EP0117323B1 - Vorrichtung und Verfahren zum Einbringen von Dübeln in die Fugen von Betondecken - Google Patents

Vorrichtung und Verfahren zum Einbringen von Dübeln in die Fugen von Betondecken Download PDF

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Publication number
EP0117323B1
EP0117323B1 EP19830300675 EP83300675A EP0117323B1 EP 0117323 B1 EP0117323 B1 EP 0117323B1 EP 19830300675 EP19830300675 EP 19830300675 EP 83300675 A EP83300675 A EP 83300675A EP 0117323 B1 EP0117323 B1 EP 0117323B1
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EP
European Patent Office
Prior art keywords
dowel
arms
concrete
dowels
panel
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Expired
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EP19830300675
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English (en)
French (fr)
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EP0117323A1 (de
Inventor
Ronald M. Guntert
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Guntert and Zimmerman Construction Div Inc
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Guntert and Zimmerman Construction Div Inc
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Priority to EP19830300675 priority Critical patent/EP0117323B1/de
Priority to DE8383300675T priority patent/DE3373200D1/de
Publication of EP0117323A1 publication Critical patent/EP0117323A1/de
Application granted granted Critical
Publication of EP0117323B1 publication Critical patent/EP0117323B1/de
Expired legal-status Critical Current

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    • 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

  • This invention involves a method and apparatus for placing steel dowels between concrete panels within the expansion joint between concrete panels relatively immediately after panels are poured. By placing the dowels after the panels are poured, the dowels can be accurately located within the panels. There is provided a dependable, continuous, rapid, accurate, and economic method to distribute and place steel dowels in the transverse expansion between concrete panels without production delays.
  • expansion joints In concrete panels used for roadways and runways, placement of expansion joints is required. These expansion joints permit the concrete panels to shrink upon cure without the panels randomly cracking. Additionally and during the life of such roadway or runway panels, working occurs due to thermal expansion and contraction and normal flexure due to the passage of travelling loads, such as trucks and planes.
  • slabs are provided with expansion joints. These joints are formed to a depth that is in the order of one-third the thickness of the panel. The remaining portions of the panel crack in sympathy with the formed expansion joint along irregular boundaries that can be best described as mortise joints.
  • the dowels must be precisely placed.
  • the dowels must have sufficient depth so that the concrete does not work or splay in the vicinity of the dowel placement. Moreover, they must be precisely horizontally aligned. This permits the panels to work towards and away from each other along the dowels but at the same time prevents the panels from changing their elevation relative to one another during such towards and away movement.
  • Imprecise dowel placement can be disastrous.
  • dowels are aligned in a fashion that is other than horizontal and generally other than normal to the plane of the expansion joint, and more particularly where the dowels are skewed randomly out of a normal to the plane of the expansion joint, the expansion-contraction of the adjacent concrete panels eventually causes panel destruction.
  • side-by-side dowels skewed at random angles destroy the concrete panels from the edges commencing with the panel portion adjacent the dowel. Systematic panel destruction from the edges results.
  • Finishing beams in passing over poured and cured concrete depress large concrete particles (such as aggregate and the like) in their paths of travel and accumulate the concrete fines (a mixture of sand, small gravels and cement known as grout) in their path of travel. This accumulated grout typically precedes a finishing beam and readily fills the indentations caused by the placement of dowels.
  • the dowels are literally forced into the concrete by mechanical means directly coupled to the arms. Upon such forcing into the ground, reactive forces cause displacement of the platform from which they are placed. Reference to line and grade is lost. Where the platform from which placement occurs is a slip form, disturbance of the entire concrete panel can result.
  • dowel joinder to the cured concrete panel is uncertain.
