CA1237315A - Paved road surface reproducing apparatus - Google Patents
Paved road surface reproducing apparatusInfo
- Publication number
- CA1237315A CA1237315A CA000520429A CA520429A CA1237315A CA 1237315 A CA1237315 A CA 1237315A CA 000520429 A CA000520429 A CA 000520429A CA 520429 A CA520429 A CA 520429A CA 1237315 A CA1237315 A CA 1237315A
- Authority
- CA
- Canada
- Prior art keywords
- road surface
- rotor
- hopper
- truck
- screed
- 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
Links
- 239000000203 mixture Substances 0.000 claims abstract description 36
- 238000010438 heat treatment Methods 0.000 claims abstract description 34
- 239000004902 Softening Agent Substances 0.000 claims abstract description 3
- 239000006096 absorbing agent Substances 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 description 53
- 239000010426 asphalt Substances 0.000 description 41
- 239000002344 surface layer Substances 0.000 description 23
- 239000007789 gas Substances 0.000 description 19
- 238000000034 method Methods 0.000 description 11
- 230000003028 elevating effect Effects 0.000 description 10
- 238000010276 construction Methods 0.000 description 7
- 239000000654 additive Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 230000009471 action Effects 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- 206010040844 Skin exfoliation Diseases 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 239000012615 aggregate Substances 0.000 description 2
- 239000011384 asphalt concrete Substances 0.000 description 2
- 238000005056 compaction Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000004299 exfoliation Methods 0.000 description 2
- 239000011874 heated mixture Substances 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 239000002440 industrial waste Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000007480 spreading Effects 0.000 description 2
- 238000003892 spreading Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 241000885184 Scaris Species 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 210000000078 claw Anatomy 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- -1 for example Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 238000011221 initial treatment Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000003915 liquefied petroleum gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 230000002311 subsequent effect Effects 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Road Paving Machines (AREA)
Abstract
7. ABSTRACT OF THE DISCLOSURE:
The paved road surface reproducing apparatus consists of first and second self-propelled, steerable working trucks. The first truck is equipped with: a road surface heater; a pair of gas bomb tables mounted on both sides, respectively, of the truck which can be raised or lowered by lift; a hopper for receiving a bituminous mixture from outside; and a conveyor for transporting the mixture from the hopper to the rear part of the truck. The second truck is equipped with:
a hopper for receiving the bituminous mixture trans-ferred from the first truck; a conveyor for trans-porting the mixture received from the hopper to the rear part of the truck; a powdery oil-absorber scattering device; a small size road surface heater; a scarifier;
a softening agent scattering device; and a rotor equipped with a mixer having a plurality of rotors and a heating chamber; and also equipped with a first screw spreader; a first screed; a second screw spreader; and a second screed in tandem at the rear part of the truck.
The first screw spreader and the first screed are mounted on the truck to have their lower end faces to be submergible under the surface of the road.
The paved road surface reproducing apparatus consists of first and second self-propelled, steerable working trucks. The first truck is equipped with: a road surface heater; a pair of gas bomb tables mounted on both sides, respectively, of the truck which can be raised or lowered by lift; a hopper for receiving a bituminous mixture from outside; and a conveyor for transporting the mixture from the hopper to the rear part of the truck. The second truck is equipped with:
a hopper for receiving the bituminous mixture trans-ferred from the first truck; a conveyor for trans-porting the mixture received from the hopper to the rear part of the truck; a powdery oil-absorber scattering device; a small size road surface heater; a scarifier;
a softening agent scattering device; and a rotor equipped with a mixer having a plurality of rotors and a heating chamber; and also equipped with a first screw spreader; a first screed; a second screw spreader; and a second screed in tandem at the rear part of the truck.
The first screw spreader and the first screed are mounted on the truck to have their lower end faces to be submergible under the surface of the road.
Description
~237315 SPECIFICATION
1. TITLE OF THE INVENTION:
PAVED ROAD SURFACE REPRODUCING APPARATUS
1. TITLE OF THE INVENTION:
PAVED ROAD SURFACE REPRODUCING APPARATUS
2. BACKGROUND OF THE INVENTION:
(FIELD OF THE INVENTI~N) The present invention relates to a paved road surface reproducing apparatus for remedying a bitu-minous paving material body at the site.
(DESCRIPTION OF THE PRIOR ART) Ge~erally speaking, a bituminous paving ma-terial body having aged to lose its paving function is remedied for the purpose of preventing a danger to the runs of vehicles or environmental pollution of the roadsides. The remedy of the bitumini~ed road has hitherto been conducted by the method of digging the paved road to its full thickness to repave the dug road with a new material, the method of cutting away only the portion having lost the paving func-tion to repave the cut portion with a new bituminous mixture, the method of raising the ~urface of the paved road merely by applying thereonto a new bituminous mixture, or the method of executing the remedy by individually using several machines such as a road surface heater, a scari~ier, a screed or a roller. However, these remedying methods are followed by several problems that the period of time for remedy is elongated, that the public nuisance such as noises is produced, that it is _ 1 _ ~2373~5 difficult to secure places for disposing the pavement wastes forming part of industrial wastes, and that those many machines are required to be used to make the works inefficient and to raise the pavement cost.
In order to solve these problems, the present applicant has heretofore proposed a heating type bituminized road surface reproducing apparatus which has an effect that it can heat and scarify the road surace to effect the remedy by itself at the site for a short time period with inviting neither the noises and vibrations nor the industrial wastes to reproduce a paved road with economy of power and resources. Thus, in the case of the repaving method in which the bituminized road is overlaid by the bitumen, in order to transport, level, finish and tamp new bituminous mixture, a dump truck, an asphalt finisher, a roller and so on are used to raise the problems that the many machines are required to be used for individual works and that the cost for the remedy is increased. Since the new bituminous mixture has to be unloaded rom the dump truck in conformity with the relatively slow working speed of the reproducing apparatus, moreover, this apparatus involves therein the problems that the working efficiency of the dump truck and the sub-sequent standby truck is bad and that the tem-perature drop of the new bituminous mixture is ~373~;
invited to deteriorate the tamping percentage of the bituminous paving material body. In the case of overlaying the new material on the re-produced paved road at the site where the remedy is conducted at one side of the road while traffic is allowed at the other side, both the long line of those working machines including the standby dump truck or trucks and the intrusion of the dump truck having gained its turn into the working site in front of the reproducing apparatus raise problems that they remarkably obstruct the ordinary traffic and that the heated mixture and heated road surfaces decrease in temperatures. On the other hand, the aforementioned heating type bituminized road surface reproducing apparatus has ~lso a problem that it finds it difficult to adopt the remixing method in which the bituminous mixture reproduced at the site is mixed with a new one.
In accordance with the prior art, the heating type bituminized road surface reproducing apparatus is equipped: in an upper front portion of its self-pronelled body with a hopper for receiving a paving material; below the hopper with a bar feeder for feeding the paving material backward; below the center of the body with a scarifier for digging up the paved material body and a rotor for breaking into pieces the paved material dug up; and in a rear lower ~Z373~
portion of the body with a screw spreader for spreading the paving material to a predetermined width and thickness and a screed for tamping the paving material.
However, the aforementioned heating type bituminized road surface reproducing apparatus of the prior art is accompanied by the following problems when it digs up the paved material by the scarifier, breaking it up by the rotor, feeds a new paving material backward from the hopper by a bar feeder, levels the material by the screw spreader, and tamps the same by the screed.
It is customary to slope the road surface in a manner that the widthwise center of the same is raised, and, hence, there arises a difficulty that the paving material to be fed backward by the bar feeder drops in front of the screw spreader so that it flows out forward and flows sideway of the road surface before it is tamped by the screed.
This drawback is severe especially in case the roadsides are formed with side grooves so that the paved surface is dug from above the side groove frames. This is because the screed has its lower face leveled with the upper faces of the side groove frames whereas the screw spreader is positioned above the face of the screed so that the soft asphalt mixture flows foward below the screw ~L23~3~5 spreader until it flows down to the roadsides in accordance with the slope of the road surface. This out~low of the paving material to the sicle grooves makes the post-treatment difficult.
At the time of repairing operations of such a conventional paved road surface reproducing apparatus, a heating unit is separated from a scarifying/mixing unit. Therefore, the pavin~
material body once heated up to a high temperature is cooled down by the time the scarifying/mixing unit reaches the heated portions of the pavement.
In addition, because such a scarifying/mixing unit is not provided with a heating/heat-insulating means and has to conduct a mixing operation in an atmosphere at outdoor temperatures, the temperatures of the material will drop rapidly.
The temperaturas where 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 mixtures scarified should stay within a predetermined range at the time of rolling. Such average temperature generally is in a range of 110 to 140C. Further, the thickness of the surface layer to be reproduced is in a range of between 3 and 5 cm.
If the temperature of the pavement having a depth .~ 23~5 to which a scarifying operation is performed is below the softening point of asphalt, the aggrega-tes contained in the asphalt mixture are apt to be broken so that the surfaces of the aggregates to which no asphalt is coated are exposed. As a result, the compaction or tamping effect of the asphalt mixture is impaired to a large extent.
In view of the requirements that the tem-perature of the pavement having a depth to which it is to be scarified should be above the softening point of asphalt and that the average temperature of the whole scarified asphalt mixture should be within the predetermined range immediately before the start of rolling, the conventional apparatus which are not provided with heating/heat-insulating means can scarify only to half the thickness of the entire surface layer to be scarified. Consequently, it is very difficult to reproduce the pavement which has been impaired to the entire depth of the pavement.
The mixing unit of the conventional road surface layer reproducing apparatus is provided with a one-axle type rotor which makes it difficult to effect a uniform mixing of the asphalt mixture. Particularly, in case such a mixing operation for reproduction is conducted with addition of various reproducing additives and fresh asphalt mixture, there is an inclination to ~:3'73~l~
lack uniformity in the mixture. Some conventional machines are equipped with a two-axle rotor which is arranged in parallel with the advancing direction of the vehicle to eliminate the lack of uniformity in the mixture. But these machines lack a heating and heat-insulating means in addition to exposure of the scarified surfaces to atmosphere temperatures, resulting in a drop of the temperatures of the scarified surfaces. No such machines can improve the quality of the reproduced asphalt mixtures.
(FIELD OF THE INVENTI~N) The present invention relates to a paved road surface reproducing apparatus for remedying a bitu-minous paving material body at the site.
