Hydraulic setting body embedded type reinforcement steel rod and fixing cylindrical body

Abstract

To provide means that can easily position and fix the fixing cylinder at the desired axial position of the hydraulic solidified body embedded type reinforcing steel rod, and that improves the connectivity between the hydraulic solidified body embedded type reinforcing steel rods and improves the pull-out strength of the hydraulic solidified body in the embedded state.SOLUTION: The steel rod includes a diameter-reduced 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, a rib that is arranged in the axial direction and projects outward in the radial direction, and a concave diameter surface that is concave by alternating with the rib in the axial direction. The rib has a tip portion at the 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 reinforcing steel rod for embedding in a hydraulically solidified body and a fixing cylinder. [Background technology]

[0002] 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). As examples of reinforcing steel rods for embedding in hydraulic solidified bodies, those described in Patent Document 2 are used, as well as those having a substantially circular cross section and a large number of parallel longitudinal protrusions arranged in a row on part of the outer surface of the reinforcing steel rod for embedding in hydraulic solidified bodies at substantially equal intervals over the entire axial length of the reinforcing steel rod for embedding in hydraulic solidified bodies (see, for example, Patent Document 3). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-178365 [Patent Document 2] Patent No. 1227542 [Patent Document 3] Japanese Patent Application Publication No. 56-135658 Summary of the Invention [Problem to be solved by the invention]

[0004] The fixing tubular member described in Patent Document 1 mentioned above requires filling the inside of the steel rod accommodating section in which the steel rod is loosely fitted with a hardenable filler, which requires work such as transporting and kneading the hardenable filler at the construction site, resulting in a heavy workload.

[0005] 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 adhesion of the hydraulically solidified bodies when they are embedded. Also, some reinforcing steel rods for embedding hydraulically solidified bodies can be threaded with female threads, but 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.

[0006] The present invention was made in consideration of the above problems through intensive research by the inventors, and aims to provide a means for easily positioning and fixing a fixing cylinder at a desired axial position of a reinforcing steel rod for embedding in a hydraulic solidified body with a simple structure, improving the connectivity between the reinforcing steel rods for embedding in a hydraulic solidified body, and improving the pull-out strength when embedded in the hydraulic solidified body. [Means for solving the problem]

[0007] The present invention In one aspect The steel rod for reinforcing a hydraulically solidified body to be embedded 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, and the ribs are: the above Radial direction outward to stand out End form a line having a tip portion, Depicted by the line The ridgeline the above shaft perpendicular to In the direction Stretch In addition, both ends of the slit extend toward the reduced diameter 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.

[0008] The hydraulically solidified body buried type reinforcing steel rod of the present invention is characterized in that the rib has four faces whose normal directions are different from each other.

[0009] The hydraulically solidified body-buried reinforcing steel rod of the present invention is characterized in that the ribs have sharpened ends in the circumferential direction.

[0010] In addition, the hydraulically solidified body-buried reinforcing steel rod of the present invention is characterized in that the tip portion has an approximately triangular pyramid shape with a three-dimensional curved surface at both circumferential end portions, each of which is set smaller than the curved, slender triangular pyramid space area surrounded by imaginary extension surfaces formed by extending each of the four faces in the direction of rotation around the axis, thereby making it possible, when fitting into a fixing cylinder, to smoothly fit the rib into the recessed portion without it getting caught between the ends of the recessed portions formed on the inner surface of the fixing cylinder.

[0011] Furthermore, the hydraulically solidified body buried reinforcing steel rod of the present invention is characterized in that the ribs and the concave diameter surfaces are arranged in two regions symmetrical with respect to the axis, and in the two regions, the ribs and the concave diameter surfaces are arranged so that their axial positions are different.

[0012] The hydraulically solidified body buried type reinforcing steel rod of the present invention is characterized in that the ribs are in the shape of a substantially square pyramid when deployed.

[0013] The present invention In one aspect The fixing cylinder has an inner peripheral surface capable of surrounding a hydraulically solidified body-buried reinforcing steel rod, and 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 recesses that are alternately formed in the axial direction between the engaging protrusions. The distance from the axis is longest at the center and gradually decreases toward the circumferential ends. and a recessed portion, which is characterized in that the ribs of the hydraulically solidified body buried reinforcing steel rod can enter and receive the ribs from the circumferential direction and / or the radial direction.

[0014] Furthermore, the fixing 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, receives the rib from the open end side, and can regulate the circumferential displacement of the rib by the closed end.

[0015] The fixing cylinder of the present invention is characterized in that the recessed portion has a guide shape with an open end that widens in the axial direction.

[0016] The fixing cylinder of the present invention is characterized in that the recessed portion has a shape contracted in the axial direction toward the closed end.

