JPH11190020A - Joint structure of pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a joint structure which can be easily assembled and which does not require local welding works and can standardize the dimensions and the precision of the joint, by arranging the protrusion and recession fitted to each other at the mutual contact face of the end plates of the upper and lower piles and oppositely arranging the protrusion and recession as the circular plate-shaped form in the same axial line with the piles. SOLUTION: Respective grooves 7a, 7b and conical base seats 8a, 8b fitted with the inner peripheral face of the inner ring. And a recession 4 and a protrusion 5 are oppositely positioned at the respective contact faces of the end plates 2 so that the inner periphery of the recession 4 is fitted to the outer periphery of the projection 5 through a gap. In this time, the recession and the protrusion are easily and accurately shaped to form circular plates provided in the coaxial line of the upper and lower piles 1 at the same time when the outer peripheries of the end plates 2 are processed on producing the end plates. The centering of the piles 1 is failitated even when the piles are welded in the construction site to impart a large equal strength against a shearing load. In this way, excellent characteristics and a high shearing strength of the joint of the piles from both inner and outer rings are imparted and hence, an excellent workability can be costlessly realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure for a support pile penetrating into the ground.

[0002]

2. Description of the Related Art Conventional joint structures for piles are generally welded joints. Such a welding connection requires a welding technician,
The work is governed by the weather, and the welding strength depends on the skill of the worker, so there is a lack of reliability.In addition, the ratio of the welding time to the pile working time is large, and the pile driving work takes a long time. is there.

In order to solve this problem, the present applicant discloses a joint structure for piles in Japanese Utility Model Laid-Open No. 5-81326. The joint structure is provided with one or several annular grooves at the ends of the piles, and has a plurality of divided cylindrical shapes having an annular ridge fitted into the annular grooves of both piles on the inner diameter and tapered on the outer diameter. The outer ring of the inner ring is externally fitted to the joint of the pile, and the outer diameter of the inner ring is externally fitted with the outer ring having the same taper on the inner surface. The structure connects the piles by tightening the inner ring.

This joint structure has a diameter of 300 to 1000 φ.
It has the advantages that it can be applied to stakes of mm, it is easy to assemble, does not require on-site welding, and it can standardize the dimensions and accuracy of the joints and easily manufacture products of constant quality. is there.

[0005]

The above-mentioned joint structure eliminates the difficulty of work due to the welded structure and enhances the reliability of the joint, and has achieved extremely good results. However, when the joint portion is required to have particularly high shear strength, a structure having a higher shear strength is desired. The present invention is applied to a joint structure of a pile having the above-described inner and outer rings, and an object of the present invention is to provide a joint structure having an improved shear strength.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a circle having a circular concave or convex ridge on the inner surface and a circular conical taper in the longitudinal direction of the pile on the outer surface to be engaged with the outer periphery of the end plate of the upper and lower piles to be connected. The present invention is applied to a joint structure of a pile comprising an inner ring divided into a plurality of circumferences and an outer ring having a conical taper on an inner surface for externally fitting to the above-mentioned conical taper and tightening the inner cylindrical ring. It is a joint structure for piles, characterized in that the mutually contacting surfaces of the plates are provided with projections and depressions that fit each other facing each other. In particular, the unevenness is preferably a circular dish-shaped unevenness coaxial with the pile.

[0007]

FIG. 2 is a sectional view showing an example of a joint to which the joint structure of the present invention is applied. Upper pile 1a to be connected
And the end plates 2a and 2b of the lower pile 1b are PC
It is integrated with concrete 4 of the pile by steel bars 3a and 3b. The end plates 2a, 2b are provided with an inner ring 10
Are locked, and an outer ring 20 for fastening the outer ring is provided. The inner ring 20 is divided into a plurality of circumferences and has a circumferential groove on the inner surface. The circumferential groove engages with the outer circumferences of the end plates 2a and 2b and draws them. This ring 10
Has a tapered surface with an outer diameter of a truncated cone.
Reference numeral 0 has an inner diameter tapered surface corresponding to the tapered surface, and tightens the inner ring 10 by moving the outer ring 20 in the axial direction. The pile joint structure usually has sufficient strength against axial tension and compression of the pile, bending and shearing of the pile. However, it may not always be sufficient for large shears.

FIG. 1 is an exploded vertical sectional view of a connection portion of a pile showing an embodiment of the present invention. The end plates 2a and 2b of the upper pile 1a and the lower pile 1b are respectively provided with grooves 7a and 7b for locking the inner peripheral surface of the inner ring 10 (see FIG. 2) and a truncated cone seat 8a.
8b, and a concave portion 4 and a convex portion 5 are provided on the surfaces where the end plates 2a and 2b are in contact with each other.
The inner periphery of the concave portion 4 and the outer periphery of the convex portion 5 are fitted to each other via a small gap. The concave portion 4 and the convex portion 5 are not limited to any shape, size, arrangement, and number as long as they have the same shape as the concave and convex portions fitted to each other. The unevenness is a circular dish-shaped unevenness provided coaxially with each of the upper pile 1a and the lower pile 1b. In this example, since the end plates 2a and 2b have a shape having an opening in the center, the circular dish is exactly a ring. Such concave portions 4 and convex portions 5 can be easily and accurately processed simultaneously with the outer peripheral processing of the end plates 2a, 2b when the end plates 2a, 2b are manufactured. Also, when the piles are connected on site, there is no directionality in the circumferential direction, the piles can be easily centered, and the piles have the same great strength against all radial shear loads.

In the case of a concrete pile having a nominal diameter of 800 mmφ, a concave part having an inner diameter of 752 mmφ and a depth of 10 mm and an outer diameter of
According to the embodiment in which the projections having a diameter of 51 mm and a height of 9 mm were provided, the shear strength of the joint portion was improved four times or more as compared with the conventional example of FIG.

[0010]

According to the present invention, the excellent characteristics of the joint of a pile comprising an inner ring and an outer ring for tightening the inner ring can be imparted to a high shear strength in combination with the excellent characteristics. Due to the synergistic effect, excellent performance can be imparted particularly to large-diameter piles, high reliability and excellent workability can be realized at low cost, and the contribution is extremely large.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a joint structure of a pile according to an embodiment.

FIG. 2 is a longitudinal sectional view of a conventional example.

[Description of Signs] 1a, 1b Pile 2a, 2b End plate 3a, 3b PC steel bar 4 Concave portion 5 Convex portion 7a, 7b Circumferential groove 8a, 8b Conical pedestal 10 Inner ring 20 Outer ring

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiromichi Sugami 3-18-16 Towa, Adachi-ku (72) Inventor Iwao Yamaguchi 1-14-16 Tennodai, Abiko-shi (72) Inventor Satoru Yamada Yoshino Omiya-shi 1-chome 400-14-14 (72) Inventor Masaaki Tada 3-14 Suehirocho, Yamagata City

Claims (2)

[Claims] 1. An inner ring having a plurality of circumferentially-divided inner rings having on the inner surface a circumferential concave or convex ridge which is engaged with the outer periphery of the end plate of the upper and lower piles to be connected, and having a conical taper in the pile longitudinal direction on the outer surface. And an outer ring having a conical taper on its inner surface for externally fitting to the conical taper and tightening the inner cylinder ring. A joint structure for piles, which is provided facing each other. 2. The pile joint structure according to claim 1, wherein the unevenness is a circular dish-shaped unevenness coaxial with the pile.