JP2000291002A5 - - Google Patents

Claims (6)

The steel pipe pile with the tip open and the outer periphery of the tip projecting screw blades and the steel pipe pile inserted into the steel pipe pile, the excavation head protruding from the tip of the steel pipe pile rotate in opposite directions, While excavating the ground with the excavation head of the excavation rod, the steel pipe pile and the excavation rod are advanced, and when the excavation head reaches the construction start position of the root consolidation part, the steel pipe pile and the excavation rod are kept rotating and the A method for constructing synthetic piles that discharges or ejects caustic drilling fluid, builds up the soil cement root in the section of the steel pipe pile that includes the screw blades, and fixes the steel pipe pile in the root. It is a steel pipe pile used by the construction method of Claim 1, Comprising: The steel pipe pile which the front-end | tip opened | released and the screw blade | wing was protrudingly provided by the outer periphery of the front-end | tip part. The tip is open, screw blades are projected on the outer periphery of the tip, the lower end of the screw blades protrudes downward from the tip of the steel pipe body, and the steel pipe pile is inserted into the steel pipe pile. The drilling rods protruding from the tip are rotated in opposite directions, and the steel pipe pile and the drilling rod are advanced while excavating the ground with the drilling head of the drilling rod and the screw blades of the steel pipe pile. When the pipe reaches the pipe pile and the drilling rod, the solidified drilling fluid is discharged or spouted from the drilling head, and the soil cement rooting part is built in the section including the screw blades of the steel pipe pile. And a method of constructing a synthetic pile in which a steel pipe pile is fixed in the rooting part. A steel pipe pile used in the construction method according to claim 3, wherein the tip is open, screw blades project from the outer periphery of the tip, and the lower end of the screw blade protrudes downward from the tip of the steel pipe body. . The synthetic pile comprised from the steel pipe pile of Claim 2 or Claim 4, and the soil cement rooting part constructed | assembled in the area containing the screw blade of the steel pipe pile in an embedment state. The synthetic pile construction method according to claim 1, wherein a spiral screw is formed on an outer periphery of the excavation rod .