JP2020018076A - Protective tube, manufacturing method of protective tube, and components of protective tube - Google Patents

Protective tube, manufacturing method of protective tube, and components of protective tube Download PDF

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JP2020018076A
JP2020018076A JP2018138924A JP2018138924A JP2020018076A JP 2020018076 A JP2020018076 A JP 2020018076A JP 2018138924 A JP2018138924 A JP 2018138924A JP 2018138924 A JP2018138924 A JP 2018138924A JP 2020018076 A JP2020018076 A JP 2020018076A
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curved surface
curved
shaped
protective tube
shaped member
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JP7142346B2 (en
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啓 岡添
Kei Okazoe
啓 岡添
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Okazoe Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables

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Abstract

To provide a protective tube having a low manufacturing cost and a high degree of freedom in shape.SOLUTION: A protective tube is formed by an outer peripheral side curved surface and a two-sided curved surface 23 obtained by bending both sides of the outer peripheral side curved surface so that the cross-section has an U-shape, and includes a U-shaped member 24 that extends while maintaining the U-shape and has at least a curved portion 20 that extends and curves in a direction intersecting the outer peripheral side curved surface, and an inner peripheral side curved surface 25 coupled to an open end of the U-shaped member so as to cover the open side of the U-shape. Each side curved surface of the U-shaped member is provided at a position where at least one notch faces between the two-sided curved surfaces, the notch is cut from the open end of the U-shaped member such that the boundary between the outer peripheral side curved surface and the two-sided curved surface is an endpoint in each sided curved surface, and the curved portion is formed by curving the outer peripheral side curved surface around an imaginary line connecting the endpoint of the notch facing each other between the two-sided curved surfaces.SELECTED DRAWING: Figure 2

Description

本発明は、高圧ケーブルのような電線を防護する防護管、その製造方法および防護管の部品に関する。   The present invention relates to a protective tube for protecting an electric wire such as a high-voltage cable, a method for manufacturing the same, and components of the protective tube.

従来から、電線を防護するための防護管がある。このような防護管は、電線が挿通されて、通された電線を降雨等による風化や、外部からの物質の飛散等による損傷から保護する。そのような、防護管として、特許文献１に記載のような金属線ぴがある。特許文献１には、断面がロ字形状、すなわち矩形の金属筒を防護管として、その筒の中に電線を挿通して保護している。特許文献１の防護管は、他の配管等との干渉を避けるために、防護管が、湾曲した湾曲部を有する。   Conventionally, there is a protective tube for protecting an electric wire. Such a protection tube protects the inserted electric wire from being damaged by weathering due to rainfall or the like or scattering of a substance from the outside when the electric wire is inserted. As such a protective tube, there is a metal wire の as described in Patent Document 1. In Patent Literature 1, a metal tube having a rectangular cross section, that is, a rectangular metal tube is used as a protective tube, and an electric wire is inserted into the tube to protect the tube. In the protection pipe of Patent Document 1, the protection pipe has a curved portion in order to avoid interference with other pipes or the like.

また、他の防護管として、鉄道軌道の付近に配設され、電車に電力を供給するための高圧ケーブルのような電線を挿通する防護管がある。このような防護管は、電車が軌道を通過する際などに、軌道周辺の敷石が飛散して高圧ケーブルが損傷しないように、ロ字形状の断面を有する金属製の筒から構成されるものがある。この防護管は、高圧ケーブルの立ち上げに対応して、地上から上方に立ち上がるように湾曲する湾曲部を有する。   Further, as another protection pipe, there is a protection pipe which is disposed near a railway track and through which an electric wire such as a high-voltage cable for supplying electric power to a train is inserted. Such a protective tube is formed of a metal tube having a square cross section so that the paving stones around the track are not scattered when the train passes through the track and the high-voltage cable is not damaged. is there. The protective tube has a curved portion that rises upward from the ground in response to the rise of the high-voltage cable.

湾曲部を有するこれらの防護管は、従来、真っ直ぐに形成された筒に冶具等を用いつつ、大きな力を加えて強制的に湾曲させる等の方法により形成される。   Conventionally, these protective tubes having a curved portion are formed by a method of forcibly bending a straight tube by applying a large force while using a jig or the like.

特開平８−１８６９１９号公報JP-A-8-186919

しかし、真っ直ぐに形成された筒に冶具等を用いつつ、大きな力を加えて強制的に湾曲させるような方法で保護管を作成することとした場合、冶具により湾曲部の曲率の大きさが規定されてしまう。そのため、湾曲部における曲率の異なる保護管を作成しようとすると、曲率のバリエーション分の冶具を用意する必要がある。また、冶具により強制的に管を曲げ加工して保護管を作成する場合には、湾曲部における曲率等の精度に限界がある。そのため、従来の製造方法では、曲率等の寸法精度の高い保護管を作成できないという問題があった。   However, when using a jig or the like in a straight tube and applying a large force to forcibly bend the protective tube, the size of the curvature of the curved part is specified by the jig. Will be done. Therefore, when trying to create protective tubes having different curvatures in the curved portion, it is necessary to prepare jigs for variations in the curvature. Further, when a protective tube is formed by forcibly bending a tube with a jig, there is a limit in accuracy such as curvature in a curved portion. Therefore, the conventional manufacturing method has a problem that a protective tube having high dimensional accuracy such as curvature cannot be formed.

また、上述した直管を曲げ加工する方法以外に考えられる保護管の製造方法として、プレス加工による方法が考えられる。しかしながら、プレス加工による場合には、防護管の形状に応じて金型を用意する必要がある。そのため、プレス加工を採用して種々の形状の防護管を製造するためには、対応する数の金型が必要となり、金型の製作費用が膨大になるといった課題があった。また、金型の設計においては、例えば、湾曲部の曲率を一定以下にできないといったように、防護管の形状に制限があった。特に、高圧ケーブルのように太い電線を防護する場合には、防護管も大型となり、防護管を湾曲させることがより困難な場合が多かった。   In addition, as a method of manufacturing a protective tube other than the above-described method of bending a straight pipe, a method by press working can be considered. However, in the case of press working, it is necessary to prepare a mold according to the shape of the protective tube. Therefore, in order to manufacture protective tubes of various shapes by employing press working, a corresponding number of dies are required, and there has been a problem that the manufacturing cost of the dies becomes enormous. In the design of the mold, the shape of the protective tube is limited, for example, such that the curvature of the curved portion cannot be reduced below a certain value. In particular, when protecting a thick electric wire such as a high-voltage cable, the size of the protective tube is large, and it is often difficult to bend the protective tube.

本発明は、上記のような課題に鑑み、製造コストが安価で、かつ形状の自由度が高い防護管を提供することを目的とする。   The present invention has been made in view of the above problems, and has as its object to provide a protective tube having a low manufacturing cost and a high degree of freedom in shape.

（１）本発明に係る防護管は、中空の筒状に形成され、中空部に挿通された他部材を防護するものであって、所定の曲率半径で湾曲した湾曲部を有し、前記湾曲部が、前記曲率半径方向の外周側をなす外周側湾曲面と、前記曲率半径方向の内周側をなす内周側湾曲面と、前記外周側湾曲部及び内周側湾曲部の中間部をなし、対向するように配置された一対の側方湾曲面とを有し、前記一対の側方湾曲面は、それぞれ前記曲率半径方向の一端側において前記外周側湾曲部あるいは前記内周側湾曲部に対して境界部を介して屈曲しつつ連続するように形成され、他端側が開放端とされると共に、前記開放端側から前記境界部が終点となるように切り込まれた切込を有し、前記切込が、前記一対の側方湾曲面の間で対向する位置に設けられ、前記外周側湾曲面あるいは前記内周側湾曲面のうち、前記終点に続くように設けられた面が、前記側方湾曲面の間で対向する前記切込の前記終点を相互に結ぶ仮想線を軸として前記所定の曲率半径で湾曲するように屈曲されていることを特徴とするものである。   (1) A protection tube according to the present invention is formed in a hollow cylindrical shape and protects another member inserted into the hollow portion, and has a curved portion curved with a predetermined radius of curvature. Part, an outer peripheral side curved surface forming an outer peripheral side in the radius of curvature direction, an inner peripheral side curved surface forming an inner peripheral side in the radius of curvature direction, and an intermediate portion between the outer peripheral side curved portion and the inner peripheral side curved portion. None, a pair of side curved surfaces disposed so as to face each other, and the pair of side curved surfaces are each one of the outer peripheral side curved portion or the inner peripheral side curved portion on one end side in the radius of curvature direction. Has a notch formed so as to be bent and continuous with a boundary portion therebetween, the other end side being an open end, and being cut from the open end side so that the boundary portion is an end point. The notch is provided at a position facing between the pair of side curved surfaces, and Of the side curved surface or the inner peripheral side curved surface, a surface provided so as to follow the end point has an axis around an imaginary line connecting the end points of the cuts facing each other between the side curved surfaces. It is characterized by being bent so as to be curved at the predetermined radius of curvature.

