JP6587812B2 - Deformed bar rib detection device - Google Patents

Description

  The present invention relates to a deformed reinforcing bar rib detecting device for detecting a rib or a flat portion extending in the axial direction of a deformed reinforcing bar having a node shape such as a bamboo reinforcing bar or a threaded reinforcing bar.

  As one of the reinforcing bars, there is known a deformed reinforcing bar having a node shape such as a bamboo reinforcing bar having a rib or a node provided on the surface and a screw reinforcing bar having a flat part or a screw part provided on the surface. Currently, deformed reinforcing bars are used for reinforced concrete structures and precast concrete. For example, when the deformed reinforcing bar is used for a reinforced concrete structure, a fixing portion for fixing to the reinforcing bar or concrete is provided at an end portion. 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.

  When a fixing part is provided on a deformed reinforcing bar, for example, a bamboo knot reinforcing bar, the end is heated by upsetting by pressing the reinforcing bar heated at a temperature at which the end can be plastically deformed and pressing it with the mold body while guiding it with the reinforcing bar position control device. The portion is plastically deformed to form a fixing portion (for example, see Patent Document 1). The reinforcing bar position regulating device prevents the reinforcing bar from being distorted or bent when the reinforcing bar is pressed with a mold, and the rib is configured to guide the reinforcing bar positioned up and down. For this reason, the deformed reinforcing bar is positioned so that the rib of the deformed reinforcing bar is detected and the rib is positioned vertically.

  A magnetic sensor as a proximity switch is used to detect a deformed reinforcing bar rib. The magnetic sensor consists of two brackets in which the lower part of the deformed reinforcing bar placed on a pair of reinforcing bar receiving rollers is in contact with or close to the lower part of the deformed reinforcing bar. Arranged in close proximity. The three magnetic sensors are arranged in the axial direction of the reinforcing bar at intervals smaller than the interval between the nodes of the deformed reinforcing bar. Thereby, when the reinforcing bar rotates and the circumferential position (lower part) of the reinforcing bar facing the magnetic sensor is a node, all the magnetic sensors are not simultaneously turned on, and the two ribs of the deformed reinforcing bar Since the rib extends in the entire axial direction of the reinforcing bar when all the magnetic sensors are turned up and down, all the magnetic sensors are turned on simultaneously. Thus, since the position of the rib of the deformed reinforcing bar can be detected by the three magnetic sensors, the deformed reinforcing bar can be positioned so that the rib is positioned up and down.

JP 2005-288460 A

  However, in the detection of the rib of the deformed reinforcing bar described above, the magnetic sensor as three proximity switches is arranged in a state where the lower part of the deformed reinforcing bar is close to the bracket that the lower part of the deformed reinforcing bar is in contact with or close to the deformed reinforcing bar. The bracket is worn by the contact, and the deformed rebar directly contacts the magnetic sensor and often breaks the magnetic sensor.

  The problem to be solved by the present invention is to provide a deformed reinforcing bar rib detection device excellent in maintainability.

  In order to solve the above-mentioned problem, the rib detecting device for deformed reinforcing bars according to the present invention is a detecting device for detecting ribs protruding along the axial direction of the surface of the deformed reinforcing bar, and rotates the deformed reinforcing bar around the axis. A rebar rotation mechanism, a contact displacement member that contacts the surface of the deformed rebar rotated by the rebar rotation mechanism and is displaced by the unevenness of the surface, and a sensor that detects the rib by the displacement of the contact displacement member. It is characterized by that.

  With this configuration, when the deformed reinforcing bar is rotated by the reinforcing bar rotation mechanism, the contact displacement member that is in contact with the surface of the reinforcing bar is displaced by the unevenness of the surface, and the sensor detects the rib by this displacement. It is only the contact displacement member that is worn by contact. For this reason, since the sensor is not damaged, only the contact displacement member needs to be replaced. Therefore, the detection apparatus of the rib of a deformed reinforcing bar excellent in maintainability is obtained.

