Method for constructing double-arch tunnel by rebuilding and expanding existing single-hole tunnel

Abstract

The invention relates to a method for constructing a double-arch tunnel by rebuilding and expanding an existing single-hole tunnel. The technical problem to be solved by the invention is to provide a method for constructing the double-arch tunnel by rebuilding and expanding the existing single-hole tunnel, which adopts a ' middle pilot hole, the existing tunnel and a right hole' three pilot pit construction scheme, enlarges construction face and reduce excavation face and surrounding rock disturbed zone. To solve the technical problem, the invention adopts a technical scheme that the method for constructing the double-arch tunnel by rebuilding and expanding the existing single-hole tunnel comprises the following steps: 1.1 constructing the middle pilot hole parallel to the existing single-hole tunnel on one side of the existing single-hole tunnel and completing supporting construction; 1.2, constructing a left hole by sequence and zone on the basis of the existing single-hole tunnel and communicating the left hole and the middle pilot hole; and 1.3, after excavating the left hole to a certain size, constructing the right hole by sequence and zone and communicating the right hole with the middle pilot hole. The method is mainly used in highway traffic engineering and municipal traffic engineering.

Description

technical field [0001] The invention relates to a construction method for rebuilding and expanding an existing single-hole tunnel into a multi-arch tunnel. It is mainly applicable to highway traffic engineering and municipal traffic engineering. Background technique [0002] With the rapid development of our country's national economy, the traffic volume is increasing day by day, and some existing roads can no longer meet the requirements of transportation, and need to be rebuilt and expanded to achieve the corresponding service level. In economically developed areas, these problems have become increasingly prominent, such as the reconstruction and expansion of Shenyang-Dalian Expressway and Shanghai-Hangzhou Expressway. With the continuous development of highways and municipal infrastructure, the tunnel project has been developed rapidly. The tunnel has developed from a single tunnel for two-way driving to a double tunnel for uplink and downlink separation. Regardless of ...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a construction method for rebuilding and expanding an existing single-hole tunnel into a double-arch tunnel in view of the problems existing in the reconstruction and expansion of existing tunnels. The construction plan of the pilot pit increases the construction surface to achieve the purpose of reducing the excavation surface and disturbing the surrounding rock range, and improving the construction safety

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