JP6847430B2 - Displacement measurement jig and displacement measurement method - Google Patents

Description

The present invention relates to a displacement measuring jig and a displacement measuring method used when measuring the displacement of a structure such as concrete or steel slab that constitutes a bridge or a passage.

When an abnormality such as a crack or misalignment is found in an infrastructure structure during regular inspections, it is necessary to continuously monitor the subsequent changes in symptoms and repair it at an appropriate time.

In order to monitor changes in the state of cracks and displacement of structures, it is important to accurately measure the displacement of structures. In addition, concrete structures such as bridges may crack in very narrow places, and it is assumed that it is difficult to use a large-scale displacement measuring device. Therefore, a small and simple measuring device or measuring jig is required. It has been demanded.

For example, as shown in FIG. 9A, a plurality of square tubular box culverts 14 made of RC concrete, PC concrete, or the like are prepared in a passage 12 such as a road or a waterway, and installed on a concrete foundation 16. And some are formed by connecting. Here, as shown in FIG. 9B, when a specific box culvert 14 (2) is displaced or tilted due to aging, the adjacent box culverts 14 (1) and 14 (2) are connected to the joint. A gap or the like may occur, and water may leak from the gap in the future. Therefore, when the manager of the passage 12 finds the joint abnormal portion 18 by periodic inspection or the like of the passage 12, it is necessary to monitor the displacement of the joint abnormal portion 18.

Conventionally, as a device or jig for measuring the displacement of a structure, as disclosed in Patent Document 1, a pair of measuring scales having a reference point at one end and a concrete structure at the other end of each measuring scale. There was a length change measuring device composed of a pair of support devices that were supported and fixed to the surface of the device. Each measuring scale is arranged in the length measuring direction of the concrete structure, and is supported and fixed with a pair of reference points in close proximity to each other. Then, the displacement of the concrete structure is measured by measuring the separation distance between the pair of reference points (points P1 and P2) using a micrometer or the like.

Further, as disclosed in Patent Document 2, there is a crack behavior stability measuring instrument for a concrete structure composed of a right-sided scale portion and a left-sided scale portion. The right scale part is a sub-scale body that is axially supported on the surface of a concrete structure and is projected from the right base toward the left, and has a scale on the front surface and a dovetail groove on the back surface. The left scale part has a left base that is axially supported on the surface of the concrete structure, a dovetail ridge projecting from the left base to the right, and a left base to the right. It has a main scale body that is projected toward the side and has a scale on the surface. In the right and left scales, the dovetail and the dovetail ridge are slidably fitted, and the right base is on the surface of the concrete structure (P1 point) via the right leg. The left base is pivotally attached to the surface (P2 point) of the concrete structure via the left leg. Further, the right leg and the left leg are provided with a scale for displaying the rotation angles of the right and left scales. According to this crack behavior stability measuring device, the displacement of the concrete structure is measured by reading the separation distance and the separation angle of the points P1 and P2 from the scale of each part.

Japanese Unexamined Patent Publication No. 2013-246108 Jikkenhei 6-22903 Gazette

However, in the case of the length change measuring device of Patent Document 1, although the change in the linear distance between the points P1 and P2 can be measured, measuring the change in the angle is not considered.

In the case of the crack behavior stability measuring device of Patent Document 2, the two-dimensional change of the linear distance and the angle between the P1 point and the P2 point can be measured, but the three-dimensional change cannot be measured. In addition, this crack behavior stability measuring instrument does not assume that the concrete structure is displaced three-dimensionally, and if it is displaced three-dimensionally, the axially attached portion may be damaged. Uses are quite limited.

As described above, the measuring devices or measuring instruments of Patent Documents 1 and 2 have many restrictions in use, and it is difficult to easily and accurately grasp the behavior of the structure.

The present invention has been made in view of the above background technology, and can easily and accurately measure the displacement of a structure by using a caliper or the like, and has a simple structure displacement measuring jig and displacement measurement. The purpose is to provide a method.

The present invention is a jig for measuring a change in the position of a second structure installed in the vicinity of the first structure with respect to the first structure, and the first and second structures. The structure has a flat substrate on which reference planes, which are side surfaces of each other, are arranged flush with each other in an installed state, and which is attached in contact with the reference plane of the first structure. With the substrate attached to the reference surface of the first structure, a part of the substrate faces the reference surface of the second structure, and the reference surface of the second structure of the substrate. This is a jig for measuring displacement, which is provided with a through hole for measuring a change in the distance between the substrate and the reference surface of the second structure at a position facing the above.

