Method for installing magnetic marker and installation auxiliary tool

Abstract

To provide an installation auxiliary tool that can achieve both positional accuracy of a magnetic marker and construction efficiency thereof.SOLUTION: An auxiliary tool 1 for arranging a magnetic marker 3 in a storage hole 58 drilled in a road surface 50S comprises a columnar holding member 11 having a holding surface 11S of the magnetic marker 3 at an end in the axial direction, and a detaching member 13 combined with the holding member 11 so as to be able to move axially relative to the holding member 11. A combination of the holding member 11 and the detaching member 13 is configured such that the detaching member 13 can abut against the magnetic marker 3 held on the holding surface 11S and the holding member 11 can be retracted axially away from the magnetic marker 3 while maintaining a state in which the detaching member 13 abuts against the magnetic marker 3.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a construction method for laying magnetic markers on vehicle tracks and an auxiliary tool for construction. [Background technology]

[0002] Conventionally, a system has been proposed that uses magnetic markers placed along the vehicle's path to achieve automatic steering of the vehicle (see, for example, Patent Document 1). Such a system can reduce the burden on the driver by assisting the vehicle's driving, and can also achieve automatic driving of the vehicle.

[0003] For example, Patent Document 2 listed below describes a construction vehicle equipped with drills for drilling storage holes for magnetic markers into the road surface. This construction vehicle has drills located at the front and rear of the vehicle body. By operating the drills at the front and rear while keeping the position of the construction vehicle fixed, it is possible to efficiently drill two storage holes with a specified distance between them.

[0004] Patent Document 2 describes a method of installing two magnetic markers at a specified distance apart, at 10m intervals along the track. For example, if the section of track where the magnetic markers are installed spans 20km, there will be 2000 such installation locations, meaning that 4000 magnetic markers will need to be installed. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 7260856 [Patent Document 2] Patent No. 6920975 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the conventional magnetic marker system described above has the following problem: There is a technical problem in that it is necessary to improve installation efficiency by shortening the installation time for each magnetic marker while ensuring installation accuracy of the magnetic markers.

[0007] The present invention has been made in consideration of the above-mentioned conventional problems, and aims to provide a magnetic marker installation method and installation auxiliary tools that can achieve both installation accuracy and installation efficiency. [Means for solving the problem]

[0008] One aspect of the present invention is an auxiliary tool for placing a magnetic marker in a receiving hole drilled in a road surface when installing a magnetic marker that exerts magnetism on the outside, comprising: a columnar holding member having a holding surface for the magnetic marker at an axial end thereof; a release member coupled to the retaining member so as to be axially movable relative to the retaining member; The combination of the holding member and the releasing member may be such that the releasing member is positioned to abut against the magnetic marker held on the holding surface, and The auxiliary tool for construction is configured so that the holding member can be retracted axially away from the magnetic marker while the detaching member remains in contact with the magnetic marker.

[0009] One aspect of the present invention is a construction method for placing a magnetic marker in a receiving hole drilled in a road surface when constructing a magnetic marker that exerts magnetism on the outside, comprising the steps of: a columnar holding member having a holding surface for the magnetic marker at an axial end thereof; a release member coupled to the holding member so as to be axially movable relative to the holding member; The holding member is inserted into the receiving hole with the holding surface holding the magnetic marker at the tip end side, This is a method of installing a magnetic marker, in which the detachment member is kept in contact with the magnetic marker held on the holding surface, and the holding member is retracted axially away from the magnetic marker to remove it from the storage hole. [Effects of the Invention]

[0010] The present invention is an invention for accurately placing a magnetic marker in a storage hole. This invention utilizes a columnar holding member with a magnetic marker holding surface at its axial end, and a release member that is combined with the holding member so as to be movable axially relative to the holding member. By utilizing the combination of the holding member and the release member, the magnetic marker can be placed in the storage hole by inserting the holding member that holds the magnetic marker into the storage hole and then retracting the holding member while abutting the release member against the magnetic marker.

[0011] According to the present invention, the holding member can be retracted while the magnetic marker is held down by the detaching member. By retracting the holding member in this manner, the magnetic force acting between the holding member and the magnetic marker does not disturb the position of the magnetic marker. If an installation method or auxiliary installation tool is used that does not disturb the position of the magnetic marker in the holding hole, the efficiency of the work of placing the magnetic marker in the holding hole can be improved.

