JPH0444049B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) This invention relates to a reinforcing bar joint for reinforcing bars used in concrete structures.

(Conventional technology) Conventional reinforcing bar joints connect reinforcing bars to sleeve pipes,
This was achieved by inserting a pipe or the like, and then swaging the reinforcing bar from above in the longitudinal direction of the reinforcing bar using a die or the like, thereby crimping and joining them together. However, in such a conventional closed type, continuous processing is required from one end of the reinforcing steel, and it is difficult to process it all at once, and the processing equipment itself is large-scale.
The problem was that it was difficult to work quickly at the work site.

Therefore, it is possible to consider using a plate-shaped body as a reinforcing bar joint material and crimping and fixing it to the reinforcing steel, but in the conventional crimping method, since plate-shaped bodies such as iron plates have ends, the ends are exposed to the repulsive force after crimping. It was thought that this would make the reinforcing bars more likely to peel off from the surface, and that it would require welding such as stop-point welding after crimping, and it was generally thought that reinforcing bar joints would not have sufficient strength, so they were never attempted in practice.

As another conventional example, it is known that reinforcing bars to be joined are inserted into a sleeve pipe and a tightening member such as a wedge, a piece, or a bolt is passed between the reinforcing bars and the sleeve pipe, thereby crimping and joining them together. However, in such conventional examples, crimping between reinforcing bars and reinforcing bar joints relies only on tightening members such as wedges, and the crimping force is not sufficient. This had the problem of requiring a tightening member such as a wedge.

Furthermore, as another conventional example, Japanese Patent Application Laid-Open No. 55-98559
``Rebar joint method using split sleeves'' is known. In this conventional example, a connecting sleeve having a back split in the axial direction is inserted into a butt joint of reinforcing bars to be connected, and an external force is applied from the outer periphery of the sleeve to connect the outer wall of the reinforcing bar and the inner wall of the sleeve. This is a reinforcing bar joint method characterized by crimping.

Furthermore, Utility Model No. 49-118525 ``Rebar'' is also known.
The term "reinforcing bar" refers to "a pair of reinforcing bars that have ribs formed on their outer peripheries and are to be joined to each other, and a joint that connects the reinforcing bars by fitting between the joining ends of the pair of reinforcing bars and crushing them." A reinforcing bar that is tied to a tube.”
Consisting of

(Problems to be Solved by the Invention) In the conventional example "reinforcing bar joint method using split sleeves" disclosed in this Japanese Patent Application Laid-Open No. 55-98559, the sleeve is crimped to the reinforcing bars. Since this method does not form irregularities such as edges, it has the problem that the mechanical adhesion strength on the surface of the joint part is inferior to the mechanical adhesion strength on the surface of the deformed rebar, especially when the rebar is a deformed rebar.

On the other hand, "reinforcing bars" disclosed in Utility Model Application No. 49-118525
In this case, reinforcing bars are connected using a connecting tube and a crimping mold. However, the connection is
Like the reinforcing bars described in 98559, it is covered only in the longitudinal direction of the reinforcing bars, and its purpose is only to connect the reinforcing bars in the longitudinal direction. Therefore, there was a problem that it was not useful for arranging a plurality of reinforcing bars in parallel or the like and connecting the reinforcing bars in the width direction.

That is, conventionally, there has been no reinforcing bar joint that connects a plurality of reinforcing bars arranged in parallel by crimping the connecting ends of the reinforcing bar joint material to the reinforcing bars in the width direction.

(Means for Solving the Problems) This invention connects reinforcing bars arranged in parallel via a flat plate-shaped reinforcing bar joint connection part, and also connects reinforcing bars that are connected to the reinforcing bar joint connection part internally. To provide a reinforcing bar joint whose periphery is tightly attached to the outer periphery of the reinforcing bar and a rim is formed in a direction intersecting the longitudinal direction of the reinforcing bar on the outer periphery.

(Function) In addition to connecting the reinforcing bars arranged in parallel through the flat plate-shaped reinforcing bar joint connecting part, the inner periphery of the connecting part with the reinforcing bar that is continuous with the reinforcing bar joint connecting part is closely attached to the outer periphery of the reinforcing bar. Connects reinforcing bars with strength. In addition, since a border is formed in the direction intersecting the longitudinal direction of the reinforcing bars on the outer periphery, the adhesion strength to concrete to be placed is improved.

