JP2019124709A - Displacement measurement jig and displacement measurement method - Google Patents

Abstract

To provide a displacement measurement jig and displacement measurement method that can readily and precisely a displacement of a structure using a vernier caliper and the like, and are simply structured.SOLUTION: A substrate 38 is provided in a reference surface 20(1) of one structure 14(1), one part of the substrate 38 provided in the one structure 14(1) faces a reference surface 20(2) of other structure 14(2), and a through-hole 34 for measuring a distance between the substrate 38 and the reference surface 20(2) of the other structure 14(2) is provided in the substrate 38 facing the reference surface 20(2) of the other structure 14(2). By the through-hole 34, the distance between the substrate 38 and the reference surface 20(2) of the other structure 14(2) is measured. On the basis of the distance between the reference surface 20(2) of the other structure 14(2) and the substrate 38 by a plurality of through-holes 34, a tilt of the other structure 14(2) to the one structure 14(1) is calculated.SELECTED DRAWING: Figure 1

Description

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

  In the case of an infrastructure structure, when an abnormality such as a crack or a gap is found in a regular inspection, it is necessary to continuously monitor changes in symptoms thereafter and repair it at an appropriate time.

  It is important to accurately measure the displacement of the structure in order to monitor changes in the state of cracking and displacement of the structure. In concrete structures such as bridges, cracks may occur in very narrow places, and large displacement measurement devices are difficult to use, so a small and simple measurement device or measuring jig It has been demanded.

  For example, as shown in FIG. 9A, a plurality of box-shaped box culverts 14 made of RC concrete, PC concrete or the like are prepared in the passage 12 such as a road or water channel, and installed on the concrete foundation 16 And some are formed by linking. Here, as shown in FIG. 9 (b), when a particular box culvert 14 (2) is shifted or inclined due to secular change, adjacent box culverts 14 (1) and 14 (2) are connected to each other. A gap or the like may occur, from which water leakage may occur in the future. Therefore, when the manager of the passage 12 discovers the joint abnormal portion 18 by periodic inspection of the passage 12 or the like, it is necessary to monitor the displacement of the joint abnormal portion 18.

  Conventionally, as an apparatus or jig for measuring the displacement of a structure, as disclosed in Patent Document 1, a pair of measuring scales having a marking point at one end, and the other end of each measuring scale are made of a concrete structure There has been a length change measuring device constituted by a pair of supporting devices supported and fixed on the surface of the. Each measuring scale is disposed in the direction of measuring the length of the concrete structure, and is supported and fixed in a state in which a pair of reference points are brought close to each other. And the displacement of a concrete structure is measured by measuring the separation distance of a pair of control points (P1 point, P2 point) using a micrometer etc.

  Further, as disclosed in Patent Document 2, there has been a crack behavior stability measuring device for a concrete structure configured of a right square and a left square. The right-hand measure is a right-handed base pivotally supported on the surface of the concrete structure, and a left-handed protrusion from the right-handed base, and a scale with a scale on the surface and a dovetail formed on the back And the left measure portion has a left base supported pivotally on the surface of the concrete structure, a dovetail ridge projecting rightwardly from the left base, and a right from the left base Protruding toward the direction, the surface is marked with a scale, and has a main scale. The right base and the left base are the surface of the concrete structure (P1 point) with the right base through the right leg with the dovetail and the dovetail ridge slidably fitted And the left base is pivoted to the surface (point P2) of the concrete structure via the left leg. Further, on the right leg and the left leg, a scale is attached to indicate the rotation angle of the right and left length portions. According to this crack behavior stability measuring device, the displacement of the concrete structure is measured by reading the distance between the point P1 and the point P2 and the angle at which the point is separated from the scale of each part.

JP, 2013-246108, A Japanese Utility Model Application Publication No. 6-22903

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

  In the case of the crack behavior stability measuring device of Patent Document 2, two-dimensional changes in the linear distance and angle between the point P1 and the point P2 can be measured, but three-dimensional changes can not be measured. In addition, this crack behavior stability measuring device is a structure in which the concrete structure is not assumed to be displaced three-dimensionally, and the three-dimensionally displaced may cause breakage of the bearing portion. The application is quite limited.

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

  The present invention has been made in view of the above background art, and the displacement of a structure can be easily and accurately measured using a caliper or the like, and the displacement measurement jig and displacement measurement of a simple structure Intended to provide a method.

