EP2238297B1 - Device for compacting road paving materials - Google Patents

Device for compacting road paving materials Download PDF

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Publication number
EP2238297B1
EP2238297B1 EP09706156.8A EP09706156A EP2238297B1 EP 2238297 B1 EP2238297 B1 EP 2238297B1 EP 09706156 A EP09706156 A EP 09706156A EP 2238297 B1 EP2238297 B1 EP 2238297B1
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EP
European Patent Office
Prior art keywords
heating element
strip
cavity
tamper
heating
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EP09706156.8A
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German (de)
French (fr)
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EP2238297A1 (en
Inventor
Anton Mahler
Marc Niggemann
Oliver Lachmann
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ABG Allgemeine Baumaschinen GmbH
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ABG Allgemeine Baumaschinen GmbH
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Publication of EP2238297A1 publication Critical patent/EP2238297A1/en
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/22—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for consolidating or finishing laid-down unset materials
    • E01C19/30—Tamping or vibrating apparatus other than rollers ; Devices for ramming individual paving elements
    • E01C19/34—Power-driven rammers or tampers, e.g. air-hammer impacted shoes for ramming stone-sett paving; Hand-actuated ramming or tamping machines, e.g. tampers with manually hoisted dropping weight
    • E01C19/40—Power-driven rammers or tampers, e.g. air-hammer impacted shoes for ramming stone-sett paving; Hand-actuated ramming or tamping machines, e.g. tampers with manually hoisted dropping weight adapted to impart a smooth finish to the paving, e.g. tamping or vibrating finishers
    • E01C19/407—Power-driven rammers or tampers, e.g. air-hammer impacted shoes for ramming stone-sett paving; Hand-actuated ramming or tamping machines, e.g. tampers with manually hoisted dropping weight adapted to impart a smooth finish to the paving, e.g. tamping or vibrating finishers with elements or parts partly or fully immersed in or penetrating into the material to act thereon, e.g. immersed vibrators or vibrating parts, kneading tampers, spaders
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/48—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ
    • E01C19/4833—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ with tamping or vibrating means for consolidating or finishing, e.g. immersed vibrators, with or without non-vibratory or non-percussive pressing or smoothing means
    • 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
    • E01C2301/00—Machine characteristics, parts or accessories not otherwise provided for
    • E01C2301/10—Heated screeds

