Rod-shaped body and cylindrical body

Abstract

To provide a means capable of easily positioning and fixing a cylindrical body at a desired axial position of the rod-shaped body, improving the connectivity between rod-shaped bodies, and improving the pull-out strength of solidifying fluids such as concrete, mortar, and resin in the buried state.SOLUTION: The rod-shaped body has a reduced-diameter surface that exists in a predetermined region and is formed by gradually reducing the radius from the axis toward the central portion in the circumferential direction of the region, a rib that is arranged in a row in the axial direction and projects outward in the radial direction, and a concave radial surface that is recessed by alternating with the rib in the axial direction. The rib has a tip portion at a radial end portion, and a ridge line formed by the tip portion extends in a direction perpendicular to the axis and both ends thereof extend toward the reduced-diameter surface.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a rod-shaped body and a cylindrical body.

Background Art

[0002] Conventionally, when constructing a reinforced concrete structure, it is necessary to make the reinforcing bars embedded in the concrete long. However, the length of the reinforcing bars is restricted due to transportation constraints and the like, and they were joined on-site to make them longer. A joint is used for joining the reinforcing bars, and the reinforcing bars are connected by inserting the reinforcing bars into the openings at both ends of the joint (see, for example, Patent Document 1). As the reinforcing bars, threaded bars, deformed steel bars having longitudinal ribs and transverse ribs (see, for example, Patent Document 2), and deformed reinforcing bars in which a large number of ridges parallel to each other in the longitudinal direction are arranged at substantially equal intervals over the entire axial length of the reinforcing bar on a part of the outer peripheral surface of a reinforcing bar having a substantially circular cross section (see, for example, Patent Document 3) are used. Also, as a known frame rack, one including four columns (rod-shaped bodies), a plurality of sleeves, and a plurality of shelf boards is known. A plurality of fitting grooves are formed at various heights on the columns. The outer edge of the sleeve has a tapered shape and can sandwich the column, and has a convex edge that can be fitted with the fitting groove. Further, at the corner positions of the shelf board, fitting portions as joint portions having a cylindrical shape are arranged, and tapered fitting through holes are formed in the fitting portions. Such a frame rack fixes the shelf board to four columns installed perpendicular to the ground through the fitting portions, positions by fitting the convex edge of the sleeve into a fitting groove at an appropriate height, and positions the shelf board by fitting the sleeve into the fitting through hole of the fitting portion.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0004] For the joint described in the above-mentioned Patent Document 1, since it is necessary to fill the inside of the reinforcing bar housing portion in which the reinforcing bars are loosely fitted with grout, operations such as grout transportation and kneading at the construction site are generated, and the work burden becomes large. In addition, although grout is filled from the injection hole provided at the central portion in the longitudinal direction of the joint with the reinforcing bars loosely fitted in the reinforcing bar housing portion, grout leaks from the openings at both ends in the longitudinal direction of the joint during filling and cannot be filled to full capacity. Therefore, it is necessary to tighten nuts at both ends of the joint to close the openings at both ends of the joint. Due to these matters, there are many problems such as an increase in the number of required parts and the labor of work, and it takes time and effort to align the axes of the two reinforcing bars inserted into the joint.

[0005] In addition, rod-shaped bodies such as deformed steel bars described in the above-mentioned Patent Document 2 and deformed reinforcing bars described in Patent Document 3 have a problem that their adhesion to concrete is poor when embedded in concrete compared to threaded reinforcing bars and the like. Also, although female threads can be screwed together, there is a problem that it is difficult for the ribs to be screwed into the spiral grooves of the female threads because the width shape of the ribs does not change in the circumferential direction.

[0006] In addition, the fitting portion used for a known frame rack is fixed to a support by interposing a sleeve, so the number of parts increases. Also, the sleeve may crack after starting to be used. When a crack occurs in the sleeve, the shelf board may fall, so there is a problem of lack of safety.

[0007] The present invention has been made by the intensive research of the inventor in view of the above problems, and by a simple structure, it is possible to easily position and fix a cylindrical body at a desired axial position of a rod-shaped body, improve the connectivity between rod-shaped bodies, and provide a means for improving the pull-out strength in an embedded state with respect to a solidifying fluid such as concrete, mortar, or resin.

Means for Solving the Problem

[0008] The In one aspect rod-shaped body of the present invention has a reduced-diameter surface that exists in a predetermined region and whose radius from the axis gradually decreases toward the central portion in the circumferential direction of the region, ribs arranged in the axial direction and protruding radially outward, and recessed-diameter surfaces that are recessed alternately with the ribs in the axial direction. The ribs the above-mentioned in the radial outward direction projecting have end forms a linear shape tips, and depicted by the linear shape the ridge lines the above-mentioned are in the perpendicular to axial extends direction and both ends extend toward the reduced-diameter surface. In addition, the rod-shaped body of the present invention is characterized in that the rib projects most radially outward at the central part, and the radial projection length gradually decreases toward the circumferential end part.

[0009] Further, the rod-shaped body of the present invention is characterized in that the ribs have four surfaces facing in different normal directions.

[0010] Further, the rod-shaped body of the present invention is characterized in that the ribs have sharp-shaped circumferential ends.

[0011] Further, the rod-shaped body of the present invention is characterized in that the tip portions are both end portions in the circumferential direction, and each has a substantially triangular pyramid shape with a cubic curved surface that is smaller than the curved and slender triangular pyramid space region surrounded by the virtual extension surfaces formed by extending the four surfaces in the rotation direction around the axis. This enables the ribs to be smoothly inserted into the concave portions without getting caught between the ends of the concave portions formed on the inner circumferential surface of the cylindrical body when fitting into the cylindrical body.

[0012] Further, the rod-shaped body of the present invention is characterized in that the ribs and the recessed-diameter surfaces are arranged in two regions symmetric with respect to the axis, and in these two regions, the ribs and the recessed-diameter surfaces are arranged such that their axial positions are different.

[0013] Further, the rod-shaped body of the present invention is characterized in that the ribs have a substantially quadrangular pyramid shape in the deployed state.

[0014] In addition, the cylindrical body of the present invention is a cylindrical body having an inner peripheral surface that can surround a rod-shaped body, wherein the inner peripheral surface has a large-diameter surface with a substantially equal distance from the axis, an engaging convex portion that protrudes inward in the circumferential direction from the large-diameter surface and is arranged in a row in the axial direction, and a concave portion that is recessed alternately with the engaging convex portion in the axial direction. The concave portion is characterized in that the rib of the rod-shaped body can enter and be received from the circumferential direction and / or the radial direction.

[0015] In addition, the cylindrical body of the present invention is characterized in that the concave portion has an open end and a closed end in the circumferential direction, can receive the rib from the open end side, and can restrict the circumferential displacement of the rib by the closed end.

[0016] In addition, the cylindrical body of the present invention is characterized in that the concave portion has a guiding shape in which the open end expands in the axial direction.

[0017] In addition, the cylindrical body of the present invention is characterized in that the concave portion has a shape in which the closed end side is axially constricted.

[0018] In addition, the cylindrical body of the present invention is characterized in that the concave portion is provided with a stopper for preventing relative rotation in the reverse direction with respect to the rod-shaped body on the closed end side.

