EP0010037B1 - Hohlbohrer zum Bohren bei der Herstellung von Betonpfählen - Google Patents

Hohlbohrer zum Bohren bei der Herstellung von Betonpfählen Download PDF

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Publication number
EP0010037B1
EP0010037B1 EP19790400690 EP79400690A EP0010037B1 EP 0010037 B1 EP0010037 B1 EP 0010037B1 EP 19790400690 EP19790400690 EP 19790400690 EP 79400690 A EP79400690 A EP 79400690A EP 0010037 B1 EP0010037 B1 EP 0010037B1
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European Patent Office
Prior art keywords
auger
fact
point
members
ribs
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Expired
Application number
EP19790400690
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English (en)
French (fr)
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EP0010037A1 (de
Inventor
Jean-Marie Labrue
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Individual
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Individual
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    • 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
    • E21B10/44—Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts
    • 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
    • E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
    • E02D5/36—Concrete or concrete-like piles cast in position ; Apparatus for making same making without use of mouldpipes or other moulds

Definitions

  • the present invention relates to methods of injecting concrete for in situ molding of piles in holes drilled with a continuous auger.
  • a technique is already known for drilling holes by means of a hollow auger by which concrete is injected after the end of drilling, at the same time as the auger is removed.
  • the hollow auger formed by a cylindrical body around which a helical drilling blade is fixed and which is terminated by a removable attack point closing the open lower end of the cylindrical body is screwed into the ground.
  • fresh pressurized concrete is sent from top to bottom which drives out this point and the auger is raised as the concrete arrives to fill the hole drilled with concrete and make the desired pile.
  • the removable attack point therefore remains at the bottom of the hole, below the stake, in this method. It is not recoverable.
  • a lost point must therefore be placed on the auger during the production of each pile, and this point cannot, for cost price reasons, be equipped with very good quality attack tools.
  • hollow augers have already been proposed, composed of several separate elements intended to be fixed end to end to each other, comprising a hollow cylindrical body allowing the flow of concrete inside the auger, provided at its periphery with a helical drilling blade and an attack point at the lower end of the hollow cylindrical body, capable of closing this end during drilling, in which the attack point is linked to the cylindrical body hollow.
  • the hollow auger also comprises means capable of pushing back the point to release an opening at the lower end of the hollow cylindrical body for the injection of concrete, and capable of holding the point secured to the hollow cylindrical body when it is in position pushed back while lifting the auger.
  • the auger finally comprises means for transmitting to its upper part an indication of the pressure exerted on the point during the injection of the concrete.
  • the hollow cylindrical body is composed of an outer casing and an inner tube of smaller diameter , conduits extending in the interval between the inner tube and the outer shell, to bring sludge or water to lubricate the borehole.
  • the tip is held integral with the hollow cylindrical body by means of four vertical tie rods.
  • the opening of the closed end takes place under the effect of the pressure of the concrete injected into the cylindrical body. The point is therefore pushed back purely passively.
  • This characteristic is not without presenting disadvantages; it is not possible to know the actual injection pressure of the concrete, but only the supply pressure at the top of the auger. In addition, due to its purely passive operation, it is impossible to detect a bad lowering of the point, for example when a foreign body such as a stone is introduced between the fixed part and the mobile part.
  • the present invention proposes, to remedy these drawbacks, a new auger, of the aforementioned type, which allows the control of the lowering of the point during the injection of the concrete, and of the pressure actually exerted at the injection point: these two factors are decisive for the quality of concrete molding.
  • the point is made integral with one of the elements of a piston-cylinder assembly placed at the drilling end of the auger, the other element of the assembly being integral with the cylindrical body and the hydraulic conduits being provided inside the hollow cylindrical body to bring oil into the cylinder to exert a push on the tip and indicate the pressure exerted on the tip.
  • the piston-cylinder assembly is constituted by a double-acting hydraulic cylinder, which receives pressurized oil to pull the point up against the end of the cylindrical body, or push it down.
