Hydraulic hardened body embedded reinforcement steel rod support structure

Abstract

To provide means that can easily position and securely fix a hydraulic solid body embedded type reinforcement steel bar joint structure to a desired axial direction position of the hydraulic solid body embedded type reinforcement steel bar and is made to improve connectivity between hydraulic solid body embedded type reinforcement steel bars and improve drawing strength and push-in strength.SOLUTION: A hydraulic solid body embedded type reinforcement steel bar joint structure 20 has an insertion hole that can insert a hydraulic solid body embedded type reinforcement steel bar along the axial direction and connects the hydraulic solid body embedded type reinforcement steel bar by engaging an inner periphery with hydraulic solid body embedded type reinforcement steel bar ribs. The inner periphery comprises: engaging protrusions 24 that are arranged along the axial direction and may be engaged with the ribs; at least one kind of concave parts 26 that alternate to the engaging protrusions towards the axial direction and are recessed so as to be able to fit the ribs; and large diameter surfaces 22 that are adjacent to the engaging protrusions and the concave parts in a circumferential direction and do not engage with the ribs. The hydraulic solid body embedded type reinforcement steel bar joint structure restricts the axial direction displacement of the hydraulic solid body embedded type reinforcement steel bar by fitting the ribs to the concave parts.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a hydraulically solidified body buried type reinforcing steel bar joint structure. [Background technology]

[0002] Conventionally, when constructing a structure made of hydraulically solidified bodies, it has been necessary to use long reinforcing steel rods to be embedded in the hydraulically solidified bodies, but the length of the reinforcing steel rods is limited due to transportation restrictions, etc., so they have been joined on-site to achieve longer lengths. Joints are used to join reinforcing steel rods, and the reinforcing steel rods are connected by inserting them into openings on both ends of the joint (see, for example, Patent Document 1). An example of a reinforcing steel rod for embedding in a hydraulically solidified body is disclosed in Patent Document 2, which has a substantially circular cross section and a large number of parallel longitudinal ridges arranged in a row at substantially equal intervals along the entire axial length of the reinforcing steel rod for embedding in a hydraulically solidified body on part of the outer surface thereof. [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 joint described in Patent Document 1 requires the filling of a hardenable filler into the steel rod receiving portion, which loosely fits the steel rod. This requires the construction site to transport and mix the hardenable filler, resulting in a significant workload. Furthermore, the hardenable filler is filled through an injection hole located in the longitudinal center of the joint while the steel rod is loosely fitted in the steel rod receiving portion. However, during filling, the hardenable filler leaks from the openings at both ends of the joint's length, preventing the joint from being fully filled. Therefore, nuts must be tightened on both ends of the joint to close the openings. These issues result in a number of problems, including an increase in the number of required parts and labor, as well as the time required to align the axes of the steel rods inserted into the joint.

[0005] Furthermore, the steel rods for reinforcing buried hydraulic solidified bodies, such as those described in Patent Document 2 and Patent Document 3, are said to have problems with adhesion of the hydraulic solidified bodies when buried.

[0006]

[0007] The present invention was made in consideration of the above-mentioned problems and was made through extensive research by the inventors, and aims to provide a means for easily positioning and fixing a joint structure for a reinforcing steel rod for embedded in a hydraulic solidified body at a desired axial position of the reinforcing steel rod for embedded in a hydraulic solidified body with a simple structure, improving the connectivity between the reinforcing steel rods for embedded in a hydraulic solidified body, and improving the pull-out strength when embedded in the hydraulic solidified body. [Means for solving the problem]

