Grouped second liner construction method for large cross-section tunnel

Abstract

The invention discloses a grouped second liner construction method for a large cross-section tunnel. A whole toroidal second liner is constructed after being divided into 6 parts. The method comprises the following steps: 1), pouring and backfilling an inverted arch of a left lower hole; 2), pouring and backfilling an inverted arch of a right lower hole; 3), pouring a side wall second liner of the left lower hole through a lower hole trolley; 4), moving the lower hole trolley to the right lower hole to pour a side wall second liner of the right lower hole; 5), erecting a bracket in the right lower hole, assembling a right upper hole trolley, and pouring a right upper arch second liner; 6), erecting a bracket in the left lower hole, assembling a left upper hole trolley, and pouring a left upper arch second liner. According to the grouped second liner construction method, a relatively large cross section is divided into a plurality of small cross sections to carry out construction, although the construction procedures the time limit for a product are slightly increased in comparison with those of a traditional two-step construction method, the construction risk is yet reduced to a great extent, the construction safety guarantee coefficient is increased, an extremely important guide value is provided for the tunnel constructed with a CRD (center cross diaphragm) method in certain special urban environment conditions, the construction is smoothly completed on the premise of guaranteeing safety, and remarkable social benefits are achieved.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, and more specifically, relates to a method for grouping two linings of large-section tunnels. Background technique [0002] In recent years, with the rapid development of rail transit and underground space construction in major cities in China, builders have gradually improved their mastery and application of underground tunnel construction technology. Common construction methods include full-section method, step method, CD method (in a large-span tunnel with weak surrounding rock, one side of the tunnel is excavated in sections first, and the middle partition is constructed, and then the other side is excavated in sections), CRD method (in a large-span tunnel with weak surrounding rock) In the tunnel, one side of the tunnel is excavated in sections first, the middle partition and the diaphragm are constructed, and then the other side of the tunnel is excavated in parts and the constr...

AI Technical Summary

Problems solved by technology

It is not applicable for bad geology, thin covering soil (less than 7m), heavy traffic on the ground, large dynamic and static loads, and high deformation control standards.

[0005] Therefore, how to be applicable to situations such as poor geology, thin covering soil, heavy ground traffic, large dynamic and static loads, and high deformation control standards has become a technical problem to be solved urgently by those skilled in the art.

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