JP2013221922A - Measuring device and measuring method for end part of reinforcing bar - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a measuring device for an end part of a reinforcing bar, which can accurately measure a dimension of an enlarged diameter part of a reinforcing bar with an error as small as possible, and in a short time.SOLUTION: The measuring device for an end part of a reinforcing bar includes: a pedestal 3 on which a reinforcing bar 10 is placed, lying with an axis being positioned; a positioning member with which an end surface of an enlarged diameter part 11 of the reinforcing bar 10 placed on the pedestal 3 is in contact, to position the end surface; a light source 5 for irradiating the enlarged diameter part 11 and a part near the enlarged diameter part 11 with light; imaging means 6 for obtaining a silhouette image formed by light having passed through the enlarged diameter part 11 and the part near the enlarged diameter part 11, and light having been shielded by the reinforcing bar 10 of the enlarged diameter part 11 and the part near the enlarged diameter part 11; and an inspection part for measuring a dimension of the enlarged diameter part 11 on the basis of an imaging signal from the imaging means 6.

Description

  The present invention relates to a reinforcing bar end measuring device and a reinforcing bar end measuring method for measuring a dimension of a diameter expansion portion of a reinforcing bar.

  A fixing portion for fixing to another reinforcing bar or concrete is provided at the end of a reinforcing rod embedded in a reinforced concrete structure or precast concrete. The fixing part was formed by bending the end of the reinforcing bar into a U-shape or L-shape. However, in order to improve the fixing function and reduce the cost of forming the fixing part, A diameter-enlarged portion with an enlarged end portion is used as a fixing portion (see, for example, Patent Document 1).

JP 2000-257209 A

  The inspection to confirm that the end of the diameter-enlarged reinforcing bar has the desired shape is carried out by manually measuring the diameter, thickness, and eccentricity of the enlarged diameter part using a caliper and depth gauge. Therefore, a great deal of labor was required. The measurement uses a caliper, a depth gauge, and a scale and a plurality of measuring devices as necessary, and the inspection work load and the inspection work time are increasing year by year as the number of processes increases. Measurements performed using measuring instruments such as calipers and depth gauges are all made by the operator's visual observation, so the measurement error may increase due to individual differences depending on the operator's skill level, for example, depending on the case. Could lead to incorrect test results.

  The problem to be solved by the present invention is to accurately measure the size of the expanded portion of the reinforcing bar.

  In order to solve the above-mentioned problem, the reinforcing bar end measuring device according to the present invention is a device for measuring the size of the enlarged diameter portion formed at the end of the reinforcing bar, and in a state where the reinforcing bar lies down and the shaft is positioned. A cradle to be placed; and a positioning member that moves between a positioning position for contacting the end surface of the enlarged diameter portion of the reinforcing bar placed on the cradle and a retracted position away from the positioning position; A light source for irradiating light to the enlarged diameter portion and the vicinity of the enlarged diameter portion respectively positioned by the cradle and the positioning member, light passing through the enlarged diameter portion and the enlarged diameter portion, and the enlarged diameter portion and the enlarged diameter portion. An imaging unit that captures a silhouette image formed by light shielded by a reinforcing bar in the vicinity of the diameter portion, and an inspection unit that measures the size of the enlarged diameter portion based on an imaging signal from the imaging unit. Features.

  As a result, light is irradiated from the light source to the enlarged diameter portion and the enlarged diameter portion of the reinforcing bar whose shaft and end face are positioned by the cradle and the positioning member, and the light and the enlarged diameter portion that have passed through the enlarged diameter portion and the enlarged diameter portion. And the silhouette image formed with the light shielded by the reinforcing bar in the vicinity of the enlarged diameter portion is imaged by the imaging means. Based on the imaging signal from the imaging means, the dimension of the enlarged diameter portion is measured by the inspection portion. Moreover, since the axis | shaft and end surface of the enlarged diameter part of the reinforcing bar from which a dimension is measured are positioned by a cradle and a positioning member, the measurement error at the time of measuring an enlarged diameter part becomes as small as possible. Therefore, the dimension of the diameter expansion part of a reinforcing bar can be measured accurately.

  In this case, the reinforcing bar is a deformed reinforcing bar having a large number of semicircular ridges and protruding portions of the axial ridge, and the cradle is composed of one cradle or two or more cradles. The receiving surface on which the reinforcing bar of the receiving table closest to the enlarged diameter portion to be measured is placed is a pair of receiving surfaces having a reverse cross-sectional shape, and the pair of receiving surfaces. The length of the reinforcing bar in the axial direction of the receiving surface is formed with a dimension that allows at least four semicircular ridges to be placed on one diameter of the cradle or two or more cradles for the diameter-expanded portion to be measured. A presser member that presses the reinforcing bar placed on the nearest cradle against the cradle and fixes the reinforcing bar can be movably provided.

  In this case, the cradle is composed of one cradle or two or more cradles, and one cradle and two or more cradles are mounted with the cradle closest to the enlarged diameter portion to be measured. It can be formed such that the center of gravity of the reinforcing bar having the shortest length is positioned on the cradle. Further, the cradle is composed of two or more cradles, and the cradle other than the cradle disposed closest to the diameter-expanded portion of the two or more cradles is connected to the shaft of the reinforcing bar. It can be formed so as to be individually movable in each direction. Furthermore, a length measuring unit that measures the length of the reinforcing bar positioned by the positioning member in contact with the end surface opposite to the end surface on the diameter-enlarged portion side where the measurement is performed can be provided.

  Moreover, in order to solve the said subject, the reinforcing bar edge part measuring method which concerns on this invention is a method of measuring the dimension of the enlarged diameter part formed in the edge part of a reinforcing bar, Comprising: Reinforcing bar placed on a cradle and a reinforcing bar The positioning member is positioned after the end surface of the enlarged diameter portion of the reinforcing bar is brought into contact with the positioning member to position the end surface of the enlarged diameter portion, and the reinforcing bar is pressed against and fixed to the cradle by the holding member. Is moved to a position away from the end face of the enlarged diameter part, and after the movement, the light is applied to the enlarged diameter part and the vicinity of the enlarged diameter part, and the light passing through the enlarged diameter part and the enlarged diameter part, the enlarged diameter part, and A silhouette image formed by light shielded by a reinforcing bar in the vicinity of the enlarged diameter portion is captured, and the dimension of the expanded diameter portion is measured based on an imaging signal obtained by the imaging.

  By comprising in this way, the dimension of a diameter expansion part is measured similarly to the reinforcing bar edge measuring device concerning the present invention. Moreover, since the axis | shaft and end surface of the enlarged diameter part of the reinforcing bar from which a dimension is measured are positioned by a cradle and a positioning member, the measurement error at the time of measuring an enlarged diameter part becomes as small as possible. Therefore, the dimension of the diameter expansion part of a reinforcing bar can be measured accurately.

  According to the present invention, it is possible to accurately measure the dimension of the enlarged diameter portion of the reinforcing bar.

It is a perspective view which shows the reinforcing bar edge part measuring apparatus of one example embodiment concerning this invention. It is a top view which shows the reinforcing bar edge measuring device of an example of this embodiment. It is a side view which shows the principal part of the reinforcing bar edge part measuring apparatus of an example of this embodiment. It is a front view which shows the cradle and fixing | fixed part in the reinforcing bar edge measuring device of an example of this embodiment. It is a perspective view which shows the principal part of the reinforcing bar edge part measuring apparatus of an example of this embodiment. It is a perspective view which shows the cradle in the reinforcing bar edge measuring apparatus of an example of this embodiment. It is a partial cross section figure showing the cradle in the reinforcing bar edge measuring device of an example of this embodiment.

  Hereinafter, an embodiment of a reinforcing bar end measuring apparatus according to the present invention will be described with reference to the accompanying drawings. As shown in FIG. 1 to FIG. 3 and FIG. 5, the reinforcing bar end measuring device (hereinafter simply referred to as “measuring device 1”) of an example of the present embodiment measures the dimension of the enlarged diameter portion 11 of the reinforcing bar 10. Is. The rebar 10 is not particularly limited as long as it is used for reinforced concrete, and examples thereof include a deformed rebar having a semicircular ridge (node 10a) and a protruding portion of an axial ridge (rib). In addition, although a different diameter reinforcing bar is used as the reinforcing bar 10 in this embodiment, it is not limited to this. Further, the reinforcing bar 10 for measuring the enlarged diameter portion 11 is a different diameter reinforcing bar, but this different diameter reinforcing bar includes all the different diameter reinforcing bars, that is, different lengths. And those with different diameters. An enlarged diameter portion 11 is formed at one or both ends of the reinforcing bar 10. The diameter of the enlarged diameter part 11 is not particularly limited as long as the diameter is larger than that of the reinforcing bar 10. For example, an enlarged diameter part by hot upsetting described in Patent Document 1 can be given.

