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Architectural, construction, engineering and inspection services

Cornwall Council | Published January 17, 2017  -  Deadline February 13, 2017

Inspection of hidden critical elements (hanger and cable band bolts) in 2014 and associated laboratory testing in 2015 revealed some anomalies in bolt hardness values.

Some additional sample hardness testing was instructed and undertaken in Summer 2016. This was further extended to full coverage hardness testing in Autumn 2016.

Preliminary results of the full testing exercise have indicated that provision for a programme of bolt replacement is now required. The nature of the proposed replacement works is of a relatively specialist nature and will involve works at height adjacent to live traffic and a waterway. The works are likely to be instructed for priority completion.

In view of the likely mobilisation period and winter working restrictions this is expected to mean a start on site in Spring 2017.

It should be noted that testing works and interpretation are still ongoing at the date of publication of this document and therefore the final scope of the works cannot yet be defined. As such, it is envisaged that the client will develop and enhance the agreed specification and scope of works in collaboration with a likely maximum of 3 Contractors to be selected to discuss possibilities and options through a formal Competitive Dialogue Procurement Process, to arrive at an optimum working solution of planned replacement for these key components of the Bridge structure over an agreed period of time. Currently, the range of work may vary from the minimal replacements of bolts, i.e. approximately 20 % out of a total of 1 374 bolts, up to full replacement and this is reflected in the estimated value of work, envisaged to be between 2 825 000 and 4 788 000 GBP.

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