JP4037721B2 - Indicator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention displays geographical information such as information on the location of land and roads used when conducting a land ownership survey, or location information of underground buried objects such as cables, water pipes, gas pipes, etc. It is related with the indicator for this.
[0002]
[Prior art]
In order to conduct a land registration survey, for example, a surveying pile in the form of an elongated bar is embedded in the ground as a position indicator, and its head is exposed on the ground surface. In some cases, a display plate with a land division number is nailed to the top surface of the survey pile (for example, Utility Model Document 1).
[0003]
[Utility model document 1]
Japanese Utility Model Publication No. 2-118815 (page 3, line 17 to page 4, line 5, FIG. 1)
[0004]
If the head of this survey pile is buried with fallen leaves or snow, it will be difficult to confirm the position. On the other hand, it is conceivable to confirm the position by burying the magnet body together with the surveying pile and detecting the magnetic field of the magnet body with a locator that is a magnetic detector. As shown in FIG. 7, the magnet body 12 generates a magnetic flux 70 from the north pole to the south pole, and this is detected from above by a locator (not shown). Such a method has already been used to confirm a sign indicating the position of an underground buried object such as a water pipe or a gas pipe.
[0005]
By the way, as the shape of the magnet body 12 is elongated, a stronger magnetic flux is obtained outward in the axial direction. Therefore, it is preferable to have a long and narrow shape as shown in FIG. 7, but in order to obtain such a magnet body 12, a large mass of the magnet body 12 that is more expensive than other metals is required. Moreover, the magnet body 12 is inferior in workability compared with other metals.
[0006]
SUMMARY OF THE INVENTION An object of the present invention is to provide a marking device that is excellent in processability, inexpensive, and capable of obtaining a strong magnetic field and easily confirming the position.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a sign according to the present invention is a sign that is partially or entirely embedded in the ground and displays geographical information, and has magnets at both ends of a bar made of a magnetic material. contacting a body comprising a magnetic field generating unit comprising the bar is vertically Chi lifting longitudinal, are four times more elongated der the diameter length of the elongated pile having a longitudinal direction in the vertical direction The magnetic field generating unit is built in the head.
[0008]
According to the said structure, since a magnet body is short, it is excellent in workability and inexpensive. Since the bar can be made of, for example, iron, the workability is excellent even if it is long. Moreover, since the magnetic flux density outward in the axial direction is improved by the bar at the intermediate portion, the magnetic field detection range is increased, and the position of the indicator can be easily confirmed.
[0009]
Furthermore, since the bar has an elongated shape having a longitudinal direction in the vertical direction, the magnetic bar has a stronger elongated magnetic shape, that is, an axially outward magnetic flux, that is, a magnetic flux reaching the upper ground surface becomes stronger. Therefore, the position confirmation becomes easy.
In addition, since the magnetic field generating unit is built in the head of an elongated pile that has a longitudinal direction in the vertical direction, even if the head of the pile is buried with fallen leaves or snow, it can be easily positioned by a locator that is a magnetic detector. Confirmation can be made.
[0011]
Furthermore, the sign according to the present invention is a sign that is partially or wholly embedded in the ground and displays geographical information, with a magnet body in contact with both ends of a bar made of a magnetic material. The bar has a longitudinal direction in the vertical direction and has a length that is four or more times the diameter, and the magnetic field generation unit is housed in a non-magnetic container. Is attached with the geographical information. According to this structure, even if it does not attach a magnetic field generating unit directly to underground buried objects, such as a water pipe and a gas pipe, a position can be easily confirmed with a locator by embedding together. In addition, if information about underground buried objects is attached to a non-magnetic container, it is possible to know information that cannot be obtained from the appearance of the buried objects when actually excavated by construction.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. A magnetic field generation unit 10 shown in FIG. 1 is formed by bringing magnet bodies 12 and 12 into contact with both ends of a bar 11 made of a magnetic material. For the bar 11 made of a magnetic material, for example, iron, silicon steel, electromagnetic steel or the like is preferably used. The longer the bar 11 is, the stronger the magnetic flux is. However, experiments have shown that the ratio of the length to the diameter of the bar is preferably 1: 4 or more. For example, when the diameter of the bar 11 is 10 mm, the length is 50 mm, the diameter of the magnet bodies 12 and 12 is 9 mm, the thickness (length) is 3 mm, and the upper surface of the magnet body is the N pole, The average was about 80 cm. On the other hand, when the magnetic body 11 is not used, a long magnet body 12 having a diameter of 9 mm and a length of 30 mm is required to obtain a detection distance of 80 cm by the same locator.
[0013]
Next, the case where the said magnetic field generation unit 10 is incorporated in the survey pile which is a kind of indicator is demonstrated.
The surveying pile A shown in FIG. 2 is elongated, for example, a sharpened portion 22 is formed on the distal end side of a pile body 21 having a cross-shaped cross section, and a head portion 23 having a quadrangular prism shape is formed on the other side. The magnetic field generating unit 10 is built in the center with the longitudinal direction as the vertical direction. The cross-sectional shape of the pile main body 21 constituting the pile A can be various shapes such as a triangle, a polygon more than a quadrangle, and a circle.
