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A platform for research: civil engineering, architecture and urbanism
Back taper step-shaped pile, preparation method thereof and drilling tool
The invention provides a back taper step-shaped pile, a preparation method of the back taper step-shaped pile and a drilling tool. The drilling tool comprises a hollow drill rod, a drill bit arranged at the lower end of the hollow drill rod and a soil-retaining drilling tool body coaxial with the hollow drill rod. The drilling tool further comprises a hydraulic scrape boring bar arranged on the hollow drill rod, wherein the hydraulic scrape boring bar comprises a hydraulic oil pump, a hydraulic contracting and stretching scraper and a hydraulic oil pipe; the hydraulic oil pump supplies conveying power to the hydraulic contracting and stretching scraper through the hydraulic oil pipe. The back taper step-shaped pile is composed of at least two back taper step-shaped bodies and at least two back taper step-shaped extension bodies. According to the back taper step-shaped pile, the preparation method of the back taper step-shaped pile and the drilling tool, the bearing capacity of the back taper step-shaped pile contains the pile periphery frictional force and the pile tip resistance of a traditional pile body; moreover, downward bevels of the back taper step-shaped bodies convert part of vertically downward force into tangential force and normal force, pile periphery soil forms passively pressed stress in an extruded and expanded state, the pile periphery frictional force developing coefficient is increased, the bearing capacity of a single pile is improved comprehensively, and the settling volume is lowered.
Back taper step-shaped pile, preparation method thereof and drilling tool
The invention provides a back taper step-shaped pile, a preparation method of the back taper step-shaped pile and a drilling tool. The drilling tool comprises a hollow drill rod, a drill bit arranged at the lower end of the hollow drill rod and a soil-retaining drilling tool body coaxial with the hollow drill rod. The drilling tool further comprises a hydraulic scrape boring bar arranged on the hollow drill rod, wherein the hydraulic scrape boring bar comprises a hydraulic oil pump, a hydraulic contracting and stretching scraper and a hydraulic oil pipe; the hydraulic oil pump supplies conveying power to the hydraulic contracting and stretching scraper through the hydraulic oil pipe. The back taper step-shaped pile is composed of at least two back taper step-shaped bodies and at least two back taper step-shaped extension bodies. According to the back taper step-shaped pile, the preparation method of the back taper step-shaped pile and the drilling tool, the bearing capacity of the back taper step-shaped pile contains the pile periphery frictional force and the pile tip resistance of a traditional pile body; moreover, downward bevels of the back taper step-shaped bodies convert part of vertically downward force into tangential force and normal force, pile periphery soil forms passively pressed stress in an extruded and expanded state, the pile periphery frictional force developing coefficient is increased, the bearing capacity of a single pile is improved comprehensively, and the settling volume is lowered.
Back taper step-shaped pile, preparation method thereof and drilling tool
JIA QIANWEI (author)
2015-04-22
Patent
Electronic Resource
English
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