Construction method of expanded-base cast-in-place pile in gravel-cobble soil layer

Abstract

The invention discloses a construction method of a expanded-base cast-in-place pile, and particularly relates to a construction method of a expanded-base cast-in-place pile in a gravel-cobble soil layer. The construction method comprises the following steps of 1, drilling by adopting a spiral drill rod of a casing pipe type long spiral drilling machine, synchronously drilling or vibrating and sinking a casing pipe into a soil body, and lifting the spiral drill rod until enabling the spiral drill rod to be drilled to a set hole depth; 2, placing a reinforcement cage in a pile hole formed by the drilling; 3, firstly, adopting the spiral drill rod of the casing pipe type long spiral drilling machine again to go deep into the bottom of the pile hole where placing a reinforcement cage, then synchronously lifting the casing pipe by a set height, then lifting the spiral drill rod, and continuously pouring concrete into the pile hole in a pressing mode through the spiral drill rod in the whole lifting process till enalbing the pile hole to be full of the concrete; and 4, after completing the concrete pouring, pulling out the casing pipe, and construction is completed. According to the construction method, the technical problem of bottom-expanding cast-in-place pile construction in a gravel-cobble soil layer is solved and the construction method has the advantage of being simple in construction process.

Description

technical field [0001] The invention relates to a construction method of a bottom-expanding cast-in-situ pile, in particular to a construction method of a bottom-expanding cast-in-place pile in a gravel soil layer. Background technique [0002] Cast-in-place pile is a kind of pile made by forming holes in place and pouring concrete or reinforced concrete. Bored cast-in-situ pile is a commonly used cast-in-situ pile, which is formed by pouring concrete into holes in situ by using auger drilling rigs, submersible drilling rigs, etc. [0003] Long auger drilling rig, also known as long auger pile driver. The machine mainly includes two parts: hydraulic walking pile frame and drilling system. The upright is controlled by two luffing hydraulic cylinders. The drilling system includes a power head and a drilling tool. The output shaft of the power head and the auger drilling tool are hollow, and a long helix is ​​used to form a hole. The concrete (or mud) can be pumped through t...

AI Technical Summary

Problems solved by technology

The industry is basically at a loss for the construction of bottom expansion piles in this kind of soil layer

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