JP7429355B2 - Pipe with sheath pipe and construction method of pipe with sheath pipe - Google Patents

Description

The present invention relates to a sheathed pipe used for water supply, hot water supply, etc., and a method for constructing the sheathed pipe.

Patent Document 1 discloses a corrugated pipe into which a flexible pipe for supplying water and hot water is inserted. Patent Document 2 discloses a resin pipe in which circumferential lines serving as marks for insertion into a pipe joint are drawn at equal intervals in the extending direction of the axis.

JP 2017-26129 Publication Japanese Patent Application Publication No. 2000-88154

It is an object of the present invention to provide a pipe with a sheath that can effectively utilize cutting marks on the pipe body, and a method for constructing a pipe with a sheath.

To achieve the above object, the pipe with sheath tube according to the invention of claim 1 has a bellows shape in which convex portions and concave portions are alternately arranged in the extending direction of the axis, and is expandable and contractible in the extending direction. Also, a sheath comprising a sheath tube made of a transparent resin material, and a pipe body that is inserted into the sheath tube and has a plurality of insertion marks for insertion into the pipe joint attached at equal intervals in the extending direction. In the pipe with a tube, the sheath tube and the pipe main body are arranged so that one of the insertion marks appears to overlap with the tip of the protrusion or the bottom of the recess in a direction perpendicular to the axis. When the first insertion mark is positioned, another insertion mark adjacent to the first insertion mark is located at the tip of the protrusion or the bottom of the recess, which is different from the protrusion or the recess where the first insertion mark appears to overlap. On the other hand, the sheath tubes were configured so that they appeared to overlap in a direction perpendicular to the axis.

According to a second aspect of the present invention, in the first aspect, the outer diameter of the bottom of the recess is smaller than the inner diameter of the pipe insertion opening of the pipe joint.

A third aspect of the present invention is the method for constructing a pipe with a sheath according to the first aspect, in which the first insertion mark passing through the tip of the convex portion of the sheath tube or the bottom of the recess is used as a guide to install the sheath. The method includes a step of cutting the pipe and the pipe main body, and a step of inserting the pipe main body into the pipe joint using the another insertion mark passing through the sheath pipe as a guide and connecting it to the pipe joint.

According to the present invention, since the sheath tube is transparent, there is no need to expose the insertion mark from the sheath tube when checking the insertion mark on the pipe body.

A side view of a pipe with a sheath. Side view of the pipe body. Side view of the sheath. A vertical cross-sectional view of a pipe joint. FIG. 3 is a vertical cross-sectional view of the pipe joint in which a pipe with a sheath is inserted.

An embodiment embodying the present invention will be described below.
First, the pipe joint to which the pipe with sheath pipe is connected will be explained.

As shown in FIG. 4, a through hole 12a is formed in the joint body 12 that constitutes the pipe joint 11. As shown in FIG. A stepped portion 12b is formed on the inner circumferential surface of the through hole 12a on one end side (left end side in the drawing). A flange portion 13a of the inner cylinder 13 inserted into the through hole 12a from the other end side (right end side in the drawing) is in contact with the stepped portion 12b. A plurality of annular grooves 12c are formed in the inner peripheral surface of the through hole 12a. A seal ring 14 is accommodated in each annular groove 12c.

A stepped portion 12d is formed on the inner peripheral surface of the other end of the through hole 12a. A retaining ring 15 having retaining claws 15a is engaged with the stepped portion 12d. A female threaded portion 12e is formed on the inner peripheral surface of the other end of the through hole 12a. A tightening ring 16 is screwed into the female threaded portion 12e. The outer peripheral edge of the retaining ring 15 is held in a predetermined position by the stepped portion 12d and the tightening ring 16. An insertion space 17 is formed between the outer peripheral surface of the inner cylinder 13 and the inner peripheral surfaces of the joint body 12 and the tightening ring 16.

As shown in FIG. 5, the pipe main body 22 of the pipe with sheath tube 21 is arranged in the insertion space 17 of the pipe joint 11, so that the pipe joint 11 and the pipe main body 22 are connected. When the pipe fitting 11 and the pipe body 22 are connected, the retaining claws 15a of the retaining ring 15 bite into the outer circumferential surface of the pipe body 22, preventing the pipe body 22 from coming off from the pipe fitting 11. .

Note that "L" in the drawing indicates the appropriate insertion depth of the pipe body 22 in the insertion space 17. "M" in the drawing indicates the maximum inner diameter of the opening (pipe insertion port) 16a located on the insertion side of the pipe body 22 (right end side in the drawing) in the tightening ring 16.

