Method for constructing upper step middle partition wall of shallow-buried excavation tunnel

Abstract

The invention discloses a method for constructing an upper step middle partition wall of a shallow-buried excavation tunnel. The method includes the steps of advanced geology forecast, measuring and setting-out, upper step arch advanced supporting, upper step excavation with core soil reserved, upper step application primary supporting, lower step excavation with core soil reserved, upper step middle partition wall detachment, tunnel bottom excavation, temporary inverted arch detachment, inverted arch and inverted arch concrete filling, and arch wall secondary lining construction. The method simplifies construction procedures, saves temporary supporting materials, accelerates the construction progress to 45-60 meters per month, reduces labor cost, effectively shortens the construction period, reduces engineering cost, solves various problems that the number of auxiliary procedures of shallow-buried excavation tunnel construction is large, construction process is slow and structure stress is complicate, reduces influences on surrounding environments, and achieves good social and economic benefits.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a construction method for a partition wall in an upper step of a shallow-buried tunnel. Background technique [0002] The CRD method and the double-side-wall pilot-pit method are often used in the construction of shallow-buried tunnels with weak surrounding rocks. These methods are based on the idea of ​​block excavation, and the excavation and temporary support are removed to disturb the surrounding rock many times. The process transformation is complicated and the operation Small space is not conducive to the use of large mechanical equipment, slow construction progress, long construction period, high cost, poor excavation stability and safety, and is not suitable for low rock strength, developed rock mass structural planes, rock mass endowment The excavation of the two-lane tunnel cannot be carried out due to rock formations with poor storage environmen...

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Problems solved by technology

[0004] The purpose of the embodiments of the present invention is to provide a construction method for the partition wall in the upper step of a shallow-buried tunnel, which aims to solve the problem that the traditional shallow-buried tunnel construction method with weak surrounding rocks cannot excavate a two-lane tunnel and has complicated procedures. The problem of small operating space

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