A foundation pit deformation detection device and method

Abstract

The invention discloses a foundation pit deformation detection device and method, including a bracket, a detection device body is arranged on the bracket, the detection device body includes a substrate and a detection component, the substrate is in a rectangular frame shape, the detection component includes a fixed frame, a plurality of mutually parallel flexible marking members are arranged on the fixed frame, the flexible marking members are deformed under the action of external force and can mark horizontal and vertical marking lines in the area of ​​the inner wall of the foundation pit that is not concave and deformed after the external force is released, the horizontal and vertical marking lines intersect to form grid lines, an image acquisition device is arranged on the bracket, the image acquisition device transmits the image of the inner wall of the foundation pit to a controller, the controller calculates the blank area area according to the received image of the inner wall of the foundation pit and in combination with the grid lines, and the blank area area is compared with the threshold value of the concave deformation area to obtain the concave deformation degree of the side wall of the foundation pit. The structure of the invention is simple and practical, the detection process is concise, the detection range coverage is large, and the degree of concave deformation of the inner wall of the foundation pit can be effectively detected.

Description

Technical Field

[0001] The present invention relates to the technical field of foundation pit monitoring, and in particular to a foundation pit deformation detection device and method. Background Art

[0002] At present, foundation pit monitoring is an important link in foundation pit construction. It refers to various observations and analyses of changes in foundation pit rock and soil properties, support structure displacement and surrounding environmental conditions during foundation pit excavation and underground engineering construction. The monitoring results are fed back in a timely manner to predict the development of depression deformation and stable state caused by further construction, and to guide design and construction based on the predicted degree of impact of the construction on the surrounding environment.

[0003] Some invention patents in the field of foundation pit construction monitoring technology have been disclosed in the prior art. Among them, the invention patent with application number CN202110335996.1 discloses an automated deformation monitoring device for a subway foundation pit. The device's own position coordinates are calibrated through monitoring points, and the hydraulic mechanism is set to adjust the angle of the telescopic monitoring rod to determine the uplift height of the foundation pit. The deformation data of all detection points on the bottom of the foundation pit are measured and recorded, and then monitored through the detection mechanism.

[0004] However, there are the following problems: the overall structure is relatively complex, the detection process is not simple, the detection range of the entire equipment is relatively narrow, and it cannot play an effective role in detecting depression and deformation for foundation pits of construction. Summary of the invention

[0005] The object of the present invention is to provide a foundation pit deformation detection device and method. The detection device has a simple and practical structure, a concise detection process, a large detection range coverage, and can effectively detect the degree of depression and deformation of the inner wall of the foundation pit.

[0006] In order to solve the above technical problems, the present invention adopts the following solutions:

[0007] A foundation pit deformation detection device comprises a bracket installed in a foundation pit, a detection device body which is fitted with the inner wall of the foundation pit is provided on the bracket, the detection device body comprises a substrate which is fitted with the inner wall of the foundation pit, and a detection component which is detachably arranged on the substrate, the substrate is in the shape of a rectangular frame, the detection component comprises a fixing frame adapted to the substrate, a plurality of mutually parallel flexible marking members are arranged on the fixing frame at intervals along its length or width direction, the flexible marking members are deformed under the action of an external force and can mark horizontal marking lines and vertical marking lines in an area of ​​the inner wall of the foundation pit which is not concave and deformed after the external force is released, the horizontal marking lines and the vertical marking lines intersectingly form grid lines, an image acquisition device for shooting an image of the inner wall of the foundation pit after marking is also provided on the bracket, the image of the inner wall of the foundation pit comprises a grid area with grid lines and a blank area without grid lines, the image acquisition device transmits the image of the inner wall of the foundation pit to a controller, the controller calculates the area of ​​the blank area according to the received image of the inner wall of the foundation pit and in combination with the grid lines, the area of ​​the blank area is compared with a threshold value of the concave deformation area to obtain the degree of concave deformation of the side wall of the foundation pit.

