JP2009203669A - Joint for reinforcement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem of conventional joints wherein a grout material filling operation is needed. <P>SOLUTION: Two screw holes 2, 2a having respective spiral grooves 3, 3a which have the same pitch as the threads M, Ma of screw-knotted reinforcements T, Ta and shallower than 1/2 of the length of a joint body are coaxially formed in both end surfaces of the laterally elongated joint body 1. The two screw-knotted reinforcements T, Ta are screwed into the screw holes 2, 2a of a joint for reinforcement in which the portion thereof between the two screw holes 2, 2a is used as the contact wall part 4 of the screwed end parts E, Ea of the screw-knotted reinforcements T, Ta so as to project from the contact wall part 4. The two screw-knotted reinforcements are further screwed with a fastening tool such as a wrench to tightly attach the threads M, Ma on the screw-knotted reinforcements T, Ta side to the side surfaces 7, 7a on the spiral groove 3, 3a side by a resiliency from the contact wall part 4. Since the screw-knotted reinforcements T, Ta are formed integrally with each other, the grout material is not needed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a joint for reinforcing bars that connects two threaded reinforcing bars embedded in reinforced concrete.

  Conventionally, as a joint for reinforcing bars that connects two screw-type reinforcing bars in a straight line, the outer shape is cylindrical or hexagonal, and a screw hole is penetrated inside, and the grout material filling from the outer surface to the screw hole is used. The injection hole is generally drilled, and after screwing in from the both ends of the screw hole of the joint for reinforcing bars until the ends of the two screw fistulas are close to the center, grout material is screwed into the screw hole from the injection hole. And a screw-fushi reinforcing bar (for example, see Patent Documents 1 and 2).

Japanese Patent No. 3807604 (Claim 1, FIG. 1-2) Japanese Patent No. 3817340 (Claim 1, FIG. 3)

  However, in the above prior art, it is necessary to inject the grout material, or after placing the concrete on the formwork in a state where it is attached to one screw fushi reinforcement, After that, even if the other reinforcing bar cannot be screwed in, the injection hole is blocked and the grout material cannot be injected, so that there is a problem to be solved such that it cannot be used for embedding.

  In view of the problem that the grout material injection work based on the above-mentioned conventional technique and the problem that it cannot be used for embedding, the present invention is provided on both end faces of the horizontally long joint body from 1/2 the length of the joint body. Two shallow screw holes having a spiral groove having the same pitch as the screw thread of the screw-fushi rebar are arranged and drilled on the coaxial line, and the part between the two screw holes is brought into contact with the screwed end of the screw-fushi rebar. Reinforced force from the abutting wall by screwing two screw-in reinforcing bars into the threaded hole of the reinforcing bar joint as a wall and projecting it on the abutting wall, and then further screwing with a tightening tool such as a wrench By screwing the screw thread rebar side tightly to the side surface of the spiral groove and integrating it, the grout material is unnecessary, and when embedding is used, the other screw hole is closed in advance with a lid, and the concrete is placed. Can be handled by removing the lid later Te, to solve the above-mentioned problems.

In short, in the present invention, two screw holes having a spiral groove having the same pitch as the thread of the screw-fushi rebar are disposed on both ends of the horizontally long joint body on the coaxial line. The entire screw thread of the part can be brought into contact with the side surface of the spiral groove of the screw hole, and the two screw holes are made shallower than 1/2 of the length of the joint body, and the screw fistula reinforcing bar is interposed between them. Since the abutting wall portion at the end of the screw is formed, the tip of the screw fistula rebar screwed into the screw hole can abut against the abutment wall portion to completely prevent further screwing. In both cases, the necessary screwing amount can be surely secured.
In addition, by screwing in after contact, the thread on the side of the threaded reinforcing bar can be tightly brought into close contact with the groove wall on the spiral groove side by the repulsive force from the contact wall, so that no grout material is injected. However, since it can be integrated with the threaded steel reinforcing bar, it is not necessary to form the conventional grout material injection hole and grout material injection work, so it is embedded to expose the other end side of the joint surface. Moisture containing concrete components that have penetrated into one screw hole even if they are buried, so-called “NORO”, can be prevented from entering the other screw hole by the contact wall portion. For this reason, the practical effect such as being able to save labor in the pre-processing work at the time of connecting the other threaded reinforcing bar is significant.

An embodiment of the present invention will be described below with reference to the drawings.
1 and 2 are a front view and an XX cross-sectional view of a joint for reinforcing bars according to the present invention. As shown in FIG. 3, two pieces for embedding reinforced concrete having threads M and Ma projectingly formed on the surface. Attach the above-mentioned joint for reinforcing bar to both ends E and Ea of the threaded reinforcing bar T and Ta, and connect the ends E and Ea of the threaded reinforcing bar T and Ta at the construction site to cast concrete. Then, the screw-fushi reinforcing bars T and Ta connected in the reinforced concrete are embedded.

