AIRPORT, New York, NY—the curve in the departures roadway at the new Jet
Blue terminal is both elegant, functional and ergonomically steers traffic
to optimize flow. The roadway is structurally separated from the terminal
building by an expansion joint. The joint is therefore curved.
Curved expansion joints
can induce complex movements in the joint materials chosen to seal them.
These movements can be managed, however, by a combination of the flexibility
of high-quality materials and through the conservative sizing of the joint
openings in relation to the expected movements. This being done, the
capability of a manufacturer to fabricate and configure the joint system to
follow the curve without compromising watertightness becomes the next
challenge, followed in turn by the installation of the systems by a
EMSEAL routinely handles
curved expansion joints. Outside radii in joints in the vertical plane are
handled through the flexibility of the material in the case of EMSEAL’s
SEISMIC COLORSEAL family of unique
hybrid silicone and pre-compressed foam sealants. In tight curves, notching
of the back of these materials is used to relieve the bending stresses and
facilitate the curve.
Inside radii in the
horizontal plane are handled by EMSEAL’s deck expansion joint systems, like
THERMAFLEX, through the
flexibility of the thermoplastic-rubber extrusions. In in tight radii
conditions the thermo-plastic rubber extrusions can be segmented and factory-welded to follow curves
while ensuring continuity of seal. The curves of joints in ice-floor
perimeters and other horizontal deck joints around curved or elliptical
columns have routinely been handled by EMSEAL’s hybrid foam
materials like the DSM SYSTEM.
In the case of Jet Blue,
the deck design required the use of EMSEAL's
MIGUTAN system for split-slab construction. This is because the
roadways at airports are also roofs. The roofs are over the arrivals area.
There is nothing worse after a long flight and all its hassles than to have
to wait for your cab beneath the icy drips of leaks from above.
roadways are usually designed as split-slabs with a buried waterproofing
membrane on the structural deck and a topping slab as the wear course.
Expansion joints used to isolate the roadways from the terminal building
must be watertight. In order to be watertight, the joint must tie into the
deck waterproofing membrane.
MIGUTAN from EMSEAL was
specifically designed to achieve this incorporation. The principle of
static integration of the MIGUTAN side flashing sheets into the deck
waterproofing membrane is in total contrast to buried flashing sheets,
“band-aid” systems that suffer from tensile stresses during
extension movement and flex-fatigue at the joint edge. The integration into
a sandwich of the deck waterproofing membrane material of the
flashing sheets ensures watertightness while joint movement is accommodated
by the elastomeric insert at the wear course surface.
Following the curve in
the deck is no problem either. Working with EMSEAL's technical staff, the
contractor provided field measurements and condition surveys from which
EMSEAL produced detailed shop drawings showing the configuration of the
materials to handle the radius. The materials were manufactured and marked
according to the shop drawings making installation straightforward and
tighter radii, it is easy to envision EMSEAL's precompressed foam sealants
following the curve. However, even when watertight integration into a
split-slab or plaza deck is required, MIGUTAN can also fit the bill. A
case in point are the concourse joints in the new DC Nationals baseball
park. These joints run tangent to elliptical columns.
made by the contractor for each column became the basis of shop drawings by
EMSEAL. From the shop drawings and using the templates as a quality
control check, unique curved joints were produced for each of the columns.
The curves were
fabricated in all the metal MIGUTAN components including mounting flanges,
retainer legs, stainless steel capping strips, and coverplates, but also in
all of the rubber components that ensure watertightness and continuity of
seal. The rubber components include the side flashing sheets that
integrate into a watertight sandwich with the deck waterproofing membrane,
and in the central sealing insert that bridges the expansion joint opening.
The bottom line is that
through careful joint-gap sizing, material selection, field measurement,
fabrication and installation, watertight, curved expansion joints are both
possible and practical, and for EMSEAL, routine.
Contact EMSEAL for
assistance with your curved expansion joints--we'll bend over backward,
frontward, and sideways for you:
1-800-526-8365 or firstname.lastname@example.org.