JP3539641B2

JP3539641B2 - Hanging body laying method

Info

Publication number: JP3539641B2
Application number: JP17576094A
Authority: JP
Inventors: 伸吉大岡
Original assignee: Obayashi Road Corp; Nippon Hume Corp
Current assignee: Obayashi Road Corp; Nippon Hume Corp
Priority date: 1994-07-27
Filing date: 1994-07-27
Publication date: 2004-07-07
Anticipated expiration: 2019-07-07
Also published as: JPH0841976A

Description

【０００１】
【産業上の利用分野】
本発明は光ファイバーケーブル等の懸吊体を下水管等の管渠内に敷設する管渠内への懸吊体敷設方法に関する。
【０００２】
【従来の技術】
光ファイバーケーブル等の敷設を既設の下水管、水道管等利用可能な様々な管渠を利用して行うことが提案され実施されている。
【０００３】
この敷設方法は管渠内を這せた光ファイバーケーブル等の懸吊体を管渠内に取り付けたフック等の固定金具によって懸吊支持するものである。固定金具は、管渠の内側頂部近傍に削孔によって孔を形成し、この孔に金具の一部を接着剤とともに嵌め込むことによって管渠に取付けられる。
【０００４】
しかし、この方法にあっては、管渠に削孔を施すことから例えばヒューム管からなる管渠を損傷したり、強度を低下させ弱体化を誘発するおそれがあり、特に老朽管である場合には、管渠の内面が剥落し、これによって漏水を誘発することがある。
【０００５】
この対策として出願人は、特願平６−４０９１２号によって拡径可能な筒状に巻かれたシート状の保持具本体を拡径して管渠内周面に押接した状態に維持することにより管渠内に保持具本体を固着し、保持具本体に設けた保持部に懸吊体を懸吊する管渠内への懸吊体敷設方法及び保持部にビニル管等の可撓性管を挿通して懸吊体を挿通案内させることにより懸吊体を保護することを提案した。
【０００６】
【発明が解決しようとする課題】
上記懸吊体敷設方法によると、拡径可能な筒状に巻かれたシート状の保持具本体を拡径して管渠内周面に押接して懸吊体保持具を管渠内に固定し、懸吊体保持具に設けられた保持部に懸吊体を懸吊することから、懸吊体の敷設に際して管渠への削孔が不要となり、管渠の損傷、弱体化が回避され、管渠が懸吊体保持具によって内側から補強される等の効果を有する。
【０００７】
しかし、懸吊体を保護するための保護管は、この保護管を挿通する保持部の内径と略等しい外径を有することから懸吊体保持具の保持部に挿通する作業は容易なものではなく、また予め各懸吊体保持具に設けられた環状の保持部に保護管を挿通し、各懸吊体保持具を拡開機に取付けて管渠内の設置位置に順次挿入して設置することから保護管と保持部との摺接によって保護管の損傷を招き、かつ懸吊体保持具の設置作業性、従って懸吊体敷設作業性向上の妨げとなる等の不具合がある。
【０００８】
従って、本発明の目的は、保護管の損傷及び懸吊体敷設作業性の向上が図り得る懸吊体敷設方法を提供することにある。
【０００９】
【課題を解決するための手段】
上記目的を達成する本発明の懸吊体敷設方法は、環状の保持部を具備する拡径可能な筒状に巻かれた保持具本体を有する複数の懸吊体保持具のこれら各保持部に拡径可能な断面形状の保護管を挿通するとともに、この保護管を管渠内に延設し、続いてこれら各懸吊体保持具を前記保護管に沿って順次管渠内に搬入し、次いで前記保持具本体を拡径して管渠内に設置することによって前記保護管を管渠内に懸吊し、この保護管を拡径し、拡径によって該保護管を各懸吊体保持具の保持部に固着し、しかる後、拡径され前記保持部に固着された前記保護管内に前記懸吊体を挿通するものである。
【００１０】
【実施例】
以下、本発明における懸吊体敷設方法の一実施例を懸吊体が光ファイバーケーブルの場合を例に図によって説明する。
【００１１】
図１は、本実施例に用いられる懸吊体保持具１の斜視図であって、この懸吊体保持具１は、環状弾性体２と、環状の保持部３を有する保持具本体４とにより構成されている。
【００１２】
環状弾性体２は、略円形の断面形状或いは山形形状等適宜形状の断面形状を有する水膨潤性材料によってＯ−リング状に形成されている。一方保持具本体４は、ステンレス、銅、銅合金のように耐食性を有する金属材料製であって、弾性変形可能な細長いシート状のベース部４ａを有し、一端部４ｂが他端部４ｃの内側となるように筒状、即ち渦巻状に変形された後、複数の、本実施例では４本の環状弾性体２の内側に配置される。
【００１３】
また保持具本体４のベース部４ａの一端部４ｂ側には所定寸法隔てて複数の係止穴４ｄが列設され、他端部４ｃ側には前記係止穴４ｄに係止可能な係止片（図示せず）が切起し加工によりベース部４ａの内方へ突出するように形成され、これら係止穴４ｄと係止片とにより保持具本体４を拡径した状態に維持する係止部を構成している。そしてベース部４ａの一端部４ｂの近傍内側に揺動可能或いは固定的に環状の保持部３が設けられている。
【００１４】
次に、このように形成された懸吊体保持具１を用いて管渠内に光ファイバーケーブルを敷設する懸吊体敷設方法を説明する。
【００１５】
図２において符号５は光ファイバーケーブル６を敷設すべきヒューム管等で形成されている既設管渠である。敷設に先行して管内洗浄車等により管渠５の内周面５ａを洗浄し、必要に応じてこの内周面５ａを削孔機等によって削り、形状を整える。
【００１６】
次に管渠５の一端側において、管渠５内に設置すべき複数の上記懸吊体保持具１の保持部３内に光ファイバーケーブル６を被覆する保護管７を挿通し、管渠５内に延設する。保持部３内に挿通する保護管７は、熱硬化性樹脂製であって、図３にその挿通断面を示すように断面略Ｕ字形に折り畳まれた変形環状である。
【００１７】
続いて、図４に示すように各懸吊体保持具１を順次管渠５内の設置位置に搬入して設置する。懸吊体保持具１の設置は、懸吊体保持具１の保持具本体４の内側に拡開機（図示せず）を挿入して拡開機に懸吊体保持具１を装着し、管渠５内の設置箇所まで拡開機に連結されたロープを管渠５の他端部側へ引き寄せ、設置箇所において、拡開機により懸吊体保持具１の保持具本体４を拡径させて環状弾性体２を管渠５の内周面５ａに押圧させて圧縮変形し、かつベース部４ａに形成された係止穴４ｄと係止片とを係合することによってなされ、この作業を繰返して図４に示すように管渠５内に断面Ｕ字形の保護管７を各懸吊体保持具１の保持部３によって懸吊保持する。
【００１８】
次に保護管７の一端を密閉し、他端から保護管７内に圧縮空気或いは水圧を供給し、これら流体圧によって図３に一点鎖線７′で示す保持部３の内周面３ａに圧接するまで保護管７を拡径させる。
【００１９】
続いて保護管７が拡径した状態下で、管渠５内を移動する加熱装置（図示せず）、或いは水を循環加熱する等適宜手段によって保護管７を加熱して硬化させて保護管７を管渠５内の各懸吊体保持具１によって固定的に設置する。
【００２０】
しかる後、圧縮空気、温水等を排除し、管渠５内に保持された保護管７内に光ファイバーケーブル６を挿入して光ファイバーケーブル６を管渠５内に敷設する。
【００２１】
また、上記圧縮空気及び水圧に代えて懸吊体保持具１の保持部３によって懸吊された断面Ｕ字形の保護管７内に加熱流体、例えば温水或いは加熱蒸気を加圧注入して保護管７を拡径させるとともに加熱硬化させて作業の簡素化を得ることも可能である。
【００２２】
更に他の保護管７の拡径方法としては、図５に説明斜視図を示すように、予め断面Ｕ字形の保護管７内にワイヤ８ａを挿通し、懸吊体保持具１の保持部３によって上記同様管渠５内に保護管７を懸吊保持した後、ワイヤ８ａを牽引してワイヤ８ａに連結された拡径すべき径を有する、加熱手段を有する例えば砲弾形のピグ８を移動せしめることにより、保護管７を押し拡げ、拡径するとともに加熱硬化せしめて保護管７を敷設する方法もある。この場合拡径に従って、拡径された保護管７内に圧縮空気を供給して所定時間拡径状態に保持し、充分に硬化した後、光ファイバーケーブル６を保護管７内に挿入して光ファイバーケーブル６を敷設することが好ましい。
