A rapid detection device and method for the misalignment amount between segments of a shield tunnel

Abstract

The present invention provides a rapid detection device and method for the offset amount between segments of a shield tunnel section. A detection trolley and an offset detection wheel set are adopted. The shield tunnel section is formed by sequentially assembling a plurality of tunnel segments in the circumferential and longitudinal directions. The offset detection wheel set includes a main wheel, a secondary wheel, an angle sensor, a main rod, a secondary rod and a support rod. One end of the support rod is fixedly connected to the detection trolley, and the other end of the support rod is connected to one end of the main rod. The main wheel is arranged at the other end of the main rod. The support rod can make the main wheel always in close contact with the surface of the tunnel segment. The connection between the support rod and the main rod is hinged to one end of the secondary rod, and the secondary wheel is arranged at the other end of the secondary rod. Through the offset detection wheel set, the angle between the main rod and the secondary rod is automatically scanned in combination with the traveling track of the detection trolley, so as to efficiently detect the offset amount between adjacent tunnel segments along the shield tunnel, reduce the workload of manual maintenance, and effectively improve the detection efficiency and detection accuracy of the offset amount.

Description

Technical Field

[0001] The present invention relates to the field of shield tunnel engineering inspection, and particularly to a rapid inspection device and method for the misalignment amount between segments of a shield tunnel section. Background Art

[0002] Shield tunnels are widely used in the construction of major urban infrastructure such as subway lines and water supply pipe networks. Shield tunnels generally form a lining structure by segment assembly to resist the soil and water pressure of the stratum. This structural form results in a large number of joint seams in shield tunnels. These joint seams are often the concentrated positions of stress. Especially in soft soil and water-rich areas, these joint seams are also the weak links where tunnel leakage occurs. Therefore, the detection of the misalignment and opening amount between segments is an important indicator for the service performance of the current tunnel structure.

[0003] Traditional shield tunnel quality inspections are all carried out by arranging personnel for regular inspections, including: manual measurement, photographing and sampling, manual recording, and data sorting and analysis, etc. This work has a huge workload, and since it is mostly completed during the night shutdown period, it is easy to cause missed inspections due to personnel slackness, operation negligence, etc., and the current state of the shield tunnel cannot be accurately grasped.

[0004] In recent years, automated and intelligent monitoring technologies in shield tunnel quality inspections have also been continuously developed and applied, but there is still no effective method for indicators such as the misalignment and opening amount between segments. Summary of the Invention

[0005] The present invention aims to invent a rapid inspection device and method for the misalignment amount between segments of a shield tunnel section to solve the problems of large workload and low efficiency in existing tunnel maintenance.

[0006] To solve the above technical problems, the present invention provides the following technical solutions:

[0007] A rapid detection device for the offset between segments of a shield tunnel section, comprising: a detection trolley capable of traveling in a shield tunnel section and an offset detection wheel set. The shield tunnel section is assembled by a number of tunnel segments in a circumferential and longitudinal sequence. The offset detection wheel set includes a main wheel, a secondary wheel, an angle sensor, a main rod, a secondary rod and a support rod. One end of the support rod is fixedly connected to the detection trolley, and the other end of the support rod is connected to one end of the main rod. The central axis of the support rod is collinear with that of the main rod, and the central axis of the support rod passes through the center of the cross-section of the tunnel, so that the main rod is always perpendicular to the tunnel segment. The main wheel is arranged at the other end of the main rod, and the support rod can make the main wheel always in close contact with the surface of the tunnel segment. The connection between the support rod and the main rod is hinged to one end of the secondary rod, and the secondary wheel is arranged at the other end of the secondary rod. The angle sensor is arranged at the connection between the main rod and the secondary rod, and the angle sensor can measure the angle between the main rod and the secondary rod.

[0008] Preferably, in the above rapid detection device for the offset between segments of a shield tunnel section, when there is an offset between longitudinally adjacent tunnel segments, the offset δ between longitudinally adjacent tunnel segments is δ = |R1×cosθ - R0|, where R0 is the length of the main rod, R1 is the length of the secondary rod, and θ is the angle between the main and secondary wheels, and the angle between the main and secondary wheels represents the angle between the main rod and the secondary rod.

