WO2001025559A2 - Dispositif d'insertion de barres de guidage pourvu d'un dispositif d'alimentation a chaines - Google Patents

Dispositif d'insertion de barres de guidage pourvu d'un dispositif d'alimentation a chaines Download PDF

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Publication number
WO2001025559A2
WO2001025559A2 PCT/US2000/026609 US0026609W WO0125559A2 WO 2001025559 A2 WO2001025559 A2 WO 2001025559A2 US 0026609 W US0026609 W US 0026609W WO 0125559 A2 WO0125559 A2 WO 0125559A2
Authority
WO
WIPO (PCT)
Prior art keywords
dowel bar
inserter
dowel
pan
bar inserter
Prior art date
Application number
PCT/US2000/026609
Other languages
English (en)
Other versions
WO2001025559A3 (fr
Inventor
Ronald M. Guntert, Jr.
Gerald Lee Dahlinger
Richard W. Francis
Original Assignee
Guntert & Zimmerman Const. Div., Inc.
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
Priority claimed from US09/411,744 external-priority patent/US6390726B1/en
Application filed by Guntert & Zimmerman Const. Div., Inc. filed Critical Guntert & Zimmerman Const. Div., Inc.
Priority to AU78360/00A priority Critical patent/AU7836000A/en
Publication of WO2001025559A2 publication Critical patent/WO2001025559A2/fr
Publication of WO2001025559A3 publication Critical patent/WO2001025559A3/fr

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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
    • 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

