JP4782460B2 - Water pipe - Google Patents

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JP4782460B2
JP4782460B2 JP2005112245A JP2005112245A JP4782460B2 JP 4782460 B2 JP4782460 B2 JP 4782460B2 JP 2005112245 A JP2005112245 A JP 2005112245A JP 2005112245 A JP2005112245 A JP 2005112245A JP 4782460 B2 JP4782460 B2 JP 4782460B2
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sheath
pipe
tubular portion
peripheral surface
layer tubular
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JP2006292045A (en
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伸二 安江
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Inoac Corp
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Description

この発明は、ポリエチレン管等の合成樹脂からなるとともに非開削工法を用いて地中に埋設される上水道管に関するものである。   The present invention relates to a water supply pipe made of a synthetic resin such as a polyethylene pipe and embedded in the ground using a non-cutting method.

従来より、上水道用の水道管として、ポリエチレン管が用いられている。このポリエチレン管としては、例えば特許文献１に記載されるようなものが存在する。
特開２００２−３６４６４号公報 Conventionally, polyethylene pipes have been used as water pipes for waterworks. As this polyethylene pipe, there exists a thing as described in patent document 1, for example.
JP 2002-36464 A

ところで、従来、水道管の埋設は、埋設域全体を掘り起こす開削工法によって行われてきた。しかし、開削工法は交通の障害等となるので、近年は、地盤全体を掘り起こさない非開削工法が用いられている。この非開削工法において、水道管を新設する場合は、掘削機にてあらかじめ貫通させた貫通孔にポリエチレン管を挿通させ、また、水道管を更新する場合には、鉛管などの既設管を引き抜いた後の貫通孔にポリエチレン管を挿通させる。   By the way, the burial of the water pipe has been conventionally performed by an open-cut method that digs up the entire buried area. However, since the open-cut method is an obstacle to traffic, a non-open-cut method that does not dig up the entire ground has been used in recent years. In this non-open cutting method, when a water pipe is newly installed, a polyethylene pipe is inserted into a through-hole previously penetrated by an excavator, and when a water pipe is renewed, an existing pipe such as a lead pipe is pulled out. A polyethylene pipe is inserted through the rear through-hole.

ところが、ポリエチレン管を地中の貫通孔に挿通させると、その外周面に地中の石等が擦れて傷が付く。この傷が大きいと、ポリエチレン管の耐圧能力が低下したり、ジョイントと接続したときにその接続部の水密性が低下したりする問題がある。   However, when the polyethylene pipe is inserted into the underground through-hole, the underground stone or the like is rubbed and scratched on the outer peripheral surface. When this damage is large, there is a problem that the pressure resistance capability of the polyethylene pipe is lowered or the water tightness of the connection portion is lowered when connected to the joint.

この発明の目的は、合成樹脂からなるとともにその外周面に傷が付きにくい上水道管を提供することにある。   An object of the present invention is to provide a water supply pipe made of a synthetic resin and hardly damaged on the outer peripheral surface thereof.

上記目的を達成するため、請求項１に記載の発明は、非開削工法を用いて地中に埋設される上水道管であって、ポリエチレンからなる管本体の外周面に、同管本体とは別体の低密度ポリエチレンからなるさやを易剥離可能に被覆してなり、前記管本体は、水路を形成する内層管状部と、該内層管状部を内包するとともに該内層管状部よりも耐候性が付与された外層管状部とを備え、前記さやは、０．７〜１．１ｍｍの厚さに形成されるとともに、締まり嵌め状態で前記管本体を被覆し、前記さやの色を、前記管本体の外周面の色と異ならせたことを特徴とする。 In order to achieve the above object, the invention described in claim 1 is a waterworks pipe embedded in the ground using a non-open cutting method, and is provided on the outer peripheral surface of a pipe body made of polyethylene, separately from the pipe body. The sheath of the body is made of a low-density polyethylene sheath so that it can be easily peeled off, and the tube body includes an inner layer tubular portion that forms a water channel and the inner layer tubular portion, and is more weather resistant than the inner layer tubular portion. The sheath is formed to a thickness of 0.7 to 1.1 mm, covers the tube body in an interference fit state, and the color of the sheath is changed to that of the tube body. It is characterized by being different from the color of the outer peripheral surface.

