Double-casing-pipe double-drive full-rotation type pile forming device and technology

Abstract

The invention discloses a double-casing-pipe double-drive full-rotation type pile forming device. A double-casing-pipe double-drive full-rotation drilling machine, an upper clamp sheet, a lower clampsheet, an outer casing pipe, an inner casing pipe and a steel bar cage are included. The lower clamp sheet and the outer casing pipe are connected together, the outer casing pipe can be downwards pressed to penetrate through a refilling layer through forward rotation, and the outer casing pipe can be pulled out of the refilling layer through reverse rotation. The upper clamp sheet and the inner casing pipe are connected together, the inner casing pipe can be downwards pressed to penetrate through strong weathered rock and a karst cave to enter a bearing stratum moderately-weathered limestone layer through forward rotation, and the inner casing pipe can be pulled out through reverse rotation. The steel bar cage is arranged at the middle positions of the outer casing pipe and the inner casing pipe, a concrete guide pipe is arranged at the middle position of the steel bar cage and can be lowered and hoisted along the center position of the steel bar cage, and a funnel is fixedly connectedto the upper end of the concrete guide pipe. By means of the double-casing-pipe double-drive full-rotation type pile forming device, the ultra-long pile construction depth can be achieved, the hole forming efficiency can be greatly improved, the hole forming depth can reach 120 m, and the problems that in deep refilling layer karst development areas and other complex stratums, the pile length islimited, and the pile forming efficiency is too low are solved.

Description

technical field [0001] The invention relates to the technical field of concrete pouring pile construction, in particular to a double-sleeve double-drive full-rotation pile-forming device and a pile-forming process. Background technique [0002] In many types of pile foundation construction, the commonly used construction methods of cast-in-situ pile foundation are auger drilling method, submersible drilling method, percussion drilling method, positive and negative circulation rotation method, punching drilling method, etc.; In many karst landform areas, mountainous and hilly areas, the upper layer of the building and structure site is a deep backfill layer, the thickness of the backfill is relatively thick, and the lower layer of karst caves and karst crevices are relatively developed, with a wide distribution range and depth; the existing pile foundation construction technology construction exceeds 60m For the pile foundation above, the efficiency of pile formation is extre...

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Problems solved by technology

[0004] In order to overcome the technical defects in the prior art, the present invention provides a double-casing, double-drive full-rotation pile-forming device and pile-forming process, which can meet the construction depth of super-long piles, and can greatly improve the hole-forming efficiency. The depth can reach 120m, which solves the problems of limited pile length and low pile formation efficiency in the deep backfill karst development area during construction

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