JP5008456B2 - Rehabilitation pipe member and pipe rehabilitation method - Google Patents

Rehabilitation pipe member and pipe rehabilitation method Download PDF

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JP5008456B2
JP5008456B2 JP2007130180A JP2007130180A JP5008456B2 JP 5008456 B2 JP5008456 B2 JP 5008456B2 JP 2007130180 A JP2007130180 A JP 2007130180A JP 2007130180 A JP2007130180 A JP 2007130180A JP 5008456 B2 JP5008456 B2 JP 5008456B2
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pipe
pipe member
rehabilitated
reduced
rehabilitation
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JP2008286271A (en
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孝知 原田
良一郎 中村
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Kubota CI Co Ltd
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Description

この発明は更生管部材および管路更生方法に関し、特にたとえば、既設管の更生に用いる、更生管部材および管路更生方法に関する。   The present invention relates to a rehabilitation pipe member and a pipe line rehabilitation method, and more particularly to a rehabilitation pipe member and a pipe line rehabilitation method used for rehabilitation of an existing pipe, for example.

従来のこの種の既設管の更生方法の一例が特許文献1に示されている。特許文献1の技術では、形状記憶温度にて円筒体に形状回復する性能が付与された状態で、断面外形面積が減少するように変形された複数の短管を用いる。これらの短管を用いて既設管を更生する際には、短管の端面同士を現場において接続してパイプライナを形成しつつ、既設管内にそのパイプライナを挿入していく。短管の端面同士を接続するときには、変形された形状(C字形)のまま接続する。或いは、短管の端部のみを一旦円筒体に加熱復元した後、円形の端面同士を接続し、その接続部を形状記憶温度まで加熱してC字形に再加工する。そして、既設管内にパイプライナを挿入した後、パイプライナを内部から加熱および加圧して既設管内面に密着させることによって、既設管路を更生する。
特開平11−270745号
An example of a conventional method for rehabilitating this type of existing pipe is disclosed in Patent Document 1. The technique of Patent Document 1 uses a plurality of short tubes that are deformed so that the cross-sectional outer area is reduced in a state where the shape recovery performance is imparted to the cylindrical body at the shape memory temperature. When rehabilitating an existing pipe using these short pipes, the pipe liners are inserted into the existing pipes while connecting the end faces of the short pipes in the field to form a pipe liner. When connecting the end faces of the short pipes, they are connected in a deformed shape (C-shape). Alternatively, only the end portion of the short tube is once heated and restored to the cylindrical body, and then the circular end surfaces are connected to each other, and the connecting portion is heated to the shape memory temperature and reworked into a C shape. And after inserting a pipe liner in an existing pipe, a pipe liner is heated and pressurized from the inside, and it makes the existing pipe line renewal by making it closely_contact | adhere to the existing pipe inner surface.
JP-A-11-270745

短管同士を接続する際には、接続する端面の形状がほぼ同じ形状でないと、復元後の更生管路に段差や薄肉部が生じてしまい、更生管路の強度低下などを招く。しかし、変形された特殊な形状のまま、短管の端面を同じ形状に揃えることは難しい。また、短管の端部だけを一旦円筒体に加熱復元して接続する場合、つまり短管の端面を円形に矯正して接続する場合、その端部だけを部分加熱することは難しい上、円筒形の外形規制具を用いて短管の端部を円筒体に復元させても、完全な円筒体に復元することは難しく、端面の形状は不揃いとなる。したがって、特許文献1の技術では、短管の端面同士を適切に接続することは困難である。   When short pipes are connected to each other, if the shape of the end faces to be connected is not substantially the same, a step or a thin part is generated in the rehabilitated pipe after restoration, resulting in a decrease in strength of the rehabilitated pipe. However, it is difficult to align the end faces of the short tubes in the same shape with the deformed special shape. In addition, when only the end of the short pipe is once restored to the cylindrical body and connected, that is, when the end face of the short pipe is corrected to be circular, it is difficult to partially heat only the end of the short pipe. Even if the end of the short tube is restored to a cylindrical body using a shape-shaped outer shape regulating tool, it is difficult to restore it to a complete cylindrical body, and the shape of the end face is uneven. Therefore, with the technique of Patent Document 1, it is difficult to properly connect the end faces of the short pipes.

それゆえに、この発明の主たる目的は、端面同士の接続が容易な、更生管部材および管路更生方法を提供することである。   Therefore, a main object of the present invention is to provide a rehabilitating pipe member and a pipe rehabilitation method in which end faces can be easily connected to each other.

本発明は、上記の課題を解決するために、以下の構成を採用した。なお、括弧内の参照符号および補足説明等は、本発明の理解を助けるために後述する実施の形態との対応関係を示したものであって、本発明を何ら限定するものではない。   The present invention employs the following configuration in order to solve the above problems. The reference numerals in parentheses, supplementary explanations, and the like indicate correspondence relationships with embodiments described later to help understanding of the present invention, and do not limit the present invention in any way.

請求項1の発明は、両端に形成される非縮径部と非縮径部に挟まれた縮径部とを備える更生管部材を順次接続しながら既設管内に挿入していくことによって既設管を更生する管路更生方法であって、(a)先行する更生管部材の非縮径部と後続する更生管部材の非縮径部とを接続し、(b)ステップ(a)で接続した非縮径部を縮径加工し、(c)ステップ(b)で非縮径部を縮径加工した更生管部材を既設管に所定距離挿入し、(d)ステップ(a)から(c)のステップを繰り返して、既設管の更生部分の全長に亘って更生管部材を既設管に挿入し、そして(e)ステップ(d)で既設管の更生部分の全長に亘って挿入した更生管部材を非縮径形状に復元させて、既設管内に更生管路を形成する、管路更生方法である。 According to the first aspect of the present invention, an existing pipe is formed by sequentially inserting a rehabilitated pipe member having a non-diametered portion formed at both ends and a reduced-diameter portion sandwiched between the non-diametered portions into the existing pipe while sequentially connecting them. (A) connecting the non-reduced diameter part of the preceding rehabilitated pipe member and the non-reduced diameter part of the succeeding rehabilitated pipe member, and (b) connecting them in step (a). (C) Steps (a) to (c) are carried out by reducing the diameter of the non-diametered portion, and (c) inserting the rehabilitated pipe member whose diameter is reduced in step (b) into the existing pipe by a predetermined distance. The rehabilitated pipe member is inserted over the entire length of the rehabilitated portion of the existing pipe, and the rehabilitated pipe member is inserted over the entire length of the rehabilitated portion of the existing pipe in step (d). Is a pipe rehabilitation method in which a rehabilitation pipe is formed in an existing pipe.

