Supporting steel frame for weak surrounding rock tunnel and construction method

Abstract

The invention relates to a supporting steel frame for a weak surrounding rock tunnel. The supporting steel frame for the weak surrounding rock tunnel comprises a lining layer, a concrete spraying layer, an initial supporting layer, anchor rods, a supporting rigid frame, a drainage system and a top connecting steel base operating platform vehicle; the initial supporting layer is located in the outermost layer of the tunnel, the concrete spraying layer is arranged on the inner side of the initial supporting layer, and the lining layers arranged on the inner side of the concrete spraying layer; the supporting rigid frame is arranged on the inner side of the lining layer, the anchor rods penetrates into the surrounding rock of the initial supporting layer, and the inner ends of the anchor rodsare connected with the supporting rigid frame; the drainage system is arranged on the ground of the tunnel, and the drainage system comprises a reserved drainage, drainage channels and drainers. Thesupporting steel frame for the weak surrounding rock tunnel has the beneficial effects that a anchor structure is provided with an own monitor, the stability of the overall structure can be monitoredin time, and timely warning can be achieved before the accident, so that the construction of the pressure-receding anchor structure is convenient, and the structure is simple; and other excessive structures for playing the role of pressure-receding are not required, and good economic and technical benefits are achieved.

Description

technical field [0001] The invention relates to a supporting steel frame and a construction method, in particular to a supporting steel frame and a construction method for tunnels with weak surrounding rocks. Background technique [0002] With the development of tunnel construction to deeper and more complex strata, there are more and more problems of large deformation of soft rock. With the rapid development of high-grade highways, the construction methods of long-span soft rock highway tunnels are also constantly developing. Side wall pilot pit method, middle partition wall method, etc. However, in engineering practice, it is found that the double-side wall pilot pit method and the partition wall method have the following disadvantages: first, the use of large-scale construction machinery is limited, and work efficiency is reduced; second, in the tunnel construction with soft and hard surrounding rocks, the construction The adjustment time of the method is very long; the ...

AI Technical Summary

Problems solved by technology

However, in engineering practice, it was found that the double-side wall pilot pit method and the partition wall method have the following disadvantages: first, the use of large-scale construction machinery is limited, and work efficiency is reduced; second, in the tunnel construction with soft and hard surrounding rocks, the construction The adjustment time of the method is very long; the third is that there are many temporary construction supports, the investment is large, and it is uneconomical; the fourth is that there is a lot of mutual interference in the construction; the fifth is that the waterproof layer and concrete lining are constructed in parts, and there are many operational defects

Bolt support is the most commonly used measure to control the large deformation of the surrounding rock. However, it is difficult for the traditional bolt to achieve an effective support effect in the large deformation tunnel. The main reason is that the allowable deformation of the traditional bolt is small. When the deformation and deformation of the surrounding rock exceed the bearing range of the traditional bolt, the bolt will be broken and damaged, which will cause the support structure to fail and be destroyed

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