  The measuring apparatus 1 irradiates light to the cradle 3 on which the reinforcing bar 10 is placed, the positioning member 4 that positions the end surface 12 of the enlarged diameter portion 11 of the reinforcing bar 10, and the enlarged diameter portion 11 and the vicinity of the enlarged diameter portion 11. Imaging means 6 that captures a silhouette image formed by a light source 5 that performs light passing through the enlarged diameter portion 11 and the vicinity of the enlarged diameter portion 11 and light shielded by the reinforcing rod 10 near the enlarged diameter portion 11 and the enlarged diameter portion 11. And an inspection unit that measures the dimension of the enlarged diameter portion 11 based on the imaging signal from the imaging means 6. The cradle 3, the positioning member 4, the light source 5, and the imaging means 6 are provided on the gantry 2.

  It is preferable that the gantry 2 is formed firmly so that the rebar 10 does not shake when measuring the dimensions of the rebar 10. The gantry 2 is formed of, for example, a frame body in which a frame material having a substantially rectangular cross section made of metal such as aluminum or steel is assembled in a rectangular parallelepiped shape. The side frame 2a located on the side surface of the gantry 2 is connected to the opposite ends of the two mutually facing first horizontal frame members 21 spaced apart in the vertical direction and the substantially central portion by the vertical frame members 22 respectively. It is formed in the horizontally long substantially rectangular shape. With the two side frames 2a facing each other at an interval in the horizontal direction, the three corner portions excluding the corner portion above the rear portion are connected by the second horizontal frame member 23, respectively. The upper side of the mutually opposing surfaces of the vertical frame member 22 and the central vertical frame member on the back side of the two side frames 2a are connected by a third horizontal frame member 24, respectively. Further, the substantially central portion of the front vertical frame member 22 and the central vertical frame member 22 of the first horizontal frame member 21 above the two side frames 2 a is connected by the fourth horizontal frame member 25. Yes.

  Further, a fifth horizontal frame member 26 extending in the front-rear direction is mounted in a substantially central portion of the two third horizontal members. The fifth horizontal frame member 26 is formed, for example, at a height that is horizontally long in cross section and whose upper surface is substantially flush with the plane including the upper surface of the fourth horizontal frame member 25. The fifth horizontal frame member 26 is attached in a state where the front end is in contact with the substantially central portion of the side surface on the rear end side of the fourth horizontal frame member 25, and the rear end is more than the third horizontal frame member 24 on the rear side. It is formed with a length extending rearward. In addition, guide grooves 26 a are respectively formed in the vicinity of both sides of the upper surface of the fifth horizontal frame member 26 over the entire longitudinal direction thereof. The upper ends of both walls that form the guide groove 26a are formed as guide pieces 26b that protrude toward the opposing walls. Further, between the second horizontal frame member 23 on the front side of the two first horizontal frame members 21 positioned below and the third horizontal member at the substantially central portion, for example, two sixth horizontal frame members 27 are spaced. It is connected with a gap. On the sixth horizontal frame member 27, for example, an inspection unit or other machines or instruments can be placed. In FIGS. 1 to 4, reference numeral 2b denotes a reinforcing member. Moreover, in FIG. 1, the code | symbol 19 shows the caster which enables the mount frame 2, ie, the measuring apparatus 1, to move. Furthermore, a stopper for preventing the movement of the gantry 2, that is, the measuring device 1, is provided on the lower surface of the gantry 2.

  Moreover, between the 5th horizontal frame material 26 and the 2nd horizontal frame material 23 of the front upper upper side, as shown in FIGS. 1-3 and FIG. 5, for example, the rectangular flat plate-shaped irradiation board 52 is spanned. It is attached in the state. The light source 5 is provided on the irradiation plate 52. The light source 5 is, for example, a backlight 51 that irradiates parallel light upward, for example, upward in the vertical direction. The light irradiation range by the backlight 51 is a range that can irradiate the enlarged diameter portion 11 and the vicinity of the enlarged diameter portion 11. For example, the center in the width direction is substantially the center in the width direction (left-right direction) of the gantry 2. The center in the front-rear direction is a rectangular range located approximately at the center between the fifth horizontal frame member 26 and the upper second horizontal frame member 23. An imaging means 6 is provided above the irradiation plate 52, for example, above the vertical direction and further above the diameter-enlarged portion 11 of the reinforcing bar 10 placed on the cradle 3.

