A deep foundation pit deformation detection method and device based on BIM technology

Abstract

The present invention belongs to the field of deep foundation pit deformation detection, and specifically relates to a deep foundation pit deformation detection device, comprising baffles arranged on two inner walls of a foundation pit, a horizontally arranged support shaft arranged between the two baffles, two symmetrically arranged telescopic components arranged at both ends of the support shaft, the telescopic components comprising a sliding shaft, both ends of the support shaft are provided with sliding cavities, the sliding shaft is slidably arranged in the sliding cavity, one end of the sliding shaft is universally connected to the baffles, and the other end is connected to the support shaft through an elastic mechanism, a displacement detection device for detecting the displacement of the sliding shaft is arranged in the sliding cavity, and inclinometers are also arranged on both sides of the foundation pit, which has the beneficial effects of real-time detection of the deformation state of the foundation pit, visual monitoring and alarm when exceeding a threshold value.

Description

Technical Field

[0001] The present invention belongs to the field of deep foundation pit deformation detection, and specifically relates to a deep foundation pit deformation detection method and device based on BIM technology. Background Art

[0002] The excavation of deep foundation pits is a dynamic process. Affected by various complex factors, it is difficult to predict possible problems based on existing theories. Once the support structure is unevenly stressed, the soil will tilt at best, and the foundation pit will collapse at worst. The excavation of the foundation pit also poses a hidden danger to the safety of surrounding buildings. If the surrounding soil becomes unstable, it is likely to cause the destruction of the upper structure and bring adverse social impacts. Therefore, monitoring the foundation pit is an indispensable part of foundation pit construction. At present, foundation pit monitoring is mainly manual monitoring, and most of the monitoring uses instruments such as total stations, levels, and inclinometers. The monitoring workload is large, and there are human errors due to factors such as weather, personnel, and on-site conditions. Various technical parameters cannot be monitored in real time, and the summary and analysis are delayed, making it difficult to grasp the problems and risks in the project in a timely manner, all of which affect the safety production and management level of the project. Summary of the invention

[0003] The purpose of the present invention is to provide a deep foundation pit deformation detection method and device based on BIM technology for real-time detection of foundation pit deformation state, visual monitoring and alarm when exceeding threshold value. To achieve the above-mentioned purpose of the invention, the technical solution adopted by the present invention is:

[0004] A deep foundation pit deformation detection device comprises baffles arranged on two inner walls of the foundation pit, a horizontally arranged support shaft is arranged between the two baffles, and two symmetrically arranged telescopic components are arranged at both ends of the support shaft;

[0005] The telescopic assembly includes a sliding shaft, both ends of the support shaft are provided with sliding cavities, the sliding shaft is slidably arranged in the sliding cavity, one end of the sliding shaft is universally connected to the baffle, and the other end is connected to the support shaft through an elastic mechanism, and a displacement detection device for detecting the displacement of the sliding shaft is arranged in the sliding cavity;

[0006] Inclinometers are also provided on both sides of the foundation pit.

[0007] Furthermore, the elastic mechanism includes a spring arranged in the sliding cavity, one end of the spring abuts against the inner wall of the sliding cavity, and the other end acts on the sliding shaft.

[0008] Furthermore, one end of the spring close to the sliding shaft is sleeved on the slider and abuts against the connecting ring, the connecting ring is fixedly sleeved on the slider, the connecting ring is adapted to the sliding cavity, and there is a gap between the inner wall of one end of the sliding cavity away from the slider and the slider, and the displacement detection device is arranged on the slider.

[0009] Furthermore, the elastic mechanism also includes a rotating sleeve sleeved on the support shaft, the rotating sleeve is connected to the support shaft by a thread, a side surface of the support shaft is provided with a sliding groove connected to the sliding cavity, a connecting block is provided in the sliding groove, one end of the connecting block is fixedly connected to the outer side surface of the connecting ring, and the other end is fixedly connected to the inner side surface of the limiting ring, the limiting ring is sleeved on the support shaft, and the outer side surface of the limiting ring is provided with a limiting mechanism for connecting the rotating sleeve to compress the spring when the rotating sleeve rotates.