Further, the present invention is a jig for measuring a change in the position of the first and second structures with respect to the third structure provided in the vicinity of the first and second structures. In the installed state of the first, second and third structures , the reference planes which are the side surfaces of the first and second structures are arranged flush with each other, and the surface of the third structure is arranged. The reference planes are arranged in the direction intersecting the reference planes of the first and second structures, and are attached to the standing plates in the direction intersecting the reference planes of the third structure. With the upright plate attached to the reference surface of the third structure, a part of the upright plate faces the reference surface of the first and second structures, and the upright plate The upright plate and the reference plane of the first or second structure of the plate are located at a position facing the reference plane of the first structure and a position facing the reference plane of the second structure. This is a displacement measuring jig provided with through holes for measuring changes in distance. It is preferable that a plurality of the through holes are provided at positions separated from each other. Further, it is preferable that the upright plate is provided with an angle member having an L-shaped cross section.

Further, the present invention is a displacement measuring method for measuring a change in the position of a second structure installed in the vicinity of the first structure with respect to the first structure, wherein the first and second structures are described. In the installed state, the reference planes on the side surfaces of the structures are flush with each other, and a flat substrate is brought into contact with the reference planes of the first structure and attached to one of the substrates. The portion is made to face the reference surface of the second structure, and the substrate and the reference surface of the second structure are previously placed at positions of the substrate facing the reference surface of the second structure. A plurality of through holes for measuring the change in distance are provided, and for each of the plurality of through holes, the change in the distance between the substrate and the reference surface of the second structure is measured, and based on each measurement result, the change is measured. This is a displacement measuring method for calculating a change in the inclination of the second structure with respect to the first structure.

Further, the present invention is a displacement measuring method for measuring a change in the position of the first and second structures with respect to a third structure provided in the vicinity of the first and second structures. first, second and third structures, in the installed state, the side surface reference plane is the first and second structures are arranged flush, is the surface of the third structure The reference planes are arranged in a direction intersecting the reference planes of the first and second structures, and stand upright on the reference planes of the third structure in the direction intersecting the reference planes. A plate is attached, and a part of the upright plate is made to face the reference plane of the first and second structures, and the position of the upright plate facing the reference plane of the first structure and the said in advance. A plurality of through holes for measuring a change in the distance between the upright plate and the reference planes of the first and second structures are provided at positions facing the reference plane of the second structure. The change in the distance between the upright plate and the reference surface of the first structure is measured, and the change in the distance between the upright plate and the reference surface of the second structure is measured. Then, based on each measurement result, it is a displacement measurement method for calculating the change in the inclination of the first and second structures with respect to the third structure.

According to the displacement measuring jig and the displacement measuring method of the present invention , the displacement amount and the inclination amount, which are the relative position changes of a plurality of structures, can be easily and accurately measured by using a general caliper or the like. Can be measured. Further, the jig has a simple structure composed of a substrate and an upright plate, and can be manufactured at low cost by combining, for example, an angle material or the like.

The first embodiment of the displacement measuring jig of the present invention is a front view (a) and an enlarged front view (b) showing a state of being installed in the first and second structures. It is a perspective view (a) which shows the 1st jig which constitutes the displacement measurement jig of FIG. 1, and is the perspective view (b) which shows the 2nd jig. An enlarged front view (a) showing the measurement points when measuring the displacement of the second structure in the X direction with respect to the first structure, and an enlarged front view (b) showing the measurement points when measuring the displacement in the Z direction. ) 3 is a plan view (a) and an enlarged plan view (b) showing measurement points when measuring the displacement of the second structure with respect to the first structure in the Y direction. A front view (a) showing a state in which the second embodiment of the displacement measuring jig of the present invention is installed in the first, second and third structures, and a perspective view (b) showing the third jig. Is. 3 is a plan view (a) and an enlarged plan view (b) showing measurement points when measuring the displacement of the second structure in the Y direction with respect to the third structure. It is a front view (a) which shows the state which the other embodiment of the displacement measurement jig is installed in the third structure, and is the perspective view (b) which shows the displacement measurement jig of this embodiment. It is a front view which shows the state which attached the displacement measuring jig of this invention to the box culvert where the crack occurred. It is a perspective view (a) which shows the general passage formed by a box culvert, and the front view (b) which shows the appearance that a specific box culvert is displaced.

