Construction of Steel Pipe Sheet Pile (SPSP) Foundation
Bago River Bridge spans across Bago River and connects Thanlyin Township and Thaketa Township in Yangon. The total length of the Bridge is 1,781 meters. The River at the Bridge is 1,587 meters wide. The bridge has one main span of 224 meters wide and height clearance of around 13.5 meters during highest tide. The project is financed by ODA Fund of Japan.
Antara Koh was employed by the Main Contractor, Sumitomo Mitsui Construction Co., Ltd, as the specialist sub-contractor to carry out the construction of 15 foundation Piers in the Bago River. Each pier was made up by driving of Steel Pipe Sheet Pile (SPSP) to form a cofferdam for each Pier. The steel pipes were 1,200mm diameter and the length of the piles varied from 45m to 75m. A total of 1,394nos of piles were driven for the 15 piers. The piles were installed in 3 sections for Package 1 piers on Thanlyin side and 2 sections for Package 2 piers on Thaketa side due to different pile design capacity requirement. The lowest section of the piles were pitched accurately by using of high pressures water jet and then driven by a hydraulic vibro-hammer. The middle section of the pile were welded by the semi-automatic GMAW welding method and then driven by a hydraulic vibro-hammer for the 3 section type of piles. Thereafter, splicing for the last pile section was carried out using the same welding method and then driven by a hydraulic vibro-hammer to 7.2m above the final elevation. Then, the piles were driven to final elevation using either Delmag D128 Diesel Hammer or IHC S280 Hydro Hammer. Antara Koh completed the construction of 15 river piers two months ahead of schedule despite COVID-19 disruption.