Arro-Cad
Limited
Operations: Bretby Business Park, Ashby Road, Bretby, Derbyshire,
DE15 OYZ
Tel (01283) 558206 Fax: (01283) 558207 email: enquiries@arrocad.co.uk
Head Office: Langwith Junction, Mansfield, Notts. NG20 9RN
Tel: (01623) 747466 Fax: (01623) 748197 Arro-Cad Limited
A few Contract Profiles
Please click on a thumbnail picture to view a larger image
'A Sign of the Times'
Recent successful contracts include the signage steelwork for
a premier hotel in London .This involved an 
extensive
site survey to determine existing supports. The information was
transferred to usable survey drawings and enabled the incorporation
of site work drilling information.
The contract, although a relatively small tonnage, was challenging
in that it involved curved fascia steel which had to be accurately
aligned with a central support structure.
This braced central structure had to clear the existing concrete
duct supports yet still retain room for an internal floor, handrailing
and access ladder.
The Units were pre assembled and lifted in to their 10 storey
high positions.
We found 'Strucad' clash detection and 'Struwalk' mode of particular
help to eliminate clashes.
An archive set of all the completed drawings in DXF format was
issued to our client using the useful 'spf to dxf ' programme
within Strucad.
A New Restaurant for Thames Water
This challenging structure was surrounded on three sides by 
reinforced
concrete walls and was to be completely glazed.
The curved trusses were supported at the ends by a stepped truss
assembly and at 3rd points by forked tubular struts emanating
from 2 central column supports. The whole structure was braced
with CHS and stainless tie wires with Architectural clevis and
pin details.
Although not heavily loaded, the structures Architectural statement
required aesthetically pleasing connections. These were developed
directly with the Architect , Engineer and in accordance with
our clients design criteria.
To facilitate an early scheme approval, colour jpeg images were
emailed to the professional parties for their comments. This
helped confirm the connections were acceptable prior to completion
of all of the details.
Red Lion Business Park
Two portal frame structures were Recently completed as a design
and build package at the Red Lion Business Park in Surbiton.
Each structure comprised contrasting bands of vertical and horizontal
cladding plus glazing panels.
Roller shutter doors were incorporated beneath feature canopies.
Exposed steel stair cases & specialist handrail served First
floor mezzanine areas to each unit. Ultimately, this contract
proved to be very demanding from the point of view of incorporating
the structural requirements into acceptable architectural solutions.
3 New Amenity Buildings
The one pictured in our archive is one of 3 new amenity
buildings
which combined a single storey roof structure surrounded
by a mono pitched roof with an interesting elliptical centre
area constructed of curved trusses. It was all finished off with
an
elevated RHS Entrance at the front of the building.
The most demanding aspect on this contract was the 'multi -radius'
elliptical inner curve which not only needed to follow a precise
internal line but had to interface with the incoming roof beams
at nodes.
Once we had determined the set out, it was then not only used
in the 3D model, but was also transferred to the ' 2D' environment
for use in the curved truss assemblies and finally to drawings
issued for the Main Contractor to match the curve in the tiled
floor finishes.
Circular Tower Platforms
Bespoke bent triangular supports dominated this structure, which
were braced and wrapped themselves around a heated pipe stack.
Particular attention had to be paid to expansion and contraction
in the pipe support. This resulted in slotted connections which
not only had to support the structures design weight but also
give sufficient support to handrails and flooring.
Each platform was connected to the main supports via pre welded
tabs and were bridged with vertical catladders.
Interconnecting structures completed previously by our client
were interfaced as 'dummies' in our model to ensure correct union
of the two areas.
Dana Glacier Vandervell Bearings
A 330 tonne architectural
industrial building. The roof structure is supported by a combination
of heavy spliced
trusses twinned with rafters, these varied in
design with CHS RHS & UC sections being utilised.
The central plant level area forms a recess in the roof, the
sides of which are supporting trusses canted over at 12 degrees
to pick up the incoming supports and provide a face
for curtain walling fixings.
A heavy mezzanine floor covered the majority of the buildings
footprint.