  • Concrete slipform pavers are known. Specifically, such pavers include a “tractor” and a “paving kit”.
  • most concrete slipform pavers include a tractor, which is comprised of a rectilinear frame.
  • This rectilinear frame has bolsters extending parallel to the direction of machine travel and cross beams extending across the paved roadway or runway.
  • the rectilinear frame thus straddles the paved concrete path while it is paved.
  • This frame is propelled and supported on either end by side crawler track(s).
  • the frame supports a diesel engine driven hydraulic power unit, which supplies power to the tractor and paving kit.
  • the paving kit is typically suspended below the rectilinear tractor frame by mechanical means.
  • the paving kit takes its hydraulic power from the power unit on the tractor.
  • the tractor and paving kit comprise the slipform.
  • This slipform passes over concrete placed in its path.
  • the concrete is placed in a relatively even and level mass that can be either flat, super elevated (as at curves in the roadway) or crowned.
  • the tractor attached paving kit spreads the concrete dumped in the path of the paver, levels and vibrates it into a semi-liquid state, then confines and finishes the concrete into a slab with an upwardly exposed and finished surface.
  • Sideforms mounted to the side of the slipform kit confine the sides of the slab during the paving process.
  • the tractor typically has either two or four crawler tracks supporting and propelling the frame and attached paving kit.
  • Other kits can be attached to these tractors such as kits for conveying and spreading concrete and trimming and spreading base materials.
  • dowel bar inserter kit used for slipforming a concrete slab and concurrently inserting dowel bars in the plastic concrete across the slipform paved slab.
  • Dowel bars, tie bars and inserters for dowel bars and tie bars on such paving machines are known.
  • dowel bars are placed parallel to the direction of machine travel and ties bars are placed across the direction of machine travel.
  • tie bar inserter for placing tie bars completely within the placed slab.
  • a placed slab might be a two or more 12' (3.657 mm) wide lane being placed concurrently in one pass. These tie bars are placed in a line transverse to the direction of machine travel. These tie bars enable a joint to be subsequently cut in the middle of the slab parallel to the direction of machine travel. Expansion of the slab across the dimension of machine travel is not permitted, the two slabs are tied. This type of tie bar and dowel bar inserter is not of concern here.
  • dowel bar inserter for placing dowel bars parallel to the direction of machine travel.
  • the dowel bars are simultaneously placed in a line (or row) on what are typically 12" (305 mm) centers, across the entire slab being slipformed by the paver. These dowel bars enable a joint to be subsequently cut in the slab across the direction of machine travel.
  • the dowels provide load transfer between the adjoining panels in the direction of machine travel.
  • the smooth dowels also allow the adjoining panels to move while the slab surfaces are kept on the same plane.
  • This type of dowel bar inserter presents the most difficult insertion problem in any slipform paver. Additionally, this type of dowel bar inserter requires modification to be made to the slipform paver to attach the dowel bar inserter. In addition to this, great effort is required to attach or remove the dowel bar inserter from the slipform paver. It might take an additional two days to assemble a machine with a dowel bar inserter. This great effort has limited the dowel bar inserters acceptance on smaller paving jobs. In what follows, we first discuss the most modern pavers, which have been developed. Second, we turn to the prior art problem of dowel bar insertion. Third, we set forth the mechanical problem of attachment and removal of dowel bar inserters to known pavers, including the pavers summarized above.
  • a portable slip form paver that used telescoping members in the direction of machine travel.
  • a four- track paver is disclosed having a frame, which telescopes for transport to reduce the dimension of the machine in the direction of paving machine travel.
  • a rectilinear tractor frame is provided.
  • the frame includes four crawler tracks, one connected to each corner of the frame via a side bolster.
  • the crawler tracks are directly supported on a hydraulic cylinder and mounted for pivotal movement about the vertical axis of the hydraulic cylinder.
  • the frame telescopes at side bolsters between the leading and trailing crawler tracks at the sides of the machine.
  • the paving machine When expanded, the paving machine has the full dimension required for paving. When contracted, the paving machine has a profile allowing convenient transport. Most importantly, such expansion and contraction of the machine in the direction of paving travel does not require substantial paver or paver kit disassembly. As a consequence, a convenient method of loading and off loading to a hauling flatbed trailer exists. With the frame contracted at the side bolsters and the tracks pivoted parallel to the pavement spanning dimension of the frame, both frame and paving kit are elevated and a transporting flatbed trailer moved under the paver. Supports are installed to relieve the slipform paving kit from the full weight of the tractor frame, and the tracks lifted.
  • a conventional telescoping frame on a paving tractor is provided with fixed frame cross beam extension members for insertion to and attachment with a telescoping frame member.
