JPH0441431Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to an electric field type intrusion detector, and particularly relates to a technique for providing an electric field type intrusion detector with excellent environmental resistance.

(Prior art and its problems) Conventionally, as an intrusion detector for detecting the approach of a foreign object to a target protected area, an intrusion detector is installed to surround at least a part of the protected area and detects a predetermined electric field. an electric field line that generates an electric field line; and a sensing line that is disposed along the electric field line and substantially parallel to the electric field line and detects the intensity of the electric field generated in the electric field line,
A so-called electric field type intrusion detector is known that detects the approach of a foreign object to a protected area based on fluctuations in the electric field strength detected by the sensing line (US Pat. No. 4,174,518). (see book).

By the way, in such an electric field type intrusion detector,
Generally, flexible insulated cables in which conductors are coated with a predetermined insulator are used as the electric field lines and sensing lines, but in conventional electric field intrusion detectors, these electric field lines and sensing lines are Flexible insulated cables were directly held and installed between designated holding members while being exposed, making detection difficult due to natural environmental conditions or changes such as salt damage, snow accumulation, wind and rain. There were problems that could easily lead to a decline in functionality and the occurrence of false alarms.

In other words, in such an electric field type intrusion detector,
Due to the detection principle, it is necessary to keep the electric field strength detected by the sensing wire as stable as possible when no foreign object is approaching, so it is necessary to keep the relative positional relationship between the electric field line and the sensing wire as constant as possible. . Furthermore, in order to prevent high-frequency currents in the electric field lines and sensing lines from being grounded or short-circuited, it is necessary to insulate the electric field lines and sensing lines well from each other and from the ground.

Therefore, conventional electric field type intrusion detectors usually
As shown in FIGS. 7 and 8, a heart course 6 is attached to both ends of each insulated cable 2, 4 as an electric field line and a sensing line, and the heart course 6 is Predetermined holding members (metal struts 18, end support rods 16) are connected via wire tensioning devices consisting of insulators 8, springs 10, turnbuckles 12, etc.
The electric field lines 2 and the sensing lines 4 are thereby arranged.

Insulated cable 2 as electric field line and sensing line,
4 is stretched between the holding members with a predetermined tension based on the biasing force of the spring 10, thereby holding the electric field line and the sensing line in a constant positional relationship as much as possible. This is what we are learning to do. Furthermore, by holding the insulated cables 2 and 4 through the insulator 12, high frequency currents in the electric field lines and sensing lines are prevented from being grounded or short-circuited.

In addition, FIG. 7 shows the electric field line 2 and the sensing line 4 with respect to the metal fence consisting of the metal pole 14 and the wire mesh 20.
Figure 8 shows an example in which electric field lines and sensing lines are placed in a reinforced concrete wall.
are shown respectively. Further, in those figures, 22 is an intermediate part support rod, which supports the intermediate part of the insulated cables 2 and 4, and prevents the insulated cables 2 and 4 from loosening due to their own weight. It plays the role of defining vibration nodes of the cables 2 and 4 and suppressing their positional fluctuations.

However, in such a conventional electric field type intrusion detector, the insulated cables 2 and 4 as the electric field line and the sensing line are flexible and bendable as described above. The insulated cables 2 and 4 are stretched with a predetermined tension, and the middle part is connected to the middle part support rod 2.
Even if they were supported by 2, it was unavoidable that their relative positions would change relatively significantly due to changes in the natural environment such as wind, rain, snowfall, etc., and this could lead to false alarms. It was inevitable that this would occur more easily.

In addition, in the conventional electric field type intrusion detector as described above, the insulation function against high frequency current of the electric field wire 2 and the sensing wire 4 is obtained exclusively by the insulator 8, so that it is difficult to prevent rain or salt from adhering to the intrusion detector. As a result, the insulation performance against high-frequency currents inevitably deteriorates as the insulation performance of the insulator 8 deteriorates, and there is a risk that the detection function of the detector will deteriorate significantly, especially under environmental conditions such as exposure to sea breeze. It contained within it.