  • the invention also provides a process for the insertion of a dowel in at least one freshly poured concrete panel, the process comprising suspending first and second dowel arms from a support, gathering a dowel onto the said arms; urging the dowel and arms into said at least one panel while vibrating the dowel and arms with sufficient energy to fluidize the concrete around the dowel; releasing the dowel from the arms; and withdrawing the arms, characterised in that the dowel is gathered on the dowel arms by the generation of a magnetic flux in a circuit which includes the dowel, and the vibration is interrupted momentarily whilst the arms are removed from the inserted dowel and recommenced during retraction of the arms from the at least one panel, and in that the vibration of the dowel and arms is isolated from the said support.
  • each dowel is grasped by an individual inserter.
  • the inserter is mounted from a carrier and includes paired tangs having female dowel receiving ends of arcuate configuration at the lower portion thereof, which female arcuate ends precisely mate to and receive the dowels. These tangs are connected at a depth above maximum concrete penetration by an electromagnet.
  • a vibrator is attached to communicate vibrational energy to the inserter, this vibrator being chosen to have sufficient vibrational energy to fully liquefy the concrete.
  • Dowel insertion includes positioning the paired tangs of each inserter over a steel and magnetic dowel, turning on the magnet and grasping a dowel by a precise fit at the female arcuate surfaces to the dowel.
  • the dowel and inserter are positioned over a joint between two freshly poured concrete panels.
  • the vibrators are turned on and the inserter lowered.
  • the inserter and firmly grasped dowel liquefy the concrete in their downward passage and allow full depth penetration of the dowel in precise horizontal alignment to the referenced line and grade of the dowel insertion apparatus.
  • the vibrator is turned off and the dowel instantly becomes embedded in the freshly poured concrete as the lack of vibration solidifies the concrete relative to the dowel.
  • the vibration is recommenced with the vibrator fluidizing the concrete and filling any resultant voids.
  • a dowel storage bin with distributing conveyor enables a row of inserters mounted to a carrier to distribute a plurality of dowels between two panels simultaneously, the dowels being evenly distributed the width of any expansion joint.
  • a carrier for handling a group of correspondingly distributed inserters enables the disclosed mechanism to be operated off of a moving platform referenced to line and grade, such as a slip form paver, or on an independently mounted and moved frame. By synchronizing carrier movement so that speed relative to the ground is not present, dowel insertion along a joint after pouring can occur without disruption of paver movement.
  • a hydraulically actuated carriage for operating a plurality of inserters.
  • the carriage operates during rod insertion to maintain a stationary position over a joint between two panels.
  • the carriage is operating from a moving frame referenced to line and grade, such as a slip form for the placement of concrete.
  • a moving frame referenced to line and grade, such as a slip form for the placement of concrete.
  • An object of this invention is to disclose an apparatus for the insertion of steel dowels between freshly poured concrete panels at an expansion joint with precise alignment and placement of the dowels.
  • the dowels are located accurately with respect to grade and line by manipulation of the inserter.
  • An advantage of the apparatus is that the prior art practice of placement of the dowels with a "chair” is avoided. A time consuming and expensive placement of "chairs" before panel curing is avoided.
  • Yet another object of this invention is to disclose a process for dowel placement using the disclosed inserter.
  • An advantage of the disclosed process is that immediately prior to lowering of the dowels, their positioning relative to the joint area between two adjacent concrete panels can be visually checked. Precise dowel placement results. Placement of a panel joint over "chair” supported dowels previously placed but hidden by poured concrete is not required.
  • a further advantage of the disclosed process is that the concrete is fluidized during dowel insertion. Consequently, reactive forces on the inserters are minimized. Where the machine is mounted to slip form apparatus, undue displacement of the slip form and corresponding deformation of the panel does not occur. Where the inserter is mounted to an independent frame unit, movement of the frame from supporting tracks or wheels does not occur.
  • Yet another advantage of the disclosed process is that during the insertion of the dowel, the concrete placed is not classified into grout and aggregate components or otherwise appreciably disturbed. Consequently, the dowel joined to the panel is fully capable of accommodating the designed expansion and contraction. Areas of panel weakness do not exist on, in, above or about the dowel.
