EP2942474B1 - Couronne de forage dotée d'un certain nombre de trépans à molettes destinée au forage d'un terrain de fondation et procédé destiné à détacher d'un sabot de cuvelage foré une couronne de forage présentant un certain nombre de trépans à molettes destinée au forage d'un sol de construction - Google Patents

Couronne de forage dotée d'un certain nombre de trépans à molettes destinée au forage d'un terrain de fondation et procédé destiné à détacher d'un sabot de cuvelage foré une couronne de forage présentant un certain nombre de trépans à molettes destinée au forage d'un sol de construction Download PDF

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Publication number
EP2942474B1
EP2942474B1 EP14167345.9A EP14167345A EP2942474B1 EP 2942474 B1 EP2942474 B1 EP 2942474B1 EP 14167345 A EP14167345 A EP 14167345A EP 2942474 B1 EP2942474 B1 EP 2942474B1
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EP
European Patent Office
Prior art keywords
drill head
head ring
drill
unlocking
drill bit
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.)
Not-in-force
Application number
EP14167345.9A
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German (de)
English (en)
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EP2942474A1 (fr
Inventor
Markus Lintschinger
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.)
Zueblin Spezialtiefbau GmbH
Original Assignee
Zueblin Spezialtiefbau GmbH
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.)
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Publication date
Application filed by Zueblin Spezialtiefbau GmbH filed Critical Zueblin Spezialtiefbau GmbH
Priority to EP14167345.9A priority Critical patent/EP2942474B1/fr
Publication of EP2942474A1 publication Critical patent/EP2942474A1/fr
Application granted granted Critical
Publication of EP2942474B1 publication Critical patent/EP2942474B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • E21B10/00—Drill bits
    • E21B10/08—Roller bits
    • E21B10/20—Roller bits characterised by detachable or adjustable parts, e.g. legs or axles
    • 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
    • E21B10/00—Drill bits
    • E21B10/64—Drill bits characterised by the whole or part thereof being insertable into or removable from the borehole without withdrawing the drilling pipe
    • E21B10/66—Drill bits characterised by the whole or part thereof being insertable into or removable from the borehole without withdrawing the drilling pipe the cutting element movable through the drilling pipe and laterally shiftable

Definitions

  • the invention relates to a drill bit with a number of rolling chisels for drilling a subsoil and a method for releasing a drill bit having a number of chisels for drilling a subsoil from a pipe shoe in the sunk state.
  • drill bits are known with a number of rolling chisels for drilling a ground. Such drill bits are each attached to a lower end of a pipe. Such pipes, with which rotary motion and feed are transmitted to the respective drill bit and therefore must be firmly connected to the drill bit, are also referred to as drill pipes or as drill pipes.
  • the pipe shoe is understood below a lower end of a pipe.
  • the pipe shoe is preferably formed as a separate component which can be connected to a conventional round tube, for example by means of screwing.
  • the invention is based on the object to provide an improved drill bit with a number of rolling chisels for drilling a ground and an improved method for releasing a drill bit having a number of rolling chisels for drilling a ground from a pipe shoe.
  • the object is achieved with respect to the drill bit by the combination of features according to claim 1 and with respect to the method by the combination of features according to claim 10.
  • the number of rolling chisels on a drill head ring of the drill bit arranged and it is arranged on the drill head ring means for internally releasing a detachable connection between the drill head ring and a pipe shoe.
  • Internal release is to be understood as meaning a release in which it is not necessary to access the drill bit or the transition region of the tube shoe to the drill bit from the outside.
  • the internal release of the connection between the drill head ring and the pipe shoe makes it possible in a particularly advantageous manner that a dissolved and disassembled individual elements drill bit can be removed through the pipe shoe located in the ground and a very long, also located in the ground pipe, although the outer diameter the drill bit in its undivided composition is significantly larger than the inner diameter of the pipe shoe or pipe.
  • the drill bit according to the invention can be unlocked by means of an unlocking bolt, can be dismantled into connected individual elements and can be removed by means of the unlocking bolt through the pipe shoe.
  • These connected individual elements of the drill bit form in particular the entirety formed by the drill head elements, the drill head ring, locking pin and the retaining sleeve, wherein a drill head element is formed in each case from a roll bit holder, to which a roll chisel is attached and a pull rod, by means of which the roll bit holder on the drill head ring in particular displaceable is attached.