Definitions

  • the invention relates to a device for compacting road building materials according to the preamble of claim 1.
  • Such a device is known from DE 26 00 108 A1 .
  • a screed is attached, which is preceded by a rammer for pre-compression of the paving material.
  • the bituminous mixture which is in a warm state, sticks to the cold ramming bar.
  • the adhesive material adhering to the ramming bar leaves grooves in the lining, which can no longer be removed by the subsequent screed and therefore remain on the surface of the road surface.
  • it is known to heat the tamper strip The use of a gas burner was replaced by an electric heater, which in an open or closed Hollow profile, which forms the tamper strip is inserted. The electric heater is then inside the tamper strip.
  • Out EP 0 641 887 B1 is a paver and tool known as a tamper strip for a screed.
  • the tamper strip forms a channel between a support part and a wearing part, in which a heating element, in particular a heating element, is provided.
  • the heating element is a flat electric heating element, which is shielded by an insert upwards.
  • the supplement ensures that the heating element is clamped, so that there is the largest possible contact surface for the heat conduction.
  • the disadvantage here is that the heating element breaks frequently. The replacement of a defective heating element leads to undesirable downtime of the paver. The maintenance is increased.
  • the heating capacity is further determined by the contact heat.
  • the object of the invention is therefore to provide a device for compacting road construction materials according to the preamble of claim 1, whose heating element is low maintenance and has good heating capacity.
  • a tamper strip is provided with an electric heating element whose heating element is particularly robust as round tubular heater and easy to handle by connecting to a terminal block.
  • the heat distribution is improved by the arrangement of the rods. Due to its length and deformability, the round tube radiator gives a better picture than a flat tube radiator.
  • the recess in the tamper strip can be made smaller, so that the heat losses due to convection can be kept low.
  • the attachment of the round tubular heater can be done by means of clamping by a stop plate or by an elastic deformation.
  • Elastic deformation can be applied a statically acting energy storage by utilizing the elastic deformation.
  • the originating example of human muscle energy when inserting the heating element in the recess of the tamper bar is stored in a suitable manner.
  • the energy storage element acts preferably in the direction of the beating up and down movement for storing the heating element.
  • the heating element is thus supported and fixed within the tamper strip on the length. In a hammering rammer, the heating element must be secured against vibrations for purely mechanical reasons. The heating element is therefore protected against vibration.
  • the round tube heating element is designed as a heating rod in corrugated or zigzag-like shape.
  • the resilient property of the heating element is utilized. This can be clamped by loaded corrugation in the rammer independently.
  • the tamper strip is a horizontally split construction having a support and a blow bar.
  • a groove is provided in which the heating element is located. After wearing the blow bar so the support bar can remain on the machine and continue to be used. The groove is thus not in the wear part.
  • the blow bars can be kept inexpensive.
  • the blow bars can be designed in several parts and bridged by a cover plate. The connection surfaces are thereby sealed.
  • the paver 1 includes a chassis 2, a drive unit 3, a forward lying in the direction of travel Gutbunker 4 and a rear auger 5. With lateral arms 6 a screed 7 is towed, which transported from the Gutbunker 4 to the rear, installed by the auger 5 built-in building material.
  • the screed 7 is preferably a vibration screed that smoothes and compacts.
  • At the front in the direction of travel F side of the screed 7 at least one rammer 8 is arranged, as in Fig. 1b is shown.
  • To Fig. 1b are two rammers 8 arranged one behind the other. It is therefore a Doppelstampfer screed.
  • a rammer 8 may also be arranged downstream of the screed 7.
  • the screed 7 can be laterally extendable with a fixed working width or for larger working widths as an extendable screed.
  • the arranged in the direction of travel F in front of the screed 7 ram 8 operates as a precompression element.
  • the rammer described below 8 may preferably additionally or alternatively the screed 7 be arranged downstream.
  • the rammer 8 has a tamper strip 9 which can be driven for a striking upward and downward movement.
  • a drive 10 is provided for driving the tamper strip 9.
  • the interior of the tamper strip 9 is equipped with an electric heater in the form of a rod-shaped, can be clamped in a recess 11 of the tamper strip 9 heating element 12.
  • the heating element 12 is formed by a round tubular heater whose heating coil 20 is folded over at a free end of the round tubular heater at least once to form two adjacently arranged rods 33, 34th
  • Fig. 2 are the two rods 33, 34 next to each other.
  • Fig. 3 are the two rods 33, 34 on top of each other.
  • a retaining strip 31 is provided which presses the heating element 12 by means of screws 32 on a bottom 26 of the recess 11, so that this is free of play in the recess 11.
  • Fig. 3 is for clamping the heating element 12, a heating element 12 in the direction of the beating up and down movement S stored spring storage provided.
  • the spring accumulator causes a clamping by elastic deformation.
  • the spring accumulator clamps the heating element 12 along the recess 11 such that the heating element 12 is stabilized or free of play in the recess 11.
  • the thermal expansion of the heating element 12 in the direction of a free end 13 is given.
  • the recess 11 may have a round or angular cross-section, it may be formed by a core hole or it may be formed as a closed groove.
  • connection block 14 replacement of the heating element 12 is noticeably easier if it is fastened only on the front side of the rammer 8 via a connection block 14.
  • the heating element 12 is electrically connected via the terminal block 14 to a power source, for which a connection cable 19 is provided.
  • the terminal block 14 is attached to the tamper strip 9.
  • the heating element 12 is preferably formed as a corrugated, kinked or zigzag-shaped heating element whose elastic shape change forms the spring accumulator.
  • the heating element 12 is seated elastically biased in the recess 11 of the tamper strip 9.
  • the recess 11 extending along the tamper strip 9 thus has dimensions, in particular in height and in width, the elastic deformation of the heating element 12 and thus the bias determined (cf. Fig. 6 ).
  • the elastic deformation of the heating element 12 is exploited, to which the strength of the corrugation or the zigzag shape of the heating element is selected with respect to the recess 11.
  • Fig. 6 shows, for example, the originating from human muscle energy (when inserting the heating element 12) to build the static acting spring accumulator taking advantage of the elastic deformation.
  • the independent terminals of heating elements as heating elements 12 is independent of the tube shape.
  • the number of waves of kinks 15, 16, 17, 18 may vary. At least one kink is required.
  • the axis of the buckling can vary. According to Fig. 3 the kinks are in one plane. But this is not mandatory.
  • Fig. 6 shows the insertion of a heating element 12 according to Fig. 3 in the recess 11 of the tamper strip 9.
  • the resilient clamping action can finally from the actual heating element 12 to be separated.
  • an additional, unheated side dish in wave or kink shape is used to clamp the heating element 12, as in Fig. 7, 8 is shown.
  • the heating element 12 is formed as Rundrohrsammlungstab.
  • This Rundrohrsammlungstab has only one heating coil 20, the free end 13 is folded and returned. Beginning 21 and end 22 of a heating coil 20 are connected to the one terminal block 14 and fastened.
  • the heating coil 20 transfers heat to the tamper strip 9, wherein the contact with the tamper strip 9 is no longer a priority as in Flachrohrsammlung redesignn.
  • the folded heating coil 20 forms a heating package with two superimposed or juxtaposed rods 33, 34 of the heating coil 20 of a round tubular heater, which are connected in a common terminal block 14 with an electrical lead 19.
  • the according to Fig. 3 provided four kinks 15, 16, 17, 18 are chosen so that the heating element 12 builds enough spring tension to clamp during the operation of the rammer 8 sufficiently in the tamper strip 9.
  • the heating element 12 as a round tubular heater has a good bending property.
  • the tamper strip 9 preferably comprises a support bar 23 and a beater bar 24.
  • the tamper bar 9 is thus divided horizontally.
  • To form the recess 11 in an enclosed space of the tamper strip 9 is preferably in the support bar 23 has a groove 25 in which the heating element 12 is located.
  • the groove 25 is closed by a top surface 26 of the beater bar 24 to form the recess 11.
  • the support bar 23 remain on the paver 1 and continue to be used.
  • the groove 25 can thus be mounted in a non-wearing part.
  • the blow bar 24 may consist of several blow bar segments.
  • the blow bar segments can be bridged by a cover plate.
  • the cover plate can then form the top surface 26 for limiting the recess 11.
  • the blow bar 24 is also preferably formed as a thin-walled profile.
  • the support bar 23 is adaptable as a supporting body to the conditions of use.
  • the support bar 23 on the head side have a protruding base 30 for component stiffening.
  • the recess 11 is formed in a tamper strip 9, wherein the support bar 23 is integrally formed with the beater bar 24.
  • the recess 11 can then be formed for example by a core hole.
  • FIG. 4 and FIG. 5 show the tamper strip 9 according to Fig. 3 with two superimposed rods of the heating coil 20 of a round tubular heater.
  • the recess 11 is closed at the front side of the tamper strip 9 by the connection block 14.
  • Fig. 6 shows, prior to installation, the heating element 12 is more kinked than in the mounted state.
  • the heating element 12 is pushed laterally into the groove 25 between the support bar 23 and beater bar 24. Meanwhile, the heating element 12 deforms elastically and possibly proportionally plastically far enough in a prestressed form that it fills the groove 25. The proportion of elastic deformation causes the clamping.
  • the length of the recess 11 is dimensioned such that the heating element 12 can expand to the free end by sliding movement.
  • Fig. 5 shows, the heating element 12 is completely enclosed in the closed system of the recess 11 of the tamper strip. No direct contact between heating element 12 as a round tubular heater and blow bar 24 is required.
  • the surface temperature of the round tubular heater increases with respect to a Flachrohrutzoasa with contact.
  • the round tube heater is suitable for this higher temperature.
  • the proportion of the heat flow from the reduced contact heat transfer of the round tubular heater is thus distributed in particular to the heat radiation and the convection as heat transfer types.
  • FIGS. 7 and 8 is provided as a spring storage a corrugated or kinked insert 27 whose elastic shape change forms the spring accumulator.
  • the resilient clamping action is here separated from the actual heating element 12.
  • the supplement 27 is an additional, preferably unheated element in wave or kink shape, which clamps the heating element 12.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Paving Machines (AREA)

Description

Die Erfindung betrifft eine Vorrichtung zum Verdichten von Straßenbaustoffen nach dem Oberbegriff des Anspruchs 1.The invention relates to a device for compacting road building materials according to the preamble of claim 1.