[0008] 1. A steel rod for reinforcing a hydraulically solidified body buried therein according to one embodiment of the present invention. Joints The structure has an insertion hole through which a reinforcing steel rod for a hydraulically solidified body buried type can be inserted along the axial direction, and the inner periphery is engaged with the rib of the reinforcing steel rod for a hydraulically solidified body buried type to connect the reinforcing steel rod for a hydraulically solidified body buried type. JointsThe structure has on the inner circumference engaging protrusions arranged in a row in the axial direction and capable of engaging with the ribs, at least one type of non-helical concave portions alternate with the engaging protrusions in the axial direction and recessed so that the ribs can be fitted therein, and large diameter surfaces circumferentially adjacent to the engaging protrusions and the concave portions and not engaging with the ribs, wherein the non-helical shapes of the concave portions form symmetrical and asymmetrical shapes with the axial direction as the axis of symmetry when viewed in the radial direction, and are arranged in a row in the axial direction, forming a hybrid structure in which the symmetrical shapes and the asymmetrical shapes are arranged, and the ribs are fitted into the concave portions to restrict axial displacement of the hydraulically solidified body-buried reinforcing steel rod. Another embodiment of the steel rod for reinforcing a hydraulically solidified body buried therein according to the present invention Joints The structure has an insertion hole through which a reinforcing steel rod for a hydraulically solidified body buried type can be inserted along the axial direction, and the inner periphery is engaged with the rib of the reinforcing steel rod for a hydraulically solidified body buried type to connect the reinforcing steel rod for a hydraulically solidified body buried type. Joints The structure has on the inner circumference engaging protrusions arranged in a row in the axial direction and capable of engaging with the ribs, at least one type of recessed portion alternately arranged with the engaging protrusions in the axial direction and recessed so that the ribs can be fitted therein, and large diameter surfaces adjacent to the engaging protrusions and recessed portions in the circumferential direction and not engaging with the ribs, and the insertion hole has a hole shape that is approximately oval or approximately elliptical when viewed in the axial direction, and the ribs are fitted into the recessed portions to regulate axial displacement of the hydraulic solidified body buried reinforcing steel rod.

[0011] Furthermore, the hydraulically solidified body-embedded reinforcing steel rod joint structure of the present invention is characterized in that the symmetrical shape has closed ends at both circumferential ends, the main body of the hydraulically solidified body-embedded reinforcing steel rod joint structure has an expansion section that allows the internal space to be expanded, and the expansion section is capable of transitioning between a state in which the rib is received on the inner circumference and a state in which the insertion hole is expanded to receive the rib on the inner circumference.

[0012] The hydraulically solidified body buried type reinforcing steel bar joint structure of the present invention is characterized in that the expansion portion has an elastic deformation mechanism and / or a radial separation mechanism.

[0013] Furthermore, the hydraulically solidified body buried type reinforcing steel rod joint structure of the present invention is characterized in that the asymmetrically shaped concave portion has an open end at one circumferential end, and can receive the rib from the open end side.

[0014] In addition, the hydraulically solidified body buried type reinforcing steel rod joint structure of the present invention is characterized in that the other circumferential end of the asymmetrically shaped concave portion is a closed end, and the closed end can regulate the circumferential displacement of the rib.

[0015] Furthermore, the hydraulically solidified body buried type reinforcing steel rod joint structure of the present invention is characterized in that the concave portion has a spiral shape, and the radial end of the engaging convex portion has a planar, convex curved or acute angled shape.

[0016] Furthermore, the hydraulically solidified body buried type reinforcing steel bar joint structure of the present invention is characterized in that the spiral-shaped concave portion is formed continuously or intermittently along a virtually set spiral path.

[0017] Furthermore, the hydraulically solidified body buried type reinforcing steel rod joint structure of the present invention is characterized in that the spiral-shaped concave portion is formed continuously and the width of the concave portion narrows gradually or in stages from one end in the axial direction to the middle portion.

[0018] Furthermore, the hydraulically solidified body embedded type reinforcement steel rod joint structure of the present invention is characterized in that the insertion hole has a hole shape, when viewed in the axial direction, that is approximately similar or approximate to the outer shape, when viewed in the axial direction, of the hydraulically solidified body embedded type reinforcement steel rod.

[0020] In addition, the hydraulically solidified body buried type reinforcing steel rod joint structure of the present invention is characterized in that the insertion hole has a two-sided width portion, and the opposing ends of the opposing two-sided width portion are connected by an inner surface that forms a convex arc with a predetermined radius of curvature.

[0021] In addition, the hydraulically solidified body buried type reinforcing steel bar joint structure of the present invention is characterized in that the insertion hole has different cross-sectional areas in a first range from one end to the middle part in the axial direction and a second range from the other end to the above-mentioned middle part in the axial direction.

[0022] In addition, the hydraulically solidified body buried type reinforcing steel bar joint structure of the present invention is characterized in that the concave portion from one end to the middle part in the axial direction is spirally shaped, and the concave portion from the other end to the above-mentioned middle part is non-spirally shaped.

