Building floor slab thickness detection device

Abstract

The invention relates to a building floor slab thickness detection device which comprises an anti-tilting disc and a telescopic rod group, the telescopic rod group is arranged on the anti-tilting disc, the upper end of the telescopic rod group is connected with an upper fixing frame, variable-amplitude telescopic arms are hinged to the two ends of the upper fixing frame, and measuring head fixing mechanisms are arranged at the ends of the variable-amplitude telescopic arms and the center of the upper fixing frame. A pressure relief piston assembly is arranged in the telescopic rod set. The telescopic rod set can fix the transmitting probe for detection on the lower wall of the floor and the ground, lifting is not needed, detection of multiple point positions of the floor can be completed, the pressure relief piston assembly can enable the telescopic rod set to automatically retract to the initial contraction state, pressure does not need to be applied downwards from the high position, and ground operation is facilitated.

Description

Technical Field

[0001] This invention belongs to the field of building inspection technology, specifically referring to a device for detecting the thickness of building floor slabs. Background Technology

[0002] During the acceptance inspection of building floors, the thickness of the floor slabs must be measured according to the "GB 50204-2015 Code for Acceptance of Construction Quality of Concrete Structures". When conducting the test according to the requirements of the above-mentioned standard, three points need to be measured on the same diagonal line of the floor slab, at the middle and 0.1m away from each end, and the average value should be taken.

[0003] Because the upper and lower walls of the floor slab are located in different spaces, the inspectors cannot locate two planes at the same time in the same space. Therefore, the inspection work must be completed by at least two people and cannot be done by one person.

[0004] During the testing operation, the testing personnel below hold a support rod to fix the transmitting probe to the support rod, and then lift the support rod to fix the transmitting probe to the testing position on the lower wall of the floor slab and keep it still. Another person is above the floor slab, holding a receiving probe and searching for the position of the transmitting probe. Data testing can only be carried out when the positions of the transmitting probe and the receiving probe are aligned.

[0005] During the process of locating the transmitting probe, the personnel holding it below must remain still for a long time. Since at least three points need to be checked on the floor of a room, the personnel need to repeat the above operation steps at least three times, which is extremely demanding on the physical strength and endurance of the personnel holding it. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, the present invention provides a building floor slab thickness detection device, which at least partially solves the above problems.

[0007] The technical solution adopted by the present invention is as follows: The present invention proposes a building floor slab thickness detection device, including an anti-tilt plate and a telescopic rod assembly. The telescopic rod assembly is set on the anti-tilt plate and can extend and retract to adjust its length to adapt to the detection of floor slab thickness in floors of different heights. The anti-tilt plate is slidably provided with circumferentially distributed anti-tilt rods. The anti-tilt plate and anti-tilt rods can make the bottom balance of the detection device stronger and prevent the risk of tipping over when the telescopic rod assembly is fully extended. Furthermore, the upper end of the telescopic rod assembly is connected to an upper fixed frame, and the telescopic rod assembly and the upper fixed frame can rotate relative to each other; Furthermore, both ends of the upper fixed frame are hinged with variable amplitude telescopic arms, which can extend and retract to different lengths to detect the edges of the diagonal of floor slabs of different lengths. The variable amplitude telescopic arms can rotate to an angle perpendicular or parallel to the upper fixed frame. Furthermore, a probe fixing mechanism is provided at the end of the luffing telescopic arm and at the center of the upper fixed frame. The probe fixing mechanism is used to install the transmitting probe. Three sets of transmitting probes can be installed simultaneously on the same diagonal of the floor slab. The transmitting probes can be selected for electromagnetic detection or ultrasonic detection, etc., depending on the actual working conditions. A receiving probe is used in conjunction with the transmitting probe. When the luffing telescopic arm is extended horizontally, all the probe fixing mechanisms are at the same height and attached to the lower wall of the floor slab. The transmitting probe can transmit signals to the upper part of the floor slab. The inspection personnel can receive the signals through the receiving probe above the floor slab and measure the thickness of the slab. At this time, no personnel need to be arranged below the floor slab to carry out single-person inspection. Furthermore, to simplify the structure and facilitate on-site operations, and to enable the luffing telescopic boom to be fixed in both horizontal and vertical states, wedges are inserted through both ends of the upper fixing frame. The wedges can be pulled out from the upper fixing frame. When the luffing telescopic boom is in a vertical state, the wedges are attached to the outer wall of the luffing telescopic boom to fix it. After the wedges are pulled out, the luffing telescopic boom is rotated to a horizontal state, and then the wedges are inserted into the upper fixing frame. At this time, the wedges are attached to the lower wall of the luffing telescopic boom to fix it.

