Pipes and tubular conduits – Repairing
Patent
1996-08-29
1998-07-14
Stryjewski, William
Pipes and tubular conduits
Repairing
138 98, F16L 5516
Patent
active
057789371
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates generally to construction, repair and modification of waste water drainage systems, and more particularly, to a method of making leak-proof sites of entry for domestic connection pipes and other feed pipes into waste water drainage systems.
2. Description of the Related Art
When constructing and renovating waste water drainage systems (e.g. sewers), it is very important that the sites of entry of feed pipes into a drainage system be leak-proof because leaking sewage can contaminate groundwater. Unfortunately, it is often very difficult to construct a leak-proof site of entry. For example, poor accessibility to the site of entry is a common problem in repairing or modifying a waste water drainage system. In most instances, drainage systems into which feed pipes enter, are not man-sized and generally are located below narrow streets with high traffic density. Traditional methods of repairing a drainage system or modifying a drainage system require excavating the area around the site of entry. The relatively high monetary costs of such earthwork are often increased by expenditures caused by traffic requirements, such as the provision of detours. Therefore, a need exists for a method to construct, repair and modify waste water drainage systems that avoids the costs associated with excavating the area around the site of entry and more importantly, provides a leak-proof site of entry that eliminates groundwater contamination from leaking sewage.
Various methods of making sites of entry of feed pipes into sewers have already been suggested. However, these methods insufficiently meet the object of providing well sealed sites of entry of the type discussed herein. For example, according to DE-A-37 00 883, in man-sized sewers which are provided with a lining made of bent plate elements, a hose-like, mortar-filled collar surrounding the site of entry is inserted between the sewer wall and the lining to form a leak-proof site of entry. The insertion of such a collar is hardly feasible if the sewer is not man-sized. Furthermore, it must be taken into account that the mortar filling of this hose-like collar will not permit this collar to snugly fit around all sealing sites, and thus leaks may still occur.
In EP-A1-403 773, annular or hose-shaped seals are provided between the inner pipe and the sewer wall at a site of entry of a lateral feed pipe in a sewer renovated with an inner pipe to avoid the penetration of waste-water coming from the feed pipe into the gap present between the sewer wall and the inner pipe. The insertion of such seals is difficult, and this technique requires that the pipe forming the lateral connection is fitted sufficiently leak-proof in the sewer wall. If such a leak-proof fit is not ensured, waste-water can leak into the surrounding soil.
EP-A1-350 802 describes a technique which provides for the insertion of an inner pipe into a main train of sewer pipes when renovating pipings into which feed ducts, e.g. from domestic connections, enter laterally, with the annular space formed between the original pipe wall and the inner pipe being filled with a mortar mass. At the sites of entry, apertures are formed starting from the interior of the inserted inner pipe by cutting through the wall of the inner pipe and the mortar layer, thereby forming a flow connection between the sites of entry and the main train of pipes. As a rule, the connection of the feed ducts with the main train of pipes remains in its original state and will not be changed even if moderate eccentricities occur when cutting out the apertures. Further, spraying a thin layer of artificial resin at the side faces of the transition may be considered. A thorough elimination of possible faults in the attachment of the feed ducts to the main train of pipes, however, is not provided for by this technique.
According to a further technique which is described in U.S. Pat. No. 4,728,223, after insertion of an inner pipe into the main train of pipes, apertures are cut
REFERENCES:
patent: 3950461 (1976-04-01), Levens
patent: 4029428 (1977-06-01), Levens
patent: 4245970 (1981-01-01), St. Onge
Klug Kanal-, Leitungs-und Umweltsanierungs- G.m.b.H.
Stryjewski William
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