EP2728071B1 - Procédé et dispositif de fabrication d'éléments de sol formant une paroi - Google Patents

Procédé et dispositif de fabrication d'éléments de sol formant une paroi Download PDF

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Publication number
EP2728071B1
EP2728071B1 EP12191322.2A EP12191322A EP2728071B1 EP 2728071 B1 EP2728071 B1 EP 2728071B1 EP 12191322 A EP12191322 A EP 12191322A EP 2728071 B1 EP2728071 B1 EP 2728071B1
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EP
European Patent Office
Prior art keywords
jet grouting
jet
tool
grouting tool
trench
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Active
Application number
EP12191322.2A
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German (de)
English (en)
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EP2728071A1 (fr
Inventor
Eduard Falk
Christian Sigmund
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Keller Holding GmbH
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Keller Holding GmbH
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Publication date
Application filed by Keller Holding GmbH filed Critical Keller Holding GmbH
Priority to PL12191322T priority Critical patent/PL2728071T3/pl
Priority to EP12191322.2A priority patent/EP2728071B1/fr
Publication of EP2728071A1 publication Critical patent/EP2728071A1/fr
Application granted granted Critical
Publication of EP2728071B1 publication Critical patent/EP2728071B1/fr
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00—Keeping dry foundation sites or other areas in the ground
    • E02D19/06—Restraining of underground water
    • E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
    • E02D19/16—Restraining of underground water by damming or interrupting the passage of underground water by placing or applying sealing substances
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00—Keeping dry foundation sites or other areas in the ground
    • E02D19/06—Restraining of underground water
    • E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
    • E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material