(DESCRIPTION OF THE PRIOR ART) Ge~erally speaking, a bituminous paving ma-terial body having aged to lose its paving function is remedied for the purpose of preventing a danger to the runs of vehicles or environmental pollution of the roadsides. The remedy of the bitumini~ed road has hitherto been conducted by the method of digging the paved road to its full thickness to repave the dug road with a new material, the method of cutting away only the portion having lost the paving func-tion to repave the cut portion with a new bituminous mixture, the method of raising the ~urface of the paved road merely by applying thereonto a new bituminous mixture, or the method of executing the remedy by individually using several machines such as a road surface heater, a scari~ier, a screed or a roller. However, these remedying methods are followed by several problems that the period of time for remedy is elongated, that the public nuisance such as noises is produced, that it is _ 1 _ ~2373~5 difficult to secure places for disposing the pavement wastes forming part of industrial wastes, and that those many machines are required to be used to make the works inefficient and to raise the pavement cost.
In order to solve these problems, the present applicant has heretofore proposed a heating type bituminized road surface reproducing apparatus which has an effect that it can heat and scarify the road surace to effect the remedy by itself at the site for a short time period with inviting neither the noises and vibrations nor the industrial wastes to reproduce a paved road with economy of power and resources. Thus, in the case of the repaving method in which the bituminized road is overlaid by the bitumen, in order to transport, level, finish and tamp new bituminous mixture, a dump truck, an asphalt finisher, a roller and so on are used to raise the problems that the many machines are required to be used for individual works and that the cost for the remedy is increased. Since the new bituminous mixture has to be unloaded rom the dump truck in conformity with the relatively slow working speed of the reproducing apparatus, moreover, this apparatus involves therein the problems that the working efficiency of the dump truck and the sub-sequent standby truck is bad and that the tem-perature drop of the new bituminous mixture is ~373~;
invited to deteriorate the tamping percentage of the bituminous paving material body. In the case of overlaying the new material on the re-produced paved road at the site where the remedy is conducted at one side of the road while traffic is allowed at the other side, both the long line of those working machines including the standby dump truck or trucks and the intrusion of the dump truck having gained its turn into the working site in front of the reproducing apparatus raise problems that they remarkably obstruct the ordinary traffic and that the heated mixture and heated road surfaces decrease in temperatures. On the other hand, the aforementioned heating type bituminized road surface reproducing apparatus has ~lso a problem that it finds it difficult to adopt the remixing method in which the bituminous mixture reproduced at the site is mixed with a new one.
In accordance with the prior art, the heating type bituminized road surface reproducing apparatus is equipped: in an upper front portion of its self-pronelled body with a hopper for receiving a paving material; below the hopper with a bar feeder for feeding the paving material backward; below the center of the body with a scarifier for digging up the paved material body and a rotor for breaking into pieces the paved material dug up; and in a rear lower ~Z373~
portion of the body with a screw spreader for spreading the paving material to a predetermined width and thickness and a screed for tamping the paving material.
However, the aforementioned heating type bituminized road surface reproducing apparatus of the prior art is accompanied by the following problems when it digs up the paved material by the scarifier, breaking it up by the rotor, feeds a new paving material backward from the hopper by a bar feeder, levels the material by the screw spreader, and tamps the same by the screed.
It is customary to slope the road surface in a manner that the widthwise center of the same is raised, and, hence, there arises a difficulty that the paving material to be fed backward by the bar feeder drops in front of the screw spreader so that it flows out forward and flows sideway of the road surface before it is tamped by the screed.
This drawback is severe especially in case the roadsides are formed with side grooves so that the paved surface is dug from above the side groove frames. This is because the screed has its lower face leveled with the upper faces of the side groove frames whereas the screw spreader is positioned above the face of the screed so that the soft asphalt mixture flows foward below the screw ~L23~3~5 spreader until it flows down to the roadsides in accordance with the slope of the road surface. This out~low of the paving material to the sicle grooves makes the post-treatment difficult.
At the time of repairing operations of such a conventional paved road surface reproducing apparatus, a heating unit is separated from a scarifying/mixing unit. Therefore, the pavin~
material body once heated up to a high temperature is cooled down by the time the scarifying/mixing unit reaches the heated portions of the pavement.
In addition, because such a scarifying/mixing unit is not provided with a heating/heat-insulating means and has to conduct a mixing operation in an atmosphere at outdoor temperatures, the temperatures of the material will drop rapidly.
The temperaturas where 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 mixtures scarified should stay within a predetermined range at the time of rolling. Such average temperature generally is in a range of 110 to 140C. Further, the thickness of the surface layer to be reproduced is in a range of between 3 and 5 cm.
If the temperature of the pavement having a depth .~ 23~5 to which a scarifying operation is performed is below the softening point of asphalt, the aggrega-tes contained in the asphalt mixture are apt to be broken so that the surfaces of the aggregates to which no asphalt is coated are exposed. As a result, the compaction or tamping effect of the asphalt mixture is impaired to a large extent.
In view of the requirements that the tem-perature of the pavement having a depth to which it is to be scarified should be above the softening point of asphalt and that the average temperature of the whole scarified asphalt mixture should be within the predetermined range immediately before the start of rolling, the conventional apparatus which are not provided with heating/heat-insulating means can scarify only to half the thickness of the entire surface layer to be scarified. Consequently, it is very difficult to reproduce the pavement which has been impaired to the entire depth of the pavement.
The mixing unit of the conventional road surface layer reproducing apparatus is provided with a one-axle type rotor which makes it difficult to effect a uniform mixing of the asphalt mixture. Particularly, in case such a mixing operation for reproduction is conducted with addition of various reproducing additives and fresh asphalt mixture, there is an inclination to ~:3'73~l~
lack uniformity in the mixture. Some conventional machines are equipped with a two-axle rotor which is arranged in parallel with the advancing direction of the vehicle to eliminate the lack of uniformity in the mixture. But these machines lack a heating and heat-insulating means in addition to exposure of the scarified surfaces to atmosphere temperatures, resulting in a drop of the temperatures of the scarified surfaces. No such machines can improve the quality of the reproduced asphalt mixtures.
3. SUMMARY OF THE INVENTION:
The present invention has been made in order to solve the aforementioned problems and has an object to provide a paved road surface reproducing apparatus which can execute the reproduction economically for a shor time period without bringing about any environmental pollution with little obstruction to the general traffic and little drop of the temperatures of the heated mixture and road surface and which can not only execute the so-called "reforming method" of reproducing the bituminous paving material at the site but also execute, in accordance with the causes of damaging the pavement, both the remixing method of scattering an additive by using either powderly oil-absorber scattering means for the ruts, for example, which are caused by asphalt excess for the traffic load, or liquid softening agent scattering ~%;~73~1LS
means when the asphalt has aged to form cracks and the repaving method of using a new mixture when the paved thickness is short.
Another object of the present invention is to provide a paved road surface reproducing apparatus which has its second working truck equipped with two pairs of higher and lower screw spreaders in a rear portion of the truck body.
The present invention has been achieved in view of the above-mentioned problems and is intended to provide a paved road surface reproducing apparatus which is equipped with two pairs of screw spreaders and screeds so that a primary treatment may be executed by the front one pair. More specifically, the paved road surface reproducing apparatus which is equipped with a scarifier and a rotor and is characterized, in order to solve the problems, to have its body arranged in tandem in its rear portions with a first screw spreader, a first screed, a second screw spreader, and a second screed such that they are ordered backward of the apparatus body, and such that the first screw spreader and the first screed are enabled to have their lower end faces submerged below the road surface.
According to the present invention thus con-structed, the first screw spreader and the first screed can be submerged below the road surface.
~23~3~L5 When a new paving material is to be paved after the scarifier has had its leading end submerged to dig up the road surface and after the rotor presses and stabilizes the paved surface below the upper face of the side groove, the first screw spreader primarily spreads the new paving material to a predetermined width and thickness, and the first screed primarily tamps the spreaded material to prevent the same from flowing to the roadside until the second screw spreader and the second screed secondarily completes the leveling and tamping.
Further, the present invention has been developed with an aim to prov~de a paved road surface reproducing apparatus which makes it possible to solve the problems inherent in the conventional machines, to select any given scarified depth over the entire thickness of the asphalt pavement layer, to remove lack of uniformity in mixing of the asphalt mixture, and to keep an average temperature of the entire reproducing asphalt mixture at temperature above a predetermined level.
When dense graded asphalt concrete is heated continuously for 6 minutes at 61, 000 kcal/hr/m2 by means of an infrared radiation heater exemplifying a heating method using a road surface heating unit ~373~
and employing liquefied petroleum gas (LP&) as a fuel, it has been found that the temperatures of such dense graded asphalt concrete vary in accordance with the depths thereof.
In case the road surface heating unit equipped with such a heater leads and road surface reproducing units including a rotor unit for scarifying/mixing an asphalt pavement, spreaders and screeds, said units being mounted on the underside of the vehicle body, trails, the paved road surface reproducing apparatus will have the rotor unit characteristically constructed such that it is provided with a mixing chamber defined by a supporting frame which is vertically movable through power cylinders, said mixing chamber having an opening in its lower section and a heating room in its upper section, a plurality of rotors arranged in a direction perpendicular to an advancing direction of the vehicle body in rows so as to be rotated in a direction opposite to that of adjacent one, and a heating means for heating the internal atmospheres of the heating room and mixing chamber to high temperatures above that of the open air and keeping those internal atmospheres at such high temperatures.
Preferably, the rotor unit is provided with a front rotor and rear rotor, while conical bits are ~373~L~
provided in the front rotor and flat b;ts are provided in the rear rotor.
Further, preferably, the heating means is provided with a heat-insulating plate in the upper section of the mixing chamber so as to define the heating room in which gas burners are equipped to make it possible to supply hot air.
The present invention has been made in order to solve the aforementioned problems and has an object to provide a paved road surface reproducing apparatus which can execute the reproduction economically for a shor time period without bringing about any environmental pollution with little obstruction to the general traffic and little drop of the temperatures of the heated mixture and road surface and which can not only execute the so-called "reforming method" of reproducing the bituminous paving material at the site but also execute, in accordance with the causes of damaging the pavement, both the remixing method of scattering an additive by using either powderly oil-absorber scattering means for the ruts, for example, which are caused by asphalt excess for the traffic load, or liquid softening agent scattering ~%;~73~1LS
means when the asphalt has aged to form cracks and the repaving method of using a new mixture when the paved thickness is short.
