A servo-driven steel-supported foundation pit excavation process deformation measurement and control system and method

Abstract

This application provides a servo-driven steel-supported foundation pit excavation process deformation measurement and control system, including a front-end measurement and control device and a data processing device. The front-end measurement and control device includes: a non-contact rangefinder, which is mounted on a first capping beam; an inclinometer, which is mounted inside the foundation pit retaining structure; a steel support, which provides dynamic axial force to the foundation pit retaining structure; and an auxiliary measurement target, which is mounted on the steel support and closely attached to a second foundation pit retaining structure, providing a measurement reference for the non-contact rangefinder. The data processing device is connected to the non-contact rangefinder, the inclinometer, and the steel support, and dynamically adjusts the axial force of the steel support based on received data from the non-contact rangefinder, the inclinometer, and the steel support. This application also provides a servo-driven steel-supported foundation pit excavation process deformation measurement and control method.

Description

Technical Field

[0001] This invention belongs to the field of foundation pit construction technology, specifically relating to a servo-supported steel-supported foundation pit excavation process deformation measurement and control system and method. Background Technology

[0002] Excavation pit construction can easily cause ground deformation, threatening the safety of adjacent buildings, roads, underground pipelines, and other structures. Therefore, deformation control during excavation pit construction is crucial for ensuring construction safety and the safety of adjacent buildings. With the acceleration of urbanization and the increasing scarcity of land resources, excavation pit construction faces more and more spatial constraints. Against this backdrop, excavation pit construction faces higher requirements for deformation control, and traditional excavation pit support technologies are gradually becoming inadequate to meet construction needs.

[0003] In recent years, servo active control technology has been widely applied in foundation pit construction. Servo active control typically uses the deformation of the retaining structure as a control indicator, adjusting the axial force of the servo support based on the deformation of the retaining structure to control the deformation during foundation pit construction. Traditional methods for monitoring foundation pit deformation usually involve manual readings using inclinometers, total stations, and levels, followed by reporting and analysis. This results in servo control lagging behind deformation, failing to meet the requirements for accurate, efficient, and real-time control of retaining structure deformation.

[0004] Chinese patent CN218469781U proposes a self-correcting foundation pit displacement monitoring device. This device utilizes the space within the upright pole, creating a channel and housing an inclinometer within that channel, as well as a settlement monitoring instrument within the pole's mounting cavity. This allows for the determination of camera position changes, thereby automatically correcting for foundation pit displacement variations. This effectively ensures the accuracy of foundation pit displacement monitoring data and improves monitoring performance.

[0005] Chinese patent CN105735380B proposes a monitoring device and method for deep horizontal displacement and vertical settlement of foundation pits. This method solves technical problems such as low automation, high labor intensity, and delayed measurement data by using pre-set strain gauges.

[0006] Chinese patent CN106524989A proposes an automatic deformation analysis system and data analysis method for large-scale foundation pit support structures. This system and method monitor the stress and strain of the foundation pit support structure by pre-installing steel gauges and strain meters, thereby decomposing the stress and strain into load stress, temperature stress, shrinkage stress, and load strain, temperature strain, and other data. This system and method can accurately grasp the stress condition of the foundation pit support structure, thus providing safety assurance for foundation pit construction.

[0007] However, the methods and devices disclosed in the aforementioned patents also have many problems in actual use. For example, in actual use, they can only monitor the vertical and horizontal displacement of the top of the foundation pit cap beam, and cannot obtain the deformation of the internal support structure of the foundation pit. Furthermore, since all the detectors are preset, once a detector malfunctions or the wiring is unreasonable, it is necessary to disassemble and repair the structure or abandon monitoring, which will have a significant impact on construction. Summary of the Invention

[0008] To address the aforementioned issues, the purpose of this application is to provide a method and system for measuring and controlling the deformation during the entire process of servo-supported foundation pit excavation. This method enables the determination of the true maximum deformation of the retaining structure, providing a basis for optimizing the axial force of the steel support.

[0009] This application provides a servo-controlled steel-supported foundation pit excavation process deformation measurement and control system, including a front-end measurement and control device and a data processing device. The front-end measurement and control device is installed on the foundation pit retaining structure and the capping beam. The foundation pit retaining structure includes a first foundation pit retaining structure and a second foundation pit retaining structure. The capping beam includes a first capping beam and a second capping beam. The first capping beam is installed on the first foundation pit retaining structure, and the second capping beam is installed on the second foundation pit retaining structure.

