JP7733981B2 - Hydraulic solidified embedded reinforcement steel rod and fixed cylindrical body - Google Patents

Description

The present invention relates to a steel rod for reinforcing hydraulically solidified materials and a fixing cylinder.

Conventionally, when constructing a structure made of reinforcing steel bars embedded in a hydraulically solidified body, it has been necessary to fix a fixing cylinder near the end of the reinforcing steel bar embedded in the hydraulically solidified body in order to improve the pull-out strength. The fixing cylinder is fixed to the reinforcing steel bar embedded in the hydraulically solidified body by inserting the reinforcing steel bar into an opening that penetrates from end to end of the fixing cylinder, thereby connecting the fixing cylinder to the end of the reinforcing steel bar (see, for example, Patent Document 1).
Examples of reinforcing steel rods for embedding in hydraulically solidified bodies include those described in Patent Document 2, and also those having a substantially circular cross section and a large number of parallel longitudinal ridges arranged in a row on part of the outer surface of the rod at substantially equal intervals along the entire axial length of the reinforcing steel rod for embedding in hydraulically solidified bodies (see, for example, Patent Document 3).

Japanese Patent Application Laid-Open No. 2018-178365 Patent No. 1227542 Japanese Unexamined Patent Publication No. 56-135658

The tubular fixing member described in Patent Document 1 requires that a hardenable filler be filled into the steel rod receiving section in which the steel rod is loosely fitted, which requires work such as transporting and mixing the hardenable filler at the construction site, resulting in a heavy workload.

Furthermore, reinforcing steel rods for embedding hydraulically solidified bodies, such as those described in Patent Document 2 and Patent Document 3, are said to have problems with the adhesion of the hydraulically solidified bodies when they are embedded. Furthermore, while some reinforcing steel rods for embedding hydraulically solidified bodies can be threaded with female threads, the width shape of the ribs does not change in the circumferential direction, making it difficult to thread the ribs onto the threaded portions of the female threads.

The present invention was developed through extensive research by the inventors in light of the above-mentioned problems, and aims to provide a means for easily positioning and fixing a fixing cylinder at the desired axial position of a reinforcing steel rod for embedded in a hydraulically solidified body using a simple structure, improving the connectivity between the reinforcing steel rods for embedded in a hydraulically solidified body, and improving the pull-out strength when embedded in the hydraulically solidified body.

One embodiment of the present invention provides a steel rod for reinforcing a hydraulically solidified body that is embedded in a predetermined region and has a tapered surface that gradually reduces in radius from the axis toward the circumferential center of the region, ribs that are arranged in a row in the axial direction and protrude radially outward, and concave surfaces that are alternately recessed in the axial direction, and the ribs have a linear tip portion at the end that protrudes radially outward , and the ridge line drawn by the linear tip portion extends in a direction perpendicular to the axis, with both ends extending toward the tapered surface.
Furthermore, the hydraulically solidified body buried reinforcing steel rod of the present invention is characterized in that the ribs protrude radially outward most at the center and the radial protrusion length gradually decreases toward the circumferential ends.

Furthermore, the present invention's steel rod for reinforcing a hydraulically solidified body embedded therein is characterized in that the rib has four surfaces whose normal directions are different from each other.

Furthermore, the hydraulically solidified body-buried reinforcing steel rod of the present invention is characterized in that the ribs have sharpened circumferential ends.

Furthermore, the hydraulically solidified body-buried reinforcing steel rod of the present invention is characterized in that the tip portion, at both circumferential end portions, has an approximately triangular pyramid shape with a three-dimensional curved surface that is smaller than the curved, slender triangular pyramid spatial area surrounded by imaginary extension planes formed by extending each of the four faces in the direction of rotation about the axis. This allows the rib to be smoothly inserted into the recessed portion formed on the inner peripheral surface of the fixing cylinder when fitted into the fixing cylinder without getting caught between the ends of the recessed portions.

Furthermore, the present invention features a steel rod for reinforcing a hydraulically solidified body embedded in a concrete structure, in which the ribs and the concave surfaces are arranged in two regions symmetrical with respect to the axis, and in which the ribs and the concave surfaces are arranged at different axial positions in the two regions.

Furthermore, the steel rod for reinforcing hydraulically solidified bodies embedded in the present invention is characterized in that the ribs form an approximately square pyramid shape when expanded.

One embodiment of the fixing cylindrical body of the present invention is a fixing cylindrical body having an inner peripheral surface capable of surrounding a reinforcing steel rod for embedding in a hydraulically solidified body, the inner peripheral surface having a large diameter surface that is approximately equidistant from the axis center, engaging protrusions that protrude circumferentially inward from the large diameter surface and are arranged in a row in the axial direction, and recessed portions that are recessed alternately into the engaging protrusions in the axial direction , with the distance from the axis center being longest at the center and gradually decreasing toward the circumferential ends , and the recessed portions are characterized in that they can receive the ribs of the reinforcing steel rod for embedding in a hydraulically solidified body by entering them from the circumferential and/or radial directions.

The fixing cylinder of the present invention is also characterized in that the recessed portion has an open end and a closed end in the circumferential direction, receives the rib from the open end side, and is capable of restricting circumferential displacement of the rib by the closed end.

The fixing cylinder of the present invention is also characterized in that the recessed portion has a guide shape in which the open end is widened in the axial direction.

The fixing cylinder of the present invention is also characterized in that the recessed portion has a shape that is axially contracted toward the closed end.

Furthermore, the fixing cylinder of the present invention is characterized in that the recessed portion has a stopper on the closed end side to prevent reverse relative rotation with the hydraulically solidified body buried reinforcing steel rod.

The fixing cylinder of the present invention is also characterized in that the recessed portion is wider at its middle than at its open end.

The fixing cylinder according to claim 11, characterized in that the recessed portion has an approximately teardrop shape.

The fixing cylindrical body of the present invention also has a hinge portion on its outer periphery, and the recessed portion has a shape that is sharp at both circumferential ends and widens in the circumferential center, and the hinge portion causes the outer periphery to bend, thereby expanding the inner circumferential space in the circumferential and/or radial directions.

Furthermore, the fixing cylinder of the present invention is characterized in that the recessed portion has a substantially elliptical or substantially diamond shape.

Furthermore, the fixing cylindrical body of the present invention is characterized in that it is composed of two or more divided bodies, each divided circumferentially into two or more parts.

The fixing cylindrical body of the present invention is also characterized in that the divided bodies are integrated by a biasing member so that the inner space can expand circumferentially and/or radially.

The fixing cylinder of the present invention is also characterized by having an outer surface that is spirally twisted in one direction.

The fixing cylinder of the present invention also has a thin-walled portion on the outer and/or inner circumference, and the recessed portion has a shape that is sharp at both circumferential ends and widens in the circumferential center, and the inner space is deformed circumferentially and/or radially by elastic deformation of the thin-walled portion.

Furthermore, the fixing cylinder of the present invention has a mounting portion for mounting a rotation control mechanism therein that can surround the hydraulically solidified body-buried reinforcing steel rod, and the mounting portion is characterized in that it can regulate the displacement of the rotation control mechanism in the radial and/or axial directions.

The fixing cylinder of the present invention is also characterized in that the rotation control mechanism has an inner surface that engages with the hydraulically solidified body-buried reinforcing steel rod and restricts relative rotation with the hydraulically solidified body-buried reinforcing steel rod.

