JP2012234460A - Loop coil type vehicle sensing system and replacement method of loop coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a loop coil type vehicle sensing system and a replacement method of a loop coil in which the loop coil can be replaced at low cost, without restricting traffic.SOLUTION: The loop coil type vehicle sensing system includes: a loop coil 20 formed of a wound cable 21; and a pipe-shaped guide member 10 buried underground in a state of housing the loop coil 20. The guide member 10 includes: a frame-shaped body part 11; and passages 12 and 13 formed so as to protrude from the body part 11. The passages 12 and 13 are arranged so as to communicate with the ground. In addition, the passage 12 can be used to guide the cable 21 to the body part 11 and the passage 13 can be used to lead out the cable 21 from the body part 11 to the outside.

Description

  The present invention relates to a loop coil type vehicle sensing system for sensing a vehicle on a road or the like, and a loop coil replacement method used therefor.

  Conventionally, a loop coil type vehicle sensing system has been put to practical use as a system for sensing vehicles on roads, parking lots, railroad crossings, and the like. In the loop coil type vehicle sensing system, a vehicle is sensed by passing a weak current through a loop coil embedded in the ground and detecting a change in inductance value due to the approach of the vehicle.

  Generally, on a road, two loop coils are arranged with a set interval maintained for each lane. For this reason, the speed of the vehicle can be measured by the difference in time sensed by each loop coil. Furthermore, when a vehicle whose total length exceeds the set interval passes, it is possible to specify the size of the vehicle by utilizing the fact that the change in inductance value in each loop coil occurs at a short interval.

  In addition, the loop coil needs to be embedded at a location of about 10 cm to 15 cm from the ground in order to ensure vehicle detection. When the road on which the loop coil is laid is a new road, asphalt pavement is performed after the loop coil is arranged.

  On the other hand, when the road on which the loop coil is laid is an existing road, first, a groove having a width of about 10 mm and a depth of about 10 cm to 15 cm is provided on the ground in accordance with the shape of the loop coil. At this time, the groove is formed in a rectangular shape having a long side of about 2 m and a short side of about 1.5 m. Next, the cable is arranged in a winding shape along the groove, and in addition, a filler is filled in the groove. Thereafter, when the filler is dried and hardened, the laying of the loop coil is finished.

  Patent Document 1 discloses a technique for laying a loop coil in a state of being housed in a frame-like pipe in order to simplify the construction of the loop coil and to maintain the quality of the loop coil stably. . According to the technique disclosed in Patent Document 1, since the pipe is assembled in the shape of a loop coil (frame shape) in advance, and the cable is wound along the pipe in the factory, It is only necessary to bury the pipe in which the coil is accommodated. Also, the quality of the loop coil is maintained by the pipe.

JP 2006-72437 A

  By the way, since the loop coil is buried in a relatively shallow position, the insulation layer is deteriorated or damaged by a change in temperature, vibration of a vehicle traveling on the ground, intrusion of rainwater, etc. Disconnection or insulation failure may occur.

  In such a case, it is necessary to replace the loop coil. However, in the conventional laying method described above, it is not considered to replace the loop coil after laying. Need to dig up. For this reason, replacement requires a large cost, and in addition, traffic regulation that blocks the flow of traffic is necessary, which is a burden on the user.

  An example of an object of the present invention is to provide a loop coil type vehicle sensing system that can eliminate the above-described problems and enable the loop coil to be replaced at low cost without performing traffic regulation that blocks traffic flow, and It is to provide a method for replacing a loop coil.

(1) In order to achieve the above object, a loop coil type vehicle sensing system according to one aspect of the present invention is embedded in the ground with a loop coil formed by winding a cable and the loop coil accommodated therein. A pipe-shaped guide member, and the guide member includes a frame-shaped main body portion and a passage formed so as to protrude from the main body portion, and the passage communicates with the ground. It is arranged as follows.

  According to the above characteristics, the cables constituting the loop coil can be pulled out from the ground and a new cable can be introduced through the passage without dug up the road. Therefore, it is possible to replace the loop coil at a low cost without performing traffic regulation that blocks the flow of traffic. In the present invention, the term “communication with the ground” means, for example, a mode in which the passage communicates with the ground at the side surface of a gutter provided on the side of the road, the passage is a road surface, a slope beside the road, etc. An embodiment in communication with the ground.

(2) In the loop coil type vehicle sensing system according to the present invention, the guide member serves as the passage, the first passage for guiding the cable to the main body, and the cable from the main body to the outside. And a second passage for withdrawing. In this case, the cable can be pulled out and introduced more easily.

