A landslide occurred during January 2015 blocking vehicular access to Great Western Beach from Cliff Road, Newquay. The landslide also caused damage to a cliff-top public seating area, rendering it unsafe.
Quantum were appointed on a design and build basis to stabilise the slope, reopen the highway and reinstate the public seating area. The works involved stabilisation by re-profiling and anchoring, clearing slipped material and replacing fencing so beach access could be reopened.
The uppermost anchorages were installed first to make the slope safe before works could commence at the base. These anchorages were installed from above using a 22 tonne excavator to reach over the crest. Slipped debris was then cleared from the base of the slope to allow the installation of the remaining soil nails/anchorages by self-drilling.
Once all the anchorages were installed, a layer of Encamat erosion protection matting was placed over exposed soils and overlain with stainless steel Geobrugg Tecco mesh.
Once the slope stabilisation works were complete, the slipped/landslide material was removed from site, and fencing and street furniture re-installed to the public area.
Quantum were subsequently awarded a contract for design and build piling and minor civils at the Western Beach site. Engineers identified a need for piled foundations to strengthen an elevated section of the access road. The piles were positioned very closely to an existing parapet wall and to the Great Western Hotel which remained open during the works. The section requiring strengthening was deemed unsafe for loading so conventional piling plant could not be used.
Using one of our TEI Hem560 drilling masts mounted on a 20 tonne excavator we were able to install Ischebeck TITAN 52/26 self drilling anchor piles both vertically and raked with the carrier excavator sited outside the unsafe areas. Anchors could also be installed very close to the existing structures with minimal vibration, dust and noise. The overall piling period was much reduced by using this method reducing the impact on local hotels.
On completion of the piling Quantum constructed a reinforced concrete capping beam tied into the piles as well as ancillary drainage works.
Once the capping beams were completed and the road could be loaded Quantum used the same excavator mounted TEI Hem560 drill mast in conjunction with roped access technicians to install Ischebeck TITAN 40/16 self drilling soil nails beneath the road and between the anchor piles to provide lateral support.