The fixing cylinder of the present invention is also characterized in that the rotation control mechanism comprises: an angle restriction means for restricting the rotation angle of the hydraulically solidified body-embedded reinforcing steel rod along the rotation direction when the recessed portion receives the rib before the recessed portion receives the rib; a first restriction means for restricting the hydraulically solidified body-embedded reinforcing steel rod from rotating in a direction opposite to the rotation direction of the hydraulically solidified body-embedded reinforcing steel rod when the recessed portion receives the rib; and a second restriction means for restricting the opposite rotation of the hydraulically solidified body-embedded reinforcing steel rod after the recessed portion receives the rib.

Furthermore, the hydraulically solidified body-buried reinforcing steel rod of the present invention is characterized in that the rotation control mechanism has a shape in which part of the circumference is interrupted, and is capable of elastically deforming in the radial and/or circumferential directions to transition between an expanded state in which the circumferential ends are separated from each other, and a contracted state in which the circumferential ends are in contact with each other and closed.
Another aspect of the fixing cylindrical body of the present invention is a fixing cylindrical body having an inner peripheral surface capable of surrounding a hydraulically solidified body-embedded reinforcing steel rod, the inner peripheral surface having a large diameter surface that is approximately equidistant from the axis center, engaging protrusions that protrude circumferentially inward from the large diameter surface and are arranged in a row in the axial direction, concave portions that are alternately recessed in the axial direction into the engaging protrusions and allow the ribs of the hydraulically solidified body-embedded reinforcing steel rod to enter from the circumferential and/or radial directions and receive them, and a hinge portion provided on the outer periphery, the concave portions having sharpened circumferential ends and a widened circumferential central portion, and the hinge portion causes the outer periphery to flex, thereby expanding the inner peripheral space in the circumferential and/or radial directions.
Another aspect of the fixing cylindrical body of the present invention is a fixing cylindrical body having an inner peripheral surface capable of surrounding a reinforcing steel rod for embedding in a hydraulically solidified body, the inner peripheral surface having a large diameter surface that is approximately equidistant from the axis, engaging protrusions that protrude circumferentially inward from the large diameter surface and are arranged in a row in the axial direction, and recessed portions that are recessed alternately in the engaging protrusions toward the axial direction and can receive ribs of the reinforcing steel rod for embedding in a hydraulically solidified body from the circumferential and/or radial directions, and the cylindrical body is characterized in being composed of two or more divided bodies that are divided circumferentially into two or more parts.

This invention uses a simple structure to easily position and fix the fixing cylinder at the desired axial position of the reinforcing steel rod for embedded hydraulic solidification, improving the connectivity between the reinforcing steel rods for embedded hydraulic solidification and improving the pull-out strength when embedded in the hydraulic solidification.

1A and 1B show a hydraulically solidified body-buried reinforcing steel rod according to this embodiment, in which FIG. 1A is a front view and FIG. 1B is a cross-sectional view taken along line AA. 1 is a view showing a rib of a hydraulically solidified body buried type reinforcing steel bar according to an embodiment of the present invention. FIG. FIG. 2 is a cross-sectional view showing a hydraulically solidified body buried reinforcing steel rod. 10A to 10C show other examples of the shape of the rib, where (a) is a side view, (b) is a front view, and (c) is a cross-sectional view. 1A and 1B show a fixing cylinder of the present embodiment, in which FIG. 1A is a plan view and FIG. 1B is a cross-sectional view. FIG. 3 is a cross-sectional view showing a fixing cylinder. 5A and 5B are diagrams showing the rib entering the recessed portion, in which FIG. 5A is a diagram showing the position before entering the recessed portion, and FIG. 5B is a diagram showing the position when fitted into the recessed portion. 10A and 10B are diagrams illustrating examples of the shape of a tip portion. 10A and 10B are diagrams showing other examples of the inner peripheral shape of the fixing cylindrical body. 5A and 5B are diagrams showing the rib entering the recessed portion, in which FIG. 5A is a diagram showing the position before entering, and FIG. 5B is a diagram showing the position when fitted into the recessed portion. FIG. FIG. 10 is a perspective view showing another fixing cylindrical body. 1A and 1B show a fixing cylindrical body, in which FIG. 1A is a plan view and FIG. 1B is a front view. FIG. 3 is a cross-sectional view showing a fixing cylinder. 10A and 10B are diagrams illustrating the widening of a slit due to bending of a hinge portion. FIG. FIG. 10 is a perspective view showing the orientation of the expansion prevention member relative to the fixing cylinder. FIG. 10 is a view showing a fixing cylindrical body provided with an expansion prevention member. FIG. 10 is a view showing a fixing cylindrical body made up of divided bodies. FIG. 10 is a view showing a fixing cylinder. 1A, 1B, and 1C are a perspective view, a plan view, and a side view, respectively, of a rotation control ring. 1A and 1B show a fixing cylindrical body, in which FIG. 1A is a plan view and FIG. 1B is a cross-sectional view taken along the line AA. FIG. 4 is a cross-sectional view showing the inside of the mounting portion as viewed in the axial direction. 10A and 10B are diagrams showing the transition of the orientation of the rotation control ring within the fixing cylinder, where (a) shows the orientation when the hydraulically solidified body-embedded reinforcing steel rod is inserted into the fixing cylinder, and (b) shows the orientation when the hydraulically solidified body-embedded reinforcing steel rod and the fixing cylinder are connected. 10A is a cross-sectional view showing the state before engagement between the end portion and the first circumferential engaging portion, and FIG. 10B is a cross-sectional view showing the state after engagement. FIG. 10 is a view showing a fixing cylinder.

An embodiment of the fitting structure of the present invention, consisting of a reinforcing steel rod for buried hydraulically solidified material and a fixing cylinder, is described below with reference to the drawings. The fitting structure involves inserting the reinforcing steel rod for buried hydraulically solidified material into the inner periphery of the fixing cylinder, and then rotating one of the reinforcing steel rod for buried hydraulically solidified material and the fixing cylinder relative to the other, thereby fitting and fixing them together.

Figure 1 shows a reinforcing steel rod 1 for embedded hydraulically solidified bodies according to this embodiment, with (a) being a front view and (b) being a cross-sectional view taken along line A-A. Figure 2 shows a rib 4 of the reinforcing steel rod for embedded hydraulically solidified bodies according to this embodiment. The reinforcing steel rod 1 for embedded hydraulically solidified bodies is a long steel member that is embedded in the hydraulically solidified body for the purpose of reinforcing the hydraulically solidified body. The reinforcing steel rod 1 for embedded hydraulically solidified bodies has two predetermined regions facing each other across the axis, each extending in the axial direction and gradually decreasing in radius from the axis toward the circumferential center of the region, a row of ribs 4 arranged in the axial direction and protruding radially outward, and concave surfaces 6 that are alternately recessed in the ribs 4 along the axial direction.

The distance of the concave surface 6 from the axis center is set to be within the range of the distance from the axis center of the reduced diameter surface 2. For example, the distance of the concave surface 6 from the axis center can be set to be a distance equivalent to the radius of the circumferential center of the reduced diameter surface 2.

