Pile machine equipment of large-diameter rotary jetting pile and construction method

Abstract

The invention discloses pile machine equipment of a large-diameter rotary jetting pile. The pile machine equipment comprises a base, a tower, a drill rod, a power head, a power frame and a winch arranged on the base; the power head is arranged in the power frame, and the power frame is connected with the winch through a steel wire rope; the upper end of the drill rod penetrates through the power frame to be fixedly connected with the power head; a detachable drilling structure is arranged at the lower end of the drill rod and comprises a drill bit and a plurality of blades, the drill bit and the drill rod are arranged coaxially, and the blades are each in a long strip shape and are arranged perpendicular to the drill bit; and the drilling structure further comprises a plurality of rotary jetting inlets formed in the upper end of the drill bit and used for being connected with grouting pipes, and a plurality of rotary jetting outlets corresponding to the rotary jetting inlets in number,the rotary jetting outlets are formed in the lower bottom faces of the blades, and the rotary jetting outlets communicate with the corresponding rotary jetting inlets. The invention further disclosesa construction method of the large-diameter rotary jetting pile, and the construction method comprises the following steps that a main machine current value Iz is read; and the main machine current value Iz is compared with a set range, and V2 is regulated. The pile machine equipment is high in drilling capability, good in pile forming quality and high in strength.

Description

technical field [0001] The invention belongs to the technical field of building foundation engineering construction, and in particular relates to pile driver equipment and a construction method for large-diameter rotary grouting piles. Background technique [0002] At present, the mixing pile is widely used in the field of foundation pit support and foundation reinforcement. The principle is to use the mixing pile machine to force the cement and soil to be mixed in the deep soil layer, and to use the physical and chemical interaction between the soil and cement hydrate. Form a cement-soil consolidation body with a certain strength, thereby improving the strength, water permeability, bearing capacity and other characteristics of the soil. When the existing mixing pile driver generally adopts single-pipe or double-pipe grouting for construction, there are mainly the following problems: [0003] (1) The existing construction technology of the mixing pile machine cannot effecti...

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Problems solved by technology

[0003] (1) The existing construction technology of the mixing pile machine cannot effectively mix the cement into the soil and fully mix it with the silt or cohesive soil, so that the quality of the piles in the silt and cohesive soil is poor, the pile strength is low, the uniformity is poor, and the discreteness Large, for example, the strength of the pile body in the silt layer is often only 0.4-0.6MPa, and the poorer silt may only be 0.2MPa or 0.3MPa or even the pile cannot be formed;

[0004] (2) In better cohesive soil and denser sandy soil, the mixing pile driver may not be able to drill;

[0005] (3) The maximum construction pile diameter is only 1.2m, and the construction pile diameter is small. When the foundation pit is deep, it can only be used as a water stop

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