JP2006156016A - Aerially installed long object - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a long object installed aerially and capable of reducing a receiving wind pressure load applied to it when it is installed aerially. <P>SOLUTION: A low resistance electric wire 100 is provided with a plurality of recess parts 150 formed on the outer circumferential face 120 of an electric wire main body 110 and provided with corner parts 153. Each of a plurality of recess parts 150 is shaped into a diamond shape. a plurality of recess parts 150 are arranged on the outer circumferential face 120 at equal intervals so that respective vertex parts in a pair of opposite corner parts are arranged on the plane crossing the axis of the electric wire main body 110 at right angles. In a plurality of recess parts 150, the adjacent side parts are parallel to each other. By means of a plurality of recess parts 150, the pressure wind load received by the outer circumferential face of the electric wire main body 110 can be lowered. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an aerial laid long object such as a low resistance electric wire that is erected and receives wind pressure.

  2. Description of the Related Art Conventionally, long objects that are installed overhead include power transmission lines, wires, and the like that are formed of overhead installed conductors, and cables that are coated with a coating material such as resin on the conductors.

  In these installed long objects, the outer peripheral surface of a long object such as an overhead power transmission line or wire has small irregularities formed by twisting strands having a circular cross section, and the outer peripheral surface of a long object such as a cable. Since the outer shell is formed by the outer peripheral surface of a circular covering material, it is generally smooth.

  In this way, when the aerial object is installed as it is, it receives a wind pressure load. For example, when wind pressure is received on one side of a long object, a high pressure region is generated on one side that is the windward side, and a low pressure region is generated on the other side that is leeward. Pressed to the side.

  For this reason, a long thing is constructed between support bodies, such as a utility pole and a steel tower, which can respond to the wind pressure characteristic of being pressed to the other side. Therefore, if the wind pressure load received by the long object installed in the aerial can be reduced, the strength of the support can be reduced to reduce the size and the installation cost.

For example, in Patent Document 1, the outermost layer strand of the stranded wire in the overhead power transmission line is configured by a plurality of segment-shaped strands with rounded corners, so that the power transmission line is respectively provided on the outer peripheral surface of the overhead power transmission line. A plurality of grooves extending in the axial direction are formed. In Patent Document 1, the wind pressure load is greatly reduced by the groove on the outer peripheral surface as compared with the electric wire having a circular cross section.
JP 57-90809 A

  In such an aerial laying long object such as an aerial power transmission line, it is desirable to have a structure that reduces as much as possible the wind pressure load that is received when the aerial laying is actually carried out between supports. Therefore, it is desired that the wind pressure load received is further reduced as compared with Patent Document 1.

  The present invention has been made in view of the above points, and an object thereof is to provide an aerial laying long object that can reduce the wind pressure load received by itself even when the aerial laying is performed.

  The aerial laying long object of the present invention employs a configuration in which a convex part that is bent in a direction intersecting the axial direction of the long object main body is formed on the outer peripheral surface of the long object main body.

  According to this structure, since the convex part formed in the outer peripheral surface of a long thing main body is bent in the direction which cross | intersects the axial direction of a long thing main body, the wind which an outer peripheral surface receives can be disperse | distributed to an axial direction. Therefore, it is possible to reduce the wind pressure load received by the entire overhead laying long object. Thereby, the intensity | strength of the support body which supports an aerial laying elongate object can be reduced, and size reduction and reduction of laying cost can be aimed at.

  In the above configuration, the aerial laying long object of the present invention adopts a configuration in which a plurality of the convex portions are formed on the outer peripheral surface side by side in the circumferential direction of the long object main body.

  According to this configuration, since the plurality of convex portions that are bent in the direction intersecting the axial direction of the long object body are formed side by side in the circumferential direction of the long object body, the wind that goes around in the circumferential direction on the outer peripheral surface is formed. Can be dispersed in the axial direction. Therefore, it is possible to reduce the wind pressure load received by the entire overhead laying long object.

  In the above configuration, the aerial laying long object of the present invention adopts a configuration in which the convex portions are bent in the same direction.

  According to this configuration, wind that circulates in the circumferential direction can be dispersed in the axial direction on the outer peripheral surface. Therefore, it is possible to reduce the wind pressure load received by the entire overhead laying long object.

  The aerial laying long object of the present invention adopts a configuration in which a recess having a corner is formed on the outer peripheral surface of the long object body. In addition, it is desirable that a plurality of the recessed portions are formed on the outer peripheral surface of the long object main body, and may be formed over the entire outer peripheral surface of the long object main body.