As shown in Figure 2, the rib 4 has a tip 10 at its radial end, with the ridge 12 forming the tip 10 extending perpendicular to the axis and both ends extending toward the reduced diameter surface 2. The rib 4 also consists of four surfaces 14a to 14d that face in different normal directions.

The four faces 14a to 14d form a roughly quadrangular pyramid shape when the outer surface of the hydraulically solidified body buried reinforcing steel bar 1 is unfolded (unfolded) on an imaginary plane. Of the four faces 14a to 14d, the upper left in the orientation shown in Figure 2 is face 14a, the lower left is face 14b, the upper right is face 14c, and the lower right is face 14d.

The ridges 12 that form the boundaries between surfaces 14a and 14b, and between surfaces 14c and 14d, extend perpendicular to the axis, with both ends facing the reduced diameter surface 2. Furthermore, surfaces 14a to 14d have a shape that narrows in the axial direction of the hydraulically solidified body-embedded reinforcing steel bar 1 toward the circumferential end located on the reduced diameter surface 2 side, i.e., a shape that narrows in width. Therefore, the circumferential end of the rib 4 forms a sharp tip 10.

The cross-sectional shape of the tip 10 may be substantially acute-angled, substantially obtuse-angled, or substantially arc-shaped, or may be a minute flat surface, but is preferably a minute arc-shaped.
The ribs 4 and the recessed diameter surfaces 6 are provided in two regions facing each other across the axis, and the axial positions of the ribs 4 and the recessed diameter surfaces 6 in each region are set to be staggered. That is, across the axis, the ribs 4 in one region are located at the positions of the recessed diameter surfaces 6 in the other region. Also, the ribs 4 in one region are located at the positions of the recessed diameter surfaces 6 in the other region. Of course, the axial positions of the ribs 4 and the recessed diameter surfaces 6 may be set to coincide with each other.

The rib 4 protrudes radially outward most at its center, and its radial protrusion length gradually decreases toward its circumferential ends. In other words, the ridge line 12 of the rib 4 is located inside an imaginary circle C whose radius extends from the axis of the hydraulically solidified body-embedded reinforcing steel bar 1 shown in Figure 1(b) to the point where the rib 4 protrudes the longest. The rib 4 has an end surface 4a that connects to the reduced diameter surface 2 at its circumferential ends and is substantially flush with the reduced diameter surface 2.

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

4 shows another shape of the rib 4, where (a) is a side view, (b) is a front view, and (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 at the circumferential end is approximately zero as shown in Fig. 4. In this case, the protrusion length of the rib 4 is set so that it gradually decreases at an approximately constant rate.
Of course, the protruding length of the rib 4 is not limited to a shape that gradually reduces along the circumferential direction, but may be a substantially constant shape in a predetermined region from the center to the circumferential end, but the ridge line 12 at the circumferential end is set to the curve 13a or straight line 13b as described above and connected to the reduced diameter surface 2.

Furthermore, the tip of the rib 4 may have an approximately triangular pyramid shape with a three-dimensional curved surface at both circumferential ends, each of which is set smaller than the curved, slender triangular pyramid spatial region surrounded by imaginary extension planes formed by extending the four faces 14a to 14d in the direction of rotation about the axis. In other words, both circumferential ends of the rib 4 may have a three-dimensional curved surface whose protruding length in the direction perpendicular to the axis gradually decreases so that they are located radially inward from faces 14a to 14d. Furthermore, this three-dimensional curved surface may have an approximately triangular pyramid shape, but it can also have a curved surface shape. Furthermore, the rib 4 may have a shape such that both ends are not connected to the reduced diameter surface 2, i.e., have a length that allows them to be separated from the reduced diameter surface 2 in the circumferential direction.

Next, we will explain the fixing cylinder 20. The fixing cylinder 20 is a metal member with through holes at both ends and an inner circumferential shape that can surround the hydraulically solidified body-buried reinforcing steel rod 1.

Figure 5 shows the fixing cylinder 20 of this embodiment, with (a) being a plan view and (b) being a cross-sectional view. The fixing cylinder 20 has an inner circumferential surface that surrounds the hydraulically solidified body-buried reinforcing steel rod 1. The inner circumferential surface is composed of large-diameter surfaces 22 arranged at positions facing each other across the axis, and engaging protrusions 24 and recesses 26 positioned circumferentially relative to the large-diameter surfaces 22.

The large diameter surface 22 is set so that it is approximately equidistant from the axis and is located radially outward of the ribs 4 when surrounding the hydraulically solidified body-buried reinforcing steel bar 1. In other words, the radius is set so that it has a larger diameter than the ribs 4. Note that the large diameter surface 22 is not limited to being approximately equidistant from the axis, and may be set so that its distance from the axis center varies along the circumferential direction, as long as it is at least not in contact with the ribs 4.

The engaging protrusions 24 protrude circumferentially inward from the large diameter surface 22 and are arranged in multiple rows in the axial direction. Furthermore, the distance from the axial center of the engaging protrusions 24 is set so that, when they surround the hydraulically solidified body-buried reinforcing steel bar 1, they are positioned radially outward from the reduced diameter surface 2.

The recessed portions 26 are depressions that have a concave shape relative to the engaging protrusions 24, and are arranged alternately with the engaging protrusions 24 in the axial direction. The depth of the recessed portions 26 is set so that their bottoms are located at least radially outward from the ribs 4. In other words, the depth of the recessed portions 26 can be set so that they are approximately equidistant from the axis, and they can be connected to the large diameter surface 2 to form an approximately continuous surface. Of course, the depth of the recessed portions 26 can also be set so that they are further from the axis than the large diameter surface 22.

The recessed portion 26 has a shape in which one circumferential end (the left end in Figure 5(b)) forms an open end 28 with a widened width and gradually narrows toward the other end (the right end in Figure 5(b)), the other end being a closed end that restricts circumferential displacement of the rib 4. Here, the closed end is formed by disposing a wall-shaped stopper 29 that protrudes radially from the bottom surface of the recessed portion 26 on the other end side. The radial protruding length of the stopper 29 is set so as to restrict at least circumferential displacement of the rib 4.

The engaging protrusions 24 and recessed portions 26 are arranged in two opposing regions across the axis to correspond to the ribs 4 and recessed surfaces 6 of the hydraulically solidified body-embedded reinforcing steel bar 1, with the engaging protrusions 24 in one region and the engaging protrusions 24 in the other region being set at different axial positions. Figure 6 is a cross-sectional view of the fixing cylinder 20, showing the positional relationship between the engaging protrusions 24 and recessed portions 26 in two opposing regions spaced apart in the radial direction. As shown in Figure 6, for the engaging protrusions 24 in one region located on the left, recessed portions 26 are arranged in the other region located on the right, and for the recessed portions 26 in one region, engaging protrusions 24 are arranged in the other region.

Therefore, by making the engaging protrusions 24 and recessed portions 26 staggered, just like the ribs 4 and recessed surfaces 6 of the hydraulically solidified body-embedded reinforcing steel rod 1, the ribs 4 of the hydraulically solidified body-embedded reinforcing steel rod 1 can fit into each recessed portion 26. Note that if the hydraulically solidified body-embedded reinforcing steel rod 1 has a shape in which the axial positions of the ribs 4 and recessed surfaces 6 are aligned in two opposing regions across the axis, the axial positions of the engaging protrusions 24 and recessed portions 26 are aligned.

