Full-section construction structure and construction method of large-section soft ground tunnel

Abstract

The invention discloses a full-section construction structure and construction method of a large-section weak stratum tunnel. An anchoring system, each tunnel excavation and anchoring mechanism includes an anchor rod, an anchoring mechanism and a rotary digging tool; the method includes steps: 1. construction of the rear end segment; 2. construction of the next tunnel segment; 3. one-time Or repeat step two several times until the tunnel construction process is completed. The invention is reasonable in design, simple in construction, good in use effect, and easy to control in construction quality. The tunnel excavation and anchorage system is composed of multiple tunnel excavation and anchorage mechanisms to effectively and dynamically anchor the rock mass in front of the tunnel face. Mechanized full-section excavation of tunnels with weak cross-sections ensures the stability of the tunnel surrounding rock and tunnel structure, reduces construction risks, and can effectively speed up the construction progress and the tunnel construction quality is easy to control.

Description

Technical field [0001] The present invention belongs to the technical field of tunnel construction, particularly to the structure and construction of the whole construction method weak stratum large section tunnel section. Background technique [0002] In recent years, under construction and planned railway tunnels, road tunnels, subway and other underground works, through the soft ground tunneling works more and more, through the soft surrounding rock formations of soft rock tunnel (also known as soft surrounding rock tunnel) high proportion, and through the formation of loess tunnel project is greater, the tunnel section is also growing. The probability of soft rock (ie weak surrounding rock) plastic deformation is very high, often resulting in reduced clearance tunnels, construction and affecting the normal use of the tunnel. Due to the nature of the geological weak surrounding rock itself loose structure and poor stability, which determines that it would have a certain degree...

AI Technical Summary

Problems solved by technology

This type of method has the following three common defects: the first, the excavation section has many divisions (also known as many blocks), and the process is complicated; the second, each part of the excavation section is small, and the degree of mechanization is low; The ring protection period is long and the deformation is large

However, the manufacturing cost of large-section shield machines is relatively high, and the equipment is not very versatile, resulting in high engineering costs. In addition, large-section shield segment tunnels sometimes need to add secondary linings in consideration of the seismic performance of the structure. At this time, it is very uneconomical to adopt the shield tunneling method for construction.

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