JP2005336867A - Cast-in-place grout-filled type joint device for deformed bar - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cast-in-place grout-filled-type joint device for a deformed bar simply structured at a low cost by which joining work of the deformed bars is performed more easily and efficiently. <P>SOLUTION: The joint device includes a sleeve-like joint body 11 and a pair of cylindrically shaped fastening members 20 into which the deformed bars A, B are inserted. Each of opening parts at both ends of the joint body 11 is formed to be a tapered threaded opening 17. The fastening members 20 have tapered threaded tubes 22, respectively. The deformed bars A, B are inserted into the fastening members 20, respectively, and the end parts are inserted into the joint body 11. Each of the tapered threaded tubes 22 of the fastening members 20 is screwed into the tapered threaded opening 17 at both ends of the joint body 11, and each of the fastening members 20 is fastened to be fixed to the joint body 11 by the screwing operation. A diameter of the tapered threaded tube 22 of each fastening member 20 is reduced by the screwing pressure so that each of the deformed bars A, B may be fixed to the tapered threaded tube 22. In this state, a mortar C is injected into the joint body 11 through an injection port 13. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-site grout-material-filled deformed reinforcing bar joint device used for joining end portions of deformed reinforcing bars at a building site or the like.

  As a joint device for joining the ends of deformed reinforcing bars, one disclosed in JP-A-11-293851 is known. In this joint device, first, a split inner whose outer peripheral surface is inclined in a tapered shape is applied to the ends of the deformed reinforcing bars to be joined, and this split inner is pressed against the deformed reinforcing bars using a press. Engagement teeth are formed on the inner surface of the split inner, and the engagement teeth bite into the deformed reinforcing bar by pressing with the press machine, and a non-slip groove is formed on the surface of the deformed reinforcing bar.

  Thereafter, the ends of both deformed reinforcing bars are inserted into the tubular joint body from both ends thereof, and push bolts are screwed into the one end side and the other end side of the joint body. The portion of the inner peripheral surface of the joint body corresponding to the divided inner surface is a tapered surface. By rotating the push-in bolt and pushing the divided inner in the axial direction, the pressure contact between the tapered inner surface of the divided inner body and the joint body is achieved. In this structure, both deformed reinforcing bars are fastened to the joint body, and the deformed reinforcing bars are joined together by the joint body. In this joint device, the load applied to one of the deformed reinforcing bars joined is transmitted to the other deformed reinforcing bar through the split inner and the joint body.

  However, in such a joint device, prior to the joining, a split inner is set on the deformed reinforcing bar, and the split inner is crimped to the deformed reinforcing bar with a press machine. In addition, the push bolt is inserted into the joint body, and the split inner is pushed and fastened with the push bolt. Because the load applied to the deformed reinforcing bar is transmitted to the deformed reinforcing bar through the split inner and joint body, the split inner and joint body must have a strong structure, and the overall outer diameter is There is a difficulty to become larger.

  On the other hand, there is generally known a grout-filled joint device that can be constructed on the site relatively easily without using a split inner or push-in bolts and without requiring a press machine. FIG. 3 shows a conventional structure of this grout material filling type coupling device.

  FIG. 3A shows a state before construction of the joint device, and FIG. 3B shows a state after construction. This joint device has a cylindrical joint body 1, and the inside of the joint body 1 is shown in FIG. Protrusions 2 are integrally formed on the peripheral surface, and a grout material injection port 3 is formed on one end side peripheral surface of the joint body 1, and a grout material discharge port 4 is also formed on the other end side peripheral surface. Has been. Further, a stopper 5 is provided at the inner intermediate portion of the joint body 1, and guides 6 are provided near one end and the other end inside the joint body 1, respectively.

  When splicing the deformed reinforcing bars A and B, first, the sealing material 7 made of rubber or the like is attached to the openings at both ends of the joint body 1, and then the joint body 1 is passed through the sealing material 7 from both ends of the joint body 1. Insert the ends of deformed bars A and B into the inside. The inserted deformed reinforcing bars A and B are supported via the guide 6 so that the mutual central axis and the central axis of the joint body 1 coincide with each other.

