JP2014066591A - Measuring device and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure the outer shape of a reinforcing bar buried in a reinforced concrete structure being used without cutting out the reinforcing bar from the structure.SOLUTION: Concrete of a reinforced concrete structure 2 is removed to expose a reinforcing bar 4 in a measurement space 6. A measuring device 10 includes an optical sensor 12 for obliquely radiating measurement light to the reinforcing bar 4 from the outside of the measurement space 6. A mirror part 16 to be disposed behind the reinforcing bar 4 is fixed to the sensor 12 with a mirror support part 18. The range of radiation of the measurement light is larger than the outer diameter of the reinforcing bar 4, and the measurement light is directly radiated to a facing portion of the reinforcing bar 4 for measurement (a first section). The measurement light outside the first section is reflected on the mirror part 16 and indirectly reaches side surface and back surface portions (a second section and a third section). After the completion of the measurement, the measuring device 10 is removed, and the measurement space 6 is backfilled.

Description

  The present invention relates to a measuring device for measuring a circumferential shape of a reinforcing bar having a reinforced concrete structure.

  In recent years, there has been a problem that “cover concrete” is peeled off with the aging of reinforced concrete structures. Since the peeling of cover concrete can cause damage to third parties around the structure, the manager of the structure is expected to take appropriate measures to prevent it. Conventionally, various structural devices have been proposed to prevent the covering concrete from peeling off (see, for example, Patent Document 1 and Patent Document 2).

Japanese Patent Laid-Open No. 9-303095 JP 2011-12471 A

  In order to prevent the covering concrete from peeling off, it is important to clarify the mechanism apart from the structural device. As one of the approaches, research by nonlinear FEM analysis is known, but in order to make the analysis more practical, the amount of corrosion products generated at the outer periphery of the reinforcing bar, which is the cause of cover concrete peeling (rebar corrosion amount) It is indispensable to actually measure the shape.

  Until now, corroded rebars were taken out from reinforced concrete specimens prepared in the laboratory and measured, but they are used for reinforced concrete structures in service to further improve accuracy. It is desirable to measure the reinforcing bars. However, from the viewpoint of strength, it is not possible to cut and measure a reinforcing bar from a reinforced concrete structure in service.

  This invention is made | formed in view of such a subject, and it aims at measuring the external shape, without cutting out the reinforcement embed | buried in the reinforced concrete structure in service.

  A first invention for solving the above problems is a measuring device that measures the circumferential shape of a reinforcing bar in which the concrete part of the reinforced concrete structure is removed and the entire circumference including the back surface is exposed using an optical sensor. The sensor support portion that supports the sensor in a posture to irradiate the measurement light toward the oblique side of the reinforcing bar, and the reflection surface is arranged or formed in a V shape or a concave shape with the reflection surface facing inward. A mirror unit, and a mirror support unit that supports the mirror unit in a predetermined relative positional relationship facing the sensor, and the mirror unit is disposed on the back side of the reinforcing bar when viewed from the sensor. Then, by irradiating the measurement light, the second section on one side and the third section on the other side of the entire circumference of the reinforcing bar are centered on the first section to which the measurement light is directly irradiated. In the mirror part That the measuring light of the reflected light is irradiated, it is the entire circumference of the peripheral shape is measurable measurement apparatus of the first to the reinforcing bar by synthesizing measurement results of the third section.

  According to the first invention, it is possible to expose the reinforcing bar embedded in the reinforced concrete structure and measure the outer shape thereof. Reinforcing bars are not cut out, and can be restored to their original state by backfilling the removed concrete part.

  A second aspect of the invention is a linear guide portion that supports the sensor support portion so as to be movable in a linear direction, and leg portions that are in contact with the reinforced concrete structure and are provided on both sides of the linear direction. A leg portion having a leg length capable of maintaining the sensor supported by the sensor support portion at a position away from the outer surface of the reinforced concrete structure during movement by the guide portion, wherein the linear direction is parallel to the longitudinal direction of the rebar. It is a measuring device of the 1st invention by which rotation of the device main part to the peripheral direction to the above-mentioned reinforcing bar is restricted by the above-mentioned leg part.

