Sensor device and fitting method

Abstract

To easily fit a sensor device to a structure.SOLUTION: A sensor device comprises: a first base part and a second base part that are fixed to a structure; and a sensor body which is attached to the first base part and the second base part, in order to measure displacement in a first direction of the structure. The sensor body includes a first sensor part and a second sensor part that are capable of relative movement linearly. The first sensor part is attached to the first base part fixed to the structure. The second sensor part is attached to the second base part fixed to the structure. The first sensor part has a first projection part which is provided on a first attachment face contacted by the first base part, and which extends linearly in a relative movement direction. The first base part includes a first guide part which is formed on a first underside contacted by the first sensor part, is capable of moving the first projection part in the first direction, and regulates movement of the first projection part in a direction that is parallel to the first underside and crosses the first direction.SELECTED DRAWING: Figure 13

Description

[Technical Field]

[0001] The present invention relates to a sensor device and an installation method. [Background technology]

[0002] For example, a sensor device is known that measures minute displacements, such as expansion and contraction, between two points on a structure such as a bridge. The sensor device detects displacements of the structure while attached to the structure.

[0003] A sensor device that measures the amount of expansion and contraction between two points on a structure has a sensor body attached to the structure via two base parts. When attaching the sensor device to a structure, first, the two base parts are attached to an auxiliary jig, then the two base parts are attached to the structure with adhesive while still attached to the auxiliary jig, then only the auxiliary jig is removed, and then the sensor body is attached to the two base parts attached to the structure with bolts or the like.

[0004] Patent Document 1 describes a sensor device that can be attached to a structure such as a bridge via an auxiliary jig. Patent Document 2 describes the structure of an adhesive bonding surface. Patent Document 3 describes a method for adhesively fixing an object to a concrete surface or the like. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2023-142966 [Patent Document 2] Japanese Patent Application Laid-Open No. 2005-139276 [Patent Document 3] Japanese Patent Application Publication No. 9-144370 Summary of the Invention [Problem to be solved by the invention]

[0006] When the structure is a bridge, the sensor device is attached from the underside of the bridge deck. Therefore, when attaching the sensor main body to the two base parts, the sensor main body is in a blind spot, making it difficult for the worker to align the bolt holes in the sensor main body with the bolt holes in the base parts, resulting in poor work efficiency.

[0007] The present invention has been made in view of the above, and has an object to provide a sensor device and an attachment method that can be easily attached to a structure. [Means for solving the problem]

[0008] In order to solve the above-mentioned problems and achieve the object, a sensor device according to the present invention includes a first base portion and a second base portion fixed to a structure at a predetermined first distance in a first direction, and a sensor main body attached to the first base portion and the second base portion and measuring displacement of the structure in the first direction. The sensor main body includes a first sensor portion and a second sensor portion that are linearly movable relative to each other, and a sensor that detects displacement in a relative movement direction in which the first sensor portion and the second sensor portion move relative to each other. The first sensor portion is attached to the first base portion fixed to the structure. The second sensor portion is attached to the second base portion fixed to the structure. The first sensor portion and the second sensor portion are attached to the first base portion and the second base portion so that the relative movement direction is parallel to the first direction. The first sensor portion is provided on a first mounting surface that contacts the first base portion and has a first protrusion that extends linearly in the relative movement direction. The first base portion has a first guide portion formed on a first lower surface with which the first sensor portion comes into contact, allowing the first protrusion portion to move in the first direction, and restricting movement of the first protrusion portion in a direction parallel to the first lower surface and perpendicular to the first direction. [Effects of the Invention]

[0009] According to the present invention, it can be easily attached to a structure. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram showing a sensor device attached to a bridge. [Figure 2] FIG. 2 is a view of the sensor device attached to the concrete surface as seen from the y direction. [Figure 3] FIG. 3 is a view of the sensor device attached to the concrete surface as seen from the z direction. [Figure 4] FIG. 4 is a flowchart showing the flow of a method for attaching a sensor device to a concrete surface. [Figure 5] FIG. 5 is a diagram for explaining the contents of the work in the preparation step (S11). [Figure 6] FIG. 6 is a diagram for explaining the details of the work in the bonding step (S12-1). [Figure 7] FIG. 7 is a diagram for explaining the contents of the hardening step (S12-2). [Figure 8] FIG. 8 is a diagram for explaining the details of the work in the fixing step (S12) using anchor bolts. [Figure 9] FIG. 9 is a diagram for explaining the contents of the work in the removal step (S13). [Figure 10] FIG. 10 is a diagram for explaining the contents of the work of arranging the sensor main body 14 in the mounting step (S14). [Figure 11] FIG. 11 is a diagram for explaining the details of the screw fastening operation of the sensor main body 14 in the mounting step (S14). [Figure 12] FIG. 12 is a perspective view showing the first base portion and the second base portion at a position fixed to a concrete surface, and the sensor main body before being attached to the first base portion and the second base portion. [Figure 13] FIG. 13 is a perspective view showing the first base portion and second base portion and the sensor main body at positions fixed to the concrete surface during the work of placing the sensor main body. [Figure 14]FIG. 14 is a perspective view showing the first and second base portions and the sensor main body in a position fixed to a concrete surface at the final stage of placement of the sensor main body. [Figure 15] FIG. 15 is a diagram showing a first base portion having a first guide portion made up of two grooves each tapered in the x direction. [Figure 16] FIG. 16 is a diagram showing a second base portion having a second guide portion formed by two grooves each tapered in the z direction. [Figure 17] FIG. 17 is a perspective view of the first base portion as viewed from the first upper surface side. [Figure 18] FIG. 18 is a perspective view of the first base portion as viewed from the first lower surface side. [Figure 19] FIG. 19 is a perspective view of the metal plate. [Figure 20] 20 is a cross-sectional view showing the cross section of the first base portion taken along line XX' shown in FIG. [Figure 21] FIG. 21 is a perspective view of the auxiliary jig to which the first base portion and the second base portion are attached, as viewed from the main surface side. [Figure 22] FIG. 22 is a perspective view of the auxiliary jig to which the first base portion and the second base portion are attached, as viewed from the side opposite to the main surface. [Figure 23] FIG. 23 is a perspective view of the first base portion according to the modified example, as viewed from the first lower surface side. [Figure 24] FIG. 24 is a perspective view showing the positions of the first base portion and the two plates that form the first protrusion portion according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0011] A sensor device 10 according to an embodiment will be described below with reference to the drawings.

[0012] 1 is a diagram showing a sensor device 10 attached to a bridge. The sensor device 10 is attached to a concrete portion of the bridge. For example, the sensor device 10 is attached to a concrete surface 11 on the lower side of the bridge deck. Therefore, the sensor device 10 is attached to the surface of the bridge facing the ground.

