An optimized construction method for multi-arch tunnels

A construction method and technology of multi-arch tunnels, which are applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve the problems of hidden quality of top poured concrete voids, difficulties in installing and dismantling formwork, and slow construction progress, so as to ensure structural stress, The effect of fast speed and reduced process
CN108266191BActive Publication Date: 2019-08-27RANKEN RAILWAY CONSTR GROUP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
RANKEN RAILWAY CONSTR GROUP
Publication Date
2019-08-27

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Abstract

The invention discloses an optimized construction method for a double-arc tunnel. The optimized construction method for the double-arc tunnel comprises the following steps that temporary support is carried out after a middle pilot tunnel is mechanically excavated by a benching tunnelling method; a structural steel arc frame is installed on the side, close to a first cave, of the middle pilot tunnel, construction of a hanging net, connecting bars, anchor rods and sprayed concrete is carried out, and a primary support structure is formed by installing the structural steel arc frame, the hangingnet and sprayed concrete construction; plain concrete is backfilled integrally on the side, close to a back cave, of the middle pilot tunnel; the first cave is mechanically excavated by the benching tunnelling method, and a primary support is closed to form a ring; and a back cave is mechanically excavated by the benching tunnelling method, and the primary support is closed to form a ring. The optimized construction method for the double-arc tunnel can reduce construction processes, improve the construction speed and effectively reduce the construction cost.
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Description

technical field

[0001] The invention relates to the construction field of multi-arch tunnels, in particular to an optimized construction method for multi-arch tunnels. Background technique

[0002] For the construction of two parallel tunnels, when the surrounding terrain is complex, land acquisition and demolition, and line layout are extremely difficult, the structural form of multi-arch tunnels is often adopted. During the construction of multiple arch tunnels, the left and right main tunnels can be excavated and supported only after the construction of the middle partition wall in the middle pilot tunnel is completed. According to the terrain conditions at the entrance and exit of the tunnel and the actual situation of the construction site, the excavation of the intermediate pilot tunnel can be carried out simultaneously from both ends of the tunnel and penetrate in the middle of the tunnel, or it can be excavated from one end of the tunnel and penetrate at the other en...

Claims

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