Eine derartige Vorrichtung ist bekannt aus DE 26 00 108 A1 . An dem Straßenfertiger ist danach eine Glättbohle befestigt, der ein Stampfer zur Vorverdichtung des Einbaumaterials vorgeordnet ist. Beim Beginn eines Einbauvorganges kommt es nun vor, dass das bituminöse, in warmem Zustand befindliche Mischgut an der kalten Stampferleiste kleben bleibt. Das an der Stampferleiste klebende Mischgut hinterlässt jedoch Rillen in dem Belag, die von der nachfolgenden Glättbohle nicht mehr beseitigt werden können und daher auf der Oberfläche der Fahrbahndecke verbleiben. Zur Vermeidung dieser Rillen beim Beginn eines Einbauvorganges ist es bekannt, die Stampferleiste zu beheizen. Die Verwendung eines Gasbrenners wurde dabei ersetzt durch eine elektrische Heizung, die in ein offenes oder geschlossenes Hohlprofil, das die Stampferleiste bildet, eingesetzt ist. Die elektrische Heizung befindet sich dann im Inneren der Stampferleiste.Such a device is known from DE 26 00 108 A1 , On the paver then a screed is attached, which is preceded by a rammer for pre-compression of the paving material. At the beginning of an installation process, it now happens that the bituminous mixture, which is in a warm state, sticks to the cold ramming bar. However, the adhesive material adhering to the ramming bar leaves grooves in the lining, which can no longer be removed by the subsequent screed and therefore remain on the surface of the road surface. To avoid these grooves at the beginning of an installation process, it is known to heat the tamper strip. The use of a gas burner was replaced by an electric heater, which in an open or closed Hollow profile, which forms the tamper strip is inserted. The electric heater is then inside the tamper strip.

Aus EP 0 641 887 B1 ist ein Deckenfertiger und Werkzeug als Stampferleiste für eine Einbaubohle bekannt. Die Stampferleiste bildet zwischen einem Trägerteil und einem Verschleißteil einen Kanal, in dem ein Heizelement, insbesondere ein Heizstab, vorgesehen ist. Das Heizelement ist ein elektrischer Flachrohrheizkörper, der durch eine Beilage nach oben abgeschirmt ist. Die Beilage stellt dabei sicher, dass das Heizelement festgeklemmt ist, so dass sich eine möglichst große Kontaktfläche für die Wärmeleitung ergibt. Nachteilig hierbei ist, dass das Heizelement häufig bricht. Der Austausch eines defekten Heizelementes führt zu unerwünschten Stillstandszeiten des Straßenfertigers. Der Wartungsaufwand ist erhöht. Das Heizvermögen wird ferner durch die Kontaktwärme bestimmt.Out EP 0 641 887 B1 is a paver and tool known as a tamper strip for a screed. The tamper strip forms a channel between a support part and a wearing part, in which a heating element, in particular a heating element, is provided. The heating element is a flat electric heating element, which is shielded by an insert upwards. The supplement ensures that the heating element is clamped, so that there is the largest possible contact surface for the heat conduction. The disadvantage here is that the heating element breaks frequently. The replacement of a defective heating element leads to undesirable downtime of the paver. The maintenance is increased. The heating capacity is further determined by the contact heat.

Aufgabe der Erfindung ist es daher, eine Vorrichtung zum Verdichten von Straßenbaustoffen nach dem Oberbegriff des Anspruchs 1 zu schaffen, dessen Heizelement wartungsarm ist und ein gutes Heizvermögen besitzt.The object of the invention is therefore to provide a device for compacting road construction materials according to the preamble of claim 1, whose heating element is low maintenance and has good heating capacity.

Diese Aufgabe wird erfindungsgemäß durch die Merkmale des Anspruchs 1 gelöst.This object is achieved by the features of claim 1.

Hierdurch wird eine Stampferleiste mit einem elektrischen Heizelement geschaffen, dessen Heizelement als Rundrohrheizkörper besonders robust und durch den Anschluss an einen Anschlussblock einfach handhabbar ist. Die Wärmeverteilung wird durch die Anordnung der Stäbe verbessert. Der Rundrohrheizkörper liefert aufgrund seiner Länge und Verformbarkeit ein besseres Bild als ein Flachrohrheizkörper. Mit einem Rundrohrheizkörper kann schließlich die Ausnehmung in der Stampferleiste kleiner dimensioniert werden, so dass die Wärmeverluste durch Konvektion gering gehalten werden können.As a result, a tamper strip is provided with an electric heating element whose heating element is particularly robust as round tubular heater and easy to handle by connecting to a terminal block. The heat distribution is improved by the arrangement of the rods. Due to its length and deformability, the round tube radiator gives a better picture than a flat tube radiator. Finally, with a round tubular heater, the recess in the tamper strip can be made smaller, so that the heat losses due to convection can be kept low.

