EP0131562B1 - Verfahren zum Einbringen von Pfählen mit Anwendung einer Verdrängungsschraube - Google Patents

Verfahren zum Einbringen von Pfählen mit Anwendung einer Verdrängungsschraube Download PDF

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Publication number
EP0131562B1
EP0131562B1 EP19840870097 EP84870097A EP0131562B1 EP 0131562 B1 EP0131562 B1 EP 0131562B1 EP 19840870097 EP19840870097 EP 19840870097 EP 84870097 A EP84870097 A EP 84870097A EP 0131562 B1 EP0131562 B1 EP 0131562B1
Authority
EP
European Patent Office
Prior art keywords
tube
screw
pile
drilling head
drilling
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.)
Expired
Application number
EP19840870097
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English (en)
French (fr)
Other versions
EP0131562A1 (de
Inventor
Roger Labyt
Robert Imbo
Jean-Pierre Van Steenberge
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.)
ATLAS PALEN NV
Original Assignee
ATLAS PALEN NV
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
Priority claimed from BE0/211135A external-priority patent/BE897242A/nl
Application filed by ATLAS PALEN NV filed Critical ATLAS PALEN NV
Publication of EP0131562A1 publication Critical patent/EP0131562A1/de
Application granted granted Critical
Publication of EP0131562B1 publication Critical patent/EP0131562B1/de
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Classifications

