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EP0241895B1 - Device for cleaning, melting and widening joints or cracks in asphalt pavements - Google Patents

Device for cleaning, melting and widening joints or cracks in asphalt pavements Download PDF

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Publication number
EP0241895B1
EP0241895B1 EP87105451A EP87105451A EP0241895B1 EP 0241895 B1 EP0241895 B1 EP 0241895B1 EP 87105451 A EP87105451 A EP 87105451A EP 87105451 A EP87105451 A EP 87105451A EP 0241895 B1 EP0241895 B1 EP 0241895B1
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EP
European Patent Office
Prior art keywords
housing
outlet
road surface
pipe
gas
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
EP87105451A
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German (de)
French (fr)
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EP0241895A2 (en
EP0241895A3 (en
Inventor
Richard Rupprecht
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Individual
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Individual
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Filing date
Publication date
Priority claimed from DE19863612685 external-priority patent/DE3612685C1/en
Application filed by Individual filed Critical Individual
Priority to AT87105451T priority Critical patent/ATE56494T1/en
Publication of EP0241895A2 publication Critical patent/EP0241895A2/en
Publication of EP0241895A3 publication Critical patent/EP0241895A3/en
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Publication of EP0241895B1 publication Critical patent/EP0241895B1/en
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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
    • E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
    • E01C23/09—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for forming cuts, grooves, or recesses, e.g. for making joints or channels for markings, for cutting-out sections to be removed; for cleaning, treating, or filling cuts, grooves, recesses, or fissures; for trimming paving edges
    • E01C23/0906—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for forming cuts, grooves, or recesses, e.g. for making joints or channels for markings, for cutting-out sections to be removed; for cleaning, treating, or filling cuts, grooves, recesses, or fissures; for trimming paving edges for forming, opening-out, cleaning, drying or heating cuts, grooves, recesses or, excluding forming, cracks, e.g. cleaning by sand-blasting or air-jet ; for trimming paving edges
    • E01C23/0953—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for forming cuts, grooves, or recesses, e.g. for making joints or channels for markings, for cutting-out sections to be removed; for cleaning, treating, or filling cuts, grooves, recesses, or fissures; for trimming paving edges for forming, opening-out, cleaning, drying or heating cuts, grooves, recesses or, excluding forming, cracks, e.g. cleaning by sand-blasting or air-jet ; for trimming paving edges by thermal effect, e.g. cutting by melting, cleaning drying or heating with hot jets