この防護管では、一対の側方湾曲面がそれぞれ一端側において外周側湾曲部あるいは内周側湾曲部に対して境界部を介して屈曲しつつ連続するように形成された、樋状の部材が用いられる。この樋状の部材において、側方湾曲面に設けられた切込は、外周側湾曲面あるいは内周側湾曲面付近まで及ぶように設けられている。また、前述の樋状の部材は、切込の終点を軸に外周側湾曲面あるいは内周側湾曲面を湾曲させることにより、一対の側方湾曲面、及びこれらに続くように形成された外周側湾曲面あるいは内周側湾曲面を一体的に湾曲させたたものである。本発明の防護管は、このような樋状の部材に対し、外周側湾曲面あるいは内周側湾曲面の他方側をなす部材を組み合わせることにより形成されている。そのため、本発明の保護管は、従来技術のように直管を曲げ加工により強制的に曲げたり、プレス加工等することなく製造できる。また、本発明の保護管は、切込を設ける位置や数等を調整することにより、湾曲部の曲率や大きさ等を自由かつ寸法精度良く調整できる。従って、本発明によれば、製造コストが安価でかつ形状の自由度が高い防護管を提供することができる。   In this protective tube, a gutter-shaped member formed such that a pair of side curved surfaces are formed so as to be continuous at one end side thereof while being bent through a boundary portion with respect to an outer curved portion or an inner curved portion, respectively. Used. In this gutter-shaped member, the cut provided in the side curved surface is provided so as to extend to the vicinity of the outer curved surface or the inner curved surface. In addition, the above-mentioned gutter-shaped member has a pair of side curved surfaces and an outer periphery formed to follow these by bending the outer curved surface or the inner curved surface around the end point of the cut. The side curved surface or the inner peripheral side curved surface is integrally curved. The protection tube of the present invention is formed by combining such a gutter-shaped member with a member that forms the other side of the outer curved surface or the inner curved surface. Therefore, the protective tube of the present invention can be manufactured without forcibly bending a straight tube by bending, pressing, or the like as in the prior art. In the protective tube of the present invention, the curvature, the size, and the like of the curved portion can be adjusted freely and with high dimensional accuracy by adjusting the position and number of the cuts. Therefore, according to the present invention, it is possible to provide a protective tube having a low manufacturing cost and a high degree of freedom in shape.

（２）前記した防護感は、前記外周側湾曲面及び前記内周側湾曲面のいずれか一方と、一対の側方湾曲面とにより、断面がコ字形状となるように形成されたコ字状部材と、前記外周側湾曲面及び前記内周側湾曲面の他方を備え、前記コ字状部材において前記一対の側方湾曲面の開放端側を閉塞する蓋部材とを備えているものであることが好ましい。   (2) The protective feeling described above is a U-shape formed so that a cross section is formed in a U-shape by one of the outer peripheral curved surface and the inner peripheral curved surface and a pair of lateral curved surfaces. A member having the other of the outer curved surface and the inner curved surface, and a lid member for closing the open ends of the pair of side curved surfaces in the U-shaped member. Preferably, there is.

（３）前記した防護管において、各側方湾曲面は少なくとも２つの前記切込を有し、各側方湾曲面の開放端は、前記切込の間において、前記湾曲部の曲率に対応した弧状に形成されているよい。そのようにすれば、内周側湾曲面と接触するコ字状部材の開放端が、連続して湾曲部の曲率に対応した滑らかなコ字状となる。これにより、内側が滑らかに湾曲する防護管を容易に形成することができる。   (3) In the above-described protective tube, each side curved surface has at least two cuts, and an open end of each side curved surface corresponds to a curvature of the bent portion between the cuts. It may be formed in an arc shape. With this configuration, the open end of the U-shaped member that comes into contact with the inner-side curved surface continuously has a smooth U-shape corresponding to the curvature of the curved portion. This makes it possible to easily form a protective tube whose inside is smoothly curved.

（４）前記した防護管において、前記切込は、Ｖ字形状のＶ字切込として設けられ、前記Ｖ字切込は、各側方湾曲面において、前記外周側湾曲面との境界が前記Ｖ字形状の頂点となるように前記頂面部側から切り込まれ、前記Ｖ字形状の両辺が近接するように、前記両側方湾曲面の間で対向する前記Ｖ字切込の前記頂点を相互に結ぶ仮想線を軸として前記外周側湾曲面が湾曲されて、近接した前記Ｖ字切込の両側辺を溶接することにより前記湾曲部が形成されていてもよい。   (4) In the protective tube described above, the cut is provided as a V-shaped cut having a V-shape, and the V-cut is formed such that a boundary between the outer curved surface and the outer curved surface is formed on each side curved surface. The V-shaped notch is cut from the top surface side so as to form a vertex of the V-shape, and the vertices of the V-shaped cut facing each other between the curved surfaces on both sides such that both sides of the V-shape are close to each other. The curved portion may be formed by bending the outer peripheral side curved surface around an imaginary line connecting the V-shaped notch and welding both sides of the adjacent V-shaped cut.

そのような防護管によれば、Ｖ字切込を側方湾曲面に設け、当該Ｖ字切込のＶ字形状の両辺が近接するように、外周側湾曲面を湾曲させる場合に、側方湾曲面が重なりあうことなく、変形することができ、切込を溶接する箇所は、近接した両辺の１カ所だけでよくなる。これにより、溶接が容易になり、防護管の製造が容易になる。   According to such a protective tube, when the V-shaped notch is provided on the side curved surface and the outer curved surface is curved so that both sides of the V-shaped of the V-shaped notch are close to each other, The curved surfaces can be deformed without overlapping, and the cuts need to be welded at only one place on both adjacent sides. This facilitates welding and facilitates production of the protective tube.

（５）前記した防護管において、前記両側方湾曲面の間で対向する前記Ｖ字切込は同一形状となるように設けられていてもよい。そのようにすれば、コ字状部材が延在方向に対して対称な形状となり、コ字状部材の設計が容易になる。   (5) In the protective tube described above, the V-shaped cuts facing each other between the curved surfaces on both sides may be provided to have the same shape. By doing so, the U-shaped member has a symmetrical shape with respect to the extending direction, and the U-shaped member can be easily designed.

（６）前記した防護管において、前記内周側湾曲面が板状に形成されることにより、ロ字形状の断面を有していてもよい。そのようにすれば、コ字状部材の開放側を蓋するように配置される内周側湾曲面は、一形状の断面、すなわち板状となり、内周側湾曲面の製造が容易になる。   (6) In the above-mentioned protective tube, the inner peripheral side curved surface may be formed in a plate shape to have a square cross section. By doing so, the inner peripheral side curved surface arranged to cover the open side of the U-shaped member has a cross section of one shape, that is, a plate shape, and the production of the inner peripheral side curved surface becomes easy.

（７）前記した防護管は、金属材料で形成され、鉄道軌道の側方に内周側湾曲面を向けて配置されていてもよい。そのようにすれば、鉄号軌道の周囲に敷かれた敷石が飛散しても、金属製の防護管が内部に挿通された電線等の内部物質を確実に保護する   (7) The above-mentioned protective tube may be formed of a metal material, and may be arranged with the inner peripheral side curved surface facing the side of the railway track. In this way, even if the cobblestones laid around the railroad track scatter, the metal protective tube will surely protect the internal substances such as electric wires inserted inside.

（８）本発明に係る防護管の製造方法は、中空の筒状に形成され、中空部に挿通された他部材を防護する防護管の製造方法であって、前記防護管が、所定の曲率半径で湾曲した湾曲部を有し、前記湾曲部が、前記曲率半径方向の外周側をなす外周側湾曲面と、前記曲率半径方向の内周側をなす内周側湾曲面と、前記外周側湾曲部及び内周側湾曲部の中間部をなし、対向するように配置された一対の側方湾曲面とを有するものであり、前記外周側湾曲面及び前記内周側湾曲面のいずれか一方と、一対の側方湾曲面とにより、断面がコ字形状となるように形成されたコ字状部材を準備するコ字状部材準備工程と、前記外周側湾曲面及び前記内周側湾曲面の他方を備えた蓋部材を、前記コ字状部材において前記一対の側方湾曲面の開放端側を閉塞するように結合させる結合工程とを含むことを特徴とする。   (8) A method for manufacturing a protective tube according to the present invention is a method for manufacturing a protective tube which is formed in a hollow cylindrical shape and protects other members inserted into the hollow portion, wherein the protective tube has a predetermined curvature. An outer peripheral side curved surface forming an outer peripheral side in the radius of curvature direction, an inner peripheral side curved surface forming an inner peripheral side in the radius of curvature direction, and the outer peripheral side It forms an intermediate portion between the curved portion and the inner peripheral side curved portion, and has a pair of side curved surfaces arranged so as to face each other, and one of the outer peripheral side curved surface and the inner peripheral side curved surface is provided. And a pair of side curved surfaces, a U-shaped member preparing step of preparing a U-shaped member formed to have a U-shaped cross section, the outer peripheral curved surface and the inner peripheral curved surface Cover the open end side of the pair of side curved surfaces in the U-shaped member. Characterized in that it comprises a binding step of binding to.

この防護管の製造方法によれば、切込を側方湾曲面に設け、外周側湾曲面付近まで及ぶ、その切込の終点を軸に外周側湾曲面を湾曲させることにより、外周側湾曲面と両側方湾曲面とからなるコ字状部材が湾曲し、コ字状部材の曲率に対応して頂面部を湾曲させてコ字状部に結合することにより、容易に湾曲部を有する防護管を製造することができる。そのようにすれば、湾曲部を有する防護管を安価でかつ寸法精度良く製造することができる。   According to this method of manufacturing a protective tube, the cut is provided on the side curved surface, and extends to the vicinity of the outer curved surface, and the outer curved surface is curved around the end point of the cut as an axis, whereby the outer curved surface is formed. A U-shaped member having a curved surface and a curved surface on both sides is curved, and the top surface portion is curved in accordance with the curvature of the U-shaped member to be joined to the U-shaped portion, thereby easily providing a protective tube having a curved portion. Can be manufactured. By doing so, a protective tube having a curved portion can be manufactured at low cost and with high dimensional accuracy.

（９）前記コ字状部材準備工程は、概略板状の板状部材の両側から略同一形状で対向する切込を設ける切断ステップと、断面がコ字形状となるように、前記板状部材の両側を前記切込の前記終点で折り曲げる折曲ステップと、前記両側方湾曲面の間で対向する前記切込の前記終点を相互に結ぶ仮想線を軸として前記外周側湾曲面を湾曲させる湾曲ステップとを含んでいてもよい。   (9) The step of preparing the U-shaped member includes a step of providing cuts that are substantially identical in shape and opposing from both sides of the substantially plate-shaped plate member, and the step of forming the U-shaped member so that the cross section becomes U-shaped. A bending step of bending both sides of the notch at the end point of the cut, and bending the outer peripheral side curved surface around an imaginary line connecting the end points of the cuts facing each other between the two side curved surfaces. Steps may be included.

この防護管の製造方法によれば、コ字状部材を、切断ステップと、折曲ステップと、湾曲ステップの３つのステップに分解して形成する。これらの切断ステップ、折曲ステップおよび湾曲ステップは、プレス加工で所望の金属部品を形成するステップに比較して簡易な製造ステップであり、コ字形状部材に容易に湾曲部を形成することができる。   According to this method for manufacturing a protective tube, the U-shaped member is formed by being disassembled into three steps of a cutting step, a bending step, and a bending step. These cutting step, bending step, and bending step are simpler manufacturing steps compared to the step of forming a desired metal part by press working, and can easily form a curved portion on the U-shaped member. .

（１０）前記切断ステップは、前記コ字状部材の各側方湾曲面に、前記切込として少なくとも２つの前記Ｖ字切込を設けることと、各側方湾曲面の前記開放端を。前記Ｖ字切込の間において、前記湾曲部の曲率に対応した弧状に切断することとを含んでいてもよい。   (10) In the cutting step, at least two V-shaped cuts are provided as the cuts on each side curved surface of the U-shaped member, and the open end of each side curved surface. Cutting between the V-shaped cuts in an arc shape corresponding to the curvature of the curved portion may be included.

そのような防護管の製造方法によれば、Ｖ字切込を側方湾曲面に設け、当該Ｖ字切込のＶ字形状の両辺が近接するように、外周側湾曲面を湾曲させる場合に、側方湾曲面が重なりあうことなく、変形することができ、切込を溶接する箇所は、近接した両辺の１カ所だけでよくなる。これにより、溶接が容易になり、防護管の製造が容易になる。   According to such a method of manufacturing a protective tube, a V-shaped notch is provided on a side curved surface, and when the outer curved surface is curved so that both sides of the V-shaped of the V-shaped notch are close to each other. The side curved surfaces can be deformed without overlapping each other, and the cuts need to be welded at only one place on both adjacent sides. This facilitates welding and facilitates production of the protective tube.

（１１）本発明に係る防護管の部品は、中空の筒状に形成され、中空部に挿通された他部材を防護するものであって、所定の曲率半径で湾曲した湾曲部を有し、前記湾曲部が、前記曲率半径方向の外周側をなす外周側湾曲面と、前記曲率半径方向の内周側をなす内周側湾曲面と、前記外周側湾曲部及び内周側湾曲部の中間部をなし、対向するように配置された一対の側方湾曲面とを有するものであって、各側方湾曲面は、少なくとも１つの切込が前記両側方湾曲面の間で対向する位置に設けられ、前記切込は、各側方湾曲面において、前記外周側湾曲面と前記両側方湾曲面の境界が終点となるように、前記コ字状部材の開放端から切り込まれ、対向する前記切込の頂点を結ぶ仮想線を軸として前記外周側湾曲面が湾曲されることにより前記湾曲部が形成されていることを特徴とする。   (11) The protective tube component according to the present invention is formed in a hollow cylindrical shape and protects another member inserted into the hollow portion, and has a curved portion curved with a predetermined radius of curvature, An outer peripheral curved surface forming an outer peripheral side in the radius of curvature direction, an inner peripheral side curved surface forming an inner peripheral side in the radius of curvature direction, and an intermediate portion between the outer peripheral curved portion and the inner peripheral curved portion; And a pair of side curved surfaces arranged so as to face each other, wherein each side curved surface is at a position where at least one cut is opposed between the two side curved surfaces. Provided, the cut is cut from the open end of the U-shaped member so as to face the boundary between the outer peripheral side curved surface and the both side curved surface in each side curved surface, and oppose each other. The outer curved surface is curved around an imaginary line connecting the vertices of the cut, so that the bay is curved. Wherein the part is formed.

この防護管の部品では、切込を側方湾曲面に設け、外周側湾曲面付近まで及ぶ、その切込の終点を軸に外周側湾曲面を湾曲させることにより、中空の筒状の防護管において、外周側湾曲面と両側方湾曲面とからなるコ字状部材を容易に湾曲させ、湾曲部を有するコ字状部材を製造することができる。そのようにすれば、プレス加工用の金型等を利用することなく、湾曲部を有するコ字状部材を、安価な製造コストでかつ高い形状の自由度を確保して提供することができる。   In this protective tube part, a hollow cylindrical protective tube is formed by forming a cut in the side curved surface and bending the outer curved surface around the end point of the cut to reach the vicinity of the outer curved surface. In this case, the U-shaped member having the outer curved surface and the two-sided curved surface can be easily curved to produce a U-shaped member having a curved portion. By doing so, a U-shaped member having a curved portion can be provided at a low manufacturing cost and with a high degree of freedom of shape without using a press working die or the like.

（１２）前記した防護管の部品において、前記切込は、Ｖ字形状のＶ字切込が前記両側方湾曲面の間で対向するように設けられ、前記Ｖ字切込は、各側方湾曲面において、前記外周側湾曲面との境界が前記Ｖ字形状の頂点となるように前記開放端から切り込まれ、前記Ｖ字形状の両辺が近接するように前記外周側湾曲面が湾曲されて、近接した前記Ｖ字切込の両側辺を溶接することにより前記湾曲部が形成されている。   (12) In the above-mentioned parts of the protective tube, the cut is provided such that a V-shaped cut of a V-shape faces between the curved surfaces on both sides, and the V-cut is formed on each side. In the curved surface, a boundary with the outer peripheral side curved surface is cut from the open end so as to be a vertex of the V-shape, and the outer peripheral side curved surface is curved so that both sides of the V-shaped shape are close to each other. Then, the curved portion is formed by welding both sides of the adjacent V-shaped cut.

そのようなコ字状部材によれば、Ｖ字切込を側方湾曲面に設け、当該Ｖ字切込のＶ字形状の両辺が近接するように、外周側湾曲面を湾曲させる場合に、側方湾曲面が重なりあうことなく、変形することができ、切込を溶接する箇所は、近接した両辺の１カ所だけでよくなる。これにより、溶接が容易になり、コ字状部材の製造が容易になる。   According to such a U-shaped member, when the V-shaped cut is provided on the side curved surface, and the outer curved surface is curved so that both sides of the V-shaped cut of the V-shaped cut are close to each other, The side curved surfaces can be deformed without overlapping, and the cuts need to be welded at only one place on both adjacent sides. Thereby, welding becomes easy and manufacture of a U-shaped member becomes easy.

本発明は、製造容易かつ形状の自由度が高い防護管を提供することができる。   The present invention can provide a protective tube that is easy to manufacture and has a high degree of freedom in shape.

本発明の第１の実施形態に係る防護管を鉄道軌道の付近に配設した状態を示す概念図である。It is a conceptual diagram showing the state where the protection pipe concerning a 1st embodiment of the present invention was arranged near the railroad track. 本発明の第１の実施形態に係る防護管を示す概略斜視図である。It is a schematic perspective view showing a protection pipe concerning a 1st embodiment of the present invention. 本発明の第１の実施形態に係る防護管のコ字状部を形成する板状部材を示す平面図である。It is a top view showing the plate-shaped member which forms the U-shaped part of the protection pipe concerning a 1st embodiment of the present invention. 本発明の第１の実施形態に係る防護管を示す図であり、（Ａ）は、コ字状部材を湾曲させる前の概略側面図であり、（Ｂ）は、コ字状部材を湾曲させた後の側面概略図である。It is a figure which shows the protective tube which concerns on 1st Embodiment of this invention, (A) is a schematic side view before bending a U-shaped member, (B) is bending a U-shaped member. FIG. 本発明の第１の実施形態に係る防護管の製造方法を示す概念工程図である。It is a conceptual process drawing which shows the manufacturing method of the protection pipe which concerns on 1st Embodiment of this invention. 本発明の変形例に係る防護管を示す拡大側面図である。It is an expanded side view which shows the protective tube which concerns on the modification of this invention.

［防護管の実施形態］ [Embodiment of protective tube]

本発明の実施形態に係る防護管１に図１〜４を参照して説明する。   A protection pipe 1 according to an embodiment of the present invention will be described with reference to FIGS.

