Construction Sequence

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Construction Sequence

• Michele McMurtry

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C-470 overpass
Source Jefferson County Sheriffs Office
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Construction Sequence

• 900 p.m. on May 11 until 500 a.m. on May 12
• I-70 to be closed for 8 hours
• 1100 p.m. until 1230 a.m.
• Hoisting girder sections

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Construction Sequence (Contd.)
The bolts in the photograph are the actual
splicing bolts
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Girder identification mark painted by shipping
crew
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Fabricators piece mark stamped into the girder
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Construction Sequence (Contd.)

• 400 a.m. 1st girder in place
• No time to install 2nd girder
• Installation of temporary bracing
• Bolting problems
• Bolts too long
• Employee sent for different bolts
• I-70 reopened at 530 a.m.

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Construction Sequence (Contd.)
11th
15th
12th
13th
14th
70
60
50
Temperature F degrees
40
30
Accident
Girder Erection
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