CHARVAT, Jiri (Obranska 959/180A, Brno, 614 00, CZ)
PRUSA, Miroslav (25.dubna 177, Zelesice, 664 43, CZ)
KOTRBATY, Martin (Sluzeb 5/256, Praha 10, 108 00, CZ)
CHARVAT, Jiri (Obranska 959/180A, Brno, 614 00, CZ)
PRUSA, Miroslav (25.dubna 177, Zelesice, 664 43, CZ)
| Patent Claims 1. A method of repairing potholes in asphalt roads, the postholes consisting of local bordered cavities in a damaged asphalt road, the method including the following sequence of steps : - a recycled material, created by an abraded material grinded off a surface layer of a used road, is preheated to 120-200 0C; - the surface of the pothole is heated to 120-200 0C; - the preheated recycled material is applied to the pre-heated surface of the pothole in the road; and - it is rolled into the pothole. 2. The method of repairing asphalt roads according to claim 1, c h a r a c t e r i s e d b y t h a t the asphalt road pothole is preheated with 50 - 100 cm of end lap from its boundary line. 3. The method of repairing asphalt roads according to claim 1, c h a r a c t e r i s e d b y t h a t the heated area of the asphalt road pothole is at least partially scrabbled before the recycled asphalt mixture is applied and the applied recycled material is smoothed before rolling in. 4. The method of repairing asphalt roads according to claim 1 or 3, c h a r a c t e r i s e d b y t h a t the applied recycled material is charged with asphalt emulsion before it is rolled in. 5. The method of repairing asphalt roads according to claim 1, c h a r a c t e r i s e d b y t h a t the recycled material is heated to 150 - 180 0C. 6. A device for repairing asphalt road potholes by a method according to claim 1, c h a r a c t e r i s e d b y t h a t it includes a container (1) for the recycled material consisting of hoppers (6) between the adjacent vertical walls (9) of which there are exhaust-heat chambers (7) arranged for transfer of heat from vertically fed exhaust gas of the gas burners (8) coming to the bottom part (12) of the exhaust-heat chambers (7) and a a heating panel (21) for planar preheating the surface of the asphalt road pothole. 7. The device for repairing asphalt road potholes according to claim 6, c h a r a c t e r i s e d b y t h a t the planar heating panel (21) , provided with heating bodies on one side, is arranged together with the container (1) of the recycled material on a mobile chassis (31) and pivoted in a tilting way around the axis o3 parallel to the transversal axis of the mobile chassis (31) . 8. The device for repairing asphalt road potholes according to claim 6 or 7, c h a r a c t e r i s e d b y t h a t the container (1) for the recycled material and the heating panel (21) are arranged on the mobile chassis (31) along with a feeding source (32) for feeding the heating bodies (22) . 9. The device for repairing asphalt road potholes according to claim 7, c h a r a c t e r i s e d b y t h a t the heating bodies (22) are created by gas burners. 10. The device for repairing asphalt road potholes according to claim 7, c h a r a c t e r i s e d b y t h a t the hopper (6) for storing recycled material is fitted in its upper part with a feeding hole (13) for filling the recycled material and a charging hole (14) in its bottom part for charging the preheated recycled material whereas and the charging hole (14) opens in the sides of the mobile chassis (31) and is fitted with a lid (10) . |
Technical field
The invention relates to a method of repairing potholes in asphalt roads, which consist of local bordered cavities in a damaged asphalt road. Furthermore, the invention relates to a device for asphalt road repairs.
Background of the invention
Asphalt roads have a 4-6 cm thick upper surface layer made of a mixture of asphalt, petty gravel aggregates and fine milled limestone, which is also in the form of small particles. This upper layer is called a wear layer by professionals. Due to the service load of the asphalt road along with the effects of weather, mainly water and rain, petty gravel aggregates gradually crumble away from the surface layer of the asphalt road, creating planar potholes of various depths. Potholes catch surface water, which corrupts the pothole walls and bottom, making the pothole wider and deeper.
Currently, the repairs of potholes in asphalt roads are carried out in multiple ways. According to one method, a new asphalt mixture is heated to high temperature in a container of a vehicle; then, the mixture is applied and rolled into the pothole. Since the road surface in the area of the pothole has the temperature of the surround, the new asphalt mixture does not amalgamate with the pothole surface, ^ and the asphalt- mixture filler becomes loose in time due to the service load. According to another method, the asphalt road potholes are filled in by petty gravel aggregates mixed with asphalt blasted into the pothole. Because of indefinite dosing, the applied mixture of gravel aggregates and asphalt gets pushed out of the pothole in time, forming a bulge in the place of the pothole, which is an obstacle to the traffic impairing trafficability . According to still another method, the pothole area and its surround is cut into a regular form into which a new asphalt mixture is applied. The repair is, however, lengthy, expensive and connections between the repaired area and the old road crack.