[0010] Furthermore, the limiting mechanism includes a gripping rod, a notch portion is provided on the inner side of one end of the rotating sleeve close to the limiting ring, the notch portion is adapted to the limiting ring, one end of the gripping rod passes through the side of the rotating sleeve and is provided in the notch portion, and an annular groove adapted to the end of the gripping rod is provided on the outer side of the limiting ring, and the gripping rod is used to be inserted into the annular groove to form an axial limitation on the limiting ring.

[0011] Furthermore, the rotating sleeve is arranged between the limiting rings on the two telescopic components, and a threaded hole is arranged on the side of the rotating sleeve away from the limiting ring. The threaded hole is arranged concentrically with the support shaft, and a threaded ring threadedly connected to the threaded hole is fixedly arranged on the outer side of the support shaft.

[0012] Furthermore, two symmetrical supporting mechanisms are provided at both ends of the supporting shaft, and the supporting mechanisms include a second annular groove provided on the end face of the supporting shaft, a supporting plate is provided in the second annular groove, the supporting plate extends out of the second annular groove and is fixedly connected to one end of a connecting rod, and the other end of the connecting rod is connected to an embedded part, and the embedded part is provided on the inner wall of the foundation pit and is located above the baffle.

[0013] Furthermore, the support sheet has an arc-shaped structure.

[0014] Furthermore, connecting mechanisms are provided at both ends of the support shaft, and the connecting mechanisms include a semicircular groove provided at the end of the sliding shaft, a sphere is provided in the semicircular groove, and a detachable connecting cover plate is provided on the end face of the sliding shaft, and the cover plate is provided with a through hole with a diameter smaller than the sphere, and the inner wall of the through hole is an arc surface structure adapted to the sphere, a part of the sphere extends out of the through hole and is fixedly connected to a fixing rod, and the fixing rod is detachably connected to the baffle.

[0015] A deep foundation pit deformation detection method based on BIM technology includes the following steps:

[0016] S1. Construction preparation;

[0017] S2, BIM model of the pre-modeled foundation pit;

[0018] S3. Installation and construction of foundation pit and detection equipment;

[0019] S4: The displacement detection device detects the horizontal span of the foundation pit, and the inclination device detects the inclination. The two transmit the data to the data center via wireless. The data center modifies the BIM model based on the data to obtain the actual foundation pit BIM model;

[0020] S5. Set alarm thresholds for the horizontal span and inclination of the BIM model of the foundation pit. If the thresholds are exceeded, the data center will sound an alarm.

[0021] The present invention has the following beneficial effects: by measuring the displacement of the sliding shaft when sliding and the inclination of the soil layer on the side of the foundation pit through the displacement detection device, the changes in the horizontal span and inclination of the foundation pit can be obtained in real time, so that the deformation of the deep foundation pit can be known in real time, and the measurement data can be subsequently imported into the BIM modeling software to form a BIM model to intuitively reflect the deformation. Compared with the prior art, the beneficial effect of real-time detection of the deformation state of the foundation pit is achieved, and the elastic mechanism has an extrusion effect on the wall of the foundation pit, providing a certain pre-tightening force and stabilizing the foundation pit structure. In addition, the rotation of the rotating sleeve is achieved by rotating the grip rod, and at the same time, the slider compression spring is pushed to shorten the horizontal length of the two sliding shafts, thereby facilitating the hoisting thereof into the foundation pit, achieving the effect of easy installation, and combining the sliding shaft detection data measured by the displacement detection device with BIM modeling to realize the functions of visual monitoring and exceeding the threshold value alarm. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the telescopic component;

[0024] Figure 3 for Figure 2 A schematic cross-sectional view in the aa direction;

[0025] Figure 4 It is a schematic diagram of the spring being compressed;

[0026] Figure 5 for Figure 1 The enlarged schematic diagram at A in the middle;

[0027] Figure 6 for Figure 5 Schematic diagram of the cross-section along the bb axis. DETAILED DESCRIPTION

[0028] The following will be combined with the attached embodiment of the present invention Figure 1-6, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Unless otherwise specified, the technical means used in the embodiments are conventional means well known to those skilled in the art.

