EP4227467A1 - Mèche de forage pour un dispositif de forage permettant de créer des trous de forage dans un terrain de fondation - Google Patents

Mèche de forage pour un dispositif de forage permettant de créer des trous de forage dans un terrain de fondation Download PDF

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Publication number
EP4227467A1
EP4227467A1 EP22155979.2A EP22155979A EP4227467A1 EP 4227467 A1 EP4227467 A1 EP 4227467A1 EP 22155979 A EP22155979 A EP 22155979A EP 4227467 A1 EP4227467 A1 EP 4227467A1
Authority
EP
European Patent Office
Prior art keywords
drill
plate
drill bit
drill head
base plate
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.)
Pending
Application number
EP22155979.2A
Other languages
German (de)
English (en)
Inventor
Daniel Leuenberger
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.)
Marti Gruendungstechnik AG
Original Assignee
Marti Gruendungstechnik AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Marti Gruendungstechnik AG filed Critical Marti Gruendungstechnik AG
Priority to EP22155979.2A priority Critical patent/EP4227467A1/fr
Publication of EP4227467A1 publication Critical patent/EP4227467A1/fr
Pending legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/72—Pile shoes
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22—Piles
    • E02D5/24—Prefabricated piles
    • E02D5/28—Prefabricated piles made of steel or other metals
    • E02D5/285—Prefabricated piles made of steel or other metals tubular, e.g. prefabricated from sheet pile elements
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22—Piles
    • E02D5/52—Piles composed of separable parts, e.g. telescopic tubes ; Piles composed of segments
    • E02D5/523—Piles composed of separable parts, e.g. telescopic tubes ; Piles composed of segments composed of segments
    • E02D5/526—Connection means between pile segments
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22—Piles
    • E02D5/56—Screw piles
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
    • E02D7/22—Placing by screwing down
    • 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
    • E21B10/42—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits
    • E21B10/43—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits characterised by the arrangement of teeth or other cutting elements