[0013] The sensor device 10 attached to a bridge detects displacement of the bridge. For example, the sensor device 10 detects the amount of expansion and contraction in the travel direction of the target portion of the bridge where the sensor device 10 is installed. The amount of expansion and contraction is, for example, a change in distance of several nanometers to several hundred nanometers between two points that are several tens of centimeters apart. In this embodiment, the travel direction in which a vehicle travels on the bridge is called the first direction.

[0014] The sensor device 10 may be attached to other concrete parts of the bridge or concrete parts of other structures. The sensor device 10 may also be attached to a surface other than concrete. For example, the sensor device 10 may be attached to a steel frame or the like other than concrete. Furthermore, the sensor device 10 may detect other physical quantities in the structure, not limited to the displacement of the bridge.

[0015] Fig. 2 is a view of the sensor device 10 attached to the concrete surface 11 as seen from the y direction. Fig. 3 is a view of the sensor device 10 attached to the concrete surface 11 as seen from the z direction.

[0016] The x-direction is the first direction, i.e., the direction in which the vehicle travels on the bridge. The y-direction is the direction across the lanes on the bridge. The z-direction is the vertical direction on the bridge.

[0017] The sensor device 10 includes a sensor body 14, a first base portion 21, and a second base portion 22. The sensor body 14 includes a first sensor portion 15, a second sensor portion 16, and a sensor 17.

[0018] The first sensor unit 15 and the second sensor unit 16 are relatively movable in a linear manner. At least the housings of the first sensor unit 15 and the second sensor unit 16 are made of resin such as plastic. This allows the first sensor unit 15 and the second sensor unit 16 to be lightweight and inexpensive.

[0019] The sensor 17 detects displacement in the direction of relative movement between the first sensor unit 15 and the second sensor unit 16. For example, the sensor 17 detects the amount of expansion or contraction in the direction of relative movement between the first sensor unit 15 and the second sensor unit 16 as the displacement. The sensor 17 is provided inside one or both of the first sensor unit 15 and the second sensor unit 16. The sensor 17 then transmits the detected displacement, for example, the amount of expansion or contraction, to an external device.

[0020] The first base portion 21 and the second base portion 22 fix the sensor main body 14 to the concrete surface 11. In this embodiment, the first base portion 21 and the second base portion 22 have the same configuration.

[0021] In this embodiment, the first upper surface 25 of the first base portion 21 is fixed to the concrete surface 11 with an adhesive. Also, in this embodiment, the second upper surface 26 of the second base portion 22 is fixed to the concrete surface 11 with an adhesive. Note that the first base portion 21 and the second base portion 22 may be fixed to the concrete surface 11 with a connecting member other than an adhesive, for example, a bolt or the like.

[0022] The first sensor unit 15 is attached to a first base unit 21 fixed to the concrete surface 11 by screwing with bolts. The second sensor unit 16 is attached to a second base unit 22 fixed to the concrete surface 11 by screwing with bolts.

[0023] Here, the first sensor unit 15 and the second sensor unit 16 are attached to the first base unit 21 and the second base unit 22 so that the direction of relative movement is parallel to the first direction. The sensor device 10 attached in this manner can detect displacement in the direction of relative movement, thereby accurately detecting displacement of the bridge in the first direction.

[0024] FIG. 4 is a flowchart showing the procedure for attaching the sensor device 10 to the concrete surface 11.

[0025] In the description of FIG. 4, reference will be made to FIGS. 5 to 11. FIG. 5 is a diagram illustrating the details of the work in the preparation step (S11). FIG. 6 is a diagram illustrating the details of the work in the adhesion step (S12-1). FIG. 7 is a diagram illustrating the details of the work in the hardening step (S12-2). FIG. 8 is a diagram illustrating the details of the work in the fixing step (S12) using anchor bolts 48. FIG. 9 is a diagram illustrating the details of the work in the removal step (S13). FIG. 10 is a diagram illustrating the details of the work of arranging the sensor main body 14 in the attachment step (S14). FIG. 11 is a diagram illustrating the details of the work of screwing the sensor main body 14 in the attachment step (S14).

[0026] The sensor device 10 is attached to the concrete surface 11 according to the procedure shown in FIG.

[0027] First, the worker performs a preparation step (S11).

[0028] In the preparation step (S11), as shown in Fig. 5, the worker attaches the first base portion 21 and the second base portion 22 to the rigid auxiliary jig 32 in the same positional relationship as when they are attached to the concrete surface 11. The auxiliary jig 32 is, for example, in the form of a thin metal plate.

[0029] The first base portion 21 is attached to the auxiliary jig 32 by screwing using the first jig fixing bolts 33. As a result, the first base portion 21 has a first lower surface 35, which is the surface opposite to the first upper surface 25, in contact with a main surface 37, which is one surface of the auxiliary jig 32.

[0030] The second base portion 22 is attached to the auxiliary jig 32 by screwing using the second jig fixing bolts 34. As a result, the main surface 37 of the auxiliary jig 32 comes into contact with the second lower surface 36, which is the surface of the second base portion 22 opposite to the second upper surface 26.

[0031] A first screw hole 38 is formed in a first lower surface 35 of the first base portion 21, and the first jig fixing bolt 33 is screwed into the first screw hole 38. A second screw hole 39 is formed in a second lower surface 36 of the second base portion 22, and the second jig fixing bolt 34 is screwed into the second screw hole 39.

[0032] In addition, the auxiliary jig 32 has through holes through which the bolt shafts of the first jig fixing bolts 33 and the second jig fixing bolts 34 pass, so that the distance in the relative movement direction between the first base portion 21 and the second base portion 22 and the respective postures of the first base portion 21 and the second base portion 22 are installed in the same positional relationship as when installed on the concrete surface 11.

[0033] Furthermore, the first base portion 21 has, on the first lower surface 35, a plurality of first pins 41 that protrude perpendicularly from the first lower surface 35. Although only one first pin 41 is depicted in Fig. 5, the first base portion 21 actually has a plurality of first pins 41 lined up in the depth direction of Fig. 5.

[0034] The second base portion 22 has, on the second lower surface 36, a plurality of second pins 42 that protrude perpendicularly from the second lower surface 36. Although only one second pin 42 is depicted in Fig. 5, the second base portion 22 actually has a plurality of second pins 42 lined up in the depth direction of Fig. 5.

[0035] The auxiliary jig 32 has a plurality of first restriction holes 43 formed at positions where the plurality of first pins 41 are inserted when the first base portion 21 is attached. Although only one first restriction hole 43 is depicted in Fig. 5, the auxiliary jig 32 has a plurality of first restriction holes 43 formed side by side in the depth direction of Fig. 5.

