Double-pipeline drill bit for cast-in-place stiffening core composite pile

Abstract

The invention relates to a double-pipeline drill bit for a cast-in-place stiffening core composite pile. The double-pipeline drill bit comprises an opening / closing blade, a core pile molding protective drum, a cutting blade and a hollow drill pipe, wherein the opening / closing blade is hinged to the bottom end of the hollow drill pipe, and is controlled to be opened or closed through a magnet; the core pile molding protective drum is arranged at the bottom of the hollow drill pipe, and is slidingly connected with the hollow drill pipe through a dowel pin; a cutting blade cutting soil body is arranged at the outer side of the core pile molding protective drum, and provides acting force for vertical sliding of the protective drum; the cutting blade is arranged outside the hollow drill pipe; double pipelines are arranged in the hollow drill pipe; a cement slurry nozzle is arranged at the bottom of the hollow drill pipe; the lower end of a cement slurry pipeline is communicated with the cement slurry nozzle, and the upper end is externally connected with a pumping device for injecting cement slurry; and the lower end of a hollow part of the hollow drill pipe is communicated with the opening / closing blade, and the upper end is connected with the pumping device for filling concrete. The drill bit can be applied to a conventional cement mixing pile machine to omit the pile machine customization cost, realizes once molding of the cast-in-place stiffening core composite pile to simplify the pile forming process, and guarantees the coaxiality of a peripheral pile and a core pile to achieve reliable pile forming quality.

Description

technical field [0001] The invention relates to a double-pipeline drill bit for a cast-in-situ composite pile with strong core, and belongs to the field of geotechnical engineering foundation treatment construction machinery. Background technique [0002] The cement-soil mixing pile has low construction cost and simple construction technology, but its bearing capacity is low and the post-construction settlement is large, so its application is limited to a large extent. At present, in order to solve this problem in China, cored composite piles or composite piles have been invented. According to different core pile materials, there are many types of cored composite piles or composite piles, but there are many concepts that can be used in practice. There are very few mechanical equipments; mechanical equipment with reasonable cost, good soft soil foundation reinforcement effect, wide applicability and simple construction technology is even rarer, and various cored composite pil...

AI Technical Summary

Problems solved by technology

Although this kind of drill bit realizes the construction of cement-soil peripheral piles, a piling device must be added when constructing core piles, which increases the equipment cost and the construction process is complicated; The cores are consistent, and the quality of piles is low; the core piles used in this method and equipment are drive-in types, which have high requirements for the strength of core piles. Most of the strength of core piles has not been fully and effectively utilized in composite piles, and the cost of core pile materials is very high High, which increases the cost of construction materials in addition to construction machinery

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