Advance Support Method for Tunnel Excavation

Abstract

The invention discloses a tunnel excavation advance support method and relates to the technical field of tunnel construction. The object of the present invention is to provide a practical and effective advanced support method with simple technology, strong operability, low cost and practical and effective for excavation construction in tunnel sections with developed groundwater and weak and broken surrounding rocks on the basis of grouting small conduit technology. The technical solution of the present invention is: a tunnel excavation advance support method, comprising the following steps: S1 preparing a small concrete-injected conduit: pouring concrete into the small conduit and vibrating and compacting it to obtain a small concrete-injected conduit; S2 supporting frame support construction: Install and fix the support frame in the tunnel, determine the construction hole position of the small conduit, drill holes in each small conduit construction hole, and the drilling direction is at an acute angle with the direction of the tunnel; Drive in or push in, and be fixedly connected with the support frame. The invention can reinforce the unexcavated rock-soil body, prevent tunnel faces from collapsing, and ensure construction safety.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to an advanced support method suitable for excavation construction of tunnels with developed groundwater and weak and broken surrounding rocks. Background technique [0002] In the excavation construction in the area with developed groundwater and poor surrounding rock, in order to avoid the instability of the tunnel face and the collapse of the tunnel due to the deformation of the surrounding rock, advanced support measures must be taken to ensure construction safety. Existing advanced support methods for tunnel excavation mainly include pipe shed, horizontal rotary grouting pile, small grouting conduit, and advanced anchor rod. Among them, the technology of pipe shed and horizontal jet grouting pile is more complicated and costly. The reinforcement effect of advanced bolts is limited, and it has certain requirements for geological conditions, so it is not suitable for...

AI Technical Summary

Problems solved by technology

Small grouting conduits are widely used, and are generally used in loose and weak surrounding rock caverns. However, there are complex procedures, serious waste of grout caused by poor sealing of gaps, slow construction progress, and relatively developed groundwater or loose rock and soil surrounding rock. Problems such as poor consolidation effect and difficult control of hole section

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