JP5102126B2 - Piping material with protective layer - Google Patents

Piping material with protective layer Download PDF

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JP5102126B2
JP5102126B2 JP2008170219A JP2008170219A JP5102126B2 JP 5102126 B2 JP5102126 B2 JP 5102126B2 JP 2008170219 A JP2008170219 A JP 2008170219A JP 2008170219 A JP2008170219 A JP 2008170219A JP 5102126 B2 JP5102126 B2 JP 5102126B2
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protective layer
piping material
piping
pipe
main pipe
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JP2010007814A (en
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和美 外山
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Mitsubishi Plastics Inc
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Description

本発明は、給水管や給湯管などとして、一戸建て住宅や集合住宅、ビルや各種施設の床下や天井裏、壁の中などに敷設される配管材に関する。   The present invention relates to a piping material that is laid in a single-family house or apartment house, under a floor, behind a ceiling, or in a wall as a water supply pipe or hot water supply pipe.

一戸建てや集合住宅のリフォーム工事で、部屋の間取りを変えるために洗面所などの水廻り設備を移設する場合、移設場所まで給水管や給湯管、排水管を敷設する配管工事が行われる。従来、この工事は、配管材が通る部分の床板を剥がして根太や土台を避けるように配管材を設置し、適当な位置で配管材をブラケットやバンドなどで固定し、さらに必要に応じて配管材の外周をグラスウールや粘着テープなどで保護するという手順で行われ、作業が大掛かりとなって手間を要し、工期とコストがかかるものであった。   When renovating a detached house or an apartment house, water facilities such as a washroom are relocated to change the room layout, and piping work is performed to lay water pipes, hot water pipes, and drain pipes to the relocation site. Conventionally, this work is done by peeling off the floor board where the piping material passes and installing the piping material so as to avoid joists and foundations, fixing the piping material with brackets or bands at appropriate positions, and piping as necessary The procedure was to protect the outer periphery of the material with glass wool, adhesive tape, etc., which required a lot of work and time and cost.

そこで、床上から床下の狭い空間内に配管材を通して設置することができるようにするべく、合成樹脂製の本管の外周面に保護層を設けてなる保護層付きの配管材が前記リフォーム工事に利用されつつある。この保護層付き配管材は、可撓性を有する本管の外周面を、保護層を形成する5mm〜10mm程度の厚みの発泡ポリスチレンで覆った構成のものであり、保護層の表面をフィルムで覆い且つ圧縮して管径を小さくした状態で床上から床下に配管材を敷設する工事に供し、設置後はフィルムを除去して保護層を元の大きさに復元させることにより、保護層が緩衝材となって本管の表面に傷ができることを防止するようにしたものである(例えば特許文献1参照)。   Therefore, in order to be able to install the piping material in a narrow space under the floor from the floor, the piping material with a protective layer formed by providing a protective layer on the outer peripheral surface of the synthetic resin main pipe is used for the renovation work. It is being used. This piping material with a protective layer has a configuration in which the outer peripheral surface of a flexible main pipe is covered with foamed polystyrene having a thickness of about 5 mm to 10 mm to form a protective layer, and the surface of the protective layer is a film. Covered and compressed to reduce the pipe diameter, the pipe material was laid from the floor to the floor, and after installation, the film was removed to restore the protective layer to its original size, thereby buffering the protective layer. This prevents the surface of the main pipe from being damaged as a material (see, for example, Patent Document 1).

