|
Triodetic space frame structures
offer a
competitive solution for long
span stockpile enclosures and
for tank roofs in bulk materials
mining, processing & terminal
facilities. Triodetic
space frame design
domes,
composite shapes, & longitudinal
enclosures are available in
Galvanized Steel, Stainless
Steel, Aluminum, Timber &
Polycarbonate to suit almost any
structure size, load or
corrosive environment. |
|
|
ñ
Back to top
|
Toroids for 200' x 500'
enclosure (160,000mt)
Span: 60m (200ft), Rise: 30m
(100ft)
Seismic Zone 4
Owner: Minera Escondida Limitada
(MEL)
Project Partners: BHP Billington,
Duke
Power, Fluor Daniel Chile,
Bechtel,
Yolles, Cade-Idepe Montayes
Delta
Limitada, Santiago Chile |
 |
 |
|
  Stockpile
material is deposited via the 8m
x 9m roof gantry along the crown
of the structure. These severe
line loads & dynamic forces are
transmitted to the foundations
via 14 lateral steel arch
trusses spaced 12m apart. The
design allows for any single
truss becoming ineffective in
the event of equipment
malfunction. Triodetic framing
between the trusses is designed
as a series of curved single
layer shells (toroids) spanning
200ft x 50ft and rising to 100ft
at the roof apex. The frame
sections were all pre-assembled
at ground level & sequentially
positioned with stand-off
brackets to accept linear
horizontal purlins, curved
decking & translucent panels.
The end walls are designed as
vertical two layer space frames & were installed as two
pre-assemblies. The walls
require no intermediate
foundations & can be re-located
in their assembled state in the
future when the stockpile &
building length are extended.
Other advantages of the Triodetic solution beyond the
prime purpose of dust
suppression, included avoidance
of scaffolding & working at
height, reduced foundation loads
versus an A-frame building
alternative, added space for
material handling equipment, and
an efficient construction
sequence that held this activity
off the project critical path. |
ñ
Back to top
|
 |
DOME Stockpile Enclosure
Owner: Minera Argentina Gold
S.A.
Engineer: SNC Lavalin,
Toronto
Diameter: 50m (150ft),
Rise: 27m (80ft)
Designed for seismic IV,
unbalanced snow & 145mph wind
loads |
 |
|
This
dome space frame design
covers a gold are stockpile
for a 36,000 t/day processing
plant, 380 km north west of San
Juan Argentina in the Andes
mountains at altitude 4100m
(13450ft) above sea level. Dome
materials were available on site
commencing 10 weeks after
drawing approvals. Construction
was completed in less than 5
weeks by local crew of 10 under
the direction of a Triodetic
supervisor. |
ñ
Back to top
|
 |
Dome Roofs
Owner: Fording Coal, B.C.
Engineer: SNC-Lavalin,
Edmonton
Fording River: 52m
(171ft) dia.
Greenhills: 50m dia (160'
x 44'h),
30m dia (100' x 27'h)
Cladding: Curved
Corrugated deck
with tapered cover panels |
 |
|
Safety nets were used under the
dome space frame
assembly to allow
Fording operations to continue
uninterrupted. To accelerate
construction, each dome was
assembled in two halves - as an
annular ring on tank wall &
crown caps for the 50m & 30m dia
domes (15000 & 5000lbs) were
assembled separately, lifted to
position & connected to their
base rings. Domes were designed
for 110psf unbalanced snow load
and reactions at the base
perimeter were no more than
10kips horizontally & 25kips
vertically at each of the 64
footing attachment points for
the larger dome. These forces
were approximately half these
values on the smaller dome.
Frame assembly with a crew of
3-6 men was completed in around
5 weeks, once panel installation
commenced a crew of 9 completed
the deck in 10 days.
Spaceframes |
ñ
Back to top
ç
Back to Photo Gallery Main Page |
