JPH11200559A - Joint metal tool for reinforcement and jointing made of reinforcement in temporary opening of reinforced concrete frame body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate connection of reinforcements by forming a through hole in which reinforcements can be inserted and forming a hardener injection hole communicating with the central part of the through hole from a butt end face where the through hole is opened and forming an air vent hole communicating with the through hole from the butt end face. SOLUTION: A nearly hexagonal columnar joint metal fitting 10 is formed with a metallic or synthetic resin material. A through hole 13 formed to communicate with both butt end faces 11, 12 and provided with a screw at the inside wall face is bored at the center part of the joint metal fitting 10. And further, resin injection holes 14, 15 communicating with the central part of the through hole 13 from the butt ends 11, 12 where the through hole 13 is opened, and air vent holes 16a, 16b communicating with the through hole 13 from the butt end faces 11, 12 are formed. The end of reinforcement 25 is inserted from the butt end face 12 side to the central part of the through hole 13. And the body 21 of a seal member 20 is inserted from the butt end face 11 side to closely stick the sealing part 22 to the butt end face 11. A resin 26 is injected into the through hole 13 from a hardener injection hole 15 and hardened. Accordingly, safety of traffic and works can be kept.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint of a reinforcing bar for connecting reinforcing bars of a reinforced concrete portion to be preceded and a reinforced concrete portion to be integrated with the preceding portion, and to use this joint. The present invention relates to a method of connecting a reinforcing bar at a temporary opening of a reinforced concrete skeleton.

[0002]

2. Description of the Related Art As is well known, a structure in which a plurality of continuous reinforced concrete skeletons are integrated is divided into a plurality of sections and sequentially constructed at regular intervals. In the case of closing the temporary opening formed to carry in and out equipment and materials at the time of building this skeleton, such as when closing it by post-processing,
When integrating a reinforced concrete member constructed by post-processing, it is necessary to connect the reinforcing bar and the reinforcing bar of the preceding skeleton together to form a series of reinforcing bars at the time of reinforcing the post-processing portion. Conventionally, as a means for joining such reinforcing bars, a lap joint in which ends of both reinforcing bars are overlapped and tightened, and a press-fitting joint (including a welded joint) in which the butted portions of the two reinforcing bars are integrated by heating and pressing. Alternatively, a mechanical joint or a joint using a coupler that is joined by injecting and curing a resin is used.

[0003]

As shown in FIG. 9, among the various conventional joints described above, the lap joint has a reinforcing bar 2 of the preceding reinforced concrete portion 1 until the post-construction portion is constructed. Is required to protrude by a length L which is equal to or longer than a required overlapping length determined for the rebar diameter. Also, at least in the case of press-fit joints,
The rebar of the required length to be gripped by the crimping machine must likewise protrude from the preceding reinforced concrete part. For this reason, the reinforcing bar 2 protruding from the preceding concrete part 1 hinders traffic or is not preferable for safety, and is usually bent as shown by a dotted line in FIG. When constructing the construction part, it is necessary to bend again as shown by the solid line in the figure,
There is a problem that much labor and cost are required for the operations such as bending and unbending. In addition, there is a problem that an excessive bending force acts on the reinforcing bar 2 due to the bending and the return of the bending, which adversely affects the physical properties of the reinforcing bar.

[0004] In particular, when a lap joint or a press-fit joint as described above is used as a joint of a reinforcing bar in a temporary opening of a preceding reinforced concrete skeleton, equipment and materials are carried in so as not to interfere with the protruding reinforcing bar 2. In order to secure an effective area for the temporary opening, it is necessary to previously set the area of the temporary opening to be large, and therefore, in planning, the installation position of the opening is greatly restricted, and such a temporary opening area is reduced. There is a problem that it is necessary to bend the reinforcing bar 2 in a place where it cannot be secured.

On the other hand, as couplings using the above-mentioned couplers, mechanical and resin couplers are known.
Here, the mechanical coupling coupler is made of metal with a screw formed inside, and the screw reinforcing bar to be connected is screwed from both sides, and further tightened with nuts arranged at both ends, whereby both reinforcing bars are connected. Are connected mechanically. As shown in FIG. 10, the resin type coupler 5 is
The two reinforcing rods are screwed into the screw holes 6 formed therein, and the resin is injected into the inside from the resin injection port 7 communicating with the screw holes 6 from the central portion and hardened, thereby connecting the two reinforcing bars. It is to be integrated.

