JPH08247377A - Covering pipe for asbestos cement pipe - Google Patents
Covering pipe for asbestos cement pipeInfo
- Publication number
- JPH08247377A JPH08247377A JP8074395A JP8074395A JPH08247377A JP H08247377 A JPH08247377 A JP H08247377A JP 8074395 A JP8074395 A JP 8074395A JP 8074395 A JP8074395 A JP 8074395A JP H08247377 A JPH08247377 A JP H08247377A
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- asbestos
- cement pipe
- covering
- asbestos cement
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/18—Appliances for use in repairing pipes
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、水道管等に用いられる
石綿セメント管の補強方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reinforcing an asbestos cement pipe used for a water pipe or the like.
【０００２】[0002]
【従来の技術】石綿セメント管は、軽量で加工性がよく
安価である反面、鉄管に比して強度が低く、破損し易い
という性質がある。特に、布設後多くの年数を経ると、
土壌や地下水等により、浸食されて管体の厚さが減少
し、強度が著しく低下することがある。2. Description of the Related Art Asbestos-cement pipes are lightweight, easy to process and inexpensive, but have a lower strength than iron pipes and are more susceptible to breakage. Especially after many years of installation,
It may be eroded by soil, groundwater, etc., and the thickness of the pipe may be reduced, resulting in a significant decrease in strength.
【０００３】このようになると、路面の振動あるいはガ
スや水道工事等により埋設されている石綿セメント管が
堀り出された際に、脆弱部が折損して溢水事故等を引起
こす原因となる。[0003] In such a case, when the asbestos cement pipe buried due to road surface vibration or gas or water works is dug out, the fragile portion is broken and causes a flood accident or the like.
【０００４】このような事故を未然に防止するために
は、管体の脆弱部を補強する必要があり、そのため、従
来は石綿セメント管に脆弱部が発見されたときには、直
管１本の布設替えを行ったり、他種の強靱な管と交換し
ており、その際には管の埋設箇所を広範囲に掘削した
り、新管を手配したりしなければならず、また、不断水
工事を行う場合には、工事が大規模となって多くの工数
や工期を要し、工事費も嵩む。In order to prevent such an accident, it is necessary to reinforce the fragile portion of the pipe body. Therefore, conventionally, when a fragile portion is found in the asbestos cement pipe, one straight pipe is laid. The pipes are replaced or replaced with other types of tough pipes.In that case, the buried part of the pipes must be excavated extensively and new pipes must be arranged. If it is carried out, the construction will be large-scaled, and many man-hours and construction periods will be required, and the construction cost will increase.
【０００５】そこで、既設の石綿セメント管をそのまま
使用し、この石綿セメント管の脆弱部または分岐管工事
箇所、さらには弁布設箇所近傍のみの補強を行う工法が
ある。Therefore, there is a construction method in which the existing asbestos cement pipe is used as it is, and reinforcement is made only in the fragile portion of the asbestos cement pipe or the branch pipe construction site, and further near the valve installation site.
【０００６】この工法は、例えば図８の特公昭５８−２
５９１９号公報に示されるように分岐管工事を行う箇所
の石綿セメント管０１の周囲を掘り起こし、掘削壕Ａを
形成するとともに、石綿セメント管０１の周囲を金属の
補助分割管０２で被覆し、石綿セメント管０１と金属の
補助分割管０２との間の空間にコンクリートミルクもし
くはエポキシ樹脂等の充填剤を充填するものである。This construction method is, for example, as shown in FIG.
As shown in Japanese Patent No. 5919, the asbestos-cement pipe 01 is dug up around a place where branch pipe construction is performed to form a trench A, and the asbestos-cement pipe 01 is covered with a metal auxiliary dividing pipe 02 to form asbestos. The space between the cement pipe 01 and the auxiliary metal split pipe 02 is filled with a filler such as concrete milk or epoxy resin.
【０００７】[0007]
【発明が解決しようとする課題】しかし、一般に石綿セ
メント管０１は経年変化によって浸食され、脆弱化して
いるため、図に示されるような大きな掘削壕Ａを掘り、
石綿セメント管０１を露出させると、石綿セメント管自
体、金属の補助分割管０２及び充填剤０３の重みによ
り、簡単に石綿セメント管０１が破壊されてしまう。However, since the asbestos cement pipe 01 is generally eroded and weakened due to secular change, a large excavation trench A as shown in the figure is dug,
When the asbestos-cement pipe 01 is exposed, the asbestos-cement pipe 01 is easily destroyed by the weight of the asbestos-cement pipe itself, the metal auxiliary split pipe 02, and the filler 03.
【０００８】さらに、金属製の補助分割管０２は強度確
保のため重量が大きく、掘削壕Ａ内で石綿セメント管０
１の下方に補助分割管０２を設置する作業には、作業員
が多数必要となり、さらに煩雑な作業を強いられること
になる。Further, the metal auxiliary dividing pipe 02 has a large weight for securing strength, and the asbestos cement pipe 0
A large number of workers are required for the work of installing the auxiliary split pipe 02 below 1, which complicates the work.
