| 摘要 |
PURPOSE:To increase proof stress of bending moment of a pile, by a method wherein, after a cable made of specified flexible reinforcing bars is formed in a cage which is disposed along the inner surface of a steel pipe, a steel pipe is filled with expansive concrete produced by addition of specified cement and an expansive material. CONSTITUTION:The ground is excavated and a steel pipe 3 is driven. Cable 2, formed by flexible reinforcing bars 1 having yield strength of 60-120kgf/mm.<2> or by bundling a plurality of such reinforcing bars, are formed in a cage which is disposed along the inner surface of the steel pipe 3. The interior of the steel pipe 3 is filled with expansive concrete or mortar prepared by mixture of 1-20wt.pt. each, based on 100wt.pt. cement, of two different cement expansive materials respectively having a blaine ratio surface area of 5,000cm<2>/g or more and 1,500- 4,000cm<2>/g. This improves adhesion of the steel pipe 3 to the reinforcing bar 1, resulting in the possibility to increase proof stress of bending moment of a pile. |
