1. It is used for bridge expansion joints.2. Good quality and competitive price.The scope of application of the joint:We produces a bridge expansion joints are produced by professional rubber-type devices, applied to the volume of ≤ 50mm telescopic following Road and Bridge: BF-type rubber plate in line with the telescopic device, it applies to the volume of ≤ 200mm telescopic following Road and Bridge does not apply to Highway; ZT-SF comb plate steel telescopic device is to be made across the telescopic comb-shaped space, the ride board at the other end of stainless steel, extendable up to 40mm more than the amount used for large and medium-sized long-span bridge; ZT-GQF-C-type (Z-type, F-type, M type, O type) and retractable telescopic device applicable to the volume of ≤ 80mm bridge; The ZT-GQF-MZL type telescopic device is connected by the special steel and machine components modulus of the bridge stretching device, it applies to the volume expansion of 80-1200mm in the bridge; ZT-XF series of telescopic device is parallel to the direction of the bridge joints shaped steel and angle and displacement of supporting me, and it also applies to in the volume expansion of 80-1200mm in bridge engineering.Technical requirements:1. Neoprene rubber used (ie, CR, applied to the temperature of -25 - +60 ) or the use of natural rubber (that is, NR, applied to the temperature of -40 - +60 region)2. Telescopic device used in steel, the quality requirements in line with the GB012, GB374 provisions, the use of special steel, (that is, 16MN or Q345) in line with the provisions of JT/T1591.GQF-C-type bridge expansion devicesGQF-C-type bridge expansion device is adapted to the construction of roads and bridges in China a new type of bridge expansion joint devices. GQF-C-type bridge expansion device using the whole hot-rolled special steel 16Mn, overcome the special steel extrusion line and uneven collection of size characteristic