この発明によれば、ポリエチレン等の合成樹脂からなる管本体の外周面がさやにより覆われているので、非開削工法下で地中に挿通されるときに管本体の外周面に傷がつかない。また、さやが管本体に対して易剥離可能であるため、ジョイントに接続する場合、管本体の端部からさやの端部を切断して容易に剥ぎ取ることができる。従って、合成樹脂からなるとともにその外周面に傷が付きにくい非開削工法に適した上水道管を提供することができる。   According to this invention, since the outer peripheral surface of the pipe body made of a synthetic resin such as polyethylene is covered with the sheath, the outer peripheral surface of the pipe main body is not damaged when being inserted into the ground under the non-opening method. . Further, since the sheath can be easily peeled from the tube body, when connecting to the joint, the sheath portion can be easily peeled off by cutting the end portion of the sheath. Therefore, it is possible to provide a water supply pipe that is made of a synthetic resin and is suitable for the non-cutting method in which the outer peripheral surface is hardly damaged.

また、さやを合成樹脂により形成するとともに押出被覆成形により管本体に被覆したので、例えば、管本体に合成樹脂テープを巻き付けてさやを構成した場合に較べて、より少ない工数で管本体の外周面をさやで被覆することができる。   In addition, since the sheath is formed of a synthetic resin and coated on the tube body by extrusion coating, the outer peripheral surface of the tube body is reduced in man-hours compared to, for example, the case where a sheath is formed by winding a synthetic resin tape around the tube body. Can be covered with a sheath.

さらに、さやの色を、管本体の外周面の色と異ならせたので、保管時等に、従来のさやを有しないポリエチレン管と容易に見分けるすることができる。また、管本体の端部からさやの端部を剥がしたことが明確に分るので、さやが被覆されたままの管本体に継手を接続するなどのミスを防止することができる。   Furthermore, since the color of the sheath is made different from the color of the outer peripheral surface of the tube main body, it can be easily distinguished from the conventional polyethylene tube without the sheath at the time of storage. Further, since it is clearly known that the end of the sheath has been peeled off from the end of the tube body, it is possible to prevent mistakes such as connecting a joint to the tube body with the sheath covered.

次に、この発明を具体化した一実施形態を図１及び図２に従って説明する。
図１に示すように、この実施形態の上水道管１０は、ポリエチレンからなる管本体１１と、この管本体１１を被覆するさや１２とから構成されている。なお、図１は、上水道管１０の端部から、さや１２の端部を取り除いている状態を示す。 Next, an embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the water supply pipe 10 of this embodiment includes a pipe body 11 made of polyethylene and a sheath 12 that covers the pipe body 11. FIG. 1 shows a state in which the end of the sheath 12 is removed from the end of the water supply pipe 10.

管本体１１は、図１及び図２に示すように、水路を形成する内層管状部１３と、この内層管状部１３を内包する外層管状部１４とを有し、外層管状部１４には、耐候性を付与するためのカーボンブラックが添加されている。   As shown in FIGS. 1 and 2, the tube body 11 includes an inner layer tubular portion 13 that forms a water channel, and an outer layer tubular portion 14 that encloses the inner layer tubular portion 13, and the outer layer tubular portion 14 has a weather resistance. Carbon black for imparting properties is added.

前記さや１２は、管本体１１の外周面１１ａに対して押出被覆成形されたものである。従って、さや１２は管本体１１に対して締まり嵌め状態となっており、管本体１１とは別体であるため、管本体１１から易剥離可能である。また、さや１２は、低密度ポリエチレン（Low Density Polyethylene）により０．７〜１．１ｍｍの厚さに形成されている。これにより、さや１２は、後述のように地中の貫通孔に上水道管１０を挿通させるときに管本体１１の外周面１１ａに傷が付かないように管本体１１を保護可能であるとともに、作業者が管本体１１の端部からさや１２を手で簡単に引き裂きながら剥ぎ取ることができる強度（５ｋｇｆ程度）となっている。また、さや１２の色は例えば青色とされ、カーボンブラックにより黒色を帯びた管本体１１（外層管状部１４）の外周面１１ａの色とは異ならせてある。   The sheath 12 is formed by extrusion coating on the outer peripheral surface 11 a of the tube body 11. Accordingly, the sheath 12 is in an interference fit state with respect to the tube main body 11 and is separate from the tube main body 11, and can be easily peeled off from the tube main body 11. Moreover, the sheath 12 is formed in the thickness of 0.7-1.1 mm with the low density polyethylene (Low Density Polyethylene). Thus, the sheath 12 can protect the pipe body 11 so that the outer peripheral surface 11a of the pipe body 11 is not damaged when the water supply pipe 10 is inserted into the underground through-hole as will be described later. The strength (about 5 kgf) is such that a person can tear off the sheath 12 from the end of the tube body 11 by hand. Further, the color of the sheath 12 is, for example, blue, and is different from the color of the outer peripheral surface 11a of the tube body 11 (outer layer tubular portion 14) which is blackish with carbon black.

以上のように構成されたこの上水道管１０は、地中において横方向に延びるように形成された貫通孔に挿通され、周知の継ぎ手を介して水道メータ等の水道器具が接続される。
上水道管１０を地中の貫通孔に挿通させるときに、管本体１１を被覆するさや１２の外周面に傷が付くが、さや１２に被覆された管本体１１の外周面１１ａには傷が付かない。このため、上水道管１０の耐圧能力を低下することなく維持できる。 The water supply pipe 10 configured as described above is inserted into a through hole formed so as to extend in the horizontal direction in the ground, and a water supply device such as a water meter is connected through a known joint.
When the water supply pipe 10 is inserted into the underground through hole, the outer peripheral surface of the sheath 12 covering the pipe main body 11 is damaged, but the outer peripheral surface 11a of the pipe main body 11 covered with the sheath 12 is damaged. No. For this reason, it can maintain, without reducing the pressure | voltage resistant capability of the waterworks pipe 10. FIG.

貫通孔から外部に延出された上水道管１０の端部をジョイントに接続するときには、上水道管１０の端部からさや１２の端部を剥ぎ取る。このとき、さや１２は、管本体１１と別体であるため、切断により管本体１１から容易に剥ぎ取られる。そして、上水道管１０の端部に露出した管本体１１にジョイントが接続される。このとき、管本体１１の端部の外周面１１ａに傷がないので、ジョイントとの接続部分の水密性が低下することがなく、接続を確実に行うことができる。   When connecting the end portion of the water supply pipe 10 extended from the through hole to the joint, the end portion of the sheath 12 is peeled off from the end portion of the water supply pipe 10. At this time, since the sheath 12 is separate from the tube main body 11, it is easily peeled off from the tube main body 11 by cutting. The joint is connected to the pipe body 11 exposed at the end of the water supply pipe 10. At this time, since the outer peripheral surface 11a at the end of the tube main body 11 is not damaged, the watertightness of the connection portion with the joint is not lowered, and the connection can be reliably performed.

従って、上記したこの実施形態によれば、非開削工法に適した上水道管１０を提供することができる。
また、さや１２を、押出被覆成形により管本体１１の外周面１１ａに被覆したので、例えば、管本体１１に合成樹脂テープを巻き付けてさや１２を構成した場合に較べて、より少ない工数で管本体１１の外周面１１ａをさや１２で被覆することができる。 Therefore, according to this embodiment described above, it is possible to provide the water supply pipe 10 suitable for the non-open cutting method.
Further, since the sheath 12 is coated on the outer peripheral surface 11a of the tube main body 11 by extrusion coating, for example, the tube main body is reduced in man-hours compared with the case where the sheath 12 is formed by winding a synthetic resin tape around the tube main body 11. 11 can be covered with the sheath 12.