Next, the procedure for fitting the hydraulically solidified body-embedded reinforcing steel rod 1 to the fixing cylinder 20 will be described. First, the hydraulically solidified body-embedded reinforcing steel rod 1 is inserted into the through-hole of the fixing cylinder 20. The reduced diameter surface 2 of the hydraulically solidified body-embedded reinforcing steel rod 1 faces the engaging protrusions 24 and recesses 26 of the fixing cylinder 20. The hydraulically solidified body-embedded reinforcing steel rod 1 can be inserted axially without coming into contact with the fixing cylinder 20. In other words, because the reduced diameter surface 2 is located radially inward of the engaging protrusions 24 and the rib 4 is located radially inward of the large diameter surface 22, the hydraulically solidified body-embedded reinforcing steel rod 1 can be inserted without coming into contact with the fixing cylinder 20, allowing it to be displaced axially.

After inserting the hydraulically solidified body-embedded reinforcing steel rod 1, the hydraulically solidified body-embedded reinforcing steel rod 1 is rotated circumferentially relative to the fixing cylinder 20 to fix it to the fixing cylinder 20. Figure 7 shows the rib 4 entering the recessed portion 26, with (a) showing the position before entering the recessed portion 26 and (b) showing the position when fitted into the recessed portion 26. Note that Figure 7 shows the inner peripheral surface of the fixing cylinder 20 from the front, and since surfaces 14a to 14d of the rib 4 face the recessed portion 26, the hydraulically solidified body-embedded reinforcing steel rod 1 (not shown) is positioned on the front side of the page, and the ridge 12 and surfaces 14a to 14d of the rib 4 (not shown) face the recessed portion 26 toward the back of the page.

The hydraulically solidified body-embedded reinforcing steel rod 1 rotates in a predetermined direction so that the rib 4 enters the recessed portion 26 from the open end 28, as shown in Figure 7(a). The hydraulically solidified body-embedded reinforcing steel rod 1 is also rotated relative to the rib 4 until the rib 4 fits into the recessed portion 26 and the leading end of the rib 4 in the direction of travel abuts the closed end of the recessed portion 26, as shown in Figure 7(b).

As a result, the rib 4 fits between the engaging protrusions 24, restricting its axial position, and the rib 4 abuts against the closed end, restricting circumferential displacement of the hydraulically solidified body-embedded reinforcing steel rod 1 in the direction of rotation. Therefore, the hydraulically solidified body-embedded reinforcing steel rod 1 is fixed to the fixing cylinder 20, connecting the hydraulically solidified body-embedded reinforcing steel rod 1 and the fixing cylinder 20.

As explained above, the hydraulically solidified body-embedded reinforcing steel rod 1 can be connected to the fixing cylinder 20 simply by rotating it an appropriate amount, for example, 90°. Of course, the relative rotation angle between the hydraulically solidified body-embedded reinforcing steel rod 1 and the fixing cylinder 20 can be set as desired. Furthermore, because the ribs 4 of the hydraulically solidified body-embedded reinforcing steel rod 1 and the recessed portions 26 of the fixing cylinder 20 are aligned along the axial direction, the fixing cylinder can be easily positioned and fixed to the desired axial position of the hydraulically solidified body-embedded reinforcing steel rod 1.

Furthermore, because the hydraulically solidified body-embedded reinforcing steel rod 1 and the fixing cylinder 20 can be firmly fixed to each other simply by rotating them relative to one another, there is no need to fill the space between the hydraulically solidified body-embedded reinforcing steel rod 1 and the fixing cylinder 20. This eliminates the need to transport, mix, and fill the hardenable filler, shortening work time and improving work efficiency. Furthermore, in conventional fixing methods in which a female-threaded fixing cylinder is fixed to a hydraulically solidified body-embedded reinforcing steel rod 1 that can be threaded with a female-threaded fixing cylinder, the fixing cylinder must be rotated multiple times to thread onto the hydraulically solidified body-embedded reinforcing steel rod 1, which is time-consuming and labor-intensive. However, according to the present invention, the hydraulically solidified body-embedded reinforcing steel rod 1 (or the fixing cylinder 20) can be fixed by simply rotating it axially to the desired axial position.

Furthermore, the ribs 4 of the hydraulically solidified body-embedded reinforcing steel bar 1 are substantially quadrangular pyramid-shaped in the expanded state, with no end faces in the radial direction. As a result, when the hydraulically solidified body-embedded reinforcing steel bar 1 is embedded in the hydraulically solidified body, substantially the entire surfaces 14a to 14d engage with the hydraulically solidified body, improving adhesion to the hydraulically solidified body. Furthermore, when the height of the ribs 4 is constant, the shear cross-sectional area of the hydraulically solidified body between adjacent ribs 4 in the pull-out direction of the hydraulically solidified body-embedded reinforcing steel bar 1 is maximized.
This is because, in conventional reinforcing steel rods for embedding in a hydraulic solidified body, i.e., steel rods for embedding in a hydraulic solidified body including those disclosed in Patent Documents 1 to 3, which have ribs with end faces in the radial direction, the end faces do not contribute at all to the shear resistance in the pull-out direction relative to the hydraulic solidified body, whereas in the reinforcing steel rod 1 for embedding in a hydraulic solidified body of this embodiment, the entire surfaces 14a to 14d contribute to the shear resistance, thereby greatly improving the shear resistance.
Therefore, the hydraulically solidified body-embedded reinforcing steel rod 1 of this embodiment can maximize the pull-out resistance and improve the pull-out strength when it is wholly or partially embedded in a hydraulically solidified body. Of course, when the hydraulically solidified body-embedded reinforcing steel rod 1 is embedded in a hydraulically solidified body, the hydraulically solidified body-embedded reinforcing steel rod 1 can be buried before the hydraulically solidified body solidifies, and then the pull-out resistance can be maximized when the hydraulically solidified body solidifies.

Furthermore, the tip 10 of the rib 4 has a sharpened shape, and the open end 28 of the recessed portion 26 has a widened shape. This prevents the rib 4 from abutting against the engaging protrusion 24, restricting the relative rotation of the hydraulically solidified body-embedded reinforcing steel rod 1 with respect to the fixing cylinder 20, and allows the rib 4 to enter the recessed portion 26 without getting caught. This allows the hydraulically solidified body-embedded reinforcing steel rod 1 to rotate smoothly relative to the fixing cylinder 2.

Furthermore, if the tip 10 of the rib 4 is further sharpened as shown in Figure 4, the rib 4 can be inserted into the recessed portion 26 without getting caught. Furthermore, as long as the engaging protrusion 24 has a surface at its circumferential end, even if the tip 10 is sharpened, the rib 4 and the engaging protrusion 24 may come into contact, potentially restricting the relative rotation of the steel bar 1 for reinforcing a hydraulically solidified body with respect to the fixing cylinder 20. Therefore, as shown in Figure 8(a), it is preferable to further widen the open end 28, i.e., to form a guide shape that is greatly expanded in the axial direction, and to sharpen the circumferential end of the engaging protrusion 24. Furthermore, it is even more preferable to sharpen the circumferential end of the tip 10 and the engaging protrusion 24, as shown in Figure 8(b). This prevents the ends from coming into contact with each other, making it easier for the rib 4 to fit into the recessed portion 26 and facilitating the fitting of the steel bar 1 for reinforcing a hydraulically solidified body with the fixing cylinder 20.

