Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23B—TURNING; BORING
  • B23B49/00—Measuring or gauging equipment on boring machines for positioning or guiding the drill; Devices for indicating failure of drills during boring; Centering devices for holes to be bored
  • B23B49/02—Boring templates or bushings
  • B23B49/026—Boring bushing carriers attached to the workpiece by glue, magnets, suction devices or the like
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23B—TURNING; BORING
  • B23B49/00—Measuring or gauging equipment on boring machines for positioning or guiding the drill; Devices for indicating failure of drills during boring; Centering devices for holes to be bored
  • B23B49/003—Stops attached to drilling tools, tool holders or drilling machines
  • B23B49/005—Attached to the drill
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23B—TURNING; BORING
  • B23B2260/00—Details of constructional elements
  • B23B2260/026—Bushings, e.g. adapter sleeves
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23B—TURNING; BORING
  • B23B2260/00—Details of constructional elements
  • B23B2260/118—Suction pads or vacuum cups, e.g. for attachment of guides to workpieces

Definitions

• the invention relates, in its broadest sense, to the drilling of concrete structures or the like, and more particularly to the field of storage tanks for liquefied gas, liquid natural gas or others, in particular storage tanks for terrestrial liquid natural gas, designated by the term GST for “Ground Storage Tank”, and natural gas storage tanks buried at sea, designated by the term GBS for “Gravity Based Support”.
• Liquid natural gas is generally transported by sea in storage tanks provided on transport ships. Natural gas is kept in liquid form to increase the amount of natural gas transported per tank, the volume of one liter of natural gas in liquid form being much lower than the volume of one liter of natural gas in gaseous form. These tanks maintain the liquid natural gas at a very low temperature, and more precisely at a temperature below -163°C, the temperature at which the natural gas is in liquid form at atmospheric pressure.
• a GST terrestrial storage tank for liquid natural gas is conventionally installed at a port.
• the latter is generally fitted out so that liquid natural gas transport ships can come and restock and/or unload their liquid natural gas cargo.
• Such onshore storage tanks are equipped with elements passing through one of the walls of these onshore tanks, such as for example a tube, then allowing a liquid natural gas loading and/or unloading installation to communicate with an internal volume of the onshore tank in which the liquid natural gas is stored.
• Such storage tanks require an internal installation allowing the cryogenic liquid to be kept essentially in liquid form, so the installation must be perfectly sealed and thermally insulating.
• Such installations internal to a storage tank to form a tank of the GST type are known, in particular from the applicant's publications.
• these GST or GBS tanks have concrete walls which are very hard or resistant in which it is necessary to be able to drill holes of a certain depth in order to anchor therein, via studs in particular, the watertight and thermally insulating installation as such.
• the vapor barrier layer is conventionally present on the internal walls of such a tank to protect the concrete from contact with water and to ensure a good bond with the mastic necessary to set waterproof and thermally insulating installation on concrete walls.
• the installation of the insulation system must ensure tightness: on the one hand to the dinitrogen (N 2 ) contained in the insulation space and on the other hand to the external atmosphere and to avoid the migration oxygen to the isolation space
• the applicant has developed a drilling device capable of drilling a hard or very hard wall, such as concrete or the like, to a relatively large depth without any deviation of the drill fitted with its drill head so that the hole made is perfectly orthogonal to the wall, over its entire depth.
• the drill bit and its drill head undergo no vibration, or almost no vibration, nor any buckling during drilling.
• the present invention relates to a device for drilling a wall, comprising a main body housing at least one drill, metal or metal alloy, comprising at one end of a drill head capable of drilling a wall, the device having an energy source and/or being capable of being connected to an energy supply source.
• the invention is characterized in that the drilling device further comprises:
• a drill bush in which the coating sleeve slides over at least a length L when drilling the wall, said drill bush and the coating sleeve are mounted in sliding fit H7g6 as defined according to ISO 8015 , and the drill bushing and the coating sleeve have between them a coefficient of friction at most equal to 0.2 according to the ASTM G77 standard.
• the guide distance L of the coating sleeve in the drill bush is at least equal to two point five times the diameter of the coating sleeve, i.e. L>2.5 D.
• the applicant has developed, after multiple tests and analyses, a drilling device requiring no additional/supplementary part, all the elements necessary to make perfectly orthogonal drillings, over the entire depth of each drilling, being included in the drilling device.
• a single operator thus has all the necessary functional elements and can manipulate the drilling device according to the invention, it being considered that such a device weighs only a few kilos.