特開2006−234073号公報JP 2006-234073 A

従来の保護層付き配管材は、本管の周囲が保護層で覆われているため、設置作業の際に既設の固定物に本管が衝突したり擦れたりしても表面に傷ができることはない。しかし、例えば床下の狭い空間内を通すために、床下の既設の固定物の上面を跨ぐようにして配管材を設置していた場合に、給水栓の開閉操作に伴うウォーターハンマーが発生し、前記固定物上で配管材が上下左右に波打つように振動すると、それにより固定物と接する保護層の表面に摩擦による亀裂が生じて本管が剥き出しとなり、固定物と擦れて本管表面に傷ができて、そこから漏水に至る事態も生じかねない。そのため、ウォーターハンマーが発生しても配管材がぶれないように、敷設した配管材を規定長で支持する処置を施さなければならなかった。
すなわち、前記従来の保護層付き配管材を用いることにより、床下への配管敷設作業を、床板全体を剥がさずに床上から行えたとしても、床下に敷設した配管材を規定長で支持するには、支持位置の直ぐ上の部分の床板を剥がさなければならず、リフォーム工事が大掛かりになることに変わりはなかった。
Conventional piping material with a protective layer is covered with a protective layer around the main pipe, so the surface can be damaged even if the main pipe collides with or rubs against existing fixed objects during installation work. Absent. However, for example, when the piping material is installed so as to straddle the upper surface of an existing fixed object under the floor in order to pass through a narrow space under the floor, a water hammer is generated due to the opening / closing operation of the water tap, When the piping material vibrates in the vertical and horizontal directions on the fixed object, it causes a crack due to friction on the surface of the protective layer in contact with the fixed object, causing the main pipe to be exposed and rubbing against the fixed object to damage the main pipe surface. It is possible that there will be a situation where water leaks from there. For this reason, it has been necessary to take measures to support the installed piping material with a specified length so that the piping material does not shake even if a water hammer occurs.
That is, by using the conventional piping material with a protective layer, to support the piping material laid under the floor with a specified length even if the piping laying operation under the floor can be performed from the floor without peeling off the entire floor plate. The floor board just above the support position had to be peeled off, and the renovation work was still a big deal.

本発明は従来技術の有するこのような問題点に鑑み、リフォームなどで建物に新たな管材を敷設する場合に、室内から床下や壁の中などに管材を敷設することができ、管材を支持する処置をしなくとも敷設された管材が確実に保護されるようにすることを課題とする。   In view of such problems of the prior art, the present invention can support a pipe material by laying the pipe material from the room under the floor or in the wall when laying a new pipe material in the building by renovation or the like. It is an object of the present invention to ensure that the laid pipe material is protected without taking any measures.

ウォーターハンマーにより配管材が振動するのは、急激な管内の圧力変動が衝撃波となって配管材を伝わるためであり、前記振動が発生した際、既設の固定物との間で摩擦が起きないように保護層で衝撃波を吸収することが可能であれば、配管材を規定長で支持しなくとも保護することができると考えられる。
従来の保護層付き配管材は、保護層を保温層としても機能させるため、密度25kg/m程度の発泡ポリスチレンで本管の外周を5mm〜10mm程度の厚みで覆って構成してあるが、かかる成形条件の保護層では、振動発生時の衝撃吸収能が低く、固定物との接点が摩耗し、亀裂が生じることは避けられない。
The piping material is vibrated by the water hammer because rapid pressure fluctuations in the pipe are transmitted as shock waves to the piping material, so that friction does not occur with existing fixed objects when the vibration occurs. If the shock wave can be absorbed by the protective layer, it is considered that the piping material can be protected without being supported at a specified length.
The conventional piping material with a protective layer is configured to cover the outer periphery of the main pipe with a thickness of about 5 mm to 10 mm with foamed polystyrene having a density of about 25 kg / m 3 in order to make the protective layer function as a heat insulating layer. The protective layer under such molding conditions has a low impact absorption capability when vibration is generated, and it is inevitable that the contact with the fixed object is worn and cracked.

本発明は、ウォーターハンマーが発生した際に配管材を伝わる衝撃波を吸収するのに最適な保護層の成形条件について鋭意研究を行ったところ、特に保護層を構成する素材の密度が所定範囲内の場合に高い衝撃吸収能を発揮し、配管材の振動を吸収することができることを見出してなされたものである。   The present invention has intensively studied the molding conditions of the protective layer optimal for absorbing the shock wave transmitted through the piping material when the water hammer is generated, and in particular, the density of the material constituting the protective layer is within a predetermined range. In this case, it has been found that a high shock absorbing ability can be exhibited and vibrations of the piping material can be absorbed.