  In this case, the deformed reinforcing bar is a bamboo reinforcing bar having a plurality of nodes protruding in the circumferential direction of the surface and an axial rib, and the contact displacement member extends in a direction perpendicular to the axis of the reinforcing bar and is on the surface of the reinforcing bar. When a plurality of contact displacing members are arranged parallel to each other and have a swingable contact portion that is urged to contact and contacts the surface, and at least one of the plurality of contact displacement members contacts a portion other than the rib, The sensor has a light source for irradiating light provided across the contact displacement member and a light receiving unit for receiving the light source. When the contact displacement member is in contact with the surface between the nodes of the reinforcing bar, the contact displacement member blocks the optical path between the light source and the light receiving unit, and when the contact displacement member contacts the rib, it is displaced so as not to block the optical path. Can be configured. Further, the reinforcing bar rotating mechanism has a pair of reinforcing bar receiving rollers that rotate the deformed reinforcing bars placed in a state where they are laid sideways, and the contact displacement member is connected to the reinforcing bar mounted on the reinforcing bar receiving roller. It can be provided in contact with the lower part of the surface. The contact displacement member can be formed of an L-shaped member that is rotatably supported at a location where a short side portion that is a contact portion and a long side portion that is a detection target of the sensor intersect.

  Further, in this case, the attachment is for detecting a flat portion of a threaded reinforcing bar having a screw portion protruding in the circumferential direction of the surface and a flat portion corresponding to the rib, and is attached to the contact displacement member. There can be provided an attachment for the threaded reinforcing bar whose side is in contact with the surface of the reinforcing bar, and a moving mechanism for moving the contact displacement member and the sensor in the vertical and horizontal directions perpendicular to the axis of the reinforcing bar. In addition, when a plurality of contact displacement members are provided, the attachment includes an attachment portion that is attached to all contact portions of the plurality of contact displacement members, and a contact piece that is fixed from the attachment portion and contacts the side of the reinforcing bar. Can have.

  Further, in this case, the deformed rebar is a screw node rebar having a thread portion protruding in the circumferential direction of the surface and a flat portion corresponding to the rib, and the rebar rotating mechanism is placed in a state of being laid sideways. Further, two pairs of reinforcing bar receiving rollers that rotate the deformed reinforcing bars are provided, and the contact displacement member can be provided so as to be in contact with the side of the surface of the deformed reinforcing bar placed on the reinforcing bar receiving roller. Moreover, the movement mechanism which moves a contact displacement member and a sensor to the up-down and left-right direction orthogonal to the axis | shaft of a reinforcing bar can be provided.

  ADVANTAGE OF THE INVENTION According to this invention, the detection apparatus of the rib of the deformed reinforcing bar excellent in maintainability can be provided.

The perspective view of the detection device of the rib of the bamboo joint reinforcing bar of the same principle as the present invention. Perspective view of a state in which the attaching the attachment to the detection device of the flat portion of the screw section reinforcing bar according to the present invention. Perspective view of an example attachment of the detection device of FIG. The figure which shows the state which rotated the screw node reinforcement with the reinforcement receiving roller.

  Hereinafter, an embodiment of a deformed reinforcing bar rib detection device according to the present invention will be described with reference to the accompanying drawings. As shown in FIGS. 1 and 2, the deformed reinforcing bar rib detecting device according to the present invention (hereinafter simply referred to as “detecting device 1”) is a rib 11 a protruding along the axial direction of the surface of the deformed reinforcing bar 10. The flat part 12a corresponding to the rib 11a is detected. The deformed reinforcing bar 10 is used for, for example, reinforced concrete and the like, and is a bamboo knot reinforcing bar 11 having a protruding portion of a semicircular ridge (node 11b) and an axial ridge (rib 11a) or a substantially spiral protruding shape. (Screw part 12b) and the screw joint reinforcing bar 12 etc. which have the flat part 12a corresponding to the rib 11a extended in an axial direction are mentioned. In the present embodiment, the detection device 1 mainly detects the rib 11a of the bamboo rebar 11 and the case where the flat portion 12a of the screw joint 12 can be detected by attaching the attachment 5 will be described. It is not limited to. Further, the detection device 1 is suitable for detecting the rib 11a and the flat portion 12a for clamping the deformed reinforcing bar 10 with the clamp device when the fixing portion is provided in the deformed reinforcing bar 10, but is not limited thereto. is not.

  The detection device 1 is in contact with a reinforcing bar rotating mechanism 2 that rotates the deformed reinforcing bar 10 around an axis, a contact displacement member 3 that contacts the surface of the deformed reinforcing bar 10 rotated by the reinforcing bar rotating mechanism 2 and is displaced by surface irregularities. And a sensor 4 for detecting the rib 11a by the displacement of the displacement member 3. The reinforcing bar rotating mechanism 2 includes, for example, two pairs of reinforcing bar receiving rollers 21 and 21 that rotate the deformed reinforcing bar 10 placed in a horizontal state. The two sets of reinforcing bar receiving rollers 21 and 21 are installed such that the vicinity of both ends of the deformed reinforcing bar 10 is disposed. The reinforcing bar receiving rollers 21 and 21 are driven to rotate by driving rollers, and the deformed reinforcing bar 10 rotates around the axis by the rotation of the reinforcing bar receiving rollers 21 and 21. The contact displacement member 3 is disposed between the two sets of reinforcing bar receiving rollers 21 and 21.

