JPH0583053U - Manhole cover - Google Patents

Abstract

(57) [Summary] [Purpose] By providing an antenna inside the manhole cover, it is possible to enable wireless communication with the outside even inside the manhole. [Structure] A cylindrical flame 1, an antenna element housing portion 2 which is attached to an upper portion of the frame, an upper portion of which is a dielectric film having an antenna element, and a lower portion which is a pad portion made of a water-absorptive material, and an antenna element housing portion 3 A manhole cover provided with a hollow cylindrical power supply fitting 3 which is mounted substantially at the center of the manhole cover.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a manhole cover for enabling communication between a wireless device on the road and a wireless device inside the manhole via a manhole cover exposed on the road surface.

[0002]

[Prior Art]

 Since the conventional manhole cover was made to cover the opening, there was no material provided with an antenna function in terms of material and structure. Also, although there are flat-shaped objects in conventional antennas, they are not intended to assume the installation location on the road surface or also serve as a manhole cover, but the material and structure of the existing antenna are used. Not applicable to manhole covers.

[0003]

[Problems to be solved by the device]

 The present invention was proposed to remedy the above-mentioned drawbacks, and its purpose is to enable communication between a radio on the ground and a radio installed in a manhole via a manhole cover. In order to achieve this, the manhole also serves as an antenna, which fulfills the original strength and structural functions of the lid, but is also equipped with an antenna function such as radiation and focusing of electromagnetic waves to reduce the deterioration of the antenna function due to external conditions such as flooding and snow. To provide a lid for.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention is an antenna element including a cylindrical frame, a dielectric film mounted on the upper portion of the frame, the upper portion of which is a dielectric film having an antenna element inside, and the lower portion of which is a pad portion made of a water absorbing expansion material. The gist of the invention is a manhole cover characterized by comprising a housing portion and a hollow cylindrical power supply fitting that is mounted substantially at the center of the antenna element housing portion.

[0005]

[Action]

 Since the antenna is provided inside the manhole cover in the present invention, it is easy to wirelessly communicate with the outside even inside the manhole, and the work efficiency can be improved.

[0006]

【Example】

 Next, an embodiment of the present invention will be described. FIG. 1 shows a perspective view of a manhole cover of the present invention. In the figure, 1 is a lid main body, 2 is an antenna element housing portion, and 3 is a power supply fitting. FIG. 2 is a perspective view of the lid main body (frame), in which a hole 4 for mounting a power feeding metal fitting, a receiving metal fitting 5 for mounting the antenna element housing 2 and other small holes are provided in the center. .. This material is made of cast iron and is designed to cover the opening of a manhole and have sufficient strength as a manhole cover by itself. FIG. 3 is a perspective view of the housing of the antenna element. The upper part has a structure in which the antenna element 7 is sandwiched and fixed between a pair of dielectric film 6 having appropriate thickness and strength. Adhere to the pad 8. Numeral 8 is a pad made of a material having a high water-absorptive property, which is designed to come into close contact with the inside of the lid main body 1. Since it has sufficient hardness when dried, it may depend on the load of a pedestrian or a light vehicle. It does not easily deform. FIG. 4 shows a power supply fitting, which is a main body of a power supply fitting made of a hollow cylinder (closed at the upper end and opening of the bottom plate), to which four holding arms 9 made of flat steel are integrated. The figure (b) shows the state of connection with the antenna element.

Since this structure is such a structure, it has a function as a lid for covering the opening of the manhole and also has an antenna function. Moreover, since the pad 8 is made of a material that has a large expansion coefficient when absorbing water, even if the area around the lid is flooded due to rainfall, the antenna part is lifted above the water surface to prevent the emission and reception of electromagnetic waves. Function can be maintained. In this case, a vehicle tire or the like may step on the antenna accommodating portion 2, but at this time, since the pad 8 has increased flexibility due to water absorption expansion, the tire or the like may be given an excessive impact or the antenna may be damaged. The storage compartment will not be damaged. Since the flooding level is not uniform depending on the location of the manhole and the degree of rainfall, a pad of 3 to 4 types with different pad thicknesses for each 1 cm is selected according to the assumed flooding level. As for measures against snowfall, no special measures have been taken in this example, but the required antenna function can be maintained except when covered with high-density ice snow in a frozen state, and snow ice due to traffic maintenance facilities such as snow melting facilities. Since it can be expected to melt, it can be applied to cold regions even in this embodiment.

FIG. 5 is a diagram for explaining a usage example when the product of the present invention is attached to a manhole. In the figure, 10 is a distributor, 11 is a power supply line, 12 is a wireless device, and 13 is a communication line. A power line, 14 is a power line, 15 is a communication cable, and 16 is a manhole cover receiving object. The feeder line (feeder) 11 connected to the antenna element that is sealed inside the antenna element housing enters the inside through the hole made in the cylindrical part of the power supply fitting 3 and is connected to the distributor 12 in the manhole. It The feeder line, which is collected by the distributor into a pair of terminals, is connected to the antenna terminal A of the wireless device 12 installed in the manhole. This usage example is for a communication cable manhole.Therefore, for the power supply to the radio and the supply of communication signals, etc., select the core wire in the communication cable that is preset for each application, By connecting the power supply terminal A and the communication input / output terminal B of the wireless device, the wireless device can be operated easily.

