Wall internal stress detection system and detection method for project acceptance

Abstract

The invention discloses a wall internal stress detection system and method for project acceptance, and the system comprises a wall, a detection box, a control system and a first detection assembly, the wall is internally provided with a plurality of detection cavities in parallel, the first detection assembly is arranged in the detection cavities, and the first detection assembly comprises a detection air bag, a detection box and a connection header. The detection box is arranged in the detection cavity and attached to the inner wall of the detection cavity, the detection box comprises an installation frame and elastic plates, the elastic plates are arranged on the two opposite sides of the installation frame in parallel, the detection air bags are arranged in the detection box and abut against the inner walls of the elastic plates, and one end of the connecting header communicates with the detection air bags. And a plurality of strain gauges are arranged in the wall body, and the strain gauges and the air pressure detection structure are electrically connected with the control system. The method has the effect of accurately measuring the internal stress of the wall body.

Description

Technical Field

[0001] The present application relates to the technical field of building construction, and in particular to a wall internal stress detection system for project acceptance. Background Art

[0002] Internal stress refers to the stress that remains inside an object after the external load is removed. It is caused by uneven volume changes in the macroscopic or microscopic structure of the material. The internal stress of the wall is generally caused by changes in temperature, humidity, etc., especially in newly completed projects. The internal stress formed in the wall due to air drying often takes many years to be completely released. At the same time, due to seasonal changes, new internal stress will be formed in the wall. This internal stress needs to be monitored during the acceptance of the project to avoid safety hazards.

[0003] At present, sensors for detecting internal stress are usually placed inside the wall. When the internal stress of the wall changes, the internal stress of the wall is detected by the sensor.

[0004] With respect to the above-mentioned related technologies, the inventors believe that the above-mentioned wall internal stress detection method is not accurate enough to detect the wall internal stress only by relying on sensors during the detection process, and cannot achieve accurate detection of the wall expansion. Summary of the invention

[0005] In order to achieve accurate measurement of wall internal stress, the present application provides a wall internal stress detection system for project acceptance.

[0006] The wall internal stress detection system for project acceptance provided in this application adopts the following technical solution: A wall internal stress detection system for project acceptance includes a wall, a detection box, a control system and a first detection component. A plurality of detection cavities are opened in parallel in the wall. The first detection component is arranged in the detection cavity. The first detection component includes a detection airbag, a detection box and a connecting manifold. The detection box is arranged in the detection cavity and is arranged in contact with the inner wall thereof. The detection box includes a mounting frame and an elastic plate. The elastic plate is arranged in parallel on two opposite sides of the mounting frame. The detection airbag is arranged in the detection box and is pressed against the inner wall of the elastic plate. One end of the connecting manifold is connected to the detection airbag, and the other end is connected to an air pressure detection structure. A plurality of strain gauges are arranged inside the wall. The strain gauge and the air pressure detection structure are electrically connected to the control system.

[0007] By adopting the above technical solution, the detection airbag is set in the detection box. When the wall is deformed under the action of internal stress, the elastic plate is deformed and squeezes the detection airbag, and the air pressure inside the detection airbag changes. The operator detects the internal air pressure of the detection airbag through the air pressure detection structure. The strain gauge is set inside the wall to directly detect the internal stress inside the wall. Through the mutual cooperation of the wall, the detection box, the control system and the first detection component, the simultaneous comprehensive detection of the internal stress and internal expansion of the wall is achieved, which has the effect of realizing the accurate measurement of the internal stress of the wall.

[0008] Optionally, a second detection component is provided in the detection box, and the second detection component includes a first mounting plate, a second mounting plate, a metal strain gauge, a connecting wire and a detection circuit board. The first mounting plate and the second mounting plate correspond to and are connected to the inner walls of the two elastic plates one by one. One metal strain gauge is provided on the side where the first mounting plate and the second mounting plate are close to each other, and parts of the two metal strain gauges are overlapped and fitted with each other. One connecting wire is connected to each metal strain gauge, and the two connecting wires are connected to the detection circuit board, and the detection circuit board is electrically connected to the control system.

