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Ripon City

When Aggregate Industries’ Ripon City Quarry facility needed to access the South Side of the River Ure from its Boroughbridge Road site in East Yorkshire, the decision was made to install a 64-m span panel ‘Bailey Bridge’ for access.

Aarsleff was appointed to undertake the foundation work, which was estimated to require the installation of 12 precast reinforced concrete piles per abutment. However with the project requiring sheet piling for abutments, Aarsleff worked closely with sheet piling company Ivor King on their design and installation before arriving on site to commence driving the precast concrete piles.

Ground conditions varied considerably for each abutment, which had to be taken into account for the piling requirements and it was anticipated that piles of 13m would be required for the South abutment and a minimum of 19m on the North abutment, although there was the potential for these to be between 24m and 26m in length.

The work was due to take place in 2012 but, persistent flooding around the quarry meant that delays were unavoidable. Dry weather in 2013 allowed access roads, over-head cable diversions, piling works and launch platforms to be completed. Aarsleff designed and installed the required 24 No. 300mm precast reinforced concrete piles, which were supplied and manufactured by Centrum, Aarsleff’s wholly owned subsidiary based in Newark Nottinghamshire.

12 piles of 13m length were installed on the South abutment and 12 piles of 25m length on the North abutment, using the company’s own Banut 700, 5 tonne hydraulically active drop hammer rig.

Commenting on the installation Project Manager Nathan Sale said: “Although a relatively small project, it was particularly complex as a result of the variable ground conditions. However, working closely with the Consulting Engineers Peters Associates and sheet piling company Ivor King, the project was completed successfully and in just three days.”

Martin Owen, Group Engineer for Aggregate Industries Ltd., said “‘The two abutments of the 64 metre span temporary bridge over the River Ure at Ripon City Quarry are each founded on 300mm square precast concrete driven piles, supplied and driven by Aarsleff. Ground conditions and persistent flood risk presented significant challenges. Piles were generally 12m long on the South side and 25m long on the North side.

Aarsleff proved flexible in their approach and were able to install the piles when river levels were low but continually changing. The last launch of the bridge was successfully completed on 20 January 2014, in readiness for the 50 Tonne Dump trucks it will carry’”

Client: Aggregate Industries Ltd

Piling Contractor: Aarsleff Ground Engineering Ltd

Construction Date: October 2013

Scope of Works: 24, 300mm precast reinforced concrete piles

Equipment: Banut 700, 5 tonne hydraulically active drop hammer

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