Installation method and installation structure for magnetic markers

Abstract

To provide a method for installing magnetic markers that can shorten the time the road surface needs to be closed during installation, allowing the road surface to be reopened sooner. [Solution] In the construction method for laying a sheet-shaped magnetic marker 1 on a road surface 53, the magnetic marker 1 is placed on the road surface 53 with an adhesive layer 21 made of modified silicone adhesive in between. Then, before the modified silicone adhesive forming the adhesive layer 21 hardens, a load is applied to the construction site 5A while restricting the position of the magnetic marker 1 on the road surface 53 to compact it and make the magnetic marker 1 adhere tightly to the road surface 53.

Description

Technical Field

[0001] The present invention relates to a construction method and a construction structure for laying magnetic markers on a runway.

Background Art

[0002] Conventionally, as an in-site logistics system in factories, warehouses, etc., a system that utilizes magnetic markers laid along a route is known. Vehicles constituting the system are equipped with magnetic sensors for detecting magnetic markers on the road surface. The vehicle is controlled to travel along the magnetic markers while sequentially detecting the magnetic markers, thereby enabling movement along a preset route.

[0003] Patent Document 1 below describes a system in which sheet-shaped magnetic markers are attached to the road surface. In the mode of attaching and laying sheet-shaped magnetic markers on the road surface, since there is no need to embed the magnetic markers, the construction cost can be kept low. Also, in the case of sheet-shaped magnetic markers attached to the road surface, removal is relatively easy, so it is possible to respond relatively easily to specification changes such as route changes.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, the above system has the following problems. That is, when constructing the magnetic markers, it is necessary to close the runway, and if the time until the road surface can be opened becomes long, smooth logistics and pedestrian flow will be hindered.

[0006] This invention has been made in view of the aforementioned conventional problems, and aims to provide a method and structure for installing magnetic markers that can shorten the time required to close the road surface when installing magnetic markers, and allow the road surface to be opened earlier. [Means for solving the problem]

[0007] One aspect of the present invention is a construction method for laying a sheet-shaped magnetic marker on a road surface, The process involves placing the magnetic marker at the construction site where the magnetic marker is to be laid, with a first adhesive layer made of a first adhesive in between. The process includes the step of applying a load to the construction site where the magnetic marker is placed, in order to make the magnetic marker, which is placed at the construction site via the first adhesive layer, adhere to the road surface, The method for installing magnetic markers involves applying a load to the installation site while regulating the position of the magnetic marker on the road surface, after the step of placing the magnetic marker and before the first adhesive exerts its adhesive force.

[0008] One aspect of the present invention is a construction structure for arranging a sheet-shaped magnetic marker on a road surface, The magnetic marker is adhered to the road surface with at least a portion of it covered by a sheet-like or tape-like protective member. A portion of the protective member extends beyond the outer circumference of the magnetic marker and faces the road surface. The magnetic marker is adhered to the road surface by a first adhesive, In the construction structure of the magnetic marker, the portion of the protective member that protrudes outward from the outer circumference of the magnetic marker and faces the road surface is adhered to the road surface with a second adhesive that takes less time to exert adhesive strength than the first adhesive. [Effects of the Invention]

[0009] In the magnetic marker installation method according to the present invention, the position of the magnetic marker is restricted by a protective member, and a load is applied to the magnetic marker to make it adhere to the road surface. Generally, if a load is applied to the magnetic marker before the adhesive has developed its adhesive strength, there is a high possibility that the position of the magnetic marker on the road surface will change. By restricting the position of the magnetic marker with a protective member as in the installation method according to the present invention, displacement of the magnetic marker can be prevented even before the adhesive has hardened.

[0010] In the magnetic marker installation structure according to the present invention, the magnetic marker is adhered to the road surface with at least a portion of it covered by a protective member. The adhesive used to adhere the magnetic marker to the road surface and the adhesive used to adhere the protective member to the road surface are different adhesives, and the adhesive for the protective member requires a shorter time to exert its adhesive strength. By using a protective member that adheres to the road surface early, it is possible to reliably prevent displacement of the magnetic marker that may occur before the adhesive for the magnetic marker exerts its adhesive strength.