Definitions

  • the present invention relates to a drill bit for a drilling device for creating boreholes in a subsoil, in particular an insufficiently bearing subsoil.
  • the drill bit can be placed on a drill pipe of the drilling device and can be releasably connected to the drill pipe, the drill pipe being able to be closed by a base plate of the drill bit. Proceeding from a base plate, the drill bit forms the drill bit which extends essentially perpendicularly thereto and which is pushed into the ground in a rotating manner.
  • a tip unit called the drill head or drill bit
  • drill pipe which advantageously seals the drill pipe in a watertight manner.
  • Drill tube and drill tip are secured against twisting and are detachably connected to each other.
  • the drill pipe is screwed into the ground to the required depth or possibly rammed under high vertical pressure, with the ground material being largely displaced in the radial direction by the volume of the drill pipe.
  • the drill bit can have at least one cutting edge, which loosens and displaces the soil material.
  • a prefabricated pile reinforcement for example a reinforcement cage
  • the drill pipe is filled with concrete to create in-situ concrete piles become.
  • the drill pipe which can be pushed in, also serves as a support for the soil.
  • the drill pipe can be withdrawn from the well with continuous rotation, the drill pipe detaching from the drill bit, which remains in the subsoil as a lost part.
  • the drill pipe is pulled back, the concrete in the drill pipe flows into the resulting cavity in the ground and fills it up to the required level. After the concrete has hardened, there is a loadable, possibly reinforced displacement pile.
  • Drill bits in connection with the production of displacement bore piles are exposed to considerable wear and tear and large forces depending on the nature of the subsoil and remain in the ground as so-called lost drill bits as intended. Accordingly, on the one hand a robust and on the other hand a cost-effective production of such drill bits is in the foreground.
  • a drill bit which consists of cast steel and is designed as a metallic hollow cone body with a helical nose running continuously around the outer circumference of a pointed thread core. So far, drill bits that can be produced as cast parts have been relatively expensive to produce, particularly if the cast forms are not rotationally symmetrical or simple.
  • Drill bits are also known which can be assembled from simply formed, plate-shaped cast parts or from steel parts which are previously cut, bent and welded.
  • a drill bit for an earth drilling device which comprises a base plate which can be connected to a drill pipe and on which at least one drill bit top plate which is oriented essentially perpendicular thereto can be placed. At least one arcuate plate can be inserted into the lateral flanks of the drill bit head plate and fastened thereto by means of holding means. The arrangement and the shape of the at least one arcuate plate is such that its surfaces act as screw surfaces during the drilling process.
  • the object of the present invention is to overcome the aforementioned disadvantages and to design a drill bit in such a way that it can be produced with little effort and cost-effectively and can be expanded in a modular manner in order to be adaptable to the respective requirements for creating boreholes.
  • a further aspect of the present invention is to provide a tilt-proof drill bit which can be connected to a drill pipe of the drilling device in a non-rotatable and detachable manner, even if the drill bit is of an asymmetrical design.
  • the aims are mainly achieved by the subject matter of the independent claims. Further advantageous embodiments also emerge from the dependent claims and the description.
  • a drill bit also referred to as a drill head
  • a drill head for a drilling device for creating a borehole in a subsoil
  • the drill bit can be placed on a drill pipe of the drilling device and forms a detachable connection secured against rotation
  • the drill bit comprises a base plate and at least one drill head plate which is arranged on the base plate and extends essentially perpendicularly to the base plate.
  • the base plate and the at least one drill head plate form a one-piece drill head basic shape which tapers to a point in a region facing away from the base plate.
  • This drill head basic form can be produced particularly inexpensively and easily using a suitable manufacturing process and can be transported to the site of use.
  • the basic shape of the drill head is a one-piece or integrally designed basic shape, which can be expanded as required, so that drill holes can be created as effectively and without wear as possible in different building grounds is possible.
  • the drill bit comprises at least one arcuate plate, which is designed such that its surface forms parts of helical surfaces during drilling.
  • At least the basic form of the drill head comprising the base plate and the at least one drill head plate extending substantially perpendicularly from the base plate, is manufactured by means of a casting process.
  • a suitable casting process can be selected in order to produce a drill bit that is robust but cost-effective in use.
  • Other suitable manufacturing processes are conceivable, for example printing processes.
  • the invention provides a drill bit in a basic form which can be expanded by individual elements, regardless of whether arcuate plates already functioning as helical surfaces are formed on the drill head basic form formed in one piece or not.
  • the arrangement and/or design of the arcuate plates can be provided independently of the requirements of a casting process, with drill bits being able to be produced specifically for the respective application.
  • the drill head basic form includes the base plate and the at least one drill head plate, wherein the at least one arcuate plate can be arranged or inserted in a suitable position on the drill head basic form and can be held by means of holding means, for example with a positive fit.
  • the at least arcuate plate can be arranged and held on the drill head basic form by means of welding or bolting or another suitable connection.
  • the at least one drill head plate of the drill head basic form can be designed in such a way that its side edges protrude beyond the peripheral edge of the base plate.
  • the diameter of the base plate corresponds at least to the outer diameter of the drill pipe, so that the soil is displaced so far during the drilling process by means of protruding edge areas that sufficient free space is formed between the drill hole and the drill pipe in order to be able to keep the friction for the drill pipe in the drill hole as low as possible.
  • this can also be achieved by a corresponding shaping of the at least one arcuate plate.
  • the at least one drill head plate has a base body, which comprises a region tapering to a point opposite the base plate.
  • the shape of this tip can be designed depending on the soil to be drilled. Accordingly, the shape of the base body of the at least one drill head plate can be adapted depending on the nature of the subsoil. It has proven particularly advantageous that the shape of the tip is asymmetrical, so that a displacement effect can be achieved in addition to the at least one curved plate.
  • a first drill head plate and a second drill head plate which is aligned essentially at right angles thereto, are provided on the base plate, which integrally form the basic shape of the drill head.
  • a second drill head plate can also be used as an individual element and can be held in place by suitable means.
  • a first arcuate plate is insertable between two adjacent flanks of the bit plates and a second arcuate plate may be disposed oppositely between respective flanks.
  • an arcuate plate can advantageously extend over a flank of the first drill head plate and an adjacent flank of the second drill head plate, and a second arcuate plate on the opposite side.
  • both arcuate plates can be of comparable design.
  • the somewhat symmetrical arrangement of the two arcuate plates form a drill head which, when in use, shows little tendency to tilt, so that accidental detachment from the drill pipe during the drilling process is avoided.
  • a third arcuate plate in the area of the tip formed on the side facing away from the base plate, in the area tapering to a point, a third arcuate plate can be arranged, which further improves the efficiency of the drilling process.
  • the at least one arcuate plate that is or can be arranged on the drill head basic shape at least partially has an outer diameter that is larger than the outer diameter of the base plate, so that the at least one arcuate plate has at least one edge region that protrudes partially beyond the base plate. Accordingly, the outer edge of the arcuate plate runs at a varying distance from a drilling axis. This means that the screw surfaces formed by the at least one arcuate plate can be used effectively to displace the soil radially.
  • the drill bit according to the invention ensures that, thanks to the expansion options, the basic shape of the drill bit can be adapted to the requirements and special features of the subsoil and the drilling task.
  • the small number of shapes to be stored means low production costs, uncomplicated transport to the place of use and quick adaptation of the basic shape of the drill head.
  • the at least one arcuate plate is produced by cutting it out of a commercially available steel plate or another suitable material and this can be inserted into the basic drill head shape or at least one drill head plate. In this way, the costs can be kept low and, at the same time, a diverse modulation of the drill head can be carried out in a simple manner to adapt to the on-site conditions.
  • the at least one arcuate plate is designed as an individual element, it can be inserted and held on the drill head plate or plates by means of holding means designed in a complementary manner.
  • the holding means can be designed as projections and slot-shaped recesses.
  • the combination of a basic drill head shape and an extension of this basic drill head shape by means of one or more curved plates has proven to be very advantageous in terms of the range of possible uses and the costs. Since the number, shape, size and possibly also the material of the curved plates can be selected, the drill bit can be adapted to the specific soil conditions, while at the same time the basic shape of the drill head creates a sensible and stable starting point.
  • the design of the drill head basic shape manufactured in one piece using a manufacturing process can vary, i.e. only include a base plate and a drill head plate, up to a shape formed from a base plate, several drill head plates and at least one arcuate plate.
  • a further aspect of the invention relates to the fact that a drill bit is provided with connection means for a non-rotatable and detachable connection to a drill pipe in order, on the one hand, to optimally transmit the rotational movement of the drill pipe to the drill head and, on the other hand, to prevent the drill bit from tilting relative to the drill pipe .
  • the connecting means with which the drill tip can be connected to the drill pipe can, for example, be separated from the base plate projecting projections may be formed.
  • slots are provided at the end area of the drill pipe, into which the projections of the base plate protrude.
  • the projections or webs or segments can have an approximately L-shape.
  • one of the legs protrudes from the base plate largely perpendicularly over a definable length and forms a contact surface with the inner circumference of the drill pipe.
  • Other forms of connecting means are conceivable, for example in the form of webs which are designed to form a torsion-proof and detachable connection with the drill pipe on the one hand and a contact surface or guide surface on the inner circumference of the drill pipe on the other hand.
  • the number and design of the connectors can vary.
  • Suitable connecting means can be formed in one piece on the base plate of the drill head basic form or can be formed as individual components that can be connected to it.
  • a drill bit 1 can be seen, which has a drill head basic shape 2 .
  • the drill head basic form 2 has a base plate 3 and at least one drill head plate 4 extending essentially perpendicularly to the base plate 3.
  • several drill head plates 4 can be provided.
  • two drilling head plates 4 arranged at right angles to one another can be arranged.
  • the drill head basic form 2 can be produced as one piece with a suitable production process, in particular in a casting process, and thus forms a cast part.
  • the at least one drill head plate 4 tapers to a point in the area facing away from the base plate 3 and accordingly forms a Tip 10.
  • the drill head base 2 is detachably connected to a distal end portion of a drill pipe 5 (not shown), as will be described later.
  • the drill pipe 5 is driven in a known manner by a drilling device, not shown, to rotate about a drilling axis 6 and is pressed into the drill bed while rotating.
  • the drill bit 1 comprises at least one arcuate plate 7, which is provided on the drill head basic shape 2 in such a way that these act as helical surfaces during the drilling process.
  • a drill bit 1 known per se is shown with an arcuate plate 7 which is formed integrally with one drill head plate 4 .
  • the curved plate 7 formed on is positioned on the drill head basic form 2 in such a way that it forms a pitch angle ⁇ with respect to the drilling axis 6 .
  • the degree of the pitch angle ⁇ can be in a range from 10° to 30°. In the embodiment shown, the angle of inclination ⁇ is approximately 20°, but can be varied in order to be optimally adjusted depending on the nature of the subsoil. This can increase the efficiency of the drilling process.
  • the drill head basic form 2 comprises the base plate 3 and a first drill head plate 4a and a second drill head plate 4b, which are formed integrally with the base plate 3 and are provided in a perpendicular arrangement to one another.
  • the shape of the tip 10 of the drill bit 1 can be formed by a main body 40 of the first drill head plate 4a and/or the second drill head plate 4b and extends along the drilling axis 6.
  • the main body 40 of the at least one drill head plate 4a can be designed in such a way that a rather rectangular section and an adjoining pointed section or area are formed.
  • the base body 40 of the at least one drill head plate 4 can have an approximately triangular shape with the tip 10 overall. It is also shown that the at least one arcuate plate 7 can be inserted into the basic shape 2 of the drill head. A usability is particularly advantageous when the design of the arcuate plate 7 is selected to match the subsoil.
  • a molded arcuate plate 7a is shown, which extends between a flank 9a of the first drill head plate 4a and up to a flank 11a of the second drill head plate 4b.
  • the arcuate plate 7a is formed integrally with the drill head base 2, that is, it is not insertable.
  • a second arcuate plate 7b is inserted into the first drill head plate 4a and into the second drill head plate 4b, which is preferably of the same design as the first arcuate plate 7a.
  • retaining means 12 are provided or formed on the latter, which are set up to engage with retaining means 13 (not shown) provided complementarily on the respective drill head plates 4a, 4b to hold the second arcuate plate 7b in position.
  • a drill bit 1 with insertable and molded arcuate plates 7 expands the possible variations of the drill bit 1.
  • the formed plate 7a is designed such that the radial distance of the outer edge to the drilling axis 6 of this arcuate plate 7a, starting from an area on which the arcuate plate 7a is formed on the flank 11a of the drill head plate 4b, to an area on which the arcuate plate 7a is formed on the flank 9a of the drill head plate 4a, is increasing.
  • arcuate plates 7a and 7b are individual elements which can be combined with the drill head basic shape 2 in order to adjust the drill bit 1 according to the prevailing conditions. Due to the symmetrical arrangement and comparable design of the arcuate plates 7a, 7b, a drill bit 1 is provided which exhibits smooth turning behavior and largely does not tend to buckle during the drilling process.
  • FIG 4 a third embodiment of the drill bit 1 according to the invention is shown, in which a total of three arcuate plates 7a, 7b and 7c can be combined with the drill head basic shape 2.
  • the third arcuate plate 7c can be inserted and held in a position which is in the region of the tip 10. It is possible that at least one of the arcuate plates 7 is integrally formed on the drill head basic form 2 and the second arcuate plate 7b and/or a third arcuate plate 7c can be inserted into the drill head basic form 2 . Variants are also possible, for example if all arcuate plates 7 are designed to be insertable.
  • FIG 5 An arcuate plate 7 that can be used on the drill head basic form 2 and a drill head plate 4 are shown.
  • the arcuate plate 7, shown as a part that can be used individually, is equipped with holding means 12.
  • These holding means 12 include projections 22.
  • Complementary holding means 13 (not shown), which as shown are provided on the at least one drill head plate 4, are designed as recesses 23, for example as slot-shaped recesses 23 on the flank or as a recess 23 in the base body 40.
  • the arcuate plate 7 is formed with a nose 24 which encloses the drill head plate 4 when the arcuate plate 7 is inserted.
  • a shoulder 25 can be formed on the arcuate plate 7, which shoulder rests against the drill head plate 4 when the arcuate plate 7 is inserted and thus supports it during the drilling process.
  • the drill bit 1 designed in this way shows optimal resistance to bending.
  • the drill bit 1 includes Accordingly, connecting means 30 for the non-rotatable and detachable connection to the drill pipe 5, in order to optimally transmit the rotational movement of the drill pipe 5 to the drill bit 1 on the one hand and to prevent the drill bit 1 from tilting relative to the drill pipe 5 on the other.
  • the connecting means 30, with which the drill bit 1 can be connected to the drill pipe 5, are in figure 6 designed as L-shaped projections 31 with projecting legs 32 projecting from the base plate 3 .
  • connecting means 30 can vary. In figure 6 four evenly distributed connecting means 30 are shown.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Civil Engineering (AREA)
  • Paleontology (AREA)
  • General Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
EP22155979.2A 2022-02-09 2022-02-09 Mèche de forage pour un dispositif de forage permettant de créer des trous de forage dans un terrain de fondation Pending EP4227467A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP22155979.2A EP4227467A1 (fr) 2022-02-09 2022-02-09 Mèche de forage pour un dispositif de forage permettant de créer des trous de forage dans un terrain de fondation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22155979.2A EP4227467A1 (fr) 2022-02-09 2022-02-09 Mèche de forage pour un dispositif de forage permettant de créer des trous de forage dans un terrain de fondation