[0017] The fixing cylinder of the present invention is also characterized in that the recessed portion is provided at its closed end with a stopper for preventing reverse relative rotation with respect to the hydraulically solidified body buried reinforcing steel rod.

[0018] The fixing cylinder of the present invention is characterized in that the recessed portion has a width greater at a middle portion than at an open end.

[0019] 12. The fixing cylinder according to claim 11, wherein the recessed portion has a substantially teardrop shape.

[0020] Furthermore, the fixing cylindrical body of the present invention has a hinge portion on the outer periphery, and the concave portion has a shape in which both circumferential ends are pointed and the circumferential central portion is widened, and the outer periphery is deflected by the hinge portion, thereby expanding the inner space in the circumferential direction and / or radial direction.

[0021] The fixing cylinder of the present invention is characterized in that the recessed portion has a substantially elliptical or rhombic shape.

[0022] The fixing cylindrical body of the present invention is characterized in that it is composed of two or more divided bodies that are divided into two or more parts in the circumferential direction.

[0023] The fixing cylindrical body of the present invention is characterized in that 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.

[0025] The fixing cylinder of the present invention is characterized in that the outer circumferential surface has a shape that is spirally twisted in one direction.

[0026] Furthermore, the fixing cylindrical body of the present invention has a thin-walled portion on the outer periphery and / or inner periphery, and the concave portion has a shape in which both circumferential ends are pointed and the circumferential central portion is widened, and the inner space is deformed in the circumferential direction and / or radial direction by elastic deformation of the thin-walled portion.

[0027] Furthermore, the fixing cylindrical body of the present invention has a mounting portion for mounting a rotation control mechanism inside that can surround the hydraulic solidified body buried reinforcing steel rod, and the mounting portion is characterized in that it can regulate the displacement of the rotation control mechanism along the radial and / or axial directions.

[0028] Furthermore, the fixing cylinder of the present invention is characterized in that the rotation control mechanism has an inner surface that engages with the hydraulically solidified body-buried reinforcing steel rod to regulate relative rotation with the hydraulically solidified body-buried reinforcing steel rod.

[0029] The fixing cylinder of the present invention is further characterized in that the rotation control mechanism comprises an angle regulating means for regulating the rotation angle of the hydraulically solidified body-embedded reinforcing steel rod along the rotation direction when the concave portion receives the rib before the concave portion receives the rib, a first regulating means for regulating the hydraulically solidified body-embedded reinforcing steel rod from rotating in the opposite direction to the rotation direction of the hydraulically solidified body-embedded reinforcing steel rod when the concave portion receives the rib, and a second regulating means for regulating the opposite rotation of the hydraulically solidified body-embedded reinforcing steel rod after the concave portion receives the rib.

[0030] 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 cylinder of the present invention is a fixing cylinder 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, 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 can receive ribs of the hydraulically solidified body-embedded reinforcing steel rod from the circumferential and / or radial directions, and hinge portions provided on the outer periphery, the concave portions having sharpened circumferential ends and a wider circumferential central portion, and the hinge portions deflecting the outer periphery causes the inner peripheral space to expand circumferentially and / or radially. 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, wherein 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 recessed alternately in the axial direction into the engaging protrusions and can receive the ribs of the hydraulically solidified body-embedded reinforcing steel rod from the circumferential and / or radial directions, and wherein the cylindrical body is composed of two or more divided bodies that are divided circumferentially into two or more parts. [Effects of the Invention]

[0031] According to the present invention, the simple structure makes it possible to easily position and fix the fixing cylindrical body at the desired axial position of the hydraulically solidified body-embedded reinforcing steel rod, improve the connectivity between the hydraulically solidified body-embedded reinforcing steel rods, and improve the pull-out strength when embedded in the hydraulically solidified body. [Brief explanation of the drawings]