[0011] Here, misalignment of magnetic markers can occur when determining the installation location of magnetic markers or during the installation work of laying magnetic markers at the installation location. The present invention is for reducing misalignment of magnetic markers during installation work and for laying magnetic markers with high positional accuracy. According to the installation method of the present invention, by applying a load to the magnetic markers while regulating their position on the road surface, misalignment of magnetic markers that may occur during installation work can be reliably avoided. Furthermore, according to the installation structure of the present invention, by using an adhesive that requires a short time to exert adhesive strength to bond a protective member to the road surface, misalignment of magnetic markers that may occur before the adhesive strength is exerted can be reliably prevented. [Brief explanation of the drawing]

[0012] [Figure 1] An explanatory diagram showing how a vehicle travels along a path where magnetic markers are laid in Example 1. [Figure 2] Diagram illustrating the installation structure of the magnetic marker in Example 1. [Figure 3]Cross-sectional view showing the construction structure of magnetic markers laid on the road surface in Example 1. [Figure 4] Flow chart showing the construction procedure of magnetic markers in Example 1. [Figure 5] Perspective view showing the adhesive layer formed on the road surface in Example 1. [Figure 6] Explanatory drawing showing the state where magnetic markers are arranged on the inner peripheral adhesive layer in Example 1. [Figure 7] Explanatory drawing showing the state where the protective sheet covers the magnetic markers in Example 1. [Figure 8] Explanatory drawing of the operation of compacting the magnetic markers in Example 1. [Figure 9] Drawing showing the construction state of another magnetic marker No. 1 in Example 1. [Figure 10] Drawing showing the construction state of another magnetic marker No. 2 in Example 1. [Figure 11] In Example 2. Explanatory drawing of the operation using the first hand tamper. [Figure 12] In Example 2. Explanatory drawing of the operation using the second hand tamper. [Figure 13] In Example 2. Drawing showing the surface of another plate No. 1 of the hand tamper. [Figure 14] In Example 2. Side view of another plate No. 2 of the hand tamper. [Figure 15] In Example 2. Explanatory drawing of the operation using the third hand tamper.

Mode for Carrying Out the Invention

[0013] In the construction method according to the present invention, "before the first adhesive exhibits adhesive force" means before the so-called set time has elapsed. In the construction method according to the present invention, even before the first adhesive exhibits adhesive force, a load can be applied to the construction location where the magnetic markers are arranged through the first adhesive layer, and the magnetic markers can be made to adhere closely to the road surface.

[0014] In the construction method according to the present invention, it is preferable to apply the first adhesive to the road surface to form the first adhesive layer, but it is also possible to pre-apply the first adhesive layer to the back surface of the magnetic marker placed on the road surface. Furthermore, as a method of applying load, there are methods using devices and tools such as compactors, rammers, and hand tampers used for compacting the ground.

[0015] (Example 1) This example concerns the construction method and structure of a magnetic marker 1 for enabling automated driving of transport vehicles 5 and improving the efficiency of in-plant logistics in factories and other facilities. This will be explained with reference to Figures 1 to 10.

[0016] As shown in Figure 1, the magnetic marker 1 is laid along a path 530 on which a transport vehicle 5 (hereinafter referred to as vehicle 5) travels. The path 530 is set on a walkway paved with, for example, asphalt or concrete. The magnetic marker 1 is in the form of individual sheets and is laid on the road surface 53 that forms the surface of the walkway by being attached with an adhesive.

[0017] Magnetic markers 1 laid on the road surface 53 can be detected, for example, by a magnetic sensor unit 51 attached to a vehicle 5. The magnetic sensor unit 51 is a rod-shaped unit, with multiple magnetic sensors (not shown) of the same specifications arranged along its longitudinal direction. This magnetic sensor unit 51 is attached to the bottom surface of the vehicle 5 in a manner aligned with the vehicle width direction.

[0018] Multiple magnetic measurements output by multiple magnetic sensors indicate the magnetic intensity distribution in the vehicle width direction. Based on the magnetic intensity distribution in the vehicle width direction, the position of the magnetic marker 1 relative to the vehicle 5 can be determined in the vehicle width direction. For example, by steering the vehicle 5 so that the lateral displacement of the vehicle 5 relative to the magnetic marker 1 approaches zero, it becomes possible to move the vehicle 5 along the path 530 on which the magnetic marker 1 is laid.