【００２３】
上記実施例では、熱硬化性樹脂製の保護管を用いた例について説明したが、次に熱可塑性樹脂製の保護管９を用いた場合について説明する。
【００２４】
上記実施例同様管渠５の一端側において管渠５内に設置すべき複数の懸吊体保持具１の保持部３内に熱可塑性樹脂製で断面略Ｕ字形の変形管からなる保護管９を挿通し、管渠５内に延設する。
【００２５】
続いて各懸吊体保持具１を順次管渠５内の設置位置に搬入して設置して図４に示すように管渠５内に保護管９を懸吊保持する。
【００２６】
次に保護管９の一端を密閉し、他端から保護管９内に高温の圧縮空気、高温の加熱蒸気或いは温水を圧力供給し、これら液体圧によって図３に一点鎖線９′で示すように保持部３の内周面３ａに圧接して断面略円形になるまで保護管９を拡径する。
【００２７】
続いて保護管９が拡径した状態で圧縮空気、蒸気或いは温水を冷却させ、あるいは冷却するまで保持して保護管９を硬化させて保護管９を管渠５内の各懸吊体保持具１によって固定的に設置する。
【００２８】
しかる後、圧縮空気、温水等を保護管９内から排出し、管渠５内に保持された保護管９内に光ファイバーケーブルを挿入して光ファイバーケーブル６を管渠５内に敷設する。
【００２９】
他の保護管９の拡径方法としては、図６に要部説明斜視図を示すように、予め断面Ｕ字形の保護管９内にワイヤ８ａを挿入し、前記実施例同様懸吊体保持具１の保持部３によって管渠５内に保護管９を懸吊保持した後、ワイヤ８ａを牽引してワイヤ８ａに連結された拡径すべき径を有し、加熱手段を有する砲弾形のピグ８を移動せしめることにより保護管９を加熱して押し拡げ、かつピグ８によって拡径された保護管９内に圧縮空気、冷却水等を供給して所定時間拡径状態を保持し、充分に冷却硬化した後、光ファイバーケーブル６を保護管９内に挿通して光ファイバーケーブル６を敷設する。
【００３０】
以上説明では熱硬化性樹脂及び熱可塑性樹脂製の保護管を使用したが、金属製の保護管を用いることも可能である。
【００３１】
この方法は、上記実施例同様、管渠の一端側において複数の懸吊体保持具の保持部内に断面略Ｕ字形の変形鋼管からなる保護管を挿通し、かつ管渠内に延設する。次に各懸吊体保持具を順次管渠内に搬入設置して管渠内に保護管を懸吊保持する。
【００３２】
続いて保護管の一端を密閉して他端から保護管内に流体圧、例えば水圧を供給し、保護管を拡径させる。或いは予め保護管内にワイヤを挿通して懸吊体保持具の保持部によって管渠内に保護管を懸吊保持した後、ワイヤを牽引してワイヤに連結されたピグを移動せしめ、保護管を押し拡げて拡径したしかる後、光ファイバーケーブルを保護管内に挿通して光ファイバーケーブルを敷設することによってなされる。
【００３３】
上記各実施例として光ファイバーケーブルを敷設する場合を例に説明したが、電線、ガス管等他の懸吊体を敷設することも可能であり、懸吊体保持具の保持部に挿入する保護管は、断面略Ｕ字形に限定することなく、例えば図７（ａ），（ｂ）に示すような多角形或いは他の拡径可能な断面形状を有する変形管によって構成することも可能である。
【００３４】
【発明の効果】
以上説明した本発明による懸吊体敷設方法によれば、複数の懸吊体保持具の各保持部に拡径可能な断面形状の保護管を挿通し、かつこの保護管を管渠内に延設し、各懸吊体保持具を保護管に沿って順次管渠内に搬入設置し、しかる後保護管を拡径して各懸吊体保持具の保持部に固着懸吊体保持具の各保持部に保護管を挿通する際、及び懸吊体保持具を管渠内に搬入する際、保護管と保持部との間に間隙を有した状態で行うことが可能になり、保持部への保護管の挿通及び懸吊体保持具の管渠内への搬入が容易になり、かつ保護管と保持部との摺接乃至摩擦による保護管及び懸吊体保持具、特に保持部の損傷が回避され懸吊体敷設作業性の向上が得られる。
【図面の簡単な説明】
【図１】本発明による懸吊体敷設方法の一実施例に使用する懸吊体保持具の説明斜視図である。
【図２】本実施例における懸吊体敷設方法を説明する要部断面説明図である。
【図３】同じく、懸吊体敷設方法を説明する要部断面説明図である。
【図４】同じく、懸吊体敷設方法を説明する要部断面説明図である。
【図５】同じく、懸吊体敷設方法を説明する要部断面斜視図である。
【図６】同じく、懸吊体敷設方法を説明する要部断面斜視図である。
【図７】同じく、懸吊体敷設方法に用いられる保護管を説明する断面図である。
【符号の説明】
１懸吊体保持具
３保持部
４保持具本体
５管渠
６懸吊体
７保護管
８ピグ
９保護管[0001]
[Industrial applications]
The present invention relates to a method for laying a suspension body in a conduit such as a sewer pipe in which a suspension such as an optical fiber cable is laid.
[0002]
[Prior art]
It has been proposed and practiced to lay optical fiber cables and the like using various available sewers such as existing sewer pipes and water pipes.
[0003]
In this laying method, a suspension body such as an optical fiber cable laid in a conduit is suspended and supported by a fixing fitting such as a hook attached to the conduit. The fixing bracket is attached to the sewer by forming a hole by drilling in the vicinity of the inner top portion of the sewer, and fitting a part of the fitting into the hole together with an adhesive.
[0004]
However, in this method, since drilling is performed on the sewer, for example, there is a risk that the sewer composed of fume pipes may be damaged, or the strength may be reduced and weakening may be induced. In some cases, the inner surface of the sewer flakes off, which can cause water leakage.
[0005]
Applicant As a countermeasure, keeping the state of being pressed against the tube culvert inner peripheral surface diametrically enlarged the sheet-shaped holder main body wound around the expandable tubular by Japanese Patent Application No. 6-409 1 2 No. The method of laying the suspension body in the culvert in which the suspension body is suspended in the holding part provided in the holder body by fixing the holder body in the pipe It was proposed to protect the suspension by inserting the sex tube and guiding the suspension through.
[0006]
[Problems to be solved by the invention]