[0008] Due to the adoption of the above technical scheme, the bracket is used as the basis of the entire detection device and is firmly installed in the foundation pit to ensure that subsequent components can work stably. The substrate is in the shape of a rectangular frame and fits tightly against the inner wall of the foundation pit to provide a stable installation platform for the detection component. The fixing frame is adapted to the substrate and is used to install flexible marking parts. The flexible marking parts are arranged at intervals along the length or width direction of the fixing frame. The marking parts can be deformed under the action of artificial external force and leave clear horizontal and vertical marking lines in the non-depressed and deformed area after the external force is released to form grid lines. The image acquisition device is installed on the bracket to capture the image of the inner wall of the foundation pit after marking. The image includes a grid area with grid lines and a blank area without grid lines. The controller receives the image of the inner wall of the foundation pit transmitted by the image acquisition device, identifies the grid lines and the blank area through image processing technology, and calculates the area of ​​the blank area. Subsequently, the area of ​​the blank area is compared with the preset depression deformation area threshold, thereby obtaining the depression deformation degree of the side wall of the foundation pit. The entire detection device has a simple and practical structure, a simple detection process, a large detection range coverage, and can effectively detect the depression deformation degree of the inner wall of the foundation pit.

[0009] Optionally, a horizontal telescopic cylinder is fixed on the bracket, the telescopic cylinder is perpendicular to the bracket, an output end of the telescopic cylinder is connected to a support rod, an end of the support rod away from the bracket is connected to a base plate, and the base plate is perpendicular to the support rod.

[0010] Optionally, the telescopic cylinders are distributed in a cross shape around the bracket.

[0011] Optionally, the flexible marking member includes a flexible tube, both ends of which are respectively connected to two opposite sides of the fixing frame, the surface of the flexible tube is wrapped with a water-absorbing layer, a plurality of through holes are opened on the side wall of the flexible tube along its length direction, and marking liquid is injected into the flexible tube, and the marking liquid is ink.

[0012] Optionally, the water-absorbing layer is made of nylon or cotton.

[0013] Optionally, the through holes are spirally arranged along the length direction of the flexible tube.

[0014] Optionally, one end of the flexible tube is connected to a fixed cylinder, which is movably connected to a fixed frame, an external thread is provided on the side wall of the fixed cylinder, a limiting nut is threadedly connected to the fixed cylinder, a rubber plug is provided at one end of the fixed cylinder away from the fixed frame, and marking liquid is injected into the fixed cylinder.

[0015] Optionally, the outer diameter of the flexible tube is 0.5 mm-2 mm.

[0016] Optionally, the four corners of the fixing frame are detachably connected to the base plate via bolts.

[0017] A method for detecting foundation pit deformation comprises the following steps:

[0018] S1: Install the bracket vertically at the center of the bottom wall of the foundation pit, and the telescopic cylinder driving base plate on the bracket fits with the inner walls of the four sides of the foundation pit;

[0019] S2: Install the detection component on the base plate by bolts;

[0020] S3: Pull the flexible marking member toward the center of the foundation pit and then release it. The flexible marking member contacts the inner wall of the foundation pit under the action of its rebound force, and marks a transverse marking line in the non-depressed area on the inner wall of the foundation pit. Then remove the detection component and install another suitable detection component. Similarly, pull the flexible marking member toward the center of the foundation pit and then release it. The flexible marking member contacts the inner wall of the foundation pit under the action of its rebound force, and marks a longitudinal marking line in the non-depressed area on the inner wall of the foundation pit. The transverse marking line and the longitudinal marking line intersect to form a grid line;

[0021] S4: The image acquisition device acquires the marked image of the inner wall of the foundation pit. The image of the inner wall of the foundation pit includes a grid area with grid lines and a blank area without grid lines. The image acquisition device transmits the image of the inner wall of the foundation pit to the controller. The controller calculates the area of ​​the blank area based on the received image of the inner wall of the foundation pit and in combination with the grid lines. The area of ​​the blank area is compared with the threshold of the depression deformation area. If the area of ​​the blank area is greater than the threshold, the depression deformation degree of the inner wall of the foundation pit does not meet the requirements and the foundation pit needs to be processed. If the area of ​​the blank area is less than the threshold, the depression deformation degree of the inner wall of the foundation pit meets the requirements.