【０００９】本発明は、石綿セメント管の補強や修復に
当たり、金属管やコンクリート等の比重の大きい材料を
使用しない強力な石綿セメント管の被覆管を提供するこ
とを目的としている。It is an object of the present invention to provide a strong asbestos-cement pipe covering pipe that does not use a material having a large specific gravity such as a metal pipe or concrete when reinforcing or repairing an asbestos-cement pipe.
【００１０】[0010]
【課題を解決するための手段】上記課題を解決するた
め、本発明の石綿セメント管用被覆管は、既設の石綿セ
メント管の外周部に被冠して該既設の石綿セメント管を
補強もしくは修復する被覆管であり、この被覆管は石綿
セメント管より弾性率の大きいカーボン繊維強化プラス
チック（ＣＦＲＰ）で形成されているとともに、予め管
軸方向に複数個に分割されており、前記既設の石綿セメ
ント管の補強もしくは修復時等に管形状になるように接
合され、石綿セメント管の外周に近接もしくは当接して
一体に被覆できるようになっていることを特徴としてい
る。In order to solve the above problems, the cladding tube for asbestos-cement pipe of the present invention is capped on the outer peripheral portion of an existing asbestos-cement pipe to reinforce or restore the existing asbestos-cement pipe. The coated pipe is made of carbon fiber reinforced plastic (CFRP) having a higher elastic modulus than that of the asbestos cement pipe, and is divided into a plurality of pipes in the axial direction of the pipe. It is characterized in that it is joined so as to have a tubular shape when it is reinforced or repaired, and can be integrally covered by coming into contact with or abutting the outer circumference of the asbestos cement pipe.
【００１１】本発明の石綿セメント管用被覆管は、被覆
管の内径が石綿セメント管の外径とほぼ同径であり、前
記被覆管の内周面と前記石綿セメント管の外周面とにで
きる隙間距離が石綿セメント管の弾性限界応力における
外方伸び（歪）量以下にすることができる。In the asbestos-cement pipe covering pipe of the present invention, the inside diameter of the covering pipe is substantially the same as the outside diameter of the asbestos cement pipe, and a gap is formed between the inner peripheral surface of the covering pipe and the outer peripheral surface of the asbestos cement pipe. The distance can be made equal to or less than the amount of outward elongation (strain) at the elastic limit stress of the asbestos cement pipe.
【００１２】本発明の石綿セメント管用被覆管は、被覆
管の内径が石綿セメント管の外径とほぼ同径を有し、石
綿セメント管と被覆管とが接着樹脂剤で直接固定される
ようにすることができる。In the asbestos-cement pipe covering tube of the present invention, the inside diameter of the covering tube is almost the same as the outside diameter of the asbestos cement tube, and the asbestos-cement tube and the covering tube are directly fixed with an adhesive resin agent. can do.
【００１３】本発明の石綿セメント管用被覆管は、予め
石綿セメント管の外周面と被覆管の内周面の、少なくと
もいずれか一方に接着樹脂剤が塗布され、石綿セメント
管と被覆管とを工事現場において直接固定できるように
することができる。In the asbestos-cement pipe covering pipe of the present invention, an adhesive resin agent is applied to at least one of the outer peripheral surface of the asbestos cement pipe and the inner peripheral surface of the covering pipe in advance, and the asbestos-cement pipe and the covering pipe are constructed. It can be fixed directly in the field.
【００１４】本発明の石綿セメント管用被覆管は、被覆
管で石綿セメント管を被覆した後、被覆管の一部に形成
された充填口から石綿セメント管の外周面と被覆管の内
周面との隙間に接着樹脂剤を充填して固化させるように
することができる。The asbestos-cement pipe cladding tube of the present invention is obtained by coating an asbestos-cement tube with a cladding tube, and then forming an outer circumferential surface of the asbestos-cement tube and an inner circumferential surface of the cladding tube from a filling port formed in a part of the cladding tube. The gap can be filled with an adhesive resin agent and solidified.
【００１５】[0015]
【作用】石綿セメント管の外周を、石綿セメント管自体
の弾性率（ヤング率）よりも大きいカーボン繊維強化プ
ラスチックの被覆管で一体に被覆するため、鉄製の被覆
管とほぼ同じ強度を有するカーボン繊維強化プラスチッ
クの被覆管を使用した場合、被覆管の重量は鉄製のもの
に比べ約５分の１以下となり、軽量かつ強力な支持が可
能となる。また、前述のように被覆管の弾性率が石綿セ
メント管よりもはるかに大きいため、小さい断面二次モ
ーメント、言い換えれば肉薄被覆管が石綿セメント管の
外周面に近接もしくは当接し、内外からの応力に対して
石綿セメント管を強力に保護できることになる。[Function] Since the outer circumference of the asbestos-cement pipe is integrally covered with the carbon-fiber-reinforced plastic coating pipe having a larger elastic modulus (Young's modulus) than the asbestos-cement pipe itself, carbon fiber having almost the same strength as the iron-made coating pipe. When a reinforced plastic cladding tube is used, the weight of the cladding tube is about one-fifth or less that of an iron-made cladding tube, which enables lightweight and strong support. In addition, as described above, the elastic modulus of the cladding is much higher than that of the asbestos-cement pipe, so the second moment of area is small, in other words, the thin-walled cladding comes close to or abuts the outer surface of the asbestos-cement pipe, causing stress from inside and outside. As a result, the asbestos cement pipe can be strongly protected.
