EP0770734B1 - Verfahren zum Einbringen von Zugpfählen - Google Patents

Verfahren zum Einbringen von Zugpfählen Download PDF

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Publication number
EP0770734B1
EP0770734B1 EP19960810680 EP96810680A EP0770734B1 EP 0770734 B1 EP0770734 B1 EP 0770734B1 EP 19960810680 EP19960810680 EP 19960810680 EP 96810680 A EP96810680 A EP 96810680A EP 0770734 B1 EP0770734 B1 EP 0770734B1
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EP
European Patent Office
Prior art keywords
tube
cement
bore
injection
boring
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 - Lifetime
Application number
EP19960810680
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English (en)
French (fr)
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EP0770734A1 (de
Inventor
Vincenzo Sibilla
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Individual
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Individual
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Publication of EP0770734A1 publication Critical patent/EP0770734A1/de
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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
    • E02D5/74—Means for anchoring structural elements or bulkheads
    • E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
    • 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
    • E02D5/54—Piles with prefabricated supports or anchoring parts; Anchoring piles

Definitions

  • the present invention relates to a method of placing anchors designed to ensure the stability of a structure by with respect to land, involving the drilling of a hole into a ground anchoring area, introduction of cables and / or other tie rods in the borehole, and injection by said drilling hole of a cement suspension so as to form a sealing body in said anchoring zone.
  • EP-A-0413676 describes a process of the type mentioned above that a tool is used which has a part of a drilling tool and has an axial channel extending a injection channel, a valve being arranged at the inlet of said channel axial so as to close said front entrance injection of a cement suspension under pressure through the canal central and said axial channel.
  • the invention aims to provide a method of this type, which makes it possible to shorten considerably the time required to set up the tie rods and achieve very good anchoring, especially in types of terrain in which the usual methods do not allow not get satisfactory results. In particular, it targets process involving a particularly simple design of the tool.
  • the method according to the invention is characterized in that drilling is carried out by means of a tube fitted at its end front, of a drilling and injection tool, this tube forming a cement injection channel and said tool comprising at least two side nozzles oriented in opposite directions, and comprising a drilling tool part having an axial channel extending said injection channel, a valve being arranged between the inlet of said axial channel and said nozzles, so as to allow to close said entry before injecting the suspension of cement under pressure, which is injected with said suspension of cement in the surrounding terrain through said nozzles, radially said tube, with a pressure greater than about 15 MPa (150 bars), by rotating this tube around its axis and going up, continuously or discontinuously, over a length of determined seal, that the injection is then stopped and that the tube is completely reassembled, said cables and / or other tie rods being introduced into the borehole, before hardening of the cement, right down to the sealing body training.
  • the injection pressures of the cement suspension are, from preferably between 15 and 50 MPa (150 and 500 bars) and, in some case, between 50 and 90 MPa (500 and 900 bars).
  • the tube is re-introduced into the borehole after pressure injection of the cement suspension for the formation of the sealing body, after replacing the drilling and injection by a frontal annular crown whose inner diameter is substantially equal to the inner diameter of the tube, so that cables or other tie rods remain in place when reassembling this tube.
  • a frontal annular crown whose inner diameter is substantially equal to the inner diameter of the tube, so that cables or other tie rods remain in place when reassembling this tube.
  • the method according to the invention makes it possible to carry out, in a single injection operation, a sealing body in the form of a bulb essentially cylindrical, whatever the structure and kind of terrain. Indeed, the very high pressure of the injection of suspension of cement destroys, on a certain radius, the structure existing land and forms a bulb made up of a mixture of cement and ground debris. This process provides a good result controllable by injection pressure and by characteristics, such as speed and possible downtime, of the axial and circumferential movement of the tool during ascent of the tube.
  • a single injection operation being necessary, the setting in place of the tie rods requires only a fraction of the usual time and generally uses a quantity of cement injected much less.
  • a work to anchor 1 is based on a section of land 2 and is stabilized by a anchor, designated as a whole by reference 3.
  • This anchor comprises, in a known manner, for example tie cables 4 consisting of strands, one end of which is fixed in a tie head 5 resting on the structure 1.
  • the tie cables 4 are arranged in a borehole 6 on a certain free length and are integral with a body of sealing 7 in the form of a bulb formed around the part lower of the cement injection drill hole under high pressure in the surrounding terrain.
  • Fig. 1 gives only schematic representation of an example of a tie rod, the technique anchor being well known in itself.
  • the present method consists in using, for example, a tube 8 provided of a drilling and injection tool 9 according to FIG. 2 to drill, initially, hole 6 over a length corresponding to the desired free length and the sealing length which is essentially that of bulb 7 of FIG. 1.
  • the drilling is generally accompanied, in a known manner, by an injection water and air through the central channel 10 of the tube 8 and its extension 11 in the drilling part 12 of the tool 9.
  • a cement suspension is injected into the ground at a very high pressure, for example 450 bar, through two nozzles lateral 13, 14 small diameter, 1.5 to 2 mm, communicating with the central channel 10.
  • a valve 15 is arranged to close the channel 11 during this injection.
  • the tube is rotated around its axis and is slowly withdrawn from so that the jets produced by nozzles 13 and 14 in opposite radial directions enter the ground creating a essentially cylindrical bulb, as shown in FIG. 1.
  • the tube is completely reassembled and the tool 9 is replaced by a crown 16 which has an axial channel 17 having substantially the same diameter as channel 10.
  • the tube fitted with the crown 16 back into the borehole to the bottom of the sealing area and the cables are introduced through channel 10 tie rod or other suitable type of frame.
  • the tie cables or the armature remain in place through channel 17, and become integral with the bulb 7 during hardening thereof.
  • the present process allows in all cases of application to shorten, significantly, the time required to install the anchor rods, while providing reliable and well-controlled anchoring in all types of terrain, allowing high usage forces.

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  • 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 (5)

  1. Verfahren zur Anbringung von Zugpfählen (3) zur Sicherung der Stabilität eines Bauwerks (1) gegenüber einem Untergrund (2), wonach ein Loch (6) bis in die Verankerungszone im Boden gebohrt wird, Kabel und/oder andere Verstärkungselemente (4) in das Bohrloch eingeführt werden und durch das genannte Bohrloch eine Zementsuspension injiziert wird, um einen Ankerkörper (7) in der genannten Verankerungszone zu bilden, dadurch gekennzeichnet, dass die Bohrung mit Hilfe eines Rohres (8) durchgeführt wird, welches an seinem stirnseitigen Ende mit einem Bohr- und Injektionswerkzeug (9; 18, 21) versehen ist, wobei dieses Rohr einen Zementinjektionskanal (10, 19) bildet und das genannte Werkzeug mindestens zwei seitliche Düsen (13, 14; 23, 24), die in entgegengesetzte Richtungen gerichtet sind, und einen Bohrwerkzeugteil (12) aufweist, der einen den genannten Injektionskanal (10) verlängernden axialen Kanal (11) besitzt, wobei ein Ventil (15) zwischen dem Eingang des genannten axialen Kanals (11) und den genannten Düsen (13, 14) angeordnet ist, so dass der genannte Eingang vor der Injektion der unter Druck stehenden Zementsuspension geschlossen werden kann, dass die Injektion der genannten Zementsuspension durch die genannten Düsen in den benachbarten Boden radial in Bezug auf das Rohr mit einem Druck, der grösser ist als etwa 15 MPa (150 bar) erfolgt, wobei dieses Rohr um seine Achse gedreht wird und kontinuierlich oder diskontinuierlich über eine gegebene Verankerungslänge zurückgezogen wird, dass danach die Injektion beendet wird und das Rohr zur Gänze zurückgezogen wird, wobei die genannten Kabel oder anderen Verstärkungselemente (4) in das Bohrloch (6) vor dem Erhärten des Zements bis in den sich bildenden Ankerkörper eingeführt werden.
  2. Verfahren nach Patentanspruch 1, dadurch gekennzeichnet, dass der Injektionsdruck zwischen 15 und 50 MPa (150 und 500 bar) liegt.
  3. Verfahren nach Patentanspruch 1, dadruch gekennzeichnet, dass der Injektionsdruck zwischen 50 und 90 MPa (500 und 900 bar) liegt.
  4. Verfahren nach Patentanspruch 1, dadurch gekennzeichnet, dass das genannte Rohr (8) erneut in das Bohrloch und in den Ankerkörper vor dem Erhärten des Zements eingeführt wird, nachdem das Bohr- und Injektionswerkzeug (9) durch eine stirnseitige ringförmige Krone (16) ersetzt wurde, die einen axialen Kanal (17) aufweist, dessen innerer Durchmesser im wesentlichen gleich dem inneren Durchmesser des Rohres (8) ist, dass die genannten Kabel und/oder anderen Verstärkungselemente durch das genannte Rohr eingeführt werden und dieses Rohr zurückgezogen wird.
  5. Verfahren nach Patentanspruch 4, dadurch gekennzeichnet, dass eine Zementsuspension durch die genannte Krone (16) während des Wiedereinführens des Rohres (8) bis zum Grund des Bohrloches injiziert wird.
EP19960810680 1995-10-23 1996-10-11 Verfahren zum Einbringen von Zugpfählen Expired - Lifetime EP0770734B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH298895A CH691128A5 (fr) 1995-10-23 1995-10-23 Procédé de mise en place de tirants d'ancrage.
CH298895 1995-10-23
CH2988/95 1995-10-23

Publications (2)

Publication Number Publication Date
EP0770734A1 EP0770734A1 (de) 1997-05-02
EP0770734B1 true EP0770734B1 (de) 2000-01-05

Family

ID=4246139

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19960810680 Expired - Lifetime EP0770734B1 (de) 1995-10-23 1996-10-11 Verfahren zum Einbringen von Zugpfählen

Country Status (4)

Country Link
EP (1) EP0770734B1 (de)
CH (1) CH691128A5 (de)
DE (1) DE69606008T2 (de)
ES (1) ES2142565T3 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10017894A1 (de) * 2000-04-11 2001-10-25 Stump Spezialtiefbau Gmbh Verfahren und Vorrichtung zur Herstellung von hinterschnittenen Hohlräumen, insbesondere zur Herstellung von Traggliedern und Nägeln
CN102080377A (zh) * 2010-12-13 2011-06-01 张继红 复合锚杆及其导向施工方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE434088T1 (de) * 1999-09-23 2009-07-15 Forasol S A Bohr- und ankervorrichtung und verfahren zum setzen von verpressankern
US6672806B2 (en) 2000-11-22 2004-01-06 Forasol International Sa Device for drilling and anchoring and process for placing grout anchors
CN101806061B (zh) * 2010-03-16 2011-07-20 合肥工业大学 一种锚具以及利用其进行扩孔地锚的施工方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1539176A (fr) * 1967-08-03 1968-09-13 Soletanche Dispositif de tirant destiné à être ancré dans le sol
DE3926787C2 (de) * 1989-08-11 1998-07-02 Holzmann Philipp Ag Verfahren und Vorrichtung zum Einbringen und Verankern eines Zugpfahls
BE1004389A3 (nl) * 1989-08-14 1992-11-10 Smet Boring Nv Werkwijze en inrichting voor het in de grond bevestigen van ankers, nagels en gelijkaardige wapeningen.

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10017894A1 (de) * 2000-04-11 2001-10-25 Stump Spezialtiefbau Gmbh Verfahren und Vorrichtung zur Herstellung von hinterschnittenen Hohlräumen, insbesondere zur Herstellung von Traggliedern und Nägeln
CN102080377A (zh) * 2010-12-13 2011-06-01 张继红 复合锚杆及其导向施工方法
CN102080377B (zh) * 2010-12-13 2012-07-11 张继红 复合锚杆及其导向施工方法

Also Published As

Publication number Publication date
DE69606008T2 (de) 2000-09-07
EP0770734A1 (de) 1997-05-02
DE69606008D1 (de) 2000-02-10
CH691128A5 (fr) 2001-04-30
ES2142565T3 (es) 2000-04-16

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