A multi-point synchronous automatic measurement system for lateral deformation of foundation pit retaining wall

Abstract

The present invention provides a multi-point synchronous automatic measurement system for the lateral deformation of a foundation pit retaining structure, comprising a pipeline, two or more measuring devices and an acquisition and transmission device, wherein each measuring device comprises a support frame, an inclined rod and a sensor, the pipeline is buried in the foundation pit retaining structure, the cross section of the pipeline is rectangular, and the interior of the pipeline is provided with relatively arranged card slots for fixing the support frame, the card slots are arranged along the axial length of the pipeline, a bottom plate is provided at the bottom of the card slots, the support frame comprises four rods, and adjacent rods are connected by a rotating shaft to form a rectangular structure, the two or more measuring devices are sequentially arranged in the pipeline from bottom to top, an inclined rod is provided on the diagonal line of the support frame of each measuring device, and a sensor for measuring the length change of the inclined rod is provided on the inclined rod, each sensor is connected to the acquisition and transmission device, and the acquisition and transmission device sends the measurement data from each sensor to a cloud server, thereby realizing multi-point synchronous measurement of the lateral deformation of the foundation pit retaining structure.

Description

Technical Field

[0001] The invention belongs to the field of building construction monitoring, and in particular relates to a multi-point synchronous automatic measurement system for lateral deformation of foundation pit enclosures. Background Art

[0002] The lateral deformation of existing foundation pit soil is mostly measured using the inclinometer method. This inclinometer method consists of an inclinometer (with a pulley) installed in an inclinometer tube. When the surrounding soil undergoes lateral displacement, the inclinometer tube is driven to deform laterally. The inclinometer consists of a measuring rod and a roller. The measuring rod and the inclinometer tube are fastened together by a track. The measuring rod is equipped with an angle sensor that can measure the angle of the measuring rod relative to the vertical line of gravity. The lateral deformation of the inclinometer tube can be calculated by the angle and the distance between the measuring rod, thereby achieving the purpose of measuring deep soil displacement. This measurement method is simple and convenient, but it is affected by many factors such as sensor accuracy, the quality of the buried inclinometer tube, and the clamping condition of the sensor and the inclinometer tube. In addition, since this method requires multiple measurements with a single sensor or the installation of multiple sensors to obtain the overall displacement of the soil in the depth direction, it is bound to bring about a large cumulative error.

[0003] This method requires external forces to lower and raise a single instrument, making real-time measurement impossible. When using multiple sensors simultaneously for real-time measurement, each sensor requires a separate cable for signal transmission because they are installed in parallel. This is limited by the diameter of the inclinometer tube, limiting the number of sensors that can be deployed. This, to a certain extent, impacts measurements of deep foundation pit soil. Summary of the Invention

[0004] The present invention aims to provide a multi-point synchronous automated measurement system for the lateral deformation of foundation pit retaining walls, so as to solve the problem of multi-point synchronous measurement of the deformation of retaining walls over the entire depth range during foundation pit excavation, improve the measurement accuracy and real-time performance of retaining wall deformation, and reduce the risk of foundation pit excavation construction.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A multi-point synchronous automated measurement system for lateral deformation of a foundation pit retaining structure, comprising a pipeline, two or more measuring devices and an acquisition and transmission device, each measuring device comprising a support frame, an inclined rod and a sensor, the pipeline being buried in the foundation pit retaining structure, the cross section of the pipeline being rectangular, the interior of the pipeline being provided with relatively arranged slots for fixing the support frame, the slots being arranged along the axial length of the pipeline, the bottom of the slots being provided with a bottom plate, the support frame comprising four rods, the four rods comprising two horizontal rods of equal length and two vertical rods of equal length, adjacent rods being connected by a rotating shaft to form a rectangular structure, and adjacent rods being able to rotate with each other, the two or more measuring devices being arranged in sequence in the pipeline from bottom to top, the support frame being perpendicular to the side wall of the foundation pit retaining structure, an inclined rod being arranged on the diagonal line of the support frame of each measuring device, the inclined rod being provided with the sensor for measuring the change in length of the inclined rod, each sensor being connected to the acquisition and transmission device, and the acquisition and transmission device sending the measurement data from each sensor to a cloud server.