Asphalt or its mixture with gravel aggregates heated by open flame or heat radiated directly to the substance are used to carry out all methods of repairing asphalt road potholes, which are known to date. At temperatures in excess of 200- 25O 0 C, the asphalt component gets over-burnt and loses its binding function for petty gravel aggregates. Over-burnt asphalt cannot be used anymore and the mixture of over-burnt asphalt and gravel aggregates ceases to be cohesive and becomes loose.
It is the object of the invention to eliminate shortages of the current state of the art and offer a method of repairing asphalt road potholes, which makes it possible to repair various small potholes, which is not too labor- intensive, which is cheaper than usual repairs, which does not need any heavy vehicles and which results in longer durability of the new asphalt road surface. Furthermore, it is the aim of the invention to offer a device for repairing asphalt road potholes and achieve the aforementioned results .
Summary of the Invention
The method of repairing potholes in asphalt roads, which consist of local bordered cavities in a damaged asphalt road, eliminates shortages of the current state of the art and achieves the aim of the invention. The method of repairing according to the invention includes preheating of a recycled material, which is the material grinded off the surface layer of the used road, to 120-200 "c, heating of the surface layer of the potholes to 120-200 0 C, applying the recycled material to the pre-heated area of the pothole in the road and rolling of the recycled material into the pothole. According to the advantageous realisation, the asphalt road pothole and its surround within 50-100 cm are heated. According to the advantageous realisation, the heated area of the asphalt road pothole is at least partially scrabbled before the recycled asphalt mixture is applied and the applied recycled material is smoothed before rolling in. According to the advantageous realisation, the applied recycled material is charged with asphalt emulsion before it is rolled in. According to the advantageous realisation, the recycled material is heated to 150-180 0 C. Shortages of the current state of the art are overcome and the aim of the invention is achieved also by a device for repairing asphalt road pothole, which includes according to the invention a container for the recycled material consisting of hoppers, between the adjacent vertical walls of which there are exhaust-heat chambers for heat transfer from vertically fed exhaust gas of gas burners headed to the bottom part of the exhaust-heat chambers, whereas the device also includes a heating panel for a planar preheating the surface of the asphalt road pothole. According to the advantageous realisation, the planar heating panel, which is fitted with heating bodies on one side, is placed together with the container for the recycled material on a mobile chassisand pivoted in a tilting way around the axis parallel to the transversal axis of the mobile chassis. According to the advantageous realisation, the container for the recycled material and the the heating panel are arranged on a mobile chassis along with a feeding source for feeding the heating bodies. According to an advantageous realisation the heating bodies are created by gas burners. According to an advantageous realisation, the hopper, in which the recycled material is stored, is fitted in its upper part with a feeding hole for filling the recycled material and a charging hole in its bottom part for discharging the preheated recycled material whereas the charging hole opens in the mobile chassis side faces and it is fitted with a lid.
The way of repairing asphalt road potholes according to Claims 1 through 5 makes it possible to repair potholes of various form and depth, with both small and large area; it is not labor-intensive, it is considerably cheaper than the usual methods, it does not need any heavy vehicles and it features longer durability of the new asphalt road surface.
The device for repairing potholes according to Claims 6 through 10 makes it possible to repair potholes according to the invention; above all, it prepares an optimal raw material for repairs of potholes according to the invention; its size is small, it can be easily operated and transported and it makes it possible to repair potholes occurring in scarce numbers in long road sections. It also allows to carry out the repairs of the potholes at any surrounding temperature and weather .
Description of the Drawings
The device for repairing potholes according to the invention is illustrated by drawings in which Fig. 1 shows a face view of the container for the recycled material; Fig. 2 shows a side view of the container for the recycled material; Fig. 3 shows a view of the heating panel; and Fig. 4 shows the arrangement of the device on a mobile chassis. Detailed description
Before repairing asphalt roads or before repairing the underbed of asphalt roads, the asphalt road upper layer, 4-6cm thick, is removed by grinding. A substance, named recycled material, is produced by such grinding. The recycled material is considered an ecological waste; currently, it is not used for any purpose.
