An adaptive transverse inner support, intelligent early warning system and early warning method for deep foundation pit steel sheet pile

Abstract

This invention relates to an adaptive lateral internal support, intelligent early warning system, and early warning method for sheet piles in deep foundation pits. Symmetrical side support structures are installed on the inner wall of the foundation pit, with supporting structures and climbing structures between these symmetrical side support structures. The intelligent early warning system's data acquisition subsystem collects the strain of the sheet piles and the jacking force of the thrust jacks and structural jacks. The data analysis subsystem analyzes the stress on the sheet piles. The early warning subsystem provides timely warnings when the stress on the sheet piles exceeds limits. The intelligent correction subsystem adjusts the position and thrust of the supporting structures. The early warning method effectively combines structural stress monitoring with intelligent technology, achieving stress early warning and intelligent correction for sheet piles in deep foundation pits. This promotes the intelligent development of safe construction of sheet pile support structures and lateral internal supports in deep foundation pits, improving the construction safety of foundation pit support.

Description

Technical Field

[0001] This invention relates to an adaptive lateral internal support, intelligent early warning system and early warning method for steel sheet piles in deep foundation pits, belonging to the field of construction of steel sheet piles in deep foundation pits. Background Technology

[0002] In recent years, with the continuous development of underground engineering and the increasing number of deep foundation pit projects, the country has attached great importance to the safety of deep foundation pit support, investing significant manpower and resources to ensure its protection. In deep foundation pit construction, insufficient support structure strength, unreasonable support system design, and neglect of on-site monitoring are the main causes of accidents. In 2016, during the excavation of a building's foundation pit to the bottom, the maximum horizontal displacement of the soil towards the inside of the pit exceeded the safety limit. The following day, cracks appeared in the support piles, the connection between the steel supports and the support piles twisted, and localized ground subsidence occurred outside the support piles, threatening the personal safety of construction workers. Therefore, only by improving the monitoring of the support structure and the lateral internal support devices and methods can safety be effectively improved.

[0003] Currently, research on intelligent adjustable lateral internal bracing devices and safety early warning systems for deep foundation pit steel sheet piles is relatively scarce, and the level of intelligent analysis is insufficient. Steel sheet pile support is prone to safety issues. When abnormal deformation or other safety problems occur in deep foundation pit steel sheet pile support structures, the traditional method is to use a retaining method, adding various steel sheet piles and internal bracing; adding steel sheet piles and connecting them with broken piles can prevent further collapse of the soil behind the piles, thus preventing endangerment of surrounding buildings; adding internal bracing can reduce the internal forces and horizontal deformation of the support structure. Although this approach is relatively quick to implement, it cannot immediately and promptly remedy dangerous situations, and it is detrimental to the safety of workers erecting the retaining structure. It also cannot achieve adaptive adjustment of the internal bracing, ultimately affecting the safety of the entire deep foundation pit work area and the workers. Therefore, it is necessary to monitor and adjust the performance of steel sheet piles and lateral internal bracing in a timely manner to ensure the safety of construction personnel.

[0004] With the development of monitoring methods and intelligent technologies, the monitoring methods for strain and other parameters of deep foundation pit sheet pile support structures are constantly improving. However, current monitoring of support structures can only grasp the stress state of the sheet piles and cannot be linked with the adaptive adjustment of the lateral internal bracing. Therefore, it is necessary to use intelligent methods to improve the original fixed lateral internal bracing device into an adaptive lateral internal bracing that can change the jacking force and the position of action. This adaptive lateral internal bracing can be integrated with the stress state of the sheet piles and intelligent algorithms to achieve adaptive adjustment and intelligent early warning of the lateral internal bracing of deep foundation pit sheet piles, thereby solving the safety problems in deep foundation pit construction. Summary of the Invention

[0005] This invention provides an adaptive lateral internal bracing, intelligent early warning system, and early warning method for steel sheet piles in deep foundation pits, enabling the safe construction of steel sheet pile support structures and lateral internal bracing in deep foundation pits to move towards intelligent development and improving the construction safety of foundation pit support.

[0006] The technical solution adopted by this invention to solve its technical problem is:

[0007] An adaptive lateral internal bracing for steel sheet piles in deep foundation pits is provided, wherein symmetrical side support structures are set on the inner wall of the foundation pit, and support structures and climbing structures are set between the symmetrical side support structures.

[0008] The side support structure includes steel sheet piles, which are installed in close contact with the inner wall of the foundation pit. Strain gauges are covered on the surface of the steel sheet piles, and toothed racks are installed on the outside of the strain gauges.

