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Construction Sequence

Construction Sequence. Michele McMurtry. C-470 overpass. Source: Jefferson County Sheriff’s Office. Construction Sequence. 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.

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Construction Sequence

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  1. Construction Sequence Michele McMurtry

  2. C-470 overpass Source: Jefferson County Sheriff’s Office

  3. Construction Sequence • 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

  4. Splice plates Construction Sequence (Cont’d.) The bolts in the photograph are the actual splicing bolts

  5. Girder identification mark painted by shipping crew

  6. Fabricator’s piece mark stamped into the girder

  7. Construction Sequence (Cont’d.) • 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.

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

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