Milling and digging machine is a combination of milling and digging head and excavator - small boring machine, large tunnel excavation requires a boring machine or shield machine, milling and digging machine applied to low and medium hardness rock tunnel excavation compared with sliding explosion method has the following advantages.
1. The milling and digging machine has a durable metal drilling plate bearing structure and polishing blade, which can excavate medium hard, medium hard or below rocks in a large area.
2. Mechanical excavation reduces the interference to the surrounding rocks and avoids the reduction of rock strength, the loosening of rock structure and the local rupture of rock structure caused by explosion vibration.
3. It is conducive to protecting the original self-bearing capacity of the rock mass, and is not easy to cause large-scale deformation and local shedding.
4. Strong adaptability, can dig out any shape and size of the cross section: the width of the metal cutting head of the milling machine can be changed with different rocks, the milling machine does not need to remove it from the digging table, the milling machine can adjust 360 degrees.
5. The structural milling machine replaces the explosion to avoid the reduction of rock strength caused by the vibration of the explosion, and the rock mass is such as structural loosening and local explosion. Protect the original self-stress of the rock to avoid the reduction of rock strength leading to large-scale collapse.
6. Instead of machines such as tunnel excavation table and shield table, the construction cost is greatly reduced and the hardness of the rock is reduced; For weathered rocks, rocks with high hardness but layered structure and rocks with high metal cutting capacity reach 80-120 tons per hour (depending on rock hardness).
7. The small milling and digging machine can replace different teeth, grooves, metal cutting wheels, rocks and so on according to the working environment.
