Synthetic resin corrugated pipe having a concave-convex surface

Claim 2

A synthetic resin corrugated pipe comprising: a corrugated pipe wall having one of an annular shape or a helical shape, said corrugated pipe wall having a plurality of a tubular convex portions having a quadrangular cross-sectional shape and a plurality of tubular concave portions having a circular cross-sectional shape, wherein said tubular convex portions are larger than said tubular concave portions.

Claim 3

A synthetic resin corrugated pipe comprising: a corrugated pipe wall having one of an annular shape or helical shape, said corrugated pipe wall having a plurality of tubular convex portions having a quadrangular cross-sectional shape and a plurality of tubular concave portions having a circular cross-sectional shape, wherein said tubular convex portions are larger than said tubular concave portions, wherein each of said convex portions has a square cross-section shape with arc-shaped corners.

Claim 4

A synthetic resin corrugated pipe comprising: a corrugated pipe wall having one of an annular shape or helical shape, said corrugated pipe wall having a plurality of tubular convex portions having a quadrangular cross-sectional shape and a plurality of tubular concave portions having a circular cross-sectional shape, wherein said tubular convex portions are larger than said tubular concave portions, wherein each of said convex portions has a square cross-section shape with arc-shaped corners.

Claim 5

A synthetic resin corrugated pipe according to claim 1, wherein said convex portions include a plurality of projections and a plurality of cavities for receiving said projections, formed on outer circumferential surfaces of said convex portions.

Claim 6

A synthetic resin corrugated pipe, comprising: a corrugated pipe wall having one of an annular shape or helical shape, said corrugated pipe wall having a plurality of tubular convex portions having a quadrangular cross-sectional shape and a plurality of tubular concave portions having a circular cross-sectional shape, wherein said tubular convex portions are larger than said tubular concave portions, wherein a first end of said pipe includes a quadrangular fitting portion having an internal dimension substantially similar to that of an external dimension of said convex portions.

Claim 7

A synthetic resin corrugated pipe, comprising: a corrugated pipe wall having one of an annular shape or helical shape, said corrugated pipe wall having a plurality of tubular convex portions having a quadrangular cross-sectional shape and a plurality of tubular concave portions having a circular cross-sectional shape, wherein said tubular convex portions are larger than said tubular concave portions, wherein a first end of said pipe includes a quadrangular fitting portion having an internal dimension substantially similar to that of an external dimension of said convex portions.

Claim 8

A synthetic resin corrugated pipe according to claim 4, wherein a second end of said pipe includes a male connection portion, said male connection portion including a male concave portion having a different external dimension than that of others of said convex portions.

Claim 9

A synthetic resin corrugated pipe according to claim 1, wherein a first end of said pipe includes a fitting portion having a cylindrical cross-sectional shape.

Claim 10

A synthetic resin corrugated pipe according to claim 6, wherein a second end of said pipe includes a male connection portion having a cylindrical cross-sectional shape, said male connection portion for being positioned in said fitting portion.

Claim 11

A synthetic resin corrugated pipe comprising: a corrugated pipe wall having one of an annular shape or helical shape, said corrugated pipe wall having a plurality of tubular convex portions having a quadrangular cross-sectional shape and a plurality of tubular concave portions having a circular cross-sectional shape, wherein said tubular convex portions are larger than said tubular concave portions, wherein a diameter of an outer surface of a cylindrical fitting portion is substantially equal to a length of a side of said quadrangular convex portion.

Claim 12

A synthetic resin corrugated pipe comprising: a corrugated pipe wall having one of an annular shape or helical shape, said corrugated pipe wall having a plurality of tubular convex portions having a quadrangular cross-sectional shape and a plurality of tubular concave portions having a circular cross-sectional shape, wherein said tubular convex portions are larger than said tubular concave portions, wherein a diameter of an outer surface of a cylindrical fitting portion is substantially equal to a length of a side of said quadrangular convex portion.

Claim 13

A synthetic resin corrugated pipe according to claim 7, wherein an inner surface of said male connection portion has a cylindrical cross-sectional shape and a diameter similar to a diameter of an inner surface of one of said concave portions.