  • the pipe shoe and the unlocking bolt are not part of the drill head ring.
  • the invention makes it possible in a simple manner, a built-in subsoil component, such as a sleeve tube or a icing tube, in the pipe - and thus in the ground - to insert after the drill bit was removed with the chisels through the pipe, the tube but remains in the ground with the pipe shoe.
  • a built-in subsoil component such as a sleeve tube or a icing tube
  • the particular advantage is that the drill bit according to the invention, a technically demanding and expensive construction, after use very easy to remove and thus reusable.
  • a preferred embodiment of the invention provides that the drill head ring is designed such that in the same unlocking bolt is inserted, with which the means for releasing is triggered.
  • the drill head ring is preferably sleeve-shaped.
  • the drill head ring is cylindrical and can be arranged centrally in the pipe shoe.
  • the unlocking bolt is attached as a head construction on a component to be inserted into the tube, in particular on a linkage.
  • the release bolt reaches the drill bit and inserted into its drill collar is automatically locked the unlocking bolt with the drill head ring and it is also automatically the drill bit separated from the pipe, so triggered the means for loosening.
  • the drill bit can be pulled out of the ground by means of the unlocking bolt without the pipe while the pipe remains in the ground.
  • at least the drill bit can be reused, resulting in great economic benefits, especially in expensive drill bits.
  • the invention provides that a number of drill head elements are arranged on the drill head ring, each drill head element each comprising a roller bit holder, wherein a roller bit is arranged on each roller bit holder. This succeeds in a simple manner the formation of a drill bit, which can be unlocked, disassembled into connected individual elements and can be removed by means of an unlocking bolt through the pipe shoe. Particularly preferred three drill head elements are arranged on the drill head ring.
  • the invention further provides that in the transverse direction, the largest dimension of a drill head element is smaller than the outer diameter of the drill head ring.
  • the drill head ring and each of the drill head elements can be removed through the pipe shoe, with the pipe and the pipe shoe remaining in the ground.
  • the outer diameter of the totality of the locked drill head elements is greater than the outer diameter of the pipe shoe, whereby a particularly effective bore is made possible because the friction of the pipe shoe and the pipe in the ground is very low.
  • very deep holes are to be accomplished, according to the invention still the drill bit after Festig ein the hole from the ground can be removed, with tube shoe and tube can remain in the ground.
  • each roller chisel holder axially displaceable in each case by means of a pull rod, in particular with a stop, on Drill head ring is attached.
  • different tie rods have different lengths, so that in the unlocked state of the drill head ring of the drill head ring and in particular a plurality of drill head elements, in particular three drill head elements are successively removed through the pipe shoe. It is particularly advantageous that for this purpose only a single tool, namely the unlocking bolt, is required. Characterized in that different tie rods have different lengths, it is possible that the removal of the unlocked roller chisel holder automatically takes place successively. Particularly preferably, the difference in the lengths of two tie rods is approximately equal to the length of a roll chisel holder.
  • a further embodiment of the invention provides that the means for releasing the detachable connection between the drill head ring and the pipe shoe comprises a number of radially displaceable locking bolts.
  • a locking bolt is displaceable from a locking first position to an unlocking second position.
  • the locking bolts can be pulled out of corresponding recesses of the pipe shoe.
  • the release of the drill bit from the pipe shoe is therefore particularly easy.
  • a secure connection between pipe shoe and drill bit in the locking position is possible.
  • the number of locking bolts is preferably designed in such a way that, in its locking first position, it projects at least partially radially relative to an outer wall of a drill head collar and does not protrude radially in its unlocking second position relative to the outer wall of the drill head collar.
  • the inner diameter of the pipe shoe is slightly larger than the outer diameter of the corresponding drill head ring. A positive and very viable connection between pipe shoe and drill bit in the locking position is therefore particularly easy.
  • a particularly preferred embodiment of the invention provides that the means for releasing the releasable connection between the drill head ring and the pipe shoe comprises a release sleeve causing the holding sleeve, which is arranged in the drill head ring.
  • the retaining sleeve is preferably axially displaceable for triggering the unlocking between the locking first position and the unlocking second position.