  • This arrangement according to the invention makes it possible not to lose a point of attack in each borehole.
  • it has a great advantage during the concrete injection phase at the end of drilling because it allows easy control, permanently, of the concrete injection pressure.
  • the concrete exerts a pressure on the point forming a shutter valve and this pressure is transmitted directly to the hydraulic supply circuit of the jack so that one can measure the differential pressure between the thrust of the concrete on the inner face of the shutter when it comes out of the auger and the reaction on the external force of the injected concrete.
  • Calibrations carried out in situ according to the soil reaction module make it possible to determine the differential pressure range allowing good molding of the concrete pile.
  • it was difficult to control the pressure of the concrete because it could only be done at the top of the auger, that is to say that the weight of the concrete column in the drill bit; for example, in the case of soft soils, it is very possible that the weight of a concrete column of 20 meters induces at the base a pressure higher than the creep pressure of the soil and the pressure sensor at the top of the auger then measures a zero injection pressure which does not correspond to the reality of what is happening at the base.
  • the body of the auger is constituted by a core composed of two concentric tubes respectively an inner tube and an outer tubular envelope, separated and kept apart from one another by spacers placed in the interval between the two.
  • the spacers can be separated from the tubes or be integral with one or the other of the tubes.
  • Hydraulic conduits can be passed between the inner tube and the outer casing without damaging the concrete.
  • the resulting increase in diameter of the auger allows an increase in the drilling torque; in addition, the buckling rigidity of the auger is increased thanks to the presence of the two concentric tubes and spacers which hold them, especially if these extend over the entire length of the auger.
  • the auger is preferably composed of several elements placed end to end and fixed to each other by a bayonet system, each element being terminated by a tip having axial fingers which fit into a corresponding tip of a element opposite, and which is locked axially by relative rotation with respect to this other endpiece thanks to a set of notches (tenons and mortises) provided laterally on the fingers of each endpiece.
  • Ribs provided on the inner tube then serve to key the ends thus hooked to each other to prevent any relative rotation of the two auger elements after they have been placed end to end, nested and turned.
  • the auger of the invention comprises a hollow cylindrical body 1 at the outer periphery of which is welded a helical drilling blade 2 descending to the lower end of the body.
  • This lower end is open downwards but can be closed off by a valve 3 constituting at the same time an attack point for drilling. This point is provided with good quality cutting edges for drilling in the best conditions.
  • the valve tip 3 is mobile and can either come in the closed position (Figure 1) from the end of the cylindrical body, or be pushed down (Figure 2) in the concrete injection position.
  • the point In the closed position, the point is engaged by a lug 4 in a mortise 5 formed in the cylindrical body 2, or by other means capable of securing in rotation the point and the cylindrical body while retaining a obturation of the last.
  • the means for pushing down the tip 3 are constituted by a piston-cylinder assembly actuated hydraulically by an oil circuit extending over the entire length of the auger inside thereof, so as to be able be connected to a hydraulic control on the ground surface.
  • This hydraulic circuit comprises a line 6 for supplying pressurized oil in a direction tending to raise the point in the closed position and a line 7 for supplying pressurized oil with a view to lowering the point .
  • the double-acting piston-cylinder assembly is housed in an enlarged cylindrical part 8 at the base of the cylindrical body 1, so as not to reduce the passage section of the concrete inside the auger.
  • This assembly comprises a fixed cylinder 9 screwed onto the wall of the hollow cylindrical body 1 and delimiting between its external cylindrical surface and the internal wall of the enlarged part 8 of the cylindrical body 1 an annular chamber 11 capable of being filled with oil under pressure. by the pipe 6 which opens into this chamber 11. The latter is closed at its lower part by an annular rim 12 extending transversely to the outer wall of the cylinder 9.
  • a piston 10 is capable of moving in this annular chamber 11 by dividing it into an upper half chamber into which the pipe 7 opens and a lower half chamber into which the pipe 6 opens.
  • the piston is for this purpose formed of a wall cylindrical terminated by a transverse annular rim 13 which separates the chamber 11 into two half chambers and on which the fluid pressure is exerted, on one side or the other to move the piston coaxially with the cylinder 9 .
