Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,... – Moving cable within pipe
Reexamination Certificate
2002-10-10
2004-09-07
Lee, Jong-Suk (Department: 3673)
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
Moving cable within pipe
C405S184000, C138S098000, C138S112000, C138S114000, C138S148000, C156S287000
Reexamination Certificate
active
06786677
ABSTRACT:
FIELD OF THE INVENTION
Canal or pipe system and process for rehabilitation of a canal or pipe system and for installation of a cable or empty tube into a canal or pipe system as well as device for installation of a cable or empty tube
BACKGROUND OF THE INVENTION
The present invention concerns a canal or pipe system with at least one installed cable and/or empty tube, a process for rehabilitation of a canal or pipe system, into which at least one cable or empty tube is installed at the inner wall of the canal or pipe system, a process for the installation of at least one cable or empty tube into a canal or pipe system, as well as a device for the installation of a cable or empty tube into a canal or pipe system during its rehabilitation.
Canal or pipe system, especially waste water canal systems or waste water pipe systems, respectively, in practice are often in need of rehabilitation. It is therefore obvious, to combine the repair measures with the installation of f.e. an optical fiber cable for telecommunication purposes into the waste water canal. The rehabilitation of a waste water canal network is an expensive project depending on the amount of damage, relative to the economic as well as the time expenditures. These expenditures which are already necessary will become significantly higher by a combined installation of f.e. telecommunications cables or empty tubes for subsequent installation of cables. It is customary during rehabilitation, to subsequently insert waterproof hoses into the canal system, which will waterproof damaged points, in order to avoid underground construction.
In some canal or pipe systems cables or empty tubes are already installed at the inner wall of the canal or pipe system. For these canal or pipe systems it can be necessary to rehabilitate due to damages or wear.
In DE 198 490 39.9 a process for fastening cables in canal or pipe systems is described, where the cable is anchored between two canal manholes. In this way, a sag of the cable can occur in partial areas of the canal or pipe system. The cable thus is exposed to environmental influences in the canal or pipe system.
From “KA Water Management, Waste Water, Waste” 2000 (47) No. 2, February 2000, pages 279 to 282 it is known, how to combine new installation of cables with rehabilitation activities. The cable can be fitted between knobs on a hose-like so-called inliner. The cable is hereby protected against mechanical and chemical stresses in the ring gap formed by the knobs.
SUMMARY OF THE INVENTIONS
It is the objective of the present invention, to provide a process for the installation of at least one cable or empty tube into a canal or pipe system that can be combined with the rehabilitation of the canal or pipe system.
Additionally, it is the objective of the present invention to provide a process for the rehabilitation of a canal or pipe system, where at least one cable or empty tube is already installed at the inner wall of the canal or pipe system.
It is also the objective of the present invention, to provide a cable or pipe system with at least one installed cable or empty tube, which is characterized by the respective cable or empty tube being protected against environmental influences and being exactly positioned.
Furthermore, it is the objective of the present invention, to provide a device for installation of at least one cable or empty tube into a canal or pipe system during its rehabilitation.
The objective concerning the process for installation of a cable or empty tube is solved by a process for installation of at least one cable or empty tube into a canal or pipe system, where at least one outer casing is placed into the canal or pipe system, where subsequently at least one inner casing is being placed by means of distancing elements, so that a ring gap is formed between the inner and outer casing, and where the cable or empty tube to be installed is placed with the inner casing in such a way that the respective cable or empty tube comes to rest in the ring gap.
The objective relative to the rehabilitation of a canal or pipe system is solved by a process for the rehabilitation of a canal or pipe system, where at least one cable or empty tube has been installed at the inner wall of the canal or pipe system, where at least one casing is placed into the canal or pipe system by means of distancing elements, so that a ring gap between the inner wall of the canal or pipe system and the casing is produced, and where the casing is placed in such a way, the respective cable or empty tube is arranged in the ring gap.
For the cables, power cables as well as control cables, data and/or general telecommunications cables can be used. These are f.e. optical fiber cables, which can transmit telecommunications or data, respectively, by means of optical fibers. For this purpose, the individual fibers or the thin optical fiber cables, respectively, are securely enclosed in the ring gap. The distancing elements, f.e. knobs, bulges and such, secure an equal distance and thus the maintenance of an equal ring gap.
Generally, defective waste water canal or pipe system are rehabilitated with the casings, without the necessity of underground work. For this, the casings, f.e. in the form of hoses, are pulled into the canal or pipe system to be rehabilitated. After insertion they are placed into the determined position and stabilized.
In the process of the new installation of a cable or empty tube, the outer casing forms thus the first protection layer at the damaged point of the canal or pipe system. Subsequently, the inner casing equipped with unilaterally extruded knobs is pulled into the outer casing together with the cable or empty tube. Since the cable is preferably very thin, one or even more cable strands can be placed between the distancing elements in the form of knobs, without having to decrease the canal cross-section or the formation of buckling. The cable or the empty tube, respectively, have the same coefficient of thermal elongation as the rehabilitation area of the casings, so that temperature stresses cannot occur either during installation or during operation.
For the process for rehabilitation of the canal or pipe system, the cable or empty tube, respectively, is already installed at the inner wall of the canal or pipe system. The ring gap is formed between the inner wall of the canal or pipe system and the inserted casing. Here also it is made sure, that the cable or empty tube does not rest on the inner wall of the canal or pipe system. Thus the inner active canal and pipe cross-section is not changed by the cable or empty tube, respectively.
The gap in the form of a ring gap measures f.e. 10 to 20 mm and serves for the reception of cables, preferably promising optical fiber cables (LWL cables). Even for relatively small and thin cables, higher fiber numbers (f.e. 144 optical fibers or more) can be contained in small cable diameters. The small diameters ensure, that no additional space is needed for accommodation of cables or empty tubes after rehabilitation of the canal or pipe system and that the symmetrical nature of the canal or pipe system is maintained.
The ring gap between the preferably concentric casings or between the inner wall of the canal or pipe system and a casing, respectively, is filled in the construction form with a filling medium, f.e. in the form of concrete for increasing static stability. The inserted cables or empty tubes, respectively, preferably have a high compression resistance and can therefore be placed directly into the special concrete. For increasing static stability, the cables or tubes are preferably surrounded by the filling material. Additionally, for a so-called micro cable the so-called PE jacket can be eliminated. Thus the metal tube of the cable is connected to the filling material tensionally and form-locking and thus further increases the static stability.
The objective relative the canal or pipe system is solved by a canal or pipe system with at least one installed cable and/or empty tube, where at least one casing is placed into the can
Finzel Lothar
Konig Hans-Jurgen
Schmager Klaus D.
CCS Technology Inc.
Lee Jong-Suk
LandOfFree
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