  • Another preferred embodiment of the invention provides that the number of radially displaceable locking bolts is biased by spring force such that it is displaceable upon release from a locking first position to an unlocking second position.
  • the locking bolt is preferably biased by a coil spring, whereby the invention is easy to preload and compact buildable.
  • Another preferred embodiment of the invention provides that in a lower base of the drill head ring a number of horizontal bores is arranged, wherein in a horizontal bore a fixing ball is arranged, which is fixable in locking position by means of the holding sleeve in the inside ball recesses of the roller bit holder and in unlocking position can be brought by means of the inner wall of the roller bit holder in an outside recess of the retaining sleeve.
  • the tube bit holders are particularly preferably arranged alternately with fixing strips of the drill head ring, so that in the locked state the tube bit holders together with the fixing strips form a sleeve, which is located between drill head ring and tube shoe can be fixed.
  • very high torques can be transmitted from the pipe via the pipe shoe to the drill bit in the locked state.
  • the drill head ring is provided with a cone for simplified insertion of the release bolt.
  • the introduction of the unlocking bolt is simplified because the unlocking bolt is automatically centered.
  • the head of the unlocking bolt itself has a conical shape and / or a fillet, whereby not only the introduction of the unlocking bolt into the drill head ring, but also the axial passage of the unlocking bolt through the pipe is particularly simplified.
  • the outer wall of the roll chisel holder is designed to be conical, that the outer diameter is larger down, while the corresponding inner wall of the pipe collar of the pipe shoe is formed conically, that the inner diameter of the pipe collar also increases downwards , As a result, the roll chisel holder are wedged firmly in the assembled, locked state between drill head ring and pipe rim.
  • the method according to the invention for releasing a drill bit having a number of roller bits for drilling a ground from a pipe shoe in a sunk state is particularly suitable for releasing a drill bit according to the invention from a pipe shoe.
  • a connection between a drill head ring of the drill bit and the pipe shoe is solved internally by a releasing the drill bit triggering unlocking bolt is inserted into the drill head ring. It must not be accessed from the outside on the drill bit or on the transition region of the pipe shoe to the drill bit, whereby the drill bit after completion of the hole in connected individual elements can be dismantled and by means of Entriegelungsbolts through the pipe shoe and the pipe through in its installed state is removable.
  • the drill bit can be removed without having to pull the pipe from the ground. This allows a particularly effective bore, because the friction of the pipe shoe and the pipe in the ground is very low, which are very deep holes to accomplish. Due to the fact that the drill bit is removed from the ground after the hole has been fixed, while the pipe shoe and pipe can remain in the ground, the drill bit is available for further use.
  • the method according to the invention provides that, by inserting the unlocking bolt into the drill head collar, first a retaining sleeve arranged therein is displaced axially from a locking first position into an unlocking second position to trigger the unlocking, whereby the drill head collar is automatically unlocked from the pipe shoe.
  • the unlocking bolt is locked to the drill head ring and then the drill head ring and successively the attached chisel are removed by means of corresponding tie rods of different lengths through the pipe shoe. It is particularly advantageous that for this purpose only a single tool, namely the unlocking bolt, is required. By using tie rods of different lengths, it is possible for the removal of the unlocked roll bit holders to be carried out automatically in succession.
  • An embodiment of the method according to the invention provides that a number of radially displaceable and prestressed locking bolts are unlocked by the axial displacement of the retaining sleeve from the locking first position to the unlocking second position, whereby the locking bolt from a locking first position into an unlocking second Move position, wherein in the unlocking second position of the drill head ring is unlocked from the pipe shoe and the Unlocking bolt is locked to the drill head ring by means of the locking bolt.
  • a further preferred embodiment of the method according to the invention provides that an unlocking bolt is used, which has a collar whose outer diameter is greater than the inner diameter of the retaining sleeve and whose inner diameter is smaller than the inner diameter of the retaining sleeve and that by inserting the unlocking bolt in the drill head ring the retaining sleeve arranged therein is displaced axially from the locking first position into the unlocking second position for triggering the unlocking.
  • Another preferred embodiment of the invention provides that the number of locking bolts in its locking first position with respect to an outer wall of a drill collar at least partially survive radially and not radially project in its unlocking second position relative to the outer wall of the drill collar.
