JPH04122111U - clip fittings - Google Patents

Abstract

(57) [Summary] [Purpose] To eliminate the slippage of reinforcing bars that occurs when tensile force is applied to the reinforcing bar joints in clip joints, and to eliminate the strong stress concentration at the parts of the reinforcing bars that contact the joint corners at this time. Mitigating what happens. [Structure] An uneven group 5 is provided on the inner surface of the corner wall 2 of the joint. Furthermore, a diagonally cut edge is provided on the opening edge of the joint. [Effect] By installing the uneven structure, the engagement between the reinforcing bars and the inner surface of the corner wall is improved, eliminating the possibility of the reinforcing bars slipping out. Furthermore, the above-mentioned stress concentration can be greatly alleviated by providing the edging portion.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a clip joint, which is a type of reinforcing bar joint.

0002

[Conventional technology]

Clip joints, which are a type of reinforcing bar joints, are described in Publication of Utility Model Publication No. 57-7686, etc. It is well known and in practical use. As shown in Figure 3, this product has a roughly elliptical cross-sectional shape. A corner wall 2 consisting of a circular metal cylinder with openings at both ends, the side surfaces of which face each other in the longitudinal direction of the cross section. and flat walls 3 facing each other in the cross-sectional minor axis direction, and each flat wall 3 has a wedge at an opposing position. It has a structure in which holes 4 are provided. Insert reinforcing bar 7 into this in the opposite direction and make a joint. between the polymerized reinforcing bars so that the wedge 8 passes from one wedge hole to the other. Press fit into the gap. Each inserted reinforcing bar 7 is pressed against the inner surface of the corner wall in which it is housed. The reinforcing bars are then clipped and fixed inside the joint, where the pair of reinforcing bars are joined.

0003

[Problem that the idea aims to solve]

Conventional clip joints have the following characteristics regarding their behavior when tensile force is applied to the joining reinforcing bars: There is a problem.

0004 The first problem is that the reinforcing bar slips out of the joint at a tensile force that is considerably lower than the nominal strength of the reinforcing bar. This is a phenomenon that emerges from This so-called sliding deformation of the joint is favorable for evaluating the performance of the joint. This is a phenomenon that does not exist.

[0005] The second problem is the phenomenon in which stress concentration occurs in reinforcing bars. Joined as shown in Figure 4 When a tensile force is applied to the reinforcing bar 7, a couple is generated with the wedge 8 as the fulcrum, causing a click. A force is applied to rotate the joint 1. Therefore, the joint 1 is connected to the tensile direction axis of the joint reinforcing bar 7. The reinforcing bar 7 strongly contacts the opening edge of the corner wall 2 that it is in contact with, and the reinforcing bar 7 A large stress concentration occurs at this contact area. Furthermore, when the reinforcing bars begin to slide, this contact The contact area is scraped by the edge of the corner wall opening, resulting in a cross-sectional loss of the reinforcing bar. This makes the connection Rebar breaks at tensile forces significantly lower than its nominal strength.

[0006]

[Means to solve the problem]

The present invention is aimed at solving the above-mentioned problems, and is aimed at solving the above-mentioned first problem. A first device that solved the problem and a second device that also solved the second problem above. It becomes more.

[0007] The first clip joint of the present invention is shown in FIG. 1, which shows an example thereof. , consisting of a metal cylinder with an approximately elliptical cross-section open at both ends, whose side walls are opposite corner walls. 2 and a flat wall 3 facing each other, each of which has wedge holes 4 at opposing positions. In the clip joint 1 that is This is a clip joint characterized by providing a group of protrusions and recesses 5.

[0008] The corner wall 2 has a semicircular shape that is large enough to accommodate the inserted reinforcing bar in contact with it. Or, it is a convex wall with a shape similar to this, and is opposed in the major axis direction of the cross section. Also, flat wall Reference numeral 3 denotes a flat or nearly flat convex wall, which faces each other in the minor axis direction of the cross section.