【００１６】被覆管の内周面と石綿セメント管の外周面
との隙間距離が石綿セメント管の弾性限界応力における
外方伸び（歪）量以下に設定されていると、例えば被覆
管の外からの荷重はその初期もしくは低荷重時には被覆
管でその荷重が支えられるため、石綿セメント管にはほ
とんど荷重が加わらず、また石綿セメント管内方からの
水等の内圧が石綿セメント管に加わっても石綿セメント
管の弾性限界応力に到達以前に石綿セメント管が高強度
の被覆管に当接して、石綿セメント管の伸びが強力に抑
えられるため、内圧に対しても十分な強度を有すること
になる。If the gap distance between the inner peripheral surface of the cladding tube and the outer peripheral surface of the asbestos cement tube is set to be less than the amount of outward elongation (strain) at the elastic limit stress of the asbestos cement tube, for example, from the outside of the cladding tube. The load of is supported by the cladding pipe at the initial or low load, so almost no load is applied to the asbestos cement pipe, and even if internal pressure such as water from inside the asbestos cement pipe is applied to the asbestos cement pipe. Before the elastic limit stress of the cement pipe is reached, the asbestos cement pipe comes into contact with the high-strength covering pipe, and the elongation of the asbestos cement pipe is strongly suppressed, so that the asbestos cement pipe has sufficient strength against internal pressure.
【００１７】石綿セメント管と被覆管とを接着樹脂剤で
固定すると、石綿セメント管と被覆管の両管で外荷重、
管内圧に十分対抗できるため、石綿セメント管の見かけ
上の弾性限界応力が飛躍的に延びる。When the asbestos cement pipe and the covering pipe are fixed with an adhesive resin agent, an external load is applied to both the asbestos cement pipe and the covering pipe,
Since the pressure inside the pipe can be sufficiently counteracted, the apparent elastic limit stress of the asbestos-cement pipe dramatically increases.
【００１８】予め石綿セメント管の外周面と被覆管の内
周面の少なくともいずれか一方に接着樹脂剤が塗布され
ていると、被覆管がカーボン繊維強化プラスチックであ
る軽量さと相俟って、分割された一部の被覆管を下方か
らでも容易に石綿セメント管に止着できる。When the adhesive resin agent is applied to at least one of the outer peripheral surface of the asbestos-cement pipe and the inner peripheral surface of the covering pipe in advance, the covering pipe is divided in consideration of the light weight of the carbon fiber reinforced plastic. It is possible to easily fasten a part of the coated pipe to the asbestos cement pipe even from below.
【００１９】被覆管を石綿セメント管に被覆した後、所
定の充填口から石綿セメント管と被覆管との隙間に充填
するようにすれば、石綿セメント管の外径が被覆管の内
径よりも多少小さい場合でも、被覆管と石綿セメント管
とを強力に接着する程度の十分な接着層を形成できる。If the asbestos-cement pipe is coated with the covering pipe and then the gap between the asbestos-cement pipe and the covering pipe is filled from a predetermined filling port, the outer diameter of the asbestos-cement pipe is slightly larger than the inner diameter of the covering pipe. Even if it is small, it is possible to form an adhesive layer sufficient to strongly bond the cladding pipe and the asbestos cement pipe.
【００２０】[0020]
【実施例】以下、本発明の実施例を図面とともに説明す
ると、図１、図２には本発明の第１実施例が示され、１
はポルトランドセメントと石綿繊維（アスベスト）とか
らなる石綿セメント管（ＡＣ）であり、既設の水道管と
して通常地中に埋設されている。この石綿セメント管１
は前述したように経年変化により浸食され脆弱化してい
るため、脆弱部の補強が必要であるとともに、この石綿
セメント管から分岐管を取り出したり、開閉弁、切換弁
等を新たに布設することも行われる。このため、これら
補強、補修さらには水道工事を行うためには、その周囲
の掘削壕を掘り、局部的かつ一時的に石綿セメント管１
が露出される。Embodiments of the present invention will now be described with reference to the drawings. First Embodiment FIGS. 1 and 2 show the first embodiment of the present invention.
Is an asbestos cement pipe (AC) made of Portland cement and asbestos fiber (asbestos), and is normally buried in the ground as an existing water pipe. This asbestos cement pipe 1
As mentioned above, since it has been eroded and fragile due to aging, it is necessary to reinforce the fragile part, and it is also possible to take out a branch pipe from this asbestos cement pipe and newly install an on-off valve, a switching valve, etc. Done. Therefore, in order to carry out these reinforcements, repairs, and waterworks, the surrounding excavation trench is dug, and the asbestos-cement pipe 1 is locally and temporarily
Is exposed.
【００２１】２は、カーボン繊維強化プラスチック（Ｃ
ＦＲＰ）により作られ、極めて弾性率（ヤング率）の高
い被覆管であり、石綿セメント管１に上下もしくは左右
から被冠できるように２分割された分割被覆管２’、
２’から構成されている。なお、この実施例では２分割
されているが、石綿セメント管の径に応じて３分割、４
分割も可能である。2 is a carbon fiber reinforced plastic (C
It is a cladding tube made of FRP) and having a very high elastic modulus (Young's modulus), and is a split cladding tube 2'that is split into two sections so that the asbestos cement tube 1 can be crowned from above or below or from the left and right.