  The present invention is a jig for measuring the displacement of structures which are close to each other, and an upright plate is provided in a direction intersecting with a reference surface of one of the structures, and provided on the one of the structures. A part of the rising plate faces the reference surface of the other structure, and the distance between the rising plate and the reference surface of the other structure to the rising plate facing the reference surface of the other structure It is a jig for displacement measurement provided with a through hole for measuring.

  It is preferable that a plurality of the through holes are provided at mutually separated positions. Moreover, it is preferable that the said standing board is provided by the angle material of a cross-sectional L-shape.

  The present invention is also a displacement measurement method for measuring the displacement of adjacent structures, wherein a substrate is provided on the reference surface of one of the structures, and a part of the substrate provided on the one of the structures is the other. A plurality of through holes for measuring the distance between the upstanding plate and the reference surface of the other structure are provided on the substrate facing the reference surface of the structure and facing the reference surface of the other structure. The distance between the substrate and the reference surface of the other structure is measured for each of the plurality of through holes, based on the distance of the substrate to the reference surface of the other structure in the plurality of through holes. It is a displacement measuring method which computes the inclination of the above-mentioned other structure to the above-mentioned one structure.

  The present invention is also a displacement measurement method for measuring the displacement of structures which are close to each other, wherein an upright plate is provided in a direction intersecting with the reference surface of one of the structures, and provided on the one structure. A part of the standing plate faces the reference surface of the other structure, and the standing plate facing the reference surface of the other structure measures the distance between the standing plate and the reference surface of the other structure. A plurality of through holes for measurement are provided, and the distance between the upstanding plate and the reference surface of the other structure is measured for each of the plurality of through holes, and the other structure in the plurality of through holes is measured. It is the displacement measurement method which calculates the inclination of the said other structure with respect to the said one structure based on the distance of the said standing board with respect to a reference plane.

  According to the jig for displacement measurement and displacement measurement method of the present invention, relative displacement and inclination of a plurality of structures can be easily and accurately measured using a common caliper or the like. . The jig is a simple structure consisting of a substrate and a standing plate, and can be manufactured inexpensively by combining, for example, angle members and the like.

They are a front view (a) and an enlarged front view (b) which show the state in which the 1st embodiment of the jig for displacement measurement of the present invention was installed in the 1st and 2nd structures. It is a perspective view (a) which shows the 1st jig | tool which comprises the jig | tool for displacement measurement of FIG. 1, and a perspective view (b) which shows a 2nd jig | tool. An enlarged front view (a) showing measurement points when measuring the displacement of the second structure with respect to the first structure in the X direction (a), an enlarged front view showing measurement points when measuring the displacement in the Z direction (b ) They are a top view (a) which shows the measurement point at the time of measuring the displacement of the Y direction with respect to the 1st structure of a 2nd structure, and an enlarged plan view (b). The front view (a) which shows the state in which 2nd embodiment of the jig | tool for displacement measurement of this invention was installed in the 1st, 2nd and 3rd structure, The perspective view which shows a 3rd jig (b) It is. They are a top view (a) which shows the measurement point at the time of measuring the displacement of the Y direction with respect to the 3rd structure of a 2nd structure, and an enlarged plan view (b). The front view (a) which shows the state which 3rd embodiment of the jig | tool for displacement measurement of this invention was installed in the 3rd structure, The perspective view (b) which shows the jig | tool for displacement measurement of this embodiment is there. It is a front view which shows the state which attached the jig | tool for displacement measurement of this invention to the box culvert which the crack generate | occur | produced. It is a perspective view (a) which shows the general channel | path formed of the box culvert (a), and a front view (b) which shows a mode that the specific box culvert shifted.

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

  The passage 12 is formed by installing and connecting a plurality of box-shaped box culverts 14 made of RC concrete, PC concrete or the like on the concrete foundation 16 as shown in FIG. 9A. ing. In this embodiment, it is assumed that a specific box culvert 14 is shifted or inclined due to secular change, and a joint abnormal portion 18 is found at a joint where adjacent box culverts 14 are connected, as shown in FIG. As shown in (b), the side surfaces of the first and second structures 14 (1) and 14 (2) (the first and second reference surfaces 20 1) and 20 (2), the displacement measurement jig 10 is attached, and the state of the joint abnormal portion 18 is monitored.