  According to the second invention, the same effect as the first invention can be obtained, and when measuring a long rebar, even if the sensor is moved in the longitudinal direction of the rebar and measured in multiple times, Since the relative positional relationship of the sensor with respect to the reinforcing bar can be kept substantially constant, it becomes easy to synthesize a circumferential shape of the entire long reinforcing bar by matching a plurality of measurement results.

  3rd invention is a measuring device of the 1st or 2nd invention further equipped with the holding part which hold | grips the said reinforcing bar and maintains the relative distance of the apparatus main body with respect to the said reinforcing bar.

  According to the third invention, the same effects as those of the first or second invention can be obtained, and the relative distance between the reinforcing bar and the sensor can be fixed. Can be improved.

  A fourth invention is the measuring apparatus according to any one of the first to third inventions, further comprising a measurement guide temporarily fixed in the longitudinal direction of the reinforcing bar in order to show the boundary between the first to third sections. is there.

  According to a fifth aspect of the invention, the computer reads the data from the storage unit that stores the measurement result data of the first to third sections measured by the measurement device of the fourth aspect, and the measurement guide is measured. This is a program for functioning as a combining means for connecting and combining based on the position.

  According to the fourth and fifth inventions, the same effect as any of the first to third inventions can be obtained, and the measurement results for each section can be easily synthesized by using the measurement guide as a reference.

  According to a sixth aspect of the present invention, the storage unit stores data of measurement results at a plurality of positions measured at different positions in the longitudinal direction of the reinforcing bar, and the combining unit is configured to measure the results at the plurality of positions. The program according to the fifth aspect of the present invention has means for correcting the measurement result based on the relative positional relationship between the positions measured by the measurement guide.

  According to the sixth invention, the same effect as that of the fifth invention can be obtained, and the measurement results at a plurality of positions measured at different positions in the longitudinal direction of the reinforcing bar can be appropriately corrected.

The front view which shows the structural example of a measuring device. The top view which shows the structural example of a measuring device. AA sectional drawing which shows the structural example of a measuring device. BB sectional drawing which shows the structural example of a measuring device. The figure which shows the structural example around a sensor. The flowchart for demonstrating a measurement procedure. The figure for explaining measurement procedure step S2 and step S4. The figure for explaining measurement procedure step S8. The figure for demonstrating the synthetic | combination method of outline data. The figure for demonstrating the modification concerning calculation of external shape data. The figure which shows the modification of a mirror part.

[First Embodiment]
FIG. 1 is a front view showing a configuration example of a measuring apparatus to which the present invention is applied. FIG. 2 is a top view of the same. 3 and 4 are longitudinal sectional views taken along the lines AA and BB in FIG. 1, respectively. In FIG. 3, some of the components are not shown, but the omitted illustration is shown in FIG.

  The measuring device 10 is a measurement space 6 formed by removing concrete around the reinforcing bars 4 embedded in the reinforced concrete structure 2 (generally called a “hanging space”, a concave space formed in a reinforced concrete structure in service. )) Is a device for measuring the outer peripheral shape over the entire circumference of the exposed reinforcing bar 4.

The measuring device 10
(1) a main frame 20 for fixing the apparatus to the reinforced concrete structure 2;
(2) a linear guide portion 30 suspended from the main frame 20;
(3) A gripping unit 50 that grips the reinforcing bar 4 to be measured and maintains the relative posture and relative distance of the apparatus main body with respect to the reinforcing bar 4;
(4) an optical sensor 12 for measuring the outer peripheral shape of the reinforcing bar 4;
(5) a sensor support unit 14 that supports and fixes the sensor 12 to the linear guide unit 30 in a posture in which measurement light is irradiated obliquely toward the reinforcing bar 4;
(6) a V-shaped mirror section 16 with the reflecting surface facing inward;
(7) a mirror support portion 18 that supports the mirror portion 16 in a predetermined relative positional relationship facing the sensor 12;
(8) a measurement guide 7 temporarily fixed to the reinforcing bar 4 at the time of measurement;
Is provided.