[0010] The front-end measurement and control device includes:

[0011] A non-contact rangefinder, wherein the non-contact rangefinder is mounted on the first crown beam;

[0012] Inclinometer, which is installed inside the retaining structure of the foundation pit;

[0013] A steel support, comprising a support rod and a servo support end, is disposed between the first foundation pit retaining structure and the second foundation pit retaining structure, and provides dynamic axial force to the foundation pit retaining structure.

[0014] An auxiliary measuring target is provided on the steel support and in close contact with the second foundation pit retaining structure. The auxiliary measuring target provides a measuring reference for the non-contact rangefinder.

[0015] The data processing device is connected to the non-contact rangefinder, the inclinometer, and the steel support. The data processing device dynamically adjusts the axial force of the steel support based on the received data from the non-contact rangefinder, the inclinometer, and the steel support.

[0016] Furthermore, in the aforementioned servo steel support foundation pit excavation process deformation measurement and control system, the number of auxiliary measurement targets is multiple, and the multiple auxiliary measurement targets are set in the same vertical axis.

[0017] Furthermore, the servo steel support foundation pit excavation process deformation measurement and control system also includes a benchmark measurement target, which is set on the second cap beam. The benchmark measurement target provides a reference for the auxiliary measurement target to be in the same vertical axis.

[0018] Furthermore, in the aforementioned servo steel support foundation pit excavation process deformation measurement and control system, the number of non-contact rangefinders is multiple, which are arranged in alternating rows along the centerline of two rows of steel supports.

[0019] This application embodiment also provides a method for measuring and controlling the deformation during the entire process of servo-supported foundation pit excavation. The method uses the aforementioned front-end measurement and control device to acquire data and a data processing device to process the data, including the following steps:

[0020] S1) Establish a coordinate system and acquire data from the non-contact rangefinder and steel support. The non-contact rangefinder data includes the position coordinates of the non-contact rangefinder, the distance between the non-contact rangefinder and the auxiliary measurement target, the distance between the non-contact rangefinder and the auxiliary measurement target in the Y direction, and the distance between the non-contact rangefinder and the auxiliary measurement target in the Z direction. The steel support data includes the axial force of the steel support, the initial length of the servo support end, the shrinkage of the servo support end, the initial length of the support rod of the steel support, and the shrinkage of the support rod of the steel support.

[0021] S2) Calculate the second deformation of the enclosure structure in real time using the non-contact rangefinder data and steel support data through the basic calculation logic;

[0022] S3) Obtain the overall deformation form of the retaining structure and, based on the real-time calculated second deformation amount of the retaining structure and the overall deformation form of the retaining structure, use the retaining structure deformation inversion algorithm to invert the real-time overall deformation amount of the retaining structure. The overall deformation form of the retaining structure is periodically obtained by the inclinometer set in the foundation pit retaining structure.

[0023] S4) The real-time overall deformation of the enclosure structure is used to adjust the axial force of the steel support.

[0024] Furthermore, in the aforementioned method for measuring and controlling the deformation during the entire excavation process of a servo-supported foundation pit, the foundation calculation logic includes a first foundation calculation logic, a second foundation calculation logic, and a third foundation calculation logic. Step S2 further includes:

[0025] S21) Calculate the distance in the X direction between the non-contact rangefinder and the auxiliary measurement target using the first basic calculation logic based on the data from the non-contact rangefinder.

[0026] S22) Real-time acquisition of the displacement of the non-contact rangefinder in the X direction and the displacement of the non-contact rangefinder relative to the auxiliary measuring target in the X direction. The displacement of the non-contact rangefinder in the X direction is acquired by periodically monitoring the position coordinate information of the non-contact rangefinder, and the displacement of the non-contact rangefinder relative to the auxiliary measuring target in the X direction is acquired by real-time calculation of the distance between the non-contact rangefinder and the auxiliary measuring target in the X direction.

[0027] S23) The first deformation of the enclosure structure is calculated in real time by the second basic calculation logic based on the displacement of the non-contact rangefinder in the X direction and the displacement of the non-contact rangefinder relative to the auxiliary measuring target in the X direction.