[0019] The magnetic marker 1 in this example (Figure 2) is a flat, circular magnetic sheet with a diameter of 60 mm and a thickness of 1.5 mm. The magnetic marker 1 is manufactured, for example, by punching out a large sheet made of anisotropic ferrite rubber magnet. Anisotropic ferrite rubber magnet is a permanent magnet in which magnetic powder, which is iron oxide powder, is dispersed in a rubber base material. It is also possible to provide a coating layer of resin material on the front and back surfaces of the magnetic marker 1.

[0020] In this example, as will be explained in detail later, the efficiency of the installation work of the magnetic marker 1 is improved by using a protective sheet 3 (Figure 2). The protective sheet 3 is a circular sheet with a diameter of 120 mm and a thickness of approximately 1 mm, with a polyester film as the base sheet and an anti-slip layer on the surface. In this example, as shown in Figure 3, the magnetic marker 1 is placed on the road surface 53 covered by a protective sheet 3 that is larger than the magnetic marker 1. The protective sheet 3 is an example of a sheet-like protective member that is attached to at least a part of the surface of the magnetic marker 1 and extends beyond the outer circumference of the magnetic marker 1.

[0021] As shown in the construction structure of Figures 2 and 3, the magnetic marker 1 and the protective sheet 3 are bonded to the road surface 53 (construction site 5A) using different adhesives. The magnetic marker 1 is bonded to the road surface 53 via a first adhesive layer 21 made of a modified silicone adhesive, which is an example of a first adhesive. On the other hand, the protective sheet 3 is bonded to the road surface 53 via a second adhesive layer 22 made of a chloroprene adhesive, which is an example of a second adhesive. More precisely, the portion of the retaining sheet 3 that protrudes outward on the outer circumference side of the magnetic marker 1 and does not face the magnetic marker 1 is bonded to the road surface 53 via the second adhesive layer 22.

[0022] Next, the installation method for the magnetic marker 1 will be described. The procedure for installing the magnetic marker 1 is as shown in the flowchart in Figure 4. The installation method in this example includes the steps of applying adhesive to the road surface 53 (S1), placing the magnetic marker 1 on the road surface 53 (S2), attaching a protective sheet 3 to cover the entire magnetic marker 1 (S4), and compacting by applying a load to the installation site 5A (S5).

[0023] In the construction method of this example (Figure 4), step S2 may be performed immediately after step S1, but for step S4, it is necessary to wait until a predetermined time has elapsed since the completion of step S1 (S3: NO). This predetermined time, which is the condition for performing step S4, is the tack-free time of the chloroprene-based adhesive that forms the second adhesive layer 22 (see Figure 3), that is, the touch-dry time when the surface of the adhesive layer 22 no longer strings when touched with a finger. Step S4, in which the protective sheet 3 is attached to the road surface 53, is performed after waiting for the tack-free time of the chloroprene-based adhesive that forms the second adhesive layer 22 to elapse (S3: YES → S4). Note that if the protective sheet 3 is attached before the tack-free time of the chloroprene-based adhesive has elapsed, there is a risk of misalignment of the protective sheet 3 or a decrease in adhesive strength.

[0024] After the protective sheet 3 is attached to the road surface 53, a compaction process S5 is carried out by applying a load to the construction site 5A. Compaction in process S5 allows the magnetic marker 1 to adhere tightly to the road surface 53, enabling the subsequent opening of the road surface 53 to be achieved sooner (S6).

[0025] Furthermore, the step S5 in which a load is applied to the construction site 5A should be performed after the step S1 in which the adhesive layer 22 is provided, by waiting for the set time of the chloroprene adhesive, that is, the time required for the adhesive to exert its adhesive strength after surface drying. If the set time of the chloroprene adhesive forming the adhesive layer 22 has elapsed, the adhesion of the protective sheet 3 to the road surface 53 can reliably prevent the displacement of the magnetic marker 1 that was laminated on the adhesive layer 21 before the set time had elapsed.

[0026] In this example of construction method, the magnetic marker 1 is covered and cured by the protective sheet 3, so that after the completion of process S5, the road surface 53 can be opened quickly (S6), and the route 530 can be used. The contents of processes S1, S2, S4, and S5 will be explained below with reference to the diagram.