  The main frame 20 is a base for fixing the apparatus to the reinforced concrete structure 2. As shown in FIGS. 1 and 2, in this embodiment, a rail base 22 and a foot base 23 are detachably connected to both ends of the main shaft 21 with connecting bolts 24. Is made. Although the main frame 20 can also be referred to as the apparatus main body, in the present embodiment, the main frame 20 and its accessories excluding the leg 25, the gripping part 50, the sensor 12, and the sensor support part 14 are referred to as the apparatus main body. And

  The rail base 22 hangs directly below the main shaft 21, is used to suspend the linear rail 32 of the linear guide portion 30, and to fix the grip portion 50.

  The foot base 23 has a length enough to straddle the measurement space 6, and leg portions 25 are attached to both ends. The leg portion 25 is a so-called “adjuster foot” whose length can be adjusted, and has a leg length capable of maintaining the sensor 12 at a position away from the outer surface of the reinforced concrete structure 2. In the present embodiment, a total of four pieces are prepared so as to straddle the reinforcing bars 4 to be measured, but the number of legs can be appropriately changed.

  A hex nut portion 25a is provided at the upper end portion of the leg portion 25 so that the protruding length of the lower portion from the foot base 23 can be easily adjusted with a tool. Moreover, the grounding part 25b which contact | abuts to the reinforced concrete structure 2 of the lower end of the leg part 25 is comprised so that a swing is possible so that grounding can be carried out also on some sloping surfaces. The four corners of the measuring device 10 are brought into contact with the outer surface of the reinforced concrete structure 2 corresponding to the outer periphery of the measuring space 6 by the leg portions 25, thereby preventing displacement of the device under measurement and the device main body in the circumferential direction of the reinforcing bar 4. Can be limited.

  As shown in FIGS. 2 and 4, the main shaft 21, the rail base 22, and the foot base 23 have a fitting portion 27 as appropriate so that the main shaft 21, the rail base 22 and the foot base 23 can be engaged with each other only in a predetermined relative posture. The mounting angle of the main shaft 21 is variable with the longitudinal direction of the main shaft 21 as the rotation axis. Accordingly, a plurality of bolt holes 28 of the connecting bolt 24 penetrating and connecting these three members are provided around the rotating shaft.

  Linear rails 32 of the linear guide portion 30 are clamped and fixed to the two rail bases 22 protruding directly below the main shaft 21.

  As shown in FIGS. 1 and 3, the linear guide portion 30 is a so-called “linear motion mechanism” including a slider 34 that linearly moves slidably with respect to the linear rail 32. A plurality of recesses 33 are formed on the side surface of the linear rail 32. Correspondingly, the slider 34 is provided with a fixing bezel screw 35 into which the tip can be inserted and removed from the recess 33. When the tip of the fixed bezel screw 35 is screwed so as to be inserted into any of the recesses 33, the linear rail 32 and the slider 34 can be fixed.

  In addition, a grip portion 50 that grips the reinforcing bar 4 is fixed to each of the two rail bases 22. Specifically, as shown in FIGS. 1 and 4, a toggle clamp 54 is suspended from a lower end portion of the rail base 22 via a clamp stay 52. The toggle clamp 54 is selected to have a size capable of gripping and fixing the reinforcing bar 4. The linear guide 30 is held at a predetermined position parallel to the reinforcing bar 4 by sandwiching and fixing the reinforcing bars 4 with the respective toggle clamps 54. Further, coupled with the fixing of the main frame 20, the rotation around the reinforcing bar 4 is also restricted.

  As shown in FIG. 3, the sensor 12 is fixed to the slider 34 of the linear guide portion 30 via the sensor support portion 14. That is, the linear guide part 30 supports the sensor support part 14 so that a movement to the linear direction to guide is possible.

  The sensor 12 is an optical sensor that can irradiate measurement light (scanning light) toward the measurement target and receive the reflected light to measure the distance to the measurement target. It is also called a laser displacement sensor. For example, it scans and irradiates an infrared laser within a predetermined irradiation angle range using measurement light, and indicates the distance of each measurement point on the scanning line by triangulation using the received reflected light. Distance data can be output. In the present embodiment, a so-called two-dimensional scan type laser displacement sensor is used, and scanning in the cross-sectional direction of the reinforcing bar 4 is possible.