Definitions

  • the invention relates to a method and an apparatus for producing a vertical seal in the ground.
  • From the EP 0 436 954 B1 is a drilling device for creating columns in the ground known. At the lower end of the drill pipe is an outlet nozzle, is applied through the binder during drilling.
  • a method for producing concrete and cement bodies in the soil is known in which mutually parallel overlapping or tangent injection columns are created in the jet stream process in succession.
  • Such overlapping columns are used, for example, for sealing used in soil, for example in dams. They are created by injection technique (jet method).
  • injection technique jet method
  • a well-adapted to the substrate conditions injection agent is pressed from wells under high pressures in the ground.
  • the so-called high-pressure injection process which is also known under company names such as Soilcrete or Jet Grouting process, represents a further development of the injection process.
  • a pipe is sunk under rinse aid. After reaching the final depth of suspension is pressed at the lower end of the tube located side nozzle suspension with high pressures and pulled the tube with slow rotation or pivotal movement. This creates a body by the soil is solved by the suspension jets and mixed.
  • the present invention has the object to provide a method for producing vertical floor elements, with which the mentioned disadvantages can be avoided, or can be easily and quickly produced with the bottom elements for vertical sealing. Another object is to propose a corresponding device for carrying out the method.
  • a method for the production of floor elements in the ground is proposed, with the method steps: positioning at least one jet-jet tool on a bottom surface, the jet-jet tool having at least one downwardly directed nozzle; Move the jet tool along the bottom surface with the jet activated, drawing suspension down into the ground.
  • wall-shaped bottom elements which can also be referred to as vertical lamellae or sealing walls, can be produced relatively quickly and inexpensively.
  • the proposed method is particularly suitable for the production of wall-shaped floor elements with relatively shallow depths of up to five meters. Production takes place by injection technology, whereby a binder suspension is introduced into the soil at high pressure and high speed by means of a jet-jet tool. In this case, with the help of a downwardly high-energy cutting beam of water or binder suspension of the underlying bottom of the jet nozzle ground is cut or eroded. The eroded soil is rearranged and mixed with the binder, such as cement.
  • the exit speeds of the cutting jet can be over 100 m / s.
  • the liquid used and the feed rate it can reach a depth of up to three or at most four meters in one operation.
  • soils for the production of sealing walls with the mentioned method are particularly fine gravel soils, sand and silt.
  • the method can be performed after a first possibility directly on the ground.
  • the bottom surface on which the jet tool is positioned is the surface of the bottom.
  • the method can be carried out on a recessed bottom surface opposite the surface of the soil. This recessed bottom surface can be created by a removal of soil, for example by excavating a trench or suction, or by displacement of soil.
  • a trench is produced along the sealing wall to be created before the start of the injection process.
  • the trench preferably has an at least approximately horizontal lower edge with a depth of, for example, 30 cm to 120 cm. In this case, the lower edge forms the bottom surface on which the nozzle jet tool is positioned.
  • the width of the trench is preferably 30 cm to 50 cm.
  • the production of the trench or the execution of the jet-jet process starting from the lower edge of the trench has the advantage that the overflowing suspension can collect in the trench.
  • the trench contributes to the overall depth of the sealing wall to be created. That means with a deeper ditch deeper walls can be created.
  • the nozzle jet tool is positioned directly on the surface of the soil and moved along along the sealing wall to be created.
  • the nozzle jet tool has a nozzle drill bit, at the lower end of which the at least one nozzle is arranged.
  • at least one nozzle is meant that in principle also several nozzles can be provided, which are directed downwards.
  • the jets have a downward direction component. That is, the at least one nozzle may be oriented vertically downwards or may also include an angle with the vertical or with the axis of the nozzle beam linkage.
  • the nozzle is oriented so that a jet emerging from this jet with the axis of the nozzle beam linkage forms an angle of 0 ° to 45 °.
  • an angle-aligned nozzle it can lie in the plane of the sealing wall to be created or be aligned in the feed direction, according to a first possibility. In this way, a vertical sealing wall is created.
  • the nozzle which is pointed at an acute angle relative to the nozzle linkage, viewed in plan view of the nozzle linkage, can also be aligned transversely to the feed direction. In this way, that is, with respect to a vertical inclined nozzle, an inclined blade or sealing wall is generated.
  • the sealing wall forms a plane which has a slope corresponding to the inclination angle of the nozzle with a vertical plane along the feed. If two nozzles are used, they could be at an acute angle.
  • the nozzle jet tool can be moved along the bottom surface or along the trench by means of a drill.
  • the drive can also be done by means of a winch. This can be done in a favorable manner, a particularly slow and smooth feed motion.
  • the nozzle jet tool with nozzle jet linkage and rinsing head is preferably mounted on a mobile frame, which is also referred to as carriage.
  • the carriage can be guided on runners or rails along the trench.
  • the guide means may also include wheels and / or a crawler track.