[0008] Furthermore, the telescopic rod assembly includes an outer sleeve and a lifting rod. The outer sleeve is mounted on the anti-tilt plate, and the lifting rod slides within the outer sleeve. The upper fixed frame is mounted on the top of the lifting rod. When the lifting rod moves up and down relative to the outer sleeve, the probe fixing mechanism on the upper fixed frame moves synchronously, thereby adjusting the height of the transmitting probe. Furthermore, in order to enable the lifting rod to descend automatically without applying pressure from a height, a pressure relief piston assembly is provided inside the telescopic rod assembly. The pressure relief piston assembly includes an outer ring and an inner ring. The outer ring slides up and down within the telescopic rod assembly, and the side wall of the outer ring slides against the inner wall of the telescopic rod assembly. The outer ring cannot rotate relative to the telescopic rod assembly. The outer ring can be designed as a non-circular structure to prevent its rotation. The inner ring is rotatably located inside the outer ring cavity and can rotate relative to the outer ring. The inner ring is fixed to the lower end of the lifting rod, and the rotation of the lifting rod can drive the inner ring to rotate. Furthermore, the inner ring is slidably provided with a circumferentially distributed floating block, and a second spring is connected between the floating block and the inner ring. The second spring always pushes the floating block to the outside of the inner ring. The outer ring is provided with an inner circular hole at its center, and the inner circular hole is provided with a circumferentially distributed slots that cooperate with the floating block.

[0009] Furthermore, after the pressure relief is completed, in order to isolate the two sides of the pressure relief piston assembly again, the outer ring is provided with a first side plate, and the inner ring is provided with a second side plate. The second side plate is provided with a guide ring that penetrates the first side plate. A third spring that surrounds the guide ring is connected between adjacent first and second side plates. The angle of the first side plate remains fixed under the action of the outer ring, and the third spring always pushes the second side plate to a constant angle, so that the floating block is engaged with the slot. After the pressure relief is completed, if the inner ring is not subjected to external force, the inner ring will return to the initial angle under the action of the third spring, so that the floating block is engaged with the slot, thereby making the inner ring and the outer ring completely fit together, and the inner cavity of the telescopic rod assembly is once again completely isolated into two independent areas.

[0010] Furthermore, in the absence of additional power equipment, to drive the lifting and lowering of the telescopic assembly, an open cylinder is provided inside the outer sleeve. The upper end of the open cylinder is connected to the outer sleeve, and the bottom end of the open cylinder is provided with a vent hole, so that both the upper and lower ends of the open cylinder are connected to the inner cavity of the outer sleeve. The lifting rod is slidably disposed in the open cylinder, and the pressure relief piston assembly slides against the inner cavity of the open cylinder through an outer ring, thereby sealing the outer wall of the pressure relief piston assembly with the inner wall of the open cylinder. The outer sleeve is filled with high-pressure inert gas. When the pressure relief piston assembly isolates the upper and lower ends of the open cylinder, the pressure on the upper and lower walls of the pressure relief piston assembly is the same. Because the force-bearing area of ​​the upper wall of the pressure relief piston assembly is smaller than that of its lower wall, the upward thrust on its lower wall will be greater than the downward pressure on its upper wall. The pressure relief piston assembly will rise and drive the lifting rod to extend. When the slot in the pressure relief piston assembly connects the upper and lower cavities of the open cylinder, the pressure relief piston assembly will slide towards the lower end of the open cylinder under the action of gravity, thereby driving the lifting rod to retract. Furthermore, in order to actively control the lifting of the lifting rod, a lifting pin is slidably provided in the vent hole, penetrating the outer sleeve. A spring connects the lifting pin and the outer sleeve. When the lifting pin is subjected to an upward thrust, the outer sleeve and the inner cavity of the open cylinder are connected, and the pressure in any area of ​​the outer sleeve and the open cylinder is exactly the same. When the floating block in the pressure relief piston assembly is embedded in the slot, the pressure relief piston assembly will rise under the action of the pressure difference, thereby realizing the control of the lifting rod. When it is necessary to retract the lifting rod, simply rotate the lifting rod. The lifting rod drives the inner ring to rotate, causing the floating block to be misaligned with the slot. The upper and lower ends of the pressure relief piston assembly are connected, and the upper and lower sides of the pressure relief piston assembly are no longer subjected to the pressure difference. Under the action of gravity, the piston slides down, thereby driving the lifting rod to retract. There is no need for personnel to apply pressure downward from a height, which is convenient for personnel to work on the ground.

