COnstruction iNterference COst Reduction Demonstration
– CONCORD –
Professional Training Sessions On:
“Trenchless Technology Solutions”
Chapter 6 - Conclusions
The Urban Utility Center
Mr. Robert Zlokovitz
Senior Research Advisor
Professor Ilan Juran
Executive Director
With the participation of:
Adrian Sanz, Berengere Sixta, Caroline Jasseron and Carolyn Zakaim - Research Fellows
Submitted to ITAC
Inter-agency Technology Assessment Committee
ConEdison NYCDEP
NYCDDC Keyspan Energy
February 2005
Conclusion
• To Meet The Economic Challenges
Of New York City
Conclusion
Cost Effective
ðlittle site restoration required
ðlow labor requirements
ðminimal customer inconvenience
ðAs the infrastructures ages and deteriorates,
the costs to repair or replace them increases
ðNew innovative solutions and technologies
must be developed or discovered
ðTrenchless Technologies are ideally suited
to Water Mains installation and rehabilitation?
Chapter 6 - Conclusions
Trenchless Technologies
Expeditious To Minimize
ðroad/lane closures
ðreduce traffic congestion
Environmental Friendly
ðreduce environmental construction hazards
ðreduce noise and air quality impacts
1
Study of Water Main
Breaks
• A study conducted for the US Army
Corps of Engineers shows that:
ðThe
system is not wearing out due to age
ðNo evidence to show that the pipe material is
deteriorating with age
ðSmall diameter pipes have the highest break rate
ðLeaks may be the most important factor causing
main breaks
ðLocation may be the most important factor to
predicting main breaks
Getting started
Study of Water Main
Breaks
• Recommendations
ðA program to replace all 6, 8, and 12-inch mains
laid prior to 1870
ðA $2 million per year leak detection programs as
a break prevention measure
• Signifiance
ðTrenchless Technologies that are effective in
eliminating leakage will also be effective in reducing
main breakage
Typical Water Main Problems
• Evaluating the Alternatives
ðSelecting the optimal solution for a specific
Problem
Typical Consequences
Lowest Cost
Commercial
Solutions
problem is a complex process involving both
technical and economic considerations
Mild Internal
Corrosion And
Tuberculation
Poor Water Quality And
Flow Restriction
Cement Or Epoxy
Spray Lining
Severe Internal
Corrosion
As Above Plus Leakage
And Structural Failure
Thin PE Hose And
Cipp Liners (PRP)
Joint Failure
Leakage
Thin PE Hose And
Cipp Liners
Localized External
Corrosion
Leakage And Localized
Structural Failure
PRP Thick PE (Thin
PE Hose And CIPP
Liners In Some Cases)
Extensive External
Corrosion
Major And Extensive
Structural Failure
PRP Thick PE
ðPoints to be carefully assessed:
–
–
–
–
–
–
–
Materials and geometry of the water main
The length of time the main can be taken out of service
Size, pressure, capacity
History of technology
Structural potential, construction access and disruption
Availability of materials and capability of contractors
Cost per linear foot of each option
Chapter 6 - Conclusions
2
Techniques To Resolve
Structural Problems
Techniques To Resolve Flow, Pressure
and Leakage Problems
Pipe Has Structural Problems
Pipe Has Poor Flow/Pressure and/or Excessive Leakage Problems
Renovation would not preserve
Renovation would preserve
structural integrity of pipe
structural integrity of pipe
Pipe does not have structural problems
Adequate
hydraulic
performance
Inadequate
hydraulic
performance
Adequate
hydraulic
performance
Inadequate
hydraulic
performance
Many connections?
Many connections?
Many connections?
Many connections?
Easy excavation?
Easy excavation?
Easy excavation?
Easy excavation?
Easy restoration?
Easy restoration?
Easy restoration?
Easy restoration?
Low social disruption?
Low social disruption?
Low social disruption?
Low social disruption?
Inadequate
hydraulic
performance
Many connections?
Easy excavation?
Easy restoration?
Low social disruption?
