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Tunnel advance pre-supporting technology used in discrete gravelly soil and broken surrounding rock

A technology for crushing surrounding rock and gravel soil, which is applied in tunnels, tunnel linings, earthwork drilling and mining, etc. It can solve the problems of small lead pipe angle, large tunnel overexcavation, and small grouting range, etc., to reduce the amount of grout , Improving structural safety performance and saving engineering investment

Inactive Publication Date: 2015-04-22
POWERCHINA CHENGDU ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are the following disadvantages in the existing advanced small conduits: 1. The angle of the existing small advanced conduits is too small, and construction cannot be carried out on site; Advance Grouting Small Conduit as a Temporary Supporting Measure
Therefore, there is no one in the prior art that can effectively improve the operability of construction, reduce the over-excavation of the tunnel, increase the scope of tunnel reinforcement, improve the safety of construction, improve the structural safety performance of the tunnel and the durability of the tunnel. Advanced pre-support technology for tunnels in loose gravel soil and broken surrounding rock that reduces the amount of grout in radial grouting and saves engineering investment

Method used

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  • Tunnel advance pre-supporting technology used in discrete gravelly soil and broken surrounding rock

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specific Embodiment

[0025] Specific embodiment: Before the excavation of tunnels with surrounding rocks of grades V to VI, the length of the steel frame 3 is laid in advance along the tunnel excavation contour to a certain range of the rock and soil body 4 outside the tunnel excavation contour line according to the requirements of the design parameters. It is a 300cm to 450cm advance grouting small conduit, and then according to the requirements, the pre-reinforced loose broken rock and soil mass is pre-reinforced through the small conduit and then excavated. After the excavation, the steel support can be constructed in time. Grid steel frame 3, longitudinal connecting bars, steel mesh, sprayed concrete and initial support of radial system. Carry out advanced pre-support for the tunnel first, and then excavate. After the excavation, carry out the initial support in time. The excavation cycle is followed by the initial support. After the excavation and the initial support are completed, the seconda...

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Abstract

The invention relates to a tunnel advance pre-supporting technology used in discrete gravelly soil and broken surrounding rock. Particularly, the tunnel advance pre-supporting technology used in the discrete gravelly soil and the broken surrounding rock is applied to the tunnel construction field. The tunnel advance pre-supporting technology used in the discrete gravelly soil and the broken surrounding rock can reduce tunnel over excavation amount, improves construction safety assurance, improves safety performance and durability of a tunnel, reduces radial grouting amount, and saves engineering investment. The tunnel advance pre-supporting technology used in the discrete gravelly soil and the broken surrounding rock includes following steps: a, driving small grouting ducts into the tunnel along the outer periphery of an excavation contour line of the tunnel; b, pouring grout into the discrete gravelly soil and the broken surrounding rock through the small grouting ducts, wherein a grouting amount limiting method is used to pour the grout into the discrete gravelly soil and the broken surrounding rock. The tunnel advance pre-supporting technology used in the discrete gravelly soil and the broken surrounding rock improves maneuverability of construction, reduces the tunnel over excavation amount, enlarges a tunnel reinforce range, improves the safety assurance of the construction, and improves the safety performance and the durability of the tunnel.

Description

technical field [0001] The invention relates to a tunnel advance pre-support technology in loose gravel soil and broken surrounding rock, in particular to an advanced tunnel pre-support technology in loose gravel soil and broken surrounding rock applied in the field of tunnel construction . Background technique [0002] Divided according to surrounding rocks: weak and broken surrounding rocks and loose gravel soil belong to grade Ⅴ~Ⅵ surrounding rocks. The support method of the existing V-VI surrounding rock tunnels is to construct advanced pre-support such as advanced small conduits or advanced large pipe sheds, and then use appropriate excavation methods to excavate the part that should be excavated in the tunnel, and then Install the initial support of the steel frame mesh spraying along the tunnel excavation contour surface, and construct the support work of the cement mortar anchor for the initial support of the tunnel, and finally complete the laying of the tunnel wat...

Claims

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Application Information

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IPC IPC(8): E21D11/10
CPCE21D11/10
Inventor 吴学智
Owner POWERCHINA CHENGDU ENG
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