[0007] Preferably, in the above-mentioned multi-point synchronous automatic measurement system for lateral deformation of foundation pit retaining wall, the measuring devices in the pipeline are the first measuring device, the second measuring device, ..., and the nth measuring device from bottom to top, and the sizes of all measuring devices are the same, wherein the lateral horizontal deformation x of the top of any i-th measuring device relative to its bottom is i yes

[0008] x i =L'×(M 2 +L i ' 2 -N 2 )÷(2ML i ')-M

[0009] Where M is the length of the horizontal rod, N is the length of the vertical rod, and L is the length of the inclined rod of each measuring device in the initial state. i ' is the length of the oblique rod of the i-th measuring device after deformation, n ≥ 2, i∈[1,n].

[0010] Preferably, in the above-mentioned multi-point synchronous automatic measurement system for lateral deformation of foundation pit retaining wall, the total lateral horizontal displacement X of the top of any i-th measuring device relative to the bottom of the lowest measuring device is i for

[0011] X i =x1+x2+x3+···+x i

[0012] Among them, the lateral horizontal deformation of the top of each measuring device relative to its bottom from bottom to top is x1, x2, x3...xn , i∈[1,n].

[0013] Preferably, in the above-mentioned multi-point synchronous automatic measurement system for lateral deformation of foundation pit retaining wall, the method for obtaining the total lateral horizontal deformation A at the depth Q position is as follows:

[0014] Calculate the height of each measuring device after deformation, the height of the i-th measuring device after deformation h i for

[0015]

[0016] Calculate the total height of each measuring device after deformation. The total height of the top of the i-th measuring device after deformation is H i for

[0017] H i =h1+h2+h3+···+h i

[0018] Compare the depth Q to the total height after deformation of the tops of all measuring devices to find H m-1 ≤Q≤H m When the relationship is , it means that the depth Q is within the depth range where the mth measuring device is located, n ≥ m ≥ 2;

[0019] Then the total lateral horizontal deformation A at depth Q is

[0020] A=x1+x2+x3+···+x m-1 +x m -(H m -Q)×x m / h m

[0021] Among them, x m-1 is the lateral horizontal deformation of the top of the m-1th measuring device relative to its bottom, x m is the lateral horizontal deformation of the top of the mth measuring device relative to its bottom, h m is the height of the mth measuring device after deformation, H m is the total height of the top of the mth measuring device after deformation.

[0022] Preferably, in the above-mentioned multi-point synchronous automatic measurement system for lateral deformation of foundation pit retaining wall, an elastic support point is respectively provided at the four corner positions of the support frame.

[0023] Preferably, in the above-mentioned multi-point synchronous automatic measurement system for lateral deformation of foundation pit retaining wall, the inclined rod is divided into two rod segments, and the two rod segments are connected into a whole through the sensor.

[0024] Preferably, in the above-mentioned multi-point synchronous automatic measurement system for lateral deformation of foundation pit retaining wall, the sensor can be compressed and extended, and the elastic coefficient of the sensor is much smaller than the elastic modulus of the diagonal rod.

[0025] Preferably, in the above-mentioned multi-point synchronous automated measurement system for lateral deformation of foundation pit retaining wall, adjacent measuring devices are connected by bolts, and a pair of bolt holes for connecting the cross bars of adjacent measuring devices are provided on the cross bar.

[0026] It can be seen from the technical solutions disclosed above that, compared with the prior art, the present invention has the following beneficial effects:

[0027] The present invention provides a multi-point synchronous automatic measurement system for the lateral deformation of a foundation pit retaining wall, comprising a pipeline, two or more measuring devices and an acquisition and transmission device, wherein each measuring device comprises a support frame, an inclined rod and a sensor, wherein the pipeline is buried in the foundation pit retaining wall structure, the cross section of the pipeline is rectangular, and the interior of the pipeline is provided with relatively arranged card slots for fixing the support frame, the card slots are arranged along the axial length of the pipeline, and a bottom plate is provided at the bottom of the card slots, the support frame comprises four rods, and the four rods comprise two horizontal rods of equal length and two vertical rods of equal length, and adjacent rods are connected by a rotating shaft to form a A rectangular structure, adjacent rods can rotate with each other, the two or more measuring devices are arranged in sequence in the pipe from bottom to top, the support frame is perpendicular to the side wall of the foundation pit retaining structure, and an inclined rod is arranged on the diagonal line of the support frame of each measuring device, and the inclined rod is provided with a sensor for measuring the change in the length of the inclined rod. Each sensor is connected to the acquisition and transmission device, and the acquisition and transmission device sends the measurement data from each sensor to the cloud server, so as to realize the lateral deformation measurement of the foundation pit retaining structure, improve the measurement accuracy of the retaining deformation and the real-time performance of the measurement, and reduce the risk of foundation pit excavation construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram (elevation diagram) of a multi-point synchronous automatic measurement system for lateral deformation of foundation pit retaining wall according to the present invention.

[0029] Figure 2 It is a top-down schematic diagram of the measuring device and pipelines within the foundation pit retaining structure.

[0030] Figure 3 It is a structural diagram of the measuring device.

[0031] Figure 4 is a cross-sectional view of the pipe.

[0032] Figure 5 It is a schematic diagram of the assembly of the measuring device and the pipeline.

[0033] Figure 6 It is a schematic diagram of the dimensions of the measuring device in the initial state (before deformation).

[0034] Figure 7 It is one of the schematic diagrams of the dimensions of the measuring device after deformation.

[0035] Figure 8 This is the second schematic diagram of the dimensions of the measuring device after deformation.

[0036] Figure 9 It is a schematic diagram of the deformation at depth Q on the multi-point synchronous automated measurement system for lateral deformation of foundation pit retaining wall.

[0037] In the figure: 1-pipeline, 11-slot, 2-measuring device, 21-cross bar, 22-vertical bar, 23-diagonal bar, 24-sensor, 25-rotating shaft, 26-elastic support point, 27-bolt hole, 3-acquisition and transmission device, 4-foundation pit retaining structure, 41-side wall, 5-data line, 6-bus. DETAILED DESCRIPTION

[0038] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The following examples, combined with the accompanying drawings, will provide a detailed description of the technical content and features of the present invention. It should be noted that the drawings are all in a very simplified form and are not precisely proportioned, and are only used to conveniently and clearly assist in illustrating the purpose of the embodiments of the present invention. For ease of description, the "upper" and "lower" described below are consistent with the upper and lower directions in the accompanying drawings, but this does not constitute a limitation of the technical solution of the present invention.

[0039] See also Figures 1 to 9The present embodiment discloses a multi-point synchronous automatic measurement system for lateral deformation of foundation pit retaining wall, comprising a pipeline 1, two or more measuring devices 2 and a data acquisition and transmission device 3. Each measuring device 2 comprises a support frame (not shown), an inclined rod 23 and a sensor 24. The pipeline 1 is buried in the foundation pit retaining wall 4. The cross section of the pipeline 1 is rectangular. The pipeline 1 has relatively arranged slots 11 for fixing the support frame. The slots 11 are arranged along the axial length of the pipeline 1. The bottom of the slots 11 is provided with a bottom plate (not shown). The support frame comprises four rods, and the four rods include two cross rods 2 of equal length. 1 and two vertical rods 22 of equal length, adjacent rods are connected by a rotating shaft 25 to form a rectangular structure, and adjacent rods can rotate with each other. The two or more measuring devices 2 are sequentially arranged in the pipeline 1 from bottom to top, and the support frame is perpendicular to the side wall 41 of the foundation pit retaining structure 4. An inclined rod 23 is set on the diagonal line of the support frame of each measuring device 2, and the inclined rod 23 is provided with the sensor 24 for measuring the length change of the inclined rod 23. Each sensor 24 is connected to the acquisition and transmission device 3, and the acquisition and transmission device 3 sends the measurement data from each sensor 24 to the cloud server (not shown).

[0040] The present invention provides a multi-point synchronous automated measurement system for lateral deformation of foundation pit retaining wall, comprising a pipeline 1, two or more measuring devices 2 and an acquisition and transmission device 3, each measuring device 2 comprising a support frame, an inclined rod 23 and a sensor 24, the pipeline 1 being buried in the foundation pit retaining wall structure 4, the cross section of the pipeline 1 being rectangular, the interior of the pipeline 1 being provided with relatively arranged card slots 11 for fixing the support frame, the card slots 11 being arranged along the axial length of the pipeline 1, the bottom of the card slots 11 being provided with a bottom plate, the support frame comprising four rods, the four rods comprising two horizontal rods 21 of equal length and two vertical rods 22 of equal length, adjacent rods being connected by a rotating shaft 25 It forms a rectangular structure, and adjacent rods can rotate with each other. The two or more measuring devices 2 are arranged in sequence in the pipe 1 from bottom to top, and the support frame is perpendicular to the side wall 41 of the foundation pit retaining structure 4. An inclined rod 23 is set on the diagonal line of the support frame of each measuring device 2, and the inclined rod 23 is provided with a sensor 24 for measuring the length change of the inclined rod 23. Each sensor 24 is connected to the acquisition and transmission device 3, and the acquisition and transmission device 3 sends the measurement data from each sensor 24 to the cloud server, so as to realize the lateral deformation measurement of the foundation pit retaining structure 4, improve the measurement accuracy of the retaining deformation and the real-time performance of the measurement, and reduce the risk of foundation pit excavation construction.

[0041] Please refer to Figures 6 to 8In the initial state of each measuring device 2, the three sides of the three-level concave △ABC composed of the horizontal rod 21, the vertical rod 22 and the oblique rod 23 are M, N, and L respectively. After deformation, the three sides are M, N, and L' respectively, where M is the length of the horizontal rod 21, N is the length of the vertical rod 22, L is the length of the oblique rod 23 of the measuring device 2 in the initial state, L' is the length of the oblique rod 23 of the measuring device 2 after deformation, and β is the angle between the oblique rod and the horizontal rod after the measuring device is deformed.

[0042] According to the cosine theorem:

[0043] N 2 =M 2 +L' 2 -2ML'cosβ

[0044] Then, cosβ=(M 2 +L' 2 -N 2 )÷(2ML')

[0045] At this time, △ADC is a right triangle, and the length of the side AD can be calculated as

[0046] AD=L'*cosβ

[0047] Then, the lateral horizontal deformation X of the top of a single measuring device 2 relative to its bottom is

[0048] X=AD-M

[0049] x=L'*cosβ-M

[0050] We can get: x=L'*[(M 2 +L' 2 -N 2 )÷(2ML')]-M

[0051] Preferably, in the above-mentioned multi-point synchronous automated measurement system for lateral deformation of foundation pit retaining wall, the measuring devices 2 in the pipeline 1 are, from bottom to top, the first measuring device, the second measuring device, ..., and the nth measuring device, and the sizes of all measuring devices 2 are the same, wherein the lateral horizontal deformation x of the top of any i-th measuring device relative to its bottom is i yes

[0052] x i =L'×(M 2 +Li' 2 -N 2 )÷(2MLi')-M

[0053] Wherein, M is the length of the horizontal rod 21, N is the length of the vertical rod 22, L is the length of the inclined rod 23 of each measuring device 2 in the initial state, L i' is the length of the oblique rod 23 of the i-th measuring device after deformation, n≥2, i∈[1,n].

[0054] Preferably, in the above-mentioned multi-point synchronous automatic measurement system for lateral deformation of foundation pit retaining wall, the total lateral horizontal displacement X of the top of any i-th measuring device 2 relative to the bottom of the lowest measuring device 2 is i for

[0055] X i =x1+x2+x3+···+x i

[0056] Among them, the lateral horizontal deformation of the top of each measuring device 2 relative to its bottom from bottom to top is x1, x2, x3...x n , i∈[1,n].