[0009] By adopting the above technical solution, the connecting wire, the detection circuit board and the metal strain gauge form a path. When the wall is deformed under the action of internal stress, the distance between the two elastic plates changes, and the relative positions of the two metal strain gauges change, resulting in changes in the resistance of the two metal strain gauges, thereby changing the current on the detection circuit board. The current value is combined with the air pressure value of the detection airbag to achieve accurate measurement of the expansion rate inside the wall.

[0010] Optionally, a plurality of detection airbags are arranged along the length direction of each detection box, a plurality of connecting branch pipes are arranged on the connecting manifold along the length direction, the plurality of connecting branch pipes correspond one-to-one to the plurality of detection airbags and are connected, a branch valve is arranged on the connecting branch pipe, and the branch valve is electrically connected to the control system.

[0011] By adopting the above technical solution, a plurality of detection airbags can simultaneously detect the internal expansion properties of different positions of the wall. According to actual needs, a specific branch valve is closed and the air pressure of a specific detection airbag is detected.

[0012] Optionally, two support frames are arranged in parallel in the wall, and the two support frames are respectively arranged on opposite sides of the detection cavity. The support frames include a plurality of staggered support cross bars and support longitudinal bars, and the strain gauge is arranged at the intersection of the support cross bars and the support longitudinal bars.

[0013] By adopting the above technical solution, the support frame supports the wall and realizes the positioning and installation of the strain gauge, which facilitates the detection of internal stress at different positions of the wall.

[0014] Optionally, a partition plate is connected to the detection box, and two partition plates are connected in parallel between two adjacent detection airbags. The second detection component is arranged between two adjacent detection airbags and between the two partition plates. A temperature sensor is provided in the detection box, and the temperature sensor is electrically connected to the control system.

[0015] By adopting the above technical solution, the partition plate separates the first detection component from the second detection component, avoiding the influence of the deformation of the detection airbag on the second detection component. The temperature sensor detects the temperature in the detection box and performs a comprehensive analysis in combination with the current value of the detection circuit board, thereby reducing the influence of temperature changes on the current value and facilitating a more accurate measurement of the internal expansion of the wall.

[0016] Optionally, a guide sleeve is connected to the side of the first mounting plate close to the second mounting plate, and the guide sleeve is sleeved on the outside of the metal strain gauge connected to the first mounting plate. The inner diameter of the guide sleeve is larger than the diameter of the metal strain gauge, and a guide ring is connected to the end of one of the metal strain gauges, and the guide ring is slidably sleeved on the outside of the other metal strain gauge.

[0017] By adopting the above technical solution, the guide sleeve and the guide ring limit and guide the movement of the metal strain gauge, thereby preventing the two metal strain gauges from separating during the sliding process and causing a circuit break.

[0018] Optionally, one end of the detection cavity is connected to the outside, one end of the detection box in the length direction is open, the open end of the detection box is detachably provided with a top cover, and the partition plate is detachably connected to the detection box.

[0019] By adopting the above technical solution, since the top cover plate is detachably connected to the detection box, the structure in the detection box can be replaced and repaired.

[0020] Optionally, the air pressure detection structure includes a U-shaped tube, which includes two vertical parts and a bending part connected between the bottom ends of the two vertical parts, one end of the connecting manifold is connected to the top end of one of the vertical parts, the U-shaped tube is filled with liquid, and the vertical tube is provided with scale lines along its length direction.

[0021] By adopting the above technical solution, the operator can intuitively detect the air pressure change in the detection airbag through the liquid level difference in the two vertical parts.

[0022] A method for detecting internal stress of a wall for project acceptance, characterized in that it comprises the following steps: S1: inject a certain amount of gas into the detection airbag so that the detection airbag is fitted with the elastic plates on both sides; S2: Observe the air pressure change inside the detection airbag through a barometer and convert the internal expansion degree into an air pressure value; S3: Close the specific branch valve and detect the air pressure change of the specific detection airbag to determine the specific position of the expansion in the wall.