Hereinafter, the first embodiment of the displacement measuring jig of the present invention will be described with reference to FIGS. 1 to 4. The displacement measuring jig 10 of this embodiment is installed, for example, in a passage 12 of a concrete road or waterway provided in the ground or the like.

As shown in FIG. 9A, the passage 12 is formed by installing a plurality of square tubular box culverts 14 made of RC concrete, PC concrete, or the like on a concrete foundation 16 and connecting them. ing. In this embodiment, it is assumed that the specific box culvert 14 is displaced or tilted due to aging, and the joint abnormal portion 18 is found at the joint where the adjacent box culverts 14 are connected. As shown in (b), each side surface (first and second reference planes 20 (first and second reference planes 20) of the first and second structures 14 (1) and 14 (2) which are box culverts 14 in which the joint abnormal portion 18 is generated. A jig 10 for measuring displacement shall be attached to 1) and 20 (2)) to monitor the state of the joint abnormality portion 18.

Hereinafter, the configuration of the displacement measuring device 10 will be described. In the description, the left-right direction in FIGS. 1A and 1B is referred to as the X direction, the front-back direction (the direction perpendicular to the paper surface) is referred to as the Y direction, and the vertical direction is referred to as the Z direction.

The displacement measurement jig 10 includes a first jig 22 (1) attached to the first reference surface 20 (1) and a second jig 22 (2) attached to the second reference surface 20 (2). It is composed of and.

As shown in FIG. 2A, the first jig 22 (1) has a base plate 24 which is a substantially rectangular plate and a long angle member 26 having an L-shaped cross section, and has the same cross section. It is formed by integrally combining a short angle member 28.

The base plate 24 is provided with a pair of mounting holes 30a and 30b for mounting on the first reference surface 20 (1) at both ends in the longitudinal direction.

The angle member 26 has two surfaces 26a and 26b perpendicular to each other, is arranged so that the length direction is substantially perpendicular to the longitudinal direction of the base plate 24, and the end portion of one surface 26a is the base plate 24. It is stacked at a position close to the mounting hole 30a and fixed by the fixture 32. As a result, the other surface 26b stands at a right angle to the base plate 24. Further, a first through hole 34, which will be described later, is formed at the end of the surface 26a on the side protruding laterally from the base plate 24.

The angle member 28 has two surfaces 28a and 28b perpendicular to each other, and is arranged so that the length direction is substantially parallel to the longitudinal direction of the base plate 24, and one surface 28a is a mounting hole 22b of the base plate 22. It is stacked at a position close to, and is fixed by the fixture 32. As a result, the other surface 28b stands at a right angle to the base plate 24.

The portion where the base plate 24, the surface 26a of the angle member 26, and the surface 28a of the angle member 28 are integrated becomes the first substrate 38 of the first jig 22 (1). Then, as shown in FIG. 1 (b), the first substrate 38 is arranged at a position close to the joint abnormality portion 18 of the first structure 14 (1), and the longitudinal direction of the base 24 is parallel to the Z direction. It is brought into contact with the first reference surface 20 (1) so as to be fixed to the mounting holes 30a and 30b through the fixture 36. At this time, the portion of the angle member 26 provided with the first through hole 34 projects laterally beyond the joint abnormal portion 18.

The surface 26b of the angle member 26 becomes the first horizontal upright plate 26b of the first jig 22 (1) and stands upright in the direction perpendicular to the first substrate 38 (Y direction). Further, the surface 28b of the angle member 28 becomes the first vertical upright plate 28b of the first jig 22 (1), stands upright in the direction perpendicular to the first substrate 38 (Y direction), and is the first horizontal upright plate. It is arranged in a direction substantially perpendicular to 26b.

As shown in FIG. 2B, the second jig 22 (2) has a base plate 40 having substantially the same outer shape as the base plate 24 and angle members 42 and 44 having substantially the same outer shape as the angle material 28. It is formed by combining them together.

The base plate 40 is provided with a pair of mounting holes 46a and 46b for mounting on the second reference surface 20 (2) at both ends in the longitudinal direction.

