A kind of shallow buried underground tunnel waterproof construction method

Abstract

The invention relates to a waterproof construction method of a shallow-buried underground excavation tunnel. The waterproof construction method of a shallow-buried underground excavation tunnel includes six steps. The surface of the steel frame is sprayed with at least two layers of two-component polyurethane waterproof coating with a set thickness, and a water stop ring whose shape matches the vertical steel frame is installed at the circumferential position of the cross section of the vertical steel frame; Set up a waterproof reinforcement layer at the welded connection between the steel frame and the top horizontal steel frame and perform closing treatment; then carry out initial support surface treatment, so that the thickness of the primary support and re-sprayed concrete is less than the laying length of the waterproof reinforcement layer on the vertical steel frame ; Before the second lining, the horizontal temporary support is removed, and the high-density polyethylene waterproof board and geotextile with a set thickness are laid. The high-density polyethylene waterproof board and geotextile are sealed and connected with the waterproof reinforcement layer. Improve the waterproof effect and improve the quality of underground tunnel construction.

Description

technical field [0001] The invention relates to the technical field of comprehensive pipe gallery engineering constructed by a shallow-buried underground excavation method, in particular to a waterproof construction method for shallow-buried underground excavation tunnels. Background technique [0002] Shallow burial and underground excavation method refers to the premise of improving the geological conditions in the weak surrounding rock formation, focusing on controlling the surface settlement, using grids and anchor shotcrete as the initial support means, following the "New Austrian Method" theory, according to The "Eighteen Characters" guideline (advanced pipe, strict grouting, short excavation, strong support, quick closure, frequent measurement) is used for tunnel design and construction. Shallow burial and underground excavation have flexible structural forms, have little impact on ground buildings, roads, and underground pipelines, and have the advantages of less lan...

AI Technical Summary

Problems solved by technology

The temporary support in the whole process includes the vertical steel frame 101 and the horizontal steel frame 102. The initial support includes the top support 103, the side support 104 and the bottom support. When the second lining is constructed, only the horizontal steel frame 102 Removed, the vertical steel frame 101 is directly poured in the partition wall, since the vertical steel frame 101 passes through the concrete of the second lining roof and the second lining concrete at the same time, and the concrete of the second lining roof is under the top support 103, when the concrete shrinks , gaps are likely to appear between the vertical steel frame 101 and the concrete of the second-lining top slab and the concrete of the second-backing slab, and the risk of water seepage downward along the vertical steel frame 101 is likely to occur, which affects the construction quality of the comprehensive pipe gallery

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