Demolition Procedure: IL 89 Bridge over Illinois River

Project Overview

Description

Demolition procedure development and engineering analysis for the IL 89 bridge over the Illinois River — accounting for waterway, environmental, and traffic constraints.

HBM's Scope

Scope of Work

• ›Demolition sequencing analysis
• ›Waterway protection planning
• ›Procedure documentation
• ›Bridge at Spring Valley in Bureau County, Illinois; Omega III, LLC was a subcontractor for ICC
• ›Bridge constructed 1934; 19 spans (mix of concrete slabs and steel trusses). First six and last eight approach spans: 7 1/2" cast-in-place concrete slab on four W24x62 steel beams on multi-column bents on concrete piles. Middle five spans: Pennsylvania steel trusses with 7 1/2" CIP slab on four W18x60 stringers on W30x116 floor beams supported by six two-column piers
• ›Truss-span Piers 1, 2, 3 & 6 on timber piles; Piers 4 & 5 on spread footings on rock; Type T-1 (modified) railing; 1775'-7 3/8" back-to-back abutments; 23'-4" out-to-out deck; no skew
• ›Structural Analysis stages: Longitudinal (Deck & Beams Demolition Stage with excavator/loader loads; Truss Span Blasting Stage with controlled blast charges) and Transverse (top slab for a 56-kip excavator wheel load)