[0012] As such, the present invention is an excellent invention that can achieve both high efficiency in installing magnetic markers and high accuracy in installing magnetic markers. [Brief explanation of the drawings]

[0013] [Figure 1] An explanatory diagram showing a track on which magnetic markers are installed. [Figure 2] A perspective view showing a magnetic marker with a height of 30 mm. [Figure 3] A perspective view showing a magnetic marker with a height of 5 mm. [Figure 4] An explanatory diagram showing the embedded state of a magnetic marker with a height of 30 mm. [Figure 5] An explanatory diagram showing the embedded state of a magnetic marker with a height of 5 mm. [Figure 6] A diagram explaining the installation procedure for magnetic markers. [Figure 7] Configuration diagram of auxiliary tools. [Figure 8] An explanatory diagram showing how a magnetic marker is placed in a storage hole using a holding member. [Figure 9] 10 is an explanatory diagram showing how the insertion depth of the holding member into the receiving hole is measured. FIG. [Figure 10] FIG. 10 is an explanatory diagram showing the state in which the detaching member abuts against the magnetic marker. [Figure 11] FIG. 10 is an explanatory diagram showing a state in which the holding member is pulled up. [Figure 12] Assembly diagram of another auxiliary tool, part 1. [Figure 13] Configuration diagram of another auxiliary tool, part 2. [Figure 14] Assembly diagram for another auxiliary tool, part 2. [Figure 15] Diagram of the third auxiliary tool. [Figure 16] 10A and 10B are explanatory diagrams illustrating how to use an auxiliary tool including a reference plate on which a ruler is erected. [Figure 17] FIG. 10 is a perspective view of a holding member with a bolt. [Figure 18] 10A and 10B are explanatory diagrams illustrating a method of using a holding member provided with a bolt. DETAILED DESCRIPTION OF THE INVENTION

[0014] The embodiments of the present invention will be specifically described using the following examples. Example 1 This example relates to an auxiliary tool 1 and an installation method that are useful for efficiently installing magnetic markers 3 on a track 50 for a vehicle 5. The details of this will be described with reference to FIGS.

[0015] The magnetic markers 3 in this example are magnetic products that are laid at regular intervals along the road 50 of the vehicle 5. By utilizing the magnetic markers 3 laid along the road 50, it is possible to realize driving assistance such as lane-following driving of the vehicle 5 by automatic steering and lane departure warning.

[0016] The magnetic marker 3 is a cylindrical ferrite plastic magnet. The magnetic marker 3 is the magnet itself, and like a magnet, it has a cylindrical shape. One end face of the cylindrical shape of the magnetic marker 3 forms the north pole, and the other end face forms the south pole. The magnetization direction of the magnetic marker 3 is along the axial direction of the cylindrical shape.

[0017] The magnetic marker 3 has a diameter of 30 mm. The axial dimension (height) of the magnetic marker 3 comes in two sizes: 20 mm and 5 mm. The magnetic marker 3 with a height of 20 mm and a diameter of 30 mm (Figure 2) is intended for vehicles with a high vehicle height, such as buses. The magnetic marker 3 with a height of 5 mm and a diameter of 30 mm (Figure 3) is intended for vehicles that transport goods in facilities such as factories.

[0018] The magnetic markers 3 are placed in storage holes 58 drilled in the road surface 50S, as shown in Figure 4, which uses a magnetic marker 3 with a height of 20 mm as an example. After being placed in the storage holes 58, the magnetic markers 3 are backfilled with road repair material 507. The road repair material 507 is a paving material such as asphalt, or a road repair material primarily made of resin. If the diameter of the storage holes 58 is small, slightly more than 30 mm, it is highly likely that the placement work of the magnetic markers 3 cannot be carried out efficiently. On the other hand, if the diameter of the storage holes 58 is too large, the magnetic markers 3 will be prone to tilting within the storage holes 58. Taking these factors into consideration, in this example, the diameter of the storage holes 58 is set to 35 mm.

