Tunnel waterproof and drainage system and its construction method

Abstract

The invention discloses a tunnel waterproof and water-draining system and a construction method thereof. The tunnel waterproof and water-draining system comprises a water draining layer, a transition layer, a waterproof layer, a transverse water draining pipe, a central water draining pipe and the like, and the water draining layer, the transition layer and the waterproof layer are located between a tunnel primary support and a secondary lining. The water draining layer comprises water-permeable shotcrete, a longitudinal water draining pipe, an annular water draining pipe and a waterstop strip, the longitudinal water draining pipe, the annular water draining pipe and the waterstop strip are fixed to the outer surface of the primary support to carry out water draining partitioning on the primary support, and the water-permeable shotcrete is sprayed in each water draining area. The annular water draining pipe and the central water draining pipe are connected through the transverse water draining pipe, and finally the tunnel water draining system is formed. The transition layer and the waterproof layer are formed by shotcrete with different grades and used for waterproofness of a tunnel. According to the tunnel waterproof and water-draining system and the construction method thereof, the water draining pipes and the water-permeable shotcrete form a tunnel stereoscopic water draining passage, the water draining effect of the tunnel is good, the tunnel waterproof and water-draining system and the structure of the tunnel are integrated, and the long-term service performance is good.

Description

technical field [0001] The invention relates to a tunnel structure, in particular to a tunnel waterproof and drainage system and a construction method thereof. Background technique [0002] Leakage water is the most common disease in operating tunnels. Tunnel seepage water not only accelerates the aging of tunnel structures, shortens the service life of tunnel structures, but also increases the cost of tunnel operation and maintenance, and threatens the traffic safety of tunnels. Especially in cold regions, water seepage from tunnels can cause freezing damage to tunnels and aggravate tunnel structural damage; it can also cause ice on tunnel walls and icy road surfaces, seriously threatening tunnel traffic safety. The problem of tunnel water leakage must be fundamentally solved. [0003] The "Code for Design of Highway Tunnels" stipulates: "When the composite lining is used for the tunnel, waterproof boards and non-woven fabrics should be installed between the primary suppor...

AI Technical Summary

Problems solved by technology

The existing tunnel waterproof panels are easily damaged during construction and operation. The reasons for the damage of the waterproof panels are as follows: ①The initial support of the tunnel is shotcrete, and the surface of the shotcrete often has protrusions or the ends of the anchor rods are exposed. The waterproof board can be punctured; ② The primary support and secondary lining of the tunnel are often misaligned, which often leads to the tearing of the waterproof board between the primary support and the secondary lining

③ Adjacent waterproof boards are connected by thermal fusion. The connection effect is affected by many factors such as the construction environment, construction level, and management level. The welding parts often appear to be unreliable, and misalignment occurs during service, forming a drainage channel

⑤The service life of the waterproof board is about 60 years, and the operation life of the tunnel is 100 years. The waterproof board cannot meet the long-term service requirements of the tunnel

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