US20140305706A1 - Drilling tool for laying a tube in the ground - Google Patents
Drilling tool for laying a tube in the ground Download PDFInfo
- Publication number
- US20140305706A1 US20140305706A1 US14/236,554 US201214236554A US2014305706A1 US 20140305706 A1 US20140305706 A1 US 20140305706A1 US 201214236554 A US201214236554 A US 201214236554A US 2014305706 A1 US2014305706 A1 US 2014305706A1
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- US
- United States
- Prior art keywords
- tube
- drilling tool
- elongated element
- tool according
- drilling
- 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.)
- Abandoned
Links
- 238000005553 drilling Methods 0.000 title claims abstract description 65
- 239000012530 fluid Substances 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 238000009527 percussion Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 2
- 230000005465 channeling Effects 0.000 claims 1
- 238000001914 filtration Methods 0.000 claims 1
- 238000009412 basement excavation Methods 0.000 description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/06—Down-hole impacting means, e.g. hammers
- E21B4/14—Fluid operated hammers
-
- 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
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/06—Down-hole impacting means, e.g. hammers
-
- 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
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/06—Down-hole impacting means, e.g. hammers
- E21B4/14—Fluid operated hammers
- E21B4/145—Fluid operated hammers of the self propelled-type, e.g. with a reverse mode to retract the device from the hole
-
- 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
- E21B7/04—Directional drilling
- E21B7/046—Directional drilling horizontal drilling
-
- 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
-
- 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
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/06—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for laying cables, e.g. laying apparatus on vehicle
- H02G1/08—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for laying cables, e.g. laying apparatus on vehicle through tubing or conduit, e.g. rod or draw wire for pushing or pulling
Definitions
- the present invention relates to a drilling tool able to drill a passage around a cable or any other buried longilinear element, being guided by said cable or buried longilinear element, said tool pulling a tube behind it.
- recuperation method would consist in digging a trench over the cable to be removed. This method, expensive in itself due to civil engineering costs is highly inappropriate for work in urban areas or when the buried cable is laid next to other cables or pipes or when it crosses a pavement or a railway track.
- Patent No. FR 2.851.317 describes a system whereby a hoist pulls on the cable to be replaced, the end of which is connected to the new cable which is thus pulled in replacement of the old cable. Such a device requires a high power hoist the method being difficult to apply when the diameter of the replacement cable is more important than that of the cable to replace.
- Patent No. FR 2.492.178 describes a tool able to move along a buried cable being activated by hydraulic means, said tool providing a space around the buried cable such as to be able to remove it easily later. A new cable may then be laid in the fitted space.
- Document FR 2.523.170 describes an impact head able to pull a new cable.
- the invention proposes a drilling tool for laying a tube around a buried elongated element, comprising a drilling head guided by the buried element, moving under the action of a pressurized fluid, from a first free end of the buried element towards a second end of the buried element, and pulling the tube, characterized in that the drilling tool comprises pressurization means attached to the first end of the buried element, able to slide into the tube pulled by the drilling head and able to create a pushing force on the drilling head by the pressurization with said pressurized fluid of a pressure chamber arranged between the drilling head and the pressurization means.
- Alternative embodiments are described in the dependent claims.
- the invention improves the laying of the tube around the elongated element by the creation of an additional pushing force with the pressurization of the pressure chamber.
- the drilling head is directly fed with pressurized fluid by the pressure chamber.
- the present invention provides an economic tool, as the drilling head is directly fed with pressurized fluid by the pressure chamber: there are no feeding pipes which follow the drilling head during the widening of the ground around the buried cable or duct. The efficiency of the tool is also increased as there is no friction of such feeding pipes between the installed tube and the buried element.
- FIG. 1 represents a general schematic view of an operation of laying a buried tube using a drilling tool according to the invention
- FIG. 2 represents a partial cross-section view of a drilling head which is part of the drilling tool according to the invention
- FIG. 3 represents a front view of a cap fixed to an end of the cable to remove and part of the drilling tool according to the invention
- FIG. 4 is a cross section view of the cap of the previous fig.
- FIG. 5 represents a front view of a safety disk
- FIG. 6 is a lateral view of the disk of the previous figure.
- FIG. 1 shows a cable 1 to remove, buried in an embankment 10 , surrounded by two excavations 11 and 12 wherein the two ends 13 and 14 of the cable 1 open into.
