Repair methods for underwater concrete structures

Abstract

This invention provides a method for repairing underwater concrete structures that allows for easy and reliable repair of areas requiring repair, while minimizing the risk of the repair filler material falling off after repair. [Solution] A method for repairing a part requiring repair formed on the bottom surface 1a of a concrete structure 1 underwater, comprising: a filling space formation step of chipping away the part requiring repair to form a filling space A for a repair filling material 4 having an opening 3a on the bottom surface 1a of the concrete structure 1; a filling space shaping step of forming an inclined surface 3b that expands upward on the entire circumference or part of the inner surface of the opening 3a; a repair filling material filling step of filling the filling space A with the repair filling material 4; and a filling space closing step of closing the opening 3a from below with a bottom plate 5 and placing a buoyancy body 7 filled with air below the bottom plate 5, thereby pressing the bottom plate 5 against the opening 3a with the buoyancy of the buoyancy body 7.

Claims

1. A method for repairing a part requiring repair formed on the bottom surface of a concrete structure underwater, A filling space formation step involves chipping away the area requiring repair to form a filling space for a repair filling material having an opening in the bottom surface of the concrete structure, A filling space shaping step is performed to form an inclined surface that expands upward on the entire circumference or part of the inner surface of the opening, A repair filler filling step, in which the repair filler is filled into the aforementioned filling space, The process includes closing the opening from below with a bottom plate, and placing a buoyancy body filled with air below the bottom plate, thereby pressing the bottom plate against the opening using the buoyancy of the buoyancy body to close the filling space. A method for repairing underwater concrete structures, characterized by the following:

2. When the filling space has a side opening that opens to the side surface of the concrete structure, The filling space closing step includes, in addition to closing the opening from below with a bottom plate and placing a buoyancy body filled with air below the bottom plate so that the buoyancy of the buoyancy body presses the bottom plate against the opening, the step of closing the side opening with a side plate. The method for repairing underwater concrete structures according to feature 1.

3. A resin sheet material is interposed between the opening and the bottom plate. The method for repairing underwater concrete structures according to feature 1.

4. A resin sheet material is interposed between the opening and the bottom plate, and between the side opening and the side plate. The method for repairing underwater concrete structures according to feature 2.

5. The repair filler filling step involves filling the filling space with a volume of repair filler exceeding the volume of the filling space, such that the repair filler protrudes from the filling space. A method for repairing underwater concrete structures according to any one of features 1 to 4.

6. In the filling space closing step, when the opening is closed from below with the bottom plate, it is confirmed that the repair filler material does not protrude from the opening. If the repair filler material does not protrude from the opening, the repair filler material filling step is performed again. The method for repairing underwater concrete structures according to feature 5.

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