(Solution) Against this background, the present invention aims to effectively prevent the deterioration of the detection function and the occurrence of false alarms due to the conditions and changes in the natural environment such as salt damage, snow accumulation, wind and rain, as described above. This was developed to provide an electric field type intrusion detector with excellent environmental resistance, and its gist is to provide an electric field type intrusion detector that can be used in a state that surrounds at least a part of the target protected area, as described above. an electric field line arranged to generate a predetermined electric field; and an electric field line arranged substantially parallel to the electric field line along the electric field line;
and a sensing line that detects the intensity of the electric field generated by the electric field line, and the approach of a foreign object to the protected area is detected based on fluctuations in the electric field intensity detected by the sensing line. In the electric field type intrusion detector, the electric field wire and the sensing wire are each hidden in an insulating pipe having a predetermined rigidity, or are embedded integrally in an insulating rod having a predetermined rigidity. , it was decided to arrange it.

In this case, it is desirable that the rigidity of the insulating pipes and rods be as high as possible, but under the conditions in which these pipes and rods are installed, it is important that the rigidity of the pipes and rods is such that they do not bend that much under normal snowfall, wind and rain, etc. It is sufficient that the height is .

(Operation, Effect) In this way, the electric field line and the sensing line are hidden in an insulating pipe having a predetermined rigidity, or are embedded integrally in an insulating rod having a predetermined rigidity. If you set
Deformation (bending) of electric field lines and sensing lines due to changes in the natural environment such as snow accumulation, wind and rain, etc. can be effectively suppressed. Therefore, it is possible to maintain a constant relative positional relationship between the electric field line and the sensing line, and to significantly reduce the occurrence of false alarms due to changes in the relative positional relationship between the electric field line and the sensing line. becomes possible.

Furthermore, when the electric field lines and sensing lines are arranged in the above-described manner, a tensile force is applied to both ends of the area where the electric field lines and sensing lines are arranged, as in the conventional electric field type intrusion detector. In addition, it is possible to maintain the relative positional relationship between the electric field wires and the sensing wires constant without applying tension, and it is possible to maintain the relative positional relationship between the electric field wires and the sensing wires at a constant level. Alternatively, it is possible to support the electric field lines and sensing lines by simply holding the rod stationary. As a result, it becomes possible to adopt other appropriate support methods for the electric field wires and sensing wires depending on the respective situation. In turn, it is possible to avoid deterioration of the detection function of the detector.

In other words, the electric field type intrusion detector according to the present invention can significantly reduce the occurrence of false alarms caused by changes in the natural environment. It is possible to effectively prevent the deterioration of the detection function of the detector due to conditions, and the reliability is significantly improved compared to conventional ones.

Moreover, according to the present invention, there is no need to provide wire tensioning equipment consisting of springs, insulators, etc., and the electric field wires and sensing wires can be hidden within insulating pipes or rods, compared to conventional methods. Another advantage is that the appearance can be made extremely simple.

The insulating pipe or rod in the present invention is desirably made of glass fiber reinforced plastic in terms of rigidity and durability, but may be made of other insulating materials.

(Examples) Hereinafter, in order to clarify the present invention more specifically, some examples thereof will be described in detail based on the drawings.

In the electric field type intrusion detector according to the present invention, the electric field generating device that supplies electric field generation power to the electric field wire, the detection device that detects the electric field strength detected by the sensing wire and generates an alarm, etc. are well known. Since it is not essential for understanding the present invention, only the arrangement form of the electric field line and the sensing line in the electric field type intrusion detector will be described in detail below.

First, Fig. 1 shows a partial appearance of an intrusion prevention fence in which the electric field wire and sensing wire of the electric field type intrusion detector according to the present invention are arranged, and Fig. 2 shows the assembly of the fence. An exploded view is shown to explain the structure.

In those figures, reference numeral 30 denotes fence posts made of glass fiber reinforced plastic that occupy almost the entire length of the fence, which are erected at a predetermined distance from each other so as to surround at least a part of the target protected area. It consists of a hollow pillar 32 and a hollow pillar 34, also made of glass fiber reinforced plastic, which is connected to the upper end of the pillar 32 in an inclined state at a predetermined angle. And here, the support 30 is located at the base end of the pillar 32.
It is erected while being planted on a concrete foundation block 36 buried in the ground.

In FIG. 2, 38 is a hollow joint made of glass fiber reinforced plastic, and the pillar 32 and pillar 34 are connected via this joint 38. Further, 40 is a pull-out pin fitted into the base end of the pedestal 32, and the pedestal 32 is inserted into the planting hole of the foundation block 36 at the base end where the pull-out pin 40 is fitted, and the mortar Fixed with filling material such as. Furthermore, 42 is a conical cap mounted on the Shinobashira 34, and like the Shinobashira 34 and the like, it is made of an insulating material such as glass fiber reinforced plastic.

