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Do not over-tighten the bolts so as to dent the
base frame.
Ensure wood depth is sufficient.
Ensure earth anchor is set correctly by conducting a
pull test per the earth anchor’s capacity.
CAUTION
CAUTION
CAUTION
CAUTION
WOOD BEAM
WASHER
LAG BOLT
BASE
FRAME
Figure 3-5. Base Frame Anchoring, Lag Bolts
Figure 3-7. Duckbill Earth Anchor Tensioning
3-3.3. LAG BOLTS
3-3.4. EARTH ANCHORS
GROUND OR ASPHALT
DRIVE ROD
DUCKBILL
EARTH
ANCHOR
CABLE
Figure 3-6. Duckbill Earth Anchor Installation
Use earth anchors if the building is anchored to ground, asphalt, or
wood and additional uplift resistance is required. After anchoring the
base frame, secure the base frame at the arch stubs using the earth
anchors.
Insert a drive rod into anchor, to the inside of the base frame, next to
the arch stubs. Drive into ground as far as possible. Make sure the
anchor is driven into the ground far enough, leaving just enough cable
to loop around the arch stub tight against the base.
Remove drive rod and pull up on the cable to turn anchor sideways
below ground as shown (Figure 3-6).
Wrap the cable around the arch stub and secure with (2) ¼" cable
clamps (Figure 3-7).
Use lag bolts only when anchoring the building to a wood foundation.
Ensure the wooden beams are fully secured to the ground.
Drill a pilot hole into the wood foundation at each anchor hole location
to prevent the wood from splitting.
Insert the lag bolt with a flat washer and tighten the bolt (Figure 3-5).
If lag bolts are used, it is necessary to install earth anchors to resist
uplift (see 3-3.4. Earth Anchor Installation).