6 to 8 are views for explaining the characteristic features of the present invention by comparing with a conventional technique. In FIG. 6, (a) is a conventional manhole, and (b) is a conventional manhole. In the case of a conventional manhole cover, the electromagnetic energy EA from the space is the ground fault current I if the cover material is a conductor such as cast iron, and the material is an insulator such as concrete. For example, because it is attenuated before reaching the predetermined terminal T due to its shielding effect, it cannot be taken out by a normal wireless device, and when electromagnetic energy EB is supplied from T, the electromagnetic energy EB is directed from the surface of the lid to the space for the same reason. The electromagnetic energy of can not be radiated. The present invention is dependent on the material of the lid body 1 by using the dielectric (insulating) coating 6 and the feeding metal fitting 3 for electrically isolating the lid body 1 from the antenna element 7 and the feeder. It is possible to collect and radiate EA and EB without having to do so. Fig. 7 shows the features of the construction method when constructing an information / communication network. When the antenna Y is set on the road surface with some protective measures, it is necessary to install a radio R near the antenna. However, in the conventional method shown in (a), a great deal of labor is required for wiring between the antenna Y and the wireless device B and for connecting the radio device R and the information / communication network N. In the invention, the antenna Y, the radio device R, and the network N can be connected in the immediate vicinity. FIG. 8 shows the repeated use of the same frequency radio wave and the improvement of the radio wave utilization efficiency according to the present invention. FIG. 8 (a) shows the radio wave reachable range. The higher the antenna, the wider the reachable range. As shown in Fig. (B), in the conventional installation on an elevated pole, the use of the radio wave within a certain area is limited to one person. The figure (c) shows the case of the present invention, where the range of radio waves is narrowed by installing the antenna on the road surface, and the same radio wave can be used by multiple people within a certain area.

[0010]

[Effect of the device]

 As described above, the present invention has the above advantages because it makes it possible to easily use a manhole installed on a road with a large amount of traffic as a base station for receiving and transmitting radio waves. A wireless communication path can be set up between the radios carried by vehicles or pedestrians on the road and the communication cable housed in the manhole, so the connection point of the communication cable must be the required telephone exchange or computer. Various mobile communication services (services such as telephone exchanges for vehicles and pedestrians, information provision, information collection, information processing and processing) can be easily realized by guiding them to devices. Since the installation location of the antenna is almost the same as the ground surface, the diffusion range of electromagnetic waves can be set to the minimum, so electromagnetic waves of the same frequency can be used repeatedly even in a narrow range, and advanced and effective use of radio resources To help. By installing a gas concentration detector or a water level detector in combination with a wireless device inside the manhole, the condition inside the manhole can be detected by a wireless device on the road without opening the lid. By installing a radio that constantly sends each location information in the manhole, it is possible to easily implement a location guidance service for receivers on the road. Wiring to the fixed terminal device is omitted when connecting the display device fixed around the manhole and the collection device of weather condition (fixed terminal installation) and the center device for issuing or centrally processing the information. As a result, it is possible to avoid obstruction of traffic due to wiring work. And so on.

[Brief description of drawings]

FIG. 1 is a perspective view of a manhole cover of the present invention.

FIG. 2 shows a perspective view of a lid body.

3A and 3B show an antenna element housing portion, FIG. 3A is a perspective view, and FIG. 3B is a partial exploded perspective view.

4A and 4B show a power supply fitting, in which FIG. 4A is an overall perspective view and FIG. 4B is a partial exploded perspective view.

FIG. 5 shows the usage of the manhole cover of the present invention.

6A and 6B show the features of the present invention. FIG. 6A shows a conventional example, and FIG. 6B shows a usage situation in the case of the present invention.

7A and 7B show the features of the present invention. FIG. 7A shows a conventional example, and FIG. 7B shows a usage situation in the case of the present invention.

8A and 8B show features of the present invention. FIG. 8A shows a radio wave reachable range, FIG. 8B shows a conventional example, and FIG.

[Explanation of symbols]

 1 Lid Main Body 2 Antenna Element Storage Section 3 Power Supply Metal Fitting 4 Hole 5 Receiving Metal Fitting 6 Dielectric Film 7 Antenna Element 8 Pad 9 Arm 10 Distributor 11 Power Supply Line 12 Radio 13 Communication Line 14 Telephone Line 15 Communication Cable 16 Manhole Cover Reception hardware

Claims (1)

[Scope of utility model registration request] 1. A cylindrical flame, an antenna element accommodating portion which is attached to an upper portion of the flame, an upper portion of which is a dielectric film having an antenna element therein, and a lower portion which is a pad portion made of a water-absorption material, and the antenna. A manhole cover, comprising: a hollow cylindrical power supply fitting that is mounted substantially at the center of an element housing portion.