US3709116A - Slip-form paving machines - Google Patents

Slip-form paving machines Download PDF

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Publication number
US3709116A
US3709116A US00119089A US3709116DA US3709116A US 3709116 A US3709116 A US 3709116A US 00119089 A US00119089 A US 00119089A US 3709116D A US3709116D A US 3709116DA US 3709116 A US3709116 A US 3709116A
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United States
Prior art keywords
datum
conforming member
conforming
machine
sensing
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Expired - Lifetime
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US00119089A
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English (en)
Inventor
J Whitbread
R Attwell
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British Railways Board
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British Railways Board
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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
    • E01B27/00—Placing, renewing, working, cleaning, or taking-up the ballast, with or without concurrent work on the track; Devices therefor; Packing sleepers
    • E01B27/02—Placing the ballast; Making ballastway; Redistributing ballasting material; Machines or devices therefor; Levelling means
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B27/00—Placing, renewing, working, cleaning, or taking-up the ballast, with or without concurrent work on the track; Devices therefor; Packing sleepers
    • E01B27/02—Placing the ballast; Making ballastway; Redistributing ballasting material; Machines or devices therefor; Levelling means
    • E01B27/023—Spreading, levelling or redistributing ballast already placed
    • E01B27/025—Spreading, levelling or redistributing ballast already placed by means of non-driven tools
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B35/00—Applications of measuring apparatus or devices for track-building purposes
    • 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
    • E01C19/004—Devices for guiding or controlling the machines along a predetermined path
    • E01C19/008—Devices for guiding or controlling the machines along a predetermined path by reference lines placed along the road, e.g. wires co-operating with feeler elements
    • 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
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/76—Graders, bulldozers, or the like with scraper plates or ploughshare-like elements; Levelling scarifying devices
    • E02F3/80—Component parts
    • E02F3/84—Drives or control devices therefor, e.g. hydraulic drive systems
    • E02F3/841—Devices for controlling and guiding the whole machine, e.g. by feeler elements and reference lines placed exteriorly of the machine
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/76—Graders, bulldozers, or the like with scraper plates or ploughshare-like elements; Levelling scarifying devices
    • E02F3/80—Component parts
    • E02F3/84—Drives or control devices therefor, e.g. hydraulic drive systems
    • E02F3/844—Drives or control devices therefor, e.g. hydraulic drive systems for positioning the blade, e.g. hydraulically
    • E02F3/845—Drives or control devices therefor, e.g. hydraulic drive systems for positioning the blade, e.g. hydraulically using mechanical sensors to determine the blade position, e.g. inclinometers, gyroscopes, pendulums
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B2203/00—Devices for working the railway-superstructure
    • E01B2203/14—Way of locomotion or support
    • E01B2203/145—Way of locomotion or support on the ballast
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B2203/00—Devices for working the railway-superstructure
    • E01B2203/14—Way of locomotion or support
    • E01B2203/146—Way of locomotion or support using other means than driven wheels as propulsion means
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B2203/00—Devices for working the railway-superstructure
    • E01B2203/16—Guiding or measuring means, e.g. for alignment, canting, stepwise propagation

