Harrison Street Viaduct West of the Chicago River — Demolition Procedure

Project Overview

Description

Demolition procedure for the Harrison Street Viaduct on the west side of the Chicago River — coordinating with CTA, utility, and roadway operations.

HBM's Scope

Scope of Work

• ›Demolition sequencing
• ›Utility protection
• ›CTA and rail coordination
• ›Demolition of the Harrison Street Viaduct west of the Chicago River, Chicago, Illinois; part of CDOT Project No. E-1-519; phased removal performed by Milburn Demolition in collaboration with HBM
• ›Structure: 22 spans, overall length approximately 780'-6", out-to-out deck width 66'-0"; superstructure of reinforced concrete deck (8" plus 2" asphalt overlay) on rolled and built-up steel girders; substructure of a reinforced concrete west abutment and built-up steel bent caps and columns; concrete encasement at portions of girders, bent caps, and columns
• ›Three removal phases: Phase 1 (Stages I, II, partial III) Spans 1–5, portion of the west abutment, portions of Bents 1–4; Phase 2 (Stages III–VI) Spans 6–12, portions of Bents 5–11; Phase 3 (Stages VII–XI) Spans 13–22, portions of Bents 12–22
• ›Structural Analysis: non-linear finite element analysis (FEA) using CSI Bridge software (frame elements for steel columns/girders/stringers, shell elements for the concrete deck, 2-Joint Links for stringer connections); hand calculations using Mathcad
• ›Façade protection for the north building, including marble base preservation