[0036] The auxiliary jig 32 has a plurality of second restriction holes 44 formed at positions where the plurality of second pins 42 are inserted when the second base portion 22 is attached. Although only one second restriction hole 44 is depicted in Fig. 5, the auxiliary jig 32 has a plurality of second restriction holes 44 formed side by side in the depth direction of Fig. 5.

[0037] By using the first base portion 21, the second base portion 22 and the auxiliary jig 32 configured in this manner, the worker can attach the first base portion 21 and the second base portion 22 to the auxiliary jig 32 so that the distance and posture between the first base portion 21 and the second base portion 22 are the same as when they are attached to the concrete surface 11 with greater precision.

[0038] It is preferable that the diameter of each of the openings of the plurality of first restriction holes 43 and the plurality of second restriction holes 44 is smaller than the diameter of the through holes through which the bolt shafts of the first jig fixing bolts 33 and the second jig fixing bolts 34 pass. This allows the worker to attach the first base portion 21 and the second base portion 22 to the auxiliary jig 32 with high precision, even if there is an error due to screwing.

[0039] Next, the worker performs the fixing step (S12).

[0040] In the fixing step (S12), the worker fixes the first base portion 21 and the second base portion 22 to the concrete surface 11 while they are attached to the auxiliary jig 32. In this embodiment, in the fixing step (S12), the worker performs an adhesion step (S12-1) and a hardening step (S12-2).

[0041] 6, in the bonding step (S12-1), the worker applies adhesive to the first upper surface 25 of the first base portion 21 and applies adhesive to the second upper surface 26 of the second base portion 22. In this embodiment, when applying the adhesive, the worker may apply the adhesive by coating, dropping, or injecting the adhesive using a nozzle or the like.

[0042] Then, the worker adheres the first base portion 21 and the second base portion 22, to which the adhesive has been applied, to the concrete surface 11. For example, in the adhering step (S12-1), the worker holds the auxiliary jig 32 and butts the first base portion 21 and the second base portion 22 against the concrete surface 11. Because the positional relationship between the first base portion 21 and the second base portion 22 is fixed by the auxiliary jig 32, the worker can relatively easily place the first base portion 21 and the second base portion 22 at predetermined attachment positions on the concrete surface 11.

[0043] 6, the auxiliary jig 32 may have one or more tape application portions 46 on the main surface 37. Each of the one or more tape application portions 46 is provided in an area on the main surface 37 that is different from the areas where the first base portion 21 and the second base portion 22 are attached.

[0044] Each of the one or more tape application portions 46 has a flat area that is approximately the same height as the first upper surface 25 of the first base portion 21 and the second upper surface 26 of the second base portion 22. When the first base portion 21 and the second base portion 22 are adhered to the concrete surface 11, this flat area comes close to the concrete surface 11 with a gap that is approximately the same as the thickness of the double-sided tape 47.

[0045] Then, in the adhering step (S12-1), the worker adheres the double-sided tape 47 to the tape adhering portion 46, adheres the first base portion 21 with the adhesive attached to the concrete surface 11, and adheres the double-sided tape 47 to the concrete surface 11. This temporarily fixes the auxiliary jig 32 to the concrete surface 11. Therefore, the worker can release his or her hands from the auxiliary jig 32 until the adhesive hardens.

[0046] In the hardening step (S12-2), the worker hardens the adhesive while adhering the first base portion 21 and the second base portion 22 to the concrete surface 11 with the adhesive, as shown in FIG. 7. For example, in the hardening step (S12-2), the worker may blow warm air onto the first base portion 21 and the second base portion 22 using a heat gun or the like to shorten the time it takes for the adhesive to harden. Furthermore, the worker may remove any adhesive that has protruded from the areas of the first base portion 21 and the second base portion 22, for example by wiping it off, before the adhesive hardens.

[0047] In addition, in the fixing step (S12), the worker may use anchor bolts 48 to fix the first base portion 21 and the second base portion 22 to the concrete surface 11 instead of the bonding step (S12-1) and the hardening step (S12-2), as shown in Figure 8.

[0048] In this case, each of the first base portion 21 and the second base portion 22 is formed of, for example, metal. Each of the first base portion 21 and the second base portion 22 has an anchor bolt through-hole 49 formed therein, through which the bolt shaft of an anchor bolt 48 passes. The first base portion 21 is fixed to the concrete surface 11 by the anchor bolt 48 so that the first upper surface 25 contacts the concrete surface 11. The second base portion 22 is fixed to the concrete surface 11 by the anchor bolt 48 so that the second upper surface 26 contacts the concrete surface 11.

[0049] Next, the worker performs the removal step (S13).

[0050] In the removal step (S13), the worker removes the first jig fixing bolt 33 from the first base portion 21 and the second jig fixing bolt 34 from the second base portion 22, as shown in Fig. 9, thereby removing the auxiliary jig 32 from the first base portion 21 and the second base portion 22. This leaves only the first base portion 21 and the second base portion 22 fixed to the concrete surface 11.

[0051] Next, the worker performs the installation step (S14).

[0052] In the mounting step (S14), the worker mounts the sensor main body 14 on the first base portion 21 and the second base portion 22 fixed to the concrete surface 11. In the mounting step (S14), the sensor main body 14 is fixed between the first sensor portion 15 and the second sensor portion 16 by a fixing mechanism. Therefore, in the mounting step (S14), the first sensor portion 15 and the second sensor portion 16 are fixed in a predetermined relative positional relationship without moving relative to each other.

[0053] For example, as shown in Fig. 10, the worker positions the first sensor portion 15 of the sensor main body 14 by bringing it close to the first base portion 21. Next, the worker brings the second sensor portion 16 of the sensor main body 14 close to the second base portion 22. Next, the worker fine-tunes the overall position of the sensor main body 14 to place the sensor main body 14 in a predetermined position.

[0054] 11, the worker attaches the first sensor unit 15 of the sensor main body 14 to the first base unit 21 by screwing it using the first sensor fixing bolt 51. The worker also attaches the second sensor unit 16 of the sensor main body 14 to the second base unit 22 by screwing it using the second sensor fixing bolt 52.

[0055] A first screw hole 38 into which the first sensor fixing bolt 51 is screwed is formed in the first lower surface 35 of the first base portion 21. The first screw hole 38 is also used as the first jig fixing bolt 33 used to fix the auxiliary jig 32. A second screw hole 39 into which the second sensor fixing bolt 52 is screwed is formed in the second lower surface 36 of the second base portion 22. The second screw hole 39 is also used as the second jig fixing bolt 34 used to fix the auxiliary jig 32.

