JP2004173367A - Antenna support column - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antenna support column that allows easy installation including the installation of a cable, comprises a structure bearable to a wind load, and is superior in anti-corrosion property. <P>SOLUTION: A groove 1a in which the cable 20 is inserted along the longitudinal direction is formed at the external peripheral surface of a hollow pipe shape. The groove 1a is small compared with the outside diameter w of the cable 20, and has a uniform width w1. The opening width of the groove 1a may be small compared with at least the outside diameter w of the cable 20. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an antenna support column used as a support column of a tower such as a relay station on which an antenna device or the like is installed and having a function of supporting the antenna device and attaching a cable.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a relay tower or the like on which an antenna device is installed is provided on a roof of a relay station or the like, and the relay tower supports the antenna device by an antenna support column. For example, FIG. 10 is a diagram showing a schematic configuration of a conventional relay device. In this relay device, a tower-like skeletal frame body 105 formed by assembling steel frames is provided on the roof of a relay station 106, and the upper portion thereof is provided. An antenna supporting column 101 is provided, and a plurality of antenna main bodies 103 including an antenna device and a radome are provided on a peripheral surface of the antenna supporting column 101.
[0003]
Here, since the relay station is installed on the top of a mountain or the like, the antenna support pillar is required to be lightweight so that the installation work of the relay tower is easy. Further, since the relay tower is exposed to rain, wind, snow, and the like, it is required that the relay tower has a structure that can withstand a wind load and has long-term corrosion resistance.
[0004]
As the conventional antenna support column 101, a hollow steel pipe having a sectional shape as shown in FIG. 11 has been used. This hollow steel pipe has sufficient strength to withstand wind loads, but is inferior in corrosion resistance. Therefore, the surface of the steel pipe has been subjected to a rust-proof treatment of painting or plating. For this reason, it took a lot of time and labor to manufacture the antenna support column 101. Further, since the hollow steel pipe is heavy, it is difficult to perform an installation work by hand. Therefore, the installation work is performed by transporting the steel pipe using a crane or the like. Therefore, a great deal of time and labor is required for the installation work.
[0005]
In order to solve the rust prevention treatment and the difficulty of installation work associated with such a hollow steel pipe, an aluminum antenna support column has been devised. Due to the characteristics of aluminum, this aluminum antenna support column is lighter than a steel pipe even if it is a thick pipe with the same strength as a steel pipe, so installation work is easy and corrosion resistance is excellent. Therefore, there is an advantage that rust prevention treatment is unnecessary.
[0006]
When a conventional steel pipe or aluminum pipe antenna supporting column is used, the cable 102 between the antenna main bodies 103 or between the antenna main body 103 and the fixing flange 104 supporting the antenna supporting column 101 is formed as shown in FIG. In order to hang outside the side surface of the antenna support column, a cable support device having a structure protruding outside the antenna support column is newly provided as in a cable support device described in Patent Document 1, for example. To support the cable.
[0007]
[Patent Document 1]
JP-A-2002-262445
[Problems to be solved by the invention]
However, in the case of supporting the cable as described above, there is a problem that the number of cable support tools and cables to be attached to the outside of the antenna support column is increased, and the number of installation steps is increased.
[0009]
In addition, since the cable support attached to the antenna support column protrudes outside the antenna support column, there is a problem that the strength of the antenna support column needs to be increased by receiving a wind load.
[0010]
In addition, because the cables attached to the cable supports are also exposed to the outside, measures to prevent such damage in areas that are susceptible to bird and animal damage, such as wrapping stainless steel tape around the cables to prevent damage to the cables, can be used. There was also a problem that measures had to be taken.
[0011]
The present invention has been made in view of the above, and an object of the present invention is to provide an antenna support column which has a structure that can easily perform installation work including mounting of a cable, withstands a wind load, and has excellent corrosion resistance.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, the antenna support pillar according to claim 1 is characterized in that a groove into which a cable is inserted is provided on an outer peripheral surface of a hollow pipe along a longitudinal direction.
