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WO1998013554A1 - Accroissement de la capacite portante destinee a des applications de formation de piles - Google Patents

Accroissement de la capacite portante destinee a des applications de formation de piles Download PDF

Info

Publication number
WO1998013554A1
WO1998013554A1 PCT/GB1997/002558 GB9702558W WO9813554A1 WO 1998013554 A1 WO1998013554 A1 WO 1998013554A1 GB 9702558 W GB9702558 W GB 9702558W WO 9813554 A1 WO9813554 A1 WO 9813554A1
Authority
WO
WIPO (PCT)
Prior art keywords
auger
retractable element
flight
flights
concrete
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.)
Ceased
Application number
PCT/GB1997/002558
Other languages
English (en)
Inventor
Melvin Gerrard England
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.)
Cementation Skanska Ltd
Original Assignee
Kvaerner Cementation Foundations Ltd
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 Kvaerner Cementation Foundations Ltd filed Critical Kvaerner Cementation Foundations Ltd
Priority to AU43119/97A priority Critical patent/AU4311997A/en
Publication of WO1998013554A1 publication Critical patent/WO1998013554A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • E02D5/22—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
    • 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
    • E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
    • E21B10/32—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
    • 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
    • E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
    • E02D5/44—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds with enlarged footing or enlargements at the bottom of the pile
    • 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

