KR20210058442A - Spiral steel reinforcement multi-channeled duct for communication cable and manufacturing method thereof - Google Patents

Spiral steel reinforcement multi-channeled duct for communication cable and manufacturing method thereof Download PDF

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KR20210058442A
KR20210058442A KR1020190145902A KR20190145902A KR20210058442A KR 20210058442 A KR20210058442 A KR 20210058442A KR 1020190145902 A KR1020190145902 A KR 1020190145902A KR 20190145902 A KR20190145902 A KR 20190145902A KR 20210058442 A KR20210058442 A KR 20210058442A
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South Korea
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outer tube
pipe
spiral
tube
inner tubes
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KR1020190145902A
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Korean (ko)
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박문수
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박문수
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
    • F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
    • F16L1/06—Accessories therefor, e.g. anchors
    • F16L1/11—Accessories therefor, e.g. anchors for the detection or protection of pipes in the ground
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00—Rigid pipes
    • F16L9/12—Rigid pipes of plastics with or without reinforcement
    • F16L9/133—Rigid pipes of plastics with or without reinforcement the walls consisting of two layers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00—Rigid pipes
    • F16L9/18—Double-walled pipes; Multi-channel pipes or pipe assemblies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00—Rigid pipes
    • F16L9/22—Pipes composed of a plurality of segments

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

The present invention relates to a spiral steel-reinforced multi-pipe for a communication cable and a manufacturing method thereof. More particularly, the spiral steel-reinforced multi-pipe is capable of increasing resistance to earth pressure and other loads, received by being buried in the ground, and detecting a burial location accurately. In accordance with the present invention, a spiral steel-reinforced multi-pipe for a communication cable (100) comprises: a plurality of inner tubes (110) made of synthetic resin, and adjacent to each other, in contact with each other, and extended in parallel in the same direction, wherein each of the plurality of inner tubes has a space which can contain a cable; a single outer pipe (120) made of synthetic resin, and surrounding an outer surface of the inner tubes (110); and a spiral reinforcing steel material (130) inserted and disposed in a longitudinal direction between the outer surfaces of the inner tubes and an inner surface of the outer tube.

Description

통신케이블용 나선형 철재보강 다중관과 그의 제조방법{Spiral steel reinforcement multi-channeled duct for communication cable and manufacturing method thereof}Spiral steel reinforcement multi-channeled duct for communication cable and manufacturing method thereof

본 발명은 지중에 매설되어 받게 되는 토압이나 기타 하중에 대한 저항력을 증대시킴과 동시에 그 매설위치를 비교적 정확하게 탐지할 수 있도록 하는 통신케이블용 나선형 철재보강 다중관과 그의 제조방법에 관한 것이다.The present invention relates to a spiral steel reinforced multiplex pipe for a communication cable and a method of manufacturing the same, which increases the resistance against earth pressure or other loads received by being buried in the ground, while allowing the location of the buried to be relatively accurately detected.

도 1 및 도 2에 도시된 바와 같이, 일반적으로 지중에 매설되는 통신케이블용 다중관(1)은 토압에 대한 지지강성을 향상시키기 위하여 외부관(10)를 주름관체로 형성하고, 상기 외부관(10)의 내부에 복수의 내부관(20)으로 이루어지는 내부관 다발이 삽입된 구조로 이루어진다.As shown in FIGS. 1 and 2, the multiple pipe 1 for communication cables generally buried in the ground has an outer pipe 10 formed of a corrugated pipe body in order to improve the support stiffness against earth pressure, and the outer pipe ( 10) consists of a structure in which an inner tube bundle made of a plurality of inner tubes 20 is inserted.

상기 상기 외부관(10)와 내부관(20)은 폴리에틸렌과 같은 합성수지로 압출 성형되어 만들어지는 것이 일반적이다.The outer pipe 10 and the inner pipe 20 are generally made by extrusion molding of a synthetic resin such as polyethylene.