[0011] Furthermore, the probe fixing mechanism includes a fixing plate, which is respectively arranged on the upper wall of the upper fixing frame and the outer end of the telescopic boom. A lifting plate is slidably provided in the fixing plate, and a ball joint is hinged in the lifting plate. The transmitting probe is connected to the top of the ball joint. A spring is provided at the lower end of the lifting plate. When the ground in the detection space is uneven or the floor slab has a certain angle, the ball joint can automatically adjust a certain angle, and under the thrust of the spring, the transmitting probe on the ball joint is always in contact with the bottom wall of the floor slab, preventing gaps between the transmitting probe and the floor slab, which would affect the detection results.

[0012] The beneficial effects achieved by the present invention using the above structure are as follows: 1. The telescopic pole assembly can fix the detection transmitter probe on the lower wall of the floor slab and the ground without lifting it. When combined with the telescopic pole assemblies on both sides, it can efficiently detect three points on a floor slab. 2. The pressure relief piston assembly enables the telescopic rod assembly to automatically retract to its initial retracted state, eliminating the need to apply pressure downwards from a height, thus facilitating ground operations. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention; Figure 2 This is a fracture view of the present invention in its working state according to an embodiment; Figure 3 for Figure 1 A sectional view; Figure 4 for Figure 3 Enlarged view of section I; Figure 5 A broken view of the cross-sectional view of the outer sleeve; Figure 6 This is a schematic diagram of the pressure relief piston assembly; Figure 7 Exploded view of the pressure relief piston assembly; Figure 8 A cross-sectional view of the pressure relief piston assembly as it rises; Figure 9 This is a cross-sectional view of the pressure relief piston assembly as it descends. Figure 10 This is a partial sectional view of the outer ring; Figure 11 This is a cross-sectional view of the inner ring; Figure 12 This is a cross-sectional view of the probe fixing mechanism.

[0014] The components are as follows: 1. Anti-tilt disc, 2. Telescopic rod assembly, 3. Upper fixed frame, 4. Luffing telescopic arm, 5. Probe fixing mechanism, 6. Anti-tilt rod, 7. Wedge block, 8. Outer sleeve, 9. Lifting rod, 10. Lifting pin, 11. Spring 1, 12. Pressure relief piston assembly, 13. Opening cylinder, 14. Vent hole, 15. Outer ring, 16. Inner ring, 17. Floating block, 18. Spring 2, 19. Side plate 1, 20. Side plate 2, 21. Guide ring, 22. Spring 3, 23. Inner round hole, 24. Slot, 25. Fixed disc, 26. Lifting plate, 27. Ball joint, 28. Spring 4.

[0015] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. Detailed Implementation

