Installation Sequence for the Off-Highway Vehicle (OHV) Elevated Boardwalk
The following steps illustrate the installation process.
Step 1—The OHV elevated boardwalk is installed during a dry
period while
accessibility for equipment is good.
The first step requires removing the
existing deteriorated boardwalk.
Step 2—Helical piles are installed using a mini-excavator
with a special screw
head and hydraulics. The contractor
installed
90
helical piles at an average depth
of 10 feet over
3
long work
days.
Helical piles are installed both vertically
and
at
an angle.
The
direction
of the angled piles
alternates
between bents
for lateral
bracing purposes.
Step 3—Galvanized steel brackets are used for lateral bracing.
Step 4—Galvanized steel saddle brackets attach to the helical
piles and
header beams to form a bent.
Step 5—Header beams fastened to vertical and diagonal helical
piles provide
both support and lateral stability.
Step 6—Stringers are set in place and attached to the
header
beams.
Step 7—Stringers are carefully placed on header beams and
Simpson Strong-Tie metal components are
used to join members.
Step 8—Bracing is added between the stringers to prevent the
stringers from
rotating.
Step 9—Curbing (6 inch by 6 inch or 4 inch by 4 inch,
depending on the
width of maintenance equipment using
the boardwalk)
on top of scupper
blocks is specified in
lieu of railings for this OHV trail.
Step 10—Backwall planks installed at the end of the boardwalk
keep dirt
from sloughing between the beams and prevent
moisture
from wicking into
the ends of the beams.
Step 11—Masonry block pavers at the boardwalk approaches
provide a firm
transition from the trail to the boardwalk and
minimize soil settlement.
Step 12—A closer view of the Percstone Pavers used in
the installation.
-Continued-