아울러, 상기 외부관(10)인 주름관체와 내부관(20) 사이에는 내부관 보호층(30)이 배치되어 있다. 상기 보호층(30)은 외부관(10)인 주름관체를 탈피시킬 때 내부관(20)의 손상을 방지함과 동시에 내부관(20)의 상대적인 신축을 억제하여 외부관(10)와 내부관(20)의 길이편차를 최소화시킨다.In addition, an inner tube protective layer 30 is disposed between the outer tube 10, the corrugated tube body and the inner tube 20. The protective layer 30 prevents damage to the inner tube 20 when removing the corrugated tube body, which is the outer tube 10, and at the same time suppresses the relative expansion and contraction of the outer tube 10 and the inner tube. Minimize the length deviation of (20).

이러한 종래의 통신케이블용 다중관(1)은 통신케이블의 변화에 따라서 점차적으로 그 직경이 작아지며, 미니트렌치 공법의 보급으로 지중에 매설되는 깊이도 얕아지는 경향이 있다.The conventional multi-pipe 1 for communication cables gradually decreases in diameter according to the change of communication cables, and the depth of buried underground tends to be shallow due to the spread of the mini trench construction method.

따라서, 지중에 매설되는 통신케이블용 다중관(1)은 매설물 탐지장치로 잘 탐지되지 못하는 성향이 있다. 이는 다른 매설물을 위한 토공사에서 합성수지로 이루어진 통신케이블용 다중관(1)이 공사 중에 용이하게 탐지되지 못하여서 손상되지 쉬운 결함을 가지게 한다.Therefore, the multi-pipe for communication cables (1) buried in the ground has a tendency to be difficult to detect well by the buried object detection device. This makes the multi-pipe (1) for communication cables made of synthetic resin in the earthwork for other buried objects not easily detected during construction and thus has a defect that is not easily damaged.

또한, 지중에 얕게 매설되는 통신케이블용 다중관(1)은 토압 뿐 아니라 기타 하중에도 대비하여 강도를 더욱 증대시킬 필요가 있다.In addition, it is necessary to further increase the strength of the multi-pipe for communication cables (1), which is shallowly buried in the ground, in preparation for not only earth pressure but also other loads.

국내등록실용신안공보 제10-1389592호Domestic Registration Utility Model Publication No. 10-1389592 국내등록실용신안공보 제10-0387196호Domestic Registration Utility Model Publication No. 10-0387196

본 발명의 목적은 지중에 매설되어 받게 되는 토압이나 기타 하중에 대한 저항력을 증대시킴과 동시에 그 매설위치를 비교적 정확하게 탐지할 수 있도록 하는 통신케이블용 통신케이블용 나선형 철재보강 다중관과 그의 제조방법을 제공하는 데 있다.An object of the present invention is to provide a spiral steel reinforced multiplex pipe for communication cables for communication cables and a method of manufacturing the same, which increases resistance to earth pressure or other loads received by being buried in the ground and enables relatively accurate detection of the buried location. To provide.

상기 목적을 달성하기 위해, 본 발명의 통신케이블용 나선형 철재보강 다중관은 합성수지로 이루어지며 인접하고 동일한 방향으로 평행하게 상호간에 맞닿아 연장되며 각자 케이블을 포함할 수 있는 공간을 가지는 복수의 내부관과, 합성수지로 이루어지며 상기 내부관들의 외면을 감싸는 하나의 외부관과, 상기 내부관들의 외면과 상기 외부관의 내면 사이에 길이방향으로 삽입 배치된 나선형 보강철재를 포함한다.In order to achieve the above object, the spiral steel reinforced multi-pipe for a communication cable of the present invention is made of synthetic resin and extends adjacent to each other in parallel in the same direction, and a plurality of inner pipes each having a space capable of containing a cable. And, one outer tube made of synthetic resin and surrounding the outer surfaces of the inner tubes, and a spiral reinforcing steel material inserted in the longitudinal direction between the outer surfaces of the inner tubes and the inner surface of the outer tube.