すなわち、本発明は、合成樹脂製の本管の外周面を保護層で被覆してなる保護層付き配管材において、前記保護層はその密度が10kg/m〜20kg/mであって体積を圧縮可能な弾性材により形成されていることを特徴とするものである。 That is, the present invention relates to a piping material with a protective layer formed by covering the outer peripheral surface of a main pipe made of synthetic resin with a protective layer, and the protective layer has a density of 10 kg / m 3 to 20 kg / m 3 and has a volume. Is formed of an elastic material that can be compressed.

また、前記構成において、呼び径が16以下の本管に対して、保護層が外径55mm以上の厚みに形成されてなることを特徴とするものである。
さらに、保護層の表面を圧縮し且つプラスチックフィルムで被覆して、外径38mm以下に保護層を保持してなることを特徴とするものである。
前記プラスチックフィルムとしては、厚さ50μm、収縮率69%の熱収縮性ポリエチレンテレフタレートからなるフィルムを用いることが好ましい。
Further, in the above structure, a protective layer is formed with a thickness of 55 mm or more for a main pipe having a nominal diameter of 16 or less.
Furthermore, the surface of the protective layer is compressed and covered with a plastic film, and the protective layer is held at an outer diameter of 38 mm or less.
As the plastic film, it is preferable to use a film made of heat-shrinkable polyethylene terephthalate having a thickness of 50 μm and a shrinkage rate of 69%.

本発明の保護層付き配管材によれば、例えば水廻りのリフォーム工事で床下に敷設する場合、床下の既設の固定物の上面に保護層表面を接して設置することができ、配管材は固定物と接する保護層の下部表面を適宜な深さに凹ませて固定物上に敷設される。保護層の表面を圧縮してプラスチックフィルムで被覆する場合、敷設後にフィルムを破断して除去し、保護層を元の大きさ(体積)に復元させた状態で設置される。
この場合に、ウォーターハンマーの発生に伴い配管材が振動しても、振動の主体である本管が弾性に富んだ保護層で覆われており、また、固定物との接触面で保護層が適宜な深さに凹んで固定物上に載り、固定物との接触面積が大きく確保されているので、配管材の振動に伴い固定物上で保護層が振動方向に適宜揺動し、或いは転動するだけで、保護層と固定物の接触面が互いに擦れることはなく、また、接触面で擦れたとしても前記接触面積が大きいため、摩擦による応力が保護層表面に集中して作用することはない。
According to the piping material with a protective layer of the present invention, for example, when laying under the floor in a renovation work around water, the surface of the protective layer can be installed in contact with the upper surface of an existing fixed object under the floor, and the piping material is fixed. The lower surface of the protective layer in contact with the object is laid on the fixed object with the appropriate depth recessed. When the surface of the protective layer is compressed and covered with a plastic film, the film is broken and removed after laying, and the protective layer is installed in a state where the original size (volume) is restored.
In this case, even if the piping material vibrates due to the generation of the water hammer, the main main body of the vibration is covered with an elastic protective layer, and the protective layer is in contact with the fixed object. Since it is recessed to an appropriate depth and rests on the fixed object, and a large contact area is secured, the protective layer is appropriately swung or vibrated in the vibration direction on the fixed object as the piping material vibrates. The contact surface of the protective layer and the fixed object does not rub against each other only by moving, and even if rubbed on the contact surface, the contact area is large, so that stress due to friction is concentrated on the surface of the protective layer. There is no.

本発明の保護層付き配管材によれば、ウォーターハンマーが発生して配管材が振動したとしても、配管を伝わる衝撃波を保護層で吸収して振幅を弱めるとともに、保護層と固定物との接触面が互いに擦れることを防止して保護層表面に摩耗による亀裂が生じることを確実に防止することができるので、リフォーム工事で床下や壁面に新たに敷設するときでも配管材を支持する処置を施す必要はなく、リフォーム工事を手間をかけずに短期間で行うことが可能である。
また、本管の外周を覆う弾性材からなる保護層は断熱材としての機能も奏し、また、本管を流れる水や温水の流水音を遮断する防音材としても機能する。
According to the piping material with a protective layer of the present invention, even if the water hammer is generated and the piping material vibrates, the shock wave transmitted through the piping is absorbed by the protective layer to reduce the amplitude and the contact between the protective layer and the fixed object. Since the surfaces can be prevented from rubbing against each other and cracks due to wear can be reliably prevented from occurring on the surface of the protective layer, measures are taken to support the piping material even when newly laying under the floor or on the wall surface during renovation work. It is not necessary, and it is possible to perform the renovation work in a short period of time without taking time.
In addition, the protective layer made of an elastic material covering the outer periphery of the main pipe also functions as a heat insulating material, and also functions as a soundproofing material that blocks running water and hot water flowing through the main pipe.

本発明の保護層付き配管材において、本管としては可撓性を有する管材、例えばポリオレフィン管、ポリブデン管、ポリエチレン管、塩ビ管、或いは適宜な素材からなる蛇腹管などを用いることができ、また、保護層を構成する弾性材としては発泡ゴム、発泡ポリウレタン、発泡ポリエチレンなどの弾性材が好適であるが、本発明はこれら素材のものに限定されない。
本管としてポリオレフィン管やポリブデン管を用いた場合に、保護層の密度が10kg/mよりも小さいと、保護層を厚く設けても柔らかすぎて配管材の振動による衝撃を吸収できず、ウォーターハンマー発生時に固定物上で配管材が暴れて保護層表面に傷を付け易い。また、20kg/mよりも大きいと保護層の弾性が不足し硬化して本管と一体に振動し、固定物との接触面積も小さくなるため、摩擦による応力が小さな接触面内に集中し、保護層表面に亀裂を生じさせ易くなる。よって、保護層は前記密度の範囲で形成することが好ましい。
In the piping material with a protective layer of the present invention, as the main pipe, a flexible pipe material such as a polyolefin pipe, a polybden pipe, a polyethylene pipe, a PVC pipe, or a bellows pipe made of an appropriate material can be used. The elastic material constituting the protective layer is preferably an elastic material such as foamed rubber, foamed polyurethane, or foamed polyethylene, but the present invention is not limited to these materials.
When a polyolefin tube or polybden tube is used as the main tube, if the density of the protective layer is less than 10 kg / m 3 , even if the protective layer is thick, it is too soft to absorb the impact caused by the vibration of the piping material. When a hammer is generated, the piping material is exposed on the fixed object and the surface of the protective layer is easily damaged. On the other hand, if it is higher than 20 kg / m 3 , the protective layer is insufficiently elastic and hardens and vibrates integrally with the main pipe, reducing the contact area with the fixed object, so that the stress due to friction is concentrated on the small contact surface. It is easy to cause cracks on the surface of the protective layer. Therefore, the protective layer is preferably formed in the above density range.

リフォーム工事で床下などの空隙に配管材を敷設する場合、配管材の外径が38mm以下であれば前記空隙を通す作業がし易いことから、保護層の表面を圧縮し、フィルムで被覆した状態で配管材の外径が38mm以下となるように形成することが好ましい。一方、前記外径が38mm以下の配管材を敷設し、圧縮した保護層を解放して元の大きさに復元させた状態で、保護層がその外径が55mm以上となる厚みでなければ、これを固定物上に載せたときにウォーターハンマーの発生に伴って配管材を伝わる衝撃波を有効に吸収することができない。保護層の外径が55mmより小さいと、配管材の振動吸収効果が低下し、保護層と固定物との接触面が互い擦れて保護層表面に摩耗による亀裂が生じることがある。
よって、配管材は、保護層を圧縮して外周面をフィルムで覆った状態では外径が38mm以下、圧縮した保護層を解放して元の大きさに復元させた状態では外径が55mm以上となるように形成することが好ましい。その場合、本管は呼び径が16(実外径22mm)、13(実外径17mm)、10(実外径13mm)の管材が本管として用いられる。
When piping material is laid in a gap such as under the floor in renovation work, if the outer diameter of the piping material is 38 mm or less, it is easy to work through the gap, so the surface of the protective layer is compressed and covered with a film It is preferable that the outer diameter of the piping material is 38 mm or less. On the other hand, when the piping material having an outer diameter of 38 mm or less is laid and the compressed protective layer is released and restored to its original size, the protective layer is not thick enough to have an outer diameter of 55 mm or more. When this is placed on a fixed object, the shock wave transmitted through the piping material due to the generation of the water hammer cannot be effectively absorbed. When the outer diameter of the protective layer is smaller than 55 mm, the vibration absorption effect of the piping material is lowered, and the contact surface between the protective layer and the fixed object may rub against each other, and a crack due to wear may occur on the surface of the protective layer.
Therefore, the piping material has an outer diameter of 38 mm or less when the protective layer is compressed and the outer peripheral surface is covered with a film, and the outer diameter is 55 mm or more when the compressed protective layer is released and restored to its original size. It is preferable to form such that In this case, pipes having a nominal diameter of 16 (actual outer diameter of 22 mm), 13 (actual outer diameter of 17 mm), and 10 (actual outer diameter of 13 mm) are used as the main pipe.