  • the conventional telescoping frame includes paired forward and paired rear side-by-side female tube members. Each forward and rear tube member conventionally acts for the telescoping support of male extension members which attach directly to the side bolster, which in turn attaches to the hydraulic jacking columns and crawlers.
  • the male extension members co-acting with clamps acting through the female tube members provide for both movement of the point of crawler support and expansion of the paving width of the tractor frame.
  • extenders are added for attachment to the supported end of the male extension members interior of the female telescoping members.
  • the male telescoping members are expanded to register their ends interior of the female telescoping members to attachment access ports in the female telescoping member.
  • the extenders are inserted, supported, and registered at complimentary attachment apertures with attachment to the male telescoping members taking place. Once attachment has occurred, further extension of the male telescoping members occurs.
  • a simple system of pinned cross bracing reinforces the extended frame with relatively light bracing members.
  • dowel bar inserters from time to time.
  • the dowel bars must be placed parallel to the direction of machine travel.
  • a line of dowel bars must be simultaneously inserted across the slab being formed.
  • 12 to 34 or more such dowel bars can be inserted depending upon the width of pavement being paved.
  • Center to center spacing of insertion between the dowel bars can vary. Variation can occur from about 12 inches (305 mm) on typical highway paving up to 18 inches (457 mm) for certain airport runways, aprons and taxiways. All such dowel bars must be inserted simultaneously by a mechanism, which remains stationary with respect to the plastic concrete slab being continuously formed.
  • the dowel bar inserter must be on rails, which permit dowel bar inserter travel in the direction of concrete placement by the machine.
  • Placement of dowel bar inserters on existing pavers has also caused difficulty. To place such inserters on a conventional paver, substantial machine disassembly and modification must occur. First, the trailing finishing pan must be removed. Second, the conventional bolsters must be modified and extensions added to allow room in front of the rear crawler track to make room for the dowel bar inserter to work. These bolster extensions also support the dowel bar inserter kit. Third, because the rear crawler tracks have been moved back, a cross-beam must be added between the rear bolsters to prevent the extended bolsters from twisting under load. Fourth, an optional spreader plow for the correcting beam must be added.
  • an oscillating correcting beam - the beam that establishes the final slab grade from the paver, after the dowel bar inserter inserts the bars - must be added. Thereafter, the trailing finishing pan is reattached behind the correcting beam.
  • the dowel bar inserter and its related attachments also necessitates two additional trucks to haul it.
  • dowel bar inserters are not used because of the high mobilization cost. Instead, such dowel bars are tied together and support on "baskets” or “chairs” and secured to the subgrade ahead of the slipform.
  • the baskets hold the dowels in position at the center of the slab.
  • an additional machine(s) concrete placer spreader(s)
  • dowel baskets assemblies are significantly more expensive than loose dowels and require additional machinery to deliver the concrete across the front of the slipform and significant labor to install.
  • automatic dowel bar inserters have their slab confining pans configured with closely spaced apertures formed between two lane spacer pans, through which dowel bars are inserted.
  • the dowel bars are first distributed across the confining pan. Just prior to insertion the dowel bars are dropped on the recently slipformed slab at the apertures. At this point the dowels are vibrated into the slab by vibrating inserters in combination with light hydraulic pressure - with two sets of such inserter forks pushing each dowel bar into place with respect to the pan.
  • the inserter forks are at an angle during dowel bar insertion or not properly centered on the apertures, it is possible for the inserter forks to come into contact and interfere with the sides of the dowel bar lane spacer pans (dowel bar insertion apertures).
  • each dowel bar be placed at a uniform depth with respect to the top surface of the slab. If the dowel bars are placed at varying depths in the slab, this placement can fall outside of the job specifications. Uniform dowel depth is important for the reasons that uniform load transfer between discrete slabs across expansion joints may not occur.
  • dowel bar insertion Another problem with dowel bar insertion is displacement of the plastic slab from the shape of the slipformed as it leaves the paver. Assuming that dowel bars are vibrated and inserted into a slab, the fluidized the concrete around the placed dowel bar. And when the concrete is fluidized and the mass of an additional dowel bar added to the slab, concrete becomes displaced. The displaced concrete mass must subsequently be "refmished” to form an acceptable pavement surface.
  • dowel bar apertures defined between the dowel bar lane spacer pans
  • the dowel bar inserter pan typically floats on the newly placed concrete. When a dowel bar is inserted through dowel bar apertures in a dowel bar inserter pan, slab displacement due to dowel bar insertion is confined and minimized.
  • dowel bar inserters in combination with a dowel bar insertion pan having dowel bar insertion apertures presents another difficulty. It is necessary to keep the inserter support beam, on which the inserter fork assemblies are mounted centered in respect to the dowel bar inserter pan apertures. Such centering must occur without adversely affecting the pressure or load on the dowel bar inserter pan that floats on the plastic concrete.
