Client Request - Builder - general in BH12

I need an urgent estimate to make repairs to a retaining wall. Depending on the estimates a decision will be made on whether and which way to proceed with the necessary repairs.

The retaining wall is approximately 2m high and retains a concrete driveway.

I have had a structural engineer view the wall, he has proposed two solutions:

OPTION 1: Full replacement of the 10m northeast wall and the first 2m of the joining northwest wall.

• Wall to be built from a sandwich of 100mm 7 N/sq mm concrete blocks with a 100mm A393 steel mesh reinforced concrete core.
• Base to be 1600mm wide, 250mm deep, reinforced with A393 mesh top and bottom.
• 1200mm H10 starter bars at 100mm centres projecting 500mm.
• Concrete slab to be relaid where excavated to rebuild wall, 150mm deep A393 mesh top over a slip membrane and blinding.

OPTION 2: Stengething of the 10m northeast wall by refacing with a new wall:

• 1200mm by 300mm reinforced concrete base
• 215mm concrete hollow block wall with stainless steel bed joint reinforcement and helifix bars at 450mm centres each way.

Rapid rough estimates very much appreciated!

Please see attached for photo of the wall and engineers sketch plan. Please use the discussion area on this page to request any further details.

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