Definitions

  • ABSTRACT A surface forming machine has a conformingmember for conforming a surface of a roadway. which is adjustable laterally of the machine.
  • a sensing device is mounted for lateral movement with the conforming member for sensing a datum controlling the lateral position 'of the conforming member.
  • Actuating means cause lateral adjustment of the conforming member to maintain the sensing device centered with respect to the datum.
  • Programmed control means driven in synchronism with the movement of the machine along the roadway cause movement of the sensing device laterally relatively to the conforming member, whereby the consequent lateral adjustment of the conforming member by the actuating means to restore the sensing device to its centered position with respect to the datum varies the relationship between the lateral position of the conforming member and the datum.
  • Similar sensing devices and programmed control means can be provided for controlling the vertical height and transverse and longitudinal attitudes of the conforming member.
  • FIGS SHEET 3 OF 5 FIGS SHEET 4 BF 5 QUE l SLIP-FORM PAVING MACHINES This invention relates to surface forming machines, and more particularly, but not exclusively, to slip-form paving machines for laying cement-concrete. Other applications of the invention are in graders and other earthmoving equipment in which it is required to provide an accurately level or contoured surface along a predetermined route.
  • Slip-form paving machines are used in constructing motor roads and more recently in constructing rail roads by laying concrete slab foundations for supporting the rails of railway track. Machines of this kind are provided with a conforming plate which conforms the top surface of the cement-concrete layer to a desired level and profile.
  • the object of the invention is to provide a surface forming machine such as a slip-form paving machine which has a control system such that the preparatory surveying operation can be less onerous.
  • a surface forming machine comprising, a conforming member for conforming a surface of a roadway as the machine moves along the roadway and which is adjustable laterally of the machine, sensing means mounted for lateral movement with the conforming member for sensing a datum controlling the lateral position of the conforming member asthe machine moves along the roadway, actuating means for causing lateral adjustment of the conforming member to maintain the sensing means centered with respect to the datum, and programmed control means arranged to be driven in synchronism with the movement of the machine along the roadway for moving the sensing means laterally relatively to the conforming member, whereby the consequent lateral adjustment of the conforming member by the actuating means to restore the sensing means .to its centered position with respect to the datum varies the relationship between the lateral position of the conforming member and the datum.
  • the sensing means may comprise a photocell arrangement and the datum line can then conveniently be provided by a laser-beam.
  • FIG. I shows a rear elevation of the first machine construction
  • FIG. 2 shows a sectional side elevation of the machine
  • FIG. 3 is a diagram illustrating the operation of the machine
  • FIG. 4 is a perspective view of the conforming plate of the machine illustrating the datum sensing units mounted thereon
  • FIG. 5 illustrates the adjustability of a representative one of the datum sensing unit relatively to the conforming plate
  • FIG. 6 illustrates the programmed control system for adjusting the datum sensing units relatively to the conforming plate.
  • FIG. 7 is a view illustrating the lateral positioning system for the conforming plate of the second machine construction.
  • FIG. 8 is a view illustrating the vertical positional control of the conforming plate and the horizontal and vertical adjustment of the sensing means relatively to the conforming plate of the second machine construction.
  • the slip-form paving machine in accordance with the first construction comprises a vehicle running on caterpillar tracks 1 and having a power generating unit 2 and a drivers cab 3.
  • the machine is motor driven in conventional manner.
  • the power generating unit 2 and the cab 3 are supported on cross-tubes 4 and 5 which are extensible in order to vary the width of the machine.
  • the ends of the crosstubes 4 and 5 are mounted in side-beams 6 and 7 which are supported-through hydraulic jacks 8 and 9 on side structures 10 and 11.
