A drainage type segment for tunnel lining

Abstract

The invention discloses a drain-type pipe piece for tunnel lining. The drain-type pipe piece comprises a reinforced concrete pipe piece (1), a slurry injection hole (or a hoist hole) (1a) in the pipe piece (1), a load bearing steel bar (1b), and a concrete protective layer (1c) on the outer side; a water stop rubber block (2) capable of being expanded when being in contact with water is preburied in the concrete protective layer (1c) right opposite to one or two slurry injection holes (1a) of the pipe piece (1); a self-advancing type hollow anchor rod (3) is inserted in the slurry injection holes (or the hoist hole) (1a) of the pipe piece (1), then penetrates the water stop rubber block (2), and shoots out of the concrete protective layer (1c); and drain holes (3a) are formed in the rod wall of the outer end of the self-advancing type hollow anchor rod (3), and a filter column (4) used for filtering sand is plugged in the inner cavity of the self-advancing type hollow anchor rod (3). Lining built with the pipe pieces has a reliable drain function, and can reduce water pressure around the structure to ensure tunnel safety; and construction is convenient, small damage is caused to the pipe piece lining structure, and construction cost of the pipe piece lining is low.

Description

technical field [0001] The invention relates to a segment for tunnel lining. Background technique [0002] For long and deep buried tunnels, when the closed tunnel boring machine (TBM) is used for construction, the corresponding fabricated segment lining (the lining is assembled by multi-ring segments along the longitudinal direction of the tunnel, and each ring segment is composed of the number The different prefabricated reinforced concrete segments connected by hoop bolts) are all closed linings and cannot be drained to reduce the water pressure around the structure. [0003] With the development of my country's railway and highway tunnels, there will be a large number of long-scale (length greater than 10km) and large-scale (200-500m) deep buried tunnels. Due to its deep burial and high groundwater pressure, the existing closed segment lining structure will bear the high external water pressure in the surrounding rock, which increases the construction cost of the segmen...

AI Technical Summary

Problems solved by technology

Due to its deep burial and high groundwater pressure, the existing closed segment lining structure will bear the high external water pressure in the surrounding rock, which increases the construction cost of the segment lining

At the same time, groundwater pressure is affected by uncontrollable factors such as weather, resulting in serious safety hazards in segment lining

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