World Bank SBD for Small Works. Labour Based (LBES) Contracts FIDIC short form In country Contracts (eg, Philippines) – can lead to problems. * FIDIC Design Build or MDB Construction,Design by Employer with Design Build Inclusion. FIDIC MDB Harmonised Construction Contract Conference
MAKIRA RIVER CROSSINGS SOLOMON ISLANDS FIDIC MDB Construction Contract with Design, Build Inclusions Case Study : Makira River Crossings, Solomon Islands
MAKIRA CROSSINGS PROJECT: DETAILS 26 River Crossings in Coastal Highway on Makira Island, Solomon Islands High level and low level bridges, causeways and fords 2010 – 2012 Contract Value $17 million
MAKIRA BRIDGES – MANAGEMENT AND FINANCING Finance: AusAID, NZAID, ADB (grant funds) Management by ADB EA: SI Ministry of Infrastructure Project Management: Cardno Australia Contractor: McConnell Dowell NZ. Crossings create connectivity, alleviate poverty and improve way of life for locals.
Makira Bridges Challenges: – Rivers are braided, some carry large debris loads; – High peak rainfall; – Seismic effects; – Remote sites. – Limited budget. Low traffic volumes favour low level, submergible structures, and do not justify high level bridges throughout.
MAKIRA BRIDGES: CONTRACT FIDIC 2006 MDB Harmonised Version of Construction Contract. *Design by Employer, BUT High level Bridges: Design by Contractor, FIDIC MDB provisions for design by contractor not sufficient.
MAKIRA HIGH LEVEL BRIDGES: DESIGN BUILD PROVISIONS * Separate SECTION of Specification dedicated to Design and Construction of High Level Bridges. Design criteria in Bid Documents: Bidder submits Concept Bridge Proposal in reasonable detail; Design Engineer, Geotechnical Engineer, Independent Design Reviewer: To be nominated with Bid, and on completion of tasks, to issue certificates; Contractor to submit full details, but Engineer does not approve Contractor’s Design Engineer to make inspections.
MAKIRA CROSSINGS Advantages of Design Build – Contractor can provide a standard or existing design to his and Employer’s cost and time advantage; – Design and geotechnical risks transferred to contractor. Design Form Proposed: Tied Steel Arch, 75m span. As specified : above 100 year flood, T44 loading, single lane with concrete deck. Outcome: Very successful.