During the "Eleventh Five-Year Plan" period, China's energy industry adhered to the policy of "optimizing the development of thermal power, developing hydropower in an orderly manner, actively developing nuclear power, accelerating the development of gas power, and vigorously developing wind power." At present, China's power generation installed capacity is 800 million kW, ranking second in the world. As of the end of June 2010, 23 nuclear power plants were under construction, accounting for 40% of the 57 units under construction in the world. During the “Twelfth Five-Year Plan†period, China’s nuclear power construction will enter a peak period, and offshore wind power projects will be intensified. It is estimated that by 2015, the total installed capacity of power generation in China will reach 1.26 billion KW, ranking first in the world. In order to meet the development of the national economy, the power industry will maintain a certain growth rate. The Chinese government has officially promised to the world that by 2020, the carbon dioxide emissions of GDP will fall by 40% to 45% compared with 2005, and non-fossil energy will account for about 15% of primary energy consumption. To achieve the above goals, we must increase energy structure adjustment and vigorously develop new and renewable energy sources. The proportion of installed nuclear power will be prioritized, and the proportion of nuclear power in total installed capacity will reach 5% or more in 2020; to expand the scale of nuclear power generation from the current 1 million kilowatts to 1.7 million kilowatts, the investment will be much larger than originally planned. 7,000 to 750 billion yuan; to build an annual capacity of more than 10 million kilowatts per year, to build 6 to 7 "wind power and three gorges"; water and electricity will compete for 300 million kilowatts in 2020; further implementation of the West-East Power Transmission and other key points The project will realize the optimal allocation of power resources in a wider scope and promote the scientific and economic utilization of hydropower; coal power generation should implement the policy of large-scale and small-scale, eliminate backward production capacity; encourage the construction of high-efficiency and environmentally-friendly generator sets with low energy consumption and large capacity, and actively Promote the integration of coal and electricity. The adjustment of the energy structure has expanded the market space for the energy equipment manufacturing industry and created new market opportunities for the machine tool industry. China's energy equipment manufacturing industry has invested heavily at the end of the "Eleventh Five-Year Plan", but with the investment in clean energy such as nuclear power and wind power, large castings and forgings, ring bodies (such as steam turbine casings), large and complex parts, Large-scale flat and semi-circular machining, blade and root processing, and various pump bodies, pump and valve manufacturing, etc., for heavy-duty vertical lathes, large-scale floor milling and boring machines, ultra-heavy gantry milling machines, five-axis linkage machines, and CNC broaching machines. A variety of high-end vertical and horizontal machining centers, as well as the corresponding CNC tools and measuring instruments, will present new demands.
Steel box girder and steel and concrete composite box girder are used for large spans, which need to minimize the weight of the bridge, and their excellent high torsional stiffness is particularly useful. The clean lines of the box girder bridge usually have no obvious external hardening. It is generally considered to have excellent appearance and durability, and it has no traps for dust and moisture. Box-shaped cross-sections are sometimes used as compression members, such as in cable support structures or arched towers.
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