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Weight deviation of hollow steel for rock drill

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n75_TunnelingAndGeotechnical

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IS 10270 (1982): Guidelines for design and construction of

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Weight deviation of hollow steel for rock drill [PDF]

6 FAQs about [Weight deviation of hollow steel for rock drill]

What loads does a drill rod experience during a deviation?

As a drill rod passes through a deviation, it is subjected to an alternating bend load. That is to say, with each rotation the material is subjected to tension through the outside of the bend and compression through the inside.

What determines the capacity of a drill rod?

The capacity of a drill rod is determined by two limitations of its steel material: the elastic bending limit of the midbody material, and the fatigue limit of the male end material.

How does drill rod size affect bending load?

The bending load induced in drill rods increases with the drill rod size and midbody stiffness. This means that larger drill rod sizes can withstand more bending before failing, while smaller sizes may bend more easily.

What happens when drilling loads or hole drag changes suddenly?

Once buckled into an elastic corkscrew, the rod string acts like a long coil spring wherein any sudden changes in drilling loads or hole drag are dynamically magnified and reflected in waves, up and down the rod string.

What can reduce the fatigue strength of rods near the drill rig?

Rods near the drill rig are eventually subjected to pullback tension as hole depth increases, which can drop the fatigue strength to less than 25 % of yield strength (depending on the amount of pullback, refer to Figure 1 above).

What makes Sandvik rock drill steel unique?

Manufacturing The Sandvik rock drill steel mill is the most up-to-date in the world. It is fully automated and designed specifically for the manufacture of rock drill steel. Product quality Product quality begins at the very star t of the process, where raw material is carefully selected for melting in our 75 tonnes electric arc furnace.