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Bridge Demolition Practices (2019) / Chapter Skim
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Pages 17-27

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From page 17...
... 17 Overview To understand better the current bridge demolition practices used by state transportation agencies, a survey of practice was conducted through NCHRP in cooperation with AASHTO. Each of the voting members of the AASHTO Subcommittee on Bridges and Structures was contacted by e-mail for the survey.
From page 18...
... 18 Bridge Demolition Practices The following owner review practices were investigated: • Who prepares the demolition plan submittal? • Whether a licensed design professional is required to sign and seal the demolition plan.
From page 19...
... State of the Practice 19 common examples are "design–bid–build," "design–build," and "public–private partnership." Part of the purpose of this section of the survey was to gauge whether, of the 35 state DOTs that require a submittal of a bridge demolition plan, it is common practice to vary demolition submittal requirements with project delivery methods. Eight (23%)
From page 20...
... 20 Bridge Demolition Practices 86% 83% 83% 17% 0 5 10 15 20 25 30 35 Agencies (35 Respondents) Other Phased demolition Partial demolition Total bridge demolition Figure 5.
From page 21...
... State of the Practice 21 calculations, equipment date and lifting capacity, and traffic control. Some agencies selected "other" with the following explanations: • A demolition plan is required for the selected method of removal; for hydroblasting, the method of control of water or slurry runoff and measures for safe containment of concrete fragments must be shown.
From page 22...
... 22 Bridge Demolition Practices • Guide Spec (not defined)
From page 23...
... State of the Practice 23 are resolved with concurrence by the contractor prior to the start of demolition. As displayed in Figure 10, 91% or 32 of the respondents said written reviews are provided to the demolition contractor.
From page 24...
... 24 Bridge Demolition Practices field oversight of demolition activities. Of those 42 agencies, all but one agency responded that they do.
From page 25...
... State of the Practice 25 the agencies that commented also limit the type, size, and locations of equipment like concrete impact breakers. The common reason for the limitations is to protect bridge members that will remain from damage.
From page 26...
... 26 Bridge Demolition Practices responses. The common method is the inspector daily report or diary, with 93% or 39 of the agencies using this method.
From page 27...
... State of the Practice 27 • On-site predemolition meetings are required prior to the start of demolition by approximately one-half of the agencies, but only two agencies have a standard agenda. • Only 10 agencies require a contingency plan identifying specific responses to unanticipated occurrences.

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