Next, the pipe with sheath tube 21 will be explained.
As shown in FIG. 1, the pipe with sheath tube 21 includes a pipe body 22 and a sheath tube 23 into which the pipe body 22 is loosely inserted. The central axes S of the pipe body 22 and the sheath tube 23 are substantially aligned. The sheath pipe 23 protects the pipe body 22 from being stepped on during construction, ensures weather resistance of the pipe body 22, and is used in the sheath pipe construction method to facilitate future replacement of the pipe body 22. I also use it.

As shown in FIG. 2, the pipe main body 22 is made of synthetic resin such as crosslinked polyethylene or polybutene, and is formed into a flexible circular tube shape. A plurality of insertion marks 22a are printed on the outer circumferential surface of the pipe body 22 at equal intervals in the direction in which the axis S extends (in the left-right direction in the drawing). "K" in the drawings indicates the interval (size). The distance K between the insertion marks 22a is the same as the insertion depth L of the pipe body 22 into the pipe joint 11 (see FIG. 5).

As shown in FIG. 3, the sheath tube 23 is made of synthetic resin such as polypropylene, polyethylene, polyamide, etc., and is formed into a flexible circular tube shape. The sheath tube 23 is colorless and transparent or colored and transparent. Examples of colored transparent materials include, for example, blue transparent material intended for use in the water route of water supply piping, red transparent material intended for use in the hot water route, and white transparent material intended for versatility.

The sheath tube 23 has a bellows shape in which annular convex portions 25 and annular concave portions 26 are alternately arranged in the extending direction of the axis S. In other words, the sheath tube 23 can be said to be a corrugated tube that can be expanded and contracted in the direction in which the axis S extends.

The tip 25a of the convex portion 25 is the portion of the sheath tube 23 where the inner and outer diameters are the largest. The bottom 26a of the recess 26 is the portion of the sheath tube 23 where the inner and outer diameters are the smallest. The thickness of the tip 25a of the convex portion 25 is smaller than the thickness of the bottom 26a of the concave portion 26.

The tip 25a of the convex portion 25 extends straight in the direction in which the axis S extends (keeping the diameter the same). The bottom 26a of the recess 26 extends straight in the direction in which the axis S extends. The protrusion 25 and the recess 26 that are adjacent to each other have a tip 25a and a bottom 26a connected to each other via boundary walls 25b and 26b that continuously extend in a direction perpendicular to the axis S.

"N" in the drawings indicates the outer diameter of the bottom 26a of the recess 26. As shown in FIG. 5, the outer diameter N is smaller than the inner diameter M of the pipe insertion port 16a in the tightening ring 16 of the pipe joint 11. Therefore, when the tip of the sheath pipe 23 facing the pipe fitting 11 is provided by the bottom 26a of the recess 26, when the pipe fitting 11 and the pipe main body 22 are connected, the bottom 26a is connected to the pipe of the tightening ring 16. It is possible to install it by positioning it inside the insertion opening 16a.

“P” in FIGS. 1 and 3 indicates the distance between the centers of the tip 25a of the convex portion 25 and the bottom 26a of the concave portion 26 in the extending direction of the axis S in the sheath tube 23. As shown in FIG. 1, the interval K between the insertion marks 22a in the pipe body 22 is an odd multiple of the interval P between the convex portion 25 and the concave portion 26 of the sheath tube 23.

As shown in FIG. 1, the sheath is arranged so that one insertion mark 22a (22a-1) of the pipe body 22 appears to overlap the bottom 26a of the recess 26 in the sheath tube 23 in the direction perpendicular to the axis S. Assume that the pipe 23 and the pipe main body 22 are positioned in the direction in which the axis S extends. In this positioning state, another insertion mark 22a (22a-2) adjacent to one insertion mark 22a (22a-1) appears to overlap the tip 25a of the convex portion 25 in the direction perpendicular to the axis S. .

Although not shown, conversely, the sheath tube 23 and the pipe body 22 are connected so that one insertion mark 22a (22a-1) of the pipe body 22 appears to overlap with the tip 25a of the protrusion 25 in the sheath tube 23. Suppose that we have positioned. In this positioning state, another insertion mark 22a (22a-2) adjacent to one insertion mark 22a (22a-1) appears to overlap the bottom 26a of the recess 26.

Although not shown, as another example of this embodiment, the interval K between the insertion marks 22a may be an even multiple of the interval P between the convex portion 25 and the concave portion 26 in the sheath tube 23. In this case, one insertion mark 22a (22a-1) of the pipe body 22 is inserted into the sheath pipe 23 so that it appears to overlap the bottom 26a of the recess 26 in the sheath pipe 23 in a direction perpendicular to the axis S. Assume that the pipe body 22 is positioned in the extending direction of the axis S. In this positioning state, another insertion mark 22a (22a-2) adjacent to one insertion mark 22a (22a-1) is perpendicular to the axis S with respect to the bottom 26a of a recess 26 other than the recess 26. They appear to overlap in the direction shown.

