Connection device, mounting method, and sensor device

Abstract

To attach a target device in an accurate position and orientation on a surface with uneven surfaces.SOLUTION: A connection device includes: a metal plate; a base part that exposes a part of a first side of the metal plate and holds the edge of the metal plate by sandwiching it from above and below in the thickness direction; a side wall that is provided to the base part so as to surround the exposed part on the first side and forms an adhesive space into which adhesive is injected; and a plurality of nuts embedded in the base so that bolts can be screwed in from a second side opposite to the first side.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a connecting device, an attachment method, and a sensor device.

Background Art

[0002] For example, a sensor device for measuring minute displacements such as the amount of expansion and contraction of a structure such as a bridge is known. Such a sensor device detects the displacement of the structure while being attached to the structure. Since the sensor device is attached to the structure, it is preferable to configure the housing with a resin such as plastic to reduce the weight. Further, when the structure is concrete, the sensor device is attached by, for example, an adhesive.

[0003] Patent Document 1 describes a technique for bonding the curved surfaces of two members with a double-sided adhesive tape and an adhesive. Patent Document 2 describes a construction method for adjusting the height of a building floor and bonding an object onto the floor after the height adjustment.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, adhesives having good adhesion compatibility with both resins such as plastic and concrete are often moisture-curing types. Therefore, adhesives having good adhesion compatibility with both resins and concrete take time to dry. Therefore, when attaching the sensor device to a concrete structure with such an adhesive, the sensor device has to be continuously fixed until the adhesive dries, which makes the work very difficult.

[0006] Furthermore, concrete structures have fine irregularities on their surface. Therefore, it was difficult to bond resin to concrete structures with sufficient strength. Additionally, when bonding multiple components to a concrete structure within the same plane, the irregularities caused each component to tilt in a different direction, making it difficult to bond multiple components in the correct position and orientation.

[0007] The present invention has been made in view of the above, and aims to provide a connection device, a mounting method, and a sensor device that can mount a target device in an accurate position and orientation to a surface having irregularities on its surface. [Means for solving the problem]

[0008] To solve the above-mentioned problems and achieve the objective, the connecting device according to the present invention comprises a metal plate, a base portion that exposes a part of a first surface which is one side of the metal plate and holds the edge portion of the metal plate by sandwiching it from above and below in the thickness direction, a side wall provided on the base portion so as to surround the exposed portion on the first surface and forming an adhesive space into which adhesive is injected, and a plurality of nuts embedded in the base portion so as to allow bolts to be screwed in from the side of the second surface which is opposite to the first surface. [Effects of the Invention]

[0009] According to the present invention, the target device can be mounted in the correct position and orientation on a surface that has irregularities. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 shows a sensor device attached to a bridge. [Figure 2] Figure 2 shows a sensor device attached to a concrete surface. [Figure 3] Figure 3 is a perspective view of the connection device from above. [Figure 4] Figure 4 is a perspective view of the connection device from below. [Figure 5] Figure 5 is a perspective view of a metal plate. [Figure 6] Figure 6 is a cross-sectional view showing an X-X' line cross-section in the connecting device. [Figure 7] Figure 7 is a cross-sectional view showing a Y-Y' line cross-section in the connecting device. [Figure 8] Figure 8 is a view showing the connecting device in a state attached to the sensor device main body. [Figure 9] Figure 9 is a cross-sectional view showing a cross-section of the connecting device in a state where an adhesive is injected into the adhesive space. [Figure 10] Figure 10 is a flowchart showing the flow of an attachment method for attaching the sensor device to the concrete surface. [Figure 11] Figure 11 is a view showing an example of an auxiliary jig used in attaching the sensor device. [Figure 12] Figure 12 is a view showing an example of an adhesion operation. [Figure 13] Figure 13 is a view showing another example of an adhesion operation. [Figure 14] Figure 14 is a perspective view of the connecting device according to the first modification example as viewed from above. [Figure 15] Figure 15 is a perspective view of the connecting device according to the second modification example as viewed from above.