Definitions

  • the invention relates to a device for cleaning, melting and widening joints or cracks to be filled with potting compound in road surfaces with a jacket housing mounted on a trolley, which has a tapered outlet opening on the side facing the road surface and a free inlet opening on the side facing away from the road surface.
  • a gas burner with a gas supply line in front of which a gas burner with a gas supply line is arranged and with a tube for compressed air which is guided into the casing and has a rectilinear end with an outlet opening, the hot air jet which flows out of the tapered outlet opening during operation can be directed at an acute angle onto the joint to be repaired .
  • joints cut or milled into a road surface are filled with potting compound.
  • cracks that have arisen due to weather influences, stresses or subsidence must be grouted with permanently elastic potting compound in order to protect the road surface from further damage.
  • the joints or cracks must be free of loose foreign bodies, such as stones, dirt or non-sticking asphalt parts, which are otherwise enclosed by the grout.
  • the filling points must be dry, should not have any sharp edges and preferably have an elevated temperature; Cracks must therefore be widened and rounded so that the required firm connection to the sealing compound is achieved. Otherwise, the potting compound can come out of the crack after just a short use of the road.
  • a device with the features specified in the preamble of claim 1 is known from DE-U 71 39 783.
  • At least one gas burner which can be ignited by hand, is arranged in front of the free air-side opening of the casing housing tapering on the street-ceiling side. Between the burners, the compressed air is led deep into the casing through a straight pipe. Due to the compressed air flowing out of the straight tube, fresh air is sucked in sufficiently at the free opening of the casing and fed to the burners, but here an intimate mixing of the two working gases, compressed air and gas-fresh air mixture, is required so that the compressed air supplied is heated to a sufficient extent; for this reason, the straight compressed air pipe also ends at a corresponding distance in front of the tapered outlet opening of the jacket housing.
  • the invention has for its object to develop a device of the type mentioned in such a way that the efficiency is increased in particular depending on the fuel consumption.
  • the tube is designed as a heat exchanger which passes through the jacket housing with spiral turns in the longitudinal direction, and with its outlet opening is approximately brought up to the tapered outlet opening of the jacket housing, so that separate hot air outlets for the compressed air and the gas-fresh air mixture are provided.
  • the outflowing thin compressed air hot jet also sucks a sufficient amount of the gas-fresh air mixture out of the casing, so it is surrounded all around by a jet of the gas-fresh air mixture with a lower flow rate, which ensures that the two joint edges melt away, so that no primer is required before grouting with potting compound, and nevertheless reliable adhesion is achieved.
  • the windings of the spiral tube expand in the longitudinal direction of the jacket housing. This results in a more intensive flow around the spiral tube with the flames of the gas burner.
  • a protective grille attached in front of the tapered outlet opening of the casing serves as a flame arrester and protects the operator.
  • the device shown in FIGS. 1 and 2 for repairing asphalt road surfaces has a single-axle carriage 1 with two wheels, the is expediently manufactured as a welded pipe construction.
  • a casing 2 On the carriage 1, a casing 2 is fixed.
  • the casing 2 consists of a cylindrical tubular part 3, which is open to the atmosphere at its end 5 facing away from the road surface S and a conical funnel 4 with a tapered outlet opening 6 is welded to the end of the road surface.
  • a protective grille (not shown) can also be attached in front of the outlet opening 6 of the conical funnel 4.
  • the axis of the cylindrical part 3 of the casing 2 is inclined at an acute angle to the road surface in the operating position of the device and the conical funnel 4 reduces this inclination angle with its axis according to FIG.
  • a gas burner 7 (not shown in detail) is arranged in front of the inlet opening 5 of the casing 2, the flame jet of which is directed into the interior of the casing 2.
  • a gaseous fuel usually propane gas, is supplied to the gas burner 7 via a fixed feed line 8 attached to the carriage 1; on the fixed feed line 8, a flexible feed line 9 is connected, which leads to the fuel reservoir, not shown.
  • the heat exchanger In the interior of the casing 2, a heat exchanger through which compressed air flows is arranged in front of the flame jet of the gas burner 7.
  • the heat exchanger consists of a tube spiral 10, the turns of the same diameter of which are located in the tubular part 3 of the jacket housing 2 and extend in the longitudinal direction thereof.
  • the open end 11 of the spiral tube 10 is guided in a straight line through the conical funnel 4 of the casing 2, in such a way that its outlet opening 12 comes close to the tapered outlet opening 6 of the conical funnel 4 of the casing 2.
  • An additional outlet nozzle (not shown) is expediently arranged at the outlet opening 12 from the pipe spiral 10.
  • the outlet opening 12 for the compressed air is thus still somewhat surrounded in the conical funnel 4 by an approximately ring-shaped outlet opening for the gas-fresh air mixture brought about on the burner side, so that separate hot air outlets for the compressed air conducted through the spiral tube 10 and that from the Shell housing 2 sucked gas-fresh air mixture are present.
  • the compressed air is fed to the spiral tube 10 via a fixed supply line 13 attached to the carriage 1, which is connected to a flexible supply line 14 leading to the compressor (not shown).
  • the fixed supply line 13 for the compressed air can also be designed as an operating handle for the device, from which the upper end of the spiral tube 10 is led out at a suitable point.
  • the supply lines 8 and 13 for fuel or compressed air have shut-off valves 15 and 16 at an easily accessible location.
  • the fuel storage container and compressor are located on a truck traveling with them.
  • shut-off valves 15 and 16 are opened and the gas burner 7 is ignited by hand.
  • Compressed air flows through the tube spiral 10 and a strong hot air jet 17 results at its outlet opening 12, the cross section of which corresponds approximately to the tube inner diameter or that of the outlet nozzle from the tube spiral 10.
  • the hot air jet 17 flowing out of the rectilinear end 11 of the spiral tube 10 develops a strong suction effect at the outlet opening 6 from the conical funnel 4, so that the gas-fresh air mixture surrounding it is entrained and fresh air flows in at the open inlet opening 5 to an increased extent, whereby a distinctive flame forms on the gas burner 7, which envelops the turns of the spiral tube 10.
  • the relatively thin hot air jet 17 of the compressed air emerging from the tapered outlet opening 6 at high speed is thus surrounded by a jet 18 of lower flow speed, which consists of the burning working gas and the fresh air drawn in.
  • the central compressed air hot jet 17 of high flow speed is directed by the operator at an acute angle directly into the joint F to be repaired in the road surface S, so penetrates deep into it with an oblique inclination and thus blows it free of all impurities such as stones and dirt , Sand or the like, and due to its high temperature also ensures a melting of the bitumen present in the asphalt surface within the joint F, while the gas-fresh air hot jet 18 surrounding it at a lower flow rate, for a wide melting of the bitumen at the ensures both joint edges. Joints pretreated in this way can be reliably filled with permanently elastic casting compound in an immediately or possibly later subsequent operation.
  • the temperatures and the outflow speeds of the two working gases, hot air jet 17 from compressed air and the jet 18 surrounding them from the gaseous fuel together with the fresh air drawn in can be regulated within certain limits or optimally coordinated with one another by means of the shut-off valves 15 and 16.
  • the device In the event of a brief shutdown of the device, it is sufficient to block the compressed air shut-off valve 16 and to reduce the fuel throughput at the shut-off valve 15 without letting the burner flame go out; the device can then be placed on the road surface S with its operating handle and is still ready for use.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Paving Machines (AREA)
  • Road Repair (AREA)
  • Road Paving Structures (AREA)
  • Working-Up Tar And Pitch (AREA)