• the holes conventionally required in the walls of a GST or GBS tank are at least 40 millimeters (mm), generally of the order of 50 mm, to drive in dowels or the like. .
• the drilling device according to the invention is an anti-vibration, anti-overhang or even anti-buckling device for the drill bit and its drill head.
• the terms “external” and “internal” are used to define the relative position of one element with respect to another, with reference to the inside and the outside of the tank.
• the drill when the drilling device is placed against a wall, has two ends, one outer carrying the drill head and the other inner carrying a stop collar, as will be specified below.
• the cylindrical coating sleeve is made of a metallic material or a metal alloy, preferably the cylindrical coating sleeve is made of bronze.
• the drill bit is advantageously made of an iron-based alloy of the type comprising, by weight, 0% ⁇ C ⁇ 0.21%, 0% ⁇ Mn ⁇ 1%, 0% ⁇ Si ⁇ 0 .5%, 0% ⁇ P ⁇ 0.035% and 0% ⁇ S ⁇ 0.035%, the remainder being iron and impurities necessarily resulting from the elaboration.
• the coating sleeve and the drill bush must have a very low coefficient of friction, at most equal to 0.2 according to the ASTM G77 standard, preferably at most equal to 0.15.
• the coefficient of friction is around 0.15, roughly equivalent to a Steel/Steel combination.
• bronze is a self-lubricating material which is a particularly interesting characteristic for the drilling device and its drilling function.
• the drilling device according to the invention may possibly comprise conventional means of lubrication, approved for the field of use so as not to pollute the tank and its container, the external surface of the coating sleeve and/or the internal surface of the drill bush. Be careful, however, to use approved lubricants that do not pollute the tank and its insulation technology.
• the coating sleeve can also be made of polymer, or even of composite materials with an outer surface, close to the drill bush, free or almost free of fibers or the like.
• the main body houses a plurality of drill bushes, preferably at least six drill bushes.
• Such a characteristic of the drilling device according to the invention makes it possible to operate a plurality of drillings, without requiring the movement of said device on the wall.
• the drill/coating sleeve assembly is removably mounted in the drill bush so that the operator proceeds to the placement/positioning of the main body on the wall, the barrel being placed opposite the hole to be made, then the drill bit/coating sleeve assembly is inserted into the drill bush.
• the operator can check the correct positioning of the device with regard to the holes to be made by looking through the orifice of the drill bush, before the introduction of the drill fitted with its coating sleeve.
• the drill bushes are mounted in pairs of drill bushes, advantageously by means of a base, movable on the main body, preferably the main body comprising a means of measuring the distance between each pair of drill bushes.
• the drill bushes are preferably mounted in pairs on plates previously drilled to accommodate them.
• the plates are assembled in a slide on the main body allowing a linear movement of each plate and therefore a linear movement of each pair of drill bushes.
• a means of measurement makes it possible to precisely position each plate in the desired location and therefore each pair of barrels in the desired location.
• pairs of drill bushes responds to a particular feature of GST or GBS tanks in which pairs of studs - two studs located at a predefined distance from each other - are common. Furthermore, the fact that these pairs of drill bushes are movable relative to each other on the main body of the drilling device offers maximum flexibility and adaptability of the device, hence saving time for the operator.
• the main body consists of a metal plate and/or polymer or composite material, preferably the main body consists of an aluminum plate.
• platinum refers to a profile made of material, advantageously metallic, preferably aluminum.
• the plates present on the main body are advantageously metallic, for example aluminum like the main body or in another material, such as steel.
• such a main body is particularly light, while providing adequate rigidity and mechanical strength for its use.
• said drilling device comprises a suction system for the dust originating from the drilling.
• Such suction makes it possible in particular to avoid any phenomenon of clogging and disturbances of the sliding or sliding of the coating sleeve in the drill bush. This suction also prevents pollution of the tank and its container.
• the aforesaid dust suction system comprises a chamber fixed, preferably in a removable manner, to the drill bush, a pipe opening into said chamber serving to suck up the dust, and to evacuate it.
• the suction system is preferably of the conventional type, and more particularly comprises a conventional pump.
• a conventional pump is understood to mean, for example, a construction pump.
• this conventional pump is not a Venturi type pump.
• the main body comprises means for fixing to the wall. It is important to consider here that this fixing means must respect the integrity of the vapor barrier.
• the means of attachment to the wall consists of at least one suction cup, preferably a plurality of suction cups, preferably operating by suction of the Venturi effect type.
