Joints on tunnel farmings

farmings 

drawing of dome tunnel spacing of pillers is 4 m and door size 2*1

this is top vent arch

A design that can be adopted at high wind locations the inclined members are called hockeys and they varies 2 m tob2.5 meter length 

this is green net covering 

Tunnel farming is very much in pratice now a days so there are some drawings you can follow while tunnel farming