Dry-method rotary extruding and expanding pile forming device and construction method

Abstract

The invention discloses a dry-method rotary extruding and expanding pile forming device and a construction method thereof. The dry-method rotary extruding and expanding pile forming device comprises a walking type and crawler type main machine, a winch, a cab computer, a guide rod, a steel wire rope, a drilling speed controller, a feeding port, a rotary extruding and expanding drill rod, a rotary extruding and expanding drill bit, a discharging port, a concrete sensing device, a self-soil-taking device, a pump truck guide pipe and a concrete pump truck; the construction method is characterized in that a dry-method rotary extruding and expanding pile is built through the rotary compaction expanding pile forming device to form intermittent expanding of a pile bottom and a pile body, and the specific construction comprises the steps of drilling for hole forming, expanding of the pile bottom, concrete pouring, expanding of the pile body and the like. Compared with the prior art, in a soft soil area drilling process, an original pile body soil body is completely compacted into a pile hole peripheral soil body through the drill bit and the drill rod, hole forming unearthing is reduced, the stability of a pile hole peripheral hole wall is enhanced, the bearing capacity of the pile body is increased, the concrete filling coefficient is reduced, the construction cost is reduced, the construction efficiency of the cast-in-place pile in a soft soil area is improved, and investment and coordination of machinery, personnel and materials are reduced.

Description

technical field [0001] The invention relates to a pile-forming device and a construction method, which are mainly used in the construction of cast-in-place piles in soft soil layers. Background technique [0002] At present, cast-in-place piles are generally used for the enclosure structure of the foundation pits of one-story and two-story basements in coastal areas, and cast-in-place piles are generally used for super high-rise buildings. [0003] For the surrounding cast-in-place piles and cast-in-place pile foundations in soft soil areas, positive circulation or reverse circulation mud protection wall forming techniques such as pump suction and air lift are generally used. However, the construction technology of mud retaining wall piles is very low in single-machine construction efficiency, and a large amount of construction mud needs to be disposed of, which does not conform to the current green concept; for projects with narrow construction sites, restricted mud vehicle...

AI Technical Summary

Problems solved by technology

However, the construction technology of mud retaining wall piles is very low in single-machine construction efficiency, and a large amount of construction mud needs to be processed, which is not in line with the current green concept; for projects with narrow construction sites, restricted mud vehicles, and tight construction schedules, it is often used. The situation that the duration of the node cannot be guaranteed

[0004] Moreover, in some unfavorable geology such as silty soil layers and sandy soils, the diameter expansion and shrinkage of the mud retaining wall piles often occur, and the filling coefficient of the concrete during construction remains high, resulting in waste of construction costs.

[0005] The conventional method of increasing the bearing capacity and pullout resistance of cast-in-situ piles is to increase the pile length and pile diameter, and gradually expand the pile bottom diameter to increase the force under the condition that the pile length remains unchanged, but the simple pile bottom diameter increases The force is limited

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