[0028] S23) Based on the distance between the non-contact rangefinder and the auxiliary measuring target in the X direction calculated in the first calculation, the steel support data, and the first deformation of the enclosure structure, the second deformation of the enclosure structure is calculated in real time through the third basic calculation logic.

[0029] Furthermore, in the aforementioned method for measuring and controlling the deformation during the entire excavation process of a servo-supported foundation pit, the first foundation calculation logic expression is as follows:

[0030] ;

[0031] in, The distance between the non-contact rangefinder and the auxiliary measurement target;

[0032] The distance between the non-contact rangefinder and the auxiliary measurement target in the Y direction;

[0033] The distance between the non-contact rangefinder and the auxiliary measurement target in the Z direction;

[0034] The distance between the non-contact rangefinder and the auxiliary measurement target in the X direction.

[0035] Furthermore, in the aforementioned method for measuring and controlling the deformation during the entire excavation process of a servo-supported foundation pit, the second foundation calculation logic expression is as follows:

[0036] ;

[0037] in, The displacement of the non-contact rangefinder relative to the auxiliary measuring target in the X direction is the amount of displacement.

[0038] The displacement of the non-contact rangefinder in the X direction;

[0039] The first deformation of the enclosure structure.

[0040] Furthermore, in the aforementioned method for measuring and controlling the deformation during the entire excavation process of a servo-supported foundation pit, the logical expression for calculating the third foundation is as follows:

[0041] ;

[0042] in, The first deformation of the enclosure structure;

[0043] The initial length of the support rod of the steel support;

[0044] The amount of contraction of the support rod of the steel support;

[0045] The initial length of the servo support end;

[0046] This refers to the amount of contraction at the servo support end.

[0047] The distance in the X direction between the non-contact rangefinder and the auxiliary measurement target is the distance calculated in the first step.

[0048] This is the second deformation of the enclosure structure.

[0049] Furthermore, in the aforementioned method for measuring and controlling the deformation of the entire excavation process of the servo steel support foundation pit, the overall deformation pattern of the retaining structure is acquired once per day.

[0050] The technical solution provided in this application achieves real-time monitoring of the deformation of one side of the foundation pit retaining structure through a non-contact measurement method and the spatial Pythagorean theorem, while combining a contact measurement method to achieve real-time monitoring of the deformation of the retaining structure on the other side. Since the deformation of both retaining structures can be obtained independently, the true maximum deformation of the retaining structure can be determined, thereby reducing labor intensity, enhancing the timeliness of measurement data, and better obtaining the deformation of the internal support structure of the foundation pit. Attached Figure Description

[0051] Figure 1 This is a schematic diagram of a preferred embodiment of the servo-supported foundation pit excavation process deformation measurement and control system.

[0052] Figure 2 This is a flowchart of a preferred embodiment of the servo steel support foundation pit excavation process for construction deformation measurement and control.

[0053] Figure 3This is a schematic diagram of the first basic calculation logic parameters of the preferred method for measuring and controlling the deformation of the entire excavation process of a servo-supported foundation pit in an embodiment of the present invention.

[0054] Figure 4A and Figure 4B This is a schematic diagram of the parameters for calculating the foundation pit deformation in the preferred embodiment of the servo steel support foundation pit excavation process deformation measurement and control method of the present invention.

[0055] Figure 5 This is a flowchart illustrating an application example of the servo-supported foundation pit excavation deformation measurement and control method selected from the embodiments of the present invention. Detailed Implementation

[0056] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions. The described embodiments are some embodiments of this application, but not all embodiments. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0057] Furthermore, it should be noted that, unless otherwise explicitly specified and limited, terms such as “installation,” “connection,” and “linkage” used in the description of this application should be interpreted broadly. For example, a connection 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 an indirect connection through an intermediate medium; or it can be a connection within two components. Those skilled in the art can understand its specific meaning in this application according to the specific circumstances.

[0058] Figure 1 This is a schematic diagram of a preferred embodiment of the servo-supported foundation pit excavation deformation monitoring and control system. Figure 1 As shown, a servo-controlled steel-supported foundation pit excavation process deformation monitoring and control system includes a front-end monitoring and control device and a data processing device. The front-end monitoring and control device is installed on the foundation pit retaining structure 1. The foundation pit retaining structure 1 includes a first foundation pit retaining structure 11 and a second foundation pit retaining structure 12. The capping beam 2 includes a first capping beam 21 and a second capping beam 22. The first capping beam 21 is installed on the first foundation pit retaining structure 11, and the second capping beam 22 is installed on the second foundation pit retaining structure 12. The first capping beam 21 and the second capping beam 22 are connected by a concrete support 3.