According to such a joint coupler, there is an advantage that the protrusion of the reinforcing bar is shorter than that of the above-mentioned lap joint or press-fit joint. However, when a mechanical joint coupler is used, at least the joint coupler is used. The length of the nut at the end and the length required for the nut tightening operation protrude from the preceding reinforced concrete portion, which also hinders traffic. Also, as shown in FIG. 11, when the resin-type joint coupler 5 is used, the tip of the normal reinforcing bar 9 projects from the preceding reinforced concrete portion 8, and the joint coupler 5 is temporarily moved to the concrete portion 8 in advance. However, at least the leading end portion from the resin injection port 7 must be exposed to the outside. Moreover, if the joint coupler 5 is embedded in the preceding skeleton as a joint of a reinforcing bar at the temporary opening of the preceding reinforced concrete skeleton, there is a possibility that the protruding portion interferes with equipment to be carried in and may be damaged.

SUMMARY OF THE INVENTION The present invention has been made to effectively solve the problems of the conventional joints of various types of reinforcing steel, and can be connected to a reinforcing steel for post-processing without projecting from a preceding reinforced concrete part. It is an object of the present invention to provide a rebar joint fitting that can be used and a method for connecting a rebar at a temporary opening of a reinforced concrete skeleton using the same.

[0008]

According to a first aspect of the present invention, there is provided a joint fitting for a reinforcing bar according to the present invention, wherein a through-hole through which a reinforcing bar can be inserted is formed, and the through-hole is formed from a cut end of the through-hole. A hardening agent injection hole communicating with the central portion and an air vent hole communicating with the through hole from the cut end surface are formed. Here, the invention described in claim 2 is
A plurality of the air vent holes are formed, and the openings of the respective air vent holes on the through-hole side are opened at different positions between the central portion of the through hole and the front end of the opening. According to a third aspect of the present invention, the curing agent injection hole and the air vent hole according to the first or second aspect have different diameters from each other.

According to a fourth aspect of the present invention, there is provided a method of connecting a reinforcing bar at a temporary opening of a reinforced concrete skeleton according to the present invention, wherein the reinforced concrete skeleton to be preceded is firstly laid out. From one side of the through hole formed in the joint metal fitting of the reinforcing bar, the end of the reinforcing bar facing the temporary opening is formed by inserting a space into the other side, and the space is inserted from the other side of the through hole. After inserting a seal member to close the part, and then injecting and hardening a hardening agent into the through hole from the hardening agent injection hole on the one side, cast concrete and bury the joint hardware in the preceding frame, When closing the temporary opening with reinforced concrete, first remove the seal member and insert the end of the reinforcing bar at the portion that closes the temporary opening into the through hole of the fitting from the other side, and then cure the hardening agent on the other side. After connecting the reinforcing bars to each other by solidifying by injecting a curing agent in the through hole from the entry apertures, is characterized in that for closing the temporary opening by Da設 concrete.

In this case, the invention according to claim 5 uses the one in which a flange-shaped sealing portion is integrally formed at one end of the main body as the sealing member, and cures the one side. When injecting a hardening agent into the through hole from the agent injection hole, the main body is inserted into the through hole from the other side, and the sealing portion seals the hardening agent injection hole and the air vent hole on the other end of the wood. It is characterized by closing the opening.

In the metal fittings for reinforcing bars according to any one of claims 1 to 3, since the hardening agent injection hole communicating from the cut end surface to the central portion of the through hole is formed, the reinforcing steel in the post-processing portion is formed as described above. It is possible to inject a hardening agent such as resin into the inside through the hardening agent injection hole from the tip side by inserting into the through hole. Also, at this time, the air inside the through hole can be similarly extracted from the air vent hole that opens to the above-mentioned cut edge. As a result, when the concrete of the preceding reinforced concrete part is poured, the whole joint fitting can be directly buried in the reinforced concrete part. For this reason, there is no hindrance to traffic and work unlike the conventional one.

