JP2021050519A - Coupling tool and manufacturing method of the same - Google Patents

Abstract

To provide a coupling tool of molds which hardly forms a gap between the molds even after repeated recycling and which can prevent liquid leakage.SOLUTION: There is provided a coupling tool 1 for coupling molds 11, 11 which have a coupling flange 13 formed with an insertion hole 14, the coupling tool comprising a U-shaped part 2, an L-shaped part 3 continuously arranged at one end of the U-shaped part 2, and a shaft part 4 formed at a distal end of the L-shaped part 3, and the shaft part 4 is formed with a male screw part 5. It is preferable that the coupling tool 1 is configured from fiber reinforced plastic which includes reinforced fiber and synthetic resin.SELECTED DRAWING: Figure 1

Description

The present invention relates to a connecting tool for connecting molding forms formed by pouring a hydraulic composition such as concrete, cement, and mortar.

Conventionally, when constructing a foundation structure such as a concrete wall, a plurality of steel formwork is connected around a reinforcing bar to form a formwork structure, and concrete or the like is formed in a space surrounded by the formwork structure. A method of placing a water-hard composition and removing the mold after the water-hard composition is cured is often used.

In order to connect the formwork to the formwork, as disclosed in Patent Document 1, the connecting flanges of the adjacent formwork are brought into contact with each other, and an insertion hole (clip hole) formed in the connecting flange is formed. In the superposed state, the shaft portion (fitting portion) of the connector, which is a so-called U-clip, is inserted into the insertion hole.

In that state, the U-clip is rotated in one direction around the shaft portion, and both connecting flanges are sandwiched between the U-shaped portions to connect the formwork. By rotating the U-clip in the direction opposite to one direction, the U-clip is disengaged from the connecting flange and the connecting flange is released from the connection.

Jitsukaisho 60-141343

By the way, although the steel formwork can be reused, the cured product of the hydraulic composition adheres to the formwork, and the formwork is twisted or distorted after repeated use. In this state, if the molds are connected to each other with a U-clip, there is a problem that a gap is generated between the molds and liquid leaks. In particular, since it is lightweight and has high strength, it is conceivable to use an FRP formwork, but such an FRP formwork is easily scratched on the surface, and the surface unevenness becomes larger as it is repeatedly reused. , The formwork was twisted and distorted, and the possibility of liquid leakage was high.

Therefore, an object of the present invention is to provide a formwork connector capable of suppressing the occurrence of liquid leakage because a gap between the formwork is unlikely to occur even after repeated reuse.

In order to achieve the above object, the connecting tool as one aspect of the present invention is a connecting tool for connecting formwork having a connecting flange having an insertion hole, and has a U-shaped portion and the U-shaped portion. An L-shaped portion that is continuously provided on one end side of the shaft portion and a shaft portion that is bent on the tip end side of the L-shaped portion are provided, and a male screw portion is formed on the shaft portion.

The U-shaped portion and the L-shaped portion may be made of a fiber reinforced plastic containing a reinforcing fiber and a synthetic resin. Further, the reinforcing fiber may be a short fiber.

A method for manufacturing a connecting tool for connecting molds having a connecting flange, which is a U-shaped portion, an L-shaped portion connected to one end side of the U-shaped portion, and a tip side of the L-shaped portion. In the connecting tool provided with the formed shaft portion, the U-shaped portion and the L-shaped portion are integrally formed by injection molding a resin composition in which short fibers are mixed as reinforcing fibers with synthetic resin. May be good.

According to the above aspect, in the connector of the present invention, a male screw portion is formed on the shaft portion, and a female screw member is screwed into the shaft portion and tightened while the U-shaped portion sandwiches the communication flange. There is no gap between the frames, and it is possible to maintain watertightness.

Top view showing the connector of this embodiment Schematic perspective view showing the usage state of the connector of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing a connector of the present embodiment. FIG. 2 is a schematic perspective view showing a usage state of the connector of FIG.

As shown in FIG. 1, the connector 1 includes a U-shaped portion 2, an L-shaped portion 3 connected to one end side of the U-shaped portion 2, and a shaft portion 4 formed on the tip end side of the L-shaped portion 3. A male screw portion 5 is formed on the shaft portion 4. More specifically, the L-shaped portion 3 has a shape in which the tip end side is bent toward the other end side of the U-shaped portion 2, and the bent tip end side portion is the shaft portion 4. The shaft portion 4 is formed so that its central axis C is parallel to the U-shaped forming surface of the U-shaped portion 2.

As shown in FIG. 2, in the formwork 11, a connecting flange 13 is integrally formed on the peripheral edge of the weir plate 12, and a plurality of insertion holes 14 are provided at intervals in the connecting flange 13. When connecting the formwork 11 and 11, the insertion holes 14 and 14 of the connecting flange 13 are overlapped, and the shaft portion 4 is inserted through both the insertion holes 14 and 14. Then, in that state, the connecting tool 1 is rotated around the shaft portion 4 in the right direction R (one direction) when viewed from the tip of the shaft portion 4, so that the U-shaped portion 2 becomes both connecting flanges 13 and 13. Take a connected posture to hold.

When the connecting tool 1 is rotated in the opposite left direction L from the connecting posture, the U-shaped portion 2 takes a releasing posture in which the connecting flange 13 is disengaged. In this way, the connecting tool 1 can be selectively switched between the connecting posture and the disengaging posture by rotating the connecting tool 1 around the shaft portion 4.

