US20110227241A1 - Machine and method for laying of a second concrete slab of a sleeperless rail-bed - Google Patents

Machine and method for laying of a second concrete slab of a sleeperless rail-bed Download PDF

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Publication number
US20110227241A1
US20110227241A1 US13/002,558 US200913002558A US2011227241A1 US 20110227241 A1 US20110227241 A1 US 20110227241A1 US 200913002558 A US200913002558 A US 200913002558A US 2011227241 A1 US2011227241 A1 US 2011227241A1
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Prior art keywords
concrete
slab
machine
slip
exit
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Abandoned
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US13/002,558
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English (en)
Inventor
Shachar Nave
Dan Tamir
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ASHTROM GROUP Ltd
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ASHTROM GROUP Ltd
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Priority to US13/002,558 priority Critical patent/US20110227241A1/en
Assigned to ASHTROM GROUP LTD. reassignment ASHTROM GROUP LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NAVE, SHACHAR, TAMIR, DAN
Publication of US20110227241A1 publication Critical patent/US20110227241A1/en
Abandoned legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B1/00—Ballastway; Other means for supporting the sleepers or the track; Drainage of the ballastway
    • E01B1/002—Ballastless track, e.g. concrete slab trackway, or with asphalt layers
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B29/00—Laying, rebuilding, or taking-up tracks; Tools or machines therefor
    • E01B29/005—Making of concrete parts of the track in situ
    • 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
    • E01C19/48—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 laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ
    • E01C19/4866—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 laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ with solely non-vibratory or non-percussive pressing or smoothing means for consolidating or finishing
    • E01C19/4873—Apparatus designed for railless operation