[0014]
The pile body 21 is a non-magnetic material such as resin, wood, or concrete, and a resin-made one is usually preferably used. As a material used for this resin-made pile main body 21, the recycled resin which is a waste product of the resin product formed with thermoplastics, such as polyethylene, a polypropylene, polyester, a styrene, polyamide, polysulfone, is used, for example.
[0015]
The magnetic field generation unit 10 is attached to the pile A by insert molding. By arrange | positioning on the center axis line of the pile A, the intensity | strength of the pile A does not fall.
[0016]
As shown in FIG. 3, the pile A including the magnetic field generation unit 10 is embedded in the ground G with the longitudinal direction set as the vertical direction and a part of the head 23 exposed. The head 23 may be provided with a display plate indicating the division number. Thereby, the magnetic field generation unit 10 is also embedded with the longitudinal direction as the vertical direction. The position confirmation of the pile A can be easily performed by detecting the magnetic field of the magnetic field generation unit 10 with a locator.
[0017]
As shown in FIG. 4, when the pile A has the cap 24 on the head 23, the magnetic field generating unit 10 is fitted and held in the holding hole 30 provided in the cap 24, and the cap 24 is held in this state. Is inserted into a mold for forming a pile A, and a recycled resin is injected to form a pile A having a built-in magnetic field generation unit 10. The cap 12 is made of a non-magnetic material such as polyethylene, polypropylene, fluorine, polycarbonate, polysulfone, or polyester, or a thermosetting resin such as phenol or polyimide.
[0018]
In the indicator B shown in FIG. 5, the magnetic field generating unit 10 is accommodated in a nonmagnetic container 50.
The said indicator B is embed | buried under the ground G with the water pipe 60 which is an underground embedment, as shown in FIG. When burying the water pipe 60 by digging the groove 62, soil is put in a plurality of times. At that time, for example, the indicator B is embedded above the 60. The indicator B is embedded with the longitudinal direction as the vertical direction, and the magnetic field generated from the magnetic field generation unit 10 is detected by the locator 61 from above. According to this configuration, it is possible to easily confirm the position with the locator 61 by embedding the indicator B together with the water pipe 60 without being attached directly. In addition, if information about underground buried objects such as pipe types and piping points such as water pipes is attached to the non-magnetic container 50, for example, when it is actually dug up by construction, Can also learn about information that cannot be obtained.
[0019]
In addition, since the magnetic field outside the magnetic field generation unit 10 is generated from the N pole and travels toward the S pole, the direction where the N pole, which is the source of generation, is the upper surface is closer to the ground surface than the case where the S pole is the upper surface. Since the magnetic flux to reach becomes strong, detection by the locator becomes easy. Further, the magnet body 12 may be attached only to one end of the magnetic body 11. In that case, it is preferable to make the magnetic body 11 longer.
[0020]
【The invention's effect】
As described above, according to the indicator according to the present invention, the magnet body can be short, so that it is excellent in workability and inexpensive. Since the bar can be made of, for example, iron, the workability is excellent even if it is long. Moreover, since the magnetic flux density outside in the axial direction is improved by the bar at the intermediate portion, the detection range of the magnetic field is increased and the position of the indicator can be easily confirmed.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an example of a magnetic field generating unit according to the present invention.
FIG. 2 is a perspective view showing an example of a survey pile including the same magnetic field generation unit.
FIG. 3 is a cross-sectional view of the main part when the surveying pile of FIG. 3 is embedded in the ground.
FIG. 4 is a cross-sectional view of the main part when the surveying pile has a cap.
FIG. 5 is a perspective view showing a state where the magnetic field generating unit according to the present invention is housed in a non-magnetic container.
6 is a cross-sectional view when the magnetic field generating unit housed in the non-magnetic container of FIG. 5 is embedded in the ground together with a water pipe.
FIG. 7 is a perspective view showing a conventional indicator.
[Explanation of symbols]
A, B ... marking device, 11 ... bar made of magnetic material, 12 ... magnet body, 10 ... magnetic field generating unit, G ... ground.

Claims (2)

A sign that is partially or wholly embedded in the ground and displays geographical information,
A magnetic field generating unit comprising a magnetic body in contact with both ends of a bar made of a magnetic body,
The bar is Chi lifting longitudinal in the vertical direction, are four times more elongated der the diameter length,
A sign in which the magnetic field generating unit is built in the head of an elongated pile having a longitudinal direction in the vertical direction . A sign that is partially or wholly embedded in the ground and displays geographical information,
A magnetic field generating unit comprising a magnetic body in contact with both ends of a bar made of a magnetic body,
The bar has a longitudinal direction in the vertical direction, and has a long and narrow shape whose length is four times or more of the diameter,
The magnetic field generating unit is housed in a non-magnetic container ;
A sign in which the geographical information is attached to the container.

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