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By N2H

Trenching And Tunneling

d

38-51 mm

1 1/2″-2″

L

30-60 cm

1′-2′

D

1-1.8 m

3′-6′

45°-60°

Reliever holes are necessary when trench is deep

Repeat the same procedure for deeper case

d

38-51 mm

1 1/2″-2′

L1

40-60 cm

1′4″-2′

L2

30-40 cm

1′-1′4″

D

1-1.8 m

3′-6′

d

38-44 mm

1 1/2″-1 3/4″

L

30-60 cm

1′-2′