JP2004278219A - Joint metal fitting for steel threaded bar - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint metal fitting for threaded steel bar capable of connecting the bars even if a mis-alignment of the bar or a misaligned pitch is caused by improving the screw thread of a joint metal fitting for reinforcements butt-joining mutual steel threaded bars. <P>SOLUTION: The joint metal fitting is constituted to add a bonding force of mortar to a mechanism depending on the shearing force of steel, in the butt-joint of the mutual threaded steel bars. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The invention of this application relates to a joint for a threaded reinforcing bar for butt-joining reinforcing bars in a reinforced concrete structure or a steel reinforced concrete building.
[0002]
[Prior art]
The conventional threaded rebar joint is a mechanism that meshes the rebar bar with the barb of the joint and mainly depends on the shearing force of the iron. It is designed, and there is a problem that it is difficult to perform the work if a center shift or a pitch shift occurs.
[0003]
The joint fitting shown in FIG. 5 is a conventional example, in which a threaded reinforcing bar 112 is butt-joined by a threaded reinforcing bar fitting fitting 111 using a grout material. A thread 113 is provided on the inner peripheral surface, and a grout is provided at the center of the outer peripheral surface. This is a method in which a material injection hole 114 is provided, and a threaded reinforcing bar 112 screwed from both ends in the axial direction is connected and fixed via a grout material 115 injected into the inside from the injection hole 114.
The thread 113 provided on the inner peripheral surface of the threaded reinforcing bar fitting 111 has a trapezoidal cross section, and the threaded reinforcing bar 112 screwed into the fitting has a similar trapezoidal cross section. The gap when screwing reinforcing bar 112 was screwed into metal fitting 111 was small, and grouting was not easy.
[0004]
Further, even if the phases of the threads at the tips of the two threaded rebars to be joined do not match, the two threaded rebars can be joined close to each other, and even if the pitches of the two threaded rebars to be joined are slightly different. As a fitting for threaded reinforcing bars that can be screwed and joined,
A screw thread provided with a screw thread on the inner peripheral surface and a grout material injection hole in the center of the outer peripheral surface, and a screw reinforcing bar screwed in from both ends in the axial direction is connected and fixed by the grout material filled inside from the grout material injection hole. A joint for a reinforcing bar, wherein the width of at least the hook height portion of the thread is reduced so that the width of the crest is 15% or less of the pitch while keeping the inclination angle on both sides unchanged. is there.
However, since the thread metal has a triangular shape from a trapezoidal shape, this thread fitting can be used for pitch deviation and the like, but not for core deviation.
[0005]
[Problems to be solved by the invention]
The invention of this application is based on the idea that the screw thread of the joint metal fitting for threaded rebar for butting and joining opposing rebars can be joined even if the core displacement or pitch deviation of the threaded rebar occurs. It is an object of the present invention to provide a reinforcing metal fitting.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the invention of this application is based on the fact that the butt joint between reinforcing bars by means of a screw-in rebar joint fitting is performed by adding the adhesive force of mortar to a mechanism relying on the shear force of iron. It is something that improved.
[0007]
A specific configuration 1 is that an annular internal projection is provided at predetermined intervals on the inner peripheral surface of a hollow cylindrical main body having openings at both ends, and a thread which is higher than the height of the thread reinforcing steel and is partially cut out. And a joint fitting for a screw bar.
[0008]
The specific configuration 2 is characterized by a joint metal fitting for a screw rebar in which a grout material injection hole and a discharge hole are provided in a hollow cylindrical main body.
[0009]
The concrete configuration 3 is characterized in that a partially cut-out thread is provided on one side, which is one opening side, and the other opening side is characterized by a joint metal fitting for a screw rebar which is grout-filled. is there.
[0010]
The concrete configuration 4 is characterized in that the partially cut-out screw thread is provided with a joint metal fitting for a screw bar provided at a part of both opening sides.
[0011]
The specific configuration 5 is characterized by a joint metal fitting for a threaded reinforcing bar provided with means for temporarily fixing a reinforcing bar to a hollow cylindrical main body.
