Double pile casing construction method for controlling perpendicularity

Abstract

The invention relates to the technical field of cast-in-place pile construction and discloses a double pile casing construction method for controlling the perpendicularity. The double pile casing construction method comprises the following construction steps of (1) measuring and locating a pile position on situ, and arranging four crossed locating points; (2) vertically submerging an outer pile casing within an encirclement ring formed by the four locating points; and (3) respectively convexly arranging a locating plate on a position, aligning to each locating point, on the inner wall of the outer pile casing; and vertically submerging an inner pile casing in the outer pile casing, and respectively enabling the outer ends of the four locating plates to support against the outer surface of the inner pile casing. The outer pile casing and the inner pile casing simultaneously act, so that the frictional resistances of the outer pile casing and the inner pile casing in the submerging and withdrawing processes are reduced; the inner pile casing and the outer pile casing can be utilized repeatedly, so that the construction cost is reduced; the inner pile casing is limited and located by using the four locating plates to ensure that the central point of the inner pile casing is coincided with the central point of a pile hole, so that the inner pile casing is accurately located, and the pile forming quality is effectively ensured.

Description

technical field [0001] The invention relates to the technical field of cast-in-situ pile construction, in particular to a double-casing construction method for controlling verticality. Background technique [0002] With the advancement of my country's urbanization process, the demand for construction of ports, highways and bridges in coastal areas is increasing day by day. The foundation of this type of engineering usually adopts large-diameter, ultra-deep (greater than 40m) bored piles, and for coastal areas, this type of engineering usually encounters soft fill, flow (soft) plastic silt soil, sandy soil, etc. , pebble layer and other unfavorable formations, in order to avoid hole wall collapse and diameter shrinkage when drilling into the hole, and ensure the quality of the pile, in the prior art, the hole-forming method of large-diameter bored pile construction usually uses vibration The hammer is lowered into the deep and long casing for construction. However, during th...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a double casing construction method for controlling the verticality, aiming at solvi

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