  • Still another advantage of the disclosed process is that once the dowel is at the desired depth and the vibration stopped, instant solidification of the concrete about the dowel occurs. Consequently, the dowel is immediately embedded into the surrounding concrete. Retraction of the placing tangs from the dowel can occur with a minimum of disturbance.
  • a further advantage of the disclosed process is that the concrete is maintained in a homogeneous panel in and around the inserted dowel.
  • the disclosed vibrating and fluidizing process does not classify or segregate constituents of the concrete. It does not leave void in the concrete. Moreover, the accumulation of grout above the inserted dowel does not occur.
  • a further advantage of the apparatus and process herein disclosed is that dowel insertion occurs into freshly poured concrete panel and not ahead or in the path of concrete paving machinery.
  • the front or the sides of concrete paving machinery become otherwise occupied as large quantities of concrete to service automated pavers must be brought in in these areas. Indeed, some roadways are built in areas of restricted access where only the front portion of the paver is accessible.
  • dowels are not required to be placed in front of the paver. Instead dowels are inserted to the rear of the machine. Production convenience in dowel insertion is achieved.
  • This invention allows for the insertion of dowels in mass across a joint between two concrete panels.
  • a magazine loaded with dowels is discharged to a chain conveyor having a plurality of stations thereacross.
  • the conveyor receives and spaces dowels in anticipation of the dowels being picked up by correspondingly spaced inserters.
  • the inserters grasp the dowel through contact and thereafter activation of the inserter magnets.
  • An advantage of this arrangement is that the disclosed apparatus can be made the width of poured concrete panels. By variation of the spacing on the conveyor and corresponding variation of the spacing between inserters, varying dowel dimensions and spacing can be accommodated.
  • a further advantage of this arrangement is that production of a slip form paver need not be interrupted. Periodic stopping and starting of the paver are not required.
  • a further advantage of this arrangement is that the disclosed apparatus can be mounted relative to or independent of a paver.
  • it can be mounted on its own separate frame which may either be intermittently positioned for dowel placement or continuously moved so long as reference to grade and line is maintained.
  • a side benefit of the use of resilient inserters is that the dowels can be conveyed into precise position for pickup by inserters having the same corresponding precise position. The vibrational energy is not communicated to the conveyor. Consequently, dowels on the inserters are not "walked” or vibrated out of position; they remain precisely positioned so that remote handling is possible.
  • dowel inserter A of this invention is shown in perspective overlying concrete slabs 10 and 11 with dowel 14 extending across an expansion joint area between the panels.
  • the reader will realize that the expansion joint has not been yet placed.
  • the expansion joint is only schematically shown so that placement of the dowel in the panel across the joint is fully understood.
  • one portion 16 of the dowel 14 is greased, painted or otherwise coated.
  • the remaining portion 17 of the dowel 14 is not coated. Curing of the concrete causes portions 17 of dowel to key to slab 10.
  • the coated portion of the dowel 11 is free to work in expansion and contraction when either curing contraction or thermal expansion and/or loading results in expansion joint flexure.
  • dowel 14 be normal to the plane of the expansion joint between the slabs 10, 11. Thus toward and away expansion can be accommodated without the destruction of the panels from the edges as previously described.
  • a typical dowel_inserter A includes inserter support bar 24 dependingly supporting individual inserter support plate 25.
  • the failure to install insulators has resulted in failure of the- prior art devices.
  • Support plate 25 has conventionally joined two tangs 30. Tangs 30 at the upper end thereof define a square aperture 32 into which vibrator V is received. Aperture 32 has mounted thereto clamps such that vibrator V is firmly captured therein so the vibrational energy is readily transferred to the tangs 30.
  • An electromagnet E is mounted between tangs 30. Fabrication and installation of this electromagnet is not trivial.
  • the electromagnet is fabricated so there is no relative movement between any of the parts of the electromagnet and the two tangs 30 to which it is braced and cross connected.