Conversely, if the sheath tube 23 and the pipe body 22 are positioned so that one insertion mark 22a (22a-1) of the pipe body 22 appears to overlap with the tip 25a of the protrusion 25 in the sheath tube 23. do. In this positioning state, another insertion mark 22a (22a-2) adjacent to one insertion mark 22a (22a-1) appears to overlap with the tip 25a of a projection 25 other than the projection 25. .

Next, an example of the connection work of the sheathed pipe 21 to the pipe joint 11 will be described.

A pipe with sheath tube 21 is connected to the pipe joint 11 shown in FIG. 4 as shown in FIG. 5. In this case, as shown in FIG. 1, one of the insertion marks 22a (22a-1) in the pipe body 22 is perpendicular to the axis S with respect to the bottom 26a of the recess 26 in the sheath pipe 23. The sheath pipe 23 and the pipe main body 22 are positioned in the extending direction of the axis S so that they appear to overlap in the direction. In this state, the sheath tube 23 and the pipe main body 22 are cut at once with a tool using the one insertion mark 22a (22a-1) visible through the bottom 26a of the recess 26 in the sheath tube 23 as a guide.

As shown in FIG. 5, after cutting the sheath pipe 23 and the pipe main body 22, the tip (cut end) of the pipe main body 22 is inserted into the insertion space 27 of the pipe joint 11. Another insertion mark 22a (22a-2), which is adjacent to the first insertion mark 22a (22a-1) by a distance K, moves to the end of the pipe fitting 11, that is, to the pipe insertion opening 16a of the tightening ring 16. If this can be confirmed by passing through the sheath pipe 23, it can be determined that the insertion distance of the pipe body 22 into the pipe joint 11 is approximately equal to the insertion depth L of the pipe joint 11, and the connection state is proper.

The above embodiment has the following effects.
(1) The sheath tube 23 is transparent. Therefore, when cutting the pipe body 22, there is no need to expose one insertion mark 22a (22a-1) from the sheath tube 23. Further, when inserting the pipe body 22 into the pipe joint 11, there is no need to expose another insertion mark 22a (22a-2) from the sheath pipe 23.

(2) For example, if the sheath tube 23 and the pipe body 22 are positioned so that one insertion mark 22a (22a-1) of the pipe body 22 appears to overlap the bottom 26a of the recess 26 in the sheath tube 23. , another insertion mark 22a (22a-2) adjacent to one insertion mark 22a (22a-1) appears to overlap with the tip 25a of the convex portion 25. Therefore, compared to the case where these insertion marks 22a (22a-1, 22a-2) appear to overlap with the thick boundary walls 25b, 26b in the radial direction, the insertion marks 22a (22a-1, 22a-2) The visibility of 2) is improved.

Therefore, the sheath tube 23 and the pipe main body 22 can be accurately cut using the one insertion mark 22a (22a-1) as a guide. In addition, when confirming another insertion mark 22a (22a-2) after the cutting, in order to clearly confirm the other insertion mark 22a (22a-2), the tip 25a of the convex portion 25 or the bottom 26a of the concave portion 26 is attached. There is no need for repositioning, and there is a smooth transition from the cutting process to the insertion process.

In FIG. 1, for the insertion mark 22a (22a-3) far away from the first insertion mark 22a (22a-1), the insertion mark 22a (22a-3) is located not at the tip 25a of the protrusion 25 or the bottom 26a of the recess 26, but at the radial direction. It appears to overlap the thick boundary walls 25b and 26b, resulting in poor visibility. However, the insertion mark 22a (22a-3) has low utility value in the current construction, and no problem arises even if its visibility is poor.

In this sense, "the interval K between the insertion marks 22a is an odd or even multiple of the interval P between the protrusion 25 and the recess 26" means that it is exactly an odd or even multiple, and all the insertion marks 22a It is not limited to the case where the image appears to overlap the tip 25a of the protrusion 25 or the bottom 26a of the recess 26. Even one insertion mark 22a (22a-1) used in the cutting process and another insertion mark 22a (22a-2) used in the insertion process overlap with the tip 25a of the protrusion 25 or the bottom 26a of the recess 26. As long as you can see it.

(3) When the pipe fitting 11 and the pipe main body 22 are connected, the bottom 26a of the recess 26 in the sheath pipe 23 can be located within the pipe insertion port 16a of the pipe fitting 11. Therefore, the pipe main body 22 is less likely to be exposed from the sheath pipe 23 and the pipe joint 11, the appearance of the construction site is improved, and the pipe main body 22 is less susceptible to the effects of ultraviolet rays and the like, thereby extending the life of the pipe main body 22.

In this way, when the bottom 26a of the recess 26 in the sheath pipe 23 is located within the pipe insertion port 16a of the pipe joint 11, when the sheath pipe 23 is pulled out from the pipe insertion port 16a, compared to the case where it is not located conversely, Moreover, the sheath pipe 23 becomes easily caught on the pipe joint 11 (tightening ring 16). In this sense, the fact that the sheath tube 23 is transparent makes it possible to remove the sheath tube 23 from the pipe insertion opening 16a without having to pull it out from the pipe insertion opening 16a during later inspections such as confirmation of construction. It can be said that this is particularly effective since the positional relationship with 16a can be confirmed transparently.

(4) In the sheath tube 23, the tip 25a of the convex portion 25 has a small wall thickness. Therefore, even though the tip 25a is located radially away from the pipe main body 22, the insertion mark 22a, which appears to overlap the tip 25a, has good visibility. Furthermore, the bottom 26a of the recess 26 in the sheath tube 23 has a large wall thickness, which contributes to improving the durability of the sheath tube 23. Since the bottom 26a is located close to the pipe body 22 in the radial direction, the insertion mark 22a, which appears to overlap the bottom 26a, has good visibility even if the bottom 26a has a large wall thickness. In order to achieve both of these requirements at a high level, it is preferable that the thickness of the bottom 26a of the concave portion 26 is approximately 1.2 to 2 times the thickness of the tip 25a of the convex portion 25.

(Another example)
The above embodiment can be modified as follows, for example.
- The tip 25a of the convex portion 25 is extended in a curved manner (so that the diameter changes) in the extending direction of the axis S.

- The bottom 26a of the recess 26 is curved and extended in the direction in which the axis S extends.

- The outer diameter of the tip 25a of the convex portion 25 of the sheath pipe 23 is smaller than the inner diameter M of the pipe insertion port 16a of the pipe joint 11. In this way, even if the tip of the sheath pipe 23 facing the pipe fitting 11 is provided by the tip 25a of the convex portion 25, when the pipe fitting 11 and the pipe main body 22 are connected, The tip 25a can be positioned within the pipe insertion opening 16a of the clamping ring 16.

DESCRIPTION OF SYMBOLS 11... Pipe joint, 16a... Pipe insertion port, 21... Pipe with sheath pipe, 22... Pipe main body, 22a... Insertion mark, 22a-1... One insertion mark, 22a-2... Another insertion mark, 23... Sheath pipe , 25... Convex portion, 25a... Tip, 26... Concave portion, 26a... Bottom.

Claims (5)

A sheath tube formed of a transparent resin material, which has a bellows shape in which convex portions and concave portions are alternately arranged in the direction of extension of the axis, and is extendable and retractable in the direction of extension, and is inserted into the sheath tube. and a pipe body with a pipe body on which a plurality of insertion marks for insertion into the pipe joint are attached at equal intervals in the extending direction, wherein the pipe joint is exposed from the sheath pipe. A retaining ring is provided that bites into the outer circumferential surface of the pipe body to prevent the pipe body from coming off from the pipe joint, and one of the insertion marks is located at the tip of the convex portion or at the tip of the convex portion. When the sheath pipe and the pipe body are positioned so that they appear to overlap with each other in the direction orthogonal to the axis with respect to the bottom of the recess, another insertion mark adjacent to the first insertion mark is the first insertion mark. A pipe with a sheath tube configured such that the sheath tube appears to overlap in a direction perpendicular to the axis with respect to the tip of the convex portion different from the convex portion or the bottom of the concave portion that is different from the convex portion or the concave portion. . The pipe with a sheath according to claim 1, wherein in the sheath, the tip of the convex portion and the bottom of the recess are connected via a boundary wall extending in a direction perpendicular to the axis. The pipe with a sheath tube according to claim 1, wherein a wall thickness at a tip of the convex portion of the sheath tube is smaller than a wall thickness at a bottom of the concave portion. The pipe with a sheath tube according to claim 1, wherein an outer diameter of the bottom of the recess in the sheath tube is smaller than an inner diameter of a pipe insertion opening of the pipe joint. 2. The method for constructing a pipe with a sheath tube according to claim 1, wherein the sheath tube and the pipe body are installed using the first insertion mark passing through the tip of the convex portion of the sheath tube or the bottom of the recessed portion as a guide. A method for constructing a pipe with a sheathed pipe, comprising: a cutting step; and a step of inserting the pipe body into the pipe joint using the other insertion mark passing through the sheath pipe as a guide and connecting it to the pipe joint.

Images