EP0102060A2 - Dispositif de réglage automatique de la hauteur de la lame d'arasement d'une finisseuse à plaque conformatrice - Google Patents

Dispositif de réglage automatique de la hauteur de la lame d'arasement d'une finisseuse à plaque conformatrice Download PDF

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Publication number
EP0102060A2
EP0102060A2 EP83108353A EP83108353A EP0102060A2 EP 0102060 A2 EP0102060 A2 EP 0102060A2 EP 83108353 A EP83108353 A EP 83108353A EP 83108353 A EP83108353 A EP 83108353A EP 0102060 A2 EP0102060 A2 EP 0102060A2
Authority
EP
European Patent Office
Prior art keywords
scraper
level
height
pressure plate
point
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.)
Granted
Application number
EP83108353A
Other languages
German (de)
English (en)
Other versions
EP0102060A3 (en
EP0102060B1 (fr
Inventor
Gerd Sonntag
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.)
Heilit & Woerner Bau-Ag
Heilit und Woerner Bau AG
Original Assignee
Heilit & Woerner Bau-Ag
Heilit und Woerner Bau AG
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 Heilit & Woerner Bau-Ag, Heilit und Woerner Bau AG filed Critical Heilit & Woerner Bau-Ag
Publication of EP0102060A2 publication Critical patent/EP0102060A2/fr
Publication of EP0102060A3 publication Critical patent/EP0102060A3/de
Application granted granted Critical
Publication of EP0102060B1 publication Critical patent/EP0102060B1/fr
Expired legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/22—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for consolidating or finishing laid-down unset materials
    • E01C19/42—Machines for imparting a smooth finish to freshly-laid paving courses other than by rolling, tamping or vibrating
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/22—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for consolidating or finishing laid-down unset materials
    • E01C19/30—Tamping or vibrating apparatus other than rollers ; Devices for ramming individual paving elements
    • E01C19/34—Power-driven rammers or tampers, e.g. air-hammer impacted shoes for ramming stone-sett paving; Hand-actuated ramming or tamping machines, e.g. tampers with manually hoisted dropping weight
    • E01C19/40—Power-driven rammers or tampers, e.g. air-hammer impacted shoes for ramming stone-sett paving; Hand-actuated ramming or tamping machines, e.g. tampers with manually hoisted dropping weight adapted to impart a smooth finish to the paving, e.g. tamping or vibrating finishers
    • E01C19/405—Power-driven rammers or tampers, e.g. air-hammer impacted shoes for ramming stone-sett paving; Hand-actuated ramming or tamping machines, e.g. tampers with manually hoisted dropping weight adapted to impart a smooth finish to the paving, e.g. tamping or vibrating finishers with spreading-out, levelling or smoothing means other than the tamping or vibrating means for compacting or smoothing, e.g. with screws for spreading-out the previously dumped material, with non-vibratory lengthwise reciprocated smoothing beam
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/22—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for consolidating or finishing laid-down unset materials
    • E01C19/30—Tamping or vibrating apparatus other than rollers ; Devices for ramming individual paving elements
    • E01C19/34—Power-driven rammers or tampers, e.g. air-hammer impacted shoes for ramming stone-sett paving; Hand-actuated ramming or tamping machines, e.g. tampers with manually hoisted dropping weight
    • E01C19/40—Power-driven rammers or tampers, e.g. air-hammer impacted shoes for ramming stone-sett paving; Hand-actuated ramming or tamping machines, e.g. tampers with manually hoisted dropping weight adapted to impart a smooth finish to the paving, e.g. tamping or vibrating finishers
    • E01C19/407—Power-driven rammers or tampers, e.g. air-hammer impacted shoes for ramming stone-sett paving; Hand-actuated ramming or tamping machines, e.g. tampers with manually hoisted dropping weight adapted to impart a smooth finish to the paving, e.g. tamping or vibrating finishers with elements or parts partly or fully immersed in or penetrating into the material to act thereon, e.g. immersed vibrators or vibrating parts, kneading tampers, spaders
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
    • E01C23/04—Devices for laying inserting or positioning reinforcing elements or dowel bars with or without joint bodies; Removable supports for reinforcing or load transfer elements; Devices, e.g. removable forms, for making essentially horizontal ducts in paving, e.g. for prestressed reinforcements