Definitions

  • the present invention relates to a tool for enhancing the bearing capacity of a pile, in particular but not exclusively the bearing capacity of a rotary- bored pile and/or a pile formed by a continuous flight auger .
  • a continuous flight piling auger wherein the auger includes at least one retractable element which may be extended so as to project beyond the circumference of the flight or flights of the auger, characterised in that the at least one retractable element is located in a circumferential part of the auger flight or flights .
  • a method of installing a pile using a continuous flight auger wherein: i) the auger is rotated and allowed to penetrate the ground to a predetermined depth so as to define a bore hole ; ii) a retractable element located on a circumferential part of the auger flight or flights is extended so as to project beyond the circumference of the flight or flights of the auger and thereby to cut or displace a region of soil surrounding the rotating auger so as to form a void; and iii) the auger is withdrawn while concrete is supplied to the tip of the auger so as to fill the bore hole and the void.
  • the continuous flight auger of the present invention can be used in the conventional manner to form a bore hole in cohesive or non-cohesive material.
  • the at least one retractable element when the at least one retractable element is in its retracted position, it offers little or no resistance during penetration of the auger.
  • the at least one retractable element may be extended beyond the circumference of the auger flight or flights so as to cut into or displace a portion of the material surrounding the auger as the auger continues to rotate.
  • the at least one retractable element may then be returned to a position within the circumference of the auger flight or flights.
  • material which has been cut by the at least one element may be drawn onto the auger flight or flights for removal.
  • the auger may then be withdrawn from the ground while concrete or the like is pumped into the bore hole, e.g. through the centre of the auger, so as to form a pile.
  • an additional concrete delivery system may be associated with the at least one retractable element so as to supply concrete directly to the void left by the cut or displaced material. This can help to avoid swelling or collapse of the void, and is particularly useful when a number of cuts or displacements are made during penetration of the auger .
  • the auger may be rotated during withdrawal and the at least one retractable element may be operated at so as make cuts or displacements at predetermined positions, the voids being filled with concrete by means of the main concrete supply.
  • the at least one retractable element is located on the circumference of the auger flight or flights, may extend across two or more flights, and may be located at any point along the length of the auger.
  • a single retractable element which is shaped so as to displace material when it is in its extended position.
  • the element is advantageously located at the bottom of the auger, but may be located at other positions if it has an associated additional concrete delivery system.
  • the element is kept in a retracted position during penetration of the auger. Upon withdrawal, the element is extended and the auger rotated. As the auger is withdrawn and concrete is pumped to the tip of the auger so as to form a pile in the bore hole, the element will form a helical void in the surrounding material and the void, as well as the main shaft of the bore hole, will be filled with concrete.
  • a conventional pile of 600mm diameter and 27m in length will have a shaft friction in a cohesive clay soil of 4165kN and an end bearing of 787kN, giving a total capacity of 4952kN.
  • a similar pile 20m in length will have a shaft friction of 2360kN and an end bearing of 606kN, giving a total capacity of 2966kN.
  • a 20m pile of normal diameter 600mm but with an enhanced diameter of 1200mm in a region 2m above its base will theoretically have a shaft friction of 2360kN and an end bearing of 1661kN plus 606kN, giving a total bearing capacity of 4627kN. It has been found in practice that the shaft friction is 3225kN and the end bearing 1820kN, giving a total of 5045kN.
  • FIGURE 1 shows a piling rig fitted with a continuous flight auger
  • FIGURE 2 shows a detail of an auger flight.
  • FIGURE 3 shows the profile of the bottom of a pile installed by one embodiment of the present invention.
  • FIGURE 4 shows the profile of the bottom of a pile installed by another embodiment of the present invention.
  • Figure 1 shows a piling rig 1 upon which a continuous flight auger 2 is mounted. Concrete can be supplied to the tip 3 of the auger 2 by way of a pipeline 4.
  • the auger 2 includes a flight 5 which, as well as helping the auger 2 to penetrate the ground, also serves to remove soil from the bore hole which is to be formed.
  • a retractable element 6, shown in more detail in Figure 2 is provided at the edge of the flight 5 near the bottom of the auger 2. This retractable element 6 is movable between its retracted position and an extended position, indicated by way of broken lines in Figure 2, in which position it projects beyond the circumference of the flight 5 of the auger 2.
  • the auger 2 is rotated and allowed to penetrate the ground to a predetermined depth. Normally, the rate of rotation and the rate of penetration are controlled so that there is some degree of shearing between the soil on the auger flight 5 and the soil 11 surrounding the auger 2.
  • the retractable element 6 is moved to its extended position (shown by broken lines in Figure 2) and the auger is rotated. In some embodiments, the soil 11 surrounding the auger 2 at this point is thereby displaced so as to create a generally annular void.
  • the retractable element 6 may be shaped and positioned to as to cut into the soil upon extension, the cut soil then being carried away up the auger flight 5 when the element 6 is retracted.
  • the element 6 is retracted and the auger 2 is withdrawn from the ground.
  • concrete is pumped to the tip 3 of the auger 2 by way of pipeline 4 and the hollow stem 14 of the auger 2.
  • This concrete fills up the bore hole, including the void, so as to form a pile 7, the bottom part of which is shown in profile in Figure 3.
  • concrete may be delivered directly to the void by way of an opening 15 located on the retractable element 6 and communicating with the hollow stem 14 of the auger 2. This can help to avoid premature collapse of the void.
  • the shape of the pile 7 in the region 8 of enhanced diameter is dependent upon the particular retractable element used. Either or both the lower surface 12 as and the upper surface 13 may be straight, concave or convex, or any other shape. In the particular embodiment shown, the region 8 is 2m from the base of the pile 7.
  • FIG. 4 An alternative pile 9 is shown in profile in Figure 4.
  • This pile 9 has a projection 10 which describes a helix about the axis of the pile, and acts as a region of enhanced diameter.
  • the projection 10 is formed by progressing the auger 2 to the required depth, moving the element 6 into its extended position, and rotating the auger 2 as it is withdrawn. Concrete is pumped to the tip 3 of the auger during withdrawal so as to fill the bore hole and also to fill the surrounding helical void as it is being created by way of the displacement of soil by the element 6.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Structural Engineering (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)
  • Piles And Underground Anchors (AREA)
  • Earth Drilling (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

Cette tarière à spire continue (2), destinée à la formation de piles, comprend un élément rétractable (6) qui peut s'étendre au-delà de la circonférence de la spire (5) de la tarière (2). Lors de son utilisation, la tarière (2) tourne et pénètre dans le sol de manière à y déterminer un trou de forage, et l'élément rétractable (6) s'étend de manière à couper ou déplacer une région de sol (11) entourant la tarière (2), formant ainsi un vide; on retire alors la tarière (2) tandis que l'on alimente du béton vers le bout (3) de celle-ci, de manière à remplir le trou de forage et le vide. La pile résultante (7, 9) présente une capacité portante accrue due à son diamètre qui est plus grand dans les régions (8, 10) où le sol a été coupé ou déplacé au moyen de l'élément rétractable (6).
PCT/GB1997/002558 1996-09-26 1997-09-22 Accroissement de la capacite portante destinee a des applications de formation de piles Ceased WO1998013554A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU43119/97A AU4311997A (en) 1996-09-26 1997-09-22 Bearing capacity enhancement for piling applications