[0059] The front-end measurement and control device includes: a non-contact rangefinder 4 mounted on the first cap beam 21; an inclinometer (not shown in the figure) mounted in the foundation pit retaining structure 1; a steel support 5 mounted between the first foundation pit retaining structure 11 and the second foundation pit retaining structure 12; and an auxiliary measurement target 6 mounted on the steel support 5 and closely attached to the second foundation pit retaining structure 12. The steel support 5 includes a support rod 51 and a servo support end 52, and provides dynamic axial force to the foundation pit retaining structure.

[0060] The data processing device is connected to the non-contact rangefinder 4, the inclinometer, and the steel support 5. The data processing device receives data from the non-contact rangefinder 4, the inclinometer, and the steel support 5, and dynamically adjusts the axial force of the steel support 5 based on the received data. It is worth noting that the data processing device can use the preferred servo-driven steel support excavation process deformation measurement and control method of this embodiment to dynamically adjust the axial force of the steel support 5.

[0061] In this preferred embodiment, there are multiple auxiliary measurement targets, all positioned within the same vertical axis. The reference measurement target 61 is positioned on the second crown beam 22. Positioning the reference measurement target 61 allows the auxiliary measurement targets 6 to be better positioned within the same vertical axis.

[0062] In this preferred embodiment, there are multiple non-contact rangefinders 4, which are installed on the first crown beam 51 by fixed brackets and are arranged alternately on the center line of the two columns of steel supports.

[0063] In this preferred embodiment, the servo support end 52 is disposed on the side of the first enclosure structure 11, and its two ends are respectively fixed to the support rod 51 and the first enclosure structure 11 by bolts.

[0064] In this preferred embodiment, the servo support end 52 is internally equipped with a displacement sensor, a load sensor, and a CNC pump station. The displacement sensor monitors the contraction of the servo support end 52, the load sensor monitors the axial force of the support, and the CNC pump station adjusts the axial force of the support. The displacement sensor, load sensor, and CNC pump station are connected to a data processing device, which can receive data from the displacement sensor, load sensor, and CNC pump station and transmit commands to them.

[0065] Figure 2 This is a flowchart illustrating a preferred embodiment of the servo-supported foundation pit excavation deformation measurement and control method. Figure 2 As shown, the method for measuring and controlling the deformation during the entire excavation process of a servo-supported foundation pit, applied to the preferred embodiment of the servo-supported foundation pit excavation process deformation measurement and control system of this invention, includes the following steps: Data is acquired using a front-end measurement and control device, and the data is processed using a data processing device.

[0066] S1) Establish a coordinate system and acquire data from the non-contact rangefinder and steel support. The non-contact rangefinder data includes the position coordinates of the non-contact rangefinder, the distance between the non-contact rangefinder and the auxiliary measuring target, the distance between the non-contact rangefinder and the auxiliary measuring target in the Y direction, and the distance between the non-contact rangefinder and the auxiliary measuring target in the Z direction. The steel support data includes the axial force of the steel support, the initial length of the servo support end, the shrinkage of the servo support end, the initial length of the support rod of the steel support, and the shrinkage of the support rod of the steel support.

[0067] S2) The second deformation of the enclosure structure is calculated in real time based on the data from the non-contact rangefinder and the steel support data through the basic calculation logic;

[0068] S3) Obtain the overall deformation form of the retaining structure and, based on the real-time calculated second deformation amount of the retaining structure and the overall deformation form of the retaining structure, use the retaining structure deformation inversion algorithm to invert the real-time overall deformation amount of the retaining structure. The overall deformation form of the retaining structure is periodically obtained by the inclinometer set in the retaining structure of the foundation pit.

[0069] S4) The real-time overall deformation of the enclosure structure is used to adjust the axial force of the steel supports.