그리고, 본 발명의 통신케이블용 나선형 철재보강 다중관의 제작방법은 미리 성형된 복수의 내부관들을 모아서 상호간에 맞닿아 평행하게 접촉하는 내부관 다발을 형성하는 단계와, 외부관 성형 다이로 상기 내부관 다발을 삽입하는 내부관 다발의 삽입단계와, 상기 외부관 성형 다이로 삽입되는 내부관 다발의 외측에 보강철재를 나선형으로 감아주는 보강철재의 공급단계와, 상기 외부관 성형다이에 용융 합성수지를 공급하여서 삽입되는 상기 내부관 다발과 상기 나선형 보강철재의 외면에 외부관을 성형하면서 냉각시키는 외부관의 성형단계를 포함한다.In addition, the method of manufacturing a spiral steel reinforced multiple tube for a communication cable of the present invention comprises the steps of forming a bundle of inner tubes that are in contact with each other in parallel by collecting a plurality of pre-formed inner tubes, and the inner tube forming die with an outer tube forming die. The step of inserting the inner tube bundle to insert the tube bundle, the supplying step of spirally winding a reinforcing steel material on the outside of the inner tube bundle inserted into the outer tube forming die, and a molten synthetic resin in the outer tube forming die. And forming the inner tube bundle and the outer tube to be cooled while forming the outer tube on the outer surface of the spiral reinforcing iron material.

이와 같이 구성되는 본 발명은 보강철재가 상기 내부관들의 외면과 상기 외부관의 내면 사이에 그 길이를 따라서 나선형 보강 철재가 삽입되어 배치되는 구조를 가지므로, 매설물 탐지장치에서 용이하게 탐지되어서 다른 토공사의 실시과정에서 손상되는 위험을 최소화하며, 나선형의 보강철재는 토압이나 기타 하중에 대한 저항능력을 증대시키는 효과를 가진다.The present invention configured as described above has a structure in which a spiral reinforcing steel is inserted and disposed along its length between the outer surface of the inner pipes and the inner surface of the outer pipe. It minimizes the risk of damage in the process of implementation, and the spiral reinforcing steel has the effect of increasing the resistance to earth pressure and other loads.

도 1은 종래의 통신케이블용 다중관의 구성을 나타내는 사시도.
도 2는 종래의 통신케이블용 다중관의 횡단면도.
도 3은 본 발명에 따른 나선형 철재보강 다중관의 구성을 나타내는 사시도.
도 4는 본 발명에 따른 나선형 철재보강 다중관의 횡단면도.
도 5는 본 발명에 따른 나선형 철재보강 다중관의 길이방향 전단면도.
도 6은 본 발명의 통신케이블용 나선형 철재보강 다중관의 제조방법을 나타내는 도면.1 is a perspective view showing the configuration of a conventional multiple tube for communication cables.
Figure 2 is a cross-sectional view of a conventional multi-pipe for communication cables.
Figure 3 is a perspective view showing the configuration of a spiral steel reinforced multi-pipe according to the present invention.
Figure 4 is a cross-sectional view of the spiral steel reinforced multi-pipe according to the present invention.
Figure 5 is a longitudinal cross-sectional view of the spiral steel reinforced multi-pipe according to the present invention.
6 is a view showing a method of manufacturing a spiral steel reinforced multi-pipe for a communication cable of the present invention.

본 발명의 특징 및 이점들은 첨부도면에 의거한 다음의 바람직한 실시예에 대한 상세한 설명으로 더욱 명백해질 것이다. 이에 앞서, 본 명세서 및 청구범위에 사용된 용어나 단어는 발명자가 그 자신의 발명을 가장 최선의 방법으로 설명하기 위해 용어의 개념을 적절하게 정의할 수 있다는 원칙에 입각하여 본 발명의 기술적 사상에 부합하는 의미와 개념으로 해석되어야만 한다.Features and advantages of the present invention will become more apparent from the detailed description of the following preferred embodiments based on the accompanying drawings. Prior to this, terms or words used in the present specification and claims are based on the principle that the inventor can appropriately define the concept of the term in order to describe his or her invention in the best way. It must be interpreted as a corresponding meaning and concept.

