CA1300417C - Apparatus for reproducing the asphalt road surface - Google Patents
Apparatus for reproducing the asphalt road surfaceInfo
- Publication number
- CA1300417C CA1300417C CA000609196A CA609196A CA1300417C CA 1300417 C CA1300417 C CA 1300417C CA 000609196 A CA000609196 A CA 000609196A CA 609196 A CA609196 A CA 609196A CA 1300417 C CA1300417 C CA 1300417C
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- road surface
- vehicle
- reproducing
- heating
- road
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Abstract
ABSTRACT
An apparatus for reproducing the deteriorated asphalt road surface consists of a road surface heating vehicle and a road surface reproducing vehicle. The former provides a fuel supply system including a fan adapted to blow air to a fuel tank to accelerate vaporization of fuel when fuel pressure droped to the predetermined pressure.
The latter provides a rotor room wherein a plurality of rotors whose rotational direction are opposite to that of adjacent one are provided and are adapted to move vertically to adjust biting depth and to be heated such that blocks of the asphalt materials rolled up by the rotor can be heated when they contact with an arcuately shaped heating room located upperside of the rotor room.
Advancing these two vehicles keeping an adequate spacing therebetween, the reproduction of asphalt pavement can be effectively performed.
An apparatus for reproducing the deteriorated asphalt road surface consists of a road surface heating vehicle and a road surface reproducing vehicle. The former provides a fuel supply system including a fan adapted to blow air to a fuel tank to accelerate vaporization of fuel when fuel pressure droped to the predetermined pressure.
The latter provides a rotor room wherein a plurality of rotors whose rotational direction are opposite to that of adjacent one are provided and are adapted to move vertically to adjust biting depth and to be heated such that blocks of the asphalt materials rolled up by the rotor can be heated when they contact with an arcuately shaped heating room located upperside of the rotor room.
Advancing these two vehicles keeping an adequate spacing therebetween, the reproduction of asphalt pavement can be effectively performed.
Description
~300417 1. TITLE OF THE INVENTION
APPARATUS FOR REPRODUCING THE ASPHALT ROAD SURFACE
APPARATUS FOR REPRODUCING THE ASPHALT ROAD SURFACE
2. BACKGROUND OF THE INVENTION
[Field of the invention]
This invention relates to an apparatus for reproducing the deteriorated asphalt road surface and more particularly to mechanical constructions of a road surface heating vehicle and a road surface reproducing vehicle, and additionally to an effective operation when said two vehicles are employed in corporation.
Conventional way of reproducing the deteriorated asphalt road surface by way of heating the surface, and then scarifying the surface, adding some reproductive additives and new asphalt composite thereinto and fainally finishing by rolling is well known. A road surface heating vehicle provides the heating panels underside of the body and propane gas cylinders which are placed upperside of the body and connected to the heating panels by way of piping. A road surface reproducing vehicle provides heaters, a scarifier, mixers, spreaders, and a screed, and these elements are arranged underside of the body from front to rear in order as described above.
13~)041~
1 According to the conventional road surface heating vehicles, when liquid propane vaporizes, it absorbs heat from the surroudings for evaporation. As a result, the vaporizers are cooled so much and propane liquid can not further vaporize. This may often result in a failure to cause the heating panels to be kept at a required level of calorie, causing a remarkable decrease in the working efficiency. This tendency is prominent particularly in winter season, or in a land where is a great distance above the sea level. The temperature at which the asphalt pavement can be scarified must be above the softening point of the asphalt contained in the pavement. It is requested that the average temperature of the whole asphalt mixture scarified should stay within a predetermined range at the time of rolling. If the temperature of the inside pavement to which a scarifying operation to be performed is below a softening point, the aggregates contained in the asphalt mixture are apt to be broken so that the surface of the aggregates to which no asphalt is coated are exposed.
As a result, a compaction effect of the asphalt mixture is impaired to a large extent.
According to the conventional road surface reproducing vehicles, it often occures that the temperature of the heated asphalt road surface drops before the scarifying and mixing work start. In addition, where the 13(~0417 1 road is not flat but uneven, and the scarifying depth is rather deep, the complete and uniform reproduction is difficult to attain.
[Field of the invention]
This invention relates to an apparatus for reproducing the deteriorated asphalt road surface and more particularly to mechanical constructions of a road surface heating vehicle and a road surface reproducing vehicle, and additionally to an effective operation when said two vehicles are employed in corporation.
Conventional way of reproducing the deteriorated asphalt road surface by way of heating the surface, and then scarifying the surface, adding some reproductive additives and new asphalt composite thereinto and fainally finishing by rolling is well known. A road surface heating vehicle provides the heating panels underside of the body and propane gas cylinders which are placed upperside of the body and connected to the heating panels by way of piping. A road surface reproducing vehicle provides heaters, a scarifier, mixers, spreaders, and a screed, and these elements are arranged underside of the body from front to rear in order as described above.
13~)041~
1 According to the conventional road surface heating vehicles, when liquid propane vaporizes, it absorbs heat from the surroudings for evaporation. As a result, the vaporizers are cooled so much and propane liquid can not further vaporize. This may often result in a failure to cause the heating panels to be kept at a required level of calorie, causing a remarkable decrease in the working efficiency. This tendency is prominent particularly in winter season, or in a land where is a great distance above the sea level. The temperature at which the asphalt pavement can be scarified must be above the softening point of the asphalt contained in the pavement. It is requested that the average temperature of the whole asphalt mixture scarified should stay within a predetermined range at the time of rolling. If the temperature of the inside pavement to which a scarifying operation to be performed is below a softening point, the aggregates contained in the asphalt mixture are apt to be broken so that the surface of the aggregates to which no asphalt is coated are exposed.
As a result, a compaction effect of the asphalt mixture is impaired to a large extent.
According to the conventional road surface reproducing vehicles, it often occures that the temperature of the heated asphalt road surface drops before the scarifying and mixing work start. In addition, where the 13(~0417 1 road is not flat but uneven, and the scarifying depth is rather deep, the complete and uniform reproduction is difficult to attain.
