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Excavation supporting method for tunnel construction

A tunnel construction and tunneling technology, which is applied in the field of ancient rock pile geological V, basalt geological tunnel excavation and support, and VI level surrounding rock tunnel field, to achieve the effect of shortening construction time, fast forming and reducing construction cost.

Inactive Publication Date: 2010-07-07
HOHHOT RAILWAY CONSTR OF THE SIXTH ENG BUREAU CREC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide an excavation and support method for tunnel construction under adverse geological conditions. Steel frame support excavation method”

Method used

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  • Excavation supporting method for tunnel construction
  • Excavation supporting method for tunnel construction
  • Excavation supporting method for tunnel construction

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Embodiment Construction

[0009] Step 1: Excavation and support for the upper steps 1. Constructing ① part of the advanced small conduit; 2① part of circular mechanical excavation and manual trimming; ① part of the tunnel surface sprayed concrete to seal; Net; 5① install initial supporting steel frame, install ① system anchor rod and lock foot anchor pipe; 6① spray initial support; 7 excavate ① part core soil, temporary vertical steel frame support;

[0010] Step 2: Excavation and support of middle steps 1②, ③ parts mechanically staggered excavation, manual trimming; 2② parts, ③ parts are sprayed with concrete to seal; 3② parts, ③ parts are initially sprayed with 4cm thick concrete; 4② parts, ③ parts Hang reinforcement mesh at the part; 5② and ③ install initial support steel frame, install ② and ③ system anchor rod and lock foot anchor pipe; 6② and ③ spray initial support; 7 excavate ② and ③ The core soil between the ③ parts is supported by the vertical steel frame of the temporary middle step; 8 conne...

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Abstract

The invention discloses an excavation supporting method for tunnel construction. In the method, the tunnel is excavated in parts and blocks, arch part primary support and temporary steel frame support are erected to form reticular closed stable support system, and finally a complete tunnel section is formed, the excavation and support of each part are in vertical staggered manner along tunnel and are carried on through parallel advancing construction method. The excavation supporting method has large excavation part section, facilitates the operation of construction machinery, has simple primary-support process, easy operation, reduces the arch jack fabrication, anchor rod mounting and concrete spraying processes for middle partition and temporary inverted arch construction, reduces the construction period and the construction cost.

Description

technical field [0001] The invention relates to an excavation and support method for tunnel construction, in particular to an excavation and support method suitable for ancient rock pile geological grade V and VI surrounding rock tunnels and basalt geological tunnels. Background technique [0002] There are a large number of mountains on the surface of the earth, especially in the west of my country, which are mainly mountainous. Due to the effects of wind erosion, rain, earthquakes, etc., the mountain collapsed and formed a large number of rock pile geological sections. For railway and highway projects, due to the requirements of speed and line type, it is inevitable to pass through these geological sections of rock piles in the form of tunnels. The ancient rock pile has extremely poor geological self-stabilization ability, poor cohesion, uneven settlement, and belongs to unstable rock mass. Under such geological conditions, during the tunnel construction process, the str...

Claims

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Application Information

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IPC IPC(8): E21D9/01E21D11/12E21D11/10E21D20/00
Inventor 王化平程文亮刘平金李志勇秦建晟安渊王春立
Owner HOHHOT RAILWAY CONSTR OF THE SIXTH ENG BUREAU CREC
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