[0057] In this way, the total lateral horizontal displacement of the top of a single measuring device relative to the bottom of the lowest measuring device 2 can be calculated. The calculated result may contain positive and negative values. The positive and negative values ​​of the deformation direction can be manually specified during implementation. In this invention, deformation to the left is considered "+" and deformation to the right is considered "-." By simultaneously measuring the total lateral horizontal displacement of the top of each measuring device relative to the bottom of the lowest measuring device 2, this method allows for multi-point simultaneous measurement of the lateral deformation data of the foundation pit retaining structure 4. This allows for accurate assessment of foundation pit safety risks and effectively reduces accidents during excavation.

[0058] Preferably, in the above-mentioned multi-point synchronous automatic measurement system for lateral deformation of foundation pit retaining wall, the method for obtaining the total lateral horizontal deformation A at the depth Q position is as follows:

[0059] Calculate the height of each measuring device 2 after deformation, the height of the i-th measuring device 2 after deformation h i for

[0060]

[0061] Calculate the total height of each measuring device 2 after deformation, that is, calculate the distance between the top of each measuring device and the bottom of the lowest measuring device after the foundation pit retaining structure undergoes lateral deformation. The total height H of the top of the i-th measuring device after deformation is i for

[0062] H i =h1+h2+h3+···+h i

[0063] Compare the depth Q with the total height of the tops of all measuring devices 2 after deformation. That is, compare the depth Q position with the total height of the tops of all measuring devices 2 after deformation. The depth Q position refers to the position at the bottom of the lowest measuring device, which is Q distance upwards. Find H m-1 ≤Q≤H m When the relationship is , it means that the depth Q is within the depth range where the mth measuring device is located, n ≥ m ≥ 2;

[0064] At this time, the horizontal displacement P of the depth Q position on the mth measuring device relative to the bottom of the mth measuring device is calculated by interpolation as follows:

[0065] (H m -Q) / h m =P / x m

[0066] P=(H m -Q)×x m / h m

[0067] Then the total lateral horizontal deformation A at depth Q is

[0068] A=x1+x2+x3+···+x m-1 +x m -P

[0069] Finally got

[0070] A=x1+x2+x3+···+x m-1 +x m -(H m -Q)×x m / h m

[0071] Where, x1 is the lateral horizontal deformation of the top of the first measuring device relative to its bottom, x2 is the lateral horizontal deformation of the top of the second measuring device relative to its bottom, x3 is the lateral horizontal deformation of the top of the third measuring device relative to its bottom, and x m-1 is the lateral horizontal deformation of the top of the m-1th measuring device relative to its bottom, x m is the lateral horizontal deformation of the top of the mth measuring device relative to its bottom, h m is the height of the mth measuring device after deformation, H m It is the total height after the deformation of the top of the mth measuring device, that is, the distance between the top of the mth measuring device and the bottom of the lowest measuring device after the foundation pit retaining structure undergoes lateral deformation.

[0072] In this way, the lateral horizontal deformation of the foundation pit retaining structure 4 at any depth can be monitored, and the overall lateral deformation data of the foundation pit can be measured synchronously at multiple points, effectively reducing the occurrence of accidents during the foundation pit excavation process.

[0073] Preferably, in the above-mentioned multi-point synchronous automatic measurement system for lateral deformation of foundation pit retaining wall, each of the four corners of the support frame is provided with an elastic support point 26. The elastic support points 26 are located at the four corners of the support frame and are mainly used to keep the support frame in close contact with the pipeline 1.

[0074] Preferably, in the above-mentioned multi-point synchronous automatic measurement system for lateral deformation of foundation pit retaining wall, the material of the inclined rod 23 is the same as that of the support frame, and the inclined rod 23 is divided into two rod segments, which are connected into a whole through the sensor 24.

[0075] Preferably, in the aforementioned multi-point synchronous automated measurement system for lateral deformation of foundation pit retaining wall, the sensor 24 is a sensor 24 capable of measuring length change, capable of compression and extension, with an elastic coefficient much smaller than the elastic modulus of the diagonal rod 23. The sensor 24 is a length measuring sensor made of an elastic material. When the diagonal rod is subjected to an external force, the elastic material deforms. This deformation causes a change in the electrical resistance of the elastic material, and the length measuring sensor uses this change in resistance to measure its own length change, thereby obtaining the overall length change of the diagonal rod.