[0009] Preferably, in the above rapid detection device for the offset between segments of a shield tunnel section, the support rod includes a first rod, a second rod and a spring. The spring is arranged between the first rod and the second rod, and the spring has an elastic force that presses the first rod and the second rod outward. The spring enables the main wheel to always be in close contact with the surface of the tunnel segment through the action of the spring.

[0010] Preferably, in the above rapid detection device for the offset between segments of a shield tunnel section, a tension spring is arranged between the main rod and the secondary rod to make the secondary wheel always in close contact with the surface of the tunnel segment.

[0011] Preferably, in the above rapid detection device for the offset between segments of a shield tunnel section, a track is arranged along the shield tunnel, and rollers matching the track are arranged at the bottom of the detection trolley, and the detection trolley can travel along the track.

[0012] Preferably, in the above rapid detection device for the offset between segments of a shield tunnel section, an auxiliary positioning bracket for the detection wheel set is installed on the detection trolley.

[0013] Preferably, in the above rapid detection device for the offset between segments of a shield tunnel section, when the offset δ is greater than or equal to 1 centimeter, it indicates that the offset between adjacent tunnel segments along the tunnel exceeds the standard.

[0014] A rapid detection method for the stagger amount between segments of a shield tunnel section, comprising the following steps:

[0015] Step 1: Install the inspection trolley on the track in the shield tunnel and preliminarily level it. The bottom of the inspection trolley is provided with rollers matching the track.

[0016] Step 2: Install the corresponding number of stagger detection wheel sets on the inspection trolley according to the circumferential layout of the current tunnel segments. The stagger detection wheel set includes a main wheel, a sub-wheel, an angle sensor, a main rod, a sub-rod, and a support rod. One end of the support rod is fixedly connected to the inspection trolley, and the other end of the support rod is connected to one end of the main rod. The central axis of the support rod is collinear with that of the main rod, and the central axis of the support rod passes through the center of the cross-section of the tunnel, so that the main rod is always perpendicular to the tunnel segment. The main wheel is arranged at the other end of the main rod. The support rod can make the main wheel always closely adhere to the surface of the tunnel segment. One end of the sub-rod is hinged to the connection between the support rod and the main rod, and the sub-wheel is arranged at the other end of the sub-rod. The angle sensor is arranged at the connection between the main rod and the sub-rod, and the angle sensor can measure the included angle between the main rod and the sub-rod.

[0017] Step 3: During the forward movement of the inspection trolley, continuously record the monitoring values of the angle sensors in each stagger detection wheel set, and automatically generate the time history curve of the included angle θ between the main and sub-wheels.

[0018] Step 4: Through the time history curves of the included angle θ between the main and sub-wheels and the stagger amount calculation formula δ = |R1×cosθ - R0|, calculate the stagger amount between each adjacent pair of tunnel segments along the tunnel section one by one, where R0 is the length of the main rod and R1 is the length of the sub-rod.

[0019] Step 5: Statistically analyze and curve analyze the stagger amount data of each tunnel segment along the tunnel, identify the areas where the stagger amount exceeds the standard, and arrange for key risk investigation.

[0020] Preferably, in the above rapid detection method for the stagger amount between segments of a shield tunnel section, when the stagger amount δ is greater than or equal to 1 centimeter, it indicates that the stagger amount between adjacent tunnel segments along the tunnel exceeds the standard.

[0021] Preferably, in the above rapid detection method for the stagger amount between segments of a shield tunnel section, the support rod includes a first rod, a second rod, and a spring. The spring is arranged between the first rod and the second rod, and the spring has an elastic force that extrudes the first rod and the second rod outward. The spring enables the main wheel to always closely adhere to the surface of the tunnel segment through the action of the spring. Of course, the support rod can adopt other forms as long as it can stretch and ensure an outward extrusion force.

[0022] Preferably, in the above method for quickly detecting the offset amount between segments of a shield tunnel section, a tension spring is provided between the main rod and the auxiliary rod to keep the auxiliary wheel always in close contact with the surface of the tunnel segment.

