JP4532510B2 - Inner pipe steadying structure of double pipe, fixing method and construction method thereof - Google Patents

Description

  The present invention relates to a double pipe inner pipe steadying structure for preventing noise caused by water hammer (water hammer), a fixing method thereof, and a construction method thereof.

  In recent years, when pipes for water supply or hot water supply are laid in a building, the sheath pipe header method is widely used. In this construction method, a double pipe in which a resin inner pipe for water supply or hot water supply is inserted into a sheath pipe made of a corrugated pipe made of resin is used. When such a double pipe is laid in a building and used for water supply or hot water supply, the inner pipe may sway in the sheath due to water hammer (rapid increase in water pressure) that occurs when the faucet is suddenly closed. There is a problem that the sheath collides with the inner surface of the pipe and generates noise. In order to solve this problem, it is effective to interpose a buffer material between the sheath tube and the inner tube so that the inner tube does not collide with the sheath inner surface (Patent Documents 1 and 2).

Japanese Patent No. 2934722 JP 2005-147171 A

  However, interposing a cushioning material between the sheath tube and the inner tube not only increases the cost by the amount of the cushioning material, but it is also troublesome to draw the cushioning material into the sheath tube. In addition, if a cushioning material is interposed between the sheath tube and the inner tube, there is no clearance between the sheath tube and the inner tube, so that insertion becomes difficult when the inner tube is inserted into the sheath tube. Furthermore, when the inner pipe is pulled out and renewed, the buffer material is broken and clogged, and the inner pipe cannot be pulled out.

  In view of the above problems, an object of the present invention is a double pipe inner pipe steadying structure capable of suppressing the fluctuation of the inner pipe when water hammer occurs without using a buffer material, and a fixing method and construction thereof. It is to provide a method.

  The inner pipe steadying structure of the double pipe according to the present invention is a double pipe in which an inner pipe for water supply or hot water supply is inserted into the sheath pipe, and the sheath pipe can be expanded and contracted in the axial direction. Using a corrugated tube whose inner diameter is larger than the outer diameter of the inner tube and whose inner diameter is smaller than the expanded state in the contracted state, a contracted portion in which the sheath tube is contracted in the axial direction is provided in at least one position of the expanded sheath In this contraction portion, the shake of the inner tube is suppressed.

  In the inner pipe steadying structure of the double pipe according to the present invention, it is preferable that the inner peripheral surface of the contracted portion of the sheath pipe is brought into contact with the inner pipe.

  In the inner pipe steadying structure of the double pipe according to the present invention, it is preferable to fix both ends or the entire length of the contracted portion of the sheath tube with a fixing member so that the contracted portion does not extend. As the fixing member, for example, a half fixing member made of metal or synthetic resin can be used, but a saddle for fixing to a structure such as a wall or floor of a building can also be used.

  The double pipe fixing method according to the present invention is a double pipe having an inner pipe steady structure constructed as described above, which is a contracted portion of the sheath pipe and is applied to a structure such as a building wall or floor. It is characterized by being fixed.

  Moreover, the construction method of the piping for water supply or hot water supply which concerns on this invention is characterized by constructing piping for water supply or hot water supply using said fixing method.

  According to the present invention, by shrinking a part of the sheath tube, the inner diameter of the sheath tube is reduced and the inner tube is prevented from being shaken. Can be suppressed. Therefore, the cost can be reduced as much as the cushioning material is not required, and the inner tube can be inserted and the inner tube can be easily pulled out when the inner tube is renewed.

  Further, if the inner peripheral surface of the contracted portion of the sheath is brought into contact with the inner tube, the shake of the inner tube can be more reliably suppressed, and the noise prevention effect becomes more reliable.

  Further, if both ends or the entire length of the contracted portion of the sheath tube are fixed with a fixing member, the contracted portion can be prevented from extending (inner diameter is increased), so that the noise preventing effect can be maintained over a long period of time.

  Further, according to the fixing method of the present invention, it is possible to fix the contracted portion of the sheath and the contracted portion of the sheath and the like to the wall or floor of the building.

  In addition, according to the construction method of the present invention, the inner pipe in the sheath pipe is steady without fixing any special member, and is fixed to the structure such as the wall or floor of the building. Since heavy piping can be constructed, simple and efficient construction of water supply or hot water supply piping can be performed.

  1 and 2 show an embodiment of the present invention. FIG. 1 shows an example in which the double pipe 11 is laid toward the sink 13. 15 is a faucet, 17 is a main plug, 19 is a floor of a building, 21 is a slab below the floor, and 23 is a wall.

  As shown in FIG. 2, the double pipe 11 is obtained by inserting an inner pipe 27 for supplying water or hot water into a sheath pipe 25. The sheath tube 25 is extendable in the axial direction, and is configured as a bellows-like corrugated tube whose inner diameter is larger than the outer diameter of the inner tube 27 in the expanded state and smaller in inner diameter than the expanded state in the contracted state. . The inner pipe 27 is the same straight pipe as the conventional one. The sheath tube 25 is made of, for example, polyethylene, and the inner tube 27 is made of, for example, cross-linked polyethylene. The sheath tube 25 is laid out in a stretched state. If a contracted portion 25a in which the sheath tube is contracted in the axial direction is provided in a part of the sheath tube 25, the inner diameter of the contracted portion 25a is reduced. The movement in the direction is limited, and the shake of the inner tube 27 can be suppressed.

  For example, when the outer diameter of the inner tube 27 is 17 mm, the inner diameter of the sheath 25 in the stretched state is 18 mm. The sheath tube 25 is formed so that the inner diameter can be reduced to 16 mm when it is contracted in the axial direction without inserting the inner tube. Therefore, when the inner tube 27 is inserted into the sheath tube 25 and a part of the sheath tube 25 is contracted, the inner peripheral surface of the contracted portion 25 a comes into contact with the outer peripheral surface of the inner tube 27. The inner peripheral surface of the contracted portion 25a may be in a state where there is a slight gap between the inner peripheral surface of the inner tube 27 and the outer peripheral surface. If it will be in the above states, the movement of the inner pipe 27 in the radial direction can be restricted, and noise due to the shake of the inner pipe 27 can be prevented when water hammer occurs.

  Noise due to the shake of the inner pipe 27 at the time of water hammer is likely to be generated at a bent portion of the double pipe 11. Therefore, for example, as shown in FIG. 1, in the place where the double pipe 11 rises from the underfloor slab 21 toward the sink 13, it is preferable to provide the sheath pipe contraction portions 25 a on both sides of the bent portion 11 a of the double pipe 11. . If it does in this way, the shake of the inner pipe 27 in the bending part 11a can be suppressed, and the noise by a water hammer can be prevented effectively. The contracted portion 25a of the sheath tube 25 is preferably fixed to a structure such as the underfloor slab 21 and the wall 23 by fixing members 29 such as clamps at both ends (or the entire length). In this way, since the contracted portion 25a can be prevented from extending (inner diameter is increased), the noise prevention effect can be maintained over a long period of time.

Explanatory drawing which shows one Embodiment of the inner pipe steadying structure of the double piping which concerns on this invention. The expanded sectional view which shows the principal part of the double piping used in FIG.

Explanation of symbols

11: Double piping 11a: Bending part 13: Sink 15: Water faucet 19: Floor 21: Under-floor slab 23: Wall 25: Saddle pipe 25a: Contraction part 27: Inner pipe 29: Fixing member

Claims (5)

  A double pipe in which an inner pipe for water supply or hot water supply is inserted into the sheath pipe, and the sheath pipe can be expanded and contracted in the axial direction.In the expanded state, the inner diameter is larger than the outer diameter of the inner pipe, and in the contracted state Using a corrugated tube whose inner diameter is smaller than that of the stretched state, and providing a contracted portion in which the sheath tube is shrunk in the axial direction in at least one position of the stretched sheath, and suppressing the shake of the inner tube at this contracted portion The inner pipe steadying structure of double piping characterized by   2. An inner pipe steadying structure for a double pipe according to claim 1, wherein the inner peripheral surface of the contracted portion of the sheath pipe is brought into contact with the inner pipe.   The double pipe inner tube steadying structure according to claim 1 or 2, wherein both ends or the entire length of the contracted portion of the sheath tube are fixed by a fixing member so that the contracted portion does not extend.   The double pipe having the inner pipe steadying structure of the double pipe according to claim 1, 2 or 3 is fixed to a structure such as a wall or a floor of a building at a contracted portion of the sheath pipe. How to fix heavy piping.   A method for constructing a water supply or hot water supply pipe, wherein the water supply or hot water supply pipe is constructed using the fixing method according to claim 4.

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