PROBLEM TO BE SOLVED: To make it possible to disassemble a bridge floor slab with safety and ease by cutting the floor slab into a plurality of blocks and hanging up the blocks which are going to release the fixture with a reaction leg provided with a reaction jack as a lever. SOLUTION: A concrete floor slab to be demolished is cut into a plurality of blocks 3 where a lifting up hole 4 is bored in each of the blocks 3. Then, reaction less 7 provided with a reaction jack 8 are laid out on blocks 3b which are close to the blocks 3a which are desired to release the fixture with a bridge pier. A removal girder 6 is fixed with a spot between the reaction lees 7 by way of mounting boards 6b. Then, lever means 9, which are connected to the reaction jack 8 and interlocked with the operation of the reaction jack 8, are laid out on the removal girder 6. The blocks 3 are connected to the lever means 9 by way of hang bolts 10 and then the blocks 3 are lifted up with the lever means 9 by operating the reaction jack 8.
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