(3) In the loop coil type vehicle sensing system according to the present invention, it is preferable that the guide member is formed so that the second passage and a part of the main body portion are in a straight line. . In this case, since the cable can be naturally guided to the passage, the drawing work can be performed easily and efficiently.

(4) The loop coil type vehicle sensing system according to the present invention further includes a protective member that reduces pressure applied to the guide member from above when the guide member is buried in the ground. Is preferred. In this case, it is possible to improve the durability of the guide member.

(5) Moreover, it is preferable that the said protection member has a groove-shaped cross section and is formed along the external shape of the said guide member. Thereby, the pressure concerning a guide member can be reduced reliably.

(6) Moreover, in order to achieve the said objective, the replacement | exchange method of the loop coil in one side surface of this invention is the replacement | exchange method of the loop coil embed | buried in the ground, Comprising: (a) The main-body part which exhibits frame shape A pipe-shaped guide member comprising a passage formed so as to protrude from the main body, and embedded in the ground such that the passage communicates with the ground, and (b) winding a cable. A step of pulling out the loop coil formed in a circular shape and accommodated in the guide member through the passage; and (c) a new cable through the passage through the guide member. And a step of forming a loop coil.

  According to the above characteristics, the cables constituting the loop coil can be pulled out from the ground and a new cable can be introduced through the passage without dug up the road. Therefore, it is possible to replace the loop coil at a low cost without performing traffic regulation that blocks the flow of traffic.

(7) In the method of replacing a loop coil in the present invention, the guide member embedded in the ground in the step (a) is a first for guiding the cable to the main body as the passage. And a second passage for pulling out the cable from the main body portion to the outside, and in the step (c), at the boundary between the second passage and the main body portion, It is preferable that the new cable is introduced into the main body of the guide member via the first passage and wound while the second passage is closed. In this case, the cable can be pulled out and introduced more easily.

(8) In the loop coil replacement method according to the present invention, in the step (c), the new cable is connected to the guide member in a state in which a member functioning as a cleaner is attached to the tip of the new cable. It is preferable to introduce into the main body part. In this case, the inside of the guide member can be easily cleaned at the time of replacement.

  As described above, according to the present invention, it is possible to replace the loop coil at a low cost without restricting traffic.

FIG. 1 is a diagram showing an overall configuration of a loop coil type vehicle sensing system in an embodiment of the present invention. FIG. 2 is a cross-sectional view showing the overall configuration of the loop coil type vehicle sensing system according to the embodiment of the present invention. FIG. 3 is a plan view showing an example of a guide member used in the embodiment of the present invention. FIG. 4 is a perspective view showing an example of a guide member used in the embodiment of the present invention. FIG. 5 is a cross-sectional view showing a configuration of a loop coil type vehicle sensing system in which a cable is replaced by the loop coil replacement method according to the embodiment of the present invention. FIG. 6 is a cross-sectional view showing the configuration of the guide member when the cable is replaced by the loop coil replacement method according to the embodiment of the present invention. FIG. 7 is a diagram illustrating an example of a cleaner member used in the present embodiment. FIG. 8 is a diagram illustrating an example of the protective member 14 used in the present embodiment.

(Embodiment)
Hereinafter, a loop coil type vehicle sensing system and a loop coil replacement method according to an embodiment of the present invention will be described with reference to FIGS.

[Configuration of loop coil type vehicle sensing system]
Initially, the whole structure of the loop coil type vehicle sensing system in this Embodiment is demonstrated using FIGS. 1-4. FIG. 1 is a diagram showing an overall configuration of a loop coil type vehicle sensing system according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing the overall configuration of the loop coil type vehicle sensing system according to the embodiment of the present invention. FIG. 3 is a plan view showing an example of a guide member used in the embodiment of the present invention. FIG. 4 is a perspective view showing an example of a guide member used in the embodiment of the present invention.

  As shown in FIG. 1, the loop coil type vehicle sensing system 40 in the present embodiment includes a loop coil 20 laid on a road 50 and a vehicle sensor 30. Specifically, in the example of FIG. 1, two loop coils 20 are laid for each lane on a two-lane road 50.

