Shield station-crossing construction method capable of achieving layered backfill in small and narrow vertical shaft

Abstract

The invention discloses a shield station-crossing construction method capable of achieving layered backfill in a small and narrow vertical shaft. The method of layered backfill is adopted to form soilwith certain strength, a shield tunneling machine can simulate a normal strata for tunneling during station crossing, on the first layer, a hard backfill material is backfilled, it is ensured that the backfill material has the enough bearing force, the too large sinking generated by self weight during station crossing of the shield tunneling machine is prevented, on the second layer, an originalsoil layer is backfilled, the phenomenon that during station-crossing propelling of the shield tunneling machine, too large resistance is generated, and a pipe segment is structurally damaged is avoided, a cement pile in the backfill soil increases the shield body torque resistance during tunneling of the shield tunneling machine, and the tunneling posture of the shield tunneling machine can be ensured. The method greatly reduces receiving and starting risks during shield station crossing, the hole door water burst sand burst ground collapse risk can be avoided, shield concrete guide platformconstruction, hole door water stop device mounting and an end reinforcing grouting material can be reduced, meanwhile, the time for mounting of a guide platform and other station-crossing materials inthe small and narrow vertical shaft can be omitted, and the shield construction proceed can be improved.

Description

technical field [0001] The invention belongs to the technical field of shield tunneling station passing construction, and specifically discloses a shield tunneling station passing construction method for layered backfilling in a narrow vertical shaft. Background technique [0002] With the acceleration of the urbanization process, more and more urban power tunnels are being built. Due to the optimization and innovation of technical processes, the construction of power tunnels using the shield method is becoming more and more common. At present, the urban high-voltage cable lines are long, and there are many intermediate cable exit wells. Therefore, in the process of shield tunneling construction, it is necessary to pass through the wells continuously. Most of them are narrow shaft structures. The origination and reception are the first-level risk sources of shield tunneling construction. A slight inadvertence in the construction process will cause water and sand gushing, wh...

AI Technical Summary

Problems solved by technology

The origination and reception are the first-level risk sources of shield tunneling construction. A slight inadvertence in the construction process will cause water and sand gushing, which will lead to risks such as the shaft being flooded and the ground collapsing.

The conventional subway shield adopts the method of setting up the guide platform and carrying out the empty push of the shield to carry out the receiving and starting transit. However, in the narrow shaft, due to the limited space, it is difficult to carry out construction, which is time-consuming and labor-intensive. Therefore, it is urgently needed A safe and fast shield tunneling method in a narrow space

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