  • This dowel bar inserter kit enables dowel bars to be placed to a "crowned" slab through a dowel bar inserter pan which in effects "floats" on the surface of the concrete. Inserting occurs through apertures in the dowel bar insertion pan while the pan confines at least some of the resultant expansion of the concrete due to the insertion of the dowel bars. Most importantly, the insertion of the dowel bars does not appreciably change the buoyant forces on the dowel bar inserter pan. As will be seen, this seemingly simple problem has a complex solution.
  • a paver is provided with a removable dowel bar inserter kit adapted for the placement of dowel bars in a slab provided with or without a crown.
  • the paver has a propelling apparatus for moving along a paving path.
  • a frame is supported from the propelling apparatus and includes paver bolsters extending parallel to the paving path and cross beams extending across the paving path.
  • the suspended slipform paving kit is attached to the paver frame for receiving concrete placed on the paving path and slipforming the plastic concrete into a continuous slab on the paving path.
  • the paving kit as suspended from the paver gives the slab its shape. This shape can be flat or crowned. When, the slab is paved with a crown, the problem solved by this invention arises.
  • a dowel bar inserter kit attaches to the paver frame at four flanges.
  • This dowel bar inserter kit has a dowel bar inserter pan defining dowel bar inserter apertures.
  • this dowel bar inserter kit includes dowel bar inserter assemblies. These inserters have forks which extend through the dowel bar insertion apertures in the dowel bar insertion pan.
  • dowel bars are placed on the recently formed plastic slab through the dowel bar insertion apertures.
  • the dowel bar inserters push the placed dowel bars and vibrate the placed dowel bars. As pushed and vibrated, the dowel bars are imbedded into the slab. This disclosure is directed to enabling this process to occur when a slab is crowned.
  • two lateral supportbeams extending away from the paver frame in the direction of machine travel.
  • the two carriages are on opposite sides of the dowel bar inserter kit, and ride on the lateral support beams, with one carriage on each beam.
  • the movement of the carriages on the lateral support beams occurs synchronously on both sides of the paving kit.
  • the carriages travel on the beams but remain stationary with respect to the recently placed plastic slab during dowel bar insertion.
  • the two carriages simultaneously retract to the paver frame on the lateral supporting beams at the conclusion of each dowel bar insertion cycle.
  • the carriages together provide four discrete functions.
  • Fourth, the carriages enable side to side, and fore and aft centering of the dowel bar inserter pan at their edges adjacent the carriages.
  • the suspended dowel bar inserter pan is required to crown corresponding to any crown placed in the continuous slab by the paving kit of the paver.
  • the dowel bar inserter pan is supported from the carriages on either side of the paver, hydraulic crowning cylinders are provided in the center of the dowel bar inserter pan. These cylinders expand to crown the dowel bar inserter pan responsive to a sensor taking reference from the corresponding crown on the paving kit of the paver.
  • the dowel bar inserter pan can be crowned to match the slab crown without requiring support from the central portion of the paver.
  • the insertion beam for the dowel bar inserters be centered with respect to the dowel bar insertion pan.
  • the insertion beam When the insertion beam is horizontal and centered, the insertion forks for the dowel bars avoid interference with the narrow openings in the dowel bar inserter pan through which the dowel bars are introduced to the slab.
  • the insertion beam must "crown" in conformance with the corresponding "crown" on the dowel bar inserter pan at the end of the dowel bar insertion cycle.
  • central vertical telescoping tubes extend between the insertion beam at an upper end and a pin to the dowel bar inserter pan at a lower end to maintain centering and to permit insertion of all dowel bars to their specified depth. These central telescoping tubes must be maintained vertical.
  • the central telescoping tube attached to the insertion beam is provided with a dynamic "A-frame” linkage to maintain verticality with respect to the frame of the paver.
  • This central telescoping tube attached to the insertion beam imparts centering to the complimentary central telescoping beam attached to the central "crowning" portion of the dowel bar inserter pan.
  • two links attach to the insertion beam equidistant from a central insertion beam hinge.
  • the central insertion beam hinge permits insertion beam crowning; these links form the sides of the dynamic "A-frame.”
  • the links are pinned at top of the dynamic "A-frame" to the top of the telescoping tube from the insertion beam to provide a first vertical reference point to the telescoping beam.
  • a second vertical reference point is supplied to the central telescoping beam attached to the insertion beam by rollers attached to the insertion beam.
  • a vertical telescoping tube extending from the insertion beam is provided with a vertical reference with respect to the paver.
  • a complimentary central telescoping tube is pinned centrally of the dowel bar inserter pan at its lower end.
  • This complimentary central telescoping tube is received through a roller arrangement in sliding engagement with the upper central telescoping tube from the insertion beam. Consequently, as the insertion beam moves towards and away from the dowel bar inserter pan, the insertion beam is centered with respect to the dowel bar inserter pan. Likewise, and because of the roller arrangement, such movement occurs without appreciably changing the loading on the dowel bar inserter pan.