[0029] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0030] A deep foundation pit deformation detection device, comprising baffles 2 arranged on two inner walls of a foundation pit 1, a horizontally arranged support shaft 3 is arranged between the two baffles 2, and two symmetrically arranged telescopic components are arranged at both ends of the support shaft 3;

[0031] The telescopic assembly includes a sliding shaft 4, both ends of the support shaft 3 are provided with sliding cavities, the sliding shaft 4 is slidably arranged in the sliding cavity, one end of the sliding shaft 4 is universally connected to the baffle 2, and the other end is connected to the support shaft 3 through an elastic mechanism 5, and a displacement detection device 10 for detecting the displacement of the sliding shaft 4 is arranged in the sliding cavity;

[0032] Inclinometers 8 are also provided on both sides of the foundation pit 1 .

[0033] like Figure 1 The baffle 2 is of prior art and is fixed on two opposite walls in the foundation pit 1. The support shaft 3 is located at a relatively upper position of the baffle 2. The sliding cavity is a blind hole structure. When the sliding shaft 4 slides, the elastic mechanism 5 is compressed. After the support shaft 3 is installed in place, the elastic mechanism 5 is in a compressed state, so the sliding shaft 4 has an extrusion effect on the wall of the foundation pit 1, providing a certain preload force and stabilizing the structure of the foundation pit 1.

[0034] The displacement detection device 10 is a prior art, and can be a rangefinder, a laser rangefinder or various sensors with a distance measuring function, such as a displacement sensor, a photoelectric sensor, etc. The present invention adopts a photoelectric sensor, whose transmitting end is installed on the inner wall surface of the end of the sliding cavity away from its opening, and the receiving end is installed at the end of the sliding shaft 4 located in the sliding cavity. When the sliding shaft 4 is displaced, it can be detected in time. The inclinometer 8 is a prior art, which is used to measure the inclination of the soil layers on both sides of the foundation pit 1. The present invention adopts a guide wheel fixed inclinometer, which has the characteristics of long-term automatic measurement. Two inclinometers 8 are provided, which are located in the soil layers on both sides of the foundation pit 1, and the two baffles 2 are located between the two inclinometers 8.

[0035] When both sides of the foundation pit 1 tilt, the universal connection between the end of the sliding shaft 4 and the baffle 2 keeps the support shaft 3 always in a horizontal state, ensuring that the data measured by the inclinometer 8 is always the horizontal span of the foundation pit 1.

[0036] The present invention measures the displacement of the sliding shaft 4 when it slides and the inclination of the soil layer on the side of the foundation pit 1 through the displacement detection device 10, and then the changes in the horizontal span and inclination of the foundation pit 1 can be obtained in real time, so the deformation of the deep foundation pit can be known in real time. The measurement data can be subsequently imported into the BIM modeling software to form a BIM model to intuitively reflect the deformation. Compared with the existing technology, the beneficial effect of real-time detection of the deformation state of the foundation pit is achieved, and the elastic mechanism 5 has a squeezing effect on the wall of the foundation pit 1, providing a certain preload force, and stabilizing the structure of the foundation pit 1.

[0037] Furthermore, the elastic mechanism 5 includes a spring 505 disposed in the sliding cavity, one end of the spring 505 abuts against the inner wall of the sliding cavity, and the other end acts on the sliding shaft 4.

[0038] Furthermore, one end of the spring 505 close to the sliding shaft 4 is sleeved on the slider 501 and abuts against the connecting ring 502. The connecting ring 502 is fixedly sleeved on the slider 501. The connecting ring 502 is adapted to the sliding cavity. There is a gap between the inner wall of one end of the sliding cavity away from the slider 501 and the slider 501. The displacement detection device 10 is arranged on the slider 501.

[0039] Specifically, Figure 2 The transmitting end of the photoelectric sensor is installed on the end surface of the slider 501 located on one end of the spring 505, and the receiving end is spaced apart from the transmitting end.