[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0017] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0018] like Figure 1 and Figure 2 As shown, the present invention proposes a building floor slab thickness detection device, including an anti-tilt plate 1 and a telescopic rod group 2. The telescopic rod group 2 is disposed on the anti-tilt plate 1 and can extend and retract to adjust its length to adapt to the detection of floor slab thickness in floors of different heights. The anti-tilt plate 1 is slidably provided with circumferentially distributed anti-tilt rods 6. The anti-tilt plate 1 and the anti-tilt rods 6 can make the bottom balance of the detection device stronger and prevent the risk of tipping over when the telescopic rod group 2 is fully extended. The upper end of the telescopic rod assembly 2 is connected to the upper fixed frame 3, and the telescopic rod assembly 2 and the upper fixed frame 3 can rotate relative to each other. Both ends of the upper fixed frame 3 are hinged with variable-amplitude telescopic arms 4. The variable-amplitude telescopic arms 4 can extend and retract to different lengths to inspect the edges of the diagonal of floor slabs of different lengths. The variable-amplitude telescopic arms 4 can rotate to an angle perpendicular or parallel to the upper fixed frame 3, such as... Figure 1As shown, the luffing telescopic boom 4 in its vertical position is easy to store, such as... Figure 2 As shown, the horizontally positioned luffing telescopic boom 4 is capable of performing inspection operations; The ends of the luffing telescopic boom 4 and the center of the upper fixed frame 3 are both equipped with probe fixing mechanisms 5. The probe fixing mechanisms 5 are used to install the transmitting probes. Three sets of transmitting probes can be installed simultaneously on the same diagonal of the floor slab. The transmitting probes can be selected for electromagnetic detection or ultrasonic detection, etc., depending on the actual working conditions. The receiving probes are paired with the transmitting probes. When the luffing telescopic boom 4 is extended horizontally, all the probe fixing mechanisms 5 are at the same height and are attached to the lower wall of the floor slab. The transmitting probes can transmit signals to the upper part of the floor slab. The inspectors can receive the signals through the receiving probes above the floor slab and measure the thickness of the slab. At this time, no personnel need to be arranged below the floor slab to carry out single-person inspection. To simplify the structure and facilitate on-site operations, allowing the luffing boom 4 to be fixed in both horizontal and vertical positions, wedges 7 are inserted through both ends of the upper fixing frame 3. The wedges 7 can be pulled out from the upper fixing frame 3. When the luffing boom 4 is in a vertical position, the wedges 7 adhere to the outer wall of the luffing boom 4 to fix it. After the wedges 7 are pulled out, the luffing boom 4 is rotated to a horizontal position, and then the wedges 7 are inserted into the upper fixing frame 3. At this time, the wedges 7 adhere to the lower wall of the luffing boom 4 to fix it.

[0019] like Figures 2-4 As shown, the telescopic rod assembly 2 includes an outer sleeve 8 and a lifting rod 9. The outer sleeve 8 is mounted on the anti-tilt plate 1, and the lifting rod 9 slides in the outer sleeve 8. The upper fixing frame 3 is mounted on the top of the lifting rod 9. When the lifting rod 9 moves up and down relative to the outer sleeve 8, the probe fixing mechanism 5 on the upper fixing frame 3 moves synchronously to adjust the height of the transmitting probe. In order to enable the lifting boom 9 to descend automatically without applying pressure to it from a height, the telescopic boom assembly 2 is equipped with a pressure relief piston assembly 12, such as... Figure 6 and Figure 7 As shown, the pressure relief piston assembly 12 includes an outer ring 15 and an inner ring 16. The outer ring 15 slides up and down within the telescopic rod assembly 2, and its sidewall is slidably fitted against the inner wall of the telescopic rod assembly 2. The outer ring 15 cannot rotate relative to the telescopic rod assembly 2. The outer ring 15 can be configured as a non-circular structure to prevent its rotation. The inner ring 16 is rotatably located within the cavity of the outer ring 15 and can rotate relative to the outer ring 15. Figure 4 As shown, the inner ring 16 is fixed to the lower end of the lifting rod 9, and the inner ring 16 can rotate when the lifting rod 9 rotates. Reference Figure 7 and Figure 11 As shown, floating blocks 17 arranged in a circular array are slidably provided on the inner ring 16. A second spring 18 is connected between the floating blocks 17 and the inner ring 16. The second spring 18 always pushes the floating blocks 17 to the outside of the inner ring 16. like Figure 10 As shown, the outer ring 15 has an inner circular hole 23 at its center, and the inner circular hole 23 has a circumferential array of slots 24 that mate with the floating block 17. (Refer to...) Figure 8 As shown, when the floating block 17 on the inner ring 16 rotates to the angle where the slot 24 is located, the floating block 17 is fully embedded in the slot 24 under the action of the spring 18. The inner ring 16 and the outer ring 15 are completely in contact, and the outer ring 15 is completely in contact with the inner wall of the telescopic rod assembly 2. At this time, the outer ring 15 and the inner ring 16 isolate the inner cavity of the telescopic rod assembly 2 vertically. (Refer to...) Figure 9 As shown, when the floating block 17 on the inner ring 16 continues to rotate to a position that is offset from the slot 24, the floating block 17 is retracted into the inner ring 16 by the pressure of the side wall of the inner circular hole 23, and a gap appears between the slot 24 and the inner ring 16, so that the slot 24 can connect the areas located at the upper and lower ends of the outer ring 15 in the telescopic rod assembly 2.

