EP1229172B1 - Verfahren und Einrichtung zur Herstellung von Bohrpfählen im harten Untergrund - Google Patents

Verfahren und Einrichtung zur Herstellung von Bohrpfählen im harten Untergrund Download PDF

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Publication number
EP1229172B1
EP1229172B1 EP02290128A EP02290128A EP1229172B1 EP 1229172 B1 EP1229172 B1 EP 1229172B1 EP 02290128 A EP02290128 A EP 02290128A EP 02290128 A EP02290128 A EP 02290128A EP 1229172 B1 EP1229172 B1 EP 1229172B1
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EP
European Patent Office
Prior art keywords
variable
tool
values
successive
depth
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Expired - Lifetime
Application number
EP02290128A
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English (en)
French (fr)
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EP1229172A1 (de
Inventor
Daniel Gouvenot
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Compagnie du Sol SARL
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Compagnie du Sol SARL
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D13/00—Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers
    • E02D13/06—Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers for observation while placing
    • 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
    • E21B44/00—Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems; Systems specially adapted for monitoring a plurality of drilling variables or conditions
    • 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
    • E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
    • E21B49/003—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells by analysing drilling variables or conditions

Definitions

  • the present invention relates to a method and a machine for producing piles bored in hard ground and in particular in granite soils.
  • the soil with suitable physical properties will be for example a hard rock and in particular granite.
  • the granite zone is sufficiently healthy, that is to say that the granite is non-friable and that it has little or no cracks which would be susceptible alter the mechanical resistance of the granite zone or, more generally, of the zone with high mechanical resistance.
  • the solution currently used consists in carrying out, in the ground where the piles are to be made, cores of relatively reduced diameter of the order of 20 to 30 cm used to take rock samples from the depth. coring.
  • a first object of the invention is to provide a method which makes it possible to ensure that the bored pile produced actually has an anchoring in a layer of ground having the required physical properties.
  • At least one variable representative of the quality of the subsoil is measured in real time, for successive predetermined depths, from measurements carried out using sensors mounted on the machine.
  • the calculated successive values of the variable are processed to determine or detect the fact that the variable has the required value substantially continuously for a predetermined depth difference, this predetermined depth difference corresponding to the required pile anchoring height. When such a difference in depth has been detected, drilling is stopped and the pile can then be made.
  • two distinct variables are calculated, representative of the qualities of the soil necessary for the detection of a layer of soil having the physical properties required in order to constitute an anchorage for the pile. drilled.
  • the detection of course relates to the values of the two variables and the drilling is interrupted when, for the two variables, there is a common predetermined depth difference.
  • the method makes it possible to obtain a more precise evaluation of the qualities of the subsoil and therefore to ensure more precisely that the layer of suitable hard ground has actually been drilled.
  • a second object of the invention is to provide a machine for making bored piles for implementing a method of the type mentioned above.
  • FIG. 1 shows a drilling machine 10 comprising a platform 12 on which a guide mast 14 is articulated.
  • a carriage 16 On the guide mast 14 is mounted a carriage 16 which itself carries a drilling head or rotation head 18.
  • a drill string 20 at the lower end of which is mounted a drilling tool 22.
  • the drilling head 18 comprises in particular a motor 24 for rotating the drill string.
  • the insertion of the tool 22 into the ground to carry out the drilling is controlled, for example, by a set of chains or belts 26 serving for the translational movement of the carriage 16 along the mast, the chains 26 being driven in displacement by a motor assembly 28.
  • the machine is equipped with a number of sensors which are in particular a thrust sensor 30 corresponding for example to the pressure of the hydraulic motor 26 causing the sinking of the drill string, by a sensor 32 mounted on the carriage 16 and supplying the penetration speed V p of the tool, into the ground, and of the sensors 34, 36 also mounted on the drilling head supplying the speed of rotation of the drill string V r , as well as the torque C applied to the drilling tool.
  • sensors which are in particular a thrust sensor 30 corresponding for example to the pressure of the hydraulic motor 26 causing the sinking of the drill string, by a sensor 32 mounted on the carriage 16 and supplying the penetration speed V p of the tool, into the ground, and of the sensors 34, 36 also mounted on the drilling head supplying the speed of rotation of the drill string V r , as well as the torque C applied to the drilling tool.
  • means represented schematically by 38 make it possible to determine the depth of the drilling tool 22.
  • These different sensors 30 to 38 are connected to a processing assembly 40 making it possible to control the execution of
  • the dynamic parameters of the drilling tool chosen are the thrust P, the torque C exerted by the tool, the speed of rotation V r of the tool and the penetration speed V p of the tool in the ground. It goes without saying that we would not depart from the invention if we used other dynamic parameters of the tool.
  • This processing unit 40 essentially comprises a central unit 42 built around a microprocessor, a data memory 44, a working memory 46 and a program memory 48.
  • the measurements provided by the sensors and transmitted in digital (or possibly analog) form in real time to the central unit 42 are stored in the data memory 44 by being associated with the depth at which these measurements have been made.
  • the depth is, for example, taken into account for steps of 1 cm.
  • the depth step of 1 cm can be implemented by memorizing the measurements corresponding to the successive depths detected by the depth sensor 38.
  • the time taken to drill 1 cm can be important.
  • the determination of successive depths in relation to the measurements of the parameters is therefore random.
  • measurements of the four parameters associated with a depth are stored in real time.
  • curves 4a to 4d show values of parameters P, C, V r and V p for different depths as they are recorded in real time.
  • the first variable C M is the variation of the average torque which represents the average value of the couple over a certain period. It is understood that, the lower this variable C M , the more constant the force necessary to drill the soil, that is to say the more the soil will have properties of homogeneous hardness.
  • a succession of the values of these variables corresponding to acceptable qualities of ground to constitute the anchoring of the piles is detected.
  • this criterion will be that this parameter is less than a first predetermined value V 1 .
  • the criterion will be that this variable is greater than a predetermined value V 2 .
  • the variables C M and S are calculated for each depth.
  • the subroutines necessary for these calculations are stored in the memory 48. These variables are calculated in the memory 46 and stored again in the data memory 44.
  • the central unit compares the values of the variables C M and S with the predetermined values V 1 and V 2 . If the two values of variables conform to the criteria retained for the depth considered, a counter 50 is incremented as shown in FIG. 3 after the comparison step 52. On the other hand, if one of the two criteria retained does not is not respected in step 52, the counter 50 is reset to zero by 54.
  • an anchoring depth in hard ground is determined in advance, which most often depends on the diameter of the borehole itself.
  • This anchoring depth L shown in Figure 4 can therefore be converted into a number of unit depth steps.
  • the counter 50 is incremented to a value corresponding to the number N of depth steps associated with the difference in depth L, which is detected in step 56, the bottom of the drilling actually carried out penetrates the required depth L into a soil hard. The drilling machine can then be stopped since the required anchoring conditions are met.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Civil Engineering (AREA)
  • Analytical Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Structural Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Paleontology (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
  • Earth Drilling (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
  • Piles And Underground Anchors (AREA)
  • Turning (AREA)