  • the inner diameter of the pipe shoe is slightly larger than the outer diameter of the corresponding drill head ring. A positive and very viable connection between the pipe and drill bit in the locking position is therefore particularly easy.
  • FIG. 1 shows a longitudinal section of a drill bit 1 according to the invention, which is to be used for producing a vertical wellbore in a subsoil, not shown.
  • a tubular shoe 2 with a thread 2.1 for connection to a pipe (not shown) and an unlocking bolt 5 are shown in longitudinal section.
  • the pipe shoe 2 is a lower end of a pipe, the other elements are not shown.
  • the drill bit 1 comprises a first drill head element 1.1, a second drill head element 1.2, a third drill head element 1.3, a drill head ring 1.4, locking bolt 3 and a holding sleeve 4.
  • the tube shoe 2 and the unlocking bolt 5 are not elements of the drill bit 1.
  • the drill head elements 1.1, 1.2, 1.3 are releasably secured to the drill head ring 1.4 and are in a locked state.
  • the drill head ring 1.4 is releasably secured in the pipe shoe 2 and is also in a locked state. In this locked state, the drill head elements 1.1, 1.2, 1.3 rotatably connected to the pipe shoe 2.
  • the first drill head element 1.1 comprises a first roller chisel 1.1.1, a first roller chisel holder 1.1.2, in which a first ball groove 1.1.2.1 is arranged, and a first pull rod 1.1.3, not shown here.
  • the second drill head element 1.2 comprises a second roller chisel 1.2.1, a second roller chisel holder 1.2.2, in which a second ball recess 1.2.2.1, not shown here, is arranged, and a second pull rod 1.2.3.
  • the third drill head element 1.3 comprises a third roller chisel 1.3.1 (not shown here), a third roller chisel holder 1.3.2, not shown here, in which a third ball depression 1.3.2.1, not shown here, is arranged, and a third pull rod 1.3, not shown here. third
  • the roller chisel 1.1.1, 1.2.1, 1.3.1 rotatably connected to the pipe shoe 2, so that the pipe shoe 2 as a conventionally equipped with roller chisel pipe for drilling a particular rocky ground in a conventional manner usable is.
  • the drill head ring 1.4 and each of the drill head elements 1.1, 1.2, 1.3 can be removed through the pipe shoe (2), since in the transverse direction the largest dimension of a drill head element 1.1, 1.2, 1.3 is smaller than the outer diameter of the drill head ring 1.4, which in turn is slightly smaller is as the inner diameter of the pipe shoe. 2
  • Each roller chisel holder 1.1.2, 1.2.2, 1.3.2 is in each case by means of a Pull rod 1.1.3, 1.2.3, 1.3.3 axially slidably mounted on the drill head ring 1.4.
  • Different drawbars 1.1.3, 1.2.3, 1.3.3 have different lengths, so that in the unlocked state of the drill head ring 1.4, first the drill head ring 1.4 and then the drill head elements 1.1, 1.2, 1.3 successively, but contiguously, through the pipe shoe 2 removed are.
  • Each pull rod 1.1.3, 1.2.3, 1.3.3 is connected with its lower end fixed to the corresponding roller chisel holder 1.1.2, 1.2.2, 1.3.2.
  • Each pull rod 1.1.3, 1.2.3, 1.3.3 is guided in each case by a vertical bore 1.4.4, in which case only a vertical bore 1.4.4 is shown.
  • the upper end of each tie rod 1.1.3, 1.2.3, 1.3.3 has a thickening, whose outer diameter is greater than the inner diameter of the vertical bore 1.4.4, so that a displaceability of a roll chisel holder 1.1.2, 1.2.2, 1.3. 2 with respect to the drill head ring 1.4 by the length of the respective tie rod 1.1.3, 1.2.3, 1.3.3 is determined and limited.
  • the number of radially displaceable locking bolts 3 form a means for releasing the detachable connection between the drill head ring 1.4 and the pipe shoe 2.
  • the locking bolts 3 are displaceable from a locking first position shown here in an unlocking second position, not shown in this figure.
  • the locking bolts 3 are at least partially radially over in their locking first position relative to a cylindrical outer wall of the drill head ring 1.4; in their unlocking second position they are not radially over against the outer wall of the drill head ring 1.4.
