GB2123111A - Repairing mains - Google Patents

Repairing mains Download PDF

Info

Publication number
GB2123111A
GB2123111A GB08217916A GB8217916A GB2123111A GB 2123111 A GB2123111 A GB 2123111A GB 08217916 A GB08217916 A GB 08217916A GB 8217916 A GB8217916 A GB 8217916A GB 2123111 A GB2123111 A GB 2123111A
Authority
GB
United Kingdom
Prior art keywords
main
existing
duct
new
mole
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB08217916A
Inventor
Francis Donald Wilson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
British Gas Corp
Original Assignee
British Gas Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by British Gas Corp filed Critical British Gas Corp
Priority to GB08217916A priority Critical patent/GB2123111A/en
Publication of GB2123111A publication Critical patent/GB2123111A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
    • E21B7/205—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes without earth removal
    • E21B7/206—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes without earth removal using down-hole drives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
    • B29C63/26—Lining or sheathing of internal surfaces
    • B29C63/34—Lining or sheathing of internal surfaces using tubular layers or sheathings
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/28—Enlarging drilled holes, e.g. by counterboring
    • E21B7/30—Enlarging drilled holes, e.g. by counterboring without earth removal
    • 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
    • F16L55/1658—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 old pipe being ruptured prior to insertion of a new pipe

Landscapes

  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

In a typical example of the invention, the existing duct is a steel gas main which is to be replaced by a new plastics main. A mole is moved up the internal bore of the existing main and cutters with which the mole is provided engage the internal wall of the steel main and longitudinally slit the main at two diametrically opposite points thereon so that the main forms two semi-circular halves. The mole has a cylindrical body rearwardly of the cutters to which a new plastics replacement main is attached so that as the mole moves along the existing main it tows the new main into position within the existing main. The diameter of the mole body is such that it causes the two halves of the slit main to be moved radially outwardly to provide sufficient clearance for the new plastics main to be moved through the existing main. The internal diameter of the new main is equal to that of the existing main.

Description

SPECIFICATION Improvements in the replacement of ducts The present invention relates to the replacement or the preparation for replacement of an existing duct such as an existing gas main particularly of steel, with a new duct such as a plastics main.
According to the present invention, there is provided a method for replacing or preparing for replacement an existing duct with a new duct, the method comprising so treating the existing duct that there is sufficient clearance for movement through the existing duct of a new duct with an internal diameter equal to or greater than the internal diameter of the existing duct before treatment.
In a typical example of the invention, the existing duct is a steel gas main which is to be replaced by a new plastics main. A mole is moved up the internal bore of the existing main and cutters with which the mole is provided engage the internal wall of the steel main and longitudinally slit the main at two diametrically opposite points thereon so that the main forms two semi-circular halves. The mole has a cylindrical body rearwardly of the cutters to which a new plastics replacement main is attached so that as the mole moves along the existing main it tows the new main into position within the existing main. The diameter of the mole body is such that it causes the two halves of the slit main to be moved radially outwardly to provide sufficient clearance for the new plastics main to be moved through the existing main. The internal diameter of the new main is equal to that of the existing main.
CLAIM
A method for replacing or preparing for replacement an existing duct with a new duct, the method comprising so treating the existing duct that there is sufficient clearance for movement through the existing duct of a new duct with an internal diameter equal to or greater than the internal diameter of the existing duct before treatment.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (1)

  1. **WARNING** start of CLMS field may overlap end of DESC **.
    SPECIFICATION Improvements in the replacement of ducts The present invention relates to the replacement or the preparation for replacement of an existing duct such as an existing gas main particularly of steel, with a new duct such as a plastics main.
    According to the present invention, there is provided a method for replacing or preparing for replacement an existing duct with a new duct, the method comprising so treating the existing duct that there is sufficient clearance for movement through the existing duct of a new duct with an internal diameter equal to or greater than the internal diameter of the existing duct before treatment.
    In a typical example of the invention, the existing duct is a steel gas main which is to be replaced by a new plastics main. A mole is moved up the internal bore of the existing main and cutters with which the mole is provided engage the internal wall of the steel main and longitudinally slit the main at two diametrically opposite points thereon so that the main forms two semi-circular halves. The mole has a cylindrical body rearwardly of the cutters to which a new plastics replacement main is attached so that as the mole moves along the existing main it tows the new main into position within the existing main. The diameter of the mole body is such that it causes the two halves of the slit main to be moved radially outwardly to provide sufficient clearance for the new plastics main to be moved through the existing main. The internal diameter of the new main is equal to that of the existing main.
    CLAIM
    A method for replacing or preparing for replacement an existing duct with a new duct, the method comprising so treating the existing duct that there is sufficient clearance for movement through the existing duct of a new duct with an internal diameter equal to or greater than the internal diameter of the existing duct before treatment.
GB08217916A 1982-06-21 1982-06-21 Repairing mains Withdrawn GB2123111A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08217916A GB2123111A (en) 1982-06-21 1982-06-21 Repairing mains

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08217916A GB2123111A (en) 1982-06-21 1982-06-21 Repairing mains

Publications (1)

Publication Number Publication Date
GB2123111A true GB2123111A (en) 1984-01-25

Family

ID=10531188

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08217916A Withdrawn GB2123111A (en) 1982-06-21 1982-06-21 Repairing mains

Country Status (1)

Country Link
GB (1) GB2123111A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1985002215A1 (en) * 1983-11-10 1985-05-23 Merstan Impact Moling Limited Improvements in pipe laying and replacement
US4723873A (en) * 1985-07-23 1988-02-09 Ruhrgas Aktiengesellschaft Method and device for preparing an existing buried conduit for replacement by a new conduit
WO1991003673A1 (en) * 1989-09-06 1991-03-21 Institut Gornogo Dela Sibirskogo Otdelenia Akademii Nauk Sssr Method for trenchless replacement of a pipeline
WO1995022677A1 (en) * 1994-02-21 1995-08-24 Ilomaeki Valto An apparatus for drilling open a tunnel and drilling method
RU2484352C2 (en) * 2010-07-13 2013-06-10 Государственное образовательное учреждение высшего профессионального образования Самарский государственный технический университет Method to replace pipes in pipelines

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2092701A (en) * 1980-12-02 1982-08-18 British Gas Corp Replacing gas mains

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2092701A (en) * 1980-12-02 1982-08-18 British Gas Corp Replacing gas mains

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1985002215A1 (en) * 1983-11-10 1985-05-23 Merstan Impact Moling Limited Improvements in pipe laying and replacement
US4648746A (en) * 1983-11-10 1987-03-10 Water Research Centre Pipe laying and replacement
US4723873A (en) * 1985-07-23 1988-02-09 Ruhrgas Aktiengesellschaft Method and device for preparing an existing buried conduit for replacement by a new conduit
WO1991003673A1 (en) * 1989-09-06 1991-03-21 Institut Gornogo Dela Sibirskogo Otdelenia Akademii Nauk Sssr Method for trenchless replacement of a pipeline
WO1995022677A1 (en) * 1994-02-21 1995-08-24 Ilomaeki Valto An apparatus for drilling open a tunnel and drilling method
RU2484352C2 (en) * 2010-07-13 2013-06-10 Государственное образовательное учреждение высшего профессионального образования Самарский государственный технический университет Method to replace pipes in pipelines

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)