Page 68 - Bridge and Highway Structure Rehabilitation and Repair
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CHAPTER 2 DIAGNOSTIC DESIGN AND SELECTIVE RECONSTRUCTION 43
4. It may require reconstruction of part of the bridge other than the deck or even replacing the
entire bridge. Initially, theoretical analysis, application of design codes, and preparation of
construction drawings in the design office are required, followed by field work based on
technical specifications and special provisions.
5. As discussed in Chapter 1, major rehabilitations involve major structural repairs or the
replacement of primary bridge elements. Examples include:
• Pier and pier cap replacement
• Deck replacement
• Superstructure replacement
• Bridge widening
• Strengthening and retrofi t.
2.1.5 Mitigation Solutions
1. Another way of looking at maintenance is defining it as “mitigation.”
Mitigation technology is an alternate to rehabilitation, providing alternate solutions through
one or more of the following approaches (Figure 2.4):
• Minimizing the impact by limiting the degree or magnitude of the action and its imple-
mentation
• Rectifying the impact/deterioration by restoring the impacted environment
• Eliminating the impact/deterioration over time by preservation and maintenance operations
during the life of the action
• Compensating for the impact/deterioration by replacing or providing substitute resources,
alternate solutions, and environmental controls.
2. The following items need to be considered:
• Improve traffi c conditions
• Improve safety
Figure 2.4 Pillars of engineering maintenance.