이하, 본 발명의 일 실시예를 도면을 참조하여 상세히 설명함에 있어, 동일한 구성에 대해서는 동일한 부호를 사용하며, 명료성을 위하여 가능한 중복되지 않게 상이한 부분만을 주로 설명한다.Hereinafter, in describing an embodiment of the present invention in detail with reference to the drawings, the same reference numerals are used for the same configuration, and only different parts will be mainly described so as not to overlap as much as possible for clarity.

도 3 내지 도 5에 도시된 바와 같이, 본 발명의 통신케이블용 나선형 철재보강 다중관(100)은 내부관(110)과 외부관(120)과 나선형 보강철재(130)로 크게 구성된다.As shown in Figures 3 to 5, the spiral steel reinforced multi-pipe 100 for a communication cable of the present invention is largely composed of an inner tube 110, an outer tube 120 and a spiral reinforcing steel 130.

상기 내부관(110)은 케이블을 포함할 수 있는 공간을 가진 통상의 합성수지 통신용 관으로서 복수로 구비된다. 상기 내부관(110)은 폴리에틸렌 재질로 이루어지는 것이 바람직하다.The inner tube 110 is provided in plural as a conventional synthetic resin communication tube having a space capable of containing a cable. It is preferable that the inner tube 110 is made of a polyethylene material.

이와 같은 각각의 상기 내부관(110)들은 압출성형을 통해 제작되어 인접하고 동일한 방향으로 평행하게 상호간에 맞닿아 연장되도록 배치되어 다발형태를 이루게 된다.Each of the inner pipes 110 are manufactured through extrusion molding and arranged to extend in contact with each other in parallel in the same direction and adjacent to each other to form a bundle shape.

상기 외부관(120)은 내부관(110)들의 외면을 감싸는 공간을 가진 통상의 합성 수지 통신용 관으로서, 강성증대를 위하여 주름관체 형태로 형성되는 것이 바람직하다. 이와 같은 외부관(120)은 압출성형을 통해 제작된다. 또한, 상기 외부관(120)은 폴리에틸렌 또는 PVC와 같은 합성수지 재질로 이루어지는 것이 가능하며, 내관과 같은 재질인 폴리에틸렌으로 성형되는 것이 바람직하다.The outer pipe 120 is a conventional synthetic resin communication pipe having a space surrounding the outer surface of the inner pipes 110, and is preferably formed in the form of a corrugated pipe body to increase rigidity. Such an outer tube 120 is manufactured through extrusion molding. In addition, the outer pipe 120 may be made of a synthetic resin material such as polyethylene or PVC, and is preferably formed of polyethylene, which is the same material as the inner tube.

상기 나선형 보강철재(130)는 내부관(110)들의 외면과 상기 외부관(120)의 내면 사이에 위치된다. 상기 나선형 보강철재(130)는 와이어가 내부관(110)의 외측면에 길이방향을 따라 나선형태로 감겨진다.The spiral reinforcing steel 130 is located between the outer surface of the inner tube 110 and the inner surface of the outer tube 120. The spiral reinforcing iron 130 is wound around the outer surface of the inner tube 110 in a spiral shape along the longitudinal direction.

상기 나선형 보강철재(130)를 이루는 와이어는 금속탐지가 용이하도록 철선에 아연도금 또는 합성수지 피복 등을 통해 부식방지가 되도록 하는 것이 바람직하며, 원형 단면을 가지는 것으로 예시되지만, 필요에 따라 띠판형이나 반원형 등 다양한 단면형상을 가질 구도 있다.The wire forming the spiral reinforcing steel 130 is preferably made to prevent corrosion by galvanizing or coating a synthetic resin on the wire to facilitate detection of metal, and is exemplified as having a circular cross section. There are also spheres that have various cross-sectional shapes, such as.

이와 같이 구성된 본 발명의 통신케이블용 나선형 철재보강 다중관(100)은 다음과 같은 방법으로 제조된다.The spiral steel reinforced multiplex pipe 100 for a communication cable of the present invention configured as described above is manufactured by the following method.

