Construction method for soft surrounding rock section at tunnel portal passing through fine sand layer

A technology with weak surrounding rocks and construction methods, applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve problems such as tunnel entry difficulties in sand layers, achieve the effects of controlling sand layer hazards, ensuring construction safety, and reducing disturbances

Pending Publication Date: 2018-06-29
THE FIRST ENG OF CCCC FOURTH HARBOR ENG +1
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a construction method for the weak surrounding rock section of the tunnel opening through the fine sand layer, which can well solve the problem of difficult tunnel entry in the sand layer section when the tunnel entrance encounters a sand layer

Method used

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  • Construction method for soft surrounding rock section at tunnel portal passing through fine sand layer
  • Construction method for soft surrounding rock section at tunnel portal passing through fine sand layer
  • Construction method for soft surrounding rock section at tunnel portal passing through fine sand layer

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Embodiment Construction

[0028] like figure 1 Shown, the construction sequence of the present invention:

[0029] The present invention includes 6 working faces, and the construction sequence of each working face is detailed in figure 1 , where, firstly, the high-pressure jet grouting pile 1 is applied outside the tunnel, and then excavated according to the order of the top arc-shaped pilot pit 2, the middle steps on the left and right sides 3, the lower steps on the left and right sides 4, the reserved core soil 5, and the tunnel bottom 6 , the operation method of each division is as follows:

[0030] (1) if figure 2 As shown, the high-pressure rotary grouting piles 1 outside the tunnel are constructed: several vertical high-pressure rotary grouting piles 1 are constructed above the tunnel entrance, and the high-pressure rotary grouting piles 1 penetrate from top to bottom to within the tunnel excavation contour. Preferably, the vertical high-pressure jet grouting piles 1 outside the hole adopt a...

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Abstract

The invention discloses a construction method for a soft surrounding rock section at a tunnel portal passing through a fine sand layer. The construction method comprises the following steps that vertical high-pressure rotary jet grouting piles outside the tunnel are constructed; a top curved pilot tunnel of the tunnel section is excavated, and primary support is constructed in time after the excavation is completed; then left and right side middle steps are excavated, and the primary support is constructed in time after the excavation is completed; then left and right side lower steps are excavated, and the primary support is constructed in time after the excavation is completed; then reserved core soil of the upper, middle and lower steps is excavated; and finally, the bottom of the tunnel is excavated, an inverted arch steel frame is installed in time, and C25 concrete is sprayed, so that the primary support of the whole tunnel forms a closed loop as soon as possible. According to the entering-tunnel fine sand layer-passing construction method using an outside tunnel surface high-pressure jet grouting reinforcement undercutting method, sand bed hazards and vault sinking can be controlled effectively, and the construction method is suitable for entering-tunnel excavation construction of the tunnel portal passing through the sand section.

Description

technical field [0001] The invention relates to the field of tunnel construction, in particular to the technical field of construction where a tunnel opening passes through a fine sand layer. Background technique [0002] Tunnel entrance construction is a difficult point in tunnel construction, especially for large-section tunnels. The larger the tunnel section, the more difficult the construction of the entrance. In addition, most tunnels have the characteristics of weak surrounding rock, complex geology, shallow burial, and bias pressure. The construction of the entrance is even more difficult. difficulty. [0003] The sand layer is more harmful to the tunnel construction, especially when the sand layer is encountered at the entrance of the tunnel. If it is not handled properly, it will easily cause the tunnel vault to be hollowed out or even collapsed, causing great harm to the tunnel construction. [0004] The publication number is CN102071947B, and the Chinese inventio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/04E21D9/00E21D11/18E21D11/10
CPCE21D9/04E21D9/001E21D11/10E21D11/18
Inventor 卢玉荣荣劲松王哲蒋正舜曹旭刚唐兆席欧柳和黄国忠林治平
Owner THE FIRST ENG OF CCCC FOURTH HARBOR ENG
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