Abstract: A tubular pipe lining material 1 is guided to first and second pressure chambers 50 and 55 and mounted on an eversion nozzle 55a that is provided at the lower end of the second pressure chamber. The pipe lining material is held by a holding jack 21 of the first pressure chamber, and is drawn into the second pressure chamber by the lowering of the first pressure chamber. When a prescribed length of the pipe lining material has been fed into the pressure chamber, the second pressure chamber is airtightly sealed, and the pipe lining material is everted and drawn out through the eversion nozzle by the action of fluid pressure in the second pressure chamber. Thereafter, the first pressure chamber is raised, and the same operation is repeated to successively evert and draw out the pipe lining material from the second pressure chamber.

Abstract: A lateral liner assembly provides for sealing of the junction between a lateral sewer line and a main sewer pipe. The lateral liner assembly includes a body portion attached to a collar portion. A flange assembly is secured to the collar to provide a rigid base for a seal. The seal supported on the flange seals against the inner surface of the main sewer pipe. The seal provides a desired water tight seal for the junction between the main sewer line and the lateral sewer line.

Abstract: A lining apparatus and method is provided that obviates the need for a bladder to press the liner against the host pipe. The lining apparatus may include an extension tube sealed to the liner at one of its ends with an inversion mechanism attached to the other end of the liner for inverting the liner to its desired position within the pipe to be repaired. The lining apparatus can also avoid the use of an extension tube by temporarily closing the liner during the inversion process so that the liner can be inflated when pressurized by a fluid and then sealing an open end of the liner after it has been inverted into the pipe.

Abstract: The method for identifying lateral pipes includes printing identifying indicia on the interior surface of a liner assembly positioned adjacent the lateral pipe. The apparatus includes the liner assembly in place with the identifying indicia visible from the interior of the pipe line.

Abstract: A method for repairing multiple conduits using a vacuum collapsed, elastic liner involves providing a quantity sufficient for multiple repairs to the work sight and inserting a length into the damaged conduit. The protruding liner is then heat-sealed to prevent volume flow between the inserted liner and the remaining liner. The inserted liner vacuum is broken enabling the inserted liner to reassume its original size and shape. In doing so the expanded liner seals the problematic breeches. A retaining sleeve is then inserted in the expanded liner to hold it in place.

Abstract: A system for liner tensioning according to embodiments of the present invention includes a tubular liner inside a pipeline from a front end of the pipeline to a back end of the pipeline, the tubular liner having a front end and a back end, the tubular liner coupled to the front end of the pipeline, the back end of the tubular liner extending from the back end of the pipeline, as well as a liner clamp coupled to the back end of the tubular liner, and a tensioning element coupled to the liner clamp and the pipeline, the tensioning element configured to apply a tensioning force between the liner clamp and the pipeline. The tensioning element may include one or more braces adjustable in length to accommodate pipes of varying diameters or different lengths of liner extending from the pipe.

Abstract: An apparatus and method for lining an underground conduit is disclosed. The apparatus 10 comprises: an annular frame 40 having a crown portion 42 and a base portion 49; a strip guide disposed around and supported by the annular frame 40, the guide arranged to guide a strip 12 around a helical path; a pair of strip pinch rollers mounted to the frame 40 at a position circumferentially about halfway between the crown portion 42 and the base portion 49; a drive assembly mounted to the frame for driving the strip 12 downwards into the helical path in a winding direction so as to present an incoming first edge to an adjacent second edge of a wound convolution of the strip; a liquid remover mounted to the frame, the liquid remover arranged to prevent liquid that has adhered to and ascended with the second edge from descending down towards the incoming first edge; and an extruder 80 mounted to the frame 40 for extruding a molten bead of plastic onto the strip 12 at a position just before said overlap.

