JP2008005215A - Base frame structure for self-supported antenna - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a base frame structure for a self-supported antenna that reduces an occupied area thereof and the number of members and enables to obtain a base frame in a fixed shape without changing its size and shape according to a region and a height that an antenna is installed in the base frame for a roof-installation type self-supported antenna. <P>SOLUTION: The base frame 2 for a self-supported antenna 1 is composed of base beams 10, which comprise three or four or the like H-section steel or the like arranged radially from the column 3 position at the center of the frame, so as to make it as the tripod or tetrapod or the like base frame 2. A counterweight 12 is provided at the tip of each base beam 10. The weight of the counterweight 12 is increased or decreased corresponding to a wind load or an earthquake force. Consequently, it is possible to further increase a resisting overturning moment against the wind load or the earthquake force, compared with the case when providing the counterweight at the center of the frame while enabling to cope with the wind load or the earthquake force without changing the size and shape of the base frame 2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a basic frame structure of a self-supporting antenna installed on the roof of a building.

  One of the relay antennas used in a mobile phone system is a free-standing antenna installed on the roof of a building. The roof-mounted self-supporting antenna includes, for example, a foundation frame installed on the roof of a building, a pillar standing upward from the center of the foundation frame, and a pillar at the top of the pillar. An antenna arm that is radially arranged toward the outside and an antenna (such as four types or eight types) that protrude vertically upward from the tip of each antenna arm is used. Yes.

  In the conventional basic frame, for example, a large number of vertical beams made of H-shaped steel are arranged in parallel at intervals, and these multiple vertical beams are connected by a plurality of horizontal beams arranged in a direction perpendicular to the upper surface thereof. A rectangular shape was used.

  The roof-mounted self-supporting antenna is installed on the roof of an existing building, so if the foundation frame is fixed to the roof surface with anchors, the roof surface will be scratched, its waterproofness will be reduced, and construction will also be extensive Therefore, the foundation frame is installed on the roof surface without using an anchor.

  In such a roof-mounted self-supporting antenna, it is necessary to prevent the antenna from falling or slipping due to the assumed wind load and seismic force, but the wind load and seismic force may vary depending on the area and height where the antenna is installed. Because of the large change, the size and shape of the foundation frame are changed in the conventional foundation frame in accordance with the variation in wind load and seismic force.

  There are Patent Documents 1 and 2 as prior art documents related to the present invention. The invention of Patent Document 1 is an antenna mounting base for installing a relay antenna of a simple mobile phone system on a rooftop of a building without using an anchor, and is a radial and cross-shaped structure configured by combining two horizontal members. Flat weights are stacked on the center of the assembly-type weight base, and an antenna mounting stand that is commercially available for BS / CS antennas is placed on top of it, and these are fixed with bolts, without using anchors. It can be installed firmly and is easy to transport to the rooftop.

  The invention of Patent Document 2 is a wiring construction method on a roof where wiring work such as an antenna can be performed on the roof of an existing building in a short construction period without affecting the waterproofing of the building, and a wire is held at the upper end of the roof parapet Attach the tool to the appropriate place, install the antenna body through the block on the roof surface, stretch the wire between the wire holders or between the wire holder and the antenna body, and connect the communication line to this wire The power supply line including it is held.

JP-A-9-107217 JP 2003-70134 A

  In the case of a conventional basic frame in which a large number of steel materials as described above are combined in a square shape, there are the following problems.

  (1) In order to prevent the antenna from falling or slipping due to wind load or seismic force, the planar shape must be increased, which occupies a large area and may hinder the installation of the rooftop of existing buildings. Also, rattling is likely to occur due to unevenness of the roof surface.

  (2) Since many steel materials are combined in a square shape, the number of members is large, the cost increases, and it takes time to transport and assemble to the rooftop.

  (3) It is necessary to change the size and shape of the basic frame depending on the area and height where the antenna is installed, and the cost cannot be reduced by mass production.

  The present invention provides a roof-mounted self-supporting antenna base frame that can occupy a small area, reduce the number of members, and has a fixed shape without changing the size or shape depending on the area and height where the antenna is installed. A base frame structure of a self-supporting antenna capable of obtaining a base frame is provided.

  The invention according to claim 1 of the present invention is a foundation frame structure of a self-supporting antenna installed on a roof, and a plurality of foundation beams (H-shaped steel and other shaped steels) are directed outward from the center of the foundation frame. A base frame structure of a self-supporting antenna, which is arranged on a roof surface through cushioning material supports (rubber bearings, etc.) disposed radially and provided on the bottom surface of the tip of each base beam. .