さらに、さや１２の色を、管本体１１の外周面１１ａの色と異ならせたので、保管時等に、従来のさやを有しないポリエチレン管と容易に見分けることができる。また、管本体１１の端部からさや１２の端部を剥がしたことが明確に分るので、さや１２が被覆されたままの管本体１１に継手を接続するなどのミスを防止することができる。   Furthermore, since the color of the sheath 12 is different from the color of the outer peripheral surface 11a of the tube body 11, it can be easily distinguished from a conventional polyethylene tube having no sheath at the time of storage. In addition, since it is clearly known that the end of the sheath 12 has been peeled off from the end of the tube body 11, it is possible to prevent mistakes such as connecting a joint to the tube body 11 with the sheath 12 still covered. .

なお、本実施形態は、次のように変更して具体化することもできる。
・ さや１２を、テープ状のポリエチレン樹脂を管本体１１に巻き付けて構成すること。 In addition, this embodiment can also be changed and embodied as follows.
The sheath 12 is formed by winding a tape-like polyethylene resin around the pipe body 11.

・ 管本体１１やさや１２を、ポリエチレンとは別の材質、例えばポリプロピレン、塩化ビニル等とすること。   -The pipe body 11 and the sheath 12 should be made of a material other than polyethylene, such as polypropylene or vinyl chloride.

一実施形態の上水道管の部を示す斜視図。The perspective view which shows the part of the waterworks pipe of one Embodiment. 上水道管の縦断面図。The longitudinal cross-sectional view of a waterworks pipe.

符号の説明Explanation of symbols

１０…上水道管、１１…管本体、１１ａ…外周面、１２…さや、１３…内層管状部、１４…外層管状部。   DESCRIPTION OF SYMBOLS 10 ... Waterworks pipe, 11 ... Pipe main body, 11a ... Outer peripheral surface, 12 ... Saya, 13 ... Inner layer tubular part, 14 ... Outer layer tubular part.

Claims (1)

非開削工法を用いて地中に埋設される上水道管であって、
ポリエチレンからなる管本体の外周面に、同管本体とは別体の低密度ポリエチレンからなるさやを易剥離可能に被覆してなり、
前記管本体は、水路を形成する内層管状部と、該内層管状部を内包するとともに該内層管状部よりも耐候性が付与された外層管状部とを備え、
前記さやは、０．７〜１．１ｍｍの厚さに形成されるとともに、締まり嵌め状態で前記管本体を被覆し、
前記さやの色を、前記管本体の外周面の色と異ならせたことを特徴とする上水道管。 A water pipe that is buried in the ground using a non-open-cut method,
The outer surface of the tube body made of polyethylene is covered with a sheath made of low-density polyethylene separate from the tube body so that it can be easily peeled off.
The tube main body includes an inner layer tubular portion that forms a water channel, and an outer layer tubular portion that includes the inner layer tubular portion and is provided with weather resistance than the inner layer tubular portion,
The sheath is formed to a thickness of 0.7 to 1.1 mm and covers the tube body in an interference fit state,
A water supply pipe characterized in that the color of the sheath is different from the color of the outer peripheral surface of the pipe body.
JP2005112245A 2005-04-08 2005-04-08 Water pipe Active JP4782460B2 (en)

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JP4782460B2 true JP4782460B2 (en) 2011-09-28

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Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03121391A (en) * 1989-10-04 1991-05-23 Fujikura Ltd Gas pipe to be imbedded in ground
JPH05263984A (en) * 1992-03-18 1993-10-12 Osaka Gas Co Ltd Polyolefine pipe
JPH10246359A (en) * 1997-03-06 1998-09-14 Sekisui Chem Co Ltd Synthetic resin pipe
JP2002267059A (en) * 1999-12-24 2002-09-18 Tokyo Gas Co Ltd Resin tube for burying pipe, and execution method thereof
JP2002036464A (en) * 2000-07-19 2002-02-05 Inoac Corp Polyethylene pipe
JP2004003542A (en) * 2002-05-31 2004-01-08 Inoac Corp Pipe with coating material

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