JPH11115051A - Repairing method of existing pipe - Google Patents
Repairing method of existing pipeInfo
- Publication number
- JPH11115051A JPH11115051A JP9276979A JP27697997A JPH11115051A JP H11115051 A JPH11115051 A JP H11115051A JP 9276979 A JP9276979 A JP 9276979A JP 27697997 A JP27697997 A JP 27697997A JP H11115051 A JPH11115051 A JP H11115051A
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- packer
- wrinkles
- state
- expansion
- 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
Landscapes
- Lining Or Joining Of Plastics Or The Like (AREA)
- Pipe Accessories (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は既設管の補修工法、
詳しくは補修材としてプラスチック製硬質乃至半硬質パ
イプを用いる補修工法に関する。The present invention relates to a method for repairing an existing pipe,
More specifically, the present invention relates to a repair method using a plastic hard or semi-hard pipe as a repair material.
【０００２】[0002]
【従来の技術】従来、既設管の補修工法として、管内に
プラスチック製硬質パイプを有効外径を減少させた状態
で挿入し、しかる後、該パイプを内部からの加熱加圧に
より膨張復元させ、管内面に被着させ内張りする工法が
提案されている（例えば特開昭６４−４２２２０号公報
参照）。2. Description of the Related Art Conventionally, as a repairing method for an existing pipe, a plastic hard pipe is inserted into the pipe with a reduced effective outer diameter, and then the pipe is expanded and restored by heating and pressurizing from inside. There has been proposed a method of attaching a pipe to the inner surface of a pipe and lining the pipe (for example, see JP-A-64-42220).
【０００３】[0003]
【発明が解決しようとする課題】上記補修工法によれば
管内に硬質パイプからなる内張りを形成でき、信頼性の
高い補修が可能になるが、上記パイプの膨張復元の不均
一乃至不完全により皺が発生することがある。特に、既
設管の管曲がり部に於いては、外側領域と内側領域とで
は曲率半径が異なり、曲率半径の大きい外側領域ではパ
イプは拡張傾向となるので特に問題はないが、曲率半径
の小さい内側領域では圧縮傾向となるので皺が発生する
恐れがある。このような傾向は上記パイプとして既設管
の内径と略々同外径のポリエチレンパイプを用いる場合
に顕著である。内張りに皺が発生すると管路の有効開口
面積が減少し管詰まりを発生させる原因になったり或い
は早期摩損原因になるなど内張りの品質を低下させ好ま
しくない。According to the above-mentioned repairing method, a lining made of a hard pipe can be formed in the pipe, and the repair can be performed with high reliability. May occur. In particular, in the bent portion of the existing pipe, the radius of curvature is different between the outer region and the inner region, and the pipe tends to expand in the outer region having a large radius of curvature. There is a possibility that wrinkles may occur due to the tendency of compression in the region. Such a tendency is remarkable when a polyethylene pipe having substantially the same outer diameter as the existing pipe is used as the pipe. If wrinkles occur in the lining, the quality of the lining deteriorates, such as reducing the effective opening area of the pipeline and causing clogging of the pipe or causing early wear, which is not preferable.
【０００４】本発明は皺のない高品質の内張りを形成で
きる既設管の補修工法を提供することを目的としてなさ
れたものである。An object of the present invention is to provide a method for repairing an existing pipe capable of forming a high-quality lining without wrinkles.
【０００５】[0005]
【課題を解決するための手段】本発明者等は管曲がり部
に於いて発生するパイプ皺の消去法につき鋭意研究を重
ねる過程で、パイプを加熱軟化状態に保持した状態で例
えばパイプ内のスチーム圧力を１．２〜１．５kg／cm2
程度の高圧力に上げ、この高圧力により皺を押し延ばし
消去させることを試みた。ところがこのよう高圧力をか
ける方法では図８に概略的に示すように皺ａが立ち上が
ったままで押し潰されて行き、皺が消去しないことが判
明した。本発明者等は更に鋭意研究を重ねた結果、管半
径方向に拡縮自在な押圧部材を適用してパイプ皺を加熱
軟化状態の下に押し延ばすようにすれば、皺をうまく消
去できることを見出し、ここに本発明を完成するに至っ
たものである。The inventors of the present invention have conducted intensive studies on a method of eliminating pipe wrinkles generated in a bent portion of a pipe. Pressure 1.2-1.5kg / cm 2
The pressure was increased to a high level, and an attempt was made to push and eliminate wrinkles by the high pressure. However, it has been found that in the method of applying a high pressure, wrinkles a are squashed while standing up as shown schematically in FIG. 8, and the wrinkles are not erased. The present inventors have further studied diligently, and have found that if a pipe wrinkle is applied under a heat-softened state by applying a pressing member that is expandable and contractible in the pipe radial direction, the wrinkles can be eliminated well, Here, the present invention has been completed.
