Abstract: A laying method for cables, which consists of a conduit and electrical and/or optical information cables, which can be inserted in the latter, is proposed. The cables are laid in grooves of a laying foundation which follows the path of a switching network.

Abstract: In a method of laying a cable, or a pipe for the subsequent introduction of a cable, in a fresh-water conduit, the surface of the cable or pipe is cleaned during the laying process immediately before entering the fresh-water conduit.

Abstract: A cable for laying in plastic tubes for transporting gas or water is described that comprises a cable core assembly and a plastic sheath surrounding the cable core assembly, in which cable the plastic used for the plastic tube and the plastic for the sheath can be welded together.

Abstract: A method of installing a tubular member in an inaccessible cavity includes a step of cleaning the internal wall of the cavity, a step of bringing the tubular member into contact with retaining members, and a step of fixing the tubular member by pressing it against the wall of the cavity. The method comprises three successive phases. A first phase comprises the step of cleaning the internal wall of the cavity and a step of topographically surveying the internal wall of the cavity. A second phase comprises a step of determining a position on the internal wall for retaining members for retaining the tubular member and a step of installing on the internal wall retaining members for retaining the tubular member and fixing members for fixing the retaining members to the wall.

Abstract: For the purpose of fastening cables to the inner wall of a non-accessible waste-water pipe, an internal liner has been developed, which is constructed from at least two layers, the first layer, which rests against the internal wall of the pipe when in the laid condition, having a profile or empty spaces for receiving cables, and a second layer, of envelope-like type, which carries the first layer.

Abstract: For the purpose of laying telecommunications cable in a pipe a cable or length of cable has been developed which is formed from a spiral spring which has a diameter equal to or larger than the diameter of the pipe and a stiffness and possibly a spring force sufficiently strong for it to be pressed against the inner wall of the pipe in the installed state and thus maintaining a lasting laid state.

Abstract: For the purpose of repairing supply lines such as a wastewater pipe, a plastic hose has been developed which, in the clear state, has a diameter which is the same size as, or larger than, the diameter of the pipe in which it is to be inserted. This plastic hose is used to fix optical or electric cables against the inner wall of the pipe. For this purpose, the plastic hose is introduced into the waste-water pipe in a collapsed state, together with the cable, and is released when the desired positioning has been reached. The collapsed plastic hose will then regain its original shape and thereby fix the cable against the inner wall of the waste-water pipe.

Abstract: Described is an optical cable or cable element with a plurality of optical waveguide elements which are stranded together and each consist of several optical waveguides, collected into a bundle, and of a plastic covering surrounding the bundle with a maximum free space of 0.1 mm, and of a non-compressible filling compound filling the intermediate spaces between the optical waveguides, and with a layer of longitudinally aligned glass or plastic fibers surrounding the optical waveguide elements and with an extruded outer jacket of a polymer, the outer jacket compressing the layer radially.

Abstract: The invention relates to a method of installing cables, in particular glass-fiber cables, in drinking water pipes and also to a cable suitable for drinking water pipe installation. In order to avoid contamination of the cable and to exclude contamination of the drinking water, provision is made that the cable is covered with a protective sheathing that is stripped off prior to contact with the drinking water. A cable suitable for this purpose can be covered already during its production process with the strippable protective sheathing.

Abstract: In a method of laying a cable, or a pipe for the subsequent introduction of a cable, in a fresh-water conduit, the surface of the cable or pipe is cleaned during the laying process immediately before entering the fresh-water conduit.

Abstract: In an optical cable with a cable core composed of a multiplicity of strand elements and an outer sheath layer, the strand elements have a multiplicity of bundles arranged loosely in a first sheath. The bundles are composed of a multiplicity of unstranded optical waveguides running parallel to each other, which are tightly encircled by a second closely thin-walled sheath.

Abstract: The invention relates to a cable holding means within a pipe (1) having at least one holding element, which is secured on the inside wall (2) of the pipe (1), and at least one clamping element (4), which is secured on the holding element for the purpose of receiving the cable (5) or the cable bundle. In order for the cable or cable bundle to be held simply and reliably even when the course of the cable is highly curved, it is provided for the clamping element (4) to be secured on the holding element such that it is rotatable about a radial axis of the pipe (1).

Abstract: In the laying of communications cables in the interior of pipes, in which hot substances are conveyed, it is important to provide communications cables of this type with long-term protection against the surrounding aggressive heat. The communications cable is not laid directly in contact with this aggressive hot environment in that at least one continuous cavity is arranged around the cable core of the said communications cable, which cavity is sealed by a sleeve. In order to be able to extract heat which inevitably diffuses over time from the hot environment into the said cavity, a medium is advantageously conveyed through the cavity. Only in this way is it possible to maintain a constant temperature around the cable core on a long-term basis and to accordingly obtain a long-life communications cable laid, for example, in district heating pipes.

Abstract: An optical flat cable with two optical waveguide elements and at least two tension/compression elements is described, the optical waveguide elements and the tension/compression elements being arranged in a common sheath. The optical waveguide elements (are arranged in the sheath spaced from one another, and in each case at least one tension/compression element is arranged extending in parallel to, and in the direct vicinity of, each optical waveguide element.

Abstract: Described is an optical cable or cable element with a plurality of optical waveguide elements which are stranded together and each consist of several optical waveguides, collected into a bundle, and of a plastic covering surrounding the bundle with a maximum free space of 0.1 mm, and of a non-compressible filling compound filling the intermediate spaces between the optical waveguides, and with a layer of longitudinally aligned glass or plastic fibers surrounding the optical waveguide elements and with an extruded outer jacket of a polymer, the outer jacket compressing the layer radially.

Abstract: An optical cable with one or more fiber optics conductors (4) that are located in a strand (1) with a polypropylene envelope or in a polypropylene support element (8), as well as with an outer jacket (6). The polypropylene contains a fire-retardant additive, the basis of which is an ammonium polyphosphate, and the jacket (6) is made of a halogen-free, flame-resistant material.

Abstract: An elongated optical element is proposed with a core (2, 11), with several optical transmission units extending in the longitudinal direction of the element and affixed to the surface of the core (2, 11) with a layer (3,13) of a hot-melt adhesive, the layer (3,13) extending through cavities (7) disposed between the surface (6,14) of the core (2,11) and the transmission units, wherein the hot-melt adhesive can swell in water and wherein the layer thickness of the hot-melt adhesive is less than the diameter of the transmission units. Also described is a method for fabricating the element.

Abstract: In a method for producing an optical cable (1), at least one optical fiber (3), is surrounded by an extruded tubular sheath (5) which comprises an inner layer (7) and an outer layer (9) and is produced in a single operational step. Tension elements (11, 11') are embedded in the tubular sheath (5) for increasing the tensile strength of the tubular sheath (5). The optical cable made by the method of the invention is particularly suited for applications as an indoor cable and as a non-self-supporting cable for installation on ground wires or phase wires of high voltage transmission lines.

Abstract: An optical fiber cable (1) or an optical fiber element has a number of superimposed and adjacent stacks of optical fiber ribbons (3) containing optical fiber ribbons (11), as well as an outer jacket (7). The stacks of optical fiber ribbons (3) are arranged over and/or adjacent to each other and in parallel. Such a construction of an optical fiber cable or an optical fiber element makes a particularly high packing density of the optical fibers possible, so that the optical fiber cable or the optical fiber element can have small outside dimensions even when it contains a large number of optical fibers.

Abstract: A communication cable includes a plurality of strands that are interconnected by cross pieces which can be easily separated from each other such that each strand can be used as independent cables. At least one strand of the communication cable includes at least one electrical communication line and at least one optical communication line.