Claims (10)

  1. Verfahren zum Herstellen eines Bohrpfahls in einem harten Boden mit Hilfe einer Bohrmaschine, dadurch gekennzeichnet, dass es die folgenden Schritte umfasst:
    - die Bohrmaschine wird mit Fühlern zum Messen dynamischer Eigenschaften des Bohrwerkzeugs ausgestattet, die wenigstens einige der folgenden Eigenschaften enthalten: Drehmoment des Werkzeugs, Eindringgeschwindigkeit des Werkzeugs, Rotationsgeschwindigkeit des Werkzeugs, auf das Werkzeug ausgeübter Schub;
    - die durch die Fühler für aufeinanderfolgende, einem vorbestimmten Schritt entsprechende Tiefen vollzogenen Messungen werden entsprechend ihrer Erfassung gespeichert;
    - für jede Tiefe wird anhand der gespeicherten Messungen wenigstens eine erste, die Qualität des Bodens, auf den man aufgetroffen ist, darstellende Variable berechnet, und die aufeinanderfolgenden Werte der ersten Variablen für die aufeinanderfolgenden Tiefen werden entsprechend ihrer Berechnung gespeichert;
    - die aufeinanderfolgenden Werte der genannten Variablen werden verarbeitet, um unter den aufeinanderfolgenden Werten der Variablen für aufeinanderfolgende, einer vorbestimmten Tiefendifferenz entsprechende Tiefen eine im Wesentlichen fortlaufende Folge von Werten der Variablen zu suchen, die einer akzeptablen Bodenqualität entspricht; und
    - die Bohrung wird unterbrochen, wenn die im Wesentlichen fortlaufende Folge von annehmbaren Werten für die vorbestimmte Tiefendifferenz erfasst wurde.
  2. Verfahren zum Herstellen eines Bohrpfahls nach Anspruch 1, dadurch gekennzeichnet, dass:
    - für jede Tiefe anhand der gespeicherten Messungen eine zweite, die Qualität des Bodens, auf den man aufgetroffen ist, darstellende Variable berechnet wird, und dass die aufeinanderfolgenden Werte der zweiten Variablen für die aufeinanderfolgenden Tiefen gespeichert werden,
    - die aufeinanderfolgenden Werte der ersten und der zweiten Variablen verarbeitet werden, um in den aufeinanderfolgenden Werten einer jeden Variablen für aufeinanderfolgende, einer gleichen vorbestimmten Tiefendifferenz entsprechende Tiefen eine im Wesentlichen fortlaufende Folge von Werten einer jeden Variablen zu suchen, die einer annehmbaren Granitqualität entspricht;
    - die Bohrung unterbrochen wird, wenn die genannte im Wesentlichen fortlaufende Folge von annehmbaren Werten für die genannte gleiche vorbestimmte Tiefendifferenz erfasst wurde.
  3. Verfahren nach irgendeinem der Ansprüche 1 und 2, dadurch gekennzeichnet, dass der Messwert jedes Parameters dadurch berechnet wird, dass der Parameter in vorbestimmten Zeitintervallen gemessen wird und dass einer vorbestimmten Tiefe ein Parameterwert zugeordnet wird, der gleich dem Mittelwert der in den der genannten Tiefe entsprechenden Zeitintervallen durchgeführten Messungen ist.
  4. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass die erste Variable der gemittelte Wert des Drehmoments des Werkzeuges ist und dass die zweite Variable eine Funktion des Schubs, der Eindringgeschwindigkeit des Werkzeugs sowie der Rotationsgeschwindigkeit des Werkzeugs ist.
  5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass die zweite Variable anhand der folgenden Formel berechnet wird: P V r V P worin P der Schub, Vr die Rotationsgeschwindigkeit und VP die Eindringgeschwindigkeit ist.
  6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass der Wert der ersten Variablen als annehmbar betrachtet wird, wenn er unterhalb eines vorbestimmten Wertes liegt, und dass der Wert der zweiten Variablen als annehmbar betrachtet wird, wenn er oberhalb eines vorbestimmten Wertes liegt.
