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Optimized construction method for double-arc tunnel

A construction method and technology for multi-arch tunnels, which are applied to tunnels, tunnel linings, and earth-moving drilling and mining, etc., can solve problems such as hidden quality problems of top poured concrete voids, difficulty in installing and removing formwork, slow construction progress, etc. The effect of fast speed and reduced process

Active Publication Date: 2018-07-10
RANKEN RAILWAY CONSTR GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] 1. There are many processes and the construction progress is slow;
[0015] 2. At the top of the partition wall, it is difficult to install and remove the formwork, and there are hidden dangers in the quality of the cavity poured into the top;
[0016] 3. Concrete is molded with shaped formwork, which is costly

Method used

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  • Optimized construction method for double-arc tunnel
  • Optimized construction method for double-arc tunnel
  • Optimized construction method for double-arc tunnel

Examples

Experimental program
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Effect test

Embodiment 1

[0058] Such as Figure 1-5 Shown, a kind of multi-arch tunnel optimization construction method of the present invention comprises the following steps:

[0059] (1) Temporary support after the pilot tunnel 1 in mechanical excavation by step method;

[0060] (2) Install a profiled steel arch frame on the side of the middle pilot tunnel 1 near the first hole 2, and then carry out the construction of hanging nets, connecting bars, anchor rods and sprayed concrete, and form the primary support structure by installing profiled steel arch frames, hanging nets and sprayed concrete construction 4;

[0061] (3) Plain concrete 5 is integrally backfilled on the side of the middle pilot tunnel 1 near the rear tunnel 3;

[0062] (4) The first hole 1 is mechanically excavated by the step method, and the initial support is closed to form a ring;

[0063] (5) The rear tunnel 3 is mechanically excavated by the step method, and the initial support is closed to form a ring.

[0064] Wherein, ...

Embodiment 2

[0071] Such as Figure 1-5 Shown, a kind of multi-arch tunnel optimization construction method of the present invention comprises the following steps:

[0072] (1) Temporary support after the pilot tunnel 1 in mechanical excavation by step method;

[0073] (2) Install a profiled steel arch frame on the side of the middle pilot tunnel 1 near the first hole 2, and then carry out the construction of hanging nets, connecting bars, anchor rods and sprayed concrete, and form the primary support structure by installing profiled steel arch frames, hanging nets and sprayed concrete construction 4;

[0074] (3) Plain concrete 5 is integrally backfilled on the side of the middle pilot tunnel 1 near the rear tunnel 3;

[0075] (4) The first hole 1 is mechanically excavated by the step method, and the initial support is closed to form a ring;

[0076] (5) The rear tunnel 3 is mechanically excavated by the step method, and the initial support is closed to form a ring.

[0077] Wherein, ...

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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.

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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Application Information

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IPC IPC(8): E21D9/00E21D11/10E21D11/18E21D20/00
Inventor 凌晓东张东韩义兵张星王衍刚羊东贺超邹海波徐双龙刘威唐胜蒲华东
Owner RANKEN RAILWAY CONSTR GROUP
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