  Each loop coil 20 is connected to a vehicle sensor 30. The vehicle detector 30 generates an electromagnetic field by passing a weak current through each loop coil 20, and when the inductance value of the electromagnetic field generated in the loop coil 20 changes due to the approach of the vehicle 51, the vehicle 51 is based on this change. Sense. The vehicle detector 30 identifies the speed and size of the vehicle 51 traveling in the lane using the time when the loop coil 20 senses the vehicle for each lane, and the identified information is transmitted to the traffic information center. (Not shown in FIG. 1) or the like.

  Moreover, as shown in FIGS. 2-4, the loop coil type vehicle sensing system 40 in this Embodiment is embed | buried in the ground in the state which accommodated the loop coil 20 in addition to the loop coil 20 and the vehicle detector 30. FIG. A pipe-shaped guide member 10 is provided. In the example of FIG. 2, only one loop coil 20 is shown.

  As shown in FIGS. 2 to 4, the guide member 10 includes a main body 11 having a frame shape and passages 12 and 13 formed so as to protrude from the main body 11. Inside the main body 11, the cable 21 is accommodated in a wound state and forms a loop coil 20 (see FIG. 4).

  In the present embodiment, the shape of the guide member may be a shape formed by winding a single pipe member, that is, a coil shape. In this case, the cable 21 does not overlap inside the guide member as in the examples shown in FIGS. 2 to 4. When the cable 21 is inserted into the guide member 10, the cable 21 is wound together with the loop coil 20. Become.

  As shown in FIG. 2, the guide member 10 is disposed such that the passages 12 and 13 communicate with the ground. Specifically, in the present embodiment, a side groove 52 is formed on the side of the road 50, and one ends of the passages 12 and 13 are open on the side surface of the side groove 52. 53 is a guardrail.

  In the present embodiment, the guide member 10 is provided with a passage 12 and a passage 13. Of these, the passage 12 is used to guide the cable 21 to the main body 11. Is used to pull out the cable 21 from the main body 11 to the outside. Furthermore, the guide member 10 is formed so that the passage 13 and a part 11a of the main body 11 are in a straight line from the viewpoint of facilitating the pulling out of the cable 21 (see FIGS. 3 and 4). In FIG. 3, reference numeral 12a denotes a guide plate that guides the cable 21 inserted from the passage 12 in the winding direction.

[Replacing loop coil]
Next, a method for replacing the loop coil in the embodiment of the present invention will be described with reference to FIGS. FIG. 5 is a cross-sectional view showing a configuration of a loop coil type vehicle sensing system in which a cable is replaced by the loop coil replacement method according to the embodiment of the present invention. FIG. 6 is a cross-sectional view showing the configuration of the guide member when the cable is replaced by the loop coil replacement method according to the embodiment of the present invention.

  First, as a premise, as shown in FIG. 2, the pipe-shaped guide member 10 is embedded in the ground so that the passage 12 and the passage 13 communicate with the ground in a state in which the loop coil 20 is accommodated. And

  Next, the cable forming the loop coil 20 is pulled out through the opening of the passage 13 exposed in the side groove 52 shown in FIG. The drawing may be performed using, for example, a winder. Thereby, only the guide member 10 is buried in the ground.

  Next, as shown in FIG. 5, a new cable 21 is introduced into the main body 11 of the guide member 10 through the passage 12 inside the guide member 10. At this time, as shown in FIGS. 5 and 6, the lid member 22 is in a state of closing the passage 13 at the boundary between the passage 13 and the main body 11. This is to prevent the cable 21 from coming out of the passage 13 without being wound.

  Moreover, in this Embodiment, the forming material of the cover member 22 is not specifically limited, The cover member 22 should just be what can prevent the cable 21 from going out of a channel | path. Further, the lid member 22 is fixed to the tip of the rod 23 so that the placement and removal of the lid member 22 can be performed smoothly. The operator can place and remove the lid member 21 by pushing or pulling the rod 23.

  Thereafter, when a new cable 21 is introduced into the main body 11, the new cable 21 is wound to form a loop coil. When the number of windings of the cable 21 reaches a predetermined number, the operator pulls the rod 23 and removes the lid member 22. And since the channel | path 13 and the part 11a of the main-body part 11 are linear, when a new cable is further sent out, the front-end | tip will reach the side groove 52 through the channel | path 13. FIG.

  As described above, according to the present embodiment, the old cable 21 can be pulled out and the new cable 21 can be inserted through the passages 12 and 13 of the guide member 10 without dug up the road 50. . For this reason, it is possible to replace the loop coil 20 at a low cost without performing traffic regulation that blocks traffic flow. Even when this embodiment is used, there is a possibility that road shoulder regulation is necessary to secure a working space, a parking space for a construction vehicle, and the like.

