JPS6338287Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a cylindrical pile made of concrete, steel, ceramic, or ceramic coated with a pit suitable for digging at the tip.

When constructing a structure on soil that cannot be directly supported, the general method used is to support the structure by driving concrete or steel ready-made or on-site piles up to a stratum that can support the weight of the structure. If the possible soil layer is too shallow to effectively demonstrate the performance of the pile, the surface layer is an embankment, or the ground layer is subject to significant consolidation deformation, or it is impossible to construct an on-site construction pit inside an existing building. There are cases where it is desired to have strength greater than the bearing capacity of a deep foundation (load bearing capacity of the ground).

This invention was devised in view of the above circumstances, and will be explained below based on the illustrated embodiments.

1 shows a pile of this invention. This pile 1 is formed into a cylindrical shape, and has a spiral groove 2 on its outer circumferential surface.
is provided. In order to join the joint pile 1a, a convex cotter 3 is provided on the upper circumferential edge, and a concave groove 4 into which the cotter 3 is fitted is provided on the lower circumferential side edge of the joint pile 1a. Further, at the lower end of the pile 1, a plurality of wing pieces 5 are provided projecting from the inner circumferential surface thereof at a predetermined angle and inclined in the same direction to form a pit.

As shown in FIG. 3, the pile 1 may have spiral protrusions 6 not only on the outer peripheral surface but also on the inner peripheral surface, and as shown in FIG. A book groove 7 may be provided.

In use, this pile 1 is driven into the ground by screwing, but in this case, the pit portion at the lower end rotates, and the soil enters the hollow of the pile 1 through this pit.

This invention consists of the above-mentioned structure, and since the wing pieces are protruded from the inner circumferential surface of the lower end to form a pit, the rotation of the pit causes the soil to enter the hollow during pouring, so that pouring can be carried out smoothly. be able to.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention; Fig. 1 is a partially exploded perspective view, Fig. 2 is a bottom view, and Fig. 3 is a partially exploded perspective view.
4 are perspective views showing other embodiments. 1... Pile, 2... Spiral groove, 3... Cotter, 4... Concave groove, 5... Wing piece, 6... Spiral projection, 7... Concave groove.

Claims (1)

[Scope of utility model registration request] At least a concave groove continuous in the longitudinal direction is provided on the outer circumferential surface of the pile, and a plurality of wing pieces projecting from the inner circumferential surface at a required angle and inclined in the same direction are provided on the lower end of the pile to form a bit. , consisting of a pile with a convex cotter on the upper circumferential edge of the pile, and a joint pile with a concave groove on the lower circumferential edge that engages with the cotter, and is driven into the ground by screwing. A cylindrical pile characterized by: