Editor’s Choice
Helifix structural repairs
reinstate arches at historic Ally Pally
As part of a refurbishment and restoration
programme at the world famous Alexandra
Palace, structural repair experts, HELIFIX,
devised a bespoke repair solution to
strengthen an arch window and two adjacent
minor arches on the north-west tower.
Historic movement of this Grade II listed
building had caused loss of compression in
the arches, allowing them to relax and move.
The Helifix engineered design permanently
and innovatively tied the three arches together,
addressing both structural and aesthetic
requirements, enabling previously added brick
and steelwork to be removed and the original
window opening to be reinstated.
A combination of Helifix masonry repair
products and concealed installation
techniques were used.
HeliBars were bonded into the mortar beds
above the arches to reinforce the masonry,
create deep masonry beams and spread the
structural loads. Fully grouted CemTies were
installed up through the arches to secure them
to the masonry and support the lintel loads.
Once the HeliBars and CemTies had been
installed the infill brickwork and steel beam
were removed.
Careful alignment of two 7m long SockFix
bars, virtually hidden from view, were carefully
installed through all three arches and
positioned in line with window transoms.
Once the repairs were completed, the historic
arches were reinstated, the original window
frames retained and the tower’s aesthetics
and original materials were preserved.
For project-specific technical advice about
the use of Helifix concealed structural repair
products and techniques contact the Helifix
team on 020 8735 5200.
Alternatively, go to www.helifix.co.uk for full
product information, relevant literature and a
wide range of case studies.
Tel. 020 8735 5200
email : [email protected]
Web. www.helifix.co.uk
LIMESTONE SANDSTONE
BUILDING STONE FLOORING WALLING
MASONRY LANDSCAPING RESTORATION
01386 584384
www.stonequarries.co.uk
www.refurbandrestore.co.uk - 11