Abstract

1. Fixture to clean melt and distribute sealing compound for filling road surface joints and cracks, using a vehicle fitted with a housing, which on the side facing the road surface has a tapered outlet and on the side away from the road surface has an unobstructed inlet, which has a gas burner with a gas supply pipe in front of it, and leading into the housing is a compressed sir pipe with a straightlined end and outlet, during operation, the outflowing hot air jet from the tapered outlet is able to be directed at an acute angle to the joint that needs repairing, characterised by the fact that pipe (10, 11) is designed as a heat exchanger which traverses the housing (2) in spiral form, and with its outlet (12) is routed to about the same level as the tapered outlet (6) of the housing (2), to provide separate hot air outlets for the compressed air and the gas air mixture.

Description

Die Erfindung betrifft eine Vorrichtung zum Reinigen, Schmelzen und Verbreitern von mit Vergußmasse auszufüllenden Fugen oder Rissen in Straßendecken mit einem auf einem Wagen angebrachten Mantelgehäuse, das auf der der Straßendecke zugewandten Seite eine verjüngte Austrittsöffnung und auf der der Straßendecke abgewandten Seite eine freie Eintrittsöffnung aufweist, vor der ein Gasbrenner mit einer Gaszuführleitung angeordnet ist und mit einem in das Mantelgehäuse geführten Rohr für Druckluft, das ein geradlinig verlaufendes Ende mit einer Austrittsöffnung aufweist, wobei der beim Betrieb aus der verjüngten Austrittsöffnung strömende Heißluftstrahl unter einem spitzen Winkel auf die auszubessernde Fuge richtbar ist.The invention relates to a device for cleaning, melting and widening joints or cracks to be filled with potting compound in road surfaces with a jacket housing mounted on a trolley, which has a tapered outlet opening on the side facing the road surface and a free inlet opening on the side facing away from the road surface. in front of which a gas burner with a gas supply line is arranged and with a tube for compressed air which is guided into the casing and has a rectilinear end with an outlet opening, the hot air jet which flows out of the tapered outlet opening during operation can be directed at an acute angle onto the joint to be repaired .

Im Straßenbau werden in eine Straßendecke eingeschnittene oder eingefräste Fugen mit Vergußmasse ausgefüllt. Weiterhin müssen Risse, die aufgrund von Witterungseinflüssen, Spannungen oder Setzungen entstanden sind, mit dauerelastischer Vergußmasse ausgefugt werden, um die Straßendecke vor weiterer Schädigung zu bewahren. Zum einwandfreien Vergießen müssen die Fugen oder Risse frei von losen Fremdkörpern, wie Steine, Schmutz oder nicht haftende Asphaltteile, sein, die sonst von der Vergußmasse eingeschlossen werden. Die Einfüllstellen müssen trocken sein, sollen keine scharfen Kanten und vorzugsweise eine erhöhte Temperatur aufweisen; Risse müssen also verbreitert und abgerundet werden, damit es zu der erforderlichen festen Verbindung mit der Vergußmasse kommt. Andernfalls kann sich die Vergußmasse bereits nach kurzer Benutzung der Straße wieder aus dem Riß lösen.In road construction, joints cut or milled into a road surface are filled with potting compound. Furthermore, cracks that have arisen due to weather influences, stresses or subsidence must be grouted with permanently elastic potting compound in order to protect the road surface from further damage. For proper grouting, the joints or cracks must be free of loose foreign bodies, such as stones, dirt or non-sticking asphalt parts, which are otherwise enclosed by the grout. The filling points must be dry, should not have any sharp edges and preferably have an elevated temperature; Cracks must therefore be widened and rounded so that the required firm connection to the sealing compound is achieved. Otherwise, the potting compound can come out of the crack after just a short use of the road.

