JP2800966B2 - Passage detection method for moving objects in cavities - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting the passage of a moving object in a cavity, and more particularly, to the detection of the passage of a moving object moving in a long cavity such as a tunnel excavation work site at a predetermined position in the longitudinal direction of the cavity. For detecting the passage of a moving object in a cavity.

[0002]

2. Description of the Related Art In order to manage the location of a person who moves in a long cavity such as a tunnel excavation work site, a location management method by area using an identification card which can be read separately has been proposed. This area by location management method, divided into a plurality of areas 2 _A to 2 _D the cavity 1 as shown in FIG. 4, to hold the spaced-readable identification card 5 to the person 3a into and out of the cavity 1, each The movement between the areas 2 and between each area 2 and the outside of the cavity 1 is restricted to the entrances 10 ₁ to 10 ₃ where the identification card reading means 7 and the passing direction detecting means 8 are installed.
In _{1-10 3} for reading the passage direction of the detection of the identification card 5. The passing direction signal for each person 3a detected at each entrance 10 is transmitted to the management office 13 via the sequencer 11 and the transmission line 12.
And the like, and the management office 13 or the like manages the location area in the cavity 1 for each person 3a.

One example of the remote reading system is an electromagnetic induction type non-contact data carrier system. In this case, an electromagnetic induction type card is used as the identification card 5 and the reading means 7 is used.
A magnetic flux generating means is provided to form a reading area by a magnetic flux around the reading means 7, and when the person 3a passes through the reading area, an identification signal is transmitted from the identification card 5 by electromagnetic induction based on the magnetic flux. The signal is read by the reading means 7. The non-contact data carrier system of the electromagnetic induction type has a feature that the directivity is weak and the change in the transmission distance is small even if the relative direction between the identification card 5 and the reading means 7 changes. The passing direction detecting means 8 can be a light source for two light beams intersecting the entrance passage at a distance in and out of each entrance 10 and a pair of photoelectric switches for detecting those light beams. It is cut off sequentially when passing 10 2
The light beams are detected by a pair of photoelectric switches, and the passing direction of the person 3a is determined from the order of the light beam interruption.

[0004]

However, the location management method shown in FIG. 4 has a problem that, when a plurality of persons 3a pass through the entrance 10 at the same time, it becomes difficult to detect the passage of each person 3a when passing or passing each other. Therefore, the passage of each entrance 10 is usually restricted to one person. Entrance 10 that can be moved only by one person in cavity 1 such as tunnel excavation work site
Is very inconvenient in operation. Entrance
Only pedestrians can be detected in 10, and there is also a problem that it is not possible to detect a vehicle moving in the cavity or a person who has boarded the vehicle.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for detecting the passage of a moving object in a cavity which does not restrict the passage of the moving object in the cavity to a narrow entrance.

[0006]

With reference to the embodiment of FIG. 1, a method for detecting the passage of a moving object in a cavity according to the present invention is described in which each moving object moves in and out of a long cavity 1. 3 is an electromagnetic attraction capable of remote reading by the annular reading means 7.
To hold the identification card 5 conductive type, a radially inner peripheral surfaces of the pair of plane cavity 1 that intersects the longitudinal axis of the cavity 1 spaced by a predetermined distance in the longitudinal direction in the longitudinal direction of the predetermined position in the cavity 1 and respectively along the annular line of intersection an annular reading means 7a and 7b of the identification card 5, and a cyclic read along the annular line of intersection
Allows free movement of the moving body over the entire inside of the taking means
And, one of the reading means 7a (or 7b) other reading means 7b after reading the specific identification cards 5 by only
When the specific identification card 5 is read by only (or 7a), the passing direction of the moving body 3 holding the specific identification card 5 at the predetermined position is determined.

[0007]

[Action] Figure 1 is divided in series a plurality of areas 2 _A to 2 _D a cavity 1 of a tunnel excavation work site in the longitudinal direction, respectively a pair of reading means 7a and 7b on the boundary of each area, the mobile An example of detecting passage between areas for each body 3 will be described. However, the present invention is intended only for the detection of the passage of the moving body 3,
The division into a plurality of areas is not an essential requirement of the present invention. Each of the reading means 7a and 7b is provided along an annular intersection line between a pair of planes intersecting the longitudinal axis of the cavity 1 and the radial inner peripheral surface of the cavity 1, and the moving body 3 passing through each plane is It passes inside each of the annular reading means 7a and 7b. Each reading means
If the maximum readable distance of 7a and 7b is longer than the radius of the cavity 1, the identification card 5 held by the moving body 3 can be read even when the moving body 3 passes anywhere on the plane. In addition, not only a pedestrian but also a moving body 3 such as a vehicle or an occupant of the vehicle can detect passage by holding the identification card 5.