  • the illustration shows only one of the locking bolt 3, which are each mounted radially displaceable and each by means of a fixing plate 3.3 in the drill head ring 1.4.
  • the fixing plates 3.3 are not opposite to the outer wall of the drill head ring 1.4 to the outside.
  • the locking bolts 3 are here in their locking first position, in which they protrude over the outer wall of Bohrkopfkranzes 1.4 partially radially and engage in the corresponding inside recesses 2.2.2 of the pipe collar 2.2 of the pipe shoe 2, so that this particular in the axial direction relative to the Drill head ring 1.4 and thus fixed relative to the drill bit 1.
  • Each locking bolt 3 is fixedly connected to a base plate 3.1, which is acted upon by means of a prestressed coil spring 3.2 with an inwardly, radially on an outer wall of a retaining sleeve 4, directed pressure force.
  • the holding sleeve 4 has an outer diameter which is slightly smaller than the inner diameter of the drill head ring 1.4.
  • the substantially hollow cylindrical drill head ring 1.4 is provided with three continuous horizontal holes 1.4.1, one of which is shown.
  • the horizontal bores 1.4.1 are in a hollow cylindrical Base 1.4.2 below the arrangement of the locking bolt 3 in the lower region of the drill head ring 1.4.
  • a fixing ball 1.4.5 is arranged, whose diameter is greater than the wall of the base 1.4.2.
  • the illustrated fixing ball 1.4.5 lies in the locking state on the inside on the outer wall of the holding sleeve 4 and protrudes externally into a corresponding first ball recess 1.1.2.1 of the first roller chisel holder 1.1.2, that the first roller chisel holder 1.1.2 in the locking state between the Pipe wreath 2.2 of the pipe shoe 2 and the base 1.4.2 of the drill head ring 1.4 is positively fixed, since the drill head ring 1.4 is locked in the locking state itself by means of the locking bolt 3 with the pipe shoe 2.
  • a recess 4.1 is arranged, which is designed as a circumferential groove such that when moving the retaining sleeve 4 down the fixing balls 1.4.5 inside, ie in the recess 4.1 inside, are displaceable.
  • the positive connection between base 1.4.2 and the roller chisel holders 1.1.2, 1.2.2, 1.3.2 is achieved.
  • the retaining sleeve 4 is secured against unintentional displacement; Optionally, this backup is done by clamping in the drill head ring 1.4.
  • the base 1.4.2 is conically tapered downwardly on the outside, while the roller chisel holder 1.1.2, 1.2.2, 1.3.2 have a corresponding shape such that their inner radius also decreases downwards. This ensures that after unlocking the drill head ring 1.4 can be easily pulled up, while - at least at the beginning of removal - the roller chisel holder 1.1.2, 1.2.2, 1.3.2 remain in their position shown here or at most slightly axially after move inside.
  • the tube ring 2.2 has a conical lower tube edge 2.2.1, the shape of which corresponds to outer edges of the roller bit holder 1.1.2, 1.2.2, 1.3.2, so that when removing one of the roller bit holder 1.1.2, 1.2.2, 1.3. 2 upwards automatically threading in the direction of the center of the pipe shoe 2 takes place.
  • the top of the FIG. 1 Unlocking bolt 5 shown has in its area shown below a collar 5.1 whose outer diameter is greater than that of the cylindrical base body of the unlocking pin 5.
  • the outer diameter of the collar 5.1 is smaller than the inner diameter of the drill head ring 1.4 and larger than the inner diameter of the retaining sleeve 4th Am front, ie lower portion of the release bolt 5 is a valve ball 5.2 clamped by means of a valve spring 5.3 against a bolted to the unlocking bolt 5 head 5.4, so that a Non-return valve is formed, through which a fluid under sufficient pressure can be flowed out of the head 5.4, wherein an influx of a fluid through the head 5.4 in the unlocking pin 5 is prevented, however.
  • a bottom 1.4.3 of the drill head ring 1.4 is provided with a bore.
  • the unlocking pin 5 has at its end shown above an internal thread, with which it can be connected to another component, in particular with a linkage for insertion or with a sleeve tube or an icing, so that the unlocking pin 5 with valve ball 5.2, valve spring 5.3 and head 5.4 can form a lance head for the sleeve tube or the icing tube.