  • the jet stream tool is moved along the trench at a rate of 0.2 min / m to 10 min / m while introducing suspension into the soil. It generally applies that the slower the feed movement of the tool along the trench, the greater the penetration depth of the suspension and the deeper is the sealing wall to be created.
  • a measuring device for measuring the speed of movement of the nozzle jet tool. This ensures a uniform feed rate, which in turn leads to a bottom element with at least largely uniform depth and width over the length.
  • a further method step may be provided: lowering a second nozzle jet tool to a depth below the bottom surface, the second jet tool having at least one downwardly directed nozzle; Moving the second jet tool along the already jet-blasted portion parallel to the first jet tool with the jet activated, with suspension being discharged down into the ground, the second jet tool being the first jet tool lags.
  • the above-mentioned bottom surface can, as explained above, be the surface of the bottom in the case of direct process control without prior production of a trench, or, if a trench has previously been produced, the lower edge of this trench.
  • the second nozzle jet tool it is advantageously possible to create sealing walls of greater depth, for example with a depth of up to five or six meters.
  • two jet nozzles or jet jets are moved simultaneously along the trench and the bottom surface, respectively.
  • the trailing (rear) second tool plunges two to four meters deeper into the ground than the leading (front) first tool.
  • the second tool assumes an additional depression of the sealing wall to be created.
  • the first tool may, for example, take over a first portion of the sealing wall having a first depth of about three meters, while the trailing second tool creates a second second sealing wall portion located below the first portion, for example having a depth of three to five meters can.
  • the resulting sealing wall thus has a total depth of about five meters.
  • the jet stream tool may preferably be lowered to a depth of two to four meters below the bottom surface or lower edge of the trench into the ground.
  • the nozzle axes can also be aligned in the above-mentioned form or the nozzle jet tools can be designed in the process control with a second jet-blasting operation on a level which is deeper than the first jet-blasting. That is, with “downwardly aligned” is meant that the jet tools are preferably in an angular range of 0 ° to 45 ° relative to the tool axis.
  • the solution of the above-mentioned object further consists in an apparatus for producing floor elements, in particular for carrying out the method according to the invention, comprising: a tool for producing a trench; a jet tool having at least one downwardly directed nozzle for discharging a suspension into the bottom at the lower end; Guide means for guiding the jet tool along the trench.
  • the trench can be made by removing soil material, for example by means of an excavator, or by displacing it.
  • the nozzle jet tool is characterized in that it has at least one nozzle which is directed downwards, in particular in an angular range of 0 ° to 45 °, preferably from 0 ° to 20 °, relative to a vertical.
  • the jet tool For driving the jet tool along the trench or the bottom surface may serve a drill on which the jet tool is mounted. Alternatively or in addition to this, a winch can be used for the propulsion, with which particularly slow and uniform movements can be achieved.
  • the jet-blasting tool can be mounted on a mobile frame which can be guided on runners or rails.
  • the device may comprise a second jet tool which can be lowered to a second depth below a first depth of the first jet tool and which has at least one downwardly directed nozzle.
  • the second nozzle jet tool is arranged so that it is downstream of the first nozzle jet tool in the direction of movement of the device. With the second nozzle jet tool, bottom elements can be produced with a greater total depth.
  • FIGS. 1a to 1c will be described together below.
  • An inventive method for producing floor elements by means of a device 2 according to the invention is shown.
  • the floor elements to be produced may extend vertically downwards or inclined over a certain length.
  • Such elongated floor elements are referred to herein as vertical or inclined blade or sealing wall.
  • the device 2 which may also be referred to as (jet) device comprises a mobile frame and a jet tool 6.
  • the device 2 stands up a floor surface 3 and facing the viewer.
  • a Switzerlandklermast 4 is fixed, which has a vertically movable support device 5 for supporting a jet beam linkage 7 for the jet tool 6.
  • the jet-jet tool 6 has one or more downward-pointing outlet nozzles 9, via which a suspension and / or water, optionally also surrounded by compressed air, can be discharged through the jet-jet linkage 7 into the adjacent base 3.
  • the nozzle 9 is present part of a nozzle bit 17 which is fixed to the lower end of the nozzle beam assembly 7.
  • the nozzle jet tool can do without drivable drill bit, that is, has a pure nozzle crown without drilling function.
  • the nozzle jet tool 6 can be guided by a through-boring head, by means of which the nozzle jet linkage 7 is rotatably driven about a rotational axis, wherein a rotating drive is not mandatory.
  • the nozzle beam linkage 7 is connected via a corresponding bracket or carriage with the broker 4 and movable relative to this.
  • a flushing head 8 is provided, which can be moved vertically at the broker 4.
  • a rotary drive may be provided, which would also be attached to the broker.
  • the rotary drive is used for rotatable, respectively pivotable driving of the nozzle beam linkage 7.
  • the flushing head 8, which is also referred to as a swivel, is used for connecting lines for introducing suspension or water, possibly also air, wherein the lines are not shown. To lower the nozzle jet tool 6 in the ground, the flushing head 8 are moved with the nozzle beam linkage 7 down.
