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Laser Method of Laying Pipe - 14070_219
Figure  10-23.Handhole. - 14070_221

Engineering Aid 1 - Advanced Structural engineering guide book
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measured to the elevation prescribed for the bottom of the duct, plus the thickness of the concrete encase- ment, if any. In an underground power system, the bottom of the manhole is usually about 2 feet below the  bottoms  of  the  incoming  and  outgoing  ducts. Power and communications manholes are often com- bined;  figure  10-22  shows  plan  and  section  views  of  a combination power and communications manhole. Conduit   and   cable   connections   to   buildings, street-lighting  systems,  traffic  light  systems,  and the  like,  are  low-voltage  secondary  lines.  Duct connections from main-line manholes run to small- subsurface  openings  called  handholes  on the sec- ondary line. The handhole contains connections for takeoff to the consumer outlet. Figure 10-23 shows plan  and  section  views  of  a  handhole. Construction Sheets Several construction situations have been men- tioned in which line and grade for construction are obtained from a line (or perhaps from two lines) of Figure 10-22.—Combination power and communication manhole. 10-22







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