[0027] Step S1 (Figure 4) is the process of applying adhesive layers 21 and 22 to the road surface 53. In this step S1, two types of adhesive are used to coat the inner and outer regions of a circular area with a diameter of 120 mm, as shown in Figure 5. The inner region is a circular area with a diameter of 60 mm. The outer region is an annular area with a hole diameter of 60 mm and an outer diameter of 120 mm that surrounds the inner region.

[0028] A first adhesive layer 21, which is a coating layer of a modified silicone adhesive, an example of a first adhesive, is formed in the circular inner region. This first adhesive layer 21 is an adhesive layer for adhering the magnetic marker 1 to the road surface 53. A second adhesive layer 22, which is a coating layer of a chloroprene adhesive, an example of a second adhesive, is formed in the annular outer region. This second adhesive layer 22 is an adhesive layer for adhering the protective sheet 3 to the road surface 53.

[0029] Here, the modified silicone adhesive has high viscosity and forms a relatively thick (first) adhesive layer 21. This adhesive layer 21 absorbs the irregularities of the road surface 53 and presents a smooth surface. On the other hand, the chloroprene adhesive has low viscosity and forms a relatively thin (second) adhesive layer 22. This adhesive layer 22 cannot adequately absorb the irregularities of the road surface 53. The surface of the adhesive layer 22 becomes an uneven surface, and therefore, there is a risk that sufficient adhesion to the protective sheet 3, which is the object to be bonded, cannot be ensured.

[0030] When comparing modified silicone adhesives and chloroprene adhesives, modified silicone adhesives are superior in terms of adhesion to the magnetic marker 1 or protective sheet 3, as they form a smooth adhesive layer. On the other hand, chloroprene adhesives are significantly superior in terms of curing (drying) time, such as tack-free time, and the time required to achieve adhesive strength (set time). The tack-free time of modified silicone adhesives is several hours, while that of chloroprene adhesives is only about 1-2 minutes. Furthermore, the set time of modified silicone adhesives is approximately 12 hours, while that of chloroprene adhesives is only about 5 minutes.

[0031] Step S2 (Figure 4) is the step of placing magnetic markers 1 on the road surface 53. In step S2, as shown in Figure 6, sheet-shaped magnetic markers 1 are laminated onto the first adhesive layer 21. In normal bonding work, it is common to wait for the adhesive layer 21 to become tack-free, meaning that it no longer strings when touched, before bringing the object to be bonded into contact with the adhesive surface. On the other hand, with the construction work in this example that utilizes the protective sheet 3, after performing step S1, step S2 can be performed immediately without waiting for the tack-free time of the modified silicone adhesive forming the first adhesive layer 21 to elapse.

[0032] Step S4 (Figure 4) is the process of attaching the protective sheet 3 to the road surface 53 so as to cover the magnetic marker 1, as shown in Figure 7. As described above, it is preferable to perform this step S4 after step S1 has been completed and after waiting for the surface of the second adhesive layer 22 to transition to a tack-free state where it no longer strings when touched with a finger. As described above, the tack-free time of the chloroprene-based adhesive forming the adhesive layer 22 is about 2 minutes.

[0033] The protective sheet 3 may also be a sheet having an adhesive layer. If the protective sheet 3 has adhesive properties, it can adhere to the surface of the magnetic marker 1. If the protective sheet has an adhesive layer, it may be possible to omit the adhesive layer 22 for adhering the protective sheet to the road surface 53. Also, if the protective sheet has an adhesive layer, there is no need to wait for tack-free time when attaching it to the road surface 53. In the case of the protective sheet 3 in this example which does not have adhesive properties, it is not essential, but it is also possible to apply a chloroprene-based adhesive to the surface of the magnetic marker 1. If an adhesive is applied to the surface of the magnetic marker 1, the protective sheet 3 can be adhered to the surface of the magnetic marker 1.

[0034] Step S5 is the process of compacting the construction site 5A and making the magnetic marker 1 adhere to the road surface 53. Step S5 can be carried out using a compactor 6 (Figure 8), which is used for compacting the ground, for example. With the compactor 6, the construction site 5A can be compacted by compaction through repeated application of impact loads from above the protective sheet 3.

