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

Abstract

A static-pressure static-pull apparatus and method for forming the in-situ poured prestressed pile with variable diameter is disclosed. Said apparatus is composed of external pipe, internal core, reinforcing cage between external pipe and internal core, concrete stamper assemblagte between reinforcing cage and external pipe or internal core, open pile tip at lower end of external pipe, and stretching unit for drafting the reinforcing bars of reinforcing cage. Its advantages are high load-bearing power and compression strength of concrete stramper assembage, and high load-bearing power of pile.

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 strong tension deformed 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 casing connected to it downward; ③The cavity structure of the inner and outer casing is driven into the foundation under the protection of the closed valve pile structure; ④The cavity structure of the inner and outer casing sinks into the predetermined When the design depth is reached, concrete is evenly injected into the cavity structure of the...

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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, hammering method cannot be safely constructed in places with dense urban buildings; second, when the open pile tip is forced into the ground, because the pile tip is an inner opening, the inside of the opening After the soil is taken out by the grab bucket, the pressure of the soil in the mouth is far less than that of the soil outside the pile tip. Therefore, when the pile tip is pressed down, the soil in the opening is under the pile tip. Under the action of 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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