Triaxial triangular cement mixing drill stem and construction method

Abstract

The invention relates to a triaxial triangular cement mixing drill stem and a construction method. The triaxial triangular cement mixing drill stem is used for forming of triangular pile foundations of cement mixing piles. The triaxial drill stem is in triangular distribution, and heads of three drill stem bodies of the triaxial drill stem are connected with a power output end respectively. The triaxial triangular cement mixing drill stem has the advantages that drilling holes of the triaxial drill stem in triangular distribution form three triangular quincuncial pile holes in mutual communication and a triangular quincuncial pile, and corner support is formed between a three-petal-shaped pile foundation and a three-petal-shaped pile body of the three-petal-shaped columnar triangular quincuncial pile, so that stability of the pile foundation is improved while contact area of a soil layer and the three-petal-shaped triangular pile body is greatly widened, bearing capability of the cement mixing pile is improved while stability of the pile body is enhanced; simultaneous drilling of the three drill stem bodies of the triaxial drill stem is realized while combined alternative drilling, sequentially alternative drilling or staggered drilling of the three drill stem bodies of the triaxial drill stem according to geological conditions is realized, and rock penetration or rock bursting is achieved.

Description

technical field [0001] The invention relates to a triaxial triangular cement mixing drill pipe used for forming a cement mixing pile triangular pile foundation and a construction method, belonging to the field of cement mixing pile drill pipe manufacturing. Background technique [0002] CN102535450A, name "a five-axis cement-soil mixing pile device and construction method", the device includes a main engine, a hoist, a guide rod, a steel wire rope, a slurry inlet, a power head, a gearbox, a reducer, a drill pipe, an intermediate support frame, Lower support frame, winged drill pipe, hoop, spray port, background cement slurry mixing system, the hoist and guide rod are fixed on the main engine, the power head is connected to the pulley at the top of the guide rod through a wire rope, and the wire rope drives the power The head is lifted up and down, and the power head is connected to five drill pipes through the gearbox and reducer in turn. The middle part of the five drill pi...

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Problems solved by technology

The construction method includes the following steps: (1) stake out, release the actual sample according to the construction drawing; (2) open the groove, open the groove according to the drawing requirements; (3) put the device in place, move the five-axis cement-soil mixing pile device to The position to be constructed; (4) Start the background cement slurry mixing system, and then send the cement slurry to the slurry storage tank; (5) Turn on the integrated computer and let the computer control the preset data: the descending speed per meter, the amount of grout sprayed per meter , pile end design elevation, total spraying amount and total mixing time; (6) Turn on the power head to drive the multi-functional drill bit to spray cement while stirring, sink to the design pile bottom elevation when turning forward, and lift the drill while spraying in the reverse direction to the length of the winged drill pipe, and then turn forward while spraying grout and drill down to the design elevation; its disadvantages: first, because the five drill pipes are arranged in a straight line, the formed cement mixing piles are arranged in a straight line, The cement piles arranged in a line have supporting force between the horizontal pile and the pile, but there is no supporting force in the vertical direction. Not only the anti-tilt ability is poor, especially in the soft soil area, but also the ability to resist inclination is poor in the pile foundation. In the later excavation construction, it is very easy to cause a large inclination and lodging of the pile, which in turn causes the toppling of the building and endangers people's lives. rock breaking drilling

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