Early in 2006 Structural Renovations Ltd provided budgetary advice to John Foreman and Partners for the client, Capital and Counties, for repair and protection.

Subsequently a competitive tender was won by the company with work commencing in July 2006.

Restrictions imposed by the Port of London Authority, the Environment Agency and local residents were compounded by the range of tide levels and required detailed planning of all operations.

 

 

 

 

 

 

 

 

Metropolitan Wharf

Working within limited working hours and tides scaffolding was erected from the foreshore below.
Due to the level of high tide, the working level boards were tied down to prevent flotation and navigation lighting was installed.

Following a thorough clean on site investigation confirmed that the major problems related to the beams and columns within the tidal zones and the underside of the precast planks supporting the slab above.

The repair and protection specification was prepared by Fosroc Ltd and consisted of high build-hand placed polymer modified repair mortar and free flowing micro concrete.  This was followed by the application of 2 coats of a penetrating, hydrophobic silane-siloxane to protect the structure from attack by chloride ions and water intrusion.

To prevent the formation of new corrosion to the reinforcement in areas adjacent to the newly repaired concrete, Galvashield XP sacrificial anodes were installed and incorporated into the repairs. Once installed, the zinc core corrodes preferentially to the surrounding rebar providing ‘Cathodic Protection’ and therefore preventing incipient anode formation.

The contract was completed on time in an 18 week programme using over 11.5 tonnes of hand-applied mortar, 10 tonnes of flowable micro concrete and over 750 sacrificial anodes.

01753 825511                             www.structren.co.uk