The angle member 42 has two surfaces 42a and 42b perpendicular to each other, and is arranged so that the length direction is substantially perpendicular to the longitudinal direction of the base plate 40, and one surface 42a is the mounting hole 46b of the base plate 40. It overlaps at a position close to. As a result, the other surface 42b stands upright at a substantially right angle to the base plate 40.

The angle member 44 has two surfaces 44a and 44b perpendicular to each other, and is arranged so that the length direction is substantially parallel to the longitudinal direction of the base plate 40, and one surface 44a forms the surface 42a of the angle member 42. It is stacked on the base plate 40 via the fixture, and in this state, it is integrally fixed by the fixture 32. As a result, the other surface 44b stands at a substantially right angle to the base plate 40.

The portion where the base 40, the surface 42a of the angle member 42, and the surface 44a of the angle member 44 are integrated becomes the second substrate 48 of the second jig 22 (2). Then, as shown in FIG. 1B, the second substrate 48 is arranged at a position close to the joint abnormality portion 18 of the second structure 14 (2), and the longitudinal direction of the base plate 40 is parallel to the Z direction. It is brought into contact with the second reference surface 20 (2) so as to be so as to be fixed to the mounting holes 46a and 46b through the fixture 36.

The surface 42b of the angle member 42 becomes the second horizontal upright plate 42b of the second jig 22 (2), stands upright in the direction perpendicular to the second substrate 48 (Y direction), and is designated as the first horizontal upright plate 26b. Oppose at a distance of. The surface 44b of the angle member 44 becomes the second vertical upright plate 44b of the second jig 22 (2), stands upright in the direction perpendicular to the second substrate 48 (Y direction), and forms on the second horizontal upright plate 42b. It is arranged in a substantially right-angled direction with respect to the first vertical upright plate 28b and faces the first vertical standing plate 28b at a predetermined distance.

In the state shown in FIG. 1B, the portion of the first through hole 34 of the first substrate 38 faces the portion of the base plate 40 near the mounting hole 46a with a predetermined distance. When it is desired to adjust this separation distance to an appropriate value, for example, the thickness of the base plate 24 or the base plate 40 may be changed or a spacer may be sandwiched.

Further, the portion of the first through hole 34 of the first substrate 38 faces the second reference surface 20 (2) via the second substrate 48. The first through hole 34 is a through hole for measuring a change in the separation distance between the first substrate 38 and the second reference surface 20 (2) using the depth bar Nd of the caliper N. Therefore, the size of the first through hole 34 is set so that the depth bar Nd can be inserted inward and the end face of the main scale Nh can be locked at the peripheral edge of the hole.

Next, a method of measuring the displacement of the second structure 14 (2), which is a change in the position of the second structure 14 (2) with respect to the first structure 14 (1), using the displacement measuring jig 10 will be described.

As shown in FIG. 3A, the displacement amount Δx of the second structure 14 (2) in the X direction is such that the separation distance x between the first vertical standing plate 28b and the second vertical standing plate 44b is set to that of the caliper N. It can be detected by measuring with a caliper Nz and calculating the difference from the previous measured value. As shown in FIG. 3B, the displacement amount Δz of the second structure 14 (2) in the Z direction is such that the distance z between the first horizontal standing plate 26b and the second horizontal standing plate 42b is the distance z of the caliper N. It is detected by measuring with a caliper Nz and calculating the difference from the previous measured value.

Further, although not shown in FIGS. 3A and 3B, for example, if the displacement amount Δx is detected at two different locations of the first vertical standing plate 28b and the second vertical standing plate 44b, the displacement amount Δx is based on this. The amount of inclination of the second structure 14 (2) can be calculated. Alternatively, if the displacement amounts Δz at two different locations of the first horizontal upright plate 26b and the second horizontal upright plate 42b are detected, the inclination amount of the second structure 14 (2) can be calculated based on this. ..

Further, as shown in FIGS. 4A and 4B, the displacement amount Δy of the second structure 14 (2) in the Y direction is the first substrate 38 (the surface 26a of the angle member 26) and the second substrate. The separation distance y of 48 (base plate 40) is measured by inserting the depth bar Nd of the caliper N into the first through hole 34, and is detected by calculating the difference from the previous measured value.