また、前記条件で成形される保護層を圧縮して表面を被覆するフィルムとしては、厚さ50μm、収縮率69%の熱収縮性ポリエチレンテレフタレートからなるフィルムが、配管材を被覆して収縮した状態で外力を受けても破れ難く、保護層を圧縮させた状態を維持できて好ましいが、本発明はこれに限定するものではない。
配管材の敷設完了後、外周面のフィルムを除去する際の操作を容易にするため、予めフィルム内面に引裂片(糸)を封入しておいたり、収縮させたフィルムの表面にミシン目を設けたりしてもよく、適宜なフィルム除去手段を用いることができる。
In addition, as a film covering the surface by compressing the protective layer molded under the above conditions, a film made of heat-shrinkable polyethylene terephthalate having a thickness of 50 μm and a shrinkage rate of 69% is covered with the piping material and shrunk. However, it is preferable that the protective layer can be maintained in a compressed state even when external force is applied, but the present invention is not limited to this.
In order to facilitate the operation when removing the film on the outer peripheral surface after the laying of the piping material is completed, a tear piece (thread) is sealed in advance on the inner surface of the film, or a perforation is provided on the surface of the contracted film. An appropriate film removing means can be used.

以下、本発明の保護層付き配管材の好適な実施の形態を説明する。
図1は本発明の一実施形態の配管材の断面を示している。
同図に示された配管材1は、呼び径が16以下の可撓性を有する長尺な合成樹脂製の管材を本管11とし、その外周面を、密度が10kg/m〜20kg/mで体積を圧縮可能な弾性材からなる保護層12で被覆して形成してある。
Hereinafter, preferred embodiments of the piping material with a protective layer of the present invention will be described.
FIG. 1 shows a cross section of a piping material according to an embodiment of the present invention.
In the piping material 1 shown in the figure, a long synthetic resin tube material having a nominal diameter of 16 or less is used as a main tube 11, and its outer peripheral surface has a density of 10 kg / m 3 to 20 kg / It is formed by covering with a protective layer 12 made of an elastic material whose volume can be compressed at m 3 .

そして、同図(A)に示されるように、保護層12の外周表面を中心方向へ均等に圧縮し、且つ熱収縮性プラスチックフィルム13で覆って保護層12の圧縮状態を保持し、配管材1の外径を縮径した状態で敷設作業に供されるようになっている。このときの配管材1の外径(D1)は38mm以下に設けてある。また、同図(B)に示されるように、フィルム13を除去して保護層12を元の大きさに復元した状態で、配管材1の外径(D2)は55mm以上となるように設けてある。   And as shown to the same figure (A), the outer peripheral surface of the protective layer 12 is compressed uniformly to a center direction, and it covers with the heat-shrinkable plastic film 13, and maintains the compression state of the protective layer 12, piping material It is used for laying work in a state where the outer diameter of 1 is reduced. The outer diameter (D1) of the piping material 1 at this time is set to 38 mm or less. Further, as shown in FIG. 5B, the outer diameter (D2) of the piping material 1 is provided to be 55 mm or more in a state where the film 13 is removed and the protective layer 12 is restored to the original size. It is.