The pillars 32 of the pillars 30 have 3
Two through holes 44 are formed, and cylindrical body joints 46 are inserted and fixed into these three through holes 44, respectively, with both ends protruding from the pillar 32 by a predetermined distance. . and each corresponding furring joint 46 of each of those adjacent struts 30.
A frame pipe 48 made of glass fiber reinforced plastic having sufficient rigidity is disposed with both ends in the axial direction fitted to the support columns 30, 30. A plurality of lattice rods 5 also made of glass fiber reinforced plastic are inserted vertically through the three furring pipes 48.
0 are fixed in parallel and spaced apart from each other by a certain distance.

In FIG. 2, reference numeral 52 denotes a through hole formed in the furring pipe 48 through which the lattice rod 50 is inserted.
Further, here, the furring joint 46 is also made of glass fiber reinforced plastic.

On the other hand, a stealth line 56 equipped with a stealth demon 54 is disposed on the stealth pillar 34 of the pillar 30 using a predetermined stopper (not shown), similar to the conventional intrusion prevention fence. In the example, such creeping wire 56 is also constructed of glass fiber reinforced plastic.

In this embodiment, as shown in FIG. 2, for such an intrusion prevention fence,
An electric field line 58 that generates a predetermined electric field is disposed in a state hidden and housed in a rim pipe 48 disposed between the vertical center portions of the pillars 32, and the rim Sensing lines 60, 60 for detecting the electric field generated by the electric field line 58 are disposed in a state hidden and housed in the circumferential pipes 48, 48 located above and below the pipe 48, respectively. As a result, the approach of a foreign object to the fence is detected based on the fluctuation in the electric field intensity detected by the sensing line 60. Note that here, as the electric field wire 58 and the sensing wire 60, generally a flexible insulated cable in which the conducting wire is coated with a predetermined insulator is used, but it is also possible to use the conducting wire as a bare wire. It is.

According to the electric field type intrusion sensor in which the electric field line 58 and the sensing lines 60, 60 are arranged in this way with respect to the intrusion prevention fence, as described above, the electric field line 58
Also, since each sensing wire 60 is hidden and housed in the highly rigid trunk pipe 48 made of insulating glass fiber reinforced plastic, it can be protected against natural environments such as snowfall, wind and rain. The relative positional relationship between the electric field lines 58 and the sensing lines 60, 60 hardly changes even with a change in the electric field line 58 and the sensing lines 60, 60, as in the conventional case. This means that false alarms rarely occur.

In addition, in this embodiment, the rim pipe 48 in which the electric field lines 58 and the sensing lines 60, 60 are disposed
However, as described above, it is supported by the struts 30 made of glass fiber reinforced plastic, which is an insulating material, and the lattice rods 50 disposed between the respective furring pipes 48 are also made of an insulating material. Constructed of glass fiber reinforced plastic, the electric field wires 58 and sensing wires 60, 60 are spaced a sufficient distance from each other and from the ground through an insulator, so that even rain Even if there is salt or
Sufficient insulation performance against the high frequency current of the electric field line 58 and the sensing lines 60, 60 is ensured,
Therefore, even if the detector is used under environmental conditions such as being exposed to sea breeze, the detection function of the detector is effectively prevented from being degraded due to this.

Moreover, in this embodiment, as mentioned above, most of the main components of the intrusion prevention fence are made of glass fiber reinforced plastic, which is an insulating material. It has the advantage that there is very little reflection, and therefore, when used at the periphery of an airport, it has the advantage that it can significantly reduce interference with airport operating equipment such as radar.

In addition, in this embodiment, the electric field line 58 and the sensing lines 60, 60 are connected to the outer edge pipe 4 of the intrusion prevention fence.
8, it has the advantage of significantly improving the aesthetics of the fence compared to conventional fences, and it also has the advantage that it is difficult to tell from the outside whether an intrusion detector is installed or not. be.

In this embodiment, the pillars 32, Shinobashira 34, body pipe 48, lattice rods 50, etc. of the support 30 are all made of glass fiber reinforced plastic, but the mechanical strength required for each is made of glass fiber reinforced plastic. It is also possible to construct them from other insulating materials, provided that they have the following properties. Further, the stealth wire 56, the stealth joint 38, the furring joint 46, etc. may be made of a conductive material such as metal, if necessary.

