These traditional methods have proved through years of production practice, whether it is the use of heavy traffic asphalt or modified emulsified asphalt filling, with the surface and the grass-roots temperature contraction, up to no more than 1 year, after the repair of cracks in the original filling position Re-cracking, the failure rate of more than 86%, had to repair the second year. This regular maintenance, not only increased the cost of conservation, and frequent maintenance operations will cause a lot of inconvenience and insecurity driving factors. Slotting repair method is suitable for small and medium-sized cracks, is a common foreign crack treatment methods, the use of equipment, including slot machines and filling machine, fill the material used for crack repair specially designed sealant (modified asphalt polymer), open Slot size of at least 1 cm wide, 1 ~ 3 cm deep, slot depth, width ratio should not exceed 2: 1, the depth ratio is better. Slot repair method Construction process is generally divided into five steps. Ready to work. Check the slotting machine and filling the sewing machine to ensure that the technical condition is good; according to the specific situation of the cracks in the road to determine the sewing design; start the filling machine and sealant heating tank to add sealant, the sealant heating, stirring 193 ��, can not exceed 204 ��; during the filling machine will be trailer hanging behind the main car, and the sealant, isolation pier, safety signs, slot machines and shoulder-back hair dryer or hot air gun installed in the main car , Dragged to the scheduled construction site, half of the half of the highway closed as a construction area. Slotted. According to the design of the slot size, pre-adjust the slotting slot depth, and then slot operation. Operation, according to the type of crack width, timely adjustment slot size, to meet the minimum design requirements. Clear groove. Use a shoulder-back blower or hot air gun to clean the slag in the tank and the dust in the range of at least 10cm on both sides of the crack. Irrigation joints. If the temperature is lower than 4 �� when the sewing, filling machine must be equipped with preheating equipment on the slotted parts of the preheat, if the temperature is not preheated on the repair, will reduce the adhesion of sealant; If the temperature is higher than 4 �� when the patch, can not be preheated, the general preheat after the patch effect is better. When the sealant heating temperature reaches about 193 �� C, the sealant is evenly poured into the tank with a pressure jet with a scraper on the filling machine and dragged into a certain width and thickness seal on both sides of the crack. brick paving equipment for sale traffic engineers and lawmakers have designed asphalt milling teeth for sale cement street pavement repair