Definitions

  • This invention relates to slip-form paving machinery adapted for laying rail beds for trains.
  • rail beds Historically, rail beds consisted of two parallel steel rails, laid on cross ties (or sleepers; typically wood) embedded in ballast. Metal rails are then fastened to the ties with rail spikes, lag screws or clips.
  • the ballast was usually a bed of coarse stone chippings which provided resilience, limited flexibility, and drainage.
  • a baseplate is used between the rail and cross ties, to distribute the load of the rail over a larger area.
  • Spikes can be driven through a hole in the baseplate to hold the rail, or baseplates can be spiked or screwed to the cross tie (sleeper) and the rails clipped to the baseplate.
  • U.S. Pat. No. 7,325,316 describes a device for inserting elements into the ground in order to carry out works including a positioning mechanism.
  • An exemplary device described in this patent is marketed by Alstom Transport S.A. (Levallois-Perret, France) as part of the “Appitrack” system and can be used to inset baseplates into a concrete slab of a sleeperless track provided by a slip-form paving machine.
  • a broad aspect of the invention relates to automation of the process of laying rail beds for trains and/or trams.
  • 100, 125, 150, 175, 200, 225, 250 or 300 M/day of rail beds can be installed.
  • concurrent use of a slip-form paving machine and a base insertion machine contributes to increased efficiency.
  • the paving machine and a base plate inserter are subject to coordinated control.
  • the rail beds are laid in a previously prepared pavement (e.g. concrete or asphalt).
  • a wax layer is provided between the pavement and the rail bed.
  • One aspect of some exemplary embodiments of the invention relates to applying a positive pressure to force concrete backwards into a slip-form.
  • the positive pressure is created by closing a frontward facing portion of an exit port of a slip-form paving machine.
  • a level of concrete in a loading funnel of the paving machine contributes to a magnitude of the positive pressure.
  • reducing changes in concrete level in the loading funnel contributes to smoothness of a layer of concrete applied by the paving machine.
  • a degree of closing of the frontward facing portion of the exit port is variable.
  • variability is achieved with a movable shutter, for example a shutter controlled by a hydraulic mechanism.
  • the frontward facing portion of the exit port is partially opened in anticipation of an obstacle in a path of the paving machine.
  • a sprinkler apparatus is deployed to wet the sheet and/or uncured concrete emanating from an exit port of the slip-form machine.
  • sprinkling water on the concrete contributes to temperature control and/or smoothes the concrete.
  • formulations used in a paving machine provide an on-site slump value not exceeding 4 cm.
  • a slip-form machine for laying of a second concrete slab of a sleeperless rail-bed.
  • the machine includes:
  • the machine includes a feeder regulator adapted to maintain a height of concrete in the concrete feeder within predetermined limits.
  • the machine includes a pressure regulator adapted to maintain a hydrostatic pressure of concrete in the rearward exit within predetermined limits.
  • the machine includes a mounting bracket adapted to drag a flexible sheet over an upper surface of the uncured second concrete slab.
  • the mounting bracket is provided as a horizontal bar.
  • an aspect ratio (width to height) of the slip form is at least 10.
  • a method of paving a second concrete slab of a sleeperless rail-bed includes:
  • the method includes regulating a height of concrete in the concrete feeder.
  • the method includes regulating a height of concrete in the concrete feeder.
  • the method includes regulating a hydrostatic pressure of concrete in the rearward exit.
  • the method includes attaching a flexible sheet to the slip-form machine and dragging the flexible sheet over an upper surface of an uncured second concrete slab formed by the slip form machine.
  • the attaching includes attaching to a mounting bracket.
  • the mounting bracket is provided as a horizontal bar.
  • an aspect ratio (width to height) of the slip form is at least 10.
  • slump refers to a measure of a degree of plasticity of a fresh batch of concrete indicated by the Concrete Slump Test (ASTM C 143 and/or EN 12350-2 test standards). Briefly, slump is measured by filling an “Abrams cone” with a sample from a fresh batch of concrete. The cone is placed with the wide end down onto a level, non-absorptive surface and filled in three layers of equal volume, with each layer being tamped with a steel rod in order to consolidate the layer. When the Abrams cone is carefully lifted off, the enclosed sample slumps due to gravity.
  • Slump is expressed as a linear distance between a height of the Abrams cone and the height of the sample after the cone is removed. Slump is typically measured in the middle of a poring (e.g after 3 cubic meters have been disopensed from a 6 cubic meter mixer. Optionally, an additional slump test is performed at a beginning of a pour.