[0023] As can be seen from the above disclosed technical solutions, compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] The present invention provides a device and method for quickly detecting the offset amount between segments of a shield tunnel section, which uses a detection trolley capable of traveling in a shield tunnel section and an offset detection wheel set. The shield tunnel section is formed by sequentially assembling a plurality of tunnel segments in the circumferential and longitudinal directions. The offset detection wheel set includes a main wheel, an auxiliary wheel, an angle sensor, a main rod, an auxiliary rod and a support rod. One end of the support rod is fixedly connected to the detection trolley, and the other end of the support rod is connected to one end of the main rod. The central axis of the support rod is collinear with the central axis of the main rod, and the central axis of the support rod passes through the center of the cross-section of the tunnel, so that the main rod is always perpendicular to the tunnel segment. The main wheel is arranged at the other end of the main rod. The support rod can keep the main wheel always in close contact with the surface of the tunnel segment. The connection between the support rod and the main rod is hinged to one end of the auxiliary rod, and the auxiliary wheel is arranged at the other end of the auxiliary rod. The angle sensor is arranged at the connection between the main rod and the auxiliary rod, and the angle sensor can measure the included angle between the main rod and the auxiliary rod. By installing an offset detection wheel set on the detection trolley, during the rapid movement of the detection trolley in the tunnel, through the offset detection wheel set, the included angle between the main rod and the auxiliary rod, which reflects the offset amount between adjacent tunnel segments along the tunnel, is automatically scanned, so as to efficiently detect the offset amount of each adjacent tunnel segment along the shield tunnel, reduce the manual maintenance workload, and effectively improve the detection efficiency and detection accuracy of the offset amount. Description of the Drawings

[0025] Figure 1 is a schematic structural diagram of a device for quickly detecting the offset amount between segments of a shield tunnel section according to the present invention.

[0026] Figure 2 is Figure 1 an enlarged schematic view of part A of

[0027] Figure 3 is a schematic structural diagram when there is no offset between longitudinally adjacent tunnel segments.

[0028] Figure 4 is a schematic structural diagram when there is an offset with the front lower and the rear higher between longitudinally adjacent tunnel segments.

[0029] Figure 5 is a schematic structural diagram when there is an offset with the front higher and the rear lower between longitudinally adjacent tunnel segments.

[0030] Figure 6It is a schematic diagram of the principle when the longitudinally adjacent tunnel segments have a stagger with the front lower and the rear higher.

[0031] Figure 7 It is a schematic diagram of the principle when the longitudinally adjacent tunnel segments have a stagger with the front lower and the rear higher.

[0032] In the figure: 1 - inspection trolley, 2 - tunnel segment, 3 - main wheel, 4 - auxiliary wheel, 5 - main rod, 6 - auxiliary rod, 7 - support rod, 71 - first rod, 72 - support rod spring, 73 - second rod, 8 - angle sensor, 9 - track, 10 - auxiliary positioning bracket. Specific implementation manner

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. The technical content and features of the present invention will be described in detail below with reference to the listed embodiments in conjunction with the accompanying drawings. It should be noted that the accompanying drawings are all in a very simplified form and use non-precise scales, only for the purpose of conveniently and clearly assisting in explaining the purpose of the embodiments of the present invention. For the convenience of description, the "upper" and "lower" described below are in the same direction as the upper and lower of the accompanying drawings, but this cannot be a limitation to the technical solution of the present invention.

[0034] Please refer to Figures 1 to 7 , this embodiment discloses a rapid detection device for the stagger amount between segments of a shield tunnel section, including: an inspection trolley 1 that can travel in the shield tunnel section and a stagger detection wheel set. The shield tunnel section is assembled by a plurality of tunnel segments in the circumferential and longitudinal directions in sequence. The number of the stagger detection wheel sets is equal to the circumferential number of the tunnel segments. The stagger detection wheel set includes a main wheel 3, an auxiliary wheel 4, an angle sensor, a main rod 5, an auxiliary rod 6, and a support rod 7. One end of the support rod 7 is fixedly connected to the inspection trolley, and the other end of the support rod 7 is connected to one end of the main rod 5. The central axis of the support rod 7 is collinear with the central axis of the main rod 5. The central axis of the support rod 7 passes through the center of the cross-section of the tunnel, so that the main rod 5 is always perpendicular to the tunnel segment 2. The main wheel 3 is arranged at the other end of the main rod 5. The support rod 7 can make the main wheel 3 always closely contact with the surface of the tunnel segment 2. The connection part between the support rod 7 and the main rod 5 is hinged to one end of the auxiliary rod 6, and the auxiliary wheel 4 is arranged at the other end of the auxiliary rod 6. The angle sensor is arranged at the connection part between the main rod 5 and the auxiliary rod 6, and the angle sensor can measure the included angle between the main rod 5 and the auxiliary rod 6.

