JPH08265021A - Installation method for parabolic antenna - Google Patents

Abstract

PURPOSE: To realize the installation method of a parabolic antenna with a simple structure holding the parabolic antenna within a communication enabling range at all times independently of the degree of vibration of a building. CONSTITUTION: A base end of a pendulum member 3 is pivotally supported to a side face of a building with a tilt of an angle downward and a parabolic antenna 2 is provided to the tip. A controller 7 releases the engagement between the pendulum member 3 and a stopper member 5 restricting the motion of the pendulum member 3 only when a displacement meter 6 measuring the displacement of the building 9 detects a displacement larger than a prescribed value. A period of the parabolic antenna 2 is increased more than a period of the building 9 on the occurrence of an earthquake or a typhoon by selecting properly the length of the pendulum member 3. Thus, the parabolic antenna 2 is kept almost in a standstill state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of installing a parabolic antenna for transmitting radio waves, which is attached to a relatively tall and elongated building such as a tower or a radio tower, and particularly to a building when an earthquake or typhoon occurs. The present invention relates to a method of installing a parabolic antenna that can transmit even when the ground shakes greatly.

[0002]

2. Description of the Related Art Conventionally, a communication antenna mounted on a building such as a tower or a radio tower is usually fixed directly to such a building. Since the building is generally high-rise and long and slender, it greatly swings in the event of an earthquake or typhoon. There is no particular problem when the communication antenna is an omnidirectional antenna, but when the communication antenna is a directional antenna such as a parabolic antenna which is often used recently, the communicable range is as shown in the image diagram of FIG. However, if the parabolic antenna 2 swings beyond this range as indicated by the dotted line, there is a problem that radio waves cannot be transmitted. In particular, the sway due to the wind may continue for a span of 1 to 2 days in the case of a typhoon or a seasonal wind, and has an extremely large influence when communication from the parabolic antenna becomes impossible. For this reason,
An antenna mounting device having a vibration-proof structure disclosed in Japanese Patent Laid-Open No. 88403 and a vibration reducing unit disclosed in Japanese Patent Laid-Open No. 3-125983 are used.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the case of the "antenna mounting device" disclosed in Japanese Patent Publication, the antenna has a laminated structure of pillar members arranged orthogonally to each other, and the pillar members absorb the vibration of the structure and suppress the oscillation of the antenna. The antenna pointing error is prevented. However, in the case of this "antenna mounting device", the effect may be halved depending on the swinging direction of the building, and the structure is rather complicated. Further, since no stopper member or the like is attached, it always operates, and there is a problem in durability. Further, in the case of this "antenna mounting device", there is a problem that it is structurally installed on the uppermost surface of the structure and cannot be easily installed on the side surface. On the other hand, the "radar device" disclosed in Japanese Patent Laid-Open No. 3-125983 detects the vibration speed of an antenna and applies a braking force in the opposite direction proportional to this vibration speed to the antenna, which makes the device structure complicated. There is a problem that the cost becomes high.

The present invention solves the above problems and has a simple structure and can be easily installed in a building.
It is an object of the present invention to provide a method of installing a parabolic antenna that does not require the installation position of the antenna to be too low and can always stably hold the antenna in the communicable range.

[0005]

In order to achieve the above object, the present invention has a base end portion pivotally supported on a side surface of a building and a parabolic antenna fixed to a tip end thereof, so that the parabolic antenna is fixed when the building is rocked. A pendulum member that swings with a cycle larger than the cycle is attached while being inclined downward by an angle θ, and a stopper member and the pendulum that restrain the swing of the pendulum member according to the displacement amount of a building by a displacement meter. It is characterized by a method of installing a parabolic antenna in which engagement with a member is adjusted by a control device. More specifically, the control device releases the engagement between the stopper member and the pendulum member when the displacement of the building exceeds the receivable range by the parabolic antenna, and the stopper member is , And reciprocates by magnetic force or hydraulic pressure, and at least the pendulum member and the parabolic antenna are shielded from the atmosphere side by a windproof cover.