[0032] [Figure 1] 1A and 1B show a hydraulically solidified body-buried reinforcing steel rod according to this embodiment, in which (a) is a front view and (b) is a cross-sectional view taken along line AA. [Figure 2] 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. [Figure 3] FIG. 2 is a cross-sectional view showing a hydraulically solidified body buried reinforcing steel rod. [Figure 4] 10A to 10C show other examples of rib shapes, where (a) is a side view, (b) is a front view, and (c) is a cross-sectional view. [Figure 5] 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. [Figure 6] FIG. 3 is a cross-sectional view showing a fixing cylinder. [Figure 7] 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. [Figure 8] 10A and 10B are diagrams illustrating examples of the shape of a tip portion. [Figure 9] 10A and 10B are diagrams showing other examples of the inner peripheral shape of the fixing cylindrical body. [Figure 10] 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. [Figure 11] FIG. [Figure 12] FIG. 10 is a perspective view showing another fixing cylindrical body. [Figure 13] 1A and 1B show a fixing cylindrical body, in which FIG. 1A is a plan view and FIG. 1B is a front view. [Figure 14] FIG. 3 is a cross-sectional view showing a fixing cylinder. [Figure 15] 10A and 10B are diagrams illustrating the widening of a slit due to bending of a hinge portion. [Figure 16] FIG. [Figure 17] FIG. 10 is a perspective view showing the orientation of the expansion prevention member relative to the fixing cylinder. [Figure 18] FIG. 10 is a view showing a fixing cylindrical body provided with an expansion prevention member. [Figure 19] FIG. 10 is a view showing a fixing cylindrical body made up of divided bodies. [Figure 20] FIG. 10 is a view showing a fixing cylinder. [Figure 21] 1A, 1B, and 1C show a rotation control ring, in which FIG. 1A is a perspective view, FIG. 1B is a plan view, and FIG. 1C is a side view. [Figure 22] 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. [Figure 23] FIG. 4 is a cross-sectional view showing the inside of the mounting portion as viewed in the axial direction. [Figure 24] This figure shows 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. [Figure 25] 10A and 10B show the state before and after the end and the first circumferential engaging portion are engaged, in which FIG. 10A is a cross-sectional view showing the state before engagement, and FIG. 10B is a cross-sectional view showing the state after engagement. [Figure 26] FIG. 10 is a view showing a fixing cylinder. DETAILED DESCRIPTION OF THE INVENTION

[0033] An embodiment of the fitting structure of the present invention, which is made up of a reinforcing steel rod for buried hydraulic solidified bodies and a fixing cylinder, will be described below with reference to the drawings. The fitting structure is such that the reinforcing steel rod for buried hydraulic solidified bodies is inserted into the inner periphery of the fixing cylinder, and one of the reinforcing steel rod for buried hydraulic solidified bodies and the fixing cylinder is rotated relative to the other to fit and fix them together.

[0034] FIG. 1 shows a steel rod 1 for reinforcing a type of hydraulically solidified body embedded in an embodiment of the present invention, where (a) is a front view and (b) is a cross-sectional view taken along line AA. FIG. 2 shows a rib 4 of the steel rod for reinforcing a type of hydraulically solidified body embedded in an embodiment of the present invention. The steel rod 1 for reinforcing a type of hydraulically solidified body embedded in an hydraulically solidified body is a long steel member that is embedded in the hydraulically solidified body for the purpose of reinforcing the hydraulically solidified body. The steel rod 1 for reinforcing a type of hydraulically solidified body embedded in an hydraulically solidified body 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, ribs 4 arranged in a row in the axial direction and protruding radially outward, and concave diameter surfaces 6 alternately recessed in the ribs 4 in the axial direction.

[0035] The distance from the axis of concave diameter surface 6 is set to be within the range of the distance from the axis of reduced diameter surface 2. For example, the distance from the axis of concave diameter surface 6 can be set to be a distance equivalent to the radius of reduced diameter surface 2 at the circumferential center.

[0036] 2, the rib 4 has a tip 10 at its radial end, with a ridge 12 forming the tip 10 extending in the axis-perpendicular direction and both ends extending toward the reduced diameter surface 2. The rib 4 also has four surfaces 14a to 14d facing in different normal directions.

[0037] The four faces 14a to 14d form a substantially quadrangular pyramid shape when the outer circumferential surface of the hydraulically solidified body embedded 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 called face 14a, the lower left is called face 14b, the upper right is called face 14c, and the lower right is called face 14d.

[0038] Ridges 12, which form the boundaries between surfaces 14a and 14b and between surfaces 14c and 14d, extend in the direction 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-buried reinforcing steel bar 1, i.e., a shape that narrows in width, toward the circumferential end located on the reduced diameter surface 2 side. Therefore, the circumferential end of the rib 4 forms a sharp tip 10.

[0039] The cross-sectional shape of the tip 10 may be substantially acute-angled or substantially obtuse-angled, or may be 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 positioned at the same position as the recessed diameter surfaces 6 in the other region. Also, the ribs 4 in one region are positioned at the same position as 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.

[0040] The rib 4 protrudes radially outward most at the center, and the radial protrusion length gradually decreases toward the circumferential end. That is, the ridge line 12 of the rib 4 is located inside an imaginary circle C whose radius is from the axis of the steel bar 1 for buried in a hydraulically solidified body to the point where the protrusion length of the rib 4 is at its longest, as shown in Figure 1(b). The circumferential end of the rib 4 is connected to the reduced diameter surface 2, and has an end surface 4a that is approximately flush with the reduced diameter surface 2.

[0041] 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).

[0042] 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 BB in (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 at the circumferential end, the ridge line 12 is set to the curve 13a or straight line 13b as described above and connected to the reduced diameter surface 2.

[0043] The tip end of the rib 4 may have a generally triangular pyramidal shape with a three-dimensionally curved surface that is smaller than the curved, slender triangular pyramidal spatial region surrounded by imaginary extension planes formed by extending the four faces 14a to 14d in the rotational direction about the axis. That is, the two circumferential end portions of the rib 4 may have a three-dimensionally curved surface whose protruding length in the direction perpendicular to the axis gradually decreases so as to be located radially inward of the faces 14a to 14d. This three-dimensionally curved surface may have a generally triangular pyramidal shape, but it may also have a curved surface. The rib 4 may also have a shape such that both end portions 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.

[0044] Next, a description will be given of the fixing cylinder 20. The fixing cylinder 20 is a metal member having through holes at both ends and an inner peripheral shape capable of surrounding the hydraulically solidified body buried type reinforcing steel rod 1.

[0045] 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, and the inner circumferential surface is configured with 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 surface 22.

[0046] The large diameter surfaces 22 are set so as to be approximately equidistant from the axis and to be located radially outward of the ribs 4 when surrounding the steel bar 1 for reinforcing a hydraulically solidified body to be buried therein. In other words, the radius is set so as to have a larger diameter than the ribs 4. Note that the large diameter surfaces 22 are not limited to being approximately equidistant from the axis, and may be set so that the distance from the axis varies along the circumferential direction as long as they are not in contact with at least the ribs 4.

[0047] The engaging protrusions 24 protrude circumferentially inward from the large diameter surface 22 and are arranged in a plurality of rows in the axial direction. The distance from the axis of the engaging protrusions 24 is set so that they are positioned radially outward from the reduced diameter surface 2 when surrounding the hydraulically solidified body-buried reinforcing steel bar 1.

[0048] The recessed portions 26 are depressions having a recessed 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 of the ribs 4. That is, 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 may also be set so that they are further away from the axis than the large diameter surface 22.

[0049] The recessed portion 26 has one circumferential end (the left end in FIG. 5(b)) that forms an open end 28 with a widened width, and the other end (the right end in FIG. 5(b)) has a shape that gradually narrows in width, with 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.

[0050] The engaging protrusions 24 and recessed portions 26 are arranged in two opposing regions across the axis so as to correspond to the ribs 4 and the recessed diameter surfaces 6 of the steel bar 1 for reinforcing a hydraulically solidified body, and the engaging protrusions 24 in one region and the engaging protrusions 24 in the other region are set so that their axial positions are staggered. Here, Fig. 6 is a cross-sectional view showing the fixing cylinder 20, illustrating 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 Fig. 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.

[0051] Therefore, by making the engaging protrusions 24 and the recessed portions 26 staggered, like the ribs 4 and the recessed surfaces 6 of the steel bar 1 for reinforcing a hydraulically solidified body to be embedded, the ribs 4 of the steel bar 1 for reinforcing a hydraulically solidified body to be embedded can fit into each recessed portion 26. Note that when the steel bar 1 for reinforcing a hydraulically solidified body to be embedded has a shape in which the axial positions of the ribs 4 and the recessed surfaces 6 are aligned in two regions facing each other across the axis, the axial positions of the engaging protrusions 24 and the recessed portions 26 are aligned.

[0052] Next, a procedure for fitting the steel rod 1 for reinforcing a hydraulically solidified body to be buried into the fixing cylinder 20 will be described. First, the steel rod 1 for reinforcing a hydraulically solidified body to be buried is inserted into the through-hole of the fixing cylinder 20. At this time, the reduced diameter surface 2 of the steel rod 1 for reinforcing a hydraulically solidified body to be buried is positioned opposite the engaging protrusions 24 and the recesses 26 of the fixing cylinder 20. At this time, the steel rod 1 for reinforcing a hydraulically solidified body to be buried can be inserted axially without coming into contact with the fixing cylinder 20. That is, 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 steel rod 1 for reinforcing a hydraulically solidified body to be buried can be inserted without coming into contact with the fixing cylinder 20 and can be displaced in the axial direction.

[0053] After inserting the steel rod 1 for reinforcing a type of hydraulically solidified body to be buried, the steel rod 1 for reinforcing a type of hydraulically solidified body to be buried is rotated circumferentially relative to the fixing cylinder 20 to be fixed to the fixing cylinder 20. Here, Fig. 7 shows a schematic diagram of the entry of the rib 4 into the recessed portion 26, with (a) showing the position before entry into the recessed portion 26 and (b) showing the position when fitted into the recessed portion 26. Note that Fig. 7 shows the inner peripheral surface of the fixing cylinder 20 from the front side, and since the surfaces 14a to 14d of the rib 4 face the recessed portion 26, the steel rod 1 for reinforcing a type of hydraulically solidified body to be buried (not shown) is positioned on the front side of the page, and the ridge line 12 and surfaces 14a to 14d of the rib 4 (not shown) face the recessed portion 26 toward the back side of the page.