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9620251.0 1996-09-26
GBGB9620251.0A GB9620251D0 (en) 1996-09-26 1996-09-26 Bearing capacity enhancement for piling applications

Publications (1)

Publication Number Publication Date
WO1998013554A1 true WO1998013554A1 (fr) 1998-04-02

Family

ID=10800641

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1997/002558 Ceased WO1998013554A1 (fr) 1996-09-26 1997-09-22 Accroissement de la capacite portante destinee a des applications de formation de piles

Country Status (4)

Country Link
AU (1) AU4311997A (fr)
GB (2) GB9620251D0 (fr)
TW (1) TW353689B (fr)
WO (1) WO1998013554A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000061877A1 (fr) 1999-04-09 2000-10-19 Cementation Foundations Skanska Limited Augmentation de la capacite portante lors de la realisation de piles
US7226246B2 (en) 2000-06-15 2007-06-05 Geotechnical Reinforcement, Inc. Apparatus and method for building support piers from one or successive lifts formed in a soil matrix
US9169611B2 (en) 2000-06-15 2015-10-27 Geopier Foundation Company, Inc. Method and apparatus for building support piers from one or more successive lifts formed in a soil matrix

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2377235A (en) * 2001-07-17 2003-01-08 Cie Du Sol Drilling tool
GB2400869B (en) * 2003-04-22 2006-11-15 Cie Du Sol Threading equipment
EP1625258A1 (fr) * 2003-05-15 2006-02-15 Wilson, Clive Procede de construction de pieux
GB2440939B (en) * 2006-04-18 2009-08-05 Cie Du Sol Cutting head provided with threading means
PL1748108T3 (pl) 2005-07-28 2011-03-31 Soletanche Freyssinet Świder z występem ruchomym dla wykonywania wiercenia
FR2889241B1 (fr) * 2005-07-28 2013-05-17 Cie Du Sol Tariere a ergot mobile

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1391110A (en) * 1972-09-11 1975-04-16 Turzillo L A Methods and means for producing pile or like structural columns in situ
AU586947B2 (en) * 1987-03-09 1989-07-27 Catawa Pty Ltd Improvements in piles and ground drills
JPH01295913A (ja) * 1988-05-24 1989-11-29 Tousen Asano Paul Kk 大口径杭の拡大球根構築方法およびその装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3938344A (en) * 1974-04-29 1976-02-17 Kabushiki Kaisha Takechi Koumusho Earth auger and method for driving piles and the like by means of said earth auger
DE2709030C2 (de) * 1977-03-02 1985-05-15 Stahl- Und Apparatebau Hans Leffer Gmbh, 6602 Dudweiler Drehbohrkrone mit Schwenkflügeln
WO1990002243A1 (fr) * 1988-08-29 1990-03-08 Catawa Pty. Ltd. Forets pour pilots et pour la stabilisation du sol
WO1994002687A1 (fr) * 1992-07-24 1994-02-03 Wagstaff Piling Pty. Ltd. Appareil et procede pour former des pieux en beton

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1391110A (en) * 1972-09-11 1975-04-16 Turzillo L A Methods and means for producing pile or like structural columns in situ
AU586947B2 (en) * 1987-03-09 1989-07-27 Catawa Pty Ltd Improvements in piles and ground drills
JPH01295913A (ja) * 1988-05-24 1989-11-29 Tousen Asano Paul Kk 大口径杭の拡大球根構築方法およびその装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 14, no. 81 (M - 0935) 15 February 1990 (1990-02-15) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000061877A1 (fr) 1999-04-09 2000-10-19 Cementation Foundations Skanska Limited Augmentation de la capacite portante lors de la realisation de piles
US7226246B2 (en) 2000-06-15 2007-06-05 Geotechnical Reinforcement, Inc. Apparatus and method for building support piers from one or successive lifts formed in a soil matrix
US9169611B2 (en) 2000-06-15 2015-10-27 Geopier Foundation Company, Inc. Method and apparatus for building support piers from one or more successive lifts formed in a soil matrix

Also Published As

Publication number Publication date
GB2316700B (en) 1998-07-22
GB2316700A (en) 1998-03-04
TW353689B (en) 1999-03-01
AU4311997A (en) 1998-04-17
GB9720142D0 (en) 1997-11-26
GB9620251D0 (en) 1996-11-13

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