【０００６】即ち、本発明は、補修材として、既設管の
内径より若干小さい外径のプラスチック製硬質乃至半硬
質パイプを用い、該パイプを有効外径が減ずるように変
形加工した状態で既設管内に挿入した後に、該パイプを
内部よりの加熱加圧により仮膨張し変形加工前の断面形
状に近い形状まで復元させ、しかる後に、仮膨張パイプ
内に於いて皺探査装置を管軸方向に移動させることによ
りパイプ皺の有無を確認し、皺有りの場合には、該パイ
プを加熱軟化させた状態で、管径方向に拡縮可能な皺押
し延ばし手段の適用によりパイプ皺を押し延ばし消去
し、その後に、上記パイプを内部よりの加熱加圧により
変形加工前の断面形状を超える形状まで本膨張させ管内
面に被着させることを特徴とする既設管の補修工法に係
る。That is, according to the present invention, a plastic hard or semi-rigid pipe having an outer diameter slightly smaller than the inner diameter of an existing pipe is used as a repair material, and the pipe is deformed so as to reduce the effective outer diameter. After the pipe is inserted into the pipe, the pipe is temporarily expanded by heating and pressurizing from the inside to restore the pipe to a shape close to the cross-sectional shape before deformation processing, and then the wrinkle detection device is moved in the pipe axis direction in the temporarily expanded pipe. By checking the presence or absence of pipe wrinkles, in the case of wrinkles, in the state where the pipe is heated and softened, the pipe wrinkles are stretched and erased by applying a wrinkle pushing and expanding means capable of expanding and contracting in the pipe radial direction, Thereafter, the present invention relates to a method for repairing an existing pipe, wherein the pipe is fully expanded to a shape exceeding a cross-sectional shape before deformation processing by applying heat and pressure from the inside to adhere to the inner surface of the pipe.
【０００７】[0007]
【発明の実施の形態】以下に本発明の一実施形態を添付
図面に基づき説明すると次の通りである。本発明工法に
於いて補修材としては、通常、ポリエチレンから成形さ
れた厚肉、例えばＳＤＲ（口径／肉厚）が１５〜３０程
度の硬質乃至半硬質パイプ１が用いられる。パイプ１の
材質はポリエチレン以外の熱可塑性樹脂例えばポリ塩化
ビニル,ポリプロピレンなどであってもよい。DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the accompanying drawings. In the method of the present invention, as a repair material, a thick wall formed of polyethylene, for example, a hard or semi-rigid pipe 1 having an SDR (diameter / thickness) of about 15 to 30 is usually used. The material of the pipe 1 may be a thermoplastic resin other than polyethylene, such as polyvinyl chloride or polypropylene.
【０００８】上記パイプ１は既設管２の内径と略々等し
いか或いはこれより若干小さい外径、例えば既設管２の
内径の９０〜９８％に相当する外径を有し、図１に概略
的に示すように有効外径が減ずるように例えば押し出し
成型時の円管状からＵ字状に折り畳み加工され、この折
り畳みパイプ１′の状態で補修対象の既設管内に挿入さ
れる。上記折り畳み加工は、通常は上記パイプ１を軟化
点（１１０〜１２０℃程度）付近まで加熱した状態で行
うが、半硬質の場合には肉厚によっては加熱軟化無しに
行っても良い。The pipe 1 has an outer diameter substantially equal to or slightly smaller than the inner diameter of the existing pipe 2, for example, an outer diameter corresponding to 90 to 98% of the inner diameter of the existing pipe 2, and is schematically shown in FIG. As shown in (1), for example, the tube is folded into a U-shape from a tubular shape at the time of extrusion molding so as to reduce the effective outer diameter, and the folded pipe 1 'is inserted into an existing pipe to be repaired. The folding process is usually performed in a state where the pipe 1 is heated to around the softening point (about 110 to 120 ° C.). However, in the case of semi-rigid, it may be performed without heating softening depending on the wall thickness.
