JPH09228555A - Reinforcement joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the workability and strength by forming a plurality of tapered reinforcement insert parts having tapered parts turned in mutually opposed directions on a sleeve, and pressing fastening bodies inserted to the tapered parts by lock bolts screwed to the reinforcement insert parts. SOLUTION: A reinforcement joint 1 is formed of a sleeve 3 having reinforcement insert parts having tapered parts 7 turned in mutually opposed directions and female screws 8, fastening bodies 4, and lock bolts 5. When beam main bars 6 are mutually connected, the end parts of one main reinforcement 6 and the main reinforcement 6 are inserted to the tapered parts 7, and the fastening bodies 4 are also pushed onto the tapered parts 7. The lock bolts 5 are screwed to the female screws 8 to push the fastening bodies, hooking screws 4a are bitten into the outer surfaces and knots 6a of the main bars 6 to fix the main bars 6. Each member of the joint 1 is formed by use of a metal having a tension higher than reinforcements. Thus, the connection can be facilitated, reinforcements can be firmly fixed, the joint strength can be improved, and the reinforcements can be cut to an optional length and connected.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a reinforcing bar joint.

[0002]

2. Description of the Related Art Reinforcing bar joints shown in FIGS. 10 to 12 are used in place of welding and thermocompression bonding for joining reinforcing bars used in reinforced concrete structures in construction and civil engineering.

The reinforcing bar joint 20 shown in FIG. 10 comprises a sleeve 21 made of steel and a wedge 23 press-fitted into a circular hole 22 of the sleeve 21. The wedge 23 is pressure-bonded to the inner wall thereof, and the wedge 23 bites into and joins the outer peripheral surface of the different diameter reinforcing bar 24.

The reinforcing bar joint 25 shown in FIG. 11 has a different diameter reinforcing bar 27 having a joining bolt 26 at its tip, a coupler 28 into which the joining bolt 26 is screwed, and a lock nut 29 for fixing the joining bolt 26 to the coupler 28. The joint bolts 26 are screwed into both sides of the coupler 28 and fixed with lock nuts 29.

Further, the reinforcing bar joint 30 of FIG. 12 is composed of a screw cap steel rod 31, a coupler 32, a lock nut 33 and an inorganic grout material, and the screw cap steel rod 31 is screwed from both sides of the coupler 32. While being fixed by the lock nut 33, the inorganic grout material is press-fitted into the coupler 32 through the injection hole 34.

[0006]

However, the reinforcing bar joint shown in FIG. 10 has a problem in that the dissimilar reinforcing bars are in contact only with the wedges, so that the joining becomes unstable. In addition, there is a drawback that the construction efficiency is poor because a hydraulic tool for press-fitting the wedge is required.

Further, the reinforcing bar joint of FIG. 11 has a risk that the joint bolt may be damaged during transportation and also needs a protective cap for preventing the damage. Further, since the different diameter rebars are joined by the joining bolts, they cannot be cut to an arbitrary length on site, and it is necessary to prepare beforehand different length rebars having a length corresponding to the construction site. Furthermore, the joining bolts were frictionally crimped to the reinforcing bars of different diameters, so there was concern about crimping.

Further, the reinforcing bar joint shown in FIG. 12 can be used only for a screw cap steel rod, and since it uses an inorganic grout material, there is a problem that it depends on the weather. There is also a problem in that the number of contractors is limited because only qualified personnel can press-fit the inorganic grout material.

The present invention has been made in view of the above problems, and an object thereof is to allow the joining of reinforcing bars by any number of people in the field with a simple jig, and to lengthen the reinforcing bars depending on the construction site. It is to provide a reinforcing bar joint that can be freely cut and has high strength.

[0010]

[Means for Solving the Problems] Means for solving the above-mentioned problems are as follows. A plurality of tapered reinforcing bar insertion portions are formed in a sleeve so that the tapered portions are directed in opposite directions, and the tapered portions are tightened. It means that the attachment body is inserted, and the lock bolt for pushing the fastening body is screwed into the reinforcing bar insertion portion, and a locking screw is provided on the inner surface of the fastening body, and the thread of the locking screw is rebar The lock bolt is provided so as to bite into the surface when the lock bolt is pulled, and a front side of the lock bolt is provided with a storage groove in which the end portion of the reinforcing bar is stored, and the storage groove is provided with a spring washer. A tapered pushing portion for pushing the tightening body is formed at the tip portion of the bolt, and the sleeve,
The tightening body and the lock bolt are made of a metal having a higher tensile strength than the reinforcing bar.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings. (1) of FIG. 1 is a cross-sectional view of a reinforcing bar joint in which beam main bars are joined, (2) is A- of (1).
FIG. 3 is a sectional view taken along line A.