  In the present embodiment, when a new cable 21 is introduced into the guide member 10, a member that functions as a cleaner (hereinafter referred to as “cleaner member”) is attached to the tip of the new cable 21 as shown in FIG. It is preferable to attach 24. Examples of the cleaner member 24 include members having an action of adsorbing dust, dust, and the like, such as nonwoven fabric and sponge. FIG. 7 is a diagram illustrating an example of a cleaner member used in the present embodiment.

  Further, in the present embodiment, as shown in FIG. 8, when the guide member 10 is buried in the ground, the protective member 14 is installed to reduce the pressure applied to the guide member 10 from above. Is preferred. FIG. 8 is a diagram illustrating an example of the protective member 14 used in the present embodiment.

  In the example shown in FIG. 8, the protection member 14 has a groove-shaped cross section, and is embedded in the ground so that the guide member 10 is positioned inside the groove. Further, in the example shown in FIG. 8, only the cross section of the protection member 14 is illustrated, but actually, the protection member 14 is formed in a frame shape along the outer shape of the guide member 10.

  Further, in the example shown in FIG. 8, the guide member 10 and the protection member 14 are installed by forming a groove 54 in the road 50, arranging them in the interior, and then filling the filler 55. ing. When the filler 55 is cured, the installation of the guide member 10 and the protection member 14 is completed. If the protective member 14 is installed, the pressure applied to the guide member 10 is reduced, and as a result, the durability of the guide member is improved.

  In the example shown in FIGS. 2 and 5, the passage 12 and the passage 13 communicate with the ground on the side surface of the side groove 52, but the present embodiment is not limited to this aspect. For example, the passages 12 and 13 may be formed so as to communicate with the ground on road surfaces, roadside slopes, and the like.

  It should be understood that the embodiment disclosed this time is illustrative in all respects and not restrictive. The scope of the present invention is defined not by the above-mentioned meaning but by the scope of claims for patent, and is intended to include all modifications within the scope and meaning equivalent to the scope of claims for patent.

  As described above, according to the present invention, it is possible to replace the loop coil at a low cost without restricting traffic. The present invention is useful for exchanging loop coils laid on roads, parking lots, railroad crossings, and the like.

DESCRIPTION OF SYMBOLS 10 Guide member 11 Main part 11a Part of main part 12 Passage 13 Passage 20 Loop coil 21 Cable 22 Cover member 23 Rod 24 Cleaner member 30 Vehicle detector 40 Loop coil type vehicle detection system 50 Road 51 Vehicle 52 Side groove 53 Guard rail 54 Groove 55 Filler

Claims (8)

A loop coil formed by winding a cable;
A pipe-shaped guide member embedded in the ground in a state in which the loop coil is accommodated,
With
The guide member includes a main body having a frame shape and a passage formed so as to protrude from the main body, and the passage is disposed so as to communicate with the ground.
A loop coil type vehicle sensing system.   The guide member includes, as the passage, a first passage for guiding the cable to the main body, and a second passage for pulling the cable from the main body to the outside. The loop coil type vehicle sensing system according to claim 1.   The loop coil type vehicle sensing system according to claim 2, wherein the guide member is formed so that the second passage and a part of the main body portion are in a straight line.   The loop coil type vehicle sensing system according to any one of claims 1 to 3, further comprising a protection member that reduces pressure applied to the guide member from above when the guide member is buried in the ground. .   The loop coil type vehicle sensing system according to claim 4, wherein the protection member has a groove-shaped cross section and is formed along an outer shape of the guide member. A method for replacing a loop coil embedded in the ground,
(A) A pipe-shaped guide member including a frame-shaped main body portion and a passage formed so as to protrude from the main body portion is embedded in the ground such that the passage communicates with the ground. Steps,
(B) Pulling out the loop coil formed by winding the cable and housed in the guide member through the passage;
(C) introducing a new cable into the main body of the guide member through the passage and winding it to form a loop coil;
A method for replacing a loop coil, comprising: The guide member embedded in the ground in the step (a) includes, as the passage, a first passage for guiding the cable to the main body, and the cable from the main body to the outside. A second passage for pulling out,
In the step (c), the new cable is connected to the guide through the first passage while the second passage is blocked at the boundary between the second passage and the main body. Introduce into the body of the member and wind it
The method for replacing a loop coil according to claim 6.   In the step (c), the new cable is introduced into the main body of the guide member with a member functioning as a cleaner attached to the tip of the new cable. The loop coil replacement method described.

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