JPH116248A - Connecting device for threaded reinforcing bar and method for injecting grout - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a threaded reinforcing bar connecting device which makes it possible to check the engaged depth of a joint into a threaded reinforcing bar even after injection of grout. SOLUTION: A connecting device includes a joint 10 with a checking window 12 formed in its center and an intervention 20 consisting of a spring curved into an N shape. With a pair of threaded reinforcing bars engaged with the joint 10, the intervention 20 is made to intervene between the ends 1a of the threaded reinforcing bars 1. The pair of abutting parts 21 of the intervention 20 elastically abut to the ends 1a. After grout is injected, the position of the end 1a of each threaded reinforcing bar 1 can be known from the position of the end of each of the pair of abutting parts 21 placed at the checking window 12, and the engaged depth of the threaded reinforcing bar 1 can also be made sure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a threaded bar connecting apparatus and a grouting method for securing a connecting strength by injecting a grout material into a joint.

[0002]

2. Description of the Related Art As shown in FIG. 12, in a threaded bar connecting device, ends of a pair of threaded bars 1 to be connected are screwed into a tubular joint 2 and then a grout material ( (Not shown) is injected to secure the connection strength. More specifically, as shown in FIG. 12 (A), first, the joint 2 is screwed to one of the threaded rebars 1 and the other threaded rebar 1 is brought into close proximity on the same straight line. The joint 2 is turned so that about half of the joint is screwed to the threaded reinforcing bar 1 of the other party as shown in FIG. In this state, a grout material is injected from an injection hole 3 formed in the center of the joint 2.
Then, the connection work of the screw reinforcing bar 1 is completed with the hardening of the grout material.

[0003] In order to obtain a sufficient connection strength between the screw rebars 1, it is necessary to set the screwing depth of each screw rebar 1 to the joint 2 to a predetermined amount or more. Therefore, conventionally, a marking 5 extending in the longitudinal direction with paint or the like is provided at a position away from the tip 1a of the screw reinforcing bar 1. Distance D ₁ of the between one end (the end closer to the leading end 1a of the screw rebar 1) and the tip 1a of the screw reinforcing bar 1 of the marking 5 is equivalent to the necessary screwing depth. Distance D ₂ between the other end and the threaded rebar 1 tip 1a of the marking 5 is equivalent to engagement depths prohibit any further screwing. This distance D ₂ is equal to the screw reinforcing bar 1 of the other party.
In order to secure the required screw depth. Therefore, if the grout material is injected in a state where both ends of the joint 2 are located at positions corresponding to the markings 5 of the two screw reinforcing bars 1, that is, a state where a sufficient screwing depth is secured, a sufficient connection strength can be secured. In addition, when the connection state is inspected at a later date, the screwing depth of the screw rebar can be confirmed from the positional relationship between the marking 5 and both end positions of the joint 2.

[0004]

As described above, conventionally, in order to confirm the screwing depth of the threaded rebar 1, the threaded rebar 1
However, the operation of applying the markings 5 has to be applied or sprayed with a paint using a jig or the like, and requires a lot of labor and is very troublesome.

[0005]

According to the first aspect of the present invention, a grout material is injected into a gap between the joint and the threaded bar while the ends of the pair of threaded bars are screwed to the joint. In the apparatus for connecting the screw rebars, in the center of the joint, a confirmation window for confirming the tips of both threaded rebars is formed. It is characterized by being equipped with inclusions arranged in the window. According to a second aspect of the present invention, in the connection device for a screw rebar according to the first aspect, the inclusion includes a pair of abutting portions that are opposed to each other with a changeable interval, and the abutting portions are formed of a pair of the screw rebars. It is characterized in that it hits the tip, respectively, and the end is arranged in the confirmation window.
According to a third aspect of the present invention, in the connecting device for a screw rebar according to the second aspect, the inclusion is made of a spring material bent in an N-shape, and left and right portions thereof are provided as the pair of contact portions. It is characterized by the following. According to a fourth aspect of the present invention, in the connecting device for a screw rebar according to the second aspect, the inclusion includes the pair of abutting portions that are substantially parallel to each other, and a spring that connects the abutting portions. It is characterized by. According to a fifth aspect of the present invention, in the connection device for a screw rebar according to the second aspect, the inclusion is formed of a V-shaped spring material, and left and right portions thereof are provided as the pair of contact portions,
The bent portion is fixed at a position radially facing the confirmation window on the inner peripheral surface of the joint.