[0035] Furthermore, it is preferable to perform step S5 after waiting for the set time, which is the time required for the chloroprene adhesive used to bond the protective sheet 3 to the road surface 53, to develop its adhesive strength. Once the set time has elapsed, the adhesion of the protective sheet 3 to the road surface 53 is more reliable, thus reliably preventing displacement of the magnetic marker 1 that may occur when a load is applied to the work area 5A. As mentioned above, the set time for the chloroprene adhesive forming the adhesive layer 22 is approximately 5 minutes.

[0036] In the state where the magnetic marker 1 is simply laminated on the (first) adhesive layer 21 by step S2, there is a possibility that air may get trapped between the adhesive layer 21 and the magnetic marker 1, or between the adhesive layer 21 and the road surface 53, creating gaps. The compaction step S5 expels the air from between the adhesive layer 21 and the magnetic marker 1, and between the adhesive layer 21 and the road surface 53, eliminating the gaps and allowing the magnetic marker 1 to adhere tightly to the road surface 53.

[0037] Here, if the protective sheet 3 is not used and the position of the magnetic marker 1 on the road surface 53 is not restricted, when performing step S5, it is necessary to wait for the set time, which is the time required for the modified silicone adhesive that is the adhesive to the magnetic marker 1, to exert its adhesive strength. As described above, in the case of the modified silicone adhesive that forms the adhesive layer 21, the set time is approximately 12 hours. Therefore, if the protective sheet 3 is not used, step S5 cannot be performed until 12 hours have elapsed after the adhesive layer of the modified silicone adhesive has been applied to the road surface 53.

[0038] In contrast, in step S5 of this example, the construction site 5A is compacted with the magnetic marker 1 covered by the protective sheet 3. The protective sheet 3 is bonded to the road surface 53 with a chloroprene-based adhesive around its entire circumference. The protective sheet 3, bonded to the road surface 53 with a chloroprene-based adhesive after the set time has elapsed, can reliably prevent displacement of the magnetic marker 1 on the road surface 53 that may occur when a load is repeatedly applied to it. Therefore, in the construction method of this example, step S5 can be carried out without waiting for the set time or tack-free time of the modified silicone adhesive to which the magnetic marker 1 is bonded.

[0039] In the installation method for the magnetic marker 1 in this example, configured as described above, the position of the magnetic marker 1, which is placed on the road surface 53 via an adhesive layer 21 of modified silicone adhesive, is restricted by a protective sheet 3 while the installation site 5A is compacted. If the protective sheet 3 is not used, there is a high possibility that the position of the magnetic marker 1 will shift on the road surface 53 if a load is applied to the installation site 5A before the magnetic marker 1 is sufficiently adhered. In contrast, with the installation method in this example, the position of the magnetic marker 1 can be restricted by the protective sheet 3, so there is less risk of the magnetic marker 1 shifting when a load is applied to the installation site 5A.

[0040] In this example, the adhesive used to bond the magnetic marker 1 to the road surface 53 is different from the adhesive used to bond the protective sheet 3 to the road surface 53. The adhesive used for the protective sheet 3 is a chloroprene-based adhesive, while the adhesive used for the magnetic marker 1 is a modified silicone-based adhesive. The modified silicone-based adhesive used to bond the magnetic marker 1 has the advantage of higher adhesion and superior bonding strength over a long period of time compared to the chloroprene-based adhesive used to bond the protective sheet 3. On the other hand, the modified silicone-based adhesive has the disadvantage of significantly longer tack-free time and set time compared to the chloroprene-based adhesive, resulting in a longer installation time.

[0041] In this example, a combination of a first adhesive with high adhesion for the magnetic marker 1 and a second adhesive with a short set time for the protective sheet 3 is utilized. The protective sheet 3, which is bonded first, is used to control the position of the magnetic marker 1 on the road surface 53 while compacting the construction site 5A. Even if the adhesive for the magnetic marker 1 has not yet exerted its adhesive strength during compaction of the construction site 5A, the protective sheet 3, which is bonded first, can reliably prevent the magnetic marker 1 from shifting position on the road surface 53.