【０００９】図２に上記折り畳みパイプ１′を既設管２
内に挿入した状況が示されている。上記パイプ１′は、
既設管２内への挿入に先立ち内部流通の加熱流体例えば
スチームにより加熱軟化され可撓性が付与される。この
可撓性付与により折り畳みパイプ１′を管曲がり部２１
を含む既設管２に対しその全長に亘って支障なく挿入す
ることができる。既設管２の管曲がり部２１に於いて
は、特に曲率半径の小さい内側領域２１ａに於いて、パ
イプ１に圧縮がかかり座屈して皺１ａを生ずることがあ
る。FIG. 2 shows the above-mentioned folded pipe 1 ′
The situation inserted in is shown. The pipe 1 '
Prior to insertion into the existing pipe 2, it is heated and softened by a heating fluid flowing inside, for example, steam, so that flexibility is imparted. By providing this flexibility, the folded pipe 1 ′ can be bent at the pipe bending portion 21.
Can be inserted into the existing pipe 2 including the entire length without any trouble. In the bent portion 21 of the existing pipe 2, the pipe 1 may be compressed and buckled to form wrinkles 1a, particularly in the inner region 21a having a small radius of curvature.
【００１０】図３は管内挿入の上記パイプ１′を仮膨張
し、変形加工前の断面形状に近い状態、即ち既設管２の
外径の９０〜９８％に相当する外径に略々近い状態まで
膨張復元させた状態を示し、この仮膨張はパイプ１′内
にスチームを供給し、該パイプ１′を内部から例えば
０．２〜０．５kg／cm2（ゲージ圧）程度の低圧力のも
とに加熱加圧することにより行なわれる。この仮膨張時
には、座屈皺１ａの部分も一応膨張復元されるが、膨張
復元は他の部分に比較し不充分となり仮膨張パイプ１Ａ
上には内方突出の皺１ｂとして残ってしまう。FIG. 3 shows a state in which the pipe 1 'inserted in the pipe is temporarily expanded and has a shape close to the cross-sectional shape before deformation processing, that is, a state in which it is substantially close to the outer diameter corresponding to 90 to 98% of the outer diameter of the existing pipe 2. In this temporary expansion, steam is supplied into the pipe 1 ′ and the pipe 1 ′ is compressed from the inside to a low pressure of about 0.2 to 0.5 kg / cm 2 (gauge pressure). It is performed by heating and pressurizing. During this temporary expansion, the buckling wrinkles 1a are also temporarily expanded and restored, but the expansion and recovery are insufficient compared to other portions, and the temporary expansion pipe 1A
It remains on the top as inwardly protruding wrinkles 1b.
【００１１】而して、本発明に於いては、折り畳みパイ
プ１′の仮膨張を終えた後に、仮膨張パイプ１Ａ上の皺
１ｂの消去操作を行う。即ち、仮膨張を終えた後は、一
旦仮膨張パイプ１Ａを保形性が得られる状態まで冷却
し、さらにその両端部の未膨張部分を切断除去し、この
状態でパイプ１Ａ内に通線し、通線材３上にテレビカメ
ラ４と拡縮パッカー５とを取り付け、これらカメラ４及
びパッカー５は図４に示すようにパイプ１Ａ内の始端側
に設置する。Thus, in the present invention, after the temporary expansion of the folded pipe 1 'is completed, an operation of eliminating wrinkles 1b on the temporary expansion pipe 1A is performed. That is, after the completion of the temporary expansion, the temporary expansion pipe 1A is once cooled to a state in which shape retention is obtained, and the unexpanded portions at both ends are cut and removed. A television camera 4 and an enlargement / reduction packer 5 are mounted on the wire 3, and the camera 4 and the packer 5 are installed at the start end in the pipe 1 </ b> A as shown in FIG.
