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Construction Sequence

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Construction Sequence

Michele McMurtry

C-470 overpass

Source: Jefferson County Sheriff’s Office

- 9:00 p.m. on May 11 until 5:00 a.m. on May 12
- I-70 to be closed for 8 hours
- 11:00 p.m. until 12:30 a.m.
- Hoisting girder sections

Splice plates

The bolts in the photograph are the actual splicing bolts

Girder identification mark painted by shipping crew

Fabricator’s piece mark stamped into the girder

- 4:00 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 5:30 a.m.

Construction Sequence (Cont’d.)

11th

15th

12th

13th

14th

70

60

50

Temperature F degrees

40

30

Accident

Girder Erection