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
  • F16L55/162—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
  • F16L55/1652—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 the flexible liner being pulled into the damaged section
  • F16L55/1654—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 the flexible liner being pulled into the damaged section and being inflated

Definitions

• the present invention relates to rehabilitating existing pipelines of various lengths and diameters and, in particular, to a method for performing such rehabilitation.
• Underground pipe systems deteriorate over time as a result of degradation of materials and outside influences such as tree roots, compression from above, expansion
• PVC polyvinylchloride
• the liner is fed into the existing pipe in a heated and softened form and then is
• Hot cure systems are also susceptible to shrinkage both longitudinally and
• the liner may move further along the pipe wall resulting in infiltration through the
• the water causes what is known as a "cold spot" in the hot cure method.
• This cold spot can inhibit the curing process which in turn leads to a failure ofthe line.
• liners also normally require two access points to the host pipe.
• the liner saturated with resin.
• the liner is turned inside out or inverted and then forced into position in the pipeline by pressurised water normally produced by a static head of water
• polyester resin systems are preferred.
• the present invention seeks to overcome or at least ameliorate the above problems
• the method includes the further steps of removing the bladder from the
• the liner is formed of a felt-like material.
• the bladder is coated with a release agent prior to insertion into the liner tube.
• the gaseous fluid is compressed air.
• the resin curing time may be adjusted by adjusting the ratios of base resin and
• the resin may be cooled below ambient temperature during the set up process.
• Figure 1 shows a pictorial representation ofthe liner prior to insertion into the host pipe
• Figure 2 shows a sectional representation ofthe liner and bladder prior to insertion
• Figure 3 shows a sectional part cutaway representation ofthe liner inserted into the pipeline.
• Figure 4 shows a pictorial representation ofthe lining method where there is only a
• the liner 5 is typically a felt-like
• the felt is
• extruded tubes 7 are coated with a release agent and inserted inside the felt tube or liner 5 to form an inflatable bladder.
• the extruded tubes 7 are typically formed
• bladder 7 may be inserted in the liner 5 before or after the felt is stitched or vulcanised.
• lined is surveyed to access the length of pipeline to be lined and the location of any
• junction distances are then marked on the liner 5 and a thin
• This additional tubing 9 is optional, but desirable, in that it prevents excess resin
• the liner 5 is next placed in a straight line on the ground and air plugs 10, 11
• Air is supplied to the air plugs by air line 3 and to the bladder 7 by air line 4. The end of
• the bladder 13 is spaced from the end ofthe liner 14 to prevent the end ofthe liner being
• the liner 5 is then inflated through one or both ofthe air plugs 10, 11.
• liner 5 is inflated sufficiently to form the desired shape ofthe pipeline 8 to be relined.
• liner 5 such that the resin impregnates into the liner material.
• the liner 5 can then be
• the bladder 7 is then inflated using compressed air. Once inflated, the bladder 7 may be
• deflated bladders 7 may be used inside the
• liner 5 as a form of security. Should the outer bladder fail through bursting or fails to
• the resin is then allowed to cure for the required time. During the curing process,
• the liner 5 is held against the inner wall 19 of the pipeline 8 by the pressurised bladder 7.
• the liner 5 is also attached to the inner wall 19 by means ofthe water resistant adhesive
• the bladder 7 is
• an electric drain cleaner can be used externally to cut the junctions from
• the liner 5 is
• bladder 7 are sealed to prevent escape of inflation air and a flow through plug 18 is
• method includes introducing a
• the liner 5 in the pipeline. This is shown in Figure 4.
• the liner 5 has one end 20 sealed.
• This end 20 is pushed toward the boundary trap 21 using hand rods (not shown) or the
• the liner 5 can then be inflated using the internal bladder 7 in the usual
• the cold cure technique enables long lengths of

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Lining Or Joining Of Plastics Or The Like (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=3789438

Family Applications (1)

Country Status (5)

Families Citing this family (10)

Family Cites Families (4)

• 1995
  • 1995-08-29 AU AUPN5110A patent/AUPN511095A0/en not_active Abandoned
• 1996
  • 1996-08-28 CA CA002230538A patent/CA2230538A1/en not_active Abandoned
  • 1996-08-28 EP EP96927455A patent/EP0850381A1/de not_active Withdrawn
  • 1996-08-28 WO PCT/AU1996/000538 patent/WO1997008487A1/en not_active Application Discontinuation
  • 1996-08-28 NZ NZ315541A patent/NZ315541A/xx not_active IP Right Cessation

Non-Patent Citations (1)

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