[0035] A rapid detection device for the stagger amount between segments of a shield tunnel section provided by the present invention includes a detection trolley 1 capable of traveling in the shield tunnel section and a stagger detection wheel set. The shield tunnel section is assembled by a number of tunnel segments in sequence along the circumferential and longitudinal directions. The stagger detection wheel set includes a main wheel 3, a sub-wheel 4, an angle sensor, a main rod 5, a sub-rod 6, and a support rod 7. One end of the support rod 7 is fixedly connected to the detection trolley, and the other end of the support rod 7 is connected to one end of the main rod 5. The central axis of the support rod 7 is collinear with that of the main rod 5, and the central axis of the support rod 7 passes through the center of the cross-section of the tunnel, so that the main rod 5 is always perpendicular to the tunnel segment 2. The main wheel 3 is arranged at the other end of the main rod 5, and the support rod 7 can make the main wheel 3 always closely attached to the surface of the tunnel segment. The connection between the support rod 7 and the main rod 5 is hinged to one end of the sub-rod 6, and the sub-wheel 4 is arranged at the other end of the sub-rod 6. The angle sensor is arranged at the connection between the main rod 5 and the sub-rod 6, and the angle sensor can measure the included angle between the main rod 5 and the sub-rod 6. By installing the stagger detection wheel set on the detection trolley, during the rapid travel of the detection trolley in the tunnel, through the stagger detection wheel set, the included angle between the main rod 5 and the sub-rod 6, which reflects the stagger amount between adjacent tunnel segments 2 along the tunnel line, is automatically scanned, so as to efficiently detect the stagger amount between adjacent tunnel segments 2 along the shield tunnel line, reduce the manual maintenance workload, and effectively improve the detection efficiency and detection accuracy of the stagger amount.

[0036] Preferably, in the above rapid detection device for the stagger amount between segments of a shield tunnel section, when there is a stagger between longitudinally adjacent tunnel segments 2, the stagger amount δ between longitudinally adjacent tunnel segments 2 is δ = |R1×cosθ - R0|, where R0 is the length of the main rod 5, R1 is the length of the sub-rod 6, and θ is the included angle between the main and sub-wheels, and the included angle between the main and sub-wheels represents the included angle between the main rod 5 and the sub-rod 6.

[0037] Preferably, in the above rapid detection device for the stagger amount between segments of a shield tunnel section, when the stagger amount δ is greater than or equal to 1 cm, it indicates that the stagger amount between adjacent tunnel segments 2 along the tunnel line exceeds the standard, and construction personnel need to go for repair.

[0038] Preferably, in the above rapid detection device for the stagger amount between segments of a shield tunnel section, the support rod 7 includes a first rod 71, a second rod 73, and a support rod spring 72. The support rod spring 72 is arranged between the first rod 71 and the second rod 73, and the support rod spring 72 has an elastic force that extrudes the first rod 71 and the second rod 73 outward, and the main wheel 3 can always be closely attached to the surface of the tunnel segment through the action of the support rod spring 72.

[0039] Preferably, in the above-mentioned quick detection device for the stagger amount between segments of a shield tunnel section, a tension spring (not shown) for keeping the auxiliary wheel 4 always in close contact with the surface of the tunnel segment is provided between the main rod 5 and the auxiliary rod 6.

[0040] Preferably, to ensure the insufficient stiffness caused by the excessive length of the strut under certain special conditions, an auxiliary positioning bracket 10 for the detection wheel set can be installed on the inspection trolley to ensure the radial attitude of the detection wheel set is maintained.

[0041] Preferably, in the above-mentioned quick detection device for the stagger amount between segments of a shield tunnel section, a track 9 is arranged along the shield tunnel, and rollers matching the track 9 are provided at the bottom of the inspection trolley 1, and the inspection trolley 1 can travel along the track 9. By arranging the track 9, the inspection trolley 1 can travel along the existing line, improving the accuracy of detecting the stagger amount between the tunnel segments 2.

[0042] Preferably, in the above-mentioned quick detection device for the stagger amount between segments of a shield tunnel section, the number of the stagger detection wheel sets is equal to the circumferential number of the tunnel segments 2, so that when the inspection trolley 1 travels once, the stagger amounts between all adjacent tunnel segments 2 in the circumferential direction can be detected simultaneously, improving the detection efficiency.