3. SUMMARY OF THE INVENTION
One object of the present invention is to propose an apparatus for reproducing the deteriorated road surface which eliminates the above mentioned problems inherent in the conventional apparatus.
According to the present invention, regardless of the ambient temperature, fuel supply to the heating panels is well performed and regardless of the uneveness of the road, the deteriorated surface is uniformly reproduced.
The road surface heating vehicle according to the present invention provides the heating panel at the underside of the body and a propane cylinder at upperside of the body, and plurarity of vaporizers paralleled with gas lines and liquid lines connected to the propane cylinder, and gas lines introduced to the heating panels respectively. Solenoid valves and pressure regulating valves are provided at both liquid and gas lines.
A propane cylinder provides a thermometer, a pressure regulating valve and a fan assembly placed at its underside and arranged to blow air to the surface of cylinder to supplement heat for vaporizing propane. When the 1 pressure in the propane cylinder is maintained over the predetermined point, the liquid valve is closed and the fan is not running. When the pressure in the propane cylinder drops under the predetermined point, the liquid valve opens to the vaporizer and the fan starts runninq.
The road surface reproducing vehicle according to the present invention provides a hopper, a bar feeder and at its underside of the body, from front to rear in order, heating panels, a scarifier, a first mixer, a rotor room, screws, and a screed. The rotor room comprises a supporting frame adapted to move up and down by power cylinders and a mixing chamber with heating room at upper side and opening section at lower side. A plurarity of rotors are disposed in a direction perpendicular to an advancing direction of the vehicle in rows so as to be rotated in a direction opposite to that of adjacent one.
The heating room is equipped with a heating means for heating an internal atmosphere to higher temperature above that of the outer air. The heating means comprises a gas burner and a blower to send heated air. The present invention is characterized in that employing above explained vehicles in corporation effectively.
~3(~0417 In accordance with one aspect of the invention there is provided an apparatus for reproducing a deteriorated asphalt road, wherein said apparatus comprises a road surface heating vehicle and a road surface reproducing vehicle in the form of a four-wheeled vehicle including an operator's cabin and an engine unit on a vehicle body frame; said road surface heating vehicle and said road surface reproducing vehicle being operatively joined to each other; said road surface heating vehicle being equipped with an hydraulic unit including an hydraulic pump and an hydraulic tank; said road surface heating vehicle being equipped with a gas tank, a fan for accelerating vaporization of liquefied gas and an automatic controlling unit for controlling gas vaporization;
said hydraulic unit, said gas tank, said fan and said controlling unit being arranged on said vehicle body frame; a vertically displaceable heater panel being arranged beneath said vehicle body frame so as to be raised and lowered by actuating said hydraulic unit, and foldable heater panels being arranged before and behind said vehicle body frame so as to be folded and unfolded by actuating said hydraulic unit;
said gas tank communicating with each of said heater panels via gas passages; said hydraulic unit communicating with said heater panels via hydraulic passages including solenoid valves and pressure regulating valves which are preset to a predetermined pressure by actuating said automatic controlling unit; wherein, said deteriorated asphalt road is heated by - 4a -activation all of said heater panels; and said road surface reproducing vehicle is equipped with an hydraulic pump arranged on said vehicle body frame, a new pavement material hopper arranged before said vehicle body frame, and small wh@els provided beneath said hopper, said road surface reproducing vehicle also being equipped with a heater panel, a scarifier, a mixer, a rotor room, a screw spreader and a screed located on the underside of said vehicle body frame;
wherein, said heater panel is arranged between said small wheels and front wheels of said road surface reproducing vehicle for heating the road surface therebetween; said scarifier is arranged in the rear of said heater panel and is provided with a plurality of claws for scarifying a surface layer of the road while the surface layer is heated and softened; said mixer is arranged to the rear of said scarifier and s~irs scarified surface layer materials; said rotor unit is arranged in rear of said mixer and has a hot air generating unit for heating the surface layer materials, said rotor unit having rotors means including bits arranged around the periphery thereof for crushing and kneading the surface layer materials with new pavement materials supplied from said new pavement material hopper; said screw spreader and said screed are arranged at the rear of said road surface reproducing vehicle, said screw spreader flattening the surface layer materials on the road and said screed screeding and compacting the surface layer materials on the road.
- 4b -13(~Q41'7 1 4. BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Fig. 1 is a side view drawing of a road surface heating vehicle according to the present invention.
Fig. 2 is a plan view of Fig. 1.
Fig. 3 is a side view drawing of a road surface reproducing vehicle according to the present invention.
Fig. 4 is an enlarged side view drawing of a rotor room of the road surface producing vehicle in Fig. 3.
Fig. 5 is a vertical section drawing of the rotor room in Fig. 4.
5. DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to the accompanying drawings, one preferred embodiment of the present invention will be explained hereinafter.
Referring to Fig. 1 and Fig. 2, a road surface heating vehicle 1 provides front wheels 3 and rear wheels 4 at underside of a body 2. Upper surface of the body 2 is formed to be flat and provides an engine unit 5, an operator's seat 6, a generator 7 and an oil pump 8 driven by the engine unit 5. The operator's seat provides instruments 6A, an operation board 6B and a steering wheel 6C. At the back of the operator's seat 6, there is disposed a tank 9 in which fuel and oil are reservoired. Disposed on the rear part of the body 2 is a large-sized gas tank 10, 1 at the front side of which are disposed a valve stand 11 and vaporizers 12 which are connected to the gas tank 10 by way of piping. Beneath the body 2 and between the front wheel 3 and the rear wheel 4 there is disposed a central heating panel 13 in such a manner that the same can be lifted up and down. More specifically , in Fig. 1, sheaves 14, 14 are disposed on the body 2 in such a manner that their axes are perpendicular to the logitudinal direction of the body 2. Suspending wires 15, 15 are applied over the sheaves 14, 14 respectively. Mounted horizontally on the body 2 is a cylinder 16 having a piston rod 16A which is connected at its tip end, with respective upper ends of the suspending wires 15, 15. From respective lower ends of the suspending wires 15, 15, there is suspended the central heating panel 13 which is lifted up or down by operation of the cylinder 16 so that its positional level as measured from the road surface may be adjusted, The central heating panel 13 is connected with gas passageway which is led from the vaporizer 12.
