Precast tubular pile and construction method thereof

Abstract

The invention provides a precast tubular pile and a construction method thereof. The precast tubular pile comprises a first section of the precast tubular pile, a second section of the precast tubular pile, centering and position-limiting devices and expandable steel nodes, wherein the outer diameter of the second section of the precast tubular pile is smaller than the inner diameter of the first section of the precast tubular pile; the second section of the precast tubular pile is arranged in the first section of the precast tubular pile in a penetrating manner; the sinking depth of the bottom end of the second section of the precast tubular pile is larger than the sinking depth of the bottom end of the first section of the precast tubular pile; a concrete conical pile tip or a steel plate combined conical pile tip is arranged at the bottom end of the second section of the precast tubular pile; the height of the conical pile tip is no smaller than the diameter of the outer contour of the conical pile tip; the centering and position-limiting devices used for restraining the second section of the precast tubular pile are arranged on the inner wall of the first section of the precast tubular pile or the outer wall of the second section of the precast tubular pile in the length direction; the expandable steel nodes connected to the bottom end of the first section of the precast tubular pile through a welding manner or through a bolt connection pair comprise outrigger steel plates capable of bilaterally expanding to be inserted into a foundation. The precast tubular pile and the construction method have the advantages that pile sinking resistance and pile driving noise are reduced, the sinking and the construction of long piles are facilitated, the bearing effect of a soil layer over the piles is remarkably improved and the aims of pile material conservation and cost reduction are achieved.

Description

technical field [0001] The invention relates to foundation and structural engineering, in particular to prefabricated pipe piles in soft ground and underwater pile foundation engineering and its construction method. Background technique [0002] Prefabricated concrete pipe piles are usually used in soft soil foundations to improve the bearing capacity of the soil layer. [0003] For example, Chinese Patent Application No. CN200410026687.2 discloses a steel pipe enlarged head pile and its manufacturing method, that is, a spiral wing plate is welded on the outer wall of the lower end of the steel pipe, and a plurality of grouting holes are opened on the steel pipe wall between the wing plates. After the steel pipe is drilled to a predetermined depth, it is left in the soil, and then the cement slurry is poured under high pressure to form an enlarged and high-strength cement-soil inclusion around the outer wall of the steel pipe in the flange section, which can reduce construct...

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Problems solved by technology

[0005] The above method has the following problems: Patent Application No. CN200410026687.2 can only be used for pile driving by drilling method, so it is not suitable for pile driving by drilling method for piles with large pile length, large pile diameter, complex construction conditions or geological conditions The situation is invalid

Patent application number CN20101056041.X needs to add an additional set of lifting cables and cones, and put the lifting cables and cones into the pile holes during the pile sinking process, which not only affects the pile sinking construction, but also tends to cause lifting failure and cannot be pushed and expanded In the case of sectioned steel pile tips or expanded steel joints

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