Page 287 - Trenchless Technology Piping Installation and Inspection

Pr oject Considerations for Pipe Replacement Methods 251

6.8.12 Permitting Issues
As for any trenchless methods, permits from all affected parties
should be secured before the start of the bursting phase. Some of
these permits could be secured by the owner and its representatives,
and the rest should be secured by the contractor. The responsibilities
for obtaining the individual permits should be outlined in the speci-
fications and stated on the drawings. Permits to burst under the road
and to modify the regular traffic flow according to the project traffic
control plan should be secured from state department of transporta-
tion (DOT) or municipality/local government having jurisdiction. If
the pipe crosses beneath a runway, taxiway, drainage ditch, irrigation
channel or canal, or railroad track, permits should be secured from
the appropriate regulating agencies and/or owners of these facilities.
Advance notices to any affected residents or businesses should take
place before the bursting operation to inform them about road clo-
sures, night or weekend work, service disruptions, driveway block-
ings, and the like, and keep them posted with the project progress
and any changes.

6.8.13 Cost Estimating
Estimating pipe-bursting projects for bidding purposes should be as
detailed as possible. For each project, the contractor should estimate
the labor, material, and equipment necessary for excavation and shor-
ing of pits, pit bottom stabilization (concrete or gravel), bursting sys-
tem setup, pipe fusion, lateral connection excavation, bypass pump-
ing, bursting, service reconnection, shaft backfill, surface restoration,
and potential dewatering. As shown in Fig. 6.7, the cost per foot of
pipe-bursting installations are less than that of open-cut in unfavor-
able (average or light traffic) situations. Figure 6.7 also shows that
that cost is less than that of open-cut in favorable (heavy traffic) con-
ditions if the depth of cut is more than 10 ft.
In addition to providing the owner with the total price of the
project to compare different bids, the bid form should provide the
owner with a mechanism for payment based on the actual quanti-
ties during construction. The unit prices in the form can also be used
to resolve disputes amicably. It is recommended that the bursting
operation be measured in linear footage and segmented by classifi-
cation or sections from manhole to manhole or from insertion to
pulling shafts. Segmentation by run or bursting class provides the
owner and the contractor with fair pricing mechanism and helps
reduce disputes. Lateral connections should be measured by the
number and type, required, indicated as separate bid items, and
segmented by depth. Cleaning, testing, and post CCTV of the new
line should also be a separate bid item. Bypass pumping can be
priced as a lump sum or estimated for each section by number of
days required.