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JP-2026074617-A - Pile foundation

JP2026074617AJP 2026074617 AJP2026074617 AJP 2026074617AJP-2026074617-A

Abstract

[Problem] To provide a pile foundation that has higher bearing capacity while also being easy to construct. [Solution] A pile foundation 1 that supports a structure 4 by the bearing force of a plurality of piles 5, comprising a cylindrical main body part 2 that fixes the shaft portion 41 of the structure 4 in the axial direction, and a plurality of leg parts 3 provided separately from the main body part 2, wherein a plurality of first protrusions 22 projecting radially outward are formed on the outer circumferential surface of the main body part 2, and each of the plurality of leg parts 3 includes a cylindrical portion 31 into which the piles 5 are inserted, and a second protrusion 32 that projects radially outward from the outer circumferential surface of the cylindrical portion 31, the end of which is connected to the first protrusions 22 by a connector, the pile foundation 1. [Selection Diagram] Figure 1

Inventors

  • 島谷 学

Assignees

  • 株式会社ラスコジャパン

Dates

Publication Date
20260507
Application Date
20241021

Claims (4)

  1. A pile foundation that supports a structure by the bearing capacity of multiple piles, A cylindrical main body part that fixes the shaft portion of the aforementioned structure in the axial direction, Multiple leg parts are provided separately from the main body part, Equipped with, Multiple first protrusions projecting radially outward are formed on the outer circumferential surface of the main body part. Multiple of the aforementioned leg parts are, The cylindrical portion into which the aforementioned pile is inserted, A second protrusion extends radially outward from the outer surface of the cylindrical portion, and its end is connected to the first protrusion by a connector, Pile foundations, each including the respective elements.
  2. In the state where the second protrusion is connected to the first protrusion, the length from the cylindrical portion to the central axis of the main body part is 300 mm or more. The pile foundation according to claim 1.
  3. The cylindrical portion, when the second protrusion is connected to the first protrusion, is inclined at an angle of 20 degrees or more and 45 degrees or less radially outward with respect to the axial direction of the main body part. The pile foundation according to claim 2.
  4. Each of the aforementioned main body parts and the multiple aforementioned leg parts weighs less than 55 kg. In the state where the second protrusion is connected to the first protrusion, the pile foundation weighs 55 kg or more. A pile foundation according to any one of claims 1 to 3.

Description

This disclosure relates to pile foundations. When erecting columnar members such as lighting poles in the ground, a technique using pile foundations is known. For example, Patent Document 1 discloses a simple foundation for fixing a support column to the ground. The simple foundation of Patent Document 1 comprises a foundation body and six driven pins. The foundation body includes a hollow cylindrical fixing part and six leg parts, each having a cylindrical body into which these pins can be inserted. During installation, the installer places the foundation body on the ground, inserts pins into each of the multiple legs, and drives these pins into the ground using an electric hammer or similar tool. These legs are arranged radially on the outer surface of the fixing part, sloping downwards. By driving the pins along this direction, the foundation body is fixed to the ground while restricting its horizontal and vertical movement. Afterward, the lower end of the lighting pole is secured to the plate of the foundation body with bolts. Japanese Patent Publication No. 2011-241590 This is a schematic diagram illustrating the overall configuration of the pile foundation according to the embodiment.This is a perspective view of the pile foundation and multiple piles, seen from an oblique angle above.This is a plan view of the pile foundation.This is a cross-sectional view taken along the IV-IV cutting line in Figure 3.This is a side view of the main body part.These are plan and cross-sectional views of the leg parts.This is a diagram illustrating the construction procedure for pile foundations.These are a plan view and a side view of the leg part related to a modified example.This is a perspective view of the modified pile foundation and multiple piles, seen from an oblique angle above.These are a plan view and a side view of the leg part related to a modified example.This diagram illustrates the differences between the pile foundation according to the embodiment and the pile foundation according to a modified example. <Summary of Embodiments in This Disclosure> The embodiments of this disclosure are outlined below. (1) The pile foundation of this disclosure is a pile foundation that supports a structure by the bearing capacity of a plurality of piles, comprising: a cylindrical main body part that fixes the shaft portion of the structure in the axial direction; and a plurality of leg parts provided separately from the main body part, wherein the outer circumferential surface of the main body part has a plurality of first protrusions projecting radially outward, and each of the plurality of leg parts includes a cylindrical portion into which the piles are inserted, and a second protrusion projecting radially outward from the outer circumferential surface of the cylindrical portion, the end of which is connected to the first protrusion by a connector, respectively. In the pile foundation described herein, the main body part and multiple leg parts are provided as separate components, allowing the weight of each individual part to be made light enough to be carried manually. This improves construction efficiency, even when the leg parts are made larger to create a pile foundation with higher bearing capacity. (2) In the pile foundation described in (1) above, when the second protrusion is connected to the first protrusion, the length from the cylindrical portion to the central axis of the main body part may be 300 mm or more. By using a relatively long length, the piles can be driven over a wider area, thereby increasing the bending strength of the pile foundation. This results in a pile foundation with higher bearing capacity. (3) In the pile foundation described in (2) above, the cylindrical portion may be inclined at an angle of 20 degrees or more and 45 degrees or less radially outward of the main body part with respect to the axial direction of the main body part, when the second protrusion is connected to the first protrusion. By setting the angle to a relatively large angle of 20 degrees or more, the radial bearing capacity can be made particularly strong. On the other hand, if the angle exceeds 45 degrees, the pile may succumb to axial loads. Therefore, to adequately accommodate both radial and axial loads, the angle should be set between 20 and 45 degrees. This allows for higher bearing capacity in the pile foundation. (4) In any of the pile foundations described in (1) to (3) above, the main body part and the multiple leg parts each weigh less than 55 kg, and the pile foundation may weigh 55 kg or more when the second protrusion is connected to the first protrusion. When the total weight of a pile foundation exceeds 55 kg, it becomes difficult for one worker to carry it manually. In contrast, the pile foundation in this disclosure has separate main body and leg parts, and since each part weighs less than 55 kg, one worker can carry them. This allows for easier construction of the pile foundation with fewer per