  • the insertion beam and suspended the dowel bar inserter assemblies are disposed in a horizontal disposition overlying the crowned dowel bar inserter pan. This enables the dowel bar inserter assemblies to precisely penetrate the apertures for insertion of dowel bars through the dowel bar inserter pan openings, as the dowel bar inserter both floats and is supported at its ends with respect to the recently formed and plastic concrete slab.
  • the pan is crowned and insertion beam is disposed horizontally during the initial dowel bar insertion process, the first inserter fork on either side of the crown will reach their final insertion depth first. This will not be true for the inserters at either extreme end of the dowel bar inserter beam. These inserters will only partially penetrate to their full depth.
  • the dowel bar inserter beam When the dowel bar inserter beam effectively reaches full penetration of the inserters that are central to the dowel bar inserter pan, the dowel bar inserter beam is crowned by hydraulic cylinders to match the crown of the dowel bar inserter pan. This causes the inserters at each extreme end of the insertion beam to register to the dowel bar inserter apertures on the dowel bar inserter pan. At the same time, the insertion beam remains centered with respect to the dowel bar inserter pan. Full penetration of the dowel bars across the "crowned slab" is assured.
  • the sequence is reversed.
  • the dowel bar inserter beam is first moved to the horizontal disposition. It is thereafter retracted so that the individual inserter forks clear the dowel bar insertion apertures in the dowel bar insertion pan. Thereafter, the dowel bar inserter pan is retracted to the paver in the direction of paver movement with the supporting carriages moving on the lateral support beam. Repeating of the cycle occurs until paving is completed.
  • FIG. 1A is a perspective view of a slipform paver in accordance with Guntert et al US Patent 5,590,977 and 5,615,972 showing the slipform paver in exploded relationship with respect to the dowel bar inserter kit of this invention;
  • Fig. IB is a partial perspective view of the dowel bar inserter kit showing the side bolsters, side lateral supporting beams, the supporting carriages, a structural cross-beam, the dowel bar inserter beam, dowel bar inserter fork assemblies , dowel bar inserter pan, an oscillating correcting beam, trailing sideforms and supports and the trailing finishing pan;
  • Fig. 1C is a partial perspective of the dowel bar inserter illustrating the chain feeder with vertical loading magazine where dowel bars are deposited being readied for registration for insertion into the plastic concrete slab;
  • Fig. 2 is a cross-section taken along lines 2 - 2 of Fig. 1A illustrating the attached dowel bar inserter kit and paver, the rear support beam of the inserter kit attaches to the rear of the rear jacking columns of the slipform tractor frame;
  • Figs. 3A, 3B, and 3C are respective plan, side elevation, and end elevation views of the carriage on the left rear side of the machine as it proceeds in the forward direction;
  • Figs. 4A, 4B and 4C are respective plan, side elevation, and end elevation views of the central vertical telescoping tubes between the lower central portion of the dowel bar inserter pan and the insertion beam;
  • Fig. 5 A - Fig. 5D are a cartoon series of dowel bar insertion where Fig. 5 A illustrates the fully retracted dowel bar inserters suspended from a horizontal dowel bar inserter beam with dowel bars placed on the slab through dowel bar insertion apertures in the dowel bar insertion pan;
  • Fig. 5B illustrates the beginning penetration of the dowel bar inserters through the dowel bar insertion apertures of the dowel bar insertion pan with the central dowel bar inserters making dowel bar insertion aperture penetration and the side dowel bar inserters out of registration with their respective dowel bar insertion apertures;
  • Fig. 5C illustrates the central dowel bar inserters fully penetrated through the dowel bar insertion apertures of the dowel bar insertion pan but the side dowel bar inserters not fully penetrating their respective dowel bar insertion apertures because the dowel bar insertion beam is yet to crown;
  • Fig. 5D illustrates the fully crowned dowel bar insertion beam enabling full and uniform penetration of the dowel bar inserters at all apertures across the dowel bar insertion pan, this figure showing schematically the elevation and steering reference wire on one side of the machine;
  • Fig. 6 is schematic of a sensor system for crowning of the dowel bar inserter pan with respect to the main slip form under the paver.
  • paver P and dowel bar inserter kit E are shown in exploded relationship. As the full description of the paver is set forth in the referenced patents, only a summary description of paver P will here be provided.
  • Paver P includes paver bolsters 14, paver cross beams 16, front jacking columns 18 and rear jacking columns 20. Together, paver bolsters 14, paver cross beams 16, front jacking columns 18, and rear jacking columns 20 constitute paver frame F. Paver P suspends slip form paving kit 22 from paver frame F. Finally, paver P must be propelled. Such propulsion comes from four crawler tracks T. The reader will understand that many pavers P only have two crawler tracks. Further, it will be understood that the example of crawler tracks T is exemplary only. All kinds of devices are utilized to propel pavers including tires, rails, cables, sleds and the like. The propulsion referred to in this specification is considered to be generic.
  • Dowel bar inserter kit E is the novel subject matter of this invention.
  • Dowel bar inserter kit E includes side bolsters or support beams S and at least one crossbeam C. These members form a rigid construction enabling the dowel bar inserter kit E to be handled in a unitary manner.
  • the reader will observe that crossbeam C has been broken away in the view of Fig. 1 to enable important working portions of dowel bar inserter kit E to be seen.
  • crossbeam C is unitary, solid member which performs structural reinforcement function when dowel bar inserter kit E is attached to paver P and ties the dowel bar inserter kit E together when it is separated from paver P.
  • Front jacking columns 18 and rear jacking columns 20 level paver frame F with respect to a level reference system which is here not shown or discussed. What is important to understand is that paver frame F is maintained level in a disposition for paving and that dowel bar inserter kit E must have that same level disposition in order to function properly. Accordingly, attachment of side bolsters or support beams S to paver frame F and rear cross beam C to jacking columns 20 will now be set forth. Paver P requires the addition of four mounting flanges to enable side bolsters or support beams S to be attached to paver frame F. Rear jacking column flanges 24 and rear paver cross beam flanges 26 are provided to paver P.
  • each side bolster B is rigidly affixed to paver frame F of paver P and maintains the same disposition of paver P when the required attachment occurs. It will be realized that in Fig. 1 A we do not actually show the required physical attachment; the exploded view is provided for the convenience of the reader so that the kit may readily be distinguished from the paver. It will be understood that during attachment of dowel bar inserter kit E to paver P, hydraulic and electric power is most conveniently provided from paver P to dowel bar inserter kit E. It will therefore be understood that medially of paver P and medially of dowel bar inserter kit E there are respective electrical and hydraulic connections to provide the required power. These conventional connections are not shown and will not hereafter be discussed.
  • Dowel bar inserter kit E at crossbeam C and side bolsters or support beams S travels with paver P.
  • Typical paving speeds can be as high as 15 feet (4.57 M) per minute.
  • a line of dowel bars is required about every 15 feet.
  • dowel bar inserter forks 32 such inserters are here shown mounted in arrays 34 of four sets of four inserter forks. Each array 34 attaches to inserter beam I at and through a vibration isolator (not shown). Further, each array 34 of four inserter forks each includes three electrically powered vibrators (also not shown). Naturally, the parameters of the dowel bar inserter array 34 can vary. Arrays having two or three forks and greater or lesser number of vibrators will work as well. Presuming that inserter beam I is stationary with respect to the recently formed plastic concrete slab L, insertion of the dowel bars can be conventionally described.
  • Fig. IB illustrates, dowel bar inserter pan D provided with continuous front member 36, raised rear member 38, and lane spacer members 40 there between. In between lane spacer members 40, there is provided dowel bar insertion apertures 33.
  • dowel bar inserter forks 32 For the brief purpose of explaining the geometry of the dowel bar inserter forks 32, the reader is asked to consider the case where dowel bars are lying on the freshly formed concrete slab L immediately under dowel bar inserter forks 32 array 34. All that is required is that inserter beam I be lowered and array 34 of dowel bar inserter forks 32 be vibrated. When this occurs, dowel bars are inserted to the mid point of freshly formed slab L. The exact matter of placement of dowel bars to the slab L will later be made clear with respect to Figs. 5 A - 5D.
  • dowel bar insertion has an effect on the freshly slip formed slab L (See Figs. 5 A - 5D).
  • both the added mass and confinement of the dowel bar inserter pan D and the vibration of dowel bar inserter forks 32 causes the surface of slab L to raise (or to be displaced) above that of the finished slab L.
  • This displacement is apparent as the slab with the freshly inserted dowel bars comes from slipform 22 on paver P.
  • raised rear member 38 of dowel bar inserter pan D enables this raised (or displaced) portion of the concrete to freely pass out through the back of the dowel bar inserter pan D.
  • dowel bar inserter kit E includes oscillating correcting beam O.
  • dowel bar inserter kit E is supplied with its own side forms. These side forms confine the plastic concrete slab at the edges during dowel bar insertion. For convenience of transport, the side forms remain connected to the dowel bar inserter kit E. Second, however, it will be remembered that paver P and its attached dowel bar inserter kit E is continuously moving at a rate up to about 15 feet (4.57 M) per minute placing slipformed slab L. Thus there is a need that during insertion that array 34 of dowel bar inserter forks 32 remain stationary with respect to the slipformed slab L as the dowel bar are inserted.
  • Rails R on side bolsters or support beams S and cars K supporting inserter beam I at either end provide this function.
  • Side bolsters or support beams S are provided with rails R on lateral support beams.
  • Cars or carriages K ride on rails R towards and away from paver P.
  • cars K may be held stationary with respect to recently slipformed slab L even though paver P proceeds continuously in the forward direction at a relative speed of up to 15 feet (4.57 M) per minute.
  • the "down cycle" of array 34 of dowel bar inserter forks 32 is in the order of 7 seconds. Further, dwell time at the full depth of insertion is about 3 seconds.