  • method refers to manners, means, techniques and procedures for accomplishing a given task including, but not limited to, those manners, means, techniques and procedures either known to, or readily developed from known manners, means, techniques and procedures by practitioners of engineering and/or computer science.
  • FIG. 1 is schematic representation of a transverse cross section of a sleeperless rail bed
  • FIG. 2 is schematic representation of a side view of a system for preparation of a sleeperless rail bed including a slip-form paving machine and a base plate inserter;
  • FIG. 3A is schematic representation of a lateral cross section of a slip-form paving machine according to an exemplary embodiment of the invention
  • FIG. 3B is an enlarged schematic representation of the area indicated as 221 in FIG. 3A ;
  • FIG. 4 is a simplified flow diagram of a method according to an exemplary embodiment of the invention.
  • Exemplary embodiments of the invention relate to machinery and methods for laying sleeperless rail beds.
  • some embodiments of the invention can be used to increase a rate at which rail beds are installed and/or reduce an amount of undesired cracking in a concrete slab of the rail beds and/or reduce fluctuations in upper surface height of an upper slab (e.g. relative to a lower support slab and/or in absolute terms).
  • FIG. 1 is a transverse cross section of a sleeperless rail bed 100 .
  • Rail bed 100 can be constructed using either “top-down” technology or slip-form technology. Exemplary embodiments of the invention described in this application are presented in the context of slip-form technology.
  • the finished rail bed 100 includes a first concrete slab 110 which serves as a support foundation.
  • a second concrete slab 120 is laid on top of the first slab and base plates 130 are attached to an upper surface thereof.
  • the base plates are installed in pairs at similar axial positions along second slab 120 .
  • a distance between two base plates 130 in a pair determines a distance between rails 140 which are subsequently attached thereto.
  • two second slabs 120 are depicted on a common first slab 110 .
  • three or four or more second slabs 120 can be provided on a common first slab 110 , for example in a train station.
  • thicknesses of slabs 110 and 120 and their widths can be adjusted in anticipation of projected weight loads and/or in consideration of geologic and/or soil conditions below slab 110 .
  • lateral and/or axial distances between base plates 130 can be adjusted in anticipation of expected use.
  • rails for different types of urban transport systems may be spaced to accommodate cars with a width of 2.5, 2.7 or 3.2 M or lesser or intermediate or greater values.
  • wider rail cars are suited for higher speed travel and/or larger payloads.
  • FIG. 2 is a side view of a system 200 for preparation of a sleeperless rail bed of the general type indicated in FIG. 1 including a slip-form paving machine 220 and a base plate inserter 230 .
  • First concrete slab 110 can be laid using either slip-form technology or conventional “constructed form” technology.
  • the large arrow indicates a direction of travel of slip-form paving machine 220 and base plate inserter 230 which are propelled by locomotion means 222 and 232 respectively.
  • the locomotion means may be, for example metal treads of the type commonly employed on tanks and bulldozers and/or tires.
  • the locomotion means are typically, but not always, powered by internal combustion engines.
  • slip-form machine 220 axially translates itself (leftward in the figure) along first slab 110 by locomotion means 222 and concurrently paves second slab 120 onto an upper surface thereof. Because second slab 110 will support base plates 130 which support rails 140 (see FIG. 1 ), an upper surface of slab 120 must be engineered within close tolerances so that it is flat in both transverse and axial dimensions.
  • base plate inserter 230 axially translates itself (leftward in the figure) along first slab 110 by locomotion means 232 and concurrently inserts base plates 130 in an upper surface of second slab 120 . Any deviation of second slab 120 from engineering tolerances can cause cracking of the second slab and/or unacceptable bending of rails 140 when they are affixed to base plates 130 .
  • Some exemplary embodiments relate to mechanical modifications of slip form machine 220 .
  • these modification reduce cracking of slab 120 and/or improve adherence to engineering tolerances.
  • FIG. 3A is a schematic representation of a lateral cross section of slip-form paving 220 machine according to an exemplary embodiment of the invention through line A-A of FIG. 2 .
  • a housing, frame or chassis 320 indicated generally as a rectangle physically which connects components of machine 220 .
  • Depicted exemplary slip-form machine 220 is adapted for laying second concrete slab 120 of sleeperless rail-bed 100 .
  • Depicted machine 220 includes a locomotion mechanism 222 adapted to provide axial translation of the machine along first concrete slab 110 as described hereinabove with regard to FIG. 2 . For clarity, mechanism 222 is omitted from FIG. 3 .