[0020] like Figure 6 and Figure 7 As shown, after the pressure relief is completed, in order to isolate the two sides of the pressure relief piston assembly 12 again, the outer ring 15 is provided with a first side plate 19, and the inner ring 16 is provided with a second side plate 20. The second side plate 20 is provided with a guide ring 21 that passes through the first side plate 19. A third spring 22 that surrounds the guide ring 21 is connected between the adjacent first side plate 19 and second side plate 20. The angle of the first side plate 19 is kept fixed under the action of the outer ring 15. The third spring 22 always pushes the second side plate 20 to a constant angle, so that the floating block 17 is engaged with the slot 24. After the pressure relief is completed, if the inner ring 16 is not subjected to external force, the inner ring 16 will return to the initial angle under the action of the third spring 22, so that the floating block 17 is engaged with the slot 24, thereby making the inner ring 16 completely fit with the outer ring 15, and the inner cavity of the telescopic rod assembly 2 is completely isolated into two independent areas again.

[0021] like Figure 4 and Figure 5As shown, in the absence of additional power equipment, in order to drive the lifting and lowering of the telescopic assembly, the outer sleeve 8 is provided with an open cylinder 13. The upper end of the open cylinder 13 is connected to the outer sleeve 8, and the bottom end of the open cylinder 13 is provided with a vent hole 14, so that both the upper and lower ends of the open cylinder 13 are connected to the inner cavity of the outer sleeve 8. The lifting rod 9 is slidably disposed in the open cylinder 13, and the pressure relief piston assembly 12 is fitted and slidably attached to the inner cavity of the open cylinder 13 through the outer ring 15, so that the outer side wall of the pressure relief piston assembly 12 is sealed and fitted to the inner side wall of the open cylinder 13. The outer sleeve 8 is filled with high-pressure inert gas. When the pressure relief piston assembly 12 isolates the upper and lower ends of the open cylinder 13, the pressure on the upper and lower walls of the pressure relief piston assembly 12 is the same. Since the force-bearing area of ​​the upper wall of the pressure relief piston assembly 12 is smaller than that of the lower wall, the upward thrust on the lower wall will be greater than the downward pressure on the upper wall. The pressure relief piston assembly 12 will rise and drive the lifting rod 9 to extend. When the slot 24 in the pressure relief piston assembly 12 connects the upper and lower cavities of the open cylinder 13, the pressure relief piston assembly 12 will slide towards the lower end of the open cylinder 13 under the action of gravity, thereby driving the lifting rod 9 to retract. To actively control the lifting of the lifting rod 9, a lifting pin 10 is slidably installed in the vent hole 14, penetrating the outer sleeve 8. A spring 11 connects the lifting pin 10 and the outer sleeve 8. When the lifting pin 10 is subjected to an upward thrust, the inner cavity of the outer sleeve 8 and the open cylinder 13 are connected. The pressure in any area of ​​the outer sleeve 8 and the open cylinder 13 is exactly the same. When the floating block 17 in the pressure relief piston assembly 12 is embedded in the slot 24, the pressure relief piston assembly 12 will rise under the action of the pressure difference, thereby realizing the control of the lifting rod 9. When it is necessary to retract the lifting rod 9, simply rotate the lifting rod 9. The lifting rod 9 drives the inner ring 16 to rotate, causing the floating block 17 to be misaligned with the slot 24. The upper and lower ends of the pressure relief piston assembly 12 are connected, and the upper and lower sides of the pressure relief piston assembly 12 are no longer subjected to the pressure difference. Under the action of gravity, the lifting rod 9 is pulled back, eliminating the need for personnel to apply pressure from above, which is convenient for personnel to work on the ground.

[0022] like Figure 2 and Figure 12 As shown, the probe fixing mechanism 5 includes a fixing plate 25, which is respectively arranged on the upper wall of the upper fixing frame 3 and the outer end of the telescopic boom. A lifting plate 26 is slidably provided inside the fixing plate 25. A ball joint 27 is hinged in the lifting plate 26. The transmitting probe is connected to the top of the ball joint 27. A spring 4 28 is provided at the lower end of the lifting plate 26. When the ground where the detection space is located is uneven or the floor slab has a certain angle, the ball joint 27 can automatically adjust a certain angle, and under the thrust of the spring 4 28, the transmitting probe on the ball joint 27 is always in contact with the bottom wall of the floor slab, preventing gaps between the transmitting probe and the floor slab, which would affect the detection results.