  Thereafter, fixing bolts 8 are screwed from the outer peripheral surface of the joint body 1, and the deformed reinforcing bars A and B are temporarily fixed by tightening these bolts 8. Under this state, the mortar C as a grout material is injected and filled into the joint body 1 from the injection port 3, and the mortar C is solidified.

  The mortar C filled in the joint main body 1 meshes with the ribs A1 and B1 on the outer peripheral surface of each deformed reinforcing bar A and B and the protrusion 2 on the inner peripheral surface of the joint main body 1, so that one of the deformed reinforcing bars A is applied. The load is transmitted to the other deformed bar B through the mortar C.

In such a joint device, although a slightly long sleeve is required as the joint main body 1, the above-described Japanese Patent Application Laid-Open No. 11-293851 requires the work of meshing the split inner and the deformed reinforcing bar with a press machine. Compared with the joint device of No. 1, it can be constructed on site relatively easily and efficiently.
JP-A-11-293851

  However, in the conventional grout material-filled joint device shown in FIG. 3, the guide 6 for matching the center axes of the deformed reinforcing bars A and B inserted into the joint body 1 and the center axis of the joint body 1. Is provided in the joint body 1 and a fixing bolt 8 for temporarily fixing the deformed reinforcing bars A and B to be inserted is required, and further, leakage of the mortar C filled in the joint body 1 is prevented. The seal material 7 must be attached to both ends of the joint body 1, and therefore the structure is complicated and expensive, and the construction work is troublesome, and higher construction efficiency is desired.

  The present invention has been made paying attention to such points, and the object of the present invention is that the structure is simple and can be constructed at low cost, and the construction for joining deformed reinforcing bars can be performed more easily and efficiently. An object of the present invention is to provide an on-site grout material-filled deformed reinforcing bar joint device.

  The invention according to claim 1 is a sleeve-shaped joint body having a grout injection port on a part of its peripheral surface, and a tubular shape that can be attached to openings at both ends of the joint body and into which deformed bars can be inserted. A pair of fastening members, and the opening at both ends of the joint body has a taper screw hole in which the diameter is gradually reduced toward the intermediate part of the joint body and a screw is formed on the inner peripheral surface thereof. Each of the fastening members has tapered taper screw cylinders corresponding to the taper screw holes at both ends of the joint body, and one and the other deformed reinforcing bars to be joined together are attached to the one and other fastening members. And inserting the end portions of one and the other deformed reinforcing bars into the joint body through the taper screw holes at both ends of the joint body, and inserting the respective tapered screw cylinders of the one and the other fastening members into the joint body. Both ends Screw into the taper screw port, and fasten and fasten each fastening member to the joint body by the screwing, and reduce the diameter of the taper screw cylinder of each fastening member with the screwing pressure, and fix each deformed reinforcing bar to the taper screw cylinder. In this state, the grout material is injected and filled in the joint body through the grout material injection port.

  The invention of claim 2 is characterized in that a protrusion is integrally formed on the inner peripheral surface of the joint body.

  According to a third aspect of the present invention, a notch groove extending along the axial direction is formed in the taper screw cylinder of each fastening member, and the taper screw cylinder is screwed into the taper screw hole of the joint body based on the notch groove. The taper screw cylinder is reduced in diameter by the pressure of and the deformed reinforcing bar is gripped and fixed.

  According to a fourth aspect of the present invention, the taper screw cylinder of each fastening member is formed of an elastic material, and based on the elasticity, the taper screw cylinder is formed by pressure when the taper screw cylinder is screwed into the taper screw port of the joint body. It is characterized by gripping and fixing deformed reinforcing bars by reducing the diameter.

  According to the present invention, the fastening member fixes the deformed reinforcing bars to the joint body, and the aligning means for matching the center axes of the deformed reinforcing bars and the center axis of the joint bars with the center axis of the joint body. It functions as a sealing means that seals the openings at both ends of the joint body. Therefore, the structure can be simple and inexpensive, and the construction work for joining the deformed reinforcing bars can be performed more easily and efficiently.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

  1 (A) and 1 (B) sequentially show the procedure for joining deformed reinforcing bars A and B. The joint device of this embodiment has a sleeve-like joint body 11, and the inner periphery of this joint body 11 is shown in FIG. A protrusion 12 is integrally formed on the surface, and a grout material inlet 13 is formed on the peripheral surface of one end of the joint body 11, and a grout material discharge port 14 is formed on the peripheral surface of the other end. In addition, a stopper 15 is provided at an internal intermediate portion of the joint body 11.

  The openings on both end surfaces of the joint body 11 are tapered screw holes 17 each having a taper shape with a diameter gradually decreasing toward the intermediate part of the joint body 11 and having a screw formed on the inner peripheral surface thereof.

  In addition, the joint device includes a pair of fastening members 20 that can be attached to the taper screw holes 17. These fastening members 20 are made of metal or relatively hard plastic. As shown in FIG. 2, each fastening member 20 has a cylindrical shape as a whole, one end side in the axial direction is a nut-shaped polygonal portion 21, and the other end side is a tapered cylindrical shape corresponding to the tapered screw port 17, and its outer periphery. A taper screw cylinder 22 is formed with a screw formed on the surface. In addition, one or a plurality of cut grooves 24 extending in the axial direction from the front end edge are formed on the peripheral surface of the tapered screw cylinder 22. In the present embodiment, three cut grooves 24 are formed equally.

  When joining the deformed reinforcing bars A and B, first, the deformed reinforcing bars A and B are respectively inserted into the fastening members 20 as shown in FIG. In this embodiment, ribs A1 and B1 extending in a spiral manner are integrally formed on the outer peripheral surfaces of the deformed reinforcing bars A and B.

  After inserting the deformed reinforcing bars A and B into the fastening member 20, the ends of the deformed reinforcing bars A and B protruding from the fastening member 20 are respectively inserted into the joint body 11 from the taper screw holes 17 at both ends of the joint body 11. While inserting, the taper screw cylinder 22 of each fastening member 20 is inserted in the taper screw port 17, respectively. And each fastening member 20 is rotated using a tool etc., and the taper screw cylinder 22 is screwed in the taper screw port 17. FIG.

  As shown in FIG. 1B, the fastening member 20 is fastened and fixed to the taper screw port 17 according to this screwing, and the taper screw cylinder 22 is deformed so as to be elastically reduced in diameter by the narrowing of the cut groove 24. In this deformation, the deformed reinforcing bars A and B are clamped and fixed to the fastening member 20 by the inner peripheral surface of the tapered screw cylinder 22. As a result, the center axes of the deformed reinforcing bars A and B coincide with each other, the center axes of the deformed reinforcing bars A and B coincide with the center axis of the joint body 11, and the openings at both ends of the joint body 11, that is, The taper screw port 17 is closed by the fastening member 20.

  Thus, after attaching the deformed reinforcing bars A and B to the joint body 11 via the fastening members 20, the mortar C as a grout material is injected and filled into the joint body 11 from the inlet 13 and the mortar C is filled. Solidify.

  The mortar C filled in the joint main body 11 meshes with the ribs A1 and B1 on the outer peripheral surface of each deformed reinforcing bar A and B and the protrusion 12 on the inner peripheral surface of the joint main body 11, whereby the load applied to one deformed reinforcing bar A Is transmitted to the other deformed reinforcing bar B through the mortar C.

  Thus, in the joint device of the present embodiment, the fastening member 20 matches the fixing means for fixing the deformed reinforcing bars A and B to the joint body 11 and the center axes of the deformed reinforcing bars A and B, and the center thereof. It functions as an alignment means for aligning the shaft with the central axis of the joint body 11, and a sealing means for sealing the openings at both ends of the joint body 11, so that the guide 6 of the conventional joint device shown in FIG. The fixing bolt 8 is not required and the structure becomes simple. Therefore, the structure can be constructed at low cost, and the deformed reinforcing bars A and B are set in the joint body 11 simply by screwing the fastening member 20 into the taper screw port 17 of the joint body 11. Therefore, the construction work is facilitated, and the work efficiency of the construction is further improved.

  In the above-described embodiment, the cut groove 24 is formed in the taper screw cylinder 22 of the fastening member 20, and the taper screw cylinder 22 is screwed into the taper screw port 17 of the joint body 11 based on the cut groove 24. The deformed rebars A and B are gripped and fixed by reducing the diameter of the taper screw cylinder 22 with pressure. However, if the taper screw cylinder 22 is formed of a material such as resin or rubber having an appropriate elasticity, a cut groove is formed. It is also possible to grip the deformed reinforcing bars A and B by reducing the diameter of the tapered screw cylinder 22 based on its elasticity without providing it.

  If the taper screw cylinder 22 is formed of a material such as resin or rubber having appropriate elasticity, the taper screw cylinder 22 is brought into close contact with the taper screw port 17 or the deformed reinforcing bars A and B according to the screwing, The sealing performance with respect to the taper screw port 17 of the joint body 11 is further improved.

Sectional drawing which shows the deformed rebar joint apparatus which concerns on one Embodiment of this invention. The perspective view which shows the external appearance of the fastening member in the joint apparatus. Sectional drawing which shows the conventional deformed rebar joint apparatus.

Explanation of symbols

A, B ... deformed reinforcing bar A1, B1 ... rib C ... grout material 11 ... joint body 12 ... projection 13 ... grout material injection port 14 ... grout material discharge port 17 ... taper screw port 20 ... fastening member 21 ... polygonal part 22 ... taper Screw cylinder 24 ... Infeed groove

Claims (4)

A joint body having a sleeve shape and having a grout injection port on a part of its peripheral surface, and a pair of fastening members having a cylindrical shape that can be attached to openings at both ends of the joint body and into which deformed reinforcing bars can be inserted With
The opening at both ends of the joint body is a taper screw hole in which a screw is formed on the inner peripheral surface in a tapered shape gradually reducing the diameter toward the intermediate part of the joint body,
Each of the fastening members has a tapered taper screw cylinder corresponding to the taper screw holes at both ends of the joint body,
One and the other deformed reinforcing bars to be joined are inserted into the one and the other fastening members, respectively, and the ends of the one and the other deformed reinforcing bars are inserted into the joint body through the taper screw holes at both ends of the joint body. Then, the respective tapered screw cylinders of the one and the other fastening members are screwed into the taper screw ports at both ends of the joint body, and the fastening members are fastened and fixed to the joint body by the screwing. The diameter of the taper screw cylinder is reduced and each deformed reinforcing bar is fixed to the taper screw cylinder, and in this state, the grout material is injected and filled into the joint body through the grout material injection port. Grout material filled deformed bar joint device.   2. The grout material filling type deformed reinforcing bar joint device according to claim 1, wherein a protrusion is integrally formed on an inner peripheral surface of the joint body.   The taper screw cylinder of each fastening member is formed with a cut groove extending along the axial direction, and based on this cut groove, the taper screw cylinder is pressured by the pressure when the taper screw cylinder is screwed into the taper screw port of the joint body. The deformed reinforcing bar joint device according to claim 1 or 2, wherein the deformed reinforcing bar grips and fixes the deformed reinforcing bar.   The taper screw cylinder of each fastening member is formed of an elastic material, and based on the elasticity, the taper screw cylinder is reduced in diameter by the pressure when the taper screw cylinder is screwed into the taper screw port of the joint body, and the deformed reinforcing bar The grout material filling type deformed reinforcing bar joint device according to claim 1 or 2, characterized by gripping and fixing.

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