Experimental Study On Cast-in-situ Concrete Pier Template And Tunnel Second Lining Shutter Template Construction Mechanical Behavior

With the development of construction industry, construction site the main way of casting has been from the traditional way of manual pouring into pumping concrete pouring, with characteristic of casting speed greatly accelerated, high-speed liquidity and Slump index exceeding the maximum specified in the specification; Meanwhile, at present concrete vibratory completely adopt mechanical, strength, high power, which Influence of the concrete to the template lateral stress, strain and displacement and pressure head change effectively, adopting construction mechanical behavior analysis of the current specification for the template may not be safe, these changes of formwork and concrete construction put forward new problems. Template engineering, as the main flow of concrete construction material, is 40% of the cost of concrete structure engineering construction with safety accidents such as mount because of the unreasonable design of the template at recent years, so the analysis of cast-in-situ concrete template construction mechanical behavior is particularly important.Starting from the factors of affect concrete template construction mechanical behavior, the template in the process of concrete pouring in situ test was carried out to explore the influence of various factors on the template construction mechanical behavior by Changsha kingma JMZX- 5006 am smart string type digital pressure and temperature measurement system and donghua DH3820 stress strain test and analysis system. The biggest formation characteristics and regularity of the lateral pressure template and analysis of the mechanism has been revealed, which concluded that the effective pressure head height; The template is obtained in the concrete pouring process of the changing law of strain and displacement; Revealing the applicability and limitations of each formula is to put forward reasonable suggestions to the lateral pressure specification and obtain the closest formula for calculating the lateral pressure is obtained by comparing calculated value field measured lateral pressure values and norms; To establish a reasonable mechanical calculation model, the force analysis and calculation provides reference for structural safety check; The transverse rib and vertical rib of circular pier restriction in the template has been determined; Analysis of change laws of tunnel car template construction mechanical behavior has been conducted by the finite element software Midas-GTS; Research provides reference value for further research on similar projects.