Further, although not shown in FIGS. 4A and 4B, if first through holes 34 are provided in advance at a plurality of locations on the surface 26a of the angle member 26 and the displacement amount Δy is detected at the plurality of locations, the displacement amount Δy can be detected. The amount of inclination of the second structure 14 (2) can be calculated.

As described above, according to the displacement measuring jig 10, the displacement of the second structure 14 (2) with respect to the first structure 14 (1) can be easily measured using the caliper N. .. Moreover, the three-dimensional displacement amount and inclination amount (or displacement angle) of the structure can be accurately detected by performing appropriate arithmetic processing based on the measurement results at a plurality of locations. Further, in the case of the crack behavior stability measuring instrument of Patent Document 2, if the structure is displaced in an unexpected direction, the measuring instrument may be damaged, but in the case of the displacement measuring jig 10, it is displaced in any direction. But it doesn't really matter. Further, since the first and second jigs 22 (1) and 22 (2) have a simple structure in which angle materials and the like are combined, they can be manufactured at a very low cost.

Next, a second embodiment of the displacement measuring jig of the present invention will be described with reference to FIGS. 5 and 6. Here, the same configurations as those in the above embodiment are designated by the same reference numerals, and the description thereof will be omitted. In the displacement measuring jig 50 of this embodiment, similarly to the above, the first and second structures 14 (1) and 14 (2), which are the two box culverts 14 constituting the passage 12, are displaced or tilted. Used to monitor the progress of the.

As shown in FIG. 5A, the displacement measurement jig 50 includes the first jig 22 (1) attached to the first reference surface 20 (1) of the first structure 14 (1). It is provided with a second jig 22 (2) attached to the second reference surface 20 (2) of the second structure 14 (2), and further on the surface of the third structure 16 (concrete foundation 16). It is provided with a third jig 22 (3) attached to a third reference surface 20 (3). Since the first and second jigs 22 (1) and 22 (2) are the same as those described above, the third jig 22 (3) will be described in detail below.

As shown in FIG. 5B, the third jig 22 (3) is formed of an angle member 52 having an L-shaped cross section, and has two surfaces 52a and 52b perpendicular to each other. One surface 52a is a portion of the third jig 22 (3) that serves as the third substrate 52a, and mounting holes 54a and 54b for mounting on the third reference surface 20 (3) are provided at both ends in the length direction. It is provided as a pair. The other surface 52b is a portion of the third jig 22 (3) that serves as the third upright plate 52b, and has four third through holes 56 (1) to 56 at predetermined intervals in the length direction. (4) is provided.

As shown in FIG. 6A, the third substrate 52a is arranged at a position close to the joint abnormal portion 18 of the first and second structures 14 (1) and 14 (2), and the length direction is X. It is brought into contact with the third reference surface 20 (3) so as to be parallel to the direction, and is fixed through the fixtures 36 through the mounting holes 54a and 54b. The third upright plate 52b stands upright in the direction perpendicular to the third substrate 52a (Z direction), and the portion provided with the third through holes 56 (1) and 56 (2) is the first reference surface 20 (1). The portions provided with the third through holes 56 (3) and 56 (4) face the second reference surface 20 (2) at a predetermined distance.

The third through holes 56 (1) and 56 (2) are through holes for measuring the change in the separation distance between the third substrate 52a and the first reference surface 20 (1) using the depth bar Nd of the caliper N. Is. Further, the third through holes 56 (3) and 56 (4) are for measuring the change in the separation distance between the third substrate 52a and the second reference surface 20 (2) using the depth bar Nd of the caliper N. It is a through hole. Therefore, for each size of the third through holes 56 (1) to 56 (4), the depth bar Nd can be inserted inward, and the end face of the main scale Nh can be locked at the peripheral edge of each hole. Is set.

Next, a method of using the displacement measurement jig 50 will be described. The first and second jigs 22 (1) and 22 (2) are used to measure the displacement of the second structure 14 (2) with respect to the first structure 14 (1), and the measurement thereof. The method is the same as above. The newly provided third jig 22 (3) is used to measure the displacement of the first and second structures 14 (1) and 14 (2) in the Y direction with respect to the third structure 16. used.

