Double-pipe construction method for static pressure pipe-sinking carrier cast-in-place pile

Abstract

The invention provides a double-pipe construction method for a static pressure pipe-sinking carrier cast-in-place pile. The carrier pile is manufactured through a static pile driver, an inner pipe and an outer pipe. Throwing of a carrier concrete material is completed at a time, the pile-forming period is shortened, energy is saved, and the environment is protected; and the pull resistance of the manufactured pile is improved remarkably. The double-pipe construction method includes the following steps that firstly, a site is cleaned, surveying and setting-out are conducted, and the pile driver is moved to a station; secondly, the inner pipe and the outer pipe are pressed to the designed elevation; thirdly, concrete required by a carrier is thrown into the inner pipe at a time; fourthly, the inner pipe and the outer pipe are up-pulled to the set height together, and a space formed when the inner pipe and the outer pipe are up-pulled can be filled with the carrier concrete automatically; fifthly, the inner pipe is lowered, the bottom end of the inner pipe extends out of the bottom end of the outer pipe, the inner pipe and the outer pipe are pressed downwards, the downward pressing force and the elevation reach the preset numerical value, and the expanded carrier is formed; sixthly, the inner pipe is lifted out of the outer pipe; seventhly, concrete is poured into the outer pipe, or a reinforcement cage is placed in the outer pipe firstly, and pile body concrete is poured; and eighthly, the inner pipe is put into the outer pipe, the outer pipe is up-pulled while vibrating, and the pile is formed.

Description

technical field [0001] The invention relates to the field of building foundation construction, in particular to a pile-forming construction method using an inner tube and an outer tube for a cast-in-place pile with a static pressure sinking tube carrier. Background technique [0002] In the foundation engineering of various buildings and structures in our country, piles of various structures are often used by construction units for foundation treatment and reinforcement. At present, carrier piles are a brand-new construction technology, which has changed the traditional concept of foundation treatment. The soil layer with stable and good soil properties is used as the soil layer to be reinforced, and the soil at the pile end is taken as the research object. The bearing capacity of ordinary piles mainly comes from the side friction resistance of piles, while the bearing capacity of carrier piles mainly comes from the carrier. Therefore, Carrier piles are widely used due to ...

AI Technical Summary

Problems solved by technology

[0007] From the above, it can be concluded that the main problems of using the static pile driver for construction are: (1) Only the static pressure sinking pipe composite bottom expansion grouting pile, conventional static pressure sinking pipe grouting pile and prefabricated pipe pile can be constructed , unable to achieve effective construction of carrier piles

(2) In the process of making static pressure immersed tube composite bottom expansion grouting piles, the equipment has the problems of batches of repeated feeding, multiple batches of repeated pressing, slow construction speed, and seriously affecting the progress of the project

(3) The reinforcement cage cannot enter the inside of the expansion head, and it is difficult to meet the pullout requirements when used as an uplift pile

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