FIG. 2A shows a moving body 3 which is a person who has attached an identification card 5 to a helmet in this case, passing through the cavity 1 provided with a pair of reading means 7a and 7b. FIG. 2 (B)
2 (F) schematically shows the temporal movement of the moving body 3 from the reading means 7a side to the 7b side as viewed from the top surface of the cavity 1. FIG. In the figure
6a and 6b indicate the readable range of each of the reading means 7a and 7b. In the illustrated example, the distance between the pair of reading means 7a and 7b is set to be wider than the sum of the maximum distances that can be read by the reading means 7a and 7b, and the overlapping of the readable ranges 6a and 6b is avoided. The simultaneous reading of the specific identification card 5 by the means 7a and 7b is avoided. However, the interval between the pair of reading means 7a and 7b is sufficient as long as there is a single readable range by each of the reading means 7a and 7b, even when the readable ranges 6a and 6b partially overlap.

Hereinafter, a method of detecting passage when the moving body 3 passes from the reading means 7a to 7b will be described with reference to FIG. 2. The same applies to the case where the moving body 3 passes from the reading means 7b to 7a. . The moving body 3 advances without reversing, and both reading means 7
After the state of FIG. 2B without reading by a and 7b, FIG.
As shown in (C), when the identification card 5 is read by only one of the reading means 7a, the fact that the reading of the specific identification card 5 is read by the reading means 7a is stored.
After that, each time the specific identification card 5 is read, it is determined which reading means 7a or 7b has been read, and the read data is compared with the stored reading means 7a. As shown in FIG.
It is determined that the document has passed from the reading unit 7a to the reading unit 7b when the reading is performed by only the reading unit 7a.

According to this determination method, for example, even when a plurality of identification cards 5 are read simultaneously by one reading means 7a, the reading means 7a
Can be stored and the reading by the other reading means 7b can be delayed for each identification card 5, so that the passing direction determination of each moving body 3 can be performed independently of the passing direction determination of the other moving bodies 3. Can be processed. Therefore, between the reading means 7a and 7b, the preceding moving body 3
Therefore, even if passing of the moving object 3 or passing of the moving objects 3 occurs, the passing direction of each moving object 3 can be reliably determined.

Further, according to the present invention, after the reading by only one of the reading means 7a, the passing direction is not determined until the reading by the other reading means 7b is performed. If the moving body 3 returns from the state of ()), the passing direction is not erroneously determined. In addition, once the state returns to the state shown in FIG. 2E after the passing direction is determined, the fact that the reading is performed by the other reading unit 7b at the time of the passing determination in FIG. 2E is stored. Reading means
When reading by 7a occurs, the reading means 7b
Can be determined to have passed to the side.

In this manner, the object of the present invention is to provide a "method of detecting the passage of a moving object in a cavity which does not restrict the passage of the moving object in the cavity to a narrow entrance".

[0013]

FIG. 1 shows an embodiment using three sets of annular reading means 7a and 7b with magnetic flux generating means.
And 9b represent the magnetic flux generated by the magnetic flux generating means of each of the reading means 7a and 7b. Each magnetic flux generating means is an annular reading means 7a.
And an annular current is passed along each of the annular reading means 7a.
And 7b which create a magnetic flux 9a and 9b penetrating the space inside the cavity inside 7b.
The reach of the magnetic fluxes 9a and 9b having a certain strength or more is the readable range 6a and 6b of each of the reading means 7a and 7b (see FIG. 2). The identification card 5 held by the moving body 3 transmits an identification signal by electromagnetic induction based on the magnetic flux 9a or 9b when passing through the readable range 6a or 6b, and the transmitted identification signal is read by the reading means 7a or 7b. .

FIG. 3 shows an example of a flow chart of a pass detection method for determining a pass direction by providing a memory 16 (see FIG. 1) corresponding to each identification card 5. The memory 16 selectively stores which of the reading means 7a and 7b each identification card 5 has been read. For example, as shown in FIG. 1, the memory 16 has a controller 15 connected to the reading means 7a and 7b. Can be provided. A pair of reading means 7a and 7b are provided so that the readable range (FIG. 2) does not overlap.
The reading operation of 7b is performed simultaneously (step 301). In step 302, the presence or absence of reading is determined.
If there is no reading by a or 7b, the process returns to step 301 and repeats the reading operation.
At step 3, the identification card 5 is individually identified. The illustrated example shows a flowchart when a specific identification card 5 whose ID code is 100 is read, for example.
Are read for each identification card 5
Is repeated.

In step 304, the specific identification card 5
The presence or absence of storage in the memory 16 corresponding to, that is, the presence or absence of reading of the specific identification card 5 up to the previous time is determined. If there is no storage, the process proceeds to step 312, and the reading unit 7a or 7b that has read the current specific identification card 5 It is stored in the memory 16 (steps 312 to 314). If the specific identification card 5 has been read up to the last time and stored in the memory 16, step 305
Proceed to. Symbols 7a and 7b in step 305 indicate that the process proceeds to step 309 when the specific identification card 5 is read by the reading unit 7a, and proceeds to step 306 when the specific identification card 5 is read by the reading unit 7b. The same applies to symbols 7a and 7b in steps 306, 309 and 312.