(Example) Hereinafter, FIG. 1 shows a perspective view of a reinforcing bar joint crimping mold according to an embodiment of the present invention, and FIG. I will explain accordingly.

1 is a reinforcing bar joint crimping device. Reference numeral 2 denotes an upper die which is a presser type harder than the reinforcing bar joint that is fixed to one of the crimping ends of the reinforcing bar joint crimping device 1, and 3 is a pushing die that is harder than the reinforcing bar joint that is fixed to the other crimping end of the reinforcing bar joint crimping device 1. The lower mold is the mold. Both molds have approximately equal machined surfaces. Since the reinforcing bar joint crimping device 1 has a hydraulic cylinder (not shown) on the upper part of the upper mold 2,
The upper mold 2 can be raised and lowered to a position where it can come into contact with the lower mold 3, and has an output of 30 to 150 tons, preferably 50 to 100 tons.

4 and 4' are deep curved grooves formed in the processing surfaces of the upper die 2 and the lower die 3, respectively. 5 and 5'
are shallow curved grooves bored in the processing surfaces of the upper die 2 and the lower die 3. Deep curved grooves 4, 4' and shallow curved grooves 5,
5' is formed by alternately boring grooves 6, 6' in the longitudinal direction of the reinforcing bars to be installed.

In this embodiment, four shallow curved grooves 5, 5' are bored in the groove parts 6, 6', and three deep curved grooves 4, 4' are formed. Depending on the length of 6, it can be any number such as 1, 2, 5, 8, etc.
In that case, the number of shallow curved grooves 5, 5' is 2, 3,
It becomes 6,9.

The peripheral surfaces of the deep curved grooves 4, 4' and the shallow curved grooves 5, 5' are circular or elliptical. The widths a and b of the deep curved grooves 4 and 4' and the shallow curved grooves 5 and 5' are approximately equal in this embodiment, but a and b may be a<b, but a=b or a>b. This is desirable.

deep curved grooves 4, 4' and shallow curved grooves 5,
Both grooves 5' may have different groove widths. 7,
Reference numeral 7' denotes a reinforcing bar joint end restraining part, which closes both longitudinal ends of the groove parts 6, 6' in a rising shape.

Reference numeral 8 designates side grooves, which are formed in a strip shape along both sides of the grooves 6, 6' in the longitudinal direction at a depth of 0.1 to 5.0 mm from the machined surface. Two grooves are provided parallel to each other in the longitudinal direction of the groove portions 6, 6', and a central groove 11 is formed between the two grooves on the same plane as the side grooves 8.

9a is a reinforcing bar joint connection part in a reinforcing bar joint, 9b
is a fixed part with the reinforcing bar located at the end of the reinforcing bar joint, and 10 is the reinforcing bar. 9a has a flat plate shape. In this embodiment, the reinforcing bars 10 are made of deformed reinforcing bars having ribs and edges, and in the processing of this embodiment, two deformed reinforcing bars arranged in parallel are connected.

Therefore, the sleeve tube fitted into the reinforcing bar 10 is placed in the groove 6' of the lower mold 3. or upper end 1
2 and a cross section approximately W with a curved surface 13 at the bottom
A reinforcing bar joint material 14 made of a letter-shaped iron plate is placed, and a plurality of reinforcing bars are further arranged and installed thereon. Or, reinforcing bar joint material 1 from the top of multiple reinforcing bars installed side by side.
Install 4 more.

The reinforcing bar joint material 14 only needs to be able to form the curved surface 13, and may be in the form of a plate or a tube. Further, if the shape is not tubular, it is desirable that the processed upper end portion 12 faces slightly inward. Both ends 12
The interval is wider than the outer diameter of the reinforcing bars 10, and in that case, the reinforcing bar joint material 14 does not need to be inserted into the reinforcing bars 10 from the end of the reinforcing bars 10, but can be inserted directly from the side of the reinforcing bars 10 into the required location. It is possible.