According to the above suspension body laying method, the diameter of the sheet-shaped holder body wound into a tubular shape that can be expanded is expanded and pressed against the inner peripheral surface of the sewer to fix the suspended body holder in the sewer. However, since the suspension is hung on the holding portion provided on the suspension holder, drilling of the sewer becomes unnecessary when the suspension is laid, and damage and weakening of the sewer are avoided. In addition, there is an effect that the sewer is reinforced from the inside by the suspension holder.
[0007]
However, since the protective tube for protecting the suspension has an outer diameter substantially equal to the inner diameter of the holder through which the protective tube is inserted, it is not easy to insert the protective tube into the holder of the suspension holder. In addition, a protection tube is inserted into an annular holding portion provided in advance in each suspension holder, and each suspension holder is attached to a spreader, and is sequentially inserted and installed at an installation position in a sewer. Therefore, the sliding contact between the protection tube and the holding portion may cause damage to the protection tube, and may hinder the improvement of the workability of installing the suspension holder, and thus the work of laying the suspension.
[0008]
Accordingly, an object of the present invention is to provide a suspension laying method capable of improving the protection pipe damage and the workability of laying the suspension.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the suspension laying method of the present invention includes a plurality of suspension holders each having a holder main body wound in a tubular shape having an annular holding portion and having an expandable diameter. with inserting the protective tube of expandable cross-sectional shape, it carried the protective tube is extended into the Kanmizo, followed sequentially within the tube culvert along the respective suspension member retainer to the protective tube, then the protective tube is suspended within Kanmizo by placing into the tube culvert and expanded the holder main body, and expanded the protective tube, the suspended body holding the protective tube by expanded fixed to the holding portion of the jig, thereafter, in which a larger diameter is inserted through the suspension member to the protective tube secured to the holding portion.
[0010]
【Example】
Hereinafter, an embodiment of the suspension laying method according to the present invention will be described with reference to the drawings, taking the case where the suspension is an optical fiber cable as an example.
[0011]
FIG. 1 is a perspective view of a suspension holder 1 used in this embodiment. The suspension holder 1 includes an annular elastic body 2 and a holder main body 4 having an annular holder 3. It consists of.
[0012]
The annular elastic body 2 is formed in an O-ring shape from a water-swellable material having an appropriate cross-sectional shape such as a substantially circular cross-sectional shape or a chevron shape. On the other hand, the holder body 4 is made of a corrosion-resistant metal material such as stainless steel, copper, or a copper alloy, and has an elongated sheet-like base portion 4a that can be elastically deformed. After being deformed into a cylindrical shape, that is, a spiral shape so as to be inside, it is arranged inside a plurality of, in this embodiment, four, annular elastic bodies 2.
[0013]
A plurality of locking holes 4d are arranged in a row at a predetermined distance from one end 4b of the base portion 4a of the holder main body 4 and locking is provided at the other end 4c on the side of the locking hole 4d. A piece (not shown) is formed so as to protrude inwardly of the base portion 4a by cutting and raising, and is used to maintain the holder main body 4 in an expanded state by the locking holes 4d and the locking pieces. Constitutes a stop. An annular holding portion 3 is swingably or fixedly provided inside the vicinity of one end portion 4b of the base portion 4a.
[0014]
Next, a method of laying a suspension body for laying an optical fiber cable in a pipe using the suspension holder 1 thus formed will be described.
[0015]
In FIG. 2, reference numeral 5 denotes an existing sewer formed of a fume pipe or the like on which the optical fiber cable 6 is to be laid. Prior to the laying, the inner peripheral surface 5a of the conduit 5 is cleaned by a pipe washing vehicle or the like, and if necessary, the inner peripheral surface 5a is shaved by a drilling machine or the like to adjust the shape.
[0016]
Next, at one end of the sewer 5, a protective tube 7 covering the optical fiber cable 6 is inserted into the holding portions 3 of the plurality of suspension holders 1 to be installed in the sewer 5, To be extended. The protection tube 7 inserted into the holding portion 3 is made of a thermosetting resin, and has a deformed annular shape that is folded in a substantially U-shaped cross section as shown in FIG.
[0017]
Subsequently, as shown in FIG. 4, each suspension holder 1 is sequentially carried into the installation position in the duct 5 and installed. The suspension holder 1 is installed by inserting a spreader (not shown) inside the holder main body 4 of the suspension holder 1 and mounting the suspension holder 1 on the spreader. The rope connected to the spreader is pulled toward the other end side of the sewer 5 to the installation location in 5, and at the installation location, the diameter of the holder main body 4 of the suspension holder 1 is expanded by the expander to make the ring elastic. The body 2 is pressed against the inner peripheral surface 5a of the sewer 5 to be compressed and deformed, and is engaged by engaging a locking hole 4d formed in the base portion 4a with a locking piece. As shown in FIG. 4, a protection tube 7 having a U-shaped cross section is suspended and held in the sewer 5 by the holding portion 3 of each suspension holder 1.
[0018]
Next, one end of the protection tube 7 is sealed, and compressed air or water pressure is supplied into the protection tube 7 from the other end, and the fluid pressure is pressed against the inner peripheral surface 3a of the holding portion 3 indicated by a dashed line 7 'in FIG. Until the diameter of the protective tube 7 is increased.
[0019]
Subsequently, in a state where the diameter of the protective tube 7 is expanded, the protective tube 7 is heated and hardened by a heating device (not shown) moving in the conduit 5 or by an appropriate means such as circulating and heating water. 7 is fixedly installed by each suspension holder 1 in the sewer 5.
[0020]
Thereafter, the compressed air, hot water and the like are eliminated, and the optical fiber cable 6 is inserted into the protective tube 7 held in the sewer 5 to lay the optical fiber cable 6 in the sewer 5.
[0021]
Also, instead of the compressed air and the water pressure, a heating fluid, for example, hot water or heated steam, is injected under pressure into a protection tube 7 having a U-shaped cross section suspended by the holding portion 3 of the suspension holder 1 to protect the protection tube. It is also possible to simplify the work by expanding the diameter of 7 and hardening it by heating.
[0022]