Zum Reinigen, Schmelzen und Verbreitern von Fugen oder Rissen in Asphaltstraßendecken sind u.a. handbediente Geräte bekannt, die einen Heißluftstrahl in die auszubessernde Fuge leiten:For cleaning, melting and widening joints or cracks in asphalt road surfaces, Hand-operated devices known that direct a jet of hot air into the joint to be repaired:

Ein Gerät mit den im Oberbegriff des Anspruchs 1 angegebenen Merkmalen ist durch das DE-U 71 39 783 bekannt. Vor der freien luftseitigen Öffnung des sich straßendeckenseitig verjüngenden Mantelgehäuses ist wenigstens ein Gasbrenner angeordnet, der von Hand gezündet werden kann. Zwischen den Brennern wird die Druckluft durch ein geradlinig verlaufendes Rohr tief in das Mantelgehäuse geführt. Aufgrund der aus dem geraden Rohr ausströmenden Druckluft wird zwar an der freien Öffnung des Mantelgehäuses in ausreichendem Maß Frischluft angesaugt und den Brennern zugeführt, jedoch ist hier eine innige Vermischung der beiden Arbeitsgase, Druckluft und Gas-Frischluft-Gemisch, erforderlich, damit die zugeführte Druckluft in ausreichendem Maß erhitzt wird; aus diesem Grund endet das gerade Druckluftrohr auch in entsprechendem Abstand vor der verjüngten Austrittsöffnung des Mantelgehäuses.A device with the features specified in the preamble of claim 1 is known from DE-U 71 39 783. At least one gas burner, which can be ignited by hand, is arranged in front of the free air-side opening of the casing housing tapering on the street-ceiling side. Between the burners, the compressed air is led deep into the casing through a straight pipe. Due to the compressed air flowing out of the straight tube, fresh air is sucked in sufficiently at the free opening of the casing and fed to the burners, but here an intimate mixing of the two working gases, compressed air and gas-fresh air mixture, is required so that the compressed air supplied is heated to a sufficient extent; for this reason, the straight compressed air pipe also ends at a corresponding distance in front of the tapered outlet opening of the jacket housing.

Demgegenüber liegt der Erfindung die Aufgabe zugrunde, eine Vorrichtung der eingangs genannten Art derart weiterzuentwickeln, daß der Wirkungsgrad insbesondere in Abhängigkeit vom Brennstoffverbrauch erhöht wird.In contrast, the invention has for its object to develop a device of the type mentioned in such a way that the efficiency is increased in particular depending on the fuel consumption.

Diese Aufgabe wird erfindungsgemäß mit den Merkmalen gelöst, daß das Rohr als Wärmetauscher ausgebildet ist, der das Mantelgehäuse mit spiralförmigen Windungen in Längsrichtung durchsetzt, und mit seiner Austrittsöffnung etwa bis an die verjüngte Austrittsöffnung des Mantelgehäuses herangeführt ist, so daß getrennte Heißluftausgänge für die Druckluft und das Gas-Frischluft-Gemisch vorgesehen sind.This object is achieved with the features that the tube is designed as a heat exchanger which passes through the jacket housing with spiral turns in the longitudinal direction, and with its outlet opening is approximately brought up to the tapered outlet opening of the jacket housing, so that separate hot air outlets for the compressed air and the gas-fresh air mixture are provided.

