JP2001107356A5 - - Google Patents

Claims (11)

A different-diameter combined pile composed of a ready-made pile and a hollow outer tube having an inner diameter larger than the outer diameter of the ready-made pile, a length shorter than the total length of the ready-made pile, and arranged around the head of the ready-made pile. The different-diameter combined pile according to claim 1, wherein concrete is filled between the periphery of the head of the ready-made pile and the inner periphery of the outer pipe. The different-diameter combined pile according to claim 2, wherein a connecting material for joining the outer pipe and the foundation is disposed in the concrete. The different-diameter combined pile according to claim 2, wherein a connecting material for joining the outer tube and the foundation is disposed on a head portion of the outer tube. The different-diameter combined pile according to any one of claims 1 to 4, wherein an enlarged bottom portion having a diameter equivalent to the inner diameter of the outer pipe is formed at a tip portion of the ready-made pile. 6. The different diameter combination pile according to claim 5, wherein the expanded bottom portion is formed of soil cement. The different-diameter combined pile according to claim 5 or 6, wherein a screw blade projects from an outer periphery of a tip portion of the ready-made pile. After inserting a hollow outer tube whose inner diameter is larger than the outer diameter of the prefabricated pile and whose length is shorter than the total length of the prefabricated pile into the ground at the installation position of the prefabricated pile, it is inserted into the prefabricated pile with the open end, Rotate the drilling rod protruding from the tip of the ready-made pile, drill the ground with the drilling head of the drilling rod through the outer pipe, advance the ready-made pile and the drilling rod, and when the drilling head reaches a certain depth, from the drilling head A construction method for different-diameter combined piles that discharges or ejects cement-based consolidated material and constructs an expanded bottom at least at the tip of the ready-made pile. After inserting a hollow outer tube whose inner diameter is larger than the outer diameter of the pre-made pile and whose length is shorter than the total length of the pre-made pile into the ground at the installation position of the pre-made pile, rotate the excavation rod with the excavation head connected to the tip, The excavation rod is advanced while excavating the ground with the excavation head of the excavation rod through the outer pipe, and when the excavation head reaches a certain depth, cement-based consolidated material is discharged or ejected from the excavation head, at least ready-made piles A construction method for different-diameter combined piles, in which a bottom expansion part is constructed at the tip of the burial position, and then inserted into the ground where the ready-made piles are excavated until reaching the bottom expansion part. The laminated rubber bearing or the sliding bearing is disposed on the top of the ready-made pile, and a cushioning material is disposed between the lower end of the outer pipe and the ready-made pile. Combined piles with different diameters. The different diameter combination pile according to any one of claims 2 to 7, wherein a stopper is joined to the outer peripheral surface of the ready-made pile and the inner peripheral surface of the outer pipe.