  According to this structure, since the hollow part which has a corner | angular part is formed in the outer peripheral surface of a long thing main body, when an aerial cloth installation long thing is blown by the wind, a corner | angular part is a hollow part of an outer peripheral surface. It is possible to reduce the wind pressure load received by the entire aerial laying long object by dispersing the wind that has entered.

  In the above-described configuration, the aerial laying long object of the present invention has a lattice-like convex portion formed on the outer peripheral surface of the long object body, and the hollow portion is partitioned on the outer peripheral surface by the lattice-like convex portion. Therefore, a configuration in which a plurality are formed at equal intervals is adopted.

  According to this configuration, since a plurality of depressions are formed on the outer peripheral surface of the long object main body by the grid-like convex portions, the wind pressure load that the aerial laying long object receives over the entire aerial laying long object Can be reduced.

  In the above-described configuration, the aerial laying long object of the present invention is characterized in that the opening shape of the recess is a rhombus.

  According to this structure, the wind pressure load which an aerial laying long object receives can be reduced.

  In the above-described configuration, the aerial laying long object of the present invention has a configuration in which two corners facing each other in each of the plurality of depressions are arranged at positions aligned in a direction perpendicular to the axis of the long object body. Take.

  According to this configuration, since the two opposing corners in each of the recesses on the outer peripheral surface are arranged at positions aligned in a direction perpendicular to the axis of the long object body, the respective recesses face each other. Wind that circulates in the circumferential direction by the corners can be dispersed in the axial direction. Therefore, it is possible to reduce the wind pressure load received by the entire overhead laying long object.

  The aerial laying long object of the present invention adopts a configuration in which the opening shape of the recess is a hexagon in the above configuration.

  According to this configuration, since the hollow portion is hexagonal, the wind received when the aerial laying long object is laid at each corner can be dispersed, and the wind pressure load received by the aerial laying long object Can be reduced more effectively.

  As described above, according to the present invention, the wind pressure load received by itself can be more effectively reduced even when it is installed overhead.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 is a partial cross-sectional view showing an aerial laying long object according to Embodiment 1 of the present invention. 2 is a cross-sectional view taken along line AA ′ in FIG. In this embodiment, the aerial laying long object is described as a low-resistance electric wire (cable) 100 in which a conductor is covered with a covering material. However, the present invention is not limited to this. Any fictitious long object may be used. For example, the aerial laid long object may be a wire, more specifically, a corrosion-resistant aluminum alloy round bar.

  A low resistance electric wire 100 shown in FIGS. 1 and 2 is a long one obtained by covering a conductor 101 with a covering material 102, and is laid over an aerial space between support members arranged separately, such as a steel tower, for example. .

  In the low resistance electric wire 100, a convex portion 130 protruding from the outer peripheral surface 120 is formed on the outer peripheral surface 120 of the electric wire main body (long object main body) 110 formed by the covering material 102. The convex portion 130 is formed of the electric wire main body. 110 includes a protrusion 131 bent in a direction intersecting the axial direction of 110.

  Here, it is assumed that the protruding portion 131 includes two protruding side portions 133 that extend in a direction that intersects the axial direction of the electric wire body 110.

  The convex portion 130 forms a lattice shape by a plurality of protrusions 131 provided on the outer peripheral surface 120, in other words, a plurality of protrusion sides 133.

  The outer peripheral surface 120 is formed with a plurality of depressions 150 that are partitioned by a grid-like convex portion 130. The dent 150 is defined as having a corner by a corner that is formed at a portion of the protrusion 130 where the ridge side 133 intersects.

  The hollow portion 150 has a rhombus opening shape, that is, a rectangular shape when viewed from the outside of the electric wire body 110, in this case, a rhombus shape. And these hollow part 150 is arrange | positioned along with the mutual side part adjacent to the electric wire main body 110, the outer surface part of the coating | covering material 102 in detail.

  The depth of these dents 150 is, for example, 0.1 mm to 1.0 mm. In other words, the protruding height of the convex portion 130 from the outer peripheral surface 120 is 0.1 mm to 1.0 mm.

  And these hollow parts 150 have the corner | angular parts 151-154 formed by the convex part 130, and the protrusion side part 133 which comprises the protruding protrusion part 131 in detail.

  Of the corner portions 151 to 154 in each of the plurality of recess portions 150, two opposite corner portions (for example, corner portions 152 and 153 in FIG. 1) are arranged in a direction orthogonal to the axis B of the electric wire body 110. Placed in position. In other words, in the rhombic depression 150 in this embodiment, the apex portions of the pair of opposing corners 152 and 153 are located on a plane orthogonal to the axis B.

