EP0672794B1 - Dispositif pour tassage du sol en profondeur - Google Patents

Dispositif pour tassage du sol en profondeur Download PDF

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Publication number
EP0672794B1
EP0672794B1 EP95103781A EP95103781A EP0672794B1 EP 0672794 B1 EP0672794 B1 EP 0672794B1 EP 95103781 A EP95103781 A EP 95103781A EP 95103781 A EP95103781 A EP 95103781A EP 0672794 B1 EP0672794 B1 EP 0672794B1
Authority
EP
European Patent Office
Prior art keywords
compression
fingers
compressor according
depth
depth compressor
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
EP95103781A
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German (de)
English (en)
Other versions
EP0672794A1 (fr
Inventor
Peter Rudloff
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.)
Terramix GmbH
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Terramix GmbH
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 Terramix GmbH filed Critical Terramix GmbH
Publication of EP0672794A1 publication Critical patent/EP0672794A1/fr
Application granted granted Critical
Publication of EP0672794B1 publication Critical patent/EP0672794B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • 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
    • E02D3/02—Improving by compacting
    • E02D3/046—Improving by compacting by tamping or vibrating, e.g. with auxiliary watering of the soil
    • 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
    • E02D3/02—Improving by compacting
    • E02D3/046—Improving by compacting by tamping or vibrating, e.g. with auxiliary watering of the soil
    • E02D3/054—Improving by compacting by tamping or vibrating, e.g. with auxiliary watering of the soil involving penetration of the soil, e.g. vibroflotation