  • the vibrator V will literally destroy the electromagnet E in case any portion of the magnet comes free from the entire assembly and begins to vibrate.
  • the electromagnet in the vicinity of its fastening to the respective tang 30 is securely mounted. Relative movement between the electromagnet E and its point of mounting not only causes failure of the magnet to communicate its magnetic field to the tangs 30, but additionally also effectively destroys the magnet.
  • Each of the arms 30 has a magnetic portion 35 and non-magnetic portion 34.
  • Non-magnetic portion 34 can be seen to terminate just above magnet E. This non-magnetic portion 34 prevents the field of the electromagnet from being communicated upwardly to the inserter support plate 25.
  • Magnetic portion 35 of the tang enables the field of the magnet to be communicated down to and towards the bottom portion of the tangs 30.
  • the vibrator V comprises an eccentrically weighted shaft mounted to bearings.
  • the shaft is in turn driven by a motor, the motor -here being shown as hydraulic. Electric motors can be used as well.
  • each of the tangs 30 is provided with a rounded section 36.
  • Rounded section 36 is configured to extend up and over a dowel. This half-round aperture is flared so that when the inserter A comes down over a dowel 14, a gathering of the dowel to a central position occurs.
  • the half-rounded or arcuate portion of the tangs must be configured to precisely fit over the dowel 14. Anything less than a precise fit will not allow the vibrational energy of the vibrator V to be communicated to the dowel 14.
  • the tangs at lower portion 35 must be of sufficient length to permit dowel penetration into the slab. Consequently, the lower portion of the arms 30 are usually tailored to the specific construction being undertaken by the dowel inserter. In actual practice, they are welded in place, used for a particular job, and thereafter cut off and replaced. Specifically, they are given a length so that required elevational insertion from line and grade is accommodated. Moreover, individual inserters are given variable side to side spacing so that the specified side to side spacing between dowels is likewises accommodated. In short, simple machine modifications before a job enables high productivity once paving is commenced. As those skilled in the art are aware, tailoring of the machine for a particular job is desirable.
  • the lowermost portion 37 of the arms 30 is provided with a relatively constant cross section. This portion 37 has the greatest penetration into the slab.
  • a magazine of cylindrical rods is illustrated having an angularly sloping section 40 extending to a vertical section 42. As can be seen, the rods are confined in single file down a feed mechanism 43.
  • Sloping section 40 typically has rods 14 placed therein sufficient to constitute a complete joinder across a concrete panel. Once the rods 14 are loaded in section 40 they are released by a release handle 39. Upon release at the release handle 39, they travel en masse down to vertical section 42. At vertical section 42 they are held until released by the conveyor mechanism.
  • Feed mechanism 43 includes a spring loaded arm 44 maintaining each of the individual rods 14 over paired travelling endless chain belts 46. Endless chain belts have pawls 47 and keeper bars 48 sequentially fastened thereto.
  • keeper bars 48 pass under a rod 14 at the bottom of vertical section 42.
  • Pawls 47 dislodge rod 14 and pivot the arms 44 out of the way.
  • chains 46 continue movement until a limit switch 49 detects the presence of a dowel at the end of the conveyed path. The endless chains then stop.
  • the dowels are distributed at even spatial intervals fully along the length of the conveyor. It is in this disposition that they are picked up by a group of inserters A as illustrated in Fig. 3.
  • a vertical channel 113 conveys the rods single file to a dispenser.
  • a block 115 holds the dispensed rods free and clear of the passing chain 46, the pawl 47 and the keeper bar 48.
  • the bottom-most bar 14 is biased to and toward the direction of travel of the chain with a springloaded retainer bar 111 stopping the respective bars from falling out in an unlimited number on the surface of the chain 46.
  • vertical channel 113 is provided with a forwardly angled backpiece 112.
  • keeper bar 48 passes under the bars 14 and that pawl 47 dislodges the bars 14. This dislodgement occurs against the pivoting retainer bar 111.