Abstract: A method and reinforcing materials are developed for repairing underground water pipeline without excavation. The reinforcing materials, which have forcibly rolled to form a cylindrical shape is inserted into the pipeline. Then, it will be expanded to tightly seal the damaged or cracked inner wall areas of the pipeline. A series of guiding belts are employed for circumferentially mounting on the outer surface of the reinforcing materials to form a sleeve. Thus, it is smoothly inserted into the water pipeline by pulling one end. Once the sleeve is inserted into the pipeline, the sleeve is steadily expanded to seal and tighten the damaged area. Accordingly, the repair work is easily facilitated to seal the damaged area of the pipeline without excavation. The repair materials have formed as a simple sleeve with smooth inner surface for minimizing the finishing process, such as a cutting. Thereby, the leakage is efficiency prevented without disconnecting the water supply.

Abstract: There is provided a pipe lining method wherein a lateral pipe lining material and a main pipe lining material are securely joined. After a lateral pipe has been lined, a start liner is applied to the main pipe and a main pipe lining material is then inserted. A heating wire for melting the start liner is mounted on a surface of a flange of the lateral pipe lining material during or after lining of the lateral pipe. While the main pipe is being lined, the heating wire is heated to melt the start liner existing between the flange of the lateral pipe lining material and the main pipe lining material. When the resin in the main pipe lining material is cured, the main pipe lining material and flange of the lateral pipe lining material are integrated. This allows the lateral pipe lining material and main pipe lining material to be reliably joined.

Abstract: A tubular product has a tubular base layer, a tubular innermost layer made of plastic by continuous extrusion, and a tubular tie layer of foamed plastic between and adhered to the base layer and the innermost layer. The tie layer is made of melt processable adhesion plastic, is extruded simultaneously with the innermost layer against the base layer, and has better adhesions to the base and innermost layers than the base and innermost layers have to each other.

Abstract: An apparatus for slip-lining a pipeline with plastic pipe including a slip-line cable having four sections—a forward navigation section, an intermediate locking section connected to a back end of the forward navigation section, a rearward drive section connected to a back end of the intermediate locking section, and an impact driver connected to the rearward drive section. Also disclosed is a method for slip-lining a pipeline with plastic pipe.

Abstract: A process for lining an existing pipeline or conduit with a flexible resin impregnated cured in place liner by pulling in the liner and inflating an eversion bladder with air and curing the liner with flow-through steam without loss of pressure is provided. The bladder is stored in a pressure bladder canister coupled to a pressurized downtube and eversion elbow. The bladder is everted by introducing pressurized air into the canister As the bladder reaches the distal manhole, it enters a receiving canister where it is punctured while maintaining air pressure within the bladder a pinch valve between the downtube and elbow isolates the inverted bladder so that steam can be introduced into the bladder to cure the resin and exhaust through the receiving canister. The bladder is then removed and lateral service reinstated.

Abstract: An apparatus for defining a passageway through a composition between first and second locations. The apparatus has a cable pulling assembly and a support for the cable pulling assembly. The cable pulling assembly has a capstan assembly, with a part of the capstan assembly guided in movement around a first axis and engageable with a cable connected to a mole so as to cause a cable engaged by the part of the capstan assembly to be pulled as the part of the capstan assembly is driven around the first axis. The part of the capstan assembly has a circumferential groove, bounded by a surface and extending around the first axis, for reception of a cable to be pulled. The groove is configured so that a circumferentially localized force is applied by the groove surface to a cable operatively positioned in the groove tending to avoid circumferential slippage between the part of the capstan assembly and the cable operatively positioned in the groove.

Abstract: A method of inserting a cured in-place pipe from a cleanout includes positioning a lining along a portion of a length of a bladder, wherein the lining is frangibly connected to the bladder, inserting the bladder through the cleanout, to a position wherein the lining is within the pipe and does not block the pipe.

Abstract: A lateral pipe lining material comprises a tubular resin absorbing material impregnated with a setting resin, which has a flange at one end thereof and whose outer surface is coated with a highly airtight film. A sealing tube is detachably attached to the outer circumferential surface of the tubular resin absorbing material. The lateral pipe lining material is introduced inside a main pipe and its flange is brought into tight contact with the lateral pipe opening. The lateral pipe lining material including the sealing tube is then everted and inserted by fluid pressure inside a lateral pipe toward the ground level. After the setting resin is cured, the sealing tube is removed from the lateral pipe lining material. This enables the lining of a lateral pipe to always be performed reliably, regardless of the aboveground circumstances.

