JP4371529B2 - Gas pipe riser pipe - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gas pipe riser pipe for connecting from an underground resin pipe to an outdoor gas equipment such as a gas meter or a header or a water heater on the ground.
[0002]
[Prior art]
This type of riser pipe for gas piping is known, for example, in JP-A-9-303670 and JP-A-10-238687. There, a lower end of a metal tube made of a metal flexible tube or steel tube connected to a gas meter or the like on the ground and an upper end of a riser resin tube connected to an underground resin tube are connected by a riser pipe joint. Yes. The riser resin pipe is raised from the ground to the ground, and the outer surface of the riser resin pipe raised to the ground is covered with a protective pipe such as a steel pipe. The protective pipe and the riser pipe joint are connected by providing a male thread on the protective pipe and screwing the male thread into the female thread of the riser pipe joint. According to the riser pipe for gas piping, the metal pipe connected to the gas meter or the like is connected to the upper end portion of the riser resin pipe raised from the ground to the ground, so that the metal pipe is buried in the ground. Corrosion problems that occur in some cases can be eliminated. Since the riser resin tube launched on the ground is covered with a protective tube, it can be protected from accidental external force and fire, and weather resistance can be secured without problems such as UV degradation.
[0003]
[Problems to be solved by the invention]
However, the above-mentioned riser pipe for gas piping in which the protective pipe and the riser pipe joint are screw-connected requires troublesome screwing work, and the screw connection part is loosened by vibration or the like, thereby reducing the airtightness and sealing performance. If the protective pipe is detached from the riser pipe joint and a fire is caused by this, or if the riser resin pipe is cracked, gas leaks from the riser resin pipe and leaks into the atmosphere from the protective pipe. There is a concern that it will cause a gas explosion accident.
[0004]
An object of the present invention is to solve such a problem, and by contriving the connection means between the riser pipe joint and the protective pipe, the screwing work at the connection portion can be omitted, and the workability is improved. An object of the present invention is to provide a gas pipe riser pipe that can improve the safety and improve the safety by ensuring the sealing performance while maintaining airtightness and preventing the protection pipe from being detached.
[0005]
[Means for Solving the Problems]
As shown in FIGS. 1 to 3, the invention according to claim 1 of the present invention is a riser connected to the lower end portion of the metal pipe 4 connected to the outdoor gas equipment on the ground and the underground resin pipe 5. The upper end portion of the resin pipe 7 is connected by a metal riser pipe joint 1, and the riser resin pipe 7 is raised from the ground to the ground, and the outer surface of the riser resin pipe 7 raised to the ground is protected. In the riser pipe for gas piping covered with the pipe 8, a stiffener 24 is attached to the inner periphery of the upper end of the riser resin pipe 7, and the upper end of the riser resin pipe 7 is inserted into the riser fitting 1. The diameter of the riser resin pipe 7 is increased later, and the outer peripheral surface of the upper end portion of the riser resin pipe 7 is pressed against the inner circumference of the receiving port 13 of the riser fitting 7 by the stiffener 24. under And has, provided on a lower end edge of the riser pipe joint 1 Ri Shimetsuketea or in an airtight manner to the upper end of the protective tube 8, the lower edge of the riser pipe joint 1, the annular groove formed in a cross-sectional channel-shaped 26, and the inner and outer edges 27, 28 inside and outside of the annular groove 26, the upper end of the protective tube 8 is inserted into the annular groove 26, and the outer edge 28 is crimped to the upper end of the protective tube 8. the lower end of the stiffener 24 is the outer edge 28 that is caulked to the protective tube 8 has reached the underground resin pipe 5 side and has a characteristic to Rukoto.
[0006]
According to the riser pipe for gas piping according to claim 1, since the metal pipe is connected to the upper end portion of the riser resin pipe raised from the ground to the ground, like the conventional riser pipe described above, Corrosion problems that occur when this metal pipe is buried in the ground can be solved, and the riser resin pipe launched on the ground is covered with a protective pipe, so it can be protected from accidental external force and fire, UV deterioration, etc. In particular, the lower edge of the riser fitting is airtightly caulked to the upper end of the protective pipe, so that the screwing work can be omitted and the workability is improved. The sealing performance between the edge and the upper end portion of the protective tube can always be reliably maintained, and the protective tube can be prevented from being detached from the riser fitting due to vibration or the like.
[0007]
Also, the lower edge of the riser pipe joint 1 has an annular groove 26 formed in cross section the groove shape, after assumed to have inner and outer edges 27 and 28 into and out of the annular groove 26, the annular groove 26 since caulked to outer edge 28 to the upper end of the protective tube 8 is inserted into the upper end of the protective tube 8, the caulking work is Ru can reliably easily.