In the above-described embodiment, the hydraulically solidified body-embedded reinforcing steel rod 1 and the fixing cylinder 20 can be fixed together, but it is also possible to easily rotate the hydraulically solidified body-embedded reinforcing steel rod 1 in the opposite direction to the rotation direction when fixing the hydraulically solidified body to the fixing cylinder 20. Therefore, a reverse rotation prevention structure may be provided between the hydraulically solidified body-embedded reinforcing steel rod 1 and the fixing cylinder 20. For example, the reverse rotation prevention structure may be formed by changing the shape of the recessed portion relative to the rib 4. Figure 9 shows another example of the inner peripheral shape of the fixing cylinder 20. For example, the axial length (width) of the recessed portion 30 can be reduced on the open end 32 side, i.e., the open end 32 of the recessed portion 30 can be made narrower than the middle portion to form a reverse rotation prevention structure.

In this case, the width of the open end 32 is set 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 a degree that allows the rib 4 and/or the engaging protrusion 24 to elastically deform and enter the recessed portion 30.

Figure 10 schematically shows the entry of rib 4 into recessed portion 30, with (a) showing the position before entry into recessed portion 30 and (b) showing the position when engaged with recessed portion 30. In Figure 10, the approximate positions of surfaces 14a and 14b located on the far side of the page are indicated by dotted lines and corresponding symbols. As shown in Figure 10(a), surfaces 14a and 14b of rib 4 abut against engaging protrusion 24 on the open end 32 side of recessed portion 30, but by pushing against this resistance, surfaces 14a, 14b and/or engaging protrusion 24 are elastically deformed, allowing rib 4 to enter recessed portion 30 as shown in Figure 10(b).

By fitting the rib 4 into the recessed portion 30 in this way, even if the hydraulically solidified body-embedded reinforcing steel rod 1 rotates in the opposite direction relative to the fixing cylinder 20, an external force sufficient to elastically deform the surfaces 14c, 14d and/or the engaging protrusion 24 must be applied in order for the rib 4 to disengage from the recessed portion 30, thereby forming a reverse rotation prevention structure.

The fixing cylinder 20 may have a reverse rotation prevention structure depending on its external shape. Specifically, as shown in Figure 26, each face of the outer periphery of the hexagonal cross section is spirally twisted in one direction. In such a fixing cylinder 20, the twist direction is set so that when the fixing cylinder 20 is connected to a hydraulically solidified body-buried reinforcing steel rod and embedded in a hydraulically solidified body, and a load is applied in the pull-out direction, a clockwise torque is generated on the fixing cylinder 20. Furthermore, there may be no points on the external shape that are not directly visible when viewed from above. In other words, there may be no so-called under parts.

The reverse rotation prevention structure may also be formed by a separate member from the hydraulically solidified body-embedded reinforcing steel rod 1 and the fixing cylinder 20. For example, when the hydraulically solidified body-embedded reinforcing steel rod 1 is fixed to the fixing cylinder 20, the reduced diameter surface 2 of the hydraulically solidified body-embedded reinforcing steel rod 1 faces the large diameter surface 22 of the fixing cylinder 20, creating a gap between the reduced diameter surface 2 and the large diameter surface 22. Therefore, as shown in Figure 11, the gap between the reduced diameter surface 2 and the large diameter surface 22 may be filled by a rotation prevention member 40 having a perforated plate shape and spacer portions 42 erected around the holes 44 in a direction perpendicular to the plate surface.

Specifically, the hydraulically solidified material-buried reinforcing steel rod 1 is inserted through the hole 44 with the tip of the spacer portion 42 facing the fixing cylinder 20, and the rotation prevention member 40 is brought into contact with or close to the end face of the fixing cylinder 20, inserting the spacer portion 42 between the reduced diameter surface 2 and the large diameter surface 22 to fill the gap. In this way, when the hydraulically solidified material-buried reinforcing steel rod 1 or the fixing cylinder 20 rotates in a direction that retracts the rib 4 from the recessed portion 30, the spacer portion 42 can restrict displacement of the rib 4.

When the rotation prevention member 40 is provided, for example, a female-threaded fixing cylinder may be screwed onto the hydraulically solidified body-buried reinforcing steel rod 1 at a position facing the fixing cylinder 20 across the rotation prevention member 40 to prevent detachment of the spacer portion 42. The spacer portion 42 may be wedge-shaped, with its thickness tapering from the base end to the tip end, or the outer surface of the erected surface may be uneven to improve engagement. In this case, a corresponding uneven shape may be provided on the large-diameter surface of the fixing cylinder 20.
Furthermore, such anti-rotation members can be applied to conventional reinforcing steel rods for buried hydraulic solidified bodies and fixing tubular members, in which an axial gap occurs between the reinforcing steel rods for buried hydraulic solidified bodies and the fixing tubular member when the two are screwed together.

In addition, in the above-described embodiment, the recessed portion 26 has an open end 28 so that the rib 4 can be displaced circumferentially and enter the recessed portion 26. However, the fixing cylinder may be shaped so that the rib 4 fits radially into the recessed portion 26. Figure 12 is a perspective view of another fixing cylinder 50, and Figure 13 shows the fixing cylinder 50, with (a) a plan view and (b) a front view. The fixing cylinder 50 is an internally threaded fixing cylinder with a flange portion 56 at one end. The fixing cylinder 50 also has a hinge portion 52 formed by thinning a portion of the cylindrical wall along the axial direction, and a slit 54 formed in the axial direction at a position radially opposite the hinge portion 52 across the axis.

The flange portion 56 has a notch 57 formed in a location corresponding to the hinge portion 52, and except for the notch 57, has a shape that protrudes radially outward around almost the entire circumference of the fixing cylindrical body 50.

FIG. 14 is a cross-sectional view of the fixing cylinder 50 taken along line D-D in FIG. 13(b), in which the fixing cylinder 50 has a recessed portion 58 on its inner circumferential surface. The recessed portion 58 is formed at a location that is one-quarter of the circumferential phase shifted from the hinge portion 52 and the slit 54. The recessed portion 58 has a shape that is generally elliptical or generally diamond-shaped, with both circumferential ends closed. The recessed portion 58 has a depth that is deepest at the center and gradually becomes shallower along the circumferential direction. That is, the distance from the axis of the fixing cylinder 50 to the recessed portion 58 is greatest at the center and gradually decreases from the center toward the circumferential ends.
The inner peripheral surface of the fixing cylinder 50 around the recessed portion 58 excluding the large diameter surface 22 is an interference surface 60 , and the distance from the axis is set so that it interferes with the rib 4 .

In this type of fixing cylindrical body 50, the cylindrical wall can deform so as to widen the slit 54. That is, for example, when a radially outward force acts on the inner peripheral surface of the fixing cylindrical body 50, the hinge portion 52 bends in a direction that widens the cylindrical wall outward, as shown in Figure 15, and the slit 54 widens so as not to interfere with the bending of the hinge portion 52.

Therefore, when the hydraulically solidified body embedded reinforcing steel rod 1 is inserted into and fixed to the fixing cylinder 50, if the hydraulically solidified body embedded reinforcing steel rod 1 is rotated relative to the fixing cylinder 50, the rib 4 comes into contact with the interference surface 60, creating resistance that prevents rotation. However, the hinge portion 52 elastically deforms, opening the slit 54, expanding the inner space defined by the inner peripheral surface, and displacing the recessed portion 58, interference surface 60, etc., generally radially outward.

