Urban overlapped tunnel excavating construction method under shallow-buried condition

Abstract

The invention discloses an urban overlapped tunnel excavating construction method under a shallow-buried condition, and relates to the technical field of tunnel construction methods. Excavating of an upper layer main tunnel is constructed by adopting a CRD method, the left side and the right side of the upper layer main tunnel are sequentially divided into at least two pilot tunnels from top to bottom, excavating is sequentially conducted from top to bottom at each side, and essential primary bracing and temporary bracing are conducted; the left side and the right side of the upper layer main tunnel are constructed one after another, excavating for the upper pilot tunnel of each side is conducted by adopting modes of hole drilling machine horizontal drilling and core-taking and quartering hammer crushing, and excavating for the rest of the pilot tunnels is conducted in a static blasting mode; the upper layer main tunnel is excavated first, and then a lower layer tunnel is excavated, and excavating for the lower layer tunnel is conducted by adopting modes of mechanical cutting and quartering hammer crushing. The urban overlapped tunnel excavating construction method under the shallow-buried condition is applicable to the shallow-buried tunnels without disadvantageous geology conditions (faults, crushed zones and the like) with the buried depth being not less than 5 meters and the area of the excavated section being not greater than 150 square meters, the requirement for surrounding environment is high, vibration-free protective construction is required, and the construction process is fast.

Description

technical field [0001] The invention relates to a tunnel construction method, in particular to an excavation construction method for superimposed tunnels under the condition of shallow urban burial. Background technique [0002] At present, in the construction of highway tunnels, affected by the overall urban planning and operating routes, it is inevitable to pass under dense ground buildings (structures). It is not only necessary to ensure the safety of the tunnel project itself, but also to properly solve the Impact on nearby existing buildings. [0003] The superimposed form of building road tunnels and power tunnels under the condition of shallow urban burial is still the first. The road tunnel is the upper main tunnel, and the power tunnel is the lower tunnel. The power tunnel is located directly below the road tunnel. Due to the dense and old surface structures on the upper part of the superimposed tunnel, it is required during the construction process: no disturbance...

AI Technical Summary

Problems solved by technology

[0003] The superimposed form of building road tunnels and power tunnels under the condition of shallow urban burial is currently the first

Images