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An expansion joint on the Cornish Main Line, England. If a railway track runs over a bridge which has expansion joints that move more than a few millimeters, the track must be able to compensate this longer expansion or contraction. On the other hand, the track must always provide a continuous surface for the wheels traveling over it.
Pin and hanger assembly. A pin and hanger assembly is used to connect two plate girders of a bridge.These assemblies are used to provide an expansion joint in the bridge. One beam (the anchor span) is set on a pier with a short section cantilevered out toward the next pier.
A breather switch, expansion joint, or adjustment switch is an intentional gap in railway tracks to allow for thermal expansion in long sections of otherwise unbroken rail. . They are placed between very long sections of continuous welded rail or at the transition from continuous welded rail to jointed track, and commonly in the vicinity of bridges, viaducts and tunnels where the ...
mageba was founded in 1963 in Bulach, Switzerland. By 1969 the company was designing and manufacturing a variety of bridge bearings and expansion joints, [4] and had heavy duty testing facilities in operation. [5] In 2004 the company merged with Proceq. [6] The resulting company continued to design and manufacture bridge bearings and expansion ...
The standards are a combination of a variety of expansion joint manufacturers' knowledge and experience. [2] [3] The EJMA organization performs extensive technical research on a variety of topics concerning the design and manufacturing of expansion joints. [4] This knowledge contributes to providing new versions of the EJMA book of standards.
The viaduct was opened in November 1975. The bridge has had problems with corrosion since it was opened and repairs have been necessary at times. [3] Expansion joints cracked allowing de-icing salts to wash from the bridge carriageway into the piers, cross beams and columns giving rise to extensive chloride attack.
Slip joints are common under conditions where temperature changes can cause expansion and contraction that may overstress a structure. These are generally referred to as expansion joints . Bridges and overpasses frequently have sliding joints that allow a deck to move relative to piers or abutments.
An expansion bearing on the Queen Elizabeth II Metro Bridge. A bridge bearing is a component of a bridge which typically provides a resting surface between bridge piers and the bridge deck . The purpose of a bearing is to allow controlled movement and thereby reduce the stresses involved.