- a drilling head 2 has been introduced around the end 14 , the rear side 20 of the head 2 being firmly connected to a tube 3 which thus, advances in the advancing movement of the head 2 .
- An external drive 30 for example a caterpillar pushing drive may be provided to facilitate the advance of the tube 3 .
- the drilling head 2 is completed with a cap 4 fixed to the rear end 14 of the cable 1 .
- a pressurized air inlet piping 40 based on a compressor 41 is connected to the cap 4 in order to put under pressure a pressure chamber 42 arranged within the tube 3 , between the cap 4 and the rear side of the tool 2 .
- the device may be completed with a fixing disk 6 firmly fixed near to the end 13 of the cable 1 and able to press against a wall 110 of the excavation 11 in order to prevent any removal movement of the cable 1 .
- the pressure chamber 42 When the pressure chamber 42 is supplied with pressurized air by the piping 40 and through the cap 4 , the latter being sealed, the air pressure rapidly increases within the chamber 42 .
- the latter may be separated into two chambers 420 and 421 by a safety disk 5 , not entirely sealed, the pressure in the two chambers 420 and 421 being equal in normal operating regime.
- This pushing force being equal to the pressure in the chamber 421 multiplied by the section of the crown whereof the external diameter corresponds to the internal diameter of the tube 3 whereas its internal diameter corresponds to the external diameter of the cable 1 .
- This continuous pushing force may reach values of several hundreds of daN, facilitating the progression of the drilling head 2 along the cable 1 .
- the drilling head 2 represented on FIG. 2 is substantially constituted of an impact head of known technique. It comprises two bodies 21 and 22 sliding onto each other by a few millimeters.
- the rear side 20 of the drilling head 2 respectively from the body 22 comprises one or several apertures of nozzles 200 conducting the pressurized air, coming from the chamber 421 , towards a cutterhead chamber 201 provided between the bodies 21 and 22 and containing an oscillating mass 202 .
- This chamber 201 air inlet and outlet pipes are fitted in a known manner in such a way that under the air pressure, the oscillating mass 202 starts oscillating and regularly comes to hit a rear side 210 of the body 21 of the drilling head 2 , in order to make the tool 2 advance in a pulsating manner, according to a known technique of the percussion hammers.
- a spring means 204 is arranged in the rear portion of the cutterhead chamber 201 , such as to receive and damp the shock at the rear of the oscillating mass 202 .
- a filter, represented in 203 prevents dust or debris from penetrating into the piping 200 and blocking the cutterhead chamber 201 .
- This fixing portion comprises a notching or any other means making it possible to ensure a firm hold of the tube 3 .
- a pipe clamp 221 comes to tightly encircle the end of the tube 3 by the outside in order to ensure its hold against the fixing portion 220 .
- a seal, for example an O-ring seal 222 comes to ensure the tightness between the tube 3 and the body 22 , thus creating the pressurizing chamber 421 , thus enabling a continuous additional push such as described previously coming to be added to the penetration force by percussion described above.
- FIGS. 3 and 4 are two representations of the previously mentioned cap 4 .
- the cap 4 is in its normal operating state, the pressurized air inlet piping 40 being connected to a piping fixing represented in 400 .
- a pipe 401 arranged coaxially to the cap 4 and crossing it on either side opens onto apertures 402 supplying the chamber 42 , respectively 420 , with pressurized air.
- a fastener 43 connects a cylindrical portion 430 of the cap 4 to an attaching means 15 fixed to the end of the cable 1 .
- a sealing means 44 for example an O-ring seal, ensures tightness between the chamber 420 and the rear portion of the tube 3 .
- This sealing means 44 is a means allowing for the sliding of the tube 3 around the cap 4 during the pulling of the tube 3 by the drilling head 2 .
- the pressurized air in the chamber represents a very high power.
- the attachment means 43 , 15 break between the cable 1 and the cap 4 , the latter would thus be hurled along the rear end of the tube 3 such a cannonball.
- the staff at work in the excavation 12 may thus be subjected to severe harm.
- the air pressure in the chamber 42 may thus push to the right of the fig., via apertures 431 , a tapered cone crown 432 fixed to said cylindrical portion 430 .
- two brake linings 433 able to be moved radially, are pushed outwards by their tapered contact surfaces and come to brake then block the cap 4 against the internal surface of the tube 3 .
