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Trenching Og 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 hullene er nødvendig når grøft er dypt

Gjenta samme prosedyre for dypere saken

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 "