The expressway from Lin'an to Jinhua in Zhejiang, abbreviated as Linjin Expressway, starts at the border of Zhejiang and Anhui, called Qianqiuguan, which is a major road connecting these two provinces. This road passes through Lin'an, Tonglu, Jiande, and finally reaches the Jiande section of Hangzhou Xinjing. This section of the road is 85.5 kilometers long, with a designed speed of 100 kilometers per hour. Once completed, it will greatly shorten the distance from central and western Zhejiang to Hangzhou, and also serve as a new passage for the northern Lixi region.
Because it is a highway built in mountainous areas, there are a total of 70 bridges and 30 tunnels on Linjin Expressway. Among them, Yinggong Tunnel is the longest mountain highway tunnel in Hangzhou. The tunnel on the right is 4412 meters long, and the one on the left is 4452 meters long, making it the longest tunnel on Linjin Expressway. Due to the long length of the tunnel passing through the mountain, ventilation, drainage, dust reduction, and other works are very difficult during construction.
In order to ensure the smooth progress of this project, Hangzhou Transportation made advance plans and supervised and guided the project team to develop scientific construction plans. At the same time, people working on Yinggong Tunnel actively responded to the call of Linjin Expressway and introduced some advanced mechanical equipment, such as double-arm rock drilling platform carts, waterproof board laying platform carts, and arch bridges. They have created a mechanized construction assembly line from excavation to support, improving construction efficiency.
The LanHi LCG312A multi-functional platform is a device that integrates functions such as steel arch installation, welding mesh and connecting bars, and excavation surface measurement. This equipment uses a car chassis, so it can move and relocate flexibly to deal with various situations, with high efficiency. Its three arms adopt remote control for the middle arm and local remote control for the side arms, enabling simultaneous operation. This not only reduces labor costs and construction risks but also achieves the standardization and industrialization of tunnel arch erection.
On January 17, 2022, an important part of Linjin Expressway—Yinggong Tunnel was successfully penetrated, marking the completion of the main line of Linjin Expressway.