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.