[0056] Further, the first sensor part 15 has a through hole formed therein through which the bolt shaft of the first sensor fixing bolt 51 passes. The second sensor part 16 has a through hole formed therein through which the bolt shaft of the second sensor fixing bolt 52 passes.

[0057] According to the above-described mounting method, the sensor body 14 can be mounted on the concrete surface 11 of the bridge so that the relative movement direction between the first sensor unit 15 and the second sensor unit 16 is parallel to the first direction, which is the traveling direction on the bridge.

[0058] FIG. 12 is a perspective view showing the first base portion 21 and the second base portion 22 in a position fixed to the concrete surface 11, and the sensor main body 14 before being attached to the first base portion 21 and the second base portion 22.

[0059] In the mounting step (S14), the worker places the sensor main body 14 at a mounting position where it can be fastened with bolts to the first base portion 21 and the second base portion 22 that are fixed to the concrete surface 11. However, when mounting the sensor device 10 on the underside of a bridge deck, for example, the worker must work while looking up, which is very difficult.

[0060] Therefore, in order to assist the worker in the installation step (S14), the first sensor unit 15 according to this embodiment has a first protrusion 61. Furthermore, the first base unit 21 has a first guide unit 62.

[0061] The first protrusion 61 is provided on the first mounting surface 55 that comes into contact with the first base portion 21. The first protrusion 61 protrudes from the first mounting surface 55 in a direction toward the first base portion 21, and has a shape that extends linearly in the direction of relative movement.

[0062] For example, the first protrusion 61 is two plates 63 provided in a contact area with the first base portion 21 of the first mounting surface 55. The two plates 63 constituting the first protrusion 61 are provided parallel to the direction of relative movement. Note that in this example, the first protrusion 61 is composed of two plates 63, but it may be composed of one plate 63 or three or more plates 63.

[0063] The first guide portion 62 is formed on the first lower surface 35 with which the first sensor unit 15 comes into contact. The first guide portion 62 forms a space into which the first protrusion 61 is inserted. When the first protrusion 61 is inserted, the first guide portion 62 allows the first protrusion 61 to move in a first direction and restricts movement of the first protrusion 61 in a direction that is parallel to the first lower surface 35 and perpendicular to the first direction. For example, the first guide portion 62 allows the first protrusion 61 to move in the x direction and restricts movement in the y direction.

[0064] For example, the first guide portion 62 is formed in the first lower surface 35 and is two grooves 67 that extend linearly in the first direction. The two plates 63 that constitute the first protrusion 61 are inserted into the two grooves 67 that constitute the first guide portion 62 when the first sensor unit 15 is disposed at an attachment position that allows it to be fastened to the first base portion 21 with bolts. Note that in this example, the first guide portion 62 is formed by two grooves 67, but the first guide portion 62 may be formed by one groove 67 or three or more grooves 67 as long as the number of grooves 67 is the same as the number of plates 63 that constitute the first protrusion 61.

[0065] In addition, in order to assist the worker in the installation step (S14), the second sensor unit 16 according to this embodiment has a second protrusion 65. The second base unit 22 also has a second guide unit 66.

[0066] The second protrusion 65 is provided on the second mounting surface 56 that comes into contact with the second base portion 22. The second protrusion 65 protrudes from the second mounting surface 56 in a direction toward the second base portion 22, and has a shape that extends linearly in the direction of relative movement.

[0067] For example, the second protruding portion 65 is two plates 63 provided in an area of ​​the second mounting surface 56 that comes into contact with the second base portion 22. The two plates 63 that make up the second protruding portion 65 are provided parallel to the direction of relative movement. Note that in this example, the second protruding portion 65 is made up of two plates 63, but it may be made up of one plate 63 or three or more plates 63.

[0068] The second guide portion 66 is formed on the second lower surface 36 with which the second sensor unit 16 comes into contact. The second guide portion 66 forms a space into which the second protrusion 65 is inserted. When the second protrusion 65 is inserted, the second guide portion 66 allows the second protrusion 65 to move in a first direction and restricts movement of the second protrusion 65 in a direction that is parallel to the second lower surface 36 and perpendicular to the first direction. For example, the second guide portion 66 allows the second protrusion 65 to move in the x direction and restricts movement in the y direction.

[0069] For example, the second guide portion 66 is formed in the second lower surface 36 and is two grooves 67 that extend linearly in the first direction. The two plates 63 that constitute the second protrusion 65 are inserted into the two grooves 67 when the second sensor unit 16 is disposed in an attachment position that allows it to be fastened to the second base portion 22 with bolts. Note that, in this example, the second guide portion 66 is formed by two grooves 67, but the number of grooves 67 may be one, or three or more, as long as the number is the same as the number of plates 63 that constitute the first protrusion 61.

[0070] Moreover, the first sensor unit 15 according to this embodiment may further include a movement restriction unit 68 in order to assist the worker in the attachment step (S14).

[0071] The movement restricting portion 68 is provided on the first lower surface 35 of the first sensor unit 15. When the first sensor unit 15 is disposed at an attachment position where it can be screwed to the first base unit 21 with a bolt, the movement restricting portion 68 abuts against a side surface 69 of the first base unit 21 on the side of the second base unit 22. In other words, when the second protrusion 65 is inserted into the first guide portion 62, the movement restricting portion 68 restricts movement of the first sensor unit 15 so that it does not move in the direction from the second base unit 22 toward the first base unit 21 beyond the attachment position where it can be screwed to the first base unit 21 with a bolt.

[0072] FIG. 13 is a perspective view showing the first base portion 21 and the second base portion 22 at a position fixed to the concrete surface 11, and the sensor main body 14, during the work of placing the sensor main body 14.

[0073] In the attachment step (S14), the worker brings the first sensor portion 15 of the sensor main body 14 close to the first base portion 21 and inserts a portion of the first protrusion 61 into the first guide portion 62. For example, the worker inserts a portion of the two plates 63 that make up the first protrusion 61 into the two grooves 67 that make up the first guide portion 62.

[0074] In this state, movement of the first sensor unit 15 in the y direction is restricted. Therefore, by moving the sensor main body 14 in accordance with the guidance of the first guide unit 62, the operator can move the first sensor unit 15 while keeping the direction of relative movement parallel to the first direction.

[0075] Next, the worker moves the sensor main body 14, increasing the insertion depth of the first protrusion 61 into the first guide portion 62, while at the same time bringing the second sensor portion 16 of the sensor main body 14 closer to the second base portion 22 and inserting a portion of the second protrusion 65 into the second guide portion 66.

