JPH0551738B2 - - Google Patents

Description

[Detailed Description of the Invention] Conventionally, when connecting two threaded reinforcing bars (hereinafter simply referred to as reinforcing bars), a coupler and a lock nut are used, and the connecting ends of the two reinforcing bars are attached to both sides of the coupler. After each coupler is screwed in, the locking nuts screwed onto both reinforcing bars are rotated and a high torque is applied to the locking nuts, thereby eliminating play between the coupler and the reinforcing bars and ensuring the rigidity of the joint. Therefore, there is a problem with the workability of attaching the lock nut, and the cost is increased because the lock nut is expensive.

By the way, when the connecting ends of two reinforcing bars are screwed into both sides of the coupler and butted against each other, if the reinforcing bars are not cut at right angles to their axes, generally both reinforcing bars will come to a point. came into contact,
Sometimes surface contact occurs and the abutting state is not uniform, and on the other hand, the cut surface of the reinforcing bar has unevenness, the degree of rust, etc. Therefore, if you rotate the reinforcing bars and apply a high torque to them to make both reinforcing bars butt against each other to eliminate looseness between the reinforcing bars and the coupler, and then connect the two reinforcing bars with only the coupler, the friction between the butting parts of both reinforcing bars will increase. Resistance becomes uneven and stable joint performance cannot be obtained.

On the other hand, it is difficult to finish the connection side end surfaces of both reinforcing bars into a uniform state by machining or the like, which is disadvantageous in terms of cost.

In order to eliminate the above-mentioned defects, the present invention provides temporary fixing clips 6 protruding from both sides of the back surface of the convex ball washer 4 at the connection side end of one of the threaded reinforcing bars 1 and 2 to be connected. and temporarily fasten the convex ball washer 4,
At the connection side end of the other threaded reinforcing bar 2, a concave spherical washer is fitted by fitting between the temporary fixing clips 7 protruding from both sides of the back surface of the concave spherical washer 5 which is joined to the protrusion of the convex spherical washer 4. Temporarily fasten the convex ball washer 4 to the coupler 3 from the 1 side.
After screwing the threaded reinforcing bar 1 with the threaded reinforcing bar 1 and the threaded reinforcing bar 2 with the concave ball washer 5 from the other side and abutting them, applying a high torque to the threaded reinforcing bars 1 and 2, the coupling between the coupler 3 and the threaded reinforcing bars 1 and 2 is achieved. This invention relates to a threaded reinforcing bar connecting device characterized in that the rigidity of the joint is ensured by eliminating backlash.

To explain the structure of one embodiment of the present invention shown in the drawings, 1 and 2 are threaded reinforcing bars that connect to each other, 3 is a coupler, and a is a spacer made of the same material as the reinforcing bars 1 and 2, which is approximately placed on the pedestal. Consists of a convex spherical washer 4 provided with a hemispherical protrusion, and a concave spherical washer 5 provided with a spherical concave portion that joins the hemispherical protrusion of the convex spherical washer 4, and the convex spherical washer 4 and the concave spherical washer 4. Temporary fixing clips 6 and 7 are provided protruding from both sides of the back surface of 5, respectively.

Next, its effect will be explained. Temporarily fasten the convex ball washer 4 by fitting the sandwiching pieces 6 on both sides of the convex ball washer 4 to the connecting end of the reinforcing bar 1, and then perform the same operation to attach the reinforcing bar 2.
The concave spherical washer 5 is temporarily fixed by fitting between the pinching pieces 7 on both sides of the concave spherical washer 5 to the connection side end of the concave spherical washer 5.

Therefore, the reinforcing bar 1 with the convex spherical washer 4 is screwed into the coupler 3 from one side, and the reinforcing bar 2 with the concave spherical washer 5 is screwed into the coupler 3 from the other side. After abutting, when a high torque is applied to the reinforcing bars 1 and the coupler 3, or the reinforcing bars 2 and the coupler 3, or the reinforcing bars 1 and 2, the hemispherical protrusion of the convex ball washer 4 and the concave The spherical concave portions of the spherical washers 5 press against each other, and the convex spherical washers 4 and the concave spherical washers 5 of the spacer a are automatically and appropriately adjusted according to the conditions such as the cutting angle and surface roughness of the cut surfaces of the reinforcing bars 1 and 2. Convex spherical washer 4 so that the back surface of
The reinforcing bar 1, the convex spherical washer 4, the concave spherical washer 5, and the reinforcing bar 2 are always in surface contact with each other and are stable. Thus, the reinforcing bars 1 and 2 can be connected by the coupler 3 while ensuring the required rigidity of the joint.