[0023] Furthermore, the joint structure of a steel rod for reinforcing a hydraulically solidified body embedded in the hydraulically solidified body of the present invention is characterized in that a relative rotation prevention member is provided at at least one axial end thereof to prevent relative rotation with the steel rod for reinforcing a hydraulically solidified body embedded in the hydraulically solidified body.

[0024] In addition, the joint structure of a reinforcing steel rod for embedding in a hydraulically solidified body of the present invention is characterized by the provision of a relative displacement prevention member at at least one axial end thereof to prevent relative displacement in the axial direction relative to the reinforcing steel rod for embedding in a hydraulically solidified body.

[0025] Furthermore, the joint structure of a reinforcing steel rod for embedding in a hydraulic solidified body of the present invention is characterized in that a rigid connection structure is provided at the axial end, and the rigid connection structure has a relative rotation prevention member that prevents relative rotation with the reinforcing steel rod for embedding in a hydraulic solidified body, and a relative displacement prevention member that prevents relative displacement with respect to the reinforcing steel rod for embedding in a hydraulic solidified body.

[0026] The hydraulically solidified body embedded type reinforcing steel rod joint structure of the present invention is characterized in that the relative rotation prevention member surrounds the hydraulically solidified body embedded type reinforcing steel rod and is inserted into the engagement hole.

[0027] In addition, the hydraulically solidified body-embedded reinforcing steel rod joint structure of the present invention is characterized in that the relative rotation prevention member has an engagement surface that engages with the inner circumference of the engagement hole, and a non-circular hydraulically solidified body-embedded reinforcing steel rod insertion hole that is approximately equivalent to the outer shape of the hydraulically solidified body-embedded reinforcing steel rod when viewed in the axial direction, and the hydraulically solidified body-embedded reinforcing steel rod can be fitted into the hydraulically solidified body-embedded reinforcing steel rod insertion hole in a state where relative rotation is prevented, and the engagement surface engages with the inner circumference of the engagement hole.

[0028] In addition, the hydraulically solidified body buried type reinforcing steel rod joint structure of the present invention is characterized in that the relative displacement prevention member engages with the rib of the hydraulically solidified body buried type reinforcing steel rod, thereby restricting axial displacement.

[0029] In addition, the hydraulically solidified body buried type reinforcing steel rod joint structure of the present invention is characterized in that the relative displacement prevention member has a hole portion through which the hydraulically solidified body buried type reinforcing steel rod can be inserted and which has a spiral groove on its inner surface.

[0030] Furthermore, the hydraulically solidified body buried type reinforcing steel bar joint structure of the present invention is characterized in that a relative rotation prevention mechanism is provided at the contact portion between the relative rotation prevention member and the relative displacement prevention member to prevent relative rotation between the relative rotation prevention member and the relative displacement prevention member.

[0031] Furthermore, the hydraulically solidified body buried type reinforcing steel rod joint structure of the present invention is characterized by having a confirmation hole penetrating from the inside to the outside at an appropriate intermediate position in the longitudinal direction of the main body, which allows the insertion depth of the hydraulically solidified body buried type reinforcing steel rod to be visually confirmed.

[0032] The hydraulically solidified body buried type reinforcing steel bar joint structure of the present invention is characterized in that the confirmation hole has a center position indicating means for indicating the center in the longitudinal direction.

[0033] In addition, the hydraulically solidified body buried type reinforcing steel rod joint structure of the present invention is characterized in that the confirmation hole has a constricted portion in which the hole shape is constricted at a point corresponding to the center of the longitudinal direction, and the constricted portion forms the center position indication means.

[0034] The hydraulically solidified body buried type reinforcing steel bar joint structure of the present invention is characterized in that the confirmation hole is closed with a light-transmitting member. [Effects of the Invention]

[0035] According to the present invention, a simple structure makes it possible to easily position and fix a hydraulically solidified body-embedded reinforcing steel rod joint structure at the desired axial position of a hydraulically solidified body-embedded reinforcing steel rod, improve the connectivity between 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]

