Coarse grid sunk well for physically processing waste water and construction method thereof

The invention relates to the technical field of underground project structures, in particular to a coarse grid sunk well for physically processing waste water and a construction method thereof. The coarse grid sunk well is a cavity structure which is formed by three layers of reinforced concrete structures. The structure of the first layer is a trapezoid, the left side and the right side of the trapezoid are provided with a plurality of connection pipelines, the upper part of the trapezoid is provided with a corresponding rectangular structure of the second layer, and the upper part of the rectangular structure of the second layer is provided with a corresponding rectangular structure of the third layer. The middle part of the coarse grid sunk well is provided with a horizontal partition, the coarse grid sunk well is divided into two groups of tank bodies through the partition, and the groups of the tank bodies are independently operated. Eight small lattices are arranged in the coarse grid sunk well, the sizes of the eight small lattices are different, and the gravity is offset. The construction method of the coarse grid sunk well comprises a step of preparing at early stage and a step of respectively constructing the three layers in batches. The invention has a simple and firm structure and wide application range, does not need arranging guide pipes and guide pipe platforms, does not need divers to work underwater, has visual concrete casting, controls the quality, saves the investment, improves the efficiency and reduces the risks.