JPS6125837B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a corrosion-resistant cable for mooring and a method for manufacturing the same.

Corrosion-resistant chains are usually used for mooring marine buoys, but chains suffer from problems such as fatigue, corrosion, and biofouling due to waves, and depending on the usage conditions, their lifespan is about 1 to 2 years. . Furthermore, a chain weighs about four times as much as a wire rope of the same strength, so it is necessary to increase the buoyancy of the buoy accordingly, making the buoy larger and increasing its cost. Therefore, it is preferable to use a wire rope instead of a chain, but when using a wire rope, the corrosion resistance of the terminal fitting attachment portion is a problem. As shown in Fig. 4, a conventional corrosion-resistant cable has a synthetic resin coating layer 2 on the outer peripheral surface of a wire rope 1.
1 is formed, the covering layer 21 is removed from the end portion, and the terminal fitting 4 is fixed by caulking. In this structure, the covering layer 21 is formed at the end of the caulked part.
Even if the wire rope 1 is crimped, it is not possible to ensure a perfect seal, so seawater infiltrates from this portion and enters between the strands of the wire rope 1, causing corrosion. Further, a structure as shown in FIG. 5 is also known. That is, the wire rope 1 is covered with a flexible tube 2 having an inner diameter larger than its outer diameter, and the anti-corrosive tube 3 is filled between them, and the wire rope 1 is separated into individual strands in the terminal fitting 11, and each strand is separated. The end of the wire 1a is connected to the spacer plate 12
are fixed by hetting process, respectively.
A resin 3a for fixing and fastening is injected into the terminal fitting 11 so that it is also filled between the strands 1a.
Further, the end of the terminal fitting 11 is closed by attaching a lid 14 through a gasket 13. This structure has the disadvantage that processing of the end portion is time-consuming, and in particular, the filling material must be injected twice into the end portion and the wire rope portion.

The present invention has been made to solve these conventional drawbacks, and provides a structure that is easy to work with and can reliably achieve corrosion resistance at the end portion, and a method for manufacturing the same.

A first aspect of the present invention is that a terminal fitting is fixed to the end of a wire rope made of a plurality of strands by caulking, a connecting pipe is attached so as to cover the caulked part of the terminal fitting, and the wire rope A flexible corrosion-resistant tube is connected to and covered over the entire length of the connecting pipe, and a watertight barrier is provided between the strands of the wire rope, between the wire rope and the flexible corrosion-resistant tube, and at the caulked portion of the terminal fitting. It is made by injecting ingredients. A second aspect of the present invention is that after a terminal fitting is fixed by caulking to the end of a wire rope covered with a flexible tube, a connecting pipe is inserted to close the gap between the tube and the terminal fitting. Attach and press-fit watertight corrosion-proofing material into the tube through this connecting tube so that it is filled between the wire rope and the tube, the caulked part of the terminal fitting covered by the connecting tube, and between the strands of the wire rope. This is how it was done.

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2, a wire rope 1 made of a plurality of strands 1a is covered with a flexible tube 2 having an inner diameter larger than its outer diameter.
A terminal fitting 4 is fixed to the end portion of the terminal member 4 by caulking. A connecting tube 5 is fitted onto the end of the flexible tube 2 and the terminal fitting 4, and the connecting tube 5 and the terminal fitting 4 are screwed together. They are connected by a heat-shrinkable tube 6. In addition, tube 2 is attached to wire rope 1.
A spacer 10 is wound around the spacer 10 so as to form a gap around the entire circumference, and the spacer 10 is filled with a filler 3 made of a liquid reaction-curable flexible polymer material. Moreover, the filler 3 is also filled in the gaps between the strands 1a of the wire rope 1 by being press-fitted. Furthermore, in the caulked part, as shown in FIG. 3, the mutual contact parts of the strands 1a are plastically deformed (plastic deformation part 8), but gaps are left between each strand 1a, and there are also gaps between the strands 1a. Filler material 3 is filled. In addition, the terminal fitting 4 has a small hole 7 that reaches the end surface of the wire rope 1.
This small hole 7 is filled with an appropriate sealing material to form a seal. Note that although only one end of the wire rope 1 is shown in the drawing, the other end also has a similar configuration. However, this small hole 7 is not always necessary.

