Multi-head minor-diameter long-spiral drilling machine and application thereof in construction of cast-in-situ major-diameter tubular pile

Abstract

The invention discloses a multi-head minor-diameter long-spiral drilling machine. The multi-head minor-diameter long-spiral drilling machine comprises a main engine, a winding engine, a spiral drill pipe module, a locating rack, a powder device and a background concrete treatment system, wherein the winding engine is positioned on a base plate; 2-6 spiral drill pipes are symmetrically fixed on the top of the locating rack to form an annulus; during once drilling, the 2-6 spiral drill pipes work at the same time; the locating rack is connected with the power device in a rotating manner, so that the angle can be changed by rotation after construction every time. The multi-head minor-diameter long-spiral drilling machine has the following advantages that the head and tail of a long-spiral drill are annularly connected to form a cast-in-situ major-diameter tubular pile, and the inner and outer walls of the cast-in-situ major-diameter tubular pile are wavy, so that the contact area of the pipe with soil is greatly enlarged, and the side friction resistance of the pile is increased; as for the cast-in-situ major-diameter tubular pile, the problems that the soil compaction effect is increased due to the increased pile thickness, construction is difficult, and the like, are overcome, site construction soil compaction has relatively little influence on the ambient environment, and the problems like pile cutting are avoided; the construction cost is reduced, the construction technology is clear, the construction speed is high, the pile forming effect is good, the bearing capacity is high, and the construction cost is low.

Description

technical field [0001] The invention belongs to the technical field of civil engineering, and in particular relates to a multi-head small-diameter long auger and its application in the construction of cast-in-place large-diameter pipe piles. Background technique [0002] The long auger pile foundation has technical advantages such as fast construction speed and strong hole penetration ability. Before the present invention, the Chinese invention patent (patent number: ZL200610085598.4) disclosed a wall-forming method of a multi-head small-diameter long auger drilled into a wall-forming machine; this invention uses two or three augers arranged side by side on the gantry pile frame Rod, the drill bit is set at the lower end, the top is connected with the positioning frame, the positioning frame is slidingly connected with the gantry pile frame, the rotating power device is installed inside the positioning frame, the auger rod is connected with the rotating power device, the mid...

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Problems solved by technology

[0004] Purpose of the invention: The purpose of the present invention is to overcome the above-mentioned defects, solve the technical problems such as the difficulty of immersed pipe construction and the significant soil squeezing effect when the wall thickness of the cast-in-place large-diameter pipe pile is large, and propose a multi-head small-diameter long auger and its Application in the construction of cast-in-place large-diameter pipe piles

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