dam safety case history

Dam Safety Case HistoryDam Safety Case History

Columbia Lock and Dam

March 8, 1997

““A number of courageous people worked in sometimes A number of courageous people worked in sometimes dangerous circumstance to perform their missions. dangerous circumstance to perform their missions. We are grateful that throughout all of this no one was We are grateful that throughout all of this no one was injured and we were all successful in our efforts.”injured and we were all successful in our efforts.” CCHamby 97CCHamby 97

Location Location Map 2Map 2

• Columbia L&D

• Thatcher L&D

• Felsenthal L&D

• Jonesville L&D

• •

•

•

•

Columbia L & D DescriptColumbia L & D Descript

84’ x 600’ Lock

4@50’ Wide Tainter Gates

200’ Wide Navigation Pass

Guide Wall

FlowFlow

West Abutment

Miter Gate

The AccidentThe Accident

Columbia Lock and DamColumbia Lock and Dam8 March 978 March 978 March 978 March 97

9pm9pm9pm9pm

Columbia Lock and DamColumbia Lock and Dam

Columbia Lock and DamColumbia Lock and Dam

Columbia Lock and DamColumbia Lock and Dam

Columbia Lock and DamColumbia Lock and Dam

10pm10pm10pm10pm

Columbia Lock and DamColumbia Lock and Dam

1am1am1am1am

9 March 979 March 979 March 979 March 97

Columbia Lock and DamColumbia Lock and Dam

Columbia Lock and DamColumbia Lock and Dam

2:45am2:45am2:45am2:45am

Columbia Lock and DamColumbia Lock and Dam

6am6am6am6am

Photo Barge in Gate 1Photo Barge in Gate 1

• photo

10 Mar 97

Photo Barge in Photo Barge in Gate 1Gate 1

10 Mar 97

Photo Barge in Gate Photo Barge in Gate 11

Gate 1 Gate 1 DamageDamage

Barge Removed from Barge Removed from Gate 1Gate 1

• photo

11 Mar 97

Barge Removed

Identifying the Identifying the ProblemsProblems

• Remove Two Sunken Barges

• Damaged & Inoperable Tainter Gate

• Too Much Flow thru the Nav Pass

• The River Forecast is Bad News

• There is no heavy equipment upstream

Lock UnderwaterLock Underwater

• ___ photo fig II-1 (where is the lock?)

Lock UnderwaterLock Underwater

• ___ photo fig II-2

Highway Barriers

Lock ChamberLock Chamber

Miter Miter GateGate

Highway BarriersHighway Barriers

• Borrow from LADOTD

Highway BarriersHighway Barriers

• ___ photo fig II-3

Highway BarriersHighway Barriers

• ___ photo fig II-4

Miter Gate ExtensionMiter Gate Extension

• Designed and Built Wooden Extension

• __photo fig II-5

Miter Gate ExtensionMiter Gate Extension

Fig II-6 9 Apr

Timber over miter gate and barriers along the wall

Operating the LockOperating the Lock

• __photo fig II-7 opening the gate valves

Passing the Passing the Salvage Salvage Derrick Derrick BargeBarge

• __photo fig II-8 derrick barge goes through the lock

Salvage OpsSalvage Ops

• Orientation of barges fig IV-2

Salvage OpsSalvage Ops

• ___ fig IV-1

Salvage Ops – Ent Pipe Salvage Ops – Ent Pipe SktchSktch• Sketch diver going through the

pipe to cut holes

Salvage Ops – Ent Pipe Salvage Ops – Ent Pipe Phot0Phot0

• ___ figs IV-3 pipe in water

Salvage Ops - DiverSalvage Ops - Diver

• Photo diver going through Photo diver going through the pipe to cut holesthe pipe to cut holes

Salvage Ops - TenderSalvage Ops - Tender

• Photo diver going through Photo diver going through the pipe to cut holesthe pipe to cut holes

Salvage Ops - Salvage Ops - SpectatorsSpectators

• TV Media

• Spectators photo

Salvage Ops – Barge Salvage Ops – Barge ExposedExposed

• ___ figs IV-4

Salvage Ops – Barge Salvage Ops – Barge RisingRising

• ___ figs IV-4

Salvage Ops – Barge Salvage Ops – Barge RaisedRaised

• ___ figs IV-4

Salvage Ops- Chain Salvage Ops- Chain ConnectionConnection

• ___ figs IV-x

Stone Repairs Sketch 1Stone Repairs Sketch 1

• Show plan view sketch of all holes

Stone Repairs Sketch Stone Repairs Sketch guideWxguideWx

Stone Repairs Sketch Stone Repairs Sketch tainterxtainterx

Stone Repair Photo new Stone Repair Photo new stonestone

Stone Repair Photo drop Stone Repair Photo drop stonestone

Stone Repairs Sketch US Stone Repairs Sketch US fix xfix x

Stone Repairs Sketch nav Stone Repairs Sketch nav xx

Navigation Pass FlowNavigation Pass Flow

• __photo fig II-10 water thru nav pass 9Apr

• add sound from VHF tape

Navigation Pass Navigation Pass DamageDamage

• __photo fig II-10 9 Apr

• Additional Surveys made after river slowed down

• Slab fell into the hole (show 3D survey or fig III-10)

• Show cross section with hole and stability prob

Stone Repairs Sketch nav Stone Repairs Sketch nav origorig

Stone Repairs Sketch nav Stone Repairs Sketch nav holehole

Navigation Pass Repair Navigation Pass Repair PhotoPhoto

• __photo 30 May

Bent strut Bent strut frameframe

Bent strut Bent strut frame frame

measurementmeasurementss

Gate DamageGate Damage• Trunion bolts

• Center hole jack

Installed Stop logs Installed Stop logs

• Fig IV-14

• ___

WorkBargeWorkBarge

• Bullet

• ___

Second Second Barge Barge

Flips on Flips on to it’s to it’s SideSide

8 June 97

Secure the TrunionSecure the Trunion

• Bullet

• ___

Marking Marking the VEEthe VEE

RestraintRestraintss

Restraint Applied

Gentle Gentle ForceForce

Tightening Up the Restraint

Heat the Heat the VEE’sVEE’s

• photo

Shrinking the Vee’sShrinking the Vee’sShrinking the Vee’s – Cooled by Pressurized H2O

Job DoneJob Done

• photo

Gate 1 BeforeGate 1 BeforeBefore

• after Gate 1 Gate 1 AfterAfter

Brace

Cover Plate

After

Summing it upSumming it up

$1.25m

Overall Repair Overall Repair ExpenseExpense