[0008]
[0009]
[0010]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a side view showing a state where a gas pipe riser pipe according to an embodiment of the present invention is piped, FIG. 2 is a front view showing a state where a gas pipe riser pipe according to an embodiment of the present invention is piped, and FIG. FIG. 4 is an enlarged cross-sectional view of a metal pipe joint of a riser pipe for gas piping according to an embodiment of the present invention.
[0011]
1 and 2, a gas pipe riser pipe A is a metal flexible pipe having a lower end connected to an upper end side of a metal riser pipe joint 1 and an upper end connected to a gas meter 2 on the ground via a gas meter unit 3, respectively. Or the metal pipe 4 which consists of steel pipes, and the upper end consists of the riser resin pipe 7 which consists of the polyethylene pipe | tube respectively connected by the lower end side of the riser pipe joint 1 and the lower end to the underground resin pipe 5 via the buried joint 6. . The riser resin tube 7 is raised from the ground to the ground, and the outer surface of the riser resin tube 7 raised to the ground is covered with a metal protective tube 8 made of a stainless steel tube or the like. The outlet side of the gas meter 2 is piped into the building by a resin-coated metal flexible pipe 9 and connected to each gas appliance in the building. The upper end of the metal pipe 4 may be connected to an outdoor gas device such as a header or a water heater in addition to being connected to the gas meter 2 on the ground.
[0012]
In FIG. 3, the metal riser pipe joint 1 is formed in a cylindrical shape, and a female thread 12 to which a male thread 11 of another metal pipe joint 10 attached to the lower end of the metal pipe 4 is screwed is formed on the inner periphery of the upper end. A receiving port 13 into which the upper end portion of the riser resin tube 7 is inserted and connected is formed at the lower portion thereof so as to communicate with the inside having the female screw 12. A biting tooth 14 is provided on the inner periphery of the receptacle 13, and an annular concave groove 16 in which a seal packing 15 made of a rubber ring is accommodated is formed inside the biting tooth 14. Further, a step portion 23 is formed in the inner depth portion from the concave groove 16 in the receiving port 13.
[0013]
The metal pipe 4 connected to the upper end side of the riser pipe joint 1 is made of a resin-coated metal flexible pipe in the illustrated example, and its outer surface is covered with a resin coating 4a. It is connected via a joint 10. As shown in FIG. 4, the metal pipe joint 10 has a cylindrical joint body 18 having a male thread 11 on the outer periphery of the lower end and a female thread 17 on the inner periphery of the upper end, a push ring 19 screwed into the female thread 17 of the joint body 18, An O-ring 21 fitted into a receiving surface 20 provided in the inner part of the joint body 13 from the internal thread 17 and a C-shaped cross section provided between the receiving surface 20 and the tip of the presser wheel 19 can be expanded and contracted. And a metal holder 22. The lower end portion of the metal tube 4 made of a resin-coated metal flexible tube is placed in a push ring 19 that is lightly screwed into the joint body 18, and one or two peaks 41 of the lower end portion of the metal tube 4 are in the holder 22. Until it protrudes inward from the holder 22. Next, when the pusher wheel 19 is screwed further deeply and the holder 22 is pushed in, the one or two peaks 41 of the lower end of the metal tube 4 are crushed between the holder 22 and the receiving surface 20 of the joint body 18 and sandwiched. Then, the metal tube 4 is connected to the joint body 18 in a retaining state. A waterproof packing 36 seals between the inner periphery of the push ring 19 and the outer periphery of the resin coating 4 a of the metal tube 4. Thus, the male pipe 11 of the metal pipe joint 10 connected to the lower end of the metal pipe 4 is screwed into the female thread 12 provided on the inner periphery of the upper end of the riser pipe joint 1, whereby the metal pipe 4 is connected to the riser pipe joint 1. Connected to the upper end.