Abstract: A pipe lining material for lining the main pipe of a sewer has a soft tubular resin absorption material impregnated with a liquid thermosetting resin, and also has a biodegradable film applied to the external peripheral surface of the pipe lining material. The pipe lining material is everted and inserted in the main pipe, pressed against the internal peripheral surface thereof, and cured to line the main pipe. After the lining is complete, there is no need to peel away and dispose of the biodegradable film because the film that is left behind is naturally decomposed and removed by microorganisms residing within the main pipe. This allows lining work to be simplified and carried out in a shorter period of time, reduces operation costs, and improves the lining finish.

Abstract: The method for identifying lateral pipes includes printing identifying indicia on the interior surface of a liner assembly positioned adjacent the lateral pipe. The apparatus includes the liner assembly in place with the identifying indicia visible from the interior of the main pipe line.

Abstract: The present invention is an improved method for installing a liner to repair a pipeline. The method involves placing a flexible lining hose that is coated with a thermosetting resin into the pipeline. A quick setting resin is also applied to the interior walls of the pipeline wherein the resin has a high contrast pigment agent therein in order to facilitate identification of and reopening of the various service laterals. A calibration hose is introduced into the lining hose and pressurized fluid is injected therein. The fluid presses the lining hose against the interior surface of the pipeline and cures the first and second thermosetting resins. The curing of the resins bonds the lining hose to the pipeline to form a rigid monolithic composite structure having high mechanical strength.

Abstract: A method for reinforcing or repairing a pipe pulls a liner assembly with a flexible smooth bore liner and a semi-rigid helix that gives non-collapsible characteristics within the damaged pipe for both linear pipe sections and curved pipe sections. The existing pipe is first cleaned with a specially designed brush with two wooden spheres at each end of the brush to prevent snagging or jamming during brush operations. The liner assembly is then pulled through the total length of the pipe and anchored at each end with retaining sleeves, which are sandwiched and glued within the liner assembly and the inside diameter of the existing pipe.

Abstract: An apparatus and method for lining sewer pipes that utilize an adjustable form configured to conform to the shape and dimensions of the interior of a man-entry sized pipe line. The adjustable form can be used to position a sheet of liner material immediately adjacent the inner sewer walls. An air cushion system is utilized to reduce friction and drag between the sheet of liner material and form so that the liner sheet can be easily adjusted prior to bonding to the inner walls of the pipe line.

Abstract: In lining work in which a lining pipe R formed by spirally winding a strip-like member 500 consisting of an elongated sheet-form body is left in place inside a tubular culvert P, and a new lining pipe is additionally formed in front of this lining pipe that has been left in place, a lining apparatus S which has a flexible forming frame 1 consisting of link bodies is used. The strip-like member 500 is wound around the forming frame 1 by means of a joining mechanism part 7 attached to the forming frame 1, and a lining pipe R is formed while being forcibly folded inward utilizing the flexibility of the forming frame 1; at the same time, a back-filling material is injected into the inward-folded part. The inward-folded part later returns to its original state. Alternatively, the diameter of a small-diameter lining pipe R formed by winding around the forming frame 201 or 401 is expanded, and lining is performed with the back-filling material injected during this diameter expansion process.

Abstract: A deformed thermoplastic liner is drawn through a cut host pipe and split sleeve halves attached to it and then reformed to its cylindrical configuration using pressurized steam. The split sleeve halves are removed, and an adapter flange is fused onto a cut end of the liner portion. The split sleeves halves are then re-attached with the adapter flange between bolted flanges of the split sleeve halves and a section welded to the adjacent host pipe to provide a permanent pressure sealed connection. The lined host pipe can also be connected to a lateral pipe using a lateral extension fused to the rerounded liner and a third split sleeve half with a lateral pipe extension that receives the lateral extension and is attached to the lateral pipe, either directly, or through a second split sleeve.

