JP2002181652A - Method and device for sealing end of double pipe for gas piping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device for sealing an end of a double pipe for a gas piping having a short construction period and a low manufacturing/construction cost by using a sheet provided with a through-hole which can be freely opened and closed with a plug. SOLUTION: The method comprises the steps of surrounding an outer periphery of the vicinity of the end of a sleeve pipe 1 and a part of an outer periphery of a gas pipe 2 by a sheet 31 having flexibility and airtightness which comprises the through-hole 33 and the plug 34 capable of freely opening and closing the through-hole 33 and is provided with an airtight fastener capable of freely fastening mutually on both sides, forming a tubular body by fastening the airtight faster, and tying the vicinity of one end of the tubular body to the sleeve pipe 1 and the vicinity of the other end of the tubular body to the gas pipe 2, The plug 34 is opened and a gas leakage detection means is inserted into the through-hole 33 in a state where the clearance between the end of the sleeve pipe 1 and the periphery of the gas pipe 2 is sealed, thereby enabling detection of the presence or absence of the gas leakage from the gas pipe 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a device for sealing an end of a sheath tube and a gas pipe in a double pipe for a gas pipe, and more particularly to a gas pipe which can easily detect gas leakage from the gas pipe. The present invention relates to a method for sealing the end of a double pipe for gas and a device for sealing the end of a double pipe for gas piping.

[0002]

2. Description of the Related Art FIG. 4 is a sectional view showing a conventional double pipe for gas piping. In FIG. 4, a gas pipe 2 is provided inside a sheath pipe 1.
Is inserted, and a part of the gas pipe 2 is not surrounded by the sheath pipe 1, and the gap between the end of the sheath pipe 1 and the outer periphery of the gas pipe 2 is sealed by the seal member 3. Seal member 3
Referring to FIG. 3, a flexible and airtight sheet 31 and a sheet 31 formed on both sides of the sheet 31 which can be fastened to each other to form an airtight cylindrical body are described. The airtight fastener 32 is formed.

[0003] At both ends of the sheath tube 1, a seal member 3 surrounds the outer periphery near the end of the sheath tube 1 and the outer periphery of the gas tube 2, and an airtight fastener 32 is fastened to form an airtight tube. A cylindrical body is formed, and the vicinity of one end of the cylindrical body is bound to the sheath tube 1 by the sheath tube side band 4, and the vicinity of the other end is bound to the gas tube 2 by the gas tube side band 5. Thereby, the space between the sheath tube 1 and the gas tube 2 is sealed.

[0004] Further, a branch pipe 6 for detecting gas leakage is connected to the sheath pipe 1, one end of which is connected to the inside of the sheath pipe 1, and the other end of which is openable and closable with a plug 7. Is provided.
Therefore, the presence or absence of gas leakage from the gas pipe 2 can be detected by opening the stopper 7 and inserting the gas leak detecting means directly into the branch pipe 6 or inserting the suction part of the gas leak detecting means. .

[0005]

However, the prior art described above has a problem that the operation of joining the branch tube 6 to the sheath tube 1 is very troublesome, and the production cost of the sheath tube 1 increases. there were.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. By using a sheet provided with a through-hole that can be opened and closed by a plug, a gas pipe having a short construction period, a low production and construction cost, and a low cost. It is an object of the present invention to provide an end sealing method and an end sealing device for a double pipe for use.

[0007]

According to the present invention, there is provided a gas pipe double pipe comprising a sheath pipe and a gas pipe inserted inside the sheath pipe.
A method for sealing an end of a double pipe for gas piping, which seals a gap between an end of a sheath pipe and an outer periphery of a gas pipe, comprising a through-hole and a plug capable of opening and closing the through-hole. A step of surrounding the outer peripheral portion near the end of the sheath tube and a part of the outer peripheral portion of the gas pipe with a flexible and airtight sheet provided with a sealable fastener that can be fastened, and fastening the airtight fastener of the sheet. Forming a tubular body by tying a portion near one end of the tubular body to a sheath tube, and binding a portion near the other end to a gas pipe. With the gap between the end portion and the outer periphery of the gas pipe sealed, the plug is opened and gas leak detection means is inserted into the through hole to detect the presence or absence of gas leak from the gas pipe. It is.

Further, the end sealing device for a double pipe for a gas pipe according to the present invention is characterized in that a double pipe for a gas pipe comprising a sheath pipe and a gas pipe inserted into the inside of the sheath pipe is mutually fastened on both sides. A flexible and airtight sheet having a free airtight fastener and having a through hole, a stopper for opening and closing the through hole of the sheet, and one end of a cylindrical sheet formed by fastening the fastener And a gas pipe-side band that ties the other end of the tubular sheet to the outer circumference of the gas pipe. Surrounding the outer periphery of the gas tube and the outer periphery near the end of the tube, an airtight fastener is fastened to form a tubular body, and one end of the tubular body is tied to the sheath tube while the other end is closed. The end of the sheath tube is tied to a gas pipe, and the stopper is opened with both ends of the sheath tube sealed. To insert the gas leakage detection means through hole, which is constituted so as to be able to detect the presence or absence of gas leakage from the gas pipe.

[0009]

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a schematic view showing a seal portion thereof, and FIG. 3 is an exploded view of a sheet member. Note that the same reference numerals are given to the same portions as the conventional technology described with reference to FIG. 4, and description thereof will be omitted.
The sealing member 3 is made of a flexible and airtight sheet 31.
An airtight fastener 32 provided on both sides of the sheet 31 and capable of being fastened to each other and forming the sheet 31 into an airtight tubular body; a through hole 33 penetrating the sheet 31;
3 to open and close.