  That is, since the corners 152 and 153 facing each other in the recess 150 are arranged in a direction orthogonal to the axis B, the recesses 150 adjacent to each other in the direction orthogonal to the axis B are formed by the protrusions 131 that bend in the same direction. It has a corner portion (for example, corner portion 152).

  These corners 152 and 153 distribute the received wind in the axial direction. In addition, the rhombus-shaped hollow part 150 in the low resistance electric wire 100 has a diagonal length between the corners 151 and 154 arranged in the direction of the axis B of the electric wire body 110 larger than the diagonal length between the corners 152 and 153. It has been long.

  The effect by the low resistance electric wire 100 is demonstrated with reference to FIG. Here, among the plurality of depressions 150 shown in FIG. 1, depressions 150-1 and 150-2 arranged in the direction orthogonal to the axial direction are used. For example, the low resistance electric wire 100 is from the direction indicated by the arrow C in FIG. A local case of receiving wind pressure will be described.

  In the low-resistance electric wire 100, the wind received by the hollow portion 150-1 from the outside is dispersed in the axial direction by the corner portion 152-1 of the hollow portion 150-1. Next, the dispersed wind enters the hollow portion 150-2 and, together with the corner portion 152 of the hollow portion 150-2, forms a ridge portion 131 (specifically, the ridge side portion). 133 and 133 and their joint portions) are further dispersed in the axial direction. In other words, the vortex of the airflow is less likely to occur on the side opposite to the side receiving the wind as the wind passage. Since such an effect occurs on the entire outer peripheral surface of the low-resistance wire 100, the wind pressure received by the low-resistance wire 100 is reduced.

  FIG. 3 is a diagram showing the relationship between the drag coefficient of the low resistance electric wire 100 of this embodiment and the wind speed. The drag coefficient is equivalent to the wind pressure. In FIG. 3, the drag coefficient of the low resistance electric wire 100 of the present embodiment is shown by a graph D, and the drag coefficient of a conventional electric wire having a circular cross section is shown by a graph E.

  As shown in FIG. 3, according to the low resistance electric wire 100, the drag coefficient is reduced by about 40% compared to a conventional electric wire having a circular cross section.

  As described above, according to the present embodiment, a plurality of rhombus-shaped depressions 150 having the corners 151 to 154 are formed on the outer peripheral surface of the electric wire main body 110, so that the wind received by the corners 151 to 154 can be reduced. Dispersed flow can reduce the wind pressure load.

  In particular, since the air flowing in the circumferential direction can be dispersed in the axial direction by the corner portions 152 and 153 in each of the plurality of hollow portions 150 formed on the outer peripheral surface 120, the wind pressure load received by the entire low resistance electric wire 100 can be reduced. It can be drastically reduced. In the low-resistance electric wire 100, the drag coefficient (corresponding to wind pressure load) can be reduced by about 40% compared to a conventional electric wire having a circular cross section.

  In addition, according to the present embodiment, when snow adheres to the outer peripheral surface 110 of the low-resistance electric wire 100 during snowfall, the outer peripheral surface 110 is formed with the convex portion 130 and the recess portion 150, so that the low resistance The electric wire 100 itself rotates due to the weight of snow. Therefore, in the low resistance electric wire 100, it is possible to reduce a load caused by snow adhesion during snowfall.

  In the above embodiment, the convex portion 130 has a lattice shape. However, the present invention is not limited to this, and the convex portion 130 protruding from the outer peripheral surface 120 may have a portion bent in a direction intersecting the axial direction. Any method may be used.

  For example, a protruding portion (convex portion) having a shape bent in a V shape on the outer peripheral surface of the electric wire is set so that the bending direction of the bent portion intersects the axial direction, that is, the protruding portion constituting the bent portion. A plurality of the two side portions may be arranged so as to be arranged so as to intersect with the axis of the electric wire body. Further, when a plurality of V-shaped protrusions are formed on the outer peripheral surface, they may be provided over the entire outer peripheral surface at equal intervals. When a plurality of V-shaped protrusions are provided on the outer peripheral surface of the electric wire body, the entire plurality of V-shaped protrusions correspond to the protrusions 130 of the low-resistance electric wire 100.

  In addition, for example, a long ridge (projection) extending in a zigzag along the axial direction may be formed on the outer peripheral surface of the electric wire, and the zigzag ridge is further formed on the outer periphery of the electric wire. It is good also as a structure formed in order in the surface along the axial direction. In that case, you may arrange | position so that a mutual bending part may be bent in the same direction, or may be bent in a different direction.

(Embodiment 2)
FIG. 4 is a partial cross-sectional view showing an aerial laying long object according to Embodiment 2 of the present invention. 5 is a cross-sectional view taken along line FF ′ in FIG. In this embodiment, the aerial laying long object is described as a low-resistance electric wire (cable) 200 in which a conductor is covered with a covering material. Any aerial long object placed between the support members may be used.

