Cast-in-place large-diameter pipe pile casing pipe and construction method

Abstract

The invention discloses a cast-in-place large-diameter pipe pile casing pipe which comprises a main casing pipe body, a lower-end outer casing pipe body, feeding pipes and a valve pile shoe. The main casing pipe body and the lower-end outer casing pipe body are concentric cylindrical barrels, the lower end of the outer side of the main casing pipe body is sleeved with the lower-end outer casing pipe body, and the lower-end outer casing pipe body is attached to the outer wall of the main casing pipe body to form a closed cavity. The lower end of the lower-end outer casing pipe body is connected with the valve pile shoe. The feeding pipes are arranged on the outer wall of the main casing pipe body, and the lower ends of the feeding pipes stretch in the closed cavity formed between the lower-end outer casing pipe body and the main casing pipe body. Pile-forming quality is effectively guaranteed, disturbance to soil and generation of a soil extrusion effect are reduced, and the phenomena of wall collapsing, wall shrinking, pile breaking and the like are avoided; pile subsoil is prevented from being brought upwards through the horn-shaped main casing pipe body at the upper end, and bearing capacity is increased; and the structure is simple, the principle is clear, the manufacturing cost is low, and wide application prospects and good economic and technological benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of civil engineering, and in particular relates to a cast-in-place large-diameter pipe pile casing and a construction method. Background technique [0002] Before the present invention, cast-in-place large-diameter thin-walled pipe piles have been more and more widely used in engineering fields such as roads, municipal administration, ports, wharves and railways. [0003] The utility model patent with the announcement number CN2515246 "Casing molded large-diameter cast-in-place pipe pile machine for soft foundation treatment" and the invention patent with the announcement number CN1367296 "Construction method for large-diameter cast-in-place pipe pile composite foundation for soft foundation treatment" The middle average has a large specific surface area per unit volume of material, so it can greatly reduce the amount of material used under the same bearing capacity of a single pile, save cost, improve cost ...

AI Technical Summary

Problems solved by technology

[0006] Purpose of the invention: the present invention provides a cast-in-place large-diameter pipe pile casing and a construction method to solve the problems of wall collapse, shrinkage cavity and pile head that are prone to cracks in the prior art

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