According to a sixth aspect of the present invention, there is provided a method for injecting a grout material into the threaded bar connecting device according to any one of the first to fifth aspects, wherein the confirmation window is filled with a plugging material, and a circumferential direction is defined from the confirmation window. The nozzle of the injector is connected to the injection hole formed apart from the injection hole, and the grout material is injected from the injector through the injection hole into the gap between the joint and the threaded reinforcing bar. According to a seventh aspect of the present invention, in the method for injecting a grout material into the threaded bar connecting device according to any one of the first to fifth aspects, a sealing member is applied to an outer surface of the joint so as to surround the confirmation window,
A nozzle of an injector is connected to a connection port formed in the seal member, and a grout material is injected from the injector through a confirmation window into a gap between the joint and the screw reinforcing bar.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a connecting device for a screw rebar according to an embodiment of the present invention. The joint 10 used in the present embodiment has a cylindrical shape with a hexagonal cross section, and a female screw 11 for screwing the screw reinforcing bar 1 is formed on the inner periphery. Further, two confirmation windows 12 and one injection hole 13 are formed in the center of the joint 10 in the longitudinal direction.

The two confirmation windows 12 face each other in the radial direction. These confirmation windows 12 are for visually recognizing the tips of the double-threaded reinforcing bars 1 from the outside, and are formed by long holes extending in the longitudinal direction. Marks 14 are provided near both ends of the confirmation window 12, and the distances D from these marks 14 to the end 10a of the joint 10 are equal. This distance D corresponds to the minimum required screwing depth of the screw reinforcing bar 1. Note that the distance between the end of the confirmation window 12 and the end 10a of the joint 10 may be set to the minimum necessary screwing depth without providing the mark 14.

The injection hole 13 is for injecting a grout material, and is a circular hole. This injection hole 13
Is formed at a position away from the confirmation window 12 in the circumferential direction of the joint 10.

The connecting device according to the present embodiment includes an intervening member 20 interposed between the distal ends 1a of the screw reinforcing bar 1. In the present embodiment, the inclusion 20 is formed of a leaf spring (spring material) bent in an N-shape, and a pair of right and left contact portions 21 that are substantially parallel to each other, and these contact portions 21 are connected in a cross-shaped manner. And a connecting portion 22 to be connected.

A first method of connecting the pair of threaded reinforcing bars 1 to the joint 10 in the above configuration will be described. First,
In a state where the joint 10 is screwed into one of the screw reinforcing bars 1 over the entire length, the other screw reinforcing bars 1 are arranged on the same straight line, and the tips 1a of the screw reinforcing bars 1 are brought close to each other. In this state, the joint 10 is turned, and about half of the joint 10 is screwed into the other threaded reinforcing bar 1 to obtain the state shown in FIG.

Next, looking through the confirmation window 12 of the joint 10,
It is checked whether the tips 1a of both threaded reinforcing bars 1 can be seen between the two stamps 14. If it can be seen, it is determined that both the screw rebars 1 are screwed to the joint 10 in a state where the necessary screwing depth is secured. If the tip 1a of both or one of the threaded rebars 1 is not visible between the inscriptions 14, it is determined that the required threading depth is not attained, and the threading of the invisible threaded rebar 1 is determined.
Advance until the tip 1a is located between the markings 14.

After the completion of the screwing, the inclusion 20 is inserted into the joint 10 through one of the confirmation windows 12 as shown in FIG. That is, the operator sandwiches the pair of abutting portions 21 with the fingers and shrinks the intervening body 20 so as to bring them closer to each other, and in this state, inserts the interposition between the distal end 1a of the pair of screw reinforcing bars 1 through the confirmation window 12. Then, when the central portion of the pair of abutting portions 21 reaches between the distal ends 1a of the screw reinforcing bar 1, the hand is released from the pair of abutting portions 21. Thereby, as shown in FIGS. 1B and 2, the pair of abutting portions 21 of the inclusion 20 abut elastically on the tips 1 a of the pair of threaded reinforcing bars 1.
In this state, both ends of each contact portion 21 are connected to a pair of confirmation windows 1.
2 and preferably project slightly from the outer surface of the joint 10.