[0009] The climbing structure includes a transmission gear, an I-beam, and a structural jack. Each side support structure has a rack matched with a transmission gear. The center of the transmission gear is connected to the motor shaft of the transmission motor. The transmission motor is mounted on the corresponding I-beam. A structural jack is installed between the ends of two adjacent I-beams, and the lifting direction of the structural jack is perpendicular to the inner wall of the pit.

[0010] The supporting structure includes external thrust steel and thrust jacks. Each I-beam is fitted with an external thrust steel, and a thrust jack is installed between the ends of two adjacent external thrust steels. The lifting direction of the thrust jacks is perpendicular to the inner wall of the pit.

[0011] The external thrust steel and the I-beam are connected by internal and external connecting devices;

[0012] An intelligent early warning system for adaptive lateral internal bracing of sheet piles in deep foundation pits includes a data acquisition subsystem, a data analysis subsystem, an early warning subsystem, and an intelligent correction subsystem.

[0013] The data acquisition subsystem includes a strain gauge and a thrust gauge. The strain gauge is connected to the strain gauge, and the thrust gauge is connected to the thrust jack and the structural jack.

[0014] The data analysis subsystem includes a data caching module and a computing unit. The data acquisition subsystem transmits the acquired data to the data caching module, and the computing unit analyzes the data and plots graphs.

[0015] The early warning subsystem includes an early warning module, an instruction distribution module, and a PC terminal. The PC terminal displays the curves drawn by the data analysis subsystem and issues early warnings through the early warning module. The instruction distribution module sends the early warning information to the safety warning lights at the construction site.

[0016] The intelligent correction subsystem includes a correction module, which sends adjustment commands to the drive motor and thrust jacks based on the early warning information, adjusting the position of the climbing structure and the thrust of the thrust jacks in the support structure.

[0017] The early warning method of the intelligent early warning system for adaptive lateral internal bracing of steel sheet piles in deep foundation pits specifically includes the following steps:

[0018] Step S1: Install the structure. Sequentially install sheet piles, strain gauges, and racks on the inner wall of the foundation pit to form a side support structure. Install structural jacks between the ends of two adjacent I-beams and thrust jacks between the ends of two adjacent external thrust steels. Install internal and external connecting devices between the external thrust steels and the I-beams. Install a drive motor on the I-beams. The motor shaft of the drive motor is inserted into the center of the drive gear, and the drive gear meshes with the rack.

[0019] Step S2: Data acquisition and analysis. Connect the strain acquisition instrument to the strain gauge, and the thrust acquisition instrument to the thrust jack and structural jack. Acquire the corresponding strain and thrust data, and transmit the strain and thrust data to the data analysis subsystem. The calculation unit of the data analysis subsystem calculates the stress distribution of the steel sheet pile based on the data and the material properties of the steel sheet pile, and plots the stress curve of the steel sheet pile along the depth direction.

[0020] Step S3: Emergency Warning. The obtained stress of the sheet pile is compared with the preset safety limit of sheet pile stress. If it exceeds the preset safety limit of sheet pile stress, the warning information is pushed to the warning subsystem. The warning module of the warning subsystem receives the warning message and displays the warning information in the construction site management system on the PC through the instruction distribution module. The location of the incident is marked, and the safety warning lights at the construction site are lit to promptly notify the construction personnel to evacuate.

[0021] Step S4: Intelligent correction. The intelligent correction subsystem receives the early warning information, analyzes the stress curve of the sheet pile, and sends adjustment commands to the drive motor and thrust jacks to adjust the position of the climbing structure and the thrust of the thrust jacks in the support structure.

[0022] As a further preferred embodiment of the present invention, the intelligent correction in step S4 specifically includes the following steps:

[0023] Step S41: Assuming the lateral pressure of the foundation pit remains constant, calculate and analyze the thrust of the increased thrust jack, analyze the stress change of the sheet pile, obtain the thrust value that can improve the stress condition of the sheet pile, and send a command from the correction module to control the thrust of the thrust jack to reach the calculated value.

[0024] Step S42: Assuming the soil lateral pressure in the foundation pit remains constant, calculate and analyze the stress position of the external thrust steel, analyze the stress position of the support structure when the integral of the absolute stress value along the depth direction is the minimum, and the correction module sends a command to control the drive motor. The drive motor drives the drive gear to move the support structure to the calculated position.