Embodiments for Carrying Out the Invention

[0011] Hereinafter, the sensor device 10 according to the embodiment will be described with reference to the drawings.

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

[0013] The sensor device 10 attached to the bridge detects the displacement of the bridge. For example, the sensor device 10 detects the amount of expansion and contraction in the traveling direction at the target portion where the sensor device 10 of the bridge is provided. The amount of expansion and contraction is, for example, a change in distance from several nanometers to several hundred nanometers between two points at a distance of about several tens of centimeters.

[0014] Note that the sensor device 10 may be attached to other concrete portions of the bridge or concrete portions of other structures. The sensor device 10 may be attached to a surface with minute irregularities other than concrete. Also, 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 diagram showing the sensor device 10 attached to the concrete surface 11. The sensor device 10 includes a sensor device main body 14, a first connection device 21, and a second connection device 22. The sensor device main body 14 includes a first member 15, a second member 16, and a sensor 17.

[0016] The first member 15 and the second member 16 are relatively movable in the first direction. The first member 15 and the second member 16 are at least configured such that the housing is made of a resin such as plastic. Thereby, the first member 15 and the second member 16 are made lighter and less costly.

[0017] The sensor 17 detects the displacement in the first direction between the first member 15 and the second member 16. For example, the sensor 17 detects, as the displacement, the amount of expansion and contraction in the first direction between the first member 15 and the second member 16. The sensor 17 is provided inside one or both of the first member 15 and the second member 16. Then, the sensor 17 transmits the detected displacement, for example, the amount of expansion and contraction, to an external device.

[0018] The first connection device 21 and the second connection device 22 are devices for fixing the target device to the concrete surface 11. In this embodiment, the first connection device 21 and the second connection device 22 fix the sensor device body 14 to the concrete surface 11 as the target device. The first connection device 21 and the second connection device 22 have the same configuration. The first connection device 21 and the second connection device 22 are sometimes collectively referred to as the connection device 20.

[0019] The first connecting device 21 is attached to the housing of the first component 15 by screw fastening with bolts. The second connecting device 22 is attached to the housing of the second component 16 by screw fastening with bolts.

[0020] The first connecting device 21 is attached to the concrete surface 11 with adhesive on the side where the first member 15 is not attached. The second connecting device 22 is attached to the concrete surface 11 with adhesive on the side where the second member 16 is not attached.

[0021] Here, the first connecting device 21 and the second connecting device 22 are attached to the concrete surface 11 of the bridge by adhesive such that the first direction of the sensor device body 14 is parallel to the direction of travel, which is the direction in which displacement in the bridge is measured. As a result, the sensor device 10 can accurately detect displacement in the direction of travel of the bridge, such as expansion and contraction.

[0022] Figure 3 is a perspective view of the connecting device 20 from above. Figure 4 is a perspective view of the connecting device 20 from below. Figure 5 is a perspective view of the metal plate 32. Figure 6 is a cross-sectional view of the connecting device 20 showing the cross-section along line XX' in Figure 3. Figure 7 is a cross-sectional view of the connecting device 20 showing the cross-section along line YY' in Figure 3.

[0023] The configuration of the connection device 20 will be described below with reference to Figures 3 to 7. The side of the connection device 20 that is attached to the concrete surface 11 will be referred to as the upper side, and the side of the connection device 20 to which the sensor device body 14 is attached will be referred to as the lower side.

[0024] The connecting device 20 comprises a metal plate 32, a base portion 34, a side wall 36, and a plurality of nuts 40.

[0025] The metal plate 32 is a thin sheet with a roughly rectangular shape. The metal plate 32 is made of, for example, stainless steel. The metal plate 32 has dimensions such as a long side of approximately 76 mm, a short side of approximately 32 mm, and a thickness of approximately 0.3 mm.

[0026] The metal plate 32 has multiple holes 42 formed in its flat surface. In addition, the metal plate 32 has an inwardly cut-out portion 44 formed approximately in the center of the shorter side of its flat surface.