FIG. 1 (1) shows a case in which beam main bars 6 of a reinforced concrete structure are joined together by a reinforcing bar joint 1 of the present invention, and the reinforcing bar joint 1 has a sleeve having a reinforcing bar insertion portion 2. 3, a tightening body 4 fitted in the sleeve 3, and a lock bolt 5 for pushing the tightening body 4 toward the tip side.
It is composed of

As shown in FIG. 2, on the sleeve 3, a pair of reinforcing bar insertion portions 2 each including a tapered portion 7 and a female screw 8 are formed in parallel with each other so that the tapered portions 8 face in opposite directions. The tightening body 4 is inserted.

As shown in FIG. 3, this tightening body 4 is formed into a tapered cylindrical shape by combining three wedge pieces 9, and the rear portion is bound by an O-ring 10. A locking screw 4a is provided inside the tightening body 4.

A storage groove 12 for storing the end of the beam main bar 6 is provided at the tip of the lock bolt 5, and a wrench hole 5 is provided at the rear end.
a is recessed, and a spring washer 13 is installed in the storage groove 12.

Therefore, when the lock bolt 5 is screwed into the female screw 8 of the reinforcing bar insertion portion 2 and the tightening body 4 is pushed in, the locking screw 4a is cut into the outer peripheral surface of the beam main bar 6 and the cover 6a. When the lock bolt 5 is further screwed in, the end portion of the beam main bar 6 is pressed against the spring washer 13 to integrate them.

FIG. 5 shows another lock bolt 5, in which (1) is provided with a nut 5b in place of the wrench hole 5a, and (2) is a tapered pushing portion 11 for pushing the tightening body.
Is provided, and (3) is a lock bolt 5 having no storage groove 12.

The female screw 8 of the reinforcing bar insertion portion 2 may be a parallel screw in the front half and a taper screw whose inner diameter increases in the rear half toward the rear end. A taper screw corresponding to this taper screw can be provided on the outer surface of the lock bolt 5. As a result, the lock bolt 5 can be easily screwed in and firmly fixed.

Next, referring to FIG. 6, a method of connecting the beam main bars using the reinforcing bar joint of the present invention will be described. First, as shown in (1) of the same figure, the ends of one beam main bar 6 and the other beam main bar 6 are inserted into the tapered portions 7 of the reinforcing bar insertion portion 2, and the tightening body 4 is also pushed in.

Next, when the lock bolt 5 is screwed into the reinforcing bar insertion portion 2 and the tightening body 4 is pushed in, the locking screw 4a is attached to the outer surface of the beam main bar 6 and the cover 6a, as shown in FIG. It bites and fixes the reinforcing bar 6. Further, as shown in (2) of the same drawing, the thread of the locking screw 4a is provided so as to be inclined in the direction opposite to the pulling direction, so that when the reinforcing bar 6 is pulled, it easily bites into the surface thereof. It should be noted that the inclination of the screw thread is most easily 45 ° as shown in (2). Further, since the lock bolt 5 is screwed in until the spring washer 13 is deformed, the point at which the lock bolt 5 cannot be screwed is the time when it is integrated with the main beam 6.

In the present embodiment, the case where the beam main bars 6 are connected has been described. However, this is not limited to the beam main bars 6 and the column main bars can be connected in the same manner. Plain round steel can also be connected in a similar manner.

FIGS. 8 and 9 show another embodiment of the reinforcing bar joint 1. FIG. 8 shows that the tightening body 4 is pushed in by the tapered pushing portion 11 provided at the tip of the lock bolt 5. It is a thing. Further, in FIG. 9, the locking screw 5 pushes the beam main bar 6 to cause the locking screw 4a of the tightening body 4 to bite into the outer surface of the reinforcing bar and the lid 6a.

[0023]

EFFECTS OF THE INVENTION A plurality of tapered reinforcing bar insertion portions are formed in a sleeve in directions in which tapered portions are opposite to each other. A tightening body is inserted in the tapered portions, and a lock bolt for pushing the tightening body is inserted into the reinforcing bar. Since the reinforcing bar joint screwed into the portion is configured, the different diameter reinforcing bars can be easily joined on site and the construction efficiency can be improved.