  For example, as shown in FIG. 1, three foundation beams are arranged at equal intervals in a horizontal plane to form a tripod-like foundation frame, and the tip of each foundation beam is grounded to the roof surface via a cushioning material support, A stable three-point support is preferable. An antenna post is erected from the center of the base frame, and an upright antenna of, for example, eight types or four types is provided on the upper side of the column. Note that the number of basic beams is not limited to three, and may be four or more in some cases.

  Since the foundation frame is configured with a radial arrangement of a plurality of foundation beams, it occupies a small area for installing a self-supporting antenna and can be installed on the roof of an existing building without any trouble. In particular, in the case of a tripod-shaped foundation frame, since the tip of the foundation beam is supported at three points, there is no backlash due to unevenness of the roof surface, and a stable installation state can be obtained. Since the number of members is small, the flow of force is simple, the design is easy, the cost can be reduced, and transportation and assembly to the roof are easy. Since it is lightweight and is supported by a cushioning material support such as rubber, it can be installed without damaging the roof surface of the building. In addition, since it is supported by a cushioning material support such as rubber at the tip of each foundation beam, it does not easily fall over, and the rubber or other cushioning material support does not cause a slip even during an earthquake.

  According to a second aspect of the present invention, in the basic frame structure of the self-standing antenna according to the first aspect, a counterweight is provided at a tip portion of each basic beam, and the counterweight according to wind load or seismic force. The basic frame structure of a self-supporting antenna, wherein the weight of the antenna is increased or decreased.

  The counter weight is used to prevent the antenna from falling or slipping due to wind load or seismic force. For example, as shown in Fig. 2, a plate-like weight is used for the counter weight, and the weight is adjusted by increasing or decreasing the number. To do. By increasing or decreasing the weight of the counterweight according to wind load or seismic force, it is possible to respond without changing the size or shape of the foundation frame. Further, by providing a counterweight at the tip of each foundation beam, the resistance overturning moment is increased as compared with the case where it is provided in the center portion, and it becomes safe against the overturning moment due to wind load or seismic force.

  According to a third aspect of the present invention, in the basic frame structure of the self-standing antenna according to any one of the first and second aspects, the base end portion of each basic beam sandwiches the support column of the self-supporting antenna. A base frame structure of a self-supporting antenna, characterized in that the base ends of adjacent base beams are joined together and are joined by a splice plate and a bolt.

  For example, as shown in FIG. 2, a splice plate is disposed so as to surround a column support at the center of the frame, and is attached to the upper surface of the parallel flange of the base beam with a bolt. It can be manufactured only by cutting and drilling steel frames with a minimum number of welds, and it is easy to assemble.

  In the invention according to claim 4 of the present invention, the plate-like foundation on which the support of the self-supporting antenna is erected in the center is horizontally installed on the roof surface via the cushioning material support, and the outer periphery on the plate-like upper surface A base frame structure of a self-supporting antenna, wherein a counterweight is provided at a portion, and the weight of the counterweight is increased or decreased according to wind load or seismic force.

  This is a case where a plate-like foundation is used instead of the radial foundation beam, and a foundation plate having a square shape such as a square or a hexagon is horizontally installed. The counterweights are installed at a plurality of locations at intervals in the circumferential direction on the upper surface of the outer peripheral portion of the foundation plate. A plurality of cushioning material supports are also arranged at intervals in the circumferential direction on the lower surface of the outer peripheral portion of the foundation plate.

Since the present invention is configured as described above, the following effects can be obtained.
(1) Since the foundation frame is composed of a radial arrangement of a plurality of foundation beams, it occupies less space for installing a self-supporting antenna and can be installed on the roof of an existing building without any problems.
(2) In particular, in the case of a tripod-shaped foundation frame, since the tip of the foundation beam is supported at three points, there is no backlash due to unevenness of the roof surface, and a stable installation state can be obtained.
(3) Since the number of members is small, the flow of force is simple, the design is easy, the cost can be reduced, and transportation and assembly to the roof becomes easy.
(4) Lightweight and supported by support of cushioning material such as rubber, so it can be installed without damaging the roof of the building.
(5) Since it is supported by a rubber cushioning material support at the tip of each foundation beam, it does not fall easily, and the rubber cushioning material support does not cause a slip even during an earthquake.

(6) Since a counterweight is provided at the tip of each foundation beam and the weight of the counterweight is increased or decreased according to wind load or seismic force, it can be handled without changing the size and shape of the foundation frame. Can be used with a certain size and shape, so that the cost can be reduced by mass production.
(7) By providing a counterweight at the tip of each foundation beam, the resistance overturning moment increases compared to the case where it is provided in the center, making it safer against overturning moments caused by wind loads or seismic forces.
(8) The base ends of each foundation beam are gathered and arranged so as to sandwich the column of the self-supporting antenna, and the base ends of adjacent foundation beams are joined together with splice plates and bolts to minimize the number of welds. Therefore, it can be manufactured only by cutting and drilling steel frames, and it is easy to assemble, and the cost can be reduced.
(9) Even if a plate-shaped foundation is used instead of the radial foundation beam, the same effect as described above can be obtained.