防護管１は、図１に示すように、鉄道軌道Ｌの周囲に設けられ、電車向けの高圧ケーブルのような電線の保護に用いられる。防護管１は、中空の筒状に形成され、中空部に挿通されたケーブルを防護する。防護管１は、例えば、鉄道軌道Ｌの付近に敷き詰められた敷石Ｋが電車の通過により飛散する場合等に高圧ケーブルを防護する。   The protection pipe 1 is provided around the railway track L as shown in FIG. 1 and is used for protecting electric wires such as high-voltage cables for electric trains. The protection tube 1 is formed in a hollow cylindrical shape, and protects a cable inserted in the hollow portion. The protection pipe 1 protects a high-voltage cable, for example, when the paving stones K spread near the railway track L are scattered by passing a train.

防護管１は、図２に示すように、ロ字形状の断面で中空の筒状なるように形成され、直線管１０と、湾曲管２０とを備える。直線管１０と、湾曲管２０とは、連結部材３０を介して結合されている。連結部材３０は、従来よく知られる補強金物やボルトにより構成されている。   As shown in FIG. 2, the protection pipe 1 is formed in a hollow cylindrical shape with a rectangular cross section, and includes a straight pipe 10 and a curved pipe 20. The straight tube 10 and the curved tube 20 are connected via a connecting member 30. The connecting member 30 is formed of a conventionally well-known reinforcing metal or bolt.

直線管１０は、頂面１１、底面（図示なし）および両側面１３から断面がロ字形状となるように形成され、ロ字形状を維持したまま直線状に延在している。直線管１０は、断面矩形の金属管から構成され、頂面１１が線路の軌道側に向くように配設される。   The straight tube 10 is formed so as to have a rectangular cross section from the top surface 11, the bottom surface (not shown), and both side surfaces 13, and extends linearly while maintaining the rectangular shape. The straight tube 10 is formed of a metal tube having a rectangular cross section, and is arranged such that the top surface 11 faces the track side of the line.

湾曲管２０は、直線管１０と同様に、頂面２１、底面２２および両側面２３から断面がロ字形状となるように形成され、ロ字形状を維持したまま湾曲しながら延在する。これにより、湾曲管２０は、防護管１の湾曲部を形成する。また、湾曲管２０は、底面２２、両側面２３を形成する断面がコ字形状のコ字状部材２４（図５（Ｃ）を参照）と、頂面２１を形成する内周側湾曲面２５（図５（Ｅ）を参照）とから構成されている。   Similar to the straight tube 10, the curved tube 20 is formed so that the cross section is formed in a rectangular shape from the top surface 21, the bottom surface 22, and both side surfaces 23, and extends while bending while maintaining the rectangular shape. Thereby, the bending tube 20 forms a bending portion of the protection tube 1. The curved tube 20 has a U-shaped member 24 (see FIG. 5C) having a U-shaped cross section that forms a bottom surface 22 and both side surfaces 23, and an inner peripheral side curved surface 25 that forms a top surface 21. (See FIG. 5E).

コ字状部材２４は、コ字形状を維持したまま底面２２と交差する方向に湾曲しながら延在する。内周側湾曲面２５は、板状に形成されており、湾曲するコ字状部材２４と略同一の曲率で湾曲している。湾曲管２０は、コ字状部材２４の開放側である両側面２３の開放端２３ｕ（図３を参照）に内周側湾曲面２５を載置し、結合部材２６により結合している。結合部２６は、コ字状部材２４と内周側湾曲面２５とのそれぞれに溶接して結合された結合金物２６ａをボルト２６ｂで固定して形成される。   The U-shaped member 24 extends while bending in a direction intersecting with the bottom surface 22 while maintaining the U-shape. The inner peripheral side curved surface 25 is formed in a plate shape, and is curved with substantially the same curvature as the curved U-shaped member 24. The curved tube 20 has an inner peripheral curved surface 25 placed on open ends 23u (see FIG. 3) of both side surfaces 23 on the open side of the U-shaped member 24, and is coupled by a coupling member 26. The coupling portion 26 is formed by fixing a coupling hardware 26a, which is welded and coupled to each of the U-shaped member 24 and the inner curved surface 25, with a bolt 26b.

コ字状部材２４は、図３に示すように、概略矩形の板状部材２４ｏから形成される。板状部材２４ｏは、両側端から幅方向に同一の寸法で折り曲げ可能に構成されている。なお、図３において、板状部材２４ｏを折り曲げる折り曲げ線を二点鎖線で示し、この二点鎖線が底面２２部と両側面２３部との境界ｉとなる。また、板状部材２４ｏの両側単は、コ字状部材２４の開放端２３ｕとなる。   The U-shaped member 24 is formed from a substantially rectangular plate-shaped member 24o as shown in FIG. The plate-like member 24o is configured to be able to bend in the same direction in the width direction from both side ends. In FIG. 3, a fold line for bending the plate-like member 24 o is indicated by a two-dot chain line, and the two-dot chain line is a boundary i between the bottom surface 22 and the both side surfaces 23. Further, the both sides of the plate-like member 24o are open ends 23u of the U-shaped member 24.

コ字状部材２４は、複数の切込２７が設けられており、板状部材２４ｏの両端から中央に向けて切り込まれた切込２７の終点は、底面２２部と両側面２３部との境界ｉ上に位置する。本実施形態において、切込２７は、Ｖ字形状のＶ字切込２７ｖとして形成されている。Ｖ字切込２７ｖは、コ字状部材２４の底面２２部と両側面２３部の境界（図３における二点鎖線）を頂点２７ｏとして、コ字状部材２４の開放端２３ｕとなる板状部材２４ｏの幅方向の両端から切り込まれる。   The U-shaped member 24 is provided with a plurality of cuts 27, and the end point of the cut 27 cut from both ends of the plate-shaped member 24o toward the center is defined by the bottom surface 22 and the both side surfaces 23. It is located on the boundary i. In the present embodiment, the cut 27 is formed as a V-shaped cut 27v. The V-shaped notch 27v is a plate-like member that becomes the open end 23u of the U-shaped member 24 with the vertex 27o at the boundary (the two-dot chain line in FIG. 3) between the bottom surface 22 and the side surfaces 23 of the U-shaped member 24. It is cut from both ends in the width direction of 24o.

Ｖ字切込２７ｖは、コ字状部材２４の両側面２３の間で対向する位置に形成されており、対向するＶ字切込２７ｖは、同一形状となるように切り込まれている。各側面２３は、７つのＶ字切込２７ｖが形成されている。なお、図３において、長手方向の両端のＶ字切込２７ｖは、Ｖ字形状の角度が７．５°に、それ以外のＶ字切込２７ｖは、Ｖ字形状の角度が１５°に切り込まれている。   The V-shaped cuts 27v are formed at positions facing each other between the two side surfaces 23 of the U-shaped member 24, and the opposed V-shaped cuts 27v are cut so as to have the same shape. Each side surface 23 is formed with seven V-shaped cuts 27v. In FIG. 3, the V-shaped cuts 27v at both ends in the longitudinal direction have a V-shaped angle of 7.5 °, and the other V-shaped cuts 27v have a V-shaped angle of 15 °. Is embedded.

次に、コ字状部材２４を外周側湾曲面２２で湾曲させる工程について説明する。図４は、コ字状部材２４の外周側湾曲面２２を湾曲させる前後の状態を示し、（Ａ）は、板状部材２４ｏを境界ｉで折り曲げてコ字形状にした状態で湾曲させる前の側面概略図であり、（Ｂ）は、外周側湾曲面を湾曲させた後の側面概略図である。   Next, a process of bending the U-shaped member 24 on the outer peripheral side curved surface 22 will be described. 4A and 4B show a state before and after the outer peripheral curved surface 22 of the U-shaped member 24 is curved, and FIG. 4A shows a state before the plate-shaped member 24o is bent at the boundary i to be curved in a U-shape. It is a side surface schematic diagram, (B) is a side surface schematic diagram after curving an outer peripheral side curved surface.

コ字状部材２４は、板状部材２４ｏの両側を境界ｉで折り曲げた後、両側方湾曲面２３の間で対向するＶ字切込２７ｖの頂点２７ｏを相互に結ぶ仮想線ｊを軸として（図３を参照）、外周側湾曲面２２を湾曲させることができる（図４（Ａ）を参照）。   The U-shaped member 24 is formed by bending both sides of the plate-shaped member 24o at the boundary i and then using an imaginary line j connecting the apexes 27o of the V-shaped cuts 27v facing each other between the two curved surfaces 23 as an axis ( The outer peripheral side curved surface 22 can be curved (see FIG. 4A).

外周側湾曲面２２を湾曲させた後、Ｖ字切込２７ｖのＶ字形状の近接した両辺２７ｉを溶接して溶接部２７ｃとすることによりコ字状部材２４は湾曲した状態で固定される。（図４（Ｂ）を参照）。すなわち、コ字状部材２４は、Ｖ字切込２７ｖのＶ字形状の両辺２７ｉが近接するように底面２２部を湾曲して形成される。   After the outer peripheral side curved surface 22 is curved, the two sides 27i of the V-shaped notch 27v that are close to each other in the V-shape are welded to form a welded portion 27c, so that the U-shaped member 24 is fixed in a curved state. (See FIG. 4B). That is, the U-shaped member 24 is formed by curving the bottom surface 22 so that the V-shaped sides 27i of the V-shaped cut 27v are close to each other.