Yes to any
Yes to any
R(C)
No to all
R(C)
R(PB)
R(SL) L(4)
Yes to any
R(C)
No to all
R(C)
R(PB)
Yes to any
R(C)
No to all
R(C)
R(PB)
Yes to any
R(C)
Adequate
hydraulic
performance
R(C)
No to all
R(C)
R(PB)
No to all
R(C)
R(PB)
R(SL) L(4)
L(2/3)
Excessive leakage
No excessive leakage
Many connections?
Easy excavation?
Easy restoration?
Low social disruption?
Aggressive/soft water?
Yes to any
No to all
R(C)
Joint seals
Joint seals
R(C) R(PB)
R(SL) L(4)
Yes to any
No to all
Ciment lining
Epoxy lining
Epoxy lining
Social CostConclusion
Social Cost
•
The diversion of existing facilities (gas, electric, telephone) from
adjacent excavation is the responsibility of:
TOTAL COSTS
UK & All Other US
Cities
=
DIRECT COSTS
+
INDIRECT COSTS
+
SOCIAL COSTS
New York City
The gas, electric
and telephone
utilities
Must relocate or protect their
facilities when interfering with sewer
or water construction projects
The municipality,
installing sewers
or water mains
¼
•Design
•Damage to adjacent property
Environmental loss
(noise, vibration, air
pollution)
Cost to the private utilities
•Contracting cost
•Diversion of existing facilities
•Loss of amenity
•Permanent reinstatement
•Reduction in road pavement life
•Disruption to traffic
= indirect cost to the City
Residents
•Professional charges
•Increase in road maintenance
requirements
•Increased levels of
traffic accidents
•Planning
•Labor, materials
Chapter 6 - Conclusions
•Disruption to businesses
º
Utilization of construction methods that reduce the total cost, & improve
quality of life
Trenchless technologies
º
3
Definition of total project cost
Best Practice in the Use of Trenchless
Technology
Social Costs
§
According to a study of Jason Consultants,
1992) social costs may be three times as
much as construction cost
Breakdown of cost
Social Cost
Interference cost
Construction cost
Trench Method
Trenchless Technology
NYC Franchise Agreement
• Concept
– Engineering solutions based on trenched or
trenchless methods will lead to quite different
solutions
– Trenchless methods generally require
additional planning
• Design
– The benefits that can be gained for the client
& the community by the use of trenchless
technologies can be optimized by proper
selection and planning
Decision making process
A NYC Franchise Agreement covers every company
that own an underground network in New York city.
•Decision making policy and
responsibilities
• Utilities rent the ground they use for their network at
a symbolic price
•Site evaluation & design
requirements
• Utilities are obligated to maintain their service
anytime even when the city works on it’s own
network
•Stakeholders’ involvement and
influence on decision making process
• Utilities pay the Interference Costs for their facilities
•Assessment of alternative solutions
Chapter 6 - Conclusions
4
Contractual frameworks for Trenching
and Trench-less Solutions
• Incentives for Trenchless solution
available
• Bonus/penalties system on time
schedule program calculate with the city
Social Cost program
• Importance of the Time factor within the
contracts
• Sole source issue
Polyethylene Pipe for Water Application
PE pipe is:
Interference Management Practice
1. Joint bidding
2. Section U
Trenchless Solutions For Water
Mains
• Relining systems
•
Available in any length that can be conveniently handled
– Sliplining
– Modified PE liners (rolldown , swagelining, subline)
– Cured in place liners (paltem, insituform PPL,
•
Very flexible, so it is ideal for use in hilly terrain, for
installation around curves, and in areas with potential
seismic activity
– Spray lining
•
Protected against degradation by addition of stabilizers and
carbon black
thermopipe , starline)
• On line replacement
– Pipe bursting /Pipe splitting (Consplit, Pim)
• CI internal sealing
PE pipe is IDEAL FOR WATER APPLICATION!
Chapter 6 - Conclusions
– Weko seal
– In-weg
– Link pipe
5
QA/QC Program
• Quality Project
ðSuccessful completion at an appropriate
cost which meets the customer’s expectations
• For the Rehabilitation Industry to Continue to
Grow and Reduce Failures
ðIt must embrace the concept of
performance specifications with written
QA/QC programs
Chapter 6 - Conclusions
6