Background of the project The 312 National Highway is one of the important roads for domestic road transport. The road in Shangluo City, Shaanxi Province, due to heavy traffic, heavy trucks, long service years, serious damage to the original asphalt road, has seriously affected the safety and comfort of driving. As one of the key points of the “Twelfth Five-Year Plan†transportation development plan in Shangluo City, the 312 National Road from Shangzhou to Danfeng Section implemented a first-level road reconstruction project. The whole line adopts the technical standard construction of two-way four-lane first-class highway, and the design speed is 80 km/h. Broken old road Project difficulty The terrain and structure of Shangluo City is complex, and it is known as the “eight mountains, one water and one fieldâ€. Most of the Shangluo section of the 312 National Road is a mountainous road with many curved roads and steep slopes. The width of the road is only 8-9 meters. The local road conditions make the project mainly have the following two difficulties: 1. Under the condition of complicated road conditions and large traffic flow, how to achieve rapid construction and minimize the impact on road traffic. 2. In the mountainous areas with fragile ecological environment, how to reduce the environmental impact of new stone mining, transportation and waste disposal during construction, and achieve recycling of materials. Solution: In-situ cold recycling technology from Wirtgen Taking into account the difficulties in project implementation, after comprehensive consideration, the construction party decided to use Wirtgen cement on-site cold regeneration technology to carry out one-time regeneration and maintenance of the asphalt surface layer and local base layer of the original road. The original pavement is soil base layer and subbase layer + 30 cm water stable layer + 11 cm asphalt surface layer. The repair process is to cut off the 2 cm asphalt surface layer and then damage the damaged 9 cm asphalt surface layer material and 11 cm water stable layer. regeneration. Complete cold regeneration and add paving of 20 cm water stable layer and asphalt surface layer The thickness of the regenerated layer after compaction was 20 cm by adding 4.2% cement and 3% water to the old material. After the strength of the regenerated layer is formed, a new water stabilizing layer of 20 cm and an underlying layer of 8 cm of asphalt are added on top, and a 5 cm asphalt wear layer is placed on the top to complete the reconstruction of the pavement. The total regeneration area of ​​the project is about 150,000 square meters and the construction period is one month. As an advocate of cold recycling technology, Wirtgen has been actively involved in this environmentally friendly, cost-effective new process since the 1980s and has become a global market leader in the field of cold recycling. During the construction, the constructor used the SW 16 MC cement spreader with the WR 250 cold recycler. After the SW 16 MC cement spreader completes the cement spreading, the WR 250 performs the in-situ cold regeneration operation. The WR 250 is Wirtgen's latest generation of cold regenerators and is an upgraded version of the WR 2500 S. The WR 2500 S has been widely recognized in the Chinese market. The WR 250 is powerful enough to be fully rebuilt in mountainous roads with large slopes. Its ergonomic design, wide field of view and flexible steering system make the construction of mountain roads with complex road conditions relatively easy. WR 250 and SW 16 MC mountain road construction, strong power, easy to deal with slope construction Whether it's a welt or a device transfer, the Wirtgen WR 250 cold recycler is safe and efficient, reducing road closure time and maximizing traffic. Its efficient milling and mixing performance, as well as precise spray system and automated control, ensure uniformity of recycled mix and significantly improve construction quality. Project achievements: double benefits of environmental protection and economy Compared with the traditional maintenance process, the cement on-site cold recycling construction scheme has obvious advantages in construction quality, construction efficiency and cost. The original pavement material is crushed and mixed by cold recycling machinery to form a uniform material layer, together with the full compaction of heavy-duty compaction machinery to ensure structural integrity. At the same time, through the improvement of the carrying capacity of the base layer, the durability and reliability of the road have been fundamentally improved, and the maintenance cost of the road is greatly reduced. Recycled material after uniform stirring by WR 250 In terms of environmental protection, due to the in-situ recycling of old materials, avoiding the transportation of materials back and forth, eliminating the impact of material transportation on traffic and the impact of material dust on the environment around the road. The chief engineer of the project, You Yalong, summed up the Wirtgen cold recycling construction technology: “In terms of energy saving, construction under normal temperature, low fuel consumption; in terms of environmental protection, it ensures the recycling of waste materials, shortens the construction period and reduces the engineering. Cost and benefit are significant. In general, cold recycling construction is an inevitable trend in the construction of road overhaul projects." Professional construction consulting provides users with strong protection Adhering to the company philosophy of “close to the customerâ€, Wirtgen China's customer service team and experienced cold recycling application experts are always active in the front line of the project, paying attention to the customer's business development and providing customers with various sales including construction consulting. Pre and post sales support. Wirtgen support team and customer construction team The construction of the project was carried out by Shaanxi Liwei Road Recycling Engineering Co., Ltd., and the person in charge of the company said: “The quality of Wittgen's cold recycling equipment is good and the progress is fast. The daily working area is 5000-10000 square meters. Responsive and timely, we have provided a very professional application consultation, so that we are very comfortable in the construction. 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