Definitions

  • the invention relates to a device for automatically regulating the pre-stripper height of a slipform paver, which has a pre-stripper, a pressure plate which is spaced apart from it and forms an upper slipforming, and possibly a vibrating device in the intermediate area.
  • the level of paving material in the area between the scraper and the pressure plate must be kept within relatively narrow limits of, for example, + 2 cm around a setpoint of, for example, 5 cm above the underside of the pressure plate. If the level is too low, the pressure plate cuts into the liquid slurry area too much, so that accordingly less installation material gets under the pressure plate, which can result in corresponding imperfections, in particular holes, in the concrete ceiling. In addition, the top layer of the pavement produced in this way has lower strength and tends to dry out.
  • the pressure plate cuts into the concrete material too far below the approximately constant slurry layer given the concrete moisture. The result is that the concrete material under the pressure plate is too dry, so that a flat, smooth road surface can no longer be achieved. So far, the level of paving material has been regulated by hand by constantly monitoring the level and lowering the pre-scraper if the level is too high and raising the pre-scraper if the level is too low. Experienced specialists had to be provided for this activity. Manual readjustment proved to be particularly problematic in the case of two-shift production of pavements.
  • an upper concrete layer is placed on the lower concrete layer applied first.
  • a sludge layer of smaller thickness is created in the area between the preliminary scraper and the pressure plate due to the smaller concrete volume, which requires a correspondingly more precise level regulation.
  • the object of the invention is to enable automatic regulation of the pre-scraper height of a slipform paver.
  • a level sensor in the area between the preliminary scraper and pressure plate for the paving material a height adjustment drive for the preliminary scraper and a control device which compares a determined actual level of the paving material with a target level and, in the direction of a reduction in the level difference, the Height adjustment drive controls.
  • a particularly simple structure of the device is obtained when it operates in the manner of a three-point control, one switch position being the neutral position and the other two switch positions following the commands "preliminary wipers raise “or lower pre-scraper".
  • a follow-up control is provided according to the invention with different target level values that can be entered manually.
  • the level sensor can comprise, for example, a level measuring plate sliding above the concrete surface.
  • the level sensor comprises a floating body element. This shows the level of sludge that is of particular interest.
  • the floating body element is articulated on the scraper and that the height of a reference point of the floating body element between the articulation point and the center of buoyancy is defined as the actual level, which preferably is a distance from the articulation point between 1/4 and 3/4 , better 1/3 to 2/3, ideally about half the distance between the pivot point and the center of buoyancy.
  • the position of the reference point depends not only on the actual sludge level, but also on the respective height of the scraper.
  • the time duration of the actuating signal "lower wipers" generated when the upper limit of the fluctuation range of the sludge level is exceeded consequently depends on the one hand on the degree of level deviation and on the other hand on the pre-wiping movement taking place in the opposite direction. Because of the latter movement there is a well-defined end of the control signal mentioned, which is much earlier compared to an arrangement in which the center of buoyancy is defined as the actual level.
  • the invention takes into account the fact that the sludge level change based on a change in the scraper height only follows the change in the scraper height with a relatively large time delay.
  • the floating body element preferably consists of a preferably spherical or cylindrical floating body and a connecting link carrying the floating body at one end and articulated at the other end to the scraper.
  • a floating body with connecting link is simple to manufacture and mechanically robust.
  • a measuring rod connected at the reference point to the floating body element, possibly the connecting link, is preferably articulated there, which can be coupled to a three-point switch .
  • a certain switching hysteresis can be provided in the upper and lower of the three switching points.
  • a switch actuating element which can be optionally attached to the measuring rod in various positions along the measuring rod is provided for the three-point switch, which enables simple and quick setting or readjusting of the desired level. It can be provided that the switch actuation element is articulated to a switching lever of the three-point switch and that the switch actuation element engages around the measuring rod and can be fixed on the measuring rod by means of a locking screw.
