Modernization of Technological Process of the Construction of Shaft Premises in Coal Mines of Serbia

T h e m o s t u s u a l s h a p e s o f s h a f t p r e m i s e s c r o s s s e c t i o n i n S e r b i a n m i n e s a r e t r a p e z o i d ( 1 7 % ) , d o - m e d ( 2 2 % ) , a r c h e d ( 2 5 % ) a n d c i r c u l a r ( 3 6 % ) . C u r r e n t l y , t h e s h a f t p r e m i s e s a r e c o n s t r u c t e d w i t h t r a - p e z o i d a n d c i r c u l a r c r o s s s e c t i o n .