Further, the central heating panel 13 is allowed to widely spread outwardly from the side, or widthwise end, of the body 2.
However, when the vehicle body 2 is travelled at a time other than a remedy construction involved, the central heating panel 13 can have its outwardly spread 13~0417 1 portions folded back at hinges, not shown, which are provided right beneath the widthwise and faces of the body 2, respectively. Disposed at the front side of the body 2 is a front heating panel 18 via a supporting columnar member 17 vertically erected also at the front side of the body 2, the supporting columnar member being mounted thereon with a main frame 19 assuming a square shape as viewed from the front side of the body 2, in such a manner that it is perpendicular to the longitudinal direction of the body 2. On a lower end portion of the main frame 19 there is mounted a lower frame member 20 via a shafts l9A, such that the frame member 20 extends horizontally and forwardly from the lower end of the main frame 19.
At the central portion of the lower frame member 20 as viewed longitudinally thereof, there is provided a hinge 20A at which the lower frame member 20 can be two-folded. The reference numeral 20B denotes a means of fixing the two-folded portions of the lower frame member 20 in a state wherein they are kept at their horizontally laid posture. At the forward end of the lower frame member 20 there are disposed a pair of supporting wheels 21, 21 which are intended to cause the forward end portion of the lower frame member 20 to be maintained horizontal. A pair of winches 22, 22 are mounted, respectively, on both 13~4~7 1 widthwise, upper, end portions of the main frame 19.
From the winches 22, 22 there are extended a pair of hoisting wires 22A, respectively which are wound around sheaves 20C attached onto the lower frame member 20 respectively. Thus, when the fixation made by the fixing means 20B is released and the winches 22, 22 are driven for hoisting operation, the lower frame member 20 is erected about the shafts 19A in a manner that its central part rises with its forward end portion being directed downwards.
On the underside of the lower frame member 20 there is fixed the heating panel 18 which is allowed to spread more widely than the width of the body 2, the heating panel 18, however, being so constructed that its widthwise end portions can each be folded back downwards, at its corresponding hinges 23, from a position located slightly inwardly from a corresponding line L (Shown in Fig. 2) indicating the corresponding widthwise end of the vehicle body 2. The heating panel 18 is connected with the vaporizers 12 by piping means which are not shown. At the back of the body 2 there is disposed a rear heating panel 25 via a supporting columnar member 24. The main frame 19 and the lower frame member 20 adapted to support the rear heating panel 25, as well as the other associated structures and members are the same as in the case of the front heating ~3~Q417 1 panel 18. Evaporated propane gas in the gas tank 10 is supplied to the heating panels 18, 25.
When the supp]y pressure of propane gas is maintained above 5 kg/cm2, the gas is well distributed, but when the aas pressure lowers less than 5 kg/cm2, a fan F located at under the gas tank 10 automatically turns on and the air flows against the gas tank 10 to accelerate the gas vaporization. When the gas pressure drops below 3 kg/cm2, a gas valve closes and a liquid valve opens to introduce the liquid propane to vaporizers 12 which starts working. Thus, the gas supply to the heating panels is maintained and the heating of road surface can be conducted regardless of weather conditions without reducing their heating capacities.
Referring to Fig. 3, a road surface reproducing vehicle according to the present invention will be explained.
A road surface reproducing vehicle 30 provides front wheels 31A and rear wheels 31B and an engine 32 located on a body 33. An oil pump 32A driven by the engine 32 delivers pressurized oil for the hydro-drive mechanism. A steering wheel 33A controls the front wheels 31A. A front portion of the vehicle body 33 of the road surface reproducing machine 30 has a low slanted construction on which a hopper 34 is equipped. Extending from the lower portion of the hopper 34 to the rear portion of the body 33, a bar 1 feeder 35 is slidably mounted to transfer paving materials, which are contained in the hopper 34.
Underside of the body 33, there are provided from front to rear, a heater, a scarifier 37, a mixer M, and a rotor room 38. The heater 36 is a combination type of far infrared radiation unit and gas burners for heating the surface layer of the asphalt pavement when the pavement is repaired, i.e., reproduced. The heating temperature is variable according to the atmospheric temperature and asphalt temperature, and fuel gas is supplied from a gas container which is not shown. The scarifier 37 is provided with a plurality of claws 37A in a projecting manner.
The claws 37A are arranged in the advancing direction of the vehicle body 33 in a staggered manner to form a set of three staggered claws 37A, a plurality of which are arranged at intervals of a predetermined distance laterally, i.e., in a direction perpendicular to the advancing direction of the vehicle body 33 to make it possible to penetrate into the road surface layer. The scarifier 37 is adapted to move veritically by a power cylinder 37B.
As shown in Fig. 4 and Fig. 5, the rotor room 38 is shaped into a cage-like form defined by a supporting frame 39 provided with an opening 39A in its lower section.
The supporting frame 39 is provided with a middle ceiling 39B in an expanding manner inside the same to define a 130Q4~.7 1 mixing chamber 40 in its lower portion. In an upper section of the mixing chamber 40 is defined a heating room 41 with a help of a heat separating plate 41A which takes an arcuate form to make it possible for the plate to be brought into slidable contact with the asphalt mixture taken up by the rotation of the rotors 44, 45 in the upper portions of the rotors 44, 45, and is provided with openings 41B both in front and rear ends of the heat separating plate 41A.
