Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
  • F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
  • F16L55/179—Devices for covering leaks in pipes or hoses, e.g. hose-menders specially adapted for bends, branch units, branching pipes or the like
• • E—FIXED CONSTRUCTIONS
  • E03—WATER SUPPLY; SEWERAGE
  • E03F—SEWERS; CESSPOOLS
  • E03F3/00—Sewer pipe-line systems
  • E03F3/04—Pipes or fittings specially adapted to sewers
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
  • F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
  • F16L55/162—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe
  • F16L55/165—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a pipe or flexible liner being inserted in the damaged section
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
  • F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
  • F16L55/162—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe
  • F16L55/165—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a pipe or flexible liner being inserted in the damaged section
  • F16L55/1657—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a pipe or flexible liner being inserted in the damaged section lengths of rigid pipe being inserted

Definitions

• This invention relates to a method of introducing grout between an outer pipe and an inner, lining pipe, and to apparatus for use in the said method.
• the invention is particularly applicable to grouting between and existing sewer pipe and a smaller diameter, plastics slip-lining pipe which has been placed inside the sewer to repair it when the diameter of the sewer pipe is too small to permit human access.
• a method of introducing grouting material into the space between an outer pipe and an inner lining pipe comprises the steps of: (i) providing a plurality of grouting holes in the inner pipe at longitudinally spaced locations; (ii) injecting liquid grouting material by remote
• OMPI P °* control into the space from the interior of the inner pipe through a first one of the grouting holes at least until the escape of grouting material from a neighbouring hole is detected; (iii) blocking the first hole to prevent the material flowing back into the inner pipe; and (iv) repeating steps (ii) and (iii) at subsequent grouting holes until a required length of piping has been grouted.
• Detection of the escaping grouting material from a hole ahead of the injection point may be performed by remote observation with a closed circuit TV camera inside the inner pipe.
• a closed circuit TV camera inside the inner pipe.
• the open holes also allow air to escape ahead of the grouting material.
• a relatively bng stretch of sewer piping can be reliably grouted with comparat ⁇ ively few excavated access points.
• a grouting valve for insertion in an aperture in a pipe wall comprises a hollow body having an inlet at one end and an outlet at the other end, the inlet communicating with the outlet via an internal connecting passage, and a movable blocking member for blocking the passage so as to prevent the flow of liquid grouting material from the outlet to the inlet but allowing the flow of liquid grouting material in the opposite direction, wherein the body further includes:- means for locating the valve in an aperture in at least two alternative positions; and a side opening positioned relative to the locating means so that in a first venting position of the valve the opening is exposed to the interior of the pipe to allow inward flow of liquid from outside the pipe through the opening to the interior, and so that in a second grout injection position the said opening is shut off by the pipe wall whereby the valve acts as a non-return valve preventing the said inward flow of liquid.
• the valve may be moulded from flexible plastics material, the locating means comprising flexible ribs or lips on the sides of the valve body so that the valve can be 'snap' located by pushing the valve body from within the inner pipe.
• the locating means comprising flexible ribs or lips on the sides of the valve body so that the valve can be 'snap' located by pushing the valve body from within the inner pipe.
• the valve Prior to grouting a length of piping several valves may be fitted, all in their first venting position. When grouting material is to be injected through one of the valves, the valve is pushed into its second position, preferably by the same remotely-controlled machine that is used to inject the grouting material. The machine would proceed in this manner along the inner pipe, pushing each valve into its second position and injecting grouting material until venting is detected at the next hole. In cases where the inner pipe is of a considerably
• valve in accordance with the invention has an elongate body with locating lips positioned so that the valve projects from the exterior surface of the inner pipe and acts as a stand-off spacer which bears against the existing sewer pipe during and after grouting.
• separate plain spacers may be fitted in additional holes in the inner pipe.
• a plug device which fits into an aperture cut in the inner pipe in registry with a branch pipe, the device comprising a flange for locating the device against the interior surface of the inner pipe, and an inflatable sealing member attached to the flange which, when inflated, extends outwardly from the flange for engaging the perimeter of the branch pipe opening. Once inflated, the device is self-supporting so that machinery used to fit it in the aperture can be withdrawn from the pipe.
• the flange lies on the inside of the inner pipe, leaving the interior of the pipe largely unobstructed to permit the passage of travelling sledges or trolleys.
• the seal member may take the form of an inflatable ring or
• OMPI toroid with a corresponding opening being provided in the flange.
• Figure 1 is sectional side view of a grouting valve fitted in a pipe wall
• Figure 2 is a partly sectioned side view of an " elongate grouting valve
• Figure 3 is sectional side views of a plain • 10 spacer
• Figure 4 is a sectional side view of a first plug device in position at a branch location
• FIG. 5 is a sectional side view of a second plug device having a central opening. 15
• grouting holes in an inner lining pipe 1 are each fitted with a plastics valve 2 so that the annular space 3 between the inner pipe 1 and an existing sewer outer pipe 4 can be filled with grouting 20 material through the valve 2 from a grout supply nozzle
• the grout supply nozzle 5 is attached to a remotely controllable carriage (not shown) which travels inside the inner pipe 1 and carries means for moving the nozzle into engagement with the valve, both to push
• the valve has an inlet end with an inlet opening
• passage 8 connects the inlet and outlet openings
• a ball 9 is situated in the passage to prevent liquid from flowing back through the inlet opening 6.