  • the side structures 10 and 11 are similar and are supported from the axles of the track wheels 12 and 13 on each side'of the machine.
  • a conforming plate 15 is suspended from the crosstubes 4 and 5 by arms 14, the suspension arrangement enabling a controlled lateral movement of the conforming plate relative to the tracks I by hydraulic jack 16 connected between the conforming plate and the side structure 11.
  • the height of the conforming plate 15 can be controlled by simultaneous raising or lowering of the four jacks 8 and 9.
  • the attitude, i.e., level or cant, of the conforming plate 15 transversely of the machine can be controlled by differential operation of the jacks 8 and 9.
  • the longitudinal attitude of the conforming plate 15 can be controlled by differential operation of the rear jacks 8 and 9 and the front jacks 8 and 9. If the width of the machine is altered by adjustment of the cross-tubes 4 and 5, then the conforming plate 15 is changed for one appropriate to the new width of the machine.
  • the basic lateral positioning and height control of the conforming plate is from datum wire 18 laid alongside the surveyed route which the machine is to follow.
  • the datum wire 18 is stretched taut between supporting posts 19 (FIG. 3) so that on a curve in the route it forms a series of chords 20 to the curve 21 parallel to the desired curve 22 for the adjacent edge of the concrete bedfihe height of the datum wire 18 is set so that it follows any desired gradients which are to be incorporated in the upper surface of the concrete bed.
  • the tracks 1 of the machine are automatically steered from the datum wire 18 in conventional manner so that the machine follows with a somewhat coarse accuracy the desired route of the concrete bed. Having provided this coarse steering the fine control is provided by controlled lateral positioning and height adjustment of the conforming plate 15.
  • forked probe 25 embracesthe datum wire 18 for lateral positional control
  • forked probe 26 embraces the datum wire 18 for height control.
  • the probes 25 and 26 are mounted at the ends of cranked lever arms 27 and 28 pivotally mounted at 29 and 30 on the conforming plate 15 and carrying short cross-bars 31 and 32 at their ends adjacent the conforming plate 15.
  • cross-bar 31 is sensed by a sensing unit 35 and the movement of cross-bar 32 is sensed by a similar sensing unit 36.
  • Each sensing unit as clearly shown in FIG. comprises a pair of parallel air jets, one jet flowing between pipes 37 and 38 and the other jet flowing between pipes 39 and 40.
  • the cross-bars 31 and 32 are centered between the air jets of the sensing units 35 and 36.
  • the cross-bar 31 intercepts one or other of the air jets and this causes an output signal from the sensing unit 35 which causes operation of the jack 16 to move the conforming plate 15 laterally in the correct sense to re-center the cross-bar 31 between the air jets.
  • relative vertical movement between the conforming plate 15 and datum wire 18 will cause an output signal from the sensing unit 36 to cause operation of the jacks 8 and 9 to move the conforming plate 15' vertically in the correct sense to re-center cross-bar 32 between the air jets of sensing unit 36.
  • the transverse attitude control of the conforming plate is effected by a similar sensing unit 41, which senses the position of a cross-bar 42 mounted at the lower end of a pendulum 43 pivoted at 44 on the conforming plate 15.
  • the cross-bar 42 is centered between the air jets when the conforming plate is horizontal and departure of the conforming plate from the horizontal will cause the cross-bar 42 to intercept one or other of the air jets.
  • This causes the sensing unit 41 to produce an output signal to actuate the jacks 8 on one side or the jacks 9 on the other side of the machine to re-center the cross-bar 42.
  • a programmed control system is therefore provided so that as the machine proceeds along the route a series of offsetting control movements relative to the datum wire 18 are fed to the conforming plate 15 and the lateral position of the conforming plate 15 therefore follows the shorter chords 46.
  • the programmed control for the lateral positioning of the conforming plate 15, is achieved. by a programmed adjustment of the sensing unit 35, i.e., of the parallel air jets, about the pivot 29, so that the consequent lateral movement of the conforming plate to maintain the cross-bar 31 centered between the jets will cause the necessary offsetting movement of the conforming platerelatively to the datum .wire 18.
  • the programmed control of the vertical positioning of the conforming plate 15 is similarly achieved by a programmed adjustment of the sensing unit 36 about pivot 30.
  • a similar programmed control of the lateral attitude of the conforming plate 15 can be achieved by programmed adjustment of the sensing unit 41 about pivotal axis 44 so that as the machine proceeds along the track, the consequent canting of conforming plate 15 produces the required cant or banking of the concrete bed.
  • the pipes 37 to 40 of the sensing unit 35 producing the two air jets are mounted on frame members 48 and 49 secured to quadrant member 50.
  • Member 50 is mounted on a shaft 51 of an electric motor 52, the motor shaft 51 lying on pivot axis 29 for the lever arm 27 so that energization of the motor causes rotation of the sensing unit 35 about axis 29.
  • the energization of the motor 52 is controlled by a timer 54, the electric motor being geared so as to allow the shaft 51 to rotate through a very small movement over a period of seconds.
  • the control of the motor 52 via timer 54 is from a punched tape 55 having two channels, one for controlling rotational movement of senser unit 35 in one direction and the other controlling rotation of senser unit 35 in the opposite direction.
  • the punched tape 55 is driven from spool 56 to spool 57 in synchronism with the movement of the machine and passes through sensor head 58 for one channel and sensor head 59 for the other channel.
  • the sensor heads 58 and 59 each comprise aligned air pipes 60 and 61, the sensor head 58 being supplied with air along line 62 and the sensor head 59 being supplied with air along line 63.
  • each sensor head creates a jet of air from its pipe 60 which is obstructed by the tape except when a punched hole lies between the pipes 60 and 61.
  • the air jet is detected by pipe 61 and causes an air signal or pulse to pass through to pressure sensitive unit 64 in the case of sensor head 58 and to pressure sensitive unit 65 in the case of sensor head 59.
  • Rotation of the sensor unit 35 for example clockwise as seen in FIG. 5 will cause the cross-bar 31 to intercept the left hand air jet between pipes 37 and 38 and this will be detected by pressure sensitive switch 66.
  • Pressure sensitive switch 66 thus produces an electrical output signal which energizes a solenoid operated valve to actuate hydraulic jack 16 and thus move the conforming plate in the direction so that the sensing unit 35 is moved to re-centralize the cross-bar 31 between the air jets.
  • anti-clockwise movement of the sensor unit 35 will be detected by pressure sensitive switch 67, causing a consequential lateral movement of the conforming plate 15 so that the crossbar is re-centered between the air jets of sensor unit 35.
  • the programmed control system for the sensor units 36 and 41 will be the same resulting in pressure sensitive switches corresponding to switches 66 and 67 producing the required control of jacks 8 and 9.
  • the programmed control for the three sensing units 35, 36 and 41 is advantageously from a single tape with the appropriate number of channels, i.e. the appropriate number of lines of punched holes. A further channel or channels may provide a zeroing function so that back lash in the motor 52 may be counteracted.
  • the movement of the tape 55 is synchronized to the movement of the machine.
  • the tape drive to provided with a zeroing device 68 which allows the tape 55 to be driven so far and then cuts out the drive by operation of micro-switch 69.
  • the drive of the tape cannot be re-started until the machine passes one of series of reference points for example on the datum wire 18.
  • the microswitch 69 will be operated at precisely the same time as the machine passes the reference point so that there is no significant interruption in the tape drive.
  • FIGS. 7 and 8 the general construction of the slip form paving machine may be as shown in FIGS. 1 and 2.
  • the slip-form paving machine has a conforming plate 71 which skims the surface of the cement-concrete mix and which can be adjusted horizontally laterally of the machine by hydraulic ram connection 72 between the main body 73 of the machine and the conforming plate 71.
  • Coarse guidance of the machine and hence of the conforming plate 71 is effected by guide wire 74 which is sensed by conventional probe 75. Since the guide wire 74 need only provide coarse guidance it need not be positioned with a high degree of accuracy and this minimizes surveying time.