• the exhaust from the pumps or Venturi must include filters in order to avoid any risk of pollution of the tank and its insulation system due to the particles of water or oil contained in the compressed air. .
• the exhaust from the pumps or Venturi preferably includes a silencer in order to reduce the annoying noise pollution for the operators.
• Such a partial vacuum created by the Venturi effect is advantageous because GST or GBS type tanks conventionally have a pressurized gas network (compressed air) and/or such a pressurized gas network, which is particularly suitable for mounting/assembling such tanks, given that it does not use flammable/explosive fluid for its operation.
• the suction by Venturi effect conventionally comprises a main pipe having an inlet capable of being connected to a source of pressurized gas and an outlet, a suction pipe having an upstream side capable to be connected to the outlet port of the suction system of the drilling device and a downstream side opening laterally into a convergent-divergent part of the main pipe so that a flow of gas in the main pipe produces a depression in the suction line.
• the suction system can also consist of a conventional pump, in other words which is not a Venturi effect, which operates with an electrical power source. Provision can also be made for the suction system to comprise one or more so-called conventional pumps and one or more Venturi effect pumps, these various pumps being capable of being implemented together or not depending on the choice of the operators carrying out the operations at the regard to environmental conditions and/or other factors.
• the coating sleeve comprises, at its end opposite the drill head, a stop collar limiting the travel of the coating sleeve in the drill bush.
• the drill bush is mounted removable and movable in the main body so as to adjust the distance of said barrel from the wall, preferably said device comprising at least one drill bush clamp to hold said barrel in its position at the desired distance from the wall.
• said collar of the coating sleeve as well as the movement of the drill bush and its fixing by the clamping collar, are simple, inexpensive and effective mechanical means, making it possible to offer perfect adaptability of the drilling device, whatever the depth of the hole to be made and/or the uneven surface level of the wall (see for example FIG. 8 on this aspect on which it can be seen that the wall is not flat).
• said drilling device further comprises an independent element for positioning the main body on the wall in order to make the holes.
• this positioning element consists of an independent part of the main body makes it possible to dissociate the objective or the function of placing or locating the holes to perform the main functions of the holes carried by the main body.
• the positioning element is placed, and fixed, on the wall with regard to the markings present on the latter to locate the holes, then in a second step, we come to report and fix the main body to the positioning element.
• This method allows greater reliability as to the location and location of the holes to be made. It should be noted here that an additional verification of the location or the actual location of the drilling to be carried out can be carried out by the operator by looking into the drill bush, free at this stage of the drill bit/sleeve assembly. coating.
• main body intrinsically having means for locating and positioning the drill bit for making the holes, at the chosen location on the wall.
• the independent positioning element of the main body comprises means for fixing to the wall, preferably said fixing means consisting of a suction cup of the Venturi effect type.
• the invention also relates to a system for drilling a concrete wall or the like of a liquid storage tank, comprising:
• a storage tank preferably of the GBS or GST type, for storing a liquid, said tank comprising at least one concrete wall or the like;
• the present invention relates to the use of a drilling device as briefly presented above for drilling a concrete wall or the like of a storage tank for a liquid, preferably a GBS or GST type storage tank.
• a drilling device as briefly presented above for drilling a concrete wall or the like of a storage tank for a liquid, preferably a GBS or GST type storage tank.
• Figure 1 is a perspective representation of a GST type tank, that is to say an onshore storage tank.
• Figure 2 is a schematic sectional view of a drill bush, a drill bit and a sleeve according to the present invention, positioned facing a wall.
• FIG.3 Figure 3 is a view identical to that of Figure 2 in which the drill bit has penetrated all the way into the wall.
• Figure 4 is a schematic sectional view of a drill bush, a drill and a sleeve according to the present invention, the drill bush being shown independent of the drill assembly / coating sleeve.
• Figure 5 is a schematic top view of a main body of a drilling device according to the invention.
• Figure 6 is a schematic side sectional view of the main body shown in Figure 5, in which a drill is drilling a wall.
• Figure 7 is a schematic side sectional view of the main body shown in Figure 5, in which we can see the possible movement of a drill bushing as well as its clamp to maintain the position desired.
• Figure 8 is a schematic side sectional view of a main body substantially identical to that shown in Figure 5, in which there are in particular the chambers used to suck dust positioned on each barrel of drilling.
• Figure 9 is a schematic side sectional view of a main body substantially identical to that shown in Figure 5, in which there are in particular the circlips intended to maintain the position of the barrel or barrels drilling of the drilling device according to the invention.
• Figure 10 is a schematic top view of a main body disposed against a wall and a positioning element of said main body to make the holes in the correct location on the wall.
• Figure 11 is a view identical to that of Figure 10 in which the positioning element is fixed to the main body so that the drilling device is ready to make the holes in the right place on the wall.
• the term "vertical” here means extending in the direction of the earth's gravity field.
• the term “horizontal” here means extending in a direction perpendicular to the vertical direction.
• a longitudinal direction corresponds to a main direction of extension of the sealed and thermally insulating tank, this longitudinal direction being parallel to a longitudinal axis L of a reference L, V, T illustrated in the figures.
• a transverse direction corresponds to a direction parallel to a transverse axis along which mainly extends a front wall of the sealed and thermally insulating tank, this transverse direction being parallel to a transverse axis T of the reference L, V, T and this axis transverse T being perpendicular to the longitudinal axis L.
• a vertical direction corresponds to a direction parallel to a vertical axis V of the reference L, V, T, this vertical axis V being perpendicular to the longitudinal axis L and the axis transverse t.
• Figure 1 illustrates a sealed and thermally insulating tank 1 taking the overall shape of a rectangular parallelepiped which may consist of a GST tank.
• the vessel 1 comprises a storage structure 2 and a supporting structure 4 enveloping the storage structure 2.
• the storage structure 2 is configured to contain and/or store a fluid, and more particularly a cryogenic liquid, such as for example natural gas liquid or liquefied petroleum gas.
• the storage structure 2 comprises a plurality of walls resting against the support structure 4. The latter is configured to support the plurality of walls when the tank 1 is at least partially filled with this fluid, this fluid exerting pressure on each of the walls of the plurality of walls.
• this type of tank 1 is used in the terrestrial storage of liquid natural gas to contain liquid natural gas and/or as a loading and/or unloading point for a maritime transport vessel, such as for example a gravity platform (GBS type tank).
• GGS gravity platform
• “Gravity platform” means that the tank is at least partially submerged, in a port for example, and that a liquefaction and/or gasification unit is installed at the level of the ceiling of the tank. More precisely, the tank 1 can collaborate with the liquefaction and/or gasification unit so that the tank stores liquefied gas coming from the liquefaction unit and/or supplies the gasification unit with liquefied gas.
• the tank 1 extends mainly along a longitudinal direction L.
• the plurality of walls of the storage structure 2 comprises a ceiling wall 6 and a bottom wall 8 each extending generally in a parallel plane to the longitudinal direction L and to a transverse direction T, the latter being perpendicular to the longitudinal direction L.
• the storage structure 2 also comprises a plurality of side walls 10a, 10b extending at least along a vertical direction V perpendicular to the longitudinal direction L and to the transverse direction T between the bottom wall 8 and the ceiling wall 6.
• the plurality of side walls 10a, 10b here comprises two longitudinal walls 10a parallel to each other and two front walls 10b parallel to each other .
• the longitudinal walls 10a extend along the longitudinal direction L, the front walls 10b extending for their part along the transverse direction T between the two longitudinal walls 10a.
• the walls 6, 8, 10a and 10b comprise a layer of vapor barrier which aims to protect the concrete from contact with water.
• this vapor barrier allows a good bond with the mastic which is used to rest the sealed and thermally insulating installation which will equip the GST 1 tank.
• This vapor barrier is conventionally made of epoxy resin, reinforced with fiberglass, and must not be damaged at the risk of losing its function as explained above. This is why assembly/assembly operations, in particular drilling operations, must not damage this vapor barrier.
• the support structure 4 takes the form of the storage structure 2, enveloping the latter.
• the supporting structure 4 comprises a plurality of partitions 9, each of its partitions 9 advantageously extending parallel to one of the walls of the plurality of walls.
• the present invention relates to a device for drilling walls such as those 6, 8, 10a and 10b of the GST tank 1 but it is in no way limited to this type of tank or even to this type of walls 6, 8, 10a and 10b.
• the applicant has produced such a drilling device to first solve the problems associated with current drillings made in these GST or GBS type tanks, so that certain characteristics of the invention are advantageously adapted to these types of structures.
• FIG 2 are illustrated the main elements of the drilling device according to the invention, namely a drill 11 with its drill head 1 T, a coating sleeve 12 fixed around the drill 1 1 and a drill bush 13 in which the assembly formed by the drill 11 and its coating sleeve 12 slides.
• the latter 30 advantageously comprises a plurality of drilling units 11, 12, 13 in order to carry out a maximum of drilling once the device 30 has been positioned and fixed to the wall 6, 8, 10a or 10b.
• L2 active length of the drill 11, in other words the length of the drill 11 protruding outside the coating sleeve 12 which can be used to pierce a wall 6, 8, 10a or 10b.
• L2 is here at least equal to 60 millimeters in order to adapt, with an additional safety length, to the holes to be made conventionally in the walls 6, 8, 10a or 10b of a GST 1 tank.
• this distance L2 is much greater, or even possibly smaller.
• D the diameter of the coating sleeve 12.
• An essential characteristic of the present invention resides in the sliding fit H7g6, as defined according to the ISO 8015 standard, between said sleeve 12 and the drill bush.
• such an embodiment means that if the diameter D of the coating sleeve 12 is approximately equal to 60 millimeters, the diameter D of the coating sleeve 12 is actually included in the following inequality:
• L3 the length of penetration of the coating sleeve 12 into the drill bush 13. At the start of travel or travel, when the collar 14 of the coating sleeve 12 has come into abutment against the drill bush 13, as shown in figure 3, this penetration length L3 is at least equal to the length L, i.e. two and a half times the diameter D: L > 2.5 D.
• the coating sleeve 12 is fixed to the drill 11 by any means, mechanical and/or physico-chemical. In the example chosen to illustrate the invention, the coating sleeve 12 is fixed to the drill bit 11 by welding.
• the coating sleeve 12 comprises a stop collar 14 whose function is to limit the stroke of the sleeve 12 in the drill bush 13.
• the stroke L of the coating sleeve 12 in the drill bush 13 is at least equal to two and a half times the diameter D.
• the coating sleeve 12 is guided in sliding fit H7g6 according to the ISO 8015 standard over a sufficient distance so that, during drilling, the vibrations are attenuated, or even totally eliminated, and so that there is no buckling or deviation, however slight it may be, of the drill bit 11 and its drill head 11'.
• the drill bush 13 bears against the wall 6, 8, 10a or 10b via buffers 15 made in one material that does not damage the vapor barrier layer present on said walls 6, 8, 10a or 10b, for example made of polymer foam or rubber/elastomer.
• the drill bush 13 also includes a support collar 14 'allowing the abutment of the collar 14 of the coating sleeve 12. Nevertheless, such a support collar 14' is optional provided that the surface of the drill bush 13 facing the stop collar 14 is sufficient for the support of the latter 14, and this repeatedly, without deterioration of one or the other.
• the drill bush 13 advantageously contains a groove in which is housed a circlip 34. Therefore, the drill bush 13 can not fall from its base 16 when the device drilling 30 is positioned upside down, for example when the holes are to be made on the ceiling wall 6, when the clamp 22 is loosened.
• the drilling device 30 comprises four pairs of drill bushes 13 into which four pairs of drill bits 11, 11' can be inserted respectively.
• the drilling device 30 according to the invention normally uses a single and unique drill 11 provided with its coating sleeve 12, this assembly 11/12 being introduced successively into the different orifices of the main body 17 to perform the holes.
• Each pair of drill bushes 13 is mounted on a base 16 fixed to the main body 17 of the drill device 30.
• the main body 17 here consists of a rectangular bar, or plate, made of a light and resistant material, such as aluminum, and each base 16, also advantageously aluminum, is fixed movable along the longitudinal axis x'x of the main body 17.
• Each base 16 is fixed to the main body 17 substantially in the middle so that each drill bush 13 is positioned on either side of the longitudinal axis x'x, substantially at equal distance from said axis x 'x, the bases 16 extending along a perpendicular axis x'x.
• This arrangement of the drilling bushes 13 on the main body 17, and the general shape of the latter 17, are particularly suitable for making holes on a wall 6, 8, 10a or 10b of a terrestrial tank of cryogenic liquid, in particular GST or GBS, but of course the main body 17 and the relative positioning of the drill bushes 13 can be different and adapted to the structure in or on which the holes are to be made.
• the main body 17 comprises a graduation system 18 which makes it possible to measure the distance between two bases 16 and thus to position them at a distance desired relative.
• each base 16 is mounted movable along the x'x axis on the main body 17 so that the operator can place each base 16 at a determined distance from each other, corresponding to the holes to be made on the wall 6, 8, 10a or 10b.
• the piercing device 30 has a means of fixing to the wall 6, 8, 10a or 10b consisting here of a suction cup 19, fixed substantially to the center of the main body 17 so as to evenly distribute the fixing force to the wall at the level of the center of gravity of the main body 17.
