Plastic sleeve concrete pile and method thereof for reinforcing soft soil foundation

Abstract

The invention relates to a plastic sleeve concrete pile and a construction method thereof. the plastic sleeve concrete pile comprises a cover board, plastic sleeves, pile tips, concrete and sleeve joints, wherein the top of each plastic sleeve is connected with the cover board and the lower part is connected with each pile tip, every two plastic sleeves are connected by the sleeve joint, and the concrete is poured in the plastic sleeves. The construction method comprises the following steps: connecting the prefabricated pile tips with the plastic sleeves, pulling the plastic sleeves together with the pile tips into an immersed tube after lifting the immersed tube at a certain height, starting a plastic sleeve concrete pile driver to drive the plastic sleeves with the pile tips together into the pile length designed depth, lifting the immersed tube after filling water into the plastic sleeves until 1/2-2/3 of pile length but remaining the plastic sleeves and the pile tips into the foundation, pumping filled water in the plastic sleeves, and pouring a concrete pile body and the cover board into the plastic sleeves to be made into the plastic sleeve concrete pile. The plastic sleeve concrete pile has small soil extrusion action, uneasy broken pile, flexible and rapid construction, easy control of pile body quality, higher bearing capacity of single pile and good cost performance; and the pouring is not influenced by outside.

Description

technical field [0001] The invention relates to a pile type of foundation engineering, in particular to a method for reinforcing and treating soft ground with a plastic casing concrete pile. Background technique [0002] At present, piled embankments have become a common foundation treatment method in expressway, high-speed railway, municipal, airport and other projects. Before the invention of the present invention, embankment piles were based on flexible piles such as cement-soil mixing piles and rigid piles such as vibration sinking pipe piles, prestressed pipe piles, and bored piles. Cement-soil mixing piles (including slurry-sprayed piles and powder-sprayed piles) are flexible piles with low pile body strength and low cost, but the construction quality is not easy to control. The effect is not as ideal as that of prefabricated piles. In the high fill section, the bearing capacity is required to be high and a large number of piles is required, which makes the cost very ...

AI Technical Summary

Problems solved by technology

However, it also has obvious defects: the effect of pile-forming soil squeezing makes the plastic casing easy to deform or even be damaged; due to the limitation of its own weight and power system, it is difficult for the crawler-type hydraulic drilling machine to pass through when encountering hard soil layers. Difficult, and the depth of driving is shallow; the expansion of the pile will greatly disturb the soil around the pile, and the frictional resistance of the pile body will be weakened; the insertion of the plastic sleeve into the immersed tube requires the immersed tube or mechanical tilting, righting, vertical, and centering. The process, which takes a long time, greatly affects the construction speed and increases the construction cost

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