[0009] The unevenness group 5 is provided essentially over the entire length of the corner wall in the axial direction of the joint, and around the corner wall. In the opposite direction, it is provided over the entire circumference range or a part of the circumference range. The unevenness group 5 has various For example, a sawtooth shape in which the direction of the peaks and valleys is perpendicular to the joint axis is provided. These include those with a group of conical protrusions arranged in a row.

0010 Note that Figure 1(a) is a longitudinal cross-sectional view of the joint, and the dotted lines indicate wedge holes and unevenness. The groups are serrated. Figure (b) is a cross-sectional view taken along the XX plane. The reinforcing steel joints are joined in the same way as conventional clip joints.

[0011] The clip joint of the second invention in this invention is shown in FIG. 2 showing its embodiment. , abuts at least the reinforcing bars around the opening edges at both ends of the clip joint 1 of the first invention. A rim 6 is cut out diagonally from the inside of the joint to the outside on the edge of the side corner wall 2. This is a clip joint characterized by being provided with.

0012 The shape of the cutout surface of the edging portion 6 may be a flat surface, or a smooth surface slightly convex upward. It may be a surface. The area where this is provided around the opening edge covers the entire circumference. Alternatively, it may be only the peripheral part of the corner wall on the side where the inserted reinforcing bar comes into contact. Note that it is preferable to provide a padding for reinforcement on the outside of the cutout portion of the opening.

[0013] FIG. 2 is a longitudinal cross-sectional view of this joint 1, and the edging portion 6 extends over the entire circumference of the opening at both ends. It is set up as follows. The rest is the same as in FIG. 1.

[0014]

[Effect]

The unevenness group in this invention improves the engagement between the reinforcing bar and the inner surface of the corner wall that is pressed against it. This has the effect of suppressing the sliding of reinforcing bars.

[0015] The edging part in this invention makes contact with the reinforcing bar in a plane, so it is The degree of stress concentration exerted on the striations is greatly reduced compared to the case of conventional joints. (Traditional In joints, this contact was made by a line, so stress concentration was large. )

[0016]

[Effect of the idea]

The clip joint of the first design solves the first problem mentioned above, that is, by installing a concave and convex group, Eliminates the phenomenon of the reinforcing bars slipping out of the joint when tensile force is applied to the reinforcing bars. child This advantage is noticeable when deformed reinforcing bars are used as reinforcing bars.

[0017] The clip joint of the second design has the above-mentioned characteristics because it has an edging part in addition to the concave-convex group. The second problem is that large stress concentration occurs on the reinforcing bars, and the reinforcing bars are shaved and cross-sectional The phenomenon of defects occurring is greatly alleviated.

[Brief explanation of drawings]

FIG. 1 is a diagram illustrating a clip joint of a first invention.
Figure (a) is a longitudinal cross-sectional view, and figure (b) is a cross-sectional view cut along the XX plane.

FIG. 2 is a longitudinal cross-sectional view illustrating a clip joint of the second invention.

FIG. 3 is a diagram showing a state in which reinforcing bars are joined using a conventional clip joint. Figure (a) is a front view. However, illustration of the wedge is omitted. Figure (b) is an enlarged cross-sectional view cut along the XX plane.

FIG. 4 is a state diagram when tensile force is applied to reinforcing bars joined by a clip joint.

[Drawing code]

1 Clip fitting 2 corner wall 3 Flat wall 4 Wedge hole 5 Irregularity group 6 Border 7 Rebar 8 wedge

Claims (2)

[Scope of utility model registration request] [Claim 1] Consisting of a metal cylindrical body with an approximately elliptical cross-sectional shape and open ends at both ends, the side walls of which are comprised of opposing corner walls and opposing flat walls, each of which is provided with wedge holes at opposing positions. A clip joint characterized in that a group of concave and convex portions are provided on the inner surfaces of opposing corner walls along the joint axis direction. [Claim 2] A clip joint is characterized in that a rim portion cut out diagonally from the inside of the joint to the outside is provided on the periphery of both openings of the clip joint, at least on the periphery of the corner wall on the side that contacts the reinforcing bar. The clip joint according to claim 1, wherein