Measuring and testing – Inspecting
Patent
1995-03-07
1996-11-05
Raevis, Robert
Measuring and testing
Inspecting
H04N 718
Patent
active
055719775
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a process and a device for inspecting canals with a camera probe.
When inspecting sewers and suchlike it is known that a television camera can be mounted on a self-propelled carriage or on a push rod and introduced into the canal so that the wall of the canal pipe can be inspected with the television camera. For this purpose, the television camera is connected via a cable with a monitor installed outside the canal.
Alternatively, it is known that to clear blockages or to clean canals, a jetting lance fitted with jets can be introduced into the canal to clean the canal pipes with high-pressure water jets ejected from the jetting lance.
When inspecting canal systems there is sometimes a need not only to inspect the main drain, but also to penetrate with a camera probe into the subsidiary canals with a smaller cross-section branching off from the main drain.
For this purpose it is known that the camera can be mounted on a steerable carriage which can also be guided into the subsidiary canals. However, this is only possible with subsidiary canals which branch off sideways from the main drain. Subsidiary canals which branch off upwards or upwards at an angle from the main drain cannot be reached in this way. There is a further disadvantage in the fact that the friction resistance of the cable pulled along by the camera carriage increases considerably at the points where there is a change of direction, so that the tractive force of the relatively small, light camera carriage is not sufficient to advance deep into the subsidiary canals. Moreover, the camera carriage can easily be brought to a stop by obstructions.
In another prior art system, installed on the canal carriage which can be displaced in the main drain is a drivable drum on which is wound a semi-rigid push rod with which a small camera probe can be advanced into the subsidiary canals. However, even with this process, only relatively small penetration depths are reached because no great resistance to penetration can be overcome due to the flexibility of the push rod.
DE 38 03 274 A1 and DE 91 05 211 U1 disclose processes and devices for inspecting subsidiary canals according to the preamble of claim 1 and the first device claim 3 where a standard camera carriage is equipped with a deflecting frame with deflection and drive rollers with which the camera, which is disposed at the front end of a flexible shaft or a semi-rigid camera cable, whose lens is normally oriented forwards in the direction of the axis of the main drain pipe, can be deflected into a branching off subsidiary canal and then advanced into the subsidiary canal on the camera cable or the shaft. However, the above-mentioned problems also occur with this process, so that one can only advance into the subsidiary canal over a limited distance.
In DE 38 77 721 T2 a jet is described with which a camera carriage for inspecting canal pipes can be propelled forward according to the principle of reaction. However, this reaction-propelled camera carriage is not suitable for use in subsidiary canals because it is not sufficiently maneuverable and cannot be guided into branching off subsidiary canals, especially when the subsidiary canals branch off upwards at an angle from the main drain.
The invention is based on the task of providing a process and a device which allow the camera probe to be advanced deeper into the subsidiary canals branching off from the main drain and which allow any obstacles to be overcome.
This task is solved with the features indicated in claims 1 and 3.
According to the invention, the camera probe is fitted with reaction jets and is connected to a hose for supplying a pressure medium to the reaction jets. By driving the camera probe forward according to the reaction-propulsion principle, a high driving force can be achieved at low structural cost and with extremely small camera probe dimensions, so that the camera probe easily penetrates into narrow subsidiary canals and can also overcome steep slopes and pull along the camera cable and the hose for
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