Topcon mmGPS 3D Paver, Reference Manual

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2D Paving Applications
mmGPS 3D Paver Reference Manual
6-18
Paving City Streets with Cross
Slope
Another option is to pave the street using cross slope and sonic
control. The tracker is positioned over the lip of the gutter on one side
and cross slope is dialed in for the crown on the other. This method
may have to be modified due to the fact that in many cases, the curbs
may be poured at different elevations on either side of the street. Even
though the curb was poured out of tolerance, it may have passed
inspection and the asphalt needs to match the curb and gutter. If the
curbs are at different elevations, it is impossible to pave a typical
design slope on both sides of the street.
A cross section design of a 36 foot wide street with a 2.0% slope
produces a .36 foot rise at centerline (Figure 6-19).
Figure 6-19. Paving with Cross Slope
If the curbs are at different elevations, a .36 foot rise at centerline
produces incorrect slopes (Figure 6-20).
Figure 6-20. Curbs with Different Elevations
.36'RISE
CL
36.0'
2.0%
2.0%
.36'RISE
CL
36.0'
1.7%
2.3%