    • 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
    • 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 a method for sinking by means of a discharge screw, concrete piles molded into the ground and provided with an enlarged seat.
  • a device for making a foundation stake in a laterally repressible soil is already known from Belgian Patent No. 747,807.
  • Screw piles are shaped using a steel tube, provided at the base with a drilling tool. This is screwed into the ground using a drilling table comprising a pushing mechanism which drives down the steel tube.
  • the soil is compressed laterally by the screw so that (from the point of view of soil mechanics, these piles are entirely identical to beaten piles formed in the ground) an area of compacted ground forms around the pile, comparable to what happens with the piles molded into the ground. With the screw pile, the soil is not moved but only compressed laterally.
  • the concrete slides, under the effect of static pressure and / or the force of gravity, into the formed cavity which regularly fills with reinforced concrete.
  • a helical flange is welded to the screw; this flange therefore only serves to provide the drilling crew with the necessary vertical reaction.
  • the helical shape gives the pile a higher resistance to friction, but due to the too small thickness (taken into account when calculating the useful range on the bearing layer) of the screw formed in the ground, we do not hold not take into account the helical shape for the dimensioning of the load limit by lateral friction. Hitherto, only the diameter of the pile shaft (without screws) has been taken into account for the calculation of the lift by lateral friction.
  • the present invention aims to deeply improve the above embodiment. It makes it possible to produce a screw pile having better resistance to friction and, consequently, a higher breaking load.
  • the invention relates to a method for producing a screw pile in the ground by means of an assembly consisting of a tube and a drilling head comprising a helical screw, the diameter of said drilling head increasing up to to the desired diameter of the pile shaft.
  • a solid helix-shaped flange is welded on a revolution.
  • the screw is provided with a free drilling point provided with unidirectional stops, which is screwed to the required depth, using a rotation table with pressure mechanism.
  • a characteristic feature consists in applying to the above-mentioned crew, when screwing up, a sufficient tensile force to make the upward displacement of the tube greater than that resulting from the rotation of the tube, taking into account of the screw pitch.
  • An essential and different feature of the other embodiments consists in unscrewing the drilling head provided with a thread by applying said tensile force. There appears a free space in the shape of a helix, which has a section such that it can be taken into account for the calculation of the payload limit.
  • Screw piles are concrete piles molded into the ground, made by pouring concrete into a borehole, obtained by a discharge screw.
  • the discharge screw which is designated as a whole by the reference notation 1, comprises an assembly consisting of a steel tube 2 and a drilling head 3.
  • the tube is made up of various steel tube elements which each have a length of 6 m for example.
  • the tube elements are interconnected by identical coupling members.
  • the drill head is a piece of cast iron and manganese steel with a helical shape whose diameter increases in a spiral to a diameter equal to the desired diameter of the pile.
  • a 51st propeller was welded along a revolution.
  • This propeller 5 is made of manganese steel.
  • the drilling head 3 has at its lower part a free drilling point 6.
  • the drilling point 6 is made of cast iron. During drilling, it forms the seal of the injection tube 2. This point 6 is driven by two unidirectional stops 7 in a direction of rotation. During unscrewing, the tip remains abandoned in the ground. The point has a cross section 8. Other forms are also possible.
  • the steel injection tube 2 is screwed into the ground by rotation about its median axis LL 'using a rotary drive mechanism or rotation table 9 and under the influence of a pressure mechanism 10.
  • the drive mechanism 9 comprises in the example chosen, four hydraulic motors 11 and a set of gears which actuates a drum 13.
  • the rotational movement is transmitted to the injection tube by means of continuous tongues 14 made of steel by rings with heavy rollers 16.
  • the rings are joined together using pins 17 made of steel. In the event of wear, a ring can easily be replaced.
  • the rotary drum 13 rests on the rotary table by means of thrust roller bearings.
  • the housing 20 of the rotary table with the cover 21 above forms a fixed part of the machine and is fixed with nuts 22 to the frame 19.
  • the pressure mechanism 10 consists of two thrust bearings 23, 24 which are both actuated by two main hydraulic cylinders 25, 26 upwards and downwards.
  • the thrust bearings 23, 24 can communicate various combinations of movement to the injection tube 2. By driving in turn, the injection tube 2, either up or down, they impart a translational movement continuous to tube 2.
  • the unsolicited thrust bearing returns at high speed to the starting point. Due to the fact that a rotational movement around the center line of the discharge screw is transmitted simultaneously, the drilling head 3 also moves continuously like a helix in the ground.
  • the thrust bearings 23, 24 can, if necessary, work together periodically.
  • a periodic translation with double power is recommended for example for drilling hard layers of ground; but this double power is above all necessary at the start of the withdrawal of the drilling head; it is necessary at this moment, in fact, to exert a very significant traction on the tube in order to form an enlarged seat and the initial helical shape.
  • At least three steel guide rods 29 guide the translational movement of each thrust bearing 23, 24.
  • the hydraulic cylinders 25, 26 are fixed at their upper part to the thrust bearings 23, 24 and at their lower part at chassis 19 by means of spherical hinges 30. This avoids bending stresses in the jacks.
  • connection of the thrust bearings 23, 24 with the tube 2 is carried out using spring pawls 31, 32 which are supported on a discontinuous tab of the injection tube.
  • Each spring pawl 31, 32 has a very hard steel nose which is pushed into an opening 36 of the discontinuous tongue by a spring 35.
  • the flat gives the translational movement of the jack 25, 26 to the drill pipe.
  • the oblique part slides on the discontinuous steel tongue.
  • Each pawl 31, 32 can be turned over in a jiffy, a half turn or a quarter turn, to modify the position and therefore the operation.
  • the tube 2 is actuated by a rotating drum 13 and by the two thrust bearings 23, 24 moved downwards, at the same time or in turn, until the required resistance or depth is reached .
  • a steel frame 37 is optionally brought into the injection tube.
  • the drill hole formed immediately fills with concrete under high static pressure, while the steel frame 37 remains in place in the ground.
  • the width and thickness of the propeller section are determined by the adjustment of the tensile force so that they can be taken into account for the calculation of the pile payload.
  • the payload of a screw pile is determined by the admissible soil stress under the base of the pile and the lateral friction resistance to be taken into account.
  • the surface of the pile base and the lateral surface are determined from the outside diameter of the screw pile made.
  • the payload is limited by the admissible stress of the concrete in the pile of the pile.
  • the steel frame can vary according to the stress or the prescriptions. It can be installed over the total length of the pile, which can include more than 20 m. In many cases, a 4 or 6 m head reinforcement is sufficient, which can be placed in fresh concrete after the pile has been made.
  • the piles can also be made obliquely.

