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Preparation of Drawings
Drawing Production Services for Curtain Wall
Fabricators, Facade Contractors and Wall System
Suppliers
We can provide all of the technical
drawings you need to secure approval of a wall
system's design, to procure materials, to
fabricate components, and to assemble a
complete facade. For your project, PTCC is
able to prepare all of the following
documentation: -
Tender Drawings
Strongly PTCC advises that, each time a bid is
submitted for a facade construction contract,
drawings should be included to define the
systems that will be supplied for the project.
These tender-phase drawings are an important
reference for use after the contract has been
awarded, during design negotiations with the
building owner's consultants. Without such a
reference the design approvals process is
always more arduous and protracted. For a
typical, flat facade at a high-rise tower, a
package of a dozen drawing sheets might be
sufficient at the time of tender, and PTCC
charges only a modest fee for this sort of
submittal.
Bracket Layout Drawings
The first sets of drawings which PTCC will
prepare for a new project are plans
showing the shape and locations of the
embedded metal connectors that are cast
into a concrete-framed building, or the
brackets attached to a steel structure,
for attachment of curtain walls or
claddings. Usually this information can be
presented using a few drawing sheets for
each floor of the building.
Shop Drawings
The geometry of the building's facade, and the
design of the assembled wall system at each
location, are shown in shop drawings
(sometimes called the "approval drawings").
Shop drawings are provided also for
performance mock-up and visual mock-up
specimens. Normally, all of these drawings
have to pass through a process of formal
review by the architect and his consultants.
For a flat, rectangular, high-rise tower, a
couple of hundred shop drawing sheets might be
sufficient to document fully the curtain wall.
For larger or more complex projects, the
number of sheets may be in the thousands.
Component Fabrication Drawings
In a traditional metal fabrication workshop, one
drawing — showing cutting dimensions and
machining details — is required for each
unique component that is to be manufactured. PTCC
can prepare these fabrication sheets, as well as
the associated assembly drawings. Also, if you are
using computer-controlled tools then after
studying your production processes we can provide
digital files formatted for direct input to your
CNC machines. Automated manufacturing procedures
of this sort reduce cost because they eliminate
the need to employ machine programmers on the shop
floor, and because it is is possible to reduce the
number of human-readable fabrication drawings
which have to be prepared in the drafting office.
The number of different parts in a building's
envelope, and hence the cost of the fabrication
drawings, varies greatly with the shape of the
facade. Repetitive, flat walls might be
constructed using only a few dozen fabrication
drawing sheets, but for a large and geometrically
complex project the number of unique components
may be in the hundreds of thousands.
Die Drawings
After a new curtain wall or cladding
system has been designed, PTCC can provide
drawings showing the dies through which
the aluminium profiles and rubber gaskets
will be extruded. We have considerable
experience in developing wall systems and,
when trial metal samples become available
we can check dimensional tolerances and advise
on die corrections if required. Before a
prototype facade is constructed at a test
laboratory we can test the structural
properties of the metal and the effectiveness
of gasket seals.
3D Studies
Facade areas which are difficult to visualize
when drawn in two dimensions, complicated
assembly details, and intricate components can
be presented in isometric studies, or can be
modelled in 3D using CAD.
Material Listings
When it is time to procure materials for
construction, PTCC can provide detailed
material quantity take-offs, as well as
cutting lists for glass panes or cladding
sheets.