[0076] In this state, movement of the second sensor unit 16 in the y direction is restricted. Therefore, by moving the sensor main body 14 in accordance with the guidance of the second guide unit 66, the operator can move the second sensor unit 16 while keeping the relative movement direction parallel to the first direction.

[0077] FIG. 14 is a perspective view showing the first base portion 21 and the second base portion 22 in a position fixed to the concrete surface 11, and the sensor main body 14 at the final stage of placement of the sensor main body 14.

[0078] Furthermore, the worker inserts the first protrusion 61 into the first guide portion 62 and the second protrusion 65 into the second guide portion 66, and then presses the sensor main body 14 against the first base portion 21 and the second base portion 22.

[0079] Next, the worker moves sensor main body 14 in the direction from second base portion 22 toward first base portion 21 while pressing sensor main body 14 against first base portion 21 and second base portion 22.

[0080] When sensor main body 14 is moved in a direction from second base portion 22 toward first base portion 21 while pressed against first base portion 21 and second base portion 22, movement restricting portion 68 abuts against a side surface 69 of first base portion 21 on the side of second base portion 22. With movement restricting portion 68 in a position where it abuts against side surface 69, the worker can screw first sensor unit 15 to first base portion 21 with a bolt, and can screw second sensor unit 16 to second base portion 22 with a bolt.

[0081] As described above, in the sensor device 10 according to this embodiment, the first sensor unit 15 is provided with the first protrusion 61 and the movement restricting portion 68, and the first base unit 21 is formed with the first guide portion 62. In addition, the second sensor unit 16 is provided with the second protrusion 65, and the second base unit 22 is formed with the second guide portion 66. This allows the worker to position the sensor main body 14 on the first base unit 21 and the second base unit 22 in an attachment position where it can be easily fastened with bolts to the first base unit 21 and the second base unit 22, which are fixed to the concrete surface 11, even if the worker works while looking up.

[0082] FIG. 15 is a diagram showing the first base portion 21 having the first guide portion 62 formed by two grooves 67 each tapered in the x direction.

[0083] When the first guide portion 62 is formed of two grooves 67, each of the two grooves 67 forming the first guide portion 62 may be tapered in the x direction, as shown in Fig. 15. That is, each of the two grooves 67 forming the first guide portion 62 may be formed so that, at least at the end portion on the second base portion 22 side, the length in the y direction, which is the groove width, becomes narrower from the end portion on the second base portion 22 side toward the end portion opposite the second base portion 22.

[0084] The opening of each of the two grooves 67 constituting the first guide portion 62 configured in this manner on the side surface 69 of the first guide portion 62 on the side of the second base portion 22 is sufficiently wider than the thickness of each of the two plates 63 constituting the first protruding portion 61. Therefore, the operator can easily insert the two plates 63 constituting the first protruding portion 61 into the two grooves 67 constituting the first guide portion 62.

[0085] FIG. 16 is a diagram showing the second base portion 22 having a second guide portion 66 formed by two grooves 67 each tapered in the z direction.

[0086] When the second guide portion 66 is configured by two grooves 67, each of the two grooves 67 that configure the second guide portion 66 may be tapered in the z direction, as shown in Fig. 16. That is, each of the two grooves 67 that configure the second guide portion 66 may be formed so that the length of the width in the y direction, which is the groove width, becomes narrower from the surface of the second lower surface 36 toward the groove bottom.

[0087] The openings of the two grooves 67 constituting the second guide portion 66 on the surface of the second lower face 36 are each sufficiently wider than the thickness of each of the two plates 63 constituting the second protruding portion 65. This allows the operator to easily insert the two plates 63 constituting the second protruding portion 65 into the two grooves 67 constituting the second guide portion 66.

[0088] Similarly, each of the two grooves 67 constituting the first guide part 62 may be tapered in the z direction. That is, each of the two grooves 67 constituting the first guide part 62 may be formed so that the groove width narrows from the surface of the first lower surface 35 toward the groove bottom.

[0089] Fig. 17 is a perspective view of the first base portion 21 as viewed from the first upper surface 25 side. Fig. 18 is a perspective view of the first base portion 21 as viewed from the first lower surface 35 side. Fig. 19 is a perspective view of the metal plate 70. Fig. 20 is a cross-sectional view of the first base portion 21 taken along line XX' shown in Fig. 17.

[0090] Next, with reference to FIGS. 17 to 20, an example of the configuration of the first base portion 21 will be described.

[0091] The second base portion 22 has the same configuration as the first base portion 21. Therefore, in Figures 17 to 20, the reference numerals of the components of the first base portion 21 are followed by the reference numerals of the corresponding components of the second base portion 22 in parentheses, and the description of the second base portion 22 will be omitted. In the description of the first base portion 21, the side of the first base portion 21 that is attached to the concrete surface 11 will be called the upper side, and the side of the first base portion 21 to which the sensor main body 14 is attached will be called the lower side.

[0092] The first base portion 21 includes a metal plate 70 and a frame 72 .

[0093] As shown in Figures 19 and 20, the metal plate 70 is a thin plate having a substantially rectangular flat surface. The metal plate 70 is made of, for example, stainless steel. The metal plate 70 has, for example, a long side of the flat surface of about 80 mm, a short side of the flat surface of about 35 mm, and a thickness of about 0.3 mm. The metal plate 70 has a plurality of holes 74 formed in the flat surface.

[0094] The frame 72 is formed to surround the edges of the metal plate 70 and holds the metal plate 70. The frame 72 is made of resin such as plastic. The frame 72 sandwiches the edges of the metal plate 70 from above and below in the thickness direction along the entire periphery of the four sides of the rectangular plane of the metal plate 70. For example, the frame 72 is molded integrally with the metal plate 70 by insert molding, in which the metal plate 70 is molded while being held in a mold.

[0095] When viewed from above, the frame 72 is rectangular, with the long side of the periphery being approximately 94 mm, the short side being approximately 37 mm, and the thickness of the frame 72 being approximately 10 mm.

[0096] The frame 72 exposes a portion of the surface of the metal plate 70 on the first upper surface 25 side, excluding the edge portions. The frame 72 also exposes a central portion of the surface of the metal plate 70 on the first lower surface 35 side. The multiple holes 74 are formed in overlapping portions between the exposed area of ​​the surface of the metal plate 70 on the first upper surface 25 side and the exposed area of ​​the surface of the metal plate 70 on the first lower surface 35 side. This allows the molding device to mold the frame 72 while holding the metal plate 70 via the multiple holes 74.