In this case, according to the second aspect of the present invention, the plurality of air vent holes are formed such that the openings on the side of the through holes are different from each other between the central portion of the through hole and the cut surface. The opening is formed so that the inside air can be smoothly discharged with the injection of the curing agent, and the degree of filling is checked by the leakage of the curing agent from the air vent hole. It becomes possible. Further, according to the third aspect of the present invention, since the hardener injection hole and the air vent hole are formed to have different diameters from each other, it is possible to easily determine the hardener injection hole and the air vent hole during operation. it can.

Therefore, according to the method of connecting a reinforcing steel in a temporary opening of a reinforced concrete skeleton according to claim 4 or 5, wherein the reinforcing metal according to any one of claims 1 to 3 is used. Since it does not protrude from the preceding body into the temporary opening, the safety of traffic and work is improved, and there is no possibility of damage due to interference with the equipment to be carried in. Furthermore, since the temporary opening may be set to an effective area for carrying equipment and materials, the area of the temporary opening can be made smaller than before, and construction by forming the temporary opening can be performed. The frame loss at the time can be minimized.

In this case, if the seal member according to claim 5 is used, the main body of the seal member is inserted into the through hole, and the hardening agent injection hole and the air vent hole on the cut edge are formed by the sealing portion. By closing the opening, the main body prevents the hardener and concrete to be injected earlier from entering the space where the rebar to be inserted later is to be inserted, and the sealing allows the concrete to flow from the hardener injection hole and the air vent hole. This is preferable because it can be prevented from intruding inside.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 3 show an embodiment of a joint fitting for a reinforcing bar according to the present invention. The metal fittings 10 are formed in a substantially hexagonal column shape using a metal or a synthetic resin.
A through hole 13 is formed, which penetrates between 1 and 12 and has a thread formed on the inner wall surface. Also, this fitting 1
In the case of 0, the cut surfaces 11, 12 in which the through holes 13 open
And resin injection holes (hardening agent injection holes) 14 and 15 communicating with the central portion of the through hole 13 and a plurality of air vent holes 16 a and 16 communicating with the through holes 13 from the cut surfaces 11 and 12 respectively.
b, 17a and 17b are formed. In FIG. 1, the resin injection hole 15 and the air vent holes 17a and 17b that are opened on the cut edge 12 on the back side in the figure are omitted for convenience of visual observation.

Here, the one air vent hole 16a opened on the cut edge 11 is formed such that the end on the through hole 13 side is opened at a position deviated more toward the cut edge 11 than the opening of the resin injection hole 14. The other air vent hole 16b is
The end on the side of the through hole 13 is formed so as to open at a substantially intermediate position between the opening of the air vent hole 16a and the cut edge surface 11. The air vent holes 17a and 17b opened on the side of the wood opening 12 are respectively provided with the air vent holes 16a and 1b.
6b. Further, the resin injection holes 14 and 15 have inner diameters of the air vent holes 16a and 1a.
6b, 17a, and 17b are formed larger in diameter.

Next, an embodiment of a method of connecting a reinforcing bar at a temporary opening of a reinforced concrete frame according to the present invention using the joint fitting 10 having the above-described configuration will be described with reference to FIGS. FIG. 4 shows a seal member 20 used in this connection method. This sealing member 2
Numeral 0 denotes a hat type in which the main body 21 and the sealing portion 22 are integrally formed of synthetic resin or metal.
1 has such a size that its outer diameter is densely inserted into the through hole 13 of the fitting 10. The outer diameter of the sealing portion 22 is formed to be sufficient to close the openings of the resin injection hole 14 and the air vent holes 16a and 16b in the opening 11.

Using the joint fitting 10 and the seal member 20 as described above, first, as shown in FIG. Insert the end of the reinforcing bar 25 facing the part up to almost the center of the through hole 13,
From the side, the main body 21 of the seal member 20 is inserted so as to close the space inside the through-hole 13, and the sealing portion 22 is brought into close contact with the cutout surface 11. At this time, the metal fittings 10 are arranged so that the opening 11 of the fitting 10 is flush with the side surface of the preceding body.
Then, a resin (hardening agent) 26 is injected into the through-hole 13 from the hardening agent injection hole 15 on the side of the cut end surface 12 and solidified.
Next, as shown in FIG. 6, the entire joint fitting 10 is buried in the preceded reinforced concrete skeleton 27 by temporarily placing a mold (not shown) and placing concrete.