- the pressurized air supply apertures 402 of the chamber 42 close up by sliding the tubular portion 430 , thus cutting the pressurized air supply of this chamber.
- the cap 4 thus substantially serves to create the pressure chamber 42 , this cap 4 being provided with safety means described to prevent any accidents if its attachment means happen to break.
- This means is constituted of a safety disk, represented in 5 on FIG. 1 .
- the safety disk 5 is constituted of two semi-tubular portions 50 and 51 , tightly encircling a portion close to the rear end of the cable 1 and fixed together with screws 52 .
- this disk 5 separates the pressure chamber 42 into two portions 420 and 421 . These portions are not sealingly separated, there are links between these portions on the border of the disk 442 as well as between the two semi-tubular portions 423 .
- the air pressure may easily pass from the chamber 420 to the chamber 421 by links 422 and 423 , whereas in the case of sudden depression in the chamber 420 , the air of the chamber 421 will only escape more slowly.
- the device may be completed with a fixing disk represented in 6 on FIG. 1 .
- It is a disk of external diameter clearly larger than that of cable 1 and fixed firmly on it at its end 13 opening into the excavation 11 .
- the fixing disk 6 thus abuts against the wall 110 , preventing the movement of the cable 1 into the ground.
- the tool has been described to operate with pressurized air, an equivalent tool may also operate with a liquid, for example pressurized water, the skilled person being able to adapt the described elements to such functioning.
- the tool according to the invention has been described as adaptable to the retraction of a cable 1 ; it is obvious that it may easily adapt itself to the retraction of a piping or any other longilinear or elongated element of circular section.
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (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)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
A drilling tool for laying a tube (3) around a buried elongated element (1), comprising a drilling head (2) guided by the buried element (1), moving under the action of a pressurized fluid, from a first free end (14) of the buried element towards a second end (13) of the buried element (1), and pulling the tube (3), characterized in that the drilling tool comprises pressurization means (4) attached to the first end (14) of the buried element (1), able to slide into the tube (3) pulled by the drilling head (2) and able to create a pushing force on the drilling head (2) by the pressurization with said pressurized fluid of a pressure chamber (42) arranged between the drilling head (2) and the pressurization means (4).
Description
- The present invention relates to a drilling tool able to drill a passage around a cable or any other buried longilinear element, being guided by said cable or buried longilinear element, said tool pulling a tube behind it.
- For more than a hundred years many power or telecommunication cables or other piping have been laid in the ground. Many of them are now entirely outdated from a technological standpoint or are of insufficient capacity; they should thus be replaced. Furthermore, it may be of interest to retrieve a cable which has become useless, for recuperating the copper of the conductors as well as for leaving space in the more and more encumbered subsoil.
- The simplest recuperation method would consist in digging a trench over the cable to be removed. This method, expensive in itself due to civil engineering costs is highly inappropriate for work in urban areas or when the buried cable is laid next to other cables or pipes or when it crosses a pavement or a railway track.
- In order to make it possible to remove a cable in such areas, various tools have been proposed. Patent No. FR 2.851.317 describes a system whereby a hoist pulls on the cable to be replaced, the end of which is connected to the new cable which is thus pulled in replacement of the old cable. Such a device requires a high power hoist the method being difficult to apply when the diameter of the replacement cable is more important than that of the cable to replace. Patent No. FR 2.492.178 describes a tool able to move along a buried cable being activated by hydraulic means, said tool providing a space around the buried cable such as to be able to remove it easily later. A new cable may then be laid in the fitted space. Document FR 2.523.170 describes an impact head able to pull a new cable.
- None of the cited documents mentions a tool able to move along a cable laid in the ground and to pull a tube behind it, such as to then be able to easily remove the existent cable then lay the new cable.
- To this end, the invention proposes a drilling tool for laying a tube around a buried elongated element, comprising a drilling head guided by the buried element, moving under the action of a pressurized fluid, from a first free end of the buried element towards a second end of the buried element, and pulling the tube, characterized in that the drilling tool comprises pressurization means attached to the first end of the buried element, able to slide into the tube pulled by the drilling head and able to create a pushing force on the drilling head by the pressurization with said pressurized fluid of a pressure chamber arranged between the drilling head and the pressurization means. Alternative embodiments are described in the dependent claims. The invention improves the laying of the tube around the elongated element by the creation of an additional pushing force with the pressurization of the pressure chamber.