  7. Maschine zum Herstellen eines Bohrpfahls in einem harten Boden, mit einem Bohrwerkzeug, das am unteren Ende eines Bohrgestänges befestigt ist, sowie Mitteln zum Erzeugen der Rotation des Bohrgestänges und dessen Eintreiben in den Boden, dadurch gekennzeichnet, dass sie weiterhin folgendes aufweist:
    - Fühler zum Messen dynamischer Eigenschaften des Bohrwerkzeuges, die wenigstens einige der folgenden Eigenschaften enthalten: Drehmoment des Werkzeugs, Eindringgeschwindigkeit des Werkzeugs, Rotationsgeschwindigkeit des Werkzeugs, auf das Werkzeug ausgeübter Schub;
    - Mittel, um die durch die Fühler für aufeinanderfolgende, einem vorbestimmten Schritt entsprechende Tiefen vollzogenen Messungen entsprechend ihrer Erfassung zu speichern;
    - Mittel, um für jede Tiefe anhand der gespeicherten Messungen wenigstens eine erste, die Qualität des Bodens, auf den man aufgetroffen ist, darstellende Variable zu berechnen, sowie Mittel zum Speichern der aufeinanderfolgenden Werte der ersten Variablen für die aufeinanderfolgenden Tiefen entsprechend ihrer Berechnung;
    - Mittel zum Verarbeiten der aufeinanderfolgenden Werte der genannten Variablen, um unter den aufeinanderfolgenden Werten der Variablen für aufeinanderfolgende, einer vorbestimmten Tiefendifferenz entsprechende Tiefen eine im Wesentlichen fortlaufende Folge von Werten der Variablen zu suchen, die einer akzeptablen Bodenqualität entspricht; und
    - Mittel, um die Bohrung zu unterbrechen, wenn die im Wesentlichen fortlaufende Folge von annehmbaren Werten für die vorbestimmte Tiefendifferenz erfasst wurde.
  8. Maschine zum Herstellen eines Bohrpfahls nach Anspruch 7, dadurch gekennzeichnet, dass sie außerdem folgendes aufweist:
    - Mittel, um für jede Tiefe anhand der gespeicherten Messungen, eine zweite, die Qualität des Bodens, auf den man aufgetroffen ist, darstellende Variable zu berechnen, und um die aufeinanderfolgenden Werte der zweiten Variablen für die aufeinanderfolgenden Tiefen zu speichern,
    - Mittel zum Verarbeiten der aufeinanderfolgenden Werte der ersten und der zweiten Variablen, um in den aufeinanderfolgenden Werten einer jeden Variablen für aufeinanderfolgende, einer gleichen vorbestimmten Tiefendifferenz entsprechende Tiefen eine im Wesentlichen fortlaufende Folge von Werten einer jeden Variablen zu suchen, die einer annehmbaren Granitqualität entspricht; und
    - Mittel, um die Bohrung zu unterbrechen, wenn die genannte im Wesentlichen fortlaufende Folge von annehmbaren Werten für die genannte gleiche vorbestimmte Tiefendifferenz erfasst wurde.
  9. Maschine nach irgendeinem der Ansprüche 7 und 8, dadurch gekennzeichnet, dass der Messwert jedes Parameters dadurch berechnet wird, dass der Parameter in vorbestimmten Zeitintervallen gemessen wird und dass einer vorbestimmten Tiefe ein Parameterwert zugeordnet wird, der gleich dem Mittelwert der in den der genannten Tiefe entsprechenden Zeitintervallen durchgeführten Messungen ist.
  10. Maschine nach Anspruch 8, dadurch gekennzeichnet, dass die erste Variable der gemittelte Wert des Drehmoments des Werkzeugs ist und dass die zweite Variable eine Funktion des Schubs, der Eindringgeschwindigkeit des Werkzeugs und der Rotationsgeschwindigkeit des Werkzeugs ist.
EP02290128A 2001-02-01 2002-01-18 Verfahren und Einrichtung zur Herstellung von Bohrpfählen im harten Untergrund Expired - Lifetime EP1229172B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0101353A FR2820155B1 (fr) 2001-02-01 2001-02-01 Procede et machine pour la realisation de pieux fores en terrain dur
FR0101353 2001-02-01

