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?


Manhole Defects


Manhole Defects (cont.)


Why Renew Manholes?

Keep small defects from becoming BIG problems!


• 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


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


Decision

Support Tool

Manhole Rehabilitation Material Classification

Experiments FEM

Expert Workshop

Literature Search

Case Studies

Project Process Flow Chart


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


Main Test Participants


Pipe Cleaning and Preparation


Lining Process


Main Tests (Stress vs. Strain)


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


Finite Element Model (FEM) cont.


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


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


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)



(steel reinforced)

(steel reinforced)



Cementitious

lining (thick)

Cured-in-place

polymers (thick)

Manhole Rehab Classification - Final


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!


Manhole Rehab Cost


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


Intro


Manhole ID


Manhole Condition - Cover


Collapse


Deformed


Hole


Offset Joint


Fracture


Crack


Surface Roughness


Infiltration


Brickwork


Roots


Summary


Groundwater - Cover


Groundwater Properties


Groundwater Summary


Soil Properties - Cover


Soil Properties


Soil Properties - Classification


Soil Properties - Summary


Loads - Cover


Soil Composition


Traffic Loads


Earthquake/Flood Zone


Loads Summary


Location - Cover


Location Details


Results


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


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


Contact Information

V. Firat Sever, Ph.D., P.E.

American Structurepoint

(P): 614-901-2235

[email protected]

Mohammad Najafi, Ph.D., P.E., F. ASCE

Director, CUIRE

(P): 817-272-9177

[email protected]

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...

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