[0043] Please refer to Figures 1 to 7 , this embodiment also discloses a quick detection method for the stagger amount between segments of a shield tunnel section. Using the above-mentioned quick detection device for the stagger amount between segments of a shield tunnel section, the method includes the following steps:

[0044] Step 1, install the inspection trolley 1 on the track 9 in the shield tunnel and level it preliminarily. Rollers matching the track 9 are provided at the bottom of the inspection trolley 1;

[0045] Step 2, install the corresponding number of stagger detection wheel sets on the inspection trolley 1 according to the circumferential arrangement of the current tunnel segments 2. The number of the stagger detection wheel sets is equal to the circumferential number of the tunnel segments. The stagger detection wheel set includes a main wheel 3, an auxiliary wheel 4, an angle sensor, a main rod 5, an auxiliary rod 6, and a strut 7. One end of the strut 7 is fixedly connected to the inspection trolley, and the other end of the strut 7 is connected to one end of the main rod 5. The central axis of the strut 7 is collinear with the central axis of the main rod 5. The central axis of the strut 7 passes through the center of the cross-section of the tunnel, so that the main rod 5 is always perpendicular to the tunnel segment. The main wheel 3 is arranged at the other end of the main rod 5. The strut 7 can keep the main wheel 3 always in close contact with the surface of the tunnel segment. One end of the connection between the strut 7 and the main rod 5 is hinged to one end of the auxiliary rod 6, and the auxiliary wheel 4 is arranged at the other end of the auxiliary rod 6. The angle sensor is arranged at the connection between the main rod 5 and the auxiliary rod 6, and the angle sensor can measure the included angle between the main rod 5 and the auxiliary rod 6;

[0046] Step 3: During the forward movement of the trolley 1, continuously record the monitoring values of the angle sensors in each misalignment detection wheel set, and automatically generate the time history curve of the included angle θ between the main and auxiliary wheels.

[0047] Step 4: Through the time history curves of the included angle θ between the main and auxiliary wheels and the misalignment amount calculation formula δ = |R1×cosθ - R0|, calculate the misalignment amount of each adjacent tunnel segment along the tunnel one by one, where R0 is the length of the main rod 5 and R1 is the length of the auxiliary rod 6.

[0048] Step 5: Statistically analyze and curve analyze the misalignment amount data of each tunnel segment 2 along the tunnel, identify the areas where the misalignment amount exceeds the standard, and arrange for key risk investigation.

[0049] Preferably, in the above rapid misalignment amount detection method for tunnel segments in a shield tunnel section, when the misalignment amount δ is greater than or equal to 1 cm, it indicates that the misalignment amount between adjacent tunnel segments 2 along the tunnel exceeds the standard.

[0050] Preferably, in the above rapid misalignment amount detection method for tunnel segments in a shield tunnel section, the strut 7 includes a first rod 71, a second rod 73, and a strut spring 72. The strut spring 72 is arranged between the first rod 71 and the second rod 73, and the strut spring 72 has an elastic force that presses the first rod 71 and the second rod 73 outward. Due to the acting force of the strut spring 72, the main wheel 3 can always be in close contact with the surface of the tunnel segment.

[0051] Preferably, in the above rapid misalignment amount detection method for tunnel segments in a shield tunnel section, a tension spring (not shown) is provided between the main rod 5 and the auxiliary rod 6 to make the auxiliary wheel 4 always in close contact with the surface of the tunnel segment.

[0052] Preferably, to ensure the stiffness deficiency caused by the excessive length of the strut under certain special conditions, an auxiliary positioning bracket 10 for the detection wheel set can be installed on the detection trolley to ensure the radial attitude of the detection wheel set is maintained.

[0053] 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 in any way. Any changes and modifications made by those of ordinary skill in the art of the present invention according to the above disclosure shall fall within the protection scope of the claims.