It consists of 2 '. It should be noted that although it is divided into two in this embodiment, it is divided into three according to the diameter of the asbestos cement pipe, 4
It can be divided.
【００２２】これら分割被覆管２’には、被覆管２を連
続接続するために、外部にフランジのような突出部を形
成させずに重合接着できるように、またその以前に被覆
完了した被覆管２の外周部の一端外周部に重合接着でき
るように、分割被覆管２’の内径よりも分割被覆管２’
の肉厚分だけ内径の大きい重合片３、４が突設されてい
る。なお、この重合片３は接着部を広く取れる機能が有
り、分割被覆管２’同士の接合に極めて効果的である。These divided coating pipes 2 ′ can be polymerized and bonded without continuously forming protrusions such as flanges in order to continuously connect the coating pipes 2, and the coating pipes which have been coated before that time. 2 so that one end of the outer peripheral portion of 2 can be polymer-bonded to the outer peripheral portion of the outer peripheral portion,
The overlapped pieces 3 and 4 having an inner diameter corresponding to the thickness of 3 are projected. The polymerized piece 3 has a function of widely taking an adhesive portion, and is extremely effective for joining the divided covering tubes 2 '.
【００２３】本発明における分割被覆管２’は、カーボ
ン繊維強化プラスチックでできているため、鉄の被覆管
と同等の強度であってもその重量は５分の１以下程度
（カーボンの選択によっては１０分の１も可能である）
と極めて軽量なため、例えば１人の作業者が掘削壕の下
方から一枚の分割被覆管２’を支え、他の作業者が上方
から一枚の分割被覆管２’を下降させ、６で示す接着樹
脂が適宜塗布された面を他の接着樹脂塗布面に押し当て
ることによって、順次容易に石綿セメント管１に被覆管
２を被覆できることになる。Since the split cladding tube 2'in the present invention is made of carbon fiber reinforced plastic, its weight is about one-fifth or less (depending on carbon selection, even if it has the same strength as the iron cladding tube. 1/10 is possible)
Since it is extremely lightweight, for example, one worker supports one split cladding tube 2'from below the excavation pit and another worker lowers one split cladding tube 2'from above, By pressing the surface to which the adhesive resin shown is appropriately applied to the other adhesive resin-coated surface, the asbestos cement pipe 1 can be easily covered with the coating pipe 2 in sequence.
【００２４】ここで、５は接着剤のみでは接合強度が不
十分な場合に、対向する重合片３を利用して両分割被覆
片２’、２’同士を連結するネジあるいはリベットであ
る。Here, 5 is a screw or a rivet for connecting the two divided covering pieces 2 ', 2'using the facing overlapping piece 3 when the bonding strength is insufficient with only the adhesive.
【００２５】またこの実施例では、石綿セメント管１の
外径と被覆管２の内径とは若干のゆとりが許容されるも
のとしてほぼ同径になっており、図２に示すように被覆
管２の内面が石綿セメント管１の外周面に近接もしくは
当接して一体に被覆できるようになっている。Further, in this embodiment, the outer diameter of the asbestos-cement pipe 1 and the inner diameter of the covering pipe 2 are substantially the same diameter to allow a slight allowance, and as shown in FIG. The inner surface of the asbestos-cement pipe 1 is close to or in contact with the outer peripheral surface of the asbestos-cement pipe 1 so that they can be integrally coated.
【００２６】ここで、被覆管２の内周面と石綿セメント
管１の外周面との隙間距離ｌは可能な限り小さい方がよ
いが、石綿セメント管１の弾性限界応力における外方伸
び（歪）量以下にすることが重要である。このような設
定が可能であれば、被覆管の外からの荷重はその初期も
しくは低荷重時には被覆管２でその荷重が支えられるた
め、石綿セメント管１にはほとんど荷重が加わらず、ま
た石綿セメント管１内方からの水等の内圧が石綿セメン
ト管１に加わっても石綿セメント管１の弾性限界応力に
到達以前に石綿セメント管１が高強度の被覆管に当接し
て、石綿セメント管１の伸びが強力に抑えられるため、
内圧に対しても十分な強度を有することになる。このよ
うに、この被覆管２で補強された管に加わる内外の力に
対して石綿セメント管１の破壊を十分防止することがで
きる。Here, the gap distance l between the inner peripheral surface of the cladding tube 2 and the outer peripheral surface of the asbestos cement pipe 1 is preferably as small as possible, but the outward elongation (strain) at the elastic limit stress of the asbestos cement pipe 1 is preferable. ) It is important to keep the amount below. If such a setting is possible, since the load from the outside of the cladding pipe is supported by the cladding pipe 2 at the initial stage or at a low load, almost no load is applied to the asbestos cement pipe 1, and the asbestos cement is Even if internal pressure such as water from the inside of the pipe 1 is applied to the asbestos cement pipe 1, the asbestos cement pipe 1 contacts the high-strength cladding pipe before reaching the elastic limit stress of the asbestos cement pipe 1, Because the growth of is strongly suppressed,
It also has sufficient strength against internal pressure. In this way, it is possible to sufficiently prevent the asbestos-cement pipe 1 from being broken against internal and external forces applied to the pipe reinforced by the covering pipe 2.