  • a trench 10 is produced along the floor element to be created. This can be done by means of an excavator.
  • the trench 10 has a horizontally extending bottom surface, which may also be referred to as the lower edge 11.
  • the trench may have a depth T1 of about 1 meter.
  • the width of the trench 10 is preferably 30 cm to 50 cm. It is understood that the quantities mentioned here are only illustrative and not restrictive.
  • a modified process management which is not shown separately, can be dispensed with the preparation of a trench. In this case, the production of the vertical or inclined blade would take place directly from the surface of the soil.
  • the nozzle jet tool 6 is positioned on the lower edge 11 of the trench 9 in the next method step.
  • the term lower edge in the present case is not to be understood in the classical sense as a line formed between two surfaces, but as a lower boundary surface of the trench 10.
  • the jet device 2 with lowered to the lower edge 11 jet tool 6 is in Figure 1 b shown.
  • the jet device 2 is moved along the trench 9 in the direction R, that is, with respect to the Figure 1 b out of the drawing plane.
  • the movement along the trench 9 takes place with the nozzle jet activated, that is to say with the application of a suspension of binder, for example cement, and water into the bottom 3.
  • the nozzle 9 points vertically down, with some angle deviations from the vertical, in particular up to 45 ° tilt (aligned longitudinally or transversely to the direction of movement), are conceivable.
  • the jet is shown as dashed line 12.
  • the nozzle jet tool 6 at its end also has two nozzles 9, which are oriented downwards, vertically or inclined, and is introduced by the same suspension in the bottom 3.
  • the suspension is applied under high pressures and at high exit velocities, which may be over 100 m / s. In this case, the pending soil is dissolved by the suspension jet and mixed, so that a bottom body 13 is formed.
  • the soil body 13 thus produced may, depending on the soil, liquid used and feed rate of the jet device 2, have a depth T2 of three to four meters in one operation.
  • soils for the production of sealing walls with the mentioned method are particularly fine gravel soils, sand and silt.
  • the movement of the jet device 2 should be at a constant feed rate to produce a bottom body 13 of constant width and depth over the length.
  • the feed rate may be, for example, between 0.2 min / m and 10.0 min / m.
  • the advance of the jet-blasting tool 6 is accomplished by means of the mobile device 2.
  • the drive of the tool takes place by means of a winch along the trench 10, whereby a particularly slow and uniform feed motion can be realized.
  • a measuring device for measuring the speed of movement of the jet tool can be provided.
  • the finished bottom body or sealing wall 13 is in Figure 1 c shown.
  • This comprises an upper portion 14, which is formed by filling the trench 10 with suspension, and an underlying portion 15, which is produced by the injection method by means of jets.
  • the depth T2 of the bottom body 13 is composed of the depth T1 of the trench 10 plus the achieved depth of the jet 12. It can be seen that the upper portion 14 has a greater width than the underlying second portion 15th
  • FIGS. 2a and 2b show a method according to the invention in one opposite FIG. 1 extended embodiment.
  • the first in connection with the FIGS. 1a to 1c described process steps that is creating the trench 10, lowering the nozzle jet tool 6 to depth T1 of the lower edge 11 of the trench 10 and moving the nozzle beam device 2 in the direction R along the sealing wall to be created, to the desired end.
  • the jet tool 6 is pulled again, the jet nozzle 2 again to the starting point, that is to the other end of the bottom body moved back, and the jets performed at a deeper second depth.
  • the nozzle jet tool 6 is lowered in the starting point at least approximately to the depth T2 of the not yet hardened bottom body 13, which lies below the lower edge 11 of the trench 10. This position with nozzle jet tool 6 lowered to depth T2 is in FIG FIG. 2a shown.
  • the nozzle jet tool 6 is again moved along the trench 10 or along the already created bottom body 13 with activated jet with the application of suspension. In this way, a sealing wall with respect to the embodiment according to the FIGS. 1a to 1c create greater depth T3.
  • the bottom body or sealing wall 13 thus produced is composed of the upper trench section 14, the first jet section 15 and, in addition, the second jet section 16.
  • the sealing wall produced according to the extended method is in FIG. 2b shown.
  • the sealing wall 13 produced by said method may have a total depth T3 of up to five meters, depending on the soil, the liquid used and the speed of travel. It is understood that in the FIGS. 2a and 2b shown method can be performed in a modified embodiment, even without prior creation of a trench.
  • FIGS. 3a and 3b a method according to the invention or a device according to the invention is shown in a further embodiment which corresponds to those according to FIGS FIGS. 1 a to 1 c or 2a to 2b corresponds as far as possible.
  • the peculiarity of the present device 2 or of the present method is that a second jet-jet tool 6 'is provided, which is located downstream of the first jet-jet tool 6 in the direction of movement R of the device.
  • the device 2 is in FIG. 3a shown in side view. It can be seen that the first tool 6 is lowered to the depth T1 of the lower edge 11 of the trench and the second tool 6 'to the depth T2 of the lower edge of the upper nozzle jet portion 15.
  • the method is carried out so that first the first jet tool 6 is lowered to the depth T1 and the device at activated jet a first section along the bottom body to be created is moved.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Hydrology & Water Resources (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)