As another method of expanding the diameter of the protection tube 7, as shown in an explanatory perspective view of FIG. 5, a wire 8a is inserted into the protection tube 7 having a U-shaped cross section in advance, and the holding portion 3 of the suspension holder 1 is held. After the protective tube 7 is suspended and held in the sewer 5 in the same manner as described above, the wire 8a is pulled to move, for example, a bullet-shaped pig 8 having a heating means and having a diameter to be expanded and connected to the wire 8a. There is also a method in which the protective tube 7 is laid by pushing and expanding the protective tube 7, expanding the diameter, and curing by heating. In this case, according to the diameter expansion, compressed air is supplied into the expanded protective tube 7 to maintain the expanded state for a predetermined time, and after sufficiently hardened, the optical fiber cable 6 is inserted into the protective tube 7 and the optical fiber cable is inserted. 6 is preferably laid.
[0023]
In the above embodiment, an example using a thermosetting resin protective tube is described. Next, a case using a thermoplastic resin protective tube 9 will be described.
[0024]
In the same manner as in the above embodiment, a protective tube 9 made of a thermoplastic resin and having a substantially U-shaped cross section is provided in the holding portion 3 of the plurality of suspension holders 1 to be installed in the sewer 5 at one end of the sewer 5. And extend into the sewer 5.
[0025]
Subsequently, the suspension holders 1 are sequentially carried into the installation position in the sewer 5 and installed, and the protection tube 9 is suspended and held in the sewer 5 as shown in FIG.
[0026]
Next, one end of the protection tube 9 is sealed, and high-pressure compressed air, high-temperature heating steam or hot water is supplied into the protection tube 9 from the other end by pressure. As shown by a dashed line 9 'in FIG. The diameter of the protection tube 9 is expanded until the cross section becomes substantially circular by pressing against the inner peripheral surface 3 a of the holding portion 3.
[0027]
Subsequently, in a state where the diameter of the protective tube 9 is expanded, the compressed air, steam or hot water is cooled, or the compressed tube is hardened by cooling until cooled, and the protective tube 9 is hardened so that the protective tube 9 is held in each hanging member in the sewer 5. 1 fixedly installed.
[0028]
Thereafter, the compressed air, hot water and the like are discharged from the inside of the protection pipe 9, and an optical fiber cable is inserted into the protection pipe 9 held in the pipe 5, and the optical fiber cable 6 is laid in the pipe 5.
[0029]
As another method of expanding the diameter of the protective tube 9, as shown in a perspective view of a main part in FIG. 6, a wire 8a is inserted into the protective tube 9 having a U-shaped cross section in advance, and a suspension holder After the protective tube 9 is suspended and held in the culvert 5 by the holding portion 3, the wire 8a is pulled and connected to the wire 8a. By moving the protective tube 9, the protective tube 9 is heated and expanded, and compressed air, cooling water, etc. are supplied into the protective tube 9 expanded by the pig 8 to maintain the expanded state for a predetermined time, and After cooling and curing, the optical fiber cable 6 is inserted into the protection tube 9 and the optical fiber cable 6 is laid.
[0030]
In the above description, a protection tube made of a thermosetting resin or a thermoplastic resin is used, but a protection tube made of a metal may be used.
[0031]