Another object of the present invention is to provide a paved road surface reproducing apparatus which has its second working truck equipped with two pairs of higher and lower screw spreaders in a rear portion of the truck body.
The present invention has been achieved in view of the above-mentioned problems and is intended to provide a paved road surface reproducing apparatus which is equipped with two pairs of screw spreaders and screeds so that a primary treatment may be executed by the front one pair. More specifically, the paved road surface reproducing apparatus which is equipped with a scarifier and a rotor and is characterized, in order to solve the problems, to have its body arranged in tandem in its rear portions with a first screw spreader, a first screed, a second screw spreader, and a second screed such that they are ordered backward of the apparatus body, and such that the first screw spreader and the first screed are enabled to have their lower end faces submerged below the road surface.
According to the present invention thus con-structed, the first screw spreader and the first screed can be submerged below the road surface.
~23~3~L5 When a new paving material is to be paved after the scarifier has had its leading end submerged to dig up the road surface and after the rotor presses and stabilizes the paved surface below the upper face of the side groove, the first screw spreader primarily spreads the new paving material to a predetermined width and thickness, and the first screed primarily tamps the spreaded material to prevent the same from flowing to the roadside until the second screw spreader and the second screed secondarily completes the leveling and tamping.
Further, the present invention has been developed with an aim to prov~de a paved road surface reproducing apparatus which makes it possible to solve the problems inherent in the conventional machines, to select any given scarified depth over the entire thickness of the asphalt pavement layer, to remove lack of uniformity in mixing of the asphalt mixture, and to keep an average temperature of the entire reproducing asphalt mixture at temperature above a predetermined level.
When dense graded asphalt concrete is heated continuously for 6 minutes at 61, 000 kcal/hr/m2 by means of an infrared radiation heater exemplifying a heating method using a road surface heating unit ~373~
and employing liquefied petroleum gas (LP&) as a fuel, it has been found that the temperatures of such dense graded asphalt concrete vary in accordance with the depths thereof.
In case the road surface heating unit equipped with such a heater leads and road surface reproducing units including a rotor unit for scarifying/mixing an asphalt pavement, spreaders and screeds, said units being mounted on the underside of the vehicle body, trails, the paved road surface reproducing apparatus will have the rotor unit characteristically constructed such that it is provided with a mixing chamber defined by a supporting frame which is vertically movable through power cylinders, said mixing chamber having an opening in its lower section and a heating room in its upper section, a plurality of rotors arranged in a direction perpendicular to an advancing direction of the vehicle body in rows so as to be rotated in a direction opposite to that of adjacent one, and a heating means for heating the internal atmospheres of the heating room and mixing chamber to high temperatures above that of the open air and keeping those internal atmospheres at such high temperatures.
Preferably, the rotor unit is provided with a front rotor and rear rotor, while conical bits are ~373~L~
provided in the front rotor and flat b;ts are provided in the rear rotor.
Further, preferably, the heating means is provided with a heat-insulating plate in the upper section of the mixing chamber so as to define the heating room in which gas burners are equipped to make it possible to supply hot air.
4. BRIEF DESCRIPTION OF THE VRAWINGS:
Fig. 1 is a side view of a paved road surface reproducing apparatus of the present invention;
Fig. 2 is a side view showing a fir~t working truck;
Fig. 3 is a top view showing the same;
Fig. 4 is an enlar~ed view showing the righthand half of Fig. 3, as viewed in the running direction;
Fig. 5 is a front view showing a lift;
Fig. 6 is a fron' view showing the state in which a gas bomb table is moved down by means of the lift;
Fig. 7 is an enlarged top plan view showing a æortion of a guide frame;
Fig. 8 is a side view showing a second working truck;
Fig. 9 is a side view of a rotor unit;
Fig. 10 is a vertically sectional front view of the rotor unit;
Fig. 11 is a plan view of a rotor portion of the rotor unit;
~2373~L5 Fig. 12 is a side view of a conical bit;
Fig. 13 is a circumferential development view of the front rotor;
Fig. 14 is a side view of a flat bit;
Fig. 15 is a front view of the flat bit;
Fig. 16 is a circumferential development view of the rear rotor; and Fig. 17 is a graph showing heating time and temperature variations of the asphalt pavement body.
Fig. 1 is a side view of a paved road surface reproducing apparatus of the present invention;
Fig. 2 is a side view showing a fir~t working truck;
Fig. 3 is a top view showing the same;
Fig. 4 is an enlar~ed view showing the righthand half of Fig. 3, as viewed in the running direction;
Fig. 5 is a front view showing a lift;
Fig. 6 is a fron' view showing the state in which a gas bomb table is moved down by means of the lift;
Fig. 7 is an enlarged top plan view showing a æortion of a guide frame;
Fig. 8 is a side view showing a second working truck;
Fig. 9 is a side view of a rotor unit;
Fig. 10 is a vertically sectional front view of the rotor unit;
Fig. 11 is a plan view of a rotor portion of the rotor unit;
~2373~L5 Fig. 12 is a side view of a conical bit;
Fig. 13 is a circumferential development view of the front rotor;
Fig. 14 is a side view of a flat bit;
Fig. 15 is a front view of the flat bit;
Fig. 16 is a circumferential development view of the rear rotor; and Fig. 17 is a graph showing heating time and temperature variations of the asphalt pavement body.
5. DESCRIPTION OF THE PREFERRED EMBODIMENTS:
The present invention will be described in the following in connection with the embodiments thereof with reference to the accompanying drawings.
The paved road surface reproducing apparatus is constructed of first and second workinq trucks 1 and 2 which are self-propelled and made steerable by engines - 20 and 21.
The first vehicle 1 is equipped at its front ~0 portion with a first hopper 3 for receiving a new bituminous mixture from a dump truck 63 or another transporting vehicle. The first hopper 3 is composed of two side plates ~6, a bar feeder 4, and the running frame 4' of the bar feeder 4. The running frame 4' has its rear end portion hinged to the body 1' of the first vehicle so that the first hopper 3 is enabled to run together with the first vehicle 1 by casters 28 borne i ~23~3~i on the bottom surface of the running frame 4'.
Indicated at reference numeral 29 are abutment rollers which are ~ixed on the leading end portion of the first hopper 3. These abutment rollers 29 are brought into abutment against the tires of the dump truck 63, when the bituminous mixture is supplied to the first hopper 3, to make constant the distance from the dump truck 63. Moreover, the first hopper 3 can be tilted by means of a cylinder 30 attached to the body 1' so that its casters 29 ma~ float apart ~rom the .road surface for convenience of transportation when the first vehicle l is to be transported, loaded, unloaded or forwarded.
The bar feeder 4 is mounted under tension from the bottom of the front portion of the first hopper 3 to above the front end portion of a first belt conveyor 5 overlying the truck body 1' and is driven by a motor 31 to convey the bituminous mixture poured from the dump truck 63 onto the first belt conveyor 5. On the other hand, the first hopper 3 has its two side plates 25 winged by a cylinder 27 to adjust the receiving and dropping speeds of the bituminous mixture supplied from the dump truck 63.
To the rear end of the bottom of the first hopper 3, there is fixed a first road surface heater 7 which is arranged in parallel with the road surface. Front wheels 51 are borne on both the sides of the truck body 1' at the back of the first hopper 3. From the lower ~.~373~
face of the body 1' at the back of the front wheels .~1, there are vertically movably suspended a second road surface heater 8, which is located in the vicinity of the longitudinal center of the body 1', by means of four cylinders 22. Other but additional heaters are removably attached to the two sides of the body of the heater having substantially the same width as that of the first vehicle 1 so that they can be widened in accordance with the paving width. Rear wheels 52 are borne on both the sides of the body 1' at the back of the additional heaters. On the other hand, a third road surface heater 9 is vertically movably suspended, while havin~ its portion 9' protruding backward of the body 1', by means of a cylinder 23 such that its protruding portion 9' can be folded, and is freely widened like the second road surface heater 8.
On the other hand, the first belt conveyor 5 is disposed to extend from below the rear end portion of the bar feeder 4 to the central portion of the body 1' whereas a second belt conveyor 6 is disposed under tension while having its leading end protruding to below the rear end portion of the first belt conveyor S
and its trailing end protruding backward of the rear end portion of the body 1'. Moreover, the second belt conveyor 6 is driven to run in a running frame 64, which is borne on the body 1' by rollers, by a drive motor 62 placed on the running frame 64, so that it can ~373~L5 be slid together with the running frame 64 and the drive motor 62 back and forth of the body 1' by a drive mechanism such as a hydraulic cylinder. In the working operations, the second belt conveyor 6 slides backward to have its rear end portion protruding, and, when the first vehicle is forwarded, the conveyor 6 slides forward to reduce its protrusion so that it is constructed convenient for movement. Moreover, those ~elt conveyors can be replaced by a single belt conveyor which is suitably sloped.
Gas bomb tables 67 are vertically movably attached through lifts 66 to the two side frames 65 of the self-propelled body 1'.
The lifts 66 are paired and attached symmetrically at a predetermined spacing in the longitudinal direction of the two side frames 65. Fig. 5 is a front elevation showing the lift 66 located at the righthand side and ahead in running direction of the self-propelled body 1', and Fig. 6 is a front elevation showing the state in which the gas bomb table 67 is dropped to the ground. Fig. 7 is an enlarged plan view of a guide frame portion.
The lift 66 has its mounting bases 66a, 66b and 66c fixed symmetrically at a predetermined spacing in the longitudinal direction of the frame 65. A lower arm 66g is hinged through a pin 66d to the outer mounting base 66a whereas an upper arm 66f is hinged through a pin 66e to the middle mounting base 66b. In ~3'73~
the middle of the middle mounting base 66b and the inner mounting base 66c, there is erected a lifting cylinder 66n which has its rod 660 directed downward.
The aforementioned upper and lower arms 66~ and 66g are formed to have a horizontaily bent shape in their front views and a vertically bent shape when their leading end portions are dropped around the pins 66d and 66e, respectively.