請求項1の発明では、更生管部材(10)を順次接続しながら既設管(50)内に挿入していくことによって既設管を更生する。先ず、ステップ(a)では、先行する更生管部材の非縮径部(12)と後続する更生管部材の非縮径部とをバット融着等して接続する。ステップ(b)では、ステップ(a)で接続した非縮径部を、たとえば、形状記憶温度で縮径部(14)と同様の形状に縮径加工する。ステップ(c)では、ステップ(b)で非縮径部を縮径加工した更生管部材を、たとえば更生管部材の長さに応じた距離だけ牽引し、既設管に挿入する。ステップ(d)では、ステップ(a)から(c)のステップを繰り返して、既設管の更生部分の全長に亘って更生管部材を既設管に挿入する。ただし、1度の更生管部材同士の接続によって、更生管部材を既設管の更生部分の全長に亘って挿入できる場合には、ステップ(a)から(c)のステップを繰り返す必要は無い。そして、ステップ(e)では、既設管に挿入した更生管部材を、蒸気などの加熱流体を用いて加熱および加圧することによって非縮径形状に復元させて、既設管内に更生管路を形成する。 In invention of Claim 1, the existing pipe is renewed by inserting in the existing pipe (50), connecting the renovated pipe member (10) sequentially. First, in step (a), the non-reduced diameter portion (12) of the preceding rehabilitated pipe member and the non-reduced diameter portion of the succeeding rehabilitated pipe member are connected by butt fusion or the like. In step (b), the non-reduced diameter portion connected in step (a) is reduced in diameter to the same shape as the reduced diameter portion (14) at the shape memory temperature, for example. In step (c), the rehabilitated pipe member whose diameter is reduced in step (b) is pulled, for example, by a distance corresponding to the length of the rehabilitated pipe member and inserted into the existing pipe. In step (d), steps (a) to (c) are repeated, and the rehabilitated pipe member is inserted into the existing pipe over the entire length of the rehabilitated portion of the existing pipe. However, if the rehabilitated pipe member can be inserted over the entire length of the rehabilitated portion of the existing pipe by connecting the rehabilitated pipe members once, it is not necessary to repeat steps (a) to (c). In step (e), the rehabilitated pipe member inserted into the existing pipe is restored to a non-reduced shape by heating and pressurizing using a heating fluid such as steam to form a rehabilitated pipe line in the existing pipe. .

請求項1の発明によれば、その両端に非縮径部を有する更生管部材を用いるので、更生管部材の端面同士の接続を容易に行うことができる。また、非縮径部を縮径加工した後に更生管部材を既設管に挿入するので、既設管への更生管部材の挿入を容易に行うことができる。 According to invention of Claim 1, since the rehabilitation pipe member which has a non-diameter-reduced part in the both ends is used, the connection of the end surfaces of a rehabilitation pipe member can be performed easily. Further, since the rehabilitated pipe member is inserted into the existing pipe after the non-reduced diameter portion is reduced, the rehabilitated pipe member can be easily inserted into the existing pipe.

請求項2の発明は、請求項1に記載の管路更生方法に用いられる更生管部材であって、両端に形成される非縮径部、および非縮径部に挟まれた縮径部を備える、更生管部材である。 Invention of Claim 2 is the rehabilitation pipe member used for the pipe line rehabilitation method of Claim 1, Comprising: The non-diameter part formed in both ends, and the diameter reduction part pinched | interposed into the non-diameter part The rehabilitation pipe member is provided.

請求項2の発明では、更生管部材(10)は、後続する更生管部材に順次接続されながら既設管(50)内に挿入されていくことによって既設管を更生する。更生管部材は、両端に形成される非縮径部(12)および非縮径部に挟まれて形成される縮径部(14)を含む。非縮径部は、押出成形により押し出されたときのままの形状(たとえば、断面円形)を有する。また、縮径部は、その外径が非縮径部よりも小さくなるように変形された縮径形状(たとえば、断面U字形)を有し、形状記憶温度で非縮径形状に復元する機能を有する。ここで、非縮径形状とは、更生管部材の成形で押出成形により押し出されたときの形状をいう。非縮径部には、非縮径形状のまま縮径などの変形が加えられていないので、変形によって生じる歪みや変形跡などが発生しておらず、非縮径部は均一な形状となる。すなわち、更生管部材の端面の形状を均一に揃えることができる。 In the invention of claim 2, the rehabilitated pipe member (10) rehabilitates the existing pipe by being inserted into the existing pipe (50) while being sequentially connected to the subsequent rehabilitated pipe member. The rehabilitation pipe member includes a non-reduced diameter portion (12) formed at both ends and a reduced diameter portion (14) formed between the non-reduced diameter portions. The non-reduced diameter portion has a shape (for example, a circular cross section) as it is when extruded by extrusion molding. Further, the reduced diameter portion has a reduced diameter shape (for example, a U-shaped cross section) that is deformed so that the outer diameter is smaller than that of the non-reduced diameter portion, and a function of restoring the non-reduced shape at the shape memory temperature. Have Here, the non-diameter-shaped shape means a shape when extruded by extrusion molding in the rehabilitation pipe member. Since the non-reduced portion is not deformed in the non-reduced shape, it is not deformed such as reduced diameter. Therefore, the distortion or deformation trace caused by the deformation does not occur, and the non-reduced portion has a uniform shape. . That is, the shape of the end face of the rehabilitation pipe member can be made uniform.

請求項2の発明によれば、両端に非縮径部を形成したので、段差や肉薄部を生じること無く端面同士を容易に接続することができる。 According to the second aspect of the present invention, since the non-reduced diameter portions are formed at both ends, the end faces can be easily connected without causing a step or a thin portion.

請求項3の発明は、請求項1に記載の管路更生方法に用いられる更生管部材の製造方法であって、(a)管を押出成形するステップ、および(b)形状記憶温度で管を外面から軸方向に沿って押しつぶすようにして、所定長さの縮径部分を形成するステップを含む、更生管部材の製造方法である。 Invention of Claim 3 is a manufacturing method of the rehabilitation pipe member used for the pipe line renovation method of Claim 1, Comprising: (a) Extruding a pipe | tube, and (b) A pipe | tube at shape memory temperature. A method for manufacturing a rehabilitated pipe member including a step of forming a reduced diameter portion having a predetermined length by crushing along an axial direction from an outer surface.