  The contact displacement member 3 comes into contact with the surface of the rotating deformed reinforcing bar 10 and is displaced by the unevenness of the surface. The contact displacement member 3 includes a swingable contact portion 31 that extends in a direction perpendicular to the axis of the reinforcing bar 10 and is urged to contact the surface of the reinforcing bar and contacts the surface. A plurality of contact displacement members 3 are provided at intervals in the axial direction of the reinforcing bars. The distance between the contact displacement members 3 is such that at least one of the contact displacement members 3 is located between the nodes 11b and contacts the reinforcing bar surface when contacting a portion other than the rib 11a. In addition, since the interval between the contact displacement members 3 is different depending on the type (diameter), the manufacturer, or the like, the interval between the nodes 11b of the bamboo knot rebar 11 is different for all the bamboo knot reinforcing bars 11 for which the detection device 1 detects the rib 11a. When contacting a portion other than the rib 11a, it is preferable to arbitrarily set at least one so as to be located between the nodes 11b and contact the reinforcing bar surface of the portion. The number of the contact displacement members 3 may be two, three, four or more if at least one of the contact displacement members 3 is located between the nodes 11b and contacts the reinforcing bar surface of the portion when contacting with a portion other than the rib 11a. For example, three is preferable. In the present embodiment, the number of the contact displacement members 3 is described as three, but is not limited thereto.

  The contact displacement member 3 is not limited to a contact location on the surface of the reinforcing bar 10 placed on the reinforcing bar receiving rollers 21 and 21, but is preferably a lower part of the surface. The contact displacement member 3 includes, for example, a short side portion (contact portion 31) that extends in a substantially horizontal direction perpendicular to the axis of the reinforcing bar 10 and contacts the lower part of the surface of the reinforcing bar, and a substantially vertical direction from one end portion of the contact portion 31. It is formed with the reverse L-shaped member which consists of a long side part (detection part 32) extended below. Further, the contact displacement member 3 is supported so as to be rotatable about an axis 33 having a corner portion extending in parallel with the axis of the reinforcing bar 10. Furthermore, the contact displacement member 3 is urged so that a spring or the like is attached to, for example, the detection unit 32 and the contact unit 31 contacts the lower part of the reinforcing bar surface. Thereby, when the reinforcing bar 10 rotates, the contact displacement member 3 that is in contact with the surface of the reinforcing bar 10 is displaced by the unevenness of the surface.

  Note that the contact displacement member 3 has a short length from the shaft 33 that is rotatably supported to a portion that contacts the bamboo joint reinforcing bar 11, for example, the length of the contact portion 31, and from the shaft 33 to a portion that is detected by the sensor 4. It is preferable that the length of the detection part 32, for example, is long. Further, the shape of the contact displacement member 3 is not particularly limited as long as the contact portion 31 is short and the detection portion 32 is long. For example, the contact displacement member 3 is preferably formed in an L shape.

  The width of the contact portion 31 (the length in the axial direction of the reinforcing bar 10) is such that the portion where the reinforcing bar 10 contacts is longer than the portion on the shaft 33 side so that wear due to the contact of the reinforcing bar 10 is difficult. Is preferred. Further, a screw hole 34 for attaching the attachment 5 extending in the axial direction of the reinforcing bar 10 placed on the reinforcing bar receiving rollers 21, 21 is provided on the side surface of the contact part 31 on the front end part (the other end part) side. Yes. Three contact displacement members 3 are arranged at predetermined intervals in the axial direction of the reinforcing bar.

  The sensor 4 detects the rib 11a by the displacement of the contact displacement member 3, and may be configured in any manner as long as the rib 11a can be detected. For example, the light source that emits light and the light source light are received. The sensor main body 41 includes a light receiving unit, and the reflector 42 reflects light from the sensor main body 41 to the sensor main body 41. The sensor 4 is arranged so that the vicinity of the lower end of the detection part 32 of the contact displacement member 3 is a detection location, and when the contact displacement member 3 is in contact with the surface between the nodes 11b of the reinforcing bar 10, the contact is made. The displacement member 3 blocks the optical path between the light source and the light receiving portion, and when the contact displacement member 3 comes into contact with the rib 11a, the displacement member 3 is displaced and does not block the optical path. That is, in the sensor 4, when all three contact displacement members 3 are in contact with the ribs 11 a, the light receiving unit receives light from the light source (light source light), and at least one of the three contact displacement members 3 is a node. If it contacts the surface between 11b, it arrange | positions so that the light from a light source may not be light-received by a light-receiving part.