Next, a second method for connecting the screw reinforcing bar 1 to the joint 10 will be described with reference to FIG. In this method, as shown in FIG. 3A, the inclusion 20 can be fitted in the confirmation window 12 in advance. To this end, when the inclusion 20 is in a natural state, the separation distance between the contact portions 21 needs to be larger than the length of the confirmation window 12, and in the fitted state, the pair of contact portions 21 Must be elastically applied to both ends.

As described above, in a state where the inclusion 20 is fitted into the joint 10, as shown in FIG.
The joint 10 is screwed half into the screw reinforcing bar 1 of the above. At this time, one (left) contact part 21 of the inclusion 20 is pushed by the tip 1a of the screw reinforcing bar 1 and moves rightward. When the left contact portion 21 exceeds the left marking 14, the screwing operation is completed. Next, as shown in FIG. 3 (C), the other (right) threaded reinforcing bar 1 is arranged coaxially with the joint 10, and FIG.
As shown in (1), the threaded rebar 1 is turned and screwed into the joint 10. As a result, the other (right) abutting portion 21 of the inclusion 20 is pushed by the tip 1a of the screw reinforcing bar 1 and moves toward the left. When the right contact portion 21 has passed over the right stamp 14, the screwing operation is completed. As a result, the final state becomes the same as the above-mentioned first method. In this method, the inclusions 20 may be fitted after the pair of screw reinforcing bars 1 are screwed to the joint 10.

In any of the two connection methods described above, when the screwing of the threaded rebar 1 is completed and the inclusion 20 is mounted, as shown in FIG.
A molten resin having a relatively high viscosity is poured into the block 2 as the closing material 30, and the confirmation window 12 is closed by the hardening. In addition,
A material such as clay that plastically deforms may be used as the plugging material for filling the confirmation window 12. Next, the injector 50 is inserted into the injection hole 13.
And a grout material (not shown) such as cement milk or filler-filled epoxy resin is injected. As a result, the grout material passes through the injection hole 13 and fills the gap between the outer peripheral surface of the screw reinforcing bar 1 and the inner peripheral surface of the joint 10. In the grouting operation, the confirmation window 12 is used.
Is closed, so that the grout material does not leak from the confirmation window 12.

Both ends of the pair of abutting portions 21 of the inclusion 20 are respectively disposed in the pair of confirmation windows 12 and are exposed to the outside from the closing material 30. Therefore, after the grout material is injected, the positions of the tips 1a of the two threaded rebars 1 can be confirmed from the outside, and the screwing depth of the threaded rebar 1 can be confirmed. When only one confirmation window 12 is formed in the joint 10, a pair of contact portions 21
Is arranged in the confirmation window 12 only.
When the closing material 30 has transparency and translucency, the contact portion 21 of the inclusion 20 may be buried in the closing material 30 and may not be exposed to the outside.

Next, another embodiment of the grouting material injection method will be described. In FIG. 5, the width of the confirmation window 12 is reduced. Therefore, even when the confirmation window 12 is not closed, leakage from the confirmation window 12 can be minimized when grout is injected from the injection hole 13.

In the injection method shown in FIG. 6, two injection holes 1 are provided.
A joint 10 having 3 is used. Each injection hole 13 is located between the confirmation window 12 and the end of the joint 10. At the time of injecting the grout material from these injection holes 13, the grout material is divided into two parts from the injection holes 13, one of which reaches the end 10 a of the joint 10 through the gap between the threaded reinforcing bar 1 and the joint 10,
The other reaches the confirmation window 12 through the gap between the screw reinforcing bar 1 and the joint 10. Therefore, if the pouring operation is terminated when the grout material leaks from the confirmation window 12, the confirmation window 1
2 can be reduced.

In the injection method shown in FIG. 5 and FIG.
2 may be blocked by the grout material.
With the abutment portion 21 of 0, the screwing depth of the screw reinforcing bar 1 after the grout material injection operation can be confirmed. In addition, FIG.
In the injection method of FIG. 6, an object may be applied to the outer surface of the joint 10 to close the confirmation window 12 when the grout material is injected.

