His Highness Sheikh Khalifa Bin Zayed Al Nahyan ... - Mabey Bridge

Case Study
His Highness Sheikh Khalifa Bin Zayed
Al Nahyan Bridge, Pakistan
Country Pakistan
Product Mabey Delta Bridge
Installation time 56 days
Completion date May 2012

Case Study
His Highness Sheikh Khalifa Bin Zayed Al Nahyan Bridge, Pakistan
The Challenges
In 2010 the annual rainy season in Pakistan caused
great devastation and damage to vital infrastructure.
The Swat Valley in the Khyber-Pakhtunkhwa province
was badly affected, and a multi span concrete slab
deck bridge over the River Swat near the town of
Barikot was severely damaged, leaving only one short
span in place. Due to the importance of the bridge as a
key supply route, a rapid replacement was essential.
The United Arab Emirates, which funds many charitable
causes, was approached with a view to funding a
bridge replacement project managed by the
engineering and construction branch of the Pakistan
Army. Manpower was to be provided by the Pakistan
Army Corps of Engineers and the finished structure was
to be named ‘His Highness Sheikh Khalifa Bin Zayed Al
Nahyan Bridge’, also known locally as ‘Gammon Bridge’.
Top: Launching the bridge with nose attached.
Above Left: Separating the bridge into individual spans and
jacking down.
Above Right: A view of the underside of the bridge showing
plan bracing. Swaybracing is connected diagonally between
the transoms to provide a lateral bracing system to resist
transverse loads such as wind loading. Vertical Bracing is
connected longitudinally between the top of one transom and
the bottom of the next transom to form a longitudinal bracing
system which resists braking/traction forces.
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The Solution
The Mabey Delta Bridge was selected for speed of
installation and for its full highway load capability.
The structure is fully galvanised to ensure a long design
life with minimal maintenance. Once intermediate piers
and abutments had been reconstructed, work began
on building the bridge, starting with the launching nose.
With only limited mechanical equipment available on
site, the 24-strong workforce, assisted by a Mabey
Bridge Site Advisor, began constructing the bridge one
bay at a time on top of launching rollers.
Upon completion, the bridge was launched over the piers
as a continuous structure using hauling rams supplied by
Mabey Bridge as part of the launching and erection
equipment. As the bridge reached the landing abutment,
the launching nose was removed and the team began
the operation of separating the bridge at each pier into
individual spans and jacking them down onto bearings at
each abutment and pier location.
Once the bridge was in place, the deck units, parapets
and the external footwalk were fitted and the approach
roads at each end completed. Solar powered street
lights were installed and the bridge was ready to be
officially opened on 25 May 2012. Total installation time
was just 56 days, with the entire project completed only
eleven months from the start of pier construction.
The Result
The finished bridge is a permanent, two-lane structure
with an external pedestrian footwalk. The overall length
of the bridge is 328.5m, divided into five spans of
around 65m each.
About The Mabey Delta Bridge
The Mabey Delta Bridge is a positive cambered heavy-duty
modular bridge system specifically designed for high traffic
volumes and heavy loadings. This system is particularly
excellent for solving long spans or multi-lane traffic
requirements. The delta can carry up to 4 lanes of traffic and
can span up to 90m between supports.
MabeyBridgeLtd
Limited