  Hereinafter, the present invention will be described based on an embodiment shown in the drawings. FIG. 1 is an elevation view and a plan view showing an example of a self-supporting antenna according to the present invention and a basic embodiment of its basic frame structure. FIG. 2 is a plan view and an elevation view showing a specific structural example of the base frame portion.

  In the embodiment of FIG. 1, the self-supporting antenna 1 includes a basic frame 2, a support column 3, an antenna arm 4, and an antenna 5. The support 3, the antenna arm 4, and the antenna 5 are the same as in the prior art. The support 3 is erected upward from the center of the base frame 2, and the antenna arm 4 is located outside the support 3 at the top of the support 3. The antenna 5 protrudes vertically upward from the tip of each antenna arm 4. Although the illustrated example has eight types, there are other four types.

  In such a configuration, in the present invention, the foundation frame 2 is constituted by the foundation beam 10 made of three H-shaped steels or the like radially arranged from the position of the support column 3 at the center of the frame, To do. The three basic beams 10 have the same length and are arranged at equal intervals in the circumferential direction. Further, a cushioning material support 11 such as a plate-like rubber bearing is provided on the lower surface of the tip of the three basic beams 10, and is installed on the roof surface via the three cushioning material supports 11, so that the self-supporting antenna 1 is provided. It is supported at three points on the outer periphery of the base frame 2. The length L of the basic frame 2 is, for example, about 1.5 m. Moreover, you may make it provide the hole for weight reduction in the web etc. of the basic beam 10. FIG.

  In the case of such a tripod-shaped foundation frame 2, since the tip of the foundation beam 10 is supported at three points, there is no backlash due to unevenness of the roof surface, and a stable installation state can be obtained. In addition, since the three basic beams 10 are arranged radially, the occupied area for installing the self-standing antenna is small, and it can be installed on the roof of an existing building without any trouble. Further, since the number of members is small, the flow of force is simple, the design is easy, the cost can be reduced, and transportation and assembly to the roof are easy. Furthermore, since it is lightweight and is supported at three points by the cushioning material support 11 such as rubber, it can be installed without damaging the roof surface of the building. Moreover, since it supports by the buffer material support 11 of rubber | gum etc. at the front-end | tip of each foundation beam 10, it does not fall easily by the buffer material support 11 of rubber | gum etc., and does not cause a slip at the time of an earthquake.

  In addition, one of the purposes of the antenna foundation is to prevent the antenna from overturning and slipping due to the assumed wind load and seismic force, but the wind load and seismic force vary greatly depending on the area and height where the antenna is installed. Conventionally, the size and shape of the foundation frame are changed in accordance with the fluctuation of the wind load and the seismic force. However, in the present invention, as shown in FIG. By providing and increasing / decreasing the weight of the counterweight 12 according to wind load or seismic force, it is possible to cope with the change without changing the size or shape of the base frame 2. The base frame 2 can be of a certain size and shape, and the cost can be reduced by mass production.

  As the counterweight 12, for example, as shown in FIG. 2, a plate-like weight is used, and the weight is adjusted by increasing or decreasing the number. When the foundation beam 10 is H-shaped steel, plate-like counterweights 12 are attached to both sides of the web, bolts 13 penetrating the web are inserted into the insertion holes of the plate-like counterweight 12, and tightened with nuts. Attach it detachably. By providing the counterweight 12 at the tip of each foundation beam 10, the resistance overturning moment is increased as compared with the case where the counterweight 12 is provided in the central portion, and it becomes safe against the overturning moment due to wind load or seismic force. Note that the upper portion of the column 3 and the tip of each basic beam 2 may be connected by a tie bar 14.

  Wind load is divided into regional categories (for example, central Tokyo, Chiba prefecture, Okinawa prefecture, etc., in which the standard wind speed increases in this order), ground surface roughness classification (I: extremely flat area, II: within 500m from coast, III: I Other than, II, IV, IV: urbanization area, wind pressure decreases in this order), and installation height (the higher the wind pressure, the higher the wind pressure). Calculate the antenna overturning moment due to these wind loads or the antenna overturning moment due to the set seismic force, increase or decrease the number of counterweights, and obtain a resistance overturning moment (for example, a safety factor of 1.5 times or more) that exceeds the overturning moment Like that. If the wind load is greater than the seismic force, the seismic force may be greater than the wind load.