  The imaging means 6 captures a silhouette image formed by light that has passed through the enlarged diameter portion 11 and the vicinity of the enlarged diameter portion 11 and light that has been shielded by the reinforcing rod 10 of the enlarged diameter portion 11 and the enlarged diameter portion 11. Although not limited, for example, a two-dimensional CCD camera 61 is used. The CCD camera 61 is not particularly limited. For example, the center is substantially the center in the width direction (left-right direction) of the gantry 2 and between the fifth horizontal frame member 26 and the second horizontal frame member 23 on the front side. It is arrange | positioned so that it may become a position of the front side from the approximate center. The CCD camera 61 is attached to the rear surface of the support column 28 erected at the substantially central portion of the second horizontal frame member 23 on the upper front side via the attachment member 65. The attachment member 65 is formed so that the position of the CCD camera 61 can be moved in the front-rear direction. The attachment member 65 is attached to the support column 28 so that the attachment position in the vertical direction can be adjusted, and the position in the front-rear direction and the vertical direction of the CCD camera 61 can be adjusted. The CCD camera 61 is connected to the inspection unit.

  The inspection unit measures the dimensions, for example, the diameter, thickness, and eccentricity of the enlarged diameter portion 11 based on the imaging signal from the CCD camera 61. Further, the inspection unit may have a determination function of comparing the measured value and the reference value to determine whether or not the enlarged diameter portion 11 is acceptable. For the reference value, for example, it is preferable to form the enlarged diameter portion 11 as a reference, measure the diameter, thickness, and eccentricity of the enlarged diameter portion 11 in advance, and use these measured values as the reference value. Further, since the diameter of the enlarged diameter portion 11 varies depending on the type of the reinforcing bar 10, a reference value is set in advance for each type of reinforcing bar 10.

  Further, as shown in FIGS. 1 to 5, a cradle 3 is provided on the upper surface of the gantry 2 to place the reinforcing bars 10 in a state of extending horizontally (for example, lying down). The cradle 3 is, for example, at least one cradle (first cradle) attached in a state of being placed on the substantially central portion of the upper surface of the fourth horizontal frame member 25 and the upper surface of the tip of the fifth horizontal frame member 26. It has a table 31). That is, the first cradle 31 is attached to a location closest to the diameter-expanded portion 11 to be measured. The first pedestal 31 is provided on the lower surface of the receiving portion 31a, and the receiving portion 31a is formed in an elongated shape having a substantially concave cross section with an upper opening, and protrudes in a flange shape from below both side surfaces of the receiving portion 31a. It consists of the attachment part 31b. Note that the receiving portion 31a and the attachment portion 31b may be formed as separate members or may be formed integrally. When the receiving part 31a and the attaching part 31b are formed by separate members, for example, the receiving part 31a and the attaching part 31b are connected by a bolt 17 (see FIG. 7) or the like.

  The receiving part 31a is formed in a substantially rectangular parallelepiped shape. A receiving surface 31c on which the reinforcing bars 10 are placed is provided on the upper surface of the receiving portion 31a. The receiving surfaces 31c are preferably a pair of receiving surfaces having a cross-sectionally inverted C shape. That is, the receiving surface 31c is inclined inwardly so as to hold the rebar 10 with the shaft positioned. The positioning of the reinforcing bar 10 by the receiving surface 31 c, that is, the cradle 3 is preferably set so that the axis of the reinforcing bar 10 is orthogonal to the shooting direction by the CCD camera 61. The shape of the upper surface of the receiving portion 31a is not particularly limited as long as the receiving surface 31c is formed in an inverted cross-sectional shape, and a V-shaped recess is formed in the center of the upper surface of the receiving portion 31a. The character-shaped surface may be the receiving surface 31c, or the upper end surfaces of both side portions having a concave cross section may be inclined inward to form the receiving surface. Moreover, it is preferable that the width | variety of the receiving surface 31c is formed in the width | variety which can respond | correspond to all the diameters of the reinforcing bar 10 which measures the enlarged diameter part 11. FIG.

  Although the length of the receiving part 31a (receiving surface 31c) in the front-rear direction (the axial direction of the mounted reinforcing bar 10) is not particularly limited, it is formed with dimensions that allow four or more nodes 10a of different diameter reinforcing bars to be mounted. It is preferable. The different diameter reinforcing bars here are preferably reinforcing bars having the narrowest spacing between the nodes 10a. If the length of the receiving portion 31a is formed so that three or less nodes 10a can be placed, the reinforcing bars 10 are shaken when the reinforcing bars 10 are placed, and the reinforcing bars 10 cannot be stably placed. In particular, this is because the reinforcing bar 10 may be shaken when the reinforcing bar 10 is fixed with the presser member 8. The length of the receiving portion 31a (receiving surface 31c) in the front-rear direction (the axial direction of the mounted reinforcing bar 10) is the shortest reinforcing bar, for example, the shortest reinforcing bar 10 (for example, the reinforcing bar having a length of about 400 mm). ) Is preferably dimensioned so that it can be positioned using only the first cradle 31, for example, it is preferably dimensioned so that the nodes 10 a of different diameter reinforcing bars can be placed 10 to 20. The receiving portion 31a is formed so that the center of gravity of the reinforcing bar 10 is positioned on the receiving portion 31a when the shortest reinforcing bar 10 (for example, a reinforcing bar having a length of about 400 mm) is placed. Preferably it is. This is because when the center of gravity of the reinforcing bar 10 is in front of the receiving part 31a, the reinforcing bar 10 cannot be stably placed when the reinforcing bar 10 is placed on the receiving part 31a (first receiving base 31).