[0012]
The concrete configuration 6 is characterized in that the outer surface shape of the hollow cylindrical main body is a column, a prism or a cone, and further, a joint metal fitting for a screw rebar provided with reinforcing means by a fin or a ring.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
The invention of this application will be described based on an embodiment shown in the drawings.
[0014]
Embodiment 1
FIG. 1a is a longitudinal sectional view of the fitting metal fitting 1 for a thread-reinforcing bar, and FIG. 1b is a vertical sectional view of FIG. 1a. 3 are formed, and an injection hole 4 and a discharge hole 5 for grout material are provided.
[0015]
The cross-sectional area of the annular internal projection 3 is smaller than that of the conventional joint, and is formed so as to cross the internal projection 3 and to be higher than the height of the barn 7 of the screw bar 6. A screw thread 8 is formed on the inner peripheral surface of 2.
The thread 8 formed on the inner peripheral surface of the hollow cylindrical main body 2 is not provided with a single projected area in the 360-degree direction, but is formed in a partially cut-out shape.
[0016]
FIG. 2 is an internal perspective view of the threaded reinforcing bar fitting 1 cut out, and annular internal projections 3 are formed at predetermined intervals on the inner peripheral surface of the hollow cylindrical main body 2. The screw thread 8 is formed so as to cross the inner projection 3 and to be slightly higher than the height of the internal projection 3.
The vertical sectional view of FIG. 1b shows the rebar joint fitting 1 in which a thread 8 is provided on the inner peripheral surface of the hollow cylindrical main body 2 at a height slightly higher than the height of the annular internal projection 3. ing.
[0017]
In the joint metal fitting 1 for a thread-reinforcing bar shown in FIG. 1a, an annular inner projection 3 and a screw thread 8 are formed on one inner peripheral surface (right half in the drawing) which is one opening side, and the other opening is formed. On one inner peripheral surface (left half in the drawing), which is the part side, only an annular internal projection 3 is provided, and a threaded steel bar joint fitting 1 composed of a threaded steel bar joint and a grout-filled joint is provided. This is a so-called "single-tube type joint").
[0018]
According to the invention of this application, for example, a joint metal fitting 1 for a threaded reinforcing bar is attached to a butt portion of a reinforcing bar at a joint of a reinforced concrete beam, a grout material is injected from an injection hole 4 provided in a side wall of the joint metal fitting 1, and a discharge hole is provided. By confirming that the grout material overflows from No. 5, it can be confirmed whether or not the grout material has been completely filled, and the reinforcing bars are joined together by the hardening of the grout material.
As the grout material, for example, a material made of an inorganic material or an organic material such as an epoxy resin, a silicone resin, a polyethylene resin, and a high-strength cement is used.
[0019]
In order to improve workability, bolt holes 9 are provided near both ends of the threaded reinforcing bar joint fitting 1, and a bolt is screwed into the bolt hole 9 to be inserted into the threaded reinforcing bar joint fitting 1. The rebar can be fixed in a stable state, and the grouting material can be easily injected.
In addition, a grout material can be prevented from leaking by attaching a sealing material to the outside of the rebar insertion opening of the screw-in rebar joint fitting 1 by, for example, screwing.
[0020]
Embodiment 2
FIG. 3a is a longitudinal sectional view of the fitting metal fitting 11 for the screw reinforcement, and FIG. 3b is a vertical sectional view of FIG. 3a. The inner peripheral surface of the hollow cylindrical main body 2 has annular internal projections at predetermined intervals. 3 are formed, and an injection hole 4 and a discharge hole 5 for grout material are provided.
[0021]
The cross-sectional area of the annular internal projection 3 is smaller than that of the conventional joint, and is formed so as to cross the internal projection 3 and to be higher than the height of the barn 7 of the threaded reinforcing bar 6. The thread 8 is formed on the inner peripheral surface of.
The thread 8 formed on the inner peripheral surface of the hollow cylindrical main body 2 is not provided with a single projected area in the 360-degree direction, but is formed in a partially cutout shape.
