CONSTRUCTION METHOD OF SUPPORT PILE

• Main Authors: TAUCHI HIROAKI, NAKAMURA SHOGO, KITAMURA MORIO
• Format: Patent
• Language: English; Japanese
• Published: 06.12.2018
• Subjects: EMBANKMENTS; EXCAVATIONS; FIXED CONSTRUCTIONS; FOUNDATIONS; HYDRAULIC ENGINEERING; SOIL SHIFTING; UNDERGROUND OR UNDERWATER STRUCTURES

To increase pile strength and withdrawal resistance with simple construction.SOLUTION: A construction method of a support pile 1 includes: a steel pipe installing step of installing a steel pipe; an excavating step of excavating an inside of the steel pipe while installing or after installing the steel pipe; a concave forming step of expanding an inner wall of the steel pipe to form a concave portion 17a on an inner surface; a solidifying material filling step of filling concrete C in a range including the concave portion 17a in the steel pipe; and a pressurizing step of pressurizing the filled concrete C. In the pressurizing step, as a pressurizing device 19, a lid portion 20 installed in the supporting pile 1 is pressed by a press-fitting machine 3 through an inner pipe 21 to pressurize the concrete C, and forms an enlarged diameter bulb having a larger diameter than the steel pipe of the support pile 1 at a lower end portion of the support pile 1.SELECTED DRAWING: Figure 5 【課題】簡単な施工で杭強度と引き抜き抵抗を増大できる。【解決手段】支持杭１の施工方法は、鋼管を打設する鋼管打設工程と、鋼管を打設しながらまたは打設した後に鋼管内を掘削する掘削工程と、鋼管の内壁を拡径して内面に凹部１７ａを形成する凹部形成工程と、鋼管内の凹部１７ａを含む範囲にコンクリートＣを充填する固化材料充填工程と、充填したコンクリートＣを加圧する加圧工程とを備えた。加圧工程において、加圧装置１９として、圧入機３によって内管２１を介して支持杭１内に設置した蓋部２０を押圧してコンクリートＣを加圧し、支持杭１の下端部に支持杭１の鋼管より径の大きい拡径球根を形成した。【選択図】図５