[0040] Furthermore, the elastic mechanism 5 also includes a rotating sleeve 506 sleeved on the support shaft 3, the rotating sleeve 506 is connected to the support shaft 3 by a thread, the side of the support shaft 3 is provided with a sliding groove 510 connected to the sliding cavity, a connecting block 503 is provided in the sliding groove 510, one end of the connecting block 503 is fixedly connected to the outer side surface of the connecting ring 502, and the other end is fixedly connected to the inner side surface of the limiting ring 504, the limiting ring 504 is sleeved on the support shaft 3, and the outer side surface of the limiting ring 504 is provided with a limiting mechanism for connecting the rotating sleeve 506, so as to compress the spring 505 when the rotating sleeve 506 rotates.

[0041] The slide groove 510 is a square hole structure, which provides an axial limit for the movement of the connecting block 503 . The limit ring 504 is concentrically arranged with the rotating sleeve 506 .

[0042] The rotating sleeve 506 is a component used when installing the entire device. During installation, the rotating sleeve 506 is connected to the limiting ring 504 through a limiting mechanism. During the rotation of the rotating sleeve 506, the limiting ring 504 moves and the spring 505 is compressed. The spring 505 is compressed to the minimum stroke, forming a Figure 4 In the state, the sliding shaft 4 is spaced apart from the slider 501 in the horizontal direction, so the horizontal length of the two sliding shafts 4 is shortened and is less than the distance between the two baffles 2. The ends of the sliding shafts 4 are spaced apart from the baffles 2. Therefore, the support shaft 3 can be hoisted into the foundation pit 1 by a sling, and then the constraint of the rotating sleeve 506 on the limiting ring 504 is released by the limiting mechanism. During the process of the spring 505 resetting, the sliding shaft 4 is pushed to squeeze the baffle 2 to form a pre-tightened structure.

[0043] Furthermore, the limiting mechanism includes a gripping rod 508, and a notch portion 509 is provided on the inner side of one end of the rotating sleeve 506 close to the limiting ring 504, and the notch portion 509 is adapted to the limiting ring 504. One end of the gripping rod 508 passes through the side of the rotating sleeve 506 and is provided in the notch portion 509, and the outer side surface of the limiting ring 504 is provided with an annular groove adapted to the end of the gripping rod 508, and the gripping rod 508 is used to be inserted into the annular groove to form an axial limitation on the limiting ring 504.

[0044] Specifically, the gripping rod 508 is connected to the rotating sleeve 506 by a threaded connection, and the gripping rod 508 can be inserted into the notch 509 by rotating it. During installation, the gripping rod 508 is first rotated in the circumferential direction of the rotating sleeve 506 to make the notch 509 cover the limiting ring 504, and then the gripping rod 508 is rotated again to make the end of the gripping rod 508 inserted into the annular groove, and then the gripping rod 508 is rotated in the circumferential direction again to push the slider 501 to compress the spring 505, so as to form a Figure 4 The support shaft 3 is then hoisted into the foundation pit 1 by a hoist. In addition, when the rotating sleeve 506 is rotated, the support shaft 3 is kept relatively fixed by the hoist to avoid self-rotation.

[0045] Furthermore, the rotating sleeve 506 is arranged between the limiting rings 504 on the two telescopic components, and a threaded hole is arranged on the side of the rotating sleeve 506 away from the limiting ring 504. The threaded hole is arranged concentrically with the support shaft 3, and a threaded ring 507 threadedly connected to the threaded hole is fixedly arranged on the outer side of the support shaft 3.

[0046] like Figure 2In the process of rotating the rotating sleeve 506, the threaded connection between it and the threaded ring 507 is used to push the slider 501 to compress the spring 505. In addition, an intermediate ring 511 is also provided on the support shaft 3. The intermediate ring 511 is fixedly connected to the support shaft 3. The two sides of the intermediate ring 511 are respectively fixedly connected to the threaded rings 507 on the two telescopic components. The threaded hole is in the structure of an annular groove and is concentric with the rotating sleeve 506. The threaded part is arranged on the wall surface of the annular groove.

[0047] In addition, in the circumferential direction of the support shaft 3, a plurality of gripping rods 508 and connecting blocks 503 are arranged in an annular array.

