The first step in construction was to repaint the centerline and mark the position of
each of the two foundation holes that would support the base. With a rented power
auger, it took about three hours to drill all of the holes. The post holes are 2 to 3 feet
deep because of the soft ground. The concrete footings were cast in place. First, the
forms were positioned over the holes. Rebar was added and foundation bolts were
positioned to hold the bents in place. In the photo above, the form has been positioned
and marked with blue paint. The next one has had the grass removed, positioned,
leveled and staked in place ready for concrete. The third footing was poured the day
before. It has been stripped of its form (the forms are reused) and left to cure. I
poured two footings at a time with a total of 13 single footings for the trestle, two
double footings for the bridge and two end wall footings. The tops of the single
footings are 49 inches long and 4½ inches wide. The sides slant outward at about a
15% angle. Slanting the sides gives a better “look” and allows the form to be easily
removed. They support a bent with a 4 foot long base. On the curve, the forms were
elevated ½ inch on the outside for superelevation. I did this so that I could build
bents with the top beam parallel to the bottom.
|Footings: A double wide form (left) and a single wide form are positioned for concrete.
|Click on photo to enlarge.
|North Pacific Coast Railroad
|Bridge and Trestle Construction
|This material is provided for personal use only - all rights reserved. 2007