To the base end portion of the aforementioned lower arm 66g, there is attached to an actuating arm 66Q
which has its leading end portion connected through a pin 66m to the end of the rod 660 of the aforementioned lifting cylinder 66n so that the lower arm 66g is swung up and down by the piston action of the lifting cylinder 66n.
The upper and lower arms 66f and 66g have their leading end portions hinged in their parallel states, to a sliding member 66j through pins 66h and 66i, and said sliding member 66j is vertically slidably fitted in guide frames 66k.
Moreover, these guide frames 66k are erected at both the longitudinal end portions of the gas bomb table 67~
This gas bomb table 67 has its slim base 67a surrounded by frames 67b and 67b', the inner one 67b' of which is formed to have one half height of that of gas bomb 68. From the upper end portion of the inner ~23~73~
surrounding frame 67b', there protrudes outward an arm member 67c which is connected to the guide frames 66k erected at both the longitudinal end portions of the aforementioned base 67a.
From the upper end portion of the aforementioned inner surrounding frame 67b', moreover, there protrude a plurality of fastening levers 67e which extend in parallel with the arm member 67c and at a predetermined spacing in the longitudinal direction of the base 67a.
A thrust plate 67d is fitted on and a fastening ring 67f is screwed on the leading end portion of each of the fastening levers 67e.
What is shown in Fig. S with the construction thus far described is the state in which the gas bomb table 67 is elevated to a fixed position on the self-propelled truck body 1'. When the piston rod 660 of the lifting cylinder 66n is contracted, the leading end of the lower arm 66g is moved down together with the upper arm 66f hinged to the sliding member 66j so that the guide frame 66k and the base 67a fixed to the former are dropped to the ground in accordance with the downward movement of the sliding member 66j. At the drop stage, the thrust plate 67d is disengaged to place the gas bombs 68 and so forth on the base 67a. The thrust plate 67d is fitted on the fastening levers 67e, and the fastening ring 67f is screwed and fasented to the leading end portion of the fastening levers &7e ~L2373~1L~i;
which protrude outward from the thrust plate 67d.
Then, the gas bombs 68 and so forth are fasten~d and fixedly clamped between the inner surrounding ~rame 67b' and the thrust plate 67d. If the piston rod 660 of the lifting cylinder 66n is then extended, the gas bombs 68 and so forth can be lifted and fixed in the state shown in Fig. 5.
The aforementioned lifting cylinder 66n may be of either hydraulic or pneumatic type.
The aforementioned upper and lower arms 66f and 66g are hinged to the sliding member 66j but may be directly hinged to the guide frame 66k. With the sliding member 66j, incidentally, the base 67a can be dropped without any trouble even if its drop position is higher or lower than the general road surface.
In Fig. 8, the second working truck which con-stitutes the road surface reproducing apparatus 2 is equipped with drive wheels 82 and smaller front wheels 83 borne on two axles, both wheels 83 and 83 of which can be steered by means of a steering wheel 84a.
A truck body 2' has its front upper portion sloped downward to the front and carries a hopper 85 and a slidable bar feeder 86 of known type, which extends from below said hopper 85 to the back of the body 2' to feed backward the paving material received from the hopper 85 up to a position ahead of a second screed 93.
Below the body 2', there are disposed between the - ~8 -~373~S
front wheels 83 and the drive wheels 82 a heater 87, a scarifier 88, and a rotor 89 which are arranged in the order recited backward. The heater 87 is of the infrared ray type using a gas burner to heat the road surface paved with the asphalt. The temperature of this heating is suitably varied in accordance with the temperature of the open air and asphalt.
Reference numeral 87a indicates gas bombs for supplying a gas to a gas heater.
The aforementioned scarifier 88 has pawls 8~a which are arranged zigzag three in number in its front-and-back direction and two or more in number at a predetermined spacing in the lateral direction in a protruding manner. Their tips can be submerged below the -oad surface to dig up the same. During the non-operation, however, the scarifier 88 is constructed such that it can as a whole be lifted by means of a cylinder 88b, whereby a submerging of the pawls 88a into the paved surface and a moving, in this state, of the vehicle body 2' enable a scarifying of the paved surface layer.
In the present invention, the provision of the scarifier is not always needed because the paved surface layer can sufficiently be scarified by the succeeding rotor unit.
As shown in Figs. 9 and 10, the rotor unit 89 is shaped into a cage-like form defined by a supporting - 19. -3~S
frame llO provided with an opening 11Oa in itslower section. The supporting frame 11`0 is providèd with a middle ceiling 11Ob in an expanding manner inside the same to define a mixing chamber 1 l 1 in its lower portion. In an upper section of the mixing chamber 111 is defined a heating room 112 with a help of a heat-insulating plate 112a which takes an arcuate form in its side view as shown in Fig. 9 to make it possible for the plate to be slidably contacted by the asphalt mixture taken up by the rotation of the rotors of the rotor unit 89 in the upper portions of the rotors, and is opened into vent holes 11 2b both in front and rear ends of the heat-insulating plate.
In an upper portion of the heating room 112, there is provided a projecting portion 112c which projects upward from the middle ceiling 11Ob, extends in a direction perpendicular to the advancing direction of the vehicle body, and has a double-walled structure in which an inner wall is constructed of a heat-resistant material made o aluminum plates and a hollow portion batween the walls is packed with a heat insulator 112d.
Below the projecting portion 112c is provided a heater 113 constructed of gas burners, the flames of which are directed downward. A pipe t13a of the heater 113 is connected to the gas bomb 87a through a hose (not shown) In an upper portion of the heater 113, there is provided 3L~373~
a blower nozzle 114 in a longitudinal direction of the heater 113. The blower nozzle 114 is con-nected through a duct 11 4a to a blower 11 4b pro-vided in an upper portion of the middle ceiling 11Ob.
In the mixing chamber 111 are provided a plurality of rotors 115, 116 ~two units are shown in the drawings) which are arranged in parallel with each other in a direction perpendicular to the advancing direction of the vehicle body.
The rotors 115 and 116 have their axles 11 Sa and 116a, respectively. Both ends of each of the axles 115a and 116a extend outward from the supporting frame 110 and are supported by bearings 117 and 118, while one of these ends is provided with a sprocket 118a. Above the rotors 115 and 116 and in an upper portion of the middle ceiling 11Ob, there are provided hydraulic motors 119 and 120, output shafts 119a and 120a of which are provided with sprockets 120b. A chain 120c runs around the sprockets 118a and 120b. In the drawings, the reference numeral 120d denotes a chain cover.
Couplers 121 are fixed to the other ends (which extend outwards from each bearing 117) of the axles 11Sa, 116a of the rotors 115, 116, i.e., to the leftward ends of the axles 11Sa and 116a as shown in leftward portions of Figs. 10 and 11.
~.
~23~
The couplers 121 is provided with a coupling hole 12.1a.in its.end face so as to receive an axle of a rotor for width-widening use. Fig. 11 shows a condition in which such a rotor unit 99 for width-widening use is con-nected to the rotor unit 89 of the paved road surface reproducing apparatus of the present invention.
The rotor unit 99 ~or width-widening use has the same construction as that of the rotor unit 89, so that its parts are denoted by the same reference numerals as those employed in the above description of the rotor unit 89. The rotor unit 99 is connected to the rotor unit 89 by connecting axles 99a and 99b to the couplers 121 and the supporting frames 110 are connected to each other through coupling plates 122 in a fixing manner. Th~ rotor unit 99 for width-widening use is employed as an auxiliary unit for the rotor unit 89.
As shown in Fig. 12, on the circumferential surface of each of drums llSb of front rotors 115 of the rotor units 89 and 99, there are provided a plurality of conical bits 123 so as to have their tip ends directed in a direction indicated by arro~ Z, i.e., in a rotational direction of the drum 115b. Fig.13 is a development view of ~:373~5 the circumferential surfaces of the drum 11 5b, the conical bits 123 are so arranged in an interspersing manner as indicated by black spots that the pavemnet surface layers are continuously scarified as shown in thin longitudinal lines when the drum 115b is rotated.
As shown in Fig. 12, the fixing mount 123a of the conical bit 123 stated above is fixed to the circumferential surface of the drum 11Sb by welding. A shaft portion 123c is inserted into a fitting hole 123b in the fixing mount 123a with a cylindrical spring 123d around the shaft portion 123c. A stopper 123e is threadably fixed to the base end face of the shaft portion 123c. In the drawings: the reference numeral 123f denotes a mount base; and 123g denotes an annular stopper formed on the inner circumferential surface of the fitting hole 123b in a projecting manner.
The above construction allows a swinging operation of the conical bit. A mount base 123f worn out can be replaced with a new one.
As shown in Figs. 14 and 15, on the circum-ferential surface of a drum 116b of the rear rotor 116, there are provided a plurality of flat bits 124 at the positions shown by black spots in Fig. 16 which shows a circumferential development view of 23~73~5 the drum 116b. The rear rotor 116 is rotated in a direction opposite to that of the front rotor 115, so that a tip end of the flat bit 124 is directed in a direction opposite to that of the conical bit 123. In Fig. 14; the reference numeral 124a denotes a fixing mount; 124b a fitting hole; 124c a shaft portion; and 124d a nut.
As shown in Fig. 15, the flat bit 124 is lO so wide that the amount of the asphalt mixture raked up is large. Althoud the wide surface of the flat bit 124 is fixed so as to be faced to the rotational direction of the drum 116b, it is also possible to arrange the surface of the falt bit 124 slantly to the rotational direction of the drum 116b, so that the pavement materials raked up can be transferred to the trans~rerse direction like a scrw conveyor.
Because the rotor unit 89 is assembled as 20 a unit as stated above, the rotor unit 89 can be extended in width by means of an addition of another rotor as shown in Fig. 11~
As shown in Figs. 9 and 10, in an upper front and rear portions of the supporting frame 110 of the rotor unit 89, there are horizontally provided suspension elements 125 in a direction perpendicular to the advancing direction of ~:373~
the vehicle body.
On the other hand, in the middle lower portion of the vehicle body 2', an elevating frame 126 is provided so as to be suspended from the vehicle body 2' through power cylinders 126a. The elevating frame 126 is guided with a front and a rear elevating guide 126c which are suspended from the vehicle body 2', so that the elevating frame 126 is moved up and down as the piston rods 126b of the power cylinders 126a are moved in and out.
