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SJS-FP Seismic Joint System
For Plaza Decks & Split Slabs
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Watertight & Traffic Durable
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Watertight and
Static Tie-In to Deck Waterproofing
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Sound Dampened
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No Invasive Cover Plate Anchors
Joint Sizes:
Straddles structural joint-gaps 1"
(25mm)
and greater. Minimum joint gap
between SJS-FP angles is 4"
(100mm)
Movement Capability:
100% Total (+50% and -50% of nominal supplied size.)
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The
SJS-FP System is designed to provide a
watertight, trafficable joint system
in large 4-inch (100mm) and larger
joint openings, in decks of split-slab
design. SJS-FP expands the use of the
SJS SYSTEM to
waterproofed
split-slab
deck designs through the use of side flashing sheets that integrate with
the deck waterproofing membrane.
Uses, Applications
• For new construction and retrofit of old or failed joint systems.
• For restoring watertightness to chronic leaking over occupied spaces.
• Uniquely suited to joint openings designed for seismic separation of
structural building elements.
• split-slab decks
• parking decks
• plaza decks
• podium decks
• airport roadways
• mall bridge connectors
• stadium concourses, etc.
Product Description
• The system consists of two subassemblies: 1) The structural-slab mounted
supporting legs with integral waterproofing side sheets; and 2) the joint
sealing and coverplate assembly.
• The mounting leg assembly is delivered with opposing legs
factory-set to the nominal joint size. It is installed into a wet-setting
bed of epoxy mortar and bolted to the deck.
• The joint sealing and bridging assembly consists of a
central stiffening spline flanked by two watertight silicone bellows
supported by precompressed, impregnated foam shock absorbers, and covered by
a heavy duty coverplate.
• The factory-assembled spline, bellows, foam, are shipped
with factory attached, installation hanger-bars.
• Epoxy gel adhesive is applied to the faces of the previously
installed mounting leg assembly.
• The sealing assembly is lowered into the joint gap where
it self expands into the wet epoxy adhesive.
• Consecutive lengths are joined through the
field-application of manufacturer-supplied, low-modulus, high-movement
silicone to the spline and intersecting bellows surfaces. Friction fit
alignment pins prevent the joins from moving during silicone cure.
• A field-applied silicone sealant band is injected at the
bellows to joint substrate interface to complete the waterproofing.
• The deck waterproofing membrane is installed on the deck
and brought up to the SJS-FP system. With the SJS-FP side flashing sheets
pulled out of the way, the membrane is installed over the top of, and up the
SJS-FP mounting legs. The side flashing sheets are lowered into the liquid
membrane (or into the non sag mastic component of a sheet waterproofing
system) and sandwiched with another layer of waterproofing.
• Concrete, pavers, asphalt, or other topping slab or
wearing course material is installed up to the stainless steel retaining
caps on the SJS-FP mounting rails.
• The SJS-FP joint-sealing assembly installation hanger bars
are removed sequentially as coverplates are lowered over the joint and
screwed to the center spline, completing the installation. |
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The basis of the
SJS-FP System is SJS
SYSTEM which is
comprised of silicone-and-impregnated-foam hybrid components that ensure watertightness, absorb sound, dampen vibration and offer uncomplicated
installation. Created from the
latest evolution in the field-proven technology that EMSEAL
has used for 30 years of sealing horizontal plane joints with
impregnated foam sealants, the SJS
SYSTEM is constructed from two horizontal
joints pre-assembled in parallel adjacent to a heavy-duty extruded
aluminum spline. The spline acts as a receptor for
attaching the surface-mounted traffic plates that bear vehicle and other
loads. The result is a
system that offers features and benefits not found in alternative
products intended for large
horizontal structural joint gaps. |
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Features:
Watertight – The tensionless silicone bellows are installed flush
to the mounting height of the
system and just below the coverplate ensuring watertightness at the
traffic surface. This eliminates the need for ineffective moisture
barriers and secondary gutter systems.
Sound Attenuation – The flanking impregnated foam and silicone
hybrid dampens sound and
shock effectively. When installed over EMSEAL-supplied elastomeric
nosing material, the result is arguably the quietest watertight
coverplate system available.
Self-Locating Coverplate Screws – The center spline is a
continuous receptor for the coverplate screws that are self-tapped into
the anchor channel. This dramatically reduces the installation-related
problems of locating self-centering, sliding ball devices and
pantographs. The probability of screws being left out is eliminated
ensuring proper anchoring.
Self-Locking,
Vibration-Dampened Screws – Vibration in systems that rely on metal-to-metal
connections and contact points is the main cause of screw loosening. SJS
by EMSEAL minimizes vibration through the dampening action of the
massive and continuous springs of impregnated foam along the entire
length of the joint. In addition, 30 pounds of force is required to
loosen the screws offering excellent screw tightness without the need
for thread-lock compounds.
Field-Adjustable
Plate Support – Concrete in new and retrofit applications is
inevitably uneven across and along the joint. The SJS is installed over
a leveling-bed of EMSEAL-supplied elastomeric nosing material providing
the ability to fine-tune the support of coverplate sections
reducing rocking and noise caused by unleveled plates. Systems that
attach or utilize intrusive extruded rails to receive sliding ball and
socket devices cannot be adjusted to eliminate unevenness across and
down the length of the joint.
Continuity of Seal
– All EMSEAL expansion joint systems feature continuity of seal
through
changes in plane and direction –– an essential performance
differentiator. Fabricated transitions
from deck to wall, at curbs, sidewalks, parapets, tees, and crosses are
available with the SJS.
Finite Element
Analysis (FEA) Compiled Safety Factors – Prior to field trials, the
SJS by EMSEAL was modeled using FEA to determine the suitability of
design to worst case possible parking deck loads. Under the scenario of
a 4,000 lb vehicle skidding across the joint system to full stop once
past the coverplate, FEA modeling
predicted lateral displacement of the coverplate of less than 3/4-inches
(19mm) and safety factors in key components as follows:
FEA Safety
Factors:
Traffic Plate - 5; Screws - 11; Spline Pins - 10; Center Spline - 7
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Performance & Selection
Joint Sizes: Because SJS-FP installs into its own legs, the
legs can straddle mean-temperature, structural slab, joint sizes from:
1-inch (25mm) up to 24-inches (600mm). The minimum gap between the SJS-FP
legs is 4-inches (100mm).
For special conditions consult EMSEAL.
Movement Capability: 100% (+50% and -50%) of nominal
material size.
Leg Heights: 4-inches (100mm) to 12-inches (300mm)
Depth of Seal (Foam Depth):
4-inches (100mm) to 8-inches (200mm) wide = 4-inch (100mm) deep
9-inches (225mm) to 18-inches (450mm) wide = 5-inch (125mm) deep
Coverplates:
• Standard coverplate is 3/8-inch (10mm) shot-blasted
aluminum or Type 304 stainless steel. Other custom metals are possible--consult
EMSEAL.
• Coverplate thicknesses can be customized to suit load and
traffic expectations-Consult EMSEAL.
Fire Rating
For SJS models
with up to 2-hour built-in fire ratings see
SJS-FR. |
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Models:
Model selection is designated by product codes. The code
segments relate to the product configuration: For example,
SJSFP-100-400-75 means:
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Product |
Movement |
JointWidth |
LegHeight |
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SJSFP |
100
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400
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75 |
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(100%) |
(4"
joint) |
(75mm, 3") |
Consult EMSEAL for model number suitable to your specific
application. |
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100% free of wax
or asphalt compounds
(Why does
this matter?)
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