Modular expansion joints own rugged, reliable, scalable device side beams and the beams of 16Mn steel rolling, can withstand high flow, vertical and horizontal impact load large tonnage vehicles. Its anchor member with the beam, abutment of embedded steel welding firm, vehicle load can be reliably delivered to the pier, reasonable structure, durable, applicable to the design load steam - Super 20, the bridge linked to -120. Modular expansion joints with telescopic joints sensitive groups of the unit displacement control system consists of an elastic rubber spring elements, such as PTFE bearing pressure or diagonal support members composed of homogeneous groups of displacement, small telescopic friction resistance. Device installed in the expansion joint sealing corrosion neoprene seal is fitted in the groove of each group of steel beams inside. The entire process by bridge width, with good elastic deformation with waterproof and dustproof function; telescopic device can effectively protect the internal components and beam bottom bracket from erosion. This product is a kind of bridge to make a smooth, comfortable driving the telescopic device can guarantee the free expansion of the beam displacement, but also make the whole deck seams to form a smooth, smooth ride comfort. This product has a displacement volume, select a convenient amount of displacement of the device designed and manufactured by the modulus of from 80 to 1200mm. Bridge design and construction department can be freely selected according to the actual amount of stretching upper structure of the bridge.