Abstract: A method of advancing a mole to define a passageway through a composition between first and second locations spaced from each other a substantial first distance. The method includes the steps of: attaching the mole to a cable; providing a support; providing a cable pulling assembly on the support; and operating the cable pulling assembly to cause a pulling force on the cable to be continuously applied through the cable pulling assembly to the cable and therethrough to the mole to thereby cause the mole to be advanced in a path a substantial second distance at least partially over the first distance between the first and second locations.

Abstract: A method for reinforcing or repairing a pipe pulls a liner assembly with a flexible smooth bore liner and a semi-rigid helix that gives non-collapsible characteristics within the damaged pipe for both linear pipe sections and curved pipe sections. The existing pipe is first cleaned with a specially designed brush with two wooden spheres at each end of the brush to prevent snagging or jamming during brush operations. The liner assembly is then pulled through the total length of the pipe and anchored at each end with retaining sleeves, which are sandwiched and glued within the liner assembly and the inside diameter of the existing pipe.

Abstract: Devices and methods for streamlining the completion of work functions within a lateral pipe connected to a main pipe. A variety of different lateral devices may be used to aid in the process of relining the main or lateral pipe. A lateral location device is inserted into the lateral pipe prior to relining of the main pipe and is subsequently used to aid in the conventional cutting of the main-lateral interface. A lateral cutting device actually performs the main-lateral cutting process from within the lateral or from within the main. A lateral inspection device crawls up the lateral for inspection via camera. A lateral relining device aids in the placement of a liner used to reline the lateral pipe. Each of these interchangeable work functions may be optional performed by one or more lateral devices, often carried and inserted by a delivery device.

Abstract: An underground structure liner based upon an inflatable liner structure. An acid resistant layer is the innermost layer of an inflatable liner, and the liner is coated with epoxy resin on its outermost surface, the surface which contacts the existing walls of the underground structure. The outermost coated surface of the liner is constructed with a fibrous fleece layer for better retention of the epoxy and better adhesion of the epoxy to the walls of the underground structure. An added feature of the liner is a structure which also seals the liner to pipes entering the underground structure.

Abstract: A process for lining an existing pipeline or conduit with a flexible resin impregnated cured in place liner by pulling in the liner and inflating an eversion bladder with air and curing the liner with flow-through steam without loss of pressure is provided. The bladder is stored in a pressure bladder canister coupled to a pressurized downtube and eversion elbow. The bladder is everted by introducing pressurized air into the canister As the bladder reaches the distal manhole, it enters a receiving canister where it is punctured while maintaining air pressure within the bladder a pinch valve between the downtube and elbow isolates the inverted bladder so that steam can be introduced into the bladder to cure the resin and exhaust through the receiving canister. The bladder is then removed and lateral service reinstated.

Abstract: A method for providing a seal in an annular space between a rehabilitative pipe liner and a conduit wall is provided. Areas on the surface of a section of a conduit wall surrounding lateral connections are provided with an expandable sealing agent, preferably during an investigative and/or cleaning inspection of the conduit section and preferably without repeated withdrawal and insertion of equipment between the provision of the agent at successive lateral connections. The rehabilitative pipe liner is then installed in the conduit section and a curing agent or agents such as heat, visible light, ultraviolet light, chemical agents, sonic energy or other radiant energy means is applied to cure or form the rehabilitative pipe liner and to cause the expandable sealing agent to expand and fill at least a portion of the annular space that may exist between the rehabilitative pipe liner and the conduit wall.

Abstract: A method of re-manufacturing a composite riser section having a damaged original metal liner comprises inserting an expandable replacement liner into the bore of the composite riser section and positioning the replacement liner to cover the metal liner. An annular recess may be formed circumferentially into the damaged portion of the metal liner to accommodate the replacement liner. The replacement liner is radially expanded within the composite riser section and a seal is created to prevent fluid inside the composite riser from flowing around the replacement liner, through the damaged liner, and to the outside of the composite riser.

Abstract: Segments are successively coupled in the circumferential direction and the vertical direction to provide a rehabilitating pipe that rehabilitates an exiting pipe such as a manhole extending in the vertical direction. The segments are coupled in the vertical direction by stacking segments on previously assembled segments. A gap between the existing pipe and the rehabilitating pipe is filled with a filler after completion of the assembly as a rehabilitating pipe. The filler is hardened to integrate the rehabilitating pipe with the existing pipe as a compound pipe. With such an arrangement, the rehabilitating pipe can be laid by a simple method because the segments can be stacked on previously assembled segments using the segments' own weight.

Abstract: A method and apparatus for performing maintenance on sewer pipes using a thermal sensor. The method and apparatus may be applied to the reinstatement of lateral openings after a liner has been installed in a main pipe. The thermal sensor detects the location of the lateral openings by sensing the thermal conditions of the liner. The thermal condition of the portions of the liner that cover the lateral openings is different from the thermal condition of the rest of the liner. The apparatus and method is also applicable to detecting groundwater leaks in the main pipe, and is also applicable to inspecting exothermic chemical reactions in the main pipe, such as exothermic grout or epoxy used to seal the liner in the main pipe. The thermal sensor may be integrated into a camera assembly that includes a visual camera at one end and the thermal sensor at the other end. The visual camera is useful in those portions of the main pipe that are full of water.

Abstract: A section of a host pipe is removed, a flange is placed at one end of the host pipe section and split sleeve halves are secured to one another and at one end to the flange to cantilever the split sleeve from the end of the host pipe. A deformed thermoplastic liner is drawn through the host pipe and split sleeve and reformed to its cylindrical configuration by introducing steam under pressure. Once reformed, the split sleeve halves are removed, the end portion of the rerounded liner is cut and an adapter flange is fused on the end of the cut liner portion. The split sleeve halves are reapplied about the rounded liner with the flange on the adapter bearing against an end face of the flanges of the split sleeve. A cylindrical section is welded to the adjacent host pipe section and a flange thereof is bolted to the distal end flange of the split sleeve whereby a permanent pressure sealed connection is provided between a lined host pipe section and a non-lined host pipe section.

Abstract: A rehabilitating pipe having a flange at one end thereof is laid inside a first existing pipe so that the flange contacts an inner circumferential surface portion of a second existing pipe surrounding a portion where the first and second existing pipes intersect. A flange part of a flanged tubular member is adhesively fixed to the inner circumferential surface of the second existing pipe so that the flange part covers the flange of the rehabilitating pipe and the inner circumferential surface portion of the second existing pipe. A tubular part of the flanged tubular member is adhered to the rehabilitating pipe to thereby seal a gap between an inner circumference of the first existing pipe and an outer circumference of the rehabilitating pipe.

Abstract: Method and apparatus for installing a liner material into a host conduit such as, e.g., a sewer pipe, hydrocarbon pipeline, gas line, water line, industrial chemical pipe, or a saltwater line. The liner material may include a compression liner and/or a preliner that is attached to the inner wall of the host conduit to repair or reinforce the host conduit or separate the host conduit from materials transported within the new liner formed from the liner material. Curable resin, slurry, or cement can be placed between the liner material and the host conduit to affix the liner material into place. Before and during curing, a fluid such as air or water can be used to inflate the compression liner outwardly toward the host conduit.

Abstract: The present invention relates to a pipe liner assembly for sealing and rehabilitating the walls of an underground structure. The system includes an inflation bladder, a woven liner and a non-porous membrane. The woven liner has an inner surface adjacent the inflation bladder, an outer surface, and longitudinal edges. The liner also has a first fastener system adjacent the liner edges for releasably securing the liner edges so that the liner surrounds the bladder. The non-porous membrane is adjacent the outer surface of the liner. The membrane has longitudinal edges, and a second fastener system adjacent the membrane edges for releasably securing the membrane edges so that the membrane surrounds the liner. The present invention is also directed to an apparatus for curing a resin impregnated pipe liner, as well as methods of making and installing a reinforcing liner for an underground structure.

