JPH0849356A - Sleeve joint plug - Google Patents

Abstract

PURPOSE:To make it possible to increase a fixing power with a joint without lowering its sealing capacity by adopting a hard plastic outer layer which constitutes a mounting part and a soft plastic-made inner layer which constitutes a reinforcement holding part. CONSTITUTION:A male-female fit type mounting mechanism 5, such as a threaded type, a saw tooth engagement type or a band-fit type, which is installed to a mounting part 1 of a sleeve joint plug, is fitted in a fit-mounting mechanism installed to an opening end of a joint sleeve so that the plus may be fixed with the joint. As for this plus, an outer layer which constitutes the mounting part 1 is made of a hard plastic material and a light plastic elastomer material. The internal surface of the mounting part 1 is integrally formed with an inner layer which constitutes a reinforcement holding part 2 which is united with the mounting part by one piece molding where the inner layer is made of soft plastic and soft elastomer while a plurality of ring-shaped fin projections 4 are installed to the inner wall surface of a reinforcement insertion hole 3 of the reinforcement holding part 2. This construction makes it possible to secure a sealing capacity by increasing the flexible properties of the reinforcement holding part 2 and increase a joint-to-joint fixing power by increasing the the stiffness of the mounting part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sleeve joint plug. The plug is used for the purpose of fixing the rebar inserted in the sleeve joint to the joint and sealing the gap between the opening of the joint and the rebar.

[0002]

BACKGROUND OF THE INVENTION A sleeve joint, which is an elongated hollow cylindrical body, is a reinforcing bar joint which is a butt joint of a pair of reinforcing bars by inserting reinforcing bars into the reinforcing bars by inserting the reinforcing bars through openings at both ends of the cylindrical joints. Is.

Conventionally, a plug made of an elastic material shown in FIG. 3 has been used for the purpose of fixing the reinforcing bar inserted in the sleeve joint to the joint and sealing the gap between the joint opening and the reinforcing bar. See Japanese Utility Model Laid-Open No. 4-114909). In the figure, 7 is a mounting portion and 8 is a reinforcing bar holding portion.
The mounting portion 7 is fitted into the outer wall of the opening end of the sleeve joint and mounted. The reinforcing bar holding portion 8 is provided with a reinforcing bar insertion hole 9 which is a through hole into which the reinforcing bar can be loosely inserted, and a plurality of annular fins 10 are provided on the inner wall surface thereof. Since the opening diameter D of the annular fin 10 is smaller than the outer diameter of the reinforcing bar, the annular fin bends as the reinforcing bar is inserted and adheres to the outer surface of the reinforcing bar, and holds the reinforcing bar in the reinforcing bar holding portion. A side hole 11 is provided on the side wall of the reinforcing bar holding portion so that the discharge port provided at the end portion of the sleeve joint makes a face.

Deformed reinforcing bars are generally used as reinforcing bars. However, since the reinforcing bars have engraved intricate patterns on the surface and the patterns differ depending on the brand of reinforcing bar, the reinforcing bar insertion hole and the reinforcing bar are sealed. Although difficult, even if the outer shape of the deformed reinforcing bar changes due to the presence of the annular fin, it closely follows the outer shape of the inserted deformed reinforcing bar and adheres to it to complete the seal.

For the purpose of the above seal, the material of the plug must be flexible. On the other hand, it is desired that the mounting portion be made of a material having a high rigidity because a large fixing force between the plug and the joint is required. The conventional plug is made of a flexible material in order to prioritize the purpose of the above-mentioned sealing. In order to fit the mounting part to the outer wall of the joint opening end, the flexibility of the material is required because the mounting part with an inner diameter smaller than the outer diameter of the joint opening end is manually stretched and expanded and then fitted by contracting force. However, since the material of the mounting portion is highly flexible, in other words, has low rigidity, there is a problem that the fixing force between the plug and the joint is insufficient in the conventional plug. there were.