  • the height adjustment drive comprises at least one preferably double-acting hydraulic cylinder.
  • the hydraulic cylinder preferably engages the pre-scraper via a double-arm lever articulated on the pressure plate.
  • the optimal height difference between the preliminary scraper and the pressure plate is essentially independent of the height of the pressure plate.
  • the permissible swivel range of the double-arm lever articulated on the pressure plate can therefore be in a constant small range even with widely differing pressure plate heights.
  • the three-point switch directly controls a corresponding hydraulic device for the at least one hydraulic cylinder.
  • an electrical control circuit is preferably provided, which is connected to the electromechanical three-point switch and controls a hydraulic device connected to the at least one hydraulic cylinder. Such a control circuit can be changed more easily if it functions reliably, in particular with regard to its control properties.
  • the formation is designated 10.
  • a one or two-layer concrete road surface 12 is to be erected on this level.
  • auxiliary banquets 14 are first built on both sides of the longitudinal edges thereof, as indicated in FIG. 1.
  • slipform paver can also run in a conventional manner on rails which rest directly on the formation.
  • the slipform paver 16 comprises two crawler tracks 18 on the side for driving on the auxiliary banquets 14 or on stationary formwork and running rails 44 placed thereon.
  • the crawler tracks 18 are equipped with rubber studs 20.
  • a distributor 22 is arranged for the paving material 24, said manifold 22 a perpendicular to the plane of IG F. 1 reciprocating motion.
  • the slipform paver 16 comprises a sliding formwork, which consists of a horizontal pressure plate 26 and vertical side formwork, which can also be omitted when using the formwork and running rails 44.
  • vibrating elements in the form of so-called vibrating bottles 30 are distributed over the width of the resulting roadway surface 12 and are immersed in the installation material 24 distributed by the distributor 22.
  • a preliminary scraper 32 is arranged between the vibrating bottles 30 and the distributor 22. As will be explained in more detail below, the height of the preliminary scraper 32 is regulated automatically.
  • the pre-stripper 32 is rigidly attached to one end of a bent double-arm 49, which on the vertical front wall 26a of the pressure plate 26 is pivoted in the crease area and the piston rod 52a engages via a hydraulic cylinder 5 0, at the other end of the lever, a horizontal pivot axis 54 is pivotable.
  • a dowel setting device 34 is arranged at the rear end, which can be moved up and down in the vertical direction and is intended for inserting dowels 36 into the road surface 12. In the area of these dowels 36, a parting line is cut as a predetermined breaking point in a subsequent operation.
  • FIG. 2 shows the basic structure of the device according to the invention for the automatic control of the pre-scraper height.
  • the distributor 22 is omitted here.
  • the scraper 32 in the form of an elongated plate with a lower horizontal longitudinal edge and a slightly inclined upper edge towards the pressure plate 26 pushes a mountain of paving material 24 in front of it.
  • the slipform paver according to the invention is suitable both for a single-layer ceiling structure (FIG. 1) and for a two-layer structure (FIG. 2). In the latter case, a second layer 12b of wear-resistant split concrete is applied to the prefabricated first layer 12a made of less expensive round-grain concrete, which is shown in FIG. 2.
  • a particularly water-rich slurry or slurry layer 57 forms on the surface of the material 24.
  • the thickness of this slurry layer 57 is approximately constant for a given moisture level of the supplied installation material 24.
  • the horizontal underside of the pressure plate 26 lies approximately at the level of the bottom of the slurry layer 57.
  • a certain proportion of the slurry layer 57 reaches below the rounded front edge 26b of the pressure plate 26 and thus with the other installation material 24 under the pressure plate 26. This portion is essential for a smooth upper ceiling.
  • the thickness of the slurry layer on the paving material below the pressure plate 26 depends on the level c of the paving material removed from the scraper 32 in front of the pressure plate 26, this thickness can be readjusted by changing the slurry level in front of the pressure plate 26.
  • the readjustment can be based on the level h of the slurry surface, since the slurry layer 57 in front of the pressure plate 26 has an essentially constant thickness d with the concrete consistency remaining the same. It can be seen that the level can be raised by lifting the pre-stripper 32. Accordingly, the pre-stripper 32 is lowered to lower the level.
  • a cylindrical float 56 with a horizontal cylinder axis 56a, which extends transversely to the direction of movement A, is used to determine the actual level, which is immersed in the slurry layer 57 in the region above the bottles 30.
  • the floating body 56 is articulated on the inside of the preliminary scraper 32 by means of an approximately horizontally extending connecting link 58 (pivot pin 60).