  The width of the attachment portion 31b is formed to be the same as or slightly smaller than the width of the fifth horizontal frame member 26. The width of the receiving portion 31a is formed so that both flanges, which are portions protruding from the receiving portion 31a of the mounting portion 31b, cover both guide grooves of the fifth horizontal frame member 26. Moreover, although the attaching part 31b may be provided in the whole front-back direction of the lower surface of the receiving part 31a, for example, it is formed in the lower surface of the receiving part 31a from the location away from the front end back to the rear end. It is preferable. That is, it is preferable that the front end of the receiving portion 31a is positioned as far forward as possible, so that when the short rebar 10 is placed on the receiving portion 31a, the diameter-expanded portion 11 side is stably moved without moving downward. The rebar 10 can be placed. When the front end is viewed from the upper surface, the attachment portion 31b is substantially the same position as the edge of the front end side of the upper surface of the fourth horizontal frame member 25 and the center in the width direction is the same position as the center of the fifth horizontal frame member 26. Are attached to the fourth horizontal frame member 25 and the fifth horizontal frame member 26. That is, the attachment portion 31 b is attached to all or substantially all of the upper surface of the fourth horizontal frame member 25 in the front-rear direction. A presser member 8 is provided above the first cradle 31.

  The presser member 8 presses and fixes the reinforcing bar 10 placed on the first cradle 31 to the first cradle 31 and is attached to the support body 81 via the rod 82 so as to be movable in the vertical direction. . The support body 81 is attached via an L-shaped attachment member 85 above the support column 29 attached in a state of being erected on the fourth horizontal frame member 25. The L-shaped attachment member 85 is attached to the support column 29 so that the attachment position in the vertical direction can be adjusted. Thereby, the vertical position of the pressing member 8 can be adjusted. The adjustment of the position of the presser member 8 is not particularly limited as long as the reinforcing bar 10 placed on the first cradle 31 can be fixed. For example, when the rebar 10 is moved downward, it is placed on the first cradle 31. The reinforcing bar 10 is pressed against the first pedestal 31 to fix the reinforcing bar 10, the reinforcing bar 10 is placed upward from the first pedestal 31, and the rebar 10 is placed upward. It is preferable to adjust so that it can move between release positions where it can be easily detached from the cradle 31.

  The shape of the presser member 8 is not particularly limited as long as the reinforcing bar 10 placed on the first cradle 31 can be pressed against and fixed to the first cradle 31. For example, the presser member 8 is formed in a flat rectangular parallelepiped shape that is long in the front-rear direction. Has been. The length of the pressing member 8 in the front-rear direction is formed to be substantially the same as the length of the upper surface of the fourth horizontal frame member 25 in the front-rear direction, for example. It is preferable that the pressing member 8 is disposed so as to press the reinforcing bar 10 placed on the first cradle 31 above the upper surface of the fourth horizontal frame member 25 against the first cradle 31.

  Moreover, as shown in FIGS. 1, 2, 6, and 7, the cradle 3 preferably has an auxiliary cradle 32 that is another cradle in addition to the first cradle 31. The number of auxiliary cradle 32 is not particularly limited, but one or two or more may be used. For example, the longest reinforcing bar 10 among the reinforcing bars 10 to be measured can be stably placed on the cradle 3. One, two or three are preferably three in the illustrated example. The auxiliary cradle 32 has the same basic configuration as the first cradle 31 and includes a receiving part 32a, a mounting part 32b, and a receiving surface 32c. The auxiliary cradle 32 has a length shorter than that of the first cradle 31 in the front-rear direction. ing. A through hole 31d is provided in both flanges of the auxiliary cradle 32 corresponding to the guide groove of the fifth horizontal frame member 26. The auxiliary cradle 32 is placed on the fifth horizontal frame member 26 so that the center in the width direction is the same position as the center of the fifth horizontal frame member 26 when viewed from above, and each bolt 15 is mounted on both flanges. The nut 16 is engaged with the guide piece 26b by tightening the bolt 15 by being screwed into the nuts 16 inserted in advance into the two guide grooves 26a of the fifth horizontal frame member 26 through the through hole 31d. It can be attached to the fifth horizontal frame member 26. Further, by weakening the bolts 15, the auxiliary cradle 32 can move along the guide grooves 26 a, that is, along the longitudinal direction of the fifth horizontal frame member 26. Therefore, the auxiliary cradle 32 is attached to the fifth horizontal frame member 26 so as to be movable to a desired position.

