Mill Creek Central
Trestle - Installing Beams I
9/06/2006, last updated
This page describes the process of
getting the beams onto the towers 1 through 4. The installation of
the remaining beams is described the Installing Beams II page.
|We also use the backhoe to transport the beams from the
trestle fabrication area to trestle site. This beam goes between
tower 1 and tower 2. The ends are wrapped with carpet (held in
place by duct tape) to protect the beam and tower paint.
|Dan Staron and Nelson are manning the winches to pull up
the beam. The backhoe set the beam down with the north end between
towers 1 and 2. The winches were able to pull it up hill about
ten feet until it was centered between towers 1 and 2 and then lift it up
the side of the towers.
The Jin-poles & winches worked great in that the beam was stable and
we could work as fast as we wanted. (It was a bit exhausting for the old
guy who was on the taller tower. Next time he'll know to pick the
|The beam slid in place perfectly. We removed the
carpet pieces and clamped it down.
The photo above shows the pair of beams
installed between towers 1 and 2. We were able to get the second
beam up in about 45 minutes; the process is slick. Note that the Jin-pole angle has
been reversed from the previous photos. We can do that by using a different hole for the lower bolt on the pole. The
pole was left on tower 1 to be used to install the beams between tower 1 and
the north abutment. The pole was left on tower 2 to be used to
install the beams between towers 2 and 3.
Photo above shows the side view of the
first set of beams.
This is the trestle fabrication area
with two pair of beams being readied. All the holes have been
drilled. A couple of the beams need the ends cut off (we'll
wait of for one of the experts to do that). We'll then paint
them before installation.
The beams between towers 2 and 3 were
hoisted next using the Jin-poles and hand winches. This
time the backhoe could be positioned between tower 2 and tower 3 and lift
the beam part way thus reducing the manual effort. Photo above
shows the three spans.
|This is an end view of the beams on
the three spans. The beams are clamped to the top of the tower
but need to be shimmed and have tie plates bolted between ends of the
adjacent beams. Angles must also be bolted between the parallel
beams at each joint to maintain proper spacing. The beams will
be aligned at the time this hardware is added.
|Denny and Jim Norris took a few
minutes to remind us that building a trestle is fun.
|Dick persuaded Clee Streets to trim
a few braches from the backhoe bucket
|The tree was trimmed to create this
view. No sense in hiding your sign behind a tree.
Status October 13, 2006: We
have another pair of I beams up for a total of 4 spans ---- we're half
way across. Photo above shows the trestle from the east side. The
trees are loosing leaves so the south end is less hidden. The leaves
will be gone about the time we get the last spans up ----- good
The photo on right shows the view
from the south abutment.
The thing sticking up is one
of the Jin-poles covered with plastic. One of the manual winches
became difficult to use when the previous beams were installed.
That manual winch was replaced with an electric winch hence the cover.
This is a good spot to break. The
installation of the remaining beams is described in the