At step 306, it is determined which read means 7a or 7b is stored in the memory 16. If the same read means 7b as the read means 7b read this time is stored, the flow directly proceeds to step 312. When the different reading means 7a are stored, it is determined that the moving body 3 has passed, and in step 307, the passing direction of the moving body 3 holding the specific identification card 5 is determined. The determination result is transmitted via, for example, the sequencer 11 and the transmission path 12 shown in FIG. 1 (step 308). Steps 309 to 311 are the same, and the reading means 7a read this time and the reading means 7b stored
If the values are different from each other, the processing of the passage direction determination (step 310) and the transmission of the passage signal (step 311) are performed.

In steps 312 to 314, the reading means 7a or 7b which has read the specific identification card 5 this time is stored in the corresponding memory.
After storing it in step 16, the process returns to step 301 to perform the next reading process. When a plurality of identification cards 5 are read at the same time, the processing of steps 304 to 314 is performed for all the read identification cards 5, and the process returns to step 301.

[0018]

As described above in detail, the method for detecting the passage of a moving object in a cavity according to the present invention has a structure in which each moving object moving in a long cavity holds an identification card which can be read separately from the moving object. A pair of annular reading means are provided at predetermined intervals in the direction, and after reading the specific identification card by only one of the reading means, hold the specific identification card when reading the specific identification card only by the other reading means. Since the passing direction of the moving object is determined, the following remarkable effects are obtained.

(A) Reading means can be provided regardless of the cross-sectional shape of the cavity. (B) It is possible to detect the passage of each moving object without providing a narrow doorway in the cavity. (C) Not only pedestrians but also vehicles and crews of vehicles can be detected. (D) Since the passing direction is detected only by the reading means, a photoelectric switch or the like conventionally used for detecting the passing direction is not required. (E) Even if there is a passing or a passing of the moving object, it is possible to easily detect the passage of each moving object.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of one embodiment of the present invention.

FIG. 2 is an explanatory diagram of moving object passage detection according to the present invention.

FIG. 3 is an example of a flow chart of passage detection of the present invention.

FIG. 4 is an explanatory diagram of a conventional passage detection method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cavity 2 Area 3 Mobile 3a person 5 Identification card 6 Reading area 7 Reading means 8 Passing direction detecting means 9 Magnetic flux 10 Doorway 11 Sequencer 12 Transmission path 13 Office 14 Computer 15 Controller 16 Memory.

Continuation of the front page (56) References JP-A-4-93500 (JP, A) JP-A-3-81890 (JP, A) JP-A-2-176966 (JP, A) JP-A-1-194096 (JP) JP-A-6-168366 (JP, A) JP-A-64-1421 (JP, U) JP-A-3-78291 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB Name) G07C 9/00 G06K 17/00 E21F 11/00

Claims (4)

(57) [Claims] 1. An electromagnetic induction type identification card which can be separated and read by an annular reading means is held by each moving body which moves in and out of the long cavity, and moves at a predetermined position in the longitudinal direction in the cavity. the longitudinal direction an annular reading means respectively the identification card along the annular line of intersection between the radially inner surface of said pair of plane cavity intersecting the longitudinal axis of the cavity separated by a predetermined distance, the Along the circular intersection
Free movement of the moving object over the entire inner surface of the circular reading means
Allow the passage of the predetermined position of one of said reading means only by the moving body such was held a specific identification card according to only the other reading means after reading when reading the specific identification card specific identification card A method for detecting the passage of a moving object in a cavity by determining the direction. 2. The passage detecting method according to claim 1, wherein the predetermined distance in the longitudinal direction between the pair of planes is larger than the sum of the maximum separation distances readable by each of the annular reading means. A method for detecting the passage of a moving object. 3. A passage detecting method according to claim 2, further comprising a memory for selectively storing which of said reading means has been read at the time of reading in correspondence with each of said identification cards, Determining the reading means read for each identification card, determining the presence or absence of storage in the memory corresponding to the specific identification card, and determining whether the reading means is stored and stored in the corresponding memory and the determined reading means Is determined, the passing direction of the moving object holding the specific identification card is determined, and a cycle of storing the determined reading means in a memory corresponding to the specific identification card before the next reading is repeated. A method for detecting the passage of a moving object in a cavity. 4. The passage detecting method according to claim 1, further comprising: a magnetic flux generating means for generating a magnetic flux inside the reading means by flowing an annular current to the respective reading means along the intersection line. A method for detecting the passage of a moving object in a cavity as an electromagnetic induction type card for transmitting an identification signal capable of detecting the identification card by the reading means by electromagnetic induction based on the magnetic flux.