  • An approximately vertical measuring rod 62 is in turn articulated on the connecting link 58, specifically at a point (reference point 64) which lies approximately halfway between the distance a from the cylinder axis 56 and the pivot pin 60.
  • the upper end of the measuring rod 62 passes through a corresponding bore of a switch actuating element 66; a locking screw 66a which is radial with respect to the measuring rod axis allows the switch actuating element to be fixed elements 66 in different height positions on the measuring rod 62.
  • an electromechanical three-point switch 68 is fastened in the area of the upper measuring rod end, the switch lever 68a of which runs horizontally in a central or neutral position and from this position in a vertical plane up to an upper end position and downwards in a lower end position is pivotable (dashed or dotted lines in FIG. 2). 2, a movable contact 68b following the lever movement is indicated, which is exposed in the central position of the lever 68a, touches the fixed contact 70a in the upper end position of the lever and the fixed contact 70b in the lower end position of the lever. Similar to the thermostat controls, the switchover from the middle position to the upper contact position and back can be provided with a switching hysteresis. The same can also be provided for the transition to the lower switching position and back.
  • the two fixed contacts 70a and 70b are connected to a control circuit 74 via corresponding electrical lines 72a and 72b, indicated by dash-dotted lines.
  • the circuit 74 controls a four / three-way valve 76 via a control line 78.
  • the two upper connections of the valve 76 are connected on the one hand to a hydraulic line 80a, which leads to the pressure connection of a hydraulic pump 82, and on the other hand to a return line 80b, which is in one Hydraulic oil reservoir 84 opens.
  • the pump 82 is supplied with pressure fluid from the reservoir 84 via a line 80c.
  • the two lower connections of the valve 76 in FIG. 2 are connected to the two connections 50a and 50b of the double-acting cylinder 50 via hydraulic lines 80d and 80e.
  • One at the Piston rod 52a provided in the cylinder interior working piston 52b divides the cylinder interior into two working spaces, the working space surrounding the piston rod 52a planar is connected to the connection 50b and the other to the connection 50a.
  • valve 76 In the central position of valve 76 shown in FIG. 2, line 80a is connected to line 80b; the lines 80d and 80e, on the other hand, are shut off by the valve 76.
  • the piston 52b can therefore not move in the axial direction within the cylinder 50, so that accordingly the preliminary scraper 32 is immovable relative to the pressure plate 26 via the blocked piston rod 52a and the double arm lever. If for some reason the level of the paving material 24 including the slurry layer 57 rises relative to the pressure plate 26, the float 56 is raised and with it the measuring rod 62, but by half the way. Since the free end of the switching lever 68a of the switch 68 is articulated on the switch actuating element 66, the switching lever 68a pivots in accordance with the movement of the measuring rod.
  • the pump 82 If the pump 82 does not run continuously, it is started by the circuit 74 via a line 74a, whereupon the corresponding hydraulic pressure causes the piston rod 52a to extend and thus to turn on Lowering the preliminary scraper 32. Since the level h changes accordingly only with a relatively large time delay after the beginning of the lowering of the preliminary scraper 32, the cylinder axis 56a forms a momentarily spatially constant pivot axis with respect to the connecting link 58 when the preliminary scraper 32 is lowered. As a result, it lowers the measuring rod 62 down by half the distance covered vertically downwards by the scraper 32 until finally the switch 68 switches back to its neutral central position. The control circuit 74 then switches the valve 76 back into the central position shown in FIG. 2, in which the preliminary scraper 32 is stationary relative to the pressure plate 26.
  • the control circuit 74 switches the valve 76 into the third switching position in which the lines 80a and 80e and the lines 80b and 80d are connected to one another.
  • the piston rod 52a is consequently pushed into the cylinder 50 and the preliminary scraper is raised accordingly until the switch 68 is finally switched to its central position via the moving switching rod 62.
  • the switch actuating element 66 must be attached to the measuring rod 62 at a comparatively lower point on the latter; for lowering the target level of the S must chalterbetutzrienselement 66 are shifted upward.
  • the target height h can be in a range of 11 ⁇ 2 cm kept under little mechanical effort, at a
  • Top layer 12b thickness from 6 to 7 cm.
  • the thickness of the lower layer 12 a is about 15 cm.
  • the height control is based on the height h 'of the reference point 64 as the actual value. Accordingly, the sum of the sludge level setpoint and the distance b of the cylinder axis 56 forming the center of buoyancy of the floating body 56 from the sludge surface results as the desired value.
  • the height h in turn is composed of the thickness c of the actual concrete layer and the thickness d of the liquid slurry layer 57 .