  • carriage K on rails R on support beam S is shown.
  • Upper roller array 52 captures rail R on top of support beam S.
  • Lower roller array 54 captures rail R below support beam S. It will be understood that carriage K is free to ride rails R on support beam S towards and way from the direction of the paver kit travel.
  • carriages K move simultaneously and have four discrete functions. The particular functions will each be described and those portions of the carriages K which perform those functions will be set forth. Some reference will have to be made with respect to Figs. 5 A - 5D to set forth these functions.
  • carriage K support dowel bar inserter pan D through winches 50 and telescoping dowel bar inserter pan tubes 56.
  • dowel bar inserter pan D in effect "floats" on the surface of slab L, it will be understood that winches 50 can be provided with separate and individual adjustment to obtain optimum response relative to bouyant forces reacting from slab L.
  • carriages K on rails R of support beam S support inserter beam I.
  • Such support is provided by inserter beam cylinders 60 fastening at height adjustment 62 on top of carriage K at one end and inserter beam I at clevis 64 at the lower end.
  • roller group 70 rides on square vertical rider tube 72.
  • inserter beam I is pendulously supported from the respective carriages K. It will be remembered that inserter beam I "crowns", creating a change in the length of this beam between roller groups 70 at the respective ends of the beam. In actual fact, roller groups 70 pin to the carriages at inserter beam pivots 74.
  • carriages K provide alignment to dowel bar inserter pan D. It will be seen that telescoping dowel bar inserter pan tubes 56 (also provided with roller groups) effect such centering of the dowel bar inserter pan D adjacent carriages K.
  • dowel bar inserter pan D has medial dowel bar inserter pan hinge 80. Overlying medial dowel bar inserter pan hinge 80 are dowel bar pan cylinders 82. When dowel bar pan cylinders 82 expand, dowel bar inserter pan D crowns about medial dowel bar inserter pan hinge 80.
  • dowel bar inserter pan D is essentially supported at each end at carriages K. Such support comes from winches 50, and the buoyant force produce by dowel bar inserter pan D as it passes over slab L. Where the previously laid slab L is provided with a crown, and dowel bar pan cylinders 82 are expanded, dowel bar inserter pan D will match the crown already imparted to slab L.
  • pan 85 under paver P can provide a convenient reference.
  • a roto-valve sensor 87 takes reference from the height of pan 85.
  • This sensor provides hydraulic fluid to dowel bar pan cylinders 82. These cylinders in turn cause dowel bar inserter pan D to crown. It will be understood that this crowning is assisted by the buoyant force acting on dowel bar inserter pan D.
  • the force by which dowel bar inserter pan D bears on the crown of slab L is adjustable.
  • Inserter beam I is centered with respect to dowel bar inserter pan D centrally of both dowel bar inserter pan D and inserter beam I. This centering must occur without force being appreciably varied on dowel bar inserter pan D.
  • Inserter beam I is provided with dynamic A-frame Q.
  • the action of this dynamic A-frame Q can be best seen in Fig. 4C.
  • Central inserter beam vertical tube 92 mates with central dowel bar inserter pan vertical tube 96, which is pinned at medial dowel bar inserter pan hinge 80. At the same time, central inserter beam vertical tube 92 passes through roller assembly 97. Given the relationship of dynamic A-frame Q and roller assembly 97, it will be seen that central inserter beam vertical tube 92 effectively bisects the angle between each half of inserter beam I. As a result, central inserter beam vertical tube 92 will remain essentially vertical.
  • Mating central dowel bar inserter pan vertical tube 96 is pined at dowel bar inserter pan D at medial dowel bar inserter pan hinge 80.
  • This central dowel bar inserter pan vertical tube 96 fits into and is received in mating relation by central inserter beam vertical tube 92.
  • the respective central inserter beam vertical tube 92 and central dowel bar inserter pan vertical tube 96 move in sliding vertical relationship one to another.
  • roller assemblies 97 are utilized. As a result, centering between inserter beam I and dowel bar inserter pan D. This assures that dowel bar inserters 32 pass through dowel bar insertion apertures 42 in dowel bar inserter pan D.
  • inserter beam I is horizontally disposed.
  • inserter beam I has its respective dowel bar inserter kit T with their respective dowel bar inserter assembly arrays 34 with inserter forks 32 aligned parallel to dowel bar insertion apertures 42 in dowel bar inserter pan D.
  • dowel bar inserters 32 pass through dowel bar insertion apertures 42 without interference.
  • inserter beam I is shown lowered to dowel bar inserter pan D at central hinge 80. It will be understood that the central portion of inserter beam I can not be lowered further without interference from dowel bar inserter pan D in the vicinity of central hinge 80.
  • inserter beam I is hinged about central support beam hinge 100. This hinging action is brought about by expansion of crown cylinders 142. This causes each of the respective ends of inserter beam I on either side of central support beam hinge 126 to be disposed parallel to the respective corresponding sides of dowel bar inserter pan D relative to slip form hinge 122. All dowel bar inserters 32 from dowel bar inserter kits I will dispose respective dowel bars urged by the inserters into the freshly formed slab L to the same depth relative to the top surface of slab L.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
  • Road Paving Machines (AREA)