【００１２】パイプ１Ａ内へのテレビカメラ４及び拡縮
パッカー５の設置を終えた後は、パイプ１の両端に栓
６,６を施し、始端側の栓６からはパッカ５への拡縮用
流体導管５ａを又終端側の栓６からは通線材３を外部に
引き出しておく。この図４に示す状態で、始端側の栓６
に付設したスチーム供給管７からパイプ１内にスチーム
を供給し、終端側の栓６に付設したスチーム排出管８か
らのスチームの排出量を流量制御弁９により制御する。
これによりパイプ１内のスチーム圧力をパイプ形状の保
持に必要な圧力例えば０．１〜０．３kg／cm2程度の低
圧力に保持しつつ該パイプ１Ａの加熱軟化が行われる。After the television camera 4 and the expansion / contraction packer 5 have been installed in the pipe 1A, plugs 6, 6 are provided at both ends of the pipe 1, and the expansion / contraction fluid conduit from the start end side plug 6 to the packer 5 is provided. 5a, and the wire 3 is drawn out from the plug 6 on the terminal side. In the state shown in FIG.
Steam is supplied into the pipe 1 from a steam supply pipe 7 attached to the end of the pipe, and the amount of steam discharged from a steam discharge pipe 8 attached to the end plug 6 is controlled by a flow control valve 9.
Thus, the pipe 1A is heated and softened while the steam pressure in the pipe 1 is maintained at a pressure required for maintaining the pipe shape, for example, a low pressure of about 0.1 to 0.3 kg / cm 2 .
【００１３】スチームによる内部加熱によりパイプ１Ａ
が加熱軟化するに至った後は、図５に示すように、通線
材３の牽引操作をしてテレビカメラ４及び拡縮パッカー
５をパイプ１内に於いて移動させ、テレビカメラ４が最
初の皺を見つけると、該テレビカメラ４を通じパッカー
５と皺ａとの位置合わせを行う。Pipe 1A by internal heating by steam
After heat-softening, the TV camera 4 and the expansion / contraction packer 5 are moved within the pipe 1 by pulling the wire 3 as shown in FIG. Is found, the packer 5 is aligned with the wrinkles a through the television camera 4.
【００１４】図６に示すように、この位置合わせ状態の
もとに、パッカー５に導管５ａを通じ加圧流体例えば加
熱加圧空気を送り管径方向に拡張させると、皺１ｂは該
パッカー５の拡張により管径方向に押し延ばされる。こ
の皺１ｂの管径方向への押し延ばしは、パイプ１Ａの仮
膨張（９０〜９８％）状態即ち、既設管２との間に寸法
差に基づく間隙を存在させた状態で行われるので、スム
ーズに安定確実に行うことができる。パッカ５ーには、
拡張状態でのスチームの流通を可能とするために、管軸
方向に貫通する流通路５ｂ（図６参照）が備えられてい
る。このようにして、始端側から順番に皺を消去して行
くことにより、仮膨張パイプ１Ａ上から皺を一掃でき
る。As shown in FIG. 6, when a pressurized fluid, for example, heated pressurized air is fed to the packer 5 through the conduit 5a and expanded in the radial direction of the packer 5 under this alignment state, the wrinkles 1b of the packer 5 are formed. It is extended in the pipe diameter direction by expansion. Since the wrinkles 1b are extended in the pipe radial direction in a temporary expansion (90 to 98%) state of the pipe 1A, that is, in a state in which a gap based on a dimensional difference exists between the pipe 1A and the existing pipe 2, it is performed smoothly. It can be performed stably and reliably. Packer 5
In order to allow the steam to flow in the expanded state, a flow passage 5b (see FIG. 6) penetrating in the pipe axis direction is provided. In this manner, the wrinkles can be wiped out from the temporary expansion pipe 1A by sequentially removing the wrinkles from the start end side.
【００１５】皺を一掃した後は、図７に示すように、パ
イプ１Ａ内にスチームを供給し、パイプ１Ａ内のスチー
ム圧力を例えば１．２〜１．５kg／cm2程度まで上げ、
既設管２内径に対し９０〜９８％の外径の仮膨張パイプ
を１００％まで本膨張させることにより、既設管内に皺
のないパイプ内張り１Ｂを形成することができる。本膨
脹はテレビカメラ４及びパッカー５を管内に残したまま
で行ってもよいし或いは図７に示すように管外に回収し
た後に行うようにしてもよい。After the wrinkles are eliminated, as shown in FIG. 7, steam is supplied into the pipe 1A, and the steam pressure in the pipe 1A is increased to, for example, about 1.2 to 1.5 kg / cm 2 .