  The positioning member 4 has a positioning position (position indicated by a broken line in FIG. 3) for positioning by bringing the end face 12 of the enlarged diameter portion 11 of the reinforcing bar 10 placed on the cradle 3 into contact, and a retracted position (from the positioning position). The position of the end surface 12 of the enlarged diameter portion 11 of the reinforcing bar 10 is determined by moving between the positions of the solid lines in FIG. The positioning position of the end surface 12 is preferably set so that the enlarged diameter portion 11 is positioned at substantially the center of the light irradiation range of the backlight 51 when viewed from above. Further, the position of the CCD camera 61 is formed by the light that has passed through the enlarged diameter portion 11 and the vicinity of the enlarged diameter portion 11 by the CCD camera 61 and the light shielded by the reinforcing bar 10 near the enlarged diameter portion 11 and the enlarged diameter portion 11. For example, when viewed from above, the end surface 12 of the enlarged diameter portion 11 positioned by the positioning member 4 is positioned slightly forward from the center of the CCD camera 61 in the front-rear direction. It may be set as described. The positioning member 4 is formed in, for example, a rectangular flat plate shape, and one surface is formed as a contact surface with which the end surface 12 contacts. The other surface of the positioning member 4 is attached to the support body 41 via a rod 42 so as to be movable in the front-rear direction. The support body 41 is attached to the rear surface of the front column 28 via an attachment member 45. The attachment member 45 is attached to the support column 28 so that the attachment position in the vertical direction can be adjusted. Thereby, the position of the positioning member 4 in the vertical direction can be adjusted. Further, as shown in FIG. 5, the positioning member 4 is provided with a screw member protruding from this surface (projecting rearward in the front-rear direction) on the surface which is the contact surface, and a nut 4a screwed into the screw member. The rear surface may be configured as a contact surface. Thereby, the position of the contact surface can be finely adjusted by rotating the nut 4a with respect to the screw member.

  Further, a length measuring unit 9 is provided on the fifth horizontal frame member 26 of the gantry 2. The length measuring unit 9 measures the length of the reinforcing bar 10 positioned by the positioning member 4 in contact with the end surface on the opposite side to the end surface 12 on the diameter-enlarged portion 11 side where the measurement is performed. As the length measuring unit 9, for example, an encoder or the like is used, and an extension for measuring the rebar 10 that is movable in the longitudinal direction on the upper surface of the fifth horizontal frame member 26 and placed on the cradle 3. The movable piece 91 comes into contact with the end face on the opposite side of the end face 12 on the diameter part 11 side, and the measuring part 92 measures the length of the reinforcing bar 10 from the position of the movable piece.

  In order to measure the size of the enlarged diameter portion 11 of the reinforcing bar 10 using such a measuring apparatus 1, first, the enlarged diameter portion 11 to be measured is positioned below the CCD camera 61 to receive the reinforcing bar 10. 3 is placed on the side. At this time, the positioning member 4 is positioned at the positioning position, and the end surface 12 of the enlarged diameter portion 11 is brought into contact with the positioning member 4. After the reinforcing bar 10 is placed on the receiving base 3 and the end surface 12 is brought into contact, the presser member 8 is lowered to press the reinforcing bar 10 against the first receiving base 31 to fix the reinforcing bar 10. After fixing, the positioning member 4 is moved from the positioning position to the retracted position.

  Next, light is emitted from the backlight 51 upward, that is, toward the enlarged diameter portion 11 and the vicinity of the enlarged diameter portion 11 to illuminate the enlarged diameter portion 11 and the enlarged diameter portion 11 from below, and the backlight 51 and the enlarged diameter portion 11 are illuminated. A silhouette image formed by light passing through the enlarged diameter portion 11 and the vicinity of the enlarged diameter portion 11 and light shielded by the reinforcing bar 10 near the enlarged diameter portion 11 and the enlarged diameter portion 11 by the CCD camera 61 positioned above Image. At this time, since the rebar 10 is fixed by the presser member 8 and the first cradle 31, a silhouette image can be taken by the CCD camera 61 without the rebar 10 being shaken. An imaging signal of the captured silhouette image is sent from the CCD camera 61 to the inspection unit. The inspection unit measures dimensions such as the diameter, thickness, and eccentricity of the enlarged diameter portion 11 based on the imaging signal from the CCD camera 61. If the inspection unit has a determination function, the measurement value and the reference value are obtained. In comparison, the pass / fail of the enlarged diameter portion 11 is determined. Since the shaft and the end surface 12 of the enlarged diameter portion 11 of the reinforcing bar 10 which has measured the enlarged diameter portion 11 are positioned by the cradle 3 and the positioning member 4, a measurement error when measuring the enlarged diameter portion 11 is possible. As small as possible.