[0013]
According to the first aspect of the present invention, since the groove into which the cable is inserted is provided along the longitudinal direction on the outer peripheral surface of the hollow pipe, the groove and the cable are inserted so as to have a gap, and do not protrude separately with a hose band or the like. Or by setting the groove width small and press-fitting the cable into the groove, there is no need to provide a cable support for attaching the cable, and since the cable is not exposed to the outside of the hollow pipe, wind load and snow It can have a structure that can withstand the heat.
[0014]
The antenna support column according to claim 2 is characterized in that, in the above invention, the groove has a cross-sectional opening width smaller than an outer diameter of the cable.
[0015]
According to the second aspect of the present invention, since the opening width of the groove is smaller than the outer diameter of the cable, the cable is press-fitted into the groove so that the cable can be inserted into the groove without requiring a separate fixing means. Can be fixed.
[0016]
According to a third aspect of the present invention, in the above-mentioned invention, the width of the inside of the cross section of the groove is smaller than the opening width.
[0017]
According to the third aspect of the present invention, the inner width of the groove is set to be equal to or less than the opening width, that is, the cable is press-fitted by the groove having a simple sectional shape that is perpendicular or widened toward the opening. be able to.
[0018]
According to a fourth aspect of the present invention, in the above-described invention, the groove has a portion having a width inside the cross section equal to or larger than the opening width.
[0019]
According to the fourth aspect of the present invention, by forming the groove having a portion in which the inside width of the groove is equal to or larger than the opening width, the cable is most crushed when passing through the opening, and After passing through, the cable can be inserted with a relatively light force, but since the opening has a width smaller than the diameter of the cable, the inserted cable does not jump out.
[0020]
According to a fifth aspect of the present invention, in the antenna support column described above, an inner width of the groove cross section is smaller than an outer diameter of the cable.
[0021]
According to the fifth aspect of the present invention, since the width of the inside of the groove is made smaller than the outer diameter of the cable, the cable is securely press-fitted and fitted into the inside of the groove. Jumping out can be reliably suppressed.
[0022]
According to a sixth aspect of the present invention, in the antenna support column, the groove is provided for each cable disposed along a longitudinal direction of the hollow pipe.
[0023]
According to the invention of claim 6, since the groove is provided for each cable arranged along the longitudinal direction of the hollow pipe, each cable can be securely attached to the antenna support column.
[0024]
Further, the antenna support column according to claim 7 is characterized in that, in the above invention, each groove is provided for a plurality of cables.
[0025]
According to the seventh aspect of the present invention, each groove is provided for each of a plurality of cables, and the cable can be efficiently attached to the antenna support column.
[0026]
The antenna support column according to claim 8 is characterized in that, in the above invention, a cross-sectional shape of the hollow pipe is circular or polygonal.
[0027]
According to the invention of claim 8, the cross-sectional shape of the hollow pipe is circular or polygonal, so that the wind load and the amount of snow applied to the antenna support column can be reduced.
[0028]
According to a ninth aspect of the present invention, in the above-mentioned invention, the hollow pipe is integrally formed of an extruded aluminum material.
[0029]
According to the ninth aspect of the present invention, since the hollow pipe is integrally formed from an aluminum extruded material having a low specific gravity, the installation work of the antenna support column and the cable is further facilitated and the corrosion resistance is excellent. An antenna support column can be realized.
[0030]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of an antenna support column according to the present invention will be described in detail with reference to the accompanying drawings.
[0031]
(Embodiment 1)
FIG. 1 is a diagram showing a part of a relay tower using an antenna support column according to a first embodiment of the present invention. In FIG. 1, an antenna support column 1 is fixed to a fixing flange 4, and an antenna body 3 including an antenna device and a radome is installed in multiple stages. The cable 2 such as a feeder line to the antenna body 3 is attached to the antenna support column 1 by being press-fitted into a groove provided along the longitudinal direction on the outer peripheral surface of the antenna support column 1. It does not protrude outside.
[0032]
FIG. 2 is a diagram illustrating a structure of a vertical section of the antenna support column. As shown in FIG. 2, four grooves 1a are provided on the outer peripheral surface of the antenna support column 1 at every 90 degrees in the circumferential direction. The opening of the groove 1a has a width w1, but the width w1 is smaller than the outer diameter w of the cable 20 before being pressed into the groove 1a. As a result, the cable 20 is press-fitted into the groove 1a by using the elasticity of the outer cover of the cable 20, and attached as the cable 2 in the groove 1a. Further, since the width inside the groove is equal to or smaller than the width w1 of the opening, that is, since the groove 1a has a simple shape that is perpendicular or widened toward the opening, processing can be easily performed when providing the groove 1a. . The difference between the width w1 and the outer diameter w is determined by the elastic force of the cable.
[0033]
When this antenna support column 1 is used, the worker simply press-fits the cable 20 into the groove 1a, so that the cable installation work becomes easy. On the other hand, since the cable 2 is accommodated in the groove 1a and does not protrude onto the outer peripheral surface of the antenna support column 1, the wind load and the amount of snow can be reduced. For example, when the length of the antenna support column 1 is 2.5 m, the outer diameter is 180 mm, and the outer diameter of the cable is 25 mm, as compared with the cable mounting state using the conventional antenna support column shown in FIG. The wind load was reduced by about 30%. In addition, since the cable 2 itself is present inside the groove 1a, measures against bird and animal damage are also taken.
[0034]
As shown in FIG. 3, after the cable 2 is press-fitted into the groove 1a, the lid 223 may be further press-fitted into the groove 1a. Like the cable 2, the lid 22 has a width larger than the width w1 of the opening of the groove 1a, and is a band-shaped elastic member corresponding to the groove 1a. The width of the lid 22 is determined by the elastic force of the lid 22, and can be realized by a resin or the like as an elastic body. By further press-fitting the lid 22 after press-fitting the cable 2, circumferential irregularities of the antenna support column 1 are alleviated, and the wind load can be further reduced. In addition, since the cable 2 is not exposed to the outside of the outer peripheral surface of the antenna support column 1, reliable measures against birds and animals can be taken at the same time. Although the cross-sectional shape of the lid 22 is rectangular in FIG. 3, the lid 22 can be mounted more reliably by making the inner shape correspond to the cross-sectional shape of the cable.
[0035]
Here, the antenna support column 1 is integrally formed by extrusion of aluminum, and there is no need to provide a cable support for attaching the cable 2. In addition, since the antenna support column 1 is made of aluminum having a small specific gravity, the antenna support column 1 is lightweight even if it has a plate thickness having the same strength as a steel pipe. Becomes easier. In addition, since aluminum itself is excellent in corrosion resistance, it is not necessary to perform rust prevention treatment such as painting or plating, and the antenna support column 1 having a simple configuration and low cost can be realized.
[0036]
In the first embodiment described above, one groove 1a is provided at every 90 degrees in the circumferential direction of the antenna support column 1, but the invention is not limited to this, and a plurality of grooves may be provided. For example, as shown in FIG. 4, two grooves 11a and 11b may be provided adjacent to each other at every 90 degrees in the circumferential direction of the antenna support column 11.
[0037]
Further, a plurality of grooves may be arranged at one place in the circumferential direction. For example, as shown in FIG. 5, the grooves 12a to 12d may be provided adjacent to each other at one position in the circumferential direction of the antenna support column 12. It is preferable that the positional relationships among such grooves 1a, 11a, 11b, 12a to 12d correspond to the positional relationships of the antenna body 3, respectively.