In an upper portion of the heating room 41, there is provided a projecting protion 41C which projects upwards from the middle ceiling 39B, extending in a direction perpendicular to the advancing direction of the vehicle body 33 and has a double-walled construction in which an inner wall is constructed of a heat-resistant material and a hollow portion between the walls is packed with a heat insulator 41D. Below the projecting portion 41C i.s provided a heater 42 constructed of gas burners, the flames of which are directed downwardly. A pipe 42A
of the heater 42 is connected to a gas cylinder 36A
through a pipe (not shown). In an upper portion of the heater 42, there is provided a blower nozzle 43 in a longitudinal direction of the heater 42. The blower nozzle 43 is connected through a duct 43A to a blower 43B
provided in an upper portion of the middle ceiling 39B.
13~Q417 1 In the mixing chamber 40 are provided a plurality of rotors 44, 45 which are arranged in parallel with each other in a direction perpendicular to the advancing direction of the vehicle body 33. Shafts 44A, 45A for these rotors 44, 45 respectively are extended beyond the supporting frame 39 outwardly and are sustained by bearings 46, 47. A sprocket 47A is attached to the end of the shafts 44A, 45A. Above the rotors 44 and 45 and in an upper portion of the middle ceiling 39B, there are provided hydraulic motors 48 and 49, output shaft 48A and 49A of which are provided with sprockets 49B. A chain 49C runs around the sprocket 47A and 49s. The reference numeral 49D denotes a chain cover. Couplers 50 are fixed to the other ends which extend outwards from each bearing 46~ of the shafts 44A, 45A of the rotors 44, 45, i.e., to the leftward ends of the shafts 44A and 45A as shown in leftward portion of Fig. 5. The coupler 50 is provided with a coupling hole in its end face so as to receive a shaft of a rotor for width widening use.
Under aforementioned construction of the road surface reproducing vehicle 30, how to operate the vehicle will be explained hereinafter. A description will be made as to a partial surface layer reproducing work for the case where cracks, exfoliations or the like defects are developed in the surface layer of the asphalt pavement.
- 12 ~
1 On a work site, the hopper 34 is filled with the asphalt mixture and the road surface layer is heated by the heatcr 36. In the operation, it is necessary to heat the asphalt materials layer to a softening temperature, so that a far infrared heater is employed to make it possible for the heat to penetrate the asphalt materials deeply below the road surface. Since it takes a certain time to transmit the heat through the pavement materials, it is necessary to heat the pavement materials beforehand by means of the road surface heating vehicle for a predetermined period of time prior to scarification with the scarifier 37.
After judging from the assumed temperature at inside of the road pavement, the road surface reproducing vehicle 30 starts. The scarifier 37 and the rotors 44, 45 with bits 52, 53 attached thereto are lowered so that the claw 37A and bits 52, 53 penetrate into the predetermined depth. In this case the conically shaped bits 52 of the front rotor 44 are set as to be lowered to penetrate into the pavement surface layer by the depth of 5 cm while the flat shaped bits 53 of the rear rotor 53 are set to penetrate into the depth of 4 cm, it is possible to crash and mix the road surface layer materials having been scarified by the scarifier 37 by use of the front rotor 44 and further to mix and sufficiently knead the road surface layer materials by ~3(~04~7 1 means of the flat shaped bits 53 of the rear rotor 45.
The heating room 41 is previously heated up to 120C
35~C by the heater 42 with the hot air nozzle 43A
connected to the blower nozzle 43. Thus, the insulating S panel 4lA is heated and consequently the rotors 44, 45 are heated too.
In the rotor room 40, the pavement surface is scarified and knead and is further heated by the high atmospheric temperature in the rotor room 40 and by the heat exchange effected when the blocks of the pavement touch with the heat separating panel 4lA which is maintained at high temperature. Thus, good kneading and mixing work can be expected.
In this case, the asphalt pavement surface layer materials are further heated in the mixing chamber 40 so as to increase its temperature by an amount of 10 to 30 centi-degrees. In the above mixing operation of the asphalt pavement surface layer materials, it is possible to improve in quality the asphalt mixture by adequately injecting suitable additives from a injection nozzle 54.
The additives which are expected to increase the pavement quality are transfered from the hopper 34 to backward by the bar feeder 35 and sprayed onto the front of a second screw spreader 58 which evens the new pavement materials thus fed at a certain level, and thereafter, a succeeding 13()0417 1 second screed 59 screeds the pavement materials.
A first screw spreader 56 positioned ahead of the second screw spreader 58, and the first screed 57 perform screeding and compacting of the pavement materials in a level below the road surface, while the second spreader 58 and a second screed 59 positioned after the second spreader 58 perform a finish screeding and compacting of the pavement materials.
The present invention is not limited only to the above described construction. Namely, though in the above construction, two units of the rotors 44 and 45 are employed, it is also possible to employ three, four or more units of the rotors 44 and 45 in the road surface layer reproduction machine of the present invention.
It is also possible to employ other configurations of the rotors 44 and 45 and other rotational directions and spreeds thereof. This kind of method has been known as the method called Remixing method and if a new material is supplied after the first mixer M, it is also known as Repavement method. The present machine is freely selected either Remixing method or Repavement one in accordance with the conditions of the road surface layer to be remedied or reproduced.
One object of the present invention is to propose an apparatus for reproducing the deteriorated road surface which eliminates the above mentioned problems inherent in the conventional apparatus.
According to the present invention, regardless of the ambient temperature, fuel supply to the heating panels is well performed and regardless of the uneveness of the road, the deteriorated surface is uniformly reproduced.
The road surface heating vehicle according to the present invention provides the heating panel at the underside of the body and a propane cylinder at upperside of the body, and plurarity of vaporizers paralleled with gas lines and liquid lines connected to the propane cylinder, and gas lines introduced to the heating panels respectively. Solenoid valves and pressure regulating valves are provided at both liquid and gas lines.