[0097] As shown in FIG. 17 , the frame 72 has a sidewall 75 on the first upper surface 25 side. The sidewall 75 is formed to surround the exposed portion of the surface of the metal plate 70 on the first upper surface 25 side. The sidewall 75 is formed, for example, along the entire periphery of a substantially rectangular plane. The sidewall 75 is made of resin such as plastic. For example, the sidewall 75 is molded integrally with the frame 72.

[0098] By having such side walls 75, the first base portion 21 forms an adhesive space 76 in a recessed portion having the exposed portion on the surface on the first upper surface 25 side of the metal plate 70 and the frame 72 as its bottom surface and the side walls 75 as its side surfaces. An adhesive is applied to the adhesive space 76 for attaching the first base portion 21 to the concrete surface 11. The first base portion 21 can hold the adhesive applied to the adhesive space 76 at a predetermined thickness equivalent to the height of the side walls 75. This allows the first base portion 21 to be fixed to an uneven concrete surface 11 by the adhesive held at a predetermined thickness.

[0099] Furthermore, the exposed portion of the surface of the first upper surface 25 of the metal plate 70 may be processed using a sound blaster or the like to have a non-mirror-like surface. This improves the adhesion of the metal plate 70 to the adhesive. Furthermore, an adhesive that is compatible with both the metal plate 70 and the concrete surface 11 is applied to the adhesive space 76. For example, if the metal plate 70 is made of stainless steel, the adhesive may be a two-component acrylic adhesive (product name: Cemedine (registered trademark) Y751) containing an alkali-resistant additive. The adhesive may be any other material as long as it is compatible with both the metal plate 70 and the concrete surface 11. Such adhesives that are compatible with both the metal plate 70 and concrete and that dry quickly are relatively easily available.

[0100] As shown in FIG. 18, the frame 72 has two grooves 67 that form the first guide portion 62 on the first lower surface 35 side.

[0101] When the first sensor unit 15 is attached, the two plates 63 that constitute the first protrusion 61 provided on the first attachment surface 55 of the first sensor unit 15 are inserted into the two grooves 67. For example, the depth of each of the two grooves 67 is greater than the height of the two plates 63, for example, about 3 m. These two grooves 67 can guide the movement of the first sensor unit 15 when the first sensor unit 15 is attached to the first base unit 21.

[0102] 18, the frame 72 exposes the metal plate 70 in the region between the two grooves 67. The region where the metal plate 70 is exposed between the two grooves 67 on the first lower surface 35 has an adhesive space 76 on the opposite side. That is, the region where the metal plate 70 is exposed on the first lower surface 35 corresponds to the adhesive space 76. Therefore, the adhesive applied to the adhesive space 76 hardens in a short time by blowing hot air into the region where the metal plate 70 is exposed between the two grooves 67 on the first lower surface 35.

[0103] As shown in FIG. 18, the frame 72 has two first pins 41 on the first lower surface 35 side.

[0104] The two first pins 41 are cylindrical and protrude perpendicularly from the first lower surface 35. The two first pins 41 are formed to be slightly higher than the surrounding wall of the frame 72 on the first lower surface 35 side. When the first base portion 21 is attached to the auxiliary jig 32, the two first pins 41 are inserted into two first restriction holes 43 formed in the auxiliary jig 32. These two first pins 41 can restrict the relative position between the first base portion 21 and the auxiliary jig 32 so that the first base portion 21 is attached to a predetermined position on the auxiliary jig 32 with high precision. Note that in this example, the frame 72 has two first pins 41, but may have three or more first pins 41.

[0105] 18, the frame 72 has a plurality of first screw holes 38 formed on the first lower surface 35 side. In this example, the frame 72 has four first screw holes 38 at four corners of the substantially rectangular plane.

[0106] When the first base portion 21 is attached to the auxiliary jig 32, the first jig fixing bolts 33 are screwed into each of the plurality of first screw holes 38 via the auxiliary jig 32. As a result, the first base portion 21 is screwed to the auxiliary jig 32 by the plurality of first jig fixing bolts 33.

[0107] Furthermore, when the first sensor unit 15 is attached to the first base portion 21, the first sensor fixing bolts 51 are screwed into each of the first screw holes 38 via the first sensor unit 15. As a result, the first sensor unit 15 is screwed to the first base portion 21 by the first sensor fixing bolts 51.

[0108] Fig. 21 is a perspective view of the auxiliary jig 32 with the first base portion 21 and the second base portion 22 attached thereto, as viewed from the side of the main surface 37. Fig. 22 is a perspective view of the auxiliary jig 32 with the first base portion 21 and the second base portion 22 attached thereto, as viewed from the side opposite to the main surface 37.

[0109] The auxiliary jig 32 is plate-shaped and made of a rigid metal such as stainless steel. The auxiliary jig 32 is made of, for example, SUS304. The auxiliary jig 32 may be manufactured by sheet metal processing such as bending and punching, or by casting.

[0110] The auxiliary jig 32 has a main surface 37 that is approximately in the longitudinal direction, and the longitudinal direction is approximately the same as the length of the sensor main body 14 in the direction of relative movement when the first sensor unit 15 and the second sensor unit 16 are fixed by the fixing mechanism. In addition, the auxiliary jig 32 has a side portion in the longitudinal direction that is bent at 90 degrees, thereby improving its strength in the longitudinal direction.

[0111] The auxiliary jig 32 has the first base portion 21 attached to one longitudinal end of the main surface 37, and the second base portion 22 attached to the other longitudinal end. The first base portion 21 is screwed to the auxiliary jig 32 by a plurality of first jig fixing bolts 33. The second base portion 22 is screwed to the auxiliary jig 32 by a plurality of second jig fixing bolts 34.

[0112] The auxiliary jig 32 has a plurality of first restriction holes 43 formed at positions where the plurality of first pins 41 are inserted when the first base portion 21 is attached. In this example, the auxiliary jig 32 has two first restriction holes 43 formed therein.

[0113] Furthermore, the auxiliary jig 32 has a plurality of second restriction holes 44 formed at positions where the plurality of second pins 42 are inserted when the second base portion 22 is attached. In this example, the auxiliary jig 32 has two second restriction holes 44 formed therein.

[0114] As a result, the first base portion 21 and the second base portion 22 are attached to the auxiliary jig 32 at a predetermined distance and in a predetermined posture.

[0115] The first base portion 21 and the second base portion 22 are then attached to the auxiliary jig 32 so that the adhesive space 76 is on the upper side. This allows the auxiliary jig 32 to bond the first base portion 21 and the second base portion 22, with adhesive applied to the adhesive space 76, to the concrete surface 11 while fixing the distance and posture of the first base portion 21 and the second base portion 22.