  • the unlocking bolt 5 serves to trigger the unlocking of the drill head 1 from the pipe shoe 2 and enter into a locking with the drill head ring 1.4, so that the unlocked from the pipe shoe 2 drill head 1 can be removed through the pipe shoe 2, when the hole is completed in the ground.
  • the pipe shoe 2 itself remains in the ground.
  • FIG. 2 shows a section of a schematic perspective view of an embodiment of a drill head ring 1.4 with three bars 1.4.7, of which two bars 1.4.7 are visible here.
  • the strips are axially arranged outside of the base 1.4.2 and serve to fix the roller bit holder 1.1.1, 1.2.1, 1.3.1, not shown here, wherein in each case one of the roller bit holder 1.1.1, 1.2.1, 1.3.1 so between two bars 1.4.7 can be arranged that in the locked state, the three substantially cup-shaped roller chisel holder 1.1.1, 1.2.1, 1.3.1 together with the three bars 1.4.7 form a sleeve-like structure.
  • each of the roller chisel holder 1.1.1, 1.2.1, 1.3.1 locked state by means of two fixing balls 1.4.5 locked.
  • the second pull rod 1.2.3 hangs in one of the vertical bores 1.4.4., Which is formed in the region of the base 1.4.2 as a slot.
  • FIG. 3 shows a greatly simplified schematic bottom view for the locked state of the mounted drill bit 1 with the drill head elements 1.1, 1.2, 1.3, each of the rolling chisels 1.1.1, 1.2.1, 1.3.1, the roll chisel holders 1.1.2, 1.2.2, 1.3.2 and the tie rods 1.1.3, 1.2.3, 1.3.3 are formed.
  • the tube ring 2.2 Above the drill head elements 1.1, 1.2, 1.3, the tube ring 2.2 is shown, whose outer diameter is significantly smaller than the outer diameter of the group of roller chisel 1.1.1, 1.2.1, 1.3.1, whereby a hole can be made, in which a very low skin friction occurs.
  • FIG. 4 shows a longitudinal section of the above-described drill bit 1 according to the invention in the unlocked state. Apart from the drill bit 1, the tube shoe 2 and the unlocking bolt 5 are shown, which is locked to the drill head ring 1.4.
  • the tube 2 connected to the pipe is not shown.
  • the retaining sleeve 4 is moved by means of the unlocking pin 5 in the drill head ring 1.4 axially downwards, whereby the locking pin 3 and the foot plates 3.1 are pressed radially inward.
  • the unlocking bolt 5 is locked to the drill head ring 1.4 and on the other hand the drill head ring 1.4 is unlocked from the pipe shoe 2.
  • the drill head ring 1.4 forms individual elements connected to the drill head elements 1.1, 1.2, 1.3 in the released state shown.
  • the unlocked drill bit 1 by means of Entriegelungsbolzens 5, the adjoining linkage is not shown, through the pipe shoe 2 through, namely first the drill head ring 1.4, then the first drill head element 1.1, the first drawbar 1.1.3 the shortest of the tie rods 1.1. 3, 1.2.3, 1.3.3, then the second drill head element 1.2, the second drawbar 1.2.3 is the second longest of the tie rods 1.1.3, 1.2.3, 1.3.3 and then the third drill head element 1.3, not shown here, the third pull rod 1.3.3 is the longest of the pull rods 1.1.3, 1.2.3, 1.3.3.