[0014]
In FIG. 3, the riser resin pipe 7 connected to the lower end side of the riser pipe joint 1 has a stiffener 24 attached to the inner periphery of the upper end thereof. In order to connect the riser resin pipe 7 to the lower end side of the riser pipe joint 1, the upper end portion of the riser resin pipe 7 is inserted into the receiving port 13 until it contacts the stepped portion 23 in the receiving port 13 of the riser pipe fitting 1 through the insulating ring 25. Then, a diameter expansion tool (not shown) is inserted from the upper end of the riser pipe joint 1 to expand the stiffener 24, and the outer peripheral surface of the upper end portion of the riser resin pipe 7 is pressed against the inner periphery of the receiving port 13 by this diameter expansion action. The bite engages with the bite teeth 14. At that time, the seal packing 15 is compressed by the outer peripheral surface of the upper end portion of the riser resin tube 7, and a gap between the outer peripheral surface of the upper end portion of the riser resin tube 7 and the inner periphery of the receiving port 13 is sealed. The lower end of the riser resin pipe 7 is buried in the ground and connected to the underground buried resin pipe 5 via the buried joint 6.
[0015]
The outer surface of the portion of the riser resin tube 7 that is raised on the ground is covered with a metal protective tube 8 to protect it from accidental external force and fire, and to prevent it from being deteriorated by ultraviolet rays or the like. The protective tube 8 covers not only the ground portion of the riser resin tube 7 but also the outer surface of the underground portion that is continuously buried from the ground portion to a predetermined depth. That is, the lower end of the protective tube 8 is buried to a predetermined depth in the ground. The protective tube 8 may be made of a flame retardant plastic, a flame retardant reinforced plastic, ceramics, concrete, or the like in addition to the metal.
[0016]
The upper end of the protective tube 8 is connected to the lower end edge of the riser fitting 1 by caulking. In this caulking, as shown in FIG. 3, the lower end edge of the riser fitting 1 is formed in a cross-sectional groove shape in advance to form an annular groove 26, an inner edge 27 inside the annular groove 26, and an outer side of the annular groove 26. After forming the shape having the outer edge 28, the upper end of the protective tube 8 is inserted into the groove 26, and the outer edge 28 is caulked with a tool to keep the outer periphery of the upper end of the protective tube 8 airtight without gaps. Squeeze. According to this caulking work, pipe construction can be carried out simply and quickly compared to the screwing work.
[0017]
Since the seal between the lower end edge of the riser pipe joint 1 and the upper end portion of the protective pipe 8 that is caulked in this way can be kept airtight, and in the unlikely event that a fire is encountered, the riser resin pipe Even if a gas is leaked from the riser resin tube 7 due to a crack in the tube 7, it can be prevented from leaking into the atmosphere from the protective tube 8, and rain water can be prevented from entering the protective tube 8. it can. Further, even if the protective tube 8 is subjected to vibration or the like, it will not be detached from the riser fitting 1. In particular, the upper end portion of the protective tube 8 is inserted into the annular groove 26 between the inner and outer edges 27 and 28 of the lower end edge of the riser pipe joint 1 and the upper end portion of the protective tube 8 is moved inward and outward by caulking the outer edge 28. It is pinched by the edges 27 and 28, and a reliable and strong airtight state is obtained.
[0018]
At that time, a ceramic adhesive based on magnesia, alumina, zirconia or the like having a high coefficient of thermal expansion is provided between the outer edge 28 at the lower end of the riser pipe joint 1 and the outer peripheral surface of the upper end portion of the protective tube 8 (for example, ODEC Co., Ltd.). When a heat-resistant sealing material 29 such as CERAMABOND 571 (trade name) manufactured by the company is interposed, it is possible to further improve the sealing performance in addition to maintaining the airtightness by caulking when encountering a fire.
[0019]
FIG. 5 shows a half-cut cross-sectional view of the gas pipe riser pipe of the reference example. The gas pipe riser pipe of this reference example is different from that of the embodiment in the connection means of the riser resin pipe 7 and the protective pipe 8 to the riser pipe joint 1, and other configurations, for example, the metal pipe 4 to the riser pipe joint 1 The connection means and the like are exactly the same as those in the embodiment.
[0020]
In the reference example, the riser pipe joint 1 is formed in a cylindrical shape, and a flange 30 is formed at the intermediate portion in the vertical direction of the outer surface, and the outer diameter of the lower end portion below the flange 30 is smaller than the outer diameter of the flange 30. A resin tube receiving surface 32 is formed, and the diameter between the upper end of the resin tube receiving surface 32 and the flange 30 is smaller than the outer diameter of the flange 30 and larger than the outer diameter of the resin tube receiving surface 32. The protective tube receiving surface 31 is formed in a stepped shape. An annular unevenness 33 is formed on the resin tube receiving surface 32. In the inner periphery of the upper end above the flange 30 of the riser pipe joint 1, the female thread 12 to which the male thread 11 of the metal pipe joint 10 attached to the lower end of the metal pipe 4 is screwed is provided. Is the same.