  • the high accuracy, or fine control of the conforming plate 71 is through laser-beam 76 projecting from a pedestal mounted laser and shining onto sensing means in the form of a split photocell 77 mounted on the conforming plate 71.
  • the photocell 77 is adjustable vertically and horizontally I relatively to the conforming plate by hydraulic rams 78 and 79 respectively.
  • the setting of the photocell 77 relative to the conforming plate 71 is purposely varied by actuating rams 78 and/or 79 consequent adjustment of the conforming plate 71 by jacks 72 and/or 80 to re-centralize the laser-beam 76 on the photocell 77 will vary the relationship between the beam 76 and the conforming plate 71.
  • the actuation of rams 78 and 79 is controlled from a punched paper tape using fluidic control the conforming plate 71 can be made to follow a predetermined curved path relatively to a straight laser-beam.
  • a surface forming machine comprising, a conforming member for conforming a surface of a roadway as the machine moves along the roadway and which is adjustable along at least one direction relative to the machine, at least one follower means mounted for movement with the conforming member along said one direction for sensing a datum, sensing means responsive to said follower means to control the position along said one direction of the conforming member as the machine moves along the roadway and being effective thereby to maintain the follower means centered with respect to the datum, and programmed control means arranged to be driven in synchronism with the movement of the machine along the roadway for moving the sensing means along said one direction relatively to the conforming member, whereby the consequent adjustment of the conforming member by the sensing means to restore the follower means to its centered position with respect to'the datum follower means varies the relationship between the position of theconforming member and the datum.
  • sensing means provides a pair of parallel air jets between which said datum follower means is centered, interception of either of said air jets by said datum follower means causing lateral adjustment of the conforming member by said sensing means to re-center the datum follower means between the air jets.
  • the third sensing means provides a pair of 7 parallel air jets between which the pendulum is centered, interception of either of said air jets by the pendulum causing adjustment of the transverse attitude of said conforming member to re-center the pendulum between the air jets.
  • the conforming member comprises a plate adapted to conform a surface of a roadway by engagement of one of its'faces with the surface and is variable in its attitude longitudinally of the machine, and wherein fourth datum follower means are mounted for movement with the conforming member for sensing a datum determining the longitudinal attitude of the conforming member, fourth sensing means arranged to tilt the conforming member longitudinally of the machine to maintain the fourth datum follower means centered with respect to the datum, and fourth programmed control means arranged to move "the fourth sensing means relatively to the conforming member, whereby the consequent longitudinal tilting movement of the conforming member to restore the fourth datumfollower means to its centered position with respect to said fourth datum follower means causes it to vary its longitudinal attitude with respect to said datum.
  • said fourth datum follower means comprises a pendulum suspended to swing longitudinally of the conforming member and whose displacement in either direction from the vertical is detected by said fourth sensing means.
  • a surface forming machine as claimed in claim 10 wherein the tape is arranged to be driven in synchronism with the machine for a predetermined distance and is then stopped until an external zeroing signal is applied to recommence the tape drive.
  • actuating means comprise hydraulic jacks controlled through solenoid operated valves by said sensing means.
  • a surface forming machine comprising, a conforming member for conforming a surface of a roadway as the machine moves along the roadway and which is adjustable relative to the machine, datum follower means mounted for movement relative to the conformits centered position with respect to the datum varies the relationship between the position of the conforming member and the datum in accordance with a predetermined program, the programmed control means being co-operable with control means spaced at intervals along the roadway to maintain the program in synchronism with the movement of the machine along the roadway.