[0006]

[Operation] Since the parabolic antenna is attached to the tip of the pendulum member that is inclined downward by the angle θ, the synchronization must be lengthened by 1 / (sin θ) ^1/2 times compared to a grating that is not inclined with the same member length. Can be done. In other words, when the synchronization is the same, the length of the tilted grating member can be reduced and the parabola antenna can be installed at a high position in the building. When the displacement of the building is small, the swing of the pendulum member is restricted by the stopper member, and the parabolic antenna moves together with the building. When the shake of the building becomes large enough to exceed the communication range of the parabola antenna, the engagement between the stopper member and the pendulum member is released, and the parabola antenna oscillates in a predetermined cycle. However, since the period of the parabolic antenna is longer than the period of the building, the parabolic antenna is kept almost stationary. As described above, the parabolic antenna is always kept within the communicable range.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the overall structure of this embodiment, FIG. 2 is an enlarged partial sectional view for explaining the structure of a tilt type mounting device for a parabolic antenna, FIG. 3 is a top view of FIG. 1, and FIG. FIG. 5 is a partial cross-sectional view showing an embodiment of the stopper member of this embodiment.
FIG. 6 is an explanatory perspective view for explaining the pendulum theory of the present embodiment.

As shown in FIG. 1, the tilt-type mounting device 1 for a parabolic antenna of this embodiment is roughly classified into a pendulum member 3 for fixing the parabolic antenna 2 to the tip side and a base end portion of the pendulum member 3. Displacement of the pedestal 4, which is cantilevered on the side of the supporting structure 9, a stopper member 5 which is detachably engaged with the base end side of the pendulum member 3 and restrains its swinging, and the structure 9. It is composed of a displacement meter 6 for detecting the amount, a control device 7 and the like which are connected to the stopper member 5 and the displacement meter 6 and control them. The parabolic antenna inclined mounting device 1 is covered with a windproof cover 8.

As shown in FIG. 1, FIG. 2 and FIG. 3, the pendulum member 3 is made of an elongated bar member, and is arranged so as to be inclined downward with respect to the building 9 by an angle θ. The angle θ is, for example, 1
It has an acute angle of about 0 [°]. A rotary shaft 10 is inserted at a base end side of the pendulum member 3 so as to be orthogonal to the angle θ and pivotally supports the pendulum member 3. The parabolic antenna 2 is fixed to the tip side of the pendulum member 3.

The pedestal 4 is a block-shaped member whose base end is fixed to the building 9 and cantilevered.
A guide surface 1 inclined downward at an angle θ on the upper surface as shown in
1 is formed. Further, the rotary shaft 10 is fixed.

The stopper member 5 has a structure that is detachably engaged with the pendulum member 3, and for example, the structure shown in FIGS. 3 and 4 is adopted. That is, it is composed of a solenoid valve 12 housed in the pedestal 4, a plunger 13 of a magnetic body that abuts and engages with the pendulum member 3, a spring 14, and the like. The spring 14 biases the plunger 13 in the protruding direction. A holding member 15 is fitted to the cradle 4 side in order to prevent the plunger 13 from jumping out of the cradle 4. When the solenoid valve 12 is activated by energization, the plunger 13 is attracted to the solenoid valve 12 side by magnetic force or hydraulic pressure, and the plunger 13 is retracted from the surface of the guide surface 11. As a result, the abutting engagement between the plunger 13 and the pendulum member 3 is released.

As shown in FIG. 1, a displacement gauge 6 is mounted on a building 9 to measure the displacement of the building 9 when an earthquake or a typhoon occurs, and is connected to a controller 7.

The control device 7 is connected to the displacement gauge 6 and the solenoid valve 12 of the stopper member 5 and controls them. That is, the control device 7 holds the solenoid valve 12 in the OFF state when the building 9 is in the normal swinging state. On the other hand, when the displacement amount of the building portion 9 detected by the displacement meter 6 becomes large enough to move the parabolic antenna 2 to the incommunicable range, the control device 7 causes the displacement meter 6 to move.
The solenoid valve 12 is controlled to the ON state based on the detection signal from the. As a result, the plunger 13 of the stopper member 5 is attracted to the solenoid valve 12 side against the spring force of the spring 14.

The windbreak cover 8 is formed of a box frame as shown in FIG. 1, and is of a shape that covers the inclined mounting device 1 of the parabolic antenna. The base end side is fixed to the building 9 side and cantilevered.