[0019] In the case of a magnetic marker 3 with a height of 20 mm, the axial dimension is more than half the diameter of the storage hole 58, which is 35 mm in diameter. In this case, there is little risk of the magnetic marker 3 tilting inside the storage hole 58, and there is also little risk of its axial direction deviating from the vertical direction. On the other hand, in the case of a magnetic marker 3 with a height of 5 mm, the height dimension is insufficient compared to the diameter of the storage hole 58, which is 35 mm in diameter. In this case, the magnetic marker 3 is likely to tilt inside the storage hole 58 (see Figure 5). If the magnetic marker 3 tilts inside the storage hole 58, the axial direction (height direction) of the magnetic marker 3 will deviate from the vertical direction. In this example, the axial direction of the magnetic marker 3 coincides with the magnetization direction. If the magnetization direction of the magnetic marker 3 deviates from the vertical direction, the positioning accuracy of the vehicle 5 using the magnetic marker 3 will be impaired.

[0020] Thus, when placing a magnetic marker 3 with a height of 5 mm in the storage hole 58, great care must be taken to ensure that the magnetic marker 3 does not tilt within the storage hole 58. This requirement can be a factor that hinders work efficiency. The auxiliary tool 1 in this example is a construction jig that achieves both construction accuracy of the magnetic marker 3 (placement accuracy in the storage hole 58) and work efficiency.

[0021] Here, with reference to Figure 6, the installation procedure for the magnetic marker 3 will be briefly explained. When installing the magnetic marker 3, first, a storage hole 58 is drilled in the road surface 50S using a drill drill 101. The drill drill 101 has a controlled drilling depth and is capable of drilling a hole 581 of a predetermined depth. Sand 509 is supplied to the hole 581 created by the drill drill 101 and compacted. Compaction is performed using a compaction tool 109 consisting of a shaft portion inserted into the hole 581 and a flange portion with a larger diameter than the hole. The length of the shaft portion is 15 mm.

[0022] By using a compaction tool 109 to compact the bottom of the hole 581 so that the flange portion contacts the road surface 50S, a 15 mm deep storage hole 58 can be formed with high precision. After the magnetic marker 3 is placed in the storage hole 58, the storage hole 58 is backfilled using road repair material 507, thereby completing the installation of the magnetic marker 3. The auxiliary tool 1 of this example can be used to place a 5 mm high magnetic marker 3 (see Figure 3) in the storage hole 58. Using the auxiliary tool 1 of this example makes it possible to achieve both work efficiency and placement precision.

[0023] (Configuration of auxiliary tools) The auxiliary tool 1 (Fig. 7) of this example is configured by combining a cylindrical holding member 11 and a separation member 13 having an axial portion 131. The auxiliary tool 1 of this example is further combined with a reference plate 15 for measuring the insertion depth of the holding member 11 into the storage hole 58. The auxiliary tool 1 is a work support tool that assists in the work of placing the magnetic marker 3 in the storage hole 58. By using the auxiliary tool 1, it is possible to reduce variation in the posture of the magnetic marker 3 (height 5 mm) placed in the storage hole 58.

[0024] The holding member 11 is a member that holds the magnetic marker 3 when placing the magnetic marker 3 in the storage hole 58. The holding member 11 is made of carbon steel, which is an example of a soft magnetic material, and is a member to which a magnet is attracted. The holding member 11 attracts and holds the magnetic marker 3 by utilizing the magnetic force of the magnetic marker 3 itself, which is a magnet. In addition to carbon steel such as S45C, soft iron, electromagnetic soft iron (silicon steel), structural steel such as SC46, and the like are also examples of soft magnetic materials.

[0025] The holding member 11 is a cylindrical member with a through hole 110 formed along the axial direction (direction of the central axis). The holding member 11 has an outer diameter of 30 mm, an inner diameter of 20 mm, and a total length of 30 mm. The holding member 11 has a fixed axial orientation. The side inserted into the storage hole 58 is the front end side, and the opposite side is the rear end side. The end face of the front end side inserted into the storage hole 58 forms a holding surface 11S that can hold the magnetic marker 3 by the magnetic force of the magnetic marker 3.

[0026] Five scale lines 118 for measuring the insertion depth into the receiving hole 58 are provided on the outer peripheral surface of the holding member 11. The scale lines 118 are an example of marks or scales. Each scale line 118 is a 1 mm wide line that runs around the entire outer periphery of the holding member 11, and is provided with no gaps between adjacent scale lines 118. The five scale lines are formed in a 5 mm wide range from 13 mm to 18 mm in the axial direction from the holding surface 11S. The five scale lines 118 are color-coded to enable them to be distinguished from adjacent scale lines 118. The colors of each scale line 118, from the side closest to the holding surface 11S, are red, yellow, blue, yellow, and red in that order. The combination of red, yellow, and blue is distinguishable by workers with color vision impairments.

[0027] The detaching member 13 is a member that holds the magnetic marker 3 when separating the holding member 11 from the magnetic marker 3 placed in the accommodation hole 58. The detaching member 13 is a member made of a non-magnetic resin material such as nylon, and does not attract magnets. The detaching member 13 may be a member made of a non-magnetic non-metallic material such as resin, or a non-magnetic material (non-magnetic metallic material) such as stainless steel or copper alloy. The detaching member 13 has a shaft 131 with an outer diameter of 19 mm and a length of 40 mm, and a flange 133 with an outer diameter of 30 mm at one end of the shaft 131. The shaft 131 is inserted into the through hole 110 of the holding member 11.

[0028] The combination of the holding member 11 and the releasing member 13 allows them to move forward and backward relative to each other in the axial direction. By inserting the shaft portion 131 into the through-hole 110 of the holding member 11, the releasing member 13 can be displaced forward relative to the holding member 11. Furthermore, with the shaft portion 131 of the releasing member 13 inserted and disposed in the through-hole 110, the holding member 11 can be displaced backward relative to the releasing member 13 in the axial direction.

[0029] The reference plate 15 is an example of a measurement member for measuring the insertion depth of the holding member 11 into the accommodation hole 58. The reference plate 15 is flat with an outer diameter of 100 mm and a plate thickness of 5 mm. An arrangement hole 150 with an inner diameter of 31 mm is provided in the center of the reference plate 15. The arrangement hole 150 is a hole for passing through and arranging the holding member 11. In this example, a circular hole is exemplified as the arrangement hole 150, which is an example of an arrangement portion. The arrangement portion may have an inner peripheral shape that follows part of the outer periphery of the holding member 11, and may be, for example, a semicircular recess.

[0030] There is no distinction between the front and back of the reference plate 15. When the reference plate 15 with the holding member 11 passing through it is placed on the road surface 50S, the surface facing the road surface 50S forms the contact part 151 with the road surface 50S. The other surface facing upward forms the reference part 152 with which the relative position in the height direction is compared with the scale lines 118 of the holding member 11.

[0031] (Magnetic marker placement work) The following describes the work of placing the magnetic marker 3 in the storage hole 58 using the auxiliary tool 1. By using the auxiliary tool 1, the work can be performed efficiently with high precision, regardless of the worker's level of skill or whether or not the worker has a color vision disorder.

[0032] A single holding member 11 is prepared before the separation member 13 is combined, and the magnetic marker 3 is attracted to the holding surface 11S. The holding member 11 is inserted into the storage hole 58 with the holding surface 11S that holds the magnetic marker 3 facing the tip side. By inserting the holding member 11 until the tip side presses against the bottom side (Figure 8), the magnetic marker 3 can be placed on the bottom side of the storage hole 58.

[0033] The holding member 11 inserted into the accommodating hole 58 presses the magnetic marker 3 against the bottom surface of the accommodating hole 58 due to its own weight. Here, the depth of the accommodating hole 58 is 15 mm, and the height (axial dimension) of the magnetic marker 3 is 5 mm. If the positioning of the magnetic marker 3 in the accommodating hole 58 is appropriate, the holding member 11 will be inserted 10 mm into the accommodating hole 58 at its tip end. A reference plate 15 can be used to measure the insertion depth of the holding member 11.

[0034] The reference plate 15 is extrapolated onto the holding member 11, whose tip end is inserted into the receiving hole 58 and which is standing on the road surface 50S. The reference plate 15 has an inner diameter slightly larger than the outer diameter of the holding member 11. Therefore, the reference plate 15 is placed on the road surface 50S with the holding member 11 passing through it. The reference plate 15 in this example is flat and has no front or back. Both the front and back surfaces can be used as the contact portion 151 with respect to the road surface 50S. The surface facing the road surface 50S functions as the contact portion 151.

[0035] The thickness of the reference plate 15 is 5 mm. The height of the upper surface of the reference plate 15 relative to the road surface 50S is 5 mm. If the placement depth of the magnetic marker 3 in the storage hole 58 is appropriate and the tilt of the magnetic marker 3 is sufficiently small, the insertion depth of the holding member 11 is 10 mm, as described above. When the placement of the magnetic marker 3 is appropriate, the position 10 mm from the holding surface 11S coincides with the height of the road surface 50S, and the upper surface of the reference plate 15 coincides with the position 15 mm from the holding surface 11S. As described above, five 1 mm-wide scale lines 118 are provided on the outer surface of the holding member 11 within a range of 13 to 18 mm axially from the holding surface 11S. If the placement of the magnetic marker 3 in the storage hole 58 is appropriate, as shown in Figure 9, some of the scale lines 118 can be seen from the outside, while some of the scale lines 118 are hidden by the reference plate 15 and cannot be seen. That is, the upper surface of the reference plate 15 functions as a reference portion 152 for comparing the height position with the scale lines 118 .

[0036] By using the reference plate 15, an operator can visually check the number and color combination of the scale lines 118 to confirm whether the insertion depth of the holding member 11 is appropriate. In particular, in the configuration of this example, the five scale lines 118 are color-coded so that even an operator with a color vision deficiency can distinguish between the lines by color, just like an operator without a color vision deficiency. With the configuration of this example, whether the insertion depth of the holding member 11 is appropriate can be determined with high accuracy, regardless of whether the operator has a color vision deficiency.

[0037] After the insertion depth of the holding member 11 has been confirmed, the shaft 131 of the detaching member 13 is inserted into the through-hole 110 of the holding member 11. By displacing the detaching member 13 forward in the axial direction relative to the holding member 11 in this manner, the tip of the shaft 131 is pressed against the magnetic marker 3 (Figure 10). Here, the length of the shaft 131 is 40 mm, which is longer than the length of the holding member 11, which is 30 mm in the axial direction. When the tip of the shaft 131 is pressed against the magnetic marker 3, 10 mm of the shaft 131 remains at the rear end of the holding member 11.

[0038] By using the remaining portion at the rear end of the shaft 131, the holding member 11 can be pulled back in the axial direction while keeping the tip of the shaft 131 of the detaching member 13 pressed against the magnetic marker 3 (see Figure 11). By detaching the holding member 11 in the axial direction while pressing the magnetic marker 3 against the bottom surface of the storage hole 58 with the detaching member 13, the magnetic coupling with the holding member 11 can be released without affecting the posture of the magnetic marker 3.

[0039] The holding member 11 can be displaced backward in the axial direction without interfering with the separating member 13 until it abuts against the flange portion 133 of the separating member 13. When the holding member 11 abuts against the flange portion 133, the distance between the magnetic marker 3 and the holding member 11 is 10 mm. As long as a distance of 10 mm is maintained, no magnetic force large enough to affect the posture of the magnetic marker 3 in the storage hole 58 is generated between the holding member 11 and the magnetic marker 3.

[0040] After the holding member 11 abuts against the flange portion 133 of the detachment member 13, the holding member 11 can be pulled upward together with the detachment member 13 and removed from the storage hole 58. The detachment member 13 is made of a non-magnetic resin such as nylon, to which the magnetic marker 3 is not attracted. Therefore, the detachment member 13 can be removed from the storage hole 58 without affecting the placement of the magnetic marker 3 in the storage hole 58. By removing the holding member 11 from the storage hole 58 together with the detachment member 13 in this way, the work of placing the magnetic marker 3 in the storage hole 58 can be completed. Thereafter, the storage hole 58 can be backfilled with road repair material 507, completing the installation of the magnetic marker 3.

[0041] As described above, the auxiliary tool 1 of this example is a useful tool for placing magnetic markers 3 in storage holes 58 drilled in the road surface 50S. By using the auxiliary tool 1, highly accurate placement of magnetic markers 3 can be performed efficiently, regardless of the worker's level of skill or whether or not the worker has a color vision disorder.

[0042] While the combination of the holding member 11 and the separating member 13 is an essential component of the auxiliary tool 1, the configuration may not include the reference plate 15. If the magnetic marker 3 is placed using the holding member 11, there is very little risk of the magnetic marker 3 tilting inside the storage hole 58. If the bottom surface of the storage hole 58 is precisely compacted to a depth of 15 mm using the compaction tool 109, there is little need to check the placement depth of the magnetic marker 3. In such a case, there is less need to use the reference plate 15 to measure the insertion depth of the holding member 11.

[0043] In this example, the procedure involves inserting the holding member 11 that holds the magnetic marker 3 into the accommodation hole 58, placing the magnetic marker 3 on its bottom surface, and then inserting the shaft 131 of the separation member 13 into the through-hole 110 of the holding member 11. Alternatively, it is also possible to prepare an auxiliary tool 1 in advance, with the shaft 131 inserted into the through-hole 110 so that the tip surface of the shaft 131 is flush with the holding surface 11S. In this case, the auxiliary tool 1 is inserted into the accommodation hole 58 with the magnetic marker 3 held on the holding surface 11S and the tip surface of the shaft 131 in contact with the magnetic marker 3. For example, as shown in FIG. 12, it is also possible to provide a mechanism that restricts the range of axial advancement and retreat of the separation member 13 relative to the holding member 11 so that the shaft 131 does not protrude from the holding surface 11S.

[0044] In the auxiliary tool 1 of FIG. 12, a groove 132 of a finite length along the axial direction is provided in the shank 131 (separating member 13). A threaded hole 112 is provided in the retaining member 11, penetrating radially and opening onto the inner circumferential surface of the through-hole 110. A hexagonal socket set screw (commonly known as a set screw) 113 is threaded into the threaded hole 112. The tip of the hexagonal socket set screw 113 protrudes from the inner circumferential surface of the through-hole 110 and is housed in the groove 132 of the separating member 13. One end of the formation range of the groove 132 is located at a position corresponding to the hexagonal socket set screw 113 when the tip surface of the shank 131 is flush with the retaining surface 11S (see FIG. 12). The other end of the formation range of the groove 132 is located at a position corresponding to the hexagonal socket set screw 113 when the retaining surface 11S is retracted from the tip surface of the shank 131 (see FIG. 11). The combination of such a finite length groove 132 and hexagon socket set screw 113 realizes a mechanism for restricting the range of axial advancement and retreat of the holding member 11 relative to the separating member 13 .

[0045] This example illustrates a holding member 11 that can magnetically attract the magnetic marker 3 to the holding surface 11S using the magnetic force of the magnetic marker 3. The holding member 11 in this example does not generate magnetic force itself, but is made of a soft magnetic material that can attract a magnet. Alternatively, a holding member made of a permanent magnet may be used. For example, a holding member with a north pole on the holding surface 11S can hold the magnetic marker 3 with the south pole of the magnetic marker 3 facing the holding surface 11S. For example, if installation is specified with the south pole facing upward, the magnetic marker 3 can be installed extremely efficiently using a holding member with a north pole on the holding surface 11S. During installation, it is also possible to selectively use a holding member with a north pole on the holding surface 11S and a holding member with a south pole on the holding surface 11S. In this case, installation of multiple magnetic markers with specified magnetic polarity combinations can be performed efficiently.

[0046] In this example, the holding member 11 is exemplified as one that magnetically attracts and holds the magnetic marker 3, but the method by which the holding member holds the magnetic marker 3 is not limited to magnetic attraction. There are various possible methods for holding the magnetic marker 3, such as a method using the adhesive force of an adhesive material, a method using the adhesive force of an adhesive material, a method using negative pressure, a method using a suction cup, and so on.

[0047] The auxiliary tool 1 of this example has a structure in which a separation member 13 is inserted into a holding member 11. The auxiliary tool 1 may also have a structure in which the separation member 13 is inserted externally into the holding member 11, as shown in Figures 13 and 14. Figure 13 shows the assembled structure, and Figure 14 shows the assembled state. The holding member 11 is composed of a shaft 11B and a body 11A. A large-diameter handle 11C is fixed to the tip of the shaft 11B by a screw 11D. The body 11A is made of carbon steel, which is a soft magnetic material, and its tip surface forms a holding surface 11S that magnetically attracts and holds the magnetic marker 3.