When closing the temporary opening 28 formed in this way, first, as shown in FIG. 7, after the sealing member 20 is removed from the joint fitting 10, as shown in FIG. Inserting the end of the reinforcing bar 29 at the portion closing the portion 28 into the through-hole 13 from the side of the wood opening 11 of the joint fitting 10,
Further, the resin 30 is injected into the through-hole 13 from the hardener injection hole 14 and solidified. Thereby, the above-mentioned rebar 25, 29
Are connected to each other by the joint fitting 10 and the resins 26 and 30. After the arrangement of the reinforcing bars on the temporary opening 28 and the installation of the formwork are completed, the temporary opening 28 is closed by pouring concrete.

In the method of connecting the reinforcing bar at the temporary opening of the reinforced concrete skeleton using the above-mentioned metal fitting 10 of the reinforcing bar, a resin injection hole 14 communicating from the cut edge 11 to the center of the through hole 13 is formed. Therefore, after the rebar 29 of the post-processing part is inserted into the through hole 13, the resin 30 can be injected into the inside through the resin injection hole 14 from the tip end 11 side. At this time, the air inside the through-hole 13 is also released into the air vent hole 16
a, 16b. Therefore, when the concrete of the preceding reinforced concrete skeleton 27 is poured, the whole joint fitting 10 can be buried in the reinforced concrete skeleton 27 as it is, so that the joint fitting 10 is moved from the preceding skeleton 27 to the temporary opening 28. Because it does not protrude, the safety of traffic and work is improved,
There is no possibility of damage due to interference with the equipment to be carried in.
In addition, since the temporary opening 28 may be set to an effective area for carrying in equipment and materials, the area of the temporary opening 28 can be made smaller than in the conventional case, and thus the temporary opening 2
8 can be minimized at the time of construction for forming.

When the resins 26 and 30 are injected into the through holes 13, a plurality of air vent holes 16a, 16b and 17 are provided.
a and 17b are formed so that the ends on the side of the through holes 13 are opened at different positions between the central portion and the cut edges 11 and 12, respectively. Air can be discharged smoothly,
The degree of filling can be checked by leaking the resin from the air vent holes 16a, 16b, 17a, 17b. Further, the resin injection holes 14, 15
And the air vent holes 16a, 16b, 17a, 17b are formed with different diameters, so that the hardener injection hole and the air vent hole can be easily distinguished at the time of work.

When constructing the preceding reinforced concrete skeleton 27, the main body 21 of the sealing member 20 is inserted into the through hole 1
3 and the opening of the resin injection hole 14 and the air vent holes 16a and 16b of the wood opening 11 are closed by the sealing portion 22. It is possible to prevent the hardening agent or concrete to be injected earlier from intruding, and prevent the concrete from intruding into the interior through the resin injection hole 14 and the air vent holes 16a and 16b by the sealing portion 22.

In the description of the above embodiment, the description has been given only of the case where the joint fitting 10 of the reinforcing bar according to the present invention is used for connection at the temporary opening 28 of the reinforced concrete skeleton 27. However, the present invention is not limited to this. The joint fitting 10 is used for dividing a structure in which a plurality of continuous reinforced concrete skeletons are integrated into a plurality of sections and sequentially constructing them at regular intervals, or as a single preceding reinforced concrete member such as a column or a beam. Reinforcement joints for integrating various precast reinforced concrete parts with reinforced concrete members constructed by post-processing, such as when continuous or integrated columns or beams of the same or different shape are post-constructed Can be used as Further, the present invention can be applied not only to the connection between the reinforcing bars (main bars) but also to the connection between, for example, an anchor reinforcing bar and a retrofit support. In this case, the inner diameter of the through hole of the joint metal is From the central portion to one side, the dimensions correspond to the outer diameter of the anchor rebar, and the other side from the central portion is formed to have a larger diameter than the outer diameter of the retrofit support. I just need.

[0024]

As described above, according to the reinforcing metal fitting according to any one of claims 1 to 3, a hardening agent such as a resin is injected into the inside through the hardening agent injection hole from the tip side. And the air inside the through-hole can be similarly extracted from the air vent opening at the cut edge, so that when the concrete of the preceding reinforced concrete part is poured, the entire joint hardware is left as it is. It can be buried in the reinforced concrete part, so that there is no hindrance to traffic and work unlike the conventional one. In particular, according to the second aspect of the present invention, when the curing agent is injected, the internal air can be smoothly discharged from the plurality of air vent holes, and the hardener leaks from the air vent holes. This makes it possible to check the degree of filling, and according to the third aspect of the invention, it is possible to obtain an effect that the hardener injection hole and the air vent hole can be easily distinguished during work.

