JP2003273616A - Communication tower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an effective communication tower in place of a steel tower. <P>SOLUTION: In a communication tower 1 in which communication equipment 3 for transmitting/receiving communication signals is integrated inside the top of an independent cylindrical tower body 2, the tower body is formed from a cylinder 4 composed of a fiber reinforced resin having magnetic permeability as a whole, and a reinforcing steel frame 5 composed of steel covers the area except for the periphery of the communication equipment. The reinforcing steel frame is composed of a plurality of inner flanges vertically located at intervals inside the tower body and a number of pipes supported by the inner flanges, extended vertically and arrayed at intervals along the inner peripheral surface of the tower body. The tower body is formed as a plurality of vertically divided modules and the tower body is assembled by linking the modules by binding the inner flanges of the reinforcing steel frame. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication tower installed as a relay antenna for broadcasting and portable telephones.

[0002]

2. Description of the Related Art As a communication tower of this type, it has been customary to install various kinds of communication equipment in an exposed state on the top of a steel tower assembled from steel.

[0003]

However, in the conventional communication tower in which the communication equipment is exposed at the top of the steel tower as described above, it is necessary to make the communication equipment weatherproof and Even if it has weather resistance, its durability naturally has a limit, and wind, snow, freezing, dust, ultraviolet rays,
Communication devices are easily damaged by various factors such as harmful gas, lightning, birds and insects, and frequent inspection and maintenance work is essential. Furthermore, the durability of the steel tower itself is not always perfect, and extensive maintenance work is required, such as requiring regular full-scale painting.

As a communication tower of this type, for example, as disclosed in Japanese Unexamined Patent Publication No. 2000-286621, a hollow portion covered with a magnetically permeable material such as fiber reinforced resin is secured in at least a part thereof, and the inside thereof is secured. It has also been proposed to install communication equipment in. According to this, by installing the communication device in the hollow part in a concealed state, inspection and maintenance work can be reduced, but it is not always satisfactory in terms of strength, durability, and workability, and there is room for improvement. Was left.

[0005]

In view of the above circumstances, the invention of claim 1 is a communication tower in which a communication device for transmitting and receiving a communication signal is incorporated inside the top of a self-supporting cylindrical tower body. The main body is composed of a tubular body formed of a fiber-reinforced resin having magnetic permeability, and a stiffening frame made of steel incorporated inside the tubular body in a range excluding the periphery of communication equipment. And

According to a second aspect of the present invention, in the first aspect of the invention, the stiffening frame has a plurality of inner flanges vertically spaced inside the tubular body, and the tubular body supported by the inner flanges. It is characterized by comprising a number of pipe members extending in the up-down direction along the inner peripheral surface and arranged at intervals in the circumferential direction.

According to a third aspect of the present invention, in the second aspect of the present invention, the tower body is formed by connecting a plurality of vertically divided modules, and the modules are formed by fastening inner flanges of the stiffening frame to each other. It is characterized in that the tower body is assembled by being connected.

[0008]

1 to 4 show an embodiment of the present invention. FIG. 1 shows an overall appearance of a communication tower 1 of the present embodiment, which is a cylindrical tower main body 2 that is self-supporting and a communication equipment installation space is secured inside the top portion thereof, and a communication equipment 3 is installed therein. It is said that it was installed in a hidden state.

The tower main body 2 has a total of five stages of modules, that is, a base module 2A, three stages of intermediate modules 2B,
The top module 2C is configured to be vertically connected. In each of these modules, a cylindrical body 4 formed of a fiber-reinforced resin, so-called FRP, is mainly used, and in the base module 2A and the intermediate module 2B, a stiffening frame 5 made of steel is integrally incorporated therein. It was the one.

The fiber-reinforced resin, which is the main body of the tubular body 4, may be any fiber-reinforced resin having a desired strength, but at least as a material for forming the top module 2C, it is transparent so as not to hinder signal transfer. A material having magnetism, specifically, a fiber reinforced resin such as glass fiber, aramid fiber, nylon fiber or the like can be preferably used.

Further, a stiffening frame 5 incorporated in the cylindrical body 4 of the base module 2A and the intermediate module 2B.
As shown in FIG. 2, the annular inner flanges 5a are provided in the cylindrical body 4 in multiple stages (for example, five stages as shown in the drawing) at intervals in the vertical direction, and are supported by the inner flanges 5a. The tubular body 4 is made up of a large number (for example, 16 pipes 5b as shown in the figure) of pipe members 5b extending along the inner peripheral surface of the tubular body 4 and arranged at intervals in the circumferential direction. It is reinforced from the inside and has excellent strength.

As shown in FIG. 1, the base module 2A of this embodiment has a taper portion whose upper portion is tapered, and therefore the stiffening frame 5 incorporated therein also corresponds to the shape of the taper portion. It is said to have been done. An opening 6 for inspection is provided on the side surface of the base module 2A.

Further, the top end of the top module 2C is closed by a top plate 7, and the communication device 3 is installed in the inside in a concealed state. A stiffening frame is not provided inside the top module 2C, and as shown in FIG. 2, an inner flange 5a for connecting to the middle module 2B is provided at a lower portion of the tubular body 4 thereof.
Only one is provided. Top module 2C
The reason why the stiffening frame is omitted in the above is that if a stiffening frame made of steel is provided around the communication device 3, it may hinder signal transmission / reception. Since strength is not required, there is no particular problem even if the stiffening frame is omitted. However, if necessary, an appropriate stiffening frame may be provided in a range that does not hinder signal exchange (that is, in a range excluding the periphery of the communication device 3). It is also conceivable to increase the strength by increasing the thickness of the fiber reinforced resin forming the cylinder 4 in the top module 2C as compared with other modules.