  • the tip 3 closes the open end of the cylindrical body 1 of the auger, and the post 4 is engaged in the mortise 5.
  • the piston pushes the tip 3 down, leaving free passage to let out the injected concrete.
  • the piston is made integral with the point for example by a rib 14 around which the passage is free for concrete when the point is pushed down.
  • FIG. 3 represents a general drilling installation using the auger according to the invention.
  • a drilling mast 15 is seen with a hydraulic rotation table 16 for driving the auger 17 in rotation, a rotation table which slides along the mast 15 and descends as the drilling advances and then rises during casting. concrete.
  • a pipe 18 for supplying fresh concrete is connected.
  • manometers 21 and 22 are placed in these pipes 19 and 20 for controlling the differential injection pressure of concrete.
  • the oil is supplied to the lines by a pump 23 and a distributor 24, graduated oil tanks 25 and 26 with sliders being interposed between the distributor and the lines 19 and 20 to allow control of the lowering of the pin 3 during concrete injection; this more or less large lowering corresponds in fact to a more or less large section of passage of the concrete in the borehole and therefore defines the flow rate of the concrete.
  • FIG. 5 is a cross section corresponding to FIG. 4.
  • conduits 39 serving to bring the hydraulic pressure to the means for moving the auger attack point (point not shown). ), means which are located at the bottom of the auger.
  • conduits 39 are sheltered from mechanical stresses liable to be caused by the presence of concrete inside the tube 34.
  • the spacers 33 extend over the entire length of the elements of the auger, the latter has excellent buckling resistance compared to a simple hollow cylindrical auger.
  • the torque applied to the auger may be greater given the increase in diameter for the same concrete passage section.
  • Figures 6 and 7 is shown the junction between two auger elements according to the invention, elements which are fitted and locked by a bayonet system.
  • the outer body 31 ′ of one of the elements of the auger and the outer body 31 ′′ of the other element of the auger have the end pieces 37, 38 (fig. 4) which are brought to an end at the end and nested one inside the other, the body 31 'ending with fingers projecting in the axial direction, arranged circumferentially according to a diameter less than or equal to the inside diameter of the body 31 "in order to be able to penetrate the latter ; these fingers 310 'in FIGS.
  • each finger 310 ′ or 310 ′′ has a notched lateral side, opposite a lateral side notched in a manner complementary to a rib 311 ′′ or 311 ′ respec tively in such a way that a rotation of the element 31 'relative to the element 31 ", causes a lateral interlocking of the fingers 310" of one element in the ribs 311 "of the other element and consequently locking in the axial direction since the lateral interlocking of the fingers 310 'with the ribs 311 "extending the fingers 310" is effected by mutual engagement of side edges notched in a complementary manner,
  • the inner tube 34 has at its outer periphery several longitudinal ribs 312 distributed in such a way that these ribs 312 can be inserted exactly between the fingers 310 'and the ribs 311 "; so that between the fingers 310 "and the ribs 311" once the elements 31 'and 31 "have been turned into their axial locking position.
  • the inner tube 34 is inserted axially with its ribs exactly in place between the fingers and ribs of each of the elements; it is then no longer possible to rotate the bodies 31 ′ and 31 ′′ relatively to each other since the ribs 312 prevent this rotation.
  • These ribs 312 can be constituted by the spacers 33 provided between the inner tube 34 and the outer casing 31 of the auger.
  • each body comprises four fingers 310 'or 310 "with their extensions 311', 311" inside the body, these fingers extending at an angle of 45 ° each so that there is just room to fit the fingers of one of the bodies between the ribs extending the fingers of the other body, the lateral notches of the fingers and their extensions have a depth corresponding to half of the circumferential extent of each finger, so that once the fingers of one of the bodies are nested in the extensions of the fingers of the other body after relative rotation of the two bodies, there remains for the ribs 312 a corresponding space at half of 45 ° and we will therefore choose ribs having this circumferential dimension and having as radial dimension the distance between the inner tube. of the outer tube.
  • the fingers projecting axially and their extensions inside the body have a radial dimension which corresponds to the interval between the inner tube and the outer tube of the auger.
  • the end pieces 37, 38 thus formed to connect two auger elements form an obstacle to the passage of the hydraulic conduits 39 provided in the interval between the two concentric tubes of the auger.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • Structural Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Earth Drilling (AREA)
  • Piles And Underground Anchors (AREA)