請求項3の発明では、たとえば、押出機(20)を用いて断面円形等の管(22)を押出成形し、この管を形状記憶温度まで冷却する。続いて、形状記憶温度の管を外面から押しつぶすようにして、軸方向に延びる所定長さの縮径部分を所定間隔毎に形成する。そして、管を適宜な長さ(一定長さ)毎に切断することによって更生管部材(10)を形成する。ただし、押出成形した管を適宜な長さに切断した後、所定長さの縮径部分を形成することもできる。このように形成した縮径部分が更生管部材の縮径部(14)となり、縮径部は、形状記憶温度で非縮径形状(たとえば円筒形)に形状回復する機能を有する。また、縮径部分を形成しない部分が更生管部材の非縮径部(12)となり、非縮径部は、押出成形により押し出したときのままの形状を有する。   In the invention of claim 3, for example, a tube (22) having a circular cross section is extruded using an extruder (20), and the tube is cooled to a shape memory temperature. Subsequently, the tube having the shape memory temperature is crushed from the outer surface, and a reduced diameter portion having a predetermined length extending in the axial direction is formed at predetermined intervals. And the rehabilitation pipe member (10) is formed by cut | disconnecting a pipe | tube for every suitable length (fixed length). However, after the extruded tube is cut to an appropriate length, a reduced diameter portion having a predetermined length can be formed. The reduced diameter portion thus formed becomes the reduced diameter portion (14) of the rehabilitated pipe member, and the reduced diameter portion has a function of recovering its shape to a non-reduced shape (for example, a cylindrical shape) at the shape memory temperature. Moreover, the part which does not form a reduced diameter part becomes the non-reduced diameter part (12) of a rehabilitation pipe member, and a non-reduced diameter part has a shape as it was extruded by extrusion molding.

請求項4の発明は、請求項1に記載の管路更生方法に用いられる更生管部材の非縮径部を縮径加工するための加工装置であって、蒸気口および更生管部材を出し入れするための開口を有するチャンバ、チャンバ内に設けられる管受台、および上下動可能にチャンバ内に設けられて、下動したときに非縮径部を外面から押し込む押圧部を備える、加工装置である。 Invention of Claim 4 is a processing apparatus for carrying out diameter reduction processing of the non-diametered part of the rehabilitation pipe member used for the pipe rehabilitation method of Claim 1, Comprising: A steam port and the rehabilitation pipe member are taken in and out A processing apparatus comprising: a chamber having an opening for opening; a tube pedestal provided in the chamber; and a pressing portion that is provided in the chamber so as to be movable up and down and pushes the non-diametered portion from the outer surface when moved downward. .

請求項4の発明では、加工装置(32)は、チャンバ(34)を含み、チャンバには、その内部に蒸気等の加熱流体を供給するための蒸気口(40)、および更生管部材(10)を出し入れするための開口(42)が形成される。また、チャンバの内部には、管受台(36)および押圧部(38)が設けられる。管受台の上面には、たとえば、更生管部材の縮径部(14)に相当する径を有する断面半円形の窪み部(36a)が形成される。押圧部は、たとえば、油圧シリンダ(44)等によって上下動可能であり、縮径部の凹部(16)に相当する形状を有する。加工装置の管受台の上に更生管部材の非縮径部(12)を置き、加熱流体をチャンバ内に供給して更生管部材を形状記憶温度に加熱した後、押圧部を下動させて非縮径部を外面から押し込むことによって、非縮径部は、縮径部と同様の形状等に縮径加工される。このように縮径加工された非縮径部は、形状記憶温度で非縮径形状に形状回復する機能を有する。   In the invention of claim 4, the processing device (32) includes a chamber (34), and a steam port (40) for supplying a heating fluid such as steam into the chamber, and a rehabilitation pipe member (10). ) Is formed. In addition, a tube holder (36) and a pressing portion (38) are provided inside the chamber. A recess (36a) having a semicircular cross section having a diameter corresponding to the reduced diameter portion (14) of the rehabilitated pipe member is formed on the upper surface of the tube cradle, for example. The pressing portion can be moved up and down by, for example, a hydraulic cylinder (44) or the like, and has a shape corresponding to the concave portion (16) of the reduced diameter portion. Place the non-reduced diameter portion (12) of the rehabilitated pipe member on the tube pedestal of the processing apparatus, supply the heating fluid into the chamber and heat the rehabilitated pipe member to the shape memory temperature, and then move the pressing part downward. By pushing the non-reduced portion from the outer surface, the non-reduced portion is reduced in diameter to the same shape as the reduced diameter portion. The non-diametered portion thus reduced in diameter has a function of recovering the shape to the non-diametered shape at the shape memory temperature.

この発明によれば、その両端に非縮径部を有する更生管部材を用いるので、更生管部材の端面同士の接続を容易に行うことができる。また、非縮径部を縮径加工した後に更生管部材を既設管に挿入するので、既設管への更生管部材の挿入を容易に行うことができる。 According to this invention, since the rehabilitation pipe member which has a non-reduced diameter part in the both ends is used, the end surfaces of a rehabilitation pipe member can be connected easily. Further, since the rehabilitated pipe member is inserted into the existing pipe after the non-reduced diameter portion is reduced, the rehabilitated pipe member can be easily inserted into the existing pipe.

この発明の上述の目的,その他の目的,特徴および利点は、図面を参照して行う以下の実施例の詳細な説明から一層明らかとなろう。   The above object, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

図1を参照して、この発明の一実施例である更生管部材10は、他の更生管部材10と順次接続されながら、既設管50内に挿入されていくことによって既設管50を更生する。更生管部材10は、ポリエチレンやポリ塩化ビニル等の熱可塑性樹脂によって形成され、両端に形成される非縮径部12、および非縮径部12に挟まれて形成される縮径部14を含む。   Referring to FIG. 1, rehabilitation pipe member 10 according to an embodiment of the present invention is rehabilitated in existing pipe 50 by being inserted into existing pipe 50 while being sequentially connected to other rehabilitation pipe members 10. . The rehabilitation pipe member 10 is formed of a thermoplastic resin such as polyethylene or polyvinyl chloride, and includes a non-reduced diameter portion 12 formed at both ends, and a reduced diameter portion 14 formed between the non-reduced diameter portions 12. .