[0054] The hydraulically solidified body-embedded reinforcing steel bar 1 rotates in a predetermined direction so that the rib 4 enters the recessed portion 26 from the open end 28, as shown in Fig. 7(a). The hydraulically solidified body-embedded reinforcing steel bar 1 is also rotated to a position shown in Fig. 7(b) where the rib 4 fits into the recessed portion 26 and the leading end of the rib 4 in the advancing direction abuts against the closed end of the recessed portion 26.

[0055] As a result, the rib 4 fits between the engaging protrusions 24, restricting its axial position, and furthermore, the rib 4 abuts against the closed end, restricting circumferential displacement along the direction of rotation of the hydraulically solidified body-embedded reinforcing steel bar 1. Therefore, the hydraulically solidified body-embedded reinforcing steel bar 1 is fixed to the fixing cylinder 20, and the hydraulically solidified body-embedded reinforcing steel bar 1 and the fixing cylinder 20 are connected together.

[0056] As explained above, the reinforcing steel rod 1 for embedding in a hydraulically solidified body can be connected to the fixing cylinder 20 simply by rotating it an appropriate amount, for example, by 90°. Of course, the relative rotation angle between the reinforcing steel rod 1 for embedding in a hydraulically solidified body and the fixing cylinder 20 can be set as appropriate. Furthermore, since the ribs 4 of the reinforcing steel rod 1 for embedding in a hydraulically solidified body and the recessed portions 26 of the fixing cylinder 20 are arranged in a row along the axial direction, the fixing cylinder can be easily positioned and fixed to a desired axial position of the reinforcing steel rod 1 for embedding in a hydraulically solidified body.

[0057] Furthermore, since 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 each other, there is no need to fill a hardenable filler between them, which eliminates the need to transport, mix, and fill the hardenable filler, shortening work time and improving work efficiency. Furthermore, in the conventional fixing method in which an internally threaded fixing cylinder is fixed to a hydraulically solidified body-embedded reinforcing steel rod 1 that can be threaded with an internally threaded fixing cylinder, the fixing cylinder must be rotated many 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 at a small angle after axially moving it to the desired axial position.

[0058] Furthermore, the ribs 4 of the steel bar 1 for reinforcing a hydraulically solidified body embedded in a hydraulically solidified body have a generally quadrangular pyramid shape in an expanded state, with no end faces in the radial direction. As a result, when the steel bar 1 for reinforcing a hydraulically solidified body embedded in a hydraulically solidified body 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 present between adjacent ribs 4 in the pulling direction of the steel bar 1 for reinforcing a hydraulically solidified body embedded in a hydraulically solidified body is maximized. This is because in conventional reinforcing steel rods for embedding in hydraulic solidified bodies, i.e., steel rods for embedding in hydraulic solidified bodies 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 hydraulic solidified bodies 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.

[0059] Furthermore, since the tip 10 of the rib 4 has a pointed shape and the open end 28 of the recessed portion 26 has a widened shape, the rib 4 abutting against the engaging protrusion 24 prevents the relative rotation of the hydraulically solidified body-embedded reinforcing steel bar 1 with respect to the fixing cylinder 20 from being restricted, and the rib 4 can enter the recessed portion 26 without getting caught. Therefore, the hydraulically solidified body-embedded reinforcing steel bar 1 can be smoothly rotated relative to the fixing cylinder 2.

[0060] Furthermore, if the tip 10 of the rib 4 is further sharpened as shown in FIG. 4 , the rib 4 can be inserted into the recessed portion 26 more smoothly. Furthermore, even if the tip 10 is sharpened, as long as the engaging protrusion 24 has a surface at its circumferential end, the rib 4 and the engaging protrusion 24 may come into contact with each other, potentially restricting the relative rotation of the steel bar 1 for reinforcing a hydraulically solidified body embedded in the fixing cylinder 20. Therefore, as shown in FIG. 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, as shown in FIG. 8( b), it is more preferable to sharpen the circumferential end of the tip 10 and the engaging protrusion 24. This prevents the ends from contacting 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 embedded in the fixing cylinder 20.

[0061] In the above-described embodiment, the steel rod 1 for reinforcing a hydraulically solidified body embedded in the fixing cylinder 20 can be fixed to the fixing cylinder 20. However, the steel rod 1 for reinforcing a hydraulically solidified body embedded in the fixing cylinder 20 can be easily rotated in the direction opposite to the direction of rotation when fixed to the fixing cylinder 20. Therefore, a reverse rotation prevention structure may be provided between the steel rod 1 for reinforcing a hydraulically solidified body embedded in 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. Here, FIG. 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 the reverse rotation prevention structure.

