JP4897208B2 - Sleeve rebar joint structure - Google Patents

Description

The present invention relates to a sleeve-type reinforcing bar joint structure in which opposing reinforcing bars are joined together in a sleeve.

  Conventionally, there are various techniques for connecting opposing reinforcing bars within a sleeve, and as shown in FIG. 5, a pair of reinforcing bars to be connected from both left and right openings of a cylindrical sleeve reinforcing bar fitting A B is inserted into the joint fitting A in a loosely fitted state from each opening, and is made to butt or face in a state close to or substantially in the center of the joint fitting A, and is generated between the joint fitting A and the reinforcing bar B. There has been known a technique for obtaining an integrally and continuously extending reinforcing bar by injecting, filling, and solidifying a space C having a high fluidity material such as mortar.

As shown in FIG. 5, the above-mentioned type of fitting A is provided with a plurality of continuous annular projections D on the inner wall surface of the fitting A to increase the adhesive force with the filler packed in the space, and the reinforcing bar B The resistance force for preventing the movement of is increased.
Japanese Utility Model Publication No. 63-186818

  As described above, since the means for obtaining the fixing force of a predetermined reinforcing bar in the joint metal fitting is only the filler and the protrusion provided on the inner wall surface of the joint metal fitting, it is necessary to make the joint fitting a long member in order to continue the reinforcing bar. was there.

The present invention increases the fixing force between the filler filled in the joint and the reinforcing bar by forming a bulging part thicker than the reinforcing bar diameter at the end of the reinforcing bar, thereby increasing the length of the joint. The present invention provides a sleeve-type reinforcing bar joint structure that can be significantly shortened.
In addition, by forming the joint structure at the end portion of the member, a connection structure between the members is provided by a sleeve-type reinforcing bar joint structure in which the members are integrated by a reinforcing bar.

The present invention relates to a sleeve-type rebar joint structure in which the respective reinforcing bars to be connected are inserted from both openings of the sleeve-type rebar joint surrounded by left and right openings and a side wall having a space between both openings. In each of the above, a bulge that can be inserted from the opening at the tip of the reinforcing bar and has a diameter that is at least 30% larger than the diameter of the reinforcing bar is formed. At least 2.5 mm or more generated between the inner surface of the side wall in the space part and the reinforcing bar and the peripheral wall of the bulging part. It features a sleeve-type reinforcing bar joint structure in which a continuous gap is filled with a filler.

Further, the present invention is characterized by a sleeve-type reinforcing bar joint structure in which an uneven portion is formed on a wall that becomes an inner surface of the side wall of the space portion .

  Furthermore, the bulging part is characterized by a sleeve-type reinforcing bar joint structure formed by crushing the end part of the reinforcing bar from the axial direction.

  Further, the present invention is characterized by a sleeve-type reinforcing bar joint structure in which the bulging part is a nut and is screwed into a screw at a reinforcing bar end or welded to the reinforcing bar end.

  Further, the present invention is characterized by a sleeve-type reinforcing bar joint structure in which the bulging portion is a steel pipe, and the steel pipe is fitted and welded to the end of the reinforcing bar.

  In addition, a sleeve-type reinforcing bar joint is embedded in a member end portion on one side of a member to be connected in a state where a reinforcing bar is inserted from an opening portion on one side, and the reinforcing bar on the other end of the member facing the joint is connected to the joint end. A member is connected to each other by injecting and integrating a filler into a space portion of a reinforcing bar arrangement that is inserted through the opening on the other side of the joint and is loosely fitted in the joint. It is characterized by a connecting structure of members by the sleeve type reinforcing bar joint structure.

  Further, the whole or almost the entire sleeve-type rebar joint in which the reinforcing bar is inserted from the opening on one side is embedded in the end of the member to be connected, and the other end of the member facing the joint is embedded. The sleeve-type rebar joint is moved while the rebar is inserted from the opening on the other side of the joint, and the space in the rebar arrangement and the space in the member generated by the movement of the joint are filled. 2. A member connecting structure using a sleeve-type reinforcing bar joint structure according to claim 1, wherein the members are connected to each other by injecting and integrating materials.