[0070] Figure 3 This is a schematic diagram of the first basic calculation logic parameters for the preferred method of measuring and controlling the deformation during the entire construction process of servo steel support foundation pit excavation in an embodiment of the present invention. Figure 4A and Figure 4B This is a schematic diagram of the parameters for calculating the foundation pit deformation in the preferred embodiment of the servo-supported foundation pit excavation process deformation measurement and control method of the present invention. The following is in conjunction with... Figure 1 Figure 4 further illustrates the method for measuring and controlling the deformation during the entire excavation process of the servo steel support foundation pit.

[0071] S1) Establish a coordinate system and acquire data from the non-contact rangefinder and steel support. The non-contact rangefinder data includes the position coordinates of the non-contact rangefinder, the distance between the non-contact rangefinder and the auxiliary measuring target, the distance between the non-contact rangefinder and the auxiliary measuring target in the Y direction, and the distance between the non-contact rangefinder and the auxiliary measuring target in the Z direction. The steel support data includes the axial force of the steel support, the initial length of the servo support end, the shrinkage of the servo support end, the initial length of the support rod of the steel support, and the shrinkage of the support rod of the steel support.

[0072] Specifically, the coordinate system orientation is established as follows: Figure 1 or Figure 3 As shown.

[0073] S2) The second deformation of the enclosure structure is calculated in real time based on the data from the non-contact rangefinder and the steel support data through the basic calculation logic.

[0074] Specifically, the basic computation logic includes a first basic computation logic, a second basic computation logic, and a third basic computation logic, and step S2) further includes:

[0075] S21) Calculate the distance in the X direction between the non-contact rangefinder and the auxiliary measurement target using the first basic calculation logic based on the data from the non-contact rangefinder.

[0076] Furthermore, the first basic computational logic expression is:

[0077] ;

[0078] in, This refers to the distance between the non-contact rangefinder and the auxiliary measurement target.

[0079] The distance between the non-contact rangefinder and the auxiliary measurement target in the Y direction;

[0080] The distance between the non-contact rangefinder and the auxiliary measurement target in the Z direction;

[0081] This refers to the distance in the X direction between the non-contact rangefinder and the auxiliary measurement target.

[0082] S22) Real-time acquisition of the displacement of the non-contact rangefinder in the X direction and the displacement of the non-contact rangefinder relative to the auxiliary measuring target in the X direction. The displacement of the non-contact rangefinder in the X direction is acquired by periodically monitoring the position coordinate information of the non-contact rangefinder, and the displacement of the non-contact rangefinder relative to the auxiliary measuring target in the X direction is acquired by real-time calculation of the distance between the non-contact rangefinder and the auxiliary measuring target in the X direction.

[0083] S23) The first deformation of the enclosure structure is calculated in real time by the second basic calculation logic based on the displacement of the non-contact rangefinder in the X direction and the displacement of the non-contact rangefinder relative to the auxiliary measuring target in the X direction.

[0084] Furthermore, the second basic computational logic expression is as follows:

[0085] ;

[0086] in, The displacement of the non-contact rangefinder relative to the auxiliary measuring target in the X direction is the amount of displacement.

[0087] This represents the displacement of the non-contact rangefinder in the X direction.

[0088] This is the first deformation of the enclosure structure.

[0089] S23) Based on the distance between the non-contact rangefinder and the auxiliary measuring target in the X direction calculated in the first calculation, the steel support data, and the first deformation of the enclosure structure, the second deformation of the enclosure structure is calculated in real time through the third basic calculation logic.

[0090] Furthermore, the third basic computational logic expression is as follows:

[0091] ;

[0092] in, The first deformation of the enclosure structure;

[0093] The initial length of the support rod for the steel support;

[0094] This refers to the shrinkage of the support rod in the steel support system.

[0095] This is the initial length of the servo support end;

[0096] This refers to the amount of contraction at the servo support end.

[0097] The distance in the X direction between the non-contact rangefinder and the auxiliary measurement target is the distance calculated in the first step.

[0098] This is the second deformation of the enclosure structure.

[0099] Preferably, the overall deformation pattern of the enclosure structure is obtained once per day.

[0100] Preferably, the acquisition cycle of the non-contact rangefinder's position coordinate information is once per day.

[0101] Figure 5 This is a flowchart illustrating an application example of the deformation measurement and control method for the entire excavation process of a servo-supported foundation pit, as preferred in this embodiment of the invention. Figures 1 to 5 As shown, an application example of the preferred servo-supported foundation pit excavation deformation measurement and control method of the present invention includes the following steps:

[0102] Step 1: Pre-set the inclinometer inside the retaining structure to obtain the overall deformation pattern of the retaining structure. This deformation pattern is updated once a day and input into the data processing device.