This allows further relative rotation of the hydraulically solidified body-embedded reinforcing steel bar 1, allowing the rib 4 to displace circumferentially while sliding against the interference surface 60. When the rib 4 displaces to a position where it overlaps the recessed portion 58, the rib 4 fits into the recessed portion 58. In other words, the size of the expanded inner circumferential space returns to its initial state due to the elasticity of the hinge portion 52, and the recessed portion 58 displaces roughly radially inward relative to the rib 4, allowing the rib 4 to fit into it.

In addition, even when the rib 4 is fitted into the recessed portion 58 of the fixing cylinder 50, the hinge portion 52 can elastically deform, causing the slit 54 to expand. Therefore, an expansion prevention member 64 shown in FIG. 16 may be provided on the fixing cylinder 50 to restrict expansion. The expansion prevention member 64 is a generally plate-shaped member with a through hole 70, and includes a spacer portion 66 arranged around the through hole 70 and a protrusion 68 extending generally parallel to the axis of the through hole 70.

To prevent the slit 54 of the fixing cylinder 50 from expanding using the expansion prevention 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 cutout portion of the flange 56.
17, with the steel rod 1 for reinforcing a hydraulically solidified body to be buried fixed to the fixing cylinder 50, the expansion prevention member 64 is moved toward the fixing cylinder 50 while inserting the steel rod 1 for reinforcing a hydraulically solidified body to be buried through the through-hole 70 with the spacer portion 66 oriented so that it fits between the reduced diameter surface 2 and the large diameter surface 22 and the protrusion portion 68 fits into the notch portion 57 of the flange 56. As shown in FIG. 18, the protrusion portion 68 fits into the notch portion 57, thereby restricting the narrowing of the notch portion 57 when the hinge portion 52 elastically deforms, thereby preventing the slit 54 from expanding.

It is also desirable to form a recess into which the expansion prevention member 64 fits on the end face of the fixing cylindrical body 50 facing the expansion prevention member 64. If the shape of this recess and the outer circumferential shape of the expansion prevention member 64 are the same but non-circular (or the distance from the axis of the fixing cylindrical body 50 or through hole 70 varies along the circumferential direction), relative rotation of the expansion prevention member 64 with respect to the fixing cylindrical body 50 can be prevented.

Although the fixing cylinder 50 has been described as having the shape of an internally threaded fixing cylinder, it is not intended to limit the application of the fixing cylinder 50, and it may be appropriately configured.
Although the hinge portion has been described as being elastically deformable, this is not limited to this, and it may be formed by an opening and closing mechanism such as a hinge, and may be configured to open and close in the approximate circumferential direction of the fixing cylindrical body 50.

Furthermore, although the fixing cylindrical body is configured such that the inner space expands due to elastic deformation of the hinge portion, this is not limited to this. As shown in Figure 19(a), the fixing cylindrical body 50 may be divided circumferentially, and the divided bodies 50a and 50b may be held so as to be displaceable radially by a biasing member.
The fixing cylinder may be divided into three or more parts. The biasing member may be, for example, a ring-shaped coil spring, ring spring, or wire ring wound around the outer periphery of the fixing cylinder 50, or a leaf spring wound around the fixing cylinder 50 in a similar manner.

Also, as shown in Figure 19(b), the biasing member 80 may be a compression spring or the like connected to the opposing surfaces of the segments 50a, 50b so as to connect the segments 50a, 50b together. Alternatively, as shown in Figure 19(c), the cylindrical wall disposed between the opposing surfaces of the segments 50a, 50b may be thinned and bent into a bellows shape or the like to provide spring properties to form the biasing member 80. With these configurations, the segments 50a, 50b are integrated via the biasing member 80, allowing the inner circumferential space to expand circumferentially and/or radially.

The fixing cylinder 50 may also be formed with multiple thin-walled sections whose wall thickness is reduced circumferentially. These thin-walled sections may deform the through-hole by elastically deforming and flexing, allowing the rib 4 to fit into the recessed section 58. Specifically, as shown in FIG. 20 , the fixing cylinder 50 has a through-hole shaped approximately corresponding to the shape of the hydraulically solidified body-buried reinforcing steel rod 1, with an approximately oval outer shape and the large-diameter surface 22 located at the short radius. This forms a thin-walled section 90 at the short radius. The flange 56 may also have slits 92 axially and radially aligned with the thin-walled sections 90. The slits 92 are shaped so as not to impede the thin-walled sections 90 from elastically deforming within a predetermined range. Here, the slit width is wider toward the base end of the flange 56, i.e., the side closer to the thin-walled sections 90, and gradually narrows toward the radial ends. Of course, the width of the cut in the flange 56 can be set as appropriate as long as it does not prevent deformation of the thin-walled portion 90, and may be approximately constant along the radial direction, or may gradually widen along the radial direction.

In this type of fixing cylinder 50, when the hydraulically solidified body-embedded reinforcing steel rod 1 is inserted into the through-hole so that the rib 4 of the hydraulically solidified body-embedded reinforcing steel rod 1 faces the large diameter surface 22, and the hydraulically solidified body-embedded reinforcing steel rod 1 is rotated relative to the through-hole, the rib 4 comes into contact with the interference surface 60, creating resistance that impedes rotation. However, as the thin-walled portion 90 elastically deforms, the inner circumferential space (through-hole) defined by the inner circumferential surface deforms circumferentially and/or radially, displacing the recessed portion 58, interference surface 60, etc., generally radially outward.

Furthermore, the thin-walled portion 90 is formed by giving the fixing cylinder 50 an oval outer shape, but this is not limited to this. For example, the thin-walled portion 90 may be formed by giving the fixing cylinder 50 an approximately perfect circular outer shape and positioning the large diameter surface 22 of the fixing cylinder 50 further outward in the radial direction.

A rotation control mechanism may be provided to control the relative rotation of the fixing cylinder and the hydraulically solidified body-embedded reinforcing steel rod, which engage with each other. Figure 21 shows a rotation control ring 100 as a rotation control mechanism, with (a) being a perspective view, (b) being a plan view, and (c) being a side view. The rotation control ring 100 is a generally annular member with a portion cut off in the circumferential direction, and has a twisted shape so that the axial positions of the circumferential ends 100a, 100b differ. Furthermore, the rotation control ring 100 is formed with a thin portion in the circumferential direction so that it can elastically deform in the circumferential direction. That is, the rotation control ring 100 transitions between an expanded state in which the ends 100a, 100b are circumferentially spaced apart, and a contracted state in which the ends 100a, 100b elastically deform until they come into contact and the outer periphery is closed.

The rotation control ring 100 also has a step 102 formed by a difference in diameter in the radial direction midway along the circumferential direction of its outer peripheral surface, and has a shape with a different outer diameter at the boundary of the step 102. Here, as shown in Figure 21, the outer diameter is set larger in the region from the step 102 to the end 100b than in the region from the step 102 to the end 100a. Therefore, the outer shape of the end 100b protrudes radially outward more than the end 100a.