As shown in FIG. 6B, the displacement amount Δy2 of the second structure 14 (2) with respect to the third structure 16 in the Y direction is the third upright plate 52b and the second reference plane 20 (2). The separation distance y2 is measured by inserting the depth bar Nd of the caliper N into the third through holes 56 (3) and 56 (4), and is detected by calculating the difference from the previous measured value. Further, the amount of inclination of the second structure 14 (2) can be calculated by detecting the amount of displacement Δy2 at two different locations.

Similarly, the displacement amount Δy1 of the first structure 14 (1) with respect to the third structure 16 in the Y direction sets the distance y1 between the third standing plate 52b and the first reference surface 20 (1) as a caliper. It is measured by inserting the depth bar Nd of N into the third through holes 56 (1) and 56 (2), and is detected by calculating the difference from the previous measured value. Further, the amount of inclination of the first structure 14 (2) can be calculated by detecting the amount of displacement Δy1 at two different locations.

As described above, the displacement measuring jig 50 is a configuration in which the third jig 22 (3) is added to the configuration of the displacement measuring jig 10. Therefore, the same excellent effect as the displacement measurement jig 10 can be obtained, and further, the first and second structures 14 (1), 14 ( The displacement of the third structure 16 in the Y direction in 2) can also be measured easily and accurately.

Next, embodiments of other displacement measurement jig will be described with reference to FIG. Here, the same configuration as that of the above embodiment will be described with the same reference numerals. As shown in FIG. 7A, the displacement measuring jig 58 of this embodiment is the third structure of the fourth structure 14 (4), which is one of the plurality of box culverts 14. It is used to detect displacement with respect to 16 (concrete foundation 16) and is attached to a third reference plane 20 (3), which is the surface of the third structure 16.

As shown in FIG. 7B, the displacement measuring jig 58 is formed of an angle member 52 having an L-shaped cross section perpendicular to the length direction, and has two surfaces 52a and 52b perpendicular to each other. Have. One surface 52a is a portion of the displacement measuring jig 58 that serves as the third substrate 52a, and a pair of mounting holes 54a and 54b for mounting on the third reference surface 20 (3) are provided at both ends in the length direction. It is provided. The other surface 52b is a portion of the third jig 22 (3) that serves as the third upright plate 52b, and has two third through holes 56 (1) and 56 at predetermined intervals in the length direction. (2) is provided.

The third substrate 52a is arranged at a position close to the fourth reference surface 20 (4) on the side surface of the fourth structure 14 (4), and the third reference surface 20 is arranged so that the length direction is parallel to the X direction. It is brought into contact with (3) and fixed to the mounting holes 54a and 54b through the fixture 36. The third upright plate 52b stands upright in the direction perpendicular to the third substrate 52a (Z direction) and faces the fourth reference plane 20 (4) at a predetermined distance.

The third through holes 56 (1) and 56 (2) are through holes for measuring the change in the separation distance between the third substrate 52a and the fourth reference surface 20 (4) using the depth bar Nd of the caliper N. Is. Therefore, for each size of the third through holes 56 (1) and 56 (2), the depth bar Nd can be inserted inward, and the end face of the main scale Nh can be locked at the peripheral edge of each hole. It is set.

The method of using the displacement measuring jig 58 is the same as that of the third jig 22 (3) described above. The displacement measuring jig 58 is a jig suitable for, for example, when it is assumed that the fourth structure 14 (4) is displaced only in the Y direction, and is a jig of the fourth structure 14 (4). , The displacement in the Y direction with respect to the third structure 16 can be measured easily and accurately.

The displacement measuring jig of the present invention is not limited to the above embodiment. In the above description of the configuration and usage of the first and second jigs 22 (1) and 22 (2), each jig is a side surface of the first and second structures 14 (1) and 14 (2). Although it is assumed that the case is attached to the ceiling surface or the floor surface of the first and second structures 14 (1) and 14 (2). In addition, it can be used by attaching it to a surface inclined with respect to the ground.

Further, when the surface condition of the structure to be measured is good, the first vertical upright plate and the first horizontal upright plate are not provided on the surface of the measurement target without providing the first substrate, the second substrate, and the third substrate. , The second vertical upright plate, the second horizontal upright plate, and the third upright plate may be directly attached. When the first to third substrates are provided, it is preferable to use an angle material, but a member other than the angle material may be used. The material of each plate is not particularly limited, but a metal plate or a hard resin plate having a certain strength and weather resistance is preferable.