[0062] In this case, the width of the open end 32 is set smaller than the maximum width (width of the circumferential center portion) of the rib 4. The difference between the width of the open end 32 and the maximum width of the rib 4 is set to an extent that allows the rib 4 and / or the engaging protrusion 24 to elastically deform and the rib 4 to enter the recessed portion 30.

[0063] 10A and 10B are schematic diagrams showing the rib 4 entering the recessed portion 30, with (a) showing the position before entering the recessed portion 30 and (b) showing the position when fitted into the recessed portion 30. In FIG. 10, the approximate positions of the surfaces 14a and 14b located on the far side of the page are indicated by dotted lines and corresponding symbols. As shown in FIG. 10A, the surfaces 14a and 14b of the rib 4 abut against the engaging protrusion 24 on the open end 32 side of the recessed portion 30, but by pushing against this resistance, the surfaces 14a and 14b and / or the engaging protrusion 24 are elastically deformed, and the rib 4 enters the recessed portion 30 as shown in FIG. 10B.

[0064] By fitting the rib 4 into the recessed portion 30 in this manner, even if the hydraulically solidified body-buried 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 come out of the recessed portion 30, resulting in the formation of a reverse rotation prevention structure.

[0065] The fixing cylinder 20 may have a reverse rotation prevention structure depending on its external shape. Specifically, as shown in FIG. 26, each face of the outer periphery of the hexagonal cross section may be 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 or the like and receives a load in the pull-out direction, a clockwise torque is generated in the fixing cylinder 20. Furthermore, it is also possible to have no points on the external shape that are not directly visible in a plan view. In other words, it is also possible to have no so-called under parts.

[0066] The reverse rotation prevention structure may also be formed by a member separate from the steel rod 1 for reinforcing a hydraulically solidified body to be buried and the fixing cylinder 20. For example, when the steel rod 1 for reinforcing a hydraulically solidified body to be buried is fixed to the fixing cylinder 20, the reduced diameter surface 2 of the steel rod 1 for reinforcing a hydraulically solidified body to be buried 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, 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 including spacer portions 42 erected around the holes 44 in a direction perpendicular to the plate surface, as shown in Figure 11.

[0067] Specifically, the hydraulically solidified material-buried reinforcing steel rod 1 is inserted into 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.

[0068] When the anti-rotation 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 anti-rotation member 40 to prevent the spacer portion 42 from coming off. 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.

[0069] 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 configured so that the rib 4 fits radially into the recessed portion 26. FIG. 12 is a perspective view of another fixing cylinder 50, and FIG. 13 shows the fixing cylinder 50, with (a) being a plan view and (b) being a front view. The fixing cylinder 50 is an internally threaded fixing cylinder having a flange 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.

[0070] The flange portion 56 has a notch 57 formed at 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.

[0071] FIG. 14 is a cross-sectional view of the fixing cylinder 50 taken along line DD 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 diamond-shaped, with both circumferential ends closed. The depth of the recessed portion 58 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 center of the recessed portion 58 is longest 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 .

[0072] In such a fixing cylinder 50, the cylinder wall can be deformed so as to widen the slits 54. That is, for example, when a radially outward force acts on the inner peripheral surface of the fixing cylinder 50, the hinge portion 52 bends in a direction that widens the cylinder wall outward as shown in FIG.

[0073] Therefore, when the hydraulically solidified body buried reinforcing steel rod 1 is inserted into the fixing cylinder 50 and fixed, if the hydraulically solidified body buried 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 the rotation, but the slit 54 opens due to elastic deformation of the hinge portion 52, and the inner space defined by the inner surface expands, causing the concave portion 58, interference surface 60, etc. to be displaced approximately radially outward.

[0074] This allows further relative rotation of the hydraulically solidified body buried reinforcing steel bar 1, and the rib 4 can be displaced in the circumferential direction while sliding against the interference surface 60. When the rib 4 is displaced 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.

[0075] In addition, in the fixing cylinder 50 having the hinge portion 52, even when the rib 4 is fitted into the recessed portion 58, the hinge portion 52 can elastically deform, and the slit 54 can 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 substantially plate-shaped member provided with a through hole 70, and includes a spacer portion 66 arranged around the through hole 70 and a protrusion portion 68 extending substantially parallel to the axis of the through hole 70.

[0076] 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. That is, with the steel rod 1 for reinforcing a hydraulically solidified body to be buried fixed to the fixing cylinder 50 as shown in Fig. 17, 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 width of the notch portion 57 from narrowing when the hinge portion 52 elastically deforms, thereby preventing the slit 54 from expanding.