The retaining screw provided on the inner surface of the tightening body can prevent the sleeve from being displaced by being bitten into the outer peripheral surface of the reinforcing bar and the bezel, and can firmly fix the reinforcing bar.

Since the thread of the locking screw is provided so as to bite into the surface of the reinforcing bar when the reinforcing bar is pulled, the locking screw easily bites into the surface of the reinforcing bar and the reinforcing bar can be firmly fixed.

Since the lock bolt can be screwed in until the spring washer in the storage groove is deformed, it can be confirmed that the lock bolt cannot be screwed in when it is integrated with the reinforcing bar.

By pushing the tightening body with the pushing portion of the connection bolt, the locking screw can be made to bite into the outer peripheral surface of the reinforcing bar.

Even if the different-diameter reinforcing bar is broken due to the outer cylinder, the tightening body, and the connecting bolt being made of a metal having a higher tensile strength than the reinforcing bar, the reinforcing bar joint is not broken.

Since different diameter rebars can be cut according to the construction site, efficient use is possible and different diameter rebars can be connected to any length.

[Brief description of drawings]

[FIG. 1] (1) A cross-sectional view in which beam main bars are connected by a reinforcing bar joint,
(2) is a sectional view taken along line AA of (1).

FIG. 2A is a sectional view of a sleeve, and FIG. 2B is a side view of FIG.

FIG. 3 (1) is a sectional view of a fastening body formed in a tubular shape,
(2) is the same plan view, (3) is a BB line sectional view of (1).

4A is a cross-sectional view of the lock bolt, FIG. 4B is a plan view thereof, and FIG. 4C is a bottom view thereof.

5 (1) to (3) are cross-sectional views of another lock bolt,
(4) is a front view of the spring washer and (5) is a plan view of the same.

6 (1) and 6 (2) are cross-sectional views showing a method for joining reinforcing bars of different diameters.

7 (1) and 7 (2) are cross-sectional views in which the locking screw bites into the surface of the rebar having a different diameter.

FIG. 8 is a cross-sectional view showing another method of joining reinforcing bars of different diameters.

FIG. 9 is a cross-sectional view showing another method for joining reinforcing bars of different diameters.

10 (1) is a cross-sectional view of a conventional reinforcing bar joint, and FIG. 10 (2) is the same cross-sectional view.

FIG. 11 is a cross-sectional view of a conventional reinforcing bar joint.

FIG. 12 is a cross-sectional view of a conventional reinforcing bar joint.

[Explanation of symbols]

 1, 20, 25, 30 Reinforcing bar joint 2 Reinforcing bar insertion part 3 Sleeve 4 Tightening body 5 Lock bolt 6 Beam main bar 7 Tapered point 8 Female screw 9 Wedge piece 10 O-ring 11 Pushing part 12 Storage groove 13 Spring washer

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] June 24, 1996

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Fig. 4

[Correction method] Change

[Correction contents]

4A is a sectional view of a lock bolt, FIG. 4B is a plan view thereof, FIG. 4C is a bottom view thereof, FIG. 4B is a front view of a spring washer, and FIG.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] Fig. 5

[Correction method] Change

[Correction contents]

5 (1) to (3) are cross-sectional views of other lock bolts.

Claims (6)

[Claims] 1. A plurality of tapered reinforcing bar insertion portions are formed on a sleeve so that the tapered portions are opposed to each other, a tightening body is inserted into the tapered portions, and a lock bolt for pushing the tightening body is inserted into the reinforcing bar. Reinforcing bar joint screwed into the part. 2. The reinforcing bar joint according to claim 1, wherein a retaining screw is provided on an inner surface of the tightening body. 3. The reinforcing bar joint according to claim 2, wherein the thread of the retaining screw is provided so as to bite into the surface of the reinforcing bar when the reinforcing bar is pulled. 4. A storage groove for accommodating an end portion of a reinforcing bar is provided in a front surface of the lock bolt, and a spring washer is provided in the storage groove.
Or the rebar joint according to 2. 5. The reinforcing bar joint according to claim 1, wherein a tapered pushing portion for pushing the tightening body is formed at a tip portion of the lock bolt. 6. The reinforcing bar joint according to claim 1, wherein the sleeve, the tightening body, and the lock bolt are made of a metal having a higher tensile strength than a reinforcing bar. .