly includes four guide frames circumferentially distributed on the inner wall of the protective frame and four groups of movable modules circumferentially distributed on the support frame. The movable modules correspond to the guide frames one by one. Each movable module includes two chutes. A cross bar is provided inside the chutes. A sliding seat that slidably cooperates with the cross bar is slidably provided inside the chutes. A first spring sleeved outside the cross bar is connected between the chutes and the sliding seat. A vertical plate is installed on the sliding seat. A connecting plate is connected between the two vertical plates. An abutting roller is movably provided on one side of the connecting plate away from the middle of the support frame. A sliding rod is slidably provided on the vertical plate. An abutting plate is connected to the end of the sliding rod close to the middle of the support frame. A second spring sleeved outside the sliding rod is connected between the abutting plate and the vertical plate.

3. The concrete strength detection device for building construction according to claim 1, characterized in that, An observation window is provided on the front of the protective frame.

4. The concrete strength detection device for building construction according to claim 1, wherein, A number of chip collection grooves are provided at the center of the support assembly. A cavity is provided inside the support frame. A number of horizontal plates are horizontally distributed inside the cavity. Drawers are slidably provided on the horizontal plates.

5. The concrete strength detection device for building construction according to claim 2, characterized in that, The guide frame is a right trapezoidal frame with an inclined surface facing the middle of the support frame.

6. The concrete strength detection device for building construction according to claim 1, characterized in that, The J-shaped guide plate is composed of an inclined plate and a semi-circular ring.

7. The concrete strength detection device for building construction according to claim 1, characterized in that, The length of the guide groove is the same as the projected length of the J-shaped guide plate on the horizontal plane.

8. The concrete strength detection device for building construction according to claim 1, wherein, A number of limit holes are on the same horizontal plane, and the axis of the limit hole is parallel to the axis of the limit rod.

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