utility tunnel master planning for the future - ncappa€¦ · •university utility tunnel system...

Utility Tunnel Master Planning

for the Future

NC APPA - 2013

• University Utility Tunnel System Overview

• Utility Tunnel System Improvement Planning –

1990’S to 2008

• University Avenue Emergency Tunnel

Repair/Master Plan Update

• Utility Tunnel System Improvement Planning –

2008 to Present

AGENDA

2 | Utility Tunnel Master Planning for the Future May 2013

• Mark Roach – University of Virginia, Associate

Director of Utilities Department

• Robert “Skip” Notte, PE, LEED AP – Associate

Vice President, UVA Client Manager (1999-

2010), Dewberry

• Devin Keeler, PE, LEED AP, SIT, CST-III – UVA

Client Manager (2010 – Present), Dewberry

• Emmett Simons, PE – Associate, Structural

Engineering Design Lead, Dewberry

Presenters


• The University of

Virginia was Founded in

1819 by Thomas

Jefferson in

Charlottesville, Virginia.

• As of 2012, the

University supports

approximately 12,420

staff, 14,640

undergraduates, and

6,455 postgraduates on

Grounds.

UNIVERSITY UTILITY TUNNEL SYSTEM OVERVIEW


• The University supports

over 550 buildings with

over 16 million gross

square feet (GSF).

• Many of the buildings

are serviced by central

utilities conveyed

through a network of

tunnels.



• Archive documents indicate

that the first utility tunnel

was constructed around

1895.

• There is approximately 6.5

miles of walk-thru tunnel,

box conduit and other

buried structures carrying

central utilities on Grounds.

• Approximately 4.1 miles is

active walk-thru tunnel.



7 | Utility Tunnel Master Panning for the Future May 2013


Tunnel

Box Conduit South West Quadrant

N

• The walk-thru tunnels vary

in size and cross-sectional

geometry.

• The walk-thru tunnels carry

multiple utilities including:

steam, pumped condensate,

medium temperature hot

water, low temperature hot

water, domestic hot water,

potable water, fire water,

telecom, and electrical.



• In 1998 the Director of

Energy and Utilities

completed a visual

inspection of the entire

walk-through utility tunnel

system.

• This inspection included

a recommendation to

complete the first tunnel

conditions and

assessment report.


UTILITY TUNNEL SYSTEM IMPROVEMENT PLANNING

– 1990’S TO 2008

• Based on this

recommendation, MMM

Design completed a series of

tests and analysis evaluating

the existing utility tunnel

network.

• The conditions assessment

report was completed in 2000.

• The completion of this

assessment report launched

the tunnel rehabilitation work.



– 1990’S TO 2008

• In addition to

rehabilitation, the

University identified

tunnel replacements

and expansions to

better serve the

Grounds.

• These projects

included both state and

non-state funding.



– 1990’S TO 2008

• Once the 2000

assessment report was

complete, the University

proceeded with the

following projects: • “Big Bore” – replacement of

tunnel I and expansion of central

utilities to new facilities

• Tunnel G rehabilitation

• Tunnel Q rehabilitation

• Tunnel D rehabilitation

• Tunnel T rehabilitation



– 1990’S TO 2008

• Emergency situation in

2008 required the repair

of 90 linear feet of tunnel

under the busiest

intersection on Grounds.

• In addition to the repair

of this tunnel, the

University believed that

an update was needed

of the 2000 conditions

assessment report. 13 | Utility Tunnel Master Planning for the Future May 2013


– 1990’S TO 2008

• While completing routine

maintenance, University

personnel identified a

potential concern with the

structural integrity of the

existing tunnel.

• The University,

Contractor, and Engineer

worked on an expedited

schedule to make repairs.


UNIVERSITY AVENUE EMERGENCY TUNNEL

REPAIR/MASTER PLAN UPDATE

• Working together, the

design was completed in

2 weeks and approved by

review agencies.

• Contractor mobilized one

week after approval of

design.

• During initial excavation

issues were identified with

the original construction.




• It was determined that the

initial wall construction

utilized the rock removed

to create the trench as

large aggregate within the

cast-in-place wall.

• In addition, a closer

inspection of the MTHW

lines confirmed that their

useful life was rapidly

coming to an end.




• A redesign of the structural

repair and pipe replacement

was completed within one

week.

• Contractor utilized float in

other project schedules to

expedite delivery of

necessary materials.

• Project finished ahead of

schedule, and cost

approximately $390,000.




• Concurrent with the

design and construction

improvements to the

University Avenue project,

the engineer completed a

visual inspection of

approximately 1 mile of

tunnel that was

considered to have the

highest structural

concern.



REPAIR/MASTER PLAN UPDATE Tunnel Start Tunnel End Inspected in

2000 (MMM) Inspected in 2008 (Dewberry)

Repairs

A Point 16 Tunnel T (Near Bookstore)

Yes Yes Unknown

B Point 16 Clark Hall Yes Yes Full Concrete Encasement (Planned 2013)

C Tunnel B (Btwn Maury & Minor)

McCormick Bridge (East Side)

Yes - Full Concrete Encasement -(Estimated 2006)

D Point 16 Heat Plant Yes Yes Full Concrete Encasement Garrett to Rouss Hall (2012)

E Cobb Hall Tunnel D (11+75) Yes - Unknown

F Barringer Door Tunnel D (11+75) Yes - Unknown

G Tunnel D Multistory (14+15) Yes - Unknown

H Big Bore / Davis Vault Jordan Hall Yes - Partially Destroyed

I Heat Plant Medical School Bldg Yes - Unknown

J O’Hill Loading Dock Webb House Yes - Destroyed Capped at O’Hill

K O’Hill Loading Dock Maupin House (Now Serves Bldg 4)

Yes - Unknown

L O’Hill Loading Dock Thornton Hall Yes - Unknown

M Tunnel N &O (West End Thornton Hall)

Tunnel Q & Tunnel P (East End Thornton)

Yes - Unknown

N Ruffner Tunnel M & O (West End Thornton Hall)

Yes - Unknown

O Tunnel M & N (West End Thornton Hall)

Whitehead Road – Engineers Way

Yes - Unknown

P Tunnel M (East end Thornton Hall)

McCormick Bridge (West Side)

Yes Yes Full Concrete Encasement (2008)

Q Tunnel M & P (East End Thornton Hall)

Kerchof Hall Yes - Unknown

R Tunnel Q (East Side Thornton)

Thornton Mech Room (East Side Thornton)

Yes - Unknown

S Mem Gym Mary Munford Yes - Unknown

T Tunnel U (North of McCormick Bridge)

Memorial Gym Yes Yes Spot Repairs (2012)

U Tunnel T (North of McCormick Bridge)

Hancock House Yes Yes Full Strengthening top slab and encasement (2012)

V Tunnel A (Rodgers House) Newcomb Hall Yes - Unknown

W Tunnel T (S of Memorial Gym)

Central Grounds Parking Deck Yes - Unknown

X Campbell Hall Fayerweather Hall Yes - Unknown

AA* University Chapel (University Ave)

Bayly Museum - - Repairs in 2008 under University Avenue Only

• This update included a

thorough structural review

of all tunnels that had not

been strengthened

through projects over the

last 5 years.

• These included tunnels

labeled A, B, C, D

(partial), P, T, & U.




• The update included the

following:

• A detailed description of

issues observed tied to a

station.

• Recommendation of

improvements

• Professional opinion o

probable construction

cost

• Recommended

improvement period.




IMMEDIATE ACTION NECESSARY

Tunnel Station(s) Recommendation Magnitude of Cost

(Project Cost)

B General Keep all vehicles larger than a pick-up

truck away from this tunnel. Install/

maintain bollards.

$2,500

D

T

B 3+08 Replace steel roof beam $1,000

3+38 $1,000

D 4+00 to 4+20 Provide temporary horizontal bracing

of tunnel walls at 4’-0” o.c. until

permanent repair is constructed (See

Action Necessary Item)

$8,000

P 0+74 to 1+24 (End) Provide temporary vertical and

horizontal bracing of tunnel walls at

4’-0” o.c. until tunnel is replaced (See

Urgent Action Necessary Item)

$40,000

T 0+00 to 0+90 Provide temporary vertical and

horizontal bracing of tunnel walls at

4’-0” o.c. until tunnel portion is

replaced (See Urgent Action

Necessary Item)

$70,000

U 0+00 Provide temporary vertical shoring of

tunnel header beam until permanent

repair is performed (See Action

Necessary Item)

$2,000

U 5+85 to 6+00 Provide additional vertical and

horizontal shoring at 4’-0” o.c. until

permanent repair is performed (See


$12,000

U 8+84 (For 25 LF) Provide temporary horizontal shoring

of tunnel walls at 4’-0” o.c. until

permanent repair is performed (See


$10,000

• Based on the

recommendations of the

updated report, the

University has proceeded

with a dedicated funding

source and improvements.

• All projects are funded

through the capital budget,

and approximately $1

Million has been allocated

for the next two years.



– 2008 TO PRESENT

• Since 2008, the University has

used this update to completed

the following (Approximately

2,900 linear feet): • Tunnel Q Strengthening

• Tunnel P Repairs

• Tunnel A Repairs

• Central Anchors Re-anchoring/Realignment

• Tunnel D, T, & U Strengthening

• Tunnel B Strengthening & MTHW

improvements

• West Complex Tunnel Strengthening



– 2008 TO PRESENT

• The University’s previous, current, and

future commitment to their utility tunnel

system allows for:

• Safe work environment for employees.

• Reliable distribution of central utilities

throughout campus.

• Proactive approach and template for future

funding requests.

• Access to archived Information and ability to

respond to emergency situations in an

efficient and cost effective approach.

• Plan for future growth of the University.



– 2008 TO PRESENT

QUESTIONS????

24 Utility Tunnel Master Planning for the Future May 2013

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