Rehabilitation pipe and pipe rehabilitation method
AssigneeShonan Gosei-Jushi Seisakusho K.K.
InventorsTakao Kamiyama, Koji Kaneta, Kenji Fujii, Makoto Ishida
Life of this patent
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Abstract
A pipe unit for a rehabilitation pipe is used to rehabilitate an existing pipe. The pipe unit has segments mutually linked in a circumferential direction of the pipe unit, and at least one diameter expander for enlarging an inner diameter of the pipe unit. The diameter expander has a thickness in the circumferential direction of the pipe unit and is inserted between an adjacent pair of the mutually linked segments so as to be completely separated from each other by the diameter expander in the circumferential direction and by an amount corresponding to the thickness of the diameter expander.
Claims14
A rehabilitation pipe for rehabilitating an existing pipe, the rehabilitation pipe comprising:
- a plurality of segments each comprising an inner surface plate, and side plates and end plates provided upright on a peripheral edge of the inner surface plate, the inner surface plate, the side plates and the end plates being formed integrally from a plastic material, and the segments being linked in a circumferential direction to assemble a closed ring-shaped pipe unit and being linked in a pipe-length direction to form the rehabilitation pipe for rehabilitating the existing pipe;
- and
- a diameter expander inserted between an adjacent pair of the linked segments for enlarging an inner diameter of the pipe unit, the diameter expander having a thickness extending in the circumferential direction of the linked segments so as to enlarge the inner diameter of the pipe unit by an amount corresponding to the thickness of the diameter expander,
- wherein the end plate of each segment of the adjacent pair of linked segments is provided with a concave section and a convex section, and the diameter expander is provided with a convex section and a concave section configured to fit into the concave section and the convex section, respectively, of the end plate.
A method for rehabilitating an existing pipe, comprising:
- preparing a plurality of segments each comprising an inner surface plate, and side plates and end plates provided upright on a peripheral edge of the inner surface plate, the inner surface plate, the side plates and the end plates being formed integrally from a plastic material;
- linking the plurality of segments to form a plurality of closed ring-shaped pipe units, each of the pipe units being formed by linking the segments in a circumferential direction together with a diameter expander inserted between the end plates of an adjacent pair of the linked segments to assemble the pipe unit, the end plates of the adjacent pair of linked segments being separated from each other by an amount corresponding to a thickness of the diameter expander that extends in the circumferential direction of the linked segments so as to enlarge an inner diameter of the pipe unit by the amount corresponding to the thickness of the diameter expander, wherein each of the end plates of the adjacent pair of linked segments is provided with a concave section and a convex section, and the diameter expander is provided with a convex section and a concave section configured to fit into the concave section and the convex section, respectively, of the end plate;
- and
- sequentially linking the pipe units in a pipe-length direction of the existing pipe to form a segmental rehabilitation pipe inside the existing pipe for rehabilitating the existing pipe.
Dependencies are inferred from the claim text.