[0023] In practical use, first fix the anti-tilt plate 1 on the ground, so that it is directly below the middle of the diagonal of the floor slab. Then, pull out all the anti-tilt rods 6 to enhance the stability of the detection device and prevent it from tipping over during the detection process. Then, fix the three transmitting probes in sequence on the ball joints 27 of the left, middle and right probe fixing mechanisms 5. According to the length of the diagonal, after confirming the detection points on both sides, the length of the variable amplitude telescopic arm 4 needs to be adjusted.

[0024] First, pull out the wedge 7, rotate the luffing telescopic arm 4 90 degrees to make it horizontal, and then insert the wedge 7 into the upper fixing frame 3. The wedge 7 keeps the luffing telescopic arm 4 horizontal. Then pull the luffing telescopic arm 4 outward so that its end reaches the farthest detection point on the diagonal of the floor. At this time, the transmitting probes in the three sets of probe fixing mechanisms 5 are all directly below the detection point on the floor.

[0025] Then, insert your foot under the lifting pin 10 and push the lifting pin 10 upward with your toes. The lifting pin 10 overcomes the resistance of the spring 11 and rises upward, no longer sealing the vent 14. The outer sleeve 8 and the open sleeve 13 are completely connected. The pressure in any area of ​​the outer sleeve 8 and the open sleeve 13 is exactly the same. At this time, the floating block 17 in the pressure relief piston assembly 12 is completely embedded in the slot 24. The pressure relief piston assembly 12 isolates the open sleeve 13 into upper and lower areas. The force-bearing area of ​​the lower wall of the pressure relief piston assembly 12 is greater than that of the upper wall. According to the pressure formula, the upward thrust on the lower wall of the pressure relief piston assembly 12 is greater than the downward thrust on its upper wall. The pressure relief piston assembly 12 will rise upward under the action of the pressure difference, thereby causing the lifting rod 9 to extend upward.

[0026] When the lifting rod 9 rises, it will drive the upper fixed frame 3 to rise. The upper fixed frame 3 will simultaneously drive the two sides of the variable amplitude telescopic arms 4 to move upward until the transmitting probe is in contact with the lower wall of the floor. At this time, the foot is pulled out from under the lifting pin 10. Under the action of the spring 11, the lifting pin 10 seals and blocks the vent hole 14 again. The opening cylinder 13 is once again isolated into two independent areas. The internal pressure cannot be kept constant. The pressure relief piston assembly 12 no longer rises due to the pressure difference, thereby fixing the lifting rod 9 at the current extension height.

[0027] During the process of the transmitting probe being attached to the floor slab, the transmitting probe will automatically adjust according to the angle between the ground and the floor slab to ensure that the transmitting probe is always attached to the lower wall of the floor slab. When there is an angle between the transmitting probe and the floor slab, the spring 4 28 pushes the lifting plate 26 to move upward, so that the transmitting probe contacts the floor slab at a certain angle. Uneven force on the transmitting probe causes one end to tilt, which drives the ball joint 27 to rotate at a certain angle until the transmitting probe is completely attached to the floor slab, thereby ensuring that there is no gap between the transmitting probe and the floor slab in the detection state and improving the detection accuracy.

[0028] At this time, the three detection points diagonally below the floor slab are equipped with transmitting probes. The testing personnel can hold the receiving probe to the space above the floor slab to receive and test the signal, thus completing the single-person test.

[0029] After the inspection is completed, the inspectors return to the space below the floor slab, manually rotate the lifting rod 9 to a certain angle and hold it still. The lifting rod 9 drives the inner ring 16 to rotate a certain angle, causing the floating block 17 to be misaligned and separated from the slot 24. The slot 24 reconnects the upper and lower ends of the pressure relief piston assembly 12. The pressure relief piston assembly 12 will slide down to the bottom of the open cylinder 13 under the gravity of all the components above until the lifting rod 9 is completely retracted. The inspectors can complete the recovery operation on the ground without having to apply pressure from above.