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Paving Machines (AREA)
EP83108353A 1982-08-27 1983-08-24 Dispositif de réglage automatique de la hauteur de la lame d'arasement d'une finisseuse à plaque conformatrice Expired EP0102060B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3232020 1982-08-27
DE19823232020 DE3232020A1 (de) 1982-08-27 1982-08-27 Vorrichtung zur selbsttaetigen regelung der vorabstreiferhoehe eines gleitschalungsfertigers

Publications (3)

Publication Number Publication Date
EP0102060A2 true EP0102060A2 (fr) 1984-03-07
EP0102060A3 EP0102060A3 (en) 1985-05-02
EP0102060B1 EP0102060B1 (fr) 1986-11-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP83108353A Expired EP0102060B1 (fr) 1982-08-27 1983-08-24 Dispositif de réglage automatique de la hauteur de la lame d'arasement d'une finisseuse à plaque conformatrice

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EP (1) EP0102060B1 (fr)
DE (2) DE3232020A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0186780A1 (fr) * 1984-12-27 1986-07-09 Dynapac Aktiebolag Dispositif pour disperser de l'adhésif bitumineux
EP0376692A3 (fr) * 1988-12-29 1991-07-17 David W. Somero Machine de revêtement et procédé
US6129481A (en) * 1998-03-31 2000-10-10 Delaware Capital Formation, Inc. Screed assembly and oscillating member kit therefor
US6227761B1 (en) 1998-10-27 2001-05-08 Delaware Capital Formation, Inc. Apparatus and method for three-dimensional contouring
US7311466B2 (en) 2004-07-06 2007-12-25 Somero Enterprises, Inc. Apparatus and method for subgrade preparation
US7399139B2 (en) 1998-10-27 2008-07-15 Somero Enterprises, Inc. Apparatus and method for three-dimensional contouring
GR1010235B (el) * 2021-06-16 2022-05-19 Χρηστος Γεωργιου Τζεκας Ιδιοκατασκευη διαμορφωσης και επενδυσης ταφρων με σκυροδεμα
CN120250748A (zh) * 2025-06-05 2025-07-04 山西省太原生态环境监测中心 一种河道底泥挖掘装置

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3810891A1 (de) * 1988-03-30 1989-10-19 Heilit & Woerner Bau Ag Tragschichtfertiger
DE29612627U1 (de) 1996-06-29 1997-10-30 Teerbau GmbH, 45257 Essen Gleitschalungsfertiger für Betonfahrbahndecken mit Niveauregelung des Vorabstreifers
CN110158423B (zh) * 2019-06-10 2021-08-06 陕西专壹知识产权运营有限公司 水泥路面模板安装机

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2396426A (en) * 1941-07-05 1946-03-12 Jackson Corwill Machine or apparatus for placing concrete pavements and the like
US3354801A (en) * 1965-06-17 1967-11-28 Raymond A Hanson Highway slipform
DE3032495A1 (de) * 1980-08-28 1982-04-01 Heilit + Woerner Bau-AG, 8000 München Verfahren zur herstellung einer betonfahrbahndecke mit hilfe eines gleitschalungsfertigers und gleitschalungsfertiger zu durchfuehrung dieses verfahrens

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0186780A1 (fr) * 1984-12-27 1986-07-09 Dynapac Aktiebolag Dispositif pour disperser de l'adhésif bitumineux
EP0376692A3 (fr) * 1988-12-29 1991-07-17 David W. Somero Machine de revêtement et procédé
US6129481A (en) * 1998-03-31 2000-10-10 Delaware Capital Formation, Inc. Screed assembly and oscillating member kit therefor
US6152647A (en) * 1998-03-31 2000-11-28 Delaware Capital Formation, Inc. Screeding method incorporating oscillating member
US6183160B1 (en) 1998-03-31 2001-02-06 Delaware Capital Formation, Inc. Screeding apparatus and method incorporating oscillating attachment
US6929420B2 (en) 1998-10-27 2005-08-16 Delaware Capital Formation, Inc. Apparatus and method for three-dimensional contouring
US6227761B1 (en) 1998-10-27 2001-05-08 Delaware Capital Formation, Inc. Apparatus and method for three-dimensional contouring
US7144191B2 (en) 1998-10-27 2006-12-05 Somero Enterprises, Inc. Apparatus and method for three-dimensional contouring
USRE39834E1 (en) 1998-10-27 2007-09-11 Michigan Technological University Apparatus and method for three-dimensional contouring
US7399139B2 (en) 1998-10-27 2008-07-15 Somero Enterprises, Inc. Apparatus and method for three-dimensional contouring
US7311466B2 (en) 2004-07-06 2007-12-25 Somero Enterprises, Inc. Apparatus and method for subgrade preparation
GR1010235B (el) * 2021-06-16 2022-05-19 Χρηστος Γεωργιου Τζεκας Ιδιοκατασκευη διαμορφωσης και επενδυσης ταφρων με σκυροδεμα
CN120250748A (zh) * 2025-06-05 2025-07-04 山西省太原生态环境监测中心 一种河道底泥挖掘装置

Also Published As

Publication number Publication date
DE3367944D1 (en) 1987-01-15
DE3232020A1 (de) 1984-03-01
EP0102060A3 (en) 1985-05-02
EP0102060B1 (fr) 1986-11-26

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