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Archtec in the USA
Newcomers Mill Bridge (route MD 733A) on the old National Highway is close to Frostberg, Garrett County in Maryland. The Bridge is one of seven remaining stone masonry bridges in the county constructed between 1813 and
1850. It is a single span masonry arch bridge over the Savage River and has significant historic value. The arch barrel is constructed from random rubble with squared voussoirs. Spandrell walls and parapets are built from roughly squared rubble. At
the time of Cintec's inspection (Nov 1999) the southern spandrel wall was in a serious state of disrepair and in imminent state of collapse. A submission was made to Maryland State Highway department and after the installation of over 45 Cintec
anchors, some measuring up to 28 ft. in length, masonry repairs and low pressure grouting this Historic bridge is once again safe.
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Archtec in Australia
The "Red Bridge" across the Elizabeth River at Campbell Town in Tasmania is the oldest surviving brick arch bridge in Australia. It consists of three segmental arch spans of 7.6 metres (25 feet) and was built by
convict labour between 1836 and 1838 using red clay sandstone for the piers, abutments and cappings. The Tasmanian Department of Infrastructure, Energy and Resources which controls the bridge, required a contractor to take responsibility for the
design and construction of rehabilitation and strengthening works which would restore the original structural integrity of the bridge and strengthen it to take modern heavy vehicles, which are presently up to 62.5 tonnes on 9 axles in the
"B-Double" configuration. Part of the "wish list" also required strengthening to the new SM1600 loading, which allows for future increases and has loads in excess of 36 tonnes on a 3-axle group. Analysis by Gifford and Partners
has shown that strengthening to the required SM1600 loading is possible.
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Archtec Installation: UK
Built of random whinestone, these two spans of over 7m (23 ft.) were assessed as having a carrying capacity of 7.5t. The bridge is located in a rural environment with no alterative route for some users. Therefore ARCHTEC
was chosen in order to cause minimal disruption to traffic and for it's environmental advantages - a saddle system would have been very disruptive. Scottish Borders Council was restricted to a two-week window of opportunity in order to suit the
local farming community. The bridge was completed on time and to budget and was organized so that it remained open to traffic throughout the process of installation.
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Netted: Ireland
Bridging a busy single-track railway line, a rating of 10t was assessed for this single 8.6m (28 ft.) span, masonry structure. Strengthening to a rating of 40t was required. Twenty-six 3m reinforcement anchors were
installed to achieve this new load capacity. The holes are made with non-percussive diamond drills causing very little vibration, however in order to minimize the risk of debris falling onto the track, 'fortrac' netting was fixed to the underside of
the bridge during the installation process.
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Listed: Wales
This historic structure became the first ARCHTEC project in Wales and required the listed building consent of Cadw. The bridge remained open throughout with the central holes being drilled at night. Twelve anchors,
averaging 7m (23 ft.) in length were used for strengthening and three longitudinal anchors for barrel stabilization. |
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