47
IN ACTION
d
&
ri
MAY-JUNE 2014
Mini-Dustfighters from DF Ecology are being used by
Società Esercizi Aeropurtuali (SEA), who manages
the two airports in Milan (Malpensa and Linate)
during extensive renovation work at the former.
A significant part of the contract is the removal of
10,000 m
2
(108,000 ft
2
) of indoor flooring and SEA
wished to minimise the effect of the dust generated
by the concrete breaking equipment that was to be
used. Although the working area is enclosed by a
sealed canvas structure, SEA was concerned for the
health of its workforce and the equipment they are
using. The Mini-Dustfighter units will be deployed
at Malpensa during the 18 months that will be
required to complete the work.
Norwegian bridge
challenge for Aquajet
Ltd, together with a bespoke 1.5 m (5 ft)
diameter pile ring multi-modular frame system
with special clamp legs to fix to the column.
The goal was to prepare each column for the
installation of stainless steel reinforcement to
be fixed before reinstatement of a new concrete
casing.
Working remotely from a barge, the
operator was able to set the jet angle,
number of passes and speed of travel of the
hydrodemolition head. The system was set to
make a controlled traverse in a complete circle
of the column, before ‘auto indexing’ to the
next level and continuing until the cycle was
completed – i.e. the length of the Aqua Spine at
6 m (19.7 ft). Divers then released the clamps
and the frame was lowered by crane to the next
level and reclamped. The cycle then continued.
The depth of damaged concrete on the
22 columns ranged between 25-150 mm
(1-6 inches) and in total more than 1, 500m²
(16,146 ft
2
) was successfully treated by the new
Aqua Spine system.
■
Use of the purpose-built Aquajet system eliminated
the need for divers or other operators during
refurbishment operations on the Arstein Bridge in
northern Norway
T
he Arstein Bridge in the north of
Norway was built in the 1940s from
reinforced concrete. It is a single
carriageway structure with 11 pairs of columns
joined at a low level but above water by a
crosshead beam. Each column has a diameter
of 1.5 m (4.9 ft) below the crosshead beam,
tapering to the bridge deck above to a diameter
of 1 m (3.3 ft). The concrete and steel of
these columns had suffered from extensive
degradation, especially around the splash zone.
Specialist UK high pressure water jetting
contractor Rentajet Group Ltd (RGL) was
appointed by Norwegian main contractor
Multibetong to undertake the removal of all
growth from around the columns and any
damaged concrete below the crosshead beam
down to the bed of the fjord, a depth of 16 M
(52.5 ft).
To carry out the work, RGL purpose
ordered the new Aqua Spine system from
Aquajet Systems’ UK distributer, Aquapower
SOCOMEC SPA
MEDESANO (PR) - ITALY
ph. +39 0525 420929
• HYDRAULIC BREAKERS
• DEMOLITION CRUSHERS
• SELECTOR GRABS
• STEEL SHEARS
• SCREENING BUCKETS
• VIBRATING PLATES
STEP BY STEP...
NO WAY TO STOP THEM