Die Befestigung des Rundrohrheizkörpers kann mittels Klemmung durch eine Haltplatte oder durch eine elastische Verformung erfolgen. Bei Klemmung durch elastische Verformung kann ein statisch wirkender Energiespeicher unter Ausnutzung der elastischen Formänderung angewendet werden. Die beispielsweise von menschlicher Muskelkraft herrührende Energie beim Einsetzen des Heizelementes in die Ausnehmung der Stampferleiste wird so in geeigneter Weise gespeichert. Das Energiespeicherelement wirkt dabei vorzugsweise in Richtung der schlagenden Auf- und Abwärtsbewegung zum Lagern des Heizelementes. Das Heizelement wird so innerhalb der Stampferleiste auf der Länge gestützt und befestigt. In einem schlagenden Stampfer muss das Heizelement aus rein mechanischen Gründen gegen Schwingungen gesichert werden. Das Heizelement ist deshalb vor Vibration geschützt.The attachment of the round tubular heater can be done by means of clamping by a stop plate or by an elastic deformation. When clamped by Elastic deformation can be applied a statically acting energy storage by utilizing the elastic deformation. The originating example of human muscle energy when inserting the heating element in the recess of the tamper bar is stored in a suitable manner. The energy storage element acts preferably in the direction of the beating up and down movement for storing the heating element. The heating element is thus supported and fixed within the tamper strip on the length. In a hammering rammer, the heating element must be secured against vibrations for purely mechanical reasons. The heating element is therefore protected against vibration.

Vorzugsweise ist der Rundrohrheizkörper als Heizstab in gewellter Form bzw. zickzackartiger Form ausgeführt. Zur Befestigung wird die federnde Eigenschaft des Heizstabes ausgenutzt. Dieser kann sich durch belastete Wellung in dem Stampfer selbstständig klemmen.Preferably, the round tube heating element is designed as a heating rod in corrugated or zigzag-like shape. For attachment, the resilient property of the heating element is utilized. This can be clamped by loaded corrugation in the rammer independently.

Alternativ ist die Verformung eines im unbelasteten Zustand geraden Rundrohrheizkörpers durch geeignete Widerlage, wie beispielsweise eine gewellte Beilage, möglich, um die nötige Klemmkraft aufzubringen.Alternatively, the deformation of a straight in the unloaded state Rundrohrheizkörpers by suitable abutment, such as a corrugated shim, possible to apply the necessary clamping force.

Vorzugsweise ist die Stampferleiste eine horizontal geteilte Konstruktion, die eine Trag- und eine Schlagleiste aufweist. Vorzugsweise innerhalb der Tragleiste ist eine Nut vorgesehen, in der sich das Heizelement befindet. Nach Verschleißen der Schlagleiste kann so die Tragleiste an der Maschine verbleiben und weiter verwendet werden. Die Nut befindet sich somit nicht im verschleißenden Teil. Durch diese Wahl können die Schlagleisten kostengünstig gehalten werden. Die Schlagleisten können dabei mehrteilig ausgebildet und mittels eines Deckblechs überbrückt sein. Die Anschlussflächen werden hierdurch abgedichtet.Preferably, the tamper strip is a horizontally split construction having a support and a blow bar. Preferably within the support bar a groove is provided in which the heating element is located. After wearing the blow bar so the support bar can remain on the machine and continue to be used. The groove is thus not in the wear part. By choosing this, the blow bars can be kept inexpensive. The blow bars can be designed in several parts and bridged by a cover plate. The connection surfaces are thereby sealed.

Weitere Ausgestaltungen der Erfindung sind der nachfolgenden Beschreibung und den Unteransprüchen zu entnehmen.Further embodiments of the invention are described in the following description and the dependent claims.

Die Erfindung wird nachstehend anhand der in den beigefügten Abbildungen dargestellten Ausführungsbeispiele näher erläutert.

  • Fig. 1a zeigt eine schematische Seitenansicht eines Deckenfertigers,
  • Fig. 1b zeigt schematisch eine Schnittdarstellung einer Glättbohle,
  • Fig. 2 zeigt schematisch im Schnitt eine Stampferleiste gemäß einem ersten Ausführungsbeispiel,
  • Fig. 3 zeigt schematisch im Schnitt eine Stampferleiste gemäß einem zweiten Ausführungsbeispiel,
  • Fig. 4 zeigt schematisch im Schnitt eine Stampferleiste gemäß einem dritten Ausführungsbeispiel,
  • Fig. 5 zeigt schematisch einen Schnitt A-A gemäß Fig. 4,
  • Fig. 6 zeigt schematisch einen Schnitt gemäß Fig. 4 beim Einsetzen des Heizelementes,
  • Fig. 7 zeigt schematisch im Schnitt eine Stampferleiste gemäß einem vierten Ausführungsbeispiel,
  • Fig. 8 zeigt schematisch einen Schnitt G-G gemäß Fig. 7.
The invention will be explained in more detail with reference to the embodiments illustrated in the accompanying drawings.
  • Fig. 1a shows a schematic side view of a paver,
  • Fig. 1b schematically shows a sectional view of a screed,
  • Fig. 2 shows schematically in section a tamper strip according to a first embodiment,
  • Fig. 3 shows schematically in section a tamper strip according to a second embodiment,
  • Fig. 4 shows schematically in section a tamper strip according to a third embodiment,
  • Fig. 5 schematically shows a section AA according to Fig. 4 .
  • Fig. 6 schematically shows a section according to Fig. 4 when inserting the heating element,
  • Fig. 7 shows schematically in section a tamper strip according to a fourth embodiment,
  • Fig. 8 schematically shows a section GG according to Fig. 7 ,

Der Straßenfertiger 1 gemäß Fig. 1a umfasst ein Fahrwerk 2, ein Antriebsaggregat 3, einen in Fahrtrichtung vorne liegenden Gutbunker 4 und eine hinten liegende Verteilerschnecke 5. Mit seitlichen Auslegern 6 wird eine Glättbohle 7 geschleppt, die aus dem Gutbunker 4 nach hinten transportiertes, von der Verteilerschnecke 5 verteiltes Einbaugut einbaut. Die Glättbohle 7 ist vorzugsweise eine Vibrationsbohle, die glättet und verdichtet. An der in Fahrtrichtung F vorne liegenden Seite der Einbaubohle 7 ist mindestens ein Stampfer 8 angeordnet, wie in Fig. 1b dargestellt ist. Nach Fig. 1b sind zwei Stampfer 8 hintereinander angeordnet. Es handelt sich demnach um eine Doppelstampfer-Bohle. Ein Stampfer 8 kann ferner auch der Glättbohle 7 nachgeordnet sein. Die Glättbohle 7 kann mit fester Arbeitsbreite oder für größere Arbeitsbreiten als Auszieh-Bohle seitlich verlängerbar sein. Der in Fahrtrichtung F vor der Glättbohle 7 angeordnete Stampfer 8 arbeitet als Vorverdichtungselement.The paver 1 according to Fig. 1a includes a chassis 2, a drive unit 3, a forward lying in the direction of travel Gutbunker 4 and a rear auger 5. With lateral arms 6 a screed 7 is towed, which transported from the Gutbunker 4 to the rear, installed by the auger 5 built-in building material. The screed 7 is preferably a vibration screed that smoothes and compacts. At the front in the direction of travel F side of the screed 7 at least one rammer 8 is arranged, as in Fig. 1b is shown. To Fig. 1b are two rammers 8 arranged one behind the other. It is therefore a Doppelstampfer screed. A rammer 8 may also be arranged downstream of the screed 7. The screed 7 can be laterally extendable with a fixed working width or for larger working widths as an extendable screed. The arranged in the direction of travel F in front of the screed 7 ram 8 operates as a precompression element.

Die Fig. 1a und 1b zeigen somit eine Vorrichtung zum Verdichten von Straßenbaustoffen mit einer an einem Straßenfertiger 1 befestigten, quer zur Arbeitsrichtung des Fertigers 1 verlaufenden Glättbohle 7 und einem derselben vorgeordneten Stampfer 8. Der nachfolgend beschriebene Stampfer 8 kann vorzugsweise zusätzlich oder alternativ der Glättbohle 7 nachgeordnet sein.The Fig. 1a and 1b Thus, a device for compacting road materials with a attached to a paver 1, transverse to the direction of the paver 1 smoothing 7 and a same upstream rammer 8. The rammer described below 8 may preferably additionally or alternatively the screed 7 be arranged downstream.

Der Stampfer 8 weist eine für eine schlagende Auf- und Abwärtsbewegung antreibbare Stampferleiste 9 auf. Für den Antrieb der Stampferleiste 9 ist ein Antrieb 10 vorgesehen.The rammer 8 has a tamper strip 9 which can be driven for a striking upward and downward movement. For driving the tamper strip 9, a drive 10 is provided.

Wie Fig. 2 und 3 zeigen, ist das Innere der Stampferleiste 9 mit einer elektrischen Heizung in Form eines stabförmigen, in einer Ausnehmung 11 der Stampferleiste 9 klemmbaren Heizelementes 12 ausgerüstet. Die Ausnehmung 11 bildet einen umschlossenen Raum für das Heizelement 12. Das Heizelement 12 wird von einem Rundrohrheizkörper gebildet, dessen Heizwendel 20 an einem freien Ende des Rundrohrheizkörpers mindestens einmal umgelegt ist unter Ausbildung zweier benachbart zueinander angeordneter Stäbe 33, 34. Gemäß Fig. 2 liegen die beiden Stäbe 33, 34 nebeneinander. Gemäß Fig. 3 liegen die beiden Stäbe 33, 34 übereinander.As Fig. 2 and 3 show, the interior of the tamper strip 9 is equipped with an electric heater in the form of a rod-shaped, can be clamped in a recess 11 of the tamper strip 9 heating element 12. The heating element 12 is formed by a round tubular heater whose heating coil 20 is folded over at a free end of the round tubular heater at least once to form two adjacently arranged rods 33, 34th According to Fig. 2 are the two rods 33, 34 next to each other. According to Fig. 3 are the two rods 33, 34 on top of each other.

Gemäß Fig. 2 ist zum Klemmen des Heizelementes 12 eine Halteleiste 31 vorgesehen, die mittels Schrauben 32 das Heizelement 12 auf einen Boden 26 der Ausnehmung 11 drückt, damit dieses spielfrei in der Ausnehmung 11 liegt.According to Fig. 2 is for holding the heating element 12, a retaining strip 31 is provided which presses the heating element 12 by means of screws 32 on a bottom 26 of the recess 11, so that this is free of play in the recess 11.

Gemäß Fig. 3 ist zum Klemmen des Heizelementes 12 ein das Heizelement 12 in Richtung der schlagenden Auf- und Abwärtsbewegung S lagernder Federspeicher vorgesehen. Der Federspeicher bewirkt eine Klemmung durch elastische Verformung. Der Federspeicher klemmt das Heizelement 12 längs der Ausnehmung 11 derart, dass das Heizelement 12 stabilisiert bzw. spielfrei in der Ausnehmung 11 liegt. Die Wärmeausdehnung des Heizelementes 12 in Richtung eines freien Endes 13 ist gegeben.According to Fig. 3 is for clamping the heating element 12, a heating element 12 in the direction of the beating up and down movement S stored spring storage provided. The spring accumulator causes a clamping by elastic deformation. The spring accumulator clamps the heating element 12 along the recess 11 such that the heating element 12 is stabilized or free of play in the recess 11. The thermal expansion of the heating element 12 in the direction of a free end 13 is given.

Die Ausnehmung 11 kann einen runden oder kantigen Querschnitt aufweisen, sie kann von einer Kernbohrung gebildet sein oder sie kann als verschlossene Nut ausgebildet sein.The recess 11 may have a round or angular cross-section, it may be formed by a core hole or it may be formed as a closed groove.