A propane cylinder provides a thermometer, a pressure regulating valve and a fan assembly placed at its underside and arranged to blow air to the surface of cylinder to supplement heat for vaporizing propane. When the 1 pressure in the propane cylinder is maintained over the predetermined point, the liquid valve is closed and the fan is not running. When the pressure in the propane cylinder drops under the predetermined point, the liquid valve opens to the vaporizer and the fan starts runninq.
The road surface reproducing vehicle according to the present invention provides a hopper, a bar feeder and at its underside of the body, from front to rear in order, heating panels, a scarifier, a first mixer, a rotor room, screws, and a screed. The rotor room comprises a supporting frame adapted to move up and down by power cylinders and a mixing chamber with heating room at upper side and opening section at lower side. A plurarity of rotors are disposed in a direction perpendicular to an advancing direction of the vehicle in rows so as to be rotated in a direction opposite to that of adjacent one.
The heating room is equipped with a heating means for heating an internal atmosphere to higher temperature above that of the outer air. The heating means comprises a gas burner and a blower to send heated air. The present invention is characterized in that employing above explained vehicles in corporation effectively.
~3(~0417 In accordance with one aspect of the invention there is provided an apparatus for reproducing a deteriorated asphalt road, wherein said apparatus comprises a road surface heating vehicle and a road surface reproducing vehicle in the form of a four-wheeled vehicle including an operator's cabin and an engine unit on a vehicle body frame; said road surface heating vehicle and said road surface reproducing vehicle being operatively joined to each other; said road surface heating vehicle being equipped with an hydraulic unit including an hydraulic pump and an hydraulic tank; said road surface heating vehicle being equipped with a gas tank, a fan for accelerating vaporization of liquefied gas and an automatic controlling unit for controlling gas vaporization;
said hydraulic unit, said gas tank, said fan and said controlling unit being arranged on said vehicle body frame; a vertically displaceable heater panel being arranged beneath said vehicle body frame so as to be raised and lowered by actuating said hydraulic unit, and foldable heater panels being arranged before and behind said vehicle body frame so as to be folded and unfolded by actuating said hydraulic unit;
said gas tank communicating with each of said heater panels via gas passages; said hydraulic unit communicating with said heater panels via hydraulic passages including solenoid valves and pressure regulating valves which are preset to a predetermined pressure by actuating said automatic controlling unit; wherein, said deteriorated asphalt road is heated by - 4a -activation all of said heater panels; and said road surface reproducing vehicle is equipped with an hydraulic pump arranged on said vehicle body frame, a new pavement material hopper arranged before said vehicle body frame, and small wh@els provided beneath said hopper, said road surface reproducing vehicle also being equipped with a heater panel, a scarifier, a mixer, a rotor room, a screw spreader and a screed located on the underside of said vehicle body frame;
wherein, said heater panel is arranged between said small wheels and front wheels of said road surface reproducing vehicle for heating the road surface therebetween; said scarifier is arranged in the rear of said heater panel and is provided with a plurality of claws for scarifying a surface layer of the road while the surface layer is heated and softened; said mixer is arranged to the rear of said scarifier and s~irs scarified surface layer materials; said rotor unit is arranged in rear of said mixer and has a hot air generating unit for heating the surface layer materials, said rotor unit having rotors means including bits arranged around the periphery thereof for crushing and kneading the surface layer materials with new pavement materials supplied from said new pavement material hopper; said screw spreader and said screed are arranged at the rear of said road surface reproducing vehicle, said screw spreader flattening the surface layer materials on the road and said screed screeding and compacting the surface layer materials on the road.
- 4b -13(~Q41'7 1 4. BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Fig. 1 is a side view drawing of a road surface heating vehicle according to the present invention.
Fig. 2 is a plan view of Fig. 1.
Fig. 3 is a side view drawing of a road surface reproducing vehicle according to the present invention.
Fig. 4 is an enlarged side view drawing of a rotor room of the road surface producing vehicle in Fig. 3.
Fig. 5 is a vertical section drawing of the rotor room in Fig. 4.
5. DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to the accompanying drawings, one preferred embodiment of the present invention will be explained hereinafter.
Referring to Fig. 1 and Fig. 2, a road surface heating vehicle 1 provides front wheels 3 and rear wheels 4 at underside of a body 2. Upper surface of the body 2 is formed to be flat and provides an engine unit 5, an operator's seat 6, a generator 7 and an oil pump 8 driven by the engine unit 5. The operator's seat provides instruments 6A, an operation board 6B and a steering wheel 6C. At the back of the operator's seat 6, there is disposed a tank 9 in which fuel and oil are reservoired. Disposed on the rear part of the body 2 is a large-sized gas tank 10, 1 at the front side of which are disposed a valve stand 11 and vaporizers 12 which are connected to the gas tank 10 by way of piping. Beneath the body 2 and between the front wheel 3 and the rear wheel 4 there is disposed a central heating panel 13 in such a manner that the same can be lifted up and down. More specifically , in Fig. 1, sheaves 14, 14 are disposed on the body 2 in such a manner that their axes are perpendicular to the logitudinal direction of the body 2. Suspending wires 15, 15 are applied over the sheaves 14, 14 respectively. Mounted horizontally on the body 2 is a cylinder 16 having a piston rod 16A which is connected at its tip end, with respective upper ends of the suspending wires 15, 15. From respective lower ends of the suspending wires 15, 15, there is suspended the central heating panel 13 which is lifted up or down by operation of the cylinder 16 so that its positional level as measured from the road surface may be adjusted, The central heating panel 13 is connected with gas passageway which is led from the vaporizer 12.
Further, the central heating panel 13 is allowed to widely spread outwardly from the side, or widthwise end, of the body 2.
However, when the vehicle body 2 is travelled at a time other than a remedy construction involved, the central heating panel 13 can have its outwardly spread 13~0417 1 portions folded back at hinges, not shown, which are provided right beneath the widthwise and faces of the body 2, respectively. Disposed at the front side of the body 2 is a front heating panel 18 via a supporting columnar member 17 vertically erected also at the front side of the body 2, the supporting columnar member being mounted thereon with a main frame 19 assuming a square shape as viewed from the front side of the body 2, in such a manner that it is perpendicular to the longitudinal direction of the body 2. On a lower end portion of the main frame 19 there is mounted a lower frame member 20 via a shafts l9A, such that the frame member 20 extends horizontally and forwardly from the lower end of the main frame 19.