[0019] In addition, the cylindrical body of the present invention is characterized in that the middle portion of the concave portion is wider than the open end.

[0020] The cylindrical body according to claim 11, wherein the concave portion has a substantially teardrop shape.

[0021] In addition, the cylindrical body of the present invention has a hinge portion on the outer periphery, and the concave portion has a shape in which both ends in the circumferential direction are sharp and the central portion in the circumferential direction is widened. When the outer periphery is bent by the hinge portion, the inner peripheral space expands in the circumferential direction and / or the radial direction.

[0022] In addition, the cylindrical body of the present invention is characterized in that the concave portion has a substantially elliptical shape or a substantially rhombic shape.

[0023] Further, the cylindrical body of the present invention is characterized in that the circumferential direction is composed of two or more divided bodies divided into two or more parts.

[0024] Further, the cylindrical body of the present invention is characterized in that the divided body is integrally formed by a biasing member so that the inner peripheral space can be expanded in the circumferential direction and / or the radial direction.

[0026] Further, the cylindrical body of the present invention is characterized in that the outer peripheral surface has a shape twisted in one direction in a spiral shape.

[0027] Further, the cylindrical body of the present invention has a thin-walled portion on the outer periphery and / or the inner periphery, the concave portion has a shape in which both ends in the circumferential direction are sharp and the central portion in the circumferential direction is widened, and the inner peripheral space is deformed in the circumferential direction and / or the radial direction by elastic deformation of the thin-walled portion.

[0028] Further, the cylindrical body of the present invention has a mounting portion for mounting a rotation control mechanism that can surround the rod-shaped body inside, and the mounting portion can restrict displacement of the rotation control mechanism along the radial direction and / or the axial direction.

[0029] Further, the cylindrical body of the present invention is characterized in that the rotation control mechanism has an inner peripheral surface that engages with the rod-shaped body to restrict relative rotation with the rod-shaped body.

[0030] Further, the cylindrical body of the present invention includes angle restricting means for restricting the rotation angle of the rod-shaped body along the rotation direction when the concave portion receives the rib in a state before the concave portion receives the rib, first restricting means for restricting the rod-shaped body from rotating in a direction opposite to the rotation direction of the rod-shaped body when the concave portion receives the rib, and second restricting means for restricting the rod-shaped body from rotating in the opposite direction after the concave portion receives the rib.

[0031] In addition, in the rod-shaped body of the present invention, the rotation control mechanism has a shape in which a part in the circumferential direction is interrupted, and can transition between an expanded state in which it elastically deforms in the radial direction and / or the circumferential direction and the end portions in the circumferential direction are separated from each other, and a reduced state in which the end portions are in contact with each other and closed. Moreover, the rod-shaped body of another aspect of the present invention is a cylindrical body having an inner circumferential surface that can surround the rod-shaped body. The inner circumferential surface has a large-diameter surface with a substantially equal distance from the axis, an engaging convex portion that projects more radially inward than the large-diameter surface and is arranged in a row in the axial direction, and a concave portion that is recessed alternately with respect to the engaging convex portion in the axial direction and into which the rib of the rod-shaped body can enter and be received from the circumferential direction and / or the radial direction. The concave portion has a shape in which both circumferential ends are sharp and the circumferential central portion is widened. When the outer circumference is bent by the hinge portion, the inner circumferential space expands in the circumferential direction and / or the radial direction. Furthermore, the rod-shaped body of another aspect of the present invention is a cylindrical body having an inner circumferential surface that can surround the rod-shaped body. The inner circumferential surface has a large-diameter surface with a substantially equal distance from the axis, an engaging convex portion that projects more radially inward than the large-diameter surface and is arranged in a row in the axial direction, and a concave portion that is recessed alternately with respect to the engaging convex portion in the axial direction and into which the rib of the rod-shaped body can enter and be received from the circumferential direction and / or the radial direction. The cylindrical body is characterized in that the circumferential direction is composed of two or more divided bodies divided into two or more parts.

Advantages of the Invention

[0032] According to the present invention, with a simple structure, it is possible to easily position and fix the cylindrical body at a desired axial position of the rod-shaped body, improve the connectivity between the rod-shaped bodies, and improve the pull-out strength in the embedded state with respect to curable fluid materials such as concrete, mortar, and resin (also referred to as curable filling materials).

Brief Description of the Drawings

[0033]

Figure 1

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MODE FOR CARRYING OUT THE INVENTION

[0034] The following describes an embodiment of a fitting structure formed by a rod-shaped body (a steel bar for reinforcing a hydraulic solidification body embedding type) and a cylindrical body (a fixing cylindrical body) of the present invention with reference to the drawings. The fitting structure inserts the rod-shaped body into the inner circumference of the cylindrical body and rotates one of the rod-shaped body and the cylindrical body relative to the other to fit and fix both of them.

[0035] FIG. 1 shows the rod-shaped body 1 of the present embodiment, (a) is a front view, and (b) is a sectional view taken along line A-A. FIG. 2 is a view showing the rib 4 of the rod-shaped body of the present embodiment. The rod-shaped body 1 is, for example, a long member such as a substantially male screw-like or screw-threaded deformed bar-like shape or a reinforcing bar as a reinforcing steel bar. The rod-shaped body 1 has a reduced diameter surface 2 that exists in two predetermined regions facing each other across the axis and extends in the axial direction, and the radius from the axis gradually decreases toward the center in the circumferential direction of the region, ribs 4 arranged in the axial direction and protruding radially outward, and a concave diameter surface 6 recessed alternately with the ribs 4 in the axial direction. Note that the rod-shaped body 1 can be constituted by an appropriate material such as steel.

[0036] Note that the concave diameter surface 6 is set so that the distance from the axis is within the range of the distance from the axis in the reduced diameter surface 2. For example, the concave diameter surface 6 can set the distance from the axis so as to be a distance corresponding to the radius at the center in the circumferential direction of the reduced diameter surface 2.

[0037] As shown in FIG. 2, the rib 4 has a tip portion 10 at the radially outer end, and a ridge line 12 forming the tip portion 10 extends in a direction perpendicular to the axis and both ends face the reduced diameter surface 2. The rib 4 is composed of four surfaces 14a to 14d facing in different normal directions.

[0038] The four surfaces 14a to 14d form a substantially quadrangular pyramid shape when the outer peripheral surface of the rod-shaped body 1 is developed on a virtual plane (development state). Here, among the four surfaces 14a to 14d, the upper left in the direction shown in FIG. 2 is the surface 14a, the lower left is the surface 14b, the upper right is the surface 14c, and the lower right is the surface 14d.

[0039] The ridge line 12 that forms the boundary between surface 14a and surface 14b, and between surface 14c and surface 14d, extends in a direction perpendicular to the axis, and both ends are directed towards the reduced-diameter surface 2. Also, surfaces 14a to 14d have a shape that tapers in the axial direction of the rod-shaped body 1 towards the circumferential end portions located on the reduced-diameter surface 2 side, that is, a shape with a reduced width. Therefore, the rib 4 forms a tip portion 10 with a sharp circumferential end.