Claims (13)

1. Hohl-Erdbohrer für das Bohren von Löchern und Einformen von Betonpfählen, wobei sich der Bohrer aus mehreren endweise aneinander zu befestigenden Elementen zusammensetzt und umfaßt:
- einen hohlzylindrischen Körper (1), der außen mit einem wendelförmigen Bohrblatt (2) versehen ist,
- eine Angriffsspitze (3) am unteren Ende des hohlzylindrischen Körpers (1), die dieses Ende während des Bohrens verschließt und mit dem hohlzylindrischen Körper (1) über eine Einrichtung verbunden ist, durch welche die Spitze (3) für eine Freilegung einer Öffnung am unteren Ende des hohlzylindrischen Körpers (1) im Hinblick auf das Einspritzen von Beton zurückgedrückt und in zurückgedrückter Stellung während des Hochziehens des Bohrers in fester Verbindung mit dem hohlzylindrischen Körper (1) gehalten werden kann, und
- eine Einrichtung zur Übertragung einer Anzeige des beim Einspritzen des Betons auf die Spitze (3) ausgeübten Drucks an den oberen Teil des Bohrers, dadurch gekennzeichnet, daß die Spitze mit einem der Elemente eines am Bohrende des Bohrers angeordneten Kolben-Zylinderaufbaus (9, 10) fest verbunden ist, wobei das andere Element des Aufbaus mit dem hohlzylindrischen Körper (1) fest verbunden ist und Hydraulikleitungen (6, 7, 39) im Inneren des hohlzylindrischen Körpers (1) zum Leiten von 01 in den Zylinder für eine Ausübung eines Axialschubes auf die Spitze (3) und für eine Anzeige des auf die Spitze (3) ausgeübten Drucks vorgesehen sind.
2. Bohrer nach Anspruch 1, dadurch gekennzeichnet, daß der Kolben-Zylinderaufbau (9, 10) doppeltwirkend ein Hochziehen und ein Niederdrücken der Spitze (3) gestattend ausgebildet ist.
3. Bohrer nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß eine Uberwachungseinrichtung (21, 22) für den Betoneinspritz-Differenzdruck über Messung des Öldrucks im Hydraulikkreis (6, 7-19, 20) vorgesehen ist, wobei diese Einrichtung beim Eintreiben und Hochziehen des Bohrers an der Erdoberfläche verbleibt.
4. Bohrer nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der untere Teil des hohlyzylindrischen Körpers (1) für eine den Durchgang des Betons im Inneren des hohlzylindrischen Körpers (1) nicht behindernde Aufnahme des Kolben-Zylinderaufbaus (9, 10) erweitert ist.
5. Bohrer nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß sich der hohlzylindrische Körper (1) aus einem Außenmantel (31) und einem Innenrohr (34) kleineren Durchmessers zusammensetzt, wobei zur Festlegung der Radiallage des Innenrohres (34) bezüglich des Außenmantels (31) im Zwischenraum zwischen beiden Stege (33) angeordnet sind.
6. Bohrer nach Anspruch 5, dadurch gekennzeichnet, daß sich die Stege (34) über die gesamte Länge des Bohrers hinweg erstrecken.
7. Bohrer nach einem der Ansprüche 5 und 6, dadurch gekennzeichnet, daß sich die Hydraulikleitungen (39) im Zwischenraum zwischen Innenrohr (34) und Außenmantel (31) erstrecken.
8. Bohrer nach einem der Ansprüche 5 bis 7, dadurch gekennzeichnet, daß die Stege (33) mit dem Innenrohr (34) verschweißt sind.
9. Bohrer nach einem der Ansprüche 5 bis 8, dadurch gekennzeichnet, daß er aus getrennten Elementen aufgebaut ist, die jeweils in einem Ansatz (37, 38) enden, welcher in einen gegenüberliegend entsprechenden Ansatz (37, 38) eingreifen kann und sich durch Relativdrehung der Elemente nach Art eines Bajonettsystems verriegeln läßt.
10. Bohrer nach Anspruch 9, dadurch gekennzeichnet, daß jedes Bohrerelement in axialer Richtung vorspringende Finger (310') aufweist, die auf einem Umfang mit geringerem Durchmesser als demjenigen des Außenmantels (31') angeordnet sind, damit sie in den Außenmantel (31") des gegenüberstehenden Rohres eindringen können, wobei sich diese Finger (310') im Inneren des Körpers in auf der Innenwand des Außenmantels (31') ausgebildeten Rippen (311') fortsetzen und wobei diese Rippen am Innenumfang des Außenmantels (31') im Abstand voneinander liegen, damit ein Durchtritt für die Finger (310') gegeben und ein Ineinanderstecken der beiden Bohrerelemente möglich ist.
11. Bohrer nach Anspruch 10, dadurch gekennzeichnet, daß die Finger (310') seitlich Aussparungen und daß die die Finger (310') verlängernden Rippen (311') komplementäre Aussparungen aufweisen, welche bei ineinandergreifenden Elementen eine Relativdrehung der Elemente gestatten, welche die mit den Ausnehmungen versehenen Ränder der Finger (310') des einen Elements mit den mit den Ausnehmungen versehenen Rändern der die Finger (310") des anderen Elements verlängernden Rippen (311") in Eingriff bringt und die Elemente wechselseitig in axialer Richtung festlegt.
12. Bohrer nach Anspruch 11, dadurch gekennzeichnet, daß das Innenrohr (34) äußere Längsrippen (312) aufweist, die zur Drehverriegelung der Elemente nach dem Ineinanderstecken und der Relativdrehung der Elemente durch axiales Gleiten zwischen den Fingern (310', 310") und Rippen (311', 311") zur Einfügung gelangen.
13. Bohrer nach Anspruch 12, dadurch gekennzeichnet, daß die äußeren Rippen (312) des Innenrohres (34) für den Durchtritt der Hydraulikleitungen (39) durchbohrt sind.
EP19790400690 1978-09-27 1979-09-27 Hohlbohrer zum Bohren bei der Herstellung von Betonpfählen Expired EP0010037B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7827632 1978-09-27
FR7827632A FR2437468A1 (fr) 1978-09-27 1978-09-27 Tariere creuse pour le forage en vue du moulage de pieux en beton

