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    • 6. 发明专利
    • CAST-IN-PLACE CONCRETE PILE AND CONSTRUCTION METHOD THEREOF
    • JPH09111758A
    • 1997-04-28
    • JP26856095
    • 1995-10-17
    • KAJIMA CORP
    • HANAMURA MASAHIKONOJIRI AKIYOSHIKASE YOSHIYAHAYASHI HIDEOFUKUSHIMA MASATAKA
    • E02D5/34E02D5/58
    • PROBLEM TO BE SOLVED: To make it possible to construct a tension member easily and definitely by providing a dia-expanded area on a concrete pile whose head is exposed and excavating a boring hole and fixing a fixture grip at the tip of the tension member with the dia-expanded area. SOLUTION: A pile reinforcing bar 2 is placed into an excavation hole 1 where concrete 3 is cast only in an area which is the foundation of an underground skeleton. An evacuated area in the upper part is backfilled. After that, underground excavation is executed down to the foundation surface, thereby exposing the head of a pile 4 and constructing the pile 4. Then, a boring hole 5, which is opened in the upper end of the pile 4 and forms a dia-expanded area 5a at the lower part, is bored in the longitudinal direction of the pile 4. A tension member 6, on which a thick plate-like fixture grip 7 is mounted at the tip, is inserted into the boring hole 5 where a grout material is injected in the dia-expanded area and a primary grout filling work is executed. After the tension member 6 is strained, secondary grout filling work is further executed. At that time, the fixture rip 6 is fixed with the size expansion area so that it may act as a support member of tensile force, thereby introducing the tensile force to the pile 4 by way of the grout material.