EP0110664A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Improved method of renovating sewers
Assignee: Pirelli Construction Co Ltd
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Filing: 1983-11-23
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Granted: —
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Expires: 2003-11-23
Abstract
Abstract This invention relates to an improved method of relining a sewer especially a small diameter sewer with a plurality of lengths of pipe. From a control station remote from the sewer, pipes are moved up the sewer to the fixed lining. The pipe is then inductively fusion welded to the lining and the annulus between the pipe and the sewer is selaed with grout. All these operations are controlled from the control station. Also provided by the invention is a method of accurately locating laterals in the sewer and cutting holes in the pipe and accurately aligning these holes with the lateral to accommodate the lateral. Also provided is a grouting pump for forming grout in situ in the sewer.
Inventors
- 👤 Nigel Leonard Rice
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 19:28
CPC Classifications
E; E03; E03F; E03F3/00; E03F3/06; F; F16; F16L; F16L55/00; F16L55/16; F16L55/162; F16L55/1645; E03F2003/065
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
102 words
A method of relining a sewer from a fixed control station comprising passing a first length of pipe along the sewer from the control station to a predetermined starting position within the sewer to form a first length of lining, and subsequently repeating the steps of passing a further length of pipe along the sewer from the control station to a joint position wherein the further length of pipe abuts the sewer lining; and forming a permanent joint between the further length of pipe to the lining to extend the sewer lining, wherein all the steps are controlled from the control station.
Claim 2
Independent Claim
102 words
A method of relining a sewer from a fixed control station comprising passing a first length of pipe along the sewer from the control station to a predetermined starting position within the sewer to form a first length of lining, and subsequently repeating the steps of passing a further length of pipe along the sewer from the control station to a joint position wherein the further length of pipe abuts the sewer lining; and forming a permanent joint between the further length of pipe to the lining to extend the sewer lining, wherein all the steps are controlled from the control station.
Claim 3
Independent Claim
36 words
A method of relining sewers according to claim lor 2 wherein the lining pipes are thermoplastic and in which the joint between each further length of pipe and the lining is effected by induction fusion welding.
Claim 4
Dependent Claim
138 words
A method of relining sewers in accordance with claim 2, wherein each length of pipe includes at one of the ends a spigot and at its other end a socket, the spigot of a first pipe being a slidable fit into a socket of an adjacent pipe, the socket including on its inner surface an electrically conductive strip extending circumferentially around the pipe, and wherein each further length of pipe is passed along the sewer until the spigot of the further pipe lies within the socket of the adjacent end of the lining with the conductive strip lyingjbetween the lining and the further length of pipe, the joint being effected by inducing a current in the strip to cause fusion welding of the further length of pipe to the lining, the induction being controlled at the control station.
Claim 5
Dependent Claim
70 words
A method of relining sewers in accordance with claim 3, wherein each electrically conductive strip is coated by a polyethylene coating, so that when a current is induced in the strip the coating expands to seal between the spigot of the further length of pipe and the socket of the lining to prevent the entry of any water present in the sewer so that cooling of the strip is prevented.
Claim 6
Dependent Claim
143 words
A method of relining a sewer in accordance with claim 3 or 4 wherein the further length of pipe is passed along the sewer with an induction coil located within the pipe at a position aligned with the spigot of the pipe, the coil being connected to a power source and a volt meter at the control station, current being passed through the coil while the pipe is passed along the sewer; so that when the spigot of the further length of pipe is within the socket of the.lining, the voltage across the coil changes, whereby the volt meter deflects to provide an indication at the control station that the further length of pipe is in the joint position where the joint may be effected, the induction coil being removable from the sewer to the control station once the joint has been completed.
Claim 7
Independent Claim
55 words
A method of relining sewers in accordance with anyone of the preceding claims, wherein after the joint between the further length of pipe and the lining has been effected, the annular space between the further length of pipe and the sewer is filled with grout, the grouting being effected and conrolled at the control station.
Claim 8
Dependent Claim
66 words
A method of relining sewers in accordance with claim 6, wherein a grouting pump is passed along the sewer to grout the annular space between the lining and the sewer, the grouting pump being controlled at the control station, the grouting pump being connected to a nipple in the pipe, the connection between the nipple and the pump being detachable when the grouting has been completed.