  The attachment 5 is for detecting the flat portion 12a of the screw rebar 12 and is attached to the contact displacement member 3 to make contact with the surface of the rebar lateral. The attachment 5 may be formed in any way as long as it is attached to the contact displacement member 3 and makes contact with the surface of the reinforcing bar laterally. For example, an attachment 51 attached to the contact displacement member 3 and an attachment portion And a contact piece 52 which is fixed to 51 and contacts the side of the reinforcing bar placed on the reinforcing bar receiving rollers 21 and 21.

  The attachment portion 51 is formed in a substantially triangular plate shape that comes into contact with the side surface so as to cover the side surface of the contact portion 31 of the contact displacement member 3. The attachment portion 51 is provided with an attachment hole 53. The attachment hole 53 is aligned with the screw holes 34 of the three contact portions 31, and the attachment portion 51 is brought into contact with the side surface of the contact portion 31. In this state, the attachment portion 51 is integrally attached to the three contact displacement members 3 (contact portions 31) by sequentially screwing screw members such as screws into the screw holes 34 of the three contact portions 31 through the attachment holes 53. It is like that. Further, when the attachment portion 51 is attached to the contact portion 31, the contact piece 52 of the attachment 5 is prevented from moving away from the rebar 10 by engaging with the lower surface of the contact portion 31 of the contact displacement member 3. An engaging portion 54 is provided. In addition, if the engagement part 54 can prevent the contact piece 52 of the attachment 5 from moving in the direction away from the reinforcing bar 10, the engagement part to the contact displacement member 3 is not limited to the contact part 31, but the detection part. 32 may be sufficient and the shape is not specifically limited, either.

  The contact piece 52 includes a plate-like placement body 55 placed on the distal end side of the upper surface of the contact portion 31 of the three contact displacement members 3, and the distal end side end portion of the placement body 55 is bent upward at a right angle. The vertical body 56 and the contact body 57 that inclines from the vertical body 56 toward the tip side and contacts the reinforcing bar surface. Side surfaces of the mounting body 55 and the vertical body 56 of the contact piece 52 are fixed to the mounting portion 51. The width of the contact piece 52 (the length in the axial direction of the reinforcing bar 10) is arbitrarily set as long as the flat portion 12a of the screw joint reinforcing bar 12 can be detected. For example, as shown in FIG. It is preferable to be formed in a size that covers the three contact portions 31 that are arranged to be open.

  The contact displacement member 3 and the sensor 4 are integrally moved in the vertical and horizontal directions orthogonal to the axis of the reinforcing bar 10 by a moving mechanism. The moving mechanism includes, for example, a moving table and a moving member that move in the vertical and horizontal directions orthogonal to the axis of the reinforcing bar 10 placed on the reinforcing bar receiving rollers 21 and 21, and the contact displacement member 3 is attached to the moving table and the moving member. And a sensor 4 are arranged.

  Next, the operation of the detection apparatus 1 configured as described above will be described. The bamboo reinforcing bar 11 is placed on the reinforcing bar receiving rollers 21 and 21, and the reinforcing bar receiving rollers 21 and 21 are rotated by the driving roller to rotate the bamboo reinforcing bar 11 around the axis. At this time, the contact portions 31 of the three contact displacement members 3 are kept in contact with the surface of the bamboo rebar 11. When the bamboo rebar 11 rotates, the contact portion 31 (contact displacement member 3) that is in contact with the surface of the bamboo rebar 11 is displaced by the unevenness of the surface.

  In other words, the contact displacement member 3 is configured such that when the bamboo rebar 11 rotates while the contact portion 31 is in contact with the lower part of the surface of the bamboo rebar 11, the contact portion 31 of the sensor 4 is in contact with the rib 11 a and the node 11 b. When the detection unit 32 does not block the optical path between the light source and the light receiving unit and the contact unit 31 is in contact with the surface between the nodes 11b and 11b, the detection unit 32 is provided to block the optical path. When the contact portion 31 is in contact with a portion other than the rib 11a, the contact displacement member 3 is arranged such that at least one of the contact portions 31 is located between the nodes 11b and contacts the reinforcing bar surface of the portion. Three are provided at intervals in the axial direction.