[0038]
(Embodiment 2)
Next, a second embodiment of the present invention will be described. Each of the antenna support columns 1, 11, and 12 shown in the above-described first embodiment has a circular cross section, but in the second embodiment, the cross section has a polygonal shape.
[0039]
FIG. 6 is a diagram showing a cross-sectional shape of the antenna support column according to the second embodiment of the present invention. In FIG. 6, the cross-sectional shape of the antenna support column 13 is close to a regular hexagon. Generally, when air flows along the outer surface of the antenna support column 13, a variable lift is generated, and Karman vortices are generated alternately on the downstream side of the air in the antenna support column 13, and the antenna support column 13 vibrates. The occurrence of this vibration can be reduced by optimizing the separation point of the air along the outer surface of the antenna support column 13. That is, by setting the cross section of the antenna support column 13 to an optimal polygonal shape, the air separation point can be optimized, and the wind load can be further reduced.
[0040]
(Embodiment 3)
Next, a third embodiment of the present invention will be described. Although the widths of the grooves of the antenna support columns shown in the first embodiment are all uniform widths w1, in the third embodiment, the opening width w2 at the opening of the groove is outside the cable 20. It is designed to be smaller than the diameter.
[0041]
FIG. 7 is a diagram showing a cross-sectional shape of the antenna support column according to the third embodiment of the present invention. In FIG. 7, the groove 14a provided in the longitudinal direction of the outer peripheral surface of the antenna support column 14 is not uniform in width, the opening width w2 in the opening is smaller than the outer diameter w of the cable 20, and The width w3 inside the groove 14a is larger than the opening width w2. As a result, when the cable 20 passes through the opening width w2, the cable 20 is pressed into the groove 14a by using the elasticity of the outer skin, but after passing through the opening width w2, the cable 20 is inserted into the groove 14a with a relatively light force. And the cable 20 can be reliably prevented from jumping out of the groove.
[0042]
When the width w3 of the inside of the groove 14a is smaller than the outer diameter w of the cable 20, the cable 20 can be securely attached. When the inner diameter w3 is larger than the outer diameter w, Can insert the cable 20 into the groove 14a with a light force. In this case, a gap is formed between the groove 14a and the cable 2a. However, since the opening width w2 is smaller than the outer diameter w of the cable 20, there is no protrusion to the outside of the groove. This is because the function can be exhibited.
[0043]
In this embodiment, the groove 14a does not necessarily have to have a uniform cross-sectional shape in the longitudinal direction, and if at least a part of the cross-sectional shape is as described above, the groove 14a protrudes to the outside of the groove. Effects such as prevention can be achieved.
[0044]
(Embodiment 4)
Next, a fourth embodiment of the present invention will be described. In the above-described first to third embodiments, one groove is used to attach one cable to one groove. In the fourth embodiment, a plurality of cables are attached to one groove.
[0045]
FIG. 8 is a diagram showing a cross-sectional shape of the antenna support column according to the fourth embodiment of the present invention. In FIG. 8, the bottom of the groove 15a extends in the radial direction, and the two cables 2a and 2b can be attached thereto. The groove 15a shown in FIG. 8 has a uniform width w1 similarly to the groove 1a shown in FIG. Thereby, the cables 2a and 2b which are larger than the number of the grooves 15a can be attached to the antenna support pillar 15 with a small opening. Further, it is not always necessary to attach two cables 2a and 2b to each groove 15a, and only one cable 2b may be attached. In this case, it is preferable that the wind load can be reduced by attaching to the opening side.
[0046]
Although the plurality of cables 2a and 2b are attached to the groove 15a shown in FIG. 8 as the groove 15a extending in the radial direction, the groove 15a is not limited to this, and may be a groove extending in the circumferential direction. The groove may be a compound groove whose bottom portion extends obliquely.
[0047]
By the way, in the above-described first to fourth embodiments, the shape of the groove and the cable correspond to each other. However, when the outer diameter of the cable is smaller than the inner diameter or the width of the groove, FIG. As described above, the elastic ring 31 whose one end is open may be externally fitted to the cable 30 and pressed into the groove 1a.