The inner peripheral surface of the rotation control ring 100 corresponds to the shape of the reinforcing steel rod 1 for embedded in a hydraulically solidified body when viewed in the axial direction, and is shaped to engage circumferentially. That is, the inner peripheral surface is composed of a first inner peripheral surface 104 that faces the reduced diameter surface 2 and may 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 by the reinforcing steel rod 1 for embedded in a hydraulically solidified body, the first inner peripheral surface 104 and the rib cannot face each other. Therefore, the rotation control ring 100 is oriented circumferentially relative to the reinforcing steel rod 1 for embedded in a hydraulically solidified body so that the first inner peripheral surface 104 faces the reduced diameter surface 2 and the second inner peripheral surface 106 faces the rib 4, and they further engage circumferentially.

Figure 22 shows the fixing cylinder 110, with (a) being a plan view and (b) being an A-A cross-sectional view, and Figure 23 being a cross-sectional view showing the interior of the mounting portion 120 as viewed in the axial direction. The fixing cylinder 110 onto which the rotation control ring 100 can be attached will now be described. The fixing cylinder 110 differs from the fixing cylinder 50 in that it has a mounting portion 120 that defines an internal space into which the rotation control ring 100 is fitted and attached. The mounting portion 120 is located at the end opposite 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 Figure 23).

The axial engagement portion 122 is a convex portion extending around almost the entire circumference of the opening end, protruding radially inward to reduce the size of the opening. The opening defined by the axial engagement portion 122 is set to a size that allows at least the hydraulically solidified body-embedded reinforcing steel rod 1 to pass through and restricts the insertion of the rotation control ring 100 in its expanded state. Of course, the axial engagement portion 122 is not limited to extending around the entire circumference, and may be present intermittently in the circumferential direction.

The first circumferential engagement portion 124 is a step 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 clockwise in a plan view, with the first circumferential engagement portion 124 as the boundary. The first circumferential engagement portion 124 can engage with one of the ends of the rotation control ring 100, and in this case, it is assumed to engage with end 100b. The second circumferential engagement portion 126 is a step that protrudes radially inward and is arranged on the circumferential surface of the mounting portion 120, and can engage with step 102 of the rotation control ring 100.

The rotation control ring 100 can be fitted into the mounting portion 120 of the fixing cylinder 110 by being contracted. In other words, the rotation control ring 100 is attached before inserting the hydraulically solidified body-embedded reinforcing steel rod 1 into the fixing cylinder 110. Figure 24 shows the transition of the orientation of the rotation control ring 100 within the fixing cylinder 110. (a) shows the orientation when the hydraulically solidified body-embedded reinforcing steel rod 1 is inserted into the fixing cylinder 110, and (b) shows the orientation when the hydraulically solidified body-embedded reinforcing steel rod 1 and the fixing cylinder 110 are connected. As shown in Figure 24(a), the hydraulically solidified body-embedded reinforcing steel rod 1 is inserted with the rotation control ring 100 installed so that the second inner circumferential surface 106 is aligned radially with the large diameter surface 22.

Next, to connect the reinforcing steel rod 1 for embedded hydraulic solidified material to the fixing cylinder 110, the reinforcing steel rod 1 for embedded hydraulic solidified material is rotated relative to the fixing cylinder 110. As shown in Figure 24(a), the radial end of the end face 100b protrudes to a position where it can engage with the second circumferential engagement portion 126, restricting counterclockwise rotation. In other words, the rotation control ring 100 exhibits a reverse rotation prevention function during insertion, preventing reverse rotation in the specified direction (clockwise) when the reinforcing steel rod 1 for embedded hydraulic solidified material is inserted into the fixing cylinder 110.

When the hydraulically solidified body-embedded reinforcing steel rod 1 is rotated approximately 90° clockwise along the circumferential direction, the rotation control ring 100 rotates within the mounting portion 120. As shown in Figure 24(b), the step portion 102 of the rotation control ring 100 engages with the second circumferential engagement portion 126, restricting further clockwise rotation. Therefore, the rotation control ring 100 exerts a connection rotation angle restriction function by restricting the rotation angle when the hydraulically solidified body-embedded reinforcing steel rod 1 is connected to the fixing cylinder 110 to between 0° and 90° from the initial phase. In other words, the rotation control ring 100 controls the relative phase between the hydraulically solidified body-embedded reinforcing steel rod 1 and the fixing cylinder 110 to between 0° and 90° from the initial phase, and at the 90° phase, prevents further forward rotation while preventing rotation to a phase less than that, i.e., reverse rotation.

Furthermore, end 100b engages with first circumferential engaging portion 124. Figure 25 shows the state before and after engagement of end 100b and first circumferential engaging portion 124, with (a) being a cross-sectional view showing the state before engagement and (b) being a cross-sectional view showing the state after engagement. Note that the hydraulically solidified body buried reinforcing steel rod 1 is omitted from Figure 25. In the initial phase, the rotation control ring 100 is restricted in its axial position within the mounting portion 120, and is held in a state where it is forcibly elastically deformed in the axial direction so that end portions 100a, 100b are aligned at approximately the same axial position, as shown in Figure 25(a).

Then, when the rotation control ring 100 rotates clockwise together with the steel rod 1 for reinforcing a hydraulically solidified body, and rotates 90° from the initial position, the end 100b passes over the first circumferential engagement portion 124. Here, as shown in FIG. 21, the axial position of end 100b is shifted downward relative to end 100a, so it displaces downward along the step of the first circumferential engagement portion 124, as shown in FIG. 25(b). As a result, end 100b engages circumferentially with the first circumferential engagement portion 124. Therefore, when the steel rod 1 for reinforcing a hydraulically solidified body and the fixing cylinder 110 are connected, the rotation control ring 100 exhibits a reverse rotation prevention function during connection, preventing reverse rotation in a specified direction (clockwise).

As mentioned above, the cylindrical portion may have a shape such as an approximately elliptical or diamond shape, with both circumferential ends closed. This means that the shape is symmetrical with respect to at least an axis of symmetry parallel to the axial direction, and includes shapes such as an approximately oval, lip, rugby ball, or egg, and further includes shapes that form closed ends with both circumferential ends closed and have a shape similar or approximate to the shape of the rib when viewed radially.

The fixing cylinder has been described as having an asymmetrical shape with respect to an axis of symmetry parallel to the axial direction, or a symmetrical shape as described above, with the recessed portions having an expanded open end at one circumferential end and gradually narrowing toward the other end, the other end being a closed end that restricts circumferential displacement of the rib, as viewed in the radial direction. However, it is of course also possible to arrange asymmetrical and symmetrical recessed portions in a row in the axial direction. In this case, the arrangement of the recessed portions may be such that asymmetrical and symmetrical recessed portions are alternately arranged, or a hybrid structure may be used in which symmetrical recessed portions are arranged every few recessed portions among multiple asymmetrical shapes, or an appropriate combination arrangement may be used.

1... Hydraulic solidified body buried type reinforcement steel rod 2... Reduced diameter surface 4... Rib 4a... End surface 6... Concave diameter surface 10... Tip 12... Ridge line 14a-14d... Surface 20, 50... Fixing cylinder 22... Large diameter surface 24... Engaging protrusion 26, 30, 58... Concave portion 28, 32... Open end 29... Stopper 40... Rotation prevention member 42... Spacer portion 44... Hole 52... Hinge portion 54... Slit 56... Flange portion 57... Notch portion 60... Interference surface 64... Expansion prevention member 66... Spacer portion 68... Protrusion 70... Through hole 50a, 50b... Divided body 80... Biasing member, 100... Rotation control ring.

