Fabricated tunnel support system and construction method thereof

Abstract

The invention discloses a fabricated tunnel support system and a construction method thereof. The fabricated tunnel support system comprises main structures such as an advanced support, a flexible support and a rigid support, and all structural layers are constructed sequentially according to construction processes. The advanced support is formed by reinforcing surrounding rocks by advanced small pipe grouting, the flexible support is formed by splicing prefabricated foam concrete blocks through bolts, joints among all the prefabricated foam concrete blocks are subjected to sealed waterproofing through elastic rubber gaskets, the rigid support comprises concrete-filled steel tube arches and prefabricated reinforced concrete segments, the concrete-filled steel tube arches are vertically arranged at intervals along the circumferential direction of a tunnel, the positions among the concrete-filled steel tube arches are filled with the prefabricated reinforced concrete segments, every two adjacent concrete-filled steel tube arches are connected through longitudinal rebars, steel tubes are circumferentially connected through sleeves, and the prefabricated reinforced concrete segments are connected through bolts. The fabricated tunnel support system is simple in process, rapid in construction progress, high in quality and good in waterproof effect while tunnel structural safety is guaranteed effectively.

Description

【Technical field】 [0001] The invention relates to the technical field of tunnel construction support, in particular to a tunnel assembly support system and a construction method thereof. 【Background technique】 [0002] In recent years, with the rapid development of traffic construction in the loess area of ​​western my country, a large number of loess tunnels have been built in Henan, Shaanxi, Gansu, Qinghai and other places. The design and construction of loess tunnels still use the new Austrian method widely used in rock tunnels in the past. Shotcrete is used as the primary support. After the deformation is basically stable, the secondary lining is applied. The secondary lining is mainly used as a safety reserve. However, due to the great difference in the mechanical properties of loess and rock, it has significant water collapsibility, and water is bound to be entrained in shotcrete, and the loess surrounding rock absorbs the moisture in the concrete and tends to become u...

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Problems solved by technology

[0004] The purpose of the present invention is to address the defects and deficiencies in the prior art, to provide a tunnel assembly type support system and its construction method, which can effectively solve the common problems of large deformation, water leakage and lining cracking in loess tunnels at present, To ensure the safety and stability of the tunnel structure

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