Tamar Bridge Kerb Unit and Deck Waterproofing Remedial Work

Description

With the aim being to undertake work during the Spring of 2019, this preferred start date is intended to allow for all kerb fixings and corrosion remedial works to be completed, ahead of separate resurfacing work planned for 2020/21. Following close monitoring of the existing 7200 Kerb Units (4 studs per kerb unit) and the associated Deck Waterproofing System over recent years, since their initial installation, as part of the strengthening and widening scheme around the turn of the century, and following the identification of serious deterioration, a number of technical solutions were developed and tested and the preferred solution and range of activities required going forward is described as follows below in the Main Description. Preferred Methodology: — remove and retain existing kerb units for re-use; Remove existing mild steel holding down studs, clean and shot blast bridge deck to remove corrosion, — undertake plate testing (MPI) and, if necessary, undertake weld repairs, — weld new stainless steel holding down studs to the prepared bridge deck, — undertake weld test, — prime and waterproof bridge the deck with a high performance waterproofing system, — reinstate kerb units and fix down using new stainless steel fixings, — make good to all drainage connections, with all of these aforementioned activities requiring strict associated Traffic Management control. It is anticipated that the work may last for a duration of up to 12 months, from the proposed contract commencement date of 1.4.2019. Keywords: Kerbs, Waterproofing, Remedial Works