防護管１によれば、Ｖ字切込２７ｖを側方湾曲面２３に設け、Ｖ字切込２７ｖのＶ字形状の両辺２７ｉが近接するように、外周側湾曲面２２を湾曲させる場合に、側方湾曲面２２が重なりあうことなく、外周側湾曲面２２を湾曲させることができ、溶接部２７ｃは、近接した両辺の１カ所だけでよくなる。これにより、溶接が容易になり、防護管１の製造が容易になる。   According to the protection tube 1, when the V-shaped notch 27 v is provided in the side curved surface 23, and when the outer curved surface 22 is curved so that both sides 27 i of the V-shaped notch 27 v are close to each other, The outer curved surface 22 can be curved without the side curved surfaces 22 overlapping each other, and the welded portion 27c only needs to be provided at one location on both adjacent sides. Thereby, welding becomes easy and manufacture of the protection pipe 1 becomes easy.

板状部材２４ｏは、Ｖ字切込２７ｖの間において、コ字状部材２４の開放端２３ｕとなる幅方向の両端が、湾曲部の曲率に適合して弧状に形成されている。これにより、板状部材２４ｏからコ字状部材２４を形成した際に、コ字状部材２４の開放端２３ｕは、湾曲部の曲率と略同一の曲率で連続して滑らかなコ字状に形成される（図４（Ｂ）を参照）。   The plate-like member 24o is formed in an arc shape between the V-shaped cuts 27v, in which both ends in the width direction to be the open ends 23u of the U-shaped member 24 conform to the curvature of the curved portion. Thereby, when the U-shaped member 24 is formed from the plate-shaped member 24o, the open end 23u of the U-shaped member 24 is continuously formed into a smooth U-shape with substantially the same curvature as the curvature of the curved portion. (See FIG. 4B).

湾曲管２０は、対面部と略同一幅で形成された板状の内周側湾曲面２５を湾曲させて、コ字状部材２４の開放側に蓋をするように、湾曲したコ字状部材２４の開放端２３ｕに載置して、コ字状部材２４の開放端２３ｕと内周側湾曲面２５との接触する部分を結合部材２６により結合している。   The curved tube 20 is formed by bending a plate-shaped inner peripheral curved surface 25 having substantially the same width as the facing portion so as to cover the open side of the U-shaped member 24. 24, the portion where the open end 23u of the U-shaped member 24 and the inner peripheral side curved surface 25 are in contact with each other is joined by a joining member 26.

［防護管の製造方法］   [Production method of protective tube]

次に、本実施形態に係る防護管１の湾曲管２０の製造方法について図５を参照して説明する。図５は、湾曲管２０を製作する順序を示すための概念工程図である。   Next, a method of manufacturing the curved tube 20 of the protection tube 1 according to the present embodiment will be described with reference to FIG. FIG. 5 is a conceptual process chart for showing an order of manufacturing the bending tube 20.

防護管１の製造方法は、湾曲管２０の部品であるコ字状部材２４を形成するコ字状部材準備工程（Ｓ１〜Ｓ４）と、コ字状部材２４と内周側湾曲面２５とを結合する内周側湾曲面結合工程（Ｔ１〜Ｔ３）とを含む。図５（Ａ）〜図５（Ｄ）は、コ字状部材準備工程を示し、図５（Ｅ）〜図５（Ｇ）は内周側湾曲面結合工程を示す。   The method for manufacturing the protective tube 1 includes a step of preparing a U-shaped member (S1 to S4) for forming a U-shaped member 24 which is a component of the curved tube 20, and a step of forming the U-shaped member 24 and the inner peripheral side curved surface 25. (T1 to T3). 5 (A) to 5 (D) show a U-shaped member preparing step, and FIGS. 5 (E) to 5 (G) show an inner peripheral side curved surface joining step.

コ字状部材準備工程は、概略矩形の板状部材２４ｏを準備する板状部材準備ステップ（Ｓ−１）と、板状部材２４ｏの両側から略同一形状で対向する切込２７を設ける切断ステップ（Ｓ−２）と、断面がコ字形状となるように、前記板状部材２４ｏの両側を折り曲げる折曲ステップ（Ｓ−３）と、底面２２部を湾曲させる湾曲ステップ（Ｓ−４）とを含む。   The U-shaped member preparing step includes a plate-shaped member preparing step (S-1) for preparing a substantially rectangular plate-shaped member 24o, and a cutting step for providing cuts 27 facing each other in substantially the same shape from both sides of the plate-shaped member 24o. (S-2), a bending step (S-3) of bending both sides of the plate-shaped member 24o so that the cross section becomes a U-shape, and a bending step (S-4) of bending the bottom surface 22 portion. including.

板状部材準備ステップ（図５（Ａ）を参照）では、概略矩形の板状部材２４ｏが準備される（Ｓ−１）。板状部材２４ｏは、鉄を主な材料として表裏の両面に亜鉛メッキを施されている。板状部材２４ｏの長さ寸法、幅寸法、厚さ寸法は、防護管１の用途や配設箇所に応じて適宜選択される。   In the plate member preparing step (see FIG. 5A), a substantially rectangular plate member 24o is prepared (S-1). The plate-like member 24o is made of zinc as a main material and is plated with zinc on both front and back surfaces. The length dimension, width dimension, and thickness dimension of the plate-like member 24o are appropriately selected according to the use of the protective tube 1 and the location of the protection tube 1.

切断ステップ（図５（Ｂ）を参照）では、板状部材２４ｏを切断することによりＶ字切込２７ｖが形成される（Ｓ−２）。また、切断ステップでは、Ｖ字切込２７ｖの他にも、コ字状の開放端２３ｕとなる板状部材２４ｏの両側が、Ｖ字切込２７ｖの間において弧状になるように、板状部材２４ｏが切断される（図３を参照）。このように、切断ステップでは、板状部材２４ｏを切断し、所望の形状とすることができる。   In the cutting step (see FIG. 5B), a V-shaped cut 27v is formed by cutting the plate member 24o (S-2). In addition, in the cutting step, in addition to the V-shaped cut 27v, the plate-shaped member 24o serving as the U-shaped open end 23u is formed so that both sides of the plate-shaped member 24o are arc-shaped between the V-shaped cuts 27v. 24o is cut (see FIG. 3). Thus, in the cutting step, the plate-like member 24o can be cut into a desired shape.

折曲ステップ（図５（Ｃ）を参照）では、板状部材２４ｏの両側が、Ｖ字切込２７ｖの頂点２７ｏを境界ｉにて折り曲げることで、底面２２部と両側面２３部とからなるコ字状部材２４が形成される（Ｓ−２）。切断ステップおよび折り曲げステップは従来よく知られる板金加工により行われる。   In the bending step (see FIG. 5C), both sides of the plate-like member 24o are formed of a bottom surface 22 and two side surfaces 23 by bending the vertex 27o of the V-shaped cut 27v at the boundary i. The U-shaped member 24 is formed (S-2). The cutting step and the bending step are performed by a well-known sheet metal working.

湾曲ステップ（図５（Ｄ）を参照）では、Ｖ字切込２７ｖのＶ字形状の両辺が近接するように底面２２部を湾曲させる（Ｓ−４）。このとき、底面２２部は、両側面２３部において対向するＶ字切込２７ｖのＶ字形状の頂点２７ｏ、すなわち切込２７の終点を幅方向に結ぶ仮想線ｊ（図３を参照）を軸に湾曲される。   In the bending step (see FIG. 5D), the bottom surface 22 is bent so that both sides of the V-shaped cut 27v are close to each other (S-4). At this time, the bottom surface 22 has a V-shaped vertex 27o of the V-shaped cut 27v facing the both sides 23, that is, an imaginary line j (see FIG. 3) connecting the end point of the cut 27 in the width direction. Curved.

底面２２部が湾曲される角度は、各側面２３部のＶ字切込２７ｖの角度となる。湾曲されたコ字状部材２４は、近接するＶ字形状の両辺２７ｉ（図４（Ｂ）を参照）を溶接して溶接部２７ｃを形成し、固定される。また、コ字状部材の開放端２３ｕは、弧状に形成されており、コ字状部材２４が湾曲された状態で、連続して円弧状に形成されている。   The angle at which the bottom surface 22 is bent is the angle of the V-shaped cut 27v of each side surface 23 portion. The curved U-shaped member 24 is fixed by welding the adjacent V-shaped sides 27i (see FIG. 4B) to form a welded portion 27c. The open end 23u of the U-shaped member is formed in an arc shape, and is continuously formed in an arc shape with the U-shaped member 24 being curved.

以上のステップにより、コ字状部材準備工程では、底面２２部とその底面２２部の両片に接続する両側面２３部とから断面がコ字形状となるようにコ字状部材２４が形成され、コ字状部材２４は、コ字形状を維持しながら延在し、延在する途中に前記底面２２部に交差する方向に湾曲する湾曲部を有するように形成される。   Through the steps described above, in the U-shaped member preparing step, the U-shaped member 24 is formed from the bottom surface 22 and the both side surfaces 23 connected to both pieces of the bottom surface 22 so as to have a U-shaped cross section. The U-shaped member 24 is formed so as to extend while maintaining the U-shape, and to have a curved portion that is curved in a direction intersecting the bottom surface 22 during the extension.

