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Life-Cycle Engineering Services | EXPANDED

Modjeski and Masters is pleased to announce the acquisition of structural engineering firm Summit Engineering Group, Inc. Our combined engineering prowess and respective technical skillsets will enable us to provide streamlined design and construction solutions to best meet client needs.

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Niles Truss Bridge Inspection, Instrumentation & Testing

| View Projects:USA Niles, MI

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  • Service:

    Field Services
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  • Overview

    When it was constructed in 1899, the pin-connected truss spans of the Niles Railroad Bridge over the St. Joseph River carried two tracks. Today, the bridge has only one active track. Traditional methods of inspection call for rail-mounted equipment. But Amtrak could ill afford to tie up the only remaining track on the bridge for the procedure. The solution to their dilemma seemed obvious: Amtrak needed a firm capable of inspecting all 112 bridge pins while minimizing rail service disruptions. But who was capable of performing such a complicated procedure? They found the answer in Modjeski and Masters.
    Mindful of Amtrak’s service disruption concerns, we quickly ruled out the use of rail-mounted inspection equipment. Instead, our innovative inspectors implemented technical and rope access methods to aid in the instrumentation and testing of all bridge pins. Working in teams of two, Modjeski and Masters’ experienced inspection crew climbed to each truss joint and utilized ultrasonic testing (UT) to find defects in the pins. Characteristic of many of our projects, we exceeded our client’s expectations. We tested all 112 bridge pins with zero service disruption to the active track. Additionally, we provided illustrated findings and an ultrasonic pin testing report that laid the groundwork to develop necessary connection retrofit designs.
    A creative approach plus an innovative solution. It’s a successful formula that’s a trademark of every Modjeski and Masters project. With the Niles Railroad Bridge, we brought added value to the inspection, testing and rehabilitation services for this historic 633-ft long deck truss. Our expertise in a full range of bridge engineering services helped Amtrak extend the life of this century-old bridge without interrupting service on the line.
  • Description

    Tasks Performed
    • Ultrasonic Testing of Bridge Pins
    • Rehabilitation – Design (Preliminary and Final)
    • In-Depth Inspection
    • Technical Access
    • Fatigue Rating
    • Load Capacity Rating

    Bridge Geometry
    • Length of Main Span – 120 feet
    • Total Project Length – 633 feet
    • Tracks on Structure – Two tracks
  • Testimonial

    We tested all 112 bridge pins with zero service disruption to the active track.
  • Credits

    Leon K. Huang, PE (Principal In Charge)
    Kevin W. Johns, PE (Project Manager)
    Richard A. Little, PE (Field Services Manager)
    Michael S. Januszkiewicz, PE (Inspection Team Leader)
    Bradley C. Croop, PE (Bridge Inspector)
    Daniel B. Irwin, PE (Project Engineer)