EP0182551A2 - Maulwurf - Google Patents

Maulwurf Download PDF

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Publication number
EP0182551A2
EP0182551A2 EP85308116A EP85308116A EP0182551A2 EP 0182551 A2 EP0182551 A2 EP 0182551A2 EP 85308116 A EP85308116 A EP 85308116A EP 85308116 A EP85308116 A EP 85308116A EP 0182551 A2 EP0182551 A2 EP 0182551A2
Authority
EP
European Patent Office
Prior art keywords
mole
vibrator
cone
ground
tool
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.)
Granted
Application number
EP85308116A
Other languages
English (en)
French (fr)
Other versions
EP0182551A3 (en
EP0182551B1 (de
Inventor
Alec Reginald Carruthers
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.)
ALH Systems Ltd
Original Assignee
ALH Systems Ltd
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 ALH Systems Ltd filed Critical ALH Systems Ltd
Publication of EP0182551A2 publication Critical patent/EP0182551A2/de
Publication of EP0182551A3 publication Critical patent/EP0182551A3/en
Application granted granted Critical
Publication of EP0182551B1 publication Critical patent/EP0182551B1/de
Expired legal-status Critical Current

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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
    • E21B7/28—Enlarging drilled holes, e.g. by counterboring
    • E21B7/30—Enlarging drilled holes, e.g. by counterboring without earth removal
    • 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
    • E21B7/24—Drilling using vibrating or oscillating means, e.g. out-of-balance masses
    • 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
    • E21B7/26—Drilling without earth removal, e.g. with self-propelled burrowing devices

Definitions

  • This invention relates to moles, which are tools for forming, clearing or enlarging bores in the ground.
  • the present invention concerns a mole which aims to allow increased rates of operation in the renewal (and, optionally, the uprating) of pipelines and which is also useful to penetrate where no previous duct existed; that is, it can be used to penetrate the ground to form a new pipeline bore or even to form vertical or inclined bores.
  • the mole according to the invention is adapted to be drawn or pushed into or through the ground (either through solid ground or through an existing duct in the ground). It has a conically divergent leading part which has a rotary vibrator mounted within it.
  • Such vibrators are known per se and are comparatively simple devices in which a weight is rotated eccentrically, to develop severe radial vibrations through the creation of out-of-balance forces in the radial plane. They are conventionally used for example in screening (sieving) conveyors, road rollers and to dislodge loads from tipping vehicles. They may be mechanically, electrically, pneumatically or hydraulically driven and for the present purposes a pneumatically driven such rotary vibrator is preferred.
  • the rear surface of the conically divergent leading part of the tool offers a rearwardly facing opening into which the body of a vibrator tool is push fitted and is then axially retained by fitting a removable plate behind it.
  • Motive power for the tool such as compressed air is fed to it from behind the tool (that is to say through the passageway which it has opened up as it progresses), or from the front.
  • Forward motion of the tool may be caused either by a ram behind it or more usually from a rod or cable drawn in front of it.
  • a cone angle of inclination of 10-20°, more preferably about 15° is found to be suitable, although other greater angles may be used.
  • the eccentric force developed by the vibrator and the amplitude of radial vibration as well as its frequency may range widely according to the ground conditions encountered and/or the nature of the pipe which is to be broken up (when renewal is involved). For example, centrifugal force of between 5 kNs and 60 kNs may be developed with vibration amplitudes between 1 mm and about 7 mm at vibration frequencies of between 9,000 and 15,000 per minute.
  • a steel cone 1 has an axial void through its centre, the leading end of which 2 is enlarged to receive the tail end of a traction rod 3 coupled to the cone by a pin 4.
  • a circumferential wall of which has a land 6 which is a push-fit onto the outer surface of the body 7 of a rotary vibrator 8.
  • the vibrator 8 fits snugly against blocks 9 on an axial wall of the enlargements and at its other axial end similar blocks 10 are held against the rear end of the vibrator by an annular retaining plate 11 held to a rear face of the cone by bolts 12.
  • the tool has a cylindrical wall 12 the rear end of which may be used for the attachment of a pipe liner to be drawn through the hole in the ground formed, enlarged or cleared by the tool.
  • the vibrator 8 is of a type known per se with a pneumatic motor rotating an eccentric tubular weight. Air at appropriate pressure is fed to the motor through pipeline 15 which follows the tool along the bore which it forms. The source of air is conveniently at ground surface.
  • Vibtec VE120 vibrator provided with air at 140 cfm (cubic feet per minute)-at various pressures was fitted in the structure seen in Figure 1.
  • the mole was pulled by a rod drawn by a Petersen hydraulic rodding unit from an excavation made ahead of the tool the traction rod being pushed through.to the tool attached by a pin 4 and then drawn back.
  • the power pack of the rodding unit was operated at various pressures with and without the vibrator in operation.
  • the cone was 250 mm diameter, with a cone angle of 15°.
  • the cone was tested through a bed of blue clay at a depth below the surface of approximately 1.5 metres. At 41 bar pressure in the power pack of the rodding unit the cone would not move but when the vibrator was operated it made steady though slow progress. When the power pack was operated at 5_4 bar pressure the cone moved slowly, but use of the vibrator was found to double its speed of progress. This was a very severe test being in solid damp clay. For these conditions larger vibrating forces and larger amplitudes of vibration (in the model used it was about 1.5 mm) would be preferred, provided for example by a Vibtec VE4500.
  • Improved performance may be obtained by the addition of stress-raising shapes to the surface of the cone 1'.
  • One such shape is a knife-edge ridge 16 as shown in Figures 2 and 3.
  • a mole embodying the invention may be used behind another but conventional mole e.g. as a rounding or upgrading mole behind a conventional duct-breaking mole some of which do not leave a circular-section passage behind them.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)
  • Earth Drilling (AREA)
EP85308116A 1984-11-20 1985-11-07 Maulwurf Expired EP0182551B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8429287 1984-11-20
GB848429287A GB8429287D0 (en) 1984-11-20 1984-11-20 Mole

