JPH0219477Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a mold for a reinforcing bar joint crimping device for crimping reinforcing bar joints to reinforcing bars for use in concrete structures.

Conventionally, reinforcing bars were joined using reinforcing bar joints by inserting the reinforcing bars to be joined in a sleeve tube, and then swaging the reinforcing bars from above the sleeve tube in the longitudinal direction of the reinforcing bars using a die, etc., to crimp them together. . However, in such conventional examples, since it is a closed type, it is difficult to process it all at once, and the processing apparatus itself is large-scale, making it difficult to work quickly at the work site. Furthermore, in order to crimp with a sleeve tube, it is necessary to insert the sleeve tube into the end of the reinforcing bar, move the sleeve tube to the point where it needs to be secured, and then secure it, which complicates the work and requires a large space. However, it had the disadvantage that it was not suitable for work on construction sites.

Therefore, it may be possible to use a plate-shaped body as a reinforcing bar joint material and fix it to the reinforcing bars by crimping, but in the conventional crimping method, plate-shaped bodies such as iron plates have ends, so the ends are attached to the reinforcing steel by the rebound force after crimping. It was generally thought that reinforcing bar joints would not have sufficient strength because they were thought to peel off easily from the surface.
It was never attempted.

Therefore, in another conventional example, reinforcing bars to be joined are inserted into a sleeve pipe, and a tightening member such as a wedge 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 disadvantage of requiring a tightening member such as a wedge.

In addition, deformed rebars are often used as reinforcing bars in concrete structures these days, but deformed rebars originally have protrusions or serrations on their outer circumferential surfaces to increase the mechanical adhesion strength of the reinforcing steel surfaces. The reinforcing bars have many knots in the longitudinal and cross directions.

However, in the conventional example in which the outer periphery of the reinforcing bar joint lacks protrusions, when viewed from the entire reinforcing bar, there was a drawback that the surface of the reinforcing bar joint part lacked mechanical adhesion strength. In particular, in the crimp connection between reinforcing bar joints and reinforcing bars by swaging, it is possible to form ribs in the longitudinal direction on the outer periphery of the reinforcing bar joints, but it is difficult to form ribs in any direction other than the longitudinal direction on the outer periphery of the reinforcing bar joints. It had the following drawback. In addition, other conventional methods of crimping reinforcing bar joints to deformed reinforcing bars using collar crimping, and biting reinforcing bar joints into edges or ribs of deformed reinforcing bars by squeezing are based on the mechanical adhesion that the outer circumferential surface of deformed reinforcing bars has on the outer circumferential surface of reinforcing bar joints. It is not intended to provide strength equivalent to that of the rebar, and has the disadvantage that it is not possible to provide the same mechanical adhesion strength to the outer circumferential surface of the rebar as the surface of the deformed rebar.

Furthermore, in the conventional crimping using sleeve pipes disclosed in, for example, Japanese Patent Publication No. 52-34033 "Method of Connecting Deformed Reinforcement Bars" and Japanese Patent Publication No. 52-34034 "Method of Connecting Deformed Reinforcement Bars", crimping fittings are inserted from above the sleeve pipe. A groove is formed on the inner surface of the sleeve, and the regular fastener is passed through the inside of the die to press the sleeve onto the surface of the deformed reinforcing bar. However, even if there is a step on the inner surface of the clamping tool that has a radius of curvature smaller than the inner circumferential surface of the sleeve clamping part, it is only to make the mounting of the clamping tool more convenient, and it is only for the sake of convenience in the longitudinal direction of the sleeve. It does not have the effect of crimping the surface of deformed reinforcing bars. Therefore, the action and effect of the stepped portion is limited, and even if an attempt is made to crimp the sleeve with stronger pressure, its contribution to the crimp force in the longitudinal direction of the sleeve tube is limited. It had certain problems.

This idea is designed to provide a deep surface to the machining surface of the upper and lower dies, which are harder than the reinforcing bar joints that are fixed to the crimping ends of the crimping device for reinforcing bar joints, which performs close-separation action when crimping reinforcing bar joints to the reinforcing bars. A groove is formed by alternately drilling curved grooves and shallow curved grooves in the longitudinal direction, and both longitudinal ends of the groove in the upper mold and the lower mold are closed with a rising reinforcing bar joint restraint part. It is an object of the present invention to solve the above-mentioned problems by providing a mold for a reinforcing bar joint crimping device having characteristics.