In this method, as in the above-described embodiment, a protection tube made of a deformed steel pipe having a substantially U-shaped cross section is inserted into the holding portion of a plurality of suspension holders at one end of the culvert and extends into the culvert. Next, the suspension holders are sequentially carried into and installed in the sewer, and the protection tube is suspended and held in the sewer.
[0032]
Subsequently, one end of the protection tube is sealed, and a fluid pressure, for example, a water pressure is supplied into the protection tube from the other end to expand the diameter of the protection tube. Alternatively, after inserting the wire in advance into the protective tube and suspending and holding the protective tube in the sewer by the holding portion of the suspension holder, the wire is pulled to move the pig connected to the wire, and the protective tube is moved. After pushing and expanding the diameter, the optical fiber cable is inserted into the protective tube to lay the optical fiber cable.
[0033]
Although the case where the optical fiber cable is laid has been described as an example in each of the above embodiments, it is also possible to lay other hanging bodies such as electric wires and gas pipes, and a protection tube inserted into the holding portion of the hanging body holder. Is not limited to a substantially U-shaped cross section, but may be constituted by, for example, a deformed tube having a polygonal shape as shown in FIGS. 7A and 7B or another cross-sectional shape capable of expanding in diameter.
[0034]
【The invention's effect】
According to the suspension laying method according to the present invention described above, a protective tube having an expandable cross-sectional shape is inserted into each holding portion of the plurality of suspension holders, and the protective tube is extended into the sewer. , Each suspension holder is sequentially carried into the sewer along the protection tube, and then the diameter of the protection tube is expanded and fixed to the holder of each suspension holder. When inserting the protection tube into each holding portion and when bringing the suspension holder into the sewer, it is possible to perform the process with a gap between the protection tube and the holding portion, It is easy to insert the protection tube into the pipe and to carry the suspension holder into the sewer, and to secure the protection tube and the suspension holder, especially the holder, by sliding or friction between the protection tube and the holder. Damage is avoided, and workability of hanging body laying is improved.
[Brief description of the drawings]
FIG. 1 is an explanatory perspective view of a suspension holder used in an embodiment of a suspension laying method according to the present invention.
FIG. 2 is an explanatory cross-sectional view of a main part, illustrating a method of laying a suspension according to the present embodiment.
FIG. 3 is an explanatory cross-sectional view of a main part, similarly illustrating a method of laying a suspension body.
FIG. 4 is an explanatory sectional view of a main part for explaining a method of laying a suspension.
FIG. 5 is a cross-sectional perspective view of an essential part for explaining a method of laying a suspension.
FIG. 6 is a cross-sectional perspective view of an essential part for explaining a method of laying a suspension.
FIG. 7 is a cross-sectional view illustrating a protective tube used in the method of laying a suspension.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Suspension body holder 3 Holder 4 Holder body 5 Sewer 6 Suspension body 7 Protection tube 8 Pig 9 Protection tube

Claims

A plurality of suspension body holders having a holder body wound in a tubular shape having an annular holding portion and having a diameter that can be expanded are inserted into the respective holding portions of the protection tubes having a cross-sectional shape that can be expanded. installing a protection tube is extended into the Kanmizo, then loaded into the sequential tube culvert along the respective suspension member retainer to the protective tube, and then the holder main body to be upset inner tube culvert Then, the protective tube is suspended in a sewer, and the diameter of the protective tube is expanded. By maintaining the expanded state, the protective tube is fixed to the holding portion of each suspension holder. A method of laying the suspension body, wherein the suspension body is inserted into the protection tube having an enlarged diameter and fixed to the holding portion .

2. The method of laying a suspension according to claim 1, wherein the cross-sectional shape of the protection tube that can be expanded is a deformed ring having a substantially U-shaped cross section.

Protective tube is a thermosetting resin, by a fluid pressure of the pressurized fluid supplied to the protective tube and expanded the protective tube, the other being introduced into the protective tube that is thermally or expanded exerted by the fluid The suspension laying method according to claim 1 or 2, wherein the resin is cured by heat applied by a heating device, and the expanded protection tube is fixed to the holding portion .

The protective tube is made of a thermosetting resin, and the diameter of the protective tube is increased by pulling a bullet-shaped pig having a heating means through the protective tube to expand the diameter of the protective tube and curing the resin by the heat given by the pig. The suspension laying method according to claim 1 or 2, wherein the suspension is fixed to the holding portion .

The protection tube is a thermoplastic resin, and the protection tube is heated and expanded by a pressurized fluid supplied into the protection tube, and then the protection tube is cooled and cured to be fixed to the holding portion. Or the method of laying the suspension of 2.

The protection tube is a thermoplastic resin, and a pig having a heating means is moved in the protection tube to heat and spread the protection tube, and a pressurized fluid for cooling is supplied into the protection tube expanded by the pig. The suspension laying method according to claim 1 or 2, wherein the protective tube is cured while maintaining the expanded state of the protective tube.

The protection tube is a metal tube having a cross-sectional shape that can be expanded in diameter, wherein the diameter of the protection tube is expanded by a pig pulled inside the protection tube, and the expanded metal tube is fixed to the protection tube. How to lay a suspended body.