[0040] Note that the tip portion 10 may have a substantially acute-angled, substantially obtuse-angled, or substantially arc-shaped cross-sectional shape, or may be in a slightly flat surface shape, but preferably, it is in a slightly arc-shaped form. Also, the rib 4 and the reduced-diameter surface 6 are provided in two regions that are opposite to each other across the axis, and the axial positions of the ribs 4 and the reduced-diameter surfaces 6 are set to be stepped in each region. That is, the reduced-diameter surface 6 of the other region is arranged at the position of the rib 4 in one region across the axis. Also, the rib 4 of the other region is arranged at the position of the reduced-diameter surface 6 in one region. Of course, the axial positions of the rib 4 and the reduced-diameter surface 6 may be set to coincide with each other.

[0041] Also, the rib 4 protrudes most radially outward at the central portion, and the radial protrusion length gradually decreases towards the circumferential end portions. That is, the ridge line 12 of the rib 4 is arranged inside the virtual circle C with a radius from the axis of the rod-shaped body 1 shown in Fig. 1(b) to the point where the protrusion length of the rib 4 is the longest. Also, the rib 4 has a circumferential end portion connected to the reduced-diameter surface 2 and has an end face 4a that is substantially flush with the reduced-diameter surface 2.

[0042] The connection of the rib 4 to the reduced-diameter surface 2 may be made, for example, by setting the ridge line 12 in the shape of a curve 13a at the circumferential end portion of the rib 4 as shown in Fig. 3(a), or by setting the ridge line 12 in the shape of a straight line 13b at the circumferential end portion of the rib 4 as shown in Fig. 3(b).

[0043] Also, Fig. 4 shows another shape of the rib 4, (a) is a side view, (b) is a front view, (c) is a cross-sectional view taken along line B-B of (a), and the rib 4 may be set so that the radial protrusion length becomes substantially zero at the circumferential end portion as shown in Fig. 4. At this time, the rib 4 is set so that the protrusion length gradually decreases at a substantially constant rate. Of course, the protruding length of the rib 4 is not limited to a shape that gradually decreases along the circumferential direction, and may be a substantially constant shape in a predetermined region extending from the central portion to the circumferential end portion. However, at the circumferential end portion, the ridge line 12 is set in the shape of the curve 13a or the straight line 13b and connected to the reduced-diameter surface 2.

[0044] Further, the tip portions of the rib 4 are at both end portions in the circumferential direction, and are each set to be smaller than a curved and slender triangular pyramid space region surrounded by virtual extension surfaces formed by extending four surfaces 14a to 14d in the rotational direction about the axis, and may form a substantially triangular pyramid shape having a cubic curved surface. That is, both end portions in the circumferential direction of the rib 4 may form a cubic curved surface whose protruding length in the direction orthogonal to the axis gradually decreases so as to be located radially inward of the surfaces 14a to 14d. Further, this cubic curved surface may form a substantially triangular pyramid shape, but of course, may also be a curved surface shape. Further, the rib 4 may have a shape in which both end portions are not connected to the reduced-diameter surface 2, that is, a length that can be separated from the reduced-diameter surface 2 in the circumferential direction.

[0045] Next, the cylindrical body 20 will be described. The cylindrical body 20 is a concept including, for example, a joint for connecting two rod-shaped bodies 1, a fixing nut fixed to the end portion of a bar-shaped body 1 like a reinforcing bar, a shelf support fitting fixed in the middle of the bar-shaped body 1, etc., has openings at both ends by through holes, and has an inner peripheral shape capable of surrounding the rod-shaped body 1.

[0046] FIG. 5 shows the cylindrical body 20 of the present embodiment, (a) is a plan view, and (b) is a cross-sectional view. The cylindrical body 20 has an inner peripheral surface surrounding the rod-shaped body 1, and the inner peripheral surface is configured to have a large-diameter surface 22 arranged at positions facing each other across the axis, and an engaging convex portion 24 and a concave portion 26 positioned in the circumferential direction with respect to the large-diameter surface 22.

[0047] The large-diameter surface 22 is set to be located radially outside the rib 4 when the distances from the axis are substantially equidistant and the rod-shaped body 1 is surrounded. That is, the radius is set to be larger than that of the rib 4. Note that the large-diameter surface 22 is not limited to having substantially equidistant distances from the axis, and may be set such that the distance from the axis changes along the circumferential direction as long as it is at least non-contact with the rib 4.

[0048] The engaging convex portions 24 protrude inward in the circumferential direction from the large-diameter surface 22 and are arranged in a plurality of rows in the axial direction. Further, when the rod-shaped body 1 is surrounded, the distance from the axis of the engaging convex portions 24 is set to be located radially outside the reduced-diameter surface 2.

[0049] The concave portion 26 is a recess having a concave shape relative to the engaging convex portion 24 and is alternately arranged with the engaging convex portion 24 in the axial direction. The depth of the concave portion 26 is set such that the bottom is arranged at least radially outside the rib 4. That is, the depth of the concave portion 26 can be set such that the distances from the axis are substantially equidistant and can be continuously arranged to form a substantially continuous surface with the large-diameter surface 2. Of course, the depth of the concave portion 26 may be set such that the distance from the axis is longer than that of the large-diameter surface 22.

[0050] Further, one end in the circumferential direction (the left end in FIG. 5(b)) of the concave portion 26 is an open end 28 with an expanded width, has a shape that gradually narrows toward the other end (the right end in FIG. 5(b)), and the other end is a closed end that restricts the circumferential displacement of the rib 4. Here, a wall-shaped stopper 29 protruding radially from the bottom surface of the concave portion 26 is arranged on the other end side to form the closed end. Further, the radial protruding length of the stopper 29 is set to restrict at least the circumferential displacement of the rib 4.

[0051] Further, corresponding to the ribs 4 and the concave diameter surfaces 6 of the rod-shaped body 1, the engaging convex portions 24 and the concave portions 26 are arranged in two regions facing each other across the axis, and the engaging convex portions 24 in one region and the engaging convex portions 24 in the other region are set such that their axial positions are stepped with respect to each other. Here, FIG. 6 is a cross-sectional view showing the cylindrical body 20 and shows the positional relationship between the engaging convex portions 24 and the concave portions 26 in two regions separated from each other in the radial direction and facing each other. As shown in FIG. 6, a concave portion 26 is arranged in the other region located on the right side with respect to the engaging convex portion 24 in one region located on the left side, and an engaging convex portion 24 is arranged in the other region with respect to the concave portion 26 in one region.

[0052] Therefore, similar to the ribs 4 and the concave diameter surfaces 6 of the rod-shaped body 1, by making the engaging convex portions 24 and the concave portions 26 stepped, the ribs 4 of the rod-shaped body 1 can be fitted into the respective concave portions 26. In the case where the rod-shaped body 1 has a shape in which the axial positions of the ribs 4 and the concave diameter surfaces 6 are made to coincide with each other in two regions facing each other across the axis, the axial positions of the engaging convex portions 24 and the concave portions 26 shall be made to coincide with each other.

