JPH1194182A - Piping work execution method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate work of inserting a fluid pipe through a shield tube by forming the tip of the fluid pipe in such shape as to have a plurality of inclined faces in the case of executing double piping for inserting a flexible fluid pipe for making liquid such as hot water or water pass through, through a flexible shield tube for piping. SOLUTION: In a piping for connecting a fluid pipe 2 taken out of a header of a water supply source, to each indoor feed water instrument, the fluid pipe 2 is to be a pipe made of flexible resin such as polybutene or cross-linked polyethylene, and piped in a flexible shield tube 1 made of a resin. The shield tube 1 is fixed in a suitable place under a floor or in a wall, and a muffling tube 5 is mounted in a space formed between the fluid pipe 2 and the inner surface of the shield tube 1. In this case, the tip of the fluid tube 2 to be inserted in the shield tube 1 is formed to have a plurality of inclined faces 2a. Even at, a shield tube part bent at 90 deg., the fluid pipe 2 can therefore be smoothly inserted without being caught by the rugged inner surface of the shield tube 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double pipe in which a flexible fluid pipe is inserted into a sheath pipe by using a sheath pipe for water supply and hot water supply pipes in a building, and the fluid pipe moves smoothly without being caught. The pipe construction method that can be inserted into the sheath pipe, and a pipe for preventing the fluid pipe from vibrating or colliding with the sheath pipe to generate an impact sound due to a water hammer phenomenon caused by sudden opening and closing of the faucet or the like. The present invention relates to a piping construction method in which a rod can be smoothly moved and inserted without being caught in a sheath tube.

[0002]

2. Description of the Related Art For example, Japanese Utility Model Laid-Open Publication No. Sho 62-77384 discloses a retractable device for inserting a flexible tube into a sheath tube, which relates to a flexible tube for supplying gaseous fuel. In Japanese Patent Application Laid-Open No. Hei 6-34090 filed by the present applicant in the past, as a structure for silencing vibration noise caused by a water hammer, a tube or rod is interposed in the space between the sheath tube and the fluid tube to form a sheath tube and a fluid tube. A device that silences a collision sound with is disclosed. FIG. 4 shows a conventional longitudinal sectional view when the fluid pipe 2 is inserted into the sheath pipe 1. Fluid pipe 2
The tape 6 is wound and fixed together with the noise reduction pipe or rod 3 near the distal end of the fluid pipe 2 along the noise reduction pipe or rod 3 over the entire length of the fluid pipe 2.

[0003]

By the way, in the above-mentioned prior art configuration, when the fluid pipe is inserted into the sheath pipe, the corner of the tip of the fluid pipe cut at a right angle tries to pass through the bent part of the sheath pipe. There is a problem that the sheath tube is caught on the uneven inner surface and cannot be pushed deep from that position. In addition, even when the sheath is cut obliquely, that is, when there is only one inclined surface, there is a problem that the tip of the fluid pipe collides with the second bent portion of the sheath pipe. Even if the fluid pipe can be pushed in, the work of pulling out the fluid pipe a little and then pushing it in again and inserting it must be repeated many times, which takes time and causes the pipe construction work efficiency to deteriorate .

[0004] Further, when a noise-suppressing pipe or rod is inserted into a sheath pipe together with a fluid pipe, it is more difficult to perform piping work than when only a fluid pipe is used. As a result, the tip of the tube or rod is caught on the uneven inner surface of the sheath tube. As a result, the pipe or rod for noise reduction can not be inserted at all, or the pipe or rod for noise reduction can be inserted only halfway through the sheath tube, and when the water hammer phenomenon occurs, the fluid pipe vibrates. In some cases, the fluid pipe and the sheath pipe may collide with each other at a place where the noise reduction pipe or rod is not inserted, and may generate noise.

The present invention has been made to solve the above-mentioned problems and to provide a piping construction method capable of easily performing piping work and reliably preventing vibration and noise of a fluid pipe.

[0006]

SUMMARY OF THE INVENTION The gist of the present invention is to provide a piping method for a double pipe in which a flexible fluid pipe through which a liquid such as hot water or water passes is inserted into a flexible sheath pipe. And
A pipe construction method characterized in that the fluid pipe is inserted into the sheath pipe in a shape having a plurality of inclined surfaces at a tip thereof. Further, in the space between the fluid pipe and the sheath pipe, a flexible pipe or rod is interposed, and the tip of the pipe or rod is folded back and inserted and fixed inside the fluid pipe, and together with the fluid pipe, A piping construction method of inserting the sheath tube into the sheath tube may be used.

[0007]

According to the present invention having the above construction, even if the fluid pipe having the inclined surface comes into contact with the inner surface of the sheath pipe having two or more bent portions, the fluid pipe does not slip and catch, and has a curl. Can be easily inserted into the sheath tube.
In addition, since the tip of the flexible resin pipe or resin rod is folded back at the same time as inserting the fluid pipe into the sheath pipe, this also does not get caught on the inner surface of the sheath pipe and is inserted into the sheath pipe together with the fluid pipe. It can be easily inserted. In addition, the flexible pipe or rod meanders between the inner surface of the sheath tube and the outer surface of the fluid tube and abuts at several places, so the movement of the fluid tube in the sheath tube is suppressed, there is no play, and the fluid tube vibrates. Is prevented. For this reason, an impact sound and an abnormal sound at the time of the water hammer phenomenon are prevented.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall view of a pipe showing an embodiment of the present invention. The pipe is directly connected from a header 4 of a water supply source fixed outdoors to each water supply device 3 in the room through a fluid pipe 2. FIG. 2 is a sectional view taken along line AA of FIG. The fluid pipe 2 is a flexible resin pipe such as polybutene or cross-linked polyethylene, and is piped into the resin-made flexible sheath pipe 1. The sheath tube 1 is fixed so as not to move at an appropriate place under the floor or in the wall, and the sound deadening tube 5 is mounted in a space formed between the inner surface of the sheath tube 1 and the fluid tube 2. .

FIG. 3 shows a longitudinal sectional view of the present embodiment when the fluid pipe 2 is inserted into the sheath pipe 1. The fluid pipe 2 to be inserted is cut diagonally at a plurality of positions so that the tip of the
The shape has a plurality of inclined surfaces. In the present embodiment, the fluid pipe 2 is cut obliquely from two directions to form two inclined surfaces. Thus, when the fluid pipe 2 is inserted into the sheath pipe 1, even if the sheath pipe 1 has four or more bent parts at 90 degrees in the horizontal part and two rising parts, Since the cross-sectional angle of the corner 2a of the fluid pipe 2 which is in contact with the uneven inner surface of the sheath tube 1 is obtuse, the inclined surface of the fluid pipe 2 slides on the uneven inner surface of the sheath tube 1 without being caught. The fluid pipe 2 can be pushed into the inside 1 and inserted therethrough. In addition, if the two vertices at the tip of the fluid pipe are bent toward the center of the pipe, the insertion work becomes easier.

In order to insert the silencing tube 5 into the sheath tube 2 at the same time as the fluid tube 2, the end of the silencing tube 5 is folded back and inserted into the fluid tube 2. A portion slightly away from the tip is wound and fixed with tape 6. As a result, a folded portion 5a having a small radius of curvature is formed at the end of the sound deadening tube 5. Therefore, when the fluid pipe 2 equipped with the silencing tube 5 is simultaneously inserted into the sheath tube 1, even if the folded portion 5 a of the silencing tube 5 comes into contact with the uneven inner surface of the sheath tube 1, Since it has a radius of curvature, it slides well and the silencing tube 5 does not get caught. The sound deadening tube 5 is a soft resin tube made of a material such as polyethylene, polytetrafluoroethylene, polyamide, and nylon. In this embodiment, the inner diameter of the sheath tube 1 is φ22.
Inside, a polybutene tube having an outer diameter of φ13 and an outer diameter of φ4 of a polyamide tube 5 for noise reduction are mounted in the space between the sheath tube 1 and the polybutene tube 2 as shown in FIG. The silencing tube 5 may be a tubular one whose section is elastically deformed, or a rod-shaped one whose inside is filled with sponge or rubber and whose outer surface is coated with a resin having a low dynamic friction coefficient (not shown).

The noise was measured by actually causing the water hammer phenomenon with and without the sound deadening tube 5. A synthetic resin sheath tube 1 having an inner diameter of φ22 and having a polybutene tube nominal 10A of a fluid tube 2 through which water passes through a pipe of about 6 m in length and length and measuring at a position of a floor height of 1 m was measured. When the muffling tube is not put in the sheath tube at the level of 42.3 dB (A scale), the maximum noise level when the kitchen lever faucet is quickly opened and closed is 71.2.
dB (A). Furthermore, the outer diameter φ4 of the silencing polyamide tube was inserted into a single sheath tube, and a water hammer was generated under the same conditions and measured. As a result, the maximum noise level was reduced to 48.8. This noise level was almost the same level as the background noise, and the noise due to the water hammer phenomenon could not be heard at all.

[0012]

As described above, the present invention is a piping construction method in which piping work is easy, reliable, and workability is good in a double piping which reliably prevents vibration of a fluid pipe and a collision sound with a sheath pipe.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an overall view of an embodiment of the present invention.

FIG. 2 is a view showing a cross section of a pipe section AA in FIG. 1;

FIG. 3 is a longitudinal sectional view of the present embodiment when a fluid tube is inserted into a sheath tube.

FIG. 4 shows a conventional longitudinal sectional view when a fluid tube is inserted into a sheath tube.

[Explanation of symbols]

 1: sheath tube 2: fluid tube 2a: corner portion 3: lever faucet 4: header 5: sound deadening tube 5a: folded portion 6: tape

Claims (2)

[Claims] 1. A double-pipe piping construction method in which a flexible fluid pipe through which a liquid such as hot water or water passes is inserted into a flexible sheath pipe, and the pipe is piped. A piping construction method, wherein the pipe is inserted into the sheath tube as a shape having a plurality of inclined surfaces. 2. A flexible pipe or rod is interposed in the space between the fluid pipe and the sheath pipe, and the tip of the pipe or rod is folded back and inserted and fixed inside the fluid pipe. The piping method according to claim 1, wherein the pipe is inserted into the sheath tube together with the fluid tube.