[0076] Preferably, in the above-mentioned multi-point synchronous automated measurement system for lateral deformation of foundation pit retaining wall, adjacent measuring devices 2 are connected by bolts, and a pair of bolt holes 27 for connecting the cross bars of adjacent measuring devices are provided on the cross bar 21 .

[0077] The method for installing and using a multi-point synchronous automatic measurement system for lateral deformation of a foundation pit enclosure of this embodiment includes the following steps:

[0078] Step 1: Set the length of the pipe 1 according to the depth of the foundation pit retaining structure 4, tie the pipe 1 to the steel cage of the underground continuous wall so that one side of the pipe 1 is parallel to the side wall 41 of the foundation pit retaining structure 4, and after the pipe 1 is sealed, lower it into the underground continuous wall groove along with the steel cage, and then pour concrete to form the foundation pit retaining structure 4;

[0079] Step 2, determine the number of measuring devices 2 according to the length of the pipeline 1, and put the measuring devices 2 into the pipeline 1 from bottom to top, each measuring device 2 includes a support frame, an inclined rod 23 and a sensor 24, the support frame includes four rods, the four rods include two horizontal rods 21 of equal length and two vertical rods 22 of equal length, adjacent rods are connected by a rotating shaft 25 to form a rectangular structure, and adjacent rods can rotate with each other, and an inclined rod 23 is set on the diagonal line of the support frame, and the two ends of the inclined rod 23 are respectively hinged to the diagonal of the support frame, and the inclined rod 23 is provided with the sensor 24 for measuring the length change of the inclined rod 23, each sensor 24 is numbered, and the number and order of each sensor 24 are recorded. Each sensor 24 is connected to the bus 6 through a data line 5, and the support frame placed in the pipeline 1 is perpendicular to the side wall 41 of the foundation pit retaining structure 4;

[0080] Step 3: Connect a data acquisition and transmission device 3 to the bus 6 so that each sensor 24 is connected to the data acquisition and transmission device 3, and test whether the connection between the sensor 24 and the data acquisition and transmission device 3 and their respective functions are normal;

[0081] Step 4: After the foundation pit retaining structure 4 is stabilized and before the foundation pit is excavated, the initial value of the sensor 24 of each measuring device 2 is read, and a certain frequency is set to automatically collect data. Assuming that the bottom of the lowest measuring device 2 has not moved horizontally, calculation and analysis are performed based on real-time data, and a real-time horizontal deformation curve of the depth direction of the foundation pit retaining structure 4 is drawn based on the analysis data. The overall lateral deformation data of the foundation pit can be measured synchronously at multiple points to realize the monitoring of the lateral horizontal deformation of the foundation pit retaining structure 4 at any depth, effectively reducing the occurrence of accidents during the foundation pit excavation process, improving the measurement accuracy of the retaining deformation and the real-time measurement, and reducing the risk of foundation pit excavation construction.

[0082] In summary, the present invention is composed of pipes buried inside the enclosure structure, support frames, diagonal bars, sensors installed on the diagonal bars, and data collection and transmission devices. The four rods of the support frame are connected by a rotating shaft and can rotate with each other. When the pipe is deformed along with the enclosure structure, it drives the support frame to rotate laterally. At this time, the sensor on the diagonal bar measures the elongation of the diagonal bar. The angle between the diagonal bar and the cross bar can be calculated by the triangle cosine theorem. Finally, the horizontal displacement of the support frame caused by the lateral rotation is solved according to the triangle relationship. The deformation of the overall direction of the enclosure structure is formed by connecting multiple monitoring devices end to end to form a string. By superimposing the lateral deformation of each device, the overall deformation data is formed, which solves the problem of multi-point synchronous measurement of the deformation of the enclosure in the full depth range during foundation pit excavation, improves the measurement accuracy of enclosure deformation and the real-time measurement, and reduces the risk of foundation pit excavation construction.