[0023] In summary, the present application includes at least one of the following beneficial technical effects: 1. Through the cooperation of the wall, the detection box, the control system and the first detection component, the simultaneous comprehensive detection of the internal stress and internal expansion of the wall is realized, which has the effect of realizing the accurate measurement of the internal stress of the wall; 2. Several detection airbags are used to detect the internal expansion of different positions of the wall at the same time. According to actual needs, a specific branch valve is closed and the air pressure of a specific detection airbag is tested; 3. The second detection component converts the internal expansion of the wall into an electric current. The current value is combined with the air pressure value of the detection airbag to achieve a comprehensive and accurate measurement of the expansion rate inside the wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural schematic diagram of Example 1 of the present application, which is used to embody a wall internal stress detection system for project acceptance.

[0025] Figure 2 It is a partial cross-sectional view used to reflect the first detection component and the second detection component in Example 1 of the present application.

[0026] Figure 3 It is a partial cross-sectional view used to illustrate the support frame in Example 1 of the present application.

[0027] Figure 4 yes Figure 2 Enlarged view of part A in the middle.

[0028] Figure 5 yes Figure 2 Enlarged view of part B in the middle.

[0029] Figure 6 This is a schematic diagram of the structure of a wall internal stress detection system for project acceptance, which is used in Example 2 of the present application.

[0030] Explanation of the accompanying drawings: 1. wall; 101. detection cavity; 2. detection box; 21. top cover; 22. mounting frame; 23. elastic plate; 24. partition plate; 3. first detection component; 31. detection airbag; 32. connecting manifold; 33. connecting branch pipe; 34. branch valve; 35. gas pump; 36. main gas valve; 37. barometer; 38. U-shaped tube; 381. vertical portion; 382. bending portion; 383. scale line; 4. second detection component; 41. first mounting plate; 42. second mounting plate; 43. temperature sensor; 44. metal strain gauge; 45. guide sleeve; 46. guide ring; 47. connecting wire; 48. detection circuit board; 5. strain gauge; 6. support frame; 61. support cross bar; 62. support longitudinal bar. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-6 The present application is further described in detail. The present application provides a wall internal stress detection system for project acceptance, which has the effect of realizing accurate measurement of the internal stress of the wall 1 .

[0032] Example 1 Reference Figure 1-3 A wall internal stress detection system for project acceptance includes a wall 1, a detection box 2, a first detection component 3 and a second detection component 4. The top of the wall 1 is provided with a plurality of detection cavities 101 along the vertical direction, and the plurality of detection cavities 101 are located in the same vertical plane. A detection box 2 is provided in each detection cavity 101, and the vertical side walls and the bottom wall of the detection box 2 are fitted with the inner wall of the detection cavity 101. The detection box 2 includes a top cover plate 21, a mounting frame 22 and an elastic plate 23. The top of the detection box 2 is open, and the top cover plate 21 is connected to the top opening of the detection box 2 by bolts. An elastic plate 23 is connected to the opposite sides of the mounting frame 2, and the elastic plate 23 is fitted with the inner wall of the detection cavity 101.

[0033] Reference Figure 2 , Figure 4 and Figure 5The first detection assembly 3 is arranged in the detection box 2, and the first detection assembly 3 includes a detection airbag 31, a connecting manifold 32, a connecting branch pipe 33, a branch valve 34, an air pump 35 and a main air valve 36. Several detection airbags 31 are arranged in the detection box 2 along its length direction, and the detection airbags 31 are filled with gas, so that the detection airbags 31 are arranged in contact with the inner side of the elastic plate 23. A connecting branch pipe 33 is connected and arranged on each detection airbag 31, and a branch valve 34 is arranged on each connecting branch pipe 33. The connecting manifold 32 is connected and connected with several connecting branch pipes 33 at the same time. One end of the connecting manifold 32 is closed, and the other end is connected and connected with the air pump 35. The connecting manifold 32 is connected and arranged with an air pressure detection structure. The air pressure detection structure in this embodiment is a barometer 37, and the barometer 37 is connected and arranged on the connecting manifold 32. A main air valve 36 is arranged between the barometer 37 and the air pump 35.