According to the invention the aforementioned recycled material can be used for repairs of asphalt road potholes. According to the method of repairing asphalt road pothole according to the invention, the recycled material, which is the material grinded off the surface layer of the used road, is preheated to 120-200 0 C, the surface layer of the pothole is heated to 120-200 0 C, the preheated recycled material is applied to the pre-heated area of the pothole in the road and rolled into the pothole.
When asphalt is heated and its temperature exceeds approximately 250 0 C, it gets over-burnt; the process is irreversible and asphalt loses its basic property consisting in the ability to bind loose materials. The over-burning temperature of asphalt can be higher in certain kinds of asphalt, especially natural asphalt, up to 300 0 C. To prevent asphalt over-burning, the recycled material is heated with advantage to the temperature of 150-180 0 C.
The method of repairing asphalt road potholes is also based on the fact that the material applied to the pothole amalgamates best with the pothole surface ^ when temperatures of the applied material and pothole surface are same or very similar. Not only the inner space of the pothole, but also the area within 50-100 cm round the pothole is heated to improve amalgamation. The heated area of the asphalt road pothole is at least partially scrabbled before the recycled asphalt mixture is applied and the applied recycled material is smoothed before rolling in. It proved advantageous to charge the applied recycled material with asphalt emulsion before it is rolled in, because the surface layer of the applied recycled material becomes more binding when charged with asphalt emulsion.
According to Fig. 1 the container 1 of the recycled material, which is seated on the frame 15, consists of hoppers 6 between which there are vertical exhaust-heat chambers 7. Under the exhaust-heat chambers 7 there are gas burners 8 coming into the bottom part 12 of the exhaust-heat chambers 7. Exhaust gas from the gas burners 8, which is very hot, flows through the exhaust-heat chambers 7 along the walls 9 of the hoppers 7, passing its heat to the walls 9. The flow of exhaust gas from the gas burners 8 passes heat through the walls 9 of the hoppers 6, which causes indirect heating of the recycled material stored in the hopper 6 in such a way that the asphalt component does not get over-burnt. The size of the hoppers 6 is selected with advantage in such a way that the horizontal cross section of the hoppers 6 allows an easy heating of the hopper 6 contents by heat passed through the walls 9, and the contents of the hopper 6 does not need to be mixed. The hopper 6, in which the recycled material is stored, is fitted in its upper part with a feeding hole 13 for filling the recycled material and a discharging hole 14 in its bottom part for discharging the preheated recycled material. The feeding hole 13 is covered by a pair of lids 3 pivoted round the axes parallel to the transversal axis of the mobile chassis 31, and the charging hole 14 opens in the side faces of the mobile chassis 31 and it is fitted ^ with a lid 10 pivoted round the axis parallel to the longitudinal axis of the chassis 31. The container illustrated in Fig. 2 has in the side view a pair of lids 3 in the visible side wall 2 of the insulated casing. The charging holes 14 in the container face are covered by the lids 10, which are controlled by the control mechanism 11.
According to Fig. 3 the means for preheating the surface of the asphalt road pothole consists of a planar heating panel 21, which is fitted with heating bodies 22 on one side. The heating panel is arranged in a tilting way around the axis o3 parallel to the transversal axis of the mobile chassis 31. The heating bodies 22 can consist with advantage of gas burners. The heating panel 21 tilts round the axis parallel to the transversal axis of the mobile chassis.
According to Fig. 4 the hoppers 6, in which the recycled material is stored, are fitted in their upper parts with feeding holes 13 for filling the recycled material and a discharging holes 14 in its bottom part for charging the preheated recycled material. The feeding hole 13 is covered by a pair of lids 3 pivoted round the axes parallel to the transversal axis of the mobile chassis 31, and the discharging hole 14 opens in the mobile chassis sides 31 and it is fitted with a lid 10 pivoted round the axis o2 parallel to the longitudinal axis of the chassis 31. Arranged on the mobile chassis 31 there are a container for the recycled material, a means for preheating the asphalt road pothole, which consists of a planar heating panel 23 seated in a tilting way on the mobile chassis 31 round the axis o3 parallel to the transversal axis of the mobile chassis 31 and, finally, a source 32 for feeding the heating bodies 22. Similarly as in the Fig. 1, the exhaust-heat chambers 7 are arranged between the vertical walls 9 of the neighbouring hopers 6. Under the container 1 of the recycled material the gas burners 8 are arranged and exhaust to the bottom part 12 of the exhaust- chambers 7. The heating panel 21 can be tilted to a horizontal position to such height above the road, that the heating panels 22 may preheat the surface of the potholes as well as its surroundings to the temperature 120-200 °C as required.