Highway construction, quality first. This is the hard truth that all highway builders understand. Fuling Highway is like a mirror. They pay attention to practice, dare to innovate boldly, and skillfully "cut corners" to rebuild the asphalt pavement. Through many practices, it has been proved that not only the quality is well guaranteed, but also the time and investment cost are saved, with an average cost saving of 400000 yuan per kilometer. It has withstood a severe test in this year's once-in-a-century hot weather.
Not long ago, Chongqing Fuling District Traffic Bureau Highway Affairs Center Director Cha Yu and his party took reporters to Fuling Provincial Road S206 Kainan Road and County Road X177 Shanfu Road for on-the-spot inspection. The road had been completed and put into use a year ago, but the road surface still felt smooth and tidy, without any flaws. Director Zha said: This is the effect of large-scale rectification after they have summarized through many practices.
According to Chen Yunming, the technical director of the center, in the past, the asphalt pavement overhaul and reconstruction project generally adopted the method of "milling the original asphalt surface layer + paving the water-stable layer + paving the asphalt surface layer". He believed that this traditional technology was both troublesome and time-consuming. It is necessary to dig out the original asphalt piece by piece with an excavator and transport it out. After the road surface is leveled, new stones are pulled to make a water-stable layer and asphalt surface is paved. The old asphalt must be pulled out to find a place to deal with it, otherwise it will cause environmental pollution. It is labor-consuming, time-consuming and cost-consuming, and it is not environmentally friendly. A group of people in
the center constantly summarized in their work, starting from low-carbon green construction, boldly tried and dared to innovate, and adopted the reconstruction scheme of "roughening the original asphalt surface layer + paving the water-stable layer + paving the asphalt surface layer" to construct a large area of pavement, and retained the original asphalt surface layer as the base of the new pavement, so as to ensure the equivalent strength of the pavement. Reduce the thickness of the new structural layer, avoid the environmental pollution caused by the milling waste of the old asphalt concrete surface layer, reduce the carbon emission and the consumption of mineral resources, and save the time and cost of pulling the old asphalt out for reprocessing. Through accounting, the investment per square meter is saved by about 40-55 yuan. It not only "steals work, reduces materials, but also saves construction time".
(This is a water-stabilized layer added to the surface of the original asphalt after roughening, and the seriously damaged part of the old asphalt is excavated.)
At present, the reconstruction scheme has been adopted in the pavement reconstruction project of about 40 kilometers of Fuling Provincial Highway S206 Kainan Road and County Highway X177 Shanfu Road, which saves about 16 million yuan in investment. After two years of operation, the pavement is in good condition, especially under the high temperature condition of more than 40 degrees for nearly half a month this year, the pavement has no rutting, swelling and other diseases, and its structural stability at high temperature has been tested, completely breaking through the shackles of "semi-rigid base + flexible base + semi-rigid base" to form "sandwich biscuit". The advantages of saving time, effort, money and environmental protection have been highlighted.
According to the director of the center, they have also carried out a variety of technical tests, such as restorative regeneration seal, gravel seal, composite seal, fine surfacing, micro-surfacing, ultra-thin overlay, etc., and explored the application of test sections in more than 10 different national, provincial and county roads, and made comparative exploration on the selection of sections and processes. Accumulate more practical experience for later application.
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