  Therefore, the reinforcing bar end measuring apparatus 1 of the present embodiment can accurately measure the dimension of the enlarged diameter portion 11 of the reinforcing bar 10. As a result, it is possible to eliminate human errors that may occur depending on the measurement environment and the measurer, and it is also possible to automatically measure the dimension of the enlarged diameter portion 11 of the reinforcing bar 10. Further, in the manual measurement using a conventional caliper and a depth gauge, the time required for one inspection takes about 120 seconds, but in this measuring apparatus 1, the inspection time is about 15 seconds, which is much longer than the conventional time. Reduction is possible. Furthermore, when the inspection unit has a determination function, the diameter-enlarged portion 11 of the reinforcing bar 10 can be accurately determined. In addition, measured values and judgment data are managed as digital data by the inspection unit, and these data are printed out on paper media, portable media (USB memory, storage on external hard disk, memory such as SD card, etc.) For example, it is possible to shorten the inspection table preparation time and the like by saving data to a card or the like, or transferring data by LAN or the like.

  The first cradle 31 is formed on the first cradle 31 by being formed with such a length that four or more nodes 10a that are semicircular ridges can be placed when the reinforcing bar 10 is placed. The rebar 10 is not shaken, particularly when the rebar 10 placed on the first cradle 31 is fixed with the presser member 8, the rebar 10 is not shaken. Can be measured. Further, as shown in FIG. 5, the first cradle is arranged such that the center of gravity of the rebar 10 having the shortest length (for example, a rebar having a length of about 400 mm) is positioned on the first cradle 31. Since 31 is formed, especially when the reinforcing bar 10 having the shortest length is placed on the first cradle 31, the enlarged diameter portion 11 side does not move downward due to the weight, so that it is surely not displaced. Since positioning of the enlarged diameter part 11 and the reinforcing bar 10 can be performed, the dimension of the enlarged diameter part 11 of the reinforcing bar 10 can be accurately and reliably measured. FIG. 5 is a diagram for explaining a state in which the rebar 10 having a particularly short length is placed only on the first cradle 31, and a reinforcing member and the like are omitted for easy understanding.

  The cradle 3 includes two or more cradles 31 and 32, and the auxiliary cradle 32 other than the first cradle 31 is formed so as to be individually movable. Since the position of the auxiliary cradle 32 can be adjusted, the rebar 10 can be stably placed on the cradle 3. That is, when the reinforcing bar 10 having a long length is placed on the first cradle 31, the weight of the reinforcing bar 10 extending rearward from the first cradle 31 becomes heavier. This is because the steel bar cannot be stably held by being inclined downward. Further, the length of the receiving portion 31a (receiving surface 31c) in the front-rear direction (the axial direction of the mounted reinforcing bar 10) is set to the first length of the reinforcing bar 10 having the shortest length (for example, a reinforcing bar having a length of about 400 mm). For example, the rebar 10 having the shortest length (for example, a long length) can be positioned by using only the cradle 31, for example, the dimension in which the nodes 10 a of different diameter rebars can be placed 10 to 20. The rebar having a length of about 400 mm can be reliably positioned only by the first cradle 31. Furthermore, when the receiving surface 31c on which the reinforcing bar 10 of the cradle 3 is placed is a pair of receiving surfaces having a cross-sectionally inverted C shape, when the reinforcing bar 10 having a different diameter is viewed from above, the axis of the reinforcing bar 10 is coaxial. Can be positioned. Therefore, the reinforcing bar end measuring apparatus 1 of the present embodiment can accurately measure the dimension of the enlarged diameter portion 11 even with the reinforcing bars 10 having different lengths or the reinforcing bars 10 having different diameters.

  Moreover, by providing the length measurement part 9, the length of the reinforcing bar 10 can be measured together with the measurement of the dimension of the enlarged diameter part 11, and the measured value is also compared with the reference value to determine whether the length of the reinforcing bar 10 is acceptable or not. If the determination is made, the size and length of the enlarged diameter portion 11 of the reinforcing bar 10 can be accurately measured.