[0025] As a further preferred embodiment of the present invention, in step S42, the specific steps of the transmission motor driving the transmission gear to move the external thrust steel to the calculated position are as follows: assuming that the soil side pressure of the foundation pit and the thrust of the thrust jack remain unchanged, calculate the actual stress function f(x,y), where x is the position from the top of the sheet pile into the foundation pit along the depth direction, and y is the position of the support structure from the top of the sheet pile into the foundation pit.

[0026] Taking the absolute value of the stress function f(x,y) and integrating it along the depth direction from 0 to depth h, we obtain F(y):

[0027]

[0028] Find the minimum value of F(y) and take its derivative so that its derivative is 0:

[0029]

[0030] For all y whose derivative is 0 i The minimum F(y) was obtained through verification; the y value at this point is the optimal load distribution position Y of the support structure.

[0031] Y:minF(y)

[0032] Substituting the optimal support structure load location Y into f(x,y), we obtain the stress function f(x,Y) of the sheet pile along the depth direction;

[0033] The maximum stress of the sheet pile is F(x):

[0034]

[0035] Verify whether F(x) meets the safety limit. If it does, move the support structure to the calculated position; if it does not, additional edge support structures need to be added to the inner support at that location.

[0036] By employing the above technical solutions, the present invention has the following beneficial effects compared to the prior art:

[0037] 1. The adaptive lateral internal support for steel sheet piles in deep foundation pits provided by the present invention consists of a support structure and a climbing structure set between symmetrically arranged side support structures. The support structure is the main thrust structure, and the support structure provides thrust to form a climbing structure, thus forming an adaptive lateral internal support that can move and adjust the thrust magnitude.

[0038] 2. The adaptive lateral internal bracing for deep foundation pit steel sheet piles provided by this invention, when combined with an intelligent early warning system, can efficiently realize adaptive adjustment and intelligent early warning during the construction of deep foundation pit steel sheet piles, greatly improving the safety and efficiency of lateral internal bracing during current deep foundation pit construction.

[0039] 3. The adaptive lateral internal support, intelligent early warning system and early warning method for steel sheet piles in deep foundation pits provided by this invention can quickly detect and locate dangerous areas when any slight change occurs in the side support structure, thus enabling the safe construction of the side support structure and support structure of deep foundation pits to develop towards intelligentization. Attached Figure Description

[0040] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0041] Figure 1 This is an overall layout diagram of the adaptive lateral internal support and intelligent early warning system for steel sheet piles in deep foundation pits provided by the present invention.

[0042] Figure 2 This is an end cross-sectional view of the support structure and climbing structure provided by the present invention;

[0043] Figure 3 This is a top view of the support structure and climbing structure provided by the present invention;

[0044] Figure 4 This is the overall flowchart of the early warning method provided by the present invention.

[0045] In the diagram: 1 is a sheet pile, 2 is a strain gauge, 3 is a rack, 4 is a strain acquisition instrument, 5 is a thrust acquisition instrument, 6 is a thrust jack, 7 is a structural jack, 8 is an I-beam, 9 is an external thrust steel, 10 is an internal and external connection device, 11 is a drive motor, 12 is a drive gear, 13 is a data cache module, 14 is a calculation unit, 15 is an early warning module, 16 is an instruction distribution module, 17 is a PC terminal, 18 is a correction module, and 19 is a safety warning light. Detailed Implementation

[0046] The present invention will now be described in further detail with reference to the accompanying drawings. In the description of this application, it should be understood that the terms "left side," "right side," "upper part," "lower part," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and 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 orientation, or be constructed and operated in a specific orientation. "First," "second," etc., do not indicate the importance of the components, and therefore should not be construed as a limitation of the present invention. The specific dimensions used in this embodiment are only for illustrating the technical solution and do not limit the scope of protection of the present invention.

[0047] As described in the background section, current monitoring of edge support structures can only grasp the stress state of sheet piles and cannot be linked with the adaptive adjustment of lateral internal bracing. Therefore, this application aims to provide an adaptive lateral internal bracing for sheet piles in deep foundation pits. It is a structure that can change the jacking force and the position of action. When combined with an intelligent early warning system, it can monitor and grasp the stress state of sheet piles in real time using intelligent means. At the same time, this application also provides a related early warning method. By integrating the stress state of sheet piles obtained from monitoring with intelligent algorithms, the adaptive adjustment and intelligent early warning of the lateral internal bracing of sheet piles in deep foundation pits can be realized, which greatly improves the safety of deep foundation pit construction.

[0048] The following details the various structures, systems, and methods. First, there is the adaptive lateral internal support for sheet piles in deep foundation pits. Symmetrical side support structures are set on the inner wall of the foundation pit. The side support structure includes sheet piles 1, which are set in close contact with the inner wall of the foundation pit. Strain gauges 2 are covered on the surface of the sheet piles, and racks 3 are set on the outside of the strain gauges. Support structures and climbing structures are set between the symmetrically set side support structures. The support structure here is the main thrust structure. The support structure provides thrust to form the climbing structure, thus forming an adaptive lateral internal support that can move and adjust the magnitude of the thrust.

[0049] Figures 2-3 As shown, the climbing structure includes a transmission gear 12, an H-beam 8, and a structural jack 7. Each side support structure's rack is matched with a transmission gear, the center of which is connected to the motor shaft of a transmission motor 11. The transmission motor is mounted on the corresponding H-beam. A structural jack is installed between the ends of two adjacent H-beams, and the lifting direction of the structural jack is perpendicular to the inner wall of the pit. The support structure includes an external thrust steel 9 and a thrust jack 6. An external thrust steel is fitted over each H-beam, and a thrust jack is installed between the ends of two adjacent external thrust steels, with the lifting direction of the thrust jack perpendicular to the inner wall of the pit. The external thrust steel and the H-beam are connected by an internal and external connecting device 10. The transmission motor and transmission gear enable the H-beam to move on the rack of the sheet pile to achieve the supporting position of the support structure. The thrust of the support structure can be changed by the structural jack and the thrust jack.

[0050] The aforementioned adaptive lateral internal support needs to be used in conjunction with an intelligent early warning system. Figure 1As shown, the intelligent early warning system provided in this application includes a data acquisition subsystem, a data analysis subsystem, an early warning subsystem, and an intelligent correction subsystem. The data acquisition subsystem includes a strain gauge 4 and a thrust gauge 5. The strain gauge is connected to a strain gauge, and the thrust gauge is connected to a thrust jack and a structural jack. The data analysis subsystem includes a data cache module 13 and a calculation unit 14. The data acquisition subsystem transmits the acquired data to the data cache module, and the calculation unit analyzes and plots the curves. The early warning subsystem includes an early warning module 15, an instruction distribution module 16, and a PC terminal 17. The PC terminal displays the curves plotted by the data analysis subsystem and issues early warnings through the early warning module. The instruction distribution module sends the early warning information to the safety warning lights 19 at the construction site. The intelligent correction subsystem includes a correction module 18. The correction module sends adjustment commands to the drive motor and the thrust jack based on the early warning information to adjust the position of the climbing structure and the thrust of the thrust jack in the support structure.

[0051] This application utilizes an intelligent early warning system to promptly detect and issue warnings of potential safety hazards. Another innovation lies in its ability to analyze the required thrust and loading position of the lateral internal supports during the warning process, thereby effectively improving the stress condition of the sheet piles. This improvement also includes calculating whether additional edge support structures are needed. Specific early warning methods are as follows: Figure 4 As shown, it includes the following steps:

[0052] Step S1: Install the structure. Install sheet piles, strain gauges, and racks sequentially on the inner wall of the foundation pit to form a side support structure. Install structural jacks between the ends of two adjacent I-beams and thrust jacks between the ends of two adjacent external thrust steels. Install internal and external connecting devices between the external thrust steels and the I-beams. Install a drive motor on the I-beams. The motor shaft of the drive motor is inserted into the center of the drive gear, and the drive gear meshes with the rack.

[0053] Step S2: Data Acquisition and Analysis. Connect the strain acquisition instrument to the strain gauge, and the thrust acquisition instrument to the thrust jack and structural jack. Acquire the corresponding strain and thrust data, and transmit the strain and thrust data to the data analysis subsystem. The calculation unit of the data analysis subsystem calculates the stress distribution of the sheet pile based on the data and the material properties of the sheet pile, and plots the stress curve of the sheet pile along the depth direction.

[0054] Step S3: Emergency Warning. The obtained stress of the sheet pile is compared with the preset safety limit of sheet pile stress. If it exceeds the preset safety limit of sheet pile stress, the warning information is pushed to the warning subsystem. The warning module of the warning subsystem receives the warning message and displays the warning information in the construction site management system on the PC through the instruction distribution module. The location of the incident is marked, and the safety warning lights at the construction site are lit to promptly notify the construction personnel to evacuate.

