Soft rock tunnel construction method

A technology of tunnel construction and construction method, applied in the field of machinery, can solve problems such as inability to adapt to the construction of soft rock tunnels

Active Publication Date: 2013-11-27
GEZHOUBA XINJIANG ENG +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, once the soft rock tunnel chamber is excavated, the side roof sand and stones will collapse immediately. In the area where the lens of the sand layer is distributed, the collapse is serious. Support methods such as pre-grouting, random bolts and steel mesh are no longer suitable for the construction of soft rock tunnels
However, many key technical issues in the construction of soft rock tunnels currently have no rules and regulations for reference, and can only be continuously explored during construction.

Method used

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Experimental program
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Embodiment Construction

[0017] Such as figure 1 As shown, the first step: a support construction

[0018] 1. Cavern excavation

[0019] The construction is carried out by two-step step-by-step parallel excavation method. Excavate the upper pilot tunnel first, and manually excavate to the design line with pneumatic picks and shovels in the first area of ​​the upper pilot tunnel. Small excavators (0.2m 3 ) with ballasting. Immediately after the excavation of the upper pilot tunnel is completed, the reinforcement arch, mesh and connecting bars shall be installed, and C25 concrete shall be sprayed to the design line of the first lining. Then use a small excavator (0.2m 3 ) to excavate the core soil platform (area II, about 3m long) and area III. Simultaneously carry out the excavation of area IV (area V) of the side wall, that is, use a small excavator to directly excavate and load the ballast, and transport it with 3 to 5 5T dump trucks. , Immediately after the completion of the excavation, instal...

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Abstract

The invention provides a soft rock tunnel construction method. The soft rock tunnel construction method comprises the following steps of: densely arranging grid arch frames in a tunnel, mounting and fixing the grid arch frames, hanging nets, mounting steel arch frames and net sheets, and then checking and accepting the steel arch frames and the net sheets; then, coating top arches and side walls, operating a steel mould trolley and pouring concrete into the side walls; pouring the concrete into top arches; and maintaining. By adopting the soft rock tunnel construction method, the construction efficiency of the soft rock tunnel is improved, the construction safety is ensured and the construction cost is lowered.

Description

technical field [0001] The invention relates to a soft rock tunnel construction method, which belongs to the technical field of machinery. Background technique [0002] At present, most of the water conservancy project tunnels in my country are built in hard or relatively hard rock mass. Due to the high strength of the rock mass, the self-stabilization ability of the surrounding rock after excavation is strong. Generally, there will be no safety problems during the construction period. However, once the soft rock tunnel chamber is excavated, the side roof sand and stones will collapse immediately. In the area where the lens of the sand layer is distributed, the collapse is serious. Support methods such as pre-grouting, random bolts and steel mesh are no longer suitable for the construction of soft rock tunnels. However, many key technical issues in the construction of soft rock tunnels currently have no rules and regulations for reference, and can only be continuously explo...

Claims

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Application Information

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IPC IPC(8): E21D11/00E21D11/14E21D11/10
Inventor 龙小明林训钢李志强王会勤蒋韬
Owner GEZHOUBA XINJIANG ENG
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