  In the sleeve-type reinforcing bar joint structure of the present invention, since the bulging part is provided at the tip of the reinforcing bar, the filling material packed in the space formed between the inner wall of the joint and the reinforcing bar, the bulging part, the lid part, etc. Anchors were formed, and the fixing power was greatly increased. This makes it possible to shorten the overall length of the joint.

  In addition, by adopting the sleeve-type reinforcing bar joint structure of the present invention in the connection part between the precast members, the connection between the precast members is simplified, and the construction period can be greatly shortened. It became possible to reduce it. As a result, construction costs can be reduced.

  Hereinafter, the present invention will be described based on examples.

  FIG. 1 is a partially cutaway front sectional view of a sleeve-type reinforcing bar joint structure according to the present invention. The sleeve-type reinforcing bar joint structure includes a sleeve-type reinforcing bar joint 1 and a reinforcing bar 2. The sleeve-type reinforcing bar joint 1 is formed by a side wall 3 that forms a cylindrical shape and both left and right openings 4, and the openings 4 surround a part of the opening 4 from the end of the side wall 3. The lid portion 5 is formed so as to be closed. A space 6 is defined between the left and right lids 5.

  Reinforcing bars 2 connected to each other are inserted into the space 6 from both openings 4 side. As the reinforcing bar 2, a normal round steel bar, a deformed reinforcing bar, or the like is used. A bulging portion 7 is formed at the end of the reinforcing bar 2. The bulging portion 7 forms a bump-shaped bulging portion 7 at the end portion by crushing the end portion of the reinforcing bar 2 from the axial direction.

As an example, if the diameter of the reinforcing bar 2 inserted from the opening 4 is D, the diameter of the bulging portion 7 is about 1.4D. The protruding thickness of the bulging portion 7 is about 0.55D.
The opening diameter D1 of both openings 4 of the sleeve-type reinforcing bar joint 1 into which the rebar 2 is inserted is about 1.5 to 1.6 D, and the opening diameter into which the bulging portion 7 of the reinforcing bar 2 can be inserted from both openings 4 is. Let D1.
Furthermore, the distance D2 between the inner surface 3 ′ of the side wall 3 forming part of the space filled with the filler and the bulging portion 7 is at least 2.5 mm.

The length D3 of the rebar 2 on one side inserted into the sleeve-type rebar joint 1 is about 3D.
A distance D4 between the reinforcing bar 2 inserted from one opening 4 and the reinforcing bar 2 inserted from the other opening 4 is about 0 to 30 mm.

  Therefore, the total length of the sleeve-type reinforcing bar joint 1 is about 6 to 7D, although it varies somewhat depending on the diameter of the reinforcing bar.

The rebar 2 is inserted in the space 6 through the left and right openings 4 in a loosely fitted state and disposed in the sleeve-type rebar joint 1 so that they are in contact or close to each other. The space between the inner surface 3 ′ and the reinforcing bar 2 is filled with the filler.
As the filler, inorganic materials such as cement mortar and gypsum, organic materials such as epoxy resin, and metal materials such as molten metal are used.

  FIG. 2 shows another embodiment of the sleeve-type reinforcing bar joint structure according to the present invention, with a front sectional view partially cut away. The sleeve-type reinforcing bar joint structure includes a sleeve-type reinforcing bar joint 11 and a reinforcing bar 12. The sleeve-type reinforcing bar joint 11 includes a side wall 13 forming a cylindrical shape, left and right opening portions 14, a lid portion 15 formed so as to block a part of the opening portion 14 from the surroundings, and a cylindrical inner space portion 16. And more.

  As in the first embodiment, the reinforcing bars 12 are inserted into the space 16 from the left and right openings 14, but the reinforcing bars 12 are screw reinforcing bars. Therefore, the bulging portion 17 can be easily formed by screwing or welding a nut to the end portion of the screw rebar 12.

As an example, when the diameter of the reinforcing bar 12 inserted from the opening 14 is D, the diameter of the bulging portion 17 is about 1.3 to 1.7D. The protruding thickness of the bulging portion 17 is about 1.0 to 1.9D.
The opening diameter D1 of both openings 14 of the sleeve-type reinforcing bar joint 11 into which the rebar 12 is inserted is set to be slightly larger than the diameter of the bulging portion 17, and the bulging portion 17 of the reinforcing bar 12 is inserted from both the opening portions 14. The diameter can be made.
Furthermore, the distance D2 between the inner surface 13 ′ of the side wall 13 forming a part of the space filled with the filler and the bulging portion 17 is at least 2.5 mm.