[0053] Next, a procedure for fitting the rod-shaped body 1 and the cylindrical body 20 will be described. First, the rod-shaped body 1 is inserted into the through-hole of the cylindrical body 20. At this time, the reduced-diameter surface 2 of the rod-shaped body 1 is opposed to the engaging convex portions 24 and the concave portions 26 of the cylindrical body 20. At this time, the rod-shaped body 1 can be inserted along the axial direction without contacting the cylindrical body 20. That is, since the reduced-diameter surface 2 is located radially inside the engaging convex portion 24 and the rib 4 is located radially inside the large-diameter surface 22, the rod-shaped body 1 can be inserted while avoiding contact with the cylindrical body 20 and can be displaced in the axial direction.

[0054] After inserting the rod-shaped body 1, the rod-shaped body 1 is relatively rotated in the circumferential direction with respect to the cylindrical body 20 and fixed to the cylindrical body 20. Here, FIG. 7 schematically shows the entry of the rib 4 into the concave portion 26, (a) is a view showing the position before entry into the concave portion 26, and (b) is a view showing the position when fitted into the concave portion 26. Note that FIG. 7 shows the inner peripheral surface of the cylindrical body 20 on the front side. Since the surfaces 14a to 14d of the rib 4 face the concave portion 26, a rod-shaped body 1 (not shown) is located on the front side of the paper surface, and the ridge line 12 and the surfaces 14a to 14d of the rib 4 (not shown) face the concave portion 26 toward the back side of the paper surface.

[0055] The rod-shaped body 1 rotates relative to the rib 4 shown in FIG. 7(a) in a rotational direction defined such that the rib 4 enters from the open end 28 into the concave portion 26. Also, the rod-shaped body 1 is rotated relative to the rib 4 shown in FIG. 7(b) until the rib 4 fits into the concave portion 26 and the leading end portion in the advancing direction of the rib 4 abuts against the closed end of the concave portion 26.

[0056] As a result, the rib 4 fits between the engaging convex portions 24, the axial position is restricted, and further, the rib 4 abuts against the closed end, restricting the circumferential displacement along the rotational direction of the rod-shaped body 1. Therefore, the rod-shaped body 1 is fixed to the cylindrical body 20, and the rod-shaped body 1 and the cylindrical body 20 are connected.

[0057] As described above, by simply rotating the rod-shaped body 1 by an appropriate amount, for example, 90°, it can be connected to the cylindrical body 20. Of course, the relative rotation angle between the rod-shaped body 1 and the cylindrical body 20 can be set as appropriate. Also, for example, even when the cylindrical body 20 functions as a joint, by inserting the rod-shaped body 1 into each end of the cylindrical body 20 and rotating each rod-shaped body 1 by an appropriate amount, it can be fixed to the cylindrical body 20 and the rod-shaped bodies can be easily connected to each other. Further, by improving the connectivity between the rod-shaped bodies, the work load can be reduced and the work efficiency can be improved. Also, since the rib 4 of the rod-shaped body 1 and the concave portion 26 of the cylindrical body 20 are arranged in a row along the axial direction, the cylindrical body can be easily positioned and fixed at a desired axial position of the rod-shaped body 1.

[0058] Also, since the rod-shaped body 1 and the cylindrical body 20 can be firmly fixed to each other only by relative rotation, there is no need to fill the space between the rod-shaped body 1 and the cylindrical body 20 with grout, mortar, etc., and operations such as transportation, kneading, and filling of grout, mortar, etc. can be omitted, the working time can be shortened, and the work efficiency can be improved. Also, in the conventional method of joining two rod-shaped bodies using threaded reinforcing bars, each rod-shaped body had to be rotated many times to be screwed into the cylindrical body, which was time-consuming and laborious. However, according to the present invention, after the rod-shaped body 1 (or the cylindrical body 20) is axially moved to a desired axial position, it can be fixed by only a small-angle rotation.

[0059] Further, the rib 4 of the rod-shaped body 1 has a substantially square pyramid shape in the deployed state and has no end face in the radial direction. As a result, in the state where the rod-shaped body 1 is embedded in concrete, substantially the entire surfaces 14a to 14d are engaged with the concrete, improving the concrete adhesion. Also, when the height of the rib 4 is made constant, the shear cross-sectional area of the concrete existing between the adjacent ribs 4 in the pulling-out direction of the rod-shaped body 1 is maximized. This is because, in the case of conventional reinforcing bars, that is, the reinforcing bars including Patent Documents 1 to 3 in which ribs having end faces in the radial direction are formed, the end faces do not contribute at all to the shear resistance in the pulling-out direction with respect to the concrete. However, in the rod-shaped body 1 of the present embodiment, since the entire surfaces 14a to 14d contribute to the shear resistance, the shear resistance is greatly improved. Therefore, the rod-shaped body 1 of the present embodiment can maximize the pulling-out resistance in the state where the whole or a part thereof is embedded in concrete and improve the pulling-out strength. Of course, it is not limited to the case where the rod-shaped body 1 is embedded in concrete which is a hydraulic hardening body. When the rod-shaped body 1 is embedded in a curable fluid such as mortar or resin, other than concrete, before curing and then cured, the pulling-out resistance can be maximized.

[0060] Also, since the tip 10 of the rib 4 has a sharp shape and the open end 28 of the concave portion 26 is widened, it is possible to prevent the relative rotation of the rod-shaped body 1 with respect to the cylindrical body 20 from being restricted when the rib 4 abuts against the engaging convex portion 24, and it is possible to make the rib 4 enter the concave portion 26 without getting caught. Therefore, the rod-shaped body 1 can be smoothly rotated relative to the cylindrical body 2.

[0061] Further, if the tip 10 of the rib 4 is made even sharper as shown in FIG. 4, the rib 4 can enter the concave portion 26 more smoothly without getting caught. Also, as long as the engaging convex portion 24 has a surface at the circumferential end, even if the tip 10 is made sharp, the rib 4 and the engaging convex portion 24 may come into contact, and the relative rotation of the rod-shaped body 1 with respect to the cylindrical body 20 may be restricted. Therefore, as shown in FIG. 8(a), it is preferable to further widen the open end 28, that is, to form an attracting shape that is greatly expanded in the axial direction, and to make the circumferential end of the engaging convex portion 24 sharp. Further, as shown in FIG. 8(b), it is more preferable to make the tip 10 and the circumferential end of the engaging convex portion 24 sharp respectively, so that the ends do not come into contact with each other, and the rib 4 can be more easily fitted into the concave portion 26, facilitating the fitting of the rod-shaped body 1 and the cylindrical body 20.

[0062] In the above-described embodiment, the rod-shaped body 1 and the cylindrical body 20 can be fixed, but it is possible to easily perform rotation in the direction opposite to the rotation direction when fixing the rod-shaped body 1 to the cylindrical body 20. Therefore, an anti-backward rotation structure may be provided between the rod-shaped body 1 and the cylindrical body 20. For example, an anti-backward rotation structure may be formed by changing the shape of the concave portion with respect to the rib 4. Here, FIG. 9 is a diagram showing another example of the inner peripheral shape of the cylindrical body 20. For example, the axial length (width) of the concave portion 30 can be reduced on the open end 32 side, that is, the open end 32 of the concave portion 30 can be made narrower than the middle portion to form an anti-backward rotation structure.