Bei der erfindungsgemäßen Ausströmung der beiden Arbeitsgase aus dem Gerät wird nur ein vglw. dünner Heißstrahl mit der hohen Strömungsgeschwindigkeit benötigt, wie er sich beim Arbeiten mit ausströmender Druckluft ergibt. Dieser Druckluft-Heißstrahl wird geradlinig durch die verjüngte Austrittsöffnung des Mantelgehäuses ausgeblasen und direkt auf das Innere der auszubessernden Fuge gerichtet, um diese von den darin befindlichen Fremdkörpern zu reinigen. Aufgrund des im Mantelgehäuse befindlichen, als Rohrspirale ausgebildeten, ausreichend dimensionierten und von den Flammen des Gasbrenners umhüllten Wärmetauschers weist der ausströmende Druckluft-Heißstrahl aber auch eine ausreichend hohe Temperatur auf, um das Bitumen in der Asphaltstraßendecke zum Schmelzen zu bringen, so daß auch engste Risse zuverlässig verbreitert werden. Dabei saugt der ausströmende dünne Druckluft-Heißstrahl zugleich eine ausreichende Menge des Gas-Frischluft-Gemischs aus dem Mantelgehäuse an, ist also ringsum von einem Strahl des Gas-Frischluft-Gemischs geringerer Strömungsgeschwindigkeit umgeben, der für ein breites Abschmelzen der beiden Fugenränder sorgt, so daß vor dem Verfugen mit Vergußmasse kein Voranstrich erforderlich ist und trotzdem eine zuverlässige Haftung derselben erzielt wird.When the two working gases flow out of the device according to the invention, only one cf. thin hot jet with the high flow rate required, as it results when working with compressed air flowing out. This compressed air hot jet is blown out in a straight line through the tapered outlet opening of the casing and directed directly at the interior of the joint to be repaired in order to clean it of the foreign bodies contained therein. However, due to the adequately dimensioned heat exchanger in the casing housing, which is designed as a pipe spiral, and is surrounded by the flames of the gas burner, the outflowing compressed air hot jet also has a sufficiently high temperature to melt the bitumen in the asphalt road surface, so that even the tightest cracks be reliably broadened. The outflowing thin compressed air hot jet also sucks a sufficient amount of the gas-fresh air mixture out of the casing, so it is surrounded all around by a jet of the gas-fresh air mixture with a lower flow rate, which ensures that the two joint edges melt away, so that no primer is required before grouting with potting compound, and nevertheless reliable adhesion is achieved.

Eine direkte Vermischung des dünnen Druckluft-Heißstrahls mit dem ihn umhüllenden angesaugten Gas-Frischluft-Gemisch ist bei der Erfindung in weiten Grenzen vermieden. Bei der erfindungsgemäßen Ausströmung der beiden Arbeitsgase aus dem Mantelgehäuse konnte deshalb anhand von Versuchen ein gegenüber dem eingangs näher erläuterten Gerät ein überraschend niedrigen Verbrauch an Brennstoff festgestellt werden.A direct mixing of the thin compressed air hot jet with the sucked-in gas-fresh air mixture enveloping it is largely avoided in the invention. When the two working gases flow out of the jacket housing according to the invention, a surprisingly low consumption of fuel was therefore found on the basis of tests compared to the device explained in more detail at the beginning.

In vorteilhafter Weiterbildung der Erfindung erweitern sich die Windungen des Spiralrohrs in Längsrichtung des Mantelgehäuses konsich; hierdurch ergibt sich eine intensivere Umströmung des Spiralrohrs mit den Flammen des Gasbrenners. Ein vor der verjüngten Austrittsöffnung des Mantelgehäuses angebrachtes Schutzgitter dient als Flammsperre und schützt die Bedienungsperson.In an advantageous development of the invention, the windings of the spiral tube expand in the longitudinal direction of the jacket housing. this results in a more intensive flow around the spiral tube with the flames of the gas burner. A protective grille attached in front of the tapered outlet opening of the casing serves as a flame arrester and protects the operator.

Ein Ausführungsbeispiel der Erfindung wird nachstehend unter Bezugnahme auf dei Zeichnung näher erläutert. Im einzelnen zeigen:

  • Fig.1 eine Vorrichtung nach der Erfindung in einer Vorderansicht und
  • Fia.2 dieselbe Vorrichtung längs der Linie A-B in Fig.1 geschnitten.
An embodiment of the invention is explained below with reference to the drawing. In detail show:
  • 1 shows a device according to the invention in a front view and
  • Fig. 2 cut the same device along the line AB in Fig.1.