Definitions

  • the invention relates to a deep compactor for compaction deep ground layers, according to the generic term of Claim 1.
  • a soil compactor is known from SU-A-146 38 67, which Foundation trenches or individual foundations due to free fall to produce a compression element.
  • a disadvantage of this solution is that compaction is deeper Soil layers are not possible.
  • Soil compactors have become known in numerous modifications.
  • DE-AS 20 59 644 is a soil compactor become known, the one by means of a pendulum arm pressure plate that can be placed on a gravel surface Vibrations offset, both horizontal and vertical Vibrations in the surface of the soil in the present Use case formed by a ballast bed of a track can be initiated.
  • Such compressors are good suitable when surface layers have to be compacted, for example, when crushed stone is on a stable base Deep layer is applied. Because of the tips on the compression elements penetrates the compression element in this known solution something in the gravel surface.
  • DE-AS 21 25 732 is a ballast compacting machine known, which should be particularly suitable for Threshold compression with multiple vibration peaks of the ballast.
  • the whole unit is one Swivel point S can be swiveled.
  • two counterbalance unbalance motors arranged, each over pressure plates on a wedge-shaped trained crossbar act with which the compression should be achieved.
  • This solution is mechanical the synchronous and counter-rotating unbalance motors, which have to be stored fairly stably, quite complex. Special measures must be taken to ensure that individual coarse stones of the ballast do not jam on the pressure plates, working against the yoke that supports the unbalance motors. In addition, this solution can be used for deep compaction do not achieve.
  • the invention is based on the object Depth compressor according to the preamble of claim 1 create the less sensitive to the soil structure and with which a reliable deep compaction without Removal of any surface layers such as a ballast bed is possible is.
  • the compression element has at least two essentially the same compression fingers hanging down on.
  • the compression is in the area between the compression fingers and surprising in the area adjacent to it well, the degree of compression benefits that Compression fingers when penetrating the deep compressor first cause horizontal pre-compaction and the following Yoke, even if it's not up to the compression range himself is led down because of his The ramming surface created pressures for vertical post-compaction achieved.
  • the structural independence of the depth compressor according to the invention is horizontal and due to the combination vertical compression forces improved and also with granular There is no lateral deflection of the soil to be compacted Areas after these of the at least two are facing down extending compression fingers clasped like pliers become.
  • the fact that that several compression fingers are of the same design are.
  • the compression progress can overlap, so that the rearmost compression finger is always in the hole is introduced by the foremost compression finger was left.
  • a lateral evasion of those to be compacted Layers are then safely prevented in so far as it is understands that, if desired, the rearmost compression finger longer than the other compression fingers can.
  • the invention is distinguished from the known solutions characterized in that the soil material compresses in deep areas is, after all from three sides of the invention Compression element is surrounded. For example blows initiated by a ram on the The shaft of the depth compressor becomes the compression element not just driven down. Rather, there are also vibrations the compression finger generates with its natural frequency, which also contribute to the compression and which the extraction of the depth compressor.
  • the compression fingers can either be conical or cylindrical be designed, basically a polygonal Cross section would also be possible.
  • the taper can be chosen in this way be that it is not necessary that the yoke hit the ground touched.
  • the cylindrical configuration is preferred with a cone at the end that has an obtuse cone angle. The cone causes a pre-compression, the stronger is, the larger the cone angle is, but what is the working speed reduced. Accordingly, the cone angle are clearly below 180 °, for example 120 to 150 °.
  • the degree of compaction is also affected by how large the distance between the compression fingers in relation to their diameter is. With already pre-compacted soil only a few compression fingers with a small diameter - based on their distance - are used. The diameter a compression finger, however, should not be under one Eighths of the distance between the compression fingers to ensure effective compaction. In this context, it is beneficial if both the number, the arrangement as well as the design of the compression fingers is adaptable to the desired conditions. According to One embodiment of the invention therefore provides that the compression fingers are releasably attached to the yoke.
  • pre-compression and post-compression are further adjustable over the length of the compression fingers.
  • the densification is advantageously done via a ramming surface below on the yoke, which is preferably V-shaped, so that penetration of the yoke into the ground is facilitated. It exists also the possibility of a downward facing T-beam to use as a ramming surface, with the crossbeam of the T acts as a ramming surface.