In the front and rear lower portions of the elevating frame 126, guide rails 126d having L-shaped cross sections are provided. The suspension elements 125 of the rotor unit 89 are suspended from the guide rails 126d to make it possible to slidably guide the suspension elements 125 laterally relative to the vehicle body 2'. In an upper portion of the elevating frame 126 is provided a power cylinder 126e a piston rod 126f of which is laterally and out-wardly directed ~rightward in Fig. 10). A fore-most end portion of the piston rod 126f is pivotally connected to a bracket portion 126g mounted on the upper portion of the supporting frame 110, to make it possible that the rotor unit 89 is laterally moved along the guide rails ~2~73~5 126d through an actuation of the power cylinder 126e.
Namely, in Fig. 10, when the rotor unit 89 is moved rightward from a width center of the elevating frame 126, it is possible to suspend a right half of the rotor unit 99 for width-widening use positioned on the left side in Fig. 11 from the elevating frame 26 to make it possible that the width of the rotor unit 89 is doubled.
Of couse, it is also possible to project the rotor unit 99 entirely laterally from the vehicle body 2' while the rotor unit 89 is positioned entirely under the vehicle body 2'.
The elevating frame 126 adjusts penetrating depths of the bits of the rotor unit 89 into the pavement body, while the elevating frame 126 lifts the rotor unit 89 from the road surface to be carried by the vehicle body 2' when the rotor unit is out of service.
In Fig. 9, the reference numeral 127 denotes an additive injection nozzle. In the operation, an opening/closing lid plate 11 Oc is opened and through a window hole 11Od the additives, for example, asphalt softeners, stabilizing agents and other necessary additives are injected into the mixing chamber 111.
In a rear portion of the supporting frame 110 ~L%373~
is provided a hood 128 which prevents the blocks of the scarified pavement surface layers from running off and evens the surface of the scarified pavement materials~ As shown in Fig. 9, the hood 128 is constructed of a flat plate which is substantially perpendicular and pivotally connected in its upper portion to the supporting frame 110 while pivotally connected in its lower back portion to a lower end portion of the piston rod of a power cylinder 128a which is pivotally mounted on the supporting frame 110, to make it possible that the lower portion of the hood 128 is swingably moved up and down through the actuation of the power cylinder 128a.
In a rear portion of the vehicle body 2' behind the drive wheels 82 thereof, there are provided in a front-to-rear sequence: a first screw spr~ader 90;
a first screed 91; a second screw spreader 92; and a second screed 93.
The first screw spreader 90 is constructed of two screw spreader units which are provided in each side of the vehicle body 2' and arranged in series in a direction perpendicular to th~ advancing direc-tion of the vehicle body 2' so as 'o be driven at their outer ends, to make it possible that these two screw spreader units are lifted in a central portion relative to the width of the vehicle body ~2373~
while lowered at their outer ends in each side relative to the width of the vehicle body 2', whereby the lower surfaces of the spreader units can be placed in a level below the road surface. The first screw spreader 90 can be l fted by a power cylinder 129a when it is out of service. In the operation, the blocks of the asphalt pavement surface layers having been scarified by the scarifier 88 are further scarified and screeded by the rotor unit 89. Onto the road surface layers thus screeded are fed the pavement materials through a bar feeder 86. The pavement materials drop on the road surface layers and are temporarily screeded to a certain width so as to be more deposited in a central portion in width of the road.
The first screed 91 is fixed to a rear portion of an arm 91a having a substantially inverted U-shaped form in its side view as shown in Fig.8. The arm 91a, the front end of which is fixed to the vehicle body 2' via a power cylinder 91b, is mounted in its rear end portion on the vehicle body 2' via a power cylinder 9lc in a manner that its height can be increased or decreased as desired by actuation of the cylinder 91b, 91c.
373~5 The first screed 91 is equip~ed with a heater 91d inside the same. The heater 91d can heat the entire first screed 91 which is further equipped with wideners (not shown) in its opposite side portion in a manner that they can be advanced toward, or retreated from, the outside of the vehicle body 2' so as to increase or decrease the width of the screed 91. T~e wideners have their outer end portions sloped downward as required.
The first screed 91 performs a primary com-paction of the pavement body.
The second screw spreader 92 has the same construction as that of the first screw spreader 90 except that a setting level of the second screw spreader 92 is higher than the road surface level.
The level setting is adjusted through the actuation of the power cylinder 92a.
The second screed 93 is a conventional means equipped in a conventional manner. The reference numeral 93a denotes a power cylinder for adjusting the height of the second screed 93 and the reference numeral 93b denotes an adjusting handle.
In Fig. 8: the reference numeral 94 denotes a pump for feeding a pressurized fluid to each of the power cylinders and drive motors, and 95 denotes a control panel for controlling each of the units.
~23~3~i In the operation, the paved surface reproducing apparatus 1 of the present invention works as follows:
A description will be made as to a partial surface layer reproducing work for the case where cracks, exfoliations and the like defects are pro-duced in the surface layer of the asphalt pavement.
On a work site, in a state wherein the hopper 85 is filled with the asphalt mixture, the road surface layer is heated by the heater 87. In the operation, it is necessary to heat the asphalt ma-terial to the temperature at which it is softened into the depth of S cm or more below the road surface, so that a far infrared heater is employed as a heater to make it possible for the heat to penetrate the asphalt material deep below the road surfaces. Since it takes a certain time to transmit the heat through the pavement material, it is also possible to heat the pavement material beforehand by means of another road surface heating machine for a predetermined period of time prior to the scarification with the scarifier 88. The time is determined through calculations on the basis of a scarifying depth of the pavement materials, heat conductivities of the pavement materials and the temperature of the opan air. In this case, the heater ~7`is -employed to keep the temperatures of the heated pavement materials 3~
from drop.
The vehicle body is advanced by drlving the drive wheels 82 at a time when the pavement ma-terials are sufficiently heated, while the scarifier 88 and the bits 123 and 124 of the rotor unit 89 are lowered to penetrate into the pavement materials to a certain depth below the road surface. For example, when the claws 88a of the scarifier 88 are lowered to penetrate into the pavement materials by a depth of 5 cm below the road surface, it is possible to scarify the pavement surface layers to the depth of 5 cm below the road surface.
In case the conical bits 123 of the front rotor 115 of the rotor unit 89 are set so as to be lowered to penetrate into the pavement surface layers by the depth of 5 cm below the road surface while the flat bits 124 of the rear rotor 116 are set so as to be lowered to penetrate into the pave-ment surface layers by the depth of 4 cm below the road surface, it is possible to crash and mix the road surface layer materials having been scarified by the scarifier 88 by the use of the front rotor 115 and further to mix and sufficiently knead the road surface layer materials by means of the flat bits 124 of the rear rotor 116.
When the heating room 112 is heated beforehand by the heater 113 and hot air is fed from the blower 73~5 nozzle 114 into the heating room 112 to neat the atmosphere inside the same to temperatures of 120 to 350C, it is possible to heat the heat-insulating plate 112a and to keep the atmosphere inside the mixing chamber 111, at a temperature remarkably higher than that of the open air so that the rotors 115 and 116 are also kept at a high temperature.
Consequently, it is possible to scarify and knead the asphalt pavement surface layer materials by the use of the rotors 115 and 116 in the mixing chamber 111 so that the blocks of the pavement surface layer materials are heated by the high-temperature atmosphere of the mixing chamber 111, the temperatures of the heated rotors 115 and 116 and the heat-exchanging effect when slide-contacted with the heat-insulating plate 11 2a to make it possible that the asphalt pavement surface layer materials are sufficiently kneaded. In this case, the asphalt pavement surface layer materials are further heated in the mixing chamber 111 so as to increase its temperature by an amount of 10 to 30C.
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 the injection nozzle 127 into the mixing chamber 111.
~23731S
According to the advance of the vehicle body 2', new pavement materials lin this case, asphalt compounds) received in the hopper 85 are transferred rearward through the bar feeder 86 and drops onto the pavement before the second screw spreader 92 which evens the new pavement materials thus fed at a certain level, and there-after, the succeeding second screed 93 screeds the pavement materials.
The first screw spreader 90 and the first screed 91 perform screedin~ and compacting of the pavement materials in a level below the road surface, while the second screw spreader 92 and the second screed 93 perform a finish screeding and compacting of the pavement materials.
As a result, it is possible to reproduce the pavement having been damaged by cracks, exfoliations and the like defects over its thickness of 5 cm below the road surface.
The present invention is not limited only to the above construction. Namely, though in the above construction, two units of the rotors 115 and 116 are employed, it is also possible to employ three, four or more units of the rotors 115 and 116 in the paved road surface reproducing apparatus of the present invention~ It is also possible to employ other configurations of the rotors 115 and ~L~373~5 116 and other rotational directions and speeds thereof.
It is possible to replace the rotor unit 89 with other unit, for example such as a rotor unit having a large width by disconnecting the piston rod 126f and the bracket portion 126g. Further, it is also possible to replace the rotors 115 and 116 themselves by other suitably shaped rotors.
The motors are not limited only to the hydraulic type, and any electric heating system can be employed in the heater.
In the first working truck of the present invention, as has been described hereinbefore, the gas bomb tables are attached to the self-propelled truck through the lift so that they can be mounted or demounted by the action of the lift. As a result, the gas bomb or bombs can be simply and efficiently replaced even at the site where no crane is installed.
With the construction thus far described, the second working truck has the following excellent effects:
(a) In case the paved surface is dug deeper than the upper faces of the side grooves or the like and is additionally paved with the new paving ma-terial, the first screed can be dropped to a lower position than the road surface so that it can prevent ~:3~731~i the pavin~ material from flowing out forward.
(b) The paving material having flown foward below the first screed, if any, is prevented from flowing toward the roadsides by the action of the first screw spreader so that it can be primarily spreaded to the predetermined width and thickness.
(c) The first screw spreader is of the two-side drive type so that its one side can be driven in case the remedy is conducted at ona side from the widthwise center of the road.
(d) The first screed is dropped to a lower level than the road surface so that the primary tamping can be executed at the accordingly low level in case the paving material is spread and tamped thick. This makes it possible to increase the spreading and tamping speeds.
(e) If the rotor is raised, the paved surface can be dug up by the scarifier and broken up and spread by the first screw spreader until it can be ~amped and stabilized by the ~irst screed.
