The Study On Cast-in Concrete Form Work Lateral Pressure Theory And Formula

Cast-in concrete formwork engineering as an important process in building engineering, it directly affects the reliability of construction quality and template support. With the increase in species of modern construction technology changes, additive, performance index of current concrete has greatly changed. The main factors affecting the concrete to form lateral pressure for the casting speed, pouring of concrete slump height, etc., especially additive greatly affected the slump of concrete. In addition, the vibration of concrete the tamping type entirely by mechanical type, high strength, high power. The improvement and construction technology of the concrete performance index of the effect of the pressure of cast-in-place concrete to the template."Construction formwork safety technical specifications" (JGJ 162-2008) gives two formulas, a coefficient formula, is a formula of liquid pressure. Template engineering support is not enough for template construction accidents often occur, has brought the enormous economic losses and security threats to human life. With the application of concrete structure more generally, template engineering becomes more and more important in the application and research of construction of template, side pressure has become an important task of formwork engineering. Study on the template side pressure not only provides secure formwork construction of data, but also provides a reliable support measures for formwork support.Based on the experiment results, in the field test, the earth pressure distribution at different heights and distribution at the same height in different position of collected data as the basis, research "construction formwork safety technical specifications" (JGJ 162-2008) two calculating formula gives the value which is more close to the cast-in-place concrete the actual stress value. According to the test data, cast-in-place template pressure actual value maximum and regulate the liquid pressure formula gives close, in the actual construction process using liquid pressure formula can provide reliable support measures for formwork construction.In the actual construction process, construction templates "safety technical specifications" (JGJ 162-2008) is smaller by two formulas for calculating the values of actual template construction. The research results of this paper will provide reliable basis and delete the basis for "influence coefficient formula of construction formwork safety technical specifications" for the actual construction, is not in the actual construction to consider to choose which formula is close to the real trouble, direct use of liquid pressure formula in calculation.