JPS629013A - Steel bar coupler - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a steel bar coupler for joining steel bars.

Conventional technology When joining two members made of reinforced concrete, for example, it is necessary to join both the steel rod (so-called reinforcing bar) buried in the concrete and the concrete in order to ensure sufficient strength at the joint. In conventional joining methods, concrete is joined by cast-in-place concrete, and steel bars are joined by overlapping, lap welding, pressure welding, couplers and mortar, couplers and adhesives, etc.

Problems to be Solved by the Invention However, although there are no problems in joining concrete with the above conventional method, there are problems in joining steel bars, such as difficulty in on-site construction and weak joint strength. There was a problem. In particular, in the case of PC steel bars that require high joint strength, there is a problem in terms of strength, and if both steel bars are thick and are not in a straight line but at an angle to each other, There were problems with both construction and strength.

An object of the present invention is to provide a steel bar coupler that solves the above problems.

Means for solving the problem In order to solve the above problem, the steel bar coupler of the present invention has the following features:
A joining nut is screwed into one of the two male threads carved on the joining side ends of two steel bars to be joined together, and an annular projection is formed on one end of the inner peripheral surface of the other male thread. A cylindrical joining attachment is loosely fitted, and two nuts, an inner and an outer one, are screwed in between the annular protrusion, and the joining side end surfaces of the joining nut and the joining attachment face each other, and either of the joining side A ring-shaped welding material is fixed to the end face, and a cover is fitted to the outer peripheral surface so as to enclose the welding material.

Function To join steel bars in the above configuration, first loosen the joining nut of one steel bar and the inner nut of the other steel bar, feed the joining attachment to the joining nut side by the outer nut, and join the joining attachment. The welding material is clamped between the end faces of the nut on the rejoining side. At that time, a slight gap is left between the annular protrusion of the joining attachment and the steel rod so that the joining attachment can be inclined with respect to the steel rod. next,
Attach electrodes to the joining attachment and joining nut, apply welding current, and weld the joint end faces of both liquids. At this time, the cover prevents the molten welding material from flowing out. After welding, when the joint nut integrated with the joint attachment is tightened, the annular protrusion comes into contact with the inner nut, drawing both steel bars together and applying a suitable tensile force. Finally, the outer nut is tightened to fix the annular protrusion between it and the inner nut, completing the connection.

EXAMPLE Hereinafter, an example of the present invention will be described based on FIGS. 1 to 8.

In the steel rod coupler 1 of this embodiment, a joining nut 6 is attached to one of the male threads 4 of two male threads 4.5 carved in the joining side ends of the two steel bars 2 and 8 to be joined to each other. screwed,
A hollow cylindrical joining attachment is loosely fitted into the other male thread 5, and an inner nut 9 and an outer nut 10 are screwed together by sandwiching an annular projection 8 formed at one end of the inner peripheral surface of the joining attachment 7. An annular washer 11 having a circular cross section is interposed between the inner nut 9 and the annular projection 8. The joint nut 6 is a rod-shaped body having a female thread 12 carved in the center thereof to be screwed into the male thread 4, and a joint-side end surface 13 faces a joint-side end surface 14 of the joint attachment 7. An annular welding material 15 is fixed to the joining side end surface 14 of the joining attachment 7, and a short tubular cover 16 is fitted to the outer peripheral surface of the joining attachment 7 so as to enclose the welding material 15 therein. A conical surface 1 is provided on the surface of the annular projection 8 that faces the inner nut 9.
7 is formed.

Hereinafter, the operation of the above structure will be explained in the case where two reinforced concrete panel members 21, 22 formed between three steel frames 18, 19, 20 shown in FIG. 4 are joined. First, before pouring the concrete 28 for the panel, two steel bars 2 and 8 to be reinforcing bars are placed in the steel frame 18.
, 19.20, and the steel rod coupler 1 is attached to the joining side end of both the steel rods 2 and 8 as shown in FIG.

Next, as shown in FIG. 2, connect the connecting nut 6 and inner nut 9.
is loosened, the welding attachment 7 is sent out to the welding nut 6 side by the outer nut 10, and the welding material 16 is clamped between the end faces 18 and 14 on the rejoining side. At that time, a slight gap is left between the annular projection 8 and the washer 11 so that the joining attachment 7 can be inclined with respect to the steel rod 8 (not shown). Next, two electrodes 24 and 25 are attached to the joint nut 6 and the joint attachment 7, and welding current is applied to weld the rejoining side end faces 13 and 14. At this time, the cover 16 prevents the molten welding material 15 from flowing out.

After welding, when the joint nut 6 integrated with the joint attachment 7 is tightened, the annular protrusion 8 comes into contact with the inner nut 9 via the washer 11, drawing both steel bars 2 and 8 together and applying an appropriate tensile force. do. Next, as shown in FIG. 8, the outer nut 10 is tightened to fix the annular protrusion 8 between it and the inner nut 9, completing the joining of both steel bars 2 and 3. Finally, as shown in FIG. 4, panel concrete 28 is cast using the steel bars 2 and 8 as reinforcing bars, and joint concrete 26 is cast at the boundaries between the two panel members 21 and 22 formed as a result. , the joining of both panel members 21 and 22 is completed.

In addition, even if both steel bars 2 and 8 are not supported in a straight line and are inclined to each other initially, and even if both steel bars 2 and 3 are thick and the inclination cannot be corrected, the annular protrusion 7 and the washer can be used as described above. Since there is a slight gap between the washer 11 and the conical surface 17, the joining attachment 7 is inclined with respect to the steel rod 8, and the joining nut 6
Therefore, both steel bars 2 and 8 can be joined without any problem.

The above coupler (1) is also used to connect panels made by integrating panel concrete (2) and steel rods (3).
) can be used.

Effects of the Invention As described above, according to the present invention, the entire circumference of a steel bar can be reliably welded with one touch even in a narrow place where reinforcing bars are intricate, such as the joint of reinforced concrete members, and the steel bar has a large cross-sectional area. Since the joint is made using a joint nut and a joint attachment, the joint strength is extremely high, and since tensile force can be applied to the steel rod, prestress can be introduced into the concrete using the PC steel rod, and the steel rods to be joined can be tilted to each other. It has many advantages, such as being able to join easily and reliably even when

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view of a steel bar coupler showing an embodiment of the present invention, FIGS. 2 and 8 are partial sectional views showing the operation of the present invention, and FIG. 4 is a partial sectional view of a steel bar coupler showing an embodiment of the present invention. It is a partial sectional view showing an example.

Claims (1)

[Claims] 1. A joining nut is screwed into one of the two male threads carved on the joining side ends of the two steel bars to be joined together,
A cylindrical joining attachment having an annular projection formed at one end of the inner circumferential surface is loosely fitted into the other male thread, and two nuts, an inner and an outer one, are screwed onto the annular projection, and the joining nut and The joining side end surfaces of the joining attachment face each other, an annular welding material is fixed to one of the joining side end surfaces, and a cover is fitted to the outer peripheral surface so as to enclose the welding material. steel bar coupler.