Template works in reinforced concrete construction application of a reasonable, project template (forwork) refers to the newly poured concrete molding template and a set of templates supporting structure system, Truss and to link pieces of metal annex, bridges, supporting system for sliding template, Since the template was created to enhance motivation and the upgrading of planes, platform Template works in the concrete construction of a temporary structure template classification of the various types of stages : According to shape into planar surfaces and template template two; by force into loading conditions and non-load-bearing template (that is, to bear the weight of cement and concrete side pressure); According template material into wood, steel template, template combination of steel and wood, concrete gravity template, reinforced concrete inlaid face template, Alloy template, plastic template; According to the structural characteristics and use demolition shift into fixed-two; according to a sliding special function template, vacuum sucker vacuum or floppy disk template, template insulation, steel trolley and so Second, China in the 20th century, the 1960s before the construction of water conservancy and hydropower projects have primarily used a wooden template, Because wood is easy to make into a variety of shapes, some of the special shape of the structure, such as hydropower stations tail pipe concrete pouring, usually adopt timber production template, there are still many modern countries, many water conservancy and hydropower project template or use of wood composite structure of steel and Since the 1970s, China in the concrete dam construction used large steel and wood template mixed concrete (prefabricated) extensive development of a subsequent slide templates and hence the concrete pouring process of 1973 Danjiangkou Reservoir downstream water diversion project Pai River was hollow pier shafts, using a sliding formwork construction 1975 Miyun Reservoir spillway weir and the steep chutes steep concrete lining, use running along the track of the trailer sliding plate template, 1997 change in curvature of the complex-arch dam gate used by the construction of the slipform, During this period there are shafts and tunnels, channels, trash rack works using sliding formwork The end of the 1970s, China's implementation of replacing wood with steel technology policies, combined steel template used as the basis for the majority, columns, beams, plates, Construction of the wall, , in particular hydropower project for the massive concrete construction, has an obvious 1946 in the Wolf Creek Dam (worf creek) in the first use of cantilever template, and then in use continuous improvement, China in the 20th century, the 1950s have used half the Cantilever template, the mid-1970s, started development of steel cantilever template, As concrete construction template loading is very frequent, the United States in the early 1970s and developed in Germany live Shack gravity dam, Anchoring the use of automatic or cantilevered from the template, make a very good technical and economic 3, the template works has been seriously and strive to enhance and improve its work and the use of performance and concrete construction in the importance are First, hydraulic concrete formwork construction cost very high, or about the total cost of the concrete 15 -30% In the absence of reinforcement bars or less of massive concrete works about 5 -15% Fabrication and installation template labor consumption of about 28% -45% (one concrete on the amount of labor), and consume a large amount of quality steel and timber, and the following table : the role template, but also often in control of the construction progress, Massive concrete in construction, according to the statistics, the template dismounting time, Construction of the total cycle of 35% Template processes in many cases network diagram of the construction of the key lines, Process Improvement template can often speed up the construction Water conservancy and hydropower project template status, but also from abroad concrete dam construction experience to see, Below are the foreign Engineering template for the construction project cost