[0022] The present invention has the beneficial effects:

[0023] In the present invention, after the detection component is installed, the flexible marking part can be deformed under the action of artificial external force, and after the external force is released, clear horizontal and vertical marking lines are left in the area that is not sunken and deformed, forming grid lines, and the sunken area is a blank area. The image acquisition device captures the image of the inner wall of the foundation pit after marking, and the image includes a grid area with grid lines and a blank area without grid lines. The controller receives the image of the inner wall of the foundation pit transmitted by the image acquisition device, identifies the grid lines and the blank area through image processing technology, and calculates the area of ​​the blank area. Subsequently, the area of ​​the blank area is compared with a preset depression deformation area threshold, so as to obtain the degree of depression deformation of the side wall of the foundation pit. The entire detection device has a simple and practical structure, a concise detection process, a large detection range coverage, and can effectively detect the degree of depression deformation of the inner wall of the foundation pit. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the present invention;

[0025] Figure 2 It is a schematic diagram of the structure of the detection component;

[0026] Figure 3 It is a schematic diagram of the assembly structure of the flexible pipe and the fixed cylinder;

[0027] Figure 4 It is a structural diagram of the distribution of through-hole sub-flexible pipes;

[0028] Figure 5 A schematic diagram of an image of the inner wall of a foundation pit acquired by an image acquisition device;

[0029] Figure 6 This is the distribution map of the depressions on the inner wall of the foundation pit.

[0030] Figure markings: 1- bracket, 2- image acquisition device, 3- telescopic cylinder, 4- base plate, 5- detection component, 501- fixed frame, 502- flexible marking member, 5021- flexible tube, 5022- water absorption layer, 5023- through hole, 6- inner wall of foundation pit, 7- fixed cylinder, 8- rubber plug, 9- grid line, 901- horizontal marking line, 902- vertical marking line, 10- image of inner wall of foundation pit, 11- limiting nut, 12- blank area, 13- support rod, 14- grid area. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below in conjunction with embodiments and drawings, but the embodiments of the present invention are not limited thereto.

[0032] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inside", "outside", "front", "back", "top", "bottom" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0033] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "disposed", "opened", "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] A foundation pit deformation detection device, comprising a bracket 1 installed in the foundation pit, a detection device body attached to the inner wall 6 of the foundation pit is provided on the bracket 1, the detection device body comprises a substrate 4 attached to the inner wall 6 of the foundation pit, and a detection component 5 detachably arranged on the substrate 4, the substrate 4 is in a rectangular frame shape, the detection component 5 comprises a fixing frame 501 adapted to the substrate 4, a plurality of mutually parallel flexible marking members 502 are arranged on the fixing frame 501 at intervals along its length or width direction, the flexible marking member 502 is deformed under the action of an external force and can mark a transverse mark on an area on the inner wall 6 of the foundation pit that is not concave and deformed after the external force is released Line 901 and longitudinal marking line 902, transverse marking line 901 and longitudinal marking line 902 intersect to form grid line 9, the bracket 1 is also provided with an image acquisition device 2 for photographing the marked foundation pit inner wall image 10, the foundation pit inner wall image 10 includes a grid area 14 with grid lines 9 and a blank area 12 without grid lines 9, the image acquisition device 2 transmits the foundation pit inner wall image 10 to the controller, the controller calculates the area of ​​the blank area 12 according to the received foundation pit inner wall image 10 and in combination with the grid lines 9, the area of ​​the blank area 12 is compared with the threshold value of the concave deformation area to obtain the degree of concave deformation of the foundation pit side wall.

