Why do you think it was important to have air shafts in the mines?

Why do you think it was important to have air shafts in the mines?

In subterranean civil engineering, ventilation shafts, also known as airshafts or vent shafts, are vertical passages used in mines and tunnels to move fresh air underground, and to remove stale air.

Why is ventilation important in underground mines?

Ventilation is an important aspect of underground mine operations, providing fresh air to miners while diluting or removing hazardous from mine workings. Measure static, dynamic and total air pressures at multiple points. Determine pressure drops from friction and shock losses along the ductwork.

What is the main purpose of mine ventilation?

Ventilation systems are critical to ensure safe working conditions for our people underground. They provide fresh, cool air, and dilute and remove flammable gases as well as machine exhaust gases.

How are mines ventilated?

The concept is known as “flow through” ventilation: air is sucked into a shaft underground by fans on the surface, while extractors at the top of the mine drag the air back out. As it passes through the various passageways of the mine it brings with it the fresh supply of oxygen.

What is the purpose of shaft in a building?

Shafts are critical to the construction and operation of tunnels of all types. They enable access from the ground surface to the tunnel level, for all tunnel types, including giving passengers access to mass transit and underground rail tunnels.

What are air shafts used for?

In manufacturing, an airshaft is a device used for handling winding reels in the processing of web-fed materials, such as continuous-process printing presses.

How did they ventilate old mines?

Early methods of ventilation relied mainly upon natural ventilation through adits and shafts, which were the singular means of entrance, access and transportation of ore. Short lateral tunnels known as crosscuts connected major workings and were also used for ventilation purposes.

What is auxiliary ventilation and what its types explain?

A method of supplementing the main ventilating current in a mine by using a small fan to draw air from the main current and force it through canvas or metal pipe to some particular place, such as the ends of drifts, crosscuts, raises, entries, or other workings driven in a mine.

Why is shaft needed?

What’s the purpose of shaft?

A shaft is a rotating machine element, usually circular in cross section, which is used to transmit power from one part to another, or from a machine which produces power to a machine which absorbs power.

What are ventilation methods for large opening mines?

VENTILATION METHODS FOR LARGE OPENING MINES Three large opening stone mine ventilation methods have been previously described by NIOSH researchers: perimeter, split-mine, and unit-ventilation (Mucho, 2001) (Grau, 2001b).

How does an auxiliary ventilation system work in a mine?

An auxiliary ventilation system takes air from the flow-through system and distributes it to the mine workings via temporarily mounted ventilation fans, Venturi tubes and disposable fabric or steel ducting.

What are the dangers of lack of ventilation in a mine?

A lack of proper ventilation can cause lower worker efficiency, decrease productivity, increase accident rates and absenteeism. The hazards which are controlled by proper ventilation in underground mines include; low oxygen content, toxic gases, flammable gases, fumes, humidity, temperature, airborne dust and products of combustion.

How does air enter an underground mine shaft?

Air enters the mine from surface via a shaft, ventilation raise or adit. The air is distributed through the mine via internal ventilation raises and ramps, and flows are controlled by regulators and permanently mounted ventilation fans.

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