  In addition, by using rubber for the shock absorber support 11, it can be prevented from slipping against wind loads, but in order to prevent slipping even during an earthquake, for example, the shock absorber support 11 and the roof surface. It is also conceivable to place an adhesive between them.

  As shown in FIG. 1, the base frame 2 can be configured such that the base ends of the three base beams 10 are assembled at the center of the frame and joined together by welding, and the support column 3 is installed thereon. When an H-shaped steel is used for the basic beam 10, a joining structure as shown in FIG.

  In the joining structure of FIG. 2, the base ends of the three basic beams 10 are arranged together so as to sandwich the support column 3, and one side flanges at the base ends of the adjacent basic beams 10 are the splice plate 20 and the high strength bolt. 21 is joined. The splice plate 20 is a joint plate having a U-shaped planar shape, and is attached on one adjacent flange and fastened to the flange by a high-strength bolt 21. They are joined at the center by three splice plates 20 arranged above and below the base frame 2, respectively. The column 3 passes through the center of the foundation frame 2 and is attached to the web of the foundation beam 2 via a gusset plate 22.

  With such a joining structure, it is possible to manufacture by only cutting and punching a steel frame with a minimum number of welds, and it is easy to assemble.

  In addition, although the above demonstrated the base frame of a tripod shape, it is not limited to this. For example, the quadruple shape shown in FIGS. This tetrapod has basically the same structure as the tripod in FIG. 2 except that the number of basic beams 10 is different. The center of the foundation frame 2 is a central joint 30, and the flanges at the base ends of the foundation beams 10 are joined to the upper and lower flange plates 31 having a hexagonal shape by a splice plate 20 and high-strength bolts 21. The web at the base end portion of each foundation beam 10 is joined to the web plate 32 arranged in a cross shape in plan view by the splice plate 20 and the high-strength bolt 21. The lower part of the support column 3 is inserted into the mounting cylinder 33 arranged in the center and fixed with bolts 34. The intermediate portions of the adjacent basic beams 10 may be connected by an oblique connecting member 35 such as an angle member for reinforcement.

  Moreover, although the case where the radial fundamental beam was used was illustrated above, not only this but a plate-shaped foundation may be used. A base plate having a square shape such as a square or a hexagon is installed horizontally, and a plurality of counterweights are installed on the outer peripheral upper surface at intervals in the circumferential direction. A plurality of cushioning material supports are also arranged on the outer peripheral lower surface of the foundation plate at intervals in the circumferential direction.

It is a basic embodiment of an example of the self-standing antenna according to the present invention and its basic frame structure, (a) is an elevation view, and (b) is a plan view. It is a specific structural example of the basic frame part of this invention, (a) is a top view, (b) is an elevation view. It is other embodiment of the basic frame structure which concerns on this invention, (a) is a top view, (b) is an elevation view. FIG. 4 is a horizontal sectional view of the basic frame structure of FIG. 3. The center member of the basic frame structure of FIG. 3 is shown, (a) is a top view, (b) is an elevation view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Self-supporting antenna 2 ... Base frame 3 ... Support | pillar 4 ... Antenna arm 5 ... Antenna 10 ... Base beam 11 ... Buffer material support (rubber support)
12 ... Counter weight 13 ... Bolt 14 ... Tie bar 20 ... Splice plate 21 ... High strength bolt 22 ... Gusset plate 30 ... Center joint 31 ... Flange plate 32 ... Web plate 33 ... Mounting cylinder 34 ... Bolt 35 ... Connecting material

Claims (4)

It is a basic frame structure of a self-standing antenna installed on the rooftop,
A plurality of foundation beams are arranged radially from the center of the foundation frame to the outside, and are installed on the roof surface via cushioning material supports provided on the lower surface of the tip of each foundation beam. The basic frame structure of a self-supporting antenna.   2. The base frame structure of the self-standing antenna according to claim 1, wherein a counterweight is provided at a tip of each base beam, and the weight of the counterweight is increased or decreased according to wind load or seismic force. The basic frame structure of a self-supporting antenna.   3. A base frame structure for a self-supporting antenna according to claim 1, wherein the base ends of the base beams are arranged so as to sandwich the support pillar of the self-supporting antenna, and the base ends of adjacent base beams are arranged. A basic frame structure of a self-supporting antenna, characterized in that the parts are joined by a splice plate and a bolt. It is a basic frame structure of a self-standing antenna installed on the rooftop,
A plate-like foundation on which the support of the self-standing antenna is erected in the center is installed horizontally on the roof surface via a cushion support, and a counterweight is provided on the outer periphery of the plate-like upper surface to provide wind load or A base frame structure of a self-supporting antenna, wherein the weight of the counterweight is increased or decreased according to seismic force.

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