  • Fig. 5D it is seen that the chain 46 causes the bar 14 as followed by pawl 47 to be dispensed on the chain while the next in order dowel 14 is held in place by pivoting retainer bar 111.
  • the sequence of dispensing of the bars can easily be understood.
  • the inserters A can take a number of different embodiments. Such a differing embodiment is illustrated in the view of Fig. 3.
  • beam 63 has extended on either side thereof respective support plates 64, 65. These plates in turn dependingly support a support beam 66.
  • Support beam 66 is mounted from plates 64, 65 by a group of isolaters, there being approximately 6 isolaters for the support of five inserters A.
  • TM Minnick "H1200"
  • the amount of vibrational energy communicated to the rod inserters is important. Specifically, and dependent upon the slump of the concrete, vibrational energy of varying amounts will be required. It has been found, for example, that where the slump is low - in the range of 6.35 mm (41 inch) to 25.4 mm (one inch) high vibrational energy is preferred. In this case, the inserter of Fig. 1 is used. In this case, the vibrator is installed to each inserter. Such relatively low slump concrete is commonly used on airport runways and European highways.
  • inserters A The construction of inserters A is similar. Specifically, the inserters have magnetic portions 68 with an electromagnet E therebetween. Small stainless steel sections 69 at the top of magnetic portions 68 confine the magnetic path down the respective arms 68 and across any dowels 14 that are held by the unit.
  • a group of dowels may be picked up by an assembly of inserters A as illustrated in Fig. 3. With this arrangement individual inserters can be removed, serviced and replaced. Consequently, repair of inserters damaged at their vibrators or magnets is possible. Moreover, downtime of the dowel inserting machine is maintained at a minimum.
  • a slip form paver 100 having a finishing beam 101 is shown progressively applying concrete 102 between a grade level 103 and the slipping form 114.
  • the machine is furnished with means that give the slipping form 114 and all other portions of the machine a reference to grade and line.
  • dowel inserting invention can be mounted to any number of mechanisms and that the invention is not confined to the slip form paver here illustrated. Indeed any machine which rides on rails over freshly poured and uncured concrete panels will supply a sufficient platform. It is necessary that the machine be provided with adequate reference to line and grade.
  • the group of inserters must be mounted to a frame mounted railway 105 at a moving car 104 (only shown schematically in Fig. 3). This enables the car 104 to slide back and forth overlying the concrete panels.
  • hydraulic cylinder 107 is utilized. Cylinder 107 causes the car to slide forwardly and backwardly.
  • a cylinder 109 is here shown causing movement of the inserters A into and out of the pavement.
  • Wire brush 110 is present. The wire brush causes the ends of inserters A to be cleaned immediately after retraction from the freshly poured concrete.
  • the endless belt 46 has disposed a group of rods 14 for pick-up.
  • the electromagnet across each of the inserters has been turned on and the inserters have come down on and over the respective dowels 14. At this particular time the vibrators are off.
  • Dowels 14 have been slightly elevated by the inserters.
  • slabs 10, 11 are shown with an expansion joint area 15 therebetween.
  • Hydraulic cylinder 107 has commenced to expand so as to maintain car 104 stationary over the expansion joint area 15 between slabs 10, 11, it being realized that the expansion joint will not be installed until after the rods are inserted.
  • the dowels 14 are held by the inserter A immediately over the joint area 15. Note that at this juncture, it is possible for observation of the dowels relative to the expansion joint area 15 to occur.
  • the inserters A will have lowered the dowels 14 across the expansion joint 15 between slabs 10, 11.
  • the magnets E will remain on and the vibrator V will be turned on immediately before insertion commences.
  • the three stage cylinder 107 is released and the carriage allowed to freely wheel along the railway 105 so that there is no relative movement between the group of inserters A and the passing concrete slaps 10, 11.