- Advantageously, the drilling head is directly fed with pressurized fluid by the pressure chamber. The present invention provides an economic tool, as the drilling head is directly fed with pressurized fluid by the pressure chamber: there are no feeding pipes which follow the drilling head during the widening of the ground around the buried cable or duct. The efficiency of the tool is also increased as there is no friction of such feeding pipes between the installed tube and the buried element.
- A particular embodiment of a drilling tool according to the invention is more precisely stated in the following description, which is to be considered in connection with the accompanying drawing comprising the figures wherein:
-
FIG. 1 . represents a general schematic view of an operation of laying a buried tube using a drilling tool according to the invention, -
FIG. 2 represents a partial cross-section view of a drilling head which is part of the drilling tool according to the invention, -
FIG. 3 represents a front view of a cap fixed to an end of the cable to remove and part of the drilling tool according to the invention, -
FIG. 4 is a cross section view of the cap of the previous fig., -
FIG. 5 represents a front view of a safety disk, and -
FIG. 6 is a lateral view of the disk of the previous figure. -
FIG. 1 shows acable 1 to remove, buried in anembankment 10, surrounded by twoexcavations cable 1 open into. Through the excavation 12 adrilling head 2 has been introduced around theend 14, therear side 20 of thehead 2 being firmly connected to atube 3 which thus, advances in the advancing movement of thehead 2. Anexternal drive 30, for example a caterpillar pushing drive may be provided to facilitate the advance of thetube 3. Thedrilling head 2 is completed with acap 4 fixed to therear end 14 of thecable 1. A pressurizedair inlet piping 40 based on acompressor 41 is connected to thecap 4 in order to put under pressure apressure chamber 42 arranged within thetube 3, between thecap 4 and the rear side of thetool 2. The device may be completed with afixing disk 6 firmly fixed near to theend 13 of thecable 1 and able to press against awall 110 of theexcavation 11 in order to prevent any removal movement of thecable 1. - When the
pressure chamber 42 is supplied with pressurized air by thepiping 40 and through thecap 4, the latter being sealed, the air pressure rapidly increases within thechamber 42. The latter may be separated into twochambers safety disk 5, not entirely sealed, the pressure in the twochambers - When the
chamber 421 is put under pressure, a pushing force is exerted to the front against therear side 20 of the drilling head. This pushing force being equal to the pressure in thechamber 421 multiplied by the section of the crown whereof the external diameter corresponds to the internal diameter of thetube 3 whereas its internal diameter corresponds to the external diameter of thecable 1. This continuous pushing force may reach values of several hundreds of daN, facilitating the progression of thedrilling head 2 along thecable 1. - The
drilling head 2 represented onFIG. 2 is substantially constituted of an impact head of known technique. It comprises twobodies rear side 20 of thedrilling head 2, respectively from thebody 22 comprises one or several apertures ofnozzles 200 conducting the pressurized air, coming from thechamber 421, towards acutterhead chamber 201 provided between thebodies oscillating mass 202. Thischamber 201 air inlet and outlet pipes are fitted in a known manner in such a way that under the air pressure, the oscillatingmass 202 starts oscillating and regularly comes to hit arear side 210 of thebody 21 of thedrilling head 2, in order to make thetool 2 advance in a pulsating manner, according to a known technique of the percussion hammers. Aspring means 204 is arranged in the rear portion of thecutterhead chamber 201, such as to receive and damp the shock at the rear of the oscillatingmass 202. A filter, represented in 203 prevents dust or debris from penetrating into thepiping 200 and blocking thecutterhead chamber 201. - The new characteristic of this
drilling head 2 is found at the rear of it, where the end of thetube 3 can be seen fixed firmly to afixing portion 220 of thebody 22. This fixing portion comprises a notching or any other means making it possible to ensure a firm hold of thetube 3. Apipe clamp 221 comes to tightly encircle the end of thetube 3 by the outside in order to ensure its hold against thefixing portion 220. A seal, for example an O-ring seal 222 comes to ensure the tightness between thetube 3 and thebody 22, thus creating the pressurizingchamber 421, thus enabling a continuous additional push such as described previously coming to be added to the penetration force by percussion described above. -
