Adhesion preventing method and support body extracting method

摘要

To prevent adhesion of a support body and a hardened body of a hydraulic composition, the hydraulic composition being used for a soil structure such as a retaining wall built in a soil excavating work in the civil engineering and construction fields, a composition (A) composed of at least an alkaline-water-soluble resin with an acid value of not less than 15 mgKOH/g and a water-absorbent material is provided so as to intervene between the support body and the hardened body of the hydraulic composition, either by applying the composition (A) on a surface of the support body, or by covering the support body with a sheet-like member on which the composition (A) is applied. The alkaline-water-soluble resin dissolves in alkaline water upon contact with the same contained in the hydraulic composition. As the alkaline-water-soluble resin dissolves, the water-absorbent material swells absorbing the alkaline water, whereby a layer of the water-absorbent material which has swollen is formed between the hardened body of the hydraulic composition and the support body, preventing the adhesion therebetween.