EP1045073A1 - Outil d'excavation et procédé de fabrication d'une colonne en sol consolidée - Google Patents

Outil d'excavation et procédé de fabrication d'une colonne en sol consolidée Download PDF

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Publication number
EP1045073A1
EP1045073A1 EP00107737A EP00107737A EP1045073A1 EP 1045073 A1 EP1045073 A1 EP 1045073A1 EP 00107737 A EP00107737 A EP 00107737A EP 00107737 A EP00107737 A EP 00107737A EP 1045073 A1 EP1045073 A1 EP 1045073A1
Authority
EP
European Patent Office
Prior art keywords
nozzle means
excavation tool
blade element
tool according
shaft
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.)
Withdrawn
Application number
EP00107737A
Other languages
German (de)
English (en)
Inventor
Federico Pagliacci
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.)
Trevi SpA
Original Assignee
Trevi SpA
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 Trevi SpA filed Critical Trevi SpA
Publication of EP1045073A1 publication Critical patent/EP1045073A1/fr
Withdrawn legal-status Critical Current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
    • E02D5/22—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
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
    • E02D3/126—Consolidating by placing solidifying or pore-filling substances in the soil and mixing by rotating blades
    • 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
    • E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2250/00—Production methods
    • E02D2250/003—Injection of material
    • 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
    • E02D7/24—Placing by using fluid jets

Definitions

  • the present invention relates to an excavation tool of the type defined in the preamble to Claim 1; the invention also relates to a method for forming a column of consolidated soil.
  • an excavation tool 10 includes a tubular shaft 11 with members 12 at its lower end for breaking the ground; above these, the tool has a pair of opposing blades 13 which extend radially from the shaft 11 and are arranged at opposite angles of inclination.
  • the particles of soil broken up by the teeth 13a of the blades are mixed with a cementing mixture pumped at low pressure (1-2 MPa) through apertures 14 in the tubular shaft 11 just below the blades.
  • the angular orientation of the blades enables the tool to be screwed into the ground during the digging step; rotation of the tool in the opposite sense during the extraction step, pushes treated soil downwards so as to compact it in the borehole, thereby reducing the percentage of voids.
  • jet grouting In a second conventional method, known as jet grouting, (see Figure 2) mixing depends exclusively on the kinetic energy of a consolidating fluid which is pumped at high pressure (15-40 MPa) through small radial nozzles 15 formed in the tubular shaft 11 proximate to the lower end of the tool so as to produce high-speed and high-kinetic energy jets 16.
  • the radius of action of the jets, which are perpendicular to the shaft 11, is limited and affected by the nature of the ground, whereby the diameter of the column of consolidated ground obtained by this method is neither constant nor predictable.
  • a third method makes use of a tool 16 which includes a tubular shaft 11 and one or more helical blades 17 with ground-breaking teeth 17a on their lower ends.
  • One or more radial ducts 18 extend from the shaft 11, substantially aligned in respective vertical axial planes with the end portions of the helical blades bearing the teeth 17a.
  • the ducts 18 are securely fixed to the helical blades, communicate with the interior of the shaft and have a plurality of nozzles 19 though which jets of a pressurized concrete mixture are injected at high speed into the ground, already partially broken down by the mechanical action of the lower ends of the helical blades and possibly by the ground-breaking members 12.
  • high pressure generally around 10-20 MPa, the jets are finely mixed into the broken soil, thus obtaining a consolidated column with a constant diameter.
  • the object of the present invention is to provide an excavation tool of an advanced type which makes it possible further to reduce friction between the tool and the ground and enables work to be carried out at even greater speeds than those achieved with prior art tools.
  • Another object of the invention is to provide a high-yield method which makes it possible to cut the working time and operating cost of the equipment used to dig and form columns of consolidated soil.
  • this further object is achieved by providing a method as claimed in Claim 16.
  • a tool according to the present invention is generally indicated 20.
  • the tool 20 includes a central tubular shaft 21 having securely attached thereto a plurality of, in this case two, angularly spaced ground-breaking helical blades 22 which extend radially from the shaft 21.
  • the tool 20 can be fixed to an upper drive transmission shaft 23 so as to carry out a combined movement of vertical translation and rotation about the longitudinal axis x of the shaft 21.
  • the tool 20 and the shaft 23 are releasably coupled, preferably by means of a splined coupling 24a, 24b (see Figure 4) or a form coupling device 25a, 25b (see figure 5) with the addition of axial retaining means such as pins 26 which are inserted through holes 27 in the shaft 21 so as to engage corresponding seats 28 formed in the shaft 23.
  • a form coupling of this type locks the tool to the transmission shaft for rotation in both senses about the axis x, as will be explained in greater detail below.
  • the tool has radial ducts 30 communicating with a central axial cavity 21a in the shaft, through which a concrete mixture is fed under pressure; the ducts 30 are secured to the lower surfaces 31 of the helical blades 22, or the rear surfaces thereof with reference to the sense of rotation during excavation.
  • each duct 30 has a plurality of nozzles 32 distributed along the length of the lower edge 29 of each helical blades, which eject jets 33 of pressurized consolidating mixture at high speed.
  • the lower nozzles 32 are orientated substantially axially or slightly inclined to the vertical, so as to direct the jets 33 directly onto the unbroken ground at the bottom of the excavation 34, in such a way that it is at least partly broken up by the jets before it is engaged by the lower edges 29 of the helical blades, which break it up further and remove the soil encountered in their movement.
  • the bottom of the excavation is broken up by the vertical jets 33 to a depth which varies between around 20 and around 40 centimetres. It is advantageous for the pressure of the jet to be of the order of 30-40 MPa so as to achieve optimum performance of the tool.
  • Further nozzles 35 are preferably arranged on the bottom of the tubular shaft 21, directed downwards and associated with breaking members 36.
  • the present invention makes it possible to reduce the boring torque applied to the tool or, at equal torque, to achieve a greater penetration speed when compared to methods discussed in the introduction to this description.
  • a splined or form coupling between the tool and the drive transmission shaft is preferable to a threaded coupling which could allow the tool to become unscrewed accidentally during rotation in one sense or the other.
  • inclined nozzles 37 directed upwardly and outwardly, are arranged near the shaft 21 for producing jets 38 which pass through apertures 39 in the helical blades, thereby further fluidising and breaking down the excavation material which is rising along the upper or front surfaces 40 of the helical blades.
  • nozzles 41 can be provided on the shaft 21 in addition to or as an alternative to the inclined nozzles 37, directed radially outwards, preferably arranged on a slightly lower level than that of the vertical nozzles 32 and angularly offset relative to the radial ducts 30.
  • the nozzles 41 produce radial jets 42 which interfere with the downwardly directed axial jets 33, thereby producing vortex motion flow patterns as shown schematically at 43 which encourage the homogeneous breaking down of the soil.
  • the soil particles moved by the mixture jets 33 and 42 are first pushed downwards and outwards and then are forced by the surrounding soil to return upwards and inwards.
  • the excavation tool 20 can have one or more pairs of oppositely inclined radial blades 44, in concordance with the volutes of the helical blades.
  • the pairs of radial blades 44 arranged above the helical blades 22 and preferably axially spaced according to the pitch of the latter, have further radial ducts with axial nozzles 45 directed downwards and, optionally, nozzles 46 directed upwards and acting to supply vertical jets 47 which prolong the breaking down of the soil above the helical blades.
  • the vertical jets 47 can either be jets of pressurized concrete mixture or, in a possible variant to the invention shown in Figure 8, jets of the mixture 47 combined with jets of compressed air 48.
  • each jet of mixture 47 is surrounded by a tubular jet of compressed air 48 by providing an inner duct 49 which ejects the mixture through a nozzle 45 and an outer duct 50 which supplies compressed air and ejects it through an air nozzle 51 coaxial to the mixture nozzle 45.
EP00107737A 1999-04-15 2000-04-11 Outil d'excavation et procédé de fabrication d'une colonne en sol consolidée Withdrawn EP1045073A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTP990301 1999-04-15
ITTP990301 1999-04-15

Publications (1)

Publication Number Publication Date
EP1045073A1 true EP1045073A1 (fr) 2000-10-18

Family

ID=11418443

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00107737A Withdrawn EP1045073A1 (fr) 1999-04-15 2000-04-11 Outil d'excavation et procédé de fabrication d'une colonne en sol consolidée

