Vibrating bar-inserting long spiral air-cooled drilling rock-socketed pile forming method and equipment

Abstract

The invention relates to a vibrating bar-inserting long spiral air-cooled drilling rock-socketed pile forming method implemented in sub-hard rocks, soft rocks and weathered rocks, gravel soil layers or hard soil layers. The method comprises the following construction steps of: a, starting an air compressor, and discharging the compressed air from the air outlet of a long spiral rock-socketed drill bit by a blast pipe, a fluid director and an air pipe attached to a spiral drill rod; b, injecting the compressed air to cool the drill bit at the same time of long spiral drilling; c, reaching the designed hole depth; d, pouring concrete into the pile hole by using a concrete conveying pump; and e, vibrating and inserting a steel bar cage to the designed depth in a main rib pulled mode by adopting a vibrating hammer. Because the air can be continuously supplied to the drill bit, the drill bit is effectively cooled and the service life of the drill bit is greatly prolonged, and meanwhile, the drillability of the gas phase in the three-phase ratio of the soil is improved; therefore, the green construction technical process for a vibrating bar-inserting drilling pressure pouring pile can be adopted in the sub-hard rocks, the soft rocks and the weathered rocks, the gravel soil layers or the hard soil layers; and the method increases the quality reliability, reduces the consumption of various materials and improves the construction efficiency, so the method has remarkable economic benefit and social benefit.

Description

technical field [0001] The invention relates to a pile foundation construction method in foundation engineering in the field of civil engineering, in particular to a construction method and equipment for mechanical hole-forming cast-in-place piles. Background technique [0002] The standard of the Ministry of Housing and Urban-Rural Development is called the long auger bored pile, and the industry standard of the National Development and Reform Commission is called the bored pile. Output steel pipes, hoses, concrete deflectors, the inner hole of the hollow shaft of the power head, the core tube of the auger drill pipe, the drill bit seat tube and the valve installed on it, and transport the concrete to the bottom of the pile hole, and then uninterrupted while lifting the drill Pump concrete, fill the pile hole with concrete, and finally insert the reinforcement cage into the pile hole under the condition of vibration to form the pile. However, if you encounter sub-hard rock...

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Problems solved by technology

[0003] There is also a construction technique of drilling while injecting water, but a large amount of waste mud is produced. The muddy site makes construction difficult and the waste mud pollutes the environment, and the mud skin effect around the pile and the cushion effect at the pile end greatly reduce the bearing capacity of the pile.

[0004] Therefore, in sub-hard rock, soft rock and weathered rock, gravel soil layer or hard soil layer, the construction efficiency of the existing technology of vibrating and inserting reinforcement, drilling and grouting pile technology is low, the project quality is difficult to guarantee, and even the environment is damaged. Pollution

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