Segment composite structure in water-rich formation and its construction method

Abstract

The invention discloses a water-rich stratum pipe piece combination structure and a construction method thereof. The combination structure comprises a plurality sets of jointed pipe pieces. Grouting walls are arranged on the outer sides of the pipe pieces and made of water-permeable grouting materials. Second lining concrete is arranged on the inner sides of the pipe pieces. Waterproof layers are arranged between the pipe pieces and the second lining concrete. According to the water-rich stratum pipe piece combination structure and the construction method thereof, the water-permeable materials are selected and used for the grouting walls, circular flow of underground water is restored, water and soil loss is relieved, and the ground ecosystem is protected. In the grouting process, the condition of too large grouting quantity or grouting pipe blocking is not liable to occur. Bentonite expands when encountering water, and holes of a water-rich stratum can be fully filled, so that ground subsidence caused by construction is reduced. The waterproof layers are additionally arranged between the pipe pieces and the second lining concrete, and the waterproof function of the pipe pieces and the function of rubber water stopping strips are combined, so that the waterproof effect is greatly promoted. Even if cracks occur to the second lining or water seepage occurs to the pipe pieces, water can be effectively prevented from entering a tunnel, and possibility is provided for long-term water prevention.

Description

technical field [0001] The invention relates to the field of shield tunnel segment structures, in particular to a combined structure of segment segments in water-rich formations and a construction method thereof. Background technique [0002] With the continuous development of national rail transit, shield tunneling technology has been widely used for its fast construction speed, low impact on the surrounding environment and high economic benefits. When the shield tunnel passes through various water-rich strata, it faces complex waterproof problems, which poses a huge challenge to tunnel builders; at the same time, tunnel construction has a significant impact on groundwater runoff, drainage, recharge, and recharge, especially in For cities with a relatively large proportion of groundwater, the construction of subway tunnels has seriously damaged the circulation path of groundwater, resulting in a drop in water level and environmental damage, which is not conducive to the sus...

AI Technical Summary

Problems solved by technology

However, most of the secondary lining is plain concrete, which is prone to cracks due to the deformation and expansion of the tunnel caused by the load change after the completion of the tunnel.

In addition, the ready-made pouring concrete used for the secondary lining will be constrained by the unevenness of the inner surface of the segment on the back side, and cracks are likely to occur due to drying shrinkage and temperature stress, and there are construction joints that are unfavorable for waterproofing

Therefore, for many years after the completion of the tunnel construction, water leakage is prone to occur in the lining, and it is impossible to expect a high waterproof effect of the secondary lining

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