非縮径部12は、後述するように、押出成形により押し出されたときのままの形状を有しており、図2(A)に示すように、円形の断面形状を有する。非縮径部12の軸方向の長さは、たとえば500mmである。また、非縮径部12の外径は、既設管50の内径に相当する大きさに設定され、たとえば300−500mmである。   As will be described later, the non-reduced diameter portion 12 has a shape as it is extruded by extrusion, and has a circular cross-sectional shape as shown in FIG. The axial length of the non-diametered portion 12 is, for example, 500 mm. The outer diameter of the non-reduced diameter portion 12 is set to a size corresponding to the inner diameter of the existing pipe 50, and is, for example, 300 to 500 mm.

縮径部14は、後述するように、押出成形後の管の一部をその外径が小さくなるように変形することによって形成され、図2(B)に示すように、その外面に軸方向に延びる凹部16が形成されるU字形(或いはハート形ないしC字形)の断面形状を有する。縮径部14は、中央部14aおよび端部14bを含み、縮径部14の軸方向の長さは、たとえば4000mmである。縮径部14の中央部14aは、その断面形状がほぼ一定の直管状に形成される。中央部14aの外径は、非縮径部12の外径の60−70%程度の大きさになるように設定され、たとえば180−350mmである。また、縮径部14の端部14bは、たとえば300mmの長さに亘り、非縮径部12に向かうに従い徐々に拡径して断面形状が円形に近づき、非縮径部12と一体となる。このような縮径部14は、形状記憶温度に加熱することによって、非縮径形状に形状回復する機能を有する。ここで、非縮径形状とは、更生管部材10の成形で押出成形により押し出されたときの形状をいう。この実施例では、縮径部14は、形状記憶温度に加熱することによって円筒形に形状回復し、円筒形に復元された状態では非縮径部12と同径となる。   As will be described later, the reduced diameter portion 14 is formed by deforming a part of a tube after extrusion so that the outer diameter thereof becomes smaller. As shown in FIG. It has a U-shaped (or heart-shaped or C-shaped) cross-sectional shape in which a concave portion 16 extending in the shape is formed. The reduced diameter portion 14 includes a central portion 14a and an end portion 14b, and the length of the reduced diameter portion 14 in the axial direction is, for example, 4000 mm. The central portion 14a of the reduced diameter portion 14 is formed in a straight tube having a substantially constant cross-sectional shape. The outer diameter of the central portion 14a is set to be about 60-70% of the outer diameter of the non-reduced diameter portion 12, and is, for example, 180-350 mm. Further, the end portion 14b of the reduced diameter portion 14 has a length of, for example, 300 mm, and gradually increases in diameter toward the non-reduced diameter portion 12 so that the cross-sectional shape approaches a circular shape, and is integrated with the non-reduced diameter portion 12. . Such a reduced diameter portion 14 has a function of recovering its shape to a non-reduced shape by heating to the shape memory temperature. Here, the non-diametered shape refers to a shape when the rehabilitated pipe member 10 is extruded by extrusion molding. In this embodiment, the reduced diameter portion 14 recovers to a cylindrical shape by heating to the shape memory temperature, and has the same diameter as the non-reduced diameter portion 12 when restored to the cylindrical shape.

更生管部材10の製造方法としては、たとえば、以下に示す方法を用いることができる。図3を参照して、先ず、押出機20を用いて円筒管22を押出成形し(たとえば190℃の押出温度)、その円筒管22を冷却水槽24a中を通過させて形状記憶温度(たとえば125℃)まで冷却する。続いて、円筒管22を引取装置28によって引っ張りながら、縮径装置26を用いて、軸方向に沿って円筒管22を外面から押しつぶすようにしてその外径が小さくなるように変形し、所定長さを有する断面U字形の縮径部分を所定間隔毎に形成していく。この縮径部分が縮径部14となり、縮径部分が形成されない円筒形のままの部分が非縮径部12となる。その後、冷却水槽24b等を通過させて縮径部分を形成した円筒管22を適宜冷却し、切断機30を用いて一定長さ毎に円筒管22を切断することによって、更生管部材10を成形する。このようにすれば、更生管部材10を連続的に製造することができる。また、円筒管22に縮径部分を形成する工程は、円筒管22を形状記憶温度に加熱した状態で行う必要があるが、押出成形後の既に加熱された状態の円筒管22を、冷却水槽24aを通過させるだけで形状記憶温度に調整できるので、加熱機構を別途設ける必要が無く、効率的である。   As a manufacturing method of the rehabilitation pipe member 10, for example, the following method can be used. Referring to FIG. 3, first, a cylindrical tube 22 is extruded using an extruder 20 (for example, an extrusion temperature of 190 ° C.), and the cylindrical tube 22 is passed through a cooling water tank 24a so as to have a shape memory temperature (for example, 125). ℃). Subsequently, while pulling the cylindrical tube 22 by the take-up device 28, the diameter reducing device 26 is used to deform the cylindrical tube 22 from the outer surface along the axial direction so that the outer diameter is reduced to a predetermined length. A reduced-diameter portion having a U-shaped cross section is formed at predetermined intervals. This reduced diameter portion becomes the reduced diameter portion 14, and the cylindrical portion where the reduced diameter portion is not formed becomes the non-reduced diameter portion 12. Thereafter, the cylindrical tube 22 formed with the reduced diameter portion by passing through the cooling water tank 24b or the like is appropriately cooled, and the regenerated tube member 10 is formed by cutting the cylindrical tube 22 every predetermined length using the cutting machine 30. To do. If it does in this way, the rehabilitation pipe member 10 can be manufactured continuously. Further, the step of forming the reduced diameter portion in the cylindrical tube 22 needs to be performed in a state where the cylindrical tube 22 is heated to the shape memory temperature, but the already heated cylindrical tube 22 after the extrusion is formed in the cooling water tank. Since it can be adjusted to the shape memory temperature by simply passing 24a, there is no need to provide a separate heating mechanism, which is efficient.

このように形成された更生管部材10の非縮径部12には、押出成形により押し出されたときの形状のまま、つまり非縮径形状のまま、縮径などの変形が加えられていないので、変形によって生じる歪みや変形跡などが発生しておらず、非縮径部12は、均一な形状となる。つまり、更生管部材10の端面の形状は均一となる。   Since the non-reduced diameter portion 12 of the rehabilitated pipe member 10 formed in this manner remains in the shape when extruded by extrusion molding, that is, remains in a non-reduced shape and is not deformed such as reduced diameter. No distortion or deformation trace caused by the deformation occurs, and the non-diametered portion 12 has a uniform shape. That is, the shape of the end face of the rehabilitation pipe member 10 is uniform.

