Hydraulic mechanism and method for lifting and lowering floor slabs

A hydraulic mechanism for lifting and lowering a plurality of floor slabs, comprising:

• a Foundation-floor slab, columns serving as lifting columns, and the plurality of floor slabs, wherein:
• the columns are inserted through openings of the plurality of floor slabs to be lifted;
• lifting rails are disposed inside the columns, outer surfaces of the lifting rails are provided with step-shaped, one-way self-locking teeth for mounting hydraulic jacks;
• floor slab struts are disposed within a hollow space of the columns to connect a first floor slab of the plurality of floor slabs with a second floor slab of the plurality of floor slabs to maintain a distance between the plurality of floor slabs during lifting and lowering operations, wherein, by means of the floor slab struts, when the second floor slab is lifted, the second floor slab correspondingly pulls up the first floor slab, wherein the first floor slab is lower than the second floor slab;
• pins are provided to stop/hold the plurality of floor slabs at predetermined height positions on the columns;
• the Foundation-floor slab is provided with steel plates at positions where the Foundation-floor slab connects to the columns.