In the injection method shown in FIG. 7, the joint 10 having no injection hole is used, and the grout material is injected through the confirmation window 12. More specifically, a tubular seal member 60 that can be split in half is used at the center of the joint 10.
0 is attached to the outer peripheral surface of the central part of the joint 10, and the confirmation window 12 is closed. A connection port 61 is formed in the seal member 60 at a position corresponding to the one confirmation window 12, and the nozzle tip of the injector 50 is connected to the connection port 61. When the grout material is injected from the injector 50, the grout material is injected into the joint 10 from one of the confirmation windows 12, and is filled in the gap between the threaded reinforcing bar 1 and the joint 10. Also in this method, although the confirmation window 12 is closed with the grout material, the abutment portion 21 of the inclusion 20 can confirm the screwing depth of the screw reinforcing bar 1 after the grout material injection operation.

Next, another embodiment of the inclusion will be described. The inclusion 120 shown in FIG. 8 is configured by bending a spring material formed of a thin rod into an N shape.
This inclusion 120 also has a pair of abutting portions 121 and a connecting portion 122 as in the first embodiment. This inclusion 120 is effective when the width of the confirmation window 12 is narrow as shown in FIG. The inclusion 220 shown in FIG. 9 is a pair of elongated flat plate-shaped contact portions 221 that are substantially parallel to each other.
And a coil spring 222 (connecting portion) connected between the center portions of the contact portions 221. Due to the elastic deformation of the spring 222, the interval between the pair of contact portions 221 can be changed.

The inclusion 320 shown in FIG. 10 is made of a spring plate or a thin rod spring material bent in a V-shape, and has a pair of right and left contact portions 321. The bent portion 325 of the inclusion 320 is fixed to the inner peripheral surface of the joint 10 by welding or the like at a position radially facing the confirmation window 12. The end of the contact portion 321 is arranged in the confirmation window 12, and slightly protrudes from the outer surface of the joint 12 in a state of contacting both ends of the confirmation window 12. In this embodiment, the threaded reinforcing bar 1 is screwed to the joint 10 by the second method shown in FIG. When this inclusion 320 is pushed to the tip of the screw reinforcing bar, the bent portion 325 is formed.
Elastically deform so as to change the angle of the pair of contact portions 3
21 are changed.

In the embodiment shown in FIG. 11, a portion of the inner peripheral surface of the joint 10 that faces the confirmation window 12 in the radial direction is
An accommodation groove 19 extending in the longitudinal direction is formed. The bent portion 325 of the inclusion 320 is welded to the center of the accommodation groove 19. The ends of the contact portions 321 of the inclusions 320 do not contact both ends of the confirmation window 12, and the confirmation windows 12 allow the ends of the contact portions 321 to pass through. In this configuration, the threaded rebar 1 can be screwed to the joint 10 by the second method shown in FIG. 3, as well as the first method shown in FIG. 1. When screwing is performed by the first method, the pair of abutting portions 321 of the inclusion 320 are tilted down by the screw reinforcing bar 1 when the joint 10 is screwed to one screw reinforcing bar 1 over the entire length. When the joint 10 is accommodated in the accommodating groove 19 and is moved toward the other threaded reinforcing bar 1, the joint 10 is raised and its end is placed in the confirmation window 12 again.

The inclusions 120 and 22 shown in FIGS.
Even when using 0,320, grout injection is performed as shown in FIGS.
One of the methods in FIG. 7 can be selected. As the inclusion, for example, a hard or elastic wedge member that is fitted between a pair of threaded reinforcing bars may be used. This is because the position of the tip of the screw reinforcing bar can be determined from the position of the wedge member.

[0026]

