JPH0741870U - Surface smooth type overhead wire - Google Patents

Abstract

(57) [Summary] [Structure] An aluminum element wire 2 having a fan-shaped cross-section is twisted around a central metal tube 1, and an aluminum element wire 3 having a fan-shaped cross section is laid on it.
Were twisted together, and as the outermost layer, an aluminum element wire 4 having a fan-shaped cross section and having a ridge 5 in the longitudinal direction of the inner peripheral surface was twisted thereon. The aluminum strands 4 having the ridges 5 are twisted together so that the ridges 5 can be inserted into the grooves between the strands 3 of the layer below the outermost layer. [Effect] Since the ridges of the outermost layer wires enter the grooves between the wires of the layer below it, even if there is some dimensional variation in the wires or if external force is applied, The outer layer wire is hard to move, and therefore, the outermost layer wire is less likely to be dislocated, loosened, or rotated.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a surface smooth type overhead wire used as an overhead power transmission line or an overhead ground wire.

[0002]

[Prior art]

 FIG. 3 shows an example of a conventional surface smooth type overhead wire. This surface smooth type overhead wire has a metal tube 1 such as an aluminum alloy tube arranged in the center, and a fan-shaped aluminum element wire (or aluminum alloy element wire) 2 twisted around it and the cross section as the outermost layer. A fan-shaped aluminum element wire (or aluminum alloy element wire) 3 is twisted together. This electric wire accommodates an optical fiber in the central metal tube 1 and is used as an optical fiber composite overhead wire.

[0003]

[Problems to be solved by the device]

 Since the surface-smooth overhead wire is made by twisting wires with a fan-shaped cross section into the outermost layer, if even one wire with irregular dimensions is twisted into the outermost layer or the layers below it, the outermost layer There is a problem in that the wires become unsteady and the balance of the wires as a whole is lost, and the wires in the outermost layer tend to come apart, loosen, or rotate during overhanging.

[0004]

[Means for Solving the Problems]

 The present invention provides an overhead wire that solves the above problems, and has a structure in which the outermost layer is a wire having a fan-shaped cross section and a ridge in the longitudinal direction of the inner peripheral surface. It is characterized in that it is twisted so that it can be inserted into the groove between the wires of the layer below the outer layer.

[0005]

[Action]

 This makes it difficult for the outermost layer wires to move due to the engagement between the ridges of the outermost layer wires and the grooves between the wires in the layers below it, making it difficult for the outermost layer wires to move. Is less likely to occur.

[0006]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an embodiment of the present invention. This surface-smooth overhead wire is made by twisting a fan-shaped aluminum element wire (or aluminum alloy element wire) 2 around a central metal tube 1 and then forming a fan-shaped aluminum element wire (or aluminum alloy element wire) on top of it. ) 3 are twisted together, and as the outermost layer, an aluminum element wire (or an aluminum alloy element wire) 4 having a fan-shaped cross section and a ridge 5 in the longitudinal direction of the inner peripheral surface is twisted together. The aluminum strands 4 having the ridges 5 are twisted together so that the ridges 5 can be inserted into the grooves between the strands 3 of the layer below the outermost layer.

FIG. 2 shows another embodiment of the present invention. This surface smooth type overhead wire has a steel stranded wire 6 in which a plurality of aluminum-coated steel wires are twisted together in the center, and an aluminum wire (or aluminum alloy wire) 7 with a fan-shaped cross section is twisted around it. An aluminum element wire (or an aluminum alloy element wire) having a circular cross section is twisted on top of it, and an aluminum element wire (or an aluminum element wire having a fan-shaped cross section in the longitudinal direction of the inner peripheral surface) is formed as the outermost layer on it. Alloy wire 4) is twisted together. The aluminum strands 4 having the ridges 5 are twisted so that the ridges 5 can be inserted into the grooves between the strands 8 of the layer below the outermost layer.

As the element wire, for example, a copper wire or the like can be used in addition to the aluminum wire.

[0009]

[Effect of device]

 As described above, in the surface smooth type overhead wire of the present invention, the protrusions of the outermost layer wire enter the groove between the wires in the layer below the wire, so that there is some variation in the size of the wire. The outermost layer wire is less likely to move even when there is an external force, and therefore there is an advantage that the outermost layer wire is less likely to be dislocated, loosened, or rotated.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a surface smooth type overhead wire of the present invention.

FIG. 2 is a sectional view showing another embodiment of the surface smooth type overhead wire of the present invention.

FIG. 3 is a cross-sectional view showing an example of a conventional surface smooth type overhead wire.

[Explanation of symbols]

 1: Metal tube 2, 3: Fan-shaped aluminum element cross section 4: Aluminum element wire having fan-shaped cross section and protrusions 5 on the inner peripheral surface 6: Steel stranded wire made by twisting aluminum-coated steel wires 7: Fan-shaped aluminum section Wire 8: Aluminum wire with circular cross section

Claims (1)

[Scope of utility model registration request] 1. A strand having a fan-shaped cross-section having a ridge in the longitudinal direction of the inner peripheral surface is twisted in the outermost layer so that the ridge is inserted into the groove between the strands of the layer below the outermost layer. Surface smooth type overhead wire characterized by combining.