[0027] The base portion 34 is frame-shaped. The base portion 34 is made of a resin such as plastic. The base portion 34 holds the edges of the metal plate 32 by sandwiching them from above and below in the thickness direction. For example, the base portion 34 sandwiches almost the entire circumference of the four sides of the rectangular plane of the metal plate 32 from above and below in the thickness direction. For example, the base portion 34 is formed integrally with the metal plate 32 by an insert molding method in which the metal plate 32 is molded while being held in a mold.

[0028] Furthermore, the base portion 34 exposes a portion of the first surface 46, which is one of the surfaces of the metal plate 32. The first surface 46 is the upper surface of the metal plate 32, that is, the surface to which the concrete surface 11 is attached. For example, the exposed portion of the first surface 46 of the metal plate 32 is approximately rectangular.

[0029] Furthermore, in this embodiment, the base portion 34 also exposes a part of the second surface 48, which is opposite to the first surface 46. The second surface 48 is the lower surface of the metal plate 32, that is, the surface on which the sensor device body 14 is attached.

[0030] Furthermore, the base portion 34 exposes a portion of each of its first surface 46 and second surface 48 so that the multiple holes 42 formed in the metal plate 32 are exposed. This allows the molding apparatus to mold the base portion 34 while holding the metal plate 32 through the multiple holes 42.

[0031] For example, the base portion 34 is frame-shaped with a roughly rectangular outer circumference and a roughly rectangular inner circumference. The base portion 34 has a long side of approximately 80 mm and a short side of approximately 35 mm. Also, for example, the exposed portion of the metal plate 32 on the first surface 46 side is roughly rectangular, with a long side of approximately 64 mm and a short side of approximately 28 mm.

[0032] The side wall 36 is provided on the base portion 34 so as to surround the exposed portion of the first surface 46 of the metal plate 32. The side wall 36 is formed around the entire circumference of the base portion 34, which is a frame-shaped base portion with a substantially rectangular outer circumference, along the outer circumference on the side of the first surface 46. The side wall 36 is made of a resin such as plastic. For example, the side wall 36 is molded integrally with the base portion 34.

[0033] By having such a side wall 36, the connecting device 20 forms an adhesive space 50 within a concave portion with the exposed portion of the first surface 46 of the metal plate 32 and the base portion 34 as the bottom surface and the side wall 36 as the side surface. Adhesive for attaching the connecting device 20 to the concrete surface 11 is injected into the adhesive space 50. The connecting device 20 can hold the adhesive injected into the adhesive space 50 to a predetermined thickness equal to the height of the side wall 36. As a result, the connecting device 20 can be attached to the concrete surface 11, which has irregularities on its surface, by adhesive that is held to a predetermined thickness.

[0034] The base portion 34 has one or more injection holes 52 formed therein. Each of the one or more injection holes 52 penetrates from the second surface 48 side of the base portion 34, i.e., the side of the sensor device body 14, into the adhesive space 50. In this embodiment, the base portion 34 has two injection holes 52 formed therein. Each of the two injection holes 52 is formed in the center of the short side of the rectangular frame-shaped base portion 34. Each of the two injection holes 52 is formed at an angle to the vertical direction of the metal plate 32, with the opening on the second surface 48 side facing outward and the opening on the first surface 46 side facing inward. Such one or more injection holes 52 allow adhesive to be injected diagonally into the adhesive space 50 from the side of the sensor device body 14 and the outside of the frame-shaped base portion 34.

[0035] Furthermore, the base portion 34 has multiple nut-holding portions 54 formed thereon. Each of the multiple nut-holding portions 54 is shaped to protrude from the second surface 48, that is, towards the sensor device body 14. Each of the multiple nut-holding portions 54 is made of a resin such as plastic. One of the multiple nuts 40 is embedded inside each of the multiple nut-holding portions 54. In this embodiment, the base portion 34 has four nut-holding portions 54 formed thereon. Each of the four nut-holding portions 54 is provided at a corner of the base portion 34, which has a rectangular outer circumference. Each of the four nut-holding portions 54 is formed in a cylindrical shape with its central axis perpendicular to the plane of the metal plate 32.

