| CPC E04H 12/342 (2013.01) [E04H 12/348 (2013.01); E04H 12/08 (2013.01); E04H 12/12 (2013.01)] | 13 Claims |

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1. A recyclable cylindrical structure comprising a plurality of prefabricated cylindrical units connected with one on top of the other along axes of the plurality of prefabricated cylindrical units, wherein each prefabricated cylindrical unit of the plurality of prefabricated cylindrical units is provided with:
a ring block coaxially fixed on a top of a corresponding prefabricated cylindrical unit;
a plurality of first connection elements circumferentially fixed on a side wall of the ring block, wherein each first connection element of the plurality of first connection elements is wedge-shaped with tip up, and a bottom of each first connection element is formed as a first plane for jamming;
a ring slot coaxially formed on a bottom of the corresponding prefabricated cylindrical unit;
a plurality of second connection elements circumferentially fixed on an inner side wall of the ring slot, wherein each second connection element of the plurality of second connection elements is wedge-shaped with tip down, a top of each second connection element is formed as a second plane for jamming, and each first connection element and/or each second connection element has an elasticity to radially deform;
two first sealing rings arranged on the top of the corresponding prefabricated cylindrical unit, with the ring block positioned between the two first sealing rings; and
a second sealing ring arranged on a top of the ring block; and
wherein:
the ring block of a first prefabricated cylindrical unit is inserted into the ring slot of a second prefabricated cylindrical unit that is adjacent and on top of the first prefabricated cylindrical unit;
the plurality of first connection elements fixed on the side wall of the ring block of the first prefabricated cylindrical unit correspond to and are jammed with, one-to-one, the plurality of second connection elements fixed on the inner side wall of the ring slot formed in the second prefabricated cylindrical unit;
each first connection element of the plurality of first connection elements fixed on the side wall of the ring block of the first prefabricated cylindrical unit is above a corresponding second connection element of the plurality of second connection elements fixed on the inner side wall of the ring slot of the second prefabricated cylindrical unit;
the first plane for jamming of each first connection element of the first prefabricated cylindrical unit is in contact with the second plane for jamming of the corresponding second connection element of the second prefabricated cylindrical unit, such that the first prefabricated cylindrical unit and the second prefabricated cylindrical unit are kept from moving up and down relative to each other;
a gap between the side wall of the ring block of the first prefabricated cylindrical unit and the inner side wall of the ring slot of the second prefabricated cylindrical unit is grouted by slurries;
the two first sealing rings arranged on the top of the first prefabricated cylindrical unit are in contact with a bottom of the second prefabricated cylindrical unit; and
the second sealing ring arranged on the top of the ring block fixed on the first prefabricated cylindrical unit is in contact with a bottom of the ring slot formed in the second prefabricated cylindrical unit.
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