Next, a method for manufacturing a cable having such a structure will be explained. First, the terminal 4 is fixed to one end of a wire rope made of a plurality of wires 1a by caulking. Terminal 4 is JIS, S15C to S35C
Alternatively, use structural carbon steel or alloy steel equivalent to these. A small hole 7 is formed in the terminal fitting 4 so that the end surface of the caulked portion of the wire rope 1 communicates with the atmosphere. After a spacer 10 is wound around the wire rope 1, a tube 2 is fitted onto the wire rope 1, and a terminal fitting 4 is similarly attached to the other end of the wire rope 1. The purpose of winding the spacer 10 is to form a predetermined amount of gap between the wire rope 1 and the tube 2, and the spacer 10 may be made of stranded wire, plastic-covered wire, rubber or plastic. You can use something like a round string. Further, as the tube 2, a rubber tube or a polyethylene tube having excellent pressure resistance and corrosion resistance against seawater is suitable.

Next, the connecting tube 5 is placed so as to cover the caulked part (the connecting tube 5 is fitted onto the outer tube 2 at an appropriate position in advance), one end of which is screwed onto the terminal fitting 4, and the other end is screwed onto the terminal fitting 4. A heat shrink tube 6 is attached to connect the tube 2 and the connecting pipe 5. Next, an injection device (not shown) is attached to the injection port 9 of the connecting pipe 5, and the reaction-curing polymeric material is filled therefrom. Note that an exhaust port is formed in the connecting pipe at the other end (not shown), and the filler 3 is injected from the exhaust port until it overflows, and even after the inside is filled with the filler 3, the injection is continued. Apply pressure. By this pressurization, the filler material 3 is filled in the gaps between the strands 1a of the wire rope 1 and also in the caulked portions and the gaps between the strands 1a. Further, during this filling, air is removed from the small holes 7, so that filling is performed more smoothly. After filling is completed and the filling material 3 is cured by reaction, the injection port 9 and the small hole 7 are opened.
Seal using an appropriate method. Note that the small holes do not necessarily have to be formed.

In the cable manufactured by the above method, the caulked portion is also completely isolated from the air, the terminal fitting 4 has excellent attachment strength, and good corrosion resistance is maintained for a long period of time. Further, there are advantages in that the attachment of the terminal device is easy and the filling material can be injected in one go.

As explained above, the present invention provides a corrosion-resistant cable in which a terminal fitting is attached to the end of a wire rope by caulking, and the corrosion resistance of that part is maintained well, and the cable is easy to manufacture. It has excellent corrosion resistance and is excellent as a mooring cable.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view showing an embodiment of the present invention, Fig. 2 is a cross-sectional view taken along the - line, Fig. 3 is a partially enlarged explanatory view of Fig. 2, and Figs. 4 and 5 are respectively conventional cables. FIG. DESCRIPTION OF SYMBOLS 1...Wire cable, 2...Outer pipe, 3...Filling material, 4...Terminal fitting, 1a...Element wire.

Claims (1)

[Scope of Claims] 1. A terminal fitting is fixed to the end of a wire rope made of a plurality of strands by caulking, a connecting pipe is attached so as to cover the caulked portion of the terminal fitting, and the entire length of the wire rope is fixed to the end of the wire rope. A flexible corrosion-resistant tube is connected to and covered with the connecting pipe, and a water-tight corrosion-resistant tube is provided between the strands of the wire rope, between the wire rope and the flexible corrosion-resistant tube, and at the caulked portion of the terminal fitting. Corrosion-resistant mooring cable made by injection. 2. After fixing the terminal fitting to the end of the wire rope covered with the flexible tube by caulking, attach a connecting pipe that closes the gap between the tube and the terminal fitting, and insert the watertight barrier through the connecting pipe. A corrosion-resistant cable for mooring, characterized in that the food material is press-fitted into the tube so that it is filled between the wire rope and the tube, the caulked part of the terminal fitting covered with the connecting pipe, and between the strands of the wire rope. manufacturing method.