Page 97 - Trenchless Technology Piping Installation and Inspection

64 Cha pte r T w o

Winch Compressor

Existing
pipe New
Winch line Pneumatic pipe Expander PE pipe
cone
bursting tool

FIGURE 2.13 Pneumatic pipe bursting method. (Source: TT Technologies.)

ASCE Manual of Practice on Pipe Bursting Projects (MOP
No. 112) provides a full description of pipe bursting method and
different existing and new pipe applications.

Pipe Removal
Pipe removal, also known as pipe eating, can be performed by use of
a horizontal directional drilling (HDD) rig, a horizontal auger boring
(HAB) machine or a modified microtunnel boring machine (MTBM).
In this method the existing pipe is broken into small pieces and taken
out of ground by means of slurry (in HDD or MTBM method) or
auger (in HAB method).

2.4 Sample Decision Support Systems
for Gravity and Pressure Pipes
Considering the project requirements and capabilities and limitations
of available trenchless renewal and replacement methods, Figs. 2.14
and 2.15 illustrate sample decision support systems that can be used
for gravity and pressure pipes, respectively. The reason to use a deci-
sion support system is to optimize the method-selection process
based on the requirements of the project and priorities set by the
project owner. No textbook or software program can make a proper