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

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

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

  The angled member 26 has two faces 26a and 26b which are perpendicular to each other, and the length direction is arranged to be substantially perpendicular to the longitudinal direction of the base plate 24, and the end of one face 26a is the base plate 24. It is overlapped at a position close to the mounting hole 30 a and fixed by a fixing tool 32. As a result, the other surface 26 b stands substantially at right angles to the base plate 24. Further, a first through hole 34 to be described later is formed at an end of the surface 26 a on the side projecting laterally from the base plate 24.

  The angle member 28 has two faces 28 a and 28 b perpendicular to each other, and is disposed so that the length direction is substantially parallel to the longitudinal direction of the base plate 24, and one face 28 a is a mounting hole 22 b of the base plate 22. And is fixed by a fixture 32. As a result, the other surface 28 b stands substantially at right angles to the base plate 24.

  A portion where the base plate 24, the surface 26 a of the angle member 26, and the surface 28 a of the angle member 28 are integrated becomes a first substrate 38 of the first jig 22 (1). And as shown in FIG.1 (b), the 1st board | substrate 38 is arrange | positioned in the position near the joint abnormal part 18 of 1st structure 14 (1), and the longitudinal direction of the base 24 is parallel to Z direction. The first reference surface 20 (1) is abutted against the first reference surface 20 (1) and fixed to the mounting holes 30a and 30b through the fixing tool 36. At this time, the portion of the angle member 26 provided with the first through hole 34 protrudes laterally beyond the joint abnormal portion 18.

  The surface 26 b of the angle member 26 becomes a first horizontal rising plate 26 b of the first jig 22 (1), and stands in a direction perpendicular to the first substrate 38 (Y direction). Furthermore, the surface 28b of the angle member 28 becomes a first vertically rising plate 28b of the first jig 22 (1), and stands in a direction perpendicular to the first substrate 38 (Y direction) It is disposed substantially at right angles to 26b.

  As shown in FIG. 2B, the second jig 22 (2) includes 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 member 28. It is formed by combining together.

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

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

  The angle member 44 has two surfaces 44a and 44b which are perpendicular to each other, and the length direction is disposed substantially parallel to the longitudinal direction of the base plate 40, and one surface 44a is the surface 42a of the angle member 42. It is superimposed on the base plate 40 and fixed integrally by the fixture 32 in this state. As a result, the other surface 44 b stands substantially at right angles to the base plate 40.

  A 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 disposed at a position near the joint abnormal portion 18 of the second structure 14 (2), and the longitudinal direction of the base plate 40 is parallel to the Z direction. The second reference surface 20 (2) is abutted against the second reference surface 20 (2) and fixed to the mounting holes 46 a and 46 b through the fixing tool 36.

  The surface 42b of the angle member 42 becomes the second horizontal rising plate 42b of the second jig 22 (2), stands in the direction perpendicular to the second substrate 48 (Y direction), and the first horizontal rising plate 26b Opposite each other at a distance. The surface 44b of the angle member 44 becomes a second vertically rising plate 44b of the second jig 22 (2), and stands in a direction perpendicular to the second substrate 48 (Y direction), and the second horizontally rising plate 42b It is disposed substantially at right angles to the first vertical standing plate 28b and faces the first vertically rising 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 near the mounting hole 46 a of the base plate 40 with a predetermined distance therebetween. When it is desired to adjust the 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 interposed.

  In addition, the portion of the first through hole 34 of the first substrate 38 faces the second reference surface 20 (2) with the second substrate 48 interposed therebetween. The first through hole 34 is a through hole for measuring the change of 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 such that the depth bar Nd can be inserted inside and the end face of the scale Nh can be locked at the periphery of the hole.

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

  The displacement amount Δx in the X direction of the second structure 14 (2) is, as shown in FIG. 3A, the separation distance x between the first vertical standing plate 28 b and the second vertical standing plate 44 b It can be detected by measuring with the jaw Nz and calculating the difference from the previous measured value. The displacement amount Δz of the second structure 14 (2) in the Z direction is, as shown in FIG. 3 (b), the separation distance z of the first horizontal rising plate 26 b and the second horizontal rising plate 42 b Measure by Jaw Nz and detect by calculating the difference from the previous measurement value.

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

  Furthermore, 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 the base plate 40 (48) is measured by inserting a depth bar Nd of vernier caliper N into the first through hole 34, and detected by calculating the difference from the previous measurement value.