[0010] Then, the outer peripheral portion near the end of the sheath tube 1 and the outer peripheral portion of the gas tube 2 are surrounded, and an airtight fastener 32 is fastened to form an airtight cylindrical body. The vicinity of one end is tied to the sheath tube 1 by the sheath tube-side band 4, and the other end portion is tied to the gas tube 2 by the gas tube-side band 5, and the space between the sheath tube 1 and the gas tube 2. Is sealed.

Therefore, the stopper 34 is opened and the through hole 33 is opened.
The presence or absence of gas leakage from the gas pipe 2 can be easily detected by directly inserting the gas leak detecting means into the gas pipe or by inserting the suction part of the gas leak detecting means. In addition, since the sheet member 3 is provided with the through-hole 33 for connecting the gas leak detection means, there is no need to separately provide the branch pipe 6 in the sheath pipe 1, so that the construction cost can be reduced and the construction period can be shortened. . In addition, the airtight fastener 32 may be a mechanical fastening means, an adhesive type or a fusion type joining means, and the plug 34 may be a plug-in type, a screw type, or a valve. Appropriate means can be used.

[0012]

The method for sealing the end of a double pipe for a gas pipe according to the present invention is constructed as described above, so that it is not necessary to install a branch pipe in a sheath pipe, so that the construction cost is reduced. The period can be shortened.

Further, the end sealing device for a double pipe for a gas pipe according to the present invention can obtain the above-mentioned effects and can manufacture the sheath pipe at a low cost.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a schematic view of a seal portion of FIG.

FIG. 3 is a development view of a sheet member.

FIG. 4 is a cross-sectional view showing an example of a seal at an end of a conventional double pipe for gas piping buried underground.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sheath pipe 2 Gas pipe 3 Seal member 4 Sheath pipe side band 5 Gas pipe side band 31 Sheet 32 Hermetic fastener 33 Through hole 34 Plug

 ──────────────────────────────────────────────────続 き Continued on the front page (71) Applicant 594144050 Tajima Bussan Co., Ltd. 1-2-2 Enokojima, Nishi-ku, Osaka-shi (72) Inventor Hideki Watanabe 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nippon Steel Tube Inside (72) Inventor Atsushi Nakamura 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Within Nihon Kokan Co., Ltd. (72) Inventor Kenichi Kojima 88, Ono-cho, Tsurumi-ku, Yokohama-shi, Kanagawa Japan Japan Steel Pipe Construction Co., Ltd. (72) Inventor Koichi Tanaka 88, Ono-cho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture Inside Japan Steel Pipe Works Co., Ltd. (72) Inventor Hiroshi Ito 1-5-20 Kaigan, Minato-ku, Tokyo Tokyo Gas Co., Ltd. (72) Invention Person Mitsuo Yamada 1-5-20 Kaigan, Minato-ku, Tokyo Inside Tokyo Gas Co., Ltd. (72) Inventor Yoshinao Suya 1-5-20 Kaigan, Minato-ku, Tokyo East Gas Co., Ltd. (72) Inventor Tadaharu Kurono 1-2-2 Enokojima, Nishi-ku, Osaka-shi, Osaka F-term (reference) 2G067 AA16 BB12 CC04 DD18 3J071 AA02 BB11 CC11 DD30 EE38 FF03 3J106 AA01 AB03 BA01 BB01 BC10 BD01 BE13 BE33 CA16

Claims (2)

[Claims] 1. A gas pipe double pipe comprising a sheath pipe and a gas pipe inserted into the sheath pipe, the gas pipe double pipe sealing a gap between an end of the sheath pipe and an outer periphery of the gas pipe. A method for sealing an end of a pipe, comprising: a flexible and airtight sheet provided with a through-hole and a plug that can open and close the through-hole, and provided with airtight fasteners that can be fastened to each other on both sides. A step of surrounding an outer peripheral portion near an end and a part of an outer peripheral portion of the gas pipe; a step of forming a tubular body by fastening an airtight fastener of the sheet; and a vicinity of one end of the tubular body And a step of binding the other end portion to the gas pipe, and opening the stopper with the gap between the end of the sheath pipe and the outer periphery of the gas pipe closed. Gas leak detecting means is inserted into the through-hole to detect the presence or absence of gas leak from the gas pipe. End seal method of the double tube gas pipe, characterized in that the. 2. A double pipe for a gas pipe comprising a sheath pipe and a gas pipe inserted into the inside of the sheath pipe, wherein the double pipe for a gas pipe seals a gap between an end of the sheath pipe and an outer periphery of the gas pipe. An end sealing device comprising: a flexible and airtight sheet having an airtight fastener that can be fastened to each other on both sides and having a through hole; a stopper for opening and closing the through hole of the sheet; A sheath tube side band for binding one end of a tubular sheet formed by fastening the airtight fastener to an outer peripheral portion near an end portion of the sheath tube, and the other end of the tubular sheet to an outer peripheral portion of the gas tube. A gas pipe-side band to be attached, and surrounding the outer circumference of the gas pipe near the end of the sheath pipe by the sheet, fastening the airtight fastener to form a tubular body, and forming the tubular body. Bind one end of the body to the sheath tube and tie the other end to the gas tube With this configuration, the plug is opened in a state where both ends of the sheath tube are sealed, and a gas leak detection unit is inserted into the through hole, so that the presence or absence of gas leak from the gas tube can be detected. End pipe sealing device for double pipe for gas piping.