なお、更生管部材10の製造方法は上述の方法に限定されず、適宜な方法を採用できる。図示は省略するが、たとえば、切断機30を縮径装置26の前に配置して、押出成形した円筒管22を一定長さに切断した後に、押込装置を用いて一定長さの円筒管22を縮径装置26に押し込みながら、円筒管22に縮径部分を形成していくこともできる。   In addition, the manufacturing method of the rehabilitation pipe member 10 is not limited to the above-mentioned method, A suitable method is employable. Although illustration is omitted, for example, after the cutting machine 30 is arranged in front of the diameter reducing device 26 and the extruded cylindrical tube 22 is cut to a certain length, the cylindrical tube 22 having a certain length is pushed using a pushing device. It is also possible to form a reduced diameter portion in the cylindrical tube 22 while pushing it into the diameter reducing device 26.

また、更生管部材10を成形した後は、図4に示すように、縮径部14の外面にバンドや紐などの規制具18を装着して、更生管部材10の保管および搬送等を行うとよい。これによって、縮径部14の自然拡径が防止されて縮径部14の縮径形状が維持され、更生管部材10の搬送等を容易に行うことができる。なお、規制具18を用いる場合には、現場で更生管部材10を使用する前、或いは更生管部材10を既設管50内に挿入する前に、更生管部材10から規制具18を取り外す必要がある。   In addition, after the rehabilitated pipe member 10 is formed, as shown in FIG. 4, a regulating tool 18 such as a band or a string is attached to the outer surface of the reduced diameter portion 14 to store and transport the rehabilitated pipe member 10. Good. Thereby, the natural diameter expansion of the diameter-reduced part 14 is prevented, the diameter-reduced shape of the diameter-reduced part 14 is maintained, and the rehabilitation pipe member 10 can be easily conveyed. In addition, when using the restriction tool 18, it is necessary to remove the restriction tool 18 from the rehabilitation pipe member 10 before using the rehabilitation pipe member 10 at the site or inserting the rehabilitation pipe member 10 into the existing pipe 50. is there.

このような更生管部材10は、先行する更生管部材10の非縮径部12と後続する更生管部材10の非縮径部12とが順次接続されながら、既設管50内に順次挿入されることによって、既設管50を更生する。ただし、非縮径部12の外径は、既設管50の内径に相当する大きさに設定されるため、このままでは更生管部材10を既設管50内に挿入し難い。そこで、この実施例では、更生管部材10を既設管50内に挿入する前に、加工装置32を用いて、更生管部材10の非縮径部12を縮径部14の中央部14aと同様の形状に変形する。   Such a rehabilitated pipe member 10 is sequentially inserted into the existing pipe 50 while the non-reduced diameter part 12 of the preceding rehabilitated pipe member 10 and the non-reduced diameter part 12 of the subsequent rehabilitated pipe member 10 are sequentially connected. As a result, the existing pipe 50 is rehabilitated. However, since the outer diameter of the non-reduced diameter portion 12 is set to a size corresponding to the inner diameter of the existing pipe 50, it is difficult to insert the renovated pipe member 10 into the existing pipe 50 as it is. Therefore, in this embodiment, before inserting the rehabilitated pipe member 10 into the existing pipe 50, the non-reduced diameter part 12 of the rehabilitated pipe member 10 is the same as the central part 14 a of the reduced diameter part 14 using the processing device 32. Deforms to the shape of

ここで、加工装置32は、図5および図6に示すように、現場において非縮径部12を変形して縮径するための装置であり、チャンバ34、管受台36および押圧部38等を備える。チャンバ34は、その内部に蒸気等の加熱流体を供給するための蒸気口40および更生管部材10を出し入れするための開口部42を有する箱型に形成される。管受台36は、チャンバ34内に設けられ、その上面には、縮径部14の中央部14aの外径に相当する径を有する断面半円形の窪み部36aが形成される。押圧部38は、油圧シリンダ44等によって上下動可能にチャンバ34内に設けられ、縮径部14の凹部16に相当する形状を有する。   Here, as shown in FIGS. 5 and 6, the processing device 32 is a device for deforming and reducing the diameter of the non-diametered portion 12 in the field, and includes a chamber 34, a tube support 36, a pressing portion 38, and the like. Is provided. The chamber 34 is formed in a box shape having a steam port 40 for supplying a heating fluid such as steam therein and an opening 42 for taking in and out the rehabilitation pipe member 10. The tube pedestal 36 is provided in the chamber 34, and a semicircular recess 36 a having a diameter corresponding to the outer diameter of the central portion 14 a of the reduced diameter portion 14 is formed on the upper surface thereof. The pressing portion 38 is provided in the chamber 34 so as to be vertically movable by the hydraulic cylinder 44 or the like, and has a shape corresponding to the concave portion 16 of the reduced diameter portion 14.

この加工装置32を用いて非縮径部12を縮径する際には、先ず、開口部42を利用して非縮径部12をチャンバ34内に入れ、管受台36の上にセットする(図5および図6(A)参照)。次に、開口部42をシール部材46によって密封した後、蒸気ホース48から蒸気口40を介してチャンバ34内に蒸気を供給し、非縮径部12を形状記憶温度まで加熱する。そして、押圧部38を下動させて非縮径部12を外面から押し込むことによって、非縮径部12を断面U字形に変形させて縮径する(図6(b)参照)。このように、加工装置32を用いて非縮径部12を縮径することによって、既設管50内に更生管部材10を容易に挿入できるようになる。   When the non-diametered portion 12 is reduced in diameter using this processing device 32, first, the non-diametered portion 12 is put into the chamber 34 using the opening 42 and set on the tube receiving base 36. (See FIGS. 5 and 6A). Next, after the opening 42 is sealed by the seal member 46, steam is supplied from the steam hose 48 into the chamber 34 via the steam port 40, and the non-diametered portion 12 is heated to the shape memory temperature. Then, the non-diameter-reduced portion 12 is deformed into a U-shaped cross section by reducing the diameter of the non-diameter-reduced portion 12 by moving the pressing portion 38 downward (see FIG. 6B). In this way, by reducing the diameter of the non-diametered portion 12 using the processing device 32, the rehabilitated pipe member 10 can be easily inserted into the existing pipe 50.

