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Scavi e tunneling

d

38-51 millimetri

1 1 / 2 "-2"

L

30-60 centimetri

1'-2 '

D

1-1.8 m

3'-6 '

45 ° -60 °

Reliever buchi sono necessari quando è profonda trincea

Ripetere la stessa procedura per il caso più profonda

d

38-51 millimetri

1 1 / 2 "-2 '

L1

40-60 centimetri

1'4 "-2 '

L2

30-40 centimetri

1'-1'4 "

D

1-1.8 m

3'-6 '

d

38-44 millimetri

1 1 / 2 "-1 3 / 4"

L

30-60 centimetri

1'-2 '