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P. C. S. Outside Plant Consulting Services, Inc. Buried Duct Network for Upgrading Utility Cables – Recent Field Trials. 2009 AASHTO Right of Way & Utilities Subcommittee Conference Oklahoma City April 20, 2009. Dr. Lawrence M. Slavin Outside Plant Consulting Services, Inc.

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buried duct network for upgrading utility cables recent field trials

P

C

S

Outside Plant Consulting Services, Inc.

Buried Duct Network for Upgrading Utility Cables – Recent Field Trials

2009 AASHTO Right of Way & Utilities

Subcommittee Conference

Oklahoma City

April 20, 2009

Dr. Lawrence M. Slavin

Outside Plant Consulting Services, Inc.

973-983-0813

lslavin@ieee.org

www.outsideplantconsulting.com

slide2

Sponsor

  • Funding:
  • US Department of Transportation
  • Technical Oversight:
  • FHWA Turner-Fairbank Highway Research Center
slide3

Objectives & Goals

  • Short-Term:
  • Develop improved method of buried construction for utility cables (telecommunications, CATV, power)
  • Long-Term:
  • Avoid damage to roads and transportation systems
  • Minimize proliferation of utility poles
slide5

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Cable Construction Methods

  • Overhead Utility Poles
  • Below ground
    • Underground conduit
    • Direct-Buried
slide6

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cables placed directly in trench

slide7

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Direct-Buried Philosophy

  • Cables directly placed in trench
  • Robust cable designs
        • electrically insulated (power, ...)
        • waterproof
        • mechanical protection (armor, …)
  • Sized for “ultimate” future needs
slide8

Direct-Buried Philosophy

  • Typically, no convenient means of cable addition, replacement or upgrade*

* Sometimes a duct is provided in trench by a utility, but is not a uniform practice across all utilities and regions, or necessarily done in the most cost-effective manner

slide9

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Direct-Buried Philosophy

  • Does it usually work (successful) ?
  • Often (in use for several decades)
  • Does it always work ?
  • No
        • new technology
        • exhausted capacity
        • cable degradation or damage
        • new service providers
slide10

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Direct-Buried Philosophy

THUS

  • Cable additions require aggressive construction (open-cut trenching, directional drilling, …)
  • Possible damage to roads, property, utilities, ...
  • Safety hazards
slide12

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Benefits

  • For buried facilities (requiring future upgrades, maintenance, …), avoids
    • Road damage (road cuts, ...)
    • Corresponding traffic delays
    • Damage to buried lines (gas*, electric,…)
    • Damage to Intelligent Transportation System (cables, …)

* e.g., US DOT - Office of Pipeline Safety

slide13

Benefits

  • Consistent with AASHTO & FHWA Recommendations*
    • Belowground lines
    • Access and Upgradability
    • Joint Usage of Infrastructure & Facilities

* A Policy for Accommodating Utilities Within Highway Right-of-Way,

A Policy on the Accommodation of Utilities Within Freeway Right-of- Way,

Guidance on Sharing Freeway and Highway Rights-of-Way for Telecommunications,

Highway/Utility Guide.

slide14

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BDN Concept/Design

  • Hybrid system; combines
    • Advantages of underground conduit (upgradability)
    • with
    • Advantages of direct-buried construction (low cost)
slide15

BDN Concept/Design

Specify standard, optimized, cost-effective Buried Duct Network:

  • Initially installed distribution cables are selected, sized and directly-buried in joint-use trench, following present recommended (cost-effective) practices
  • Two large diameter (e.g., 4-in.) main distribution ducts, initially vacant, accessed at common handholes, also placed as an overlay in the same joint-use trench
slide16

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BDN Strategy*

  • Add minimum duct network for insurance for atypical (but not uncommon) cases when need upgrade
  • Consistent with shared/joint-usage philosophy
  • Space-efficient
  • Cost-effective
  • * Does not apply to applications that warrant full-scale underground conduit systems (e.g., banks of conduits, manholes, …)
slide17

Note: for thoroughfare application, possibly omit service lines

common (joint)

service trench

utility terminals/equipment/hardware

(power, telephony, CATV)

three individual service ducts

power

handhole

tele

CATV

common (joint)

main trench along ROW

two vacant large (e.g., 4-in.) ducts through handhole

initial distribution cables

(direct-buried, w/o duct)

initial primary power distribution cables

(direct-buried, w/o duct)

patent pending

BDN Detail

slide18

Not to Scale

6 knockouts

(both sides)

flared sides

(avoid uplift -- frost, duct, …)

lid

mouseholes

(e.g., 4-in. duct)

bottomless

patent pending

(Nominal 2 ft. wide x 3 ft. long x 36+ inches deep)

slide19

initial distribution cables

(direct buried, w/o duct)

e.g., communications (telephone, CATV)

handhole

two vacant main ducts (HDPE, PVC, …) (future distribution cables)

e.g., power (primary and/or secondary)

express duct (alternative)

cut/sealed duct

same (joint) trench

patent pending

Direct-Buried Initial Cables plus Vacant Main Ducts thru Handhole

slide20

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BDN Concept/Design

  • Main distribution ducts are initially vacant
  • Future Use of main distribution ducts efficiently allocated, as necessary (telephone, CATV, power)
  • Individual, smaller diameter, service wire ducts are routed from terminals to residence or small business, to provide protection for initial service wires, and facilitate future upgrade or replacement
slide21

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BDN Concept/Design

  • Handhole NOT intended for routine maintenance (no terminals, splices, ... ) -- avoids exposure of communications workers to high voltages
  • Accessed only if and when the need arises for future addition of cable(s)
slide23

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slide24

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slide25

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slide28

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Phase II Effort

  • Develop design, construction, maintenance, and management guidelines and practices
    • ASCE Pipeline Division
      • “ASCE Manual of Practice for Belowground Pipeline Networks for Utility Cables”
      • Anticipated availability Summer 2009
slide29

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Phase II Effort

  • Ensure availability of prototype hardware for future applications, field trials, ...
    • Handholes (load ratings, ...)
    • Ducts, conduits
    • Security system (locks, …)
    • …..
slide30

Handholes (TIER 15)

Polymer Concrete (Quazite®)

slide31

Handholes (“20K”)

HDPE

(Pencell Plastics)

slide32

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Phase II Effort

  • Arrange appropriate full-scale field trials
    • Permanent installation
    • e.g., 1 kft
    • Road, highway, residential, …
    • Identify & address various issues
    • Leverage for future introduction into utility and transportation industry practices
slide33

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Phase II Effort

  • Completed or planned field trials
    • Arlington, Texas – November 2008
    • Monroe, NC – March 2009
    • Danvers, MA – June 2009
    • ........
slide34

Monroe, NC

  • Road Widening SR1223 (NCDOT)
    • Moving Verizon and Time Warner Cable
    • Outer edge of ROW
    • Tier 15 handholes (NC DOT)
    • Open-cut trenching
    • Conventional PVC (adhesive joints)
    • 1 kft (<800 ft.)
    • Conduits (and innerduct) for future (and initial) cables
slide35

Monroe, NC

Thanks, Gus !

slide36

Handhole Locations for Verizon BDN /Time Warner Installation (Monroe, NC)

30” x 48” x 36-in deep handholes

(Quazite PG3048)

36” width trench

Verizon equipment/pedestal

 390 ft.

 330 ft.

two 4-in. conduits

(e.g., Schedule 40 PVC)

2 Time Warner Cable innerducts

(outside handholes)

Time Warner Cable mini-vault

increase trench width in vicinity of handholes

initial Verizon cables through one conduit

All conduits plugged at all exposed ends

Not to Scale

slide37

Trench Cross-Section for Verizon BDN /Time Warner Cable Installation (Monroe, NC)

surface

two 4” (Verizon) conduits

pull rope

 36”

fiber cable + pull rope

fiber cable + 600 pr copper cable (+ vacant path ?)

36”+

two 2” (Time Warner Cable) innerducts,

including tracer wire

Not to Scale

slide47

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Phase II Effort

  • Implementation issues
    • Ownership
    • Joint-usage agreements (compensation, …)
    • Road and construction permits
    • ...
slide48

HOW

YOU

CAN

HELP

slide49

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How You Can Help (Permits, ...)

  • Encourage (require ?) use of upgradable networks (BDN, other, ...)
  • Stricter specifications
  • Uniformity (across states, ...)
slide50

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How You Can Help (Permits, ...)

  • Suggestions
  • Existing related efforts ?
    • Individual states ?
    • Nationally ?
  • How to proceed ?
  • .......
slide51

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Thank You !