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  • Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • General Engineering & Computer Science (AREA)
  • Soil Working Implements (AREA)
  • Road Paving Machines (AREA)
US00119089A 1970-03-02 1971-02-26 Slip-form paving machines Expired - Lifetime US3709116A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9814/70A GB1285438A (en) 1970-03-02 1970-03-02 Improvements relating to surface forming machines such as slip-form paving machines

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US3709116A true US3709116A (en) 1973-01-09

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US00119089A Expired - Lifetime US3709116A (en) 1970-03-02 1971-02-26 Slip-form paving machines

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US (1) US3709116A (enExample)
AU (1) AU2603771A (enExample)
BE (1) BE763673A (enExample)
CA (1) CA931799A (enExample)
DE (1) DE2109691A1 (enExample)
FR (1) FR2081631B1 (enExample)
GB (1) GB1285438A (enExample)
IL (1) IL36332A0 (enExample)
NL (1) NL7102708A (enExample)
SU (1) SU403205A3 (enExample)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3873226A (en) * 1973-07-11 1975-03-25 Laserplane Corp Laser beam control system for road paving machines
US3896989A (en) * 1972-06-09 1975-07-29 Engelhard Min & Chem Pavement grooving machine including a cutting blade guidance system
US4526493A (en) * 1983-05-26 1985-07-02 H. H. H. Concrete Paving Co. Slip-forming machine and process for laying concrete mix adjacent to plastic concrete mix
US4678364A (en) * 1985-03-14 1987-07-07 VIAFRANCE and State of France as represented by the Ministry of Urban Planning, Housing and Transportation, Central Laboratory of Roads and Bridges Tractor-drawn forming tool for making concrete slabs on the ground
US4778305A (en) * 1987-03-27 1988-10-18 Rexworks Inc. Slip-form paver with laterally moveable paving tool
EP0477024A1 (en) * 1990-09-20 1992-03-25 Ray F. Haid Adjustable screed and adjustment means therefor
US5336019A (en) * 1993-05-10 1994-08-09 Hollon Edmund D Uniform compaction of asphalt concrete
US5924819A (en) * 1998-01-23 1999-07-20 Caterpillar Paving Products Linkage mechanism for an extendable asphalt paver screed
US6109825A (en) * 1999-05-26 2000-08-29 Power Curbers, Inc. Paving apparatus with automatic mold positioning control system
US6692185B2 (en) 2001-10-17 2004-02-17 Power Curbers, Inc. Adjusting arrangement for steerable transport assembly for self-propelled construction vehicle
US6715957B2 (en) 2001-10-17 2004-04-06 Power Curbers, Inc. Paving apparatus with retractable pavement forming assembly
US20160177519A1 (en) * 2014-12-19 2016-06-23 Wirtgen Gmbh Frame Distortion Control

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AT336065B (de) * 1975-02-07 1977-04-12 Plasser Bahnbaumasch Franz Bezugssystemanordnung fur gleisbaumaschinen

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3896989A (en) * 1972-06-09 1975-07-29 Engelhard Min & Chem Pavement grooving machine including a cutting blade guidance system
US3873226A (en) * 1973-07-11 1975-03-25 Laserplane Corp Laser beam control system for road paving machines
US4526493A (en) * 1983-05-26 1985-07-02 H. H. H. Concrete Paving Co. Slip-forming machine and process for laying concrete mix adjacent to plastic concrete mix
US4678364A (en) * 1985-03-14 1987-07-07 VIAFRANCE and State of France as represented by the Ministry of Urban Planning, Housing and Transportation, Central Laboratory of Roads and Bridges Tractor-drawn forming tool for making concrete slabs on the ground
US4778305A (en) * 1987-03-27 1988-10-18 Rexworks Inc. Slip-form paver with laterally moveable paving tool
EP0477024A1 (en) * 1990-09-20 1992-03-25 Ray F. Haid Adjustable screed and adjustment means therefor
US5336019A (en) * 1993-05-10 1994-08-09 Hollon Edmund D Uniform compaction of asphalt concrete
US5924819A (en) * 1998-01-23 1999-07-20 Caterpillar Paving Products Linkage mechanism for an extendable asphalt paver screed
US6109825A (en) * 1999-05-26 2000-08-29 Power Curbers, Inc. Paving apparatus with automatic mold positioning control system
US6692185B2 (en) 2001-10-17 2004-02-17 Power Curbers, Inc. Adjusting arrangement for steerable transport assembly for self-propelled construction vehicle
US6715957B2 (en) 2001-10-17 2004-04-06 Power Curbers, Inc. Paving apparatus with retractable pavement forming assembly
US20160177519A1 (en) * 2014-12-19 2016-06-23 Wirtgen Gmbh Frame Distortion Control
US9631329B2 (en) * 2014-12-19 2017-04-25 Wirtgen Gmbh Frame distortion control
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Also Published As

Publication number Publication date
CA931799A (en) 1973-08-14
BE763673A (fr) 1971-08-02
FR2081631A1 (enExample) 1971-12-10
IL36332A0 (en) 1971-05-26
SU403205A3 (enExample) 1973-10-19
FR2081631B1 (enExample) 1974-08-02
GB1285438A (en) 1972-08-16
NL7102708A (enExample) 1971-09-06
DE2109691A1 (de) 1971-09-16
AU2603771A (en) 1972-09-07

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