  The low resistance electric wire 200 shown in FIGS. 4 and 5 is different only in the shape of the recess 150 in the low resistance electric wire 100 shown in FIGS. 1 and 2, and the other configurations are the same. Therefore, only a different structure is demonstrated and description is abbreviate | omitted about the structure similar to the low resistance electric wire 100. FIG.

  In this low resistance electric wire 200, a plurality of hollow portions 250 are formed at equal intervals on the outer peripheral surface 220 of the electric wire main body (long object main body) 210 formed by the covering material 202 covering the conductor 201.

  These hollow portions 250 are partitioned by convex portions 230 protruding from the outer peripheral surface 220, with the opening shape of the hollow portions 250 being hexagonal, that is, hexagonal when viewed from the outside of the electric wire body 210.

  The depth of the hollow part 250 is, for example, 0.1 mm to 1.0 mm. In other words, the protruding height of the convex portion 230 from the outer peripheral surface 220 is 0.1 mm to 1.0 mm.

  A pair of corners 251 and 252 facing each other in the recess 250 are arranged side by side in a direction orthogonal to the axis of the electric wire body 210. In other words, the corners 251 and 252 are located on a plane orthogonal to the axis of the electric wire body 210. Note that each of the corner portions 251 and 252 is formed by a bent portion (specifically, a corner portion in the bent portion) that is bent in a direction intersecting the axial direction of the electric wire body 210 in the convex portion 230. These corners 251 and 252 flow the received wind in a distributed manner in the axial direction.

  The effect of this low resistance electric wire 200 is substantially the same as that of the low resistance electric wire 100. That is, the wind received by the corners of the plurality of depressions 250 is dispersed and circulated in the circumferential direction to disperse the air vortex generated on the surface opposite to the surface receiving the wind. The wind pressure load received can be reduced. In particular, in the present embodiment, the low-resistance electric wire 200 has a plurality of hexagonal depressions 250, so that the wind received at each corner of the depressions 250 is dispersed, and the electric wire body 210 itself receives more effectively. Feather wind pressure load is reduced.

  In addition, the shape of the recessed part 150,250 in the low resistance electric wire 100,200 in each embodiment is not limited to this, It is a recessed part which has a corner | angular part, The 2 side part of the convex part which forms a corner | angular part As long as they extend in a direction crossing the axial direction, they may have any shape.

  In addition, the size, number, etc. of the depressions in the aerial laying long object can be appropriately changed so as to have an effect of reducing the wind pressure load received by the low resistance electric wire (an aerial laying elongated object) having the depressions. Of course.

  The aerial laying long object according to the present invention has an effect of reducing the wind pressure load received when it is laid, and is useful as an aerial laid electric wire.

The fragmentary sectional view which shows the aerial laying long thing which concerns on Embodiment 1 of this invention A-A 'arrow sectional view of FIG. The figure which shows the relationship between the drag coefficient and the wind speed of the aerial laying long object which concerns on Embodiment 1 of this invention. Partial sectional view showing an aerial laying long object according to Embodiment 2 of the present invention F-F 'line sectional view of FIG.

Explanation of symbols

100, 200 Low resistance electric wire 101, 201 Conductor 110, 210 Electric wire main body 120, 220 Outer peripheral surface 130, 230 Convex part 131 Protruding part 133 Protruding side part 150, 250 Depressed part 152, 153, 251, 252 Corner part

Claims (8)

  An aerial laying long object characterized in that a convex part that is bent in a direction intersecting the axial direction of the long object main body is formed on the outer peripheral surface of the long object main body.   2. The overhead laying long object according to claim 1, wherein a plurality of the convex portions are formed on the outer peripheral surface side by side in the circumferential direction of the long object main body.   The aerial laying long object according to claim 2, wherein the convex portions are bent in the same direction.   An aerial laying long object, wherein a hollow part having a corner is formed on an outer peripheral surface of a long object body. A grid-like convex part is formed on the outer peripheral surface of the long object body,
The aerial laying elongate according to claim 4, wherein a plurality of the recessed portions are formed at equal intervals on the outer peripheral surface by being partitioned by the lattice-shaped convex portions.   The aerial laying long object according to claim 4 or 5, wherein an opening shape of the recess is a rhombus.   The aerial laying length according to claim 5 or 6, wherein two corners facing each other in each of the plurality of depressions are arranged at positions aligned in a direction orthogonal to an axis of the elongated object body. Scales.   The aerial laying long object according to claim 4, wherein an opening shape of the recess is a hexagon.

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