[0035] Due to the adoption of the above technical solution, Figure 1As shown, the bracket 1 is the basis of the entire detection device and is firmly installed in the foundation pit to ensure that the subsequent components can work stably. The substrate 4 is in a rectangular frame shape and fits tightly with the inner wall 6 of the foundation pit to provide a stable installation platform for the detection component 5. The fixing frame 501 is adapted to the substrate 4 and is used to install the flexible marking member 502. The flexible marking member 502 is arranged at intervals along the length or width direction of the fixing frame 501. The marking member can be deformed under the action of artificial external force, and after the external force is released, a clear horizontal marking line 901 and a vertical marking line 902 are left in the non-deformed area to form a grid line 9. The image acquisition device 2 is installed on the bracket 1, as shown in FIG. Figure 5 As shown, it is used to capture the image 10 of the inner wall of the foundation pit after marking, and the image includes a grid area 14 with grid lines 9 and a blank area 12 without grid lines 9. The controller receives the image 10 of the inner wall of the foundation pit transmitted by the image acquisition device 2, identifies the grid lines 9 and the blank area 12 through image processing technology, and calculates the area of ​​the blank area 12. Subsequently, the area of ​​the blank area 12 is compared with a preset depression deformation area threshold, so as to obtain the depression deformation degree of the side wall of the foundation pit. The entire detection device has a simple and practical structure, a simple detection process, a large detection range coverage, and can effectively detect the depression deformation degree of the inner wall 6 of the foundation pit.

[0036] Working principle:

[0037] Installation and marking: First, firmly install the bracket 1 in the foundation pit, and fit the detection device body to the inner wall 6 of the foundation pit. Then the staff pulls the flexible marking member 502 toward the center of the foundation pit. After a certain degree of deformation, it is released. The flexible marking member 502 contacts the inner wall 6 of the foundation pit under the action of its rebound force, and marks the horizontal marking line 901 on the non-depressed area of ​​the inner wall 6 of the foundation pit. The depressed area cannot leave a marking line and is a blank area 12. Then remove the detection component 5, and install another suitable detection component 5. Similarly, pull the flexible marking member 502 toward the center of the foundation pit, and then release it. The flexible marking member 502 contacts the inner wall 6 of the foundation pit under the action of its rebound force, and marks the longitudinal marking line 902 on the non-depressed area of ​​the inner wall 6 of the foundation pit. The intersection of the horizontal marking line 901 and the longitudinal marking line 902 forms a grid line 9, as shown in FIG. Figure 6 As shown, the concave deformation to be detected by this scheme is generally not very obvious. It is not easy to see the obvious concave when observing from the front. The inconspicuous concave deformation has a small inward concave depth, so the area of ​​the blank area 12 is basically the plane area of ​​the area.

[0038] Image acquisition: Use an image acquisition device 2 (which may be a high-definition camera or a video camera) to capture the marked inner wall image 10 of the foundation pit, and ensure that the image is clear and contains complete grid lines 9 and blank areas 12.

[0039] Image processing and analysis: The collected image information is transmitted to the controller, which uses image processing technology to automatically identify the grid lines 9 and the blank areas 12. The area of ​​the blank area 12 is calculated and compared with the preset depression deformation area threshold to obtain the depression deformation degree of the foundation pit side wall.

[0040] Result output: The controller outputs the analysis results in an intuitive manner, such as displaying on a screen, printing reports or sending them to a remote monitoring system, so that relevant personnel can promptly understand the deformation of the foundation pit and take appropriate treatment measures.

[0041] Furthermore, a horizontal telescopic cylinder 3 is fixed on the bracket 1 , the telescopic cylinder 3 is perpendicular to the bracket 1 , an output end of the telescopic cylinder 3 is connected to a support rod 13 , an end of the support rod 13 away from the bracket 1 is connected to a base plate 4 , and the base plate 4 is perpendicular to the support rod 13 .

[0042] Specifically, the telescopic cylinder 3 is fixed on the bracket 1 and installed vertically with the bracket 1. Its main function is to adjust the distance and fit between the substrate 4 and the inner wall 6 of the foundation pit by controlling the extension and contraction of the cylinder. The support rod 13 is connected to the output end of the telescopic cylinder 3 and moves with the extension and contraction of the cylinder. The main function of the support rod 13 is to convert the linear motion of the cylinder into the position adjustment of the substrate 4 on the inner wall 6 of the foundation pit. The substrate 4 is connected to the end of the support rod 13 away from the bracket 1 and remains perpendicular to the support rod 13. In this way, when the telescopic cylinder 3 is extended and contracted, the substrate 4 can move in a direction perpendicular to the bracket 1 to better fit the inner wall 6 of the foundation pit.