At the central portion of the lower frame member 20 as viewed longitudinally thereof, there is provided a hinge 20A at which the lower frame member 20 can be two-folded. The reference numeral 20B denotes a means of fixing the two-folded portions of the lower frame member 20 in a state wherein they are kept at their horizontally laid posture. At the forward end of the lower frame member 20 there are disposed a pair of supporting wheels 21, 21 which are intended to cause the forward end portion of the lower frame member 20 to be maintained horizontal. A pair of winches 22, 22 are mounted, respectively, on both 13~4~7 1 widthwise, upper, end portions of the main frame 19.
From the winches 22, 22 there are extended a pair of hoisting wires 22A, respectively which are wound around sheaves 20C attached onto the lower frame member 20 respectively. Thus, when the fixation made by the fixing means 20B is released and the winches 22, 22 are driven for hoisting operation, the lower frame member 20 is erected about the shafts 19A in a manner that its central part rises with its forward end portion being directed downwards.
On the underside of the lower frame member 20 there is fixed the heating panel 18 which is allowed to spread more widely than the width of the body 2, the heating panel 18, however, being so constructed that its widthwise end portions can each be folded back downwards, at its corresponding hinges 23, from a position located slightly inwardly from a corresponding line L (Shown in Fig. 2) indicating the corresponding widthwise end of the vehicle body 2. The heating panel 18 is connected with the vaporizers 12 by piping means which are not shown. At the back of the body 2 there is disposed a rear heating panel 25 via a supporting columnar member 24. The main frame 19 and the lower frame member 20 adapted to support the rear heating panel 25, as well as the other associated structures and members are the same as in the case of the front heating ~3~Q417 1 panel 18. Evaporated propane gas in the gas tank 10 is supplied to the heating panels 18, 25.
When the supp]y pressure of propane gas is maintained above 5 kg/cm2, the gas is well distributed, but when the aas pressure lowers less than 5 kg/cm2, a fan F located at under the gas tank 10 automatically turns on and the air flows against the gas tank 10 to accelerate the gas vaporization. When the gas pressure drops below 3 kg/cm2, a gas valve closes and a liquid valve opens to introduce the liquid propane to vaporizers 12 which starts working. Thus, the gas supply to the heating panels is maintained and the heating of road surface can be conducted regardless of weather conditions without reducing their heating capacities.
Referring to Fig. 3, a road surface reproducing vehicle according to the present invention will be explained.
A road surface reproducing vehicle 30 provides front wheels 31A and rear wheels 31B and an engine 32 located on a body 33. An oil pump 32A driven by the engine 32 delivers pressurized oil for the hydro-drive mechanism. A steering wheel 33A controls the front wheels 31A. A front portion of the vehicle body 33 of the road surface reproducing machine 30 has a low slanted construction on which a hopper 34 is equipped. Extending from the lower portion of the hopper 34 to the rear portion of the body 33, a bar 1 feeder 35 is slidably mounted to transfer paving materials, which are contained in the hopper 34.
Underside of the body 33, there are provided from front to rear, a heater, a scarifier 37, a mixer M, and a rotor room 38. The heater 36 is a combination type of far infrared radiation unit and gas burners for heating the surface layer of the asphalt pavement when the pavement is repaired, i.e., reproduced. The heating temperature is variable according to the atmospheric temperature and asphalt temperature, and fuel gas is supplied from a gas container which is not shown. The scarifier 37 is provided with a plurality of claws 37A in a projecting manner.
The claws 37A are arranged in the advancing direction of the vehicle body 33 in a staggered manner to form a set of three staggered claws 37A, a plurality of which are arranged at intervals of a predetermined distance laterally, i.e., in a direction perpendicular to the advancing direction of the vehicle body 33 to make it possible to penetrate into the road surface layer. The scarifier 37 is adapted to move veritically by a power cylinder 37B.
As shown in Fig. 4 and Fig. 5, the rotor room 38 is shaped into a cage-like form defined by a supporting frame 39 provided with an opening 39A in its lower section.
The supporting frame 39 is provided with a middle ceiling 39B in an expanding manner inside the same to define a 130Q4~.7 1 mixing chamber 40 in its lower portion. In an upper section of the mixing chamber 40 is defined a heating room 41 with a help of a heat separating plate 41A which takes an arcuate form to make it possible for the plate to be brought into slidable contact with the asphalt mixture taken up by the rotation of the rotors 44, 45 in the upper portions of the rotors 44, 45, and is provided with openings 41B both in front and rear ends of the heat separating plate 41A.
In an upper portion of the heating room 41, there is provided a projecting protion 41C which projects upwards from the middle ceiling 39B, extending in a direction perpendicular to the advancing direction of the vehicle body 33 and has a double-walled construction in which an inner wall is constructed of a heat-resistant material and a hollow portion between the walls is packed with a heat insulator 41D. Below the projecting portion 41C i.s provided a heater 42 constructed of gas burners, the flames of which are directed downwardly. A pipe 42A
of the heater 42 is connected to a gas cylinder 36A
through a pipe (not shown). In an upper portion of the heater 42, there is provided a blower nozzle 43 in a longitudinal direction of the heater 42. The blower nozzle 43 is connected through a duct 43A to a blower 43B
provided in an upper portion of the middle ceiling 39B.