(f) The first screed has the built-in heater for heating the primarily tamped surface so that no trouble arises in the adhesiveness between the primarily tamped surface and -the secondarily tamped layer.
(g) The present apparatus of the present invention ~373:~
has both the functions of the paved road surface reproducing means and the asphalt finisher so that it can efficiently remedy the rutted and/or separated surface of the road paved with the asphalt.
(h) Since the rotor unit is provided with a plurality of rotors, it is possible to uniformly scarify, knead and even or spread the pavement materials; And, (i) Since the rotor unit is equipped with the heating means, it .is possible, even when the open air is at low temperature, to keep as it is, or raising, the temperature of the pavement materials thus scarified, to maintain the degree to which the asphalt material has been softened, thereby enabling the material to be uniformly kneaded and spread or evened.
The present invention will be described in the following in connection with the embodiments thereof with reference to the accompanying drawings.
The paved road surface reproducing apparatus is constructed of first and second workinq trucks 1 and 2 which are self-propelled and made steerable by engines - 20 and 21.
The first vehicle 1 is equipped at its front ~0 portion with a first hopper 3 for receiving a new bituminous mixture from a dump truck 63 or another transporting vehicle. The first hopper 3 is composed of two side plates ~6, a bar feeder 4, and the running frame 4' of the bar feeder 4. The running frame 4' has its rear end portion hinged to the body 1' of the first vehicle so that the first hopper 3 is enabled to run together with the first vehicle 1 by casters 28 borne i ~23~3~i on the bottom surface of the running frame 4'.
Indicated at reference numeral 29 are abutment rollers which are ~ixed on the leading end portion of the first hopper 3. These abutment rollers 29 are brought into abutment against the tires of the dump truck 63, when the bituminous mixture is supplied to the first hopper 3, to make constant the distance from the dump truck 63. Moreover, the first hopper 3 can be tilted by means of a cylinder 30 attached to the body 1' so that its casters 29 ma~ float apart ~rom the .road surface for convenience of transportation when the first vehicle l is to be transported, loaded, unloaded or forwarded.
The bar feeder 4 is mounted under tension from the bottom of the front portion of the first hopper 3 to above the front end portion of a first belt conveyor 5 overlying the truck body 1' and is driven by a motor 31 to convey the bituminous mixture poured from the dump truck 63 onto the first belt conveyor 5. On the other hand, the first hopper 3 has its two side plates 25 winged by a cylinder 27 to adjust the receiving and dropping speeds of the bituminous mixture supplied from the dump truck 63.
To the rear end of the bottom of the first hopper 3, there is fixed a first road surface heater 7 which is arranged in parallel with the road surface. Front wheels 51 are borne on both the sides of the truck body 1' at the back of the first hopper 3. From the lower ~.~373~
face of the body 1' at the back of the front wheels .~1, there are vertically movably suspended a second road surface heater 8, which is located in the vicinity of the longitudinal center of the body 1', by means of four cylinders 22. Other but additional heaters are removably attached to the two sides of the body of the heater having substantially the same width as that of the first vehicle 1 so that they can be widened in accordance with the paving width. Rear wheels 52 are borne on both the sides of the body 1' at the back of the additional heaters. On the other hand, a third road surface heater 9 is vertically movably suspended, while havin~ its portion 9' protruding backward of the body 1', by means of a cylinder 23 such that its protruding portion 9' can be folded, and is freely widened like the second road surface heater 8.
On the other hand, the first belt conveyor 5 is disposed to extend from below the rear end portion of the bar feeder 4 to the central portion of the body 1' whereas a second belt conveyor 6 is disposed under tension while having its leading end protruding to below the rear end portion of the first belt conveyor S
and its trailing end protruding backward of the rear end portion of the body 1'. Moreover, the second belt conveyor 6 is driven to run in a running frame 64, which is borne on the body 1' by rollers, by a drive motor 62 placed on the running frame 64, so that it can ~373~L5 be slid together with the running frame 64 and the drive motor 62 back and forth of the body 1' by a drive mechanism such as a hydraulic cylinder. In the working operations, the second belt conveyor 6 slides backward to have its rear end portion protruding, and, when the first vehicle is forwarded, the conveyor 6 slides forward to reduce its protrusion so that it is constructed convenient for movement. Moreover, those ~elt conveyors can be replaced by a single belt conveyor which is suitably sloped.
Gas bomb tables 67 are vertically movably attached through lifts 66 to the two side frames 65 of the self-propelled body 1'.
The lifts 66 are paired and attached symmetrically at a predetermined spacing in the longitudinal direction of the two side frames 65. Fig. 5 is a front elevation showing the lift 66 located at the righthand side and ahead in running direction of the self-propelled body 1', and Fig. 6 is a front elevation showing the state in which the gas bomb table 67 is dropped to the ground. Fig. 7 is an enlarged plan view of a guide frame portion.
The lift 66 has its mounting bases 66a, 66b and 66c fixed symmetrically at a predetermined spacing in the longitudinal direction of the frame 65. A lower arm 66g is hinged through a pin 66d to the outer mounting base 66a whereas an upper arm 66f is hinged through a pin 66e to the middle mounting base 66b. In ~3'73~
the middle of the middle mounting base 66b and the inner mounting base 66c, there is erected a lifting cylinder 66n which has its rod 660 directed downward.
The aforementioned upper and lower arms 66~ and 66g are formed to have a horizontaily bent shape in their front views and a vertically bent shape when their leading end portions are dropped around the pins 66d and 66e, respectively.
To the base end portion of the aforementioned lower arm 66g, there is attached to an actuating arm 66Q
which has its leading end portion connected through a pin 66m to the end of the rod 660 of the aforementioned lifting cylinder 66n so that the lower arm 66g is swung up and down by the piston action of the lifting cylinder 66n.
The upper and lower arms 66f and 66g have their leading end portions hinged in their parallel states, to a sliding member 66j through pins 66h and 66i, and said sliding member 66j is vertically slidably fitted in guide frames 66k.
Moreover, these guide frames 66k are erected at both the longitudinal end portions of the gas bomb table 67~
This gas bomb table 67 has its slim base 67a surrounded by frames 67b and 67b', the inner one 67b' of which is formed to have one half height of that of gas bomb 68. From the upper end portion of the inner ~23~73~
surrounding frame 67b', there protrudes outward an arm member 67c which is connected to the guide frames 66k erected at both the longitudinal end portions of the aforementioned base 67a.
From the upper end portion of the aforementioned inner surrounding frame 67b', moreover, there protrude a plurality of fastening levers 67e which extend in parallel with the arm member 67c and at a predetermined spacing in the longitudinal direction of the base 67a.
A thrust plate 67d is fitted on and a fastening ring 67f is screwed on the leading end portion of each of the fastening levers 67e.
What is shown in Fig. S with the construction thus far described is the state in which the gas bomb table 67 is elevated to a fixed position on the self-propelled truck body 1'. When the piston rod 660 of the lifting cylinder 66n is contracted, the leading end of the lower arm 66g is moved down together with the upper arm 66f hinged to the sliding member 66j so that the guide frame 66k and the base 67a fixed to the former are dropped to the ground in accordance with the downward movement of the sliding member 66j. At the drop stage, the thrust plate 67d is disengaged to place the gas bombs 68 and so forth on the base 67a. The thrust plate 67d is fitted on the fastening levers 67e, and the fastening ring 67f is screwed and fasented to the leading end portion of the fastening levers &7e ~L2373~1L~i;
which protrude outward from the thrust plate 67d.
Then, the gas bombs 68 and so forth are fasten~d and fixedly clamped between the inner surrounding ~rame 67b' and the thrust plate 67d. If the piston rod 660 of the lifting cylinder 66n is then extended, the gas bombs 68 and so forth can be lifted and fixed in the state shown in Fig. 5.
The aforementioned lifting cylinder 66n may be of either hydraulic or pneumatic type.
The aforementioned upper and lower arms 66f and 66g are hinged to the sliding member 66j but may be directly hinged to the guide frame 66k. With the sliding member 66j, incidentally, the base 67a can be dropped without any trouble even if its drop position is higher or lower than the general road surface.
In Fig. 8, the second working truck which con-stitutes the road surface reproducing apparatus 2 is equipped with drive wheels 82 and smaller front wheels 83 borne on two axles, both wheels 83 and 83 of which can be steered by means of a steering wheel 84a.
A truck body 2' has its front upper portion sloped downward to the front and carries a hopper 85 and a slidable bar feeder 86 of known type, which extends from below said hopper 85 to the back of the body 2' to feed backward the paving material received from the hopper 85 up to a position ahead of a second screed 93.
Below the body 2', there are disposed between the - ~8 -~373~S
front wheels 83 and the drive wheels 82 a heater 87, a scarifier 88, and a rotor 89 which are arranged in the order recited backward. The heater 87 is of the infrared ray type using a gas burner to heat the road surface paved with the asphalt. The temperature of this heating is suitably varied in accordance with the temperature of the open air and asphalt.
Reference numeral 87a indicates gas bombs for supplying a gas to a gas heater.
The aforementioned scarifier 88 has pawls 8~a which are arranged zigzag three in number in its front-and-back direction and two or more in number at a predetermined spacing in the lateral direction in a protruding manner. Their tips can be submerged below the -oad surface to dig up the same. During the non-operation, however, the scarifier 88 is constructed such that it can as a whole be lifted by means of a cylinder 88b, whereby a submerging of the pawls 88a into the paved surface and a moving, in this state, of the vehicle body 2' enable a scarifying of the paved surface layer.
In the present invention, the provision of the scarifier is not always needed because the paved surface layer can sufficiently be scarified by the succeeding rotor unit.
As shown in Figs. 9 and 10, the rotor unit 89 is shaped into a cage-like form defined by a supporting - 19. -3~S
frame llO provided with an opening 11Oa in itslower section. The supporting frame 11`0 is providèd with a middle ceiling 11Ob in an expanding manner inside the same to define a mixing chamber 1 l 1 in its lower portion. In an upper section of the mixing chamber 111 is defined a heating room 112 with a help of a heat-insulating plate 112a which takes an arcuate form in its side view as shown in Fig. 9 to make it possible for the plate to be slidably contacted by the asphalt mixture taken up by the rotation of the rotors of the rotor unit 89 in the upper portions of the rotors, and is opened into vent holes 11 2b both in front and rear ends of the heat-insulating plate.