  • Depicted machine 220 also includes a concrete feeder 330 having an intake port 332 and a discharge port 336 .
  • Discharge port 336 has a forward exit 338 facing in the direction of axial translation and a rearward exit 340 .
  • Depicted machine 220 includes a slip-form 370 adapted to receive concrete 334 exiting discharge port 336 via rearward exit 340 .
  • Concrete 334 forms an uncured second concrete slab 120 as machine 220 continues axial translation along first slab 110 .
  • a cover 350 covers forward exit 338 .
  • cover 350 is operably connected to a height adjustment mechanism operable to adjust a height of cover 350 with respect to an upper surface 310 of first concrete slab 110 .
  • the height adjustment mechanism is represented schematically as controller 360 .
  • controller 360 includes electronic and/or hydraulic and/or mechanical components which move cover 350 in response to an input signal.
  • the input signal is provided manually (e.g. via a lever or button) or automatically (e.g. via a sensor, not pictured).
  • FIG. 3 B schematically depicts inset 221 in greater detail.
  • cover 350 includes a stationary element 350 which supports a movable element 351 .
  • Movable element 351 is optionally raised and lowered relative to upper surface 310 of the first slab, for example in response to a control signal from controller 360 ( FIG. 3A ).
  • stationary element 350 extends downwards to the level of upper surface 311 of second slab 120 .
  • movable element 351 can have different ranges of motion relative to a lower edge of stationary element 350 and/or upper surface 310 of the first slab. Exemplary dimensions are described below.
  • machine 220 includes a feeder regulator adapted to maintain a height (h) of concrete 334 in concrete feeder 334 within predetermined limits.
  • the feeder regulator optionally relies upon adjusting a height of cover 350 via controller 350 and/or controlling a flow rate of incoming concrete 394 from mouth 392 of a concrete pump 390 .
  • the feeder regulator is manually operable (e.g. via a lever or button) or automatic (e.g. responsive to an output signal from a pressure sensor installed at 380 ).
  • Numeral 380 schematically represents a vibrator provided to remove air from concrete 334 as it flows through feeder 330 . Although one vibrator 380 is depicted for clarity, a larger number are typically employed. Optionally, 4, 6, 8, 12 or 16 vibrators are employed. In some exemplary embodiments of the invention, the number of vibrators employed varies with cross sectional area of feeder 330 and/or with a height of mouth 392 of pump 390 and/or with concrete composition.
  • machine 220 includes a pressure regulator adapted to maintain a hydrostatic pressure of concrete 334 in rearward exit 340 within predetermined limits.
  • the pressure regulator works by controlling h and/or a degree of opening of cover 350 .
  • a degree of deviation from flatness of upper surface 311 in the axial and/or transverse dimensions is reduced by controlling height of concrete 334 in feeder 330 and/or a degree of opening of cover 350 and/or hydrostatic pressure in rearward exit 340 .
  • a degree of deviation from flatness of upper surface 311 is alternatively or additionally reduced by dragging a flexible sheet 380 behind machine 220 along upper surface 311 of second slab 120 .
  • a mounting bracket 382 is adapted to drag flexible 380 .
  • a specer bar 384 holds bracket 384 at a desired distance from housing 320 .
  • mounting bracket 384 is provided as a horizontal bar, optionally transverse to upper surface 311 of second slab 120 .
  • FIG. 4 is a simplified flow diagram 400 of a method of laying a second slab of a sleeperless rail-bed according to exemplary embodiments of the invention.
  • a slip-form machine is caused 410 to axially translate along a first concrete slab.
  • Concurrently concrete is fed 420 concrete into a concrete feeder having an intake port and a discharge port.
  • the discharge port includes a forward exit facing in a direction of the axial translation and a rearward exit.
  • method 400 includes at least partially covering 430 the forward exit so that concrete exits the discharge port via the rearward exit with sufficient pressure to fill a slip-form positioned behind the rearward exit.
  • method 400 includes adjusting 440 a height of a cover of the forward exit with respect to the first concrete slab.
  • the height can be adjusted, for example, by controller 360 as described above.
  • method 400 includes regulating 460 a height h ( FIG. 3A ) of concrete in the concrete feeder.
  • regulating 460 is at least partially achieved by adjusting 440 .
  • method 400 includes regulating 450 a hydrostatic pressure of concrete in the rearward exit.
  • adjusting 440 and/or regulating 460 contribute to regulating 450 .
  • method 400 includes attaching 470 a flexible sheet to the slip-form machine and dragging 480 the flexible sheet over an upper surface of the uncured second concrete slab.
  • attaching includes attaching to a mounting bracket, optionally provided as a horizontal bar.