Claims (15)

  1. Procédé pour la fabrication d'éléments de sol, avec les étapes suivantes :
    positionnement d'au moins un outil à jet de buse (6) sur une surface de sol (11), l'outil à jet de buse (6) comportant au moins une buse (9) orientée vers le bas,
    déplacement de l'outil à jet de buse (6) le long de la surface de sol (11) pendant que le jet de buse est activé, une suspension étant diffusée vers le bas dans le sol (3).
  2. Procédé selon la revendication 1,
    caractérisé en ce que
    une étape de procédé précédant le positionnement de l'au moins un outil à jet de buse (6) prévoit :
    la réalisation d'un fossé (10), l'au moins un outil à jet de buse (6) étant positionné sur le bord inférieur (11) du fossé (10), laquelle forme la surface de sol, et l'outil à jet de buse (6) étant déplacé le long du fossé (10).
  3. Procédé selon la revendication 2,
    caractérisé en ce que
    le fossé (10) est réalisé avec une largeur d'environ 30 cm à 50 cm et/ou avec une profondeur d'environ 30 cm à 120 cm.
  4. Procédé selon la revendication 1 à 3,
    caractérisé en ce que
    l'outil à jet de buse (6) est déplacé au moyen d'un outil de forage ou au moyen d'un treuil à câble.
  5. Procédé selon l'une des revendications 1 à 4,
    caractérisé en ce que
    l'outil à jet de buse (6) comprend une tringlerie de jet de buse (7), laquelle est fixée sur un support mobile, le support mobile étant guidé sur des patins ou des rails.
  6. Procédé selon l'une des revendications 1 à 5,
    caractérisé en ce que
    une étape de procédé suivante prévoit :
    l'abaissement d'un deuxième outil à jet de buse (6') à une profondeur (T2) sous la surface du sol (11), à laquelle est positionné le premier outil à jet de buse (6), le deuxième outil à jet de buse comportant au moins une buse (9) orientée vers le bas,
    le déplacement du deuxième outil à jet de buse (6') parallèlement au premier outil à jet de buse (6) pendant que le jet de buse est activé, une suspension étant diffusée vers le bas dans le sol (3),
    le deuxième outil à jet de buse (6') suivant le premier outil à jet de buse (6).
  7. Procédé selon l'une des revendications 1 à 6,
    caractérisé en ce que
    après atteinte d'une extrémité d'une région destinée à recevoir le jet de buse, une étape de procédé suivante prévoit :
    le renvoi de l'au moins un outil à jet de buse (6) au point de départ,
    l'abaissement de l'outil à jet de buse (6) à une deuxième profondeur (T2) sous la surface du sol (11),
    le déplacement de l'outil à jet de buse (6) le long de la région déjà soumise au jet de buse, pendant que le jet de buse est activé, une suspension étant diffusée vers le bas.
  8. Procédé selon l'une des revendications 1 à 7,
    caractérisé en ce que
    l'outil à jet de buse (6) est déplacé à une vitesse de 0,2 min/m à 10 min/m, pendant que la suspension est diffusée dans le sol.
  9. Procédé selon l'une des revendications 1 à 8,
    caractérisé en ce que
    la vitesse de déplacement de l'outil à jet de buse (6) est mesurée et réglée pendant le fonctionnement de la buse.
  10. Dispositif pour la fabrication d'éléments de sol, en particulier pour la mise en oeuvre du procédé selon l'une des revendications 1 à 9, comprenant
    un outil pour la réalisation d'un fossé (10),
    au moins un outil à jet de buse (6, 6') comportant au moins une buse (9) orientée vers le bas à son extrémité inférieure, pour la diffusion d'une suspension dans le sol (3),
    un moyen de guidage destiné à guider l'outil à jet de buse (6) le long du fossé (10).
  11. Dispositif selon la revendication 10,
    caractérisé en ce que
    l'outil à jet de buse (6, 6') comporte une couronne de forage à buse (17, 17'), l'au moins une buse (9, 9') étant fixée à l'extrémité inférieure de la couronne de forage à buse et orientée vers le bas.
  12. Dispositif selon la revendication 10 ou 11,
    caractérisé en ce que
    le moyen de guidage comporte au moins un élément parmi des patins, des rails, des roues ou un train de roulement à chenille, pour guider l'au moins un outil à jet de buse (6, 6') le long de l'élément de sol (13) à fabriquer.
  13. Dispositif selon l'une des revendications 10 à 12,
    caractérisé en ce que
    il est prévu un outil de forage ou un treuil à câble pour entraîner l'au moins un outil à jet de buse (6, 6').
  14. Dispositif selon l'une des revendications 10 à 13,
    caractérisé en ce que
    il est prévu un dispositif de mesure destiné à mesurer la vitesse de déplacement de l'au moins un outil à jet de buse (6, 6').
  15. Dispositif selon l'une des revendications 10 à 13,
    caractérisé en ce que
    il est prévu un deuxième outil à jet de buse (6') susceptible d'être abaissé à une deuxième profondeur (T2) en dessous d'une première profondeur (T1) du premier outil à jet de buse (6), et comportant l'au moins une buse (9') orientée vers le bas.
    le deuxième outil à jet de buse (6') étant agencé de manière à être monté après le premier outil à jet de buse (6) dans la direction de déplacement (R).
EP12191322.2A 2012-11-05 2012-11-05 Procédé et dispositif de fabrication d'éléments de sol formant une paroi Active EP2728071B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PL12191322T PL2728071T3 (pl) 2012-11-05 2012-11-05 Sposób i urządzenie do wytwarzania ścianowych elementów gruntowych
EP12191322.2A EP2728071B1 (fr) 2012-11-05 2012-11-05 Procédé et dispositif de fabrication d'éléments de sol formant une paroi