The following is a first embodiment showing a perspective view of one embodiment of this invention.
Referring to FIG. 2, which shows a central cross-section of the processed state of this embodiment, reference numeral 1 denotes a reinforcing bar joint crimping device. Reference numeral 2 denotes an upper mold that is fixed to one of the crimping ends of the reinforcing bar joint crimping device 1, and 3 is a lower mold that is fixed to the other crimping end of the reinforcing bar joint crimping device 1, both of which have approximately the same machined surface. Since the reinforcing bar joint crimping device 1 has a hydraulic cylinder (not shown) above 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 the output is preferably 30 to 150 tons, preferably 50 to 100 tons. has an output.

4 and 4' are deep curved grooves drilled in the processing surfaces of the upper mold 2 and lower mold 3, 5 and 5' are shallow curved grooves bored in the processing surfaces of the upper mold 2 and lower mold 3,
Deep curved grooves 4, 4' and shallow curved grooves 5, 5' are alternately bored in the longitudinal direction of groove portions 6, 6' consisting of both.

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 in the groove parts 6, 6'. The number of shallow curved grooves may be 1, 2, 5, 8, etc., depending on the length of the grooves.

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, 4' and the shallow curved grooves 5, 5' are almost equal in this embodiment, but a and b may be a<b, but a=b or a>b. It is desirable that there be.

deep curved grooves 4, 4' and shallow curved grooves 5,
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.

The reinforcing bar joint 10 9 is a deformed reinforcing bar, and in the processing of this embodiment, two reinforcing bars are joined in the longitudinal direction.

Therefore, in the groove 6' of the lower die 3, a reinforcing bar joint material made of a sleeve tube or a steel plate having a U-shaped cross section with an upper end is placed, which is inserted into the deformed reinforcing bar 10.
The reinforcing bar joint material only needs to have an end in its cross-sectional shape, and may be V-shaped or the like, but it is desirable that the processed upper end faces slightly inward. The width between the ends is wider than the outer diameter of the deformed reinforcing bars 10, and in that case, it is not necessary to insert the reinforcing bar joint material into the deformed reinforcing bars 10 from the ends of the deformed reinforcing bars 10, but from the side of the deformed reinforcing bars 10 at the necessary points. It can be inserted directly into the

Next, as is clear from FIG. 3, which shows a cross section of the processed state of this embodiment, the upper mold 2 is lowered in the direction of the reinforcing bars at substantially right angles to the longitudinal direction of the deformed reinforcing bars 10. Upper mold 2
As the surface of the reinforcing bar joint material descends, the surface of the reinforcing bar joint material becomes
It is pressed toward the peripheral surfaces of the deep curved grooves 4 and 4' and toward the reinforcing bar joint end restraining portion 7. However, the escape of the reinforcing bar joint material is prevented by the peripheral surfaces of the deep curved grooves 4, 4' and the reinforcing bar joint end restraint part 7, so the reinforcing bar joint is
To provide a reinforcing bar joint in which two deformed reinforcing bars 10 are crimped together with a rib and a rib. At the same time, in this crimping process, the reinforcing bar joint 9 has shallow curved grooves 5, 5',
Since the reinforcing bar joint 9 is pressed by the deep curved grooves 4, 4', the outer circumferential surface of the reinforcing bar joint 9 has a clear edge corresponding to the number of the deep curved grooves 4, 4' in a direction approximately perpendicular to the longitudinal direction, as shown in FIG. Since the reinforcing bar joint 9 is formed and pressed by the side grooves, a reinforcing bar joint having clear ribs in the longitudinal direction of the outer circumferential surface of the reinforcing bar joint 9 can be easily and quickly provided.

