Building piers for the concrete arch railroad bridges
continued by adding the 'arches' between the piers.
This step was
basically done in five operations: 1) install and secure pre made
wooden arch forms between the existing piers. 2) Build a wooden base
between and connected to the existing piers, 2) Build a wooden floor or
base on top of the arch forms, 3) add and secure wooden walls, called
spandrel walls, on top of the base, 4) build and attach to the base and
walls the inner forms for space to fill with soil and gravel on which
to lay the cross ties and steel track, and 5) After pouring and
hardening these wooden forms would be removed and most likely reused at
another location. Steps four and five are often not shown in photos.
These five steps were the same along the project, but the mixing and
pouring of the concrete varied.
Above is a close-up view of traveling
plant's track and the mixer drum in the upper right corner. Concrete
mixed and poured as the mixer slowly moved across the forms on tracks
attached outside of the entire setup. It straddles the wooden form
structure and mixes, pours and moves along the structure.
This concludes the presentation of construction railbeds. Now for a look at some of the equipment used in construction.
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