JPS60254516A - Tensile stress sheath for cable and submarine cable with same sheath - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to armor for protecting the cable from tensile stresses and submarine cables equipped with this kind of armor, especially so-called urnbilical cables for use on the seabed.
cable).

Cables which are subjected to large tensile stresses are usually provided with a metallic tensile stress armor.

In the case of special cables, such as undersea cord cables, sheaths made of aramide fibers are used because the weight of these metal sheaths is too much to withstand a given tensile stress.

These fibers are wound single or double, with or without edge to edge, around the activated stone circumference of the cable and then covered with a reinforcing sheath.

However, these fibers tend to move and bunch up when the first tensile stress is applied (Lj), so that the cable becomes wavy and quickly becomes unusable.

French Patent Publication PR-A No. 2,402,283 discloses an example of a hemlock cable with a tensile stress armor. In this cable, the fiber is held in a plurality of rectangular cross-section members, which are connected to each other via insets that engage grooves in adjacent members, resulting in one continuous sheath around the entire circumference of the cable. It is formed.

Since said member has a rectangular cross section, it has various problems.

This is because sheathing formed using such elements does not constitute a self-locking system and does not form a vault structure unless the cable is subjected to maximum tensile stress.

Also, although thread cables are subject to not only pure tensile stress but also thread stress, the prior art cables mentioned above have low resistance to lateral stresses due to thread stress.

The present invention aims at overcoming these drawbacks and therefore provides a tensile stress armor comprising a plurality of self-locking members that form a vault structure even under small tensile stresses. Any type of cable provided with the armor of the present invention exhibits sufficient resistance to lateral stresses caused by thread stress.

□The tensile stress sheath for cables of the present invention consists of a plurality of long members having the same shape, and these members are fitted and connected with their ends abutting each other so as to extend over the entire periphery of the cable. , each comprising in its central part at least one fiber, in particular a metal or aramid fiber, and a generally circular rim on the can rim of each of these members, leaving a recess defining a free space for receiving the rim of the adjacent member. Special feature is that it is connected to the central part! shall be.

Preferably each member has in its central part two tips 15 which substantially close off the two free spaces defined by said recesses. Each free space has an identical but opposite shape to the rim of an adjacent member so as to engage the rim of an adjacent member.

Advantageously, each rim is reinforced with metal or aramid fibers and each member is provided with a longitudinal groove.

In a first embodiment of the invention, one rim of the members is placed inside the armor and the other rim is placed outside so that each member faces in the same direction.

A second embodiment has two limbs of the member on the same side so that every other limb faces in opposite directions.

The invention also relates to a submarine cable using two armors as described above.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The tensile stress armor and cable for use on the seabed of the present invention will be described below by way of non-limiting specific examples based on the accompanying drawings.

In FIG. 1, only a portion of the armor device O is shown in cross section. In this figure, several members 11 are interconnected. In order to simplify the drawing, only one of these members 11 is shown in cross-section. Each member 11 has a central portion 12 and two portions on both sides thereof.
It is composed of two rims, an inner rim 13 and an outer rim 14.

The central part 12 has two fibers 16 and two tips 15, for example of KEVLAR type metal or aramid.

Each rim 13.14 is generally circular, and a recess 19 is formed between the tip 15 and each rim 13.14, defining a free space for the insertion of the rim of the adjacent member. In fact, the material of each member (such as polypropylene or nylon) is sufficiently flexible to make a mating connection.

The rims 13,14 have in the center a fiber 17, for example of metal or aramid, each member also having six grooves 18, four of which are arranged two on each side of the central part and two on each rim. Each is provided separately. These grooves 18 are for better contact of the armor with a plurality of adjacent sheaths.

All said members are of the same shape and are arranged in the same direction, and the fibers in the same layer are arranged at a distance from the center of the cable with this type of armor.

FIG. 2 shows an armor 2 consisting of several members 21 connected to each other.
0 is shown in cross-section. To simplify the drawing, only one of these members is shown in cross-section. Each member 21
It consists of a central portion 22 and two rims 23 on either side thereof, both of which are provided on the same side.