도 6에 도시된 바와 같이, 미리 성형된 복수의 내부관(110)들을 모아서 상호간에 맞닿아 평행하게 접촉하는 내부관 다발을 형성시킨다.As shown in FIG. 6, a plurality of pre-formed inner tubes 110 are collected to form a bundle of inner tubes that are in contact with each other and in parallel contact with each other.

그리고, 외부관 성형다이(B)로 상기 내부관 다발을 삽입시킨다.Then, the inner tube bundle is inserted into the outer tube forming die (B).

외부관 성형다이(B)로 내부관 다발이 삽입되면, 상기 외부관 성형다이(B)로 삽입되는 내부관 다발의 외측에 보강철재(130)를 나선형으로 감아주게 된다.When the inner tube bundle is inserted into the outer tube forming die (B), the reinforcing steel 130 is spirally wound on the outside of the inner tube bundle inserted into the outer tube forming die (B).

이때, 보강철재(130)를 감아주기 위해서는 와이어 권취기(A)가 이용되는데, 상기 내부관 다발은 와이어 권취기(A)에 구비된 회전하는 와이어권취드럼(C)의 회전축을 관통하여 외부관 성형다이(B)로 삽입되며, 상기 와이어권취드럼(C)을 빠져나오는 과정에서 와이어권취드럼(C) 외측에 설치된 와이어 안내장비들이 내부관(110)의 외측에 와이어(W)를 나선형태로 감아서 보강철재(130)를 형성시키게 된다.At this time, a wire take-up machine (A) is used to wind the reinforcing steel material 130, and the inner tube bundle passes through the rotating shaft of the rotating wire take-up drum (C) provided in the wire take-up machine (A) and passes through the outer tube. It is inserted into the forming die (B), and in the process of exiting the wire winding drum (C), the wire guide equipment installed outside the wire winding drum (C) spirals the wire (W) on the outside of the inner tube (110). The reinforcing steel 130 is formed by winding.

한편, 외측에 보강철재(130)가 감겨진 상태로 외부관 성형다이(B)로 삽입되는 내부관 다발은 상기 외부관 성형다이(B)를 통과하는 과정에서 외부관 성형다이(B)로 공급되는 용융 합성수지를 통해 보강철재(130)의 외측에 외부관(120)이 성형된다.On the other hand, the inner tube bundle inserted into the outer tube forming die (B) while the reinforcing steel material 130 is wound on the outside is supplied to the outer tube forming die (B) in the process of passing through the outer tube forming die (B). The outer tube 120 is formed on the outside of the reinforcing iron 130 through the molten synthetic resin.

이때, 상기 외부관(120)의 외측에는 보강철재(130)의 나선 형태를 따라 나선형의 주름부가 자연스럽게 형성된다.At this time, a spiral corrugated portion is naturally formed along the spiral shape of the reinforcing steel 130 on the outside of the outer tube 120.

이와 같이 성형된 외부관(120)은 외부관 성형다이(B)를 빠져나온 뒤 냉각수 분사장치(D)를 거쳐 냉각과정을 거치게 되면, 외부관(130)이 수축되면서 내측에 위치된 내부관(110)과 보강철재(120)를 강하게 조여줌으로써 상기 내부관(110)과 보강철재(120)와 외부관(130)이 상호간에 견고한 결합상태를 이루는 본 발명의 통신케이블용 나선형 철재보강 다중관(100)이 완성된다.When the outer tube 120 molded in this way passes through the cooling water spraying device D after exiting the outer tube forming die (B), the outer tube 130 is contracted and the inner tube ( By strongly tightening the reinforcing steel 110) and the reinforcing steel 120, the inner tube 110, the reinforcing steel 120, and the outer tube 130 form a solid coupling state with each other. 100) is completed.

