Lattice type prefabricated prestressed underground continuous wall and its construction method

Abstract

The invention discloses a latticed type precast prestressed underground diaphragm wall, comprising a precast wall body, wherein two rows of prestressing steel strands vertically pass through the inside of the precast wall body; the prestressing steel strands apply prestress after the concrete strength of a concrete wall body reaches over 80 percent, and the upper and lower end faces of the precast wall body are locked by prestressing anchorage device; two rows of the prestressing steel strands are connected at intervals through transverse structure reinforcing steel bars along the height direction; joint parts on two sides of the precast wall body are of a concave semicircular shape; a protective layer is concreted on the periphery of each prestressing steel strand; and a hollow through hole throughout the height direction of the wall body is arranged inside the precast wall body. The diaphragm wall is concreted and precast on the ground, which can well guarantee the shape, size and density of the wall body, ensures that the quality of the wall body cannot be affected by strata or slurry wall, and can thoroughly eradicate joint mud inclusion, wall body sand inclusion, reinforcing steel bar exposure, loosening, wall surface protuberance, water leakage, sand shifting and other quality qualitative common faults.

Description

technical field [0001] The invention relates to a prefabricated prestressed underground continuous wall, in particular to a lattice type prefabricated prestressed underground continuous wall and a construction method of the underground continuous wall. Background technique [0002] The existing underground diaphragm walls mainly include the following types: [0003] 1. In-situ cast-in-place underground diaphragm wall: This is a form of underground diaphragm wall commonly used at present. The method is to first make the guide groove and tie the steel cage, and then use the groove grabbing machine to form the groove. After the trough is formed, the reinforcement cage is placed, the conduit is lowered for underwater concrete pouring, and the lock-back pipe is used to divide the wall section. This technology has the following defects: (1) The quality of the trough is significantly affected by the formation, because the reinforcement must be placed in the trough Cage, the wall ...

AI Technical Summary

Problems solved by technology

[0007] The problem to be solved by the present invention is to provide a wall that can well ensure the shape, size and compactness of the wall, and can completely eradicate problems such as mud inclusions in joints and sand inclusions in the wall, and the wall can be easily positioned in the groove. Lattice prefabricated prestressed underground diaphragm wall and its construction method to overcome the above-mentioned defects in the prior art

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