Die in den Fig.1 und 2 dargestellte Vorrichtung zum Ausbessern von Asphaltstraßendecken weist einen einachsigen Wagen 1 mit zwei Rädern auf, der zweckmäßig als geschweißte Rohrkonstruktion hergestellt ist. Auf dem Wagen 1 ist ein Mantelgehäuse 2 fest angebracht. Das Mantelgehäuse 2 besteht aus einem zylindrischen rohrförmigen Teil 3, das an seinem der Straßendecke S abgewandten Ende 5 zur Atmosphäre hin offen ist und an dessen stra- ßendeckenseitigem Ende ein konischer Trichter 4 mit einer verjüngten Austrittsöffnung 6 angeschweißt ist. Vor der Austrittsöffnung 6 des konischen Trichters 4 kann noch ein Schutzgitter angebracht sein (nicht dargestellt). Die Achse des zylindrischen Teils 3 des Mantelgehäuses 2 ist in der Betriebsstellung des Geräts mit spitzem Winkel zur Straßendecke hin geneigt und der konische Trichter 4 verkleinert gemäß Fig.2 diesen Neigungswinkel mit seiner Achse. Vor der Eintrittsöffnung 5 des Mantelgehäuses 2 ist ein nicht näher dargestellter Gasbrenner 7 angeordnet, dessen Flammenstrahl in das Innere des Mantelgehäuses 2 gerichtet ist. Dem Gasbrenner 7 wird über eine am Wagen 1 angebrachte feste Zuleitung 8 ein gasförmiger Brennstoff, üblicherweise Propangas, zugeführt; an der festen Zuleitung 8 ist eine flexible Zuleitung 9 angeschlossen, die zum nicht dargestellten Brennstoff-Vorratsbehälter führt.The device shown in FIGS. 1 and 2 for repairing asphalt road surfaces has a single-axle carriage 1 with two wheels, the is expediently manufactured as a welded pipe construction. On the carriage 1, a casing 2 is fixed. The casing 2 consists of a cylindrical tubular part 3, which is open to the atmosphere at its end 5 facing away from the road surface S and a conical funnel 4 with a tapered outlet opening 6 is welded to the end of the road surface. A protective grille (not shown) can also be attached in front of the outlet opening 6 of the conical funnel 4. The axis of the cylindrical part 3 of the casing 2 is inclined at an acute angle to the road surface in the operating position of the device and the conical funnel 4 reduces this inclination angle with its axis according to FIG. A gas burner 7 (not shown in detail) is arranged in front of the inlet opening 5 of the casing 2, the flame jet of which is directed into the interior of the casing 2. A gaseous fuel, usually propane gas, is supplied to the gas burner 7 via a fixed feed line 8 attached to the carriage 1; on the fixed feed line 8, a flexible feed line 9 is connected, which leads to the fuel reservoir, not shown.

Im Inneren des Mantelgehäuses 2 ist ein von Druckluft durchströmter Wärmetauscher vor dem Flammenstrahl des Gasbrenners 7 angeordnet. Der Wärmetauscher besteht gemäß Fig.2 aus einer Rohrspirale 10, deren Windungen gleichen Durchmessers sich im rohrförmigen Teil 3 des Mantelgehäuses 2 befinden und sich in dessen Längsrichtung erstrecken. Das offene Ende 11 der Rohrspirale 10 ist geradlinig durch den konischen Trichter 4 des Mantelgehäuses 2 geführt, und zwar derart, daß ihre Austrittsöffnung 12 bis nahe an die verjüngte Austrittsöffnung 6 des konischen Trichters 4 des Mantelgehäuses 2 heranreicht. An der Austrittsöffnung 12 aus der Rohrspirale 10 ist zweckmäßig eine zusätzliche Austrittsdüse angeordnet (nicht dargestellt). Die Austrittsöffnung 12 für die Druckluft ist somit im Mantelgehäuse 2 noch etwas innerhalb des konischen Trichters 4 von einer etwa ringförmigen Austrittsöffnung für das brennerseitig herbeigeführte Gas-Frischluft-Gemisch umgeben, so daß getrennte Heißluftausgänge für die durch die Rohrspirale 10 geleitete Druckluft und das aus dem Mantelgehäuse 2 angesaugte Gas-Frischluft-Gemisch vorhanden sind. Die Druckluft wird der Rohrspirale 10 über eine am Wagen 1 angebrachte feste Zuleitung 13 zugeführt, die an einer flexiblen, zum nicht dargestellten Kompressor führenden Zuleitung 14 angeschlossen ist. Die feste Zuleitung 13 für die Druckluft kann zugleich als Bedienungshandgriff für das Gerät ausgebildet sein, aus dem das obere Ende der Rohrspirale 10 an geeigneter Stelle herausgeführt ist.In the interior of the casing 2, a heat exchanger through which compressed air flows is arranged in front of the flame jet of the gas burner 7. According to FIG. 2, the heat exchanger consists of a tube spiral 10, the turns of the same diameter of which are located in the tubular part 3 of the jacket housing 2 and extend in the longitudinal direction thereof. The open end 11 of the spiral tube 10 is guided in a straight line through the conical funnel 4 of the casing 2, in such a way that its outlet opening 12 comes close to the tapered outlet opening 6 of the conical funnel 4 of the casing 2. An additional outlet nozzle (not shown) is expediently arranged at the outlet opening 12 from the pipe spiral 10. The outlet opening 12 for the compressed air is thus still somewhat surrounded in the conical funnel 4 by an approximately ring-shaped outlet opening for the gas-fresh air mixture brought about on the burner side, so that separate hot air outlets for the compressed air conducted through the spiral tube 10 and that from the Shell housing 2 sucked gas-fresh air mixture are present. The compressed air is fed to the spiral tube 10 via a fixed supply line 13 attached to the carriage 1, which is connected to a flexible supply line 14 leading to the compressor (not shown). The fixed supply line 13 for the compressed air can also be designed as an operating handle for the device, from which the upper end of the spiral tube 10 is led out at a suitable point.