Claim 14

A pipeline, comprising: at least one pipe, said at least one pipe including a pipe wall, wherein said pipe wall comprises a quadrangular outer surface and a recessed circular surface, said pipe wall being formed of synthetic resin, and wherein said quadrangular outer surface comprises quadrangular portions and said recessed circular surface comprises circular portions, said quadrangular portions and said circular portions alternating along a length of said at least one pipe.

Claim 15

A pipeline, comprising: at least one pipe, said at least one pipe including a pipe wall, wherein said pipe wall comprises a quadrangular outer surface and a recessed circular surface, said pipe wall being formed of synthetic resin, and wherein said quadrangular outer surface comprises quadrangular portions and said recessed circular surface comprises circular portions, said quadrangular portions and said circular portions alternating along a length of said at least one pipe.

Claim 16

A pipeline comprising: at least one pipe, said at least one pipe including a pipe wall, wherein said pipe wall comprises a quadrangular outer surface and a recessed circular surface, said pipe wall being formed of synthetic resin, wherein said quadrangular outer surface comprises quadrangular portions and said recessed circular surface comprises circular portions, said quadrangular portions and said circular portions alternating along a length of said at least one pipe, wherein said at least one pipe includes first and second pipes, said pipeline further comprising a joint for joining said first and second pipes, said joint including a plurality of joining packings, a sealing packing forming a seal between said sections of said first and second pipes and a joint cover, said joining packings having an outer surface having a first size and shape and an inner surface having a second size and shape, and said circular portions including an exterior having said second size and shape.

Claim 17

A pipeline comprising: at least one pipe, said at least one pipe including a pipe wall, wherein said pipe wall comprises a quadrangular outer surface and a recessed circular surface, said pipe wall being formed of synthetic resin, wherein said quadrangular outer surface comprises quadrangular portions and said recessed circular surface comprises circular portions, said quadrangular portions and said circular portions alternating along a length of said at least one pipe, wherein said at least one pipe includes first and second pipes, said pipeline further comprising a joint for joining said first and second pipes, said joint including a plurality of joining packings, a sealing packing forming a seal between said sections of said first and second pipes and a joint cover, said joining packings having an outer surface having a first size and shape and an inner surface having a second size and shape, and said circular portions including an exterior having said second size and shape.

Claim 18

A pipeline as in claim 11, wherein said quadrangular portions have an exterior having a third size and shape larger than said first size and shape, and said joint cover includes ridges for accommodating said packings.

Claim 19

A pipeline comprising: at least one pipe, said at least one pipe including a pipe wall, wherein said pipe wall comprises a quadrangular outer surface and a recessed circular surface, said pipe wall being formed of synthetic resin, wherein said quadrangular outer surface comprises quadrangular portions and said recessed circular surface comprises circular portions, said quadrangular portions and said circular portions alternating along a length of said at least one pipe, wherein said at least one pipe includes first and second pipes, said pipeline further comprising a joint for joining said first and second pipes, said joint including a plurality of joining packings, a plurality of sealing packings forming a seal between said sections of said first and second pipes, a plurality of pins and a joint cover, said joining packings having a channel cross-sectional shape, and being positioned between said joint cover and said quadrangular portions, said joint cover having a groove and pin holes, said sealing packings being positioned between said sections of said pipe and said groove, and said pins being positioned in said pin holes for fixedly securing said joint cover.

Claim 20

A pipeline comprising: at least one pipe, said at least one pipe including a pipe wall, wherein said pipe wall comprises a quadrangular outer surface and a recessed circular surface, said pipe wall being formed of synthetic resin, wherein said quadrangular outer surface comprises quadrangular portions and said recessed circular surface comprises circular portions, said quadrangular portions and said circular portions alternating along a length of said at least one pipe, wherein said at least one pipe includes first and second pipes, said pipeline further comprising a joint for joining said first and second pipes, said joint including a plurality of joining packings, a plurality of sealing packings forming a seal between said sections of said first and second pipes, a plurality of pins and a joint cover, said joining packings having a channel cross-sectional shape, and being positioned between said joint cover and said quadrangular portions, said joint cover having a groove and pin holes, said sealing packings being positioned between said sections of said pipe and said groove, and said pins being positioned in said pin holes for fixedly securing said joint cover.