FIGS. 3 and 4 are two representations of the previously mentionedcap 4. Such as represented, thecap 4 is in its normal operating state, the pressurizedair inlet piping 40 being connected to a piping fixing represented in 400. Apipe 401 arranged coaxially to thecap 4 and crossing it on either side opens ontoapertures 402 supplying thechamber 42, respectively 420, with pressurized air. Afastener 43 connects acylindrical portion 430 of thecap 4 to an attaching means 15 fixed to the end of thecable 1. A sealing means 44 for example an O-ring seal, ensures tightness between thechamber 420 and the rear portion of thetube 3. This sealing means 44 is a means allowing for the sliding of thetube 3 around thecap 4 during the pulling of thetube 3 by thedrilling head 2. - When the
drilling head 2 has advanced by a few dozen meters along thecable 1, the pressurized air in the chamber represents a very high power. In the case where the attachment means 43, 15 break between thecable 1 and thecap 4, the latter would thus be hurled along the rear end of thetube 3 such a cannonball. The staff at work in theexcavation 12 may thus be subjected to severe harm. - In case of rupture of the attachment means 43, 15 between the
cap 4 and thecable 1, thecylindrical portion 430 is not retained anymore by thecable 1, the air pressure in thechamber 42 may thus push to the right of the fig., viaapertures 431, atapered cone crown 432 fixed to saidcylindrical portion 430. By this axial movement, twobrake linings 433, able to be moved radially, are pushed outwards by their tapered contact surfaces and come to brake then block thecap 4 against the internal surface of thetube 3. Simultaneously, the pressurizedair supply apertures 402 of thechamber 42 close up by sliding thetubular portion 430, thus cutting the pressurized air supply of this chamber. - The
cap 4 thus substantially serves to create thepressure chamber 42, thiscap 4 being provided with safety means described to prevent any accidents if its attachment means happen to break. - An additional means may still be provided in order to prevent the consequences of a malfunctioning of the device. This means is constituted of a safety disk, represented in 5 on
FIG. 1 . As represented onFIGS. 5 and 6 , thesafety disk 5 is constituted of twosemi-tubular portions cable 1 and fixed together withscrews 52. As indicated compared withFIG. 1 , thisdisk 5 separates thepressure chamber 42 into twoportions semi-tubular portions 423. In normal operation, the air pressure may easily pass from thechamber 420 to thechamber 421 bylinks chamber 420, the air of thechamber 421 will only escape more slowly. - The device may be completed with a fixing disk represented in 6 on
FIG. 1 . It is a disk of external diameter clearly larger than that ofcable 1 and fixed firmly on it at itsend 13 opening into theexcavation 11. When thedrilling head 2 reaches the vicinity of theexcavation 11, the remaining portion of thecable 1 between thedrilling head 2 and thewall 110 of theexcavation 11 may be too small to retain thecable 1, the latter thus being able to be swallowed by thedrilling head 2. In order to prevent this, thefixing disk 6 thus abuts against thewall 110, preventing the movement of thecable 1 into the ground. - The above mentioned specification describes a preferred embodiment of a drilling tool according to the invention; it is obvious that various constructive alternatives of one or the other of the described elements may be considered.
- Particularly, the tool has been described to operate with pressurized air, an equivalent tool may also operate with a liquid, for example pressurized water, the skilled person being able to adapt the described elements to such functioning.
- The tool according to the invention has been described as adaptable to the retraction of a
cable 1; it is obvious that it may easily adapt itself to the retraction of a piping or any other longilinear or elongated element of circular section.
Claims (15)
1. A drilling tool for laying a tube around a buried elongated element, comprising
a drilling head guided by the buried element, moving under action of a pressurized fluid, from a first free end of the buried element towards a second end of the buried element, and pulling the tube; and
pressurization means attached to the first end of the buried element, able to slide into the tube pulled by the drilling head and able to create a pushing force on the drilling head by the pressurization with said pressurized fluid of a pressure chamber arranged between the drilling head and the pressurization means.
2. The drilling tool according to claim 1 , wherein the drilling head is directly fed with pressurized fluid by the pressure chamber.