[0116] The auxiliary jig 32 is also formed with two ventilation openings 81. One of the two ventilation openings 81 is formed in a portion of the first lower surface 35 of the first base portion 21 corresponding to the area where the metal plate 70 is exposed. The other of the two ventilation openings 81 is formed in a portion of the second lower surface 36 of the second base portion 22 corresponding to the area where the metal plate 70 is exposed.

[0117] Each of the two air blowing openings 81 can expose the metal plate 70 of the first base portion 21 and the second base portion 22 on the surface opposite to the main surface 37. Then, in the curing step (S12-2), the worker blows hot air from a heat gun into each of the two air blowing openings 81. This allows the worker to cure the adhesive in a short time.

[0118] Further, two removal openings 82 are formed in the auxiliary jig 32. One of the two removal openings 82 is formed near the center of the auxiliary jig 32 with respect to the attachment position of the first base portion 21. The other of the two removal openings 82 is formed near the center of the auxiliary jig 32 with respect to the attachment position of the second base portion 22.

[0119] Each of the two removal openings 82 is provided to remove excess adhesive from at least a portion of the periphery of the first base portion 21 and the second base portion 22. Each of the two removal openings 82 is large enough for an operator's fingers to fit through, and is preferably an opening that is larger than a rectangle with sides of 18 mm, for example.

[0120] Although not shown, each of the two removal openings 82 may be formed by, for example, bending. In this case, the bending direction of each of the two removal openings 82 is opposite to the main surface 37. This allows the worker to prevent, for example, the adhesive from adhering to surrounding components when wiping off the adhesive.

[0121] The auxiliary jig 32 also has two lines 83 formed on its main surface 37 to indicate the amount of adhesive to be applied. The distance between the two lines 83 indicates the amount of adhesive to be applied to the adhesive space 76 of each of the first base portion 21 and the second base portion 22. For example, when squeezing adhesive from a cartridge, an operator first applies adhesive between the two lines 83 and then applies it to the adhesive space 76. This prevents excess adhesive from adhering to the adhesive space 76. The two lines 83 are preferably formed by a method that will not disappear with an organic solvent, such as laser processing. The distance between the two lines 83 is determined according to the diameter of the adhesive cartridge.

[0122] Additionally, the auxiliary jig 32 has one or more tape application portions 46. Each of the one or more tape application portions 46 is provided in an area on the main surface 37 that is different from the areas where the first base portion 21 and the second base portion 22 are attached.

[0123] Each of the one or more tape application portions 46 has a flat area that is adjacent to the concrete surface 11 with a gap corresponding to the thickness of the double-sided tape 47 when the first base portion 21 and the second base portion 22 are adhered to the concrete surface 11. In other words, the tape application portion 46 is formed so that the height of the flat area is such that when the double-sided tape 47 is adhered, the surface of the double-sided tape 47 facing the concrete surface 11 is substantially flush with the upper surface of the adhesive of the first base portion 21 and the second base portion 22.

[0124] Then, in the bonding step (S12-1), the worker bonds the double-sided tape 47 to the tape application unit 46, bonds the first base portion 21 and the second base portion 22 with the adhesive attached to the concrete surface 11, and bonds the double-sided tape 47 to the concrete surface 11. Such one or more tape application units 46 can temporarily fix the auxiliary jig 32, to which the first base portion 21 and the second base portion 22 are attached, to the concrete surface 11.

[0125] Furthermore, each of the one or more tape attachment portions 46 may have a through-hole formed therein. In this case, the worker may temporarily fix the auxiliary jig 32 to the concrete surface 11 using a concrete screw through the through-hole. The concrete screw has, for example, a drilled hole diameter of approximately 3.4 mm and a length of 25 mm. It is desirable to use a concrete screw with a diameter of 3.4 mm and a length of 25 mm. Such a concrete screw is short in length, making it easy to avoid interference with the reinforcement inside the concrete surface 11.

[0126] Fig. 23 is a perspective view of the first base portion 21 according to the modified example, viewed from the side of the first lower surface 35. Fig. 24 is a perspective view showing the first base portion 21 according to the modified example and the positions of the two plates 63 that constitute the first protrusion 61.

[0127] Next, with reference to Figures 23 and 24, modified examples of the first base portion 21 will be described. The modified examples of the second base portion 22 have the same configuration as the modified examples of the first base portion 21. Therefore, for the modified examples of the second base portion 22, in Figures 23 and 24, the reference numerals of the components of the first base portion 21 relating to the modified examples are followed in parentheses by the reference numerals of the corresponding components of the second base portion 22, and the description thereof will be omitted.

[0128] The first base portion 21 according to the modified example is made of, for example, metal.

[0129] The first base portion 21 according to the modified example does not have the adhesive space 76 formed therein, but instead has an anchor bolt through-hole 49 formed therein. The bolt shaft of an anchor bolt 48 passes through the anchor bolt through-hole 49. The first base portion 21 is fixed to the concrete surface 11 via the anchor bolt through-hole 49.

[0130] 17 and 18, the first base portion 21 according to the modified example has two first pins 41 and a plurality of first screw holes 38.

[0131] 23 and 24, the first base portion 21 according to the modified example has two protrusions 92 that constitute the first guide portion 62.

[0132] Each of the two protrusions 92 protrudes toward the surface side of the first lower surface 35. Each of the two protrusions 92 protrudes from a position that is lower than the surface of the first lower surface 35 by the height of the two plates 63 that constitute the first protrusion 61. Each of the two protrusions 92 is inserted without a gap between the two plates 63 that constitute the first protrusion 61 when the first sensor unit 15 is disposed in an attachment position relative to the first base unit 21. In the example of FIGS. 23 and 24 , one of the two protrusions 92 is formed on the edge on the second base unit 22 side. The other of the two protrusions 92 is formed on the edge opposite to the second base unit 22.

[0133] Such a convex portion 92 can guide the movement of the first sensor unit 15 when the first sensor unit 15 is attached to the first base unit 21.

[0134] Each of the two protrusions 92 may have a curved surface formed on the upper edge portion where the two plates 63 constituting the first protrusion 61 come into contact. This allows the worker to easily insert each of the two protrusions 92 between the two plates 63 constituting the first protrusion 61.

[0135] As described above, in the sensor device 10 according to this embodiment, the sensor main body 14 can be easily arranged at an attachment position where it can be fastened with bolts to the first base portion 21 and the second base portion 22 that are fixed to the concrete surface 11. As a result, with the sensor device 10 according to this embodiment, for example, the sensor device 10 can be attached to the underside of a bridge deck, so even if a worker works while looking up, the sensor device 10 can be easily attached to an appropriate position.