• Side openings 10 are formed in the side wall of the valve body 11 to allow the reverse flow of grouting material out of the annular space 3 when the valve is in its first venting position as shown by the arrow 12.
• the valve allows ' the escape of grouting material so that the operator can judge when the annular space 3 is filled between the venting valve and a neighbouring valve when grouting material is being injected.
• the valve In the venting position, the valve is located by a first projecting flexible lip 13, which snaps out to engage the exterior surface 14 of the pipe 1 when the valve is first fitted.
• the valve When grouting material is to be injected through the valve 2, the valve is pushed outwardly to a second, injection position in which a second, relatively stiff lip 15 engages the exterior surface 14 of the pipe. Now the side openings 10 are no longer in communication with the interior of the inner pipe 1 and the valve acts as a non-return valve, the ball 9 preventing any reverse flow when the supply nozzle is removed.
• the hole 16 in the lining pipe 1 is preferably slightly conical to improve the flow of grout from the side openings 10 when the valve is in its first position, and to prevent the valve from being pushed completely through the hole 16, the sides of the hole 16 engaging a corresponding conical surface 17 on the valve body.
• the valve body 11 is tapered at the inlet end to assist location of the supply nozzle 5, which has a
• the grout supply nozzle 5 may. include a pressure- sensitive valve or remotely controlled shut-off valve to prevent spillage when the nozzle is removed from the valve.
• flotation of the inner pipe 1 may be prevented by an elongated valve 2A.
• the valve is capable of being fitted into a hole 16 in more than one position so that it can act firstly as a vent for observing the extent to which grout has penetrated along the annular space 3, from an adjacent supply point, and secondly as a non-return supply valve.
• several locating lips 15A, 15B and 15C are provided to vary the extent to which the valve body projects into the annular space in the injection position of the valve depending on the distance between inner lining pipe and the existing sewer pipe.
• the length of the valve may be chosen to suit the spacing between the lining pipe 2 and the existing sewer pipe 3.
• the configuration of the valve may be chosen to suit the spacing between the lining pipe 2 and the existing sewer pipe 3.
• Q PI openings 10 may be varied, or additional lips provided to cater for larger spacings.
• plain spacers such as that shown in Figure 3 may be inserted into the lining pipe 1.
• This spacer 20 has no grouting passage or valve, its upper end being closed.
• a number of flexible lips 21 allow the spacer to be inserted from inside the lining pipe 1 to any of a number of positions depending on the spacing required.
• Plain spacers of this kind may be fitted not only in the upper wall of the lining pipe 1, but also in the sides or bottom at circumferentially spaced positions to provide positive all-round location of the lining pipe concentrically with the existing sewer.
• a plug device is inserted in an aperture 25 cut in the wall of the inner pipe 1 in registry with the branch pipe 26.
• a seal member in the form of an inflatable bag 27 is attached to a par -cylindrical flange plate 28 which engages the inner surface 29 of the inner pipe 1.
• the plate 28 is preferably a laminate of steel and rubber with the bag 27 being integral with an outer rubber layer 30.
• the plate 28 has a releasable fixing such as a bracket 31 for engaging a support member on a remotely controlled travelling sledge (not shown) .
• a nozzle 32 is provided for inflating the bag 27.
• This may be fitted in the plate 28 as shown, or may be arranged to connect with a releasable fitting attached to the travelling sledge. In the latter case the nozzle may incorporate a non-return valve to prevent escape of air from the bag when the air supply and sledge are withdrawn.
• the bag 27 is shown in its uninflated (dotted lines) and inflated (solid lines) positions. It will be seen that both the. annular space 3 and the branch 26 are blocked by the inflated bag. Liquid grout injected into the annular space 3 thus flows around the branch opening substantially without leakage, allowing uninterrupted grouting of the main sewer.
• the bag 27 When the grout has hardened, the bag 27 is deflated and withdrawn from the " pipe 1. A release agent may be applied to the outside of the bag 27 if necessary. " Where there exists the possibility of liquid accumulating in the branch 26 the seal member may take the form of a hollow toroid as shown in section in Figure 5. To allow liquid to drain from the branch 26 into the pipe 1 an aperture 34 is cut in the supporting flange plate 28 concentrically with the toroidal bag 33.
• the bag 33 is shown in Figure 5 in its inflated position with its outer wall blocking the annular space 9.
• the interior of the bag 33 is inflated via a supply nozzle 32 fitted in the plate 28.
• a valve 35 may be provided as shown so that the air supply used for inflation can be removed once the plug device, comprising bag 33 and plate 28, has been positioned and inflated.
• the nozzle 32 may also double as a support member whereby the plug can be
• OMPI coupled to a remotely controlled trolley or sledge for carrying the plug device to the required location.
• the seal member 33 is so shaped and so positioned on the plate 28 that it inflates upwardly, away from the plate as shown, the inner wall of the toroid being somewhat thicker and stiffer than the outer wall to preserve the central opening as the outer wall moulds itself to the pipe edges.
• a secondary advantage of this construction is that the bag, prior to inflation, can be pushed down through the aperture 34, to minimise its projection from the outer surface of the plate 28, thus reducing the chance of it catching on obstructions as it is carried along the pipe 1. Once the plate 28 is in position and inflation is commenced, the bag 33 automatically pops through the aperture 34 into the hole 25 in the pipe 1.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Health & Medical Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Hydrology & Water Resources (AREA)
• Public Health (AREA)
• Water Supply & Treatment (AREA)
• Lining And Supports For Tunnels (AREA)
• Pipe Accessories (AREA)

Applications Claiming Priority (4)

Publications (1)

Family

ID=26281703

Family Applications (1)

Country Status (2)

Families Citing this family (7)

Family Cites Families (3)

• 1983
  • 1983-01-12 WO PCT/GB1983/000002 patent/WO1983002490A1/en not_active Application Discontinuation
  • 1983-01-12 EP EP19830900426 patent/EP0098855A1/de not_active Ceased

Non-Patent Citations (1)

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