Abstract: Supports for routing cables in existing pipelines are flexible cable supports containing minimally one hollow passage to receive a cable, and are installed between an existing pipeline inner wall and a structural liner. The cable supports have an elongate cross-section transverse to their length and are of sufficient flexibility to conform to the interior wall of the pipeline.

Abstract: An apparatus and method for lining sewer pipes that utilize an adjustable form configured to conform to the shape and dimensions of the interior of a man-entry sized pipe line. The adjustable form can be used to position a sheet of liner material immediately adjacent the inner sewer walls. An air cushion system is utilized to reduce friction and drag between the sheet of liner material and form so that the liner sheet can be easily adjusted prior to bonding to the inner walls of the pipe line.

Abstract: A process for lining an existing pipeline or conduit with a flexible resin impregnated cured in place liner by pulling in the liner and inflating an eversion bladder with air and curing the liner with flow-through steam without loss of pressure is provided. The bladder is stored in a pressure bladder canister coupled to a pressurized downtube and eversion elbow. The bladder is everted by introducing pressurized air into the canister As the bladder reaches the distal manhole, it enters a receiving canister where it is punctured while maintaining air pressure within the bladder a pinch valve between the downtube and elbow isolates the inverted bladder so that steam can be introduced into the bladder to cure the resin and exhaust through the receiving canister. The bladder is then removed and lateral service reinstated.

Abstract: Apparatus for assembling a liner (25) from a plurality of longitudinal sections of flexible material (161, 162) having longitudinal edges adapted to be joined one to another to form the liner. The apparatus comprises a path means along which the longitudinal sections of flexible material can be conveyed in a laterally reduced condition, an assembly zone at which the longitudinal edges can be joined together to form the liner, and a guide structure (165) about which the flexible material (161, 162) can turn upon exiting from the path means to provide an inner section (171) and an outer section (173) turned back with respect to the inner section. The guide structure (165) presents a guide, surface (167) over which the longitudinal sections (161, 162) of flexible material can pass, the surface (167) being configured to facilitate spreading of each longitudinal section (161, 162) from the laterally reduced condition.

Abstract: A lining for sealing the junction region where a lateral pipe and a main pipe meet. It has a two-portion structure including a main portion for lining a portion of the main pipe and a lateral portion of resin absorbent material for lining a portion of the lateral pipe. The main portion is sized for application to the full circumference of a main pipe on both sides of the junction and has an aperture for alignment with the opening of the lateral pipe. The lateral portion is connected to the main portion where it defines said opening and is gathered on a first side of the main portion.

Abstract: A two-stage process for repairing pipes at elevated temperatures and at elevated pressure. The process comprises the steps of preparing and displacing a hose assembly within the pipeline needing repair. A pressure medium is then introduced into the hose assembly raising the first temperature to initiate and facilitate the cross-linking reaction, and then raising the temperature to a second temperature range and pressure to cure or harden the resin. Novel manifolds and access tubes which allow the practicing the process safely are also provided.

Abstract: A tubular system made up of a tubular, a liner in the tubular, and longitudinally oriented members, which may be disposed within channels in the liner. The members advantageously may be used for pulling a liner into a host tubular, and/or maintaining the structural strength of the liner. The members are continuous along the length of the plastic-lined tubular, and if applicable, through intermediary joints. The channels may be in the inner and/or outer surfaces of the liner. The members may be usable for carrying electrical current or signals, fiberoptic signals, or data communications; for heating the liner; and or for detecting faults in the liner and/or the host tubular.

Abstract: A polyurethane applicator (10) for spraying at high-pressures a liner on the inner circumferential wall of an existing conduit (C) to be rehabilitated. The applicator (10) includes a carriage (12) coaxially guided in the conduit (C) and an atomizer (16) rotatably mounted to the carriage (12) for rotation about the central axis thereof. The atomizer (16) is provided with a nozzle (62) through which the lining mixture is forced out while the atomizer (16) rotates and travels in conduit with the carriage (12).