[0077] Furthermore, it is 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, and if the shape of this recess and the outer peripheral shape of the expansion prevention member 64 are the same shape but non-circular (or have shapes in which the distance from the axis of the fixing cylindrical body 50 or the 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.

[0078] 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, and may be appropriately set. 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.

[0079] 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, and the fixing cylindrical body 50 may be divided circumferentially as shown in Figure 19(a), and the divided bodies 50a and 50b may be held radially displaceable 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.

[0080] 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 FIG. 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 so that the inner circumferential space can expand in the circumferential and / or radial directions.

[0081] The fixing cylinder 50 may also be formed with a plurality of thin-walled portions whose wall thickness is reduced in the circumferential direction, and these thin-walled portions may elastically deform and flex to deform the through-hole, allowing the rib 4 to fit into the recessed portion 58. Specifically, as shown in FIG. 20 , the fixing cylinder 50 has a through-hole with a shape that roughly corresponds to the shape of the steel bar 1 for buried hydraulically solidified body reinforcing, with an outer shape that is roughly oval and the large-diameter surface 22 located at the short radius. This forms a thin-walled portion 90 at the short radius. The flange 56 may also have slits 92 that are parallel to the thin-walled portions 90 in the axial and radial directions. The shape of the slits 92 is such that it does not interfere with the elastic deformation of the thin-walled portions 90 within a predetermined range. Here, the slits 92 are configured so that the slit width is wider toward the base end of the flange 56, i.e., the side closer to the thin-walled portions 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 hinder the deformation of the thin-walled portion 90, and it may be approximately constant along the radial direction, or it may gradually widen along the radial direction.

[0082] In such a fixing cylindrical body 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 insert, the rib 4 comes into contact with the interference surface 60, creating resistance that hinders rotation, but the thin-walled portion 90 elastically deforms, causing the inner space (through hole) defined by the inner surface to deform circumferentially and / or radially, displacing the concave portion 58, the interference surface 60, etc., approximately radially outward.

[0083] Furthermore, the thin-walled portion 90 is formed by making the outer shape of the fixing cylindrical body 50 elliptical, but this is not limited to this. For example, the thin-walled portion 90 may be formed by making the outer shape of the fixing cylindrical body 50 approximately circular and setting the position of the large diameter surface 22 of the fixing cylindrical body 50 further radially outward.

[0084] A rotation control mechanism may be provided to control the relative rotation of the fixing cylinder and the steel rod for reinforcing a hydraulically solidified body. Figure 21 shows a rotation control ring 100 as a rotation control mechanism, with (a) a perspective view, (b) a plan view, and (c) a side view. The rotation control ring 100 is a generally annular member with a circumferentially cut portion and a twisted shape such that the axial positions of the circumferential ends 100a, 100b are different. The rotation control ring 100 is also formed with a thin wall portion along its circumference to allow elastic deformation along 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 circumferential surface is closed.

[0085] 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 different outer diameters at the boundary of the step 102. Here, as shown in Fig. 21, the outer diameter of the region from the step 102 to the end 100b is set larger than that of 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.

[0086] The inner peripheral surface of the rotation control ring 100 corresponds to the shape of the steel rod 1 for buried in a hydraulically solidified body reinforcing rod 1 when viewed in the axial direction, and is shaped to engage circumferentially. That is, the inner peripheral surface is configured with a first inner peripheral surface 104 that faces the reduced diameter surface 2 and can interfere with the ribs 4, and a second inner peripheral surface 106 that faces the ribs 4 and has a larger diameter than the first inner peripheral surface 104. Therefore, when the rotation control ring 100 is surrounded by the steel rod 1 for buried in a hydraulically solidified body reinforcing rod 1, the first inner peripheral surface 104 and the ribs do not face each other. Therefore, the rotation control ring 100 is oriented circumferentially relative to the steel rod 1 for buried in a hydraulically solidified body reinforcing rod 1 so that the first inner peripheral surface 104 faces the reduced diameter surface 2 and the second inner peripheral surface 106 faces the ribs 4, and the rotation control ring 100 further engages circumferentially.

[0087] Fig. 22 shows the fixing cylinder 110, with (a) being a plan view and (b) being an AA cross-sectional view, and Fig. 23 being a cross-sectional view showing the inside of the mounting portion 120 as viewed in the axial direction. The fixing cylinder 110 to which the rotation control ring 100 can be attached will be described. The fixing cylinder 110 differs from the fixing cylinder 50 in that it has a mounting portion 120 that forms 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 Fig. 23).

[0088] The axial engagement portion 122 is a convex portion extending around almost the entire circumference of the opening end, and protrudes 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 expanded rotation control ring 100. Of course, the axial engagement portion 122 is not limited to extending over the entire circumference, and may be present intermittently in the circumferential direction.