  • the depth compressor according to the invention is not for use limited when compacting gravel foundations. Rather, it is possible to use the deep compaction according to the invention used in all areas of earthworks, for example for the creation of embankment fillings, during the creation of terrain cuts to consolidate the deep layers as well as when creating substrates to be consolidated for road construction, but also for example for the soil improvement. If the inventive method of The compaction area can be used for deep compaction for example for drilling platforms or similar structures and loads from building structures can be constructively Simplified field when invented the soil pressure is increased by the deep compaction.
  • Deep compaction is also not on the dry area limited; rather, it can also be used in water-bearing Layers and, if desired, also below water Use horizons successfully.
  • the Speed is adjustable. This allows the frequency of the initiated Control vibrations within wide limits, resulting in corresponding Control options for the expansion of the Vibration field in all directions. This is also the degree of grain rearrangement effected according to the invention is controllable, which has an immediate impact on density and bearing capacity of the mass processed according to the invention.
  • two or several vibration exciters are provided. These can be both can be controlled individually, which changes the clock sequence of the initiated Vibrations can increase, as well as synchronized with each other be controlled what the performance of the initiated and emitted vibrations increased.
  • Such a thing System can be used particularly cheaply if several vibration fingers not just next to each other, but in at least two levels, i.e. one behind the other.
  • this Type of design of the depth compressor according to the invention it is possible to shape the vibrations that have been introduced several times take advantage of that in the space between the vibrating fingers one of the floors under the vibration exciter subjected to strong compression. Through the initiated The compression fingers also vibrate horizontally deflected, with the earth surrounded on all sides especially is heavily compressed.
  • vibration rams instead of or in addition to the preferably provided vibration rams, who work rather low frequency can be successfully use high-frequency vibration exciters, taking any generated interference due to the existing vibration maxima the grain rearrangement and thus the compaction in particular promote.
  • a depth compressor 10 has a shaft 12 and a compression element 14, which consists of a yoke 18 and in the case of four compression fingers 20 in the present exemplary embodiment consists.
  • the yoke 18 is welded to the shaft 12, wherein the connection between the yoke 18 and the shaft 12 additionally Anti-kink bars 22 and 24, which are inclined between the shaft and Yoke run, is reinforced.
  • the shaft 12 consists of a massive tube and has a receptacle 26 at its clamping end for a vibration hammer known per se. It goes without saying that instead of the picture shown, other suitable ones Recordings can be used. However, the admission must tensile forces can also be transmitted to the depth compressor to be able to remove compaction from the soil.
  • the yoke 18 is designed as a crossbar and points to it Underside recordings for the compression fingers 20 on.
  • the Compression fingers 20 can either be welded to the yoke be exchangeable or held in stable plug-in receptacles his. In any case, it is preferred to have both storage the lower end 30 and at the upper end 32 of the plug receptacle 34 should be provided, so that any lateral moments are good to be able to support.
  • the yoke according to the invention has a side at its lower end between the compression fingers 20 per ramming surface 36 on, which are designed substantially V-shaped, so that there is a penetration edge 38 at the bottom of the yoke 18.
  • the Angle of the V can be between about 90 and 150 °, being it is understood that any other suitable configurations are possible, for example a radius or a corresponding one Taper between the receptacles 34 on the Width of the yoke 18.
  • the distance is the two middle compression fingers 20 less than the distance between a middle and outer compression finger. This configuration is in the middle, so generates the strongest compression underneath the shaft 12. It goes without saying that instead of that a true to the grid Attachment of the compression fingers 20 is possible, as well, that the number of compression fingers 20 according to requirements is selected and, for example, even eight or can be ten.
  • Each compression finger has one at its lower end Cone 40, with which the compression finger 20 forming Tube is completed below.
  • the cone 40 makes it easier Penetration of each compaction finger 20 into the soil.
  • the depth compressor 10 is now either in the drawing direction or moved sideways.
  • the compression process generated holes before initiating the next one Compaction process filled with gravel or the like so as to prevent them from being subjected to the following compression process collapse.
  • an overlapping progression can also be chosen, so that the area to be compressed always clings to the side is and cannot break out.
  • Depth compressor 10 is provided, at least one injection nozzle 42 at the tip of at least one compression finger 20 to provide. It goes without saying that more than one Compression fingers 20 can be used and that more possible as an injection nozzle 42 per compression finger 20 is. Furthermore, it goes without saying that in addition to that shown here closable configuration of the injection nozzle 42 also a unlocked configuration is possible, especially if an injection nozzle 42 with a deflecting surface is used, the vibrations provided according to the invention upon initiation or vibrations are not easily blocked.