本実施形態に係る湾曲部２０の製造方法において、コ字状部材２４の各側面２３部は、少なくとも１つの切込２７が両側面２３部の間で対向する位置に設けられている。切込２７は、各側面２３部において、底面２２部と側面２３部との境界ｉが切込２７の終点となるように、コ字状部材２４の開放端２３ｕから切り込まれている。また、底面２２部は、対向する切込２７の頂点２７ｏを結ぶ仮想線ｊを軸として湾曲されており、切込２７の各辺を溶接することにより湾曲部とされている。   In the method of manufacturing the curved portion 20 according to the present embodiment, each side surface 23 of the U-shaped member 24 is provided at a position where at least one cut 27 is opposed between the both side surfaces 23. The notch 27 is cut from the open end 23u of the U-shaped member 24 such that the boundary i between the bottom surface 22 and the side surface 23 is the end point of the notch 27 at each side surface 23. The bottom surface 22 is curved about an imaginary line j connecting the vertices 27o of the cuts 27 facing each other, and is formed into a curved portion by welding each side of the cut 27.

本実施形態において、コ字状部材２４は、金属材料から形成され、幅方向に同一の寸法で折り曲げ可能な一方の側面２３および他方の側面２３を備える概略矩形の板状部材２４ｏを準備する。板状部材２４ｏは、一方および他方の側面２３の長手方向に所定の間隔で外側から内側にＶ字状に切り込まれた複数のＶ字切込２７ｖを有し、一方および他方の側面２３における前記Ｖ字切込２７ｖは、相互に頂点２７ｏを向けて同一形状で対向している（図３を参照）。   In the present embodiment, the U-shaped member 24 is prepared from a metal material and prepares a substantially rectangular plate-shaped member 24o having one side surface 23 and the other side surface 23 that can be bent in the same direction in the width direction. The plate-like member 24o has a plurality of V-shaped cuts 27v cut in a V-shape from the outside to the inside at predetermined intervals in the longitudinal direction of the one and the other side surfaces 23. The V-shaped cuts 27v face each other with the same shape with the vertex 27o facing each other (see FIG. 3).

ここで、Ｖ字切込２７ｖを側方湾曲面２３に設け、Ｖ字切込２７ｖのＶ字形状の両辺２７ｉが近接するように、外周側湾曲面２２を湾曲させる場合に、側方湾曲面２２が重なりあうことなく、外周側湾曲面２２を湾曲させることができ、溶接部２７ｃは、近接した両辺の１カ所だけでよくなる。これにより、溶接が容易になり、コ字状部材の製造が容易になる。   Here, the V-shaped notch 27v is provided in the side curved surface 23, and when the outer peripheral side curved surface 22 is curved so that both sides 27i of the V-shaped of the V-shaped notch 27v are close to each other, the side curved surface The outer peripheral curved surface 22 can be curved without overlapping the welded portions 22, and the welded portion 27 c can be formed only at one place on both adjacent sides. Thereby, welding becomes easy and manufacture of a U-shaped member becomes easy.

内周側湾曲面結合工程は、コ字状部材２４の開放側に蓋をするための内周側湾曲面２５を準備する内周側湾曲面準備ステップ（Ｔ−１）と、内周側湾曲面２５を湾曲させる内周側湾曲面湾曲ステップ（Ｔ−２）と、湾曲した内周側湾曲面２５をコ字状部材２４に配置して結合する結合ステップ（Ｔ−３）とを含む。
を含む。 The inner curved surface coupling step includes an inner curved surface preparing step (T-1) of preparing an inner curved surface 25 for covering the open side of the U-shaped member 24 and an inner curved surface. An inner peripheral side curved surface bending step (T-2) for curving the surface 25 and a coupling step (T-3) for arranging and coupling the curved inner peripheral side curved surface 25 to the U-shaped member 24 are included.
including.

内周側湾曲面準備ステップ（図５（Ｅ）を参照）では、板状の内周側湾曲面２５が準備される（Ｔ−１）。内周側湾曲面２５は、コ字状部材２４と同様に、表裏の両面を亜鉛メッキにより処理されている。内周側湾曲面２５の長さ寸法、幅寸法、厚さ寸法は、コ字状部材２４の蓋をして、敷石の飛散等から電線を保護できるようにコ字状部材２４に対応して選択される。   In the inner peripheral side curved surface preparation step (see FIG. 5E), a plate-shaped inner peripheral side curved surface 25 is prepared (T-1). Like the U-shaped member 24, the inner peripheral side curved surface 25 has both front and back surfaces treated by zinc plating. The length, width, and thickness dimensions of the inner peripheral side curved surface 25 correspond to the U-shaped member 24 so as to cover the U-shaped member 24 and protect the electric wires from scattering of the paving stones. Selected.

内周側湾曲面湾曲ステップ（図５（Ｆ）を参照）では、板状の内周側湾曲面２５が、湾曲したコ字状材に対応した曲率に湾曲される（Ｔ−２）。内周側湾曲面２５も従来よく知られる板金加工により湾曲される。   In the step of bending the inner peripheral side curved surface (see FIG. 5 (F)), the plate-shaped inner peripheral side curved surface 25 is curved to a curvature corresponding to the curved U-shaped material (T-2). The inner peripheral side curved surface 25 is also curved by well-known sheet metal processing.

結合ステップ（図５（Ｇ）を参照）では、湾曲された内周側湾曲面２５を、コ字状部材２４の上に載置し、結合部材２６により結合する（Ｔ−３）。具体的には、湾曲した内周側湾曲面２５が、湾曲したコ字状部材２４に載置されて、コ字状部材２４の開放端２３ｕと接触した状態で結合されることにより湾曲管２０が製造される。湾曲管２０は、コ字状部材２４と板状の内周側湾曲面２５により、断面ロ字状に形成されている。なお、図５（Ｇ）では、結合部材２６（図２を参照）については省略する。   In the joining step (see FIG. 5 (G)), the curved inner peripheral side curved surface 25 is placed on the U-shaped member 24 and joined by the joining member 26 (T-3). Specifically, the curved inner peripheral side curved surface 25 is placed on the curved U-shaped member 24 and is coupled in a state of being in contact with the open end 23u of the U-shaped member 24, thereby forming the curved tube 20. Is manufactured. The curved tube 20 is formed in a U-shaped cross section by a U-shaped member 24 and a plate-shaped inner curved surface 25. In FIG. 5G, the connection member 26 (see FIG. 2) is omitted.

［変形例］ [Modification]

本発明の変形例に係る防護管１について図５を参照して説明する。。図４は、変形例に係るコ字状部材２４Ａの外周側湾曲面２２Ａを湾曲させる前後の状態を示し、（Ａ）は、板状部材２４ｏを境界ｉで折り曲げてコ字形状にしたコ字状部材２４Ａを湾曲させる前の概略側面図であり、（Ｂ）は、コ字状部材２４Ａの外周側湾曲面２２Ａを湾曲させた後の概略側面である。   A protection tube 1 according to a modification of the present invention will be described with reference to FIG. . 4A and 4B show a state before and after the outer curved surface 22A of the U-shaped member 24A according to the modified example is bent, and FIG. FIG. 4B is a schematic side view before the curved member 24A is curved, and FIG. 4B is a schematic side view after the outer curved surface 22A of the U-shaped member 24A is curved.

コ字状部材２４Ａは、切込２７の形状においてコ字状部材２４と相違し、その他の部分においてはコ字状部材２４と同様の構成である。すなわち、コ字状部材２４Ａは、切込がＶ字形状ではなく、直線状の切込２７ｌとされている。   The U-shaped member 24A is different from the U-shaped member 24 in the shape of the cut 27, and has the same configuration as the U-shaped member 24 in other portions. That is, the U-shaped member 24A has a straight cut 27l instead of a V-shaped cut.

コ字状部材２４Ａは、板状部材２４ｏの両側を境界ｉで折り曲げた後、両側方湾曲面２３の間で対向する切込２７ｌの終点２７ｏを相互に結ぶ仮想線ｊを軸として（図３を参照）、外周側湾曲面２２を湾曲させることができる（図６（Ａ）を参照）。   The U-shaped member 24A is formed by bending both sides of the plate-shaped member 24o at the boundary i and then using an imaginary line j connecting the end points 27o of the cuts 27l facing each other between the two curved surfaces 23 as an axis (FIG. 3). ), And the outer curved surface 22 can be curved (see FIG. 6A).

外周側湾曲面２２を湾曲させると、直線状の切込２７ｌの一方の辺２７ｉは側面２３の表側に、他方の辺２７ｉは側面２３の裏側にずれて側面２３が概略三角形の重複部を形成する。重複した側面２３の辺２７ｉ付近を溶接して、側面の表裏の両方に溶接部２７ｃが形成される（図６（Ｂ）を参照）。これにより、コ字状部材２４Ａは、湾曲した状態で固定される。   When the outer peripheral side curved surface 22 is curved, one side 27i of the linear cut 27l is shifted to the front side of the side surface 23, and the other side 27i is shifted to the back side of the side surface 23 so that the side surface 23 forms a substantially triangular overlapping portion. I do. A portion near the side 27i of the overlapping side surface 23 is welded to form a welded portion 27c on both the front and back sides of the side surface (see FIG. 6B). As a result, the U-shaped member 24A is fixed in a curved state.