[0042] With the magnetic marker 1 covered by the protective sheet 3 in this manner, compaction of the work area 5A is possible even before the adhesive of the magnetic marker 1 has exerted its adhesive strength, allowing for early opening of the road surface. After the set time of the chloroprene-based adhesive forming the adhesive layer 22 has elapsed, the protective sheet 3 can adhere to the road surface 53 even before it has fully cured, thus reducing the risk of construction defects occurring when the road surface 53 is opened.

[0043] In this example, a large, circular protective sheet 3 (see Figure 2) capable of covering the entire magnetic marker 1 is used. It is not essential that the protective sheet 3 covers the entire magnetic marker 1; it is sufficient if it can regulate the position of the magnetic marker 1 on the road surface 53. For example, a tape-like protective tape 31 (Figures 9 and 10) may be used as a protective member to regulate the position of the magnetic marker 1.

[0044] As shown in Figure 9, two protective tapes 31 may be attached in an X shape so as to intersect on the magnetic marker 1, or as shown in Figure 10, one protective tape 31 may be attached along the diameter of the magnetic marker 1. The protective tape 31 in Figures 9 and 10 is an example of a tape-shaped protective member. The protective tape 31 is attached to at least a part of the surface of the magnetic marker 1, and the protruding portion 33 that extends outward from the outer circumference of the magnetic marker 1 is attached to the road surface 53.

[0045] Furthermore, as the first adhesive for bonding the magnetic marker 1, an adhesive that can absorb the unevenness of the road surface 53 and form a smooth surface is preferred. In addition to the modified silicone adhesive exemplified, polyurethane-based adhesives, epoxy-based adhesives, and the like can be used as the first adhesive. Furthermore, as the second adhesive for bonding the protective sheet 3, an adhesive with the shortest possible curing time is preferred. In addition to the chloroprene-based adhesive exemplified, butyl-based adhesives, nitrile rubber-based adhesives, and the like can be used as such adhesives.

[0046] In this example, a compactor 6, which is used for compacting the ground, is used to ensure that the magnetic marker 1 is in close contact with the road surface 53. Alternatively, a rammer or tamper could be used instead of the compactor 6.

[0047] In this example, as an example of a protective member, protective sheet 3 is shown as a protective sheet with a polyester film as the base sheet and an anti-slip layer on the surface, but the anti-slip layer may be omitted. Instead of polyester film, a protective sheet with polyethylene film as the base sheet may also be used. A protective sheet made by laminating two or more types of films may also be used.

[0048] (Example 2) This example differs from the installation method in Example 1 in that it describes an installation method for magnetic markers that does not use a protective sheet. This will be explained with reference to Figures 11 to 15. Note that these figures are stylized to prioritize the explanation of function over actual dimensions.

[0049] This example shows a configuration that restricts the position of the magnetic marker 1 on the road surface 53 without using a protective sheet when performing the compaction process (process S5 in Figure 4) in which a load is applied to the installation site 5A of the magnetic marker 1.

[0050] In this example, the hand tamper 7 shown in Figures 11 to 15 is used for compaction work, which involves repeatedly applying load to the installation site 5A of the magnetic marker 1. The configuration of each hand tamper 7 and the work performed by each hand tamper 7 are described below.

[0051] Figure 11 shows a hand tamper with a handle 71 having a handle 710 at its rear end and a compaction plate 73 attached to the tip of the handle. This hand tamper 7 includes an outer cylinder 75 through which the plate 73 moves back and forth. The outer cylinder 75 is a bottomed cylinder, and a hole 750 is provided at the bottom for inserting the handle 71 through it. The inner diameter of the outer cylinder 75 is slightly larger than the diameter of the magnetic marker 1 (60 mm), allowing the magnetic marker 1 to be housed inside the outer cylinder 75 with minimal gaps. On the other hand, the plate 73 has a diameter equal to the diameter of the magnetic marker 1 (60 mm). The outer cylinder 75 is an example of a guide member having an internal space (an example of a housing) capable of housing a sheet-shaped magnetic marker 1.