[0136] Although the embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. Various modifications can be made to the embodiments. [Explanation of symbols]

[0137] 10 Sensor device 11 Concrete surface 14 Sensor body 15 First sensor section 16 Second sensor section 17 Sensors 21 First base part 22 Second base part 25 1st top surface 26 2nd top surface 32 Auxiliary jig 33 First jig fixing bolt 34 Second jig fixing bolt 35 1st bottom surface 36 2nd bottom surface 38 First screw hole 39 Second screw hole 37 Main Surface 41 First pin 42 2nd pin 43 First Restriction Hole 44 Second Restriction Hole 46 Tape attachment section 47 Double-sided tape 48 anchor bolts 49 Anchor bolt through hole 51 First sensor fixing bolt 52 Second sensor fixing bolt 55 First mounting surface 56 Second mounting surface 61 1st protrusion 62 First guide section 63 board 65 Second protrusion 66 Second guide section 67 Groove 68 Movement Control Department 69 Side 70 metal plate 72 frames 74 holes 75 side wall 76 Adhesive Space 81 Ventilation opening 82 Removal opening 83 lines 92 Convex part

Claims

1. a first base portion and a second base portion fixed to a structure and spaced a predetermined first distance apart in a first direction; a sensor body attached to the first base portion and the second base portion and configured to measure displacement of the structure in the first direction; Equipped with The sensor body includes: a first sensor unit and a second sensor unit that are linearly movable relative to each other; a sensor that detects a displacement in a relative movement direction in which the first sensor unit and the second sensor unit move relative to each other; and the first sensor unit is attached to the first base unit fixed to the structure, the second sensor unit is attached to the second base unit fixed to the structure, the first sensor unit and the second sensor unit are attached to the first base unit and the second base unit such that the direction of the relative movement is parallel to the first direction; the first sensor portion is provided on a first mounting surface with which the first base portion comes into contact, and has a first protrusion portion that extends linearly in the direction of the relative movement; The first base portion has a first guide portion formed on a first lower surface with which the first sensor portion comes into contact, allowing the first protrusion portion to move in the first direction, and restricting movement of the first protrusion portion in a direction parallel to the first lower surface and perpendicular to the first direction. Sensor device.

2. the second sensor portion is provided on a second mounting surface with which the second base portion comes into contact, and has a second protruding portion that extends linearly in the direction of the relative movement; The second base portion has a second guide portion formed on a second lower surface with which the second sensor portion comes into contact, allowing the second protrusion portion to move in the first direction, and restricting movement of the second protrusion portion in a direction parallel to the second lower surface and perpendicular to the first direction. The sensor device according to claim 1 .

3. the first protrusions are two plates that are provided on the first mounting surface in parallel with the relative movement direction and extend in the relative movement direction, The first guide portion is formed on the first lower surface so as to extend linearly in the first direction, and is two grooves into which the two plates are inserted when the first sensor portion is disposed at an attachment position relative to the first base portion. The sensor device according to claim 1 .

4. Each of the two grooves is formed so that at least at the end portion on the second base portion side, the groove width becomes narrower from the end portion on the second base portion side toward the end portion opposite to the second base portion. The sensor device according to claim 3 .

5. Each of the two grooves has a groove width that narrows from the surface of the first lower surface toward the groove bottom. The sensor device according to claim 3 .

6. The first sensor unit has a movement restricting portion that abuts against a side surface of the first base unit that faces the second base unit when the first sensor unit is disposed at an attachment position relative to the first base unit. The sensor device according to claim 1 .

7. the first protrusions are two plates that are provided on the first mounting surface in parallel with the relative movement direction and extend in the relative movement direction, the first guide portion is a convex portion that protrudes from a surface side of the first lower surface, The protrusion is inserted between the two plates when the first sensor unit is disposed at an attachment position relative to the first base unit. The sensor device according to claim 1 .

8. The protrusions are formed on an edge on the second base side and an edge on the opposite side to the second base side. The sensor device according to claim 7 .

9. A method for attaching the sensor device according to any one of claims 1 to 8 to the structure, comprising: a preparation step of attaching the first base portion and the second base portion to a rigid auxiliary jig in the same positional relationship as when the first base portion and the second base portion are attached to the structure; a fixing step of fixing the first base portion and the second base portion to the structure in a state where the first base portion and the second base portion are attached to the auxiliary jig; a removal step of removing the auxiliary jig from the first base portion and the second base portion fixed to the structure; an attachment step of attaching the sensor main body to the first base portion and the second base portion fixed to the structure; Including mounting instructions.

10. the first base portion has, on the first lower surface, a plurality of first pins that protrude perpendicularly from the first lower surface; The auxiliary jig has a plurality of first restriction holes formed at positions into which the plurality of first pins are inserted when the first base portion is attached.

10. The mounting method of claim 9.

11. the first base portion includes a metal plate and a frame integrally formed with the metal plate so as to surround an edge of the metal plate; The frame has a bottom defined by the metal plate and a side wall that defines an adhesive space therein; The fixing step comprises: a bonding step of applying an adhesive to the adhesive space and bonding the first base portion with the adhesive applied thereto to the structure; a curing step of curing the adhesive in a state where the first base portion is adhered to the structure; 10. The method of claim 9, comprising:

12. the first base portion has the metal plate exposed in a region of the first lower surface corresponding to the adhesive space, the auxiliary jig is plate-shaped, and has an air blowing opening formed in a portion of the first lower surface corresponding to a region where the metal plate is exposed, In the curing step, hot air is blown through the air blowing opening. The mounting method of claim 11.

13. the auxiliary jig is plate-shaped, and a removal opening for removing excess adhesive is formed in at least a part of the periphery of the first base portion; In the curing step, the adhesive that has protruded around the periphery of the first base portion is removed. The mounting method of claim 11.

14. The auxiliary jig has two lines formed on a main surface to which the first base portion is attached, the lines indicating the amount of adhesive applied. The mounting method of claim 11.

15. the auxiliary jig has a tape application portion which is a flat area adjacent to the structure when the first base portion and the second base portion are adhered to the structure, the tape application portion being a region different from a region to which the first base portion and the second base portion are attached, In the adhering step, a double-sided adhesive tape is adhered to the tape adhering portion, and the first base portion to which the adhesive is attached is adhered to the structure, and the double-sided adhesive tape is adhered to the structure. The mounting method of claim 11.

16. In the fixing step, the first base portion and the second base portion are fixed to the structure by anchor bolts while being attached to the auxiliary jig.

10. The mounting method of claim 9.

17. the structure is a bridge, In the fixing step, the first base portion and the second base portion are fixed to the bridge from below the deck slab while being attached to the auxiliary jig.

10. The mounting method of claim 9.

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