A device for detecting and eliminating residual stress in concrete

Abstract

The present invention discloses a concrete residual stress detection and elimination device, including a detection device and an elimination device, the detection device including a detection seat, a top seat, a strain gauge and a detection component, the detection seat and the top seat are connected by a bracket, the detection seat is provided with a controller and a detection slot, a concrete block is embedded in the detection slot, a detection sheet is bonded to the concrete block, a clamping component is provided on both sides of the detection seat, strain gauges are distributed on the detection sheet, adhesive strips are provided on both sides of the strain gauge, and the strain gauge is fixed to the top of the top seat. This detection device adopts mobile integrated detection, and generates external force on the concrete block through the counter-rotating pressure wheel and cooperates with the hydraulic push rod to make the pressure wheel move on the concrete block. During the movement, multiple groups of strain gauges distributed on the detection sheet will detect the internal stress generated at different positions on the surface of the concrete block in turn, which is done in one go, fast and efficient.

Description

Technical Field

[0001] The invention relates to the technical field of concrete detection, in particular to a device for detecting and eliminating residual stress in concrete. Background Art

[0002] Residual stress is the self-balanced internal stress that remains in an object after external forces or uneven temperature fields are eliminated. The existence of residual stress sometimes does not immediately manifest as a defect. However, when the concrete block is under pressure, the stress generated and the residual stress are superimposed, causing the total stress to exceed the strength limit, resulting in cracks and fractures, which affect the effect of the concrete in use.

[0003] Residual stress detection is generally performed by using a strain gauge in conjunction with a strain gauge. A circular strain gauge is fixed on a concrete block, and a hole is drilled at the center of the circle so that the concrete block in the circular edge area will generate internal stress. The data on the internal stress generated is collected through the strain gauge, and the residual stress can be understood through the strain gauge. This method belongs to the hole detection method, which can only be used for small concrete blocks. Since the residual stress at different positions of the concrete block is different, if the concrete is large, the external force generated by the drilling will not involve the rest of the concrete block, resulting in limitations. In order to ensure the accuracy of the detection, it is necessary to perform detection at different positions on the concrete block, which takes a long time and has low efficiency. The present invention provides a concrete residual stress detection and elimination device. Summary of the invention

[0004] The purpose of the present invention is to provide a concrete residual stress detection and elimination device to solve the problem that the residual stress detection of large concrete proposed in the above background technology requires detection at different positions on the concrete block through hole detection in order to ensure the accuracy of the detection data, which is time-consuming and inefficient.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A device for detecting and eliminating residual stress in concrete, comprising a detection device and an elimination device, wherein the detection device comprises a detection seat, a top seat, a strain gauge and a detection assembly, wherein the detection seat and the top seat are connected via a bracket, wherein a controller and a detection slot are arranged on the detection seat, wherein a concrete block is embedded in the detection slot, wherein a detection sheet is bonded to the concrete block, wherein clamping assemblies are arranged on both sides of the detection seat, strain gauges are distributed on the detection sheet, and adhesive strips are arranged on both sides of the strain gauge, wherein the strain gauge is fixed to the top of the top seat, wherein the strain gauge passes through the top seat through a line and is respectively connected to the strain gauges on the detection sheet, wherein a second hydraulic push rod is fixed to one side of the top seat, wherein a moving slot is arranged on the bottom surface of the top seat, wherein a moving seat is embedded in the moving slot, wherein the telescopic end of the second hydraulic push rod passes through the top seat and is locked and fixed to the moving seat by screws, wherein the detection assembly comprises an equipment frame, a third hydraulic push rod and The pressure wheel, the third hydraulic push rod is locked and fixed to the movable seat by screws, the telescopic end of the third hydraulic push rod is locked and fixed to the equipment frame by screws, a motor is fixed to one side of the equipment frame, and a connecting frame is welded on the other side, a first transmission wheel is connected to the connecting frame, one end of the first transmission wheel is connected to the connecting frame by rotating screws, and the other end is fixed to the transmission end of the motor by screws, the pressure wheel is connected to the equipment frame by rotating screws, a second transmission wheel is welded on the pressure wheel, and the second transmission wheel is connected to the first transmission wheel by a transmission belt; as a preferred embodiment of the present invention, the elimination device includes a liquid tank, a liquid pump and a spray gun, the liquid tank is injected with concrete enhancer, the liquid tank and the liquid pump are both fixed to one side of the top of the top seat by screws, the liquid tank is connected to the water inlet port of the liquid pump through a rubber hose, and the water outlet port of the liquid pump is connected to the spray gun through a rubber hose.