[0055] Step S4: Intelligent correction. The intelligent correction subsystem receives the early warning information, analyzes the stress curve of the sheet pile, and sends adjustment commands to the drive motor and thrust jacks to adjust the position of the climbing structure and the thrust of the thrust jacks in the support structure.

[0056] Clearly, intelligent correction in step S4 consists of two steps:

[0057] Step S41: Assuming the lateral pressure of the foundation pit remains constant, calculate and analyze the thrust of the increased thrust jack, analyze the stress change of the sheet pile, obtain the thrust value that can improve the stress condition of the sheet pile, and send a command from the correction module to control the thrust of the thrust jack to reach the calculated value.

[0058] Step S42: Assuming the lateral pressure of the foundation pit remains constant, calculate and analyze the stress position of the external thrust steel. Analyze the stress position of the support structure when the integral of the absolute stress value along the depth direction is minimized. The correction module sends a command to control the drive motor, which drives the drive gear to move the support structure to the calculated position. Here, the calculation and analysis of the optimal stress position of the transverse inner support is based on the assumption that the lateral pressure of the foundation pit and the thrust of the thrust jack remain constant. The calculated stress function f(x,y) is fitted to the actual situation, where x is the position from the top of the sheet pile into the foundation pit along the depth direction, and y is the position of the support structure from the top of the sheet pile into the foundation pit.

[0059] Taking the absolute value of the stress function f(x,y) and integrating it along the depth direction from 0 to depth h, we obtain F(y):

[0060]

[0061] Find the minimum value of F(y) and take its derivative so that its derivative is 0:

[0062]

[0063] For all y whose derivative is 0 i The minimum F(y) was obtained through verification; the y value at this point is the optimal load distribution position Y of the support structure.

[0064] Y:minF(y)

[0065] Substituting the optimal support structure load location Y into f(x,y), we obtain the stress function f(x,Y) of the sheet pile along the depth direction;

[0066] The maximum stress of the sheet pile is F(x):

[0067]

[0068] Verify whether F(x) meets the safety limit. If it does, move the support structure to the calculated position. If it does not meet the limit, additional edge support structures need to be added to the inner support at that location.

[0069] In summary, the adaptive lateral internal bracing, intelligent early warning system, and early warning method for deep foundation pit sheet piles provided in this application can monitor the stress state of the sheet piles. The data acquisition subsystem collects relevant data, and the data analysis subsystem determines whether there is any danger. If there is danger, the early warning subsystem issues an alert, displays the warning location on the PC, and illuminates the corresponding safety warning light for the sheet pile, reminding construction personnel to evacuate. The intelligent correction subsystem calculates and analyzes the thrust of the support structure and changes the loading position, thereby improving the construction safety of the foundation pit support.

[0070] Those skilled in the art will understand that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the meaning consistent with their meaning in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless defined as herein.

[0071] The meaning of "and / or" as used in this application includes situations where each exists alone or both exist simultaneously.

[0072] The term "connection" as used in this application can mean a direct connection between components or an indirect connection between components through other components.

[0073] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. An adaptive lateral internal bracing for sheet piles in deep foundation pits, wherein symmetrical side support structures are provided on the inner wall of the foundation pit, characterized in that: Support structures and climbing structures are installed between the symmetrically arranged side support structures; The side support structure includes steel sheet piles, which are installed in close contact with the inner wall of the foundation pit. Strain gauges are covered on the surface of the steel sheet piles, and toothed racks are installed on the outside of the strain gauges. The climbing structure includes a transmission gear, an I-beam, and a structural jack. Each side support structure has a rack matched with a transmission gear. The center of the transmission gear is connected to the motor shaft of the transmission motor. The transmission motor is mounted on the corresponding I-beam. A structural jack is installed between the ends of two adjacent I-beams, and the lifting direction of the structural jack is perpendicular to the inner wall of the pit. The supporting structure includes external thrust steel and thrust jacks. Each I-beam is fitted with an external thrust steel, and a thrust jack is installed between the ends of two adjacent external thrust steels. The lifting direction of the thrust jacks is perpendicular to the inner wall of the pit. The external thrust steel and the I-beam are connected by internal and external connecting devices.