[0103] Step 2: After excavating the first layer of soil and constructing the capping beam 1, fix the non-contact rangefinder 4 on the capping beam; determine and record the position coordinate information of the non-contact rangefinder 4 at this moment using the baseline method and transmit it to the terminal calculation module. This coordinate information is updated once a day.

[0104] Step 3: Set up a reference measuring target 61 on the first crown beam 21 opposite to the non-contact rangefinder 4, and set up an auxiliary measuring target 6 on one side of the steel support 5, ensuring that each auxiliary measuring target 6 is in the same vertical axis. After the auxiliary measuring targets 6 are set up, start recording the distance between the non-contact rangefinder 4 and the auxiliary measuring targets 6, and input the data into the data processing device in real time.

[0105] Step 4: The sum of the distances between the non-contact rangefinder 4 and the auxiliary measuring target 6 in the Y and Z directions is known and constant. Since the distance between the non-contact rangefinder and the measuring target can be obtained in real time, the distance between the non-contact rangefinder and the measuring target in the X direction is calculated based on the first basic calculation logic within the data processing device. For example, the distances between the non-contact rangefinder 4 and the auxiliary measuring target 6 in the Y and Z directions are respectively... , The distance between the non-contact rangefinder 4 and the auxiliary measurement target 6 in the X direction is calculated using the first basic calculation logic. .

[0106] Step 5: Erect the first-layer steel support 5 and the servo support end 52, and fix both ends of the servo support end 52 to the support rod 51 and the foundation pit retaining structure 1 respectively with bolts. After erection, start monitoring the shrinkage of the servo support end 52. (With compression as positive) and axial force of steel support F A And input the data into the data processing device in real time.

[0107] Step 6: The second basic calculation logic within the data processing device obtains the displacement in the X direction of the non-contact rangefinder 4 based on its input coordinates. The distance increment in the X direction is obtained by combining the non-contact rangefinder 4 and the auxiliary measurement target 6. Calculate the point deformation of a single-sided enclosure structure (on the side where the measurement target is installed) in the X direction. (A positive value is defined as an increase in the positive direction of the X-axis).

[0108] Step 7: The third basic calculation logic within the data processing device is transmitted via the axial force of the steel support. F A Equivalent stiffness of rigid support K A Calculate the shrinkage of support rod 51 (With compression as positive), based on the initial distance in the X direction between the non-contact rangefinder 4 and the auxiliary measuring target 6. Initial length of servo support end 52 The shrinkage amount of the servo support end 52 (With contraction as positive), the initial length of support rod 51 Shrinkage of steel supports (Taking contraction as positive), the horizontal deformation value of the second foundation pit retaining structure 12 (on the side where the measuring target is installed) in the X direction. (First deformation of the enclosure structure) Calculate the deformation value of one side of the enclosure structure (opposite to the side where the measuring target is installed) in the X direction. (Second deformation of the enclosure structure).

[0109] Step 8: The enclosure structure deformation inversion algorithm in the data processing device is based on the Bayesian inversion method. It inverts the real-time overall deformation of the enclosure structure by using the real-time deformation of the enclosure structure at the support and the overall deformation pattern of the enclosure structure. D Z .

[0110] Step 9: The axial force optimization algorithm in the data processing device uses the retaining structure parameters (thickness, length, elastic modulus, strength grade), steel support parameters (support depth, number of supports, equivalent support stiffness), soil parameters (excavation depth, unit weight, cohesion, internal friction angle, lateral pressure coefficient), and the real-time overall deformation of the retaining structure. D Z and the current supporting axial force F The input parameters are used to determine the optimization direction and increment of the axial force, and the control command is sent to the CNC pump station to adjust the axial force of the steel support 5.

[0111] Step 10: Continue excavating the soil downwards and erecting steel supports, repeating steps 3 to 9. For example, continue excavating the second layer of soil and erecting the second layer of steel supports 5, while simultaneously erecting auxiliary measuring targets 6 at the same positions as the first layer of steel supports 5. Continue excavating downwards in this manner.