[0007] As a preferred embodiment of the present invention, the clamping assembly consists of a first hydraulic push rod and a clamping plate, the first hydraulic push rod is fixed to both sides of the detection seat by screws, the clamping plate is located on both sides of the detection groove, the telescopic end of the first hydraulic push rod passes through the side end of the detection seat and is locked and fixed with the clamping plate by screws, and a rubber gasket is bonded to the clamping surface of the clamping plate.

[0008] As a preferred embodiment of the present invention, a control panel and a device interface are provided on the controller, and the controller is respectively connected to the first hydraulic push rod, the liquid pump, the second hydraulic push rod and the motor through lines.

[0009] As a preferred embodiment of the present invention, the detection plate is bonded to both sides of the concrete block, through holes are distributed on both sides of the top seat, the number of strain gauges on the detection plates on both sides of the concrete block is the same and they are connected to the strain gauge through lines passing through the through holes distributed on both sides of the top seat.

[0010] As a preferred embodiment of the present invention, the pressure wheel, the first transmission wheel and the second transmission wheel are all made of stainless steel, and the first transmission wheel and the second transmission wheel are the same in size and correspond in position.

[0011] As a preferred embodiment of the present invention, a support rod is provided on the spray gun, and the support rod is an "L" structure. One end of the support rod is fixed to the bottom of the spray gun nozzle by a screw, and the other end is welded with a ring sleeve, and a liquid collecting cup is embedded on the ring sleeve. The support rod and the ring sleeve are both made of metal.

[0012] As a preferred embodiment of the present invention, the liquid collecting cup is a PVC cup body, and a limiting edge is provided on the cup mouth of the liquid collecting cup. Magnetic blocks are bonded to the mating surface of the limiting edge, and the magnetic blocks are evenly distributed along the mating surface of the limiting edge. The magnetic blocks are adsorbed and connected to the ring sleeve.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. This detection device adopts mobile integrated detection. The counter-rotating pressure wheel generates external force on the concrete block and cooperates with the hydraulic push rod to make the pressure wheel move on the concrete block. During the movement, multiple groups of strain gauges distributed on the detection piece will detect the internal stress generated at different positions on the surface of the concrete block in turn. It is done in one go, fast and efficient.

[0015] 2. This device combines a detection device and a residual stress elimination device in one. After detecting one end face of the concrete block, the other end face of the concrete block is sprayed with concrete reinforcing liquid to strengthen the surface structure of the concrete block, thereby eliminating the residual stress on the concrete surface. Through secondary testing, data comparison is achieved, thereby better analyzing the concrete block comprehensively and ensuring the accuracy of the detection data and the accuracy of the concrete structure evaluation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 It is a schematic diagram of the top seat structure of the present invention;

[0018] Figure 3 It is an overall front view of the detection assembly of the present invention;

[0019] Figure 4 It is an overall side view of the detection assembly of the present invention;

[0020] Figure 5 It is a schematic diagram of the structure of the detection sheet of the present invention;

[0021] Figure 6 It is a schematic diagram of the spray gun structure of the present invention;

[0022] Figure 7 It is a schematic diagram of the structure of the liquid collecting cup of the present invention.

[0023] In the figure: 1-detection seat, 2-top seat, 3-strain gauge, 4-detection component, 5-controller, 6-detection groove, 7-concrete block, 8-detection plate, 9-first hydraulic push rod, 10-clamping plate, 11-liquid tank, 12-liquid pump, 13-spray gun, 14-moving groove, 15-second hydraulic push rod, 16-moving seat, 17-equipment frame, 18-third hydraulic push rod, 19-pressure wheel, 20-motor, 21-connecting frame, 22-first transmission wheel, 23-second transmission wheel, 24-strain gauge, 25-adhesive strip, 26-support rod, 27-ring sleeve, 28-liquid collecting cup, 29-limiting edge. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] See also Figure 1-7 , the present invention provides a technical solution:

[0026] A device for detecting and eliminating residual stress in concrete, comprising a detection device and an elimination device, wherein the detection device comprises a detection seat 1, a top seat 2, a strain gauge 3 and a detection assembly 4, wherein the detection seat 1 and the top seat 2 are connected via a bracket, wherein a controller 5 and a detection slot 6 are arranged on the detection seat 1, wherein a concrete block 7 is embedded in the detection slot 6, wherein a detection sheet 8 is bonded to the concrete block 7, wherein a clamping assembly is arranged on both sides of the detection seat 1, wherein strain gauges 24 are distributed on the detection sheet 8, wherein adhesive strips 25 are arranged on both sides of the strain gauge 24, wherein the strain gauge 3 is fixed to the top of the top seat 2, wherein the strain gauge 3 is connected to the strain gauges 24 on the detection sheet 8 via a line penetrating the top seat 2, wherein a second hydraulic push rod 15 is fixed to one side of the top seat 2, wherein a movable slot 14 is arranged on the bottom surface of the top seat 2, wherein the movable slot 14 is provided with a plurality of movable slots 14. A movable seat 16 is embedded inside, the telescopic end of the second hydraulic push rod 15 passes through the top seat 2 and is locked and fixed with the movable seat 16 by screws, the detection component 4 includes an equipment frame 17, a third hydraulic push rod 18 and a pressure wheel 19, the third hydraulic push rod 18 is locked and fixed with the movable seat 16 by screws, the telescopic end of the third hydraulic push rod 18 is locked and fixed with the equipment frame 17 by screws, a motor 20 is fixed on one side of the equipment frame 17, and a connecting frame 21 is welded on the other side, a first transmission wheel 22 is connected to the connecting frame 21, one end of the first transmission wheel 22 is connected to the connecting frame 21 by rotating screws, and the other end is fixed to the transmission end of the motor 20 by screws, the pressure wheel 19 is connected to the equipment frame 17 by rotating screws, and a second transmission wheel 22 is welded on the pressure wheel 19 The first transmission wheel 23 is connected to the second transmission wheel 22 through a transmission belt; the elimination device includes a liquid tank 11, a liquid pump 12 and a spray gun 13. The liquid tank 11 is injected with concrete reinforcing agent. The liquid tank 11 and the liquid pump 12 are fixed to one side of the top of the top seat 2 by screws. The liquid tank 11 is connected to the water inlet port of the liquid pump 12 through a rubber hose, and the water outlet port of the liquid pump 12 is connected to the spray gun 13 through a rubber hose. The elimination device of this case is established on the residual stress detection device. The residual stress change of the concrete block is detected before and after the residual stress is eliminated. The device integrates the detection device and the elimination device into one, which is convenient for detecting the residual stress of the concrete block. The detection method is to adhere multiple sets of strain gauges 24 on both sides of the concrete block The detection piece 8, through the counter-rotating pressure wheel 19 and the forward-pushing hydraulic push rod, makes the pressure wheel 19 generate external force on the concrete block, and internal stress is generated on the surface of the concrete block. The internal stress generated at different positions during the movement of the pressure wheel 19 on the surface of the concrete block is detected by multiple sets of strain gauges 24, and presented by the strain gauge 3. After the detection of one side of the concrete block 7 is completed, the concrete reinforcing agent is sprayed on the other side of the concrete block 7 to change the structure of the surface of the concrete block 7, and the above-mentioned method is used again to detect the change of residual stress. The overall structural condition of the concrete block can be evaluated through the change. This detection method can detect the internal stress generated on the entire surface of the concrete block at one time, with high speed and efficiency.

[0027] The clamping assembly consists of a first hydraulic push rod 9 and a clamping plate 10. The first hydraulic push rod 9 is fixed to both sides of the detection seat 1 by screws. The clamping plates 10 are located on both sides of the detection groove 6. The telescopic ends of the first hydraulic push rod 9 pass through the side ends of the detection seat 1 and are locked and fixed with the clamping plates 10 by screws. The clamping surface of the clamping plate 10 is bonded with a rubber gasket. The clamping assembly mainly provides a clamping effect on the concrete, mainly by driving the clamping plate 10 through the hydraulic push rod to clamp both sides of the concrete block, thereby ensuring the stability of the concrete during detection.

[0028] The controller 5 is provided with a control panel and an equipment interface. The controller 5 is connected to the first hydraulic push rod 9, the liquid pump 12, the second hydraulic push rod 15 and the motor 20 through lines respectively. The controller 5 only controls the detection equipment components. The detection of the strain gauge is an independent control method, so as to distinguish the control of the detection equipment and the strain force detection equipment. The first hydraulic push rod 9, the second hydraulic push rod 15 and the third hydraulic push rod 18 are all hydraulic equipment, and their optional model is DYT (B). The liquid pump 12 is a micro pump, and its optional model is TL-B03H / 2. The motor 20 is a three-phase asynchronous motor, and its optional model is JL4-132M. The optional model of the strain gauge 3 is CS-YL03.

[0029] The detection sheet 8 is bonded to both sides of the concrete block 7, and through holes are distributed on both sides of the top seat 2. The number of strain gauges 24 on the detection sheet 8 on both sides of the concrete block 7 is the same and they are connected to the strain gauge 3 through lines passing through the through holes distributed on both sides of the top seat 2. The detection sheets 8 on both sides of the concrete block can be bonded or pressed by an external clamping component. The internal stress generated at different positions of the concrete block is detected by multiple groups of strain gauges 24 on the detection sheet 8. The optional model of the strain gauge 24 is BX120-10CA.

[0030] The pressure wheel 19, the first transmission wheel 22 and the second transmission wheel 23 are all made of stainless steel. The first transmission wheel 22 and the second transmission wheel 23 are of the same size and have corresponding positions. The stainless steel wheel is not easy to be damaged, and the transmission wheels with the same structure ensure the consistency of the transmission structure.

[0031] A support rod 26 is provided on the spray gun 13, and the support rod 26 is an "L" structure. One end of the support rod 26 is fixed to the bottom of the spray gun 13 nozzle by screws, and the other end is welded with a ring sleeve 27, and a liquid collecting cup 28 is embedded in the ring sleeve 27. The support rod 26 and the ring sleeve 27 are both made of metal material. The ring sleeve 27 on the support rod 26 can provide a bearing function for the liquid collecting cup 28.

[0032] The liquid collecting cup 28 is a PVC cup body, and a limiting edge 29 is provided on the cup mouth of the liquid collecting cup 28. Magnetic blocks are bonded to the fitting surface of the limiting edge 29. The magnetic blocks are evenly distributed according to the fitting surface of the limiting edge 29. The magnetic blocks are adsorbed and connected to the ring sleeve 27. The PVC cup body reduces the weight. At the same time, the liquid collecting cup 28 is adsorbed and connected to the metal ring sleeve 27 by magnetic adsorption, which is convenient for disassembly and assembly. The liquid collecting cup 28 can be used to collect the concrete reinforcing liquid dripping during the spraying process, thereby avoiding waste of resources.

[0033] In summary, when the concrete is tested by the device, a concrete block 7 that matches the test groove 6 is first cut off and placed in the test groove 6, and the first hydraulic push rod 9 is started by the controller 5, and the clamping plate 10 is driven by the first hydraulic push rod 9 to clamp the concrete block 7, and an appropriate amount of concrete reinforcing liquid is injected into the liquid tank 11. During the test, the sensing point of the strain gauge 8 on the test piece 8 is brought into contact with the edges of both sides of the concrete block 7, and is bonded to the concrete block 7 by the adhesive strip 25 to ensure that the sensing point of the strain gauge 8 is in full contact with the concrete block, and the second hydraulic push rod 9 is started by the controller 5. The push rod 15 moves the detection component 4 to one end of the concrete block 7, and then the third hydraulic push rod 18 and the motor 20 on the equipment frame 17 are started through the controller 5. The motor 20 drives the second transmission wheel 23 through the first transmission wheel 22, so that the pressure wheel 19 rotates. The third hydraulic push rod 18 drives the equipment frame 17 to move, so that the rotating counter-rotating pressure wheel 19 contacts the surface of the concrete block 7. With the downward pressure of the third hydraulic push rod 18, an external force will be generated on the surface of the concrete block 7. The detection component 4 is driven to move by the second hydraulic push rod 15, so that it moves To the other end of the concrete block 7, during the movement, internal stress will be generated on the surface of the concrete block 7, and the sensing points on the strain gauge 8 will collect data and transmit it to the strain gauge 3 for presentation. If cracks appear on the surface of the concrete block 7, it means that the structure of the concrete block 7 does not meet the standard. If no cracks appear, the collected data can be used for analysis. After the first test is completed, the first hydraulic push rod 9 is started to release the clamping plate 10 from pressing the concrete block 7, and the concrete block 7 is taken out. The liquid collection cup 28 is embedded in the spray gun 13, and the liquid pump 12 is started. The liquid pump 12 pumps the reinforcing liquid in the liquid tank 11 through The spray gun 13 is sprayed to the other side of the concrete block 7. After the concrete is dried, it is placed in the detection tank 6 again. The above-mentioned detection method is used to detect one side of the concrete block 7 after spraying, and the detection data is collected. The data should be within the standard range of qualified concrete. By comparing the data with the previous data, the qualified rate of the concrete block 7 before spraying is determined. By comparison, it is known that the surface of the concrete block 7 without spraying strengthening will produce certain internal stress during detection, while the concrete block after spraying strengthening, the detection data will reach the standard qualified range, thereby eliminating the residual stress.

[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for detecting and eliminating residual stress in concrete, characterized in that: The invention comprises a detection device and an elimination device, wherein the detection device comprises a detection seat (1), a top seat (2), a strain gauge (3) and a detection assembly (4), wherein the detection seat (1) and the top seat (2) are connected via a bracket, wherein a controller (5) and a detection slot (6) are provided on the detection seat (1), wherein a concrete block (7) is embedded in the detection slot (6), wherein a detection sheet (8) is bonded to the concrete block (7), wherein pressing assemblies are provided on both sides of the detection seat (1), and wherein the detection sheet (8) is provided with a pressure-sensitive adhesive. Strain gauges (24) are distributed, and adhesive strips (25) are provided on both sides of the strain gauges (24). The strain gauges (3) are fixed to the top of the top seat (2). The strain gauges (3) are connected to the strain gauges (24) on the detection sheet (8) through lines passing through the top seat (2). A second hydraulic push rod (15) is fixed to one side of the top seat (2). A movable groove (14) is provided on the bottom surface of the top seat (2), and a movable seat (16) is embedded in the movable groove (14). The second The telescopic end of the hydraulic push rod (15) passes through the top seat (2) and is locked and fixed to the moving seat (16) by screws. The detection component (4) includes an equipment frame (17), a third hydraulic push rod (18) and a pressure wheel (19). The third hydraulic push rod (18) is locked and fixed to the moving seat (16) by screws. The telescopic end of the third hydraulic push rod (18) is locked and fixed to the equipment frame (17) by screws. A motor (20) is fixed on one side of the equipment frame (17) and a pressure wheel (19) is fixed on the other side. A connecting frame (21) is welded on the side, and a first transmission wheel (22) is connected to the connecting frame (21), one end of the first transmission wheel (22) is connected to the connecting frame (21) by rotating screws, and the other end is fixed to the transmission end of the motor (20) by screws, and the pressure wheel (19) is connected to the equipment frame (17) by rotating screws, and a second transmission wheel (23) is welded on the pressure wheel (19), and the second transmission wheel (23) is connected to the first transmission wheel (22) through a transmission belt; The elimination device comprises a liquid tank (11), a liquid pump (12) and a spray gun (13); the liquid tank (11) is injected with a concrete reinforcing agent; the liquid tank (11) and the liquid pump (12) are both fixed to one side of the top of the top seat (2) by screws; the liquid tank (11) is connected to the water inlet port of the liquid pump (12) by a rubber hose; and the water outlet port of the liquid pump (12) is connected to the spray gun (13) by a rubber hose.

2. A device for detecting and eliminating residual stress in concrete according to claim 1, characterized in that: The clamping assembly consists of a first hydraulic push rod (9) and a clamping plate (10), wherein the first hydraulic push rod (9) is fixed to both sides of the detection seat (1) by screws, and the clamping plate (10) is located on both sides of the detection groove (6), and the telescopic end of the first hydraulic push rod (9) passes through the side end of the detection seat (1) and is locked and fixed with the clamping plate (10) by screws, and a rubber gasket is bonded to the clamping surface of the clamping plate (10).

3. The device for detecting and eliminating residual stress in concrete according to claim 1, characterized in that: The controller (5) is provided with a control panel and a device interface, and the controller (5) is respectively connected to the first hydraulic push rod (9), the liquid pump (12), the second hydraulic push rod (15) and the motor (20) through lines.

4. A device for detecting and eliminating residual stress in concrete according to claim 1, characterized in that: The detection sheet (8) is bonded to both sides of the concrete block (7), through holes are distributed on both sides of the top seat (2), and the number of strain gauges (24) on the detection sheets (8) on both sides of the concrete block (7) is the same and they are connected to the strain gauge (3) through lines passing through the through holes distributed on both sides of the top seat (2).

5. The device for detecting and eliminating residual stress in concrete according to claim 1, characterized in that: The pressing wheel (19), the first transmission wheel (22) and the second transmission wheel (23) are all wheel bodies made of stainless steel, and the first transmission wheel (22) and the second transmission wheel (23) are of the same size and have corresponding positions.

6. A device for detecting and eliminating residual stress in concrete according to claim 1, characterized in that: The spray gun (13) is provided with a support rod (26), the support rod (26) is an "L" structure, one end of the support rod (26) is fixed to the bottom of the spray gun (13) nozzle by screws, and the other end is welded with a ring sleeve (27), and a liquid collecting cup (28) is embedded in the ring sleeve (27). The support rod (26) and the ring sleeve (27) are both made of metal material.

7. A device for detecting and eliminating residual stress in concrete according to claim 6, characterized in that: The liquid collecting cup (28) is a PVC cup body. A limiting edge (29) is provided at the cup mouth of the liquid collecting cup (28). Magnetic blocks are bonded to the fitting surface of the limiting edge (29). The magnetic blocks are evenly distributed along the fitting surface of the limiting edge (29). The magnetic blocks are adsorbed and connected to the ring sleeve (27).

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