[0063] In that case, the width of the open end 32 is set to be smaller than the maximum width of the rib 4 (the width at the circumferential center). The difference between the width of the open end 32 and the maximum width of the rib 4 is set to such an extent that the rib 4 and / or the engaging convex portion 24 can be elastically deformed and the rib 4 can enter the concave portion 30.

[0064] FIG. 10 schematically shows the entry of the rib 4 into the concave portion 30. (a) is a view showing the position before entering the concave portion 30, and (b) is a view showing the position when it is fitted into the concave portion 30. In FIG. 10, the approximate positions of the surfaces 14a and 14b existing on the back side of the paper surface are indicated by the corresponding symbols of the dotted lines. As shown in FIG. 10(a), the surfaces 14a and 14b of the rib 4 abut against the engaging convex portion 24 on the open end 32 side of the concave portion 30. By pushing in against the resistance, the surfaces 14a and 14b and / or the engaging convex portion 24 are elastically deformed, and the rib 4 is made to enter the concave portion 30 as shown in FIG. 10(b).

[0065] By fitting the rib 4 into the concave portion 30 in this way, even if the rod-shaped body 1 rotates relative to the cylindrical body 20 in the reverse direction, in order for the rib 4 to come out of the concave portion 30, it is necessary to apply an external force sufficient to elastically deform the surfaces 14c and 14d and / or the engaging convex portion 24. As a result, a reverse rotation prevention structure is formed.

[0066] Note that the cylindrical body 20 may constitute a reverse rotation prevention structure depending on its outer shape. Specifically, as shown in FIG. 26, it can be configured by making each surface of the outer peripheral surface having a hexagonal cross-sectional shape be twisted in one direction in a spiral shape. In such a cylindrical body 20, when connected to the rod-shaped body and buried in concrete or the like, the direction of twist is set so that a clockwise torque can be generated on the cylindrical body 20 when a load is received in the pulling-out direction. Also, it is preferable that there are no points on the outer shape that cannot be directly visually recognized in a plan view. That is, it is preferable that there is no so-called under portion.

[0067] Also, the reverse rotation prevention structure may be formed by a member separate from the rod-shaped body 1 and the cylindrical body 20. For example, when the rod-shaped body 1 is fixed to the cylindrical body 20, the reduced-diameter surface 2 of the rod-shaped body 1 faces the large-diameter surface 22 of the cylindrical body 20, and a gap is generated between the reduced-diameter surface 2 and the large-diameter surface 22. Therefore, as shown in FIG. 11, a rotation prevention member 40 having a perforated plate shape and provided with a spacer portion 42 standing upright in a direction orthogonal to the plate surface around the hole 44 may be used to fill the gap between the reduced-diameter surface 2 and the large-diameter surface 22.

[0068] Specifically, with the tip of the spacer portion 42 facing the cylindrical body 20, the rod-shaped body 1 is inserted through the hole 44, and the rotation prevention member 40 is brought into contact with or close to the end face of the cylindrical body 20, and the spacer portion 42 is inserted between the reduced-diameter surface 2 and the large-diameter surface 22 to fill the gap. Thereby, when the rod-shaped body 1 or the cylindrical body 20 rotates in a direction in which the rib 4 retreats from the concave portion 30, the displacement of the rib 4 can be restricted by the spacer portion 42.

[0069] When disposing the rotation prevention member 40, for example, a nut may be screwed onto the rod-shaped body 1 at a position facing the cylindrical body 20 with the rotation prevention member 40 interposed therebetween to prevent the spacer portion 42 from coming off. Further, the spacer portion 42 may be in a so-called wedge shape that thickens from the base end side toward the tip end side, or the outer surface of the standing surface may be made uneven to improve the engagement property. In this case, a corresponding uneven shape may also be provided on the large-diameter surface of the cylindrical body 20. In addition, such a rotation prevention member can be applied to a conventional reinforcing bar and joint in which an axial gap is generated between the reinforcing bar and the joint when the reinforcing bar and the joint are screwed together.

[0070] In the above-described embodiment, the concave portion 26 has an open end 28 so that the rib 4 is displaced in the circumferential direction and enters the concave portion 26. However, the shape of the cylindrical body may be set so that the rib 4 fits into the concave portion 26 from the radial direction. Here, FIG. 12 is a perspective view showing another cylindrical body 50, FIG. 13 shows the cylindrical body 50, (a) is a plan view, and (b) is a front view. The cylindrical body 50 is a fixing nut-like member having a flange portion 56 disposed at one end. The cylindrical body 50 also has a hinge portion 52 formed by thinning a part of the cylindrical wall along the axial direction, and a slit 54 formed in the axial direction at a position radially opposed to the hinge portion 52 with the axis therebetween.

[0071] The flange portion 56 has a notch portion 57 formed at a location corresponding to the hinge portion 52, and has a shape that protrudes radially outward over substantially the entire circumference of the cylindrical body 50 except for the notch portion 57.

[0072] Further, FIG. 14 is a cross-sectional view of the cylindrical body 50 taken along line D-D in FIG. 13(b). The cylindrical body 50 has a concave portion 58 on its inner peripheral surface. The concave portion 58 is formed at a position where the circumferential phase is shifted by a quarter with respect to the hinge portion 52 and the slit 54. The concave portion 58 has a substantially elliptical shape, a substantially rhomboid shape, etc., and has a shape with both circumferential ends closed. The depth of the depression of the concave portion 58 is set such that the central portion is the deepest and gradually becomes shallower along the circumferential direction. That is, in the concave portion 58, the distance from the axis of the cylindrical body 50 is the longest at the central portion and gradually decreases from the central portion toward the circumferential end. Also, inside the inner peripheral surface of the cylindrical body 50, the periphery of the concave portion 58 excluding the large-diameter surface 22 is an interference surface 60, and the distance from the axis is set so as to interfere with the rib 4.

[0073] Such a cylindrical body 50 can have its cylindrical wall deformed so as to expand the slit 54. That is, for example, when a radially outward force acts on the inner peripheral surface of the cylindrical body 50, as shown in FIG. 15, the hinge portion 52 bends in a direction to expand the cylindrical wall outward, and the slit 54 expands so as not to prevent the bending of the hinge portion 52.

[0074] Therefore, when the rod-shaped body 1 is inserted into and fixed to the cylindrical body 50, when the rod-shaped body 1 is rotated relatively, the rib 4 contacts the interference surface 60 and becomes a resistance that prevents rotation. However, due to the elastic deformation of the hinge portion 52, the slit 54 opens, and the inner peripheral space defined by the inner peripheral surface expands, and the concave portion 58, the interference surface 60, etc. are displaced substantially radially outward.

[0075] As a result, the rod-shaped body 1 can be further rotated relatively, and the rib 4 can be displaced in the circumferential direction while slidingly contacting the interference surface 60. When the rib 4 is displaced to a position where it overlaps the concave portion 58, the rib 4 fits into the concave portion 58. That is, the size of the expanded inner peripheral space returns to the initial state due to the elasticity of the hinge portion 52, and the concave portion 58 is displaced relatively radially inward with respect to the rib 4 to fit the rib 4.

