Page 358 - Trenchless Technology Piping Installation and Inspection

308 Cha pte r Ei g h t

FIGURE 8.1 Conventional pipe jacking. (Source: Akkerman, Inc.)

and polymer concrete (PCP) are the most common types of pipe used
in pipe jacking.

Allowable Forces
Pipe to be jacked must be specifically designed by the pipe manufac-
turer with sufficient reinforcing and wall thickness to resist, without
buckling or crushing, the horizontal, vertical, and longitudinal loads
applied to it during the jacking operating.

Pipe Dimensions
1. The minimum diameter for a pipe installed by pipe jacking
must be 42 in. OD or 36 in. ID, as the method requires people
working inside the jacking pipe. Although no theoretical
maximum size limit is specified, the most common diameter
ranges from 48 to 72 in., with the largest being approximately
12 ft in diameter.
2. Steel pipe must have a minimum wall thickness of 0.25 in. or
as specified in the current DOT standard specifications for
construction, whichever is larger. Concrete pipe must have a
minimum wall thickness as specified in current DOT stand-
ard specifications for construction. Likewise, CCFRPM and
PCP must have similar minimum wall thickness specifica-
tions. See the specific pipe manufacturer’s literature for more
information.