  The sensor 12 is fixed to the linear guide portion 30 by the sensor support portion 14. In the present embodiment, the sensor 12 is located at a position outside the measurement space 6 that is laterally shifted from the position directly above the reinforcing bar 4 (on a straight line that passes through the center of the reinforcing bar 4 and perpendicularly intersects the surface of the reinforced concrete structure 2). The irradiation center axis of the measurement light of the sensor 12 (a chain line extending from the sensor 12 of FIG. 3 through the reinforcing bar 4) is detachably held in a posture that forms 30 degrees with respect to the surface of the reinforced concrete structure 2. In addition, the angle which the irradiation optical axis of the measurement light of the sensor 12 makes with the surface of the reinforced concrete structure 2 is not limited to 30 degrees, and can be appropriately set if it is oblique. 30 degrees to 60 degrees is suitable, for example, about 45 degrees may be used.

  As shown in FIGS. 3 and 5, a mirror support portion 18 that supports the mirror portion 16 is fixed to the sensor 12. The mirror portion 16 has a mirror in which the reflecting surface is arranged or formed in a V shape or a concave shape with the reflecting surface facing inward, and is viewed from the sensor 12 by the mirror support portion 18 on the back side of the reinforcing bar 4 to be measured. It is arranged to be located.

The mirror unit 16 has a size sufficient to cover the irradiation angle range of the measurement light. Therefore, the measurement light emitted from the sensor 12 is directly emitted to the front surface of the opposing reinforcing bar 4, and the measurement light that has been removed from the outer side of the reinforcing bar 4 is reflected by the mirror unit 16 and the side surface and the back surface of the reinforcing bar 4. Is indirectly irradiated.
The mirror support portion 18 is formed by appropriately bending and bending a rod that is thinner than the width of the mirror portion 16 (the width in the longitudinal direction of the reinforcing bar 4).
The mirror unit 16 is not limited to a so-called mirror and may be realized by other optical elements. For example, it may be realized by interface reflection of an optical element such as solid glass. Anyway, it can be said to be a functional mirror.

  In the present embodiment, a range measured by direct irradiation of measurement light is referred to as a “first section”, and the first section is centered on the side surface and the back surface to which the measurement light is indirectly irradiated. One side is called a “second section” and the other side is called a “third section”. And when measuring, the measurement guide 7 is temporarily fixed to the boundary position of those divisions beforehand.

  The measurement guide 7 is a ruler-like thin plate having a constant plate thickness and cross-section over the entire length, and is created by incorporating a permanent magnet or a permanent magnet and attached to the rebar 4 with a magnetic force, or an adhesive or the like It is temporarily fixed to the reinforcing bar 4 with an adhesive or the like. In the present embodiment, the third measurement guide 7 is temporarily fixed just behind the sensor 12 as viewed from the sensor 12, and the first and second measurement guides 7 are temporarily fixed so as to be spaced 120 degrees from the center of the reinforcing bar 4. To do.

  Next, the procedure for measuring the outer shape of the reinforcing bar 4 will be described with reference to FIGS. 1 to 5 and FIGS.

FIG. 6 is a flowchart for explaining a procedure for measuring the outer shape of the reinforcing bar 4 of the reinforced concrete structure 2 using the measuring apparatus 10 of the present embodiment.
First, “hanging” is performed to remove the concrete portion of the reinforced concrete structure 2 (step S2). As shown in FIG. 7, the concrete is removed to the back side of the reinforcing bar 4. Specifically, the concrete is removed to such an extent that the mirror unit 16 does not hit the bottom of the measurement space 6 when the measuring device 10 is installed thereafter.

  Since the measurement space 6 is formed around the reinforcing bar 4 to be measured and the reinforcing bar 4 is exposed by “hanger”, next, the corrosion product formed on the exposed reinforcing bar 4 is removed (step S4). . In the example of FIG. 7, the original outer peripheral shape of the reinforcing bar 4 was substantially circular as shown by the broken line in the figure. By removing the corrosion product (in short, rust), the remaining portion of the hatched reinforcing bar 4 remains. By measuring this outer shape and comparing it with the original outer peripheral shape, the amount of corrosion and the corrosion location can be confirmed.