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  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)

Claims (11)

  1. Couronne de forage (1) comprenant une pluralité de trépans à molette (1.1.1, 1.2.1, 1.3.1) pour forer un sol de construction, la pluralité de trépans à molette (1.1.1, 1.2.1, 1.3.1) étant disposée sur une couronne de tête de forage (1.4) de la couronne de forage (1) et un moyen pour desserrer intérieurement une connexion de serrage entre la couronne de tête de forage (1.4) et un sabot de tubage (2) étant disposé sur la couronne de tête de forage (1.4) et la couronne de forage (1), dans l'état desserré, pouvant être séparée en éléments individuels assemblés,
    caractérisée en ce qu'une pluralité d'éléments de tête de forage (1.1, 1.2, 1.3) est disposée sur la couronne de tête de forage (1.4), chaque élément de tête de forage (1.1, 1.2, 1.3) comprenant à chaque fois un support de trépan à molette (1.1.2, 1.2.2, 1.3.2), un trépan à molette (1.1.1, 1.2.1, 1.3.1) est à chaque fois disposé sur chaque support de trépan à molette (1.1.2, 1.2.2, 1.3.2), la plus grande dimension d'un élément de tête de forage (1.1, 1.2, 1.3) dans la direction transversale étant inférieure au diamètre extérieur de la couronne de tête de forage (1.4), de telle sorte que dans l'état déverrouillé, la couronne de tête de forage (1.4) et chacun des éléments de tête de forage (1.1, 1.2, 1.3) peuvent être enlevés à travers le sabot de tubage (2), et chaque support de trépan à molette (1.1.2, 1.2.2, 1.3.2) étant à chaque fois fixé au moyen d'une barre de traction (1.1.3, 1.2.3, 1.3.3) de manière déplaçable axialement sur la couronne de tête de forage (1.4), différentes barres de traction (1.1.3, 1.2.3, 1.3.3) présentant différentes longueurs de telle sorte que dans l'état déverrouillé de la couronne de tête de forage (1.4), la couronne de tête forage (1.4) et les éléments de tête de forage (1.1, 1.2, 1.3) puissent être enlevés les uns après les autres à travers le sabot de tubage (2).
  2. Couronne de forage (1) selon la revendication 1, caractérisée en ce que la couronne de tête de forage (1.4) est réalisée de telle sorte qu'un boulon de déverrouillage (5) puisse être introduit dans celle-ci pour déclencher les moyens de desserrage.
  3. Couronne de forage (1) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que le moyen pour desserrer la connexion de serrage entre la couronne de tête de forage (1.4) et le sabot de tubage (2) comprend une pluralité de boulons de verrouillage (3) déplaçables radialement qui peut être déplacée depuis une première position de verrouillage dans une deuxième position de déverrouillage.
  4. Couronne de forage (1) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que la pluralité de boulons de verrouillage (3) dans sa première position de verrouillage dépasse au moins en partie radialement par rapport à une paroi extérieure d'une couronne de tête de forage (1.4) et dans sa deuxième position de déverrouillage ne dépasse pas radialement par rapport à la paroi extérieure de la couronne de tête de forage (1.4).
  5. Couronne de forage (1) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que le moyen pour desserrer la connexion de serrage entre la couronne de tête de forage (1.4) et le sabot de tubage (2) comprend une douille de retenue (4) provoquant le déclenchement du déverrouillage, laquelle est disposée dans la couronne de tête de forage (1.4).
  6. Couronne de forage (1) selon la revendication précédente,
    caractérisée en ce que la douille de retenue (4) est déplaçable axialement entre la première position de verrouillage et la deuxième position de déverrouillage pour déclencher le déverrouillage.
  7. Couronne de forage (1) selon l'une quelconque des revendications 3 à 6,
    caractérisée en ce que la pluralité de boulons de verrouillage déplaçables radialement (3) est précontrainte par une force de ressort de telle sorte qu'elle puisse être déplacée lors du déclenchement d'une première position de verrouillage dans une deuxième position de déverrouillage.
  8. Couronne de forage (1) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que dans un socle inférieur (1.4.2) de la couronne de tête de forage (1.4) est disposée une pluralité d'alésages horizontaux (1.4.1), une bille de fixation (1.4.5) étant disposée dans un alésage horizontal (1.4.1), laquelle peut être fixée dans la position de verrouillage au moyen de la douille de retenue (4) dans des cavités de bille du côté intérieur (1.1.2.1, 1.2.2.1, 1.3.2.1) des supports de trépan à molette (1.1.2, 1.2.2, 1.3.2) et peut être amenée, dans une position de déverrouillage, au moyen de la paroi intérieure du support de trépan à molette (1.1.2, 1.2.2, 1.3.2) dans un évidement du côté extérieur (4.1) de la douille de retenue (4).
  9. Couronne de forage (1) selon l'une quelconque des revendications 1 à 6,
    caractérisée en ce que la couronne de tête de forage (1.4) est pourvue d'un cône (1.4.6) pour faciliter l'introduction du boulon de déverrouillage (5).