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

  As described above, according to the displacement measurement 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. . In addition, by performing appropriate arithmetic processing based on measurement results at a plurality of locations, it is possible to accurately detect the three-dimensional displacement amount and inclination amount (or displacement angle) of the structure. Further, in the case of the crack behavior stability measuring instrument of Patent Document 2, there is a possibility that the measuring instrument may be damaged if the structure is displaced in an unexpected direction, but in the case of the displacement measuring jig 10, it is displaced in any direction. But it hardly matters. Furthermore, since the first and second jigs 22 (1) and 22 (2) have a simple structure in which angle members and the like are respectively combined, they can be manufactured at very low cost.

  Next, a second embodiment of the displacement measuring jig of the present invention will be described based on FIG. 5 and FIG. Here, the same configuration as that of the above embodiment is given the same reference numeral and the description is omitted. The displacement measuring jig 50 of this embodiment is, as described above, the displacement or inclination of the first and second structures 14 (1), 14 (2) which are the two box culverts 14 constituting the passage 12. Used to monitor the progress of

  The displacement measurement jig 50 is, as shown in FIG. 5A, a first jig 22 (1) attached to the first reference surface 20 (1) of the first structure 14 (1), And 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) A third jig 22 (3) attached to a certain third reference surface 20 (3) is provided. Since the first and second jigs 22 (1) and 22 (2) are the same as 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 to be the third substrate 52a of the third jig 22 (3), and mounting holes 54a, 54b for attaching to the third reference surface 20 (3) are provided at both ends in the longitudinal direction. It is provided in a pair. Further, the other surface 52b is a portion to be the third standing plate 52b of the third jig 22 (3), and a predetermined interval is provided in the length direction, and the four third through holes 56 (1) to 56 (4) is provided.

  The third substrate 52a is disposed at a position close to the joint abnormal portion 18 of the first and second structures 14 (1) and 14 (2) as shown in FIG. 6A, and the length direction is X It abuts on the third reference surface 20 (3) so as to be parallel to the direction, and is fixed to the mounting holes 54a, 54b through the fixing tool 36. The third standing plate 52b stands 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 plane 20 (1). The third through holes 56 (3) and 56 (4) are opposed to each other at a predetermined distance, and are opposed to the second reference surface 20 (2).

  The third through holes 56 (1), 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. It is. Further, the third through holes 56 (3), 56 (4) are for measuring the change of 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, each size of the third through holes 56 (1) to 56 (4) can insert the depth bar Nd inward and lock the end face of the main length Nh at the peripheral edge of each hole It is set up.

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

  As shown in FIG. 6B, the displacement Δy 2 in the Y direction of the second structure 14 (2) with respect to the third structure 16 is the third rising plate 52 b and the second reference surface 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), 56 (4), and is detected by calculating the difference from the previous measurement value. In addition, the inclination amount of the second structure 14 (2) can be calculated by detecting two different displacement amounts Δy2.

  Similarly, the displacement amount Δy1 of the first structure 14 (1) with respect to the third structure 16 with respect to the third structure 16 can be measured using the distance y1 between the third rising plate 52b and the first reference surface 20 (1). Measurement is performed by inserting N depth bars Nd into the third through holes 56 (1), 56 (2), and detection is performed by calculating the difference from the previous measurement value. In addition, the inclination amount of the first structure 14 (2) can be calculated by detecting two different displacement amounts Δy1.

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

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

  As shown in FIG. 7B, the displacement measuring jig 58 is formed of an angle member 52 having a cross section perpendicular to the length direction formed in an L shape, and has two surfaces 52a and 52b perpendicular to each other. Have. One surface 52a is a portion to be the third substrate 52a of the displacement measuring jig 58, and at both end portions in the length direction, mounting holes 54a and 54b for attaching to the third reference surface 20 (3) are paired. It is provided. Further, the other surface 52b is a portion to be the third standing plate 52b of the third jig 22 (3), and a predetermined interval is provided in the length direction, and the two third through holes 56 (1), 56 (2) is provided.

  The third substrate 52a is disposed 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 such that the length direction is parallel to the X direction. (3) is abutted and fixed to the mounting holes 54a and 54b through the fixing tool 36. The third standing plate 52b stands upright in the direction perpendicular to the third substrate 52a (the Z direction), and faces the fourth reference surface 20 (4) at a predetermined distance.