なお、このように縮径した非縮径部12は、縮径部14と同様に、形状記憶温度に加熱することによって、非縮径形状(つまり円筒形)に形状回復する機能を有する。また、非縮径部12を縮径する際には、縮径部14の端部14bも同時に縮径され、更生管部材10は、断面形状がほぼ一定の縮径形状を有する直管状になる。これによって、更生管部材10は全長に亘って同様の形状復元性を有するようになる。   In addition, the non-reduced diameter part 12 reduced in diameter in this way has a function of recovering its shape to a non-reduced diameter (that is, a cylindrical shape) by heating to the shape memory temperature, similarly to the reduced diameter part 14. Further, when the non-diameter portion 12 is reduced in diameter, the end portion 14b of the reduced diameter portion 14 is also reduced in diameter at the same time, and the rehabilitation pipe member 10 becomes a straight tube having a reduced diameter shape with a substantially constant cross-sectional shape. . Thereby, the rehabilitation pipe member 10 comes to have the same shape restoring property over the entire length.

図7−図10を参照して、上述のような更生管部材10を用いて既設管50を更生する更生方法を以下に示す。先ず、既設管50の更生部分の両端部に応じた位置に、第1立坑52および第2立坑54を設け、それらの位置の既設管50を切断して外部に撤去する。   A rehabilitation method for rehabilitating an existing pipe 50 using the rehabilitation pipe member 10 as described above will be described below with reference to FIGS. First, the 1st shaft 52 and the 2nd shaft 54 are provided in the position according to the both ends of the renovation part of the existing pipe 50, the existing pipe 50 of those positions is cut | disconnected, and it removes outside.

既設管50は、土中に埋設される鉄筋コンクリート管や鉄管などであって、その内径は、たとえば300mm〜500mmである。第1立坑52は、更生管部材10の長さ(この実施例では5m)よりも長い長さ(たとえば、7〜8m)を有し、更生する既設管50の一方端に応じた位置に設けられる。このように更生管部材10の長さより長い長さの第1立坑52を設けるのは、詳細は後述するように、第1立坑52の内部において、更生管部材10同士の接続作業などを行うためである。また、第2立坑54は、更生する既設管50の他端に応じた位置に設けられる。この第2立坑54は、第1立坑52のように大きなものにする必要は無く、作業者がその内部に入って適宜作業できる程度の広さがあればよい。   The existing pipe 50 is a reinforced concrete pipe or an iron pipe buried in the soil, and the inner diameter thereof is, for example, 300 mm to 500 mm. The first shaft 52 has a length (for example, 7 to 8 m) longer than the length of the rehabilitated pipe member 10 (5 m in this embodiment), and is provided at a position corresponding to one end of the existing pipe 50 to be rehabilitated. It is done. The reason why the first shaft 52 having a length longer than the length of the rehabilitated pipe member 10 is provided in order to connect the rehabilitated pipe members 10 to each other in the first shaft 52 as will be described in detail later. It is. Moreover, the 2nd shaft 54 is provided in the position according to the other end of the existing pipe 50 to rehabilitate. The second shaft 54 does not need to be as large as the first shaft 52, and may be wide enough for an operator to enter the interior and work appropriately.

第1立坑52および第2立坑54を設けると、次に、既設管50内の異物除去および洗浄を行い、第1立坑52の内部にバット融着機56および上述の加工装置32等を搬入する。また、第2立坑54側の地上にウィンチ58を用意し、そのウィンチ58に連結したワイヤやロープ等の牽引具60を、第2立坑54側から既設管50内を介して第1立坑52側まで通しておく。   Once the first shaft 52 and the second shaft 54 are provided, the foreign matter in the existing pipe 50 is removed and washed, and the butt fusion machine 56 and the above-described processing device 32 are carried into the first shaft 52. . A winch 58 is prepared on the ground on the second shaft 54 side, and a traction tool 60 such as a wire or rope connected to the winch 58 is connected to the first shaft 52 side from the second shaft 54 through the existing pipe 50. Leave until.

続いて、更生管部材10を第1立坑52の内部に搬入し、第1立坑52内において、先行する更生管部材10に後続する更生管部材10を順次接続しながら、接続した更生管部材10を既設管50内に順次挿入していく。   Subsequently, the rehabilitated pipe member 10 is carried into the first shaft 52, and the rehabilitated pipe member 10 connected to the rehabilitated pipe member 10 subsequent to the preceding rehabilitated pipe member 10 is sequentially connected in the first shaft 52. Are sequentially inserted into the existing pipe 50.

具体的には、先ず、図7に示すように、第1の更生管部材10の一方端側の非縮径部12を、加工装置32を用いて縮径加工し、縮径加工した非縮径部12に牽引具60を取り付けるための固定具62を取り付け、既設管50内を通しておいた牽引具60をその固定具62に取り付ける。そして、第1の更生管部材10をウィンチ58および牽引具60を用いて牽引し、既設管50内に挿入する。この際には、少なくとも第1の更生管部材10の他端側の非縮径部12および縮径部14の端部14bを、既設管50から第1立坑52の内部に突出させておく。続いて、バット融着機56を用いて、第1の更生管部材10の他端側の非縮径部12に第2の更生管部材10の一方端側の非縮径部12をバット融着(接続)する。   Specifically, first, as shown in FIG. 7, the non-reduced diameter portion 12 on one end side of the first rehabilitated pipe member 10 is subjected to diameter reduction processing using a processing device 32, and the diameter reduction processing is performed. A fixing tool 62 for attaching the traction tool 60 is attached to the diameter portion 12, and the traction tool 60 passed through the existing pipe 50 is attached to the fixing tool 62. Then, the first rehabilitated pipe member 10 is pulled using the winch 58 and the traction tool 60 and inserted into the existing pipe 50. At this time, at least the non-reduced diameter portion 12 on the other end side of the first rehabilitated pipe member 10 and the end portion 14 b of the reduced diameter portion 14 are projected from the existing pipe 50 into the first shaft 52. Subsequently, the butt fusion machine 56 is used to butt-melt the non-diametered portion 12 on the one end side of the second retreaded tube member 10 to the non-diametered portion 12 on the other end side of the first retreaded tube member 10. Connect (connect).