[0036] [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 hydraulically solidified body buried type reinforcing steel bar joint structure according to this embodiment, in which FIG. 1A is a plan view and FIG. 1B is a cross-sectional view. [Figure 6] FIG. 1 is a cross-sectional view showing a hydraulically solidified body buried reinforcing steel bar joint structure. [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 inner circumference shapes of a hydraulically solidified body buried reinforcing steel bar joint structure. [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] 10A to 10C show another example of a hydraulically solidified body buried type reinforcing steel bar joint structure, where (a) is a plan view, (b) is a front view, and (c) is an AA cross-sectional view of (b). [Figure 13]10 is a diagram showing a slit whose width has been increased by elastic deformation of a thin-walled portion. FIG. [Figure 14] FIG. 10 is a perspective view showing another example of a hydraulically solidified body buried reinforcing steel bar joint structure. [Figure 15] FIG. 10 is a diagram showing the range over which a slit can expand. [Figure 16] 1A and 1B show a partial body that forms part of a hydraulically solidified body buried type reinforcing steel bar joint structure, in which (a) is a perspective view and (b) is a view showing the outer peripheral surface on the connecting portion side. [Figure 17] FIG. 1 is a perspective view showing a hydraulically solidified body buried reinforcing steel bar joint structure composed of partial bodies. [Figure 18] FIG. 10 is a perspective view showing another example of a hydraulically solidified body buried reinforcing steel bar joint structure. [Figure 19] FIG. 10 is a diagram showing the connection of two steel rods for reinforcing a hydraulically solidified body buried type using a joint structure for the steel rod for reinforcing a hydraulically solidified body buried type. [Figure 20] The figure shows a steel rod joint structure for reinforcing embedded in hydraulic solidified material, which has a non-helical concave portion and a helical concave portion, where (a) is an oblique view, (b) is a front view, and (c) is an AA cross-sectional view of (b). [Figure 21] 1A, 1B, and 1C show a relative rotation prevention member that engages with a hydraulically solidified body-buried reinforcing steel rod joint structure, in which FIG. 1A is a perspective view, FIG. 1B is a side view, and FIG. 1C is a cross-sectional view. [Figure 22] 1A, 1B, and 1C show a relative displacement prevention member, in which FIG. 1A is a perspective view, FIG. 1B is a side view, and FIG. 1C is a cross-sectional view. [Figure 23] FIG. 1 is a diagram showing a connection between a hydraulically solidified body buried type reinforcing steel rod joint structure and a hydraulically solidified body buried type reinforcing steel rod. [Figure 24] 10A and 10B are diagrams illustrating the installation of a relative rotation prevention member and a relative displacement prevention member. [Figure 25] 10A and 10B are diagrams illustrating another example of a relative rotation prevention member. [Figure 26] FIG. [Figure 27] FIG. 10 is a diagram showing a steel rod joint structure for reinforcing a hydraulically solidified body buried type, which is formed by connecting cylindrical members. [Figure 28]10A, 10B, and 10C show other examples of the shape of the rib, where (a) is a perspective view, (b) is a plan view, and (c) is a side view. DETAILED DESCRIPTION OF THE INVENTION

[0037] An embodiment of a joint structure for a hydraulically solidified body-embedded reinforcement steel rod for connecting hydraulically solidified body-embedded reinforcement steel rods according to the present invention will be described below with reference to the drawings. The joint structure for a hydraulically solidified body-embedded reinforcement steel rod is composed of a member that forms a tubular member as a whole, and is connected to a hydraulically solidified body-embedded reinforcement steel rod inserted into its end. The hydraulically solidified body-embedded reinforcement steel rods are connected to each other by inserting a hydraulically solidified body-embedded reinforcement steel rod into each end. Therefore, the joint structure for a hydraulically solidified body-embedded reinforcement steel rod has a structure for engaging with a hydraulically solidified body-embedded reinforcement steel rod.

[0038] 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 an AA cross-sectional view. FIG. 2 is a side view showing a rib 4 of the steel rod 1 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 to reinforce the hydraulically solidified body. The steel rod 1 for reinforcing a type of hydraulically solidified body embedded in an hydraulically solidified body has reduced diameter surfaces 2 located in two predetermined regions facing each other across the axis, ribs 4 arranged in a row in the axial direction and protruding radially outward, and concave diameter surfaces 6 that are alternately recessed in the ribs 4 in the axial direction. The steel rod 1 for reinforcing a type of hydraulically solidified body embedded in an hydraulically solidified body can be made of any appropriate material, such as steel. The reduced diameter surface 2 extends in the axial direction and is formed so that the radius from the axis gradually decreases toward the circumferential center of the region. The reduced diameter surface 2 may have, for example, a two-face width formed on the hydraulically solidified body-buried reinforcing steel bar 1.