By completely expanding the temporary expansion pipe having an outer diameter of 90 to 98% with respect to the inner diameter of the existing pipe 2 to 100%, a pipe lining 1B without wrinkles can be formed in the existing pipe. This expansion may be performed with the television camera 4 and the packer 5 left inside the pipe, or may be performed after the TV camera 4 and the packer 5 are collected outside the pipe as shown in FIG.
【００１６】[0016]
【発明の効果】本発明によれば補修材として硬質乃至半
硬質のパイプを用いて、既設管内に皺のないパイプ内張
りを形成でき、高品質の内張りを形成することができ
る。According to the present invention, wrinkle-free pipe lining can be formed in an existing pipe by using a hard or semi-hard pipe as a repair material, and a high quality lining can be formed.
【図１】本発明工法に使用される補修材としてのパイプ
を有効外径が減ずるように変形加工した状態を示す縦断
面図である。FIG. 1 is a longitudinal sectional view showing a state in which a pipe as a repair material used in the method of the present invention is deformed so as to reduce the effective outer diameter.
【図２】図１に示すパイプを既設管内に挿入した状態を
概略的に示す縦断面図である。FIG. 2 is a longitudinal sectional view schematically showing a state where the pipe shown in FIG. 1 is inserted into an existing pipe.
【図３】既設管内挿入のパイプをパイプ内よりの加熱加
圧により仮膨張した状況を概略的に示す縦断面図であ
る。FIG. 3 is a longitudinal sectional view schematically showing a state in which a pipe inserted into an existing pipe is temporarily expanded by heating and pressurizing from inside the pipe.
【図４】皺消去のための準備工程の状況を示す縦断面図
である。FIG. 4 is a longitudinal sectional view showing the state of a preparation process for wrinkle elimination.
【図５】発見した皺と拡縮パッカとを位置合わせした状
態を概略的に示す縦断面図である。FIG. 5 is a longitudinal sectional view schematically showing a state in which a found wrinkle and an expansion / contraction packer are aligned.
【図６】皺を消去している状況を概略的に示す縦断面図
である。FIG. 6 is a longitudinal sectional view schematically showing a situation in which wrinkles are eliminated.
【図７】皺除去後、パイプを本膨張した状況を概略的に
示す縦断面図である。FIG. 7 is a longitudinal sectional view schematically showing a state where the pipe is fully expanded after removing wrinkles.
【図８】スチーム圧力を利用して皺の消去操作を行った
場合の皺の変形状況を概略的に示す説明図である。FIG. 8 is an explanatory view schematically showing a wrinkle deformation state when a wrinkle erasing operation is performed using steam pressure.
１ パイプ ２ 既設管 ３ 通線材 ４ テレビカメラ ５ 拡縮パッカ ６ 栓体 ７ スチーム供給管 ８ スチーム排出管 ９ 流量制御弁 DESCRIPTION OF SYMBOLS 1 Pipe 2 Existing pipe 3 Passing wire 4 TV camera 5 Expansion / contraction packer 6 Plug body 7 Steam supply pipe 8 Steam discharge pipe 9 Flow control valve
Claims (5)
さい外径のプラスチック製硬質乃至半硬質パイプを用
い、該パイプを有効外径が減ずるように変形加工した状
態で既設管内に挿入した後に、該パイプを内部よりの加
熱加圧により仮膨張し変形加工前の断面形状に近い形状
まで復元させ、しかる後に、仮膨張パイプ内に於いて皺
探査装置を管軸方向に移動させることによりパイプ皺の
有無を確認し、皺有りの場合には、該パイプを加熱軟化
させた状態で、管径方向に拡縮可能な皺押し延ばし手段
の適用によりパイプ皺を押し延ばし消去し、その後に、
上記パイプを内部よりの加熱加圧により変形加工前の断
面形状を超える形状まで本膨張させ管内面に被着させる
ことを特徴とする既設管の補修工法。1. A plastic hard or semi-rigid pipe having an outer diameter slightly smaller than the inner diameter of an existing pipe is used as a repair material, and the pipe is inserted into the existing pipe while being deformed so as to reduce the effective outer diameter. The pipe is temporarily expanded by heating and pressurizing from inside to restore the pipe to a shape close to the cross-sectional shape before deformation processing, and thereafter, the wrinkle detecting device is moved in the pipe axis direction in the temporarily expanded pipe to thereby form the pipe. Check the presence or absence of wrinkles, in the case of wrinkles, in the state where the pipe is heated and softened, apply and remove the wrinkles of the pipe by applying a wrinkle pushing and expanding means capable of expanding and contracting in the pipe radial direction, and thereafter,
A method of repairing an existing pipe, wherein the pipe is fully expanded to a shape exceeding a cross-sectional shape before deformation processing by heating and pressurizing from the inside and adhered to the inner surface of the pipe.