The length D3 of the reinforcing bar 12 on one side inserted into the sleeve-type reinforcing bar joint 11 is about 1.5D, which is the protruding thickness of the nut.
A distance D4 between the reinforcing bar 12 inserted from one opening 14 and the reinforcing bar 12 inserted from the other opening 14 is set to about 0 to 30 mm.

  Therefore, the total length of the sleeve-type reinforcing bar joint 11 is about 6 to 8D, although it varies somewhat depending on the diameter of the reinforcing bar.

The rebar 12 is inserted in the space 16 through the left and right openings 14 in a loosely fitted state, and is disposed in the sleeve-type rebar joint 11 so that they are in contact with or close to each other. The filler is filled in the space between the inner surface 13 ′ and the reinforcing bar 12.
As the filler, inorganic materials such as cement mortar and gypsum, organic materials such as epoxy resin, and metal materials such as molten metal are used.

  In Examples 1 and 2, by forming irregularities such as annular protrusions on the wall that is the inner surface of the cylindrical body, it is possible to further increase the adhesion with the filler and improve the fixing power. Needless to say.

  FIG. 3 is a plan cross-sectional view of a joint portion between members using the sleeve-type reinforcing bar joint structure of the present invention. The sleeve-type reinforcing bar joint structure includes a sleeve-type reinforcing bar joint 21 and a reinforcing bar 22. The sleeve-type reinforcing bar joint 21 includes a cylindrical side wall 23, left and right openings 24, a lid 25 formed so as to block a part of the openings 24 from the periphery, and a cylindrical inner space. It consists of the part 26.

  The reinforcing bars 22 are inserted into the space 26 from the left and right openings 24 as in the first and second embodiments. A bulging portion 27 is formed at the end of the insertion reinforcing bar 22.

  In the joint structure composed of the sleeve-type rebar joint 21 and the rebar 22 having the above-described configuration, the sleeve-type rebar joint 21 is attached to the end of the member (the end of the concrete beam 28 in this embodiment). The sleeve-type reinforcing bar joint 21 or a part thereof is embedded in the concrete in a state where the reinforcing bar 22 of one beam 28 is inserted into the space part 26 of the joint 21 from the one opening 24. The other opening 24 side of the sleeve-type reinforcing bar joint 21 is exposed from the end of the beam 28, and the exposed sleeve-type reinforcing bar joint 21 is embedded in the end of the other beam 28 ′ to be connected. The '-side rebar 22' is inserted from the other opening 24 and disposed in the space 26 'of the sleeve-type rebar joint 21.

  At the time of connecting the beams 28 and 28 ', the space of the sleeve-type reinforcing bar joint 21 is filled with a filler. Thereafter, the joint 29 is filled to complete a continuous beam.

  In the above embodiment, particularly when connecting the precast concrete beams, a space 30 in which the entire joint 21 can be embedded is formed in the beam 28 on one side (the right side in FIG. 3) in advance. The rebar 22 and the joint 21 are arranged so as to be freely movable (dotted line portion in the figure), and in the space 30 ′ formed on the side of the rebar 22 ′ facing the space 30 in the other beam 28 ′ when the beams are joined. The joint 21 is pulled out from the position of the dotted line and moved to the beam 28 'side. By this drawing, the reinforcing bar 22 ′ of the beam 28 ′ facing the joint 21 enters the space 26 ′ of the joint 21 from the opening 24.

  Thereafter, the filler is filled in the concrete hole formed in the space 30 of the joint 21 and the space 30 of the beam 28 generated by moving the joint 21, and the filler is injected into the joint portion 29. 28 and 28 'are integrated with each other.

  FIG. 4 shows another embodiment of the sleeve-type reinforcing bar joint structure according to the present invention. FIG. 4A is a partially cutaway front sectional view of FIG. 4A, and FIG. The sleeve-type reinforcing bar joint structure includes a sleeve-type reinforcing bar joint 41 and a reinforcing bar 42. The sleeve-type reinforcing bar joint 41 includes a side wall 43 forming a cylindrical shape, a female screw 48 engraved on the inner side surfaces of both the left and right openings 44, and a screw body 45 engraved with a male screw 49 threaded on the outer side surface. And a cylindrical inner space 46, and the screw body 45 is screwed into a female screw 48 engraved on the inner side of the opening 44 so that a protrusion is formed on the inner surface of the opening 44. It is formed.

