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6 FAQs about [China Tunnel Rock Drill Instructions]
Can a tunneling boom be used for vertical drilling?
6. Tunneling ROCK EXCAVATION HANDBOOK 240 241 Selecting booms Earlier tunneling booms were specially designed for face drilling. It was not possible to change the boom angle for vertical drilling during operation.
How do you drill a tunnel?
The design of the drilling pattern for tunnels should correlate with tunnel shape and size. The cut is normally placed vertically in the middle or side section, and horizontally on or slightly under the center line of the tunnel. The exact place is often left or right of the tun- nel´s center point and varies with each round (FIGURE6.2.-11.
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.
How long does it take to drill a tunnel?
The tunnel is 7.9 meters wide and 8.9 meters high. Its profile from north to south declines 35 meters and has a cross-section of 68,2 m2. There are 113 holes in each face. The advance in each round is 5.3 - 5.4 m with 20 feet rods. The average drilling time per round was 3 - 4 hours and the average advance per week (120 hours) was 120 m.
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 differ- ence is not much in small tunnels, but becomes more significant in large tunnel face areas.
How deep is a drill hole?
Drilling is performed with a limited hole depth between 1.0 - 2.0 m depending on the loca- tion of the blasting site and the technical conditions of the rock. The first round consists of one cut hole, after which normally two cut holes per round are fired.