Die Zuleitungen 8 und 13 für Brennstoff bzw. Druckluft weisen an leicht zugänglicher Stelle Absperrventile 15 bzw. 16 auf. Brennstoff-Vorratsbehälter und Kompressor befinden sich auf einem mitfahrenden Lastkraftwagen.The supply lines 8 and 13 for fuel or compressed air have shut-off valves 15 and 16 at an easily accessible location. The fuel storage container and compressor are located on a truck traveling with them.

Bei Inbetriebnahme des Geräts werden beide Absperrventile 15 und 16 geöffnet und der Gasbrenner 7 von Hand gezündet. Die Rohrspirale 10 wird von Druckluft durchströmt und es ergibt sich an ihrer Austrittsöffnung 12 ein kräftiger Heißluftstrahl 17, dessen Querschnitt etwa dem Rohrinnendurchmesser bzw. dem der Austrittsdüse aus der Rohrspirale 10 entspricht. Der aus dem geradlinigen Ende 11 der Rohrspirale 10 strömende Heißluftstrahl 17 entwickelt an der Austrittsöffnung 6 aus dem konischen Trichter 4 eine kräftige Saugwirkung, so daß das ihn umgebende Gas-Frischluft-Gemisch mitgerissen wird und an der offenen Eintrittsöffnung 5 in vermehrtem Maß Frischluft nachströmt, wodurch sich eine ausgeprägte Flamme am Gasbrenner 7 bildet, die die Windungen der Rohrspirale 10 umhüllt. Der verhältnismäßig dünne, aus der verjüngten Austrittsöffnung 6 mit hoher Geschwindigkeit austretende Heißluftstrahl 17 der Druckluft ist also ringsum von einem Strahl 18 niedrigerer Strömungsgeschwindigkeit umgeben, der aus dem brennenden Arbeitsgas und der angesaugten Frischluft besteht. Der mittige Druckluft-Heißstrahl 17 hoher Strömungsgeschwindigkeit wird von der Bedienungsperson unter einem spitzen Winkel direkt in die auszubessernde Fuge F in der Straßendecke S gerichtet, dringt also mit schräger Neigung tief in diese ein und bläst sie somit frei von allen Verunreinigungen, wie Steinen, Schmutz, Sand oder dgl., und sorgt aufgrund seiner hohen Temperatur zugleich auch für ein Schmelzen des in der Asphaltdecke vorhandenen Bitumens innerhalb der Fuge F, während der ihn ringförmig umgebende Gas-Frischluft-Heißstrahl 18 geringerer Strömungsgeschwindigkeit, für ein breites Abschmelzen des Bitumens an den beiden Fugenrändern sorgt. Derart vorbehandelte Fugen lassen sich in einem unmittelbar oder ggf. auch später nachfolgenden Arbeitsgang zuverlässig mit dauerelastischer Vergußmasse ausfüllen.When the device is started up, both shut-off valves 15 and 16 are opened and the gas burner 7 is ignited by hand. Compressed air flows through the tube spiral 10 and a strong hot air jet 17 results at its outlet opening 12, the cross section of which corresponds approximately to the tube inner diameter or that of the outlet nozzle from the tube spiral 10. The hot air jet 17 flowing out of the rectilinear end 11 of the spiral tube 10 develops a strong suction effect at the outlet opening 6 from the conical funnel 4, so that the gas-fresh air mixture surrounding it is entrained and fresh air flows in at the open inlet opening 5 to an increased extent, whereby a distinctive flame forms on the gas burner 7, which envelops the turns of the spiral tube 10. The relatively thin hot air jet 17 of the compressed air emerging from the tapered outlet opening 6 at high speed is thus surrounded by a jet 18 of lower flow speed, which consists of the burning working gas and the fresh air drawn in. The central compressed air hot jet 17 of high flow speed is directed by the operator at an acute angle directly into the joint F to be repaired in the road surface S, so penetrates deep into it with an oblique inclination and thus blows it free of all impurities such as stones and dirt , Sand or the like, and due to its high temperature also ensures a melting of the bitumen present in the asphalt surface within the joint F, while the gas-fresh air hot jet 18 surrounding it at a lower flow rate, for a wide melting of the bitumen at the ensures both joint edges. Joints pretreated in this way can be reliably filled with permanently elastic casting compound in an immediately or possibly later subsequent operation.

