1. Building materials: This includes all kinds of building materials used for bridge and tunnel construction, such as steel, concrete, masonry, asphalt, etc.
2. Mechanical equipment: all kinds of mechanical equipment, such as excavators, road rollers, cranes, pile drivers, concrete mixers, etc. Build bridges and tunnels on the expressway.
3. Construction instruments: various tools and instruments, such as shovels, picks, hammers, wrenches, pliers, measuring tools, etc. , need to be used in the construction process.
4. Safety equipment: The safety of workers must be considered in the construction process, so it is necessary to purchase various safety equipment, such as safety helmet, protective clothing, safety rope and safety net.
5. Electrical equipment: used to provide power supply, lighting and communication equipment, such as generators, cables and lamps.