[0089] 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 is arranged on the circumferential surface of the mounting portion 120 and protrudes radially inward, and can engage with step 102 of the rotation control ring 100.

[0090] 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. FIG. 24 shows the transition of the orientation of the rotation control ring 100 within the fixing cylinder 110, where (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 FIG. 24(a), the rotation control ring 100 is installed so that the second inner circumferential surface 106 is aligned radially with the large diameter surface 22, and the steel rod 1 is inserted.

[0091] Next, to connect the reinforcing steel rod 1 for embedding in a hydraulically solidified body to the fixing cylinder 110, the reinforcing steel rod 1 for embedding in a hydraulically solidified body is rotated relative to the fixing cylinder 110, but 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 engaging portion 126, thereby restricting counterclockwise rotation. In other words, the rotation control ring 100 exhibits a reverse rotation prevention function during insertion that prevents reverse rotation in a predetermined direction (clockwise) when the reinforcing steel rod 1 for embedding in a hydraulically solidified body is inserted into the fixing cylinder 110.

[0092] When the hydraulically solidified body-embedded reinforcement steel rod 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 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 of the hydraulically solidified body-embedded reinforcement steel rod 1 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 reinforcement steel rod 1 and the fixing cylinder 110 from the initial phase between 0° and 90°, and at the 90° phase, it prevents further forward rotation while preventing rotation to a phase less than that, i.e., reverse rotation.

[0093] Further, the end 100b engages with the first circumferential engaging portion 124. Figure 25 shows the state before and after the end 100b and the first circumferential engaging portion 124 engage, 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 bar 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 the end portions 100a, 100b are parallel to each other at approximately the same axial position, as shown in Figure 25(a).

[0094] Then, when the rotation control ring 100 rotates clockwise together with the steel rod 1 for reinforcement to be embedded in 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 end 100b is axially displaced downward relative to the end 100a, and therefore is displaced downward along the step of the first circumferential engagement portion 124, as shown in FIG. 25(b). As a result, the end 100b engages with the first circumferential engagement portion 124 in the circumferential direction. Therefore, when the steel rod 1 for reinforcement to be embedded in a hydraulically solidified body and the fixing cylinder 110 are connected, the rotation control ring 100 exhibits a reverse rotation prevention function during connection, which prevents reverse rotation in a predetermined direction (clockwise).

[0095] 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 cylindrical portion has a shape that is symmetrical with respect to at least an axis of symmetry parallel to the axial direction, and includes a shape such as an approximately oval shape, an approximately lip shape, an approximately rugby ball shape, an approximately egg shape, 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 in the radial direction.

[0096] The fixing cylinder has been described as having an asymmetric shape or a symmetric shape as described above with respect to an axis of symmetry parallel to the axial direction, in which the recessed portions have an open end that widens at one circumferential direction and a closed end that restricts the circumferential displacement of the rib, as viewed in the radial direction. However, it is also possible to arrange asymmetric and symmetric recessed portions in a row in the axial direction. In this case, the arrangement of the recessed portions may be such that asymmetric 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 a plurality of asymmetrical recessed portions, for example. [Explanation of symbols]

[0097] 1...steel rod for reinforcing hydraulic solidified bodies to be buried 2...reduced diameter surface 4...rib 4a...end surface 6...concave diameter surface 10...tip portion 12...ridge line 14a-14d...surface 20, 50...fixing cylindrical body 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...urging member, 100...rotation control ring.

Claims

1. 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 steel rod for reinforcing a hydraulically solidified body buried as described in 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. 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. 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.

5. 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.

6. 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. 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.

8. 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.

9. 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. 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. 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. 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. 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. 14. The fixing cylinder according to claim 13, wherein the recessed portion has a generally teardrop shape.

15. 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. 16. The fixing cylinder according to claim 15, wherein the recessed portion has a substantially elliptical or rhombic shape.

17. 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. 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.

19. 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.

20. 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.

21. 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.

22. The fixing cylinder according to claim 21, characterized in that the rotation control mechanism has an inner surface that engages with the hydraulically solidified body-buried reinforcing steel rod to regulate relative rotation with the hydraulically solidified body-buried reinforcing steel rod.

23. 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.

24. 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 portion of the circumference interrupted and is elastically deformable in the radial and / or circumferential directions, so that it can transition between an expanded state in which the circumferential ends are separated from each other, and a contracted state in which the ends are in contact with each other and closed.

25. A fixing cylindrical body having an inner peripheral surface capable of surrounding a hydraulically solidified body buried type 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.

26. A fixing cylindrical body having an inner peripheral surface capable of surrounding a hydraulically solidified body buried type 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.

Images