| 摘要 |
PROBLEM TO BE SOLVED: To provide a floor lifting apparatus which can easily lift a settled earthen floor slab, and to provide a floor repairing method which can easily and positively inject mortar into a gap between the earthen floor slab and the ground. SOLUTION: To carry out the floor repairing method, the lifting apparatus 1 is used, which is constituted of a long nut 3 being dividable and having a plurality of engaging pieces 7 protruding from its lower end, and a bolt 2. According to the method, the divided nut pieces are inserted into a repairing insertion hole formed in the settled earthen floor slab, one by one, and connecting ribs 5 are bound by means of respective screws 6 to thereby form the long nut. Then, a quilt is rotated, and by using a reaction force of the ground and the long nut engaged with the periphery of the repairing insertion hole of the earthen slab, the earthen floor slab is lifted. Further, a void portion is formed between the ground and the lifted slab, and mortar is injected from a plurality of insertion holes, to thereby repair the floor.
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