JPH10317585A - Connecting device for screw reinforcement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connecting device for screw reinforcements capable of high connection strength by simple work. SOLUTION: A joint 10 is provided with a screw hole 11 and a driving hole 12. With a pair of screw reinforcements 1 screwed into the screw hole 11 of the joint 10, a wedge member 20 is driven from the driving hole 12 to the top end of the screw reinforcements 1. By this, the screw reinforcements 1 are pushed in the direction apart from each other, and a connection strength is increased. Also grout material is poured from a filling port 21 formed in the wedge member 20 so as to further increase the connection strength. In addition, a flange 21 is formed on the wedge member 20 and an elastic seal ring 30 is provided between the flange 21 and the flat outer surface of the joint 10 so as to prevent grout material from leaking.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting device for a screw rebar which can ensure a high connecting strength.

[0002]

2. Description of the Related Art A technique is known in which a threaded rebar is used as a deformed rebar and an end of the threaded rebar is screwed into a long nut-shaped joint to efficiently connect the rebars. The connection strength is low only by screwing the threaded rebar into the joint as described above. Therefore, lock nuts are screwed onto both threaded rebars, and these lock nuts are tightened toward both ends of the joint to increase the connection strength. However, the method using the lock nut requires a jig for tightening the lock nut with a large torque,
The tightening work is also complicated.

On the other hand, as disclosed in Japanese Utility Model Application Laid-Open No. 62-61815, a driving hole is formed at the axially central portion of the peripheral wall of the joint, and the leading end of a threaded screw threaded from the driving hole. A method of driving a wedge member between them has also been developed. Since high connection strength cannot be obtained only by driving with the wedge member, a lock nut is also used in the same manner as described above.

[0004]

In the method disclosed in the above publication, a lock nut is used as an auxiliary, and the tightening torque is smaller than when the connection strength is increased by using only the lock nut. Again, the work of tightening using a large jig is complicated.

[0005]

According to a first aspect of the present invention, there is provided an apparatus for connecting a pair of threaded rebars by screwing ends of a pair of threaded rebars into a joint having a threaded hole. In the peripheral wall of the joint, a driving hole is formed substantially at the center in the axial direction, and the wedge member is driven between the distal ends of the screw threads in the screwed state through the driving hole. In addition, an injection hole for injecting the grout material is formed in the wedge member.

According to a second aspect of the present invention, there is provided an apparatus for connecting threaded rebars by screwing ends of a pair of threaded rebars to a joint having a threaded hole, further comprising a wedge member. A driving hole is formed in the peripheral wall at substantially the center in the axial direction, and the wedge member is driven between the distal ends of the screw threads in the threaded state through the driving hole. An injection hole for injecting the grout material is formed in the peripheral wall at a position substantially at the center in the axial direction and separated from the driving hole in the circumferential direction.

According to a third aspect of the present invention, in the connecting device for a screw rebar according to the first or second aspect, a flange larger than the driving hole is formed at a base end of the wedge member. And According to a fourth aspect of the present invention, in the connecting device for a threaded reinforcing bar according to the third aspect, an annular elastic seal ring is interposed between the flange and an outer surface of the joint. The invention of claim 5 is the invention of claim 3
In the coupling device for a screw reinforcing bar described in the above, the outer surface of the joint is formed with a recess larger than the drive hole so as to surround the drive hole, and the recess of the joint is accommodated in the recess. And According to a sixth aspect of the present invention, in the coupling device for a screw rebar according to any one of the third to fifth aspects, a cross-sectional outline of a central portion of the joint has a polygonal shape, and the outer surface of the joint has a flat surface. It is characterized in that a driving hole is formed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A connecting device for a screw rebar according to a first embodiment of the present invention will be described below with reference to FIG.
The coupling device has a joint 10. The joint 10 has a long nut shape (cylindrical shape) with a hexagonal cross section in outer shape, and has a screw hole 11 for screwing the screw reinforcing bar 1 on an inner periphery. In the peripheral wall of the joint 10, a circular driving hole 12 penetrating the peripheral wall is formed at the center in the axial direction. The driving hole 12 is formed in one of the six flat surfaces 10a on the outer peripheral surface of the joint 10, and has a diameter smaller than the circumferential width of the flat surface 10a. The distance D from the periphery of the driving hole 12 to both ends 10b of the joint 10 is equal. This distance D corresponds to the minimum required screwing depth of the screw reinforcing bar 1.

The connecting device of this embodiment further includes a wedge member 20 and a rubber O-ring 30 (elastic seal ring).
And is equipped with. The wedge member 20 has a tapered shape, and the outer peripheral surface has a conical surface. The wedge member 20 has an injection hole 21 penetrating in the axial direction. A circular flange 22 is formed at the base end of the wedge member 20. The diameter of the flange 22 is larger than the diameter of the driving hole 12.

