 |
|
|
|
|
|
|
|
|
|
|
 |
|
|||||||||
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
|
 |
 |
|
||||||||
News Archive, 2001 to 2003
| September 2003 | SBMA's acknowledged in new anchor publication. |
| The use of the efficiency factor and the multiple anchor concept have been acknowledged in the ground anchor technology section of 'Geotechnical Engineering Handbook' by Ernst and Sohn, published in 2003. | |
| September 2003 | Latest SBMA anchor contract in Singapore |
| L&M Geotechnics from Singapore have been awarded further anchor works using high capacity SBMA removeable anchors | |
| September 2003 | Latest SBMA anchor testing in USA |
Testing has now been completed on SBMAs in the US. These have been installed on the Long Island Expressway, New York and US Capitol Visitor Centre, Washington D.C. The anchors were installed by Nicholson Construction Company.  | |
| April 2003 | SBMAs exhumed and Reported. |
| Ground anchors in Chalk are provided with a much better understanding in Barley, Mothersgille and Weerasinghe July 2003 paper in 'Geotechnical Engineering'. Exhumation and inspection includes conventional and SBMA anchors.(Synopsis) The full paper can be viewed on www.theanchorman.com
| |
| December 2002 | 'Ground Engineering' article. |
| 'Ground Engineering' publish a brief summary of the development of the removable SBMA anchor system. (View)
| |
| November 2002 | First large scale removable SBMA contract in Singapore |
| The first large scale fully removable SBMA contract is approaching completion in Singapore. L & M Geotechnics have already installed over 1000 anchors with working loads of up to 1500 kN. The patented SBMA system again allowed a gross reduction in the number of anchors required to provide the retention forces.
| |
| September 2002 | Keller continue to install SBMAs. |
| Keller Ground Engineering continues their extensive use of SBMAs in the UK and Ireland. Since first usage in 1988 Keller have installed over 20,000 multiple anchors and subjected 70 trial anchors to investigatory tests to determine the precise performance and ultimate bond capacities.
| |
| September 2002 | Keller continue to install SBMAs. |
| SBMAs are currently being installed using a driven casing system in weak soil but still providing working loads of 500kN.
| |
| August 2002 | First post-grouted SBMAs in USA |
| The first use of post-grouted single bore multiple anchors in the USA has been completed in Michigan. The satisfactory completion of a trial anchor in firm-stiff clay demonstrated high capacity and no problem with creep losses. Lang Tendons Inc. provided the corrosion protected anchor tendons and stressing technology under their agreement with SBMA LLC.
| |
| April 2002 | Post-grouted SBMA test anchors 0n M11, UK |
| Single bore multiple test anchors have been constructed at the Stansted Approach on the M11 motorway to stabilise an existing motorway bridges. The anchors, founded in firm to stiff sensitive clays, required repeat post-grouting operations. Two trial anchors confirm good performance prior to production works.
| |
| December 2001 | 'Multiple Choice', New Civil Engineer, December 2001 |
| An article by Margo Cole cites comments from four engineers regarding the SBMA anchor system :
David Clubb, Portsmouth City Council chief engineer. 'With SBMAs we could do the job with only a quarter of the number of anchors because they are much more widely spaced.' Dr. Donald Bruce, president of Geosystems in Pittsburg : 'The prime advantage is that achieving higher capacities means that you can reduce the number of anchors required, so the owner gets substantial cost savings - and potentially time savings.'
Professor Stuart Littlejohn, University of Bradford : 'believes that engineers will specify SBMAs regularly once they have seen enough examples of the anchors being used in different soils, and they fully understand how the system works.'
Professor Ostermayer, Germany's leading anchor technique and research expert : 'The system will become accepted on a worldwide basis and may be used on a large percentage of anchors founded in soils and weak rocks.'
| |
| December 2001 | Single Bore Multiple Anchors in Dublin |
| SBMA tests revealed that a four unit anchor achieved a total load of more than 5000kN. 'This is probably the first ever soil anchor to demonstrate a capacity of 500t with the ability to sustain a permanent anchor working load in excess of 200t,' says Barley.
| |
| October 2001 | More Trial SBMAs in Singapore - removal demonstrated. |
| Four trial anchors installed to demonstrate the high working capacity and totally removeable anchor system were recently completed by L&M Geotechnics in Singapore under the watchful eye of the Land Transport Authority. Very short anchors achieved loads of 2400kN(540kips) without failure, prior to removal of the complete prestressing strand tendon.
| |
| September 2001 | First Permanent High Capacity SBMA Works Finished in Singapore. |
| 167 permanent anchors in very weak sandstone supporting a bored pile wall have been completed to produce an exceptionally fine finished appearance (see photo of completed works by L&M Geotechnics). All anchors in the three rows were provided with double plastic long term corrosion protection A 45o slope, soil-nailed in the mid-1980's, was replaced by a 15m high bored pile wall retained by three rows of anchors. Initially 800kN working load anchors were required but SBMA and L&M Geotechnics jointly proposed using the multiple anchor system. This meant half the number of anchors, with double the working load, could be used, said SBMA managing director Tony Barley. Anchor trials in May achieved 4500kN without failure and work was completed in October.  | |
| July 2001 | SBMA LLC formed in US. |
| Tony Barley and Donald Bruce have formed a new company solely for the marketing and promotion of the SBMA system in the United States. The two men jointly carried out anchor research for their post-graduate studies under Stuart Littlejohn in the 1970's. Don Bruce, now a well known geotechnical expert in the USA and worldwide, also co-authored 'Rock Anchors - the State of the Art' with Stuart Littlejohn.
| |
| May 2001 | First High Capacity SBMAs in Singapore |
 L & M Geotechnics, an approved licensee for use of the SBMA system, have achieved a test load of 4500kN (1000kips)without failure in very weak sandstones in Singapore. This high capacity allowed L & R to halve the number of proposed anchors on their permanent anchor project using double the original anchor working load
| |
| April 2001 | Conference organisers invite SBMA presentation |
| Tony Barley was invited from the audience to make a presentation on his special high capacity SBMA System including the permanent double corrosion protected and the temporary removable type at the 16th Christian Veder Kolloquium 'Anker und Zugpfahle in der Geotechnik' in Gratz. The meeting was organised jointly by the Institit fur Bodenmechanik und Grundbau and the Institut fur Felsmechanik und Tunnelbau specifically to assess modern anchor technology.
| |
| Feb. 2001 | SBMA reach 5000kN (1125kips) in soil. |
 In November 1994 Tony Barley predicted that "Given suitable ground conditions, there is no reason why we cannot achieve working loads of 2000kN(450kips) and ultimate loads approaching 5000kN" (New Civil Engineer, 24 November 1994, "Multiple Choice").Trial SBM anchors in Dublin have been pressure injected in fine grained sands and the SBMA System has now achieved the phenomenal ultimate capacity of 500 tons/5000kN/1125kips......Yes, and in soil not rock!
| |