Explain types of steel supports used in devlopment and de-pillaring districts.
Steel supports:- In devlopment and de-pillaring districts these districts these days,mainly 3types of supports are used: pit props,steel chocks/cog stools,roof bolts. pit props : pit props are hollow steel props at the end of which a shorts length of wood has been hammered.They are light,can be transported easily from one place to another and convenient because their length can be varied easily as required. Steel choc...