[0112] This invention achieves real-time monitoring of the deformation of the second foundation pit retaining structure 12 through a non-contact measurement method and the spatial Pythagorean theorem, and achieves real-time monitoring of the deformation of the first foundation pit retaining structure 11 by combining a contact measurement method; the deformation of the retaining structures on both sides can be obtained separately, so as to determine the true maximum deformation of the retaining structure, rather than the average maximum value of the deformation of the retaining structures on both sides; thus optimizing the judgment criteria for the axial force optimization of the steel support.

[0113] Those skilled in the art will understand that information, signals, and data can be represented using any of a variety of different techniques and skills. For example, the data, instructions, commands, information, signals, bits, symbols, and chips described throughout the above description can be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or optical particles, or any combination thereof.

[0114] Those skilled in the art will further appreciate that the various illustrative logic blocks, modules, circuits, and algorithm steps described in conjunction with the embodiments disclosed herein can be implemented as electronic hardware, computer software, or a combination of both. To clearly illustrate this hardware-software interchangeability, the various illustrative components, blocks, modules, circuits, and steps are described above in a generalized manner in terms of their functionality. Whether such functionality is implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system. Those skilled in the art may implement the described functionality in different ways for each specific application, but such implementation decisions should not be construed as departing from the scope of this application.

[0115] The various illustrative logic modules and circuits described in conjunction with the embodiments disclosed herein may be implemented or performed using a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. The general-purpose processor may be a microprocessor, but in alternatives, it may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors cooperating with a DSP core, or any other such configuration.

[0116] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of both. The software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to a processor such that the processor can read and write information to / from the storage medium. In an alternative, the storage medium may be integrated into the processor. The processor and storage medium may reside in an ASIC. The ASIC may reside in a user terminal. In an alternative, the processor and storage medium may reside as discrete components in the user terminal.

[0117] In one or more exemplary embodiments, the described functionality may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software as a computer program product, the functionality may be stored or transmitted as one or more instructions or code on or through a computer-readable medium. A computer-readable medium includes both computer storage media and communication media, encompassing any medium that facilitates the transfer of a computer program from one location to another. A storage medium may be any available medium accessible to a computer. By way of example and not limitation, such a computer-readable medium may include RAM, ROM, EEPROM, CD-ROM or other optical disc storage, disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and is accessible to a computer. Any connection is also legitimately referred to as a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of a medium. As used in this article, disk and disc include compact discs (CDs), laser discs, optical discs, digital multi-purpose discs (DVDs), floppy disks, and Blu-ray discs. Disks typically reproduce data magnetically, while discs reproduce data optically using lasers. Combinations of these should also be included within the scope of computer-readable media.

[0118] The above embodiments are provided for those skilled in the art to implement or use this application. Those skilled in the art can make various modifications or changes to the above embodiments without departing from the spirit of this application. Therefore, the scope of protection of this application is not limited to the above embodiments, but should be the maximum scope that conforms to the innovative features mentioned in the claims.

