Slipform blade and method for applying pre-compression strain to cast-in-place concrete on well walls

Abstract

The invention discloses a slipform blade foot and method for applying pre-compression strain to cast-in-place concrete of a shaft wall. The slipform blade foot is an annular structure, comprising a plurality of blade foot block structures connected end to end, each blade foot block structure comprising: a blade foot block body, a vertical displacement generating device, a displacement sensor and a limit plate, the vertical displacement generating device is arranged between a lower plate and an arc plate, and is used to drive the displacement of the arc plate in a vertical direction; the displacement sensor is arranged on the telescopic end of the vertical displacement generating device; the limit plate is an I-shaped structure, and is used to limit the maximum displacement distance of the arc plate. The invention is suitable for a shaft wall constructed by a top-down, short-digging and short-laying process, and can quickly and accurately apply pre-compression strain to the cast-in-place concrete of the shaft wall by applying upward displacement to the arc plate to extrude the cast-in-place concrete, thereby improving the compactness of the cast-in-place concrete in the shaft wall section and the joint cast-in-place concrete, and significantly improving the overall water-sealing performance of the shaft wall.