Recently, the road surface safety resilience improvement project of the Dayaoshan Tunnel Group in the northern section of the Le-Guang Expressway was successfully completed. As Guangdong's longest tunnel group, the successful renovation of this project owes to the hardcore support of the SUM7280DS emulsified asphalt synchronous spreader paver developed and manufactured by Shaanxi Construction Machinery. This domestic high-end equipment, with its leading technology, has delivered a brilliant report card for the upgrade of the northern Guangdong transportation artery.

The Dayaoshan Tunnel Group is the core node of the north-south expressway channel in northern Guangdong. This upgrade project covers the section from Zhangxi Tunnel to Meihua Tunnel in the northbound direction, with a total length of 18.805 kilometers and a paving area of 233,200 square meters. It is the largest-scale expressway tunnel group maintenance project in the region in recent years. Due to the project being located in a mountainous tunnel group, the construction space is limited, the construction period is tight, and it is necessary to minimize the impact on traffic flow while ensuring the construction accuracy of the ultra-thin wearing course, which puts forward extremely high requirements for the construction equipment. As the core main force of the project, Shaanxi Construction Machinery's SUM7280DS emulsified asphalt synchronous spreader paver perfectly meets the project's fine maintenance needs.

According to reports, this equipment is an innovative achievement of Shaanxi Construction Machinery for the high-end maintenance market. Relying on the company's years of equipment R&D foundation, it can complete the full process of tack oil spraying, mixture paving, and熨平 (ironing/leveling) in one go, achieving seamless connection of spraying-paving-pre-compaction, completely solving industry pain points such as process disconnection, insufficient interlayer bonding, and uneven oil film in traditional step-by-step construction. The equipment can accurately achieve a 1.5 cm ultra-thin layer paving, with uniform oil film coverage, no leakage, and no overlap. It not only ensures the interlayer bonding and shear strength of the road surface, greatly improving the pavement's anti-skid performance and durability, but also significantly improves construction efficiency. By compressing the operation that originally required multiple pieces of equipment and multiple processes into integrated synchronous construction, it effectively shortens the project control time, creating key conditions for the rapid restoration of traffic in the tunnel group.

During the construction period, the equipment operated accurately and efficiently, collaborating efficiently with the rollers, advancing orderly throughout the process, and ensuring the efficient and high-quality completion of the project with the strong strength of domestic high-end equipment. Currently, the traffic control on this section has been lifted, and the traffic safety and comfort of the northern Guangdong channel have been comprehensively upgraded, providing a smoother and safer traffic experience for passing vehicles.