【００２７】図３、図４には本発明の第２実施例が示さ
れ、第１実施例と相違する点は、分割被覆管２’内周
面、石綿セメント管１の外周面、重合片３、４内面、そ
して隣接する被覆管２の端部等、適宜選択された所定の
箇所に接着樹脂剤６を前もって塗布しておき、石綿セメ
ント管１に直接被覆管２を接着被覆する点である。FIGS. 3 and 4 show a second embodiment of the present invention. The difference from the first embodiment is that the inner surface of the split covering tube 2 ', the outer surface of the asbestos cement tube 1, the polymerized piece. In that the adhesive resin agent 6 is applied in advance to predetermined positions appropriately selected, such as the inner surfaces 3 and 4 and the ends of the adjacent covering pipes 2, and the covering pipe 2 is directly adhered to the asbestos cement pipe 1. is there.
【００２８】この場合も、分割被覆管２’の重量が極め
て軽量なため、作業者はさらに少人数で順次容易に石綿
セメント管１に被覆管２を被覆することができる。In this case as well, since the weight of the divided covering pipe 2'is extremely light, an operator can easily cover the asbestos cement pipe 1 with the covering pipe 2 in sequence in a smaller number.
【００２９】このような接着被覆を行うことにより、石
綿セメント管１と被覆管２とを接着する接着樹脂層は極
めて薄いものとなり、言い換えれば石綿セメント管１に
被覆管２が極めて接近してそれぞれが一体化できるた
め、石綿セメント管１と被覆管２の両管で外荷重、管内
圧に十分対抗でき、石綿セメント管１の見かけ上の弾性
限界応力が飛躍的に延びることになる。By performing such an adhesive coating, the adhesive resin layer for adhering the asbestos cement pipe 1 and the coating pipe 2 becomes extremely thin. In other words, the coating pipe 2 comes very close to the asbestos cement pipe 1 and respectively. Since the asbestos cement pipe 1 and the covering pipe 2 can sufficiently counteract the external load and the pipe internal pressure, the apparent elastic limit stress of the asbestos cement pipe 1 is dramatically extended.
【００３０】またこの実施例において、石綿セメント管
１が湿気を帯びている場合等は、石綿セメント管１の回
りに薄い防水シート（図示せず）を巻回してその上に接
着樹脂剤６を塗布することも可能である。In this embodiment, when the asbestos-cement pipe 1 is humid, a thin waterproof sheet (not shown) is wound around the asbestos-cement pipe 1 and the adhesive resin agent 6 is applied thereon. It is also possible to apply.
【００３１】図５、図６には本発明の第３実施例が示さ
れ、石綿セメント管１が経年変化によって小径になって
おり、前実施例のような接着樹脂剤の塗布で間に合わな
いような場合等、被覆管２の所定位置に開口された充填
口７を利用し、適宜他の開口または被覆管の端部から空
気を抜きながらエポキシ系、ウレタン系、またはアクリ
ル系等の接着樹脂剤８を適宜流し込むことができる。FIG. 5 and FIG. 6 show a third embodiment of the present invention, in which the asbestos cement pipe 1 has a small diameter due to aging, so that the application of the adhesive resin agent as in the previous embodiment will not make it in time. In such a case, an adhesive resin agent such as an epoxy-based, urethane-based, or acrylic-based adhesive resin agent is used by appropriately using a filling port 7 opened at a predetermined position of the coating tube 2 while bleeding air from another opening or the end of the coating tube. 8 can be poured in appropriately.
【００３２】図７は、石綿セメント管（ＡＣ）、グラス
繊維強化プラスチック（ＧＦＲＰ）、そしてカーボン繊
維強化プラスチック（ＣＦＲＰ）の材料特性としての弾
性率（ヤング率）の傾向を表わしたグラフであり、実験
等によれば石綿セメント管（ＡＣ）とグラス繊維強化プ
ラスチック（ＧＦＲＰ）とはこの弾性率に大きな相違が
なく、また、グラス繊維強化プラスチックではそれ以上
の極端な弾性率を得ることはできない。これに比べカー
ボン繊維強化プラスチック（ＣＦＲＰ）は、ＡＣ、ＧＦ
ＲＰに比較して約８倍以上の弾性率のものが製造可能で
ある。FIG. 7 is a graph showing the tendency of elastic modulus (Young's modulus) as a material characteristic of asbestos-cement pipe (AC), glass fiber reinforced plastic (GFRP), and carbon fiber reinforced plastic (CFRP). According to experiments and the like, there is no great difference in the elastic modulus between the asbestos cement pipe (AC) and the glass fiber reinforced plastic (GFRP), and the glass fiber reinforced plastic cannot obtain a further extreme elastic modulus. Compared with this, carbon fiber reinforced plastic (CFRP) is AC, GF
It is possible to manufacture a material having an elastic modulus of about 8 times or more that of RP.
【００３３】ここで一般に材料の曲げ力としてＰとその
たわみ量との関係は、 ｌ／Ｌ0 3＝Ｐ／（Ｅ・Ｉ） （ｌ：たわみ量、Ｌ0：支点間の距離、Ｅ：弾性係数、
Ｉ：断面二次モーメント）の式で表わされ、材料が複合
材の場合は ｌ／Ｌ0 3＝Ｐ／（Ｅ1Ｉ1＋Ｅ2Ｉ2＋…） で表わされることからも明らかなように、石綿セメント
管をその弾性率がほぼ同じグラス繊維強化プラスチック
で直接補強することになると、石綿セメント管のたわみ
量を減らすためにグラス繊維強化プラスチックを使用し
たにもかかわらず、単純に石綿セメント管自体の厚みを
増したことにしかならず、その分全重量が増加し、露出
された石綿セメント管にこの重量による破壊力を及ぼし
かねない。また、この方法であると分岐管工事や弁体の
布設工事においてボーラー等によって切断される被覆管
部分の厚みが増加するため、工事に要する時間やコスト
も多大なものとなる。Generally, the relationship between P as the bending force of a material and its deflection amount is as follows: 1 / L 0 3 = P / (E · I) (l: deflection amount, L 0 : distance between fulcrums, E: Elastic modulus,
I: second moment of area), and when the material is a composite material, it is expressed as follows: l / L 0 3 = P / (E 1 I 1 + E 2 I 2 + ...) In addition, when asbestos cement pipes are directly reinforced with glass fiber reinforced plastics that have almost the same elastic modulus, even though glass fiber reinforced plastics are used to reduce the amount of bending of asbestos cement pipes, asbestos cement pipes are simply used. Only by increasing the thickness of the pipe itself, the total weight increases by that amount, and the exposed asbestos cement pipe may exert a destructive force due to this weight. Further, with this method, the thickness of the covering pipe portion cut by a borer or the like in the branch pipe construction and the valve body laying construction increases, so that the time and cost required for the construction also become enormous.
【００３４】本発明では、石綿セメント管より軽量かつ
高い弾性率を有するカーボン繊維強化プラスチックによ
りこの石綿セメント管を被覆するので、鉄製はもとより
グラス繊維強化プラスチックでも到達できない極めて効
果的な補強が可能となる。特に図８の従来例にも示され
るように、鉄製の被覆管を使用した場合、分岐管工事等
においてこの鉄の被覆管の切断を避け、脆弱化した石綿
セメント管を直接切断するため、工事には極めて慎重さ
が要求されるとともに、またあえて全体を鉄の被覆管で
覆い、この金属の被覆管をもボーラー等で同時に切断す
るとなると工事時間が多大なものとなる。この点、本発
明はカーボン繊維強化プラスチックの被覆管を採用する
ため、切断が極めて容易なものとなり、上記のような管
工事に極めて適している。In the present invention, since this asbestos cement pipe is covered with carbon fiber reinforced plastic which is lighter in weight and higher in elastic modulus than the asbestos cement pipe, it is possible to achieve extremely effective reinforcement that cannot be achieved by iron or glass fiber reinforced plastic. Become. In particular, as shown in the conventional example of FIG. 8, when an iron-made cladding pipe is used, the cutting of the iron-clad pipe is avoided in branch pipe construction, etc., and the weakened asbestos cement pipe is directly cut. Requires a great deal of caution, and if the whole body is covered with an iron clad tube and this metal clad tube is cut at the same time with a boring machine, the construction time will be too long. In this respect, since the present invention employs the carbon fiber reinforced plastic coating pipe, it is extremely easy to cut and is extremely suitable for the above pipe construction.
【００３５】以上、本発明の実施例を図面により説明し
てきたが、具体的な構成はこれら実施例に限られるもの
ではなく、本発明の要旨を逸脱しない範囲における変更
や追加があっても本発明に含まれる。The embodiments of the present invention have been described above with reference to the drawings. However, the specific configuration is not limited to these embodiments, and even if there are changes and additions within the scope not departing from the gist of the present invention, the present invention is not limited. Included in the invention.
【００３６】例えば、本発明では被覆管が管軸方向に分
割されていると表現されているが、複数の分割被覆管が
石綿セメント管に周囲から取付けられればよく、軸に対
して傾斜する方向も含むことは明らかである。For example, in the present invention, it is described that the cladding tube is divided in the axial direction of the tube, but it is sufficient that a plurality of divided cladding tubes are attached to the asbestos cement tube from the periphery, and the direction in which the cladding tube is inclined with respect to the axis. It is clear that it also includes.
【００３７】[0037]
【発明の効果】以上説明してきたように本発明にあって
は、次に記載する効果が得られる。As described above, according to the present invention, the following effects can be obtained.
【００３８】（ａ）石綿セメント管の外周を、石綿セメ
ント管自体の弾性率（ヤング率）よりも大きいカーボン
繊維強化プラスチックの被覆管で一体に被覆するため、
鉄製の被覆管とほぼ同じ強度を有するカーボン繊維強化
プラスチックの被覆管を使用した場合、被覆管の重量は
鉄製のものに比べ約５分の１以下となり、軽量かつ強力
な支持が可能となる。また、前述のように被覆管の弾性
率が石綿セメント管よりもはるかに大きいため、小さい
断面二次モーメント、言い換えれば肉薄被覆管が石綿セ
メント管の外周面に近接もしくは当接し、内外からの応
力に対して石綿セメント管を強力に保護できることにな
る。(A) Since the outer circumference of the asbestos cement pipe is integrally covered with a carbon fiber reinforced plastic coating pipe having a larger elastic modulus (Young's modulus) than the asbestos cement pipe itself,
When a carbon fiber reinforced plastic cladding tube having about the same strength as an iron cladding tube is used, the cladding tube weight is about one-fifth or less of that of an iron cladding tube, which enables lightweight and strong support. In addition, as described above, the elastic modulus of the cladding is much higher than that of the asbestos-cement pipe, so the second moment of area is small, in other words, the thin-walled cladding comes close to or abuts the outer surface of the asbestos-cement pipe, causing stress from inside and outside. As a result, the asbestos cement pipe can be strongly protected.
【００３９】（ｂ）被覆管の内周面と石綿セメント管の
外周面との隙間距離が石綿セメント管の弾性限界応力に
おける外方伸び（歪）量以下に設定されていると、例え
ば被覆管の外からの荷重はその初期もしくは低荷重時に
は被覆管でその荷重が支えられるため、石綿セメント管
にはほとんど荷重が加わらず、また石綿セメント管内方
からの水等の内圧が石綿セメント管に加わっても石綿セ
メント管の弾性限界応力に到達以前に石綿セメント管が
高強度の被覆管に当接して、石綿セメント管の伸びが強
力に抑えられるため、内圧に対しても十分な強度を有す
ることになる。(B) If the gap distance between the inner peripheral surface of the cladding tube and the outer peripheral surface of the asbestos-cement pipe is set to be equal to or less than the outward elongation (strain) amount at the elastic limit stress of the asbestos-cement pipe, for example, the cladding pipe The load from the outside of the asbestos cement pipe is hardly applied because the load is supported by the cladding pipe at the initial or low load, and the internal pressure of water etc. from the inside of the asbestos cement pipe is applied to the asbestos cement pipe. Even if the asbestos cement pipe comes into contact with the high-strength cladding pipe before reaching the elastic limit stress of the asbestos cement pipe, the elongation of the asbestos cement pipe is strongly suppressed, so it must have sufficient strength against internal pressure. become.
【００４０】（ｃ）石綿セメント管と被覆管とを接着樹
脂剤で固定すると、石綿セメント管と被覆管の両管で外
荷重、管内圧に十分対抗できるため、石綿セメント管の
見かけ上の弾性限界応力が飛躍的に延びる。(C) When the asbestos-cement pipe and the covering pipe are fixed with an adhesive resin agent, both the asbestos-cement pipe and the covering pipe can sufficiently resist external load and internal pressure, so that the asbestos-cement pipe has an apparent elasticity. The critical stress increases dramatically.
【００４１】（ｄ）予め石綿セメント管の外周面と被覆
管の内周面の少なくともいずれか一方に接着樹脂剤が塗
布されていると、被覆管がカーボン繊維強化プラスチッ
クである軽量さと相俟って、分割された一部の被覆管を
下方からでも容易に石綿セメント管に止着できる。(D) When the adhesive resin agent is applied to at least one of the outer peripheral surface of the asbestos-cement pipe and the inner peripheral surface of the covering pipe in advance, the covering pipe is made of carbon fiber reinforced plastic, which is light in weight. Thus, a part of the divided covering pipe can be easily fixed to the asbestos cement pipe even from below.
【００４２】（ｅ）被覆管を石綿セメント管に被覆した
後、所定の充填口から石綿セメント管と被覆管との隙間
に充填するようにすれば、石綿セメント管の外径が被覆
管の内径よりも多少小さい場合でも、被覆管と石綿セメ
ント管とを強力に接着する程度の十分な接着層を形成で
きる。(E) If the asbestos-cement pipe is coated with the covering pipe and then the gap between the asbestos-cement pipe and the covering pipe is filled through a predetermined filling port, the outer diameter of the asbestos-cement pipe is the inner diameter of the covering pipe. Even if it is a little smaller than the above, it is possible to form a sufficient adhesive layer for strongly adhering the covering pipe and the asbestos cement pipe.
【００４３】[0043]
【図１】本発明第１実施例の被覆管の装着工程図であ
る。FIG. 1 is a diagram illustrating a mounting process of a cladding tube according to a first embodiment of the present invention.
【図２】図１のＡ−Ａ断面図である。FIG. 2 is a sectional view taken along line AA of FIG.
【図３】本発明第２実施例の被覆管の装着工程図であ
る。FIG. 3 is a mounting process diagram of a cladding tube according to a second embodiment of the present invention.
【図４】図３のＡ−Ａ断面図である。FIG. 4 is a sectional view taken along line AA of FIG. 3;
【図５】本発明第３実施例の被覆管の装着工程図であ
る。FIG. 5 is a diagram illustrating a mounting process of a cladding tube according to a third embodiment of the present invention.
【図６】図５のＡ−Ａ断面図である。6 is a sectional view taken along line AA of FIG.
【図７】石綿セメント管、グラス繊維強化プラスチック
管、そしてカーボン繊維強化プラスチック管の弾性率を
表わすグラフである。FIG. 7 is a graph showing the elastic moduli of asbestos-cement pipes, glass fiber reinforced plastic pipes, and carbon fiber reinforced plastic pipes.
【図８】従来の石綿セメント管の補強時の一部断面図で
ある。FIG. 8 is a partial cross-sectional view of a conventional asbestos-cement pipe during reinforcement.