[0043] Working principle:

[0044] Before starting the detection, the distance between the base plate 4 and the inner wall 6 of the foundation pit is adjusted by controlling the extension and retraction of the telescopic cylinder 3 to ensure that the base plate 4 can fit tightly against the inner wall 6 of the foundation pit to avoid affecting the accuracy of the detection due to a gap that is too large or too small. When the base plate 4 is adjusted to a suitable position, the locking function of the cylinder can be used to fix the base plate 4 on the inner wall 6 of the foundation pit. This can prevent the base plate 4 from moving or falling off during the detection process. If it is necessary to detect the deformation of the side wall of the foundation pit at different positions, the telescopic length of the telescopic cylinder 3 can be readjusted to move the base plate 4 to a new detection position. By introducing the telescopic cylinder 3 and the support rod 13, the foundation pit deformation detection device has been significantly improved in adapting to different foundation pit environments and improving detection accuracy. At the same time, this design is also easy to operate and maintain, thereby improving the efficiency and reliability of the entire detection process.

[0045] Furthermore, the telescopic cylinders 3 are distributed in a cross shape around the bracket 1 .

[0046] Specifically, the cross-shaped distribution of the telescopic cylinders 3 means that there are cylinders available on all sides of the bracket 1, so the position of the substrate 4 can be adjusted in all directions in the horizontal plane. This design makes it easier for the substrate 4 to fit the complex-shaped or inclined inner wall 6 of the foundation pit, thereby improving the accuracy of detection and detecting the degree of depression and deformation of the four side walls of the foundation pit.

[0047] Furthermore, the flexible marking member 502 includes a flexible tube 5021, both ends of which are respectively connected to two opposite sides of the fixing frame 501, the surface of the flexible tube 5021 is wrapped with a water-absorbing layer 5022, a plurality of through holes 5023 are opened on the side wall of the flexible tube 5021 along its length direction, and a marking liquid is injected into the flexible tube 5021, and the marking liquid is ink.

[0048] Specifically, Figure 2 and Figure 3As shown, the flexible tube 5021, as a carrier of the marking liquid, can be deformed when subjected to external force, and the marking liquid (ink) in the tube can be squeezed out through the through hole 5023 on the side wall, thereby leaving a clear marking line on the inner wall 6 of the foundation pit. The flexible tube 5021 should be made of a soft and elastic material to ensure that it can be smoothly deformed and restored to its original state under the action of external force. At the same time, the material should have good corrosion resistance and wear resistance to adapt to the complex environment in the foundation pit. The water-absorbing layer 5022 is wrapped on the surface of the flexible tube 5021. Its main function is to enhance the adhesion and diffusion effect of the marking liquid on the inner wall 6 of the foundation pit. When the marking liquid flows out of the flexible tube 50 When the ink is squeezed out from the through hole 5023 on the side wall of the flexible tube 5021, the water-absorbing layer 5022 can quickly absorb and diffuse the ink to form a clearer and continuous marking line. The water-absorbing layer 5022 should be made of a material with good water absorption and diffusion properties, which can quickly absorb and evenly distribute the ink to improve the marking effect. The through holes 5023 are opened on the side wall of the flexible tube 5021 and distributed along its length. The through holes 5023 are channels for the marking liquid to flow out of the flexible tube 5021. The number and distribution density of the through holes 5023 will affect the thickness and clarity of the marking line. By reasonably designing the number and distribution of the through holes 5023, the width and density of the marking line can be controlled to meet different detection accuracies. The design of the through hole 5023 should take into account factors such as the material and wall thickness of the flexible tube 5021 and the viscosity of the marking liquid. Generally speaking, the diameter of the through hole 5023 should not be too large or too small to prevent the marking liquid from flowing out too quickly or too slowly. At the same time, the distribution of the through holes 5023 should be uniform and dense to ensure that a continuous marking line can be formed when the flexible tube 5021 is deformed. The marking liquid (ink) is the key substance for forming the marking line. Its color, viscosity, drying speed and other characteristics will affect the marking effect. In this design, the marking liquid uses ink as its main component because ink has good adhesion and color stability and can form a clear mark on the inner wall 6 of the foundation pit. In order to form a clear and durable marking line, when selecting ink, factors such as color contrast, water resistance, weather resistance and environmental protection should be considered to ensure that the selected ink can form a clear marking line on the inner wall 6 of the foundation pit and will not cause harm to the environment and human body. The design of the flexible marking member 502 including a flexible tube 5021, a water absorption layer 5022 and a through hole 5023 enables the foundation pit deformation detection device to more accurately mark the deformation of the inner wall 6 of the foundation pit during the detection process. By reasonably controlling factors such as the material of the flexible tube 5021, the performance of the water absorption layer 5022 and the design of the through hole 5023, it can be ensured that the clarity and continuity of the marking line meet the detection requirements.