コ字状部２４Ａによれば、直線状の切込２７ｌを側方湾曲面２３に設け、切込２７ｌの両辺２７ｉが側面２３の表側に、他方の辺２７ｉは側面２３の裏側にずれた位置、すなわち２箇所に溶接部２７ｃを設けている。しかし、一方だけを溶接してもよい。   According to the U-shaped portion 24A, a straight cut 27l is provided in the side curved surface 23, and both sides 27i of the cut 27l are shifted to the front side of the side surface 23 and the other side 27i is shifted to the back side of the side surface 23. That is, the welding portion 27c is provided at two places. However, only one may be welded.

板状部材２４ｏは、直線状の切込２７ｌの間において、コ字状部材２４Ａの開放端２３ｕとなる幅方向の両端が、湾曲部の曲率に適合して弧状に形成されている。これにより、板状部材２４ｏからコ字状部材２４Ａを形成した際に、コ字状部材２４の開放端２３ｕは、湾曲部の曲率と略同一の曲率で連続して滑らかなコ字状に形成される（図６（Ｂ）を参照）。   The plate-like member 24o is formed between the straight cuts 27l in such a manner that both ends in the width direction, which are the open ends 23u of the U-shaped member 24A, are formed in an arc shape in conformity with the curvature of the curved portion. Thereby, when the U-shaped member 24A is formed from the plate-shaped member 24o, the open end 23u of the U-shaped member 24 is continuously formed into a smooth U-shape with substantially the same curvature as the curvature of the curved portion. (See FIG. 6B).

本実施形態において、防護管は、鉄道軌道の周囲に配設される形態について説明してきた。この場合は、鉄道軌道の周囲に敷き詰められた敷石が電車の通過により飛散した場合であっても、防護管が金属材料で形成されていることにより、内部の電線を確実に保護することができる。しかし、防護管は、鉄道軌道の周囲に限らず、他の場所に配設されてもよい。さらに、防護管は、石の飛散を受けやすい頂面部を一枚の内周側湾曲面で形成し、溶接部を側方湾曲面に設けている。これにより、防護管は、より確実に電線を保護することができる。   In the present embodiment, the form in which the protection pipe is disposed around the railway track has been described. In this case, even if the paving stones spread around the railroad track are scattered due to the passage of the train, the inner protective wire can be reliably protected by the protective tube made of a metal material. . However, the protection pipe is not limited to the periphery of the railway track, and may be disposed at another place. Further, the protective tube has a top surface portion that is easily scattered by stones formed by a single inner peripheral curved surface, and a welded portion is provided on the lateral curved surface. Thereby, the protective tube can more reliably protect the electric wire.

本実施形態において、防護管は概略ロ字形状の断面を有するように形成されている形態について説明した。しかし、防護管は、湾曲して延在し、内部に電線を挿通できれば他の形状であってもよい。例えば、内周側湾曲面を断面弧状の形成し、防護管の断面がドーム型になるようにしてもよい。   In the present embodiment, the form in which the protective tube is formed so as to have a substantially rectangular cross section has been described. However, the protective tube may be curved and extend, and may have another shape as long as an electric wire can be inserted therein. For example, the inner peripheral side curved surface may be formed in an arc-shaped cross section, so that the cross section of the protection tube has a dome shape.

本実施形態において、防護管の部品としてコ字用部材を用いることで、不安定な施工箇所でも、施工時に安定して防護管を配置することができる。しかし、防護管の部品として、コ字状部材以外の他の断面形状の部品を使用してもよい。   In the present embodiment, by using the U-shaped member as a component of the protection pipe, the protection pipe can be stably arranged at the time of construction even in an unstable construction location. However, a component having a cross section other than the U-shaped member may be used as a component of the protective tube.

本実施形態において、防護管の湾曲部において内側となる内周側湾曲面を、外側となるコ字状部材に結合部材を利用して結合している。これにより、内周側湾曲面が取り外し可能となり、コ字状部材の内部に複数の電線を整然と並べて配置できるため、施工や点検が容易になる。   In the present embodiment, the inner curved surface on the inner side in the curved portion of the protective tube is connected to the U-shaped member on the outer side using a connecting member. Thereby, the inner peripheral side curved surface can be removed, and a plurality of electric wires can be arranged neatly inside the U-shaped member, thereby facilitating construction and inspection.

本実施形態において、コ字状部材２４は、切込２７の間において、コ字状部材２４の開放端２３ｕが、湾曲部の曲率に適合して弧状に形成されている形態について説明した。しかし、開放端２３ｕは、弧状に形成されることなく、直線状であってもよい。その場合は、コ字状部材２４の開放端２３ｕが角を形成することになるため、その角に適応して内周側湾曲面２５を湾曲させればよい。   In the present embodiment, the U-shaped member 24 has been described in the form in which the open end 23u of the U-shaped member 24 is formed in an arc shape in conformity with the curvature of the curved portion between the cuts 27. However, the open end 23u may be straight without being formed in an arc shape. In this case, since the open end 23u of the U-shaped member 24 forms a corner, the inner peripheral side curved surface 25 may be curved according to the corner.

本実施形態において、側方湾曲面２３が複数の切込を有する形態について説明した。しかし、切込は、両側面の間で対向していれば、各側面に１つであってもよい。切込の数は、コ字状部材の形により、適宜変更することができる。また、切込がＶ字切込の場合、湾曲率に応じて、Ｖ字切込２７ｖのＶ字形状の角度と、Ｖ字切込２７ｖの数は、適宜変更することができる。   In the present embodiment, the form in which the side curved surface 23 has a plurality of cuts has been described. However, one cut may be provided on each side as long as the cuts face each other. The number of cuts can be appropriately changed depending on the shape of the U-shaped member. In the case where the cut is a V-shaped cut, the angle of the V-shaped cut of the V-shaped cut 27v and the number of V-shaped cuts 27v can be appropriately changed according to the curvature.

本実施形態において、防護管１は、直線管１０と湾曲管２０とに分けられ、湾曲管２０が湾曲部形成する形態について説明した。しかし、防護管１は、湾曲部を有すればよく、直線領域と湾曲部の両方を有する１つの管によって形成されてもよい。   In the present embodiment, the form in which the protection tube 1 is divided into the straight tube 10 and the curved tube 20 and the curved tube 20 forms a curved portion has been described. However, the protective tube 1 may have a curved portion, and may be formed by one tube having both a straight region and a curved portion.

本発明に係る防護管は、電線等の保護に利用できる。   The protective tube according to the present invention can be used for protecting electric wires and the like.

１ 防護管
１０ 直線管
２０ 湾曲管（湾曲部）
２１ 頂面
２２ 底面
２３ 側面
２３ｃ 開放端
２４ コ字状部材
２４ｏ 板状部材
２５ 内周側湾曲面
２６ 結合部材
２７ 切込
２７ｌ 直線状の切込
２７ｖ Ｖ字切込
３０ 連結部材
Ｌ 鉄道軌道
Ｋ 敷石 DESCRIPTION OF SYMBOLS 1 Protective tube 10 Straight tube 20 Curved tube (curved part)
DESCRIPTION OF SYMBOLS 21 Top surface 22 Bottom surface 23 Side surface 23c Open end 24 U-shaped member 24o Plate member 25 Inner peripheral curved surface 26 Joining member 27 Cut 27l Straight cut 27v V-shaped cut 30 Connecting member L Railway track K paving stone

Claims (12)