[0076] Note that even when the rib 4 is fitted into the concave portion 58, the cylindrical body 50 having the hinge portion 52 can be elastically deformed and the slit 54 can be expanded. Therefore, an anti-expansion member 64 shown in FIG. 16 may be provided on the cylindrical body 50 to restrict the expansion. The anti-expansion member 64 is a substantially plate-shaped member provided with a through-hole 70, and includes a spacer portion 66 disposed around the through-hole 70 and a protrusion portion 68 extending substantially parallel to the axis of the through-hole 70.

[0077] To prevent the expansion of the slit 54 of the cylindrical body 50 using the anti-expansion member 64, the spacer portion 66 is inserted into the gap between the reduced-diameter surface 2 and the large-diameter surface 22, and the protrusion portion 68 is inserted into the notch portion of the flange 56. That is, in a state where the rod-shaped body 1 is fixed to the cylindrical body 50 as shown in FIG. 17, the anti-expansion member 64 is moved toward the cylindrical body 50 while inserting the rod-shaped body 1 through the through-hole 70 with the spacer portion 66 between the reduced-diameter surface 2 and the large-diameter surface 22 and the protrusion portion 68 fitting into the notch portion 57 of the flange 56. As shown in FIG. 18, the protrusion portion 68 fits into the notch portion 57 to restrict the narrowing of the width of the notch portion 57 when the hinge portion 52 is elastically deformed, thereby preventing the slit 54 from expanding.

[0078] Further, it is desirable to form a concave portion on the end surface of the cylindrical body 50 facing the anti-expansion member 64 into which the anti-expansion member 64 fits. If the shape of this concave portion and the outer peripheral shape of the anti-expansion member 64 are the same and non-circular (or the distance from the axis of the cylindrical body 50 or the through-hole 70 is different along the circumferential direction), relative rotation of the anti-expansion member 64 with respect to the cylindrical body 50 can be prevented.

[0079] Note that although the cylindrical body 50 has been described as having a shape similar to a fixing nut, of course, it does not limit the use and can be set as appropriate. Note that although the hinge portion has been described as being elastically deformable, it is not limited thereto, and it may be constituted by an opening / closing mechanism such as a hinge and be opened and closed substantially in the circumferential direction of the cylindrical body 50.

[0080] Also, although the inner peripheral space is expanded due to the elastic deformation of the hinge portion in the cylindrical body, it is not limited to this. As shown in Fig. 19(a), the cylindrical body 50 may be divided in the circumferential direction, and the divided bodies 50a and 50b may be held by a biasing member so as to be displaceable in the radial direction. Note that the cylindrical body may be divided into three or more parts. The biasing member may be, for example, a coil spring formed in an annular shape, a ring spring, a wiring wound around the outer peripheral surface of the cylindrical body 50 such as a wire ring, or a leaf spring wound around the cylindrical body 50 so as to correspond thereto.

[0081] Also, as shown in Fig. 19(b), the biasing member 80 may be a compression spring or the like connected to the opposing surfaces of the divided bodies 50a and 50b so as to connect the divided bodies 50a and 50b to each other. Further, as shown in Fig. 19(c), the cylindrical walls arranged between the opposing surfaces of the divided bodies 50a and 50b may be made thin and bent into a bellows shape or the like so as to have spring properties to constitute the biasing member 80. According to these configurations, the divided bodies 50a and 50b are integrated via the biasing member 80 so that the inner peripheral space can be expanded in the circumferential direction and / or the radial direction.

[0082] Also, the cylindrical body 50 may be formed with a plurality of thin-walled portions having a reduced wall thickness in the circumferential direction, and the through-hole may be deformed by the elastic deformation and bending of the thin-walled portions so that the rib 4 can be fitted into the concave portion 58. Specifically, for example, as shown in Fig. 20, the cylindrical body 50 is set such that the shape of the through-hole substantially corresponds to the shape of the rod-shaped body 1 and the outer shape is substantially oval and the large-diameter surface 22 is located at the short-radius portion. As a result, the thin-walled portion 90 is formed at the short-radius portion. Further, the flange 56 may be provided with a slit 92 in parallel with the thin-walled portion 90 in the axial direction and the radial direction. Here, the shape of the slit 92 is a shape that does not prevent the elastic deformation of a predetermined range of the thin-walled portion 90. Here, the cut width is widened toward the proximal end side of the flange 56, that is, the side closer to the thin-walled portion 90, and gradually narrowed toward the radial end portion. Of course, the cut width of the flange 56 may be appropriately set as long as it does not prevent the deformation of the thin-walled portion 90, and may be substantially constant along the radial direction, or may be gradually widened along the radial direction.

[0083] In such a cylindrical body 50, when the rod-shaped body 1 is inserted into the through-hole such that the rib 4 of the rod-shaped body 1 faces the large-diameter surface 22 and the rod-shaped body 1 is rotated relative to the cylindrical body 50, the rib 4 contacts the interference surface 60 and becomes a resistance that hinders rotation. However, due to the elastic deformation of the thin-wall portion 90, the inner peripheral space (through-hole) defined by the inner peripheral surface deforms in the circumferential direction and / or the radial direction, and the concave portion 58, the interference surface 60, etc. are displaced substantially radially outward.

[0084] Further, the formation of the thin-wall portion 90 is achieved by making the outer shape of the cylindrical body 50 into an oval shape, but it is not limited to this. For example, the thin-wall portion 90 may be formed by making the outer shape of the cylindrical body 50 into a substantially circular shape and setting the position of the large-diameter surface 22 of the cylindrical body 50 further radially outward.

[0085] Note that a rotation control mechanism for controlling the relative rotation of the two members that engage with the cylindrical body and the rod-shaped body may be provided. Here, FIG. 21 shows a rotation control ring 100 as the rotation control mechanism, (a) is a perspective view, (b) is a plan view, and (c) is a side view. The rotation control ring 100 is a substantially annular member with a part of the circumferential direction cut off, and has a shape that is twisted so that the axial positions of the circumferential end portions 100a and 100b are different from each other. Further, the rotation control ring 100 has a part of the circumferential direction formed into a thin wall so that it can be elastically deformed in the circumferential direction. That is, the rotation control ring 100 transitions between an expanded state in which the end portions 100a and 100b are separated in the circumferential direction and a contracted state in which the end portions 100a and 100b are in contact and the outer peripheral surface is closed by elastic deformation.

[0086] Further, the rotation control ring 100 has a step portion 102 due to a difference in diameter in the radial direction in the middle of the circumferential direction of the outer peripheral surface, and has a shape with different outer diameters with the step portion 102 as a boundary. Here, as shown in FIG. 21, the outer diameter in the region from the step portion 102 to the end portion 100b is set larger than the region from the step portion 102 to the end portion 100a. Therefore, the outer shape of the end portion 100b protrudes radially outward more than the end portion 100a.