[0049] Furthermore, the water-absorbing layer 5022 is made of nylon or cotton.

[0050] Specifically, nylon material is a high-strength, wear-resistant synthetic fiber with excellent durability. As the water-absorbing layer 5022, nylon can maintain its shape and performance for a long time, and is not easy to be damaged or deformed, thereby ensuring the durability of the marking effect. The fiber structure of nylon is relatively tight, so its diffusion may not be as good as some looser materials. However, by adjusting factors such as the diameter and weaving density of the nylon fiber and the amount of hydrophilic agent added, its diffusion performance can be optimized so that the marking liquid is more evenly distributed on the inner wall 6 of the foundation pit. The nylon material has good chemical stability and weather resistance, and can resist chemical corrosion and temperature changes in the complex environment of the foundation pit. This helps to maintain the stability and reliability of the marking effect. The cotton material can quickly absorb and store a large amount of marking liquid (ink) while maintaining good diffusion performance, making the marking line clearer and continuous.

[0051] Furthermore, the through holes 5023 are spirally arranged along the length direction of the flexible tube 5021 .

[0052] Specifically, Figure 4 As shown, the spirally distributed through holes 5023 allow the marking liquid to gradually flow out along the spiral trajectory and can be better absorbed and stored by the water-absorbing layer 5022. Since the through holes 5023 are spirally distributed, even if the flexible tube 5021 is subjected to a large external force in a local area and undergoes a large deformation, the marking liquid will not flow out at a certain point to form an obvious breakpoint or thick line. On the contrary, it will be evenly distributed on the spiral trajectory, making the marking line more delicate and precise.

[0053] Furthermore, one end of the flexible tube 5021 is connected to a fixed tube 7, which is movably connected to the fixed frame 501. An external thread is provided on the side wall of the fixed tube 7, and a limiting nut 11 is threadedly connected to the fixed tube 7. A rubber plug 8 is provided at one end of the fixed tube 7 away from the fixed frame 501, and a marking liquid is injected into the fixed tube 7.

[0054] Specifically, Figure 2As shown, the movable connection enables the fixing tube 7 to adjust its position relative to the fixing frame 501 as needed, thereby changing the tightness of the flexible marking member 502, so as to better mark the grid lines 9 on the inner wall 6 of the foundation pit. The external thread on the side wall of the fixing tube 7 is used to achieve threaded connection with the limit nut 11. The contact length between the fixing tube 7 and the fixing frame 501 is accurately controlled by rotating the limit nut 11 or the fixing tube 7, thereby adjusting the tightness of the flexible marking member 502. The rubber plug 8 is located at the end of the fixing tube 7 away from the fixing frame 501, and is used to seal the fixing tube 7 and prevent To prevent the leakage of marking liquid, the marking liquid can be injected into the fixed cylinder 7 by piercing the rubber plug 8 with a needle. The material of the rubber plug 8 should have good sealing and corrosion resistance. The internal cavity of the fixed cylinder 7 is connected to the flexible tube 5021. Before the detection starts, an appropriate amount of marking liquid is injected into the fixed cylinder 7, and the fixed cylinder 7 is sealed by the rubber plug 8. At the same time, the fixed cylinder 7 is movably connected with the fixed frame 501 as needed, and the tightness of the flexible marking part 502 is adjusted. The limit nut 11 limits the position of the fixed cylinder 7 to avoid changes in the tightness of the flexible marking part 502.

[0055] Furthermore, the outer diameter of the flexible tube 5021 is 0.5 mm-2 mm.