[0048]
【The invention's effect】
As described above, according to the present invention, since the groove into which the cable is press-fitted along the longitudinal direction is provided on the outer peripheral surface of the hollow pipe, there is no need to provide a cable support for attaching the cable, Since the installation work of the antenna support column and the cable is facilitated, and the cable is not exposed to the outside of the hollow pipe, it is possible to provide a structure that can withstand wind load and snow and snow, and also to prevent bird and animal damage.
[0049]
Further, according to the present invention, by making the opening width of the groove smaller than the outer diameter of the cable, the cable is press-fitted into the groove from the opening, and the cable does not jump out. This has the effect that it is possible to securely mount the.
[0050]
Further, according to the present invention, by making the cross-sectional shape of the hollow pipe circular or polygonal, it is possible to reduce the wind load or the amount of snow applied to the antenna support column.
[0051]
Further, according to the present invention, the hollow pipe is integrally formed from an extruded material of aluminum having a low specific gravity, so that the installation work of the antenna support pillar and the cable is further facilitated, and the antenna support having excellent corrosion resistance is provided. This has the effect of realizing pillars.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a partial configuration of a relay tower including an antenna support column according to a first embodiment of the present invention.
FIG. 2 is a diagram showing a cross-sectional structure of an antenna support column according to the first embodiment of the present invention.
FIG. 3 is a diagram showing a cross-sectional structure of an antenna support column according to a first modification of the first embodiment of the present invention.
FIG. 4 is a diagram showing a cross-sectional structure of an antenna support column according to a second modification of the first embodiment of the present invention.
FIG. 5 is a diagram showing a cross-sectional structure of an antenna support column according to a third modification of the first embodiment of the present invention.
FIG. 6 is a diagram showing a cross-sectional structure of an antenna support column according to a second embodiment of the present invention.
FIG. 7 is a diagram showing a cross-sectional structure of an antenna support column according to a third embodiment of the present invention.
FIG. 8 is a diagram showing a cross-sectional structure of an antenna support column according to a fourth embodiment of the present invention.
FIG. 9 is a view showing a cable attachment state when the outer diameter of the cable is smaller than the inner diameter of the groove.
FIG. 10 is a diagram showing a schematic configuration of a conventional relay tower.
FIG. 11 is a diagram showing a cross-sectional structure of a conventional antenna support column.
FIG. 12 is a diagram showing a relationship between a conventional antenna support column and a cable.
[Explanation of symbols]
1, 11, 12, 13, 14, 15 Antenna support columns 1a, 11a, 11b, 12a to 12d, 14a, 15a Grooves 2, 2a to 2d, 20, 30 Cable 3 Antenna body 4 Fixing flange 22 Lid 31 Ring

Claims (9)

An antenna supporting column, wherein a groove into which a cable is inserted along a longitudinal direction is provided on an outer peripheral surface of a hollow pipe. The antenna support column according to claim 1, wherein the groove has a cross-sectional opening width smaller than an outer diameter of the cable. The antenna support column according to claim 2, wherein the width of the groove is equal to or smaller than the width of the opening inside the cross section. The antenna support column according to claim 2, wherein the groove has a portion having a width inside the cross section that is equal to or larger than the opening width. The antenna support column according to claim 4, wherein an inner width of the cross section is smaller than an outer diameter of the cable. The antenna support column according to any one of claims 1 to 5, wherein the groove is provided for each cable disposed along a longitudinal direction of the hollow pipe. The antenna support column according to claim 1, wherein each groove is provided for each of a plurality of cables. The antenna support column according to claim 1, wherein a cross-sectional shape of the hollow pipe is circular or polygonal. The antenna support column according to any one of claims 1 to 8, wherein the hollow pipe is integrally formed of an extruded aluminum material.

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