Integrated excavation construction method for transition from shaft construction passage to large cross-section tunnel

Abstract

The invention discloses an integrated excavation construction method for transition from a shaft construction passage to a large cross-section tunnel. The method is characterized in that mileages of ashaft, a cross passage and an internal cross passage of a double-sidewall cross passage need to be larger than 3 times of a cross passage hole width, so that mutual interference between shaft and cross passage construction and internal cross passage construction can be avoided; transition construction for the cross passage and a subway station tunnel is carried out at a same elevation, so that abias pressure on a joint section caused by variable cross-section construction for the large cross-section tunnel and a small cross-section tunnel can be avoided; and the internal cross passage is established and a frame girder is erected during excavation of the large cross-section tunnel through the double-sidewall drift method, so that the transition construction is achieved. The method provided by the invention has the advantages that the benching tunneling method for the construction passage and the 9-step double-sidewall drift method for the subway station tunnel are integrated, so thata transition section process of the two construction methods is simplified, and the construction is facilitated.

Description

technical field [0001] The invention belongs to the technical field of large-section tunnel construction, and relates to an integrated excavation construction method for converting a vertical shaft construction channel into a large-section tunnel, in particular to a method of rock pillars in a double hole—a method of excavating in a double-side pilot pit The integrated excavation construction method of the shaft-construction channel conversion large-section tunnel improved on the basis of this paper. Background technique [0002] With the rapid development of society and the acceleration of urbanization, the scale of cities is constantly expanding, and the population of large cities and megacities is dense, and the traffic for people to travel has become extremely congested. In order to meet people's travel requirements and realize the purpose of convenient and fast transportation, people gradually turn their attention to the construction of urban rail transit. Among them, ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problem of uneven force and bias pressure on the surrounding rock and support in the conversion section of the subway station tunnel in the construction channel conversion, and to overcome the existing construction scheme by using the construction channel to transfer to the subway station tunnel to complete the overall opening of the station. Disadvantages of long mining cycle

[0008] 2) Use the double-side-wall pilot pit method to excavate large-section tunnels to open up internal cross passages, improve the traditional middle partition support, and erect frame beams instead to ensure the safe construction of internal cross passages, which is convenient for slag and slag discharge between the left and right pilot tunnels. The construction of support and Fengshui circuit further solves the safety problem of opening a cross passage inside the double side wall pilot pit method and the slow construction period of excavating the subway station

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