Page 346 - Moving the Earth_ The Workbook of Excavation
P. 346
ROADWAYS
8.8 THE WORK
FIGURE 8.4 Stakes for cut.
When heavy cuts and fills are required, most of the work may be done with guidance of only
slope stakes, both the originals and others that are set up or down the slopes as work progresses.
(See Fig. 8.5.)
When the working levels approach the subgrade, additional stakes are needed. Centerline stakes
will be restored, and lines of shoulders and gutters may be staked.
Finishing may be done with blue tops, which are stakes driven until the tops are at the grade
desired, usually subgrade, and/or string on shoulder stakes.
Centerline. The centerline is usually staked at 100-foot intervals in preliminary work, and some-
times as closely as every 25 feet in narrow, winding roads or in finishing operations.
These stakes are called stations. The first one, the zero station, is at the beginning of the road
or other project. The distance in feet from zero is marked as a double figure.
Stakes at 100-foot intervals are called full stations, others are called plus stations. Station numbers
are made up of the distance from zero, with the hundreds divided from the last two figures by a
FIGURE 8.5 Stakes for fill.