Country Status (1)

Country Link
EP (1) EP1045073A1 (fr)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003033825A1 (fr) * 2001-10-12 2003-04-24 Tracto-Technik Gmbh Procede et dispositif de stabilisation du sol
EP1418277A1 (fr) * 2002-11-06 2004-05-12 Chiaverotti BVBA Procédé de construction d'un mur de soutènement
EP1600560A1 (fr) * 2004-05-28 2005-11-30 Smet F & C Procede et disposotif pour réaliser un pieu de fondation
EP1748110A2 (fr) 2005-07-22 2007-01-31 SOILMEC S.p.A. Procédé et appareil de mélange du sol pour la réalisation de parois moulées
EP1961867A2 (fr) * 2007-02-22 2008-08-27 Trevi S.p.A. Procédé de construction de structure souterraine monolithique en béton
US7455479B2 (en) 2005-07-14 2008-11-25 Joseph Kauschinger Methods and systems for monitoring pressure during jet grouting
WO2010095153A1 (fr) * 2009-02-20 2010-08-26 Soilmec S.P.A. Equipement de jet grouting
CN101876170A (zh) * 2009-03-30 2010-11-03 疏浚国际股份有限公司 用于稳定基本上由淤泥和/或相关材料组成的土壤的方法及装置
GB2489085A (en) * 2011-03-15 2012-09-19 Brian Peter Dunn Cutting tool for repairing pot holes by creating a circular area of repair in damaged road
EP2535461A1 (fr) 2011-06-16 2012-12-19 Keller Holding gmbh Procédé et dispositif de fabrication d'éléments de sol
CN103205968A (zh) * 2012-01-11 2013-07-17 特雷维有限责任公司 用于将待固结加压流体混合物喷射到地下的喷射头
EP2728071A1 (fr) 2012-11-05 2014-05-07 Keller Holding GmbH Procédé et dispositif de fabrication d'éléments de sol formant une paroi
EP2730702A1 (fr) * 2012-10-31 2014-05-14 Keller Holding GmbH Procédé et dispositif de fabrication de dépôts parallèles au moyen d'outils à jet
JP2014118669A (ja) * 2012-12-12 2014-06-30 Ryoji Watabe 基礎杭とその施工方法
JP2016075058A (ja) * 2014-10-06 2016-05-12 三和機材株式会社 地盤改良装置および地盤改良方法
JP2016176214A (ja) * 2015-03-19 2016-10-06 株式会社不動テトラ 地盤攪拌装置
BE1024948B1 (nl) * 2018-03-23 2018-08-23 Injectis Bvba Werkwijze en inrichting voor het behandelen van een bodem
EP3361040B1 (fr) * 2017-02-13 2019-11-27 BAUER Maschinen GmbH Outil de traitement de sol et procédé de production d'un trou dans le sol

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4958962A (en) 1989-06-28 1990-09-25 Halliburton Company Methods of modifying the structural integrity of subterranean earth situs
EP0436954A1 (fr) * 1990-01-11 1991-07-17 Seiko Kogyo Kabushiki Kaisha Machine de forage et de malaxage à double tube et méthode d'amélioration d'un sol de fondation utilisant ladite machine de forage et de malaxage à double tube
EP0453839A2 (fr) * 1990-04-26 1991-10-30 Millgard Environmental Corporation Foreuse montée sur grue et procédé pour le traitement in-situ de sol contaminé
US5396964A (en) 1992-10-01 1995-03-14 Halliburton Company Apparatus and method for processing soil in a subterranean earth situs
US5814147A (en) * 1997-01-21 1998-09-29 Envirotrench Company Method for strengthening and improving clay soils

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4958962A (en) 1989-06-28 1990-09-25 Halliburton Company Methods of modifying the structural integrity of subterranean earth situs
EP0436954A1 (fr) * 1990-01-11 1991-07-17 Seiko Kogyo Kabushiki Kaisha Machine de forage et de malaxage à double tube et méthode d'amélioration d'un sol de fondation utilisant ladite machine de forage et de malaxage à double tube
EP0453839A2 (fr) * 1990-04-26 1991-10-30 Millgard Environmental Corporation Foreuse montée sur grue et procédé pour le traitement in-situ de sol contaminé
US5396964A (en) 1992-10-01 1995-03-14 Halliburton Company Apparatus and method for processing soil in a subterranean earth situs
US5814147A (en) * 1997-01-21 1998-09-29 Envirotrench Company Method for strengthening and improving clay soils