Claims

1. A rapid detection device for the misalignment amount between segments of a shield tunnel section, characterized in that Comprising: An inspection trolley capable of traveling in a shield tunnel section and a misalignment detection wheel set. The misalignment detection wheel set includes a main wheel, a sub-wheel, an angle sensor, a main rod, a sub-rod, and a support rod. One end of the support rod is fixedly connected to the inspection trolley, and the other end of the support rod is connected to one end of the main rod. The central axis of the support rod is collinear with the central axis of the main rod, and the central axis of the support rod passes through the center of the cross-section of the tunnel, so that the main rod is always perpendicular to the tunnel segment. The main wheel is arranged at the other end of the main rod. The support rod can make the main wheel always closely attached to the surface of the tunnel segment. The connection between the support rod and the main rod is hinged to one end of the sub-rod, and the sub-wheel is arranged at the other end of the sub-rod. The angle sensor is arranged at the connection between the main rod and the sub-rod. The angle sensor can measure the included angle between the main rod and the sub-rod. When there is a misalignment between longitudinally adjacent tunnel segments, the misalignment amount δ between longitudinally adjacent tunnel segments is δ = |R1×cosθ - R0|, where R0 is the length of the main rod, R1 is the length of the sub-rod, and θ is the included angle between the main and sub-wheels. The included angle between the main and sub-wheels represents the included angle between the main rod and the sub-rod. The support rod includes a first rod, a second rod, and a support rod spring. The support rod spring is arranged between the first rod and the second rod. The support rod spring has an elastic force that squeezes the first rod and the second rod outward. The spring enables the main wheel to always be closely attached to the surface of the tunnel segment through the action of the support rod spring. A tension spring is arranged between the main rod and the sub-rod to make the sub-wheel always closely attached to the surface of the tunnel segment.

2. The rapid detection device for the offset amount between segments of a shield tunnel section as described in claim 1, wherein Tracks are arranged along the shield tunnel. The bottom of the inspection trolley is provided with rollers matching the tracks, and the inspection trolley can travel along the tracks.

3. The rapid detection device for the offset amount between segments of a shield tunnel section as claimed in claim 1, wherein, When the misalignment amount δ is greater than or equal to 1 centimeter, it indicates that the misalignment amount between adjacent tunnel segments along the tunnel exceeds the standard.

4. The quick detection device for the stagger amount between segments of a shield tunnel section according to claim 1, wherein An auxiliary positioning bracket for the detection wheel set is installed on the inspection trolley.

5. A rapid detection method for the offset amount between segments of a shield tunnel section, which uses the rapid detection device for the offset amount between segments of a shield tunnel section described in any one of claims 1 to 4, and is characterized in that, Including the following steps: Step 1, install the inspection trolley on the tracks in the shield tunnel and preliminarily level it. The bottom of the inspection trolley is provided with rollers matching the tracks; Step 2: Install the corresponding number of stagger detection wheel sets on the inspection trolley according to the circumferential arrangement of the current tunnel segments. The stagger detection wheel set includes a main wheel, a sub-wheel, an angle sensor, a main rod, a sub-rod, and a support rod. One end of the support rod is fixedly connected to the inspection trolley, and the other end of the support rod is connected to one end of the main rod. The central axis of the support rod is collinear with the central axis of the main rod, and the central axis of the support rod passes through the center of the cross-section of the tunnel, so that the main rod is always perpendicular to the tunnel segment. The main wheel is arranged at the other end of the main rod. The support rod can make the main wheel always closely attached to the surface of the tunnel segment. The connection between the support rod and the main rod is hinged to one end of the sub-rod, and the sub-wheel is arranged at the other end of the sub-rod. The angle sensor is arranged at the connection between the main rod and the sub-rod, and the angle sensor can measure the included angle between the main rod and the sub-rod. The support rod includes a first rod, a second rod, and a spring. The spring is arranged between the first rod and the second rod, and the spring has an elastic force that squeezes the first rod and the second rod outward. The spring enables the main wheel to always be closely attached to the surface of the tunnel segment through the action of the spring; Step 3: During the forward movement of the inspection trolley, continuously record the monitoring values of the angle sensors in each stagger detection wheel set, and automatically generate the time history curve of the included angle θ between the main and sub-wheels; Step 4: Through the time history curves of the included angle θ between the main and sub-wheels and the stagger amount calculation formula δ = |R1×cosθ - R0|, calculate the stagger amount of each adjacent tunnel segment along the tunnel one by one, where R0 is the length of the main rod and R1 is the length of the sub-rod; Step 5: Statistically analyze and curve analyze the stagger amount data of each tunnel segment along the tunnel, identify the areas where the stagger amount exceeds the standard, and arrange for key risk investigation.

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