EP0082223A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Lining underground conduits
Assignee: Demco Ltd
•
Filing: 1981-12-21
•
Granted: —
•
Expires: 2001-12-21
Abstract
Abstract The invention relates to the lining of underground conduits and, in particular, to the relining of damaged sewer conduits. The conduit is lined by the use of lengths of pipe (20) which are such that they can be located across the conventional vertical access opening (13) to the conduit. Successive lengths of pipe are interconnected by screw-threaded engagement and are drawn along the conduit by a traction cable (22). Connection of the pipe lengths takes place in the base of the access opening. The pipe lengths are of rigid plastics and when connected present smooth internal and external surfaces.
Inventors
- 👤 John Anthony Howley
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 05:14
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/16; F16L55/162; F16L55/165; F16L55/1657
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
73 words
A method of lining buried conduits characterised by gaining access to the conduit (10) through generally vertical openings (13) and inserting lengths of cylindrical pipe (20) into the conduit, the lengths of pipe (20) being interconnected by screw-threaded engagement and the connection of successive lengths of pipe being made in said vertical openings (13) so that each successive length of pipe is connected to a length of pipe already positioned in the conduit.
Claim 2
Independent Claim
73 words
A method of lining buried conduits characterised by gaining access to the conduit (10) through generally vertical openings (13) and inserting lengths of cylindrical pipe (20) into the conduit, the lengths of pipe (20) being interconnected by screw-threaded engagement and the connection of successive lengths of pipe being made in said vertical openings (13) so that each successive length of pipe is connected to a length of pipe already positioned in the conduit.
Claim 3
Dependent Claim
38 words
A method according to claim 1 characterised in that the lengths of pipe (20) are drawn along the conduit (10) by traction means (22) connected to one end (21) of interconnected lengths of pipe (20) in the conduit.
Claim 4
Dependent Claim
54 words
A method according to claim 2 characterised in that the lengths of pipe (20) are drawn from one vertical opening (13) towards another vertical opening (l3) by said traction means (22), the traction means being located at said other vertical opening and including a cable connectable to said one end (21) of the pipe.
Claim 5
Independent Claim
35 words
A method according to any one of the preceding claims characterised in that the lengths of pipe (20) are dimensioned in their longitudinal direction to be locatable lengthwise across the vertical openings (13) during installation.
Claim 6
Independent Claim
44 words
A method according to any one of the preceding claims characterised in that the lengths of pipe (20) are non-metallic and each length includes screw-threaded male and female portions (24, 25) at opposite ends for the lengths to be sealingly connected to one another.
Claim 7
Dependent Claim
33 words
A method according to claim 5 characterised in that the ends of the lengths of pipe (20) are so formed that the interconnected lengths of pipe present contiguous cylindrical inner and outer surfaces.
Claim 8
Dependent Claim
26 words
7 . A method according to claim 5 or 6 characterised in that the thread form (24, 25) of the screw-threaded portions is rectangular in cross-section.
Claim 9
Independent Claim
30 words
A method according to any one of the preceding claims characterised in that the space (30) between the exterior of the pipe (20) and the conduit walls (10) is sealed.
Claim 10
Dependent Claim
25 words
A method according to claim 8 characterised in that the space (30) between the pipe (20) and the conduit (10) is injected with grouting material.
Claim 11
Dependent Claim
60 words
Pipe lengths for use in the method of any one of claims 1-9 characterised by lengths of plastics pipe (20) each with male and female screw-threaded ends (24, 25) and, when connected together, presenting smooth, uninterrupted inner and outer surfaces, the lengths of pipe (20) being dimensioned to be locatable lengthwise across access openings (13) to buried sewer conduit (10).
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.