Landscapes

  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Piles And Underground Anchors (AREA)

Claims (3)

1. Verfahren zum Einbringen eines Pfahles mit Schraubgewinde in den Erdboden mittels einer Vorrichtung, die aus einem Rohr (2) und einem mit einem schneckenförmigen Gewinde versehenen Bohrkopf (3) besteht, dessen Durchmesser sich bis zu dem gewünschten Durchmesser des Schaftes des Pfahles vergrössert und der eine lose Bohrspitze (6) mit einseitig ausgerichteten Anschlägen (7) enthält, wobei der Bohrkopf mit Hilfe eines Drehtisches (9), der mit einem Mechanismus (10) zum Aufbringen eines Druckes ausgerüstet ist, bis zu der vorgesehenen Tiefe in den Boden eingeschraubt wird, dadurch gekennzeichnet, dass auf die Vorrichtung während sie durch Herausschrauben nach oben bewegt wird, eine Zugkraft ausgeübt wird, die ausreicht, um eine Verschiebung des Rohres nach oben zu bewirken, die grösser ist als die, die sich aus der Drehung des Bohrkopfes unter Berücksichtigung der Ganghöhe der Schraube ergibt, so dass ein freier Raum in Form einer Wendel gebildet wird, der einen Querschnitt aufweist, der für die Berechnung der Nutzlast in Betracht kommen kann.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass man die Verdrängungsschraube während des Herausschraubens bei jeder Umdrehung mit einer grossen Kraft um eine Strecke nach oben zieht, die gleich der Summe der Ganghöhe der Schraube und einer vorbestimmten Ganghöhendifferenz ist, so dass sich ein freier wendelförmiger Raum ergibt, dessen Höhe gleich der Summe der Stärke des Gewindeflansches und der Ganghöhendifferenz ist und der sich sofort mit Beton füllt.
3. Verfahren nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, dass man die Pfähle geneigt einsetzt.
EP19840870097 1983-07-07 1984-07-09 Verfahren zum Einbringen von Pfählen mit Anwendung einer Verdrängungsschraube Expired EP0131562B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE0/211135A BE897242A (nl) 1983-07-07 1983-07-07 Inrichting voor het trillingvrij aanbrengen van funderingspalen uit gewapend beton
BE211135 1983-07-07

Publications (2)

Publication Number Publication Date
EP0131562A1 EP0131562A1 (de) 1985-01-16
EP0131562B1 true EP0131562B1 (de) 1986-12-10

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ID=3843662

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840870097 Expired EP0131562B1 (de) 1983-07-07 1984-07-09 Verfahren zum Einbringen von Pfählen mit Anwendung einer Verdrängungsschraube

Country Status (2)

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EP (1) EP0131562B1 (de)
DE (1) DE3461663D1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU585755B2 (en) * 1987-07-10 1989-06-22 Frankipile Australia Pty. Limited Method and apparatus for boring piles
BE1010781A3 (nl) * 1996-12-03 1999-01-05 Coelus Gaspar Jozef Grondverdringende schroefboor en werkwijze voor het vervaardigen van een betonpaal hiermee.
FR2806110B1 (fr) 2000-03-10 2002-12-27 Cie Du Sol Appareil d'excavation pour la realisation de pieux moules

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1532569A (fr) * 1967-05-31 1968-07-12 Perfectionnements aux dispositifs destinés au fonçage des pieux à vis
US3422629A (en) * 1967-09-06 1969-01-21 James P Watts Construction support system and methods and apparatus for construction thereof
FR2475617A1 (fr) * 1980-02-07 1981-08-14 Coelus Gaspar Trepan a compression, a plaque de fermeture plane

Also Published As

Publication number Publication date
DE3461663D1 (en) 1987-01-22
EP0131562A1 (de) 1985-01-16

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