The central part has two fibers 2, such as metal or ground wires.
6 and two protrusions 25.

The rim 23 is substantially circular, and a recess 29 is formed between the tip 25 and the rim 23 to define a free space into which the rim of an adjacent member is fitted. In fact, the material of each member (eg, polypropylene or nylon) is sufficiently flexible to make a mating connection.

Each rim 23 has a fiber 2 in the center, such as metal or aramid.
It has 7.

Said members are all of the same shape sb and are arranged in opposite directions, ie staggered.

In this example, the member is not provided with a groove, but this is not a problem.

Of course, it is possible to arbitrarily combine the two specific examples described above; for example, the grooves in the members in the same direction in FIG. may be provided.

Although a gap is shown between the fittingly connected members 11 and 21 in FIGS. 1 and 2 for clarity of the drawings, this gap can of course be omitted.

FIG. 3 shows a sheath 40 and two tensile stress sheaths 41.4.
2 and a reinforced exterior 4.
Henno cord cable 30 having an active center surrounded by 3 and
showed that.

The active core of this couple includes a central wire member 31, six coaxial cables 32, a zontic sheath 33 around it, and a plurality of flexible tubes 34 for flowing fluids such as oxygen, helium, and water. It is composed of a filler 35 for ensuring the cylindrical outer shape of the active core.

Of course, this active core may be constructed in any desired manner and components different from those described above may also be used. If the active core has a sufficiently cylindrical shape, the sheath 40 can be omitted, in which case the vort structure is in direct contact with the active stone. This tensile stress vault structure is made by winding two sheaths spirally in opposite directions at long pitches, and therefore does not rotate.

Each armor may of course be the armor shown in FIGS. 1 and 2, or may be modified by providing or omitting grooves.

The vault structure is covered with a reinforcing sheath 43 to hold the parts together. - The tensile stress armoring described above can of course be applied to all types of cables, such as electrical cables, fiber optic cables, fluid transport cables or composites combining all or part of these properties.

[Brief explanation of the drawing]

Figure #c1 is an explanatory diagram of the first specific example of the armor of the present invention, Figure 2 is an explanatory diagram of the second specific example of the armor of the present invention, and Figure 3 is an explanatory diagram of the second specific example of the armor of the present invention. It is an explanatory view of a cable. 10, 20.41.42... Armor, 11.21... Armor component, 12.22... Central part, 16, 17.26.27... Fine 18...
Longitudinal groove, ゛30...hen's cord cable. , FIG, I FIG, 2 FIG, 3

Claims (7)

[Claims] (1) A tensile stress armor for cables consisting of a plurality of long members of the same shape, which are fitted together with their edges abutting each other over the entire periphery of the cable. The members have at least one fiber, in particular of metal or aramid, in the central i, each of said members having approximately circular rims, one for each line, which rims define a free space for receiving the rims of adjacent members. 2. A tensile stress armor sheath, characterized in that: a groove is connected to the central portion leaving a recessed portion. (2) The central portion of each member has two prongs that substantially close the two free spaces defined by the recess, and each free space has the same shape as the rim and the opposite direction. A tensile stress armor according to claim 1. (3) Tensile stress armor according to claim 1 or 2, characterized in that each limb is reinforced with fibres, in particular of metal or aramid. (4) The tensile stress armor sheath according to any one of claims 1 to 3, wherein each of the members has a longitudinal groove. (5) one rim of the member is located inside the armor;
Tensile stress armor according to any one of claims 1 to 4, characterized in that the other rim is arranged on the outside so that each member faces in the same direction. (6) According to any of claims 1 to 4, characterized in that the rims of the elements are arranged on both sides, so that every other element is arranged in opposite directions. The tensile strength armor described. (7) A submarine cable composed of activated stone made up of a plurality of subassemblies, a sheath surrounding the activated stone, a tensile stress-resistant vault structure, and a reinforced sheath, wherein the vault structure is claimed as a patent. A cable comprising two tensile stress armors according to any one of items 1 to 5, which are wound spirally in opposite directions.