〔実施例1〕
呼び径16のポリオレフィン管を本管11とし、その外周面を密度20kg/mの発泡ポリウレタンからなる保護層12で被覆して、長さ10mの配管材1を形成した。配管材1の外径は55mmに設定した。
[Example 1]
A polyolefin pipe having a nominal diameter of 16 was used as a main pipe 11, and the outer peripheral surface thereof was covered with a protective layer 12 made of foamed polyurethane having a density of 20 kg / m 3 to form a piping material 1 having a length of 10 m. The outer diameter of the piping material 1 was set to 55 mm.

〔実施例2〕
呼び径10のポリオレフィン管を本管11とし、その外周面を密度10kg/mの発泡ポリウレタンからなる保護層12で被覆して、長さ10mの配管材1を形成した。配管材1の外径は55mmに設定した。
[Example 2]
A polyolefin pipe having a nominal diameter of 10 was used as a main pipe 11, and the outer peripheral surface thereof was covered with a protective layer 12 made of foamed polyurethane having a density of 10 kg / m 3 to form a piping material 1 having a length of 10 m. The outer diameter of the piping material 1 was set to 55 mm.

(配管材の耐久試験)
両実施例の配管材1を、床下の配管敷設空間に見立てたスラブ面上に敷設し、振動に対する耐久試験を行った。
配管材1を敷設したスラブ面は、図2に示されるように、スラブ面2上に高さ8cm、幅30cm、奥行き3cmの板状の障害物21を揺動不能に固着して構成し、配管材1の略中央を障害物21の上面に載せて配管材1を敷設した。
耐久試験は、敷設した配管材1の一端を給水栓に接続し、以下の試験条件で給水栓の開閉を行って擬似的にウォーターハンマーを連続的に発生させることにより行い、障害物21と接する部分の損傷の発生状況を観測した。
〈試験条件〉静水圧:0.23〜0.30MPa
ウォーターハンマー圧:1.10〜1.50MPa
圧力変動(栓開閉)周期:10秒/1サイクル
(Endurance test of piping materials)
The piping material 1 of both examples was laid on a slab surface as if it was a piping laying space under the floor, and a durability test against vibration was performed.
As shown in FIG. 2, the slab surface on which the piping material 1 is laid is configured by fixing a plate-like obstacle 21 having a height of 8 cm, a width of 30 cm, and a depth of 3 cm on the slab surface 2 so as not to swing, The piping material 1 was laid with the approximate center of the piping material 1 placed on the upper surface of the obstacle 21.
The endurance test is performed by connecting one end of the laid piping material 1 to a water tap, opening and closing the water tap under the following test conditions to continuously generate a pseudo water hammer, and contacting the obstacle 21. The occurrence of damage in the part was observed.
<Test conditions> Hydrostatic pressure: 0.23 to 0.30 MPa
Water hammer pressure: 1.10-1.50 MPa
Pressure fluctuation (plug open / close) cycle: 10 seconds / 1 cycle

実施例1、実施例2の配管材1は、ともに、スラブ面2上に敷設した状態で、図2に示されるように、配管材1の中央部分で、その保護層12の下側表面が6mm程凹み、この凹んだ部分に障害物21の先端が食い込んだ状態で障害物21の上面に接触していた。ウォーターハンマーを発生させると、保護層12の弾性により、障害物21の上部において障害物21の上面との接触面を支点として配管材1の周方向(同図中の矢印方向)へ僅かに転動するだけで、保護層12の表面と障害物21の上面との摩擦が生じ難い状態であった。
両実施例の配管材1は、ともにウォーターハンマーを10万回以上発生させても、保護層12の表面に亀裂などの損傷は生じなかった。
The piping material 1 of Example 1 and Example 2 is laid on the slab surface 2, and the lower surface of the protective layer 12 is at the center of the piping material 1 as shown in FIG. It was recessed about 6 mm and was in contact with the upper surface of the obstacle 21 with the tip of the obstacle 21 biting into the recessed portion. When the water hammer is generated, due to the elasticity of the protective layer 12, the upper part of the obstacle 21 is slightly turned in the circumferential direction of the piping material 1 (in the direction of the arrow in the figure) with the contact surface with the upper surface of the obstacle 21 as a fulcrum. Friction between the surface of the protective layer 12 and the upper surface of the obstacle 21 was difficult to occur simply by moving.
In both the piping materials 1 of both Examples, even if the water hammer was generated 100,000 times or more, damage such as cracks did not occur on the surface of the protective layer 12.