エチレン製で且つ既設管の内径の９０〜９８％に相当す
る外径を有していることを特徴とする請求項１記載の補
修工法。2. The repair method according to claim 1, wherein the pipe used as the repair material is made of polyethylene and has an outer diameter corresponding to 90 to 98% of the inner diameter of the existing pipe.
５〜３０であることを特徴とする請求項１又は２記載の
補修工法。3. The pipe has an SDR (diameter / thickness) of 1
The repair method according to claim 1 or 2, wherein the number is 5 to 30.
管径方向へ拡縮可能な拡張パッカーが適用され、該パッ
カーは縮小状態に於いて仮膨張パイプ内を管軸方向に移
動でき、拡張状態に於いてパイプ皺を押し延ばすことが
できることを特徴とする請求項１〜３のいずれかに記載
の補修工法。4. An expansion packer, which can be expanded and contracted in the pipe diameter direction by fluid control, is applied as the pushing and extending means, and the packer can move in the temporary expansion pipe in the pipe axis direction in the contracted state, and in the expanded state. The repair method according to any one of claims 1 to 3, wherein pipe wrinkles can be pushed out.
該テレビカメラは皺押し延ばし手段の管内移動方向の少
なくともいずれか一方側に該皺押し延ばし手段と一体移
動可能に設置されていることを特徴とする請求項１〜４
のいずれかに記載の補修工法。5. The wrinkle detecting means is a television camera in a tube,
5. The television camera according to claim 1, wherein the television camera is provided on at least one side of the moving direction of the wrinkle pushing and extending means so as to be integrally movable with the wrinkle pushing and extending means.
The repair method described in any of the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27697997A JP3617758B2 (en) | 1997-10-09 | 1997-10-09 | Repair method for existing pipes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27697997A JP3617758B2 (en) | 1997-10-09 | 1997-10-09 | Repair method for existing pipes |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11115051A true JPH11115051A (en) | 1999-04-27 |
| JP3617758B2 JP3617758B2 (en) | 2005-02-09 |
Family
ID=17577084
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27697997A Expired - Lifetime JP3617758B2 (en) | 1997-10-09 | 1997-10-09 | Repair method for existing pipes |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3617758B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004023088A1 (en) * | 2002-09-04 | 2004-03-18 | Terence Dominic Gillam | An inflatable pipe test probe |
| CN107331319A (en) * | 2017-07-27 | 2017-11-07 | 广东欧珀移动通信有限公司 | Lamp house cloth component and lamp box |
| JP2021079620A (en) * | 2019-11-19 | 2021-05-27 | 株式会社Ｓｏｒｓ | Existing pipe repair system and repair method |
-
1997
- 1997-10-09 JP JP27697997A patent/JP3617758B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004023088A1 (en) * | 2002-09-04 | 2004-03-18 | Terence Dominic Gillam | An inflatable pipe test probe |
| CN107331319A (en) * | 2017-07-27 | 2017-11-07 | 广东欧珀移动通信有限公司 | Lamp house cloth component and lamp box |
| CN107331319B (en) * | 2017-07-27 | 2023-05-05 | Oppo广东移动通信有限公司 | Lamp box cloth assembly and lamp box |
| JP2021079620A (en) * | 2019-11-19 | 2021-05-27 | 株式会社Ｓｏｒｓ | Existing pipe repair system and repair method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3617758B2 (en) | 2005-02-09 |
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