[0087] The inner peripheral surface of the rotation control ring 100 corresponds to the shape of the rod-shaped body 1 as viewed in the axial direction, and is shaped to engage in the circumferential direction. That is, the inner peripheral surface is configured to have a first inner peripheral surface 104 that faces the reduced-diameter surface 2 and can interfere with the rib 4, and a second inner peripheral surface 106 that faces the rib 4 and has a larger diameter than the first inner peripheral surface 104. Therefore, when the rotation control ring 100 is surrounded around the rod-shaped body 1, the first inner peripheral surface 104 and the rib cannot face each other. Therefore, the rotation control ring 100 is oriented in the circumferential direction such that the first inner peripheral surface 104 faces the reduced-diameter surface 2 and the second inner peripheral surface 106 faces the rib 4 with respect to the rod-shaped body 1, and further engages in the circumferential direction.

[0088] FIG. 22 shows a cylindrical body 110, (a) is a plan view, (b) is a cross-sectional view taken along line A-A, and FIG. 23 is a cross-sectional view showing the inside of the mounting portion 120 as viewed in the axial direction. The cylindrical body 110 on which the rotation control ring 100 can be mounted will be described. The cylindrical body 110 is different from the above-described cylindrical body 50 in that it has a mounting portion 120 that forms an internal space for fitting and mounting the rotation control ring 100. The mounting portion 120 is located at an end opposite to the flange 54 in the axial direction, and has an axial engagement portion 122, a first circumferential engagement portion 124, and a second circumferential engagement portion 126 (see FIG. 23).

[0089] The axial engagement portion 122 is a convex portion extending over substantially the entire circumference of the open end, and protrudes radially inward to reduce the opening. The opening defined by the axial engagement portion 122 is set to a size that allows at least the rod-shaped body 1 to pass through and restricts the passage of the rotation control ring 100 in the expanded state. Of course, the axial engagement portion 122 is not limited to extending over the entire circumferential direction, and may exist intermittently in the circumferential direction.

[0090] The first circumferential direction engaging portion 124 is a stepped portion that lowers the axial position of the bottom surface of the mounting portion 120 by one step. Here, the height position of the bottom surface is set to decrease with the first circumferential direction engaging portion 124 as the boundary along the clockwise direction in plan view. Also, the first circumferential direction engaging portion 124 can engage with one of the inner ends of the rotation control ring 100, and here it is assumed to engage with the end portion 100b. The second circumferential direction engaging portion 126 is a stepped portion provided on the circumferential surface of the mounting portion 120 and convex inward in the radial direction, and can engage with the stepped portion 102 of the rotation control ring 100.

[0091] The rotation control ring 100 can be fitted into the mounting portion 120 of the cylindrical body 110 by being in a contracted state. That is, the rotation control ring 100 is pre-mounted before the rod-shaped body 1 is inserted into the cylindrical body 110. FIG. 24 is a diagram showing the transition of the orientation of the rotation control ring 100 within the cylindrical body 110, where (a) shows the orientation when the rod-shaped body 1 is inserted into the cylindrical body 110, and (b) shows the orientation when the rod-shaped body 1 and the cylindrical body 110 are connected. As shown in FIG. 24(a), the rod-shaped body 1 is inserted with the rotation control ring 100 installed in a direction where the large-diameter surface 22 is parallel to the second inner circumferential surface 106 in the radial direction.

[0092] Next, in order to connect the rod-shaped body 1 to the cylindrical body 110, the rod-shaped body 1 is relatively rotated with respect to the cylindrical body 110. However, as shown in FIG. 24(a), the radial end portion of the end surface 100b protrudes to a position where it can engage with the second circumferential direction engaging portion 126, restricting counterclockwise rotation. That is, the rotation control ring 100 exhibits an anti-backward rotation function during insertion that prevents backward rotation with respect to a predetermined direction (clockwise) when the rod-shaped body 1 is inserted into the cylindrical body 110.

[0093] When the rod-shaped body 1 is rotated clockwise by approximately 90° along the circumferential direction, the rotation control ring 100 rotates within the mounting portion 120. As shown in FIG. 24(b), the rotation control ring 100 has a stepped portion 102 engaged with the second circumferential direction engaging portion 126, restricting further clockwise rotation. Therefore, the rotation control ring 100 exhibits a connection-time rotation angle regulation function that regulates the rotation angle when the rod-shaped body 1 is connected to the cylindrical body 110 to be within 0° or more and 90° or less from the initial phase. That is, the rotation control ring 100 controls the relative phase between the rod-shaped body 1 and the cylindrical body 110 to be within 0° or more and 90° or less from the initial phase 0°, and at the 90° phase, while preventing further forward rotation, it prevents rotation to a phase less than that, i.e., reverse rotation.

[0094] Also, the end portion 100b engages with the first circumferential direction engaging portion 124. Here, FIG. 25 shows before and after the end portion 100b and the first circumferential direction engaging portion 124 engage, where (a) is a cross-sectional view showing the state before engagement, and (b) is a cross-sectional view showing the state when engaged. Note that the rod-shaped body 1 is omitted in FIG. 25. In the initial phase, the rotation control ring 100 has its axial position restricted within the mounting portion 120, and as shown in FIG. 25(a), it is held in a state of being forcibly elastically deformed axially so that the end portions 100a and 100b are parallel at substantially the same axial position.

[0095] Then, when the rotation control ring 100 rotates clockwise together with the rod-shaped body 1 and rotates 90° from the initial position, the end portion 100b passes over the first circumferential direction engaging portion 124. Here, as shown in FIG. 21, since the axial position of the end portion 100b is displaced downward with respect to the end portion 100a, as shown in FIG. 25(b), it is displaced downward along the step of the first circumferential direction engaging portion 124. As a result, the end portion 100b engages with the first circumferential direction engaging portion 124 in the circumferential direction. Therefore, the rotation control ring 100 exhibits a connection-time reverse rotation prevention function that prevents reverse rotation with respect to a predetermined direction (clockwise) when the rod-shaped body 1 and the cylindrical body 110 are connected.

[0096] Incidentally, as described above, the cylindrical portion may have a shape such as a substantially elliptical shape or a substantially rhombic shape with both circumferential ends closed. This means that it has a shape symmetric with respect to at least a symmetry axis parallel to the axial direction, including a substantially oval shape, a substantially lip shape, a substantially rugby ball shape, a substantially egg shape, etc., and further forms a closed end with both circumferential ends closed, and includes those having a shape similar or approximate to the shape of the rib in the radial direction view.

[0097] Incidentally, the cylindrical body has a concave portion with an open end where one circumferential end is widened, gradually narrowing toward the other end, and the other end is a closed end that restricts the circumferential displacement of the rib. In the so-called radial direction view, it was described as having an asymmetric shape with respect to a symmetry axis parallel to the axial direction or a symmetric shape as described above. Of course, an asymmetric concave portion and a symmetric concave portion may be arranged in series in the axial direction. The arrangement of the concave portions at that time may be an alternating arrangement of an asymmetric one and a symmetric one, or a hybrid structure with an appropriate combined arrangement such as arranging symmetric concave portions every few of a plurality of asymmetric shapes.

