Flexibility and movement are a necessity in bridge construction, whether a steel-bridge, a concrete highway overpass, or a bridge for a railroad. Without the ability to flex and move, the structural integrity of the bridge can be compromised, and eventually lead to failure. Fabreeka supplies bearing pads, both fixed and sliding, for bridges around the world. Fixed bearing pads, such as Fabreeka preformed fabric bearing pads and SA-47 random oriented fiber bearing pads are used on bridges to support uneven load and rotation on steel to steel or steel to concrete connections. These bearing pads, also known as bedding pads, provide uniform load distribution on highway and railroad bridges and reduce vibration by adding damping to steel structures. Fabreeka’s expansion bearings, or slide bearings, can be used on steel and precast concrete bridges. They offer a durable sliding surface with a low coefficient of friction to allow for thermal expansion and contraction in bridges to minimize structural stresses. Fabreeka type SBX expansion bearings include the company's own preformed fabric bearing pads to allow beam rotations created by loads. SBX expansion bearings also provide an even distribution of loads between members, and vibration is reduced by adding damping to steel structures. Fabreeka designs and manufactures custom expansion bearings to your specifications, including bearings with ultra-low coefficient of friction and bearings for high temperature applications.
Bridge Rail Pads
Fabreeka’s Bridge Rail pads have simplified the installation of railings as our SA-47 pad is supplied to the exact size and shape of the rail support contact area. This pad evenly distributes the loading and hold-down forces from the bolts by conforming to the irregularities of the surfaces in which it makes contact. Durable and dependable, Fabreeka bridge rail pads exhibit high compressive strength and a limited creep characteristic. These differentiating factors set them apart from the standard unreinforced neoprene pads, as well as making them a great alternative to epoxy and grout installations.
Lamp Post Pads
Fabreeka’s Lamp Post pads are an excellent and economical way to reduce shock and vibration induced by wind and traffic. Depending on the height of the pole and state specifications, pads made of either Fabreeka pad or SA-47 are supplied to the exact size, shape and bolt hole-pattern of the lamp post base. Lamp post pads help to evenly distribute loadings and adapt to any irregularities in the concrete mounting surfaces while providing damping to reduce post motion. Additionally, Fabreeka washers and bushings are utilized to completely isolate the lamp post from transmitted vibration.
Fabreeka’s Drain Trough material is manufactured into a flexible water drainage system for use on bridges and overpasses. Designed for installation under the expansion joint fingers, these flexible troughs channel water into rigid down spouts and avoid water dripping on vehicles passing under bridges.
For decades, Fabreeka International has been successful in vibration isolation and reducing structure-borne noise in buildings. With the combined effort of our expert engineering staff and an extensive selection of materials, we provide solutions to the many needs and challenges facing construction in the modern world. Our fixed bearing pads, whether Fabreeka or SA-47, support uneven load and rotation in steel to steel or steel to concrete connections, and provide even load distribution between members. Bearing pads reduce vibration on building floors, diminish structure-borne noise, and protect structural integrity by absorbing movement and deflection caused by movement. Fabreeka provides structural expansion bearings, or slide bearings, for numerous building applications. These expansion bearings allow thermal expansion of beams and other members, and they permit beam rotations caused by loads and have a low coefficient of friction which minimizes structural stresses. A building’s foundation can also require isolation from external vibrations such as traffic, trains, subway cars, or nearby construction. Fabreeka has several foundation isolation products to isolate the building base from these disturbing influences. Internal sources of structure-borne noise and vibration in buildings can come from mechanical rooms or elevator rail cars. Fabreeka reduces these noise and vibrations to provide a more serene environment for adjacent penthouses, offices, hotel rooms, or any other living spaces that could be adversely affected. Today’s engineers and architects are well aware of the benefits of energy efficiency. One way to enhance energy performance is by adding a Fabreeka-TIM structural thermal break, which is a load bearing thermal break that is used between flanged steel connections. This energy saving product maintains structural integrity while reducing energy transfer through the building envelope. This thermal bridging solution can be used on balconies and canopies, or other steel members protruding through the building envelope. For structural connections in compression, such as column bases, roof equipment, dunnage post support, and foundation connections, Fabreeka-TIM RF can be used to reduce thermal energy transfer. Additionally, Fabreeka-TIM series products can bring you a step closer to achieving LEED certification.
Steel stacks and towers have relatively low inherent structural damping; therefore, excessive top-of-stack deflection can happen at critical wind speeds due to vortex shedding. To keep deflection within acceptable parameters, damping must be added to the “stack-foundation-soil” system. One way to achieve this is with stack foundation dampers. A ring of Fabreeka preformed fabric pad is placed between the stack base plate and concrete foundation. Additionally, Fabreeka washers are installed between steel washers/plates under the anchor bolt nuts. Introducing damping to the structure minimizes amplification at resonance, therefore creating a more stable structure.
Fabreeka-PTFE bearing pads are comprised of the original fabric reinforced, elastomeric pad developed by Fabreeka in 1936. The unique PTFE bearing pad is manufactured with a Teflon® surface for use in expansion bearings and pipe slides.
Fabreeka-PTFE pads are installed as well to accommodate construction irregularities such as rotation and non-parallel load bearing surfaces, while each Teflon® pad also provides a sliding surface to accommodate expansion.
Can the Fabreeka-PTFE bearing pad material be cut to size in the field?
Yes. The Fabreeka-PTFE material can be cut to size in the field using a band saw. Care should be taken so as not to damage the PTFE.
Can holes or slots be cut in the field?
Yes. Holes or slots can be cut or drilled in the field using a fine tooth hole saw.
What is the recommended thickness of PTFE pad for use in a pipe clamp application?
Recommended thickness depends on the pipe diameter. Please contact Fabreeka’s Engineering department at 1-800-322-7352 or email@example.com for assistance on your application.
What is the purpose of the PTFE surface when the material is used in a pipe clamp?
PTFE (Teflon) surface provides a layer of insulation for the Fabreeka pad. PTFE can be exposed to 400°F, while the Fabreeka pad is limited to 220°F. PTFE also allows for the pipe to expand/move within the clamp by providing a low coefficient of friction.
What epoxy/adhesive should be used to bond PTFE pad to steel?
Fabreeka #700 Epoxy should be used to bond Fabreeka-PTFE pad to steel. The bottom of the Fabreeka pad should be buffed and the steel surface roughed up or sandblasted.
What type and thickness of PTFE should I use for my application?
The Fabreeka-PTFE pad type and thickness depends on the application. When used in a structure as an expansion bearing with rotation, the thickness of the Fabreeka-PTFE pad is calculated using the design guidelines in the Fabreeka structural expansion bearings literature .