Next, the measuring device 10 is installed (step S6).
Specifically, the measuring device 10 is temporarily installed so that the linear rail 32 is along the longitudinal direction of the exposed reinforcing bar 4, the reinforcing bar 4 is held by the holding unit 50, and the relative position of the measuring device 10 and the reinforcing bar 4 is fixed. To do. The gripping by the gripping part 50 is performed at two locations near both ends of the linear rail 32, and as a result, the linear rail 32 is arranged substantially in parallel immediately above the reinforcing bar 4. Note that the length of the leg portion 25 is adjusted as appropriate to stabilize the main frame 20.
Next, the position of the slider 34 is set to a desired position, and the sensor support unit 14 is attached to the slider 34, so that the sensor 12 integrally provided with the mirror unit 16 is attached to the slider 34 by the mirror support unit 18. The state at this stage when the installation is completed is as shown in FIGS. The relative distance of the measuring device 10 with respect to the reinforcing bar 4 is maintained by the gripping part 50, and the rotation of the reinforcing bar 4 in the circumferential direction is restricted by the leg part 25.

Next, as shown in FIG. 8, the measurement guide 32 is attached to the reinforcing bar 4 (step S8). When viewed in a cross section in the diametrical direction, as shown by the blow-out portions in FIGS. 3 and 5, the temporary fastening is performed in 120 degree increments so as to indicate the boundary between the first section to the third section on the outer periphery of the reinforcing bar 4.
In addition, you may reverse the procedure of installation of the measuring device 10 of step S6, and attachment of the measurement guide 32 of step S8.

Next, measurement is performed (step S10).
As shown in FIG. 3, in measurement, the sensor 12 is connected to an analysis computer 90, and measurement data from the sensor 12 is output to the computer 90. In a recording medium 92 such as an IC memory or a magnetic disk mounted on the computer 90, a measurement program 93 and correction data 94 (details will be described later) are stored in advance. The central processing unit of the computer 90 reads and executes the measurement program 93 before the measurement, and starts processing related to the measurement. When the measurement is started, the computer 90 records the measurement data from the sensor 12 as measurement raw data 95.

  When the reinforcing bar 4 is actually measured, each measurement data of the first section to the third section has two straight portions that are the measurement portions of the measurement guide 7 respectively. Except for the part between the two.

  Returning to the flowchart of FIG. 6, when the necessary measurement is completed, the computer 90 corrects the measurement raw data 95 based on the correction data 94, synthesizes the outer shape data 96 of the reinforcing bar 4, and appropriately calculates the result. The information is displayed on the flat panel display 97 (step S12).

FIG. 9 is a diagram for explaining an example of a method for synthesizing the outline data 96.
The measurement coordinate system of the sensor 12 is an orthogonal triaxial coordinate, the diameter cross section of the reinforcing bar 4 is an X-axis / Z-axis plane, the axial direction of the reinforcing bar is the Y axis, and the distance from the sensor 12, that is, the measured value is the Z axis. .

  The correction data 94 is created based on the measurement result using the perfect circular cross-section body 5 that looks like a new and non-corroding rebar 4. The correction data 94 is data for converting the measurement result of the sensor 12 into a radius value of the reinforcing bar 4. Specifically, when the measurement result of the perfect circular cross-section 5 is viewed in the XZ coordinates, for example, the measurement result as shown in FIG. 9 (1) is obtained. The measurement result M2 of the second section irradiated with the measurement light reflected by the mirror section 16 with the measurement result M1 (black thick line in the figure) of the first section irradiated with the measurement light directly from the sensor 12 as the center, and The measurement results M3 of the third section are arranged side by side along the X axis. The distance L2 reflected by the mirror unit 16 is added to each measurement value of the measurement result M2 of the second section and the measurement result M3 of the third section. As a result, the measurement result of the perfect circular cross-section 5 is such that three semicircular arcs are arranged in three steps. However, since the perfect circular section 5 has a uniform radius in the first place, the value of the measurement coordinate system Z-axis must be constant regardless of the X coordinate value (the position of the measurement point according to the resolution of the sensor 12). . Therefore, as shown in FIG. 9 (2), the measurement coordinate system X-axis is set so that the measurement result of the perfect circular cross-section 5 by the sensor 12 has a predetermined radius (assumed radius of the corrosion-free reinforcing bar 4). A correction value for the corresponding Z-axis value (measurement value) can be determined. The correction data 94 is set as table data or a function that determines the correlation between the X coordinate value and the correction value.