Claims (26)

The bearing has a tapered surface that exists in a predetermined region and has a radius from the axis that gradually decreases toward the circumferential center of the region, ribs that are arranged in a row in the axial direction and protrude radially outward, and concave surfaces that are alternately recessed in the ribs in the axial direction,
The rib has a tip portion that forms a line at the end portion that protrudes radially outward , the ridge line drawn by the line extends in a direction perpendicular to the axis, and both ends extend toward the reduced diameter surface. 2. A reinforcing steel rod for embedding in hydraulically solidified bodies according to claim 1, characterized in that the ribs protrude radially outward most at the center and the radial protrusion length gradually decreases toward the circumferential ends. 3. A reinforcing steel rod for embedding in a hydraulically solidified body according to claim 1, wherein the rib has four faces facing in different normal directions. 4. The reinforcing steel rod for embedding in a hydraulically solidified body according to claim 1, wherein the ribs have sharpened ends in the circumferential direction. The steel rod for reinforcing a hydraulically solidified body buried type according to claim 3, characterized in that the tip portion is an approximately triangular pyramid shape having a three-dimensional curved surface at both ends in the circumferential direction, each of which is set smaller than a curved, slender triangular pyramid space area surrounded by imaginary extension planes formed by extending the four faces in the direction of rotation around the axis. the rib and the concave surface are arranged in two regions symmetrical with respect to the axis,
6. A steel rod for reinforcing a hydraulically solidified body buried type according to claim 1, wherein the ribs and the concave surfaces are arranged so that their axial positions are different in the two regions. 7. The steel rod for reinforcing a hydraulically solidified body to be buried according to claim 4 , wherein the rib has a substantially quadrangular pyramid shape when expanded. A fixing cylindrical body having an inner circumferential surface capable of surrounding a hydraulically solidified body buried reinforcing steel rod,
The inner peripheral surface has a large diameter surface that is approximately equidistant from the axis,
engaging protrusions that protrude circumferentially inward from the large diameter surface and are arranged in a row in the axial direction;
and recessed portions that are alternately recessed in the engaging protrusions in the axial direction , the distance from the axis being longest at a central portion and gradually decreasing toward the circumferential ends ,
The fixing cylindrical body is characterized in that the recessed portion can receive the ribs of the hydraulically solidified body buried reinforcing steel rod by allowing them to enter from the circumferential direction and/or the radial direction. The fixing cylindrical body according to claim 8, characterized in that the recessed portion has an open end and a closed end in the circumferential direction, receives the rib from the open end side, and can regulate the circumferential displacement of the rib by the closed end . 10. The fixing cylinder according to claim 9 , wherein the recessed portion has a guide shape with an open end that widens in the axial direction. 11. The fixing cylinder according to claim 9 , wherein the recessed portion has a shape that is contracted in the axial direction toward the closed end. 12. The fixing cylinder according to claim 9 , wherein the recessed portion has a stopper on the closed end side to prevent reverse relative rotation with the hydraulically solidified body buried reinforcing steel rod. 13. The fixing cylinder according to claim 9 , wherein the recessed portion has a width greater at a middle portion than at an open end. 14. The fixing cylinder according to claim 13 , wherein the recessed portion has a generally teardrop shape. It has a hinge portion on the outer periphery,
The recessed portion has a shape in which both ends in a circumferential direction are sharp and a circumferential central portion is widened,
9. The fixing cylindrical body according to claim 8 , wherein the hinge portion causes the outer periphery to bend, thereby expanding the inner periphery space in the circumferential direction and/or the radial direction. 16. The fixing cylinder according to claim 15 , wherein the recessed portion has a substantially elliptical or rhombic shape. 17. The fixing cylinder according to claim 8 , wherein the fixing cylinder is configured by two or more divided bodies that are divided into two or more portions in the circumferential direction. 18. The fixing cylindrical body according to claim 17 , wherein the divided bodies are integrated by a biasing member so that the inner peripheral space can be expanded in the circumferential direction and/or the radial direction. 15. The fixing cylinder according to claim 8 , wherein the outer peripheral surface has a shape that is twisted in one direction in a spiral shape. The thin-walled portion is located on the outer periphery and/or the inner periphery.
The recessed portion has a shape in which both ends in a circumferential direction are sharp and a circumferential central portion is widened,
9. The fixing 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. a mounting portion for mounting a rotation control mechanism therein that can surround the hydraulically solidified body buried reinforcing steel rod;
21. The fixing cylinder according to claim 20, wherein the mounting portion is capable of restricting radial and/or axial displacement of the rotation control mechanism. The fixing cylinder described in claim 21, characterized in that the rotation control mechanism has an inner surface that engages with the hydraulically solidified body-buried reinforcing steel rod and restricts relative rotation with the hydraulically solidified body-buried reinforcing steel rod. the rotation control mechanism includes angle regulating means for regulating a rotation angle of the hydraulically solidified body-buried reinforcing steel rod along a rotation direction when the recessed portion receives the rib, in a state before the recessed portion receives the rib;
a first restricting means for restricting the rotation of the steel rod for reinforcing a hydraulically solidified body in a direction opposite to the rotation direction of the steel rod for reinforcing a hydraulically solidified body when the recessed portion receives the rib;
A fixing cylinder as described in claim 21 or 22, characterized in that it has a second restricting means for restricting the reverse rotation of the hydraulically solidified body - buried reinforcing steel rod after the recessed portion receives the rib. A fixing cylinder as described in any one of claims 21 to 23, characterized in that the rotation control mechanism has a shape with a circumferentially interrupted portion and is elastically deformable in the radial and/or circumferential directions, transitioning between an expanded state in which the circumferential ends are separated from each other, and a contracted state in which the circumferential ends are in contact and closed. A fixing cylindrical body having an inner circumferential surface capable of surrounding a hydraulically solidified body buried reinforcing steel rod,
The inner peripheral surface has a large diameter surface that is approximately equidistant from the axis center,
engaging protrusions that protrude circumferentially inward from the large diameter surface and are arranged in a row in the axial direction;
a recessed portion that is alternately recessed in the engaging protrusion in the axial direction and that can receive the ribs of the hydraulically solidified body buried reinforcing steel bar from the circumferential direction and/or the radial direction;
a hinge portion provided on the outer periphery,
The recessed portion has a shape in which both ends in a circumferential direction are sharp and a circumferential central portion is widened,
The fixing cylindrical body is characterized in that the inner space expands in the circumferential direction and/or the radial direction when the outer periphery is bent by the hinge portion. A fixing cylindrical body having an inner circumferential surface capable of surrounding a hydraulically solidified body buried reinforcing steel rod,
The inner peripheral surface has a large diameter surface that is approximately equidistant from the axis center,
engaging protrusions that protrude circumferentially inward from the large diameter surface and are arranged in a row in the axial direction;
and recessed portions that are alternately recessed in the engaging protrusions in the axial direction and that can receive the ribs of the hydraulically solidified body buried reinforcing steel rod by inserting them from the circumferential direction and/or the radial direction,
The fixing cylindrical body is characterized in that the fixing cylindrical body is constituted by two or more divided bodies that are divided into two or more parts in the circumferential direction.