[0036] Multiple nuts 40 are embedded in the nut holding portion 54 of the base portion 34 so that bolts can be screwed in from the second surface 48 side, i.e., the sensor device body 14 side. For example, the base portion 34 is integrally molded with the multiple nuts 40 by an insert molding method in which the multiple nuts 40 are held in a mold during molding.

[0037] In this embodiment, the connecting device 20 includes four nuts 40. Each of the four nuts 40 is embedded in one of the four nut holding parts 54. The central axis of the nut hole of each of the four nuts 40 coincides with the central axis of the cylindrical nut holding part 54. The second surface 48 side of the nut hole of each of the four nuts 40, i.e., the sensor device body 14, is exposed, and a bolt can be screwed in.

[0038] Figure 8 shows the connection device 20 attached to the sensor device body 14. The connection device 20, with the configuration shown in Figures 3 to 7, is attached to the housing of the sensor device body 14 by a plurality of nuts 40 and a plurality of fixing bolts 64. In this way, the connection device 20 is fixed with strong force to the housing of the sensor device body 14, which is made of resin such as plastic.

[0039] Figure 9 is a cross-sectional view showing the connection device 20 with adhesive injected into the adhesive space 50. In the connection device 20, the adhesive is injected into the adhesive space 50 within a concave portion, with the exposed portion and base portion 34 of the first surface 46 of the metal plate 32 as the bottom surface and the side wall 36 as the side surface.

[0040] An adhesive with good bonding compatibility to both the metal plate 32 and the concrete surface 11 is injected into the adhesive space 50. For example, if the material of the metal plate 32 is stainless steel, the adhesive is, as an example, a two-component acrylic adhesive containing an alkali-resistant additive (product name: Cemedyne® Y751). The adhesive may be made of other materials as long as it has good bonding compatibility to both the metal plate 32 and the concrete surface 11. Such adhesives with good bonding compatibility to both the metal plate 32 and concrete are relatively easy to obtain with short drying times. Therefore, the connecting device 20 can be easily attached to the concrete surface 11, which is the surface facing the ground.

[0041] Furthermore, the connecting device 20 can inject adhesive into the adhesive space 50 by inserting the nozzle of the injection device 62 into the injection hole 52. Therefore, the connecting device 20 can inject adhesive into the adhesive space 50 by inserting the nozzle of the injection device 62 into the injection hole 52 while it is in contact with the concrete surface 11. Consequently, the connecting device 20 can inject adhesive into the adhesive space 50 after its position and orientation relative to the concrete surface 11 has been determined. As a result, the connecting device 20 does not need to be attached to the concrete surface 11 by butting it against the concrete surface 11 after applying the adhesive, making the attachment work to the concrete surface 11 easier.

[0042] Furthermore, the injection holes 52 are formed at an angle to the vertical direction of the metal plate 32, with the opening on the second surface 48 side facing outwards and the opening on the first surface 46 side facing inwards. Therefore, when the connecting device 20 injects adhesive into the concrete surface 11, which is the surface facing the ground, using the injection tool 62, the worker can easily inject the adhesive from the underside of the concrete surface 11.

[0043] Furthermore, the adhesive space 50, due to the side walls 36 provided around the base portion 34, has a predetermined depth between the concrete surface 11 and the metal plate 32. As a result, a layer of adhesive of a predetermined thickness is formed on the side of the connecting device 20 facing the concrete surface 11. Therefore, even if there are irregularities on the surface of the concrete surface 11, the thickness of the adhesive injected into the adhesive space 50 absorbs the irregularities, allowing the connecting device 20 to be mounted parallel to the concrete surface 11. This enables the connecting device 20 to mount the sensor device body 14 to the concrete surface 11, even if there are irregularities on its surface, in the correct position and orientation, and with strong strength.

