Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,...
Patent
1996-07-11
1998-07-07
Taylor, Dennis L.
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
138 97, 175 53, 405184, F16L 100
Patent
active
057758417
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for use in replacing particularly sewage piping by using a forced inserting method, the device comprising an impact member provided with a drawing tip, and a reamer breaking the pipe to be replaced, the rear portion of the reamer comprising means for fastening the pipe to be inserted, the supply hoses for the driving medium of the impact member being conducted through the pipe to be inserted, and at least one other tip attached to the reamer by means of an arm projecting sideways from the reamer for laying another pipe.
In connection with renovating piping, a forced inserting method refers to a method where an existing pipe, such as a water, sewage or gas pipe is replaced with a new pipe, which is drawn into the old pipeline by means of a suitable device. If the diameter of the pipeline is to remain unchanged, the drawing device comprises a reamer, which expands the hole, while advancing in the pipe, to such an extent that the device can draw behind it a pipe which has an internal diameter equal to or greater than the internal diameter of the old pipe. Conventionally, a cable wire is first drawn through the old pipe, and the device is attached from its drawing tip to this cable wire. The purpose of the cable wire is to cause the device to move in the right direction and to a certain extent to help it advance. The movement of the device inside the old pipe is provided substantially by an impact member or "mole" included in the device. These impact moles are conventionally pneumatically driven. For example European Published Application 0,086,567 and British Published Application 2,113,795 disclose such pneumatic devices.
The object of the present invention is to provide a new type of device for use in replacing particularly sewage piping by using a forced inserting method. By means of this device, a water pipe or a rainwater sewer can be renovated simultaneously with the sewage pipe. This is achieved by means of the device according to the invention, which is characterized in that the second tip comprises a front portion cutting the soil in a plough-like manner and a tubular rear portion for feeding the second pipe conducted through the pipe to be inserted to replace the old pipe and through the tubular rear portion of the second tip. In this embodiment, the second pipe is thus conducted first through the pipe to be inserted to replace the old pipe, and then it is turned back to the direction it arrived from by means of the second tip, and it remains there in the groove cut in a plough-like manner by the second tip. Thus, the second pipe does not have to slide in the groove cut for it when the drawing continues. Since the direction of the second pipe has to be changed in a relatively small space and thus with quite a small radius of curvature, the second pipe has to be naturally rather flexible. Pipes with a corrugated outer surface suitable for this purpose have recently come onto the market. Such a pipe is very well applicable as a sewage or protective pipe.
The drawing may be realized solely by means of energy from an impact member operating inside the sewage pipe to be renovated, but it is possible that the second tip comprises its own impact member, the supply hose or hoses for the driving medium of this impact member being conducted through the pipe to be inserted to replace the old pipe. Alternatively, the second tip comprises a hydraulic drilling tip, the supply hoses for the driving medium of this tip being conducted through the pipe to be inserted to replace the old pipe.
To prevent the second pipe from twisting too much around the centre line of the sewage pipe to be replaced, the second tip comprises hydraulic guides, the supply hoses for the driving medium of the guides being conducted through the pipe to be inserted to replace the old pipe. To make it possible to control the guides, i.e. to obtain information about the possible twisting of the second pipe around the sewer line to be renovated, the pipe to be inserted to replace the old pipe comprises a device,
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patent: 5192165 (1993-03-01), Torielli
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Oy Aineko AB
Taylor Dennis L.
LandOfFree
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