Abstract

L'invention concerne un ensemble d'insertion de barres de guidage utilisé en association avec une épandeuse. Cet ensemble d'insertion est fixé de manière amovible à l'épandeuse et comprend au moins deux poutres de support s'étendant de manière latérale, supportées par l'épandeuse et placées à distance et derrière cette dernière pour former la dalle de béton plastique. Plusieurs chariots de support se déplacent de manière synchronisée sur chaque poutre de support pour s'éloigner ou se rapprocher du châssis de l'épandeuse. Un dispositif suspendu d'insertion de barres de guidage est fixé au niveau des extrémités distales aux chariots de support, et définit des ouvertures permettant d'insérer les barres de guidage à travers ce dispositif d'insertion. Ce dispositif possède une articulation médiane qui lui permet de se positionner au-dessus de la dalle de béton plastique qui vient d'être placée. Une poutre d'insertion est fixée au niveau des extrémités distales aux chariots de support. Cette poutre comporte des dispositifs d'insertion de barre de guidage correspondant aux ouvertures prévues pour l'insertion de ces barre à travers le dispositif d'insertion. Cette poutre est équipée d'une articulation de poutre d'insertion médiane qui lui permet de se positionner au-dessus par rapport au couronnement correspondant du dispositif d'insertion suspendu de barres de guidage.
PCT/US2000/026609 1999-10-01 2000-09-28 Dispositif d'insertion de barres de guidage pourvu d'un dispositif d'alimentation a chaines WO2001025559A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU78360/00A AU7836000A (en) 1999-10-01 2000-09-28 Dowel bar inserter kit having chain feeder

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US09/411,744 1999-10-01
US09/411,744 US6390726B1 (en) 1999-10-01 1999-10-01 Dowel bar inserter kit having chain feeder
US09/586,468 US6390727B1 (en) 1999-10-01 2000-06-01 Dowel bar inserter kit having chain feeder
US09/586,468 2000-06-01

Publications (2)

Publication Number Publication Date
WO2001025559A2 true WO2001025559A2 (fr) 2001-04-12
WO2001025559A3 WO2001025559A3 (fr) 2001-10-04

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PCT/US2000/026609 WO2001025559A2 (fr) 1999-10-01 2000-09-28 Dispositif d'insertion de barres de guidage pourvu d'un dispositif d'alimentation a chaines

Country Status (2)

Country Link
AU (1) AU7836000A (fr)
WO (1) WO2001025559A2 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4493584A (en) * 1981-12-17 1985-01-15 Guntert & Zimmerman Const. Div., Inc. Apparatus and process for dowel insertions
US5135333A (en) * 1991-01-09 1992-08-04 Guntert & Zimmerman Const. Div. Inc. Band reinforcement inserting apparatus and process
US5190397A (en) * 1991-03-18 1993-03-02 Gomaco Corporation Dowel bar insertion method and apparatus for concrete paving machine
US5209602A (en) * 1991-06-10 1993-05-11 Gomaco Corporation Method and apparatus for inserting dowel bars for a concrete slip forming machine
US5405212A (en) * 1992-06-18 1995-04-11 Cmi Corporation Paving machine with drop-then-stop dowel bar insertion
US5615972A (en) * 1995-07-20 1997-04-01 Guntert & Zimmerman Construction Div., Inc. Paving machine with extended telescoping members
US5647688A (en) * 1995-07-20 1997-07-15 Guntert & Zimmerman Const. Div., Inc. Paving machine with extended telescoping members
US5924817A (en) * 1996-08-13 1999-07-20 Gomaco Corporation Apparatus on a concrete slip forming machine for inserting dowel bars within a split pan having critical dimensions

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4493584A (en) * 1981-12-17 1985-01-15 Guntert & Zimmerman Const. Div., Inc. Apparatus and process for dowel insertions
US5135333A (en) * 1991-01-09 1992-08-04 Guntert & Zimmerman Const. Div. Inc. Band reinforcement inserting apparatus and process
US5190397A (en) * 1991-03-18 1993-03-02 Gomaco Corporation Dowel bar insertion method and apparatus for concrete paving machine
US5209602A (en) * 1991-06-10 1993-05-11 Gomaco Corporation Method and apparatus for inserting dowel bars for a concrete slip forming machine
US5405212A (en) * 1992-06-18 1995-04-11 Cmi Corporation Paving machine with drop-then-stop dowel bar insertion
US5615972A (en) * 1995-07-20 1997-04-01 Guntert & Zimmerman Construction Div., Inc. Paving machine with extended telescoping members
US5647688A (en) * 1995-07-20 1997-07-15 Guntert & Zimmerman Const. Div., Inc. Paving machine with extended telescoping members
US5924817A (en) * 1996-08-13 1999-07-20 Gomaco Corporation Apparatus on a concrete slip forming machine for inserting dowel bars within a split pan having critical dimensions

Also Published As

Publication number Publication date
AU7836000A (en) 2001-05-10
WO2001025559A3 (fr) 2001-10-04

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