[0044] Figure 10 is a flowchart showing the installation method for attaching the sensor device 10 to the concrete surface 11. Figure 11 shows an example of an auxiliary jig 72 used in the installation of the sensor device 10. Figure 12 shows an example of the bonding process. Figure 13 shows another example of the bonding process.

[0045] The sensor device 10 is attached to the concrete surface 11 in the manner shown in Figure 10.

[0046] First, in S11, the worker performs a preparation step. In the preparation step, the worker attaches the first connecting device 21 and the second connecting device 22, which are positioned in the same positional relationship as their mounting positions to the sensor device body 14, to a rigid auxiliary jig 72 using fixing bolts 64 to each of the multiple nuts 40.

[0047] As shown in Figure 11, the auxiliary jig 72 has bolt holes formed such that the distance between the first connecting device 21 and the second connecting device 22 in the first direction, and the orientation of the first connecting device 21 and the second connecting device 22 are the same when attached to the sensor device body 14. This allows the worker to attach the first connecting device 21 and the second connecting device 22, which are positioned in the same positional relationship as when they are mounted on the sensor device body 14, to the auxiliary jig 72 using multiple nuts 40 and fixing bolts 64.

[0048] Next, in S12, the worker performs the bonding step. In the bonding step, with the first connecting device 21 and the second connecting device 22 fixed to the auxiliary jig 72, the worker bonds the first surfaces 46 of the first connecting device 21 and the second connecting device 22 to the concrete surface 11 with adhesive.

[0049] For example, as shown in Figure 12, in the bonding step, the worker injects adhesive into the adhesive space 50 with the first connecting device 21 and the second connecting device 22 abutting against the concrete surface 11. In this case, for example, the worker holds the auxiliary jig 72 to which the first connecting device 21 and the second connecting device 22 are attached and positions the first connecting device 21 and the second connecting device 22 at predetermined mounting positions on the concrete surface 11. Since the positional relationship between the first connecting device 21 and the second connecting device 22 is fixed by the auxiliary jig 72, the worker can relatively easily position the first connecting device 21 and the second connecting device 22 at predetermined mounting positions on the concrete surface 11. Subsequently, while fixing the first connecting device 21 and the second connecting device 22 in place at predetermined mounting positions on the concrete surface 11, the worker inserts the nozzle of the injection tool 62 into the injection hole 52 and injects adhesive into the respective adhesive spaces 50 of the first connecting device 21 and the second connecting device 22. This allows the worker to adhere the first surfaces 46 of the first connecting device 21 and the second connecting device 22 to the concrete surface 11 while the first connecting device 21 and the second connecting device 22 are attached to the auxiliary jig 72.

[0050] Furthermore, as shown in Figure 13, in the bonding step, the worker may inject adhesive into the adhesive space 50 in the first connecting device 21 and the second connecting device 22 before abutting the first connecting device 21 and the second connecting device 22 against the concrete surface 11. In this case, after the adhesive has been injected into the adhesive space 50, the worker abuts the first connecting device 21 and the second connecting device 22 against the concrete surface 11 to bond them. In this case, the worker can apply or drip the adhesive while holding the auxiliary jig 72 in their hand, making it easy to inject the adhesive into the adhesive space 50. Note that, as shown in Figure 13, when the adhesive is injected into the adhesive space 50 before abutting the first connecting device 21 and the second connecting device 22 against the concrete surface 11, the first connecting device 21 and the second connecting device 22 do not need to have injection holes 52 formed therein.

[0051] Next, in S13, the worker performs the curing step. In the curing step, the worker cures the adhesive while the first surfaces 46 of the first connecting device 21 and the second connecting device 22 are bonded to the concrete surface 11 with the adhesive. For example, the worker fixes the auxiliary jig 72 for a predetermined time with just enough force to prevent the first connecting device 21 and the second connecting device 22 from moving. Adhesives that have good adhesion compatibility with both the metal plate 32 and concrete have a relatively short drying time. Therefore, the worker can relatively easily fix the first connecting device 21 and the second connecting device 22 and cure the adhesive.

