Why do different types of roller are used for road laying, initial pressure and final pressure?
When the roller is rolling, it should follow the first light, the back weight, the first stability, the back vibration, the first slow and the fast, the first edge, the middle back, the first high, the back low and the wheel trace to be heavyThe rolling wheel should be more than the joint of the adjacent two construction sections.
The rolling shall be carried out along the centerline of the road. The rolling speed is uniform, the wheel track overlap width, the two wheel roller is 30CM, and the three wheel roller is half of the rear wheel width.Baidu Library in the road construction program and roller construction technology and other related articles, suggest to take time to see.
Technical specifications for construction of highway asphalt pavement (JTG40-2004) provides that: "the construction of asphalt pavement should be equipped with a sufficient number of roller, roller selection of reasonable combination and the initial pressure complex pressure final pressure (including molding) the rolling steps, in order to achieve the best compaction effect. No less than 5 rollers should be installed in the double lane asphalt pavement of the expressway. When the construction temperature is low, the wind is large and the rolling layer is thin, the number of rollers should be increased appropriately."Initial pressure is to stabilize the pressure, and in order to reduce the passage, it is necessary to use a small tonnage model, which should be adopted static pressure;In order to achieve the required degree of compaction, vibration compaction must be used, and large tonnage heavy compaction machines must be used;In order to eliminate the wheel trace and satisfy the requirement of the whole Gaoping, the steel wheel hydrostatic pressure should be adopted.
