Design and Construction of Sewage Structures Under High-Level Underground Water Conditions Using theTop-Down Method: A Case Study of Sewage Pumping Station PS2 in Dorood City

Abstract

In this paper, various issues related to the design and construction of a pump station under high-level underground water conditions in Dorood City using different approaches are investigated. These methods include deep wells, sheet pile walls, and secant walls. By evaluating the deficiencies of these methods in dealing with high-level underground water conditions, a new approach called the Top-Down method is studied and introduced; it was previously presented for the construction of caissons and buildings. In comparison to other methods, the advantages and disadvantages of the Top-Down method are evaluated, leading to its selection; Subsequently, the problems, including the waterstop placement system and construction details were addressed and modified. Architectural and structural details for the construction of such structures applying the Top-Down method were then presented in the research. Finally, the efficiency and robustness of the proposed approach in the design and construction of concrete sewage structures exposed to high-level underground water, are demonstrated from the technical and economic perspectives, construction time, costs and safety level.

Keywords

• pumping station
• sewage
• top-down method
• high groundwater level