Stratum cast-in-situ bored pile with soft upper part and hard lower part

Abstract

The invention discloses a stratum cast-in-situ bored pile with a soft upper part and a hard lower part. The stratum cast-in-situ bored pile comprises a foundation, a strongly weathered granite layer,coarse sand, silty clay, mucky soil, a formed hole, a sleeve, a drill rod, drill teeth, a down-the-hole hammer, a reinforcement cage, vertical reinforcements, connecting reinforcements and a concretefilling mechanism. The stratum cast-in-situ bored pile has the beneficial effects that the drill rod and an outer side sleeve are used for double-combination drilling, an outer side sleeve protectionwall facilitates continuous soil discharging of the drill rod, the overall rigidity is high, the drilling force is large, the hole forming precision is high, the drill rod and outer side sleeve can adapt to powerful drilling of various complex stratums and is suitable for construction of various construction methods, a mud protection wall is replaced with the sleeve following protection wall in the drill rod drilling process, environmental pollution caused by slurry can be reduced conveniently, drilling is conducted through double combination of a drill rod drill bit and the outer side sleeve,hole forming can be achieved conveniently and rapidly, dust is little, noise is low, environmental pollution is small in the hole forming process, the reinforcement cage is hung on the steel casing through threaded steel bars, and the reinforcement cage can be prevented from falling off the cage or floating in the pouring process.

Description

technical field [0001] The invention relates to a cast-in-situ pile, in particular to a drilled cast-in-place pile in a stratum with a soft top and a hard bottom, and belongs to the technical field of building construction. Background technique [0002] In the subway construction, the construction quality and construction efficiency of the enclosure structure bored piles are very important. In today's society with increasing economic growth and rapid development, civilized construction has been concerned by the masses, owners, government and other supervision and management departments. Civilized construction management in the pile foundation construction process is also an important and difficult point in subway construction. The application of existing drilling rigs cannot fundamentally solve the problem of holes that are easy to collapse in upper soil and sand layers and difficult to drill into hard rock layers. The problem of holes, and the construction noise is small an...

AI Technical Summary

Problems solved by technology

[0002] In the subway construction, the construction quality and construction efficiency of the enclosure structure bored piles are very important. In today's society with increasing economic growth and rapid development, civilized construction has been concerned by the masses, owners, government and other supervision and management departments. Civilized construction management in the pile foundation construction process is also an important and difficult point in subway construction. The application of existing drilling rigs cannot fundamentally solve the problem of holes that are easy to collapse in upper soil and sand layers and difficult to drill into hard rock layers. hole, and the construction noise is small and the pollution is big, which is not conducive to civilized construction

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