次に、図8に示すように、加工装置32を用いて、バット融着した非縮径部12を断面U字形に縮径加工する。そして、図9に示すように、更生管部材10の長さの分だけウィンチ58および牽引具60を用いて牽引し、更生管部材10を既設管50内に挿入する。これらの作業、つまり更生管部材10同士の接続、非縮径部12の縮径および既設管50への挿入作業を順次繰り返し、既設管50の更生部分の全長に亘って、更生管部材10を挿入する。なお、1度の更生管部材10同士の接続によって、更生管部材10を既設管50の更生部分の全長に亘って挿入できる場合には、これらの作業を繰り返す必要は無い。   Next, as shown in FIG. 8, the non-diameter-reduced portion 12 that has been butt-fused is reduced to a U-shaped cross section using a processing device 32. Then, as shown in FIG. 9, the rehabilitation pipe member 10 is pulled by the length of the rehabilitation pipe member 10 using the winch 58 and the traction tool 60, and the rehabilitation pipe member 10 is inserted into the existing pipe 50. These operations, that is, the connection between the rehabilitated tube members 10, the diameter reduction of the non-reduced diameter portion 12 and the insertion operation into the existing tube 50 are sequentially repeated, and the rehabilitated tube member 10 is moved over the entire length of the rehabilitated portion of the existing tube 50. insert. If the rehabilitated pipe member 10 can be inserted over the entire length of the rehabilitated portion of the existing pipe 50 by connecting the rehabilitated pipe members 10 once, it is not necessary to repeat these operations.

既設管50への更生管部材10の挿入作業が全て終了すると、次に、更生管部材10の復元作業を行う。具体的には、図10に示すように、先ず、既設管50内に挿入した更生管部材10の両端、つまり第一の更生管部材10の一方端と最後尾の更生管部材10の他端とを、封止部材64によって封止する。そして、加熱流体供給機66から更生管部材10の内部に蒸気などの加熱流体を供給し、加熱流体による加熱および加圧によって更生管部材10を非縮径形状、つまり円筒形に復元し、既設管50内に更生管路を形成する。最後に、外部に撤去した既設管50を戻し、第1立坑52および第2立坑54を埋め戻すなどの後処理を適宜行い、既設管50の更生作業を終了する。   When all the operations for inserting the rehabilitated pipe member 10 into the existing pipe 50 are completed, the rehabilitated pipe member 10 is then restored. Specifically, as shown in FIG. 10, first, both ends of the rehabilitation pipe member 10 inserted into the existing pipe 50, that is, one end of the first rehabilitation pipe member 10 and the other end of the rearmost rehabilitation pipe member 10. Are sealed by a sealing member 64. Then, a heating fluid such as steam is supplied from the heating fluid supply machine 66 to the inside of the rehabilitation pipe member 10, and the rehabilitation pipe member 10 is restored to a non-reduced shape, that is, a cylindrical shape by heating and pressurization with the heating fluid. A rehabilitation line is formed in the tube 50. Finally, the existing pipe 50 removed to the outside is returned, post-processing such as backfilling the first shaft 52 and the second shaft 54 is appropriately performed, and the rehabilitation work of the existing tube 50 is completed.

この実施例によれば、押出成形されたときのままの形状を有する非縮径部12を更生管部材10の両端に形成したので、更生管部材10の端面の形状を均一に揃えることができる。したがって、更生管路に段差や薄肉部を生じること無く、更生管部材10の端面同士を容易に接続することができる。   According to this embodiment, since the non-reduced diameter portions 12 having the same shape as when extruded are formed at both ends of the rehabilitated pipe member 10, the shape of the end face of the rehabilitated pipe member 10 can be made uniform. . Therefore, the end surfaces of the rehabilitated pipe member 10 can be easily connected to each other without causing a step or a thin portion in the rehabilitated pipe line.

また、現場においてその端部を一旦円筒体に復元する等の端面の矯正を行うことなく、そのまま端面同士を接続することができるので、作業性が向上し、更生作業にかかる時間を短縮することができる。   In addition, the end faces can be connected as they are without correcting the end faces, such as once restoring the end to a cylindrical body at the site, improving workability and reducing the time required for rehabilitation work. Can do.

さらに、通常の管と同様に扱える短管状に更生管部材10を形成したので、長尺の管をドラム巻きにした状態では搬入の際に制約が生じる狭隘地にも更生管部材10を適用できる。   Furthermore, since the rehabilitated tube member 10 is formed in a short tubular shape that can be handled in the same manner as a normal tube, the rehabilitated tube member 10 can be applied to narrow spaces where restrictions are imposed during loading when a long tube is wound around a drum. .

なお、上述の実施例では、第1の更生管部材10の一方端を現場において縮径した後、既設管50内へ挿入するようにした。しかし、この部位は更生管部材10同士の接続には関係ないので、一方の端部のみに非縮径部を有する更生管部材を予め用意しておき、それを第1の更生管部材に用いるようにすれば、作業時間をより短縮できる。もちろん、これは最後尾の更生管部材にも当てはまる。   In the above-described embodiment, one end of the first rehabilitation pipe member 10 is reduced in diameter at the site, and then inserted into the existing pipe 50. However, since this part is not related to the connection between the rehabilitated pipe members 10, a rehabilitated pipe member having a non-reduced diameter portion only at one end is prepared in advance and used as the first rehabilitated pipe member. By doing so, the working time can be further shortened. Of course, this also applies to the last rehabilitation tube member.

また、上述の実施例では、押出機20によって断面円形の円筒管22を押し出すようにした、つまり非縮径形状として円筒形を採用したが、非縮径形状としては、既設管50の形状に応じて、楕円筒形や角筒形などを採用することもできる。この場合には、押出機20から押し出す管の断面形状を楕円形や角形にすればよい。   Further, in the above-described embodiment, the cylindrical tube 22 having a circular cross section is extruded by the extruder 20, that is, the cylindrical shape is adopted as the non-reduced shape, but the non-reduced shape is the shape of the existing tube 50. Depending on the case, an elliptical cylindrical shape or a rectangular cylindrical shape can be adopted. In this case, the cross-sectional shape of the tube extruded from the extruder 20 may be an ellipse or a square.