• a plurality of suction cups 19 can be provided and such an arrangement of suction cups 19 depends mainly on a criterion of effectiveness as regards fixing with regard to the practical use of the drilling device 30 by the operators, preferably a single operator.
• the suction cup 19 operates by suction and more precisely by the Venturi effect; the suction cup 19, more precisely its suction chamber, being connected by a conduit 20 or the like to a compressed gas circuit so as to create the partial vacuum necessary for suction.
• each drill bush 13 is threaded or fitted into a dedicated hole on a base 16 itself fixed on the main body 17 and the height or the distance of each drill bush 13 can be adjusted thanks to its clamping collar 22.
• the drill bush 13 is positioned so that its support collar 14' is more or less far from the main body 17.
• the stop collar 14 of the coating sleeve 12 stops the stroke of the drill 1 1, 1 1 'at the desired depth for the drilling to be carried out.
• the drilling device 30 according to the invention is both simple and functional, and that all the parts or elements 11, 12, 13, 19, 22 are removable and therefore replaceable by new parts or elements, different in shape and/or size or simply new for the replacement of worn parts or elements.
• FIG 8 has been shown in particular the dust suction system when drilling a wall 6, 8, 10a or 10b.
• This dust extraction system comprises, in the embodiment chosen to illustrate the invention, a chamber 25 formed by an envelope, advantageously of conical shape, enclosing at least the end of the drill bit 11 over its length L2 and being fixed, advantageously in a removable manner, to the drill bush 13.
• This chamber 25 can be made of any material that is both flexible and strong enough to structurally hold the suction generated or created in the chamber 25.
• the suction system of the dust advantageously uses a conventional construction vacuum cleaner, not shown in the appended figures.
• This suction chamber 25 allows the suction of dust and is calibrated according to the depth of the desired drilling.
• the drill bush 13 is positioned on this chamber in order to obtain the correct height to perform the desired drilling.
• An O-ring 33 is advantageously integrated at the end of the coating sleeve of the drill 11 in order to avoid any entry of dust between the drill bush 13 and the coating sleeve 12 which could cause premature wear of these last 12, 13.
• this independent positioning element 27 of the main body 17 consists of a rectangular-shaped part having at least one fixing means 28, in this case two fixing means 28, capable of being connected to reception portions 28' of the main body 17.
• the means of attachment 28 of element 27 may consist of a male part cooperating with a receiving portion 28' consisting of a female part to effect the attachment of the main body 17 to the independent positioning element 27.
• the receiving portion(s) 28 are advantageously located at one or the other of the two ends of the main body 17, advantageously at the two ends of said main body 17 so that the main body 17 can be connected and fixed to two independent elements.
• positioning tooth 27 located respectively at the two opposite ends of the main body 17.
• reference marks 24 have been previously drawn on the wall or walls 6, 8, 10a and/or 10b in order to specify, with regard to the dimensioning of the hole 30, the location of the holes to be made on said walls 6, 8, 10a and 10b.
• These reference marks 24 conventionally consist of lines drawn on the walls 6, 8, 10a, 10b extending horizontally and vertically, along the axes L, T, V of the tank 1.
• the independent positioning element 27 is placed at the intersection of lines extending horizontally and vertically with a central positioning ensured by a notch, a line or the like 31 present in the center of the element 27.
• the independent positioning element 27 is fixed to the wall 6, 8, 10a or 10b using a suction cup 29 connected or fixed to said element 27.
• This suction cup 29 constitutes one embodiment of a means for fixing the independent positioning element 27 to a wall 6, 8, 10a, 10b but any different system can of course be envisaged.
• this suction cup 29 advantageously functions identically to the suction cup 19 so that all of the fastening means can function thanks to a connection to a single compressed gas circuit, by Venturi effect.
• the drilling device 30 first comprises the essential parts and elements defined in independent claim 1 and advantageously the additional part(s) or elements defined in the dependent claims.

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• Auxiliary Devices For Machine Tools (AREA)

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Citations (4)

• 2020
  • 2020-12-17 FR FR2013510A patent/FR3117902B1/fr active Active
• 2021
  • 2021-12-17 WO PCT/EP2021/086431 patent/WO2022129485A1/fr active Application Filing
  • 2021-12-17 CN CN202180085942.2A patent/CN116685427A/zh active Pending
  • 2021-12-17 EP EP21840851.6A patent/EP4263097A1/fr active Pending

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