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By N2H

Zone Demolishing

(1) Staggered Arrangement (Pillar)

d

38-44 mm

1 1/2″-1 3/4″

L

30-40 cm

1′-1′4″

D

90% of Width or Height

(2) X Figure Arrangement (Pillar, Wall)

d

38-44 mm

1 1/2″-1 3/4″

L

30-40 cm

1′-1′4″

D

90% of Width or Height

(3) Cross Drilling (Beam)

d

38-44 mm

1 1/2″-1 3/4″

L

30-40 cm

1′-1′4″

D

90% of Width or Height