Explanation of Reference Numerals

[0098] 1... rod-shaped body 2... reduced diameter surface 4... rib 4a... end face 6... reduced diameter concave surface 10... tip portion 12... ridge line 14a - 14d... surfaces 20, 50... cylindrical bodies 22... large diameter surface 24... engaging convex portion 26, 30, 58... concave portions 28, 32... open ends 29... stopper 40... rotation preventing member 42... spacer portion 44... hole 52... hinge portion 54... slit 56... flange portion 57... notch portion 60... interference surface 64... expansion preventing member 66... spacer portion 68... protrusion 70... through hole 50a, 50b... divided bodies 80... biasing member, 100... rotation control ring.

Claims

1. a reduced-diameter surface that exists in a predetermined region and whose radius from the axis gradually decreases toward the circumferential center of the region, ribs arranged in the axial direction and protruding radially outward, and a concave-diameter surface recessed alternately with the ribs in the axial direction; the rib has a tip portion that forms a linear shape at an end portion protruding radially outward, and a ridgeline drawn by the linear shape extends in a direction orthogonal to the axis and both ends extend toward the reduced-diameter surface, which is a rod-shaped body.

2. The rod-shaped body according to claim 1, wherein the rib protrudes most radially outward at the central portion, and the radial protrusion length gradually decreases toward the circumferential end portion.

3. The rod-shaped body according to claim 1 or 2, wherein the rib has four surfaces facing different normal directions.

4. The rod-shaped body according to any one of claims 1 to 3, wherein the circumferential end portion of the rib has a sharp shape.

5. The rod-shaped body according to claim 3, wherein the tip portion is both end portions in the circumferential direction, and each is set smaller than a curved and slender triangular pyramid space region surrounded by virtual extension surfaces formed by extending the four surfaces in the rotational direction around the axis, and has a substantially triangular pyramid shape with a cubic curved surface.

6. The rib and the concave-diameter surface are arranged in two regions symmetric with respect to the axis center, In the two regions, the ribs and the concave-diameter surfaces are arranged such that their axial positions are different, which is the rod-shaped body according to any one of claims 1 to 5.

7. The rod-shaped body according to any one of claims 4 to 6, wherein the rib has a substantially quadrangular pyramid shape in the developed state.

8. a cylindrical body having an inner circumferential surface that can surround the rod-shaped body, the inner circumferential surface has a large-diameter surface with a substantially equal distance from the axis center, engagement convex portions that protrude radially inward from the large-diameter surface and are arranged in the axial direction, concave portions that are recessed alternately with the engagement convex portions in the axial direction, have the longest distance from the axis center at the central portion, and gradually decrease toward the circumferential end portion, The concave portion can allow the rib of the rod-shaped body to enter from the circumferential direction and / or the radial direction and receive it, which is a cylindrical body.

9. The cylindrical body according to claim 8, wherein the concave portion has an open end and a closed end in the circumferential direction, and can receive the rib from the open end side and restrict the circumferential displacement of the rib by the closed end.

10. The cylindrical body according to claim 9, wherein the concave portion has an attracting shape with an open end widened in the axial direction.

11. The cylindrical body according to claim 9 or 10, wherein the concave portion has a shape that is axially constricted on the closed end side.

12. The cylindrical body according to any one of claims 9 to 11, wherein the concave portion is provided with a stopper on the closed end side for preventing relative rotation in a direction opposite to that of the rod-shaped body.

13. The cylindrical body according to any one of claims 9 to 12, wherein the middle portion of the concave portion is wider than the open end.

14. The cylindrical body according to claim 13, wherein the concave portion has a substantially teardrop shape.

15. It has a hinge portion on the outer periphery, the concave portion has a shape in which both circumferential ends are sharp and the circumferential central portion is widened, The cylindrical body according to claim 8, wherein the inner peripheral space expands in the circumferential direction and / or the radial direction due to the outer periphery being bent by the hinge portion.

16. The cylindrical body according to claim 15, wherein the concave portion has a substantially elliptical shape or a substantially rhomboid shape.

17. The cylindrical body according to any one of claims 8 to 16, wherein the cylindrical body is composed of two or more divided bodies obtained by dividing the circumferential direction into two or more parts.

18. The cylindrical body according to claim 17, wherein the divided bodies are integrally formed so that the inner peripheral space can be expanded in the circumferential direction and / or the radial direction by a biasing member.

19. The cylindrical body according to any one of claims 8 to 14, wherein the outer peripheral surface has a shape twisted in one direction in a spiral shape.

20. It has a thin-walled portion on the outer periphery and / or the inner periphery, the concave portion has a shape in which both circumferential ends are sharp and the circumferential central portion is widened, The cylindrical body according to claim 8, wherein the inner peripheral space is deformed in the circumferential direction and / or the radial direction by elastic deformation of the thin-walled portion.

21. It has a mounting portion for mounting a rotation control mechanism capable of surrounding the rod-shaped body inside, The cylindrical body according to claim 20, wherein the mounting portion can restrict displacement of the rotation control mechanism along the radial direction and / or the axial direction.

22. The cylindrical body according to claim 21, wherein the rotation control mechanism has an inner peripheral surface that engages with the rod-shaped body to restrict relative rotation with the rod-shaped body.

23. The rotation control mechanism includes an angle restricting means for restricting the rotation angle of the rod-shaped body along the rotation direction when the concave portion receives the rib, in a state before the concave portion receives the rib; a first restricting means for restricting the rod-shaped body from rotating in a direction opposite to the rotation direction of the rod-shaped body when the concave portion receives the rib; The cylindrical body according to claim 21 or claim 22, further comprising a second restricting means for restricting the reverse rotation of the rod-shaped body after the concave portion has received the rib.

24. The rotation control mechanism has a shape with a part of the circumferential direction interrupted, and is capable of transitioning between an expanded state in which it elastically deforms in the radial direction and / or the circumferential direction and the end portions in the circumferential direction are separated from each other, and a contracted state in which the end portions are in contact with each other and closed, the cylindrical body according to any one of claims 21 to 23.

25. A cylindrical body having an inner circumferential surface capable of surrounding a rod-shaped body, wherein the inner circumferential surface has a large-diameter surface with a substantially equal distance from the axis, engagement convex portions protruding inward in the circumferential direction from the large-diameter surface and arranged in a row in the axial direction, concave portions recessed alternately with respect to the engagement convex portions in the axial direction, allowing the ribs of the rod-shaped body to enter and be received from the circumferential direction and / or the radial direction, and a hinge portion provided on the outer circumference, wherein the concave portion has a shape with both ends in the circumferential direction being sharp and the central portion in the circumferential direction being widened, and the inner circumferential space expands in the circumferential direction and / or the radial direction by the outer circumference being bent by the hinge portion, the cylindrical body being characterized thereby.

26. A cylindrical body having an inner circumferential surface capable of surrounding a rod-shaped body, wherein the inner circumferential surface has a large-diameter surface with a substantially equal distance from the axis, engagement convex portions protruding inward in the circumferential direction from the large-diameter surface and arranged in a row in the axial direction, and concave portions recessed alternately with respect to the engagement convex portions in the axial direction, allowing the ribs of the rod-shaped body to enter and be received from the circumferential direction and / or the radial direction, wherein the cylindrical body is composed of two or more divided bodies obtained by dividing the circumferential direction into two or more parts, the cylindrical body being characterized thereby.

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