Selective Structural Demolition for Bridge #09, Gardez to Khost Road, Afghanistan

The project is part of the Afghanistan Engineering Support Program, which aims to improve the country's infrastructure. The construction of Bridge #09 is a critical component of this program, as it will provide a vital transportation link between the cities of Gardez and Khost. The project involves the selective structural demolition of the existing bridge superstructure, partial demolition of the existing bridge substructure, and removal of existing asphaltic pavement within the project limits. The demolition process will be carried out in a systematic manner, from higher to lower level, to minimize disruption to existing traffic and utility infrastructure. The contractor is required to verify that utilities have been disconnected and capped before starting selective demolition operations. The selective demolition process will involve the removal of existing construction only to the extent required by new construction and as indicated. The contractor will use methods required to complete the work within the limitations of governing regulations, using good demolition procedures and practices. The existing substructures will be demolished to a limit of 600mm below proposed grade, unless it interferes with the proposed foundations in which case existing foundations will be removed in their entirety. The project requires the contractor to maintain existing utilities indicated to remain in service and protect them against damage during selective demolition operations. The contractor will also be responsible for providing temporary facilities, such as barricades and other protection required to prevent injury to people. Temporary shoring will be provided and maintained to preserve stability and prevent movement, settlement, or collapse of construction. The selective demolition procedures for specific materials, such as concrete and masonry, will involve cutting concrete full depth at junctures with construction to remain and at regular intervals using power-driven saws, then removing concrete between saw cuts. For masonry, the contractor will demolish in sections, using hand tools or mechanical equipment as necessary. The project will be carried out in accordance with governing local regulations, including ANSI/ASSE A10.6, "Safety and Health Program Requirements for Demolition Operations" and NFPA 241, "Standard for Safeguarding Construction, Alteration, and Demolition Operations" or equivalent industry standards. The contractor will also be required to comply with hauling and disposal regulations of authorities having jurisdiction. The project timeline and budget information are not provided in the document. However, the project is expected to be completed in accordance with the requirements outlined in the specification sections. The contractor will be responsible for providing the necessary submittals, including a schedule of selective demolition activities, and for complying with the quality assurance requirements outlined in the specification sections.