  • a Injection nozzle 42 a plurality of individual nozzles 44, 46, 48 depending on the circumference and the lower end of the compression finger 20 are arranged.
  • the individual nozzles 44, 46, 48 are each vertically slit-shaped so that they are in proportion only a small additional friction to their cross-sectional area when compressing according to the invention on the initiated Offer vibrations.
  • the individual nozzles 44, 46, 48 end with the upper edge of the tip cone 40 of the compression finger 20 and extend approximately 15 cm upwards. It is a plurality of individual nozzles 44, 46, 48 are provided, each around the circumference of the compression finger 20 are distributed without an even distribution necessarily would be necessary.
  • the injection nozzle 42 has a closure 50 with which it is lockable. Even if a twist lock in Is basically usable and only a slight twist due to the vertical orientation of the slots 44 to 48, is in the illustrated embodiment axially displaceable closure provided, which essentially consists of a cylinder attached to the inner circumference the compression finger 20 rests.
  • the shutter 50 is at the bottom on a deflection cone 52, which is opposite the tip cone 40 attached to the lower end of the compression finger 20 and the derivative of the inside of the compression finger 20 located injection material is used.
  • control pin 54 For guiding the closure 50 are on the inner circumference of the compression finger 20 welded control pin 54, the Configuration in the plan view from Fig. 3 can be seen.
  • the control pins 54 interact with two control elements 56, the opposite of each other on the inner circumference of the closure 50 are attached. After due to the vertical Vibrations the holding forces for the inert mass of the closure 50 need to be supported, it is cheaper to two opposing anchorages and controls 56 to use.
  • the control elements 56 cause a lock in the normal state between shutter 50 and compression finger 20.
  • train on a control cable 58 the connection is released and over the same control cable 58 can the shutter 50 so far lift that the injection nozzle 42 is fully released becomes.
  • the further control element 56 is via driver 60 with the opposite control element 56 connected so that a pivoting movement of the control element 56 about its axis 62 also to a correspondingly symmetrical Pivoting movement of the opposite control element 56 leads.
  • the control element 56 is basically a lever disk formed, the configuration of FIG. 3 can be seen better is.
  • the control element 56 has at its lower End a latch 64, which engages behind the control pin 54.
  • the control is on the top and bottom, but also on the side 56 ever bevelled so that there is little contact surface for the penetrating injection material.
  • the axis 62 supports the lever disk or the control element 56 on the closure 50.
  • the closure 50 is - as from FIG. 3 visible - in the area of the latch 64 and below this is provided with a slot 66 which widens upwards and then tapering to a point. The widening of the slot 66 enables the lateral deflection of the lever disk 56 when pulling on the control cable 58.
  • the dead weight of the lock 50 is so large in relation to the weight of the control 56 that the train on the control cable 58, the one Articulation point 68 is articulated on the lever disk 56, the lever disk 56 is initially pivoted clockwise, so that the latch 64 is released from the control pin 54.
  • the Locking pin 54 has an upper inclined surface 70 which when the closure 50 is lowered again, the deflection of the Lever disk by pivoting the latch 64 facilitated.
  • a corresponding one, for sliding on the inclined surface 70 suitably designed inclined surface 72 can be found below to the right of the latch 64.
  • the slot 66 also runs at the top the inclined surface 70 accordingly.
  • the state of the locking latch 64 is the control pin 54 between the latch 64 and the upper inclined surface the slot 66 is clamped, it being understood that the relevant seating surfaces if necessary with damping material, like with a rubber layer. It However, it must be ensured that a free swing out the latch 64 is not affected by the seat material becomes.
  • control cable 54 for the provision of the Locking function as well as for lifting the lock 50. It is understood that, if desired, instead of one Control cable 58 also two opposite control cables can be attached to the two control elements 56.
  • closure 50 over the axial Length extended in the illustrated embodiment can be one-sided due to the tendency to tilt to minimize attached control cable 58 when pulling up.
  • driver 60 is not as shown must be chamfered, but only as Round wires can be formed.
  • control element 56 When installing a control element 56 according to the invention it is preferred to first lock 50 together with the control 56 before the deflection cone 52 and then the tip cone 40 is welded on. However, it is understood that instead, the unit consisting of a deflection cone 52 and a tip cone 40 on the lower end of the compression finger 20 can be screwed on if there is free access for maintenance purposes to be made possible on the closure 50.
  • any other suitable closure can be used.
  • the conical surfaces the tip cone 40 be pivotally mounted so that the Injection material that is under hydraulic pressure inside of the compression finger 20 is an opening of the tip cone enables. If the finger is pulled out, it remains Tip cone then open and can be mechanically pulled out or if desired also by means of a corresponding one Electromagnets are closed.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Structural Engineering (AREA)
  • Agronomy & Crop Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Soil Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)