  • the vibrational energy imparted has the effect of fluidizing the concrete.
  • the concrete is fluidized in and around the rod 14 and the inserter A.
  • the dowel freely passes into and through the freshly poured concrete slab along a full fluidized path.
  • the respective solid and fluid areas are denoted on the drawing and only illustrative of the state of the slab when dowel 14 has arrived at its full depth of penetration.
  • Insertion in actual practice occurs to a depth as required by specification for a particular job.
  • insertion could be approximately half of the slab width, in the illustrated case in the order of 12.7 cm (five inches) of a 25.4 cm (ten inch) slab.
  • the disclosed vibrations do not interfere with the slab.
  • the apparatus and process leaves the surface of the slab substantially undisturbed and does not affect or classify either the aggregate, cement or sand constituents of the concrete.
  • retraction of the inserters A is illustrated.
  • the dowels 14 are placed.
  • the magnet is turned off and the retractors moved a small distance. Thereafter when the tangs of the retractors clear the dowels, the vibrators are restarted.
  • cyinder 107 is shown with drawing carriage 104 and inserters A over the wire brush 110.
  • Wire brush 110 cleans the bottom of the inserters of any cement or grout that may remain thereon and enables a clean metal-to- metal contact to occur when the next rods are picked up.
  • the oscillating finishing beam 101 finishes over the surface of the concrete. Any blemish left in the slab by the withdrawal of the inserters A is avoided.
  • the vibrators function to fluidize the concrete. Concrete on the bottom of the tangs 30 will be fluidized also. In the fluidized states, the wire brushing has the maximum cleaning effect.

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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)

Claims (11)

1. Vorrichtung zum Einbringen von Dübeln in die Dehnungsfugen von frisch gegossenen Betonplatten mit einem ersten und einem zweiten Dübelarm (30) zum Einbringen eines Dübels (14) in eine Betonplatte (10, 11), wobei beide Arme mit einer Ausnehmung (36) zur Aufnahme eines Dübels versehen sind, mit Mitteln (E) zum Halten des Dübels (14) an den Armen (30) vor dem Einbringen, mit einem Einbringmechanismus (A) zum Eindrücken der mit einem Dübel (14) versehenen Arme (30) in die Betonplatte (10, 11) und zum nachfolgenden Herausziehen der Arme aus dem Beton; mit einem Vibrator (V) zum Vibrieren eines von den Armen (30) gehaltenen Dübels (14) während des Einbringens mit einer Vibrationsenergie, die ausreicht, den frisch gegossenen Beton im Einbringbereich zu verflüssigen, dadurch gekennzeichnet, daß das genannte Haltemittel (E) magnetisch wirkt und sich zwischen den beiden Armen (30) erstreckt und in aktiviertem Zustand mit den Armen (30) und dem von diesen gehaltenen Dübel (14) einen Magnetkreis bildet und daß die Arme (30) über einen Schwingungsisolator (26) mit einem Traggestell verbunden sind.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Arme (30) jeweils einen Teil (35) aus magnetisch leitendem Material und einen Teil (34) aus nicht-magnetischleitendem Material aufweisen, so daß ein definierter Magnetkreis gegeben ist durch die Teile (35) aus magnetischleitendem Material der Arme und dem Dübel (14).
3. Vorrichtung nah Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Magnetkreis einen fest mit und zwischen den Armen (30) verbundenen Elektromagneten (E) aufweist.
4. Vorrichtung nach einem der vorangegangenen Ansprüche, gekennzeichnet durch einen Rahmen (63-66) für die Ausrichtung der Anordnung in etwa gleichbleibender Höhe über einer frisch gegossenen Betonplatte.
5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß der Rahmen (63-66) eine Mehrzahl von Armpaaren (30) trägt.
6. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß mehrere Vibratoren (V,) an einem Balken (66) angeordnet sind, an dem eine Mehrzahl von nach unten weisenden Armpaaren (30) befestigt ist, wobei die Zahl der Armpaare (30) größer ist als die Zahl der Virbratoren (V1).
