Road Maintenance Project in Chifeng, Inner Mongolia

For the road repair project on Qinghe North Road in Chifeng City, Inner Mongolia, the contractor, Chifeng Chengda Municipal Engineering Co., Ltd., efficiently completed the asphalt layer replacement work with the Wirtgen Group's state-of-the-art machines and application technology, including a Wirtgen W 205 large milling machine, a Super 1800-3 paver equipped with sprinkler modules, and a HUMMER HD O 128V dual drum roller.

In the face of mounting traffic pressures, the crack and rutting management of the 3.5-meter-wide road surface on Qinghe North Road in Chifeng serves as a prime example of modern road maintenance technology. Chifeng Chengda Municipal Engineering Co., Ltd. developed a comprehensive solution involving "fine milling-intelligent paving-oscillating compaction" that showcases the coordinated operation of the W205 large-scale milling machine, Super 1800-3 spray-type paver, and Hummer HD O 128V roller. This innovative approach offers a triple technical model for the industry, representing a significant advancement in construction machinery and techniques.

The W205 is equipped with a precision milling rotor with 672 Generation A rotary cutters for milling 2 cm layers with millimetre flatness and a cutter spacing of 6 mm, which produces a fine texture and provides the ideal substrate for the subsequent construction of ultra-thin claddings. 18 mm cutter spacing rotor technology combined with the three-speed function ensures construction efficiency and optimum cost control. 18 mm rotor spacing combined with the three-speed control function ensures construction efficiency and optimal cost control. The combination of the 18 mm rotor pitch and the three-speed control function ensures efficiency and optimum cost control. This fine finish is a clear departure from conventional rough milling and reflects the new concept of “scalpel-type” maintenance.

The technological breakthrough of the Super 1800-3 spray paver lies in the integrated innovation of simultaneous spraying and paving. The innovative design of our system includes five spray bars that can be adjusted with precision to ensure optimal emulsified asphalt dosage, ranging from 0.3 to 1.6 kilograms per square meter. This dosage is meticulously regulated in pulse mode, offering unparalleled control over the application process.

Furthermore, our system incorporates advanced pre-heating technology, operating within a temperature range of 70 to 80 degrees Celsius. This innovative feature not only enhances the interlayer bonding strength but also boosts construction efficiency, ensuring superior performance and reliability. The AB 600 hydraulic retractable screed facilitates the paving of 1.2-2mm ultra-thin wearing course, and this "heat-to-heat" process reduces material costs by approximately 30% compared to traditional methods.

This project confirms the industry truth of “three parts material, seven parts workmanship”. The full-cycle technical service provided by Wirtgen China highlights the value of in-depth synergy between the equipment manufacturer and the constructor. When the strategy of a strong transportation country meets the accelerated urbanization process, this kind of maintenance model, which integrates precision machinery, digital control and material science, may become the key to the sustainable development of urban roads.