[0052] Next, in S14, the worker performs the removal step. In the removal step, the worker removes the auxiliary jig 72 from the first connecting device 21 and the second connecting device 22 by removing the fixing bolts 64 from each of the nuts 40. As a result, only the first connecting device 21 and the second connecting device 22 are connected to the concrete surface 11.

[0053] Next, in S15, the worker performs the installation step. In the installation step, the worker attaches the sensor device body 14 to the first connection device 21 and the second connection device 22 by screwing fixing bolts 64 to each of the multiple nuts 40. Since the first connection device 21 and the second connection device 22 are attached to the concrete surface 11 in the correct position and orientation using the auxiliary jig 72, the worker can attach the sensor device body 14 to the concrete surface 11 in the correct position and orientation by attaching the sensor device body 14 to the first connection device 21 and the second connection device 22.

[0054] According to the above mounting method, both the first connecting device 21 and the second connecting device 22 can be mounted to the concrete surface 11 in the correct position and orientation.

[0055] Figure 14 is a perspective view of the connection device 20 according to the first modified example, viewed from above. The sensor device 10 may include the connection device 20 according to the first modified example as shown in Figure 14. The shape of the side wall 36 of the connection device 20 according to the first modified example differs from the configuration shown in Figure 3.

[0056] In the first modified example, the side wall 36 has protrusions 82 with a height of a first length from the base portion 34 and recesses 84 with a height of less than the first length from the base portion 34, which are formed alternately along the outer circumference. By providing the side wall 36 with such alternating protrusions 82 and recesses 84, the connecting device 20 can be attached to the concrete surface 11 in an accurate position and orientation, even if the concrete surface 11 has irregularities, by positioning the protrusions of the concrete surface 11 to fit into the recesses 84 of the side wall 36.

[0057] Furthermore, the connecting device 20 according to the first modification may also include a double-sided adhesive tape 86. One adhesive surface of the double-sided adhesive tape 86 is adhered to a portion of the exposed area on the first surface 46 of the metal plate 32. For example, one adhesive surface of the double-sided adhesive tape 86 is adhered to approximately the center of the exposed area on the first surface 46 of the metal plate 32. In addition, the thickness of the double-sided adhesive tape 86 is greater than or equal to the length from the first surface 46 to the upper end of the side wall 36.

[0058] When the connecting device 20 is brought into contact with the concrete surface 11, the adhesive side of the double-sided adhesive tape 86 opposite to the adhesive side that adheres to the metal plate 32 adheres to the concrete surface 11. Therefore, the double-sided adhesive tape 86 can temporarily fix the connecting device 20 to the concrete surface 11 from the time the adhesive is injected into the adhesive space 50 until the adhesive dries. As a result, the connecting device 20 is securely fixed to the concrete surface 11 during the period when the adhesive is curing, and is attached to the concrete surface 11 with greater strength by the adhesive.

[0059] Figure 15 is a perspective view of the connection device 20 according to the second modified example, viewed from above. The sensor device 10 may include the connection device 20 according to the second modified example as shown in Figure 15.

[0060] In the second modified example, the connecting device 20 is provided with an elastic member 88 in the recess 84 of the side wall 36 according to the first modified example. The elastic member 88 is, for example, rubber. This allows the connecting device 20 to ensure that the protruding portion of the concrete surface 11 fits into the recess 84 of the side wall 36, and prevents the adhesive injected into the adhesive space 50 from leaking out of the recess 84.

