OWEA Collection Systems Workshop 2017 SAME PROBLEM, … · A M E R I C A N S T R U C T U R E P O I...
Transcript of OWEA Collection Systems Workshop 2017 SAME PROBLEM, … · A M E R I C A N S T R U C T U R E P O I...
A M E R I C A N S T R U C T U R E P O I N T
SAME PROBLEM, MANY OPTIONS OWEA Collection Systems Workshop 2017
V. Firat Sever, PhD, PE, BCEEAMERICAN STRUCTUREPOINT, INC.
Mohammad Najafi, PhD, PEUNIVERSITY OF TEXAS AT ARLINGTON/CUIRE
Walter GrafWATER ENVIRONMENT RESEARCH FOUNDATION
HOW TO MAKE A DECISION ON MANHOLE REHABILITATION?
A M E R I C A N S T R U C T U R E P O I N T
Why Renew Manholes?
Keep small defects from becoming BIG problems!
A M E R I C A N S T R U C T U R E P O I N T
• Over 20 million existing manholes in the US
• 4 million are over 50 years old
• Over 5 million are 30-50 years old
• Current expenditures are at $100 million/year
• Projected annual expenditures estimated at $500 million
Source: Permaform
Manhole Rehabilitation Market
A M E R I C A N S T R U C T U R E P O I N T
1. Classify manhole rehabilitation materials and methods based on their structural capabilities.
2. Develop a user-friendly decision support tool to help utilities and engineers select the most suitable method and prepare technical specifications for manhole rehabilitation.
Project Objectives
A M E R I C A N S T R U C T U R E P O I N T
Decision
Support Tool
Manhole Rehabilitation Material Classification
Experiments FEM
Expert Workshop
Literature Search
Case Studies
Project Process Flow Chart
A M E R I C A N S T R U C T U R E P O I N T
Expert Workshop
• Various views on what is
“structural”
• Consensus on a need for definition
and standardization
• ASTM standard – task force
• Previous studies
• Full scale versus specimen testing
• Decision support tool
contents/logic
A M E R I C A N S T R U C T U R E P O I N T
Finite Element Model (FEM)
• Complete crushing test simulation on bare and lined samples
• Full-scale manhole modeling
• Full-scale manhole simulation with thinner wall
• Full-scale manhole simulation with deteriorated substrate (i.e. lower modulus of elasticity due to material degradation)
• Simulation for hydrostatic pressure on liner
A M E R I C A N S T R U C T U R E P O I N T
Case Histories - Participants
• Metropolitan Water Reclamation District of Greater Chicago
• Sewerage and Water Board of New Orleans (MWH)
• City of Rowlett, TX
• Village of Palmyra, IL
• Johnson County, KS (two case histories)
• Orange County Sanitation District, CA
• New Lenox, IL
• Anchorage Water and Wastewater Utility, AK
• New Castle County, DE (ARCADIS)
• Sarasota County, FL
A M E R I C A N S T R U C T U R E P O I N T
Manhole Rehab Classification - Initial
Manhole Rehabilitation Materials
Structural (Class A) Semi-structural (Class B) Non-structural (Class C)
Polymer
Concrete
Fiber
reinforced
cement
Thick applied
cured-in-place
polymers
Thin applied
cured-in-place
polymers
Cementitious
linings
Fiberglass
composite
inserts
Fiber
reinforced
cement
Thick applied
cured-in-place
polymers
Thin applied
cured-in-place
polymers
Cementitious
linings
Cast-in-
place
concrete
Cast-in-place
concrete
Partial rehabilitation to stop
I&I (e.g. chimney linings,
grout sealants)
Cured-in-place (CIP)
polymeric composites Cured-in-place (CIP)
polymeric composites
Polymer
Concrete
A M E R I C A N S T R U C T U R E P O I N T
Manhole Rehabilitation Materials
Structural (Class A) Semi-structural (Class B) Non-structural (Class C)
Polymer
Concrete
Cured-in-place
polymers (medium)
Cementitious
lining (medium)
Fiberglass
composite
inserts
Cured-in-place
polymers (thin)
Cementitious
linings (thin)
Thermoplastic
Sheets
Partial rehabilitation to stop
I&I (e.g. chimney linings,
grout sealants)
Cured-in-place (CIP)
polymeric composites
(steel reinforced)
(steel reinforced)
Cured-in-place (CIP)
polymeric composites
Cementitious
lining (thick)
Cured-in-place
polymers (thick)
Manhole Rehab Classification - Final
A M E R I C A N S T R U C T U R E P O I N T
Decision Support Tool (DST)
Enter MH condition
Enter soil properties
Enter groundwater
properties
Enter loads
Enter location information
Acceptable Structural Class and Materials
Acceptable Methods
Acceptable Classes, Materials, and
Rehabilitation Methods
Prepare technical
specification
Groundwater present?