Publications (2)

Publication Number Publication Date
EP0010037A1 EP0010037A1 (de) 1980-04-16
EP0010037B1 true EP0010037B1 (de) 1982-12-01

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EP19790400690 Expired EP0010037B1 (de) 1978-09-27 1979-09-27 Hohlbohrer zum Bohren bei der Herstellung von Betonpfählen

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EP (1) EP0010037B1 (de)
DE (1) DE2964153D1 (de)
FR (1) FR2437468A1 (de)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2516958B1 (fr) * 1981-09-22 1985-08-16 Dn Inzh Str Inst Dispositif pour confection par moulage de pieux creux et procede de confection de tels pieux en utilisant ce dispositif
BE903965A (nl) * 1985-12-31 1986-04-16 Coelus Gaspar Jozef Apparaat en methode om boorpalen uit te voeren.
AU585755B2 (en) * 1987-07-10 1989-06-22 Frankipile Australia Pty. Limited Method and apparatus for boring piles
BE1010638A3 (nl) * 1996-09-20 1998-11-03 Poorteman Frank Boor voor het maken van een paal in de grond en werkwijze die deze boor toepast.
CN102392598B (zh) * 2011-09-24 2013-08-14 邵金安 液压振动冲击器及其构成的桩工动力头
CN103899252B (zh) * 2014-04-23 2016-06-15 山西八建集团有限公司 水下喷浆固壁钻头
CN104452768B (zh) * 2014-12-05 2016-12-14 重庆晨宇机床制造有限公司 矩形灌注桩成孔机
CN106192996B (zh) * 2016-08-26 2018-06-26 武汉谦诚桩工科技股份有限公司 一种t形桩的施工方法及t形浇注桩施工用的t形钻具
CN110924424A (zh) * 2019-10-29 2020-03-27 国家电网有限公司 一种盐碱地区输电塔uhpc-nc组合桩基础及施工方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3300988A (en) * 1960-12-23 1967-01-31 Raymond Int Inc Apparatus for forming piles
FR1322130A (fr) * 1961-02-28 1963-03-29 Méthode et appareil pour former un pieu en béton dans le sol par forage
FR1595399A (de) * 1967-01-08 1970-06-08

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FR2437468A1 (fr) 1980-04-25
DE2964153D1 (en) 1983-01-05
FR2437468B1 (de) 1982-11-19
EP0010037A1 (de) 1980-04-16

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