The lengths of structural elements, and of superstructures in particular, change as a result of materials shrinkage, temperature fluctuations and loading variations – perhaps many times in the course of their lives. To avoid surface cracking and possibly more serious damage, the length of each individual structural element is often limited, with gaps between elements to allow movements. These gaps must be bridged over, and made trafficable if appropriate, in every state of expansion. Expansion joints of steel or aluminium offer well-proven solutions. These facilitate variations in length without constraints and cracking, protect the surfaces of adjacent structural elements, and, if necessary, prevent the ingress of water.
This expansion joint is a kind of highway bridge expansion joint product which is designed according to the principle :When high elasticity of rubber changes with temperature, the bridge floor will generate expansion deformation. The rubber expansion joint has the advantages of convenient installation, stable and smooth running, waterproof, dust-proof, low noise, light weight and low cost. When install this product, the bolt hole and the joint of each meter will be filled with adhesive,which can assure the products has good water-proof property. This product is made by aging resistant and wear-resistant rubber .It can withstand load of vehicles repeatedly and has a long service life.