Implements or apparatus for applying pushing or pulling force – Method or apparatus for placement of conductive wire – Conduit snakes
Patent
1985-01-23
1986-07-15
Watson, Robert C.
Implements or apparatus for applying pushing or pulling force
Method or apparatus for placement of conductive wire
Conduit snakes
F21C 2916
Patent
active
046001760
DESCRIPTION:
BRIEF SUMMARY
The subject of the present invention is the production of a cable conduit system for the laying of cables, generally buried cables, of great factory length, for example waveguide cables.
As is known, the connecting of two factory lengths possessing waveguides involves a considerable outlay in terms of technology and expenditure. For this reason, efforts are made to keep these connection or splicing points to a minimum by manufacturing long lengths of cable, which can amount to 1,000 m or more.
The problem underlying the invention described here consists, then, in drawing such long lengths of cable into a cable conduit system in one pull, and doing so irrespective of the topographical conditions of the terrain in which the cable conduit system is laid and without making use of specialised or heavy equipment.
Experience now shows that coating the drawing element and the interior surface of the conduit with a lubricant is not sufficient to overcome the frictional forces arising, in accordance with the law e.mu..alpha., in the bends in the conduit, which are sometimes three-dimensional.
The conventional technique for laying cables in trenches makes use of cable-laying rollers to reduce these frictional resistances, particularly where the path of the cable undergoes a change of direction of a curvature.
The object of the present invention is to apply this technique to the special case of drawing cables into the cable conduit described, with the aim of providing a self-contained, complete and leak-tight pipeline system.
In accordance with this object, the invention relates to a method whose distinctive feature consists in the fact that the devices according to the invention are installed at points where the run of the cable conduit undergoes critical changes of direction or curvatures. These devices, which are leak-tight themselves, are also connected to the cable conduit in a manner which is tight against dust, water and moisture. Support rollers and guide rollers are arranged in various planes within the interior space of these devices.
The effect achieved by the invention is that a cable conduit manufactured in great lengths (for example 1,000 m), which is delivered ready-to-use to the construction site and is laid, there, can immediately be used for the drawing-in of cables. This conduit contains the drawing element necessary for drawing in the cable, and is treated in a manner such that the slip resistance of the conduit is low and the conduit and drawing elements are protected against corrosion.
One of the possible, non-limited types of embodiment consists, for example, of a high-density polyethylene pipe with galvanised steel wire laid therein and, if appropriate, containing lubricant which simultaneously imparts to the galvanised steel wire additional protection against corrosion.
Clearly, the invention relates to these devices, which are referred to as roller bends in the text which follows. These roller bends represent a completely novel commercial article.
For the sake of clarity, an exemplary embodiment is described in the text which follows, with reference to the attached figures:
FIG. 1: view of an open roller bend;
FIG. 2: view according to the section II--II in FIG. 1;
FIG. 3: view according to the section III--III in FIG. 1;
FIG. 4: side view of a partly open roller bend.
The axial sections of the cable conduits are designated (16) in the figures.
According to the invention, one or more such roller bends, according to the example in the drawing, are installed in the cable conduit at points of critical changes of direction or curvatures. The roller bend consists of two-half-shells (10) and (12), as a result of which it is not necessary to cut the drawing elememt located in the cable conduit when installing the roller bend. The two half-shells are held together by screws (14). The entrance to and the exit from the roller bend are so designed as to be able to accept the ends (16) of the conduit which has been cut at the critical point, and form a leak-tight seal with these by means of the gaskets (
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Cablerie d'Eupen", Aktiengesellschaft
Kabel- und Gummiwerke, Aktiengesellschaft abgekurzt
Kabelwerk Eupen", Manufactures de Cables Electrique et de Caoutc
Watson Robert C.
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