[0052] After the magnetic marker 1 is laminated onto the adhesive layer 21 made of modified silicone adhesive, the open end of the outer cylinder 75 is pressed against the road surface 53 so that the magnetic marker 1 can be housed inside. Then, while maintaining this position of the outer cylinder 75 pressed against the road surface 53, the handle 710 is moved up and down. This allows a load to be repeatedly applied to the magnetic marker 1 from the tamping surface 730 that forms the surface of the plate 73, thereby compacting the construction area 5A. At this time, since the inner circumferential surface of the outer cylinder 75 faces the outer circumferential side surface of the magnetic marker 1 with little gap around its entire circumference, there is little risk of the magnetic marker 1 shifting position on the road surface 53.

[0053] Figure 12 shows an example of using a sliding hand tamper 7. This sliding hand tamper 7 consists of a plate 73 with a cylindrical sleeve 738 erected on the back side of the tamping surface 730, and a handle 71 with a handle 710 at its rear end. The length of the handle 71, excluding the handle 710, is set so that it touches the bottom of the sleeve 738. The handle 71, including the handle 710, has the mass (weight) necessary for compaction.

[0054] By holding the plate 73 pressed against the work area 5A and moving the handle 710 up and down, the tip of the handle 71 can be repeatedly brought to the bottom, thereby repeatedly applying a load from the tamping surface 730 to the work area 5A. By holding the plate 73 pressed against the work area 5A, the friction between the tamping surface 730 and the surface of the magnetic marker 1 can regulate the position of the magnetic marker 1 on the road surface 53, thereby preventing displacement of the magnetic marker 1 on the road surface 53 while compacting the work area 5A. The plate 73 in Figure 12 is an example of a pressing member that presses against at least a portion of the surface of the sheet-like magnetic marker 1.

[0055] Figure 13 shows an example of a slide-type hand tamper from Figure 12, in which a recess 731 is provided on the tamping surface 730 of the plate 73, serving as an example of a housing for the magnetic marker 1. When the handle 710 (see Figure 12) is moved up and down with the magnetic marker 1 housed in the recess 731, the construction site 5A can be compacted while preventing displacement of the magnetic marker 1 with even greater certainty. The recess 731 only needs to prevent displacement of the magnetic marker 1, and its depth should be less than or equal to the thickness of the magnetic marker 1. The plate 73 in Figure 13 is an example of a guide member equipped with a housing (recess 731) formed to accommodate a sheet-like magnetic marker 1 with minimal gaps.

[0056] Figure 14 shows an example in which a positioning pin 733 is provided on the tamping surface 730 of the plate 73, based on the sliding hand tamper of Figure 12. When the plate 73 is pressed against the work area 5A, the positioning pin 733 penetrates the magnetic marker 1 and is embedded in the road surface 53. By embedding the positioning pin 733 into the magnetic marker 1 in this way, displacement of the magnetic marker 1 can be prevented with high reliability.

[0057] If there is only one positioning pin 733 on the tamping surface 730, it is preferable to position the positioning pin 733 at a location corresponding to the center of the circular magnetic marker 1. By inserting the positioning pin 733 into the center of the magnetic marker 1, it is possible to reliably restrict the displacement of the magnetic marker 1 on the road surface 53 while allowing the rotation of the magnetic marker 1. If there are two or three positioning pins 733 on the tamping surface 730, the positions where these positioning pins 733 penetrate the magnetic marker 1 are arbitrary. With a combination of multiple positioning pins 733, both the rotation and displacement of the magnetic marker 1 can be restricted.

[0058] Figure 15 shows an example of a hand tamper 7, which includes a push rod 77 with a handle 770 at its rear end and a slider 78 externally fitted to the push rod 77. The slider 78 is movable up and down while externally fitted to the push rod 77. The slider 78 is a component with a small-diameter columnar grip portion 782 and a large-diameter plate 781 at its end. The surface of the plate 781 forms the tamping surface 780. The grip portion 782 of the slider 78 is configured to be easy for the operator to grasp.

[0059] By pressing a push rod 77, which is an example of a pressing member, against the surface of the magnetic marker 1, the position of the magnetic marker 1 on the road surface 53 can be controlled. By moving the slider 78 up and down while maintaining this pressing state, a load can be repeatedly applied to the work area 5A by the tamping surface 780, and the magnetic marker 1 can be made to adhere tightly to the road surface 53.

[0060] The other components and effects are the same as in Example 1.