Furthermore, if sufficient mechanical strength cannot be obtained with the fence structure of this embodiment, a structure in which the pillars 30 are reinforced with retaining pillars 62 may be adopted as shown in FIG. In this case, like the pillars 32 and the like, the supporting pillars 62 are generally made of glass fiber reinforced plastic. In addition, in Fig. 3, 64 is a retaining joint;
6 and 66 are respective retaining pins.

Next, another embodiment of the present invention will be described in the fourth embodiment.
The explanation will be made based on FIGS. 5 and 6.

That is, in FIG. 4, the electric field line 58 (sensing line 60) similar to that of the previous embodiment is housed in a dedicated pipe 68 made of glass fiber reinforced plastic, which is also similar to the furring pipe 48 of the previous embodiment. , hidden. Here, the installation pipe 68 is made of a plurality of (only one is shown here) supports made of a predetermined length of an insulating material having sufficient mechanical strength, such as glass fiber reinforced plastic. They are supported by rods 70 at approximately equal intervals and are arranged in a fixed position. In addition, in the figure, 72 is an attachment part provided integrally at the base end of the support rod 70,
The support rod 70 is attached to a fence (including a metal fence), a concrete wall, etc. at the attachment portion 72.

Even in an electric field type intrusion detector in which the electric field line 58 and the sensing line 60 are arranged in this manner, the environmental resistance and, in turn, the reliability of the detector are significantly improved, similarly to the embodiments described above.

Further, FIG. 5 shows an example in which an electric field line 58 (sensing line 60) is fixedly arranged on a fence or concrete wall using a support rod 70 similar to the above embodiment. , unlike the above embodiment, the electric field line 58 (sensing line 60) is a bare conductor.
is integrally embedded in a rod 74 made of an insulating material with sufficient rigidity, such as glass fiber reinforced plastic, and this rod 74 is connected to the support rod 70.
It is supported by

Even if the electric field line 58 and the sensing line 60 are arranged in this manner, the same effects as in the above embodiment can be obtained.

Furthermore, in FIG.
0 is arranged on a concrete wall 78 by a U-shaped fastener 76, but even if such an arrangement is adopted, the same effect as in the above embodiment can be obtained. It is possible.

In this embodiment, instead of accommodating and concealing the electric field line 58 (sensing line 60) in the pipe 68, the electric field line 58 (sensing line 60) is installed as shown in FIG.
A similar effect can be obtained by disposing a rod 74 in which the sensing wire 60 is embedded integrally, and such a rod 74 can also be used as the rim of a fence as shown in Fig. 1. It is also possible to do so.

Although several embodiments of the present invention have been described in detail above, these are literal illustrations, and the present invention can be modified in various ways based on the knowledge of those skilled in the art without departing from the spirit thereof. It goes without saying that the present invention can be implemented with modifications, improvements, etc.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the main part of an intrusion prevention fence in which electric field lines and sensing lines of an electric field type intrusion detector according to the present invention are arranged, and FIG.
FIG. 3 is an exploded view for explaining the assembly structure of the fence shown in the figure. FIG. 3 is a view of essential parts showing an example of a structure for attaching a retaining post to the fence of FIG. 1. FIGS. 4 and 5 are explanatory views of main parts showing another example of the present invention, and FIG. 6 is a perspective view of main parts showing still another example of the present invention. FIG. 7 and FIG. 8 are perspective views corresponding to FIG. 1 and FIG. 6, respectively, showing a conventional electric field type intrusion detector. 30... Pillar, 32... Pillar, 34... Shinobi pillar, 48... Fuselage pipe, 50... Lattice rod,
58... Electric field line, 60... Sensing line, 62... Retaining pillar, 68... Arrangement pipe, 70... Support rod,
74...rod, 76...stop metal fitting.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) An electric field line that is arranged to surround at least a part of the intended protected area and generates a predetermined electric field, and along the electric field line is a sensing line arranged in parallel to detect the intensity of the electric field generated by the electric field line, and detecting foreign objects in the protected area based on fluctuations in the electric field intensity detected by the sensing line. In an electric field type intrusion detector configured to detect approach, the electric field line and the sensing line are each hidden within an insulating pipe having a predetermined rigidity,
Alternatively, an electric field type intrusion detector characterized in that it is disposed integrally embedded within an insulating rod having a predetermined rigidity. (2) The electric field type intrusion detector according to claim 1, wherein the insulating pipe or the insulating rod is made of glass fiber reinforced plastic.