| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for binding concrete caissons for an open-shield method, which can reduce the number of the caissons to be removed, which can simplify a structure, which imparts a specified tension so that a column of the concrete caissons can be fixed, and which enables the concrete caisson to be surely anchored in a prescribed position. SOLUTION: In this method for binding the concrete caissons 4 for use in the open-shield method, a binding bolt 14 is screwed into an insert 12 which is pre-embedded in the joint end of the concrete caisson 4; a leading end of the bolt 14 is protruded forward from the joint end; a protruding end of the bolt 14 is inserted into the next concrete caisson 4 which is laid ahead of the above concrete caisson 4; a nut 16 is attached to the protruding end of the bolt 14 so as to be temporarily fastened; a shield machine is propelled by the reaction from the concrete caisson 4; in the state of the action of an axial compressive force on the rear concrete caisson 4, the nut 16 pre-attached to the leading end of the bolt 14 is finally fastened so that the concrete caissons 4 in front and rear positions can be bound together. COPYRIGHT: (C)2008,JPO&INPIT
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