[0048] The detachment member 13 in Figures 13 and 14 is made of a non-magnetic resin such as nylon. The detachment member 13 has a shape similar to an upside-down cylindrical cup with a bottom. A hole 13C is drilled in the bottom 13B to allow the shaft portion 11B of the holding member 11 to pass through. The axial dimension of the internal space of the cylindrical portion 13A of the detachment member 13 is 10 mm longer than the body portion 11A of the holding member 11.

[0049] In the auxiliary tool 1 shown in FIGS. 13 and 14, the handle 11C of the holding member 11 functions as a retainer. Therefore, the holding member 11 and the separating member 13 are integral. The holding member 11 can move axially back and forth relative to the separating member 13 with the shaft 11B penetrating through the hole 13C in the bottom 13B (separating member 13). The range of movement of the holding member 11 ranges from a forward position (position shown in FIG. 14) where the end face of the tubular portion 13A of the separating member 13 is flush with the holding surface 11S, to a backward position where the body 11A abuts against the bottom 13B of the separating member 13. The position shown in FIG. 14 is a position restricted by the handle 11C abutting against the top surface of the separating member 13 (the outer surface of the bottom 13B).

[0050] When placing the magnetic marker 3, the magnetic marker 3 is attracted to the holding surface 11S of the holding member 11, which is positioned in the above-mentioned forward position. When the holding member 11 is positioned in the forward position, the end face of the tubular portion 13A is flush with the holding surface 11S. Therefore, the detachment member 13 (tubular portion 13A) comes into contact with the magnetic marker 3 attracted to the holding surface 11S (the state shown in Figure 14). In this state, the auxiliary tool 1 is inserted into the storage hole 58 to place the magnetic marker 3 on the bottom surface of the storage hole 58. Then, while maintaining the detachment member 13 in contact with the magnetic marker 3, the handle 11C is pulled up, and the holding member 11 is displaced to the above-mentioned retracted position, where the body portion 11A comes into contact with the bottom portion 13B of the detachment member 13. This releases the magnetic coupling between the holding member 11 and the magnetic marker 3. Thereafter, the auxiliary tool 1 is pulled out from the storage hole 58, thereby completing the operation of placing the magnetic marker 3 in the storage hole 58.

[0051] Furthermore, the auxiliary tool 1 shown in FIG. 15 may also be employed. The holding member 11 in this figure is a columnar member having a cross-sectional shape with four circumferential notches 11D. The separation member 13 has four legs 13E corresponding to the notches 11D of the holding member 11 and a top plate 13D that cantilever-supports the four legs 13E. The cross-sectional shape of the auxiliary tool 1, in which the holding member 11 and the separation member 13 are combined so that the legs 13E are positioned in the notches 11D, is a circle with an outer diameter of 30 mm that can be inserted into the storage hole 58. The axial length of the four legs 13E is 10 mm longer than the axial length of the columnar holding member 11. The tips of the legs 13E form a contact surface for the magnetic marker 3 placed on the bottom surface of the storage hole 58.

[0052] FIG. 16 shows an example of an auxiliary tool 1 including a reference plate 15 on which a ruler 15A is erected. The surface of this reference plate 15 opposite to the surface on which the ruler 15A is erected forms a contact portion 151 that comes into contact with the road surface 50S. The holding member 11 shown in the same figure does not have scale lines on its outer peripheral surface. The upper end surface of the holding member 11 serves as a reference portion 152 for comparison with the scale 118 of the ruler 15A, allowing the insertion depth of the holding member 11 to be measured. It is also possible to provide a mark (one location) on the outer peripheral surface of the holding member 11 for comparison with the scale 118 of the ruler 15A.

