Jetting, expansion and extrusion combined pile, construction method thereof and spiral jetting, expansion and extrusion drilling rig used in method

Abstract

The invention discloses a jetting, expansion and extrusion combined pile, a construction method thereof and a spiral jetting, expansion and extrusion drilling rig used in the method. A pile of the combined pile comprises a pile body, at least one expanded body and a pile end, and the at least one double-frustum-shaped expanded body integrally formed with the pile body is arranged on the pile body.Each expanded body is located in a vertical soil layer position, which has higher deformation modulus and shear strength, of the pile body, and at least two wing plates which are uniformly distributed in the circumference direction and basically perpendicular to the axis of the pile are arranged on the pile body. The diameter of the pile above the at least one expanded body is larger than or equal to that of the pile below the at least one expanded body. The drilling rig comprises an upper section and a lower section, the diameter of the upper section is larger than that of the lower section,and the at least one expanded body can be produced in any required position conveniently. When the at least one expanded body is located at the upper part or in the middle of the combined pile, if the diameter of the pile above the at least one expanded body is larger than that of the pile below the at least one expanded body, the consumption of concrete can be greatly reduced.

Description

technical field [0001] The present invention generally relates to concrete piles, and in particular relates to an on-site pouring concrete pile, a construction method and a drilling rig. Background technique [0002] At present, with the adjustment and development of the construction industry, construction projects have higher and higher requirements for foundation design and construction. Therefore, concrete piles are more and more widely used in construction projects such as high-rise buildings, bridges, high-speed rail, and ports. [0003] In order to make the pile foundation meet the requirements of anti-deformation, anti-seismic and architectural design of bearing capacity, methods such as lengthening the pile and increasing the diameter of the pile body are often used to increase the bearing capacity. However, lengthening or enlarging the pile body will lead to an increase in the amount of concrete, especially when the ratio of the length and diameter of the pile body ...

AI Technical Summary

Problems solved by technology

[0006] However, since the diameter-expanding body is located at the extreme end of the pile body, that is, at the pile end, the scope of application of the combined pile is greatly limited.

Under complex geological conditions, such as when the bearing layer with high shear strength is located at a shallow depth, and the diameter expansion body of the composite pile is located at the pile end, the bearing capacity of the single pile cannot meet the design requirements

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