A method for laying steel frames in the middle wall of multi-arch tunnels

Abstract

The invention discloses a method for laying steel frames in the middle wall of a multi-arch tunnel. Independent steel arch structures are arranged in the double holes of the multi-arch tunnel, and the steel arch structures of the leading hole and the rear hole are staggered. In the process, the lower steel frame on the side close to the common side wall of the rear tunnel is pre-embedded in the common side wall of the first tunnel, and when the rear tunnel is excavated, the pre-embedded lower steel frame and other parts of the rear tunnel steel arch The steel frame is fixed to form a complete steel arch structure of the rear tunnel. This method changes the traditional overlapping method of the steel arch frame of the tunnel with multiple arches and no middle partition wall, and uses the misplaced layout of the steel arch frame to change the form of concentrated stress generated by the lap joint of the traditional steel arch frame, so that the force of the tunnel structure is more reasonable. , making the tunnel construction safer and ensuring the safe operation of the tunnel later.

Description

technical field [0001] The invention relates to a method for laying a steel frame of a middle wall of a multi-arch tunnel, and belongs 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 infrastructure transportation construction is also accelerating. The main types of highway tunnels are split tunnels and multi-arch tunnels. Multi-arch tunnels can adapt to more terrains, have high space utilization, low construction costs, and can effectively solve bridge-tunnel connections and short tunnels in the process of highway construction. Therefore, in the process of expressway construction, the construction of multi-arch tunnels has significant advantages over split tunnels. [0003] However, the construction method of the multi-arch tunnel is more complicated than that of the split tunnel, and its construction level in China is far from that of foreign coun...

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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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