[0083] The above description is only a description of the preferred embodiments of the present invention and does not limit the scope of the present invention. Any changes and modifications made by ordinary technicians in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A multi-point synchronous automatic measurement system for lateral deformation of foundation pit retaining wall, characterized in that: The invention comprises a pipeline, two or more measuring devices and an acquisition and transmission device, each measuring device comprising a support frame, an inclined rod and a sensor, the pipeline is buried in a foundation pit retaining structure, the cross section of the pipeline is rectangular, the interior of the pipeline is provided with relatively arranged slots for fixing the support frame, the slots are arranged along the axial length of the pipeline, the bottom of the slots is provided with a bottom plate, the support frame comprises four rods, the four rods comprise two horizontal rods of equal length and two vertical rods of equal length, adjacent rods are connected by a rotating shaft to form a rectangular structure, and adjacent rods can rotate with each other, the two or more measuring devices are arranged in sequence in the pipeline from bottom to top, the horizontal rods of the support frame are perpendicular to the side walls of the foundation pit retaining structure, an inclined rod is arranged on the diagonal line of the support frame of each measuring device, the inclined rod is provided with the sensor for measuring the change in the length of the inclined rod, each sensor is connected to the acquisition and transmission device, and the acquisition and transmission device sends the measurement data from each sensor to a cloud server.

2. The multi-point synchronous automatic measurement system for lateral deformation of foundation pit retaining wall according to claim 1 is characterized in that: The measuring devices in the pipeline are the first measuring device, the second measuring device, ..., and the nth measuring device from bottom to top. The sizes of all measuring devices are the same. The lateral horizontal deformation x of the top of any i-th measuring device relative to its bottom is i yes x i =L'×(M 2 +L i ' 2 -N 2 )÷(2ML i ')-M Where M is the length of the horizontal rod, N is the length of the vertical rod, L is the length of the diagonal rod of each measuring device in the initial state, Li' is the length of the diagonal rod of the i-th measuring device after deformation, n ≥ 2, i ∈ [1, n].

3. The multi-point synchronous automatic measurement system for lateral deformation of foundation pit retaining wall according to claim 2 is characterized in that: The total lateral horizontal displacement X of the top of any i-th measuring device relative to the bottom of the lowest measuring device i for X i =x1+x2+x3+···+x i Among them, the lateral horizontal deformation of the top of each measuring device relative to its bottom from bottom to top is x1, x2, x3...x n , i∈[1,n].

4. The multi-point synchronous automatic measurement system for lateral deformation of foundation pit retaining wall according to claim 2 is characterized in that: The method for obtaining the total lateral horizontal deformation A at the depth Q position is as follows: Calculate the height of each measuring device after deformation, the height of the i-th measuring device after deformation h i for Calculate the total height of each measuring device after deformation. The total height of the top of the i-th measuring device after deformation is H i for H i =h1+h2+h3+···+h i Compare the depth Q to the total height after deformation of the tops of all measuring devices to find H m-1 ≤Q≤H m When the relationship is , it means that the depth Q is within the depth range where the mth measuring device is located, n ≥ m ≥ 2; Then the total lateral horizontal deformation A at depth Q is A=x1+x2+x3+···+x m-1 +x m -(H m -Q)×x m / h m Among them, x m-1 is the lateral horizontal deformation of the top of the m-1th measuring device relative to its bottom, x m is the lateral horizontal deformation of the top of the mth measuring device relative to its bottom, h m is the height of the mth measuring device after deformation, H m is the total height of the top of the mth measuring device after deformation.

5. The multi-point synchronous automatic measurement system for lateral deformation of foundation pit retaining wall according to claim 1 is characterized in that: An elastic supporting point is respectively provided at the four corner positions of the supporting frame.

6. The multi-point synchronous automatic measurement system for lateral deformation of foundation pit retaining wall according to claim 1 is characterized in that: The oblique rod is divided into two rod sections, and the two rod sections are connected into a whole through the sensor.

7. The multi-point synchronous automatic measurement system for lateral deformation of foundation pit retaining wall according to claim 1 is characterized in that: Adjacent measuring devices are connected by bolts, and a pair of bolt holes for connecting the cross bars of adjacent measuring devices are provided on the cross bar.

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