EP1113460A2 - Cable, especially submarine cable, and its manufacturing method - Google Patents

Abstract

The cable (10,11) has a core with several conductors surrounded by reinforcement (18,19) or reinforcement sections comprising reinforcement wires. Individual reinforcement wires in the reinforcement or in at least one reinforcement section are at least partly replaced by filling strands (31) of a more extensible or flexible material. Preferably, the filling strands have the same cross-section as the reinforcement wires. An Independent claim is included for a method for manufacturing the cable.

Description

The invention relates to a cable, in particular a submarine cable, According to the preamble of claim 1 and 2. Furthermore relates to the invention a method for producing a Cable, in particular a submarine cable, according to the preamble of Claim 9.

In addition to a predominantly metallic and / or Cable core having optical conductors via a cable core surrounding reinforcement from one or more reinforcement layers. The reinforcement takes mechanical stress on the Cable on. The reinforcement is particularly useful for submarine cables to the cable core with the conductors when laying, picking up, Landing, plowing or the like before the given to protect mechanical loads. With sea areas with rocky hatched seabed in the area of underwater mountains with steep slopes, even in shallower ones for fishing and waters used for anchoring on those intended for landings Routes, submarine cables are replaced by additional ones Reinforcement layers protected.

Especially with submarine cables on routes with different Water depths and / or changing formation of the seabed the reinforcement will be placed on the continuous cable length not exposed to the same stress everywhere. Since the Reinforcement structure with continuous submarine cables always dependent must be dimensioned from the greatest load, is the reinforcement on length sections with less Oversized load. This makes such a cable more expensive and above all, the cable has an unnecessarily large size Weight on.

It is already known to use cables, especially submarine cables, to adapt to different mechanical loads composite cable sections to form depending on the load have one or more reinforcement layers. To have to in addition the cable sections with different structure on their facing ends are connected together. The happens through additional connecting sleeves or splices differently constructed between the adjacent ends Cable sections. Especially the connection sleeves require a considerable additional effort.

Proceeding from this, the invention is based on the object To create cables, especially a submarine cable, over a structure that meets local requirements. Furthermore, the invention is based, a simple task Process for producing such a cable, in particular Submarine cable.

A cable for solving the above task has the features of claim 1. The fact that individual reinforcing wires preferably at least in some areas by filling strands same cross section from a less tensile and / or limp, in particular lighter material are replaced, a reinforcement can be created that corresponds to the given mechanical loads on the cable is matched. In particular can run sections in the longitudinal direction of the cable individual reinforcement wires through correspondingly long filler strands be replaced. The fill strands serve practically only as Gap fillers that ensure that the reinforcement all around remains closed by the filling strands adjoining Hold the reinforcement wires together in their intended position.

The fact that in the longitudinal direction of the cable, if necessary more or less large number of reinforcing wires Filling strands is replaced, the cable points along its length reinforcements of different strengths that meet requirements can be placed by where less loads on the reinforcements, a certain one Number of armouring wires in sections through the filler strands is replaced. The fill strands serve only to keep the reinforcement closed without any significant absorb external mechanical loads. The result possible formation of the fill strands from a less tensile and / or limp material, such as plastic, especially fiber-reinforced plastic, does that Cable lighter and cheaper.

The replacement of the reinforcing wires according to the invention as required filling strands can be used for all conceivable cable types and Constructions are used, and not just for submarine cables. The individual reinforcement wires and filler strands can be used the reinforcement straight in the longitudinal direction of the cable run, but also twisted and / or stranded.

Another cable to solve the problem mentioned above has the features of claim 2. So the cable is in the area of reinforcement from several, at least two, Reinforcement sections formed, but at least the Cable core is uninterrupted. The reinforcement of a reinforcement section has at least one end region a fill strand on a portion of a reinforcing wire in the relevant end region of the reinforcement section replaced. By replacing one or more reinforcement wires at least one reinforcement section in the end area filling strands reduce the mechanical, external resilience the relevant area of the cable to the end of the concerned Reinforcement section down. Preferably become the junction all reinforcement wires of a reinforcement layer of the reinforcement section replaced by fill strands. At the end such a reinforcement section then has at least one outer reinforcement layer only fill strands, which in particular due to their formation from a limp material do not tend to jump open and thereby connecting the mutually facing ends preferably different Lighten reinforcement sections.

The reinforcement sections expediently have different ones Reinforcements to adapt the cable to different external loads. This applies especially to submarine cables that for example in different water depths and / or at Different types of seabed (formation) be placed. In such a case, the reinforcement sections have usually a different number of Reinforcement layers. For example, one has less stressed area of the cable over a single reinforcement layer, while a more heavily loaded area two (or too still has several) reinforcement layers. In this case preferably the outer reinforcement layer of the plurality of reinforcement layers having reinforcement section towards the other Reinforcement section one in the longitudinal direction towards the end increasingly less number of reinforcing wires. The Replacement of these reinforcing wires with filler strands with preferably same cross section leads to the end of the concerned reinforcement section, the filling strands increase, and to the extent that at the end of the reinforcement section the outer reinforcement layer only fill strands having. Because the cross sections of the filling strands are preferred that remains the same as that of the reinforcing wires outer reinforcement layer closed, that is, the outer Dimensions of increasing gradually in the longitudinal direction Number of reinforcing sections having filling strands do not change compared to those reinforcement sections in which the outer reinforcement is wholly or only partially Has reinforcing wires.

It is also provided that the sections Reinforcement wires replacing fill strands in the course of each Cable, especially the uninterrupted cable core to connect the respective reinforcement wire. This will the reinforcing wire that is removed in certain areas from the serving as a filler in the longitudinal direction of the Cable continued, so extended. The connection of the respective reinforcing wire with the filler strand takes place in particular by means that the junction is not worth mentioning thicken. For example, there is a thin-walled tube preferably made of steel, aluminum or stainless steel. In the tube is inserted up to half its length End area of the reinforcement wire and the one to be connected to it Filling strand inserted and connected to the tube. This can be glued or squeezed together in certain areas of the tube happen. Alternatively, it is conceivable to face each other Ends of the reinforcement wire and filler to stick together. Such a connection point no thickening, so that a seamless transition from Reinforcement wire to the fill strand is given.

A method for solving the problem mentioned at the outset the measures of claim 9. In that the continuous Cable core is provided with a reinforcement that consists of different reinforcement sections is formed a reinforcement that meets the requirements is formed. Where the mechanical loads on the cable are lower, because, for example, a submarine cable in shallower water is placed and plowed in, an arming section with a smaller number of reinforcing wires can be used. In areas with higher loads, however, the reinforcement shows Reinforcement sections with a larger number of reinforcement wires on. It can be a cable, especially submarine cable, form, in some areas a differently resilient Has reinforcement. The reinforcement sections are for submarine cables expediently chosen and placed so that one reinforcement meets the given requirements, in particular the reinforcement for submarine cables the depth profile of the Cable route is adjusted.

By making sections of at least some reinforcement wires or whole reinforcement wires of at least one selected Reinforcement section to be replaced by filling strands and Filling strands with armoring wires from another armoring section or be connected to those reinforcing wires, whose sections are replaced and filled in by the filling strands If necessary, heavier and stiffer reinforcement wires can be used in any length and number by lighter and especially sagging filling strands to be replaced, wherein the fill strands the spaces of the replaced sections of the Take over the reinforcement wires in the relevant reinforcement layer and thereby the remaining armoring wires in the Hold the reinforcement layer together. The reinforcement wires with the Cored wires thus form an overall closed reinforcement layer, thereby shaping the cable thus produced remains unchanged. The replacement of individual armoring wires with Filling strands causes the cable to be its usual maintains round, cylindrical shape and the diameter does not change. The manufactured by the inventive method Accordingly, the cable has a continuous lengthwise direction Course with constant diameter without that is visible on the outer shape of the cable which places and in what number of reinforcement wires Fill strands have been replaced.

According to a preferred development of the method The reinforcement wires towards the end of the respective reinforcement section preferably an outer reinforcement layer in increasing Dimensions replaced by fill strands, so far that in the end of a reinforcement section at least the outer reinforcement layer only has filling strands, which may be the only one (Inner) reinforcement of the adjacent reinforcement section can overlap a short distance. The at the end of the concerned reinforcement section only in the outer Reinforcement layer ensure existing fill strands through their limp properties a cohesion of the external Reinforcement layer at the end of the reinforcement section, whereby the Do not open up the filling strands of the outer reinforcement layer.

Preferably, the ends of the filler strands are the outer Reinforcement layer by a bandage, for example wrapping from high tensile fibers, cords or the like in preferably the entire transition area between neighboring ones Reinforcement sections held together. This bandage or wrapping can form a continuous Transition at the subsequent end area of the neighboring one Reinforcement section with a smaller diameter as a result a missing reinforcement layer.

Fig. 1

einen Querschnitt durch eine Type eines Seekabels,

Fig. 2

einen Querschnitt durch eine andere Type eines Seekabels,

Fig. 3

eine Seitenansicht einer Verbindungsstelle zweier unterschiedlich aufgebauter Armierungsabschnitte eines Seekabels, und

Fig. 4

eine Verbindungsstelle eines Armierungsdrahts mit einem Füllstrang in einem Längsschnitt.

Preferred exemplary embodiments of the invention are explained in more detail below with reference to the drawing. In this show:

Fig. 1

a cross section through a type of submarine cable,

Fig. 2

a cross section through another type of submarine cable,

Fig. 3

a side view of a junction of two differently constructed armor sections of a submarine cable, and

Fig. 4

a connection point of a reinforcing wire with a filler strand in a longitudinal section.

The invention is explained by way of example using different Submarine cables. 1 shows a cross section a submarine cable 10 with a structure known per se. In the Fig. 2 is a cross section through a submarine cable 11 with a other structure shown basically known type.

The submarine cables 10 and 11 basically have one inside same structure. In this respect, 10 for both submarine cables and 11 use the same reference numerals. The same trained Cable core 12 of submarine cables 10 and 11 have a central, central cladding tube 13. In the cladding tube 13 are in the Embodiment shown several optical conductors, namely Optical waveguide 14, loose in a manner known per se arranged. The remaining cavity in the cladding tube 13 can may be filled in by a highly viscous, flowable Filling compound. The cladding tube 13 is surrounded by one Reinforcement layer 15 made of several identical reinforcement wires 16. The metallic reinforcement wires 16 are directly adjacent to one another arranged in the reinforcement layer 15 so that they result in a closed jacket around the cladding tube 13. Finally, the cable core 12 has an inner one Envelope 17 made of an insulating material, for example Plastic, such as especially polyethylene. The inner wrapping 17 electrically separates the cable core 12 from those around the cable core 12 arranged around parts of the submarine cables 10 and 11, and thus in the laid state from the sea-earth.

Each of the two submarine cables 10 and 11 is armored 18 and 19. These reinforcements 18 and 19 are for the submarine cables 10 and 11 formed differently. With submarine cable 10 Reinforcement 18 formed from two reinforcement layers 20 and 21. A inner reinforcement layer 20 surrounds the inner casing 17 of the Cable core 12. The outer reinforcement layer 21 surrounds the inner one Reinforcement layer 20. The outer reinforcement layer 21 is preferred surrounded by an outer envelope 22, which is made of plastic or a plastic-like material (for example Polypropylene yarn) is formed.

The submarine cable 11 differs from the submarine cable 10 in that that the reinforcement 19 has only a single reinforcement layer. This reinforcement layer corresponds to the inner reinforcement layer 20 of the submarine cable 10 and is therefore with the same reference number Mistake. The only reinforcement layer 20 of the submarine cable 11 is in turn surrounded by an outer casing 24 which is used for Protection of the submarine cable 11 is made of the same material as the outer envelope 22 is formed.

The reinforcement layers 20 and 21 are formed from the same, circular reinforcement wires 25. These are made of steel, Stainless steel or aluminum. The armoring wires 25 are in Sealing layer arranged around the cable core 12, whereby the Reinforcement layers 20 and 21 closed protective sheaths around the Form cable core 12 around. The reinforcement layers 20 and 21 of the Submarine cables 10 have different diameters. This come despite the same diameter of the reinforcement wires 25 in that the outer reinforcement layer 21 a has a larger number of reinforcing wires 25 than the inner one Reinforcement layer 20. The reinforcement wires 25 individually or all Reinforcement layers 20 and 21 are preferably in themselves stranded in a known manner. This also applies to the reinforcement wires 16 to form the reinforcement layer 15 in the cable core 12 of the submarine cable 10 and / or 11.

In the case of submarine cables that run along a non-uniform path Cable routes are not laid at different depths to have to armor the entire submarine cable, the level of the laying train occurring at the greatest water depth holds, the submarine cable has different reinforcements. In the embodiment shown, it is about Reinforcements 18 and 19. Reinforcement sections from the reinforcements 18 and 19 are fair in the requirements, especially in coordination with the cable route, the length of the submarine cable arranged. It always runs same cable core 12 continuously over the entire length of the Submarine cables, i.e. continuously over the individual successive ones Reinforcement sections. Where the armor section how the armor 18 is formed, that has Submarine cable over a cross section of that shown in FIG. 1 Submarine cable 10. Where the armor section has the armor 19, is the submarine cable in cross section like the submarine cable 11 of the Fig. 2 formed. The one on the continuous Cable core 12 successively arranged different Reinforcement sections preferably have continuous Reinforcement wires 25 in the inner reinforcement layer 20 but it is also that the reinforcing wires 25 only over extend the respective reinforcement section and in the transition area 28 are interconnected. The outer reinforcement 19 of the reinforcement section having two reinforcements 18, 19 ends in the transition region 28 between successive ones Reinforcement sections.

Because the adjustment of the submarine cable to different loads So far, only a different one along the cable route Number of reinforcement layers 20 or 21 is possible, is necessary accepted an oversizing. The Invention wants to avoid this by going along such Reinforcement sections of the submarine cable 10 and 11, in which the Reinforcement 18, 19 is not fully loaded, one corresponding number of reinforcing wires 25 is replaced by filling strands 31. Preferably only reinforcing wires 25 of the outer reinforcement layer 21 replaced by filler strands 31. Depending on the load condition of the submarine cable 10, a more or less large number of reinforcing wires 25 at least partially replaced by filler strands 31. It is conceivable, only a section of a single reinforcement wire 25 through one to replace the corresponding section of a filling strand 31. But it is also possible to have at least sections of all Reinforcement wires 25 or all reinforcement wires, preferably the outer reinforcement layer 21, through filler strands 31 to replace.

By varying the number of armoring wires to be replaced 25, the length of the sections of the armoring wires to be replaced 25 and the positioning of these sections along the Total length of the submarine cable 10, it is possible by appropriate Filling strands 31, the reinforcement 18 of the submarine cable 10 adapt individually to the needs. The reinforcement 18 then has a needs-based resilience, whereby Oversizing beyond the level of security required are eliminated. 1 shows a cross section through an area of the submarine cable 10 in which four reinforcement wires 25 are replaced by filler strands 31. Are each two filling strands 31 lying next to each other diametrically on themselves opposite areas of the outer reinforcement layer 21 distributed.

The filling strands 31 are formed from a less tensile strength Material that is additionally or alternatively limp. Filling strands made of plastic meet these requirements 31. It can be thermoplastic, unreinforced Trade plastics, but also reinforced plastics, especially fiber reinforced plastics, for example glass fiber reinforced plastics. Such filling strands 31 are lighter than the armoring wires 25, which reduces the weight of the Submarine cable 10 by adapting the armor 18 to the prevailing pressure conditions can be reduced.

It is also intended to replace several Reinforcing wires 25 in the longitudinal direction of the submarine cable 10 gradually increasing the number of reinforcing wires 25 to provide replacing fill strands 31. All filling strands 31 or Groups of several filling strands 31 are then different long. This way the mechanical resilience the reinforcement 18 in the longitudinal direction of the submarine cable 10 and after increased or decreased. This creates an im essential continuous transition between different Reinforcements with high pressure resistance 18.

The reinforcement wires 25 are replaced by filler strands 31 during the manufacture of the submarine cable 10 by where one respective reinforcing wire 25 replaced by a filler strand 31 is to be cut, the armoring wire 25. The place the missing section of the respective reinforcement wire 25 then takes over a corresponding filler strand 31 Purpose, the respective filling strand 31 has dimensions, in particular a cross section that corresponds to the cross section of the replaced armoring wire 25 corresponds. If a round To replace armoring wire 25 with a certain diameter , the corresponding filler strand 31 also has one round cross-section with the same or approximately the same diameter on. Once a section, along the length of the reinforcing wire 25 is replaced by the fill strand 31 ends, the fill strand 31 cut off and it follows in the longitudinal direction of the submarine cable 10 again the armoring wire 25 each reinforcement wires 25 of a certain length through filler strands 31 of the same length replaced.

Wherever inside the reinforcement 18 on a reinforcement wire 25 a filling strand 31 follows or after a filling strand 31 again a reinforcing wire 25 is arranged, a connection is made the mutually facing ends of the respective reinforcement wire 25 and the associated filling strand 31. This connection can through a pipe section, namely a thin-walled sleeve 32 take place (Fig. 4). The sleeve 32 can be of various types Materials are formed. It preferably consists of a Material that matches the material of the respective reinforcement wire 25 is compatible, for example stainless steel, in particular stainless steel. In the sleeve 32 are from opposite Short end regions of the reinforcing wire 25 and the sides inserted filler strand 31 to be connected, approximately so far that the mutually facing ends of the reinforcement wire 25 and the filling strand 31 approximately in the middle of the sleeve 32 itself meet or lie almost in front of each other. The connection of the Reinforcement wire 25 with the respective fill strand 31 through the Sleeve 32 is secured by a partially plastic Deformation of the sleeve 32, namely a crushing of the same. At least the sleeve 32 is in the end region of the fill strand 31 and the armoring wire 25 each once on one certain place squeezed together. A thin-walled education the sleeve 32, the wall thickness in FIG. 4 only to Is drawn thicker for the purposes of illustration the junction of the armoring wire 25 with the fill strand 31 only a slight and hardly annoying increase in diameter is available.

According to a further embodiment of the invention, the Submarine cables composed of several different ones Reinforcement sections, the cable core 12, however, continuously runs. The reinforcement 18 and the reinforcement 19 follow alternately one on top of the other so that different one after the other Reinforcement sections are created. The number of different There are no limits to the reinforcement sections. For example, submarine cables 10 and 11 with different Reinforcements 18, 19 follow one another several times. The Positioning and the length of the respective reinforcement sections corresponds to the course, especially the water depths and the nature of the seabed, the route on which the submarine cables are to be laid. Then there is one Area of the composite submarine cable that has a reinforcement section with reinforcement 19 from only one reinforcement layer 20 has in areas with low load. In areas However, there is a reinforcement section under greater loads with the stronger reinforcement 18 from two reinforcement layers 20 and 21. However, other reinforcement sections can also be used be combined with each other, especially those which have reinforcements in the structure, the number of Reinforcement layers and in cross section of the reinforcement wires 25 from the submarine cables 10 and 11 differ.

Where the reinforcement sections with different Reinforcements 18 and 19 meet, the thicker one Reinforcement section with two reinforcement layers 20 and 21 over Filling strands 31 are preferably only in the end region 29 outer reinforcement layer 21 filling strands 31 available.

Starting from the end of the outer reinforcement layer 21, the Fill strands 31 thereof gradually, i. H. along a transition section along the longitudinal axis of the continuous Cable core 12 replaced by reinforcing wires 25 again. The can for each individual filling strand 31 or each individual Reinforcement wire 25 happen, but also in groups of several Filling strands 31 or reinforcing wires 25. For example with a short distance behind the end of the submarine cable 10 short Sections of two on the circumference of the reinforcement layer 21 diametrically opposite filling strands 31 replaced by Reinforcing wires 25 and in succession at certain intervals another two filler strands 31 through reinforcing wires 25 continued, in addition to those already replaced Filling strands 31 lying filling strands 31. This happens long until the entire outer reinforcement layer 21 again consists entirely of reinforcing wires 25. To this A continuous transition from filler strands 31 created on armoring wires 25 and thereby the resilience the outer reinforcement layer 21 along one to the End of the subsequent region of the submarine cable 10 increased.

The formation of the outer reinforcement layer 21 at the end of the submarine cable 10 through only filler strands 31 ensures one light cohesion of a flexible plastic Filled strands 31 formed in the outer reinforcement layer 21. Um the transition of those ending in the transition region 28 butt Filling strands 31 of the outer reinforcement layer 21 of a reinforcement section to a reinforcement section with only one Reinforcing layer 20 (Fig. 2) to even out the Ends of the filling strands 31 flattened by softening or beveled. In this way, the ends of the fill strands 31 at the end of the outer reinforcement layer 21 of the submarine cable 10 be welded, whereby the filler strands 31 reliably in the outer reinforcement layer 21 are held together. On Wrapping the filling strands 31 to ensure their cohesion in the outer reinforcement layer 21 can then optionally omitted.

The invention is suitable for any type of cable and not only for the submarine cable 10 shown for example in the figures and 11. From a variety of successive, different Reinforcement sections on the continuous cable core 12 creates a submarine cable with the appropriate length and defined changing armouring with regard to the resilience of the Route along which the submarine cable is to be laid has been adjusted is such that more resilient reinforcement sections on such sections of the submarine cable are located have a greater depth and less resilience Reinforcement sections of sections of shallower water and can be assigned to a load that is not so high. It can be one of the prevailing conditions Manufacture submarine cables adapted to the reinforcement.

Reference symbol list :

10th

Submarine cable

11

Submarine cable

12th

Cable core

13

Cladding tube

14

optical fiber

15

Reinforcement layer

16

Reinforcement wire

17th

inner wrapping

18th

reinforcement

19th

reinforcement

20th

Reinforcement layer

21

Reinforcement layer

22

outer wrapping

24th

outer wrapping

25th

Reinforcement wire

28

Transition area

29

End area

30th

End area

31

Filling line

32

Sleeve

Claims (13)

Cable, in particular submarine cable, with a cable core preferably having a plurality of conductors and a reinforcement surrounding the cable core, which has reinforcement wires, characterized in that individual reinforcement wires (25) are replaced at least in regions by filler strands (31) made of a less tensile and / or flexible material . Cable, in particular submarine cable, with a cable core, preferably having a plurality of conductors, and a reinforcement surrounding it, comprising a plurality of reinforcement sections which have reinforcement wires, characterized in that in at least one reinforcement section, at least some reinforcement wires (25) of the reinforcement (19) are characterized by filler strands (31) a less tensile and / or flexible material are replaced. Cable according to one of the preceding claims, characterized in that the filling strands (31) have approximately the same cross section as the reinforcing wires (25) replaced by these filling strands (31), and in that the filling strands (31) are preferably formed from plastic. Cable according to one of the preceding claims, characterized in that in the course of the reinforcement (19) or the reinforcement sections the number of filler strands (31) replacing the reinforcement wires (25) changes, preferably the number of reinforcement wires (25) at the end of the relevant one Reinforcement section increases. Cable according to one of the preceding claims, characterized in that in the case of a reinforcement (19) comprising a plurality of reinforcement layers (20, 21) at least one reinforcement wire (25) of the outer reinforcement layer (21) is at least partially replaced by a filler strand (31), preferably the filler strands (31) are connected to the reinforcing wires (25). Cable according to one of the preceding claims, characterized in that filler strands (31) are arranged in the reinforcement section which has at least one reinforcement layer (21) more than the other reinforcement section and preferably the filler strands (31) are arranged in the outer reinforcement layer (21) . Cable according to one of the preceding claims, characterized in that the filler strands (31) extend to the end of the reinforcement section having the filler strands (31), which end projects towards another reinforcement section. Cable according to one of the preceding claims, characterized in that in the case of an armoring section having an end of the filler strands (31) facing the subsequent armor section, all armor wires (25) of the outer armor layer (21) are replaced by filler strands (31). Method for producing a cable, in particular submarine cable, wherein a continuous cable core is provided with at least one outer reinforcement, characterized in that the reinforcement (19) is formed from different reinforcement sections. Method according to Claim 9, characterized in that at least some of the reinforcing wires (25) of one reinforcing section in the region of an end to be connected to the other reinforcing section are replaced by filler strands (31) and the filler strands (31) are connected to those reinforcement wires (25) which are replaced by the filler strands (31), preferably end sections of at least some of the reinforcing wires (25) in outer reinforcement layers (21) are replaced by the filler strands (31). Method according to one of the preceding claims, characterized in that sections of the reinforcing wires (25) in the longitudinal direction of the cable, in particular submarine cables (10), are gradually replaced by the filler strands (31), preferably in such a way that individual longitudinal sections or groups of several longitudinal sections the filling strands (31) are of different lengths. Method according to one of the preceding claims, characterized in that a part of the reinforcement wires (25) of such a reinforcement section is replaced by filler strands (31) which has a larger number of reinforcement layers (20, 21), gradually towards the end of the reinforcing section, a constantly increasing number of reinforcing wires (25) of the outer reinforcing layer (21) is replaced in sections, preferably until all reinforcing wires (25) of the outer reinforcing layer (21) have been replaced by filler strands (31). Method according to one of the preceding claims, characterized in that all filler strands (31) of the outer reinforcement layer (21) of the relevant reinforcement section end in the region of the transition to the adjacent reinforcement section, preferably end essentially in a blunt manner.

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