CONSTRUCTION METHOD FOR COFFERDAM WALL USING STEEL SEGMENT

摘要

PROBLEM TO BE SOLVED: To suppress an increase in a construction period and costs, which are required for a cofferdam construction method.;SOLUTION: A bearing pile 24 is installed on the outside of a place for installing the cofferdam wall 10, and a hanging girder 26 is formed on the bearing pile 24. A steel segment 14 for forming a ring corresponding to one step is suspended on the hanging girder 26, and the steel segments 24 are annularly connected together on the surface of water so as to form the ring 16. The plurality of rings (16A-16D) are stacked on the surface of the water while the ring 16 is suspended, and the cofferdam wall 10 is elongated downward, so that connecting operations and cut-off operations can be facilitated. Since the cofferdam wall 10 is conveyed in the unit of the steel segment 14 to the place for installing the cofferdam wall 10, conveying operations in this case can be easily performed. A load is applied in the direction of pushing down the uppermost ring from the hanging girder 26, in the state of making the lowermost ring 16A abut on a foundation 20 on the bottom of the water. Thus, a section between the cofferdam wall 10 and the bottom of the water can be more surely sealed.;COPYRIGHT: (C)2009,JPO&INPIT