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12191322.2A EP2728071B1 (fr) 2012-11-05 2012-11-05 Procédé et dispositif de fabrication d'éléments de sol formant une paroi

Publications (2)

Publication Number Publication Date
EP2728071A1 EP2728071A1 (fr) 2014-05-07
EP2728071B1 true EP2728071B1 (fr) 2016-02-03

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PL (1) PL2728071T3 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111851549B (zh) * 2020-07-20 2021-09-03 河南城建学院 一种砂土地质防渗墙施工方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0436954B1 (fr) 1990-01-11 1994-10-05 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
DE4111604A1 (de) 1991-04-10 1992-10-15 Keller Grundbau Gmbh Verfahren zum herstellen von beton- und zementkoerpern im boden
JPH06146260A (ja) * 1992-11-10 1994-05-27 Ask Kenkyusho:Kk 地盤に柱体を形成する方法及びその装置
DE4312231C2 (de) 1993-04-14 2002-01-31 Bilfinger Berger Bau Verfahren und Vorrichtung zur Herstellung von flächigen Bauelementen im Boden
EP1045073A1 (fr) 1999-04-15 2000-10-18 TREVI S.p.A. Outil d'excavation et procédé de fabrication d'une colonne en sol consolidée

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PL2728071T3 (pl) 2016-05-31

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