[0053] FIG. 17 shows an example of a holding member 11 including a bolt 15B, which is an example of a measurement member. Note that a release member is not shown in this figure. An axial groove 11E is formed on the outer peripheral surface of the holding member 11. An L-shaped bolt 15B is held in the groove 11E so that it can advance and retreat along the extension direction. One of the two sides of the L-shape of the bolt 15B extends along the axial direction and is held in the groove 11E so that it can advance and retreat in the axial direction. A scale (not shown) is provided on this side. The other of the two L-shaped sides of the bolt 15B protrudes toward the outer peripheral side of the holding member 11. When the holding member 11 is inserted into the receiving hole 58, the other side forms the ground contact portion 151 and abuts against the road surface 50S ( FIG. 18 ). The bolt 15B is displaced in the axial direction depending on the insertion depth of the holding member 11 into the receiving hole 58. By comparing the upper end surface of holding member 11 with the scale on ruler 15B as reference point 152, it is possible to measure the insertion depth of holding member 11 into accommodation hole 58. It is also possible to provide a mark (in one location) on the outer circumferential surface of holding member 11 for comparison with the scale on ruler 15B.

[0054] Although specific examples of the present invention have been described in detail as examples, these examples merely disclose examples of the technology encompassed by the claims. Needless to say, the scope of the claims should not be interpreted as being limited by the configurations, numerical values, etc. of the specific examples. The claims encompass technologies that are obtained by variously modifying, changing, or appropriately combining the specific examples using publicly known technology and the knowledge of those skilled in the art.

[0055] 1 Auxiliary tools 11 Retaining member 11S holding surface 110 Through hole 118 Scale mark (mark, scale) 13 Separation member 131 Shaft 133 Flange 15 Reference plate (measurement component) 150 Placement hole (placement part) 151 Grounding part 152 Reference site 3 Magnetic Markers 50 track 50S road surface 58 Receiving hole

Claims

1. An auxiliary tool for placing a magnetic marker in a receiving hole drilled in a road surface when installing a magnetic marker that exerts magnetism externally, a columnar holding member having a holding surface for the magnetic marker at an axial end thereof; a release member coupled to the retaining member so as to be axially movable relative to the retaining member; The combination of the holding member and the releasing member may be such that the releasing member is positioned so as to abut against the magnetic marker held on the holding surface, and An auxiliary tool for construction, configured so that the holding member can be retracted axially away from the magnetic marker while the detaching member remains in contact with the magnetic marker.

2. According to claim 1, the holding member has a through hole penetrating in the axial direction, and the separating member is insertable into the through hole and has a shaft portion that is longer in the axial direction than the through hole, The combination of the holding member and the releasing member is configured so that the releasing member can move axially relative to the holding member when the shaft portion is inserted into the through hole.

3. In claim 1 or 2, the holding surface is a surface formed of a soft magnetic material and is configured to magnetically attract and hold the magnetic marker, An auxiliary tool for construction, wherein at least the portion of the detaching member that contacts the magnetic marker is made of a non-magnetic material.

4. 2. The method according to claim 1, further comprising: An auxiliary construction tool configured to measure or confirm the insertion depth of the holding member into the accommodating hole depending on the relative vertical positions of the holding member inserted into the accommodating hole and the measuring member whose ground contact portion is in contact with the road surface.

5. 5. An auxiliary tool for construction according to claim 4, wherein one of the holding member and the measuring member is provided with a mark or scale, and the other includes a reference portion for comparing the relative position in the height direction with the mark or scale.

6. According to claim 4, the measuring member is a flat plate-like member provided with an arrangement portion through which the holding member inserted into the accommodation hole passes, The holding member has marks or scales on its outer circumferential surface, An auxiliary tool for construction that is configured so that the parts of the markings or scales that are invisible from the outside due to the measuring member and the parts that are visible from the outside change depending on the insertion depth of the holding member into the accommodating hole.

7. A construction method for placing a magnetic marker in a receiving hole drilled in a road surface when constructing a magnetic marker that exerts magnetism on the outside, comprising: a columnar holding member having a holding surface for the magnetic marker at an axial end thereof; a release member coupled to the holding member so as to be axially movable relative to the holding member; The holding member is inserted into the receiving hole with the holding surface holding the magnetic marker at the tip end side, A method of installing a magnetic marker, in which the detachment member is kept in contact with the magnetic marker held on the holding surface, and the holding member is retracted axially away from the magnetic marker to remove it from the storage hole.

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