[0006]

DISCLOSURE OF THE INVENTION The present invention is provided to solve the above-mentioned problems in conventional plugs, in which the mounting portion is made of hard plastic (including hard elastomer) having high rigidity, and the reinforcing bar holding portion is used. This is solved by constructing a soft plastic having a high flexibility (including a soft elastomer).

According to the present invention, there is provided a fitting mechanism provided at the opening end of the sleeve joint and a fitting mechanism capable of fitting in a male-female fitting type, and the outer layer portion made of hard plastic and hard elastomer ( A mounting part made of hard plastic (hereinafter generically referred to as ") and a reinforcing bar made of soft plastic and soft elastomer (hereinafter collectively referred to as soft plastic), which is an inner layer portion integrally connected to the mounting part. And a plurality of annular fins are provided on the inner wall surface of the reinforcing bar insertion hole of the reinforcing bar holding section.

As the hard plastic in the present invention, hard polyethylene, polypropylene, polycarbonate, polyamide, other hard plastics and hard plastics containing fillers, hard rubbers and the like, which are slightly flexible, are preferable. As the soft plastic, vinyl-based plastics such as vinyl chloride and vinyl acetate, olefin-based, styrene-based, vinyl chloride-based, polyester-based, polyamide-based, urethane-based, other elastomers, and flexible rubber such as soft rubber are preferable.

As the male and female fitting type fitting mechanism, there are a screw fitting type which is a combination of a male screw and a female screw, or a combination of a spiral protrusion and a spiral groove, a saw tooth meshing type, a headband fitting type, and other known fitting mechanisms are used. it can.

The mounting portion may be mounted on the opening end of the sleeve joint by either an external mounting method in which it is fitted to the outer wall of the joint or an internal mounting method in which it is fitted to the inner wall of the joint. The outer layer portion and the inner layer portion may be bonded to each other by adhesion or fitting, but it is preferable that they are integrally molded by injection molding.

An example of one embodiment of the plug of the present invention is shown in FIG. This is an internal plug, 1 is a mounting part made of hard polyethylene (hatched part),
The soft plastic 2 is, for example, a styrene-based elastomer manufactured by Mitsubishi Petrochemical Co., Ltd., and a rebar holding part made of Lavalon (hereinafter referred to as Lavalon). The fitting mechanism 5 engraved on the outer wall of the mounting portion 1 of the plug in the figure (a) is of a sawtooth meshing type. That is, one or a plurality of one-step saw teeth formed by a back portion inclined to the major axis of the plug and an abdominal portion perpendicular to the major axis are provided. The reinforcing bar holding portion 2 is provided with a reinforcing bar insertion hole 3 which is a through hole along which its longitudinal axis can be loosely inserted, and is provided on the inner wall surface of the insertion hole so as to project in the direction perpendicular to the longitudinal axis of the insertion hole. A plurality of thin annular fins 4 are provided. The annular fins 4 preferably start at the inlet of the reinforcing bar insertion hole 3 and end at the outlet thereof and are provided at substantially equal intervals, and their opening diameters D are smaller than the outer diameter of the reinforcing bar to be inserted. The plug is fitted into a male-female saw tooth meshing type fitting mechanism provided on the inner wall surface of the opening end of the sleeve joint by pushing the plug through the opening. The fitting mechanism engraved on the outer wall of the mounting portion 1 (the hatched portion) of the plug in FIG.
The material of the plug and the structure of the reinforcing bar holding portion are the same as those of the plug shown in FIG. In addition, in FIG.
The base 12 of is shaped like a flange.
When this plug is screwed into the sleeve joint or detached after being screwed, if it is pinched and screwed or detached, there is an advantage that the work is easy because it is hard. This advantage is even greater if the flange-shaped base is notched around the periphery.

