Bridge installation techniques

Bridge installation techniques range from straightforward construction methods to highly complex and unusual methods developed for a specific project. Construction techniques covered in earlier chapters are adequate to describe normal bridge construction. In this chapter, more unusual and complex techniques are described which use the bridge structure as part of the temporary works, depending on the bridge design concept and the specific project constraints. With more unusual techniques, the installation technique will often drive the final bridge design, and certainly the detailing. Techniques considered here include partial deck erection schemes, deck erection as a single unit, erection by tunnelling and mining, and segmental deck erection. Factors to consider in the design of the temporary works for these bridge installation techniques include significant stability issues (global and local), robustness, foundations and supports, plant and equipment (mechanical and motive systems design), contingency planning, control and monitoring systems, and independent review and validation.