Combined pile foundation equipment for rapid hole formation in complex geology

Abstract

The invention relates to the technical field of construction equipment for building foundation engineering, in particular to combined pile foundation equipment for rapid hole formation in complex geology. The combined pile foundation equipment comprises a cylinder body which is formed by sequentially splicing a plurality of sections of protection cylinders and internally and fixedly provided witha fixed disc, a connecting cylinder arranged on the cylinder body and rotatably connected with the cylinder body, a hydraulic vibration hammer arranged at the top of the connecting cylinder, arotary excavating machineused for driving the fixed disc to rotate and a plurality of drill bits circumferentially arranged along the bottom of the cylinder body, wherein the diameter of circumscribed circlesof parallel projections of the multiple drill bits on the horizontal plane is larger than the outer diameter of the cylinder body. The combined pile foundation equipment has the advantages of reducing the side friction force between a steel protection cylinder and ahole wall and improving the drilling efficiency, and the problem of wall protection is solved.

Description

technical field [0001] The invention relates to the technical field of building foundation engineering construction equipment, in particular to a pile foundation combination equipment used for rapid hole formation in complex geology. Background technique [0002] Bored cast-in-situ pile refers to the pile hole formed in the foundation soil by means of mechanical drilling, steel pipe extrusion or manual excavation on the project site, and a steel cage is placed in it and concrete is poured into it. [0003] At present, when drilling complex strata, such as strata containing miscellaneous fills, sandy pebbles, boulders and boulders, the common method is to use a steel casing and a pipe twister to cooperate, and the rotary excavator will first drill the hole. Excavate the slag, and then the pipe rubbing machine drives the steel casing to follow up at any time to prevent the hole wall or hole from collapsing during the drilling process. [0004] However, if the pile length is t...

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Problems solved by technology

[0004] However, if the pile length is too long (such as exceeding 40 meters), the depth of the borehole will also increase accordingly, so that the side friction resistance between the steel casing and the hole wall will be too large when the steel casing is drilled downward. , so that the pipe rubbing machine does not move, and it is easy to get stuck so that the rigid casing cannot be pulled out from the hole. When there is a boulder, after drilling through the rock formation with the rotary excavator, it is necessary to use the reaming drill for secondary drilling. The casing can only be lowered after the first reaming, which is time-consuming and the drilling efficiency is low

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