Case Study Tenax TT, HM3 & Rhyno®

Location: Pont Briwet Pont Briwet was built in 1860 and was a Grade II listed wooden structure. The structure carried a single track rail line and a single lane private toll road over the Near river Afon Dwyryd between and Penrhyndeudraeth railway station. With a 20mph speed for rail traffic and having a 2 for basal reinforcement of the working platform to Project Description: tonne weight limit for highway traffic combined with support the pressures applied by the cranes and piling Temporary Causeway which would narrow road and restricted levels of traffic made Pont rigs. To alleviate the effects of erosion and washout of Briwet the perfect candidate for replacement. In 2013 fines Rhyno® GW8129 was installed at the face of the withstand being submerged by work commenced on the bridge to construct a new slopes. tidal activity during construction. road and bridge. Geometry of causeway / working platform: In order to install the piled foundations for the new Max Height: 4.00m structure the designers, Hewson, determined that a Slope Angle: 26.50 / 450 causeway would be constructed from both sides of the Base Width: 20m shoreline into the estuary. The temporary causeway Total Length: 200m was constructed using locally sourced stone and Tenax Design standards: Eurocode 7 & BS8006-2010 geogrids for reinforcement allowing the operation of During the construction period the causeway was heavy plant. completely submerged by tidal activity on several Tenax TT Uniaxial geogrids were employed for slope occasions and being used for construction activity stability and Tenax LBO HM geogrids were employed within hours of the tidal event. Technical Requirements: • Maximum height 4m • Length 200m • Submerged by tidal activity • Withstanding operation of heavy plant

Client County Council Construction of the Causeway featuring original bridge Crane operating on the platform

Consultant: Hewson Consulting Engineers

Contractor: Hotchtief (UK) Construction Ltd

Piling Rig operating on the Causeway

“Thanks to Geosynthetics, we were able to construct a working platform

Fleming Road that allowed heavy civil activities to be undertaken within tidal conditions. Harrowbrook Industrial Estate One of the major benefits was even though the platforms where Hinckley submerged on a regular basis little to no work was required to platforms LE10 3DU Tel. 01455 617 139 after each tidal event. Without the working platform solution, the scheme [email protected] deliverables would have been very difficult to achieve”. www.geosyn.co.uk Matthew Mosley - Site Agent WWW.GEOSYN.CO.UK CALL: 01455 617139

Alert® Geoglas® Stratagrid Contamination Indicator Asphalt Reinforcement Soil Reinforcement Geogrid

Strataweb Slope Stabilisation

Bentotex® GCL Geosynthetic Clay Liner

Cellweb® TRP Tree Root Protection

Televev DuoDrain® High Strength Composite Drainage Product Woven Geotextile

Knotblock® Tenax Japanese Knotweed Barrier Soil Reinforcement Solutions

Ekotex® Total Tra c Exopave Non Woven Geotextile Heavy Duty Paver

Fiberforce® Equestrian Geotextile ®

Rhyno® Woven Geotextile

Geosynthetics Limited | Fleming Road | Harrowbrook Ind Est | Hinckley | Leicestershire |LE10 3DU