Claims

1. A method for measuring and controlling deformation during the entire excavation process of a servo-supported foundation pit, characterized in that, Including the following steps: S1) Establish a coordinate system and acquire data from the non-contact rangefinder and steel support. The non-contact rangefinder data includes the position coordinates of the non-contact rangefinder, the distance between the non-contact rangefinder and the auxiliary measurement target, the distance between the non-contact rangefinder and the auxiliary measurement target in the Y direction, and the distance between the non-contact rangefinder and the auxiliary measurement target in the Z direction. The steel support data includes the axial force of the steel support, the initial length of the servo support end, the shrinkage of the servo support end, the initial length of the support rod of the steel support, and the shrinkage of the support rod of the steel support. S2) Calculate the second deformation of the enclosure structure in real time using the non-contact rangefinder data and steel support data through the basic calculation logic; S3) Obtain the overall deformation form of the retaining structure and, based on the real-time calculated second deformation amount of the retaining structure and the overall deformation form of the retaining structure, use the retaining structure deformation inversion algorithm to invert the real-time overall deformation amount of the retaining structure. The overall deformation form of the retaining structure is periodically obtained by the inclinometer set in the foundation pit retaining structure. S4) The real-time overall deformation of the enclosure structure is used to adjust the axial force of the steel support; The basic computational logic includes a first basic computational logic, a second basic computational logic, and a third basic computational logic. Step S2 further includes: S21) Calculate the distance in the X direction between the non-contact rangefinder and the auxiliary measurement target using the first basic calculation logic based on the data from the non-contact rangefinder. S22) Real-time acquisition of the displacement of the non-contact rangefinder in the X direction and the displacement of the non-contact rangefinder relative to the auxiliary measuring target in the X direction. The displacement of the non-contact rangefinder in the X direction is acquired by periodically monitoring the position coordinate information of the non-contact rangefinder, and the displacement of the non-contact rangefinder relative to the auxiliary measuring target in the X direction is acquired by real-time calculation of the distance between the non-contact rangefinder and the auxiliary measuring target in the X direction. S23) The first deformation of the enclosure structure is calculated in real time by the second basic calculation logic based on the displacement of the non-contact rangefinder in the X direction and the displacement of the non-contact rangefinder relative to the auxiliary measuring target in the X direction. S23) Based on the distance between the non-contact rangefinder and the auxiliary measuring target in the X direction calculated in the first calculation, the steel support data, and the first deformation of the enclosure structure, the second deformation of the enclosure structure is calculated in real time through the third basic calculation logic. The first basic calculation logic expression is: ； in, The distance between the non-contact rangefinder and the auxiliary measurement target; The distance between the non-contact rangefinder and the auxiliary measurement target in the Y direction; The distance between the non-contact rangefinder and the auxiliary measurement target in the Z direction; The distance between the non-contact rangefinder and the auxiliary measurement target in the X direction; The second basic calculation logic expression is: ； in, The displacement of the non-contact rangefinder relative to the auxiliary measuring target in the X direction is the amount of displacement. The displacement of the non-contact rangefinder in the X direction; The first deformation of the enclosure structure; The third basic calculation logic expression is: ； in, The first deformation of the enclosure structure; The initial length of the support rod of the steel support; The amount of contraction of the support rod of the steel support; The initial length of the servo support end; The amount of contraction at the servo support end; The distance in the X direction between the non-contact rangefinder and the auxiliary measurement target, as calculated in the first step; This is the second deformation of the enclosure structure.

2. The method for measuring and controlling the deformation during the entire excavation process of a servo-supported foundation pit as described in claim 1, characterized in that, The overall deformation pattern of the enclosure structure is obtained once per day.

3. A servo-controlled steel-supported foundation pit excavation process deformation measurement and control system, using the servo-controlled steel-supported foundation pit excavation process deformation measurement and control method as described in any one of claims 1 to 2, comprising a front-end measurement and control device and a data processing device, wherein the front-end measurement and control device is installed on the foundation pit retaining structure and the capping beam, the foundation pit retaining structure includes a first foundation pit retaining structure and a second foundation pit retaining structure, the capping beam includes a first capping beam and a second capping beam, the first capping beam is installed on the first foundation pit retaining structure, and the second capping beam is installed on the second foundation pit retaining structure. The front-end measurement and control device includes: A non-contact rangefinder, wherein the non-contact rangefinder is mounted on the first crown beam; Inclinometer, which is installed inside the retaining structure of the foundation pit; A steel support, comprising a support rod and a servo support end, is disposed between the first foundation pit retaining structure and the second foundation pit retaining structure, and provides dynamic axial force to the foundation pit retaining structure. An auxiliary measuring target is provided on the steel support and in close contact with the second foundation pit retaining structure. The auxiliary measuring target provides a measuring reference for the non-contact rangefinder. The data processing device is connected to the non-contact rangefinder, the inclinometer, and the steel support. The data processing device dynamically adjusts the axial force of the steel support based on the received data from the non-contact rangefinder, the inclinometer, and the steel support.

4. The servo-driven steel support foundation pit excavation process deformation measurement and control system according to claim 3, characterized in that, The number of auxiliary measurement targets is multiple, and the multiple auxiliary measurement targets are set in the same vertical axis.

5. The servo-driven steel support foundation pit excavation process deformation measurement and control system according to claim 3, characterized in that, It also includes a reference measurement target, which is set on the second crown beam, and the reference measurement target provides a reference for the auxiliary measurement target to be in the same vertical axis.

6. The servo-driven steel support foundation pit excavation process deformation measurement and control system according to claim 3, characterized in that, The number of non-contact rangefinders is multiple, and they are arranged in alternating columns along the center line of the two columns of steel supports.

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