In the above configuration, when connecting a pair of threaded reinforcing bars 1, first, the joint 10 is screwed to one threaded reinforcing bar 1 over the entire length, and the other threaded reinforcing bar 1 is arranged on the same straight line. At the same time, the screw rebars 1 are brought close to each other. In this state, the joint 10 is turned and a part thereof is screwed to the other threaded reinforcing bar 1. Note that the joint 10 may be screwed to the joint 10 by turning the other screw reinforcing bar 1 in a state where the joint 10 is partially screwed to the one screw reinforcing bar 1.

As shown in FIG. 1 (A), after screwing a pair of threaded reinforcing bars 1 to a joint 10, it is determined whether or not the tips of both threaded reinforcing bars 1 can be seen through a driving hole 12 of the joint 10. Confirm. If it can be seen, both screw rebars 1 are screwed to the joint 10 with the required screwing depth D secured. In the present embodiment, in order to obtain the effect of driving the wedge member 20 described later, the tip of the screw reinforcing bar 1 needs to protrude from the periphery of the driving hole 12. It is preferable that the protrusion amount L of the distal end of the double-threaded reinforcing bar 1 be a predetermined amount or a predetermined range and be substantially equal. In order to obtain the predetermined protrusion amount L, the joint 10 is turned or the threaded rebar 1 is turned to adjust the screwing depth.

After confirming the protrusion amount L of the threaded reinforcing bar 1 as described above, as shown in FIG. And hit it with a hammer or the like. Then, the two screw rebars 1 are pushed in a direction away from each other, and the outer surface of the thread 2 (the right surface for the right screw 1 and the left surface for the left screw 1). But, it strongly hits the inner peripheral surface of the screw hole 21 of the joint 20. Thereby, the connection strength between the joint 20 and the screw reinforcing bar 1 can be increased.

When the wedge member 20 is driven, there is a gap between the flange 21 and the flat surface 10a of the joint 10.
The O-ring 30 is interposed, and the space between the two is sealed by the elastic deformation of the O-ring 30.

Next, the tip of a nozzle of a grout injection jig (not shown) is applied to the injection hole 22 of the wedge member 20, and a grout material (not shown) such as cement milk or filler-filled epoxy resin is applied through the injection hole 22. Inject). After the grout material is discharged from the tip of the injection hole 22, the grout material fills the space between the tip surfaces of the two screw rebars 1, and further, the gap between the outer peripheral surface of the screw rebar 1 and the inner peripheral surface of the screw hole 11 of the joint 10. All over the gap. Due to the hardening of the grout material, the connection strength between the threaded reinforcing bar 1 and the joint 10 can be made extremely high in combination with the wedge effect. In addition,
Although a gap is formed between the base end of the wedge member 20 and the peripheral edge of the driving hole 12, a gap between the flange 21 of the wedge member 20 and the flat surface 10a of the joint 10 is sealed by an O-ring 30. The grout material can be prevented from leaking from here.

In the present embodiment, since the grout injection hole 21 is formed in the wedge member 20, the grout injection hole 21 does not affect the sectional area of the joint 10, that is, the strength of the joint 10.

Next, a second embodiment of the present invention will be described with reference to FIG. In the second embodiment, the same reference numerals are given to components corresponding to the first embodiment, and detailed description thereof will be omitted. In the present embodiment, a circular recess 13 having a larger diameter is formed so as to surround the driving hole 12. The diameter of the recess 13 substantially matches the diameter of the flange 22 of the wedge member 20.

In the second embodiment, first, the wedge member 20 is inserted into the driving hole 12 of the joint 10, and the flange 22 is shallowly inserted into the recess 13 of the joint 10. In this state,
The two screw rebars 1 are screwed into the joint 10 such that the tips thereof contact the outer peripheral surface of the wedge member 20. As a result, the two screw rebars 1 project from the periphery of the driving hole 12. Next, the wedge member 20 is driven in so that the flange 22 is deeply housed in the recess 13. Thereafter, the grout material is filled in the same manner as described above. At this time, almost no gap is formed between the outer peripheral surface of the flange 22 and the inner peripheral surface of the concave portion 13 and at least one between the flange 22 and the flat bottom surface of the concave portion 13, so that leakage of the grout material is prevented. it can.

Next, a third embodiment of the present invention will be described with reference to FIG. In the third embodiment, components corresponding to those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. In this embodiment, the grout injection hole 15 is formed not in the wedge member 20 but in the joint 10. Even if the wedge member 20 is hit, the injection hole 15
Does not deform and grout can be smoothly injected.