In an upper portion of the heating room 112, there is provided a projecting portion 112c which projects upward from the middle ceiling 11Ob, extends in a direction perpendicular to the advancing direction of the vehicle body, and has a double-walled structure in which an inner wall is constructed of a heat-resistant material made o aluminum plates and a hollow portion batween the walls is packed with a heat insulator 112d.
Below the projecting portion 112c is provided a heater 113 constructed of gas burners, the flames of which are directed downward. A pipe t13a of the heater 113 is connected to the gas bomb 87a through a hose (not shown) In an upper portion of the heater 113, there is provided 3L~373~
a blower nozzle 114 in a longitudinal direction of the heater 113. The blower nozzle 114 is con-nected through a duct 11 4a to a blower 11 4b pro-vided in an upper portion of the middle ceiling 11Ob.
In the mixing chamber 111 are provided a plurality of rotors 115, 116 ~two units are shown in the drawings) which are arranged in parallel with each other in a direction perpendicular to the advancing direction of the vehicle body.
The rotors 115 and 116 have their axles 11 Sa and 116a, respectively. Both ends of each of the axles 115a and 116a extend outward from the supporting frame 110 and are supported by bearings 117 and 118, while one of these ends is provided with a sprocket 118a. Above the rotors 115 and 116 and in an upper portion of the middle ceiling 11Ob, there are provided hydraulic motors 119 and 120, output shafts 119a and 120a of which are provided with sprockets 120b. A chain 120c runs around the sprockets 118a and 120b. In the drawings, the reference numeral 120d denotes a chain cover.
Couplers 121 are fixed to the other ends (which extend outwards from each bearing 117) of the axles 11Sa, 116a of the rotors 115, 116, i.e., to the leftward ends of the axles 11Sa and 116a as shown in leftward portions of Figs. 10 and 11.
~.
~23~
The couplers 121 is provided with a coupling hole 12.1a.in its.end face so as to receive an axle of a rotor for width-widening use. Fig. 11 shows a condition in which such a rotor unit 99 for width-widening use is con-nected to the rotor unit 89 of the paved road surface reproducing apparatus of the present invention.
The rotor unit 99 ~or width-widening use has the same construction as that of the rotor unit 89, so that its parts are denoted by the same reference numerals as those employed in the above description of the rotor unit 89. The rotor unit 99 is connected to the rotor unit 89 by connecting axles 99a and 99b to the couplers 121 and the supporting frames 110 are connected to each other through coupling plates 122 in a fixing manner. Th~ rotor unit 99 for width-widening use is employed as an auxiliary unit for the rotor unit 89.
As shown in Fig. 12, on the circumferential surface of each of drums llSb of front rotors 115 of the rotor units 89 and 99, there are provided a plurality of conical bits 123 so as to have their tip ends directed in a direction indicated by arro~ Z, i.e., in a rotational direction of the drum 115b. Fig.13 is a development view of ~:373~5 the circumferential surfaces of the drum 11 5b, the conical bits 123 are so arranged in an interspersing manner as indicated by black spots that the pavemnet surface layers are continuously scarified as shown in thin longitudinal lines when the drum 115b is rotated.
As shown in Fig. 12, the fixing mount 123a of the conical bit 123 stated above is fixed to the circumferential surface of the drum 11Sb by welding. A shaft portion 123c is inserted into a fitting hole 123b in the fixing mount 123a with a cylindrical spring 123d around the shaft portion 123c. A stopper 123e is threadably fixed to the base end face of the shaft portion 123c. In the drawings: the reference numeral 123f denotes a mount base; and 123g denotes an annular stopper formed on the inner circumferential surface of the fitting hole 123b in a projecting manner.
The above construction allows a swinging operation of the conical bit. A mount base 123f worn out can be replaced with a new one.
As shown in Figs. 14 and 15, on the circum-ferential surface of a drum 116b of the rear rotor 116, there are provided a plurality of flat bits 124 at the positions shown by black spots in Fig. 16 which shows a circumferential development view of 23~73~5 the drum 116b. The rear rotor 116 is rotated in a direction opposite to that of the front rotor 115, so that a tip end of the flat bit 124 is directed in a direction opposite to that of the conical bit 123. In Fig. 14; the reference numeral 124a denotes a fixing mount; 124b a fitting hole; 124c a shaft portion; and 124d a nut.
As shown in Fig. 15, the flat bit 124 is lO so wide that the amount of the asphalt mixture raked up is large. Althoud the wide surface of the flat bit 124 is fixed so as to be faced to the rotational direction of the drum 116b, it is also possible to arrange the surface of the falt bit 124 slantly to the rotational direction of the drum 116b, so that the pavement materials raked up can be transferred to the trans~rerse direction like a scrw conveyor.
Because the rotor unit 89 is assembled as 20 a unit as stated above, the rotor unit 89 can be extended in width by means of an addition of another rotor as shown in Fig. 11~
As shown in Figs. 9 and 10, in an upper front and rear portions of the supporting frame 110 of the rotor unit 89, there are horizontally provided suspension elements 125 in a direction perpendicular to the advancing direction of ~:373~
the vehicle body.
On the other hand, in the middle lower portion of the vehicle body 2', an elevating frame 126 is provided so as to be suspended from the vehicle body 2' through power cylinders 126a. The elevating frame 126 is guided with a front and a rear elevating guide 126c which are suspended from the vehicle body 2', so that the elevating frame 126 is moved up and down as the piston rods 126b of the power cylinders 126a are moved in and out.
In the front and rear lower portions of the elevating frame 126, guide rails 126d having L-shaped cross sections are provided. The suspension elements 125 of the rotor unit 89 are suspended from the guide rails 126d to make it possible to slidably guide the suspension elements 125 laterally relative to the vehicle body 2'. In an upper portion of the elevating frame 126 is provided a power cylinder 126e a piston rod 126f of which is laterally and out-wardly directed ~rightward in Fig. 10). A fore-most end portion of the piston rod 126f is pivotally connected to a bracket portion 126g mounted on the upper portion of the supporting frame 110, to make it possible that the rotor unit 89 is laterally moved along the guide rails ~2~73~5 126d through an actuation of the power cylinder 126e.
Namely, in Fig. 10, when the rotor unit 89 is moved rightward from a width center of the elevating frame 126, it is possible to suspend a right half of the rotor unit 99 for width-widening use positioned on the left side in Fig. 11 from the elevating frame 26 to make it possible that the width of the rotor unit 89 is doubled.
Of couse, it is also possible to project the rotor unit 99 entirely laterally from the vehicle body 2' while the rotor unit 89 is positioned entirely under the vehicle body 2'.
The elevating frame 126 adjusts penetrating depths of the bits of the rotor unit 89 into the pavement body, while the elevating frame 126 lifts the rotor unit 89 from the road surface to be carried by the vehicle body 2' when the rotor unit is out of service.
In Fig. 9, the reference numeral 127 denotes an additive injection nozzle. In the operation, an opening/closing lid plate 11 Oc is opened and through a window hole 11Od the additives, for example, asphalt softeners, stabilizing agents and other necessary additives are injected into the mixing chamber 111.
In a rear portion of the supporting frame 110 ~L%373~
is provided a hood 128 which prevents the blocks of the scarified pavement surface layers from running off and evens the surface of the scarified pavement materials~ As shown in Fig. 9, the hood 128 is constructed of a flat plate which is substantially perpendicular and pivotally connected in its upper portion to the supporting frame 110 while pivotally connected in its lower back portion to a lower end portion of the piston rod of a power cylinder 128a which is pivotally mounted on the supporting frame 110, to make it possible that the lower portion of the hood 128 is swingably moved up and down through the actuation of the power cylinder 128a.
In a rear portion of the vehicle body 2' behind the drive wheels 82 thereof, there are provided in a front-to-rear sequence: a first screw spr~ader 90;
a first screed 91; a second screw spreader 92; and a second screed 93.
The first screw spreader 90 is constructed of two screw spreader units which are provided in each side of the vehicle body 2' and arranged in series in a direction perpendicular to th~ advancing direc-tion of the vehicle body 2' so as 'o be driven at their outer ends, to make it possible that these two screw spreader units are lifted in a central portion relative to the width of the vehicle body ~2373~
while lowered at their outer ends in each side relative to the width of the vehicle body 2', whereby the lower surfaces of the spreader units can be placed in a level below the road surface. The first screw spreader 90 can be l fted by a power cylinder 129a when it is out of service. In the operation, the blocks of the asphalt pavement surface layers having been scarified by the scarifier 88 are further scarified and screeded by the rotor unit 89. Onto the road surface layers thus screeded are fed the pavement materials through a bar feeder 86. The pavement materials drop on the road surface layers and are temporarily screeded to a certain width so as to be more deposited in a central portion in width of the road.
The first screed 91 is fixed to a rear portion of an arm 91a having a substantially inverted U-shaped form in its side view as shown in Fig.8. The arm 91a, the front end of which is fixed to the vehicle body 2' via a power cylinder 91b, is mounted in its rear end portion on the vehicle body 2' via a power cylinder 9lc in a manner that its height can be increased or decreased as desired by actuation of the cylinder 91b, 91c.
373~5 The first screed 91 is equip~ed with a heater 91d inside the same. The heater 91d can heat the entire first screed 91 which is further equipped with wideners (not shown) in its opposite side portion in a manner that they can be advanced toward, or retreated from, the outside of the vehicle body 2' so as to increase or decrease the width of the screed 91. T~e wideners have their outer end portions sloped downward as required.
The first screed 91 performs a primary com-paction of the pavement body.
The second screw spreader 92 has the same construction as that of the first screw spreader 90 except that a setting level of the second screw spreader 92 is higher than the road surface level.
The level setting is adjusted through the actuation of the power cylinder 92a.
The second screed 93 is a conventional means equipped in a conventional manner. The reference numeral 93a denotes a power cylinder for adjusting the height of the second screed 93 and the reference numeral 93b denotes an adjusting handle.
In Fig. 8: the reference numeral 94 denotes a pump for feeding a pressurized fluid to each of the power cylinders and drive motors, and 95 denotes a control panel for controlling each of the units.
~23~3~i In the operation, the paved surface reproducing apparatus 1 of the present invention works as follows:
A description will be made as to a partial surface layer reproducing work for the case where cracks, exfoliations and the like defects are pro-duced in the surface layer of the asphalt pavement.