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003033825A1 (fr) * 2001-10-12 2003-04-24 Tracto-Technik Gmbh Procede et dispositif de stabilisation du sol
GB2398812A (en) * 2001-10-12 2004-09-01 Tracto Technik Method and device for ground stabilization
GB2398812B (en) * 2001-10-12 2005-11-02 Tracto Technik Method and device for ground stabilization
EP1418277A1 (fr) * 2002-11-06 2004-05-12 Chiaverotti BVBA Procédé de construction d'un mur de soutènement
BE1015173A5 (nl) * 2002-11-06 2004-10-05 Chiaverotti Bvba Werkwijze voor het bouwen van een beschoeiing.
EP1600560A1 (fr) * 2004-05-28 2005-11-30 Smet F & C Procede et disposotif pour réaliser un pieu de fondation
US7455479B2 (en) 2005-07-14 2008-11-25 Joseph Kauschinger Methods and systems for monitoring pressure during jet grouting
EP1748110A2 (fr) 2005-07-22 2007-01-31 SOILMEC S.p.A. Procédé et appareil de mélange du sol pour la réalisation de parois moulées
EP1961867A2 (fr) * 2007-02-22 2008-08-27 Trevi S.p.A. Procédé de construction de structure souterraine monolithique en béton
EP1961867A3 (fr) * 2007-02-22 2012-05-30 Trevi S.p.A. Procédé de construction de structure souterraine monolithique en béton
CN102325945A (zh) * 2009-02-20 2012-01-18 挖土机械有限公司 喷射注浆设备
CN102325945B (zh) * 2009-02-20 2014-06-18 挖土机械有限公司 喷射注浆设备
WO2010095153A1 (fr) * 2009-02-20 2010-08-26 Soilmec S.P.A. Equipement de jet grouting
US8757935B2 (en) 2009-02-20 2014-06-24 Soilmec S.P.A. Jet grouting equipment
CN101876170A (zh) * 2009-03-30 2010-11-03 疏浚国际股份有限公司 用于稳定基本上由淤泥和/或相关材料组成的土壤的方法及装置
BE1018515A3 (nl) * 2009-03-30 2011-02-01 Dredging Int Werkwijze en inrichting voor het stabiliseren van hoofdzakelijk uit slib en/of aanverwante materialen bestaande grond.
GB2489085A (en) * 2011-03-15 2012-09-19 Brian Peter Dunn Cutting tool for repairing pot holes by creating a circular area of repair in damaged road
EP2535461A1 (fr) 2011-06-16 2012-12-19 Keller Holding gmbh Procédé et dispositif de fabrication d'éléments de sol
CN103205968A (zh) * 2012-01-11 2013-07-17 特雷维有限责任公司 用于将待固结加压流体混合物喷射到地下的喷射头
CN103205968B (zh) * 2012-01-11 2016-06-08 特雷维有限责任公司 用于将待固结加压流体混合物喷射到地下的喷射头
EP2730702A1 (fr) * 2012-10-31 2014-05-14 Keller Holding GmbH Procédé et dispositif de fabrication de dépôts parallèles au moyen d'outils à jet
EP2728071A1 (fr) 2012-11-05 2014-05-07 Keller Holding GmbH Procédé et dispositif de fabrication d'éléments de sol formant une paroi
JP2014118669A (ja) * 2012-12-12 2014-06-30 Ryoji Watabe 基礎杭とその施工方法
JP2016075058A (ja) * 2014-10-06 2016-05-12 三和機材株式会社 地盤改良装置および地盤改良方法
JP2016176214A (ja) * 2015-03-19 2016-10-06 株式会社不動テトラ 地盤攪拌装置
EP3361040B1 (fr) * 2017-02-13 2019-11-27 BAUER Maschinen GmbH Outil de traitement de sol et procédé de production d'un trou dans le sol
BE1024948B1 (nl) * 2018-03-23 2018-08-23 Injectis Bvba Werkwijze en inrichting voor het behandelen van een bodem

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