Study Of Assembled Small Water Tank Structure

At present, China harvesting rainwater mostly used the clay, cement mortar or concrete spread plate the building of water tanks and cisterns surface to impermeableness, as storage facilities. For current water tank has too long building time, high investment, deeper water tanks or cisterns have construction risk and need the technically demanding, difficult to ensure the construction quality of large-scale, easily leak after build the water tank and the water quality can not be guaranteed, the quickly build water harvesting technology is the urgent requirement of developing technology of rainwater utilization. Through field research, theoretical analysis, structural calculation and so on, we studied out spot assembled water and obtained the following conclusion:(1) This paper developed a new multiunit material with bamboo and plastic water tank, by solving the problems of tank construction——difficulty to construction, high costs and lack of structure and size theoretical basis. Firstly, this paper had calculated the stress distribution of two water tanks with the same wall though analyzing the water tank structure by ANSYS software. The results showed: the ability of octagon assembled water tank suffering from stress is superior to the ability of hexagon assembled water tank; the pulling and crushing stress consisted in the panel joints and the bottom of two kinds of water tanks. Then, this paper carried on the structure and size optimization design of octagon water tank, with the minimum of water tank materials used as the objective function and allowable stress of the material as the constrain condition, satisfying the intensity and rigidity conditions of water tank, there were five difference assembly programs, respectively assembled octagon water tank, adjunction a enclose hoop assembled water tank, partially-thick assembled water tank, adjunction two enclose hoops assembled water tank and adjunction a enclose hoop partially-thick assembled water tank. The results showed: partially-thick octagon assembled water tank of the multiunit material with bamboo and plastic need less material; the least thickness of wall is 7.2 mm under unload, the least thickness of wall was 6.3 mm under full-load. So the new assembled water tank of multiunit material with bamboo and plastic could be built.(2) This paper invented a new hollow PVC-U plates intertwined water tank. This paper analyzed the structural stress of the different breadth depth ratio (1/2, 1/1, 2/1) and different thickness(12, 16, 21, 27, 31, and 36 mm) hollow PVC-U plates intertwined water tank by ANSYS software. The results showed: the stress consisted in the bottom of cylindrical water tank. No-load is the most unfavorable conditions. Water tank has a capacity of 10 m3 the breadth depth ratio is 2/1, which stress satisfied the specification under the no-load when the wall of water tank is 31 mm and 36 mm. This paper optimized design with the lowest cost for objective function in order to reduce the cost of the tank. The results showed: the water tank has the lowest cost and satisfied strength and rigidity requirement when 1.17 m in radius, 2.43 m in height, 12 mm thickness of tank wall, and has a the 27 mm in thickness and 0.382 m in height of enclose hoop. Based on this, hollow PVC-U plates intertwined water tank could be built.(3) Developed ANSYS calculate model of new assembled water tank. This research solved new type water tank structure calculation problem, through ANSYS analysis to creation water tank ANSYS model, used its built-in parameters of language APDL to creation ANSYS order flow, on this basis use UIDL interface to design language, make these calculation system to menu and function dialog box, add to ANSYS interface, this way not only reduce the workload, but also improve efficiency.(4) Evaluated the applicability of the new water tank. Through evaluated the applicability of difference material water tank, and compared with concrete and brick water tank, multiunit material with bamboo and plastic water tank and PVC-U winding water tank had low cost, economic efficiency, lighter transport, easier to installation, saved construction work hours and short construction period advantages. Compare with soft green rubber water tank, they were high cost and low economic benefits, but they had better vertical performance and easy to promotion. Preliminary think spot assembled water tank has a good applicability.