[0022]
The threaded joint 11 for a threaded reinforcing bar shown in FIG. 3A is formed by a threaded joint having an annular internal projection 3 and a thread 8 formed on an inner peripheral surface within a predetermined range from both openings. It is shown.
In the same manner as in Example 1, for example, the joint metal fitting 11 for threaded reinforcing steel is attached to the joint of the reinforcing steel at the joint of the reinforced concrete beam, and the grout material is injected from the injection hole 4 provided in the side wall of the fitting 11. The hardening of the grout material joins the reinforcing bars.
[0023]
The outer surface shape of the hollow cylindrical main body 2 forming the screw fittings 1 and 11 is preferably a cylinder, a prism, or a cone, but is not limited thereto.
Further, a fin or a ring may be provided on the outer peripheral surface of the hollow cylindrical main body 2 in order to reinforce the screw fittings 1 and 11.
[0024]
FIG. 4 is a cross-sectional view showing the relationship between the thread reinforcing bar 6 screwed into one opening side (half of the thread reinforcing bar joint fitting) of the thread reinforcing bar fittings 1 and 11 and the thread reinforcement joint. is there.
The distance between the inner peripheral surfaces of the screw fittings 1 and 11 and the thread 8 of the screw reinforcing bar 6 is increased, and the projected area of one thread of the hollow cylindrical main body 2 is 360 °. Instead, it has a partially cut-out structure.
[0025]
【The invention's effect】
In the invention of this application, since the relationship between the thread rebar and the thread reinforce joint has the above-described structure, it can sufficiently cope with a core displacement or a pitch displacement depending on the diameter, the rein height and the rein pitch of the rebar to be manufactured. can do.
Although the thread of the hollow cylindrical main body is cut, the joining is strengthened by the annular inner protrusion provided near the thread and the grout material.
Further, since the distance between the inner peripheral surface and the thread of the hollow cylindrical main body and the barb of the screw bar is increased, the grout material can be easily filled and the workability is good.
[Brief description of the drawings]
FIG. 1 (a) is a longitudinal sectional view of a fitting metal fitting for a screw rebar.
(B) It is a perpendicular sectional view of the joint metal fittings for screw rebar.
FIG. 2 is an internal perspective view of the joint metal fitting for the screw rebar.
FIG. 3 (a) is a longitudinal sectional view of a joint fitting for a screw rebar.
(B) It is a perpendicular sectional view of the joint metal fittings for screw rebar.
FIG. 4 is a cross-sectional view showing a relationship between a screw-in rebar and a screw-in joint. FIG. 5 is a cross-sectional view showing a joint part using a conventional screw-in bar joint fitting.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Joint metal fitting for screw rebar 11 ... Joint metal fitting for screw rebar 2 ... Hollow tubular main body 3 ... Internal protrusion 4 ... Injection hole 5 ... Discharge hole 6 ... Grout Material 7: Thread 8: Thread 9: Bolt hole 111, Threaded reinforcing bar fitting 112, Threaded reinforcing bar 113, Thread 114, Injection hole 115, Grout material

Claims (6)

Pertaining to a joint fitting for butt-joining rebars, the inner peripheral surface of a hollow cylindrical main body having openings at both ends, annular internal protrusions at predetermined intervals, and a height higher than the barb height of the screw bar, A fitting for a threaded reinforcing bar, wherein a notched thread is provided. The joint fitting for a screw bar according to claim 1, wherein a grout material injection hole and a discharge hole are provided in the hollow cylindrical main body. 3. A filling method in which a partially cut-out thread is provided on one side which is one opening side, and one side on the other opening side is a filling method of joining by injecting grout material. Screw fittings for screw reinforcement as described. The joint fitting for a reinforcing bar according to claim 1, wherein the partially cut thread is provided in a part on both sides of the opening. The joint fitting for a screw bar according to any one of claims 1 to 4, wherein a means for temporarily fixing the reinforcing bar is provided in the hollow cylindrical main body. The joint fitting for a screw bar according to any one of claims 1 to 5, wherein the outer surface of the hollow cylindrical body has a cylindrical shape, a prism shape, or a conical shape.

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