The female screw member 6 is screwed into the male screw portion 5 in a state where the connector 1 is in the connecting posture. In the present embodiment, a seated nut is used as the female screw member 6, but the present invention is not limited to this, and an ordinary nut or the like may be used. By tightening the female screw member 6 to the shaft portion 4, the connecting flanges 13 and 13 can be held in close contact with each other without any gaps.

As for the direction of the screw engraved on the male screw portion 5, when the connecting posture is taken by rotating the connecting tool 1 in one direction when viewed from the tip of the shaft portion 4, the male screw portion 5 is used as the central axis C. It is preferable to turn away in one direction when viewed from the axial direction of. In the present embodiment, since the connecting tool 1 is rotated in the right direction R to take a connecting posture, the direction of the screw of the male screw portion 5 is preferably right-handed. As a result, the direction R for tightening the female screw member 6 and the rotation direction R for taking the connecting posture coincide with each other, so that it is not necessary to provide a detent for the connecting tool 1 when tightening the female screw member 6.

The material of the connector 1 may be made of steel as in the conventional U-clip, but it is preferably made of fiber-reinforced plastic containing reinforcing fibers and synthetic resin. As a result, it is lightweight, has no risk of rusting, and can be used for a long period of time.

Further, in the case of the fiber-reinforced plastic connector 1, short fibers are used as reinforcing fibers, and the U-shaped portion 2 and the L-shaped portion 3 are integrally molded by injection molding a resin composition containing a synthetic resin and short fibers. can do. This eliminates the need for cutting to form the male threaded portion 5 from the steel rod-like body and bending to form the U-shaped portion 2 and the L-shaped portion 3 as in the steel connector. Therefore, according to the above manufacturing method, the production efficiency of the connecting tool can be improved.

As the synthetic resin constituting the fiber reinforced plastic, a thermosetting resin and a thermoplastic resin can be used. Examples of the thermosetting resin include unsaturated polyester resin, vinyl ester resin, epoxy resin, phenol resin, diallyl phthalate resin, and polyurethane resin. Examples of the thermoplastic resin include polypropylene resin, polyethylene resin, polyamide resin, polycarbonate resin, polybutylene terephthalate resin and the like. Engineering plastics such as polyphenylene sulfide, polyarylate, polysulfone, and polyetheretherketone can also be used.

As the reinforcing fiber, glass fiber, synthetic resin fiber, or carbon fiber can be used. Further, by using short fibers as reinforcing fibers and using injection molding of the connector, the male screw portion 5 having sufficient accuracy and sufficient strength is integrally molded together with the U-shaped portion 2 and the L-shaped portion 3. Is possible.

The reinforcing fibers used for injection molding may be short fibers having an average fiber length (number average fiber length) of 0.2 mm to 10.0 mm, preferably 0.5 mm to 5.0 mm. It is more preferably 0 to 3.0 mm. Within the above range, the main body member 7 can be efficiently and accurately molded by injection molding. In particular, as described above, the male threaded portion 5 can be accurately molded while maintaining the required strength. The number average fiber length of the short fibers can be measured by a known method. For example, the number average fiber length can be calculated from an image observed under a microscope using an image analyzer.

The compounding ratio of the synthetic resin: reinforcing fiber in the resin composition used for injection molding is preferably in the range of 85: 15 to 55:45 (mass ratio). As a result, it is possible to obtain the main body member 7 having excellent strength while maintaining good moldability. In the present embodiment, as the resin composition for injection molding, a resin composition containing 70% by mass of 6-nylon resin and 30% by mass of short fibers (number average fiber length 2.0 mm) made of glass fibers is used. ..

Although the embodiments of the present invention have been described above, the scope of the present invention is not limited to this, and various modifications can be made without departing from the spirit of the invention. Specifically, in the present embodiment, the case where a fiber-reinforced plastic material is used as the connecting tool has been described, but the present invention is not limited to this, and for example, a plastic material that does not contain reinforcing fibers can be used. In particular, plastics called engineering plastics or super engineering plastics can be preferably used.

The constituent elements disclosed in the present embodiment and the above-described modifications can be combined with each other, and by combining them, new technical features can be formed.

1 Connector 2 U-shaped part 3 L-shaped part 4 Shaft part 5 Male threaded part 6 Female threaded member 11 Formwork 12 Weir plate 13 Connecting flange 14 Insertion hole

Claims (4)

A connecting tool for connecting formwork having a connecting flange having an insertion hole formed therein, the U-shaped portion, an L-shaped portion connected to one end side of the U-shaped portion, and the L-shaped portion. A connector having a shaft portion formed on the tip side and having a male screw portion formed on the shaft portion. The connector according to claim 1, wherein the U-shaped portion and the L-shaped portion are made of a fiber-reinforced plastic containing a reinforcing fiber and a synthetic resin. The connector according to claim 2, wherein the reinforcing fiber is a short fiber. A method for manufacturing a connecting tool for connecting molds having a connecting flange, the connecting tool includes a U-shaped portion, an L-shaped portion connected to one end side of the U-shaped portion, and the L-shaped portion. A connecting tool having a shaft portion formed on the tip end side of the portion and integrally forming the U-shaped portion and the L-shaped portion by injection molding a resin composition in which short fibers are mixed as reinforcing fibers with synthetic resin. Manufacturing method.

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