Claim 21

A pipeline comprising: at least one pipe, said at least one pipe including a pipe wall, wherein said pipe wall comprises a quadrangular outer surface and a recessed circular surface, said pipe wall being formed of synthetic resin, wherein said quadrangular outer surface comprises quadrangular portions and said recessed circular surface comprises circular portions, said quadrangular portions and said circular portions alternating along a length of said at least one pipe, wherein said at least one pipe includes a first end having a fitting portion, said fitting portion having a groove.

Claim 22

A pipeline comprising: at least one pipe, said at least one pipe including a pipe wall, wherein said pipe wall comprises a quadrangular outer surface and a recessed circular surface, said pipe wall being formed of synthetic resin, wherein said quadrangular outer surface comprises quadrangular portions and said recessed circular surface comprises circular portions, said quadrangular portions and said circular portions alternating along a length of said at least one pipe, wherein said at least one pipe includes a first end having a fitting portion, said fitting portion having a groove.

Claim 23

A pipeline as in claim 14, wherein said fitting portion includes an inner surface, said inner surface having substantially a same size and shape as an outer surface of said quadrangular portions.

Claim 24

A pipeline as in claim 10, wherein said at least one pipe includes a first end and a second end opposite said first end, said first end including a fitting portion and said second end including an inserting portion, said fitting portion including an inner surface having substantially a same size and shape as that of an outer surface of said inserting portion.

Claim 25

A pipeline comprising: at least one pipe, said at least one pipe including a pipe wall, wherein said pipe wall comprises a quadrangular outer surface and a recessed circular surface, said pipe wall being formed of synthetic resin, wherein said quadrangular outer surface comprises quadrangular portions and said recessed circular surface comprises circular portions, said quadrangular portions and said circular portions alternating along a length of said at least one pipe, wherein said circular portions have an exterior groove.

Claim 26

A pipeline comprising: at least one pipe, said at least one pipe including a pipe wall, wherein said pipe wall comprises a quadrangular outer surface and a recessed circular surface, said pipe wall being formed of synthetic resin, wherein said quadrangular outer surface comprises quadrangular portions and said recessed circular surface comprises circular portions, said quadrangular portions and said circular portions alternating along a length of said at least one pipe, wherein said circular portions have an exterior groove.

Claim 27

A pipeline as in claim 10, wherein said quadrangular portions have an exterior surface including at least one projection and at least one cavity.

Claim 28

A multi-pipe system, comprising: a plurality of synthetic resin pipes each having a quadrangular outer surface and a circular inner surface forming a pipe bundle, wherein said quadrangular outer surface comprises quadrangular portions and said circular inner surface comprises circular portions, said quadrangular portions and said circular portions alternating along a length of each of said pipes; and a joint for joining a first pipe bundle with a second pipe bundle.

Claim 29

A multi-pipe system, comprising: a plurality of synthetic resin pipes each having a quadrangular outer surface and a circular inner surface forming a pipe bundle, wherein said quadrangular outer surface comprises quadrangular portions and said circular inner surface comprises circular portions, said quadrangular portions and said circular portions alternating along a length of each of said pipes; and a joint for joining a first pipe bundle with a second pipe bundle.

Claim 30

A synthetic resin corrugated pipe as in claim 1, wherein said tubular convex portions have a quadrangular hollow portion.

Claim 31

A pipeline as in claim 10, wherein said quadrangular portions have a quadrangular hollow portion.

Claim 32

A synthetic resin corrugated pipe as in claim 1, wherein the width of each of said convex portions in the lengthwise direction of the pipe is longer than that of each of said concave portions.

Claim 33

A pipeline as in claim 10, wherein the width of each of said quadrangular portions in the lengthwise direction of the pipe is longer than that of each of said circular portions.

Claim 34

A synthetic resin corrugated pipe as in claim 1 wherein each of said convex portions has a hollow portion larger in size than a hollow portion of said concave portions.

Claim 35

A pipeline as in claim 10, wherein each of said quadrangular portions has a hollow portion larger in size than a hollow portion of said circular portions.