Analysis and Research on Structural Characteristics of Three-grid Septic Tank Produced by Rolling Plastic Process

The three-grid septic tank has become a common equipment in the process of rural toilet reform due to its low cost and small footprint. However, because it usually adopts the construction method of filling and deep burial, the three-grid septic tank collapses and leaks phenomenon, which seriously affects the service life of the septic tank. In this paper, ANSYS finite element analysis software was used to simulate the deformation characteristics of three-lattice septic tanks with different wall thickness and groove depth. The simulated surface was as follows: a septic tank with a diameter of 0.83m and a volume of 1.5m3, when its wall thickness was 8mm, the septic tank shape variable was the smallest. When the groove depth increases from 30mm to 50mm, the septic tank shape variable shows a trend of first increasing and then decreasing, that is, appropriately increasing the wall thickness and groove depth of septic tank can effectively solve the problem of septic tank deformation.