3. The drilling tool according to claim 1 , further comprising:
on a front portion, the drilling head comprising a first impact body sliding over a second concentric body,
an oscillating mass activated by means for supplying and channeling the pressurized fluid regularly coming to hit a rear side of said impact body, said drilling head operating like a percussion hammer, the drilling head being arranged and advancing coaxially to the buried elongated element,
wherein the second concentric body comprises sealing fixing means of said tube, and
wherein the pressurization means are a cap with a cylindrical shape, arranged behind the drilling tool and behind the first free end of the elongated element, within the tube during the pulling, said cap being attached to said free end and being provided with sliding sealing means between its perimeter and the internal surface of the tube, said cap comprising attachment means of a feeding pipe with the pressurized fluid, a feeding pipe feeding with said pressurized fluid inside the pressure chamber arranged in the front portion of the tube, between a rear side of the second body and a front side of said cap, the pressure exerted by said pressurized fluid creating the substantially continuous pushing force against the rear side of the second body contributing to the pushing of said drilling head pulling the tube around the elongated element.
4. The drilling tool according to claim 3 , wherein the sealing fixing means of the tube on the second concentric body comprise a substantially cylindrical portion of the second concentric body with notches as well as an O-ring seal arranged between said second concentric body and the tube.
5. The drilling tool according to claim 4 , wherein the sealing fixing means of the tube on the second concentric body further comprise a pipe clamp arranged on the outside surface of the tube and coming to press said tube against the substantially cylindrical surface of the second concentric body provided with notches.
6. The drilling tool according to claim 3 , further comprising filter means for filtering fluid in the pipes of the fluid system.
7. The drilling tool according to claim 1 , wherein said substantially continuous pushing force applied to the drilling head is substantially equal to the product of the fluid pressure value in the pressure chamber multiplied by the section of the crown whereof the external diameter equals the internal diameter of the tube and the internal diameter equals the external diameter of the elongated element.
8. The drilling tool according to claim 1 , wherein the associated pressurization means comprise a safety means comprising at least two brake linings able, during a rupture of the attachment of the pressurization means to the end of the elongated element, to move radially and to block the pressurization means within the tube, under the action of a conical crown activated by the pressure inside the pressure chamber, a means further being provided to cut the arrival of the pressurized fluid in the pressure chamber.
9. The drilling tool according to claim 1 , further comprising a safety disk comprising two semi-tubular portions tightly encircling a portion close to the first rear end of the elongated element and fixed together by screws, said safety disk separating the pressure chamber into two portions of chambers, a fluid communication of small section being provided in the safety disk and connecting the two portions of chambers.
10. The drilling tool according to claim 1 , wherein the fluid is air.
11. The drilling tool according to claim 1 , wherein the fluid is a liquid.
12. The drilling tool according to claim 1 , further comprising a fixing disk attached to the elongated element close to the second free end of said elongated element, a supporting surface of said disk coming to abut against a wall of backfill in order to prevent a retraction movement of the elongated element.
13. The drilling tool according to claim 1 , wherein the elongated element is an electric power or telecommunications cable.
14. The drilling tool according to claim 1 , wherein the elongated element is a pipe.
15. A method for laying a tube around a buried elongated element comprising:
causing the advance of a drilling head by means of a pressurized fluid, from a first free end of the elongated element;
pulling the tube by the drilling head;
creating a pressure chamber between the drilling head and the first free end of the elongated element; and
applying an additional pushing force on the drilling head by pressurizing the pressure chamber.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH01289/11 | 2011-08-02 | ||
CH12892011 | 2011-08-02 | ||
PCT/EP2012/064869 WO2013017560A2 (en) | 2011-08-02 | 2012-07-30 | Drilling tool for laying a tube in the ground |
Publications (1)
Publication Number | Publication Date |
---|---|
US20140305706A1 true US20140305706A1 (en) | 2014-10-16 |
Family
ID=46640660