[0048] The present invention drives the rotating sleeve 506 to rotate by rotating the gripping rod 508, and at the same time pushes the slider 501 to compress the spring 505, so that the horizontal lengths of the two sliding shafts 4 are shortened, thereby facilitating the lifting thereof into the foundation pit 1, thereby facilitating installation.

[0049] Furthermore, two symmetrical supporting mechanisms are provided at both ends of the support shaft 3, and the supporting mechanisms include a second annular groove provided on the end surface of the support shaft 3, a supporting plate 11 is provided in the second annular groove, the supporting plate 11 extends out of the second annular groove and is fixedly connected to one end of the connecting rod 7, and the other end of the connecting rod 7 is connected to the embedded part 9, and the embedded part 9 is provided on the inner wall of the foundation pit 1 and is located above the baffle 2.

[0050] Furthermore, the support sheet 11 is in an arc-shaped structure.

[0051] The embedded part 9 is a prior art, which is arranged between the top of the baffle 2 and the top of the foundation pit 1. The connecting rod 7 is arranged obliquely, and its top can be connected to the embedded part 9 by means of screws, fasteners, etc.

[0052] like Figure 6 The second annular groove, the support shaft 3 and the support sheet 11 are concentrically arranged. Through the connection of the connecting rod 7 and the support of the support sheet 11, the limiting effect of the support shaft 3 is achieved, so that the axis is always kept horizontal. The arc structure of the support sheet 11 increases the support area and strength.

[0053] Furthermore, connecting mechanisms 6 are also provided at both ends of the support shaft 3, and the connecting mechanisms 6 include a semicircular groove arranged at the end of the sliding shaft 4, a sphere 601 is arranged in the semicircular groove, and a detachable connecting cover plate 602 is provided on the end face of the sliding shaft 4, and the cover plate 602 is provided with a through hole with a diameter smaller than the sphere 601, and the inner wall of the through hole is an arc surface structure adapted to the sphere 601, a part of the sphere 601 extends out of the through hole and is fixedly connected to a fixing rod 603, and the fixing rod 603 is detachably connected to the baffle 2.

[0054] like Figure 5 The semicircular groove is a hemispherical groove structure. The cover plate 602 is connected to the end face of the sliding shaft 4 by screws. The cover plate 602 forms a limiting mechanism to clamp the ball 601 in the semicircular groove. Under the limitation of the fixing rod 603, the ball 601 can perform universal rotation within a certain range. Since the inclination change range of the foundation pit 1 is usually not large, it can be adapted to the present invention.

[0055] Specifically, a fixing seat 604 is provided on the baffle 2 , and one end of the fixing rod 603 away from the sphere 601 is inserted into the fixing seat 604 and connected to the fixing seat 604 by screws.

[0056] When installing the support shaft 3, first install the sphere 601 and the fixing rod 603 on the fixing seat 604, then hang the support shaft 3 into the foundation pit, align the spherical groove and the sphere 601, then rotate the rotating sleeve 506, and finally install the support plate 11 and the connecting rod 7.

[0057] A deep foundation pit deformation detection method based on BIM technology includes the following steps:

[0058] S1. Construction preparation;

[0059] S2, BIM model of pre-modeled foundation pit 1;

[0060] S3, installation and construction of foundation pit 1 and detection equipment;

[0061] S4, the horizontal span of the foundation pit 1 detected by the displacement detection device 10, and the inclination detection device 8 detects the inclination, and the two transmit the data to the data center via wireless, and the data center modifies the BIM model according to the data to obtain the actual BIM model of the foundation pit 1;

[0062] S5. Set alarm thresholds for the horizontal span and inclination of the BIM model of foundation pit 1. When the thresholds are exceeded, the data center will alarm.

[0063] Specifically, the BIM model is a centralized display platform for foundation pit excavation, project monitoring, safety status tracking and surrounding environment monitoring. It is presented in the BIM software in the existing technology. In order to achieve the visualization requirements of the safety status of deep foundation pits, in the process of creating the foundation pit BIM model, the foundation pit retaining structure and measuring points are split into basic parts to form a BIM sub-model library for foundation pit monitoring projects.

