Dam Safety Case History by aci86998

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									Dam Safety Case History

Columbia Lock and Dam
March 8, 1997


   “A number of courageous people worked in sometimes
   dangerous circumstance to perform their missions. We
   are grateful that throughout all of this no one was
   injured and we were all successful in our efforts.”
                                              CCHamby 97
Location         •       Felsenthal L&D
  Map 2          •       Thatcher L&D


     •
                     • Columbia L&D
         •
                         •    Jonesville L&D
             •       •

                          •
Columbia L & D Descript


             84’ x 600’ Lock

                                200’ Wide Navigation
                Miter Gate
                                Pass




                4@50’ Wide
                Tainter Gates         West Abutment

Guide Wall
The Accident
             Columbia Lock and Dam
8 March 97




   9pm
Columbia Lock and Dam
Columbia Lock and Dam
Columbia Lock and Dam
   Columbia Lock and Dam




10pm
9 March 97   Columbia Lock and Dam




              1am
Columbia Lock and Dam
Columbia Lock and Dam




    2:45am
Columbia Lock and Dam




         6am
10 Mar 97


            Photo Barge in Gate 1


            • photo
10 Mar 97
            Photo Barge in Gate
                     1
Photo Barge in Gate 1
Gate 1 Damage
            Barge Removed from Gate
11 Mar 97




                       1

              • photo
Barge Removed
          Identifying the
             Problems
•   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 Underwater

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

        Lock Underwater

• ___ photo fig II-2
                        Lock Chamber




                Miter
                Gate
     Highway Barriers

• Borrow from LADOTD
       Highway Barriers

• ___ photo fig II-3
       Highway Barriers

• ___ photo fig II-4
   Miter Gate Extension

• Designed and Built Wooden Extension
• __photo fig II-5
   Miter Gate Extension

Fig II-6 9 Apr
Timber over miter gate and barriers along
  the wall
     Operating the Lock

• __photo fig II-7 opening the gate valves
Passing the
  Salvage
  Derrick
   Barge

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

• Orientation of barges fig IV-2
           Salvage Ops

• ___ fig IV-1
 Salvage Ops – Ent Pipe
• Sketch diver going through the
              Sktch
  pipe to cut holes
Salvage Ops – Ent Pipe
         Phot0
• ___ figs IV-3 pipe in water
  Salvage Ops - Diver

• Photo diver going through the
  pipe to cut holes
 Salvage Ops - Tender

• Photo diver going through the
  pipe to cut holes
        Salvage Ops -
         Spectators
• TV Media
• Spectators photo
   Salvage Ops – Barge
         Exposed
• ___ figs IV-4
   Salvage Ops – Barge
          Rising
• ___ figs IV-4
   Salvage Ops – Barge
          Raised
• ___ figs IV-4
     Salvage Ops- Chain
         Connection
• ___ figs IV-x
 Stone Repairs Sketch 1

• Show plan view sketch of all holes
Stone Repairs Sketch
       guideWx
Stone Repairs Sketch
      tainterx
Stone Repair Photo new
        stone
Stone Repair Photo drop
         stone
Stone Repairs Sketch US
         fix x
Stone Repairs Sketch nav x
    Navigation Pass Flow

• __photo fig II-10 water thru nav pass 9Apr
•   add sound from VHF tape
  Navigation Pass Damage

• __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
          orig
Stone Repairs Sketch nav
          hole
 Navigation Pass Repair
         Photo
• __photo 30 May
Bent strut
  frame
 Bent strut
   frame
measurements
Gate Damage
       • Trunion bolts
       • Center hole jack
Installed Stop logs

• Fig IV-14
• ___
           WorkBarge

• Bullet
• ___
 Second
 Barge
Flips on
to it’s
  Side
8 June 97
     Secure the Trunion

• Bullet
• ___
Marking
the VEE
        Restraint Applied
Restraint
    s
   Gentle
Tightening Up the Restraint

   Force
Heat the
 VEE’s

• photo
           the
ShrinkingShrinking the Vee’s –
   Vee’s Cooled by Pressurized
           H2O
    Job Done


• photo
Gate 1 Before
        Before
• after           Gate 1 After
                  After



          Brace
Summing it up
Overall Repair
   Expense
    $1.25m

								
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