[0061] Although embodiments of the present invention have been described above, these embodiments are presented as examples only and are not intended to limit the scope of the invention. Various modifications can be made to the embodiments. [Explanation of Symbols]

[0062] 10 Sensor device, 11 Concrete surface, 14 Sensor device body, 15 First component, 16 Second component, 17 Sensor, 20 Connection device, 21 First connection device, 22 Second connection device, 32 Metal plate, 34 Base part, 36 Side wall, 40 Nut, 42 Hole, 44 Notch, 46 First surface, 48 Second surface, 50 Adhesive space, 52 Injection hole, 54 Nut holder, 62 Injection tool, 64 Fixing bolt, 72 Auxiliary jig, 82 Protrusion, 84 Recess, 86 Double-sided adhesive tape, 88 Elastic component

Claims

1. A metal plate and A base portion that exposes a part of the first surface, which is one side of the metal plate, and holds the edge portion of the metal plate by sandwiching it from above and below in the thickness direction, A side wall is provided on the base portion so as to surround the exposed portion on the first surface, forming an adhesive space into which adhesive is injected, Multiple nuts are embedded in the base portion so that a bolt can be screwed in from the second surface opposite to the first surface, A connecting device equipped with the following features.

2. The base portion and the side wall are made of resin. The connecting device according to claim 1.

3. The base portion has a plurality of nut-holding portions formed on the side of the second surface, Each of the plurality of nut holding parts has one of the plurality of nuts embedded inside. The connecting device according to claim 1.

4. The base portion has one or more injection holes that penetrate from the second surface side into the adhesive space. A connecting device according to any one of claims 1 to 3.

5. The side wall is formed with alternating protrusions having a height of a first length from the base and recesses having a height less than the first length from the base. A connecting device according to any one of claims 1 to 4.

6. The side wall is provided with an elastic member in the recess. The connecting device according to claim 5.

7. The present invention further comprises a double-sided adhesive tape to which one adhesive surface is adhered to a portion of the exposed portion of the first surface, and whose thickness is equal to or greater than the length from the first surface to the upper end of the side wall. A connecting device according to any one of claims 1 to 5.

8. A mounting method for attaching a target device to a concrete surface using a first connecting device and a second connecting device, which are connecting devices according to any one of claims 1 to 7, The first connecting device is attached to the target device by each of the plurality of nuts and bolts, The second connecting device is attached to the target device by each of the plurality of nuts and bolts, The aforementioned mounting method is, A preparation step involves attaching the first and second connecting devices, which are positioned to a rigid auxiliary jig in the same positional relationship as the mounting position to the target device, to each of the plurality of nuts and bolts, The bonding step involves bonding the first surface of the first connecting device and the second connecting device to the concrete surface with the adhesive while they are attached to the auxiliary jig, With the first connecting device and the second connecting device in contact with the concrete surface, a curing step is performed to cure the adhesive, A removal step of removing the auxiliary jig from the first connecting device and the second connecting device, An attachment step of attaching the target device to the first connecting device and the second connecting device using the plurality of nuts and bolts, including Installation method.

9. In the bonding step, the adhesive is injected into the adhesive space while the first connecting device and the second connecting device are abutted against the concrete surface. The mounting method according to claim 8.

10. In the bonding step, Before abutting the first and second connecting devices against the concrete surface, the adhesive is injected into the adhesive space in the first and second connecting devices. After the adhesive is injected into the adhesive space, the first connecting device and the second connecting device are abutted against the concrete surface and bonded together. The mounting method according to claim 8.

11. A sensor device for measuring the displacement of a bridge, which is attached to a concrete surface of a bridge using a connecting device according to any one of claims 1 to 7, A sensor device body for detecting displacement in a first direction, The first and second connection devices, which are the aforementioned connection devices, Equipped with, The sensor device body is A first member and a second member that are movable relative to each other in the first direction, A sensor for detecting the displacement of the first member and the second member in the first direction, It has, The first connecting device is attached to the first member by each of the plurality of nuts and bolts, The second connecting device is attached to the second member by each of the plurality of nuts and bolts, The first and second connecting devices are attached to the bridge by adhesive such that the first direction in the sensor device body is parallel to the direction in which the displacement is measured in the bridge. Sensor device.

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