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Porth Relief Road, Pontygwaith - South Wales

Project Specification

As part of the relief road construction, two pre-cast culverts were installed below a new intersection to allow uninterrupted flow of the river Rhondda Fach. To facilitate construction excavation of the existing embankment was necessary. This required additional temporary support to the slope, retaining wall and the road above.

Solution

The slope was cut back to 60° and a geotextile membrane and wire mesh were laid on top to strengthen the embankment and prevent washout. A total of 5 rows of anchors were driven perpendicular into the slope to a depth of 6m at equal spacings. Due to the close proximity of the river hand held installation equipment was utilised. The anchors were then loadlocked and timber soldiers were used to spread the load evenly across the slope. The client was so impressed with the system that it was specified on four additional phases.

Anchor System: S08EC spheroidal graphite cast iron anchor c/w 6m of 12mm Ø galvanised steel wire tendon, 150mm x 150mm galvanised steel load plate and 12mm galvanised steel wedge grip

Quantity: 45      Design Life: 5 yrs      Soil Type: Silty/Cobbles