Claims (17)

  1. Dispositif de tassage en profondeur de couches de terrain profondes, comportant un axe qui est raccordé à un générateur de vibrations et auquel est relié, en particulier d'une seule pièce, un élément de tassage, caractérisé en ce que l'élément de tassage (14) est formé par au moins deux doigts de tassage (20) sensiblement identiques, suspendus vers le bas, vibrant sur leur longueur, introduits dans les couches de terrain profondes et agissant sur celles-ci, doigts de tassage entre lesquels s'étend une traverse (18) qui relie de manière fixe les doigts et avec laquelle la surface des couches de terrain peut être tassée.
  2. Dispositif de tassage en profondeur selon la revendication 1, caractérisé en ce que les doigts de tassage (20) sont sensiblement cylindriques et se terminent à leur extrémité inférieure en un cône (40) qui présente un angle de conicité de préférence de plus de 90°, en particulier d'environ 135°.
  3. Dispositif de tassage en profondeur selon la revendication 1 ou 2, caractérisé en ce que les doigts de tassage (20) sont disposés à un écartement les uns des autres qui représente une à quatre fois, en particulier deux fois, leur diamètre.
  4. Dispositif de tassage en profondeur selon une des revendications précédentes, caractérisé en ce que chaque doigt de tassage (20) présente une longueur qui représente sept à vingt fois son diamètre.
  5. Dispositif de tassage en profondeur selon une des revendications précédentes, caractérisé en ce qu'il est prévu côte à côte quatre à huit, en particulier quatre doigts de tassage (20), l'écartement des deux doigts de tassage (20) centraux étant inférieur à l'écartement entre les doigts de tassage (20) centraux et les doigts de tassage (20) latéraux.
  6. Dispositif de tassage en profondeur selon une des revendications précédentes, caractérisé en ce que la traverse (18) s'étend transversalement sur tous les doigts de tassage (20) et comporte en bas une surface de compression (36) qui est conçue pour la pénétration dans le sol et se termine en particulier en pointe vers le bas.
  7. Dispositif de tassage en profondeur selon une des revendications précédentes, caractérisé en ce que les doigts de tassage (20) sont fixés de manière amovible à la traverse (18) et le nombre et l'épaisseur des doigts de tassage (20) peuvent être adaptés au degré de tassage préalable des couches de terrain à tasser.
  8. Dispositif de tassage en profondeur selon une des revendications précédentes, caractérisé en ce que l'axe (12) est relié à la traverse (18) de plus par des barres de protection contre le flambage (22, 24) qui permettent d'absorber une sollicitation inégale des doigts de tassage (20) due à des variations des conditions du sol, ainsi qu'une éventuelle force latérale agissant lors de l'extraction du dispositif de tassage en profondeur (10).
  9. Dispositif de tassage en profondeur selon une des revendications précédentes, caractérisé en ce que l'axe (12) est suspendu par son extrémité de fixation à un batteur à vibrations par l'intermédiaire duquel le dispositif de tassage en profondeur (10) peut être enfoncé dans le sol avec une séquence de battage réglable, en particulier comprise entre 8 et 0,5 coups par minutes.
  10. Dispositif de tassage en profondeur selon une des revendications précédentes, caractérisé en ce que la hauteur verticale du bord inférieur (38) de la traverse représente environ 40 à 90%, de préférence 50 à 70%, et en particulier environ 60% de l'écartement entre l'extrémité de fixation de l'axe (12) et l'extrémité inférieure des doigts de tassage (20).
  11. Dispositif de tassage en profondeur selon une des revendications précédentes, caractérisé en ce que la largeur du dispositif de tassage en profondeur (10) représente 20 à 150%, de préférence 50 à 90%, et en particulier environ 70% de l'écartement entre l'extrémité de fixation de l'axe (12) et l'extrémité inférieure des doigts de tassage (20).
  12. Dispositif de tassage en profondeur selon une des revendications précédentes, caractérisé en ce que l'axe (12) est raccordé à un générateur de vibrations dont la fréquence peut être commandée.
  13. Dispositif de tassage en profondeur selon une des revendications précédentes, caractérisé en ce qu'au moins un doigt de tassage (20) creux comporte une buse d'injection (42).
  14. Dispositif de tassage en profondeur selon la revendication 13, caractérisé en ce que la buse d'injection (42) est prévue en bas sur un doigt de tassage (20), laquelle buse d'injection peut être fermée par un dispositif de fermeture (50) pendant la transmission de vibrations à l'élément de tassage (14).
  15. Dispositif de tassage en profondeur selon la revendication 14, caractérisé en ce que le dispositif de fermeture (50) comporte une commande avec laquelle il peut être ouvert en cas de besoin soit par la pression d'un matériau d'injection soit par des éléments de commande (56) mécaniques ou électromécaniques et peut être commandé de telle sorte qu'il reste ouvert pendant l'extraction des doigts de tassage (20).
  16. Dispositif de tassage en profondeur selon une des revendications précédentes, caractérisé en ce qu'un doigt de tassage (20) creux est utilisé comme conduite pour du matériau d'injection tel que du ciment, et l'axe (12) comporte un raccord hydraulique par l'intermédiaire duquel le matériau d'injection peut être injecté hydrauliquement dans le sol par la buse d'injection (42).
  17. Dispositif de tassage en profondeur comportant au moins deux générateurs de vibrations à chacun desquels est raccordé un dispositif de tassage en profondeur selon la revendication 1.
EP95103781A 1994-03-16 1995-03-15 Dispositif pour tassage du sol en profondeur Expired - Lifetime EP0672794B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4409008 1994-03-16
DE4409008A DE4409008C2 (de) 1994-03-16 1994-03-16 Tiefenverdichter