In order to manufacture the plug shown in FIG. 1, first, a mold for molding the reinforcing bar holding part is assembled and the reinforcing bar holding part is injection-molded with Lavalon. Then, remove the mold that is in contact with the outer wall of the reinforcing bar holding part and place the mold that should be in contact with the outer wall of the mounting part, and place the hard polyethylene in the gap created between this mold and the outer wall of the reinforcing bar holding part. To eject. As a result, a plug in which the reinforcing bar holding portion and the mounting portion are integrally coupled is manufactured by injection molding. After changing the above manufacturing order to first mold the mounting part, remove the mold that is in contact with the inner wall of the mounting part and arrange the mold that should be in contact with the inner wall of the reinforcing bar holding part, and place between this mold and the inner wall of the mounting part A method of injection molding in the gap generated in the above may be used.

Another embodiment of the plug of the present invention is shown in FIG. This is an external plug. Mounting part 1
The (shaded portion) has a shape in which a large-diameter cylinder and a small-diameter cylinder are integrated, and the large-diameter cylinder has a structure that can be fitted to the outer wall of the sleeve joint opening end. The reinforcing bar holder 2 is integrally connected and accommodated inside. The structure of the reinforcing bar holding portion is similar to that of the plug shown in FIG. The fitting mechanism provided on the inner wall of the large diameter cylinder of the mounting portion is a headband fitting type. That is, a projecting strip 6 is formed around the entrance edge of the large-diameter cylinder so as to surround it, and when this is pressed against the joint end so that the sleeve joint opening end is accommodated in the large-diameter cylinder, Since the opening diameter of the strip is smaller than the outer diameter of the joint, the large-diameter cylinder moves outward while opening slightly. The outer wall of the joint is engraved with a groove into which the ridge is to be fitted, and when the ridge advances to the position of this groove, the ridge of the groove is formed by the reaction force of the large diameter cylinder that was open. Fits snugly inside. At the time of this fitting, the bottom of the large-diameter cylinder comes into contact with the opening end of the joint. In order to increase the fitting force, it is preferable that the side surface of the large diameter cylinder is slightly curved outward. This plug is also injection molded from hard polyethylene and lavalon, similar to the plug of FIG.

The annular fin 4 and the ridge 6 may make one round without a break, or may have a break.

[0015]

The plug of the present invention has the same sealing ability as that of the conventional plug because the fitting parts and the reinforcing bar holding parts which are required to have different rigidity are made of materials which meet the respective requirements. It is possible to provide a plug having a large fixing force for the joint. Although the conventional plug is an external type, the internal type of the plug of the present invention has a fixing force for the joint larger than that of the external type because the reinforcing bar holding portion is housed in the joint end. Besides,
There is an advantage that there is no so-called cross-section defect because the non-contact part of the reinforcing steel with the concrete is removed outside the joint. Further, as shown in FIG. 1 (b), if the base of the mounting portion is formed in a flange shape, it is convenient for screwing and detaching the plug.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing one embodiment (internal mounting method) of a plug of the present invention.

FIG. 2 is a longitudinal sectional view showing another embodiment of the plug of the present invention (external mounting method).

FIG. 3 is a vertical sectional view showing a conventional plug.

[Explanation of symbols]

 1 Mounting Section 2 Reinforcing Bar Retaining Section 3 Reinforcing Bar Insertion Hole 4 Annular Fin 5 Saw-tooth Type Meshing Fitting Mechanism 6 Projection 7 Mounting Section 8 Reinforcing Bar Retaining Section 9 Reinforcing Bar Insertion Hole 10 Annular Fin 11 Side Hole 12 Base D Opening Diameter

Claims (1)

[Claims] 1. A hard plastic and a hard elastomer (hereinafter collectively referred to as a generic term) that is an outer layer portion that can be mounted on the end of the sleeve joint by using a fitting mechanism provided at the opening end of the sleeve joint and a fitting mechanism capable of fitting in a male and female fitting type. And a reinforcing bar holding part made of soft plastic and soft elastomer (hereinafter collectively referred to as soft plastic) which is an inner layer part integrally connected to the mounting part. And a plurality of annular fin projections are provided on the inner wall surface of the reinforcing bar insertion hole of the reinforcing bar holding portion.