[0056] Furthermore, the four corners of the fixing frame 501 are detachably connected to the base plate 4 via bolts.

[0057] A method for detecting foundation pit deformation comprises the following steps:

[0058] S1: The bracket 1 is vertically installed at the center of the bottom wall of the foundation pit, and the telescopic cylinder 3 on the bracket 1 drives the base plate 4 to fit with the inner walls of the four sides of the foundation pit;

[0059] S2: Install the detection assembly 5 on the base plate 4 by means of bolts;

[0060] S3: pull the flexible marking member 502 toward the center of the foundation pit and then release it. The flexible marking member 502 contacts the inner wall 6 of the foundation pit under the action of its rebound force, and marks a transverse marking line 901 on the non-depressed area of ​​the inner wall 6 of the foundation pit. Then remove the detection component 5 and install another suitable detection component 5. Similarly, pull the flexible marking member 502 toward the center of the foundation pit and then release it. The flexible marking member 502 contacts the inner wall 6 of the foundation pit under the action of its rebound force, and marks a longitudinal marking line 902 on the non-depressed area of ​​the inner wall 6 of the foundation pit. The transverse marking line 901 and the longitudinal marking line 902 intersect to form a grid line 9;

[0061] S4: The image acquisition device 2 acquires the marked image 10 of the inner wall of the foundation pit. The image 10 of the inner wall of the foundation pit includes a grid area 14 with grid lines 9 and a blank area 12 without grid lines 9. The side wall of the foundation pit is concave and deformed. The flexible marking member 502 cannot leave a marking line on its surface, so a blank area 12 is presented. The image acquisition device 2 transmits the image 10 of the inner wall of the foundation pit to the controller. The controller calculates the area of ​​the blank area 12 according to the received image 10 of the inner wall of the foundation pit and the grid lines 9. The number of blank areas 12 may be one or more. The sum of the areas of the blank areas 12 is the area of ​​the concave deformation area of ​​the inner wall 6 of the foundation pit, and is compared with the threshold of the concave deformation area. If the area of ​​the blank area 12 is greater than the threshold, the degree of concave deformation of the inner wall 6 of the foundation pit does not meet the requirements, and the foundation pit needs to be processed. If the area of ​​the blank area 12 is less than the threshold, the degree of concave deformation of the inner wall 6 of the foundation pit meets the requirements. If there is no blank area 12, it indicates that there is basically no concave deformation on the inner wall 6 of the foundation pit, and the quality of this kind of foundation pit is the best. The area calculation of the blank area 12 is based on the number of small grids it occupies, and the area of ​​each small grid is 1cm 2 Since the blank area 12 is an irregular ring, if it occupies more than half of the area of ​​a small grid, it is calculated according to the area of ​​a small grid. If it occupies less than half, it is calculated according to the area of ​​half a small grid.

[0062] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. According to the technical essence of the present invention, within the spirit and principles of the present invention, any simple modification, equivalent replacement and improvement made to the above embodiment still falls within the protection scope of the technical solution of the present invention.

Claims

1. A foundation pit deformation detection device, comprising a bracket (1) installed in a foundation pit, the bracket (1) being provided with a detection device body that is in contact with an inner wall (6) of the foundation pit, characterized in that: The detection device body comprises a substrate (4) attached to the inner wall (6) of the foundation pit, and a detection assembly (5) detachably arranged on the substrate (4); the substrate (4) is in the shape of a rectangular frame; the detection assembly (5) comprises a fixing frame (501) adapted to the substrate (4); a plurality of mutually parallel flexible marking members (502) are arranged at intervals along the length or width direction of the fixing frame (501); the flexible marking members (502) are deformed under the action of an external force and can mark a transverse marking line (901) and a longitudinal marking line (902) in an area on the inner wall (6) of the foundation pit that is not sunken and deformed after the external force is released; the transverse marking line (901) and the longitudinal marking line (902) are The marking lines (902) intersect to form grid lines (9); the bracket (1) is also provided with an image acquisition device (2) for photographing a marked foundation pit inner wall image (10); the foundation pit inner wall image (10) includes a grid area (14) with grid lines (9) and a blank area (12) without grid lines (9); the image acquisition device (2) transmits the foundation pit inner wall image (10) to a controller; the controller calculates the area of ​​the blank area (12) based on the received foundation pit inner wall image (10) and in combination with the grid lines (9); the area of ​​the blank area (12) is compared with a threshold value of the concave deformation area to obtain a concave deformation degree of the foundation pit side wall; A horizontal telescopic cylinder (3) is fixed on the support (1), the telescopic cylinder (3) is perpendicular to the support (1), the output end of the telescopic cylinder (3) is connected to a support rod (13), the end of the support rod (13) away from the support (1) is connected to a base plate (4), and the base plate (4) is perpendicular to the support rod (13); The flexible marking member (502) comprises a flexible tube (5021), two ends of the flexible tube (5021) are respectively connected to two opposite sides of the fixing frame (501), the surface of the flexible tube (5021) is coated with a water-absorbing layer (5022), a plurality of through holes (5023) are provided on the side wall of the flexible tube (5021) along its length direction, and a marking liquid is injected into the flexible tube (5021), and the marking liquid is ink.