Abstract: An hydraulic control arrangement (66) in association with a pipe relining machine Includes fluid pressure supply and return lines (32, 33), a motor controller (80) to control a motor (67) and a radial position controller. The radial position controller supplies fluid under pressure to a radial positioning arrangement (46) to set diameter of a relined pipe. The radial position controller has a first normally closed valve (83) supplying fluid under pressure to the radial positioning arrangement (46) and a second normally open valve (84) allowing fluid to be withdrawn from the radial positioning arrangement (46). The arrangement (66) allows the pipe relining machine to be withdrawn in the event of a failure.

Abstract: A robotic apparatus and method for treatment of system of conduits and lateral sub-conduits comprising a remotely controlled robotic vehicle which navigates main conduits which delivers a series of tools to locations within the conduit. The mule's tools comprise a variety of devices including a tape head and a transport housing for a second remotely controlled robotic vehicle, or mouse which can be deployed for traversing and treating sub-conduits. Further, a method to install one or more small diameter flexible elongate members, such as conductors or sheathes to the inside of the system of conduits comprises advancing an elongate member through the conduit system with the mule or mouse, anchoring the elongate member and then taping the elongate member with the taping head while retreating out of the conduit. Preferably the tape is pre-shaped to minimize wrinkling upon application and more preferably, greater security and tape bonding strength is achieved by spraying over the tape and elongate member.

Abstract: An installation assembly (20) for installing a liner (L) in a pipeline (P) comprises a double bladder assembly (22) including an inner bladder (26) having an installation end (26b) and a retrieval end (26c). An outer bladder (28) surrounds the inner bladder. The ends of the inner and outer bladders are coupled together adjacent the installation end via an inversion element (30). The inner bladder is coupled to an air source at its retrieval end and the outer bladder adjacent the retrieval end is free. Following installation and curing of the liner, the bladder assembly is retrieved by pulling on the retrieval end of the inner bladder, and upon retrieval, the outer bladder is inverted.

Abstract: An assembly for introducing a pipe liner into a sewer pipe includes a launcher defining a passageway through which a resin impregnated pipe liner and bladder tube assembly passes. An inflatable member mounted to the launcher assembly is actuatable between an inflatable condition and a deflated condition. The pipe liner and bladder tube are secured in place by expanding the inflatable member outward against the inner surface of the sewer pipe. Air pressure drives the bladder tube and pipe liner into the sewer pipe and the bladder tube remains in place until the pipe liner hardens.

Abstract: The specification and drawing figures describe and show one or more improved ditch liners removably assembled into an improved ditch liner system. The improved ditch liner system includes a first liner section and a second liner section. Both liner sections are formed with a plurality of tightly peaked arc-and-ridge corrugations. Also included is a novel and unique overlap connection assembly for removably connecting one liner section to another liner section. In addition, various ways for sealing the overlap connection assembly are included. The interconnected system of improved ditch liner sections may be secured in a ditch by one or more removable rods. This abstract is provided to comply with rules requiring an abstract that will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure, but this abstract is not to be used to interpret or limit the scope or meaning of any claim.

Abstract: For the purpose of fastening cables to the inner wall of a non-accessible waste-water pipe, an internal liner has been developed, which is constructed from at least two layers, the first layer, which rests against the internal wall of the pipe when in the laid condition, having a profile or empty spaces for receiving cables, and a second layer, of envelope-like type, which carries the first layer.

Abstract: The present invention relates to a method for repairing and reinforcing an underground pipe. The method of the present invention comprises the steps of inserting an inner mold made of flexible material through the interior of a reinforcing element including a fiber preform surrounded by impermeable inner and outer tubes made of the flexible material and combining the inner mold with the reinforcing element; positioning a combined element, which includes the reinforcing element and the inner mold, into the underground pipe to be repaired and reinforced; injecting and expanding the inner mold with and by high temperature fluid, and brining the reinforcing element into close contact with an inner wall of the underground pipe; injecting the reinforcing element with thermosetting resin; and removing the inner mold after the thermosetting resin has been cured.