Wie Fig. 2 und Fig. 3 zeigen, ist ein Austausch des Heizelementes 12 außerdem merklich einfacher, wenn dieses nur an der Stirnseite des Stampfers 8 über einen Anschlussblock 14 befestigt ist. Das Heizelement 12 ist über den Anschlussblock 14 elektrisch angeschlossen an eine Stromquelle, wofür ein Anschlusskabel 19 vorgesehen ist. Der Anschlussblock 14 ist an der Stampferleiste 9 befestigt.As Fig. 2 and Fig. 3 In addition, replacement of the heating element 12 is noticeably easier if it is fastened only on the front side of the rammer 8 via a connection block 14. The heating element 12 is electrically connected via the terminal block 14 to a power source, for which a connection cable 19 is provided. The terminal block 14 is attached to the tamper strip 9.

Gemäß dem in Fig. 3 gezeigten zweiten Ausführungsbeispiel ist das Heizelement 12 vorzugsweise als gewellter, geknickter oder zickzackförmiger Heizstab ausgebildet, dessen elastische Formänderung den Federspeicher bildet. Das Heizelement 12 sitzt elastisch vorgespannt in der Ausnehmung 11 der Stampferleiste 9. Die Ausnehmung 11, die sich längs der Stampferleiste 9 erstreckt, besitzt somit Abmessungen, insbesondere in der Höhe und in der Breite, die die elastische Verformung des Heizelementes 12 und damit die Vorspannung bestimmt (vgl. Fig. 6). Die elastische Formänderung des Heizelementes 12 wird ausgenutzt, wozu die Stärke der Wellung oder der Zickzackform des Heizstabes in Bezug auf die Ausnehmung 11 gewählt wird. Fig. 6 zeigt beispielsweise die von der menschlichen Muskelkraft herrührende Energie (beim Einsetzen des Heizelementes 12) zum Aufbau des statisch wirkenden Federspeichers unter Ausnutzung der elastischen Formänderung. Das eigenständige Klemmen von Heizstäben als Heizelemente 12 ist unabhängig von der Rohrform.According to the in Fig. 3 shown second embodiment, the heating element 12 is preferably formed as a corrugated, kinked or zigzag-shaped heating element whose elastic shape change forms the spring accumulator. The heating element 12 is seated elastically biased in the recess 11 of the tamper strip 9. The recess 11 extending along the tamper strip 9 thus has dimensions, in particular in height and in width, the elastic deformation of the heating element 12 and thus the bias determined (cf. Fig. 6 ). The elastic deformation of the heating element 12 is exploited, to which the strength of the corrugation or the zigzag shape of the heating element is selected with respect to the recess 11. Fig. 6 shows, for example, the originating from human muscle energy (when inserting the heating element 12) to build the static acting spring accumulator taking advantage of the elastic deformation. The independent terminals of heating elements as heating elements 12 is independent of the tube shape.

Die Anzahl Wellen der Knickstellen 15, 16, 17, 18 kann variieren. Mindestens eine Knickstelle ist jedoch erforderlich. Die Achse der Knickung kann variieren. Gemäß Fig. 3 befinden sich die Knickstellen in einer Ebene. Dies ist aber nicht zwingend erforderlich.The number of waves of kinks 15, 16, 17, 18 may vary. At least one kink is required. The axis of the buckling can vary. According to Fig. 3 the kinks are in one plane. But this is not mandatory.

Fig. 6 zeigt das Einsetzen eines Heizelementes 12 gemäß Fig. 3 in die Ausnehmung 11 der Stampferleiste 9. Die federnde Klemmwirkung kann schließlich auch von dem eigentlichen Heizelement 12 getrennt sein. Dabei wird eine zusätzliche, nicht beheizte Beilage in Wellen- oder Knickform genutzt, um das Heizelement 12 zu klemmen, wie in Fig. 7, 8 dargestellt ist. Fig. 6 shows the insertion of a heating element 12 according to Fig. 3 in the recess 11 of the tamper strip 9. The resilient clamping action can finally from the actual heating element 12 to be separated. In this case, an additional, unheated side dish in wave or kink shape is used to clamp the heating element 12, as in Fig. 7, 8 is shown.

Wie Fig. 3 zeigt, ist das Heizelement 12 als Rundrohrheizstab ausgebildet. Dieser Rundrohrheizstab weist nur eine Heizwendel 20 auf, deren freies Ende 13 umgelegt und zurückgeführt ist. Anfang 21 und Ende 22 der einen Heizwendel 20 sind an den einen Anschlussblock 14 angeschlossen und befestigt. Durch die Verwendung eines Rundrohrheizstabes mit umgelegter Heizwendel 20 ist die Ausnehmung 11 klein ausbildbar. Die dadurch verminderte Konvektion liefert ein großes Einsparpotential an Verlustwärme zugunsten von Wärmeleitung und Wärmestrahlung. Die Heizwendel 20 überträgt Wärme auf die Stampferleiste 9, wobei der Kontakt zur Stampferleiste 9 nicht mehr vorrangig ist wie bei Flachrohrheizkörpern. Die umgelegte Heizwendel 20 bildet ein Heizpaket mit zwei über- oder nebeneinander angeordneten Stäben 33, 34 der Heizwendel 20 eines Rundrohrheizkörpers, die in einem gemeinsamen Anschlussblock 14 mit einer elektrischen Zuleitung 19 verbunden sind.As Fig. 3 shows, the heating element 12 is formed as Rundrohrheizstab. This Rundrohrheizstab has only one heating coil 20, the free end 13 is folded and returned. Beginning 21 and end 22 of a heating coil 20 are connected to the one terminal block 14 and fastened. By using a Rundrohrheizstabes with folded heating coil 20, the recess 11 can be formed small. The resulting reduced convection provides a great savings potential for heat loss in favor of heat conduction and heat radiation. The heating coil 20 transfers heat to the tamper strip 9, wherein the contact with the tamper strip 9 is no longer a priority as in Flachrohrheizkörpern. The folded heating coil 20 forms a heating package with two superimposed or juxtaposed rods 33, 34 of the heating coil 20 of a round tubular heater, which are connected in a common terminal block 14 with an electrical lead 19.

Die gemäß Fig. 3 vorgesehenen vier Knickstellen 15, 16, 17, 18 sind so gewählt, dass das Heizelement 12 genug Federspannung aufbaut, um sich während des Betriebs des Stampfers 8 ausreichend in der Stampferleiste 9 festzuklemmen. Das Heizelement 12 als Rundrohrheizkörper hat eine gute Biegeeigenschaft.The according to Fig. 3 provided four kinks 15, 16, 17, 18 are chosen so that the heating element 12 builds enough spring tension to clamp during the operation of the rammer 8 sufficiently in the tamper strip 9. The heating element 12 as a round tubular heater has a good bending property.

Gemäß Fig. 3 umfasst die Stampferleiste 9 vorzugsweise eine Tragleiste 23 und eine Schlagleiste 24. Die Stampferleiste 9 ist damit horizontal geteilt. Zur Ausbildung der Ausnehmung 11 in einem umschlossenen Raum der Stampferleiste 9 ist vorzugsweise in der Tragleiste 23 eine Nut 25, in der sich das Heizelement 12 befindet. Die Nut 25 ist über eine Kopffläche 26 der Schlagleiste 24 geschlossen zur Ausbildung der Ausnehmung 11. Nach einem Verschleißen der Schlagleiste 24 kann die Tragleiste 23 am Fertiger 1 verbleiben und weiter verwendet werden. Die Nut 25 kann somit in einem nicht verschleißenden Teil angebracht werden.According to Fig. 3 the tamper strip 9 preferably comprises a support bar 23 and a beater bar 24. The tamper bar 9 is thus divided horizontally. To form the recess 11 in an enclosed space of the tamper strip 9 is preferably in the support bar 23 has a groove 25 in which the heating element 12 is located. The groove 25 is closed by a top surface 26 of the beater bar 24 to form the recess 11. After a wear of the beater bar 24, the support bar 23 remain on the paver 1 and continue to be used. The groove 25 can thus be mounted in a non-wearing part.

Die Schlagleiste 24 kann aus mehreren Schlagleistensegmenten bestehen. Die Schlagleiste 24 kann beispielsweise mindestens zwei hintereinander angeordnete Schlagleistensegmente aufweisen. Die Schlagleistensegmente können durch ein Deckblech überbrückt sein. Das Deckblech kann dann die Kopffläche 26 zur Begrenzung der Ausnehmung 11 bilden.The blow bar 24 may consist of several blow bar segments. The blow bar 24, for example, have at least two consecutively arranged blow bar segments. The blow bar segments can be bridged by a cover plate. The cover plate can then form the top surface 26 for limiting the recess 11.

Die Schlagleiste 24 ist ferner vorzugsweise als dünnwandiges Profil ausgebildet. Die Tragleiste 23 ist als Tragkörper an die Einsatzbedingungen anpassbar. Beispielsweise kann die Tragleiste 23 kopfseitig einen vorstehenden Sockel 30 zur Bauteilversteifung aufweisen. Die Befestigung des Stampfers 8 an dem Antrieb 10 erfolgt beispielsweise über Arme 28, 29 an der Stampferleiste 9.The blow bar 24 is also preferably formed as a thin-walled profile. The support bar 23 is adaptable as a supporting body to the conditions of use. For example, the support bar 23 on the head side have a protruding base 30 for component stiffening. The attachment of the rammer 8 to the drive 10, for example, via arms 28, 29 on the tamper strip. 9

Gemäß Fig. 2 ist die Ausnehmung 11 in einer Stampferleiste 9 ausgebildet, bei der die Tragleiste 23 einstückig ausgebildet ist mit der Schlagleiste 24. Die Ausnehmung 11 kann dann beispielsweise von einer Kernbohrung gebildet werden.According to Fig. 2 the recess 11 is formed in a tamper strip 9, wherein the support bar 23 is integrally formed with the beater bar 24. The recess 11 can then be formed for example by a core hole.

Fig. 4 und Fig. 5 zeigen die Stampferleiste 9 gemäß Fig. 3 mit zwei übereinander angeordneten Stäben der Heizwendel 20 eines Rundrohrheizkörpers. Die Ausnehmung 11 wird stirnseitig der Stampferleiste 9 durch den Anschlussblock 14 verschlossen. Wie Fig. 6 zeigt, ist vor dem Einbau das Heizelement 12 stärker geknickt als im montierten Zustand. Während der Montage, beispielsweise durch Anwendung menschlicher Muskelkraft, wird das Heizelement 12 seitlich in die Nut 25 zwischen Tragleiste 23 und Schlagleiste 24 geschoben. Währenddessen verformt sich das Heizelement 12 elastisch und gegebenenfalls anteilig plastisch soweit in eine vorgespannte Form, dass es die Nut 25 ausfüllt. Der Anteil der elastischen Verformung bewirkt die Klemmung. Die Länge der Ausnehmung 11 ist derart bemessen, dass sich das Heizelement 12 zum freien Ende durch gleitende Bewegung ausdehnen kann. Wie Fig. 5 zeigt, ist das Heizelement 12 im geschlossenen System der Ausnehmung 11 vollkommen von der Stampferleiste umhüllt. Kein direkter Kontakt zwischen Heizelement 12 als Rundrohrheizkörper und Schlagleiste 24 ist erforderlich. Die Oberflächentemperatur des Rundrohrheizkörpers erhöht sich im Vergleich zu einem Flachrohrheizkörper mit Kontakt. Der Rundrohrheizkörper ist für diese höhere Temperatur geeignet. Der Anteil des Wärmestroms aus der verringerten Kontaktwärmeübertragung des Rundrohrheizkörpers verteilt sich folglich insbesondere auf die Wärmestrahlung und die Konvektion als Wärmeübertragungsarten. 4 and FIG. 5 show the tamper strip 9 according to Fig. 3 with two superimposed rods of the heating coil 20 of a round tubular heater. The recess 11 is closed at the front side of the tamper strip 9 by the connection block 14. As Fig. 6 shows, prior to installation, the heating element 12 is more kinked than in the mounted state. During assembly, for example by application of human muscle power, the heating element 12 is pushed laterally into the groove 25 between the support bar 23 and beater bar 24. Meanwhile, the heating element 12 deforms elastically and possibly proportionally plastically far enough in a prestressed form that it fills the groove 25. The proportion of elastic deformation causes the clamping. The length of the recess 11 is dimensioned such that the heating element 12 can expand to the free end by sliding movement. As Fig. 5 shows, the heating element 12 is completely enclosed in the closed system of the recess 11 of the tamper strip. No direct contact between heating element 12 as a round tubular heater and blow bar 24 is required. The surface temperature of the round tubular heater increases with respect to a Flachrohrheizkörper with contact. The round tube heater is suitable for this higher temperature. The proportion of the heat flow from the reduced contact heat transfer of the round tubular heater is thus distributed in particular to the heat radiation and the convection as heat transfer types.

Gemäß Fig. 7 und Fig. 8 ist als Federspeicher eine gewellte oder geknickte Beilage 27 vorgesehen, deren elastische Formänderung den Federspeicher bildet. Die federnde Klemmwirkung ist hier von dem eigentlichen Heizelement 12 getrennt. Die Beilage 27 ist ein zusätzliches, vorzugsweise nicht beheiztes Element in Wellen- oder Knickform, das das Heizelement 12 klemmt.According to FIGS. 7 and 8 is provided as a spring storage a corrugated or kinked insert 27 whose elastic shape change forms the spring accumulator. The resilient clamping action is here separated from the actual heating element 12. The supplement 27 is an additional, preferably unheated element in wave or kink shape, which clamps the heating element 12.

Claims (18)

  1. A device for compacting road paving materials, comprising a screed (7) which is fastened to a road finisher (1) and extends transversely to the working direction of the finisher (1), and a tamper (8) which is arranged upstream and/or downstream of said screed and which has a tamper strip (9) which can be driven to perform a striking upward and downward movement (S), said tamper strip being equipped in its interior with an electrical heater in the form of a bar-shaped heating element (12) which can be clamped in a cavity (11) of the tamper strip (9), characterized in that the heating element (12) is a round-tube heating body whose heating filament (20) is folded over at least once at a free end of the round-tube heating body to form two bars arranged adjacently to one another which are connected in a common connecting block (14) to an electrical supply line (19).
  2. The device as claimed in claim 1, characterized in that the heating filament (20) is designed as a single rod.
  3. The device as claimed in claim 1 or 2, characterized in that the heating filament (20) forms two rods arranged above or next to one another.
  4. The device as claimed in one of claims 1 to 3, characterized in that the connecting block (14) closes the cavity (11) to form a closed space.
  5. The device as claimed in one of claims 1 to 4, characterized in that the connecting block (14) is arranged at an end face of the tamper strip (9).
  6. The device as claimed in one of claims 1 to 5, characterized in that the tamper strip (9) has a carrying strip (23) and an impact strip (24) and the cavity (11) is formed in the carrying strip (23).
  7. The device as claimed in claim 6, characterized in that the carrying strip (23) has a groove (25) which is closed via a top surface (26) of the impact strip (24) to form the cavity (11).
  8. The device as claimed in claim 6 or 7, characterized in that the carrying strip (23) has a pedestal (30) projecting on the top side for component reinforcement.
  9. The device as claimed in one of claims 6 to 8, characterized in that the impact strip (24) has at least two impact strip segments arranged one behind the other.
  10. The device as claimed in claim 9, characterized in that the impact strip segments are bridged by a cover plate.
  11. The device as claimed in claim 10, characterized in that the cover plate forms the top surface (26) for delimiting the cavity (11).
  12. The device as claimed in one of claims 6 to 11, characterized in that the impact strip (24) is designed as a thin-walled profile.
  13. The device as claimed in one of claims 1 to 12, characterized in that, in order to clamp the heating element (12), a spring accumulator which bears the heating element (12) in the direction of the striking upward and downward movement is provided.
  14. The device as claimed in claim 13, characterized in that the spring accumulator is formed by elastic deformation.
  15. The device as claimed in claim 13 or 14, characterized in that the spring accumulator clamps the heating element (12) along the cavity (11) in such a way that it lies in a play-free manner in the cavity (11).
  16. The device as claimed in one of claims 13 to 15, characterized in that the heating element (12) is designed as a corrugated or zigzag-shaped heating bar whose elastic change in shape forms the spring accumulator.
  17. The device as claimed in one of claims 13 to 15, characterized in that the spring accumulator is designed as a corrugated or zigzag-shaped shim (27) whose elastic change in shape forms the spring accumulator.
  18. The device as claimed in one of claims 1 to 12, characterized in that, in order to clamp the heating element (12), a holding strip (31) which bears the heating element (12) in the direction of the striking upward and downward movement is provided.
EP09706156.8A 2008-02-02 2009-01-06 Device for compacting road paving materials Active EP2238297B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008007307A DE102008007307A1 (en) 2008-02-02 2008-02-02 Apparatus for compacting road building materials
PCT/EP2009/000026 WO2009095146A1 (en) 2008-02-02 2009-01-06 Device for compacting road paving materials

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EP2238297A1 EP2238297A1 (en) 2010-10-13
EP2238297B1 true EP2238297B1 (en) 2013-07-31

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US (1) US8113738B2 (en)
EP (1) EP2238297B1 (en)
CN (1) CN101960072B (en)
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WO (1) WO2009095146A1 (en)

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CN101960072B (en) 2013-02-06
DE102008007307A1 (en) 2009-08-06
US8113738B2 (en) 2012-02-14
EP2238297A1 (en) 2010-10-13
WO2009095146A1 (en) 2009-08-06
US20110002738A1 (en) 2011-01-06
CN101960072A (en) 2011-01-26

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