Claim 9
Independent Claim
195 words
A method of relining a sewer in accordance with any one of the preceding claims, including the step of locating the approximate position of each lateral joining the sewer before the sewer is lined and wherein when the distance between the edge of the lining and the approximate . position of a lateral is less than the length of a length of a lining pipe such that the lateral will meet the sewer at a position lined by the next length of pipe, a hole is cut into the next length of pipe at the exact position of the lateral by the steps of,---locating the radial and longitudinal position of the lateral with respect to a reference point on the edge of the sewer linings, at the control station cutting a hole in the next length of pipe the same radial and longitudinal position with respect to a reference point on the length of pipe, passing the next length of pipe along the sewer to the joint position, and, aligning the reference point on the'length of pipe with the reference point on the lining whereby the hole in the pipe is aligned with the lateral.
Claim 10
Dependent Claim
123 words
A method of relining sewers in accordance with claim 8, wherein the exact radial and longitudinal position of the lateral is located by providing a cage within which a close circuit television camera is slidably mounted, the mirror being rotatably mounted on the cage, the cage having graduations to mark off longitudinal and radial distances from a reference point, the graduations being visible by the television camera by the cage being passed along the sewer until it is adjacent the lining, the camera and mirror being moved until the camera faces the lateral, the television camera being connected to a viewing screen at the control station so that the radial and longitudinal positions of the lateral may be noted at the control station.
Claim 11
Dependent Claim
118 words
A method of relining sewers in accordance with claim 9, wherein each length of pipe is passed along the sewer by using a winch, wherein to aid location of the lateral a rod is attached to the winch cable and passed through the sewer until the rod becomes fixed to the edge of the lining, the cage including along its length a cylindrical slot into which the rod slides when the cage is passed along the sewer to fix the cage with respect to the rod, the next piece of pipe having inserted into it an insert including a cylindrical slot, forming a reference point, the reference point of the lining by the rod entering the cylindrical slot.
Claim 12
Dependent Claim
73 words
A method of relining a sewer in accordance with claim 10, wherein the cut next piece of pipe is passed along the sewer with a close circuit television camera facing out of the hole, the camera being connected to the control station so that from the control station it may be checked that the hole is exactly aligned with the lateral before a joint is effected between the cut pipe and the lining.
Claim 13
Independent Claim
174 words
A method of relining a sewer in accordance with anyone of claims 8 to 11, wherei whein the cut pipe has been joined to the lining, the annulus around the pipe is grouted by, passing an auxiliary grouting bag along the sewer to a position within the cut pipe, the auxiliary grouting bag comprising a first flexible cylindrical bag having a hole in its side of generally elliptical shape around which is fixed a flexible shuttering bag, the shuttering bag being capable of being in two positions, a first position wherein the shuttering bag is totally enclosed within the cylinder, the cylindrical bag being placed within the cut pipe with the hole of the bag and the pipe generally aligned, pressure being applied from the control station to the shuttering bag to inflate the shuttering bag from its first position to its second position where it protrudes out of the cylinder into the lateral whereby the lateral is completely sealed off so that the annulus between the cut pipe and sewer may be grouted.
Claim 14
Dependent Claim
67 words
A method of relining sewers in accordance with claim 12, wherein the shuttering bag has a string attached to it and within the flexible bag is included a photocell so that when the shuttering bag is completely inflated correctly up, the lateral, the string is moved, whereby the photocell senses the movement to provide an indication at the control station that the shuttering bag is in position.
Claim 15
Dependent Claim
88 words
A grouting pump for mixing grout from at least two components in situ comprising at least two containers each container holding one of the two components, each container being coupled to a measuring means to measure a required quantity of the component, the measuring means delivering a measured quantity of each component to a mixing and delivering nozzle which mixes the components and feeds the grout out of the pump, and control means coupled to the measuring-means and the mixing nozzle to control the operation of the pump.
Claim 16
Dependent Claim
88 words
A grouting pump for mixing grout from at least two components in situ comprising at least two containers each container holding one of the two components, each container being coupled to a measuring means to measure a required quantity of the component, the measuring means delivering a measured quantity of each component to a mixing and delivering nozzle which mixes the components and feeds the grout out of the pump, and control means coupled to the measuring-means and the mixing nozzle to control the operation of the pump.
Claim 17
Dependent Claim
16 words
A grouting pump in accordance with claim 14, wherein the control means operates by air logic.
Claim 18
Dependent Claim
27 words
A grouting pump in accordance with claims 14 or 15, wherein one component is resin and a second component is isocyne 8, the grout being a polyurethane.
Claim 19
Dependent Claim
18 words
A grouting pump in accordance with claim 14, 15 or 16 wherein the measuring means includes a piston.
References Cited (Backward Citations)
No citation records indexed.
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