Publications (3)

Publication Number Publication Date
EP0182551A2 true EP0182551A2 (de) 1986-05-28
EP0182551A3 EP0182551A3 (en) 1987-09-30
EP0182551B1 EP0182551B1 (de) 1989-05-31

Family

ID=10569986

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85308116A Expired EP0182551B1 (de) 1984-11-20 1985-11-07 Maulwurf

Country Status (6)

Country Link
EP (1) EP0182551B1 (de)
AU (1) AU4999985A (de)
DE (1) DE3570717D1 (de)
GB (1) GB8429287D0 (de)
NO (1) NO854621L (de)
NZ (1) NZ214234A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0291011A1 (de) * 1987-05-14 1988-11-17 Richard Lee Williams Apparat zum Runden von Kreisquerschnitten
EP0402167A1 (de) * 1989-06-09 1990-12-12 British Gas plc Rohrberster
EP0356666A3 (de) * 1988-09-01 1991-01-30 Schmidt, Paul, Dipl.-Ing. Rammbohrgerät zum grabenlosen Verlegen von Versorgungsleitungen
EP0370183A3 (de) * 1988-11-24 1991-02-06 Schmidt, Paul, Dipl.-Ing. Verfahren zum Verschweissen eines im Erdreich liegenden Rohrstranges mit einem Folgerohr

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4293231A (en) * 1980-01-07 1981-10-06 Lyle John S Bearingless vibrator
EP0053480B2 (de) * 1980-12-02 1992-07-29 British Gas plc Austausch von Rohrleitungen
DE3270340D1 (en) * 1981-01-22 1986-05-15 Hitachi Construction Machinery Pipe embedding method and system
DE3481821D1 (de) * 1983-05-26 1990-05-10 Nippon Telegraph & Telephone Geraet zur schwingungserzeugung.

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0291011A1 (de) * 1987-05-14 1988-11-17 Richard Lee Williams Apparat zum Runden von Kreisquerschnitten
EP0356666A3 (de) * 1988-09-01 1991-01-30 Schmidt, Paul, Dipl.-Ing. Rammbohrgerät zum grabenlosen Verlegen von Versorgungsleitungen
EP0370183A3 (de) * 1988-11-24 1991-02-06 Schmidt, Paul, Dipl.-Ing. Verfahren zum Verschweissen eines im Erdreich liegenden Rohrstranges mit einem Folgerohr
EP0402167A1 (de) * 1989-06-09 1990-12-12 British Gas plc Rohrberster

Also Published As

Publication number Publication date
DE3570717D1 (en) 1989-07-06
NZ214234A (en) 1987-05-29
EP0182551A3 (en) 1987-09-30
EP0182551B1 (de) 1989-05-31
GB8429287D0 (en) 1984-12-27
NO854621L (no) 1986-05-21
AU4999985A (en) 1986-05-29

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