[0030] After the lifting rod 9 is retracted, the inspector releases his hand, and the lifting rod 9 is no longer subjected to rotational force. Spring 3 22 will push side plate 2 20 to rotate away from side plate 1 19, so that the floating block 17 is re-embedded in the slot 24. The pressure relief piston assembly 12 once again isolates the opening cylinder 13 into two independent areas so that the lifting rod 9 can be extended again for the next use.

[0031] Then, retract the luffing telescopic arm 4 to its shortest position, pull out the wedge block 7, rotate the luffing telescopic arm 4 to a vertical position, remove the transmitting probe from the probe fixing mechanism 5, and complete the storage of the detection device, thus completing all the detection work.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0033] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A device for detecting the thickness of building floor slabs, comprising an anti-tilting plate (1), characterized in that, Also includes: A telescopic rod assembly (2) is provided on the anti-tilt plate (1). The telescopic rod assembly (2) is provided with a pressure relief piston assembly (12) that controls its automatic retraction. The pressure relief piston assembly (12) includes an outer ring (15) and an inner ring (16). The outer ring (15) slides non-rotatably in the telescopic rod assembly (2). The inner ring (16) is rotatably located in the inner cavity of the outer ring (15). Circularly arranged floating blocks (17) are slidably provided on the inner ring (16). A spring (18) is connected between the floating blocks (17) and the inner ring (16). The outer ring (15) has an inner circular hole (23) at its center. The inner circular hole (23) has a circumferentially arranged slots (24) that cooperate with the floating blocks (17). The upper fixed frame (3) is rotatably mounted on the upper end of the telescopic rod assembly (2); The variable-amplitude telescopic boom (4) is symmetrically hinged to both ends of the upper fixed frame (3); The probe fixing mechanism (5) is located at the center of the upper fixing frame (3) and at the end of the variable amplitude telescopic arm (4).

2. The building floor slab thickness detection device according to claim 1, characterized in that: The outer ring (15) is provided with a side plate 1 (19) arrayed on it, and the inner ring (16) is provided with a side plate 2 (20) arrayed on it. The side plate 2 (20) is provided with a guide ring (21) that passes through the side plate 1 (19). A spring 3 (22) that surrounds the guide ring (21) is connected between adjacent side plates 1 (19) and side plates 2 (20).

3. The building floor slab thickness detection device according to claim 1, characterized in that: The telescopic rod assembly (2) includes an outer sleeve (8) and a lifting rod (9). The outer sleeve (8) is located on the anti-tilt plate (1), and the lifting rod (9) slides in the outer sleeve (8). The upper fixing frame (3) is located at the top of the lifting rod (9).

4. The building floor slab thickness detection device according to claim 3, characterized in that: The inner ring (16) is fixed to the lower end of the lifting rod (9).

5. The building floor slab thickness detection device according to claim 3, characterized in that: The outer sleeve (8) is provided with an open tube (13), and the bottom end of the open tube (13) is provided with a vent hole (14).

6. The building floor slab thickness detection device according to claim 5, characterized in that: The lifting rod (9) is slidably disposed in the open cylinder (13), and the pressure relief piston assembly (12) is slidably attached to the inner cavity of the open cylinder (13) through the outer ring (15).

7. The building floor slab thickness detection device according to claim 5, characterized in that: A lifting pin (10) that penetrates the outer sleeve (8) is slidably provided in the vent hole (14), and a spring (11) is connected between the lifting pin (10) and the outer sleeve (8).

8. The building floor slab thickness detection device according to claim 1, characterized in that: The probe fixing mechanism (5) includes a fixing plate (25), which is respectively arranged on the upper wall of the upper fixing frame (3) and the outer end of the telescopic boom. A lifting plate (26) is slidably provided in the fixing plate (25), and a ball joint (27) is hinged in the lifting plate (26). A spring (28) is provided at the lower end of the lifting plate (26).

9. The building floor slab thickness detection device according to claim 1, characterized in that: The upper fixing frame (3) has removable wedges (7) at both ends for fixing the variable amplitude telescopic arm (4) at different angle positions.

10. The building floor slab thickness detection device according to claim 1, characterized in that: The anti-tilt disc (1) is provided with circumferentially distributed anti-tilt rods (6).

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