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An apparatus for flattening a half-dry concrete floor includes a plurality of pressure rollers arranged such that axes of them are parallel with one another in an imaginary plane, a holder rotatably supporting the pressure rollers at opposite ends of the pressure rollers, an oscillation-transmitter

An apparatus for flattening a half-dry concrete floor includes a plurality of pressure rollers arranged such that axes of them are parallel with one another in an imaginary plane, a holder rotatably supporting the pressure rollers at opposite ends of the pressure rollers, an oscillation-transmitter formed integral with the holder for transmitting oscillation to the pressure rollers, and an oscillator for oscillating the oscillation-transmitter.

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1. An apparatus for flattening a half-dry concrete floor, the apparatus comprising: a plurality of pressure rollers arranged such that axes of said pressure rollers are parallel with one another in an imaginary plane;a holder rotatably supporting said pressure rollers at opposite ends of said pressu

1. An apparatus for flattening a half-dry concrete floor, the apparatus comprising: a plurality of pressure rollers arranged such that axes of said pressure rollers are parallel with one another in an imaginary plane;a holder rotatably supporting said pressure rollers at opposite ends of said pressure rollers;an oscillation-transmitter connected to said holder for transmitting oscillation to said pressure rollers;an oscillator for oscillating said oscillation-transmitter at a natural frequency of said oscillation-transmitter; anda planarizer including an elastically deformable plate, said planarizer slidably making contact with the floor, and being arranged behind said pressure rollers. 2. The apparatus as set forth in claim 1, further comprising a brush which is arranged in front of said pressure rollers, and slidably makes contact with the floor. 3. The apparatus as set forth in claim 1, wherein at least one of said pressure rollers is water-permeable at an outer surface thereof. 4. The apparatus as set forth in claim 2, wherein at least one of said pressure rollers is water-permeable at an outer surface thereof. 5. The apparatus as set forth in claim 1, wherein a pressure at which said pressure rollers make contact with the floor is in the range of 0.2 kg to 0.4 kg both inclusive per one centimeter in an axial direction of said pressure rollers. 6. The apparatus as set forth in claim 2, wherein a pressure at which said pressure rollers make contact with the floor is said floor to be flattened is set in the range of 0.2 kg to 0.4 kg both inclusive per one centimeter in an axial direction of said pressure rollers. 7. The apparatus as set forth in claim 1, wherein said oscillation-transmitter comprises a horizontally extending first plate having two ends, a second plate vertically extending from one of the ends of said first plate, and a third plate vertically extending from the other end of said first plate, and wherein said second and third plates have the same vertical length as each other, and extend in a direction parallel to the axes of said pressure rollers. 8. The apparatus as set forth in claim 2, wherein said oscillation-transmitter comprises a horizontally extending first plate having two ends, a second plate vertically extending from one of the ends of said first plate, and a third plate vertically extending from the other end of said first plate, and wherein said second and third plates have the same vertical length as each other, and extend in a direction parallel to the axes of said pressure rollers. 9. The apparatus as set forth in claim 1, further comprising a driver for rotating said pressure rollers. 10. The apparatus as set forth in claim 2, further comprising a driver for rotating said pressure rollers. 11. The apparatus as set forth in claim 1, wherein said planarizer is rotatable around a horizontal axis. 12. The apparatus as set forth in claim 11, further comprising: a handle for moving said apparatus; anda control lever which controls a position of said planarizer,wherein said control lever is slidable relative to said handle to rotate said planarizer. 13. The apparatus as set forth in claim 1, further comprising at least one weight for compressing said planarizer onto the floor. 14. The apparatus as set forth in claim 13, further comprising a damper on which said at least one weight is arranged. 15. The apparatus of claim 1, wherein said oscillation-transmitter is formed integral with said holder. 16. The apparatus of claim 1, further comprising: a pillar attached to said planarizer; anda weight disposed on said pillar for pressing said planarizer onto the floor. 17. The apparatus of claim 1, further comprising: a pillar attached to said planarizer;a weight disposed on said pillar for pressing said planarizer onto the floor; anda damper disposed on said pillar.