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

  The usage method of the displacement measurement jig 58 is the same as that of the third jig 22 (3) described above. The displacement measuring jig 58 is, for example, a jig suitable for the case where it is assumed that the fourth structure 14 (4) is displaced only in the Y direction, and is a part 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 description of the configuration and use of the first and second jigs 22 (1) and 22 (2) described above, each jig is a side surface of the first and second structures 14 (1) and 14 (2). Although the case attached to is assumed, it may be attached and used for the ceiling surface or the floor surface of the 1st and 2nd structures 14 (1) and 14 (2). In addition, it is also possible to attach and use it on the surface inclined to the ground.

  Furthermore, when the condition of the surface of the structure to be measured is good, the first vertically standing plate and the first horizontally rising plate are provided on the surface of the object to be measured without providing the first substrate, the second substrate and the third substrate. , The second vertical standing plate, the second horizontal standing plate, and the third standing plate may be directly attached. In the case of providing the first to third substrates, it is preferable to use an angled member, but members other than the angled member may be used. Further, 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.

  The displacement amount measuring jig 10 can also be used when monitoring the progress of a crack generated on the side surface or the like of one box culvert 14 as shown in FIG. 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) The same measurement as described above can be performed by attaching one jig 22 (1) and attaching the second jig 22 (2) to the second structure 62 (2).

  Furthermore, the first to fourth structures for which displacement measuring jigs are used may be structures other than the box culvert constituting the passage and the concrete foundation, and the concrete such as tunnel lining is cast in place. There may be used any structure, and the type is not particularly limited. For example, it can be used for displacement measurement of various infrastructure structures, such as monitoring of the relative displacement between the concrete leg of the bridge and the steel floor slab, and monitoring of the cracked portion generated in the concrete wall in the tunnel.

10, 50, 58 Jig for displacement measurement 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 plane 20 (2) second reference plane 20 (3) third reference plane 20 (4) fourth reference plane 22 (1) first jig 22 (2) second jig 22 (22) 3) Third jigs 26, 28, 42, 44, 52 Angle member 26b First lateral standing plate 28b First vertical standing plate 34 First through hole 38 First substrate 42b Second horizontal standing plate 44b Second vertical standing plate 48 Second substrate 52a Third substrate 52b Third standing plate 56 (1), 56 (2), 56 (3), 56 (4) Third through hole N calipers Nd depth bar

Claims (6)

A jig for measuring displacement of structures adjacent to each other,
A substrate is provided on the reference surface of one structure, and a part of the substrate provided on the one structure faces the reference surface of the other structure and faces the reference surface of the other structure A through-hole is provided in the substrate to measure the distance between the substrate and the reference surface of the other structure. A jig for measuring displacement of structures adjacent to each other,
A rising plate is provided in a direction intersecting the reference plane of one structure, and a part of the rising plate provided on the one structure faces the reference plane of the other structure, and the other A through hole for measuring the distance between the standing plate and the reference surface of the other structure is provided in the standing plate facing the reference surface of the structure of Equipment.   The jig for displacement measurement according to claim 1 or 2, wherein a plurality of the through holes are provided at positions separated from each other.   The displacement measuring jig according to claim 3, wherein the rising plate is provided by an angle member having an L-shaped cross section. A displacement measurement method for measuring the displacement of structures adjacent to each other, comprising:
A substrate is provided on a reference surface of one of the structures, and a part of the substrate provided on the one structure faces the reference surface of the other structure, and faces the reference surface of the other structure. The substrate is provided with a plurality of through holes for measuring the distance between the standing plate and the reference surface of the other structure, and the distance between the substrate and the reference surface of the other structure with respect to the plurality of through holes. And measuring the inclination of the other structure with respect to the one structure based on the distance of the substrate to the reference surface of the other structure at the plurality of through holes. Displacement measurement method. A displacement measurement method for measuring the displacement of structures adjacent to each other, comprising:
A standing plate is provided in a direction intersecting the reference plane of one structure, and a part of the standing plate provided on the one structure faces the reference plane of the other structure, and the other structure is provided. A plurality of through holes for measuring the distance between the rising plate and the reference surface of the other structure are provided in the rising plate facing the reference surface of the object, and for the plurality of through holes, the rising plate and the above The distance to the reference plane of the other structure is measured, and based on the distance of the upstanding plate to the reference plane of the other structure at the plurality of through holes, the other structure relative to the one structure A displacement measurement method characterized by calculating an inclination of an object.

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