我省河流多,天然砂源丰富,贯彻因地制宜就地取材的原则,采用河砂铺油路面层,节省劳力,降低成本,容易施工,深受群众欢迎。一九七五年以来,我州各县公路工区,在油面施工中,充分利用天然河砂,采取层铺与路拌相结合的方法施工,用层铺油砂封底,以拌和油砂罩面,采用砂料的质量较好, Many rivers in our province, rich in natural sand source, implement the principle of local materials according to local conditions, the river sand pavement surface oil, saving labor, reduce costs, easy construction, welcomed by the masses. Since 1975, the highway work areas in counties of our country have made full use of natural river sand in the oil surface construction, and have adopted the combination of layering and road mixing. Surface, the quality of the sand used is better,