13~Q417 1 In the mixing chamber 40 are provided a plurality of rotors 44, 45 which are arranged in parallel with each other in a direction perpendicular to the advancing direction of the vehicle body 33. Shafts 44A, 45A for these rotors 44, 45 respectively are extended beyond the supporting frame 39 outwardly and are sustained by bearings 46, 47. A sprocket 47A is attached to the end of the shafts 44A, 45A. Above the rotors 44 and 45 and in an upper portion of the middle ceiling 39B, there are provided hydraulic motors 48 and 49, output shaft 48A and 49A of which are provided with sprockets 49B. A chain 49C runs around the sprocket 47A and 49s. The reference numeral 49D denotes a chain cover. Couplers 50 are fixed to the other ends which extend outwards from each bearing 46~ of the shafts 44A, 45A of the rotors 44, 45, i.e., to the leftward ends of the shafts 44A and 45A as shown in leftward portion of Fig. 5. The coupler 50 is provided with a coupling hole in its end face so as to receive a shaft of a rotor for width widening use.
Under aforementioned construction of the road surface reproducing vehicle 30, how to operate the vehicle will be explained hereinafter. A description will be made as to a partial surface layer reproducing work for the case where cracks, exfoliations or the like defects are developed in the surface layer of the asphalt pavement.
- 12 ~
1 On a work site, the hopper 34 is filled with the asphalt mixture and the road surface layer is heated by the heatcr 36. In the operation, it is necessary to heat the asphalt materials layer to a softening temperature, so that a far infrared heater is employed to make it possible for the heat to penetrate the asphalt materials deeply below the road surface. Since it takes a certain time to transmit the heat through the pavement materials, it is necessary to heat the pavement materials beforehand by means of the road surface heating vehicle for a predetermined period of time prior to scarification with the scarifier 37.
After judging from the assumed temperature at inside of the road pavement, the road surface reproducing vehicle 30 starts. The scarifier 37 and the rotors 44, 45 with bits 52, 53 attached thereto are lowered so that the claw 37A and bits 52, 53 penetrate into the predetermined depth. In this case the conically shaped bits 52 of the front rotor 44 are set as to be lowered to penetrate into the pavement surface layer by the depth of 5 cm while the flat shaped bits 53 of the rear rotor 53 are set to penetrate into the depth of 4 cm, it is possible to crash and mix the road surface layer materials having been scarified by the scarifier 37 by use of the front rotor 44 and further to mix and sufficiently knead the road surface layer materials by ~3(~04~7 1 means of the flat shaped bits 53 of the rear rotor 45.
The heating room 41 is previously heated up to 120C
35~C by the heater 42 with the hot air nozzle 43A
connected to the blower nozzle 43. Thus, the insulating S panel 4lA is heated and consequently the rotors 44, 45 are heated too.
In the rotor room 40, the pavement surface is scarified and knead and is further heated by the high atmospheric temperature in the rotor room 40 and by the heat exchange effected when the blocks of the pavement touch with the heat separating panel 4lA which is maintained at high temperature. Thus, good kneading and mixing work can be expected.
In this case, the asphalt pavement surface layer materials are further heated in the mixing chamber 40 so as to increase its temperature by an amount of 10 to 30 centi-degrees. In the above mixing operation of the asphalt pavement surface layer materials, it is possible to improve in quality the asphalt mixture by adequately injecting suitable additives from a injection nozzle 54.
The additives which are expected to increase the pavement quality are transfered from the hopper 34 to backward by the bar feeder 35 and sprayed onto the front of a second screw spreader 58 which evens the new pavement materials thus fed at a certain level, and thereafter, a succeeding 13()0417 1 second screed 59 screeds the pavement materials.
A first screw spreader 56 positioned ahead of the second screw spreader 58, and the first screed 57 perform screeding and compacting of the pavement materials in a level below the road surface, while the second spreader 58 and a second screed 59 positioned after the second spreader 58 perform a finish screeding and compacting of the pavement materials.
The present invention is not limited only to the above described construction. Namely, though in the above construction, two units of the rotors 44 and 45 are employed, it is also possible to employ three, four or more units of the rotors 44 and 45 in the road surface layer reproduction machine of the present invention.
It is also possible to employ other configurations of the rotors 44 and 45 and other rotational directions and spreeds thereof. This kind of method has been known as the method called Remixing method and if a new material is supplied after the first mixer M, it is also known as Repavement method. The present machine is freely selected either Remixing method or Repavement one in accordance with the conditions of the road surface layer to be remedied or reproduced.
Claims (2)
1. An apparatus for reproducing a deteriorated asphalt road, wherein said apparatus comprises a road surface heating vehicle and a road surface reproducing vehicle in the form of a four-wheeled vehicle including an operator's cabin and an engine unit on a vehicle body frame;
said road surface heating vehicle and said road surface reproducing vehicle being operatively joined to each other;
said road surface heating vehicle being equipped with an hydraulic unit including an hydraulic pump and an hydraulic tank;
said road surface heating vehicle being equipped with a gas tank, a fan for accelerating vaporization of liquefied gas and an automatic controlling unit for controlling gas vaporization;
said hydraulic unit, said gas tank, said fan and said controlling unit being arranged on said vehicle body frame;
a vertically displaceable heater panel being arranged beneath said vehicle body frame so as to be raised and lowered by actuating said hydraulic unit, and foldable heater panels being arranged before and behind said vehicle body frame so as to be folded and unfolded by actuating said hydraulic unit;
said gas tank communicating with each of said heater panels via gas passages;
said hydraulic unit communicating with said heater panels via hydraulic passages including solenoid valves and pressure regulating valves which are preset to a predetermined pressure by actuating said automatic controlling unit;
wherein, said deteriorated asphalt road is heated by activation all of said heater panels; and said road surface reproducing vehicle is equipped with an hydraulic pump arranged on said vehicle body frame, a new pavement material hopper arranged before said vehicle body frame, and small wheels provided beneath said hopper, said road surface reproducing vehicle also being equipped with a heater panel, a scarifier, a mixer, a rotor room, a screw spreader and a screed located on the underside of said vehicle body frame;
wherein, said heater panel is arranged between said small wheels and front wheels of said road surface reproducing vehicle for heating the road surface therebetween;
said scarifier is arranged in the rear of said heater panel and is provided with a plurality of claws for scarifying a surface layer of the road while the surface layer is heated and softened;
said mixer is arranged to the rear of said scarifier and stirs scarified surface layer materials;
said rotor unit is arranged in rear of said mixer and has a hot air generating unit for heating the surface layer materials, said rotor unit having rotors means including bits arranged around the periphery thereof for crushing and kneading the surface layer materials with new pavement materials supplied from said new pavement material hopper;
said screw spreader and said screed are arranged at the rear of said road surface reproducing vehicle, said screw spreader flattening the surface layer materials on the road and said screed screeding and compacting the surface layer materials on the road.
