Optimal-friction-resistance cast-in-place pile type and construction method therefor

Abstract

The invention provides an optimal-friction-resistance cast-in-place pile type and a construction method therefor. The pile type comprises an engineering truck having an autocrane and a hydraulic pile expander, as well as a hydraulic pile-expander digital display system, and is characterized in that the hydraulic pile expander of the engineering truck is horizontally arranged and fixed between a cab and a crane-operating room, and pile-expanding cones of the on-vehicle pile expander are in hydraulic multi-cylinder synchronization. The optimal-friction-resistance cast-in-place pile type manufactured by the pile expander is characterized in that a plurality of groups of convex rectangular force-bearing cones in radial symmetry are arranged on a cylindrical pile body, perpendicularly intersect at an axis, and are staggered and distributed in the axial direction of the pile body. The construction method for cast-in-place piles comprises the following steps that: a plurality of pile-expanding cones in the pile expander simultaneously start to apply transverse extrusion force to a soil layer around a borehole; the previous operation is repeated till all force-bearing cone holes of borehole-extruding pile expansion are finished; and the engineering truck retracts and places the pile expander horizontally in a truck body and carries the pile expander to next hole position. The invention has the advantages that the invention increases the surface area of the pile body with the same specifications by 45 to 50 percent, and can obtain the economic benefit of saving 40 to 45 percent of materials and saving 30 percent of investment on the premise of guaranteeing the same degree of single-pile bearing capacity.

Description

technical field [0001] The invention relates to construction engineering, the field of engineering machinery for bridge pile foundations, cast-in-place pile types and construction methods. Background technique [0002] At present, the preferred pile type in the construction of my country's construction projects, highway bridge projects, railway bridge projects, port terminals and large oil storage depots is still the technology of bored concrete pouring piles, because this type of pile has high single pile bearing capacity and stable design technology. Reliable, simple construction technology, construction method can adopt dry hole-forming operation method and mud retaining wall underwater pouring method. The characteristics of the cast-in-situ pile body are: a cylindrical pile body, relying on the friction force of the pile body and the end-bearing force of the pile end to generate the bearing capacity of a single pile, but this type of pile has a lot of consumables, high en...

AI Technical Summary

Problems solved by technology

For piles above 600mm in high-rise projects in the city, if the construction technology of extruded and expanded cast-in-situ piles and multi-branched piles is used, the overall project cost of construction enterprises will increase and the profit margin of construction enterprises will decrease.

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