FIG. 5 shows another example of this invention in which the groove portions 6, 6' are provided with two grooves parallel to each other in the longitudinal direction, and a central groove 11 is formed between the two grooves on the same plane as the side grooves 8. It is a perspective view of an embodiment, and in this embodiment, a sleeve tube in which two deformed reinforcing bars 10 are inserted in parallel into a groove 6' of a lower die 3, or a reinforcing bar made of a steel plate having a W-shaped cross section with an upper end. Place the joint material. The reinforcing bar joint material only needs to have an end in its cross-sectional shape, and it is desirable that the processed upper end faces slightly inward. The width between the ends is wider than the outer diameter of the deformed reinforcing bars 10, and in that case, fitting the reinforcing bar joint material into the deformed reinforcing bars 10 is as follows:
It is not necessary to do this from the end of the deformed reinforcing bar 10, but it can be inserted directly into the required position from the side of the deformed reinforcing bar 10. Next, as shown in FIGS. 6 and 7, which sequentially show cross sections in the processed state, the upper die 2 is lowered in the direction of the reinforcing bars at substantially right angles to the longitudinal direction of the deformed reinforcing bars 10. As the upper mold 2 descends, the surface of the reinforcing bar joint material is pressed toward the deep curved grooves 4, 4' circumferential surface and the reinforcing bar joint restraining portion 7 due to the frictional force and shear force between the reinforcing bar joint material and the surface of the deformed reinforcing bar. However, the relief of the reinforcing bar joint material is caused by the peripheral surfaces of the deep curved grooves 4, 4' and the reinforcing bar joint end restraint part 7.
In order to prevent this, the reinforcing bar joint material is made by inserting the edge of the deformed rebar 10, inserting the rib, and two parallel deformed rebars 1.
To provide a reinforcing bar joint 9 that is crimped to 0.

At the same time, during this crimping process, the reinforcing bar joint 9 is pressed by the shallow curved grooves 5, 5' and the deep curved grooves 4, 4', so that the outer peripheral surface of the reinforcing bar joint 9 is formed in the deep curved grooves 4, 4 in a direction substantially perpendicular to the longitudinal direction. A reinforcing bar joint 9 as shown in FIG. Provide simple and quick delivery.

By increasing or decreasing the distance between the two deformed reinforcing bars 10, that is, the width of the central groove 11, deformed reinforcing bars with various distances between the two deformed reinforcing bars 10 can be provided.

Therefore, in this invention, since a non-sealed type is used, not only pipe materials and sleeve materials, but also plate-shaped objects with ends can be crimped and fixed to the outer periphery of reinforcing bars, especially deformed reinforcing bars, after giving the necessary strength. becomes possible. Therefore, it becomes possible to directly fit the reinforcing bar joint material into the device part of the reinforcing bar joint from the side of the deformed reinforcing bar 10, and it is possible to avoid the inconvenience of fitting from the end of the reinforcing bar as in conventional reinforcing bar joints using sleeve material. . Therefore, the work is simplified and a large workshop is not required.

Furthermore, since the reinforcing bar joint 9 has such a configuration, the crimp strength between the deformed reinforcing bar 10 and the reinforcing bar joint 9 is high. The mechanical adhesion strength is the same as that of the surface of the deformed reinforcing bars 10, and it can be used for concrete construction reinforcing bars and truss reinforcing bars.

Furthermore, if the distance between two parallel deformed reinforcing bars is made wide, it becomes possible to use it as a column dyeing material as shown in FIG. 9.

Furthermore, even if it is inconvenient to weld the deformed reinforcing bars directly, the purpose can be achieved by welding them to the reinforcing bar joints.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an embodiment of this invention, Fig. 2 is a central sectional view of the processing state of the embodiment, Fig. 3 is a cross-sectional view of the same, and Fig. 4 is a deformed reinforcing bar joint produced by this embodiment. FIG. 5 is a perspective view of another embodiment of this invention, FIGS. 6 and 7 are cross-sectional views of another embodiment in a processed state, and FIGS. 8 and 9 are views of another embodiment of this invention. It is a perspective view of the resulting deformed reinforcing bar joint. 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, 9...Reinforced joint, 10
...Deformed reinforcing bar, 11...Central groove.

Claims (1)

[Scope of utility model registration request] In the upper and lower dies, which are harder than the reinforcing bar joints that are fixed to the crimping end of the reinforcing bar joint crimping device that performs close-separation action when crimping the reinforcing bar joints to the reinforcing bars,
Deep curved grooves and shallow curved grooves are alternately drilled in the machined surfaces of the upper and lower molds to form grooves in the longitudinal direction, and both longitudinal ends of the grooves of the upper and lower molds are formed in an upright shape. A type for a reinforcing bar joint crimping device characterized by closing at a reinforcing bar joint restraint part.