[0064] The displacement detection device 10 and the inclinometer 8 are connected to the wireless node, and the data is uploaded to the data center of the cloud platform through the wireless transmission module built into the cloud gateway. The database is based on the BIM model and achieves seamless integration with the BIM model through data conversion interface adaptation and data fusion technology. Through the visual interface of the BIM model, users can easily access information records during foundation pit construction and monitoring, and realize marking and tracking in spatial and temporal dimensions for monitoring data that exceeds the pre-alarm threshold.

[0065] The entire BIM technology includes functions such as data center, data analysis, alarm control, statistical information, engineering information and system management.

[0066] Data Center: Based on the Internet, Internet of Things and automatic collection technology, it realizes the real-time collection, processing and transmission of dynamic data of deep foundation pit construction; it automatically publishes the three-layer monitoring results of data summary table, sub-item report (daily, weekly and monthly report) and measuring point curve, so that users can understand the project information, monitoring alarm, monitoring data, monitoring curve, on-site working conditions, project positioning and other information of the project.

[0067] The monitoring results of the displacement detection device 10 and the inclinometer 8 are embedded in the BIM three-dimensional lightweight model, and the three-dimensional visualization of the deformation history of the foundation pit excavation is performed in combination with the foundation pit construction conditions, including time-displacement curve analysis, depth-displacement curve analysis and comparative analysis of the two monitoring data.

[0068] Alarm control: According to the alarm rules, yellow, orange and red level pre-alarm events are automatically generated and issued, including monitoring alarm, patrol alarm, comprehensive alarm and frequency alarm, so as to achieve the closed-loop management of alarm events of "reminder - disposal - control - elimination"; according to the measurement specifications, regular reminders and statistics are provided for each monitoring project to ensure the timeliness of the data.

[0069] Statistical information: Statistics of red, orange and yellow level 3 alarm events of the construction party and the third party, number and basic information of monitoring sections and measuring points, personnel information and data upload volume of each line, section, work point and monitoring type.

[0070] Project information: Maintain the basic information of deep foundation pit projects, including monitoring type, monitoring section, measuring points, pre-alarm threshold, personnel involved in alarm handling, measuring point status correction, BIM model and manuals for operators.

[0071] Alarm: The deep foundation pit safety monitoring information system based on BIM technology takes deep foundation pits as the application object, implants the monitoring results of the foundation pit and the surrounding environment into the system, and combines it with the construction conditions of the deep foundation pit to display the full coupling of various monitoring control points with the deformation process of the foundation pit excavation, the depth of the foundation pit and the deformation and other related indicators; it realizes the distributed management of deep foundation pit safety monitoring data through the computer Internet, which greatly facilitates the management and analysis of monitoring data by management and technical personnel at all levels, quickly, effectively and accurately judges the safety status of deep foundation pits, and guides the subsequent construction of deep foundation pit projects.

[0072] In addition, the present invention can implant detection devices such as surface settlement, groundwater level, pile top horizontal displacement, pile top vertical displacement, steel support axial force, concrete support axial force, deep horizontal displacement of pile body, and working shaft clearance convergence in the prior art around the foundation pit 1 to achieve all-round detection.