この発明の一実施例の更生管部材を示す側面図である。It is a side view which shows the rehabilitation pipe member of one Example of this invention. (a)は図1のII(A)-II(A)線における更生管部材の非縮径部の断面を示す断面図であり、(b)は図1のII(B)-II(B)線における更生管部材の縮径部の断面を示す断面図である。(a) is sectional drawing which shows the cross section of the non-reduced diameter part of the rehabilitation pipe member in the II (A) -II (A) line of FIG. 1, (b) is II (B) -II (B It is sectional drawing which shows the cross section of the reduced diameter part of the rehabilitation pipe member in a) line. 図1の更生管部材の成形方法の一例を示す図解図である。It is an illustration figure which shows an example of the shaping | molding method of the rehabilitation pipe member of FIG. 図1の更生管部材に規制具を取り付けた状態を示す側面図である。It is a side view which shows the state which attached the control tool to the rehabilitation pipe member of FIG. この発明に用いる加工装置の一例を示す図解図である。It is an illustration figure which shows an example of the processing apparatus used for this invention. 図5の加工装置を用いて非縮径部を縮径する様子を示す図解図であり、(A)は管受台に非縮径部をセットした状態を示し、(B)は非縮径部を縮径した状態を示す。It is an illustration figure which shows a mode that a non-reduced diameter part is diameter-reduced using the processing apparatus of FIG. 5, (A) shows the state which set the non-reduced diameter part to the pipe receptacle, (B) is a non-reduced diameter process. The state which reduced the diameter of the part is shown. 図1の更生管部材を用いて既設管を更生する最初の工程を示す図解図である。It is an illustration figure which shows the first process of renovating an existing pipe | tube using the renovated pipe member of FIG. 図1の更生管部材を用いて既設管を更生する他の工程を示す図解図である。It is an illustration figure which shows the other process of renovating an existing pipe | tube using the renovated pipe member of FIG. 図1の更生管部材を用いて既設管を更生するさらに他の工程を示す図解図である。It is an illustration figure which shows the further another process of renovating an existing pipe using the renovated pipe member of FIG. 図1の更生管部材を用いて既設管を更生する最後の工程を示す図解図である。It is an illustration figure which shows the last process of renovating an existing pipe | tube using the renovated pipe member of FIG.

符号の説明Explanation of symbols

10 …更生管部材
12 …非縮径部
14,14a,14b …縮径部
20 …押出機
22 …管
32 …加工装置
34 …チャンバ
36 …管受台
38 …押圧部
50 …既設管
56 …バット融着機
DESCRIPTION OF SYMBOLS 10 ... Rehabilitation pipe member 12 ... Non-diametered part 14, 14a, 14b ... Diameter-reduced part 20 ... Extruder 22 ... Pipe 32 ... Processing apparatus 34 ... Chamber 36 ... Pipe stand 38 ... Pressing part 50 ... Existing pipe 56 ... Butt Fusion machine

Claims (4)

両端に形成される非縮径部と前記非縮径部に挟まれた縮径部とを備える更生管部材を順次接続しながら既設管内に挿入していくことによって前記既設管を更生する管路更生方法であって、
(a)先行する更生管部材の非縮径部と後続する更生管部材の非縮径部とを接続し、
(b)前記ステップ(a)で接続した前記非縮径部を縮径加工し、
(c)前記ステップ(b)で前記非縮径部を縮径加工した前記更生管部材を前記既設管に所定距離挿入し、
(d)前記ステップ(a)から(c)のステップを繰り返して、前記既設管の更生部分の全長に亘って前記更生管部材を前記既設管に挿入し、そして
(e)前記ステップ(d)で前記既設管の更生部分の全長に亘って挿入した前記更生管部材を非縮径形状に復元させて、前記既設管内に更生管路を形成する、管路更生方法。
A conduit for rehabilitating the existing pipe by sequentially inserting a rehabilitated pipe member having a non-reduced diameter part formed at both ends and a reduced diameter part sandwiched between the non-reduced diameter parts into the existing pipe while sequentially connecting them. Rehabilitation method,
(A) connecting the non-reduced diameter part of the preceding rehabilitated pipe member and the non-reduced diameter part of the subsequent rehabilitated pipe member;
(B) reducing the diameter of the non-reduced portion connected in step (a);
(C) inserting the rehabilitated pipe member obtained by reducing the diameter of the non-reduced portion in the step (b) into the existing pipe by a predetermined distance;
(D) repeating steps (a) to (c) to insert the rehabilitated pipe member into the existing pipe over the entire length of the rehabilitated portion of the existing pipe; and (e) step (d) And rehabilitating the rehabilitated pipe member inserted over the entire length of the rehabilitated portion of the existing pipe to a non-reduced shape, thereby forming a rehabilitated pipe line in the existing pipe.
請求項1に記載の管路更生方法に用いられる更生管部材であって、
両端に形成される非縮径部、および
前記非縮径部に挟まれた縮径部を備える、更生管部材。
A rehabilitation pipe member used in the pipe line rehabilitation method according to claim 1 ,
A rehabilitated pipe member comprising a non-reduced diameter portion formed at both ends, and a reduced diameter portion sandwiched between the non-reduced diameter portions.
請求項1に記載の管路更生方法に用いられる更生管部材の製造方法であって、
(a)管を押出成形するステップ、および
(b)形状記憶温度で前記管を外面から軸方向に沿って押しつぶすようにして、所定長さの縮径部分を形成するステップを含む、更生管部材の製造方法。
It is a manufacturing method of the rehabilitation pipe member used for the pipe line rehabilitation method according to claim 1 ,
(A) extruding a tube; and (b) forming a reduced diameter portion of a predetermined length by crushing the tube along the axial direction from the outer surface at a shape memory temperature. Manufacturing method.
請求項1に記載の管路更生方法に用いられる更生管部材の非縮径部を縮径加工するための加工装置であって、
蒸気口および前記更生管部材を出し入れするための開口を有するチャンバ、
前記チャンバ内に設けられる管受台、および
上下動可能に前記チャンバ内に設けられて、下動したときに前記非縮径部を外面から押し込む押圧部を備える、加工装置。
A processing apparatus for reducing the diameter of a non-reduced portion of a rehabilitated pipe member used in the pipe rehabilitation method according to claim 1 ,
A chamber having a steam port and an opening for taking in and out the rehabilitation pipe member;
A processing apparatus comprising: a tube pedestal provided in the chamber; and a pressing portion that is provided in the chamber so as to be movable up and down and pushes the non-diameter-reduced portion from the outer surface when the chamber is moved downward.
JP2007130180A 2007-05-16 2007-05-16 Rehabilitation pipe member and pipe rehabilitation method Expired - Fee Related JP5008456B2 (en)

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