Therefore, by subtracting the correction value associated with the measurement point in the correction data 94 from the measurement value (Z-axis value) at each measurement point stored in the measurement data 95, the outer shape of the rebar 4 after corrosion That is, the radius value can be obtained. Then, the peripheral shape of the reinforcing bar 4 can be synthesized by displaying the value of the radius at each measurement point in polar coordinates.
The computer 90 stores the synthesis result in the information recording medium 92 as outline data 96 and executes a process of displaying the synthesis result on the flat panel display 97 as a graph or a graphic.

  Next, the measurement guide 7 and the measurement device 10 are removed (step S18). And after apply | coating a primer to the inner surface of the measurement space 6, it repairs with the repair agent excellent in adhesiveness, such as a non-shrink mortar and a resin mortar, and backfills the measurement space 6 (step S20), and a series of procedures regarding measurement. Exit.

As mentioned above, according to this embodiment, the outer periphery of the circumference can be measured, without cutting out the reinforcing bar currently embed | buried in the reinforced concrete structure in service.
Moreover, since the measurement light can be irradiated to the back of the reinforcing bar 4 that cannot be seen from the sensor 12 by the mirror unit 16, the entire outer circumference of the reinforcing bar 4 can be measured by one measurement. There is no need to change the position of the sensor 12, and man-hours related to measurement can be reduced.
Further, the sensor 12 is supported at a predetermined position outside the measurement space 6 away from the measurement space 6. If the sensor 12 must be placed in the measurement space 6 for measurement, the sensor 12 may not be placed in an appropriate position for measurement at a location where the bar spacing of the reinforced concrete structure 2 is close. However, in this embodiment, since the sensor 12 is supported outside the measurement space 6, there is no worry about that. Further, since the mirror portion 16 is supported by the thin mirror support portion 18, the mirror portion 16 can be slid between the bar arrangements even at a place where the bar arrangement interval is close and disposed behind the target reinforcing bar 4. it can.

[Modification]
As described above, the embodiment to which the present invention is applied has been described. However, the embodiment of the present invention is not limited to this, and additions, omissions, and changes of components can be appropriately made.

[Part 1]
For example, when synthesizing the outer shape data 96 of the reinforcing bar 4 based on the measurement data, a synthesis method using the measurement guide 7 can be added to or replaced with the correction based on the correction data 94.
Specifically, as shown in FIG. 10, the measurement data D1 of the first section, the measurement data D2 of the second section, and the measurement data D3 of the third section each include a straight line portion that is a measurement portion of the measurement guide 7. Since there are two locations, the portion other than the portion sandwiched between the two straight portions is excluded.

  Here, considering that the reinforcing bar 4 is originally circular, the contact positions P3 ′ and P4 ′ between the measurement guide 7 and the reinforcing bar 4 in the measurement data D2 of the second section should originally be at the positions P3 and P4. Conceivable. Similarly, it is considered that the contact positions P5 'and P6' between the measurement guide 7 and the reinforcing bar 4 in the measurement data D3 of the third section should originally be at the positions P5 and P6. Therefore, the affine transformation is performed so that the contact positions P1 to P6 are arranged on the same circle or the error from the same circle to the arrangement position is minimized. For example, the measurement data D2 of the second section and the measurement data D3 of the third section are subjected to axial symmetry conversion with the reflection surface (V-shaped broken line) of the mirror section 16 as the symmetry axis. Then, enlargement / reduction, rotation, and parallel movement are performed as appropriate. That is, the computer 90 can be made to function as a combining unit that connects and combines the measurement guides 7 based on the measured positions.

[Part 2]
In addition, the position of the sensor 12 is changed along the axial direction of the reinforcing bar 4 by sliding the slider 34, and the circumferential shape of the reinforcing bar 4 is obtained at each position. It is also possible to add alignment correction for the measurement results obtained multiple times.
Specifically, since the thickness and cross-sectional shape (rectangular cross section) of the measurement guide 7 are constant over the entire length, the contact positions P1, P2 in the first section are arranged on a straight line even in a plurality of measurement results. The Therefore, the affine transformation is performed so that the contact position P1 for each measurement time and the contact position P2 for each measurement time are arranged in a straight line. That is, it is possible to configure the computer 90 to function as means for correcting the measurement result based on the relative positional relationship between the positions where the measurement guide 7 is measured in the measurement results at a plurality of positions. The same treatment can be performed for the contact positions P3 and P4 of the second section and the contact positions P5 and P6 of the third section.