[0073] The embodiments described above are only descriptions of the preferred modes of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations, modifications, and substitutions made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A deep foundation pit deformation detection device, comprising baffles (2) arranged on two inner walls of a foundation pit (1), characterized in that: A horizontally arranged support shaft (3) is arranged between the two baffles (2), and two symmetrically arranged telescopic components are arranged at both ends of the support shaft (3); The telescopic assembly comprises a sliding shaft (4), both ends of the support shaft (3) are provided with sliding cavities, the sliding shaft (4) is slidably arranged in the sliding cavity, one end of the sliding shaft (4) is universally connected to the baffle (2), and the other end is connected to the support shaft (3) via an elastic mechanism (5), and a displacement detection device (10) for detecting the displacement of the sliding shaft (4) is arranged in the sliding cavity; Inclinometers (8) are also provided on both sides of the foundation pit (1); the elastic mechanism (5) comprises a spring (505) arranged in the sliding cavity, one end of the spring (505) abuts against the inner wall of the sliding cavity, and the other end acts on the sliding shaft (4); the end of the spring (505) close to the sliding shaft (4) is sleeved on the sliding block (501) and abuts against the connecting ring (502); the connecting ring (502) is fixedly sleeved on the sliding block (501); the connecting ring (502) is adapted to the sliding cavity; the inner wall of the sliding cavity at one end away from the sliding block (501) is in contact with the sliding block (501), the displacement detection device (10) is arranged on the slider (501); the elastic mechanism (5) also includes a rotating sleeve (506) sleeved on the support shaft (3), the rotating sleeve (506) is connected to the support shaft (3) by means of a thread, a sliding groove (510) connected to the sliding cavity is arranged on the side of the support shaft (3), a connecting block (503) is arranged in the sliding groove (510), one end of the connecting block (503) is fixedly connected to the outer side surface of the connecting ring (502), and the other end is fixedly connected to the inner side surface of the limiting ring (504), the limiting ring (504) is connected to the inner side surface of the limiting ring (504) by means of a threaded connection. A positioning ring (504) is sleeved on the support shaft (3); a positioning mechanism for connecting the rotating sleeve (506) is arranged on the outer side surface of the positioning ring (504) so ​​as to compress the spring (505) when the rotating sleeve (506) rotates; the positioning mechanism comprises a gripping rod (508); a notch (509) is arranged on the inner side of one end of the rotating sleeve (506) close to the positioning ring (504); the notch (509) is adapted to the positioning ring (504); one end of the gripping rod (508) passes through the side surface of the rotating sleeve (506) and is arranged in the notch (509). 09), the outer side surface of the limit ring (504) is provided with an annular groove adapted to the end of the gripping rod (508), and the gripping rod (508) is used to be inserted into the annular groove to form an axial limit for the limit ring (504); the rotating sleeve (506) is arranged between the limit rings (504) on the two telescopic components, and the side of the rotating sleeve (506) away from the limit ring (504) is provided with a threaded hole, the threaded hole is arranged concentrically with the support shaft (3), and the outer side surface of the support shaft (3) is fixedly provided with a threaded ring (507) threadedly connected to the threaded hole.

2. A deep foundation pit deformation detection device according to claim 1, characterized in that: Two symmetrically arranged support mechanisms are provided at both ends of the support shaft (3), the support mechanism comprising a second annular groove provided on the end surface of the support shaft (3), a support sheet (11) provided in the second annular groove, the support sheet (11) extending out of the second annular groove and fixedly connected to one end of a connecting rod (7), the other end of the connecting rod (7) being connected to an embedded part (9), the embedded part (9) being provided on the inner wall of the foundation pit (1) and located above the baffle (2).

3. A deep foundation pit deformation detection device according to claim 2, characterized in that: The supporting sheet (11) has an arc-shaped structure.

4. A deep foundation pit deformation detection device according to claim 1, characterized in that: The two ends of the support shaft (3) are also provided with a connecting mechanism (6), the connecting mechanism (6) comprising a semicircular groove provided at the end of the sliding shaft (4), a sphere (601) provided in the semicircular groove, a detachable connecting cover plate (602) at the end face of the sliding shaft (4), the cover plate (602) being provided with a through hole having a diameter smaller than that of the sphere (601), the inner wall of the through hole being in an arc surface structure adapted to the sphere (601), a part of the sphere (601) extending out of the through hole and being fixedly connected to a fixing rod (603), the fixing rod (603) being detachably connected to the baffle (2).

5. A method for detecting deformation of a deep foundation pit using the deep foundation pit deformation detection device according to any one of claims 1 to 4, characterized in that: The following steps are included: S1. Construction preparation; S2, BIM model of the pre-modeled foundation pit (1); S3, installation and construction of foundation pit (1) and detection equipment; S4, the displacement detection device (10) detects the horizontal span of the foundation pit (1), and the inclination measurement device (8) detects the inclination, and the two transmit the data to the data center via wireless. The data center modifies the BIM model based on the data to obtain the actual BIM model of the foundation pit (1); S5. Set alarm thresholds for the horizontal span and inclination of the BIM model of the foundation pit (1). When the thresholds are exceeded, the data center will sound an alarm.

Images