On a work site, in a state wherein the hopper 85 is filled with the asphalt mixture, the road surface layer is heated by the heater 87. In the operation, it is necessary to heat the asphalt ma-terial to the temperature at which it is softened into the depth of S cm or more below the road surface, so that a far infrared heater is employed as a heater to make it possible for the heat to penetrate the asphalt material deep below the road surfaces. Since it takes a certain time to transmit the heat through the pavement material, it is also possible to heat the pavement material beforehand by means of another road surface heating machine for a predetermined period of time prior to the scarification with the scarifier 88. The time is determined through calculations on the basis of a scarifying depth of the pavement materials, heat conductivities of the pavement materials and the temperature of the opan air. In this case, the heater ~7`is -employed to keep the temperatures of the heated pavement materials 3~
from drop.
The vehicle body is advanced by drlving the drive wheels 82 at a time when the pavement ma-terials are sufficiently heated, while the scarifier 88 and the bits 123 and 124 of the rotor unit 89 are lowered to penetrate into the pavement materials to a certain depth below the road surface. For example, when the claws 88a of the scarifier 88 are lowered to penetrate into the pavement materials by a depth of 5 cm below the road surface, it is possible to scarify the pavement surface layers to the depth of 5 cm below the road surface.
In case the conical bits 123 of the front rotor 115 of the rotor unit 89 are set so as to be lowered to penetrate into the pavement surface layers by the depth of 5 cm below the road surface while the flat bits 124 of the rear rotor 116 are set so as to be lowered to penetrate into the pave-ment surface layers by the depth of 4 cm below the road surface, it is possible to crash and mix the road surface layer materials having been scarified by the scarifier 88 by the use of the front rotor 115 and further to mix and sufficiently knead the road surface layer materials by means of the flat bits 124 of the rear rotor 116.
When the heating room 112 is heated beforehand by the heater 113 and hot air is fed from the blower 73~5 nozzle 114 into the heating room 112 to neat the atmosphere inside the same to temperatures of 120 to 350C, it is possible to heat the heat-insulating plate 112a and to keep the atmosphere inside the mixing chamber 111, at a temperature remarkably higher than that of the open air so that the rotors 115 and 116 are also kept at a high temperature.
Consequently, it is possible to scarify and knead the asphalt pavement surface layer materials by the use of the rotors 115 and 116 in the mixing chamber 111 so that the blocks of the pavement surface layer materials are heated by the high-temperature atmosphere of the mixing chamber 111, the temperatures of the heated rotors 115 and 116 and the heat-exchanging effect when slide-contacted with the heat-insulating plate 11 2a to make it possible that the asphalt pavement surface layer materials are sufficiently kneaded. In this case, the asphalt pavement surface layer materials are further heated in the mixing chamber 111 so as to increase its temperature by an amount of 10 to 30C.
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 the injection nozzle 127 into the mixing chamber 111.
~23731S
According to the advance of the vehicle body 2', new pavement materials lin this case, asphalt compounds) received in the hopper 85 are transferred rearward through the bar feeder 86 and drops onto the pavement before the second screw spreader 92 which evens the new pavement materials thus fed at a certain level, and there-after, the succeeding second screed 93 screeds the pavement materials.
The first screw spreader 90 and the first screed 91 perform screedin~ and compacting of the pavement materials in a level below the road surface, while the second screw spreader 92 and the second screed 93 perform a finish screeding and compacting of the pavement materials.
As a result, it is possible to reproduce the pavement having been damaged by cracks, exfoliations and the like defects over its thickness of 5 cm below the road surface.
The present invention is not limited only to the above construction. Namely, though in the above construction, two units of the rotors 115 and 116 are employed, it is also possible to employ three, four or more units of the rotors 115 and 116 in the paved road surface reproducing apparatus of the present invention~ It is also possible to employ other configurations of the rotors 115 and ~L~373~5 116 and other rotational directions and speeds thereof.
It is possible to replace the rotor unit 89 with other unit, for example such as a rotor unit having a large width by disconnecting the piston rod 126f and the bracket portion 126g. Further, it is also possible to replace the rotors 115 and 116 themselves by other suitably shaped rotors.
The motors are not limited only to the hydraulic type, and any electric heating system can be employed in the heater.
In the first working truck of the present invention, as has been described hereinbefore, the gas bomb tables are attached to the self-propelled truck through the lift so that they can be mounted or demounted by the action of the lift. As a result, the gas bomb or bombs can be simply and efficiently replaced even at the site where no crane is installed.
With the construction thus far described, the second working truck has the following excellent effects:
(a) In case the paved surface is dug deeper than the upper faces of the side grooves or the like and is additionally paved with the new paving ma-terial, the first screed can be dropped to a lower position than the road surface so that it can prevent ~:3~731~i the pavin~ material from flowing out forward.
(b) The paving material having flown foward below the first screed, if any, is prevented from flowing toward the roadsides by the action of the first screw spreader so that it can be primarily spreaded to the predetermined width and thickness.
(c) The first screw spreader is of the two-side drive type so that its one side can be driven in case the remedy is conducted at ona side from the widthwise center of the road.
(d) The first screed is dropped to a lower level than the road surface so that the primary tamping can be executed at the accordingly low level in case the paving material is spread and tamped thick. This makes it possible to increase the spreading and tamping speeds.
(e) If the rotor is raised, the paved surface can be dug up by the scarifier and broken up and spread by the first screw spreader until it can be ~amped and stabilized by the ~irst screed.
(f) The first screed has the built-in heater for heating the primarily tamped surface so that no trouble arises in the adhesiveness between the primarily tamped surface and -the secondarily tamped layer.
(g) The present apparatus of the present invention ~373:~
has both the functions of the paved road surface reproducing means and the asphalt finisher so that it can efficiently remedy the rutted and/or separated surface of the road paved with the asphalt.
(h) Since the rotor unit is provided with a plurality of rotors, it is possible to uniformly scarify, knead and even or spread the pavement materials; And, (i) Since the rotor unit is equipped with the heating means, it .is possible, even when the open air is at low temperature, to keep as it is, or raising, the temperature of the pavement materials thus scarified, to maintain the degree to which the asphalt material has been softened, thereby enabling the material to be uniformly kneaded and spread or evened.
Claims (4)
1. A paved road surface reproducing apparatus comprising:
a first self-propelled, steerable working truck carrying thereon: a road surface heater for heating the surface of a road paved with a bituminous ma-terial; a pair of gas bomb tables disposed at the two side portions of said first working truck and made movable upward and downward by a lift; a first hopper for receiving a bituminous mixture from the outside; and a first conveyor for conveying said bituminous mixture from said first hopper to a rear portion of said first working truck; and a second self-propelled, steerable working truck carrying thereon: a second hopper for receiving said bituminous mixture from said first conveyor; a second conveyor for conveying said bituminous mixture backward from said second hopper; powdery oil-absorber scattering means; a small-scale road surface heater;
a scarifier; softening agent scattering means; and a rotor unit, and arranged in tandem in rear portions of its body with: a first screw spreader adapted to have its lower end face submerged below said road surface; a first screed adapted to have its lower end face submerged below said road surface; a second screw spreader; and a second screed such that they are ordered backward of said second working truck.
a first self-propelled, steerable working truck carrying thereon: a road surface heater for heating the surface of a road paved with a bituminous ma-terial; a pair of gas bomb tables disposed at the two side portions of said first working truck and made movable upward and downward by a lift; a first hopper for receiving a bituminous mixture from the outside; and a first conveyor for conveying said bituminous mixture from said first hopper to a rear portion of said first working truck; and a second self-propelled, steerable working truck carrying thereon: a second hopper for receiving said bituminous mixture from said first conveyor; a second conveyor for conveying said bituminous mixture backward from said second hopper; powdery oil-absorber scattering means; a small-scale road surface heater;
a scarifier; softening agent scattering means; and a rotor unit, and arranged in tandem in rear portions of its body with: a first screw spreader adapted to have its lower end face submerged below said road surface; a first screed adapted to have its lower end face submerged below said road surface; a second screw spreader; and a second screed such that they are ordered backward of said second working truck.
2. The paved road surface reproducing apparatus as set forth in claim 1, wherein said rotor unit is provided with a mixing chamber defined by a supporting frame which is vertically driven through power cylinders, said mixing chamber being provided with an opening in its lower section, a heating room in its upper section, and a plurality of rotors arranged in a direction perpendicular to an advancing direction of said vehicle body in rows so as to be rotated in a direction opposite to the direction of adjacent rotor, said heating room being equipped with heating means for heating an internal atmosphere of said mixing chamber to a temperature higher than the temperature of the open air and keeping said internal atmosphere at said high temperature.
3. The paved road surface reproducing apparatus as set forth in claim 1, wherein said rotor unit is provided with a front rotor and a rear rotor, while conical bits are provided in said front rotor and flat bits are provided in said rear rotor.
4. The paved road surface reproducing apparatus as set forth in claim 2, wherein said heating means is provided with a heat-insulating plate in the upper section of said mixing chamber so as to define said heating room in which gas burners are equipped.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US787,674 | 1985-10-15 | ||
| US06/787,674 US4682909A (en) | 1985-10-15 | 1985-10-15 | Paved road surface reproducing apparatus |
| JP57238/61 | 1986-04-16 | ||
| JP1986057238U JPH0315611Y2 (en) | 1986-04-16 | 1986-04-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1237315A true CA1237315A (en) | 1988-05-31 |
Family
ID=26398257
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000520429A Expired CA1237315A (en) | 1985-10-15 | 1986-10-14 | Paved road surface reproducing apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1237315A (en) |
Cited By (6)
| 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 |
| US9416499B2 (en) | 2009-12-31 | 2016-08-16 | Heatwurx, Inc. | System and method for sensing and managing pothole location and pothole characteristics |
| CN116770664A (en) * | 2023-07-07 | 2023-09-19 | 浙江省第一水电建设集团股份有限公司 | Sustainable feeding device of paver |
-
1986
- 1986-10-14 CA CA000520429A patent/CA1237315A/en not_active Expired
Cited By (8)
| 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 |
| 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 |
| CN116770664A (en) * | 2023-07-07 | 2023-09-19 | 浙江省第一水电建设集团股份有限公司 | Sustainable feeding device of paver |
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