[0034] Reference Figure 2 and Figure 3 A partition plate 24 is provided in the detection box 2, and the partition plate 24 is provided along the width direction of the detection box 2. Two partition plates 24 are provided in parallel between two adjacent detection airbags 31. A connecting ear plate is vertically provided on the edge of the partition plate 24, and the connecting ear plate is connected to the inner wall of the detection box 2 by bolts.

[0035] Reference Figure 2 and Figure 4 The second detection component 4 is located between two adjacent detection airbags 31 and between two partition plates 24. The second detection component 4 includes a first mounting plate 41, a second mounting plate 42, a temperature sensor 43, a metal strain gauge 44, a guide sleeve 45, a guide ring 46, a connecting wire 47 and a detection circuit board 48. The first mounting plate 41 and the second mounting plate 42 correspond to and are connected to the inner walls of the two elastic plates 23 one by one. The first mounting plate 41 and the second mounting plate 42 are both made of insulating material. A metal strain gauge 44 is vertically arranged on the side where the first mounting plate 41 and the second mounting plate 42 are close to each other, and parts of the two metal strain gauges 44 overlap and fit each other. A connecting wire 47 is connected to the end of each metal strain gauge 44 away from each other, and the end of the connecting wire 47 away from the metal strain gauge 44 is connected to the detection circuit board 48, and the detection circuit board 48 is electrically connected to the control system.

[0036] Reference Figure 2 and Figure 4A guide sleeve 45 is sleeved on the outside of the metal strain gauge 44 connected to the first mounting plate 41. The length of the guide sleeve 45 is less than that of the metal strain gauge 44. One end of the guide sleeve 45 is vertically connected to the first mounting plate 41. A guide ring 46 is connected to the end of the metal strain gauge 44 on the first mounting plate 41. The guide ring 46 is sleeved on another metal strain gauge 44. The guide ring 46 and the guide sleeve 45 are both made of insulating materials. A temperature sensor 43 is provided in the detection box 2.

[0037] Reference Figure 3 Two support frames 6 are arranged in parallel in the wall 1, and the support frames 6 include a plurality of support cross bars 61 and a plurality of support longitudinal bars 62. The support cross bars 61 and the support longitudinal bars 62 are arranged alternately and connected, and a strain gauge 5 is connected to each of the connection positions of the support cross bars 61 and the support longitudinal bars 62. When the wall 1 is manufactured, a plurality of detection boxes 2 and two support frames 6 are placed at specific positions in the mold of the wall 1, and concrete is poured into the mold of the wall 1 to form the wall 1.

[0038] Reference Figure 2 , Figure 3 and Figure 5 , the air delivery pump 35 injects a certain amount of gas into the detection airbag 31, so that the detection airbag 31 is arranged in close contact with the elastic plates 23 on both sides. When the wall 1 is deformed under the action of internal stress, the elastic plate 23 is deformed and squeezes the detection airbag 31, causing the air pressure in the detection airbag 31 to change. The barometer 37 converts the slight deformation of the wall 1 into a specific air pressure change, which is convenient for the operator to observe the internal expansion rate of the wall 1. In order to determine which part of the wall 1 has undergone a larger deformation, the specific branch valve 34 can be closed to detect the air pressure change of the specific detection airbag 31.

[0039] Reference Figure 3 and Figure 4At the same time, when the wall 1 is deformed, the distance between the two elastic plates 23 changes, and the two metal strain gauges 44, the connecting wires 47 and the detection circuit board 48 form a path and generate a current of a specific value. When the distance between the elastic plates 23 changes, the two metal strain gauges 44 slide relative to each other, resulting in a change in the resistance of the two metal strain gauges 44. The change in the resistance of the metal strain gauge 44 causes the current of the detection circuit board 48 to change. According to the change in the current value, a comprehensive analysis is made on the deformation degree of the wall 1, and combined with the air pressure value of the detection airbag 31, the expansion inside the wall 1 is accurately detected. The setting of the guide sleeve 45 and the guide ring 46 realizes the limiting guidance of the two metal strain gauges 44, avoiding the possibility of the two metal strain gauges 44 being separated when the two slide relative to each other. The setting of the partition plate 24 realizes the separation of the first detection component 3 and the second detection component 4, avoiding the possibility of the detection airbag 31 interfering with the second detection component 4 when it is squeezed and enlarged. Since the partition plate 24 and the top cover plate 21 are detachably connected to the detection box 2, it is convenient for operators to repair and replace the structure in the detection box 2. The setting of the temperature sensor 43 realizes the real-time detection of the temperature in the detection box 2, and combines the current size on the detection circuit board 48 to realize the detection of expansion, reducing the influence of temperature on the resistance value of the metal strain gauge 44.

[0040] Reference Figure 2 and Figure 3 The support frame 6 supports the wall 1 , and a plurality of strain gauges 5 simultaneously detect the internal stress at various positions inside the wall 1 , thereby achieving accurate detection of the internal stress and expansion of the wall 1 at the same time.

[0041] The implementation principle of a wall internal stress detection system for project acceptance in Example 1 of the present application is as follows: the air pump 35 injects gas into the detection airbag 31, so that the detection airbag 31 fits with the elastic plate 23. When the wall 1 is deformed, the detection airbag 31 is squeezed, resulting in a change in air pressure. At the same time, when the wall 1 is deformed, the distance between the two elastic plates 23 changes, resulting in a change in the resistance of the two metal strain gauges 44. According to the current value and the air pressure value of the detection airbag 31, the expansibility of the wall 1 is accurately detected. The support frame 6 supports the wall 1, and a number of strain gauges 5 simultaneously detect the internal stress of various positions inside the wall 1, thereby achieving accurate detection of the internal stress and expansibility of the wall 1 at the same time.

[0042] Example 2 Reference Figure 4The air pressure detection structure in the present application includes a U-shaped tube 38, which includes two vertical parts 381 and a bending part 382 connected between the bottoms of the two vertical parts 381. The vertical parts 381 are provided with scale lines 383 along their length. The top of one of the vertical parts 381 is connected to the connecting manifold 32, and the U-shaped tube 38 is filled with liquid.

[0043] The implementation principle of a wall internal stress detection system for project acceptance in Example 2 of the present application is: when detecting the air pressure in the detection airbag 31, the liquid level height in the two vertical parts 381 will change when the air pressure changes, which makes it convenient for the operator to intuitively observe the air pressure changes of the detection airbag 31.

[0044] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A wall internal stress detection system for project acceptance, characterized by: The invention comprises a wall (1), a detection box (2), a control system and a first detection component (3); a plurality of detection cavities (101) are parallelly opened in the wall (1); the first detection component (3) is arranged in the detection cavity (101); the first detection component (3) comprises a detection airbag (31), a detection box (2) and a connecting manifold (32); the detection box (2) is arranged in the detection cavity (101) and is arranged in contact with the inner wall thereof; the detection box (2) comprises a mounting frame (22) and an elastic plate (23), one elastic plate (23) is arranged in parallel on both sides of the mounting frame (22), the detection airbag (31) is arranged in the detection box (2) and is pressed against the inner wall of the elastic plate (23), one end of the connecting manifold (32) is connected to the detection airbag (31), and the other end is connected to an air pressure detection structure, a plurality of strain gauges (5) are arranged inside the wall (1), and the strain gauges (5) and the air pressure detection structure are electrically connected to the control system.

