Application Scenario
In engineering machinery, tunnel mining is a common project. Generally, tunnels are needed for three-dimensional transportation, mountain crossing, underground passage, river crossing, sea crossing, pipeline transportation, cable under grounding, and water conservancy projects.
Types Of Tunnels
1.Open cut back fill tunnel
Open cut back fill tunnel is one of the construction methods of tunnel construction, because the construction method is to first dig a tunnel down the ground and then back fill the road. This method is suitable for the construction of underground tunnels, and in a few cases can be used as underwater tunnels
2.Drilling tunnel / mining tunnel
First build a shaft from the surface to the underground construction area, and then continue to dig directly from the underground. If special machinery is used, it is a drill tunnel; if no machinery is used, rely on blasting or manual excavation (drilling and blasting method), then Mining method tunnel.
3.Immersed tunnel
Construction of undersea tunnels is available
Disadvantages of the drill-blast method
In most tunnel construction cases, the drilling and blasting method is a common method. Drilling and blasting excavation operation procedures include measurement, drilling, charging, blasting, ventilation, ballast, anchor, stand, hanging net, spray anchor and other processes.
1.Disadvantages of blasting
In the large-scale tunnel mining, there is a huge hidden danger in the blasting of charge.
The safety goals of the tunnel project: to prevent deaths due to business, to prevent serious collapses, to prevent explosions, and to prevent loss of blasting items.
—— "Tunnel Engineering Safety Management Measures"
In the current mining process, there is a step of tunnel face support, but it cannot withstand the uncertainty of the amount of explosion. And in urban tunnels, or village tunnels that rely on mountains, the huge decibels produced by blasting is also a kind of sound pollution.
2.Complex geology
Long (extra-long) tunnels and tunnels with important structures such as bad geology, weak surrounding rocks, Karst geology, gas and combustible gas, and crossing reservoirs or traffic channels.
Rock Splitter
In order to avoid the harm caused by blasting, some solutions have appeared on the market such as: rock splitting machine
It can be seen from the principle in the photo that when using a splitting machine (separating stage), the splitting machine must be inserted into the rock by hydraulic power first. The length of the entire preparation process (insertion of the splitter ) is too costly. It is not conducive to improving efficiency. Although it solves the safety hazard of blasting.
ANT Rock Saw
Do you know that in today's tunnel mining, there is a newest method, which is to feed the tunnel face by rock saw and breaker.
Construction method:
1. Use a rock saw to cut two knives at an interval of 5 cm, and the middle is broken
2. Use a stone splitter to drill two rows of holes about 0.5 meters apart with the center broken as the center, and perform hydraulic cracking.