Introduction to the replacement of rubber bearings
(1) using the support of a large tonnage jack up a bridge across the bridge
Provide sufficient bearing capacity for ease of installation and support, to the reinforced concrete foundation is arranged on the bracket. The bracket is based in the river, the foundation is relatively weak, low bearing capacity and uneven foundation. In its will have large uneven settlement. In order to reduce settlement, we must increase the size of reinforced concrete foundation, and the support for pre pressure. This scheme in large quantities, time is lengthened, low security, high cost.
(2) the ultra-thin Jack pier and support from the top of the bridge with the dial gauge to make full use of the girder and the pier top space, using the ultra-thin jack support from the top of the bridge pier, with a height of 70mm, circular flat type hydraulic jack =300mm in diameter (the maximum lifting weight is 250t, the maximum stroke is 15mm) with electric pump synchronous bridge jacking, observation beam by using a dial indicator rise speed, to ensure the bridge girder force uniform
Laminated rubber bearing is widely used at present almost everywhere in the world. As early as in a railway bridge in France in 1936 on the outskirts of Paris began to use the rubber bearing, after the Second World War, Britain, Germany, the United States, Japan and many other countries have the use of plate rubber bearing, but it was not until 1958 that the real accumulation of Ding the extensive use of the experience. Especially the French Fuliexinnie proposed steel grille or plate is arranged in the rubber, method for lateral expansion of the bound rubber, so that the rubber bearing has been developed rapidly.