Figure 5-48.Sand cup and auger used with flexible steel rods.
mind that once the water is turned on, any lines
connected will receive high-pressure water. We do not
want to turn water closets and lavatories into cool
water geysers or bidets.
In routine sewer cleaning, the usual way is by
putting a tool through the line to indicate a clean sewer,
by removing partial obstructions, or by determining
the necessity for a detailed job, such as grease removal,
root cutting, or sand removal.
Sectional wooden sewer rods, to which a variety of
end tools may be attached, have been used in sewer
cleaning for many years. End tools for piercing an
obstruction first, and cutters and scrapers for root and
grease removal are available. Rods are pushed into the
sewer from the bottom of a manhole. A device, as
shown in figure 5-49, is useful for pushing the rods.
Wooden rods are useful for stringing a cable through a
partially obstructed sewer.
Another method of sewer cleaning is to use
lightweight, spring-steel sectional rods coupled into a
continuous line with several types of augers and sand
cups as end tools (fig. 5-50). The tool and rod are fed
into the sewer until the obstruction is reached; then the
obstruction is removed by the following methods-by
twisting the rod by hand, by using a small gasoline
engine, or by an electric motor drive unit.
When using power-driven equipment, ensure
that it is maintained under the manufacturers
Flushing methods described in the previous
section remove all but heavy sand deposits.
Accumulated sand and grit dislocated by flushing
should be removed from the sewer at a manhole. A
sand trap, made from a stovepipe ell and sheet metal to
Figure 5-49.Pushing device for wooden sewer rod.