Publications (2)

Publication Number Publication Date
EP1229172A1 EP1229172A1 (de) 2002-08-07
EP1229172B1 true EP1229172B1 (de) 2004-04-28

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EP02290128A Expired - Lifetime EP1229172B1 (de) 2001-02-01 2002-01-18 Verfahren und Einrichtung zur Herstellung von Bohrpfählen im harten Untergrund

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EP (1) EP1229172B1 (de)
JP (1) JP3830395B2 (de)
AT (1) ATE265582T1 (de)
DE (1) DE60200403D1 (de)
ES (1) ES2220877T3 (de)
FR (1) FR2820155B1 (de)
HK (1) HK1050227B (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4809708B2 (ja) * 2006-04-07 2011-11-09 日特建設株式会社 水力式ダウンザホールハンマーによるボーリング削孔時の地盤判定および割れ目判定方法および装置
DE502007000585D1 (de) * 2007-01-04 2009-05-20 Bauer Maschinen Gmbh Verfahren und Vorrichtung zum Erstellen einer Bohrung im Boden durch Verdrängerbohren
US20220412034A1 (en) * 2019-11-29 2022-12-29 Jammy Life Gmbh Method and apparatus for layer-by-layer filling and compacting cohesive building materials in layers in boreholes

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3886754A (en) * 1973-07-27 1975-06-03 Lee A Turzillo Method of extending augered pile cavity through rock or like obstruction
FR2647849B1 (fr) * 1989-05-31 1995-12-29 Soletanche Procede de caracterisation d'une couche de terrain
JPH06299531A (ja) * 1993-04-13 1994-10-25 Kokudo Kiso:Kk 支持地盤性状の測定方法及び装置
US6109368A (en) * 1996-03-25 2000-08-29 Dresser Industries, Inc. Method and system for predicting performance of a drilling system for a given formation

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Publication number Publication date
EP1229172A1 (de) 2002-08-07
ES2220877T3 (es) 2004-12-16
JP3830395B2 (ja) 2006-10-04
HK1050227B (zh) 2004-11-26
ATE265582T1 (de) 2004-05-15
FR2820155B1 (fr) 2003-04-25
DE60200403D1 (de) 2004-06-03
JP2002285781A (ja) 2002-10-03
HK1050227A1 (en) 2003-06-13
FR2820155A1 (fr) 2002-08-02

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