Construction method of opening for allowing highway tunnel parallel pilot tunnel to enter cross passage

Abstract

The invention belongs to the technical field of tunnel construction, and provides a construction method of an opening for allowing a highway tunnel parallel pilot tunnel to enter a cross passage in order to solve the technical problems that in traditional construction of the opening for allowing the parallel pilot to enter the cross passage, the construction cost is high, the construction cycle is long, and strong construction interference and large construction safety risk exist. Central lines of primary support structures arranged in front of and at back of the intersecting position of the central line of the parallel pilot tunnel and the central line of the cross passage offset in the direction of the cross passage, the radius of an upper step steel arch support is increased according to a designed contour, and the radius of a lower step steel arch support still is the radius adopted in original construction; on the basis of the cross passage steel supports with the normal contour, angle changing treatment is conducted on all arch support units of the steel supports, and grouting locking anchor pipes are distributed on connecting plate joints and arch crowns of the units respectively. According to the construction method, the structure is simple, design is reasonable, machining is easy and convenient, the primary support stress structures at the intersections are improved, primary support stability is guaranteed, the construction technology is simple, operation is easy, and the primary support construction quality of the intersections is conveniently controlled.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a construction method for the opening of a parallel pilot tunnel in a highway tunnel. Background technique [0002] At present, considering the construction and post-operation emergency rescue conditions of super-long tunnels of secondary highways, a small cross-section parallel pilot tunnel is generally set up on one side of the main tunnel, and a 90° transverse passage is used to connect the two. During construction, in order to make full use of the advance forecasting, drainage and emergency rescue operations of the parallel pilot tunnel, it is necessary to excavate from the parallel pilot tunnel to enter the transverse channel. Due to the limit size of the cross passage building, when the pilot tunnel enters the cross passage, the vault profile of the pilot tunnel and the cross passage vault are basically at the same elevation, resulting in the initial...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problems of high construction cost, long construction period, large construction interference and high construction safety risks in the opening construction of the traditional parallel pilot tunnel, the present invention provides a construction method for the opening of the parallel pilot tunnel horizontal tunnel in highway tunnels. method

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