  For this reason, when the three contact parts 31 contact the rib 11a, all three contact the rib 11a, and when they contact a part other than the rib 11a, all three contact parts other than the rib 11a. When the contact portion 31 comes into contact with a portion other than the rib 11a, at least one contact with the surface between the nodes 11b, the light path is blocked by the detection portion 32 of the at least one contact displacement member 3.

  Therefore, when the contact displacement member 3 is in contact with the rib 11a, the optical path is not blocked, and when the contact displacement member 3 is in contact with a portion other than the rib 11a, the optical path is blocked, so that the sensor 4 can detect the rib 11a. Become. Thus, since the sensor 4 detects the rib 11a by the displacement of the contact displacement member 3, only the contact displacement member 3 is worn by the contact of the reinforcing bar 10. For this reason, since the sensor 4 is not damaged, only the contact displacement member 3 needs to be replaced. Therefore, the deformed reinforcing bar rib detection device 1 having excellent maintainability can be obtained.

  If the contact location of the contact displacement member 3 (contact portion 31) is below the surface of the bamboo rebar 11, the rib 11 a can be detected without adjusting the position of the contact displacement member 3 even if the diameter of the bamboo joint rebar 11 is different. . That is, the position of the lower part of the surface of the bamboo joint 11 does not change even if the bamboo joints 11 having different diameters are placed on the reinforcing bar receiving rollers 21, 21. If the diameter of the bamboo rebar 11 is different, the position changes. In order to detect the rib 11a of the bamboo joint 11 having a different diameter, the position of the contact displacement member 3 must be adjusted each time the diameter is different.

  The contact displacement member 3 has a short length from the shaft 33 that is rotatably supported to a portion that contacts the bamboo joint reinforcing bar 11, for example, a length from the shaft 33 to a portion that is detected by the sensor 4. For example, since the length of the detection unit 32 is long, the shake of the detection unit 32 becomes large even with a small step, so that the rib 11a can be reliably detected. Further, since the contact displacement member 3 is formed in an L-shape in which the length of the contact portion 31 is short and the length of the detection portion 32 is long, the sensor 4 is connected to the reinforcing bar receiving rollers 21 and 21 and the reinforcing bar receiving below the reinforcing bar. It can arrange | position between the driving rollers etc. which drive the rollers 21 and 21, and can attain compactization.

  Further, by attaching the attachment 5 for the screw rebar to the contact portion 31 of the contact displacement member 3, the contact point of the contact displacement member 3 with the deformed rebar 10 becomes the side from the bottom to the flat side of the screw rebar 12. The part 12a can be detected. In other words, the deformed reinforcing bar 10 is placed on the reinforcing bar receiving rollers 21 and 21 and is rotated by the rotation of the reinforcing bar receiving rollers 21 and 21. If the deformed reinforcing bar 10 is a threaded reinforcing bar 12, as shown in FIG. Since the screw rebar 12 rotates while being eccentric, if the contact location of the contact displacement member 3 is at the lower part of the surface of the rebar 10, the flat portion 12a may not be detected. That is, when the threaded reinforcing bar 12 rotates eccentrically on the reinforcing bar receiving rollers 21 and 21, when the reinforcing bar rotates once, the lower part of the surface of the reinforcing bar is positioned at the lowest position in the four corners 12c. Since it is when it is positioned downward (line A shown in FIG. 4) (see FIGS. 4A and 4C), the flat portion 12a cannot be detected. On the other hand, when the reinforcing bar is rotated once, the side of the surface of the reinforcing bar 12 is positioned on the outermost side in the case shown in FIG. 4A (line B shown in FIG. 4) and 180. 2 times when rotating in degrees. For this reason, if the two times are detected, the flat portion 12a can be positioned at a desired position by stopping the rotation of the reinforcing bar 12 after a predetermined number of seconds. That is, the flat portion 12a can be detected. FIG. 4 is a schematic diagram illustrating the state when the threaded bar revolves on the reinforcing bar receiving roller in an easy-to-understand manner.

  Therefore, by making the contact location of the contact displacement member 3 from the lower side to the side, it becomes possible to detect the flat portion 12a of the screw rebar 12 and the attachment mechanism 5 is moved by moving the contact displacement member 3 and the sensor 4 by the moving mechanism. By adjusting the position of the contact piece 52 so as to contact the side of the screw rebar 12, the flat portion 12 a of the screw rebar 12 can be detected.