〔比較例1〕
従来の保護層付き配管材を用いて、前記と同様に配管材の耐久試験を行った。
従来の配管材1は、呼び径16のポリオレフィン管を本管11とし、その外周面を密度25kg/mの発泡ポリエチレンからなる保護層12で被覆して形成したものである。配管材1の外径は42mmに設定した。
スラブ面2上に敷設された配管材1は、図3に示されるように、障害物21の上面に載せた配管材1の略中央部分で保護層12の下側表面は殆ど変形せず、保護層12は元の形状を維持したままで障害物21の上面に接触していた。ウォーターハンマーを発生させると、障害物21の上部において配管材1が水平方向(同図中の矢印方向)へ滑るように振動して、保護層12の表面と障害物21の上面とが擦れていた。そして、この摩擦により、ウォーターハンマーを5万回程度発生させた時点で、保護層12の表面が破れてしまい、本管11が剥き出しとなった。
[Comparative Example 1]
Using a conventional piping material with a protective layer, a durability test of the piping material was performed in the same manner as described above.
The conventional piping material 1 is formed by using a polyolefin pipe having a nominal diameter of 16 as a main pipe 11 and covering the outer peripheral surface with a protective layer 12 made of foamed polyethylene having a density of 25 kg / m 3 . The outer diameter of the piping material 1 was set to 42 mm.
As shown in FIG. 3, the piping material 1 laid on the slab surface 2 hardly deforms the lower surface of the protective layer 12 at the substantially central portion of the piping material 1 placed on the upper surface of the obstacle 21. The protective layer 12 was in contact with the upper surface of the obstacle 21 while maintaining the original shape. When the water hammer is generated, the piping material 1 vibrates so that it slides in the horizontal direction (in the direction of the arrow in the figure) above the obstacle 21, and the surface of the protective layer 12 and the upper surface of the obstacle 21 are rubbed. It was. Then, due to this friction, when the water hammer was generated about 50,000 times, the surface of the protective layer 12 was torn and the main pipe 11 was exposed.

〔比較例2〕
呼び径16のポリオレフィン管を本管11とし、その外周面を密度21kg/mの発泡ポリウレタンからなる保護層12で被覆して、長さ10mの配管材1を形成した。配管材1の外径は55mmに設定した。
この配管材1を用いて前記と同様に配管材の耐久試験を行ったところ、ウォーターハンマーを7万回程度発生させた時点で、保護層12の表面に亀裂が生じた。
[Comparative Example 2]
A polyolefin pipe having a nominal diameter of 16 was used as a main pipe 11, and the outer peripheral surface thereof was covered with a protective layer 12 made of foamed polyurethane having a density of 21 kg / m 3 to form a piping material 1 having a length of 10 m. The outer diameter of the piping material 1 was set to 55 mm.
When the piping material 1 was subjected to a durability test in the same manner as described above, the surface of the protective layer 12 was cracked when the water hammer was generated about 70,000 times.

〔比較例3〕
呼び径16のポリオレフィン管を本管11とし、その外周面を密度9kg/mの発泡ポリウレタンからなる保護層12で被覆して、長さ10mの配管材1を形成した。配管材1の外径は55mmに設定した。
この配管材1を用いて前記と同様に配管材の耐久試験を行ったところ、ウォーターハンマーを9万回程度発生させた時点で、保護層12の表面に亀裂が生じた。
[Comparative Example 3]
A polyolefin pipe having a nominal diameter of 16 was used as a main pipe 11, and the outer peripheral surface thereof was covered with a protective layer 12 made of foamed polyurethane having a density of 9 kg / m 3 to form a piping material 1 having a length of 10 m. The outer diameter of the piping material 1 was set to 55 mm.
When the piping material 1 was subjected to a durability test in the same manner as described above, the surface of the protective layer 12 was cracked when the water hammer was generated about 90,000 times.