In the reinforcing bar joint according to the present invention, as shown in FIGS. 1 and 2, both end portions E and Ea of the two threaded reinforcing bars T and Ta are provided in both directions at the center of both end surfaces of the tubular joint body 1. Two screw holes 2 and 2a to be inserted are provided, and spiral grooves 3 and 3a in which the screw threads M and Ma of the screw reinforcing bars T and Ta can be loosely fitted on the inner peripheral surface of the joint body 1 on the screw holes 2 and 2a side. And the pitch of the spiral grooves 3 and 3a is set to the same pitch as the screw threads M and Ma of the threaded reinforcing bars T and Ta.
The two screw holes 2 and 2a are arranged on the same coaxial line and are shallower than ½ of the length L of the joint body 1, and between them, both end portions E and T A contact wall portion 4 of Ea is formed.

  Further, the outer shape of the joint body 1 is generally a circumferential surface portion 5 and only both end portions are hexagonal surface portions 6 and 6a for a tightening tool.

Next, the connection method and operation by the reinforcing bar joint according to the present invention will be described.
(1) The rebar joint is screwed into one screw-fushi rebar T so that the end E of one screw-fushi rebar T is screwed into one screw hole 2 in the rebar joint (FIG. 4A). FIG. 4B).
(2) At the time when the end E of one threaded reinforcing bar T protrudes from the abutting wall part 4, a tightening tool is set on one hexagonal face part 6 of the reinforcing bar joint and tightened (FIG. 4B). (Refer FIG.4 (c)).
(3) The other screw hole 2a in the above-mentioned reinforcing bar joint is screwed with the end Ea of the other screw-type reinforcing bar Ta, and the above-mentioned reinforcing bar joint is screwed into the other screw-type reinforcing bar Ta (FIG. 5A). (Refer FIG.5 (b)).
(4) At the time when the end Ea of the other threaded reinforcing bar Ta projects from the abutting wall part 4, the other threaded reinforcing bar Ta is tightened with a tightening tool (see FIGS. 5B and 5C). .

Next, the connection method and operation in the case of embedding in the joint of the reinforcing bar joint will be described.
(1a) Same as step (1) above.
(2a) Same as step (2) above.
(3a) After covering the other screw hole 2a in the above-mentioned joint for reinforcing bars with the cover C, the concrete is placed, and after curing and curing of the concrete, it is demolded and the cover C is removed from the other screw hole 2a (FIG. 6). (See (a)).
(4a) Same as step (3) above (see FIGS. 6 (a) and 6 (b)).
(5a) Same as step (4) above (see FIGS. 6B and 6C).

  Then, at the time of the steps (2), (2a) and at the steps (4), (5a), the thread M of the screw fistors T, Ta that are loosely fitted into the spiral grooves 3, 3a in the reinforcing bar joint, Sides N and Na opposite to the ends E and Ea side of Ma are in close contact with the screw holes 2 of the spiral grooves 3 and 3a, and the side surfaces 7 and 7a on the opening side of the spiral grooves 3 and 3a, and further screw screw rebars T and Ta are screwed in. As a result, the degree of adhesion is further increased by the repulsive force from the abutting wall portion 4 and is integrated with the threaded reinforcing bars T and Ta.

  In particular, in the construction method shown in FIGS. 6 (a) to 6 (c), moisture containing a concrete component, so-called “NORO”, penetrates into one screw hole 2 of the reinforcing steel joint in an embedded state. However, the contact wall portion 4 does not enter the other screw hole 2a.

It is a front view of the joint for reinforcing bars which concerns on this invention. It is XX sectional drawing of FIG. FIG. 2 is a cross-sectional view showing a state where two threaded reinforcing bars are connected by the reinforcing bar joint of FIG. 1. It is sectional drawing which shows the state before screwing in of the one screw fistula rebar in the splicing process by the reinforcing bar joint of FIG. It is sectional drawing which shows the state at the time of contact | abutting to the contact wall part of one screw fistula reinforcement in the splicing process by the joint for reinforcing bars of FIG. It is sectional drawing which shows the state at the time of fastening of one screw fistula reinforcement in the splicing process by the joint for reinforcing bars of FIG. It is sectional drawing which shows the state before screwing of the other screw fistula reinforcement in the splicing process by the joint for reinforcing bars of FIG. It is sectional drawing which shows the state at the time of contact | abutting to the contact wall part of the other screw-fushi reinforcement in the splicing process by the reinforcement joint of FIG. It is sectional drawing which shows the state at the time of fastening of the other screw fistula reinforcement in the splicing process by the reinforcing bar joint of FIG. It is sectional drawing which shows the state before screwing in the other screw fistula reinforcement in the splicing process in the state embedded by the reinforcing bar joint of FIG. It is sectional drawing which shows the state at the time of contact | abutting to the contact wall part of the other screw fistula reinforcement in the splicing process in the state embedded by the reinforcing bar joint of FIG. It is sectional drawing which shows the state at the time of fastening of the other screw fistula reinforcement in the splicing process in the state embedded by the reinforcement joint of FIG.

Explanation of symbols

1 Joint body 2, 2a Screw hole 3, 3a Spiral groove 4 Abutting wall T, Ta Screw fistula M, Ma Thread E, Ea End

Claims (1)

  Two screw holes having a spiral groove having the same pitch as the screw thread of the screw-fushi rebar, which are shallower than 1/2 of the length of the joint body, are arranged on the coaxial line on both end faces of the horizontally long joint body. A joint for reinforcing bars, characterized in that the portion between the two screw holes is a contact wall portion of a screwed end portion of the screw fistula reinforcing bar.

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