| 摘要 |
To provide a sewage disposal tank which is directly injected into an underground space without various preparation operations for construction of the sewage disposal tank so that a sewage disposal tank structure is constructed in the space. The sewage disposal tank is characterized in that it is formed in a prefabricated synthetic resin tank body, wherein the prefabricated synthetic resin tank body comprises: a wall body(33) along the circumference of which vertically and horizontally grooved steel sections are installed to compensate bending stress and shear stress relative to horizontal and vertical discharge pressures; one or more decomposition tanks divided by partitions(35a,35b,35c) to treat the sewage step by step after receiving sewage flown in along a sewage inflow pipe(34) installed on the wall body; training walls(36a,36b) vertically projected in an inner space of the decomposition tanks to pass the sewage to a succeeding decomposition tank; a pre-filter tank(38) which is installed at a position adjacent to a final decomposition tank to primarily filter the sewage treated in the decomposition tanks, and in which a plurality of crushed stones are filled such that the crushed stones are supported by a support; a filter tank(39) in which a plurality of crushed stones supported by a support are filled to filter again the sewage passing through the pre-filter tank; and a drain space formed by distancing a space between the support installed on a lower part of the filter tank and the wall body to drain the sewage through the filter tank.
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