  At this time, the flat part 12a of the screw joint reinforcing bar 12 is securely provided by providing the engaging part 54 on the attachment part 51 of the attachment 5 to prevent the contact piece 52 of the attachment 5 from moving away from the reinforcing bar. Can be detected. The attachment 5 is formed so that the attachment portion 51 is integrally attached to the three contact displacement members 3, and the contact piece 52 is formed on the three contact portions 31. Thus, the flat portion 12a of the screw joint reinforcing bar 12 can be reliably detected.

  When the threaded reinforcing bar 12 rotates eccentrically on the reinforcing bar receiving rollers 21 and 21, when the reinforcing bar 12 makes one rotation, the lower part of the surface of the reinforcing bar 12 is positioned at the uppermost position. Since the part 12a is positioned below, the flat part 12a can be detected from the displacement of the detection part 32. In this case, it is sufficient if the flat portion 12a is flat. However, since the flat portion 12a may not be flat, when the flat portion 12a is flat, the flatness of the screw rebar 12 is not used without using the attachment 5. The part 12a may be detected.

  Further, in the above-described detection device 1, the rib 11 a and the flat portion 12 a extending in the axial direction of the bamboo joint reinforcing bar 11 and the screw joint reinforcing rod 12 can be detected. Only the flat portion 12a of the reinforcing bar 12 may be detected, that is, a detecting device for screw joint reinforcing bars may be used. In this detection apparatus, the number of the contact displacement members 3 may be one, and the width (the length of the reinforcing bar in the axial direction) is not limited. Moreover, the contact displacement member 3 is formed so that the contact part 31 contacts the side of the reinforcing bar surface. The other configuration is the same as that of the detection device 1 described above. Thereby, the flat part 12a of the screw rebar 12 can be detected. Moreover, the flat part 12a of the screw joint reinforcing bar 12 from which a kind (diameter) differs can be detected by providing a moving mechanism.

DESCRIPTION OF SYMBOLS 1 Detection apparatus 2 Reinforcing bar rotation mechanism 3 Contact displacement member 4 Sensor 5 Attachment 10 Reinforcing bar 11 Bamboo joint reinforcement 11a Rib 12 Screw joint reinforcement 12a Flat part 21 Reinforcement receiving roller 31 Contact part 32 Detection part 41 Sensor main body 42 Reflector 51 Attachment part 52 Contact piece 54 engaging portion

Claims (3)

A detecting device for detecting a flat portion extending along the axial direction of the surface of the screw section reinforcing bars, reinforcing bars having a pair of reinforcing bar receiving rollers for rotating the screw section reinforcing bar is placed in a state of lying on its side A contact displacement member provided at a lower portion of the screw joint reinforcing bar placed on the reinforcing bar receiving roller and displaced by a concavo-convex shape on the surface of the screw joint reinforcing bar rotated by the reinforcing bar rotating mechanism, the screw comprising a contact displacement member having an attachment for a contact to the section reinforcing bar surface on the side of the peripheral surface of the screw section reinforcement and a sensor for detecting the flat portion by the displacement of the contact displacement member, further,
An L-shape in which a contact displacement member provided with the attachment is rotatably supported at a location where a short side portion extending in a direction orthogonal to the axis of the threaded joint bar and a long side portion which is a detection target of the sensor intersect. Formed of a member, the short side portion is urged toward the surface of the reinforcing bar and provided so as to be swingable,
The sensor has a light source that irradiates light provided across the contact displacement member and a light receiving portion that receives light source light, and an attachment of each contact displacement member is a surface between the screw portions of the screw joint reinforcing bar. The contact displacement member is configured to block the optical path between the light source and the light receiving unit when in contact with the light source, and to displace when the attachment of the contact displacement member contacts the flat portion so as not to block the optical path. An apparatus for detecting a flat portion of a screw rebar. The attachment includes an attachment portion that is attached to all short sides of the plurality of contact displacement members, and a contact piece that is fixed to the attachment portion and contacts the side of the reinforcing bar when the contact displacement member is provided in a plurality. The flat part detection part of the screw joint of Claim 1 which has these. 3. The apparatus for detecting a flat portion of a screw joint reinforcing bar according to claim 1, wherein the contact displacement member and the sensor are provided with a moving mechanism that moves in the vertical and horizontal directions orthogonal to the axis of the reinforcing bar.

Images