As described above, according to the first aspect of the present invention, even if the confirmation window is closed after the grout material is injected, the screw rebar is required to have a required screwing depth by the inclusion. It can be easily checked from outside whether or not it is screwed. Therefore, a sufficient connection strength can be ensured, and a marking for confirming the screwing depth does not have to be provided on the screw reinforcing bar. According to the second aspect of the present invention, since the pair of abutting portions indicate the tip positions of the screw rebars, it is possible to accurately confirm the screwing depth. According to the third aspect of the present invention, since the N-shaped spring material is used as the inclusion, the structure is simple and the manufacturing can be performed at low cost. Further, the interval between the pair of contact portions can be easily changed by the elastic deformation of the spring material, and the position of the contact portion can be accurately indicated. According to the fourth aspect of the invention, the interval between the contact portions can be easily changed by the elastic deformation of the spring, and the position of the contact portion can be accurately indicated. According to the fifth aspect of the present invention, since the V-shaped spring material is used as the inclusion, the structure can be simplified and the device can be manufactured at low cost. Further, the interval between the pair of contact portions can be easily changed by the elastic deformation of the spring material, and the position of the contact portion can be accurately indicated. According to the invention of claim 6, since the confirmation window is closed when the grout material is injected from the injection hole, it is possible to eliminate leakage of the grout material from the confirmation window. According to the invention of claim 7, since the grout material is injected through the confirmation window, leakage of the grout material from the confirmation window can be eliminated.

[Brief description of the drawings]

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a longitudinal sectional view of a threaded bar connecting device according to an embodiment of the present invention, in which (A) shows a state in which the screwing of the threaded bar has been completed, and (B) shows a state between the tips of the threaded bar. Shows a state in which an inclusion is inserted into the area.

FIG. 2 is a plan view of the connection device, showing a state in which an inclusion is inserted between tips of a screw reinforcing bar.

FIGS. 3A to 3D are schematic diagrams sequentially illustrating another embodiment of a method of connecting a threaded reinforcing bar to a joint.

FIG. 4 is a schematic view showing a grout injection method executed after the screwing of the threaded rebar and the mounting of the inclusions are completed.

FIG. 5 is a schematic view showing another embodiment of the grout injection method.

FIG. 6 is a schematic view showing still another embodiment of the grout injection method.

FIG. 7 is a schematic view showing still another embodiment of the grout injection method.

FIG. 8 is a perspective view showing another form of the inclusion.

FIG. 9 is a side view showing still another form of the inclusion.

FIG. 10 is a longitudinal sectional view of a connecting device according to another embodiment.

FIG. 11 is a longitudinal sectional view showing another embodiment of a connecting device using an inclusion similar to that of FIG. 10;

FIGS. 12A and 12B are explanatory views of a conventional procedure for connecting a threaded reinforcing bar.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 threaded reinforcing bar 1 a tip 10 joint 12 confirmation window 13 injection hole 20, 120, 220, 320 inclusion 21, 121, 221, 321 contact part 22, 122 connecting part 222 spring 325 bent part

Claims (7)

[Claims] 1. A device for connecting threaded rebars by injecting a grout material into a gap between the joint and the threaded rebar in a state where ends of a pair of threaded rebars are screwed to the joint, In the center of the joint, a confirmation window for confirming the tips of both threaded rebars is formed.Furthermore, an interposition is provided between the tips of the threaded rebars and the end is disposed in the confirmation window. A coupling device for a screw reinforcing bar. 2. The method according to claim 1, wherein the inclusion includes a pair of abutting portions facing each other with a changeable interval, the abutting portions respectively abutting against the tips of a pair of threaded rebars, and the ends are disposed in a confirmation window. The coupling device for a screw reinforcing bar according to claim 1, wherein: 3. The connection according to claim 2, wherein the inclusion is made of a spring material bent in an N-shape, and left and right portions thereof are provided as the pair of contact portions. apparatus. 4. The connecting device according to claim 2, wherein the inclusion includes the pair of contact portions that are substantially parallel to each other, and a spring that connects the contact portions. . 5. The method according to claim 5, wherein the inclusion is formed of a V-shaped spring material, and left and right portions thereof are provided as the pair of abutting portions, and the bent portion faces the confirmation window radially on the inner peripheral surface of the joint. The connecting device for a screw reinforcing bar according to claim 2, wherein the connecting device is fixed at a set position. 6. A method for injecting a grout material into a threaded bar connecting device according to claim 1, wherein said confirmation window is formed with a plugging material packed therein and formed to be circumferentially separated from said confirmation window. A grout material is injected into the gap between the joint and the threaded rebar through the injection hole by connecting a nozzle of the injector to the injected injection hole. 7. A method according to claim 1, wherein a sealing member is applied to an outer surface of the joint so as to surround the confirmation window, and a connection port formed in the sealing member. A grout material is injected into the gap between the joint and the threaded reinforcing bar from the injector via a confirmation window.