  Since the CCD camera 61 is attached to the support column 28 via the mounting member 65 so that the position in the front-rear direction and the vertical direction can be adjusted, the position of the CCD camera 61 can be adjusted with respect to the enlarged diameter portion 11. The dimension of the enlarged diameter part 11 can be measured correctly. Further, since the position of the CCD camera 61 can be adjusted according to the size of the enlarged diameter portion 11 and the type of the reinforcing bar 10, the dimension of the enlarged diameter portion 11 can be accurately measured. Furthermore, since the location where the rebar 10 is pressed and fixed to the first cradle 31 by the presser member 8 is on the fourth horizontal frame member 25, the rebar 10 can be fixed without the first cradle 31 being shaken. The dimension of the enlarged diameter part 11 can be measured.

DESCRIPTION OF SYMBOLS 1 Measuring apparatus 2 Base 3 Receiving base 4 Positioning member 5 Light source 6 Imaging means 8 Pressing member 9 Length adjusting part 10 Reinforcing bar 11 Expanded part 12 End surface 31 First receiving stand 32 Auxiliary receiving stand 51 Backlight 61 CCD camera

Claims (6)

An apparatus for measuring the dimension of the enlarged diameter portion formed at the end of the reinforcing bar,
A cradle to be placed in a state where the rebar lies and the shaft is positioned;
A positioning member that moves between a positioning position for contacting and positioning an end face of the enlarged diameter portion of the reinforcing bar placed on the cradle and a retracted position away from the positioning position;
A light source for irradiating light near the enlarged diameter portion and the enlarged diameter portion respectively positioned by the cradle and the positioning member;
Imaging means for capturing a silhouette image formed by light that has passed through the enlarged diameter portion and the vicinity of the enlarged diameter portion and light shielded by a reinforcing bar in the vicinity of the enlarged diameter portion and the enlarged diameter portion;
A reinforcing bar end measuring apparatus, comprising: an inspection unit that measures a dimension of the enlarged diameter portion based on an imaging signal from the imaging means. The rebar is a deformed rebar having a plurality of semicircular ridges and protruding portions of axial ridges,
The cradle comprises one cradle or two or more cradles,
Of the one cradle and the two or more cradles, the receiving surface on which the reinforcing bar of the cradle closest to the diameter-expanded portion where the measurement is performed is a pair of receiving surfaces having an inverted cross-section. And the length of the pair of receiving surfaces in the axial direction of the reinforcing bars is formed with a dimension capable of mounting at least four of the semicircular ridges,
A pressing member for fixing the reinforcing bar can be moved by pressing a reinforcing bar placed on the receiving base closest to the enlarged diameter portion to be measured among the one receiving base or two or more receiving bases. The reinforcing bar end measuring apparatus according to claim 1, wherein the reinforcing bar end measuring apparatus is provided. The cradle comprises one cradle or two or more cradles,
Of the one cradle and the two or more cradles, the cradle closest to the diameter-expanded portion where the measurement is performed is such that the center of gravity of the reinforcing bar having the shortest length is positioned on the cradle. The reinforcing bar end measuring apparatus according to claim 1 or 2, wherein the measuring apparatus is configured to be formed as described above.   The cradle is composed of two or more cradles, and a cradle other than the cradle disposed at a location closest to the enlarged diameter portion for performing the measurement among the two or more cradles is the reinforcing bar. The reinforcing bar end measuring device according to any one of claims 1 to 3, wherein the measuring device is formed so as to be individually movable in the axial direction.   The length measurement part provided with the length measurement part which contacts the end surface on the opposite side to the end surface by the side of the enlarged diameter part which performs the said measurement, and measures the length of the said reinforcing bar positioned by the said positioning member. The reinforcing bar end measuring apparatus according to item 1. A method for measuring the dimension of the enlarged diameter portion formed at the end of the rebar,
The reinforcing bar is placed on a pedestal to position the axis of the reinforcing bar, and the end surface of the enlarged diameter portion of the reinforcing bar is brought into contact with the positioning member to position the end surface of the enlarged diameter portion. After pressing and fixing to the cradle, the positioning member is moved to a position away from the end face of the enlarged diameter portion. After the movement, light is irradiated to the enlarged diameter portion and the enlarged diameter portion, and the enlarged diameter portion and the enlarged diameter portion are irradiated. A silhouette image formed by the light that has passed through the vicinity of the diameter portion and the light that has been shielded by the enlarged diameter portion and the reinforcing bar in the vicinity of the enlarged diameter portion is captured, and the dimensions of the expanded diameter portion are measured based on the imaging signal obtained by the imaging. A method for measuring the end of a reinforcing bar.

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