2. A foundation pit deformation detection device according to claim 1, characterized in that: The telescopic cylinders (3) are distributed in a cross shape in the circumferential direction of the bracket (1).

3. A foundation pit deformation detection device according to claim 1, characterized in that: The water absorbing layer (5022) is made of nylon or cotton.

4. A foundation pit deformation detection device according to claim 1, characterized in that: The through holes (5023) are spirally arranged along the length direction of the flexible tube (5021).

5. The foundation pit deformation detection device according to claim 1, characterized in that: One end of the flexible tube (5021) is connected to a fixed cylinder (7), the fixed cylinder (7) is movably connected to the fixed frame (501), an external thread is provided on the side wall of the fixed cylinder (7), a limit nut (11) is threadedly connected to the fixed cylinder (7), a rubber plug (8) is provided at one end of the fixed cylinder (7) away from the fixed frame (501), and a marking liquid is injected into the fixed cylinder (7).

6. The foundation pit deformation detection device according to claim 1, characterized in that: The outer diameter of the flexible tube (5021) is 0.5 mm-2 mm.

7. The foundation pit deformation detection device according to claim 1, characterized in that: The four corners of the fixing frame (501) are detachably connected to the base plate (4) via bolts.

8. A method for using a foundation pit deformation detection device according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1: The support (1) is vertically mounted at the center of the bottom wall of the foundation pit, and the telescopic cylinder (3) on the support (1) drives the base plate (4) to fit the inner walls of the four sides of the foundation pit; S2: Installing the detection assembly (5) on the base plate (4) by means of bolts; S3: the flexible marking member (502) is pulled toward the center of the foundation pit and then released. The flexible marking member (502) contacts the inner wall (6) of the foundation pit under the action of its rebound force, and a transverse marking line (901) is marked on the non-depressed area of ​​the inner wall (6) of the foundation pit. The detection component (5) is then removed, and another suitable detection component (5) is installed. Similarly, the flexible marking member (502) is pulled toward the center of the foundation pit and then released. The flexible marking member (502) contacts the inner wall (6) of the foundation pit under the action of its rebound force, and a longitudinal marking line (902) is marked on the non-depressed area of ​​the inner wall (6) of the foundation pit. The transverse marking line (901) and the longitudinal marking line (902) intersect to form a grid line (9); S4: The image acquisition device (2) acquires the marked foundation pit inner wall image (10), the foundation pit inner wall image (10) including a grid area (14) with grid lines (9) and a blank area (12) without grid lines (9). The image acquisition device (2) transmits the foundation pit inner wall image (10) to the controller, and the controller calculates the area of ​​the blank area (12) based on the received foundation pit inner wall image (10) and in combination with the grid lines (9). The area of ​​the blank area (12) is compared with a threshold value of the concave deformation area. If the area of ​​the blank area (12) is greater than the threshold value, the degree of concave deformation of the foundation pit inner wall (6) does not meet the requirements and the foundation pit needs to be processed. If the area of ​​the blank area (12) is less than the threshold value, the degree of concave deformation of the foundation pit inner wall (6) meets the requirements.

Images