Construction method of expansion and reconstruction of shield tunnel door

Abstract

The invention relates to a construction method for expanding the diameter of a shield tunnel door, which is used for the construction in which the diameter of the original hole ring is 6700 mm and the diameter of the hole ring after the expansion is 7100 mm. The steps are: (1) setting out the center of the designed hole; (2) After the positioning and lay-out is completed, the original hole ring steel plate and inner lining shall be chiseled according to the chiseling line; (4) Divide the steel plate of the hole ring into six equal parts and fix them on the wall. Each steel plate is initially positioned at both ends. After all the steel plates are initially fixed on the wall, the hole ring is adjusted The roundness and inner diameter are checked and reviewed and adjusted according to the review results. The construction method of the present invention avoids the shortcomings and risks of the previous construction methods, reduces the workload, and reduces the construction risk. Applicable to all working conditions of similar projects.

Description

technical field [0001] The invention relates to a construction method for expanding the diameter of a tunnel door, which is applied to the connecting position of new and old sections of a rail transit line. Background technique [0002] In the rail transit project, due to the adjustment of the design and planning scheme of the new and old sections of the same line, the diameter of the tunnel in the newly designed section is larger than the diameter of the tunnel in the built section, so the section project connecting the new and old tunnels needs to use matching large diameters When the shield machine of the tunnel is under construction, the diameter of the originally constructed station door cannot meet the construction requirements of the large-diameter shield, so it is necessary to carry out diameter expansion reconstruction. In the past, similar constructions usually adopted two schemes: [0003] Option One: [0004] like figure 2 As shown in , 3, in the ground wall 1...

AI Technical Summary

Problems solved by technology

[0008] 3. The construction process is complicated and the operation time is long;

[0009] 4. Since the construction needs to chisel out the entire lining wall to the ground wall, construction risks such as ground wall leakage and structural deformation may occur

[0013] 1. Although the construction process has reduced the chisel removal process compared with plan 1, there are still subsequent processes such as planting bars and steel bar binding, which still require a long construction period;

[0014] 2. After the operation of "pasting cakes", there is an impact on the boundary size of the station, and the applicability is not strong

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