  • Concrete pumps suitable to provide concrete 394 to feeder 330 are commercially available from, for example, Schwing America Inc. (St. Paul Minn., USA).
  • Schwing America Inc. St. Paul Minn., USA.
  • One of ordinary skill in the art will be able to incorporate commercially available concrete pumps into the context of the invention without undue experimentation.
  • Slip-form paving equipment as depicted in FIG. 2 is available commercially, for example from HEM (Grundy Center Iowa; USA) and from Caterpillar (Peoria Ill., USA).
  • HEM Green Center Iowa
  • Caterpillar Caterpillar
  • cover 350 AP controller 360 and/or mounting bracket 382 and/or spacer bar 384 One of ordinary skill in the art will be able to modify commercially available equipment with cover 350 AP controller 360 and/or mounting bracket 382 and/or spacer bar 384 using the above description as a guide and implementing routine calibration.
  • Hydraulic actuators suitable for use in controller 360 are available from, for example, TYCO/flow control (Bridgeport N.J., USA).
  • TYCO/flow control Bridgeport N.J., USA.
  • One of ordinary skill in the art will be able to select a suitable commercially available actuator and incorporate it into the context of the invention without undue experimentation.
  • cracking of upper surface 311 of second slab 120 is reduced by controlling a degree of flatness thereof.
  • stress upon and/or bending of rails 140 is reduced by controlling a degree of flatness of upper surface 311 of second slab 120 .
  • height of upper surface 311 is restricted to ⁇ 7, 5, 3, 2 or 1 mm of a planned absolute height for the same location (or lesser or intermediate values) of transverse width ( FIG. 1 ).
  • stationary element 350 extends downwards to a height above upper surface 310 of the first slab equivalent to a thickness of the second slab.
  • stationary element 350 extends downwards to a greater degree.
  • an increased degree of downward extension enables element 350 to impart a greater degree of support to element 351 against pressure of concrete at frontward facing exit 338 .
  • movable element 351 has different ranges of motion such as, for example, 5, 10, 15 or 20 cm or intermediate values.
  • the range of motion is about 15 cm.
  • movable element 351 is configured to descend about 15 cm below a bottom edge of stationary element 350 .
  • this provides a clearance of about 8 cm with respect to upper surface 310 of the first slab.
  • a degree of clearance provided for movable element 351 varies with one or more of concrete composition (e.g. softness) and/or variability of terrain.
  • movable element 351 and stationary element 350 are constructed of rigid materials (e.g. steel).
  • movable element 351 and stationary element 350 are characterized by a thickness of 10, 12, 15, 15 or 20 mm.
  • a second slab of 1500, 1750, 2000, 2250, 2500, 2750 or 3000 mm is desired to accommodate a track width dictated by selected rolling stock.
  • a single slip form paving machine can be fitted with forms of different widths in accord with the demands of a specific paving job.
  • widths of movable element 351 and/or stationary element 350 can be adjusted as need to conform to relevant forms.
  • a desired thickness of second slab 120 can vary with ground type and/or anticipated load demands.
  • a slab thickness of 23 cm has been selected as suitable.
  • softer ground contributes to increased slab thickness.
  • slab height is subject to a tolerance of ⁇ 5 mm or less.
  • a distance between base plates 130 can be 600, 650, 700, 750, 800, 850 or 900 mm or intermediate or greater values.
  • base plate spacing varies with one or more of slab thickness, anticipated loads and ground type.
  • second slab 120 is characterized by an aspect ratio (width to height) of 50, 40, 150, 20, 12, 11, 10, or 8 or intermediate values.
  • the aspect ratio is about 10.9.
  • features used to describe a method can be used to characterize an apparatus and features used to describe an apparatus can be used to characterize a method.
  • Table 1 summarizes the relative amounts of ingredients for summer and winter formulations in comparison to typical concrete formulations for manual application.
  • Table 1 shows slump data, tensile strength and compression strength data where available.
  • Formulation type Component Machine Machine (amount in Kg) Manual (Summer) (Winter) range Washed sand 0/2 330 420 560 ⁇ 3% Graded sand 2/9 550 540 460 ⁇ 3% ADS shapir 10/14 290 490 450 ⁇ 3% Folia shaper 14/24 630 460 420 ⁇ 3% Cement AM 42.5 390 340 330 ⁇ 3% Water 160 188 150 ⁇ 3% LP201 003.7 002.72 001.65 ⁇ 5% Average slump at plant (cm) 15 6 6 na Indirect tensile strength after 28 nd 4.17 3.9 na days; 15 ⁇ 30 cm cylinder (MPa) Indirect tensile strength after 28 nd 5.88 nd na days; 10 ⁇ 10 ⁇ 10 cm cube (MPa) compression strength after 28 nd 55.9 57.3 na days; 15 ⁇ 30 cm cylinder (MPa) compression strength after 28 58.5 59.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Paving Machines (AREA)
  • Road Paving Structures (AREA)
US13/002,558 2008-07-08 2009-07-08 Machine and method for laying of a second concrete slab of a sleeperless rail-bed Abandoned US20110227241A1 (en)

