Cable bridge is a new type of cable laying device. In the early 1960s, developed industrial countries developed and gradually promoted the use of cable bridge products. In the early 1970s, China began to introduce cable bridge products. Cable bridge has attracted people's attention because of its low cost, rapid construction, flexible wiring, easy to load, unload and replace, and no location restrictions, and prompted production departments to start research. Making and developing a series of domestic cable bridge products has changed the backward situation of single welding and assembling cable bridge with profiled steel in the past.
Most of the bridges in China are made of thin steel plates, but the development of lightweight bridges abroad has begun, such as aluminium alloy bridges, nylon resin bridges and so on. At present, there are many manufacturers producing cable bridge in China, but not many manufacturers specializing in producing cable bridge for nuclear power plants. Cable bridge in nuclear power plant must have good seismic performance, which is an important condition for safe operation or safe shutdown of nuclear power plant in earthquake. Previous studies on seismic safety of nuclear power plants mainly focused on the main structure, but the research on cable bridge is relatively weak. The seismic design codes of nuclear power plants in our country involve relatively few contents of cable bridge aseismic design, and the unified engineering technical codes for cable bridge used in nuclear power plants have not yet been promulgated and implemented; the main design and manufacturing codes used in production are foreign design and manufacturing codes.
China's energy resources are congenitally insufficient, coal resources, wind power, solar energy and other energy are mainly concentrated in the western and Northern regions, but the service center is in the central and Eastern regions. For large-scale long-distance transmission, the product requirements for cable grid bridge are greater. From the future, the trend direction of our power transmission from west to East and from north to south is greater. From the point of view, it not only satisfies the demand of large-scale and ultra-long distance energy base for point delivery, but also satisfies the demand of high-speed sewing in North China, Central China and East China along the way. It has broad prospects for special HVDC and UHV AC in our country. There is a continuous preparation system adjustment between the two. Integration and development.