MM SYSTEMS EXPANSION JOINTS PDF!
Expansion joints. Longitudinal movements of between and 1, mm. Modular joints . Control Systems of Modular Expansion Joints(PDF, Kb). Since MM Systems Corporation has provided architectural, exterior Joints, all engineered to meet each project's specific conditions & movement criteria. PyroFlex® Floor The Pyro-Flex Floor Fire BarrierProtection System is an engineered high performance fire resistive system for sealing expansion joint openings.
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They stop the bridge from bending out of place in extreme conditions, and also allow enough vertical movement to permit bearing replacement  without the need to dismantle the bridge expansion joint. There are various types, which can accommodate movement from mm systems expansion joints to 1, millimetres 1.
Modular expansion joints are used when the movements of a bridge exceed the capacity of a single gap joint or a finger type joint. A watertight system, invented by the Swiss company Mageba, is designed on a modular basis and can be tailored to satisfy the specific requirements of almost any structure.
The total movement of the bridge deck is divided among a number of individual gaps which are created by horizontal surface beams.
The individual gaps are sealed by watertight elastomeric profiles, and surface beam movements are regulated by an elastic control system. The drainage of the joint is via the drainage system of mm systems expansion joints bridge deck. Masonry[ edit ] Clay bricks expand as they absorb heat and moisture.
MM Systems - West Pacific Coatings
This places compression stress on the bricks and mortar, encouraging bulging or flaking. The wooden expansion joint compresses as the concrete expands.
Dry, rot-resistant ceder is typically used, with a row of nails sticking out that will embed into the concrete and hold the spacer in place. Control joints are cut into pavement at regular intervals to control cracking.
MM Systems | Rowe Fenestration inc.
Concrete and asphalt have relatively weak tensile strength, and typically form cracks as they age, shrink, and are exposed to environmental stresses including stresses of thermal expansion and contraction. Mm systems expansion joints the control joint, cracking can occur in a random fashion, and compromise the surface of the structure.
This is primarily an aesthetic issue. Control joints attenuate the cracking in a more controlled fashion. The cracks will tend to form along the cut planes that makes up the control joints.
This even, regular cracking, which is also hidden in the crevice of the joint, has a better appearance than random hairline cracks. Roadway control joints may be sealed with hot tar, cold sealant such mm systems expansion joints siliconeor compression sealant such as rubber or polymers based crossed linked foams.
Control joints mm systems expansion joints have adequate depth and not exceed maximum spacing for them to be effective. Typical specifications for a four-inch-thick slab are: On the other hand, the track must always provide a continuous surface for the wheels travelling over it.
These conflicting targets are served by special expansion joints, where two rails glide along each other at a very acute angle during expansion or contraction.
MM Systems Expansion Joints
They mm systems expansion joints typically seen mm systems expansion joints one or both ends of large steel bridges. Such an expansion joint looks somewhat like the tongue of a railroad switchbut it has a completely different purpose and operation. Ducted air systems[ edit ] Expansion joints are required in large ducted air systems to allow fixed pieces of piping to be largely free of stress as thermal expansion occurs.
Bends in elbows also can accommodate this.
Example of air or gas ducts can be seen here.