Long-span arch tunnel partly bright and partly dark construction method

Abstract

The present invention relates to a long-span arch tunnel partly bright and partly dark construction method. The method comprises the steps of: according to construction, performing field layout survey; performing pilot tunnel in the process of construction, pouring a middle wall after the pilot tunnel is cut through; arranging a dark hole section lead pipe shed; arranging mini pile grouting reinforcement soil bodies at two sides of the tunnel; constructing a partly bright and partly dark section vault and cover arch cover plate; employing a benching tunneling construction method to construct left and right holes of the tunnel, and constructing temporary inverted arches of the left and right holes; dismounting the temporary inverted arches of the left and right holes, and constructing archwall secondary lining for the left and right holes; constructing a tunnel accessory structure, and completing the construction. The long-span arch tunnel partly bright and partly dark construction method is a construction method suitable for an extreme condition with a relatively high road grades, without a road change condition and that an undermining method cannot be employed for construction. The long-span arch tunnel partly bright and partly dark construction method overcomes the limitation of the traditional construction method, avoid large engineering risk and ensure the normal pass of the roads during the tunnel construction.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a half-light and half-dark construction method for a long-span multi-arch tunnel. Background technique [0002] With the advancement of urbanization in my country, the above-ground space resources are becoming more and more scarce, and the development of road systems has gradually changed from above-ground to underground, and a large number of municipal tunnel projects have emerged. The construction of municipal tunnels will inevitably encounter the situation of passing through existing roads, and the contradiction between ensuring the normal passage of existing roads and reducing project risks is becoming more and more prominent. Generally speaking, when the grade of the road is not high, it is possible to reduce the project risk by guiding the road during the construction period, and then adopt the open cut method for construction; Excavation construction, often du...

AI Technical Summary

Problems solved by technology

Generally speaking, when the grade of the road is not high, it is possible to reduce the project risk by guiding the road during the construction period, and then adopt the open cut method for construction; Excavation construction, often due to shallow burial, has a relatively high construction risk; when encountering extreme construction conditions where neither the road can be changed nor the underground excavation method can be used, a lot of manpower and material resources will be used to solve the problem, which often leads to serious problems. Large-scale project risks, construction period risks and even adverse social impacts

Images