What kind of surrounding rock is suitable for the tunnel drum cutters - What are the uses of the drum cutter ?

Writer： admin Time：2022-11-25 22:07:43 Browse：228℃

The tunnel drum cutter is suitable for some medium and low hardness surrounding rocks, and can also be used in high hardness rocks, but the milling speed will be reduced and the effect will be very poor.

The main uses of hydraulic drum cutters are tunnel excavation and contour correction, mining, channel slot milling, building demolition, asphalt concrete pavement milling, rock permafrost milling, root milling and other fields.

According to the principle of milling excavation, the factors affecting the efficiency of milling construction include the geological conditions of surrounding rock and equipment performance.

The mechanism of the tunnel drum cutter is to cut, grind and break the surrounding rock, so the geological conditions of the surrounding rock mainly include three factors: the physical and mechanical properties of the rock, mainly the strength and wear resistance of the rock; the structure and structure of the rock mass, including The relative relationship between rock dip angle and tunnel axis, that is, rock mass joints, fracture spacing and distribution; geological and hydrological environment, fracture water abundance, etc. the strength of the rock. The process of cutting and destroying rock mass by milling equipment is the process of rock mass from elasticity to plasticity and then to destruction. Therefore, the strength of rock mass directly affects the crushing efficiency of tunnel milling machines.

The tunnel drum cutter has many working conditions, and under different working conditions, the tunnel milling machine has different stress conditions. For example, in soil trenching engineering, hydraulic drum cutters can be fully submerged in the soil, and all tunnel milling machines are involved in the work of hydraulic milling machines. When milling medium and low hardness materials, the stress conditions of each hydraulic milling machine are not bad.

Even if the stress of each tunnel milling machine varies greatly, compared with the design working capacity of the tunnel milling machine, the stress unevenness or local hydraulic drum cutters stress will not have a great influence on the work of the hydraulic milling machine. But in the hard rock milling process, due to the high hardness of the rock, the stress of the tunnel milling machine is the worst, the tunnel milling machine can only mill the rock at a small drilling speed, and in the horizontal milling process, it can only mill at a small Thickness is milled horizontally.

In this working state, not all the tunnel drum cutters in the arc segment participate in the work, especially in the horizontal milling process, only the tunnel milling machines at the intersection of the straight line segment and the arc segment can participate in the milling work.

In low-hardness rocks such as weathered rocks, the tunnel drum cutter can reach 25-40m3/h (different from rock density and fragmentation). Tunnel drum cutters can also mill concrete with little or no reinforcement.

The tunnel drum cutter  and small drum cutter on the 20-ton excavator can easily mill reinforced concrete with a diameter of less than 30mm. Tunnel drum cutter can replace blasting construction, avoiding adverse conditions such as reduction of rock strength, loose structure, and local rupture caused by blasting vibration. It is beneficial to protect the original self-supporting capacity of the rock mass, and is not easy to cause large-scale collapse;

In tunnel construction operations, excavator drum cutter  can replace very expensive tunnel excavators, shield machines and other machinery, greatly reducing construction costs;

Tunnel drum cutter  is very effective in rock mining operations in the following rocks: Low hardness rock; Weathered structural rock; High hardness but structural layer milling capacity up to 80-120 tons (depending on rock hardness); Tunnel drum cutters can replace excavator Construction, protect the environment.