１ 石綿セメント管 ２ 被覆管 ２’ 分割被覆管 ３ 重合片 ４ 重合片 ５ ネジまたはリベット ６ 接着樹脂剤 ７ 充填口 ８ 接着樹脂剤 1 Asbestos cement pipe 2 Coated pipe 2'Split pipe 3 Polymerized piece 4 Polymerized piece 5 Screw or rivet 6 Adhesive resin agent 7 Filling port 8 Adhesive resin agent
フロントページの続き (72)発明者 石田 良一 東京都港区新橋２丁目16番の１の701号ニ ュー新橋ビル706号室 コスモ工機株式会 社内 (72)発明者 斎藤 俊雄 東京都稲城市坂浜2283 スーパーレジン工 業株式会社内Front page continuation (72) Ryoichi Ishida Inventor Ryoichi 2-16-16 Shimbashi, Minato-ku, Tokyo No. 701 No. 701 New Shimbashi Building Room 706 Cosmo Koki Co., Ltd. (72) Inventor Toshio Saito 2283 Sakahama, Inagi, Tokyo Super Resin Industry Co., Ltd.
Claims (5)
て該既設の石綿セメント管を補強もしくは修復する被覆
管であり、この被覆管は石綿セメント管より弾性率の大
きいカーボン繊維強化プラスチック（ＣＦＲＰ）で形成
されているとともに、予め管軸方向に複数個に分割され
ており、前記既設の石綿セメント管の補強もしくは修復
時等に管形状になるように接合され、石綿セメント管の
外周に近接もしくは当接して一体に被覆できるようにな
っている既設の石綿セメント管用被覆管。1. A covering pipe for reinforcing or repairing an existing asbestos cement pipe by covering the outer peripheral portion of the existing asbestos cement pipe, and the covering pipe is a carbon fiber reinforced plastic having a higher elastic modulus than that of the asbestos cement pipe. The outer circumference of the asbestos-cement pipe is made of (CFRP) and is divided into a plurality of parts in the pipe axis direction in advance, and joined so as to have a tubular shape when reinforcing or repairing the existing asbestos-cement pipe. An existing asbestos-cement pipe cladding pipe that can be coated in close proximity to or in contact with.
ほぼ同径であり、前記被覆管の内周面と前記石綿セメン
ト管の外周面とにできる隙間距離が石綿セメント管の弾
性限界応力における外方伸び（歪）量以下になっている
請求項１に記載の石綿セメント管用被覆管。2. The inner diameter of the covering pipe is substantially the same as the outer diameter of the asbestos cement pipe, and the gap distance formed between the inner peripheral surface of the covering pipe and the outer peripheral surface of the asbestos cement pipe is the elastic limit of the asbestos cement pipe. The asbestos-cement pipe cladding tube according to claim 1, which has an outward elongation (strain) amount of a stress or less.
ほぼ同径を有し、石綿セメント管と被覆管とが接着樹脂
剤で直接固定されるようになっている請求項１に記載の
石綿セメント管用被覆管。3. The asbestos cement pipe and the covering pipe are directly fixed with an adhesive resin agent, wherein the inside diameter of the covering pipe is substantially the same as the outside diameter of the asbestos cement pipe. Asbestos cement pipe cladding.
内周面の、少なくともいずれか一方に接着樹脂剤が塗布
され、石綿セメント管と被覆管とを工事現場において直
接固定できるようになっている請求項３に記載の石綿セ
メント管用被覆管。4. The asbestos cement pipe and the covering pipe can be directly fixed at a construction site by applying an adhesive resin agent to at least one of the outer peripheral surface of the asbestos cement pipe and the inner peripheral surface of the covering pipe in advance. The covering pipe for asbestos cement pipe according to claim 3.
被覆管の一部に形成された充填口から石綿セメント管の
外周面と被覆管の内周面との隙間に接着樹脂剤を充填し
て固化させるようにした請求項３に記載の石綿セメント
管用被覆管。5. After coating the asbestos cement pipe with the coating pipe,
The asbestos-cement pipe according to claim 3, wherein an adhesive resin agent is filled into a gap between an outer peripheral surface of the asbestos-cement pipe and an inner peripheral surface of the coating pipe from a filling port formed in a part of the coating pipe to solidify the adhesive resin agent. Cladding tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08074395A JP3540425B2 (en) | 1995-03-13 | 1995-03-13 | Coated pipe for asbestos cement pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08074395A JP3540425B2 (en) | 1995-03-13 | 1995-03-13 | Coated pipe for asbestos cement pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08247377A true JPH08247377A (en) | 1996-09-27 |
| JP3540425B2 JP3540425B2 (en) | 2004-07-07 |
Family
ID=13726889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP08074395A Expired - Fee Related JP3540425B2 (en) | 1995-03-13 | 1995-03-13 | Coated pipe for asbestos cement pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3540425B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019206983A (en) * | 2018-05-28 | 2019-12-05 | 東京瓦斯株式会社 | Pipe conduit repair method and pipe conduit repair system |
-
1995
- 1995-03-13 JP JP08074395A patent/JP3540425B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019206983A (en) * | 2018-05-28 | 2019-12-05 | 東京瓦斯株式会社 | Pipe conduit repair method and pipe conduit repair system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3540425B2 (en) | 2004-07-07 |
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