News - August
2007
Works at
Heathrow on the T3 futures project for Laing O'Rourke included
this month a huge wire sawing operation to remove a 12lm capping
beam and a secant piled wall below. An existing passenger subway
(which remained operational throughout the works) had to be penetrated
to connect a new passenger walkway to the front of T3 at sub basement
level. Concrete Cutters helped to produce a phased method statement
to ensure the safe divorce cutting of the structure to ensure minimal
disruption to the passengers. A diamond wire saw was deployed to
form 7 cuts in the capping beam which measured 1.6 x 1.8 x 12m or
approx 86 tonnes. The beam contained 40mm dia reinforcing bar. 150tonne
cranes were deployed to remove the cut sections of the capping beam
before the piles were cut flush to floor level. All the works were
carried out within programme and our employer and client BAA were
pleased with the results.
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Juliet
taxiway at Stansted airport will have the existing SR13 AGL
CL (Airfield ground lighting - Centre Line.) seating rings changed
for ADB HPI 8" bases and we are delighted to have been awarded
this contract by Dyer & Butler. Due to start in September some
378 seating rigs will be removed whilst not interfering with the
operation of the busiest taxiway at the airport. Concrete Cutters
were chosen to carry out this work because of their speed of operation
and proven accuracy of optical alignment.
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Optical
Alignment; Last years runway refurbishment on Stansted
airport saw concrete cutters remove 1350 existing AGL seating rings
and replace them with ADB 8" and 12" seating rings. Seating
rings are the steel machined or cast bases which we are responsible
for installing. They are inset into the runway/taxiway and held
in place by highly specialist mortars and grout Specialist large
coring machines are used to form the recess for bedding. These seating
rings hold in place the luminaries ( fitted by Electrical contractor)
which guide the aircraft and need to be aligned to setting out points
with +/- 0.5 deg of tolerance on azimuth and perfectly level. Concrete
Cutters use a special optical alignment device which is extremely
accurate to achieve this. On completion the alignment of the seating
rings are independently checked by a special mobile monitor which
completes a MALMS test (Mobile Airfield Light Monitoring System)
to identify successful accuracy of our orientation using position
sensor array. Photometric equipment is also used to measure
the lux, and beam intensity. Any failures in accuracy must be removed
and corrected prior to hand over. This can cause serious disruption
on tight project programmes.
Upon completion at Stansted
Runway 23-05 in 2006 after installing 1275 new seating rings during
short nightshift possessions handing back to live operational status
at 6am each morning, we are proud to report we did not have one
single failure. Special thanks to all our operatives and supervisors
and in particular Steve Barber and Dean Gregory.
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