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US13/002,558 US20110227241A1 (en) 2008-07-08 2009-07-08 Machine and method for laying of a second concrete slab of a sleeperless rail-bed

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US12961008P 2008-07-08 2008-07-08
US13/002,558 US20110227241A1 (en) 2008-07-08 2009-07-08 Machine and method for laying of a second concrete slab of a sleeperless rail-bed
PCT/IL2009/000680 WO2010004559A1 (en) 2008-07-08 2009-07-08 Machine and method for laying of a second concrete slab of a sleeperless rail-bed

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EP (1) EP2310572A1 (zh)
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130051914A1 (en) * 2010-04-16 2013-02-28 Joseph Vogele Ag Feeder
US10640937B2 (en) 2013-11-27 2020-05-05 Howard Cooper System and method for slip forming concrete barriers
US11008714B2 (en) 2018-04-09 2021-05-18 Howard Cooper Slip forming structures using multiple molds

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112878119B (zh) * 2020-04-13 2023-01-17 北京易科路通铁道设备有限公司 道床基底施工方法

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US20030189265A1 (en) * 2002-04-08 2003-10-09 Consolis Technology Oy Ab Method for casting a concrete product
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US6926851B2 (en) * 2001-10-31 2005-08-09 Specialty Minerals (Michigan) Inc. Method, composition and apparatus for controlled concrete
US6962490B2 (en) * 2003-08-27 2005-11-08 Norman John Garden Concrete extruder attachment for a vehicle
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US7004737B2 (en) * 2001-08-20 2006-02-28 Matthew Russell Methods and apparatus for forming concrete structures
US7108449B1 (en) * 2002-06-14 2006-09-19 Allen Engineering Corporation Method and apparatus for acoustically matched slip form concrete application
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US3957405A (en) * 1974-05-28 1976-05-18 A. C. Aukerman Co. Slip form having hinged gate means
US6872028B2 (en) * 2001-06-13 2005-03-29 Wirtgen Gmbh Slip form paver
US7004737B2 (en) * 2001-08-20 2006-02-28 Matthew Russell Methods and apparatus for forming concrete structures
US6926851B2 (en) * 2001-10-31 2005-08-09 Specialty Minerals (Michigan) Inc. Method, composition and apparatus for controlled concrete
US6998075B2 (en) * 2002-01-30 2006-02-14 Addtek Research & Development Oy Ab Method for casting of concrete products
US6878315B2 (en) * 2002-02-01 2005-04-12 Consolis Technology Oy Ab Method and apparatus for casting a concrete product
US20030189265A1 (en) * 2002-04-08 2003-10-09 Consolis Technology Oy Ab Method for casting a concrete product
US6969476B2 (en) * 2002-04-08 2005-11-29 Consolis Technology Oy Ab Method for casting a concrete product
US7108449B1 (en) * 2002-06-14 2006-09-19 Allen Engineering Corporation Method and apparatus for acoustically matched slip form concrete application
US6962490B2 (en) * 2003-08-27 2005-11-08 Norman John Garden Concrete extruder attachment for a vehicle
US7325316B2 (en) * 2006-02-09 2008-02-05 Alstom Transport Sa Device and method for inserting elements into the ground, mechanism for this device and system using this device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130051914A1 (en) * 2010-04-16 2013-02-28 Joseph Vogele Ag Feeder
US10640937B2 (en) 2013-11-27 2020-05-05 Howard Cooper System and method for slip forming concrete barriers
US11248352B2 (en) 2013-11-27 2022-02-15 Howard Cooper System and method for slip forming concrete barriers
US11008714B2 (en) 2018-04-09 2021-05-18 Howard Cooper Slip forming structures using multiple molds

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WO2010004559A1 (en) 2010-01-14
CN102131983A (zh) 2011-07-20

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