[0061] Although specific examples of the present invention have been described in detail as shown in the examples above, these examples only disclose an example of the technology covered by the claims. Needless to say, the claims should not be interpreted restrictively based on the configuration or numerical values ​​of the specific examples. The claims encompass technologies obtained by various modifications, changes, or combinations of the above examples using prior art or the knowledge of those skilled in the art. [Explanation of Symbols]

[0062] 1 Magnetic marker 21 First adhesive layer 22 Second adhesive layer 3. Protective sheet (protective material) 31 Protective tape (protective material) 33. Protruding part 5. Vehicles (transport vehicles) 5A Construction location 53 Road surface 530 routes 6 Compactor 7 Hand Tamper 71 patterns 73, 781 Plates (guide members, pressing members) 730, 780 tamping surface 731 Recess (storage area) 733 Positioning pin 75 Outer cylinder (guide member) 77 Push rod (pressing member)

Claims

1. A construction method for laying sheet-shaped magnetic markers on a road surface, The process involves placing the magnetic marker at the construction site where the magnetic marker is to be laid, with a first adhesive layer made of a first adhesive interposed therebetween; The process includes the step of applying a load to the construction site where the magnetic marker is placed, in order to make the magnetic marker, which is placed at the construction site via the first adhesive layer, adhere to the road surface, A method for installing magnetic markers, wherein in the step of applying the load, after the step of placing the magnetic markers and before the first adhesive exerts its adhesive force, the load is applied to the installation site while regulating the position of the magnetic markers on the road surface.

2. Claim 1 includes the step of regulating the position of the magnetic marker on the road surface by attaching a sheet-like or tape-like protective member to the road surface, which is attached to at least a portion of the surface of the sheet-like magnetic marker and extends beyond the outer circumference of the magnetic marker, A method for installing a magnetic marker, comprising performing a step to restrict the position before performing the step of applying the aforementioned load.

3. In claim 2, the protective member is a sheet-like protective member that is larger than the sheet-like magnetic marker, A method for installing a magnetic marker, wherein in the step of regulating the position, the sheet-like protective member is attached to the road surface over the entire circumference of the magnetic marker, so as to extend beyond the outer circumference of the magnetic marker.

4. In claim 2 or 3, the protective member is attached to the road surface by adhesion with a second adhesive, A method for installing a magnetic marker, wherein the second adhesive is an adhesive that takes less time to exert adhesive strength than the first adhesive.

5. A method for applying a magnetic marker, wherein the first adhesive is a modified silicone-based adhesive, and the second adhesive is a chloroprene-based or butyl-based adhesive, according to claim 4.

6. In claim 1, in the step of applying the load, a guide member having a housing portion formed to accommodate the sheet-like magnetic marker is used, and the position of the magnetic marker on the road surface is restricted by pressing the guide member against the road surface so that the magnetic marker fits into the housing portion, By using a pressing member that presses at least a portion of the surface of the sheet-like magnetic marker, the position of the magnetic marker on the road surface is restricted by pressing the magnetic marker against the road surface with the pressing member, or, A method for installing magnetic markers, comprising using a positioning pin that can be driven into the road surface, and inserting the positioning pin into the road surface so as to penetrate the magnetic marker placed on the road surface, thereby regulating the position of the magnetic marker on the road surface.

7. A construction structure for installing sheet-shaped magnetic markers on the road surface, The magnetic marker is adhered to the road surface with at least a portion of it covered by a sheet-like or tape-like protective member. A portion of the protective member extends beyond the outer circumference of the magnetic marker and faces the road surface. The magnetic marker is adhered to the road surface by a first adhesive, The construction structure for a magnetic marker, wherein the portion of the protective member that protrudes outward from the outer circumference of the magnetic marker and faces the road surface is adhered to the road surface with a second adhesive that takes less time to exert adhesive strength than the first adhesive.

8. In claim 7, the protective member is a sheet-like protective member that is larger than the sheet-like magnetic marker, The aforementioned protruding portion is formed around the entire circumference of the magnetic marker, in this construction structure for a magnetic marker.

9. A construction structure for a magnetic marker, according to claim 7 or 8, wherein the first adhesive is a modified silicone-based adhesive, and the second adhesive is a chloroprene-based or butyl-based adhesive.

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