中空の筒状に形成され、中空部に挿通された他部材を防護する防護管であって、
所定の曲率半径で湾曲した湾曲部を有し、
前記湾曲部が、
前記曲率半径方向の外周側をなす外周側湾曲面と、
前記曲率半径方向の内周側をなす内周側湾曲面と、
前記外周側湾曲部及び内周側湾曲部の中間部をなし、対向するように配置された一対の側方湾曲面とを有し、
前記一対の側方湾曲面は、それぞれ前記曲率半径方向の一端側において前記外周側湾曲部あるいは前記内周側湾曲部に対して境界部を介して屈曲しつつ連続するように形成され、他端側が開放端とされると共に、前記開放端側から前記境界部が終点となるように切り込まれた切込を有し、
前記切込が、前記一対の側方湾曲面の間で対向する位置に設けられ、
前記外周側湾曲面あるいは前記内周側湾曲面のうち、前記終点に続くように設けられた面が、前記側方湾曲面の間で対向する前記切込の前記終点を相互に結ぶ仮想線を軸として前記所定の曲率半径で湾曲するように屈曲されていることを特徴とする、防護管。 A protection tube formed in a hollow cylindrical shape and protecting other members inserted in the hollow portion,
Having a curved portion curved with a predetermined radius of curvature,
The bending portion,
An outer peripheral side curved surface forming an outer peripheral side in the radius of curvature direction,
An inner peripheral side curved surface forming an inner peripheral side in the radius of curvature direction,
An intermediate portion between the outer curved portion and the inner curved portion, having a pair of side curved surfaces arranged to face each other,
The pair of side curved surfaces are formed so as to be continuous with the outer curved portion or the inner curved portion via a boundary portion at one end side in the radius of curvature direction, respectively, at the one end side, and the other end. The side is an open end, and has a cut cut from the open end side so that the boundary portion is an end point,
The notch is provided at a position facing between the pair of side curved surfaces,
Of the outer curved surface or the inner curved surface, a surface provided so as to follow the end point forms an imaginary line connecting the end points of the cuts facing each other between the side curved surfaces. A protective tube, which is bent so as to be curved at the predetermined radius of curvature as an axis. 前記外周側湾曲面及び前記内周側湾曲面のいずれか一方と、一対の側方湾曲面とにより、断面がコ字形状となるように形成されたコ字状部材と、
前記外周側湾曲面及び前記内周側湾曲面の他方を備え、前記コ字状部材において前記一対の側方湾曲面の開放端側を閉塞する蓋部材とを備えていることを特徴とする、請求項１に記載の防護管。 Any one of the outer curved surface and the inner curved surface, and a pair of side curved surfaces, a U-shaped member formed to have a U-shaped cross section,
A cover member for closing the open end side of the pair of side curved surfaces in the U-shaped member, comprising the other of the outer curved surface and the inner curved surface. The protective tube according to claim 1. 各側方湾曲面は少なくとも２つの前記切込を有し、
各側方湾曲面の開放端は、前記切込の間において、前記湾曲部の曲率に対応した弧状に形成されている、請求項１又は２に記載の防護管。 Each laterally curved surface has at least two said cuts,
The protection tube according to claim 1, wherein an open end of each side curved surface is formed in an arc shape corresponding to a curvature of the curved portion between the cuts. 前記切込は、Ｖ字形状のＶ字切込として設けられ、
前記Ｖ字切込は、各側方湾曲面において、前記外周側湾曲面との境界が前記Ｖ字形状の頂点となるように前記頂面部側から切り込まれ、
前記Ｖ字形状の両辺が近接するように、前記両側方湾曲面の間で対向する前記Ｖ字切込の前記頂点を相互に結ぶ仮想線を軸として前記外周側湾曲面が湾曲されて、近接した前記Ｖ字切込の両側辺を溶接することにより前記湾曲部が形成されている、請求項１〜３のいずれかに記載の防護管。 The notch is provided as a V-shaped notch,
The V-shaped cut is cut from the top surface side such that a boundary between the outer curved surface and the outer curved surface is a vertex of the V-shape in each side curved surface,
The outer peripheral side curved surface is curved around an imaginary line connecting the vertexes of the V-shaped cuts facing each other between the two side curved surfaces so that both sides of the V-shaped portion are close to each other. The protective tube according to any one of claims 1 to 3, wherein the curved portion is formed by welding both sides of the V-shaped cut formed. 前記両側方湾曲面の間で対向する前記Ｖ字切込は同一形状となるように設けられている、請求項４に記載の防護管。   The protection tube according to claim 4, wherein the V-shaped cuts facing each other between the two curved surfaces are provided to have the same shape. 前記内周側湾曲面が板状に形成されることにより、ロ字形状の断面を有する、請求項１〜５のいずれかに記載の防護管   The protective tube according to any one of claims 1 to 5, wherein the inner peripheral side curved surface is formed in a plate shape to have a square cross section. 金属材料で形成され、鉄道軌道の側方に内周側湾曲面を向けて配置される、請求項１〜６のいずれかに記載の防護管。   The protective tube according to any one of claims 1 to 6, wherein the protective tube is formed of a metal material, and is arranged with the inner peripheral curved surface facing the side of the railway track. 中空の筒状に形成され、中空部に挿通された他部材を防護する防護管の製造方法であって、
前記防護管が、所定の曲率半径で湾曲した湾曲部を有し、前記湾曲部が、前記曲率半径方向の外周側をなす外周側湾曲面と、前記曲率半径方向の内周側をなす内周側湾曲面と、前記外周側湾曲部及び内周側湾曲部の中間部をなし、対向するように配置された一対の側方湾曲面とを有するものであり、
前記外周側湾曲面及び前記内周側湾曲面のいずれか一方と、一対の側方湾曲面とにより、断面がコ字形状となるように形成されたコ字状部材を準備するコ字状部材準備工程と、
前記外周側湾曲面及び前記内周側湾曲面の他方を備えた蓋部材を、前記コ字状部材において前記一対の側方湾曲面の開放端側を閉塞するように結合させる結合工程とを含むことを特徴とする、防護管の製造方法。 A method for manufacturing a protective tube that is formed in a hollow cylindrical shape and protects other members inserted into the hollow portion,
The protective tube has a curved portion curved at a predetermined radius of curvature, and the curved portion has an outer peripheral curved surface forming an outer peripheral side in the radius of curvature direction and an inner periphery forming an inner peripheral side in the radius of curvature direction. A side curved surface, which constitutes an intermediate portion between the outer peripheral side curved portion and the inner peripheral side curved portion and has a pair of side curved surfaces arranged so as to face each other,
A U-shaped member that prepares a U-shaped member having a cross-section formed into a U-shape by any one of the outer curved surface and the inner curved surface and a pair of side curved surfaces. Preparation process,
Coupling a lid member provided with the other of the outer curved surface and the inner curved surface so as to close the open ends of the pair of lateral curved surfaces in the U-shaped member. A method for manufacturing a protective tube, characterized by the following. 前記コ字状部材準備工程は、
概略板状の板状部材の両側から略同一形状で対向する切込を設ける切断ステップと、
断面がコ字形状となるように、前記板状部材の両側を前記切込の前記終点で折り曲げる折曲ステップと、
前記両側方湾曲面の間で対向する前記切込の前記終点を相互に結ぶ仮想線を軸として前記外周側湾曲面を湾曲させる湾曲ステップとを含む、請求項８に記載の防護管の製造方法。 The U-shaped member preparing step,
A cutting step of providing cuts facing each other in substantially the same shape from both sides of the substantially plate-shaped plate member,
A bending step of bending both sides of the plate-shaped member at the end point of the cut so that the cross section has a U-shape,
The method of manufacturing a protective tube according to claim 8, further comprising: a bending step of bending the outer peripheral side curved surface around an imaginary line connecting the end points of the cuts facing each other between the both side curved surfaces. . 前記切断ステップは、前記コ字状部材の各側方湾曲面に、前記切込として少なくとも２つの前記Ｖ字切込を設けることと、
各側方湾曲面の前記開放端を、前記Ｖ字切込の間において、前記湾曲部の曲率に対応した弧状に切断することとを含む、請求項９に記載の防護管の製造方法。 The cutting step is to provide at least two of the V-shaped cuts as the cuts on each side curved surface of the U-shaped member,
The method according to claim 9, further comprising cutting the open end of each side curved surface into an arc shape corresponding to a curvature of the curved portion between the V-shaped cuts. 中空の筒状に形成され、中空部に挿通された他部材を防護するものであって、
所定の曲率半径で湾曲した湾曲部を有し、前記湾曲部が、前記曲率半径方向の外周側をなす外周側湾曲面と、前記曲率半径方向の内周側をなす内周側湾曲面と、前記外周側湾曲部及び内周側湾曲部の中間部をなし、対向するように配置された一対の側方湾曲面とを有する防護管の部品であって、
各側方湾曲面は、少なくとも１つの切込が前記両側方湾曲面の間で対向する位置に設けられ、
前記切込は、各側方湾曲面において、前記外周側湾曲面と前記両側方湾曲面の境界が終点となるように、前記コ字状部材の開放端から切り込まれ、
対向する前記切込の頂点を結ぶ仮想線を軸として前記外周側湾曲面が湾曲されることにより前記湾曲部が形成されていることを特徴とする、防護管の部品。 It is formed in a hollow cylindrical shape and protects other members inserted in the hollow portion,
Having a curved portion curved at a predetermined radius of curvature, the curved portion, an outer peripheral curved surface forming an outer peripheral side in the radius of curvature direction, and an inner peripheral side curved surface forming an inner peripheral side in the radius of curvature direction, A part of a protective tube having an intermediate portion between the outer curved portion and the inner curved portion, and having a pair of side curved surfaces arranged to face each other,
Each side curved surface is provided at a position where at least one cut is opposed between the two side curved surfaces,
The cut is cut from the open end of the U-shaped member, so that, in each side curved surface, a boundary between the outer peripheral side curved surface and the both side curved surfaces is an end point,
A part of the protection tube, wherein the curved portion is formed by bending the outer curved surface around an imaginary line connecting the vertices of the cuts facing each other. 前記切込は、Ｖ字形状のＶ字切込が前記両側方湾曲面の間で対向するように設けられ、
前記Ｖ字切込は、各側方湾曲面において、前記外周側湾曲面との境界が前記Ｖ字形状の頂点となるように前記開放端から切り込まれ、
前記Ｖ字形状の両辺が近接するように前記外周側湾曲面が湾曲されて、近接した前記Ｖ字切込の両側辺を溶接することにより前記湾曲部が形成されている、請求項１１に記載の防護管の部品。 The notch is provided such that the V-shaped notch of the V-shape faces between the curved surfaces on both sides,
The V-shaped cut is cut from the open end such that a boundary between the outer curved surface and the outer curved surface is a vertex of the V-shape in each side curved surface,
The outer peripheral side curved surface is curved so that both sides of the V-shape are close to each other, and the curved portion is formed by welding both sides of the close V-shaped cut. Parts of the protective tube.
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JP2014239589A (en) * 2013-06-06 2014-12-18 住友電装株式会社 Sheath material for wire harness
JP2017221956A (en) * 2016-06-14 2017-12-21 株式会社ティー・エム製作所 Elbow pipe manufacturing method and rectangular metal pipe

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