2. The intelligent early warning system for adaptive lateral internal bracing of sheet piles in deep foundation pits according to claim 1, characterized in that: It includes a data acquisition subsystem, a data analysis subsystem, an early warning subsystem, and an intelligent correction subsystem. The data acquisition subsystem includes a strain gauge and a thrust gauge. The strain gauge is connected to the strain gauge, and the thrust gauge is connected to the thrust jack and the structural jack. The data analysis subsystem includes a data caching module and a computing unit. The data acquisition subsystem transmits the acquired data to the data caching module, and the computing unit analyzes the data and plots graphs. The early warning subsystem includes an early warning module, an instruction distribution module, and a PC terminal. The PC terminal displays the curves drawn by the data analysis subsystem and issues early warnings through the early warning module. The instruction distribution module sends the early warning information to the safety warning lights at the construction site. The intelligent correction subsystem includes a correction module, which sends adjustment commands to the drive motor and thrust jacks based on the early warning information, adjusting the position of the climbing structure and the thrust of the thrust jacks in the support structure.

3. The early warning method of the intelligent early warning system for adaptive lateral internal bracing of steel sheet piles in deep foundation pits according to claim 2, characterized in that: Specifically, the following steps are included: Step S1: Install the structure. Sequentially install sheet piles, strain gauges, and racks on the inner wall of the foundation pit to form a side support structure. Install structural jacks between the ends of two adjacent I-beams and thrust jacks between the ends of two adjacent external thrust steels. Install internal and external connecting devices between the external thrust steels and the I-beams. Install a drive motor on the I-beams. The motor shaft of the drive motor is inserted into the center of the drive gear, and the drive gear meshes with the rack. Step S2: Data acquisition and analysis. Connect the strain acquisition instrument to the strain gauge, and the thrust acquisition instrument to the thrust jack and structural jack. Acquire the corresponding strain and thrust data, and transmit the strain and thrust data to the data analysis subsystem. The calculation unit of the data analysis subsystem calculates the stress distribution of the steel sheet pile based on the data and the material properties of the steel sheet pile, and plots the stress curve of the steel sheet pile along the depth direction. Step S3: Emergency Warning. The obtained stress of the sheet pile is compared with the preset safety limit of sheet pile stress. If it exceeds the preset safety limit of sheet pile stress, the warning information is pushed to the warning subsystem. The warning module of the warning subsystem receives the warning message and displays the warning information in the construction site management system on the PC through the instruction distribution module. The location of the incident is marked, and the safety warning lights at the construction site are lit to promptly notify the construction personnel to evacuate. Step S4: Intelligent correction. The intelligent correction subsystem receives the early warning information, analyzes the stress curve of the sheet pile, and sends adjustment commands to the drive motor and thrust jacks to adjust the position of the climbing structure and the thrust of the thrust jacks in the support structure.

4. The early warning method of the intelligent early warning system for adaptive lateral internal bracing of steel sheet piles in deep foundation pits according to claim 3, characterized in that: The intelligent correction in step S4 specifically includes the following steps: Step S41: Assuming the lateral pressure of the foundation pit remains constant, calculate and analyze the thrust of the increased thrust jack, analyze the stress change of the sheet pile, obtain the thrust value that can improve the stress condition of the sheet pile, and send a command from the correction module to control the thrust of the thrust jack to reach the calculated value. Step S42: Assuming the lateral pressure of the foundation pit remains constant, calculate and analyze the stress position of the external thrust steel, analyze the stress position of the support structure when the integral of the absolute stress value along the depth direction is the minimum, and the correction module sends a command to control the drive motor. The drive motor drives the drive gear to move the support structure to the calculated position.

5. The early warning method of the intelligent early warning system for adaptive lateral internal bracing of steel sheet piles in deep foundation pits according to claim 4, characterized in that: In step S42, the specific steps of the transmission motor driving the transmission gear to move the external thrust steel to the calculated position are as follows: under the assumption that the soil side pressure of the foundation pit and the thrust of the thrust jack remain unchanged, calculate the actual stress function f(x,y), where x is the position from the top of the steel sheet pile into the foundation pit along the depth direction, and y is the position of the supporting structure from the top of the steel sheet pile into the foundation pit. Taking the absolute value of the stress function f(x,y) and integrating it along the depth direction from 0 to depth h, we obtain F(y): Find the minimum value of F(y) and take its derivative so that its derivative is 0: do: For all y whose derivative is 0 i The minimum F(y) was obtained through verification; the y value at this point is the optimal load distribution position Y of the support structure. Y:minF(y) Substituting the optimal support structure load location Y into f(x,y), we obtain the stress function f(x,Y) of the sheet pile along the depth direction; The maximum stress of the sheet pile is F(x): Verify whether F(x) meets the safety limit. If it does, move the support structure to the calculated position; if it does not, additional edge support structures need to be added to the inner support at that location.

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