The site team has undergone underwater excavation in rock using rockwheel aka cold milling. The main scope for the project comprises of repairs to the existing masonry walls, using a combination of concrete, structural grouts and mortars, and replacement stone blocks from a local quarry.
Scour and erosion to the toe wall was recognised as a potential source of weakness in the future, so concrete protection was proposed as a “toe beam”, along the main pier walls. The method proposed by the client/designers for excavation from the toe into the sea bed (the bed material is mudstone, similar to slate) was Hydro-demolition.
Excavator mounted rockwheel or “cold mill”
Elimination of a high-risk operation, improvements to the marine environment, reduced noise, reduced usage of fresh water, reduced vehicle movements, improved programme and reduced cost. No visible silt during excavation.
For more information regarding this innovation, please see the attachment below.
Monitor Report. Balfour Beatty. North Yorkshire. August 2019.
The Scheme does not promote or endorse any products, goods or services. For more information, click here.