Language: English
Bridge repair,protection,structural strengthening
Bridge retrofitting
Bridge reinforcement is to restore or improve the bearing capacity of existing bridges by strengthening the components and improving the structural performance. Main ways of bridge strengthening technology to strengthen the weak components, auxiliary components, change the structure of system and reduce the dead load and reinforcement of pier and foundation.
Generally speaking, bridge structural reinforcement is to restore or improve the bearing capacity of existing bridges by strengthening the components and improving the structural performance, so as to extend their service life and meet the requirements of modern transportation. At present, the bridge at home and abroad are the main ways of strengthening technology to strengthen the weak components, auxiliary components, change the structure of system and reduce the dead load and reinforcement of pier and foundation.
The bridge has serious shortcomings or because of heavy vehicle traffic and can not meet the safety requirements of the weak component bearing, new materials are usually taken to increase the beam into the main arch section; with high grade cement mortar or epoxy resin cement mortar filling cracks, additional external tendons, external prestressing, or by chemical binder paste the additional member to the bridge reinforcement.
When the bridge bearing capacity is insufficient or the bridge is damaged for a variety of reasons, new force components can be added to the original structure. If the longitudinal beam, the beam or the arch rib is added. The new prefabricated components can also be used to replace the original structure with serious shortcomings and not easy to repair. When replacing components, sufficient temporary support must be set up and reliable technical measures are adopted to ensure the safety of the whole structure in the construction.
Is mainly to change the structure of the force system using continuous beam or beam plate combination and arch effect, improve the stress condition of the bridge structure, in order to improve the bearing capacity of the live load. If the beam into continuous beam, the articulated to steel joint, the use of Auxiliary Pier, splayed support will become multi span single span beam structure, and the arch bridge of cast-in-place reinforced concrete slab, the arch structure into beam system etc..
To reduce the constant load of the upper structure of the original bridge, the force condition of the original bridge can be changed and the ability to bear the live load can be improved. Especially limited in bridge foundation bearing capacity of soft. It can not meet the requirements of bridge strengthening the upper structure and increasing the bearing capacity of live load. It is an economic and effective measure to improve the capacity of live load by reducing the dead load of bridges.
There are quite a few shortcomings of the bridge and disease is the problem caused by poor or pier foundation, for this type of bridge is usually taken by reinforced concrete building, reinforced concrete rod and steel rod is applied to increase the zhuangmu and push method of bridge pier and foundation reinforcement of prestressed pier and foundation, and improve the force the status, improve the bearing capacity of the bridge.
