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DESIGN FOR ROCK
DESIGN FOR CONCRETE
MIXING AND FLLING
TIPES
SAFETY PRECATION
 
how to use > DESIGN FOR ROCK > TRENCHING AND TUNNELING

d

44-51 mm

1 3/4-2

L

30-40 cm

1’-1’4

D

60-90 cm

2’-3’

 

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’

 
   
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