Construction method for subway tunnel with good supporting effect

Abstract

The invention discloses a construction method for a subway tunnel with a good supporting effect. The construction method comprises the following steps: 1) determining an engineering construction scheme and a support scheme according to the results of geological survey and environment survey; 2) downward excavating from the ground level of the construction position till reaching a preset excavating depth; 3) leveling the excavated surface and pre-supporting the leveled inner surface of the tunnel, wherein the pre-supporting operation includes the step of uniformly striking a plurality of steel pipes with fixing sheets at the tail into the excavated inner surface of the tunnel, the fixing sheets are arranged on the exterior of the inner surface of the tunnel and a plurality of through holes are formed on the steel pipes; 4) pressure-pouring chemical grout into the steel pipes and reinforcing the ground layer; and 5) injecting concrete onto the inner surface of the subway tunnel and drilling the grout holes on the lower end face in the tunnel. The construction method disclosed by the invention has the advantages that the defects of the prior art are overcome and the structure design is reasonable and novel.

Description

technical field [0001] The invention relates to a construction method for a subway tunnel with good supporting effect, belonging to the field of civil engineering. Background technique [0002] The cover-and-excavation method is a tunnel construction method. It is a new engineering construction method that needs to pass through roads, buildings and other obstacles when the underground project is open. After the ground is excavated to a certain depth, the top is closed, and the rest The substructure is constructed under a closed roof. The main structure can be done forward or reversed. That is to say, in the cover-excavation method, after the ground is excavated to a certain depth, the top is closed, and the rest of the substructure is constructed under the closed top cover. The main structure can be done forward or reversed. When subway stations are built in busy urban areas, roads are often occupied and traffic is affected. When subway stations are located on main roads,...

AI Technical Summary

Problems solved by technology

The disadvantage of the cover-excavation method is that the pressure brought by the upper part of the closure is relatively high, which makes the support easy to settle and affects the construction of the tunnel.