Therefore, according to the method for connecting a reinforcing bar at a temporary opening of a reinforced concrete skeleton according to claim 4 or 5, which is an example using the above-mentioned reinforcing metal fitting, the joint metal projects from the preceding skeleton to the temporary opening. Because of this, the safety of traffic and work is improved, and there is no danger of damage due to interference with the equipment to be carried in, and the temporary opening is effective for carrying in equipment and materials. Since it is sufficient to set the area, it is possible to make the area of the temporary opening smaller than before, and it is possible to minimize frame defects during construction due to the formation of the temporary opening.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a rebar joint fitting of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a front view of FIG. 1;

FIG. 4 is a perspective view showing a seal member used in an embodiment of a method of connecting a reinforcing bar according to the present invention.

FIG. 5 is a plan view showing a state in which a reinforcing agent and a sealing member are inserted into a fitting and a hardening agent is injected in an embodiment of the method for connecting a reinforcing bar of the present invention.

FIG. 6 is a plan sectional view showing a state in which the fitting hardware of FIG. 5 is embedded in the concrete of the preceding body.

FIG. 7 is a plan sectional view showing a state where a seal member of FIG. 6 is removed.

FIG. 8 is a plan sectional view showing a state in which a post-construction reinforcing steel is connected to the fitting in FIG. 7;

FIG. 9 is a longitudinal sectional view showing a state in which a reinforcing bar protrudes from a leading body in a conventional lap joint.

FIG. 10 is a perspective view showing a conventional coupling coupler.

FIG. 11 is a longitudinal sectional view showing an attached state of the joint coupler of FIG. 10;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Fitting metal fittings 11, 12 Kiguchi surface 13 Through hole 14, 15 Resin injection hole (hardening agent injection hole) 16a, 16b, 17a, 17b Air vent hole 20 Sealing member 21 Main body 22 Sealing part 25, 29 Reinforcing steel 26, 30 Resin (Curing agent)

Claims (5)

[Claims] 1. A through-hole through which a reinforcing bar can be inserted is drilled, and a hardener injection hole communicating with a central portion of the through-hole from an opening at the opening of the through-hole, and a through-hole from the opening at the opening. A rebar joint fitting having a communicating vent hole. 2. A plurality of said air vent holes are formed, and each of said air vent holes has an opening at a through hole side at a different position between a central portion of said through hole and said cut end surface. The joint fitting for a reinforcing bar according to claim 1, wherein: 3. The metal fitting for a reinforcing bar according to claim 1, wherein said hardening agent injection hole and said air vent hole have different diameters. 4. When arranging a reinforced concrete skeleton to be preceded, firstly, from one side of a through hole formed in a joint fitting of a reinforced concrete according to any one of claims 1 to 3, a temporary opening is formed. The end of the facing reinforcing bar is formed with a space on the other side and inserted, and a sealing member for closing the space is inserted from the other side of the through hole, and then the hardener injection hole on the one side is inserted into the through hole. After injecting and hardening a hardening agent into the inside, concrete is cast and the joint fitting is buried in the preceding building body.When closing the temporary opening with reinforced concrete, first remove the seal member, and The end of the reinforcing bar at the portion that closes the temporary opening is inserted into the through hole of the fitting from the other side, and then a hardener is injected into the through hole from the hardener injection hole on the other side and solidified. By After connecting the reinforcing bars to each other, a method of connecting reinforcing bar in the temporary opening of the by Da設 concrete reinforced concrete skeleton, characterized in that for closing the temporary opening. 5. A sealing member in which a flange-shaped sealing portion is integrally formed at one end of a main body portion, and a curing agent is injected from the curing agent injection hole on one side into the through hole. When injecting, the main body portion is inserted into the through hole from the other side, and the sealing portion closes the opening of the hardener injection hole and the air vent hole on the other side of the wood end surface. The method for connecting reinforcing bars in the temporary opening of the reinforced concrete skeleton according to claim 4.