Publications (2)

Publication Number Publication Date
EP0672794A1 EP0672794A1 (fr) 1995-09-20
EP0672794B1 true EP0672794B1 (fr) 2001-08-01

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DE (2) DE4409008C2 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19845132A1 (de) * 1998-10-01 2000-04-06 Hossein Hosseini Tudeshki Verfahren und Anlage für die Verdichtung von bindigem und nichtbindigem Gut (z. B. Lockergestein) durch Drehspiralverdichtung bzw. Drehspiralstopfverdichtung
DE10105480A1 (de) * 2001-02-07 2002-08-08 Franz Schauer Erdreich- und/oder Schüttgutverdichtungsvorrichtung
AU2010271068B2 (en) * 2009-06-24 2015-07-16 Geopier Foundation Company, Inc. Apparatus and method for ground improvement
DE102010022802B4 (de) * 2010-06-05 2016-06-09 Ecosoil Ost Gmbh Verfahren und Vorrichtung zur Verbesserung der bodenmechanischen Eigenschaften von Böden im amphibischen Wasser-Land-Übergangsbereich von Gewässern, Bodensenken und Baugrundsanierungsgebieten
DE202016107232U1 (de) 2016-12-21 2017-03-01 BUG Dienstleistungen GmbH & Co. KG Verdichtungsanlage für die Verdichtung von verdichtungsfähigen Böden unter Verwendung eines Trägergerätes
DE102016125155B4 (de) 2016-12-21 2023-07-06 BUG Dienstleistungen GmbH & Co. KG Verdichtungsanlage für die Verdichtung von verdichtungsfähigen Böden unter Verwendung eines Trägergerätes
EP4400653A1 (fr) * 2023-01-12 2024-07-17 Keller Holding GmbH Système de vibrateur de profondeur et procédé de compactage du sol au moyen d'un système de vibrateur de profondeur

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD62261A (fr) *
DE2125732B2 (de) * 1971-05-25 1976-10-14 Werkzeug fuer eine schotterverdichtmaschine
US3865501A (en) * 1973-07-09 1975-02-11 Int Tech Handelsonderneming En Method and device for soil compacting
DE2856144A1 (de) * 1978-12-27 1980-07-17 Bilfinger Berger Bau Verfahren zur erzeugung oder verbesserung der kohaesion rolliger boeden waehrend der ruetteldruckverdichtung
SE456507B (sv) * 1984-11-12 1988-10-10 Pieux Armes Int Forfarande och anordning for att medelst vibrationer packa ett jordlager
NL8701654A (nl) * 1987-07-14 1989-02-01 Ballast Nedam Groep Nv Werkwijze en inrichting voor het verdichten van grond.

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Publication number Publication date
DE59509455D1 (de) 2001-09-06
EP0672794A1 (fr) 1995-09-20
DE4409008C2 (de) 1999-08-19
DE4409008A1 (de) 1995-10-05

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