TBM duct piece exterior drainage structure and construction method thereof

Abstract

The invention discloses a TBM duct piece exterior drainage structure which mainly comprises duct pieces, filling auxiliary materials and bolts. duct piece drainage grooves are formed in the outer surfaces of the duct pieces. The duct piece drainage grooves in the edges of the duct pieces can enable adjacent duct pieces on the same ring and the duct pieces on the adjacent ring to be communicated toform a continuous passage. The filling auxiliary materials are arranged in the duct piece drainage grooves. The filling auxiliary materials comprise impermeable materials, coarse grain size materialsand porous square ducts. Any one of the impermeable materials, the coarse grain size materials and the porous square ducts is arranged in the duct piece drainage grooves according to the conditions of surrounding rocks. The filling auxiliary materials in the duct piece drainage grooves in the edges of the adjacent duct pieces can be contacted and communicated mutually. Drainage pitches are arranged in the surfaces of the duct pieces, and are contacted and communicated with the drainage grooves. Locking devices are arranged at two ends of the side of each duct piece. The construction method comprises the following construction steps: prefabricating or digging the duct piece drainage grooves, and mounting and filling the filling auxiliary materials. The TBM duct piece exterior drainage structure can drain underground water outside the TBM duct pieces to relief pressure, so that the water pressure outside the duct pieces is reduced, and the duct piece lining system is enabled to be safe.

Description

technical field [0001] The invention relates to the technical field of underground engineering, in particular to an external drainage structure of a TBM segment and a construction method thereof. Background technique [0002] Segment is a structural type widely used in TBM excavation tunnels. The lining system is composed of multi-ring segments along the longitudinal direction of the tunnel, which is used to resist the later deformation of rock mass and soil layer and achieve the purpose of support. Usually, rubber sealing gaskets are generally arranged between the segment blocks and between the rings to prevent the external water from infiltrating. Segments are usually prefabricated in the segment factory, then transported to the TBM machine, assembled into a ring by the segment installer to form a complete lining, and backfilled with pea gravel concrete or Mortar is used to fix the segment or form a dense water blocking body, and a dense water blocking layer is formed thr...

AI Technical Summary

Problems solved by technology

[0003] At present, for tunnel projects, the problem of groundwater leakage in the segment lining system of TBM construction can be dealt with by long-term precipitation after completion or secondary drainage system in the later stage of the segment lining cavity, resulting in a large increase in project cost

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