Hole forming technology and device for bored pile construction through down-the-hole hammer

Abstract

The invention discloses a hole forming technology and device for bored pile construction through a down-the-hole hammer. The hole forming technology for bored pile construction through the down-the-hole hammer comprises the steps that (1) the down-the-hole hammer is used for drilling, and chips generated by drilling of the down-the-hole hammer are discharged in the mode of slurry wall protection and the mode of slurry circulation; (2) when drilling is carried out, a power head of a drill rod is set to be in the mode of 180-degree back-and-forth movement, a hose is adopted by a conveying pipe for high-pressure blast which serves as power of the down-the-hole hammer, the conveying pipe is arranged outside the drill rod, the upper portion of the high-pressure blast conveying pipe and the upper portion of a slurry conveying pipe are coiled on winches respectively, the winches rotate along with deepening of drilling, and the high-pressure blast conveying pipe and the slurry conveying pipe appropriately extend; (3) a slurry pump is connected to a rotary joint arranged on the slurry conveying pipe winch, and a rotary joint of the high-pressure blast conveying pipe winch is connected to an air pump; (4) prepared slurry is continuously conveyed to the bottom of a hole, is mixed with the chips generated by the down-the-hole hammer, and is upwards discharged out of the hole. The hole forming technology and device for bored pile construction through the down-the-hole hammer has the advantages that drilling can be rapidly carried out on a hard rock stratum with clay, bored pile drilling of an ultra-deep hole can be carried out, and the construction progress cannot be influenced.

Description

technical field [0001] The invention belongs to the field of engineering machinery, in particular to a hole-forming process and equipment for drilling cast-in-situ pile construction with a down-the-hole hammer. Background technique [0002] Concrete cast-in-situ pile is a widely used pile foundation type at present. Its single pile has a large load capacity and high strength of the pile body. It is mostly used in the foundation and support system of middle and high-rise buildings. There are many ways to form piles. It is a mature construction technology to use the down-the-hole hammer to construct holes in hard rock formations. It uses the cavity in the drill pipe to deliver high-pressure air to the down-the-hole hammer, and the high-pressure air is used as the power source of the down-the-hole hammer to drive the submersible The hammer vibrates and breaks the rock mass, and the wind blows out the rock slag. The disadvantage of this drilling method is that if the hard rock ...

AI Technical Summary

Problems solved by technology

The disadvantage of this drilling method is that if the hard rock formation containing clay is used for construction, the clay will block the air outlet of the down-the-hole hammer, resulting in no ventilation and affecting the construction progress.

Also, when using it for deep pile construction, because the hole is too deep, the gap between the drill pipe and the hole wall will be blocked by debris, resulting in the inability to ventilate and affect the construction.

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