Die Temperaturen und die Ausströmgeschwindigkeiten der beiden Arbeitsgase, Heißluftstrahl 17 aus Druckluft und der diesen umgebende Strahl 18 aus dem gasförmigen Brennstoff samt angesaugter Frischluft lassen sich mittels der Absperrventile 15 bzw. 16 in gewissen Grenzen regulieren bzw. optimal aufeinander abstimmen.The temperatures and the outflow speeds of the two working gases, hot air jet 17 from compressed air and the jet 18 surrounding them from the gaseous fuel together with the fresh air drawn in, can be regulated within certain limits or optimally coordinated with one another by means of the shut-off valves 15 and 16.

Bei kurzzeitiger Außerbetriebnahme des Geräts genügt es, das Druckluft-Absperrventil 16 zu sperren und den Brennstoffdurchsatz am Absperrventil 15 zu drosseln, ohne die Brennerflamme erlöschen zu lassen; das Gerät kann dann mit seinem Bedienungshandgriff auf der Straßendecke S abgesetzt werden und steht weiterhin betriebsbereit zur Verfügung.In the event of a brief shutdown of the device, it is sufficient to block the compressed air shut-off valve 16 and to reduce the fuel throughput at the shut-off valve 15 without letting the burner flame go out; the device can then be placed on the road surface S with its operating handle and is still ready for use.

Claims (3)

1. Fixture to clean melt and distribute sealing compound for filling road surface joints and cracks, using a vehicle fitted with a housing, which on the side facing the road surface has a tapered outlet and on the side away from the road surface has an unobstructed inlet, which has a gas burner with a gas supply pipe in front of it, and leading into the housing is a compressed sir pipe with a straightlined end and outlet, during operation, the outflowing hot air jet from the tapered outlet is able to be directed at an acute angle to the joint that needs repairing, characterised by the fact that pipe (10, 11) is designed as a heat exchanger which traverses the housing (2) in spiral form, and with its outlet (12) is routed to about the same level as the tapered outlet (6) of the housing (2), to provide separate hot air outlets for the compressed air and the gas air mixture.
2. Fixture as in Claim 1, characterised by the fact that the helix of the pipe spirals (10) expands conically in the longitudinal direction of the housing (2).
3. Fixture as in Claim 1 or 2 characterised by the fact that the tapered outlet (6) of the housing (2) has a protective grid.
EP87105451A 1986-04-15 1987-04-13 Device for cleaning, melting and widening joints or cracks in asphalt pavements Expired - Lifetime EP0241895B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87105451T ATE56494T1 (en) 1986-04-15 1987-04-13 DEVICE FOR CLEANING, MELTING AND WIDENING JOINTS OR CRACKS IN ASPHALT PAVEMENTS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3612685 1986-04-15
DE19863612685 DE3612685C1 (en) 1986-02-19 1986-04-15 Device for cleaning, melting and widening joints or cracks in asphalt road pavings

Publications (3)

Publication Number Publication Date
EP0241895A2 EP0241895A2 (en) 1987-10-21
EP0241895A3 EP0241895A3 (en) 1988-07-20
EP0241895B1 true EP0241895B1 (en) 1990-09-12

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Application Number Title Priority Date Filing Date
EP87105451A Expired - Lifetime EP0241895B1 (en) 1986-04-15 1987-04-13 Device for cleaning, melting and widening joints or cracks in asphalt pavements

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EP (1) EP0241895B1 (en)
AT (1) ATE56494T1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112112038B (en) * 2020-08-31 2022-05-17 江苏建通绿色工程有限公司 A pretreatment type seam filling machine with built-in heating and feeding device
CN114703731B (en) * 2022-03-30 2024-05-14 东营广通科技有限公司 Device for repairing pavement cracks
CN115404752B (en) * 2022-09-19 2024-06-07 临漳县锦程公路养护工程有限公司 Rapid sealing and reinforcing system and method for highway expansion joint

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7139783U (en) * 1972-01-13 Marks & Co Road construction device for treating pavement joints with a stream of hot air
DE1908200C3 (en) * 1969-02-19 1980-05-22 Chemische Fabrik Biebrich Vorm. Seck & Dr. Alt, Gmbh, 6200 Wiesbaden Device for drying and heating joints

Also Published As

Publication number Publication date
ATE56494T1 (en) 1990-09-15
EP0241895A2 (en) 1987-10-21
EP0241895A3 (en) 1988-07-20

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