〔比較例4〕
呼び径10のポリオレフィン管を本管11とし、その外周面を密度20kg/mの発泡ポリウレタンからなる保護層12で被覆して、長さ10mの配管材1を形成した。配管材1の外径は50mmに設定した。
この配管材1を用いて前記と同様に配管材の耐久試験を行ったところ、ウォーターハンマーを7万回程度発生させた時点で、保護層12の表面に亀裂が生じた。
[Comparative Example 4]
A polyolefin pipe having a nominal diameter of 10 was used as a main pipe 11, and the outer peripheral surface thereof was covered with a protective layer 12 made of foamed polyurethane having a density of 20 kg / m 3 to form a piping material 1 having a length of 10 m. The outer diameter of the piping material 1 was set to 50 mm.
When the piping material 1 was subjected to a durability test in the same manner as described above, the surface of the protective layer 12 was cracked when the water hammer was generated about 70,000 times.

本発明の保護層付き配管材の断面図であり、(A)は保護層を圧縮した状態、(B)は保護層を復元させた状態である。It is sectional drawing of the piping material with a protective layer of this invention, (A) is the state which compressed the protective layer, (B) is the state which restored the protective layer. 本発明の保護層付き配管材の耐久試験条件を説明するための図であり、(A)は配管材の横断面、(B)は配管材の側面から見た図である。It is a figure for demonstrating the durability test conditions of the piping material with a protective layer of this invention, (A) is the cross section of a piping material, (B) is the figure seen from the side surface of the piping material. 比較例として従来の配管材の耐久試験条件を説明するための図であり、(A)は配管材の横断面、(B)は配管材の側面から見た図である。It is a figure for demonstrating the durability test conditions of the conventional piping material as a comparative example, (A) is the cross section of piping material, (B) is the figure seen from the side surface of piping material.

符号の説明Explanation of symbols

1 配管材、11 本管、12 保護層、13 フィルム、2 スラブ面、21 障害物




1 piping material, 11 main pipe, 12 protective layer, 13 film, 2 slab surface, 21 obstacle




Claims (4)

合成樹脂製の本管の外周面を保護層で被覆してなる保護層付き配管材において、
前記保護層はその密度が10kg/m〜20kg/mであって体積を圧縮可能な弾性材により形成されていることを特徴とする保護層付き配管材。
In the piping material with a protective layer formed by covering the outer peripheral surface of the main pipe made of synthetic resin with a protective layer
The protective layer is a protective layer with a pipe member, characterized in that it is formed of an elastic material capable of compressing the volume density thereof be 10kg / m 3 ~20kg / m 3 .
呼び径16以下の本管に対して、保護層が外径55mm以上の厚みに形成されてなることを特徴とする請求項1に記載の保護層付き配管材。   The piping material with a protective layer according to claim 1, wherein a protective layer is formed with a thickness of 55 mm or more for a main pipe having a nominal diameter of 16 or less. 保護層の表面を圧縮し且つプラスチックフィルムで被覆して、外径38mm以下に保護層を保持してなる請求項1又は2に記載の保護層付き配管材。   The piping material with a protective layer according to claim 1 or 2, wherein the surface of the protective layer is compressed and covered with a plastic film, and the protective layer is held at an outer diameter of 38 mm or less. プラスチックフィルムとして、厚さ50μm、収縮率69%の熱収縮性ポリエチレンテレフタレートからなるフィルムを用いた請求項3に記載の保護層付き配管材。




The piping material with a protective layer according to claim 3, wherein a film made of heat-shrinkable polyethylene terephthalate having a thickness of 50 μm and a shrinkage rate of 69% is used as the plastic film.




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