Select the option with the lowest
price
Yes
No
Decision
Support Tool
ends here!
A M E R I C A N S T R U C T U R E P O I N T
MH Condition Data Entry Tool Structural Class/Rehab Material Rating
Enter the Number of Defects in the Next Column # of Defects Severity
Collapse (X) Skip to next item if zero. Terminate the DST if manhole has collapsed. Replace the manhole.
(#)
Deformed (D)
(Severity as %) Add 1 point for every percentage point of deformation. Terminate the DST if > 50 %. Replace the manhole.
Hole (H)
(#, severity as the longest dimension of the
opening in inches) Multiply longest hole dimension by number of holes and as points. Terminate the structural class selection, and use Class A inserts if hole size > 5 inches
Joint Offset (JO)
(#, severity as the offset distance between
manhole elements (i.e. bench, cylinder, cone,
chimney, and frame) Add [(severity) x 10 x #]. Terminate the structural class selection, and use Class A if any offset distance > 3 inches. Open cut repair or replacement if offset distance > 5 inches.
Fracture
(#, severity as the length of fracture in inches)
Longitudinal (FL) Add [(25) x (#) x (severity)]
Circumferential (FC) Add [(25) x (#) x (severity)]
Multiple (FM) Add [(25) x (#) x (severity)]
Spiral (FS) Add [(25) x (#) x (severity)]
Crack
(#, severity as the length of fracture in inches)
Longitudinal (CL) Add [(10) x (#) x (severity)]
Circumferential (CC) Add [(10) x (#) x (severity)]
DST Algorithm ComponentsMH Condition Data Entry Tool Structural Class/Rehab Material Rating
Enter the Number of Defects in the Next Column # of Defects Severity
Surface Damage (Corrosion)
Enter 1 in the # field if surface damage present
Surface Roughness Increased (SRI) Add 25 if present
Surface Damage Aggregate Visible (SAV) Add 50 if present
Surface Damage Aggregate Projecting (SAP) Add 100 if present
Surface Damage Reinforcement Visible (SRV) Add 150 if present
Surface Damage Reinforcement Projecting (SRP) Add 200 if present
Surface Damage Missing Wall (SMW) Terminate the DST if present. Use Class A insert or replace the manhole.
Surface Damage Surface Spalling (SSS) Add 50 if present
Infiltration
Enter 1 in the # field if infiltration present
Infiltration Weeper (IW) Add 10 if present
Infiltration Dripper (ID) Add 15 if present
Infiltration Runner (IR) Add 25 if present
Infiltration Gusher (IG) Add 50 if present
Brickwork
Enter 1 in the # field if missing brickwork present
Missing Brickwork (MB) Add 25 if present
Displaced Brickwork (DB) Add 25 if present
Mortar Missing (MM) Add 50 if present
Roots
Enter 1 in the # field if roots present
Roots Fine (RF) Add 10 if present
Roots Medium (RM) Add 20 if present
A M E R I C A N S T R U C T U R E P O I N T
More to Explore
• EPA/WERF INFR1R12 – Structural Capabilities of No-Dig Manhole
Rehabilitation
• WERF – Strategic Asset Management www.werf.org/sam
• WERF Research Forum
• WERF Laterals
• WEFTEC
• Trenchless Technology Magazine (February 2013, December 2013)
• ASCE Pipelines 2013 Proceedings
• NASSCO Course on Manhole Rehabilitation
• ASCE Manual on Manhole Rehabilitation
• ASCE Journal of Pipeline Systems – Engineering and Practice
A M E R I C A N S T R U C T U R E P O I N T
Acknowledgement
• USEPA/WERF – Innovation and Research for Water Infrastructure for 21st Century
• Walter Graf (WERF Program Director)
• WERF Project Subcommittee – Dr. Bert Bosseler, Dr. Ersin Kasirga, and Dan Murray
• Innovative Infrastructure Research Council
• John Calise (deceased)
• Reginald Benton
• Dr. Xinbao Yu
A M E R I C A N S T R U C T U R E P O I N T
Contact Information
V. Firat Sever, Ph.D., P.E.
American Structurepoint
(P): 614-901-2235
Mohammad Najafi, Ph.D., P.E., F. ASCE
Director, CUIRE
(P): 817-272-9177