[0021]
The upper end portion of the riser resin pipe 7 is press-fitted to the entire circumference of the resin pipe receiving surface 32 of the riser pipe joint 1. An O-ring 34 is interposed between the resin tube receiving surface 32 and the inner surface of the upper end portion of the riser resin tube 7 as necessary. The outer peripheral surface of the upper end portion of the riser resin tube 7 fitted on the resin tube receiving surface 32 and the protective tube receiving surface 31 of the riser pipe joint 1 are substantially flush with each other. The upper end portion of the protective tube 8 that covers the outer surface of the riser resin tube 7 is press-fitted to the entire circumference of the protective tube receiving surface 31. In this case, an outward flange 8 a is attached to the upper end portion of the protective tube 8, and the flange 8 a is in contact with the lower surface of the flange 30 of the riser pipe joint 1. Further, a reinforcing ring 35 made of metal such as stainless steel is fitted and caulked to the outer periphery of the upper end portion of the protective tube 8, whereby the reinforcing ring 35 is used to wrap the entire upper end portion of the protective tube 8, particularly on the protective tube receiving surface 31. Tighten the entire circumference of the part corresponding to.
[0022]
When the upper end of the protective tube 8 is press-fitted into the protective tube receiving surface 31 on the outer periphery of the riser pipe joint 1 and is strongly tightened by the reinforcing ring 35, the riser tube is the same as the protective tube 8 of the embodiment. It can be easily connected to the joint 1 in an airtight state to ensure a sealing property, and can be prevented from being detached from the riser pipe joint 1 even when the protective tube 8 is subjected to vibration or the like.
[0023]
Also in the case of the reference example, the same heat-resistant sealing material (not shown) such as a ceramic adhesive between the protective tube receiving surface 31 of the riser pipe joint 1 and the inner peripheral surface of the upper end portion of the protective tube 8 is used. In the case where a fire is encountered, the sealing performance can be further enhanced in combination with the press-fitting of the protective tube 8 and the airtightness maintenance by caulking of the reinforcing ring 35.
[0024]
【The invention's effect】
According to the riser pipe for gas piping of the present invention, the protective pipe can be easily and quickly connected to the riser pipe joint to improve workability, and the airtightness between the upper end of the protective pipe and the riser pipe joint is always maintained. The protective tube can be securely held, and the safety tube can be safely removed without being accidentally detached from the riser fitting due to vibration or the like.
[Brief description of the drawings]
FIG. 1 is a side view showing a state in which a gas pipe riser pipe of an embodiment is piped.
FIG. 2 is a front view showing a state where the gas pipe riser pipe of the embodiment is piped.
FIG. 3 is a half cutaway cross-sectional view of a gas pipe riser pipe according to an embodiment.
FIG. 4 is an enlarged cross-sectional view of a metal pipe joint of a gas pipe riser pipe according to an embodiment.
FIG. 5 is a half-cut cross-sectional view of a gas pipe riser pipe of a reference example.
[Explanation of symbols]
A Gas riser pipe 1 Riser pipe joint 2 Gas meter 4 Metal pipe 5 Underground resin pipe 7 Riser resin pipe 8 Protective pipe 26 Annular groove 27 Inner edge 28 Outer edge 29 Heat-resistant sealing material 35 Reinforcement ring

Claims (1)

The lower end of the metal pipe connected to the ground outdoor gas equipment and the upper end of the riser resin pipe connected to the underground buried resin pipe are connected by a metal riser pipe joint, and the riser resin pipe is In the riser pipe for gas piping, which is launched from the ground to the ground, the outer surface of the riser resin pipe launched on the ground is covered with a protective pipe.
A stiffener is attached to the inner periphery of the upper end of the riser resin tube,
The stiffener is expanded in diameter after the upper end of the riser resin pipe is inserted into the riser pipe joint,
The outer peripheral surface of the upper end portion of the riser resin pipe is pressed against the inner circumference of the receptacle of the riser pipe joint by the stiffener,
The receptacle of the riser pipe joint is provided at the lower end of the riser pipe joint, and the lower end edge of the riser pipe joint is airtightly crimped to the upper end portion of the protective pipe,
The lower end edge of the riser pipe joint is formed into a cross-sectional groove shape and has an annular groove and inner and outer edges inside and outside of the annular groove.
Insert the upper end of the protective tube in the annular groove Ri Kashimetea the outer edge upper end portion of the protective tube,
The lower end of the stiffener, the gas pipe riser pipe, characterized that you have reached to the underground resin pipe side of the outer edge that is crimped to the protective tube.

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