  10. Procédé pour desserrer une couronne de forage (1) présentant une pluralité de trépans à molette (1.1.1, 1.2.1, 1.3.1) pour le forage d'un sol de construction, d'un sabot de tubage (2) à l'état foré, en particulier pour desserrer une couronne de forage (1) selon l'une quelconque des revendications précédentes d'un sabot de tubage (2), une connexion entre une couronne de tête de forage (1.4) de la couronne de forage (1) et le sabot de tubage (2) étant desserrée à l'intérieur en introduisant un boulon de déverrouillage (5) déclenchant le desserrage de la couronne de forage (1) dans la couronne de tête de forage (1.4),
    par l'introduction du boulon de déverrouillage (5) dans la couronne de tête de forage (1.4), tout d'abord une douille de retenue (4) disposée dans celle-ci pour déclencher le déverrouillage étant déplacée axialement depuis une première position de verrouillage dans une deuxième position de déverrouillage de sorte que la couronne de tête de forage (1.4) soit automatiquement déverrouillée du sabot de tubage (2), le boulon de déverrouillage (5) étant verrouillé avec la couronne de tête de forage (1.4) et ensuite la couronne de tête de forage (1.4), l'un après l'autre, les trépans à molette (1.1.1, 1.2.1, 1.3.1) fixés à celle-ci sont enlevés au moyen de barres de traction correspondantes (1.1.3, 1.2.3, 1.3.3) de différentes longueurs à travers le sabot de tubage (2).
  11. Procédé selon la revendication 10,
    caractérisé en ce que par le déplacement axial de la douille de retenue (4) de la première position de verrouillage dans la deuxième position de déverrouillage, une pluralité de boulons de verrouillage (3) déplaçables radialement et soumis à une précontrainte sont déverrouillés de sorte que les boulons de verrouillage (3) se déplacent de la première position de verrouillage dans une deuxième position de déverrouillage, dans la deuxième position de déverrouillage, la couronne de tête de forage (1.4) étant déverrouillée du sabot de tubage (2) et le boulon de déverrouillage (5) étant verrouillé au moyen du boulon de verrouillage (3) avec la couronne de tête de forage (1.4).
EP14167345.9A 2014-05-07 2014-05-07 Couronne de forage dotée d'un certain nombre de trépans à molettes destinée au forage d'un terrain de fondation et procédé destiné à détacher d'un sabot de cuvelage foré une couronne de forage présentant un certain nombre de trépans à molettes destinée au forage d'un sol de construction Not-in-force EP2942474B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14167345.9A EP2942474B1 (fr) 2014-05-07 2014-05-07 Couronne de forage dotée d'un certain nombre de trépans à molettes destinée au forage d'un terrain de fondation et procédé destiné à détacher d'un sabot de cuvelage foré une couronne de forage présentant un certain nombre de trépans à molettes destinée au forage d'un sol de construction

Applications Claiming Priority (1)

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EP14167345.9A EP2942474B1 (fr) 2014-05-07 2014-05-07 Couronne de forage dotée d'un certain nombre de trépans à molettes destinée au forage d'un terrain de fondation et procédé destiné à détacher d'un sabot de cuvelage foré une couronne de forage présentant un certain nombre de trépans à molettes destinée au forage d'un sol de construction

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CN112160721A (zh) * 2020-10-19 2021-01-01 高俊亭 一种可拆换近钻头地质导向钻进结构
US12006772B1 (en) 2023-03-17 2024-06-11 Saudi Arabian Oil Company Method and apparatus of drill bit adjustable gauge system

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US2763469A (en) * 1952-01-01 1956-09-18 Cementation Co Ltd Rotary rock drills
US3216514A (en) * 1962-02-23 1965-11-09 Nelson Norman A Rotary drilling apparatus
US3169592A (en) * 1962-10-22 1965-02-16 Lamphere Jean K Retrievable drill bit
US3880247A (en) * 1972-08-23 1975-04-29 Thomas J Harding Replaceable drill bit for rotary drilling of bore holes
GB2108552B (en) * 1981-09-17 1985-01-23 Sumitomo Metal Mining Co Earth boring apparatus

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