Next, the operation of this embodiment will be described. When the displacement amount detected by the displacement meter 6 due to the swing of the building 9 is within a predetermined range, that is, the displacement amount range corresponding to the communicable range of the parabolic antenna 2, as shown in FIGS. The plunger 13 of the stopper member 5 has a guide surface 11
Exposed from. The spring 14 holds the plunger 13 in the above state. For this reason, the pendulum member 3 contacts the plunger 13 of the stopper member 5, and the free swing of the pendulum member 3 is restricted. Therefore, the parabolic antenna 2 moves together with the building 9. On the other hand, when the building 9 swings greatly due to the occurrence of an earthquake or a typhoon, and the displacement amount detected by the displacement meter 6 exceeds the above range, the control device 7 causes the stopper member 5 to move.
The solenoid valve 12 is operated to turn it on. Therefore, the plunger 13 is attracted to the solenoid valve 12 side, and the plunger 13 retracts from the guide surface 11. Therefore, the pendulum member 3 is in a free state. FIG. 5 shows the pendulum operation of the pendulum member 3 in this state. Since the pendulum member 3 is tilted downward by the angle θ as described above, the period T of the parabolic antenna 2 and the length 1 of the pendulum member 3 in that case are given by the following equation (2). l = (T / 2π) ² · g · sin θ (2)

For example, a period of about 3 seconds is specified as the swing of the building 9 when an earthquake or a typhoon occurs. On the other hand, if the period of the parabolic antenna 2 is set to 5 seconds, l according to the above equation (2) can be obtained. In this embodiment, the angle θ is 10
[°]. That is, l = (5 / 2π) ² · 9.8
-Sin10 = 1.08 [m]. In the above-mentioned prior art, under the same condition, l = 6.2 [m], which is about 6 times as long as the present embodiment.
The problem that the installation position of the device is mounted at a particularly low position is solved.

In the above description, particularly the stopper member 5
The structure of is not limited to that described above, and a known technique is used. Further, the windbreak cover 8 does not necessarily have to be attached depending on the structure of the building 9.

[0018]

According to the present invention, the following remarkable effects are obtained. 1) The pendulum member is tilted downward by an angle of θ, and a parabolic antenna is fixed to the tip of the pendulum member. By determining the height l, the parabolic antenna can be always held in the communicable range regardless of the swing of the building. As a result, transmission failure does not occur. 2) By adopting a structure in which the parabolic antenna is fixed to the pendulum member that is arranged so as to be inclined, the parabolic antenna can be installed at a high position in the building. Therefore, the disadvantageous condition in communication is eliminated. 3) The tilt type mounting device of the parabolic antenna of the present invention is of a simple pendulum type, has a simple structure and can be implemented at low cost. 4) Since the pendulum member is firmly held by the stopper member when the structure shakes little, and the pendulum member swings only when the displacement amount is large, the durability of the device can be improved. 5) By providing the windproof cover, the safety of the device and unnecessary rocking can be prevented, and the life can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing the overall structure of an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view showing a detailed structure around a parabolic antenna and a pendulum member according to the present embodiment.

FIG. 3 is a top view of FIG.

FIG. 4 is a partial cross-sectional view showing an embodiment of the stopper member of the present embodiment.

FIG. 5 is an explanatory perspective view for explaining the pendulum theory of the present embodiment.

FIG. 6 is an image diagram for explaining a communicable range.

[Explanation of symbols]

 1 Inclined mounting device for parabolic antenna 2 Parabolic antenna 3 Pendulum member 4 Cradle 5 Stopper member 6 Displacement meter 7 Control device 8 Windbreak cover 9 Building 10 Rotating shaft 11 Guide surface 12 Solenoid valve 13 Plunger 14 Spring 15 Holding member

Claims (4)

[Claims] 1. A pendulum member which pivotally supports its base end portion on a side surface of a building and has a parabolic antenna fixed to the tip end thereof and which swings at a cycle larger than a cycle when the building swings downward by an angle θ. A parabola that is mounted at an angle and adjusts the engagement between a stopper member that restrains the swing of the pendulum member and the pendulum member in accordance with the amount of displacement of a building by a displacement meter by a control device. How to install the antenna. 2. The parabola according to claim 1, wherein the control device releases the engagement between the stopper member and the pendulum member when the displacement of the building exceeds a receivable range of the parabolic antenna. How to install the antenna. 3. The parabolic antenna installation method according to claim 1, wherein the stopper member reciprocates by magnetic force or hydraulic pressure. 4. The parabolic antenna installation method according to claim 1, wherein at least the pendulum member and the parabolic antenna are shielded from the atmosphere side by a windproof cover.