Construction method of shallow-buried large-span tunnels

Abstract

The invention discloses a construction method of shallow-buried large-span tunnels. The method comprises the following steps: (1) building vertical piles on the ground by using the shallow-buried characteristics of the tunnels, putting the pile bottoms in a stable force-keeping layer below the bottoms of the tunnel arches to be built, namely reserving vertical support piles in advance in the peripheries and the lands of the tunnels to be built before carrying out underground excavation construction of the tunnels; (2) carrying out partial excavation during underground excavation construction, and connecting transverse supports of initial bracing structures to the preset vertical support piles; and (3) completing a process of pouring secondary linings under the condition that the initial vertical temporary supports are not removed; and removing the vertical temporary supports in the structures after the secondary linings form the strength and completing structure construction. Through the construction method of the shallow-buried large-span tunnels, the technical problems of the construction safety risk during pouring the secondary linings and the sedimentation control of the poured road surface can be solved.

Description

Technical field [0001] The invention belongs to a construction method of a shallow buried large-span tunnel underneath a road. Background technique [0002] Limited ground resources and traffic efficiency are difficult to meet the needs of rapid traffic at intersections. Using underground tunnels (or pedestrian underpasses) to form an overpass with ground roads is one of the engineering solutions to avoid interference and relieve congestion. [0003] The underpass tunnel (or passage) placed in an urban environment usually has the following characteristics: [0004] ①Shallow buried. Under urban environmental conditions, the ground and underground space resources are limited, and the underpass tunnels are required to be laid in a vertical position as shallow as possible. For the underpass tunnel, the shallower vertical buried depth can shorten the tunnel length under the same slope, which is beneficial to reduce the occupation of ground space by the open climbing section at both ends...

AI Technical Summary

Problems solved by technology

[0021] The purpose of the present invention is to provide a construction method for a shallow-buried large-span tunnel to solve technical problems such as avoiding construction safety risks during the pouring of the second lining and controlling ground settlement of the handed over road.

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