[Part 3]
Moreover, in the said embodiment, although the mirror part 16 was set as the structure which has a some bending | flexion reflective surface, such as V shape and L shape, if the measurement light from the sensor 12 can be reflected in the side surface and back surface of the reinforcing bar 4, it is. The shape and the number of reflecting surfaces are not limited. For example, if the measurement light from the sensor 12 is irradiated as substantially parallel light, a configuration with a mirror part 16B having a single parabolic curved surface is possible as shown in FIG. If the irradiation point of the measurement light from the sensor 12 is regarded as one point, the mirror unit 16 may be configured to form a part of an elliptical curved surface having the irradiation point and the center of the reinforcing bar 4 as an elliptical center. .

DESCRIPTION OF SYMBOLS 2 ... Reinforced concrete structure 4 ... Reinforcement 6 ... Measurement space 7 ... Measurement guide 10 ... Measuring device 12 ... Sensor 14 ... Sensor support part 16 ... Mirror part 18 ... Mirror support part 20 ... Main frame 21 ... Main shaft 22 ... Rail base 23 ... Foot base 24 ... Connection bolt 25 ... Leg 30 ... Linear guide 32 ... Linear rail 34 ... Slider 35 ... Fixing bezel screw 50 ... Holding part 52 ... Clamp stay 54 ... Toggle clamp 90 ... Computer 92 ... Recording medium (storage part)
93 ... Measurement program 94 ... Correction data

Claims (6)

A measuring device that measures the circumferential shape of the reinforcing bar with the entire circumference including the back side exposed by removing the concrete part of the reinforced concrete structure using an optical sensor,
A sensor support unit that supports the sensor in a posture to irradiate measurement light toward an oblique side of the reinforcing bar;
A mirror part in which the reflecting surface is arranged or formed in a V shape or a concave shape with the reflecting surface facing inward;
A mirror support part for supporting the mirror part in a predetermined relative positional relationship facing the sensor;
And the measurement light is directly irradiated out of the entire circumference of the reinforcing bar by arranging the mirror portion so as to be positioned on the back side of the reinforcing bar when viewed from the sensor and irradiating the measuring light. With the first section being the center, the second section on one side and the third section on the other side are irradiated with the reflected light of the measurement light by the mirror unit, and the measurement results relating to the first to third sections are combined. By doing so, a measuring device capable of measuring the circumferential shape of the entire circumference of the reinforcing bar. A linear guide portion that supports the sensor support portion so as to be movable in a linear direction;
Legs that are in contact with the reinforced concrete structure and are provided on both sides of the linear direction, the sensor being supported by the sensor support part when moved by the linear guide part, at a position away from the outer surface of the reinforced concrete structure A leg having a leg length that can be maintained in
The measurement according to claim 1, further comprising: limiting the rotation of the apparatus main body in the circumferential direction with respect to the reinforcing bar by the legs by arranging the linear direction parallel to the longitudinal direction of the reinforcing bar. apparatus.   The measuring device according to claim 1, further comprising a grip portion that grips the reinforcing bar and maintains a relative distance of the apparatus main body with respect to the reinforcing bar. A measurement guide temporarily fixed in the longitudinal direction of the reinforcing bar to indicate the boundary between the first to third sections;
The measuring device according to any one of claims 1 to 3, further comprising: Computer
The data is read from a storage unit that stores data of measurement results of the first to third sections measured by the measurement device according to claim 4, and the measurement guide is connected and synthesized based on the measured position. A program for functioning as a synthesis means. The storage unit stores data of measurement results at a plurality of positions measured at different positions in the longitudinal direction of the reinforcing bar,
The synthesizing unit includes a unit that corrects the measurement result based on the relative positional relationship of the position at which the measurement guide is measured in the measurement result at the plurality of positions.
The program according to claim 5.

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