The present invention is not limited to the above embodiment, and various modes are possible. For example, in the first embodiment, the O-ring may be omitted. In this case, if the amount of protrusion of the distal end of the screw reinforcing bar from the periphery of the driving hole is set to a predetermined amount, the leakage of the grout material is almost impossible because the flange of the wedge member comes into contact with the flat surface of the joint at the end of driving of the wedge member. Can be eliminated. When an O-ring is used, the outer surface of the joint may be a cylindrical surface. This is because the difference in the gap between the flange of the wedge member and the outer surface of the joint can be absorbed by the difference in the amount of elastic deformation of the O-ring. In the second embodiment, an O-ring may be interposed between the bottom surface of the concave portion and the flange. Further, in the second embodiment, the outer surface of the joint may be a cylindrical surface. An annular gap may be formed between the flange of the wedge member and the outer surface of the joint. In this case, at the time of grout injection, the gap may be closed with a removable annular seal member. Further, the flange may not be provided. In this case, at the time of grouting, the gap between the wedge member and the peripheral edge of the driving hole is closed by an annular seal member.

[0020]

As described above, according to the first aspect of the present invention, by screwing in the wedge member and grouting, the screw rebars can be firmly connected via the joint by a simple operation without using a large jig. Can be connected. Further, since the grout injection hole is formed in the wedge member, the cross-sectional area of the joint does not need to be reduced, and the strength can be maintained. According to the invention of claim 2, by driving the wedge member and grouting, the screw rebars can be firmly connected via the joint by a simple operation without using a large jig. Further, since the grout injection hole is formed in the joint, there is no possibility that the cross section of the injection hole is deformed when the wedge member is driven.
The smooth injection of the grout material can be ensured. According to the invention of claim 3, sealing between the wedge member and the joint can be performed by using the flange provided on the wedge member, and the injected grout material does not leak from between the wedge member and the screw reinforcing bar. Can be reliably spread over the gap between the outer peripheral surface of the joint and the inner peripheral surface of the joint. According to the fourth aspect of the present invention, the seal between the flange of the wedge member and the joint can be easily and reliably sealed using the elastic seal ring. According to the fifth aspect of the present invention, the seal between the wedge member and the joint can be performed using the flange and the concave portion, and the injected grout material does not leak from between the wedge member and the joint. And the inner peripheral surface of the joint. According to the invention of claim 6, since the driving hole is formed in the flat outer surface of the joint, the seal between the wedge member and the flange of the joint is easily performed.

[Brief description of the drawings]

1A and 1B are longitudinal sectional views of a threaded bar connecting device according to a first embodiment of the present invention, in which FIG. 1A shows a point in time when screwing of a threaded bar is completed, and FIG. Shown respectively.

FIGS. 2A and 2B are longitudinal sectional views of a threaded bar connecting device according to a second embodiment of the present invention, in which FIG. Shown respectively.

FIG. 3 is a view corresponding to FIG. 1 (B), showing a connecting device for a screw reinforcing bar according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Screw reinforcing bar 10 Joint 10a Flat surface 11 Screw hole 12 Driving hole 13 Depression 15 Injection hole 20 Wedge member 21 Injection hole 22 Flange 30 O-ring (elastic seal ring)

Claims (6)

[Claims] An apparatus for connecting threaded rebars by screwing ends of a pair of threaded rebars to a joint having a threaded hole, further comprising a wedge member, wherein a peripheral wall of the joint has At approximately the center in the axial direction, a driving hole is formed, and the wedge member is driven between the distal ends of the screw threads in the screwed state through the driving hole. A coupling device for a screw reinforcing bar, characterized in that an injection hole for injecting the steel is formed. 2. An apparatus for connecting threaded rebars by screwing ends of a pair of threaded rebars to a joint having a threaded hole, further comprising a wedge member, wherein a peripheral wall of the joint has At approximately the center in the axial direction, a driving hole is formed, and the wedge member is driven between the distal ends of the threaded rebars in the screwed state through the driving hole. An injection hole for injecting a grout material is formed at a position substantially at the center in the axial direction and separated from the driving hole in the circumferential direction. 3. The connecting device for a screw reinforcing bar according to claim 1, wherein a flange larger than the driving hole is formed at a base end of the wedge member. 4. The coupling device for a screw bar according to claim 3, wherein an annular elastic seal ring is interposed between the flange and the outer surface of the joint. 5. The coupling according to claim 3, wherein a recess larger than the driving hole is formed on the outer surface of the joint so as to surround the driving hole, and the flange of the coupling is accommodated in the depression. 4. The connecting device for a screw reinforcing bar according to claim 1. 6. The joint according to claim 3, wherein the outer periphery of the cross section at the center of the joint has a polygonal shape, and the driving hole is formed in one flat surface of the outer surface of the joint. A connecting device for a screw reinforcing bar according to any one of the above.