As shown in FIG. 8, the displacement amount measuring jig 10 can also be used to monitor the progress of cracks generated on the side surface or the like of one box culvert 14. In this case, for example, the lower portion of the cracked portion 60 is the first structure 62 (1), the upper portion is the second structure 62 (2), and the first structure 62 (1) is the second. By attaching one jig 22 (1) and attaching the second jig 22 (2) to the second structure 62 (2), the same measurement as described above can be performed.

Further, the first to fourth structures in which the displacement amount measuring jig is used may be structures other than the box culverts and concrete foundations constituting the passage, and concrete such as tunnel lining is cast on site for construction. The structure may be a structure, and the type thereof is not particularly limited. For example, it can be used for displacement measurement of various infrastructure structures such as monitoring the relative displacement between the concrete legs of a bridge and the steel deck, and monitoring the cracks generated in the concrete wall in the tunnel.

10, 50, 58 Displacement measurement jig 14 Box culvert 14 (1), 62 (1) First structure (box culvert)
14 (2), 62 (2) Second structure (box culvert)
14 (4) Fourth structure (box culvert)
16 Third structure (concrete foundation)
20 (1) First reference surface 20 (2) Second reference surface 20 (3) Third reference surface 20 (4) Fourth reference surface 22 (1) First jig 22 (2) Second jig 22 ( 3) Third jig 26, 28, 42, 44, 52 Angle material 26b First horizontal upright plate 28b First vertical upright plate 34 First through hole 38 First substrate 42b Second horizontal upright plate 44b Second vertical upright plate 48 Second substrate 52a Third substrate 52b Third standing plate 56 (1), 56 (2), 56 (3), 56 (4) Third through hole N Nogisu Nd Depth bar

Claims (6)

A jig for measuring a change in the position of a second structure installed in the vicinity of the first structure with respect to the first structure.
It has a flat substrate that is attached in contact with the side surface of the first structure.
Opposite in a state where the substrate is attached to a side surface of the first structure, a portion of the substrate is opposed to the side surface of the second structure, the substrate, on the side surface of the second structure A jig for measuring displacement, characterized in that a through hole for measuring a change in the distance between the substrate and the side surface of the second structure is provided at the position where the substrate is formed. A jig for measuring a change in the position of the first and second structures with respect to a third structure provided in the vicinity of the first and second structures.
It has an upright plate that is mounted in a direction intersecting the surface of the third structure.
With the upright plate attached to the surface of the third structure, a part of the upright plate faces each side surface of the first and second structures, and the first of the upright plates. in a position facing the side surface of position and the second structure opposite to the side of one structure, to measure the change in distance between the side surface of the upright plate and the first or second structure A displacement measuring jig characterized in that each through hole is provided. The displacement measuring jig according to claim 2, wherein the upright plate is formed of an angle member having an L-shaped cross section. The displacement measuring jig according to any one of claims 1 to 3, wherein a plurality of through holes are provided at positions separated from each other. A displacement measuring method for measuring a change in the position of a second structure installed in the vicinity of the first structure with respect to the first structure.
A flat substrate is abutted against the side surface of the first structure and attached, and a part of the substrate is made to face the side surface of the second structure. A plurality of through holes for measuring the change in the distance between the substrate and the side surface of the second structure are provided at positions facing the side surfaces.
The change in the distance between the substrate and the side surface of the second structure is measured for each of the plurality of through holes, and the inclination of the second structure with respect to the first structure is based on each measurement result. A displacement measuring method characterized by calculating a change in. A displacement measuring method for measuring a change in the position of the first and second structures with respect to a third structure provided in the vicinity of the first and second structures.
Wherein the surface of the third structure, the standing plate mounting in the direction crossing respect to the surface, a portion of the upright plate, is opposed to each side of said first and second structures, in advance, the distance between the side surface of the raised plate, in a position facing the side surface of position and the second structure opposite to the side surface of the first structure, the standing plate and the first and second structures Multiple through holes are provided to measure the change in
For each of the plurality of through holes, the change in the distance between the upright plate and the side surface of the first structure is measured, and the change in the distance between the upright plate and the side surface of the second structure is measured. Then, based on each measurement result, the displacement measuring method is characterized in that the change in the inclination of the first and second structures with respect to the third structure is calculated.

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