2. A wall internal stress detection system for project acceptance according to claim 1, characterized in that: The detection box (2) is provided with a second detection component (4), the second detection component (4) comprising a first mounting plate (41), a second mounting plate (42), a metal strain gauge (44), a connecting wire (47) and a detection circuit board (48), the first mounting plate (41) and the second mounting plate (42) correspond to and are connected to the inner walls of the two elastic plates (23) one by one, one of the metal strain gauges (44) is provided on a side where the first mounting plate (41) and the second mounting plate (42) are close to each other, parts of the two metal strain gauges (44) are overlapped and arranged, one connecting wire (47) is connected to each of the metal strain gauges (44), the two connecting wires (47) are connected to the detection circuit board (48), and the detection circuit board (48) is electrically connected to the control system.

3. A wall internal stress detection system for project acceptance according to claim 2, characterized in that: A plurality of the detection airbags (31) are arranged along the length direction of each detection box (2); a plurality of connecting branch pipes (33) are arranged on the connecting manifold (32) along the length direction; the plurality of connecting branch pipes (33) correspond to and are connected to the plurality of the detection airbags (31) one by one; a branch valve (34) is arranged on the connecting branch pipe (33); and the branch valve (34) is electrically connected to the control system.

4. A wall internal stress detection system for project acceptance according to claim 1, characterized in that: Two support frames (6) are arranged in parallel in the wall (1), and the two support frames (6) are respectively arranged on two opposite sides of the detection cavity (101), and the support frame (6) includes a plurality of staggered support cross bars (61) and support longitudinal bars (62), and the strain gauge (5) is arranged at the intersection of the support cross bars (61) and the support longitudinal bars (62).

5. A wall internal stress detection system for project acceptance according to claim 3, characterized in that: The detection box (2) is connected to a partition plate (24), two of the partition plates (24) are connected in parallel between two adjacent detection airbags (31), the second detection component (4) is arranged between the two adjacent detection airbags (31) and between the two partition plates (24), and the detection box (2) is provided with a temperature sensor (43), and the temperature sensor (43) is electrically connected to the control system.

6. A wall internal stress detection system for project acceptance according to claim 2, characterized in that: A guide sleeve (45) is connected to one side of the first mounting plate (41) close to the second mounting plate (42), and the guide sleeve (45) is sleeved on the outside of the metal strain gauge (44) connected to the first mounting plate (41). The inner diameter of the guide sleeve (45) is larger than the diameter of the metal strain gauge (44), and a guide ring (46) is connected to the end of one of the metal strain gauges (44), and the guide ring (46) is slidably sleeved on the outside of the other metal strain gauge (44).

7. A wall internal stress detection system for project acceptance according to claim 5, characterized in that: One end of the detection chamber (101) is connected to the outside, one end of the detection box (2) in the length direction is open, a top cover plate (21) is detachably provided at the open end of the detection box (2), and the partition plate (24) is detachably connected to the detection box (2).

8. A wall internal stress detection system for project acceptance according to claim 1, characterized in that: The air pressure detection structure comprises a U-shaped tube (38), the U-shaped tube (38) comprises two vertical parts (381) and a bent part (382) connected between the bottom ends of the two vertical parts (381), one end of the connecting manifold (32) is connected to the top end of one of the vertical parts (381), the U-shaped tube (38) is filled with liquid, and the vertical tube is provided with scale lines (383) along its length direction.

9. A method for detecting internal stress of a wall for project acceptance according to claim 7, characterized in that: The following steps are involved: S1: injecting a certain amount of gas into the detection airbag (31) so that the detection airbag (31) is arranged in close contact with the elastic plates (23) on both sides; S2: observing the air pressure change inside the detection airbag (31) by means of a barometer, and converting the internal expansion degree into an air pressure value; S3: Close the specific branch valve (34) and detect the air pressure change of the specific detection airbag (31) to determine the specific position of the expansion in the wall.

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