The screw reinforcing bar connection device of the present invention has the following advantages.

(1) Since it is only necessary to temporarily fasten washers to the connecting ends of the double-threaded reinforcing bars to be connected and screw them into the coupler, the cost is reduced as there is no need to use expensive locking nuts as in the past, and the construction process is simplified. It is easy and useful in practice.

(2) Temporarily fasten a convex ball washer to the connection end of one threaded reinforcing bar, temporarily fasten a concave ball washer to the connection end of the other threaded reinforcing bar, and connect the threaded reinforcing bar with the convex ball washer to the concave ball washer. Since the threaded reinforcing bar with a ball washer is screwed into the coupler and a high torque is applied, (a) the spherical protrusion of the convex ball washer and the spherical concave part of the concave ball washer press against each other, and their contact area is wide, so that the convex ball washer and the concave ball washer Stable frictional resistance can be obtained between the ball washers.

(b) Depending on the condition of the cut surface, such as the cutting angle of the double-threaded reinforcing bar, the surface roughness of the cut surface, and the degree of rust, the convex ball washer and concave ball washer are automatically adjusted so that their back surfaces are the cut surface of the threaded reinforcing bar. The convex spherical washer and the concave spherical washer slide along the spherical abutting parts of the concave spherical washer to operate, and the double-threaded reinforcing bar, convex spherical washer, and concave spherical washer are constantly in pressure contact with each other in surface contact, and everything in between Stable frictional resistance can be obtained, the required rigidity of the joint can be ensured, and both threaded reinforcing bars can be reliably and firmly connected by the coupler.

(c) The convex spherical washer and the concave spherical washer slide on their spherical contact portions and operate easily and smoothly.

(3) Convex ball washers and concave ball washers are temporarily fastened by fitting the temporary fastening clips protruding on both sides of their back surfaces to the connecting end of the threaded reinforcing bar. It is easy to attach the ball washer to the threaded reinforcing bar.

(4) Since the convex ball washer and the concave ball washer are temporarily secured to the threaded reinforcing bar, and the threaded reinforcing bar with the convex ball washer and the threaded reinforcing bar with the concave ball washer are screwed into the coupler, (a) screwing the double threaded reinforcing bar is easy. It is.

(b) The convex ball washer and the concave ball washer do not fall off from the threaded reinforcing bar during the connection work of the double threaded reinforcing bar.
To improve work efficiency by easily and reliably connecting double-threaded reinforcing bars.

(5) It has an extremely simple structure and can be manufactured easily and inexpensively.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view of a connecting portion of threaded reinforcing bars showing one embodiment of the present invention, Fig. 2 is a front view of a convex spherical washer of the spacer, Fig. 3 is a side view, and Fig. 4 is a side view of the same spacer. FIG. 5 is a front view of the concave ball washer, and FIG. 5 is a side view. a... Spacer, 1, 2... Screw reinforcing bar, 3...
...Coupler, 4...Convex ball washer, 5...Concave ball washer,
6, 7...Pinch piece for temporary fixing.

Claims (1)

[Claims] 1 Temporarily fasten the convex ball washer by fitting between the temporary fastening clips protruding from both sides of the back side of the convex ball washer to the connection side end of one of the threaded reinforcing bars to be connected, At the connecting end of the other threaded reinforcing bar, temporarily fasten the concave ball washer by fitting between the temporary fastening clips protruding from both sides of the back side of the concave ball washer to be joined to the protrusion of the convex ball washer. The screw reinforcing bar with a convex ball washer is screwed into the coupler from one side and the threaded reinforcing bar with a concave ball washer is screwed into the coupler from the other side, and then a high torque is applied to both the threaded reinforcing bars. Connection device for threaded reinforcing bars.