Gallery - ground engineering

Anchoring

Loch Arklet

Loch Arklet dam was built in June 1914 commissioned for the Corporation of Glasgow, the dam provides water to the City of Glasgow.

After 100 years of service, Scottish Water has strengthened the dam by installing high capacity ground anchors to post-tension the structure. 

64 number strand anchors were instaled with capacities between 3000kN and 4000kN some of the highest capacity anchors installed in the UK.

Spey Dam

As a result of revised flood estimates and dam stability analyses, Installation of vertical post tensioned rock anchors into the dam foundation throughout the length of the spillway section of the dam was carried out..

 

Grouting

Dounreay 

Works required to hydraulically isolate the Dounreay shaft to reduce potential water ingress during future radioactive waste removal operations.

The works commenced with site characterisation & baseline hydrological testing followed by bulk infilling of the Liquid Effluent Discharge Tunnel (LEDT) and then high pressure rock fissure injection grouting. All drilling and grouting equipment operated with datalogged sensors and grouting control included realtime ground movement monitoring at depths of up to 100m with a resolution of 0.03mm. 

Falkirk

Falkirk High Station is being extended as part of the Edinburgh to Glasgow Improvement Programme (EGIP).

Due to the presence of mine workings it was concluded that there was a high risk of surface subsidence. Stabilise the shallow coal seams under the planned platform extension was carried out by drilling and grouting. 

Piling

Waverley Steps, Edinburgh

As part of the redevelopment of Waverley Steps in Edinburgh, specialist piling works were required for foundations which support new escalators and lifts leading into the station.  The piles will also support a new canopy which will arch over the steps to provide weather protection.

The works comprised the installation and grouting of 62 no. piles in 220mm diameter holes with drill depths varying from 12m to 21m.  The drilling works were undertaken using the existing concrete steps as a piling platform.  This allowed all the piling works to be completed prior to demolition of the steps which led to a programme advantage for the Principal Contractor.

A steep slope rotary rig was developed for the works which allowed the piles to be drilled on the steps which had a slope of 28 degrees.  

St Davids 2016

Works were required for the replacement of the existing RLNI Lifeboat station seen on the left with the new structure on the right to accomodate the new £2.7m Tamar class lifeboat.

Installation of 48 No. 322.9mm diameter 6.5m deep boathouse support column piles and six 322.9mm diameter 11.0m deep cliff top access bridge piles.  Work was carried out using a Hutte HBR203 hydraulic diesel powered rotary drill rig. The boreholes were formed using DTH drilling system comprising a 12" Numa hammer with 408mm button bit. 

Also installed were 22 No. 762mm diameter steel piles with socket depths varying from 6.0m to 6.80m from sea bed level.  This work was carried out using a an RH600 piling rig mobilised on a jack-up platform

installation of 48 No. 322.9mm diameter 6.5m deep boathouse support column piles and six 322.9mm diameter 11.0m deep cliff top access bridge piles.

 

Slope Stabilisation

Glen Douglas

The work described here is on a road in the West of Scotland that is utilised by the MoD for critical services. Rock cuttings, up to 14m in height, exist on the upslope side of the road, which is approximately four kilometres in length. Over recent years several small slope failures have occurred on the cuttings adjacent to the road. 

An active mesh and bolt system was installed in several places along the length of the road.

Rest and Be Thankful 2010

The A83 at  Rest and be Thankful in Argyll and Bute has been subject to a number of landslide events, that have caused major disruption to the traffic that regularly uses this key trunk road. The road was closed or several weeks in October 2007 when around 400 tonnes of material were deposited on the road when one such event occurred. Then in September 2009 the road was again closed for 48 hours after 1070 tonnes of material was deposited after a more significant event.

Following the 2009 event a requirement was identified for up-slope protection. An eighty metres long four metre high shallow landslide barrier and a fifteen metre wide VX ‘in-channel’ barrier nearby, both are debris flow barriers although the shallow landslide barriers is for use on un-channelised slopes. These were the first landslide barriers installed in the UK

Sprayed Concrete

Scourie Pier 

Works carried out to reopen pier to the public applying sprayed concrete to stabilize the large voids at the pier head.