7. Vorrichtung nach Anspruch 5 oder 6, dadurch gekennzeichnet, daß die Anordnung bewegbar mit dem Rahmen (63-66) verbunden ist.
8. Vorrichtung nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, daß Einrichtungen (101) zum Finieren der Platten (10, 11) nach dem Einbringen eines Dübels (14) vorgesehen sind.
9. Vorrichtung nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, daß Mittel (110) zum Reinigen der Arme (30) vorgesehen sind.
10. Verfahren zum Einbringen eines Dübels in wenigstens eine frisch gegossene Betonplatte mittels zweier nach unten gerichteter, einen Dübel (14) haltenden Armen (30) durch Eindrükken des Dübels (14) und der Arme (30) in wenigstens eine Betonplatte durch Aufbringen von Virbrationsenergie auf Dübel (14) und Arme (30) in solcher Größe, daß der Beton im Bereich des einzubringenden Dübels verflüssigt wird, Lösen der Arme (30) von Dübel (14) und Zurückziehen, dadurch gekennzeichnet, daß der Dübel (14) an den Armen (30) durch Erzeugung eines den Dübel (14) mit einbeziehenden magnetischen Flusses gehalten wird, daß der Vibrator kurzfristig abgeschaltet wird, wenn die Arme von dem eingebrachten Dübel gelöst werden und wieder eingeschaltet wird, wenn die Arme aus der Betonplatte herausgezogen werden, und daß die Schwingungen der Arme (30) und des Dübels (14) vom Gestell ferngehalten werden.
11. Verfahren nach Anspruch 10, dadurch gekennzeichnet, daß die Arme (30) beim Zurückziehen gereinigt werden.
EP19830300675 1983-02-10 1983-02-10 Vorrichtung und Verfahren zum Einbringen von Dübeln in die Fugen von Betondecken Expired EP0117323B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19830300675 EP0117323B1 (de) 1983-02-10 1983-02-10 Vorrichtung und Verfahren zum Einbringen von Dübeln in die Fugen von Betondecken
DE8383300675T DE3373200D1 (en) 1983-02-10 1983-02-10 Apparatus and process for dowel insertion to concrete panel joints

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19830300675 EP0117323B1 (de) 1983-02-10 1983-02-10 Vorrichtung und Verfahren zum Einbringen von Dübeln in die Fugen von Betondecken

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EP0117323A1 EP0117323A1 (de) 1984-09-05
EP0117323B1 true EP0117323B1 (de) 1987-08-26

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DE3660455D1 (en) * 1985-04-02 1988-09-08 Moser Andreas Apparatus for driving and positioning dowels into concrete slabs
AT399963B (de) * 1987-12-18 1995-08-25 Elin Oltc Gmbh Stufenschalter Überschalt-widerstand i
FR2747698B1 (fr) * 1996-04-23 2003-11-14 Cegelec Procede pour mette en place avec precision un insert dans du beton, dispositif pour la mise en oeuvre de ce procede, et voie de chemin de fer obtenue par ce procede
US6099204A (en) * 1996-08-13 2000-08-08 Godbersen; Gary L. Apparatus for inserting dowel bars in a concrete slip forming machine
DE19904797C1 (de) * 1999-02-05 2000-12-28 Wirtgen Gmbh Vorrichtung zum Einbringen von Dübeln in frisch verlegte Fahrbahndecken
US6341919B1 (en) * 2000-06-07 2002-01-29 Southpac Trust Int'l Inc. Threaded side bar inserter
DE10200852B4 (de) * 2002-01-11 2004-03-18 Walter-Heilit Verkehrswegebau Gmbh Vorrichtung zum Vorsehen einer Reihe nebeneinander angeordneter Einbauelemente in einer nicht ausgehärteten Betonlage

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DE3373200D1 (en) 1987-10-01

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