이와 같이, 도면을 참조하여 본 발명의 바람직한 실시예에 대해 상술하였으나 본 발명은 전술한 실시예에 한정되지 않으며, 본 발명이 속하는 기술분야에서 통상의 지식을 가진자가 본 발명의 사상을 벗어나지 않고 변형 가능하며, 이러한 변형은 본 발명의 권리범위에 속할 것이다.As described above, preferred embodiments of the present invention have been described above with reference to the drawings, but the present invention is not limited to the above-described embodiments, and those of ordinary skill in the art to which the present invention pertains are modified without departing from the spirit of the present invention. It is possible, and such modifications will fall within the scope of the present invention.

100...통신케이블용 나선형 철재보강 다중관
110...내부관 120...외부관
130...나선형 보강철재 A...와이어 권취기
B...외부관 성형다이 C...와이어권취드럼
D...냉각수 분사장치
100...Spiral steel reinforced multiple pipe for communication cable
110...inner tube 120...outer tube
130...Spiral reinforcement steel A...Wire winder
B...Outer tube forming die C...Wire winding drum
D...coolant spray device

Claims (2)

합성수지로 이루어지며, 인접하고 동일한 방향으로 평행하게 상호간에 맞닿아 연장되며 각자 케이블을 포함할 수 있는 공간을 가지는 복수의 내부관;
합성수지로 이루어지며, 상기 내부관들의 외면을 감싸는 하나의 외부관; 및
상기 내부관들의 외면과 상기 외부관의 내면 사이에 길이방향으로 삽입 배치된 나선형 보강철재를 포함하는 통신케이블용 나선형 철재보강 다중관.
A plurality of inner tubes made of synthetic resin and extending in contact with each other in parallel in the same direction and adjacent to each other, and each having a space capable of containing a cable;
One outer tube made of synthetic resin and surrounding the outer surfaces of the inner tubes; And
Spiral steel reinforced multiple pipes for communication cables comprising a spiral reinforcing iron inserted in the longitudinal direction between the outer surface of the inner pipes and the inner surface of the outer pipe.
 (a) 미리 성형된 복수의 내부관들을 모아서 상호간에 맞닿아 평행하게 접촉하는 내부관 다발을 형성하는 단계;
(b) 외부관 성형다이로 상기 내부관 다발을 삽입하는 내부관 다발의 삽입단계;
(c) 상기 외부관 성형다이로 삽입되는 내부관 다발의 외측에 보강철재를 나선형으로 감아주는 보강철재의 공급단계;
(d) 상기 외부관 성형다이에 용융 합성수지를 공급하여서 삽입되는 상기 내부관 다발과 상기 나선형 보강철재의 외면에 외부관을 성형하면서 냉각시키는 외부관의 성형단계를 포함하는 통신케이블용 나선형 철재 보강 다중관의 제조방법.
(a) forming a bundle of inner tubes that are in contact with each other in parallel by collecting a plurality of preformed inner tubes;
(b) inserting an inner tube bundle of inserting the inner tube bundle into an outer tube forming die;
(c) a step of supplying a reinforcing steel material for spirally winding a reinforcing steel material on the outside of the bundle of inner tubes inserted into the outer tube forming die;
(d) a spiral steel reinforcement multiple for communication cables comprising the step of forming an outer tube to cool while forming an outer tube on the outer surface of the inner tube bundle and the outer tube to be inserted by supplying molten synthetic resin to the outer tube forming die. How to make a tube.
KR1020190145902A 2019-11-14 2019-11-14 Spiral steel reinforcement multi-channeled duct for communication cable and manufacturing method thereof KR20210058442A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100387196B1 (en) 1999-06-30 2003-06-18 변무원 Apparatus for Producing Multiple Channel Duct Assembly and Method thereof
KR101389592B1 (en) 2012-11-16 2014-05-07 케이유피피(주) Optical fiber cable protection tube

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100387196B1 (en) 1999-06-30 2003-06-18 변무원 Apparatus for Producing Multiple Channel Duct Assembly and Method thereof
KR101389592B1 (en) 2012-11-16 2014-05-07 케이유피피(주) Optical fiber cable protection tube

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