Construction method of immersed tube club-footed bored concrete pile

Abstract

A method of applying pipeline sinking and foot expanding means to construct bored concrete pile includes sinking pile pipe at certain depth of underground, loading solid packing materials including hard concrete into pile pipe and tamping them out from bottom end of pile pipe to form expanded head then depositing concrete pile body on it.

Description

technical field [0001] The invention relates to a construction method of a tube-immersed and bottom-expanding cast-in-situ pile among poured-in-place concrete piles in building foundation construction. Background technique [0002] The construction methods of concrete piles as building foundations can be divided into two categories: prefabricated concrete piles and in-situ poured concrete piles. Among them, there are many kinds of construction methods for pouring concrete piles in place, and a variety of construction equipment and construction techniques have been developed for different stratum conditions. The pile body hole forming process includes drilling, punching, digging, spiral hole forming and immersed tube hole forming. [0003] In order to increase the bearing capacity of the pile end, an enlarged head is often formed at the bottom of the pile end. Bottom expansion technology includes drilling expansion, explosion expansion, compression expansion, tamping expans...

AI Technical Summary

Problems solved by technology

At the same time, when this construction method encounters a highly viscous soil layer, because the soil adheres to the surface of the rammer, it is not only difficult to pull out the hammer, but also cannot achieve free fall when hammering, which greatly weakens the hammering force and sinks The speed of the pipe is low, and the phenomenon of soil splashing from the inside of the pipe is serious; and when construction is carried out in a stratum with abundant groundwater and good water permeability, the water hammer effect will weaken the hammering force, and water will also splash out from the pipe. Affect the surrounding environment; when encountering hard plastic to hard cohesive soil layers, it is difficult for the tamper to squeeze the soil layer, and it is difficult to press the pile pipe into the pebble layer, so not only the sinking speed is slow, but even the sinking pipe cannot be immersed

On the other hand, when constructing in the soil layer where the soil squeezing effect is serious, there will also be quality problems such as broken piles, necking and hanging feet.

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