Apparatus and method for constructing shape-variable pile in situ by static pressure and drawing

Abstract

A static-pressure static-pull method and apparatus for forming the in-situ poured prestressed pile with varible diameter is disclosed. Said apparatus is composed of external pipe, internal core, concrete stamper assemblage between internal core and external pipe and open pile tip at the lower end of external pipe. Its advantages are no deformation of peripheral earth layer, high density and load-bearing power of pile, and easy demoulding as internal air bag is used.

Description

Technical field: [0001] The invention relates to a forming device and a forming method of a static pressure and static pulling cast-in-place modified pipe pile, belonging to the field of pipe pile manufacture. Background technique: [0002] Authorized announcement number CN1158434C, name "composite construction method of large-diameter cast-in-place pipe pile for soft foundation treatment", the construction method: ① Arrange the outer tube molded large-diameter cast-in-place pipe pile machine at the foundation to be piled; ② Start the vibrating head Vibrates downward, driving the cavity structure of the inner and outer tubes connected to it downward; ③The cavity structure of the inner and outer tubes is driven into the foundation under the protection of the closed valve pile structure; ④The cavity structure of the inner and outer tubes sinks into the predetermined When the design depth is reached, concrete is evenly injected into the cavity structure of the inner and outer t...

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Problems solved by technology

[0004] Design scheme: 1. Designing the pile point as an open pile point is one of the characteristics of the present invention. The function of the open pile point is: first, when the static pressure pile hole is matched with the outer pipe, the soil in the outer pipe is taken out by the grab (When falling, the claws in the grab bucket open automatically, and under the action of gravity and gravitational acceleration, they are directly inserted into the ground along the inner wall of the outer tube to grab the soil; when rising, the claws of the grab bucket automatically close to grab the soil Gather in the grab bucket, put forward and dump), so it can effectively avoid the defect of geological deformation around the pile produced by the static pressure pile hole, ensure the foundation quality of the buildings around the pile, and solve the technical problems existing in the background technology- ---Static pressure method, vibration method and hammering method cannot be safely constructed in places with dense urban buildings; the second is that when the open pile tip is forced into the ground, due to the inner opening of the pile tip, the opening After the soil in the mouth is taken out by the grab bucket, the pressure on the soil in the mouth is far less than that on the soil outside the pile tip. Under the action of downward pressure, it will automatically turn up into the opening of the pile tip, so that the soil in the opening becomes relatively loose, which is convenient for grabbing soil

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