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/236,554 Abandoned US20140305706A1 (en) | 2011-08-02 | 2012-07-30 | Drilling tool for laying a tube in the ground |
Country Status (5)
Country | Link |
---|---|
US (1) | US20140305706A1 (en) |
EP (1) | EP2739810A2 (en) |
CN (1) | CN103717823A (en) |
CA (1) | CA2839804A1 (en) |
WO (1) | WO2013017560A2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018104547A1 (en) * | 2016-12-09 | 2018-06-14 | Beermann Bohrtechnik Gmbh | Method and device for trenchless laying of a cable or pipe in the ground |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111101851B (en) * | 2019-12-19 | 2021-08-06 | 国网江苏省电力工程咨询有限公司 | Urban construction cable laying that can carry out degree of depth regulation is with device of punching a hole |
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US5096000A (en) * | 1988-08-04 | 1992-03-17 | Paul Schmidt | Process and apparatus for laying service lines without excavation |
US5639183A (en) * | 1994-11-04 | 1997-06-17 | Koninklijke Ptt Nederland N.V. | Installing cable-ducts |
US6244783B1 (en) * | 1998-04-22 | 2001-06-12 | Tracto-Technik-Paul Schmidt Spezialmaschinen | Widening apparatus |
US20030198518A1 (en) * | 2002-04-15 | 2003-10-23 | Koninklijke Kpn N.V. | Method and apparatus for installing a duct around a longitunal member present at the stretch of installation |
US20040037649A1 (en) * | 2000-12-18 | 2004-02-26 | Van Bijsterveld Cornelis Casparus | Method installing a duct, device for carrying out said method, and a tape-shape element for use with said method |
US20050034899A1 (en) * | 2001-11-14 | 2005-02-17 | Lyon Leland H. | Fluid distributor device for down-hole-drills |
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GB2137719B (en) * | 1983-03-31 | 1987-01-28 | Daly Limited P N | Pipe replacement |
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CN201818240U (en) * | 2009-11-04 | 2011-05-04 | 北京澳尔金石油技术开发有限公司 | Circulation tool for casing running |
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2012
- 2012-07-30 CN CN201280036517.5A patent/CN103717823A/en active Pending
- 2012-07-30 WO PCT/EP2012/064869 patent/WO2013017560A2/en active Application Filing
- 2012-07-30 EP EP12745663.0A patent/EP2739810A2/en not_active Withdrawn
- 2012-07-30 CA CA2839804A patent/CA2839804A1/en not_active Abandoned
- 2012-07-30 US US14/236,554 patent/US20140305706A1/en not_active Abandoned
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US4403667A (en) * | 1981-08-03 | 1983-09-13 | Electric Power Research Institute, Inc. | Cable following apparatus utilizing a releasable cable gripping mechanism |
US4519462A (en) * | 1982-09-02 | 1985-05-28 | Electric Power Research Institute, Inc. | Cable following apparatus having cable cleaning capabilities and method |
US5096000A (en) * | 1988-08-04 | 1992-03-17 | Paul Schmidt | Process and apparatus for laying service lines without excavation |
US5639183A (en) * | 1994-11-04 | 1997-06-17 | Koninklijke Ptt Nederland N.V. | Installing cable-ducts |
US6244783B1 (en) * | 1998-04-22 | 2001-06-12 | Tracto-Technik-Paul Schmidt Spezialmaschinen | Widening apparatus |
US20040037649A1 (en) * | 2000-12-18 | 2004-02-26 | Van Bijsterveld Cornelis Casparus | Method installing a duct, device for carrying out said method, and a tape-shape element for use with said method |
US7018136B2 (en) * | 2000-12-18 | 2006-03-28 | Koninklijke Kpn N.V. | Method installing a duct, device for carrying out said method, and a tape-shape element for use with said method |
US20050034899A1 (en) * | 2001-11-14 | 2005-02-17 | Lyon Leland H. | Fluid distributor device for down-hole-drills |
US20030198518A1 (en) * | 2002-04-15 | 2003-10-23 | Koninklijke Kpn N.V. | Method and apparatus for installing a duct around a longitunal member present at the stretch of installation |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018104547A1 (en) * | 2016-12-09 | 2018-06-14 | Beermann Bohrtechnik Gmbh | Method and device for trenchless laying of a cable or pipe in the ground |
EP3431702A1 (en) * | 2016-12-09 | 2019-01-23 | Beermann Bohrtechnik GmbH | Method and device for trenchless laying of a cable or pipe in the ground |
Also Published As
Publication number | Publication date |
---|---|
CA2839804A1 (en) | 2013-02-07 |
EP2739810A2 (en) | 2014-06-11 |
CN103717823A (en) | 2014-04-09 |
WO2013017560A3 (en) | 2013-11-14 |
WO2013017560A2 (en) | 2013-02-07 |
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Legal Events
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AS | Assignment |
Owner name: EHTP ENTREPRISE HYDRAULIQUE ET TRAVAUX PUBLICS, FR Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:WACINSKI, ANDRZEJ;REEL/FRAME:032776/0566 Effective date: 20140326 Owner name: PLUMETTAZ HOLDING SA, SWITZERLAND Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:WACINSKI, ANDRZEJ;REEL/FRAME:032776/0566 Effective date: 20140326 |
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