In the construction of the tower main body 2 described above, the base module 2A is built on the ground through an appropriate foundation (not shown), and the three intermediate modules 2B are sequentially connected to the base module 2A. , Further middle module 2B
To the top module 2C. The modules are connected to each other by fastening both inner flanges 5a with bolts 8 as shown in FIG. Then, the respective modules are connected in such a manner to make the tower main body 2 stand alone, and the communication device 3 is installed in the top module 2C.
The communication tower 1 is completed by installing.

Although the size of the communication tower 1 is not limited in any way, an example of a case where the communication tower 1 is provided as a relay antenna for broadcasting and portable telephones is, for example, about 25 m in total height and 1.6 m in outer diameter (base portion). It is realistic to set the height of each module to about 1.3 m (from the middle to the top) and about 4 to 5 m. Further, the thickness of the tubular body 4 made of the fiber-reinforced resin of each module is about 6 to 8 mm to obtain sufficient strength, but the top module 2C without the stiffening frame is provided.
Then, it is preferable to make the thickness as thick as about 23 mm. In addition, it is optional to install a ladder or landing inside if necessary.

In the communication tower 1 having the above-mentioned structure, the communication equipment 3 is installed in a concealed state on the top of the cylindrical tower body 2 mainly made of fiber reinforced resin, so the communication equipment is installed on the top of the steel tower in an exposed state. Compared with the conventional communication tower, the communication device 3 is less likely to be damaged, its durability can be improved, and maintenance and inspection work for it can be significantly reduced. Since resin is naturally superior in weather resistance and durability compared to steel materials, the maintenance work required for conventional steel towers can be greatly reduced. Therefore, the life cycle cost can be sufficiently reduced.

Further, the tower body 2 can be assembled and self-standing as it is by simply connecting the prefabricated modules. Since each module is mainly made of fiber reinforced resin, it is extremely lightweight and easy to handle. Since large heavy machinery is not required, the construction is much easier than the case of assembling a steel tower, and the construction cost can be sufficiently reduced. Moreover, since it is an almost straight and smart cylindrical shape that is self-supporting, the site can be minimized,
It matches well with the natural landscape.

Further, although the tower main body 2 is mainly composed of fiber reinforced resin, since the stiffening frame 5 consisting of the steel inner flange 5a and the pipe material 5b is provided inside the tower main body 2, it is of course possible to secure sufficient strength. The stiffening frame 5 itself is also a birdcage-like one, and it is lightweight and has sufficient strength. Moreover, by simply fastening the inner flanges 5a of the stiffening frame 5, the modules can be connected easily and securely and firmly. can do.

It should be noted that although it is preferable that the tower main body 2 has a cylindrical shape as in the above-described embodiment because it is less susceptible to wind resistance and is aesthetically advantageous, it is also conceivable that the tower main body 2 has a rectangular tube shape or other cross-sectional shape. Further, the shape and size of each module and the number of modules may be determined according to the overall scale and shape, and the form of the stiffening frame 5 in each module and the form of connection between the modules may be appropriately changed. To be

[0020]

According to the first aspect of the present invention, a communication device is incorporated inside the top of a self-supporting tubular tower body, and the tower body is mainly formed of a tubular body made of a fiber-reinforced resin having magnetic permeability. In addition, since the stiffening frame made of steel is integrated inside the area excluding the periphery of the communication device, the durability can be improved by installing the communication device in a concealed state, and The maintenance and inspection work for it can be significantly reduced, and the tower itself is naturally excellent in weather resistance and durability, so that the life cycle cost can be sufficiently reduced as compared with the conventional communication tower using a general steel tower.

According to the second aspect of the present invention, the stiffening frame provided in the tower main body has a birdcage shape composed of the inner flange and a large number of pipe members, so that the strength of the tower main body can be sufficiently ensured.

According to the third aspect of the present invention, since the tower main body is modularized and the modules are fastened together to assemble the tower main body, the tower main body can be constructed very easily.

[Brief description of drawings]

FIG. 1 is a diagram showing an appearance of a communication tower that is an embodiment of the present invention.

FIG. 2 is a partial vertical sectional view of the same.

FIG. 3 is a plan sectional view of the same.

FIG. 4 is a detailed view of the connecting portion of the module.

[Explanation of symbols]

1 communication tower 2 tower body 2A base module 2B middle module 2C top module 3 communication equipment 4 cylinder 5 Stiffening frame 5a Inner flange 5b Pipe material 6 openings 7 Top plate 8 volt

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Keisuke Yonemaru             Shimizu Construction 1-3-2 Shibaura, Minato-ku, Tokyo             Within the corporation F term (reference) 5J046 AA06 AA15 AB00 RA03 RA06                       RA12 RA13                 5J047 AA10 AA14 AA15 AB00 BG05                       BG08 BG10

Claims (3)

[Claims] 1. A communication tower in which a communication device for transmitting and receiving communication signals is incorporated inside the top of a self-supporting tubular tower body, the tower body being a tubular body formed of a fiber-reinforced resin having magnetic permeability. And a steel stiffening frame incorporated inside the tubular body in a range excluding the periphery of the communication device, and a communication tower. 2. The stiffening frame includes a plurality of inner flanges arranged vertically at intervals inside a tubular body, and a plurality of inner flanges extending in the up-down direction along an inner peripheral surface of the tubular body supported by the inner flanges. The communication tower according to claim 1, wherein the communication tower is composed of a large number of pipe members arranged at intervals in the circumferential direction. 3. The tower body is formed by connecting a plurality of vertically divided modules, and the tower body is assembled by connecting these modules by fastening inner flanges of a stiffening frame. The communication tower according to claim 2, wherein: