JPS6111595Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention aims to improve the anti-corrosion layer of tubular bodies for laying on the seabed, such as submarine cables and submarine water pipes. Generally, tubular bodies such as submarine cables or submarine water pipes are coated with armored iron wire to strengthen their outer periphery and facilitate installation on the seabed. Since it corrodes easily, in order to prevent this corrosion, a corrosion-resistant layer with excellent flexibility is usually provided by wrapping juute impregnated with asphalt. However, since juute is made of natural fibers, it is susceptible to cellulose decomposition due to microbial deterioration, and if juute is left on the seabed as it is, it will become tattered and its lifespan will disappear in about six months. Therefore, as an improvement to this, JUUT is used to add preservatives such as pentachlorophenol and heavy oil, but even with this treatment, it remains in seawater for about 1 to 2 years. The deterioration progresses significantly and the lifespan is lost. Along with this, the anti-corrosion function of the armored iron wire was also significantly impaired. Since the above-mentioned preservatives cannot be used these days due to their toxicity, there has been a strong demand for a new exterior packaging material to replace them. This invention was discovered as a result of intensive research in response to such requests. That is, the present invention provides an anti-corrosion layer made of palm fiber on the outside of the armored iron wire in the exterior portion of a tubular body for submarine laying, such as a submarine cable or submarine water pipe, which is coated with armored iron wire. The present invention uses palm fiber as an anti-corrosion material to form an anti-corrosion layer. Palm fiber is made by taking fibers from coconuts and processing them into a string-like body. It has extremely excellent hardness, abrasion resistance, and salt water resistance. In this way, palm fiber has excellent abrasion resistance, so for example, when manufacturing submarine cables or laying it on the seabed, there is very little damage to the cable even if it is caused by external trauma.Furthermore, because it is highly elastic, it is used for submarine cables and submarine transmission. A dense anti-corrosion layer is formed as the exterior of the water pipe, and it can sufficiently protect against bends in submarine cables and water pipes, so no excessive force is applied to the anti-corrosion layer. Furthermore, it has various properties such as excellent salt water resistance and very little deterioration over time in seawater. Therefore, palm fiber alone can provide sufficient results as an anticorrosion layer for tubular bodies for laying on the seabed, but there is no problem in impregnating palm fiber with asphalt compound, and in this case, the cohesive strength of palm fiber can be improved. It can be improved slightly. As anti-corrosion layers for tubular bodies for submarine installation, palm fibers according to the present invention and palm fibers impregnated with an asphalt compound (Comparative Example (1)) and jute impregnated with an asphalt compound were used as anti-corrosion layers on the outside of the iron wire sheathing. things (conventional example 1), glass cloth, glass mat (conventional example 2)
The performance of glass cloth and glass mat embedded in asphalt compound (Conventional Example 3) was measured. The results are shown in Table 1.

[Table] As is clear from the table above, when the palm fiber of the present invention is used as an exterior material, it has superior abrasion resistance compared to conventional glass cloth and glass mat, and has better corrosion resistance and abrasion resistance than jute. It is excellent. An example of the present invention will be explained in detail based on the drawings. As shown in Fig. 1, the armored cable of the present invention is made by wrapping a #14 palm fiber to a thickness of 5 mm on the outside of a submarine cable 1 covered with an armored iron wire 2 such as a 6 mm diameter galvanized iron wire to provide an anti-corrosion layer 3. Obtained. In the drawing, the outside of the anticorrosive layer 3 is impregnated with an antiseptic paint 4 of Fussphalt compound and then bound. In addition, for comparison with the present invention, only the anti-corrosion layer was used as #14.
A submarine cable was constructed using a Jute of 300 mm, and all other features were the same as above to obtain a submarine cable with a comparative exception. The product of the present invention and the comparative example were each immersed in seawater, taken out every 1, 2, and 5 years, and subjected to tensile tests on palm fiber and jute. A comparative test was conducted.
The results are shown in Table 2.

[Table] However, the tensile strength is the rate of decrease relative to the tensile strength before immersion. As detailed above, the present invention exhibits very little deterioration over time in seawater and has excellent resistance to external damage and abrasion, making it extremely useful as an exterior part for submarine cables and submarine water pipes.

[Brief explanation of the drawing]

The drawing is a sectional view of the exterior of a submarine cable that is an example of the present invention. 1... Cable, 2... Armored iron wire, 3... Anti-corrosion layer, 4... Preservative paint.

Claims (1)

[Scope of utility model registration request] An armored iron wire characterized in that an anticorrosion layer made of palm fiber is provided on the outside of the armored iron wire in the exterior part of a tubular body for submarine installation such as a submarine cable or a submarine water pipe. Exterior part of a tubular body for submarine installation.