About Three-arm tunneling rock drill operating procedures
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6 FAQs about [Three-arm tunneling rock drill operating procedures]
What type of drilling equipment is used in tunneling & drifting?
Rock drills and mechanized drilling equipment used in tunneling and drifting are designed to give optimum performance in this hole range. Drifting rods are designed to match hole sizes and needs of horizontal drilling. Typical applications use tunneling rods and 1 1/4" and 1 1/2" drill steel sizes.
What size drill steel do you use for tunneling?
Typical applications use tunneling rods and 1 1/4" and 1 1/2" drill steel sizes. Drill steels between 1" and 1 1/8" are used for hole sizes less than 38mm. The number of holes needed per tunnel face area decreases as hole size increases. The difference is not much in small tunnels, but becomes more significant in large tunnel face areas.
How do you design a drilling pattern in tunneling?
When designing a drilling pattern in tunneling, the main goal is to ensure the optimum number of correctly placed and accurately drilled holes. This helps to ensure successful charging and blasting, as well as produce accurate and smooth tunnel walls, roof and floor.
What size hole do you need for tunneling & drifting?
Most tunneling operations today are based on hole sizes between 38 -51mm in diameter. Only cut holes are larger than 51mm. Rock drills and mechanized drilling equipment used in tunneling and drifting are designed to give optimum performance in this hole range. Drifting rods are designed to match hole sizes and needs of horizontal drilling.
What are tunnel driving techniques?
The development of tunnel driving techniques has been tremendous during the last few years. The drilling techniques have developed from pneumatic drilling machines to electro-hydraulic drilling jumbos with very high capacity.
How is explosive pumped into a hole in a tunnel?
In tunnel blasting operations, the explosive or blasting agent may be charged into the hole by a pump truck. An explosive or blasting agent, such as emulsion, can be manufactured at an on-site plant and pumped directly from the plant into the pump truck. Care must be taken when charging holes containing water.