A kind of tunnel excavation support construction method

Abstract

The invention relates to a tunnel excavation and supporting construction method. The tunnel excavation and supporting construction method comprises the steps of (1) construction of a tube shed at a hole opening, (2) advance supporting construction, (3) excavation of a first in-hole soil layer, (4) laying of a steel arch, (5) construction of a primary lining anchor rod and a primary lining concretelayer, (6) excavation of a second in-hole soil layer, (7) construction of a middle partition wall, (8) excavation of a third in-hole soil layer and a fourth in-hole soil layer, and (9) construction of an inverted arch at the bottom of a hole. The tunnel excavation and supporting construction method has the beneficial effects that a unit assembling support is used for erecting a tube shed formworkand laying the steel arch, so that the erecting and disassembling construction efficiency of a supporting structure is greatly improved, and the cost of engineering measures is saved. According to the tunnel excavation and supporting construction method, a formwork internal support is arranged between a tube shed inner formwork and an tube shed outer formwork, a wall thickness control body is arranged on the outer side of a wall formwork, so that the construction quality of concrete pouring is effectively improved, and the use amount of materials is saved.

Description

Technical field [0001] The invention relates to a tunnel engineering construction method, in particular to a tunnel excavation and support construction method with poor surrounding rock self-stability and large tunnel width, belonging to the field of civil engineering, and suitable for tunnel excavation and support construction projects in soft rock and soil. Background technique [0002] In the construction process of super-large section tunnels with weak surrounding rock, the traditional excavation methods are double-side piloting method, CD method, CRD method, etc. For tunnels with super-large section and poor surrounding rock, double-side piloting method, CRD method It has good adaptability, but due to more temporary supports and slow on-site construction, it is often difficult to ensure the stability of the maintenance structure and the construction cost is high. [0003] In the prior art, there is a super-large section tunnel excavation support structure and operation method ...

AI Technical Summary

Problems solved by technology

This method has a large number of excavation work areas, and it is difficult to effectively improve the construction efficiency on site.

[0004] In summary, although the existing construction has achieved good construction results under suitable working conditions, there are still deficiencies in improving site construction efficiency, saving support structure materials, and protecting the ecological environment.

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