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A expansion joint, or movement joint, is an assembly designed to hold parts together while safely absorbing temperature-induced expansion and contraction of building materials. They are commonly found between sections of buildings , bridges , sidewalks , railway tracks , piping systems , ships , and other structures.
Multi-purpose customized waterstops may also function as shuttering or crack-inducer for cold joints. Hydrophilic or "water-loving" waterstops are strips of rubber, modified with a hydrophilic agent (such as bentonite) so they swell in the presence of moisture to effectively seal concrete construction joints.
Construction programs of Rubber Bridge Expansion Joints: (1) Set out and cut Modular Bridge Expansion Joint. (2) Excavate and clean the Modular Bridge Expansion Joint area. (3) Drill holes to locate the anchor bolts. (4) Place the rebar mat and mold. (5) Pour bottom concrete layer. (6) Install comb-shaped steel plate. (7) Pour side concrete. (8 ...
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 purpose of the elastomeric bearings is to support a bridge or other heavy structure in a way that permits the load to shift slightly, in a horizontal direction, relative to the ground or foundation. Without such bearings, the bridge support might crack or fracture when it moves due to ground movements or thermal expansion and contraction.
The omission of the expansion joint removes a significant maintenance and durability issue, as it serves as a point of ingress for road salts which allows the abutment, piers and deck soffit concrete to come under chloride attack that can cause degradation and eventual span failure. A 1989 British study showed that the majority of expansion ...
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