ASL also undertook foundation and stability assessments at the locations of the foundation supports, which needed to be positioned on the existing cutting slopes due to the maximum span for the temporary bridge, to ensure that the temporary bridge was adequately supported whilst not adversely affecting the stability of the cutting.
A large crane was required to lift the temporary bridge into place and this need to be located on suitable ground due to the high outrigger loads associated with lifting the temporary bridge. . Due to the limited space available the outrigger were located adjacent to existing retaining walls and in gardens and therefore careful assessment was required to ensure that failure did not occur below outriggers that may have resulted in the crane toppling during lifting and prevent damage to existing walls and houses.
The geotechnical assessments enabled the project to be completed without any stability issues affecting the temporary works and with the minimal excavation and enabling works.