Multi-arch tunnel middle wall steel frame laying method

Abstract

The invention discloses a multi-arch tunnel middle wall steel frame laying method. The multi-arch tunnel middle wall steel frame laying method comprises the following steps of: respectively arrangingindependent steel arch structures in double holes of a multi-arch tunnel; arranging the steel arch structures of a front hole and a rear hole in a staggered manner; pre-burying a lower steel frame, which is close to one side of a shared side wall, of the rear hole into the shared side wall of the front hole in the excavation process of the front hole; and when the rear hole is excavated, fixing the pre-buried lower steel frame with steel frames at other parts of the steel arch structure of the rear hole, so that the complete rear hole steel arch structure is formed. According to the multi-archtunnel middle wall steel frame laying method, by changing the traditional lap joint mode of the steel arch frames of a multi-arch and mid-partition-wall-free tunnel and adopting a staggered laying mode of the steel arches, the mode of concentrated stress generated by lap joint of the traditional steel arches is changed, so that the stress of the tunnel structure is more reasonable, tunnel construction is safer, and safe operation of the tunnel in the later period is guaranteed.

Description

technical field [0001] The invention relates to a method for laying steel frames of walls in a multi-arch tunnel, belonging to the technical field of tunnel support. Background technique [0002] With the rapid growth of my country's economy and the continuous increase of population, the process of basic transportation construction is also accelerating. The main types of highway tunnel construction are separated tunnels and multi-arch tunnels. Multi-arch tunnels can adapt to more terrains, have high space utilization and low construction costs, and can effectively solve bridge-tunnel connections and short tunnels during road construction. Therefore, in the process of expressway construction, the construction of multi-arch tunnels has significant advantages over separate tunnels. [0003] However, the construction method of multi-arch tunnels is more complicated than that of separate tunnels, and its domestic construction level is far behind that of foreign countries. Repea...

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Problems solved by technology

[0003] However, the construction method of multi-arch tunnels is more complicated than that of separate tunnels, and its domestic construction level is far behind that of foreign countries. Repeatedly disconnected, even though the multi-arch tunnel was completed through the efforts of the construction workers, cracks appeared soon after the tunnel was put into operation, making the construction of the multi-arch tunnel always fail to meet the safety requirements

In the actual construction of multi-arch tunnels, the way that the steel arch frame of the rear tunnel is overlapped with the steel arch frame of the preceding tunnel is often used for support, which is equivalent to acting on the steel arch frame of the preceding tunnel in a concentrated force. However, for As far as the tunnel structure is concerned, it is best to act on the structure in the form of uniform force, otherwise it will be extremely detrimental to the stability of the tunnel structure

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