Initial supporting structure and construction method of frozen tunnel in weak surrounding rock

Abstract

The initial support structure and construction method of tunnel freezing in weak surrounding rocks belong to the technical field of tunnel support structures. The upper and lower flanges of the arch frame are coated with insulating layers inside; the refrigeration device is composed of N-type semiconductors, P-type semiconductors and metal gaskets. The metal gaskets are pasted on the arch at random, and N-type semiconductors and P-type semiconductors are alternately welded at the intersection positions of the metal gaskets to form a galvanic pair; the heat dissipation device is composed of a connecting pipe, a radiator, a ventilation pipe and an exhaust pipe. After the excavation of the tunnel, the arch frame with refrigeration device is installed, the radiator is arranged inside the arch frame, and the adjacent arch frames are connected by connecting pipes; the ventilation pipe is inserted into the arch frame and led to the tunnel opening, and the exhaust pipe is inserted into the ventilation pipe. The DC power supply is connected with the refrigeration device; the present invention can not only form a frozen soil shell on the surrounding rock around the weak section of the tunnel, prevent water and control the deformation of the tunnel, but also increase tunnel Ventilation improves the construction environment.

Description

technical field [0001] The invention belongs to the technical field of tunnel engineering support structures, in particular to the initial support structure technology for soft surrounding rock tunnel freezing, and is especially suitable for road and railway tunnels passing through weak surrounding rocks. Background technique [0002] In recent years, large-scale transportation infrastructure such as highways and railways have been constructed in the western mountainous areas, and the number of tunnel projects with extremely complex terrain and geological conditions has continued to increase. Weak surrounding rock is one of the most common engineering geological conditions in extremely complex geological conditions. In the construction of tunnels in western mountainous areas, more and more tunnel projects pass through weak surrounding rock. However, the construction of tunnels in weak surrounding rock has always been a worldwide problem. A large number of engineering practi...

AI Technical Summary

Problems solved by technology

[0004] In view of the deficiencies in the construction method of tunnels with weak surrounding rocks mentioned above, based on the principle of protecting the environment, improving the characteristics of weak surrounding rocks, reducing engineering costs, and saving resources, a kind of initial support structure and construction method for tunnel freezing in weak surrounding rocks is provided to solve the problem of traditional weak surrounding rocks. The construction method of rock tunnels has complex procedures, high cost, serious pollution to the surrounding environment, and failure to improve the characteristics of weak surrounding rocks. It can effectively control the shortcomings of large deformation and overall displacement of the tunnel, thereby reducing the waste of materials and human resources during tunnel construction in weak surrounding rocks. Reduce engineering cost and improve tunnel construction safety

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