Next, as shown in FIG. 3, which shows a cross section of the working state of this embodiment, the upper die 2 is lowered at once toward the reinforcing bars at a substantially right angle to the longitudinal direction of the reinforcing bars 10. As shown in FIG. As the upper mold 2 descends, the surface of the reinforcing bar joint material 14 and the deformed reinforcing bar 10 are moved toward the peripheral surfaces of the deep curved grooves 4 and 4' and toward the reinforcing bar joint end restraining portion 7 due to the frictional force and shear force between the surfaces of the reinforcing bar joint material 14 and deformed reinforcing bars 10. Pressed. However, the reinforcing bar joint material 14 is prevented from escaping by the circumferential surfaces of the deep curved grooves 4 and 4' and the reinforcing bar joint end restraint part 7, so the reinforcing bar joint material 14 bites into the edges and ribs of the reinforcing bars 10, and the two reinforcing bars 10 are prevented from escaping. To provide a reinforcing bar joint in which reinforcing bars 10 are crimped and connected by a reinforcing bar joint connecting part 9a. At the same time, during this crimping process, the reinforcing bar joint is pressed by the shallow curved grooves 5, 5' and the deep curved grooves 4, 4', so the outer peripheral surface of the reinforcing bar joint is A clear border 15 corresponding to the number of deep curved grooves 4, 4' is formed in a direction crossing the longitudinal direction, in this embodiment, in a substantially perpendicular direction. In addition, because it is pressed by the side grooves, the reinforcing bar joint has clear ribs 16 in the longitudinal direction on the outer circumferential surface.

By increasing or decreasing the interval between the two reinforcing bars 10, that is, the width of the central groove 11, and selecting the length of the reinforcing bar joint material 14, the distance between the two reinforcing bars 10, that is, the distance between the reinforcing bar joint connecting portions 9a, can be varied. Deformed rebar is provided.

When the reinforcing bar joint is configured in this way, the crimp strength between the reinforcing bar 10 and the reinforcing bar joint becomes large, and the mechanical adhesion strength on the outer circumferential surface of the reinforcing bar 10, especially the strength that is no different from that of the deformed reinforcing bar, becomes a reinforcing bar for concrete construction, It can be used as reinforcing bars for truss.

Therefore, the manufacturing process does not require continuous operations such as swaging when using a non-sealed type, and can be obtained in one operation, and can be used as reinforcing bar joint materials not only for pipe materials and sleeve tubes, but also for plates with ends. It is also possible to use a shaped body, and it becomes possible to press and fix the reinforcing bar joint material to the outer periphery of the reinforcing bar, especially the deformed reinforcing bar, while providing the necessary strength. When using a plate-shaped body having ends, it becomes possible to directly insert the reinforcing bar joint material 13 into the equipment location of the reinforcing bar joint from the side of the reinforcing bar 10, and from the end of the reinforcing bar as in a reinforcing bar joint using a sleeve pipe. Since there is no need for fitting, the work is simplified and a large work area is not required.

If the distance between two parallel reinforcing bars 10 is wide,
As shown in FIG. 6, it can be used as a main beam material.

Furthermore, even if it is inconvenient to weld directly to the surface of the deformed reinforcing bar, the purpose can be achieved by welding to the reinforcing bar joint.

(Effects of the Invention) Therefore, the present invention provides a reinforcing bar joint that has excellent crimp strength to reinforcing bars, connects a plurality of reinforcing bars to each other in the width direction, and has excellent surface mechanical adhesion strength.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a mold used for manufacturing an embodiment of the present invention, Fig. 2 is a central sectional view of the same processing state, and Fig.
FIG. 4 is a cross-sectional view of the same embodiment in a processed state, and FIGS. 5 and 6 are perspective views of the embodiment of the present invention. 1...Reinforcement joint crimping device, 2...Upper die, 3...
Lower mold, 4, 4'... Deep curved groove, 5, 5'... Shallow curved groove, 6, 6'... Groove section, 7, 7'... Reinforcement joint end restraint part, 8... Side groove, 9a...Reinforcement joint connection part, 9b...Fixing part, 10...Reinforcement bar, 11...Central groove, 12...End part, 13...Curved surface, 14...
Reinforcement joint material, 15...Fushi, 16...Rib.

Claims (1)

[Scope of Claims] 1. The reinforcing bars arranged in parallel are connected via a flat plate-shaped reinforcing bar joint connection part, and the inner periphery of the reinforcing bar is tightly attached to the outer periphery of the reinforcing bar at the fixed part with the reinforcing bar continuous to the reinforcing bar joint connection part. , a reinforcing bar joint characterized in that a bar is formed in a direction intersecting the longitudinal direction of the reinforcing bar on the outer periphery. 2. The reinforcing bar joint according to claim 1, wherein a rib is formed in the longitudinal direction of the outer periphery of the connection portion with the reinforcing bar. 3 Claim 1 in which the reinforcing bars are deformed reinforcing bars
or the reinforcing bar joint described in paragraph 2.