said road surface heating vehicle and said road surface reproducing vehicle being operatively joined to each other;
said road surface heating vehicle being equipped with an hydraulic unit including an hydraulic pump and an hydraulic tank;
said road surface heating vehicle being equipped with a gas tank, a fan for accelerating vaporization of liquefied gas and an automatic controlling unit for controlling gas vaporization;
said hydraulic unit, said gas tank, said fan and said controlling unit being arranged on said vehicle body frame;
a vertically displaceable heater panel being arranged beneath said vehicle body frame so as to be raised and lowered by actuating said hydraulic unit, and foldable heater panels being arranged before and behind said vehicle body frame so as to be folded and unfolded by actuating said hydraulic unit;
said gas tank communicating with each of said heater panels via gas passages;
said hydraulic unit communicating with said heater panels via hydraulic passages including solenoid valves and pressure regulating valves which are preset to a predetermined pressure by actuating said automatic controlling unit;
wherein, said deteriorated asphalt road is heated by activation all of said heater panels; and said road surface reproducing vehicle is equipped with an hydraulic pump arranged on said vehicle body frame, a new pavement material hopper arranged before said vehicle body frame, and small wheels provided beneath said hopper, said road surface reproducing vehicle also being equipped with a heater panel, a scarifier, a mixer, a rotor room, a screw spreader and a screed located on the underside of said vehicle body frame;
wherein, said heater panel is arranged between said small wheels and front wheels of said road surface reproducing vehicle for heating the road surface therebetween;
said scarifier is arranged in the rear of said heater panel and is provided with a plurality of claws for scarifying a surface layer of the road while the surface layer is heated and softened;
said mixer is arranged to the rear of said scarifier and stirs scarified surface layer materials;
said rotor unit is arranged in rear of said mixer and has a hot air generating unit for heating the surface layer materials, said rotor unit having rotors means including bits arranged around the periphery thereof for crushing and kneading the surface layer materials with new pavement materials supplied from said new pavement material hopper;
said screw spreader and said screed are arranged at the rear of said road surface reproducing vehicle, said screw spreader flattening the surface layer materials on the road and said screed screeding and compacting the surface layer materials on the road.
2. The apparatus as claimed in claim 1, wherein said road surface reproducing vehicle is equipped with plural screw spreaders and plural screeds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000609196A CA1300417C (en) | 1989-08-23 | 1989-08-23 | Apparatus for reproducing the asphalt road surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000609196A CA1300417C (en) | 1989-08-23 | 1989-08-23 | Apparatus for reproducing the asphalt road surface |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1300417C true CA1300417C (en) | 1992-05-12 |
Family
ID=4140486
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000609196A Expired - Fee Related CA1300417C (en) | 1989-08-23 | 1989-08-23 | Apparatus for reproducing the asphalt road surface |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1300417C (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8556536B2 (en) | 2009-01-02 | 2013-10-15 | Heatwurx, Inc. | Asphalt repair system and method |
| US8562247B2 (en) | 2009-01-02 | 2013-10-22 | Heatwurx, Inc. | Asphalt repair system and method |
| USD700633S1 (en) | 2013-07-26 | 2014-03-04 | Heatwurx, Inc. | Asphalt repair device |
| US8801325B1 (en) | 2013-02-26 | 2014-08-12 | Heatwurx, Inc. | System and method for controlling an asphalt repair apparatus |
| EP2543765A3 (en) * | 2011-07-03 | 2016-06-22 | Lemminkainen Infra Oy | Apparatus for heating asphalt pavement |
| US9416499B2 (en) | 2009-12-31 | 2016-08-16 | Heatwurx, Inc. | System and method for sensing and managing pothole location and pothole characteristics |
| CN110004811A (en) * | 2019-04-29 | 2019-07-12 | 长安大学 | A kind of hot air heating apparatus and its method for heating and controlling of tandem bituminous pavement |
-
1989
- 1989-08-23 CA CA000609196A patent/CA1300417C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8556536B2 (en) | 2009-01-02 | 2013-10-15 | Heatwurx, Inc. | Asphalt repair system and method |
| US8562247B2 (en) | 2009-01-02 | 2013-10-22 | Heatwurx, Inc. | Asphalt repair system and method |
| US8714871B2 (en) | 2009-01-02 | 2014-05-06 | Heatwurx, Inc. | Asphalt repair system and method |
| US9022686B2 (en) | 2009-12-31 | 2015-05-05 | Heatwurx, Inc. | System and method for controlling an asphalt repair apparatus |
| US9416499B2 (en) | 2009-12-31 | 2016-08-16 | Heatwurx, Inc. | System and method for sensing and managing pothole location and pothole characteristics |
| EP2543765A3 (en) * | 2011-07-03 | 2016-06-22 | Lemminkainen Infra Oy | Apparatus for heating asphalt pavement |
| US8801325B1 (en) | 2013-02-26 | 2014-08-12 | Heatwurx, Inc. | System and method for controlling an asphalt repair apparatus |
| USD700633S1 (en) | 2013-07-26 | 2014-03-04 | Heatwurx, Inc. | Asphalt repair device |
| CN110004811A (en) * | 2019-04-29 | 2019-07-12 | 长安大学 | A kind of hot air heating apparatus and its method for heating and controlling of tandem bituminous pavement |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |