A fiber grating monitoring method and device for shield tunnel segment dislocation
A shield tunnel segment and fiber grating technology, which is applied in the field of tunnel segment staggered monitoring, can solve the problems of unfavorable project promotion and application, high cost, expensive 3D laser scanner equipment and processing software, etc. Simple and convenient effect
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Embodiment 1
[0052] Example 1. A fiber grating monitoring device for shield tunnel segment dislocation, such as figure 1 As shown, it includes: a connecting bolt 4 is installed between the two ring segments 7 for connecting the two ring segments 7; a nut mounting hole 1 is provided at the corresponding position of the segment 7, and both ends of the connecting bolt 4 are connected There is nut 2, and nut 2 is located in nut installation hole 1; a hole is drilled on nut 2 at a distance of 2 cm from the end of connecting bolt 4, and the fiber grating strain sensor 6 is pasted on connecting bolt 4 with epoxy adhesive.
[0053] Wherein, a fiber grating strain sensor 6 is installed on each connecting bolt 4 at the joint of the two ring segments 7 and parallel to the axis of the bolt, and the connecting lead and the optical fiber 5 are drawn out through the hole of the nut 2 and connected to each other. At the same time, the connecting bolt 4 is provided with a bolt washer 3 near both ends, and...
Embodiment 2
[0054] Example 2. A fiber grating monitoring method for shield tunnel segment dislocation, such as Figure 1-3 As shown, the operation steps are as follows:
[0055] a. Pre-drill holes on the nut at a distance of 2cm from the end of the connecting bolt;
[0056] b. Use epoxy adhesive to stick the fiber grating strain sensor on the connecting bolt. The installation method of the fiber grating strain sensor is that on each connecting bolt, the specified section (that is, the joint of the two ring segments) is parallel to the Install a fiber grating strain sensor in the direction of the bolt axis, and lead the connecting lead and fiber through the nut hole;
[0057] c. Number each connecting bolt and mark it on the lead of the connecting bolt to ensure the correct installation of the connecting bolt position;
[0058] d. After the shield tunneling is completed, assemble the segments according to the assembly sequence, install the corresponding connecting bolts in place, tighte...
Embodiment 3
[0085] Example 3. like Figure 4 As shown, it is the monitoring curve of the staggered platform deformation at the arch waist of K27+360.00 in a certain section of Wuhan Metro Line 7 in 2019. The parameter values of the calculation formula are shown in Table 1. from Figure 4 It can be seen that the accuracy of the displacement of the staggered platform is high, which can meet the accuracy requirements of subway operation monitoring; the maximum deformation is only about 0.064mm, which is compared with the manual monitoring performed during the same period (within the same cycle, the total station was manually measured twice) The result is Consistent, meet the subway safety operation requirements.
[0086] Table 1 List of calculation parameters
[0087]
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