Daebong B.M.Tech DBR1 ~ DBR30

1. Summary Rail Type Expansion Joint(DBR) is used to distribute the expansion behavior of an upper structure of bridge equally to multiple rail beams. It is applicable to all bridge types ranging from small bridges to very long span bridges. It is designed and constructed to support safe vehicle traffic and minimize vehicle impact by absorbing a variety of bridge displacements, such as expansion & contraction and rotation, smoothly and maintaining surface smoothness. It also has the structure to block leakage on the bridge surface perfectly and to prevent corrosion and ageing of various facilities of bridge. 2. Features The waterproof rubber seal between rail beams is put in the rail groove processed in the same way as a rubber seal, playing its waterproof role perfectly. So it secures the durability of the lower structures of bridge. The spacing system installed on the bottom of rail beams equally distributes the whole expansion behavior. For the semi-permanent use of structural steel parts, elastic parts with excellent attenuation are applied. It is possible to make continuous use only by replacing parts.  Rail-Type Expansion Joint uses only the parts that passed strict tests. So, it is possible to endure various environmental and physical conditions during the endurance life of bridge. In addition, the expansion joint is applicable regardless of a bridge type. In short, it is usable without the limitation of expansion length (at least 50 mm). The gap between rail beams is max. 80mm according to field conditions. The number of rail beams and the number of waterproof rubber seals depend on expansion length.  Expansion & contraction and rotation in all directions (longitudinal, transversal, and vertical)  Full waterproof function  Customized design  Installation in all types of bridges  Elastic parts with excellent load attenuation  Approved high-quality materials 3. Waterproof For the implementation of the perfect waterproof function of expansion joints, waterproof rubber seals are put in the rail grooves processed in the same way of rubber seals. So, water leak is perfectly prevented. It is easy to assemble and repair the diamond-shaped waterproof rubber seals that have the excellent function to prevent water from leaking to the bottom of an expansion joint. 4. Anti-corrosion As for the surface treatment of structural steels, hot dip galvanizing is applied to prevent salt stress and corrosion in accordance with KS D 8308 Standards. Compared to coating, this treatment guarantees excellent corrosion-resistance and adhesion. The thickness is 85μm, ensuring about 45 years of endurance.