MHB Consultants Ltd recently carried out the design of Rock Catch Fences for various sites along the A83 on behalf of Geo-Rope.
Work to provide protection to the A83 north of Arrochar at the Rest and Be Thankful was extensive and involved mainly catch fences. The client wanted to develop a new type of protection which would be innovative for the A83.
MHB Consultants designed an excavation adjacent to the road to catch debris falling from the slope above via a large concrete baffle wall in the gully. The baffle wall was piled into the rock and cast in situ. The excavation for the debris basin took advantage of a discontinuity in the rock mass. This allowed 50% of the material to be mechanically excavated, while the rest was drill stitched and then removed.
The basin was lined in anchors and sprayed concrete to protect the road.