Improved CRD construction method tunnel construction process

Abstract

The invention relates to the technical field of building construction, and discloses an improved CRD construction method tunnel construction technology which comprises the following steps that S1, backfilling and back pressing are conducted on a collapse area; s2, a pipe shed is constructed at the bottom of the backfill area; s3, an arch cavity is backfilled and compacted through concrete; s4, excavating a left upper step, and primarily supporting the left parts of the longitudinal partition wall and the transverse partition wall to form a ring; s5, excavating an upper step on the right side, and primarily supporting the right side parts of the longitudinal partition wall and the transverse partition wall to form a ring; s6, the transverse partition walls and the longitudinal partition walls are dismantled; s7, excavating and supporting a lower step on the left side; s8, excavating and supporting a lower step on the right side; s9, arranging an inverted arch and filling concrete; according to the construction method, through back pressure backfilling of the collapse area and supporting of the backfilling area through the pipe shed, the firmness of the overall structure of the tunnel is good, the using amount of temporary supporting materials is reduced, the construction period is shortened, the spreading cost of tunnel excavation and supporting system equipment is reduced, and the construction efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of building construction, in particular to an improved CRD construction method tunnel construction technology. Background technique [0002] Tunnels are engineering structures buried in the ground, and it is a form of human utilization of underground space. Tunnels can be divided into traffic tunnels, hydraulic tunnels, municipal tunnels, mine tunnels, and military tunnels. [0003] For large-section karst tunnel vault collapse and mud outburst, backfill and back pressure reinforcement are generally used, and the middle partition (CD method), the cross-medium partition method (CRD method), and the single and double side wall guide pit methods are used for excavation. These methods are used for excavation. The advantage is that it is beneficial to support the collapsed body and control the subsidence of the surrounding rock of the vault, but often in large-section karst tunnels, the rock layer is hard, excep...

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Problems solved by technology

[0003] For large-section karst tunnel vault collapse and mud outbursts, backfill and backpressure are generally used for reinforcement, and middle partition (CD method), cross middle partition method (CRD method), and single and double sidewall pilot pit methods are used for excavation. The advantage is that it is beneficial to support the collapsed body and well control the subsidence of the surrounding rock of the vault. However, in large-section karst tunnels, the rock formation is hard, and the surrounding rock is relatively stable except for the collapsed body. The conventional CD method, The disadvantages of the CRD method and the single and double side wall pilot pit method are that there are many auxiliary construction procedures, complex structural stress, large amount of temporary support materials and slow construction progress.

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