Publications (1)

Publication Number Publication Date
EP4227467A1 true EP4227467A1 (fr) 2023-08-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP22155979.2A Pending EP4227467A1 (fr) 2022-02-09 2022-02-09 Mèche de forage pour un dispositif de forage permettant de créer des trous de forage dans un terrain de fondation

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EP (1) EP4227467A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1279793A1 (fr) 2001-07-26 2003-01-29 Beheersmaatschappij Verstraeten B.V. Tête de forage
EP1580397A1 (fr) * 2004-03-26 2005-09-28 BAUER Maschinen GmbH Trépan de forage
EP1878832A2 (fr) * 2006-07-14 2008-01-16 Decombi B.V. Ensemble pour former un élément de construction allongé souterrain, et élément de déplacement à utiliser dans cet ensemble
EP2146046A1 (fr) * 2008-07-15 2010-01-20 Marti Gründungstechnik AG Tête de forage pour un dispositif de forage destiné à la création de trous de forage dans un sol de fondation insuffisamment portant
EP3216974A1 (fr) 2016-03-10 2017-09-13 Marti Gründungstechnik AG Tete de forage pour un dispositif de forage destine a la creation de trous de forage dans un sol de fondation insuffisamment porteur
EP3771774A1 (fr) * 2019-07-30 2021-02-03 Marti Gründungstechnik AG Tête de forage, cage d'armature et unité de forage destinée à la fabrication de pieux

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1279793A1 (fr) 2001-07-26 2003-01-29 Beheersmaatschappij Verstraeten B.V. Tête de forage
EP1580397A1 (fr) * 2004-03-26 2005-09-28 BAUER Maschinen GmbH Trépan de forage
EP1878832A2 (fr) * 2006-07-14 2008-01-16 Decombi B.V. Ensemble pour former un élément de construction allongé souterrain, et élément de déplacement à utiliser dans cet ensemble
EP2146046A1 (fr) * 2008-07-15 2010-01-20 Marti Gründungstechnik AG Tête de forage pour un dispositif de forage destiné à la création de trous de forage dans un sol de fondation insuffisamment portant
EP3216974A1 (fr) 2016-03-10 2017-09-13 Marti Gründungstechnik AG Tete de forage pour un dispositif de forage destine a la creation de trous de forage dans un sol de fondation insuffisamment porteur
EP3771774A1 (fr) * 2019-07-30 2021-02-03 Marti Gründungstechnik AG Tête de forage, cage d'armature et unité de forage destinée à la fabrication de pieux

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