  Reinforcing bars 42 connected to each other are inserted into the space 46 from both openings 44 side. As the rebar 42, a normal round steel rebar, a deformed rebar, or the like is used. A bulging portion 47 is formed at the end of the reinforcing bar 42. The bulging portion 47 is formed with a bump-like bulging portion 47 at the end portion by crushing the end portion of the reinforcing bar 42 from the axial direction.

The coupling of the reinforcing bars 42 using the sleeve-type reinforcing bar joint 41 will be described. The reinforcing bars 42 are inserted into the space 46 through the left and right openings 44 in a loosely fitted state so that they are in contact with or close to each other. Then, the screw body 45 is attached to the inner side of both openings 44 and the space between the inner side surface of the joint 41 and the reinforcing bar 42 is filled with a filler.
As the filler, inorganic materials such as cement mortar and gypsum, organic materials such as epoxy resin, and metal materials such as molten metal are used. The screw body 45 may be either an integral type or a two-part split type. The two-part screw body 45 is provided with an uneven portion on a mating surface, and the screw body 45 is formed by fitting the uneven portion. .

It is the front sectional view which excised a part of sleeve type rebar joint structure of the present invention. It is front sectional drawing which cut out some sleeve-type reinforcing bar joint structures of other examples of the present invention. It is a sectional side view of a sleeve type reinforcing bar joint structure in the case of connecting concrete members to each other. It is front sectional drawing which cut out some sleeve-type reinforcing bar joint structures of other examples of the present invention. It is front sectional drawing of the conventional sleeve type rebar joint structure.

Explanation of symbols

1, 11, 21, 41 Sleeve type rebar joint 2, 12, 22, 22 '42 Reinforcing bar 3, 13, 23, 43 Side wall 3' Inner surface 4, 14, 24, 44 Opening 5, 15, 25 Lid 6, 16, 26, 26 ', 46 Space 7, 7, 27, 47 Swell 28, 28' Beam 29 Joint 30, 30 'Space 45 Screw body 48 Female thread 49 Male thread

Claims (8)

In the sleeve-type reinforcing bar joint structure in which the respective reinforcing bars to be connected are inserted from the both openings of the sleeve-type reinforcing bar joint surrounded by the left and right openings and the side wall between the openings. Bulges that can be inserted from the opening and have a diameter that is at least 30% larger than the diameter of the reinforcing bar are respectively formed at the tip of each of the spaces, and at least 2 over the entire area between the inner wall of the side wall and the peripheral wall of the bulge A continuous gap of at least 2.5 mm or more generated between the inner wall of the side wall and the reinforcing bar and the peripheral wall of the bulging part. sleeve-type reinforcing bar joint structure characterized by being filled with a filler material.   2. The sleeve-type reinforcing bar joint structure according to claim 1, wherein an uneven portion is formed on a wall that becomes an inner surface of the side wall of the space portion.   The sleeve-type reinforcing bar joint structure according to claim 1, wherein the protruding part is formed inward from the side walls of both openings of the sleeve-type reinforcing bar joint.   The sleeve-type reinforcing bar joint structure according to claim 3, wherein the projecting portion is a lid portion formed so as to block a part of the opening from the periphery from the side wall end portion.   4. The sleeve-type reinforcing bar joint structure according to claim 3, wherein the protruding portion is a screw body having a reinforcing bar insertion hole screwed into a female screw carved inside both openings.   The sleeve-type reinforcing bar joint structure according to any one of claims 1 to 5, wherein the bulging part is formed by crushing an end part of a reinforcing bar from an axial direction.   The sleeve-type reinforcing bar joint structure according to any one of claims 1 to 5, wherein the bulging part is formed of a nut screwed into a screw at a reinforcing bar end part or a nut welded to the reinforcing bar end part. . The sleeve-type reinforcing bar joint structure according to any one of claims 1 to 5, wherein the bulging part is formed of a steel pipe that is fitted into a reinforcing bar end and welded.

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