[0039] The distance from the axis of the concave diameter surface 6 is set to be within the range of the distance from the axis of the reduced diameter surface 2. For example, the distance from the axis of the concave diameter surface 6 can be set to be a distance equivalent to the radius of the circumferential center or both ends of the reduced diameter surface 2.

[0040] As shown in Fig. 2, the rib 4 has a tip 10 at its radial end. A ridge 12 forming the tip 10 extends in a direction perpendicular to the axis, and both ends along the circumferential direction extend toward the reduced diameter surface 2. The rib 4 also has four faces 14a to 14d facing in different normal directions. These four faces 14a to 14d are each provided along an imaginary helical plane assumed around the axis of the steel bar 1 for reinforcing to be buried in a hydraulic solidified body.

[0041] 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.

[0042] 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.

[0043] The cross-sectional shape of the tip portion 10 may be approximately acute or obtuse, or may be approximately arc-shaped, or may be a minute flat surface, but preferably it is minute arc-shaped, which is easier to manufacture and less susceptible to damage, and which can improve the fit with the hydraulically solidified body buried reinforcing steel rod joint structure, as will be described later.

[0044] 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.

[0045] 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.

[0046] 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).

[0047] 4 shows another shape of the rib 4, where (a) is a side view, (b) is a front view, and (c) is a BB cross-sectional view 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 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.

[0048] 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.

[0049] 28 shows other examples of the shape of the rib 4, where (a) is a perspective view, (b) is a plan view, and (c) is a side view. The rib 4 has a three-dimensional curved surface whose protruding height in the direction perpendicular to the axis gradually decreases, and may have a boundary portion 151 between a rib engaging portion 150 in the central portion and a tip end 152 in the circumferential direction shown in FIG. 28. The rib 4 is also set to a shape in which the protruding height in the radial direction is greatest at the central portion and gradually decreases toward the tip end 152, approaching approximately zero at the point closest to the reduced diameter surface 2.

[0050] Specifically, the rib 4 has a shape that slopes in a generally mountain-like shape along the circumferential direction so that the protruding height gradually decreases from the center of the rib locking portion 150 toward the tip 152, and the slope from the boundary portion 151 toward the tip 152 is steeper than the slope of the rib locking portion 150. Furthermore, the rib locking portion 150 engages with a recessed portion 26, which will be described later, in the axial direction, and the reduction in the protruding height is set to be more gradual than that of the tip 152 in order to maintain the shear strength of the rib 4.

[0051] As described above, the reinforcing steel rods for embedding a hydraulic solidified body, such as those described in Patent Document 2 and Patent Document 3, have the problem of poor adhesion of the hydraulic solidified body when embedded in the body. However, according to the reinforcing steel rod 1 for embedding a hydraulic solidified body of the present invention, by having a shape with four faces 14a to 14d like the above-mentioned rib 4, or a shape with a rib engaging portion 150 and a tip portion 152 as shown in Figure 28, it is possible to improve the adhesion of the hydraulic solidified body, and also to easily screw the rib 4 into the reinforcing steel rod joint structure 20 for embedding a hydraulic solidified body, which will be described later.

[0052] Furthermore, the protruding height of the rib 4 may be set large to improve the pull-out strength when the hydraulically solidified body is buried. However, if the protruding height of the rib 4 is large, the rib 4 may extend up to the reduced diameter surface 2, or may protrude radially outward beyond the reduced diameter surface 2 at a position adjacent to the reduced diameter surface 2. Therefore, processing such as cutting the rib 4 is required to form the reduced diameter surface 2. In contrast, with the rib 4 shaped as shown in FIG. 28, the gradient of the inclination is made different between the rib engagement portion 150 between the boundary portion 151 and the tip portion 152, thereby improving mass productivity while maintaining the pull-out strength. Therefore, if the steel rod 1 for reinforcement to be embedded in a hydraulically solidified body has a rib 4 with a rib locking portion 150 and a tip portion 152, it is possible to continue to form the intended shape with high precision when mass-producing the steel rods 1 for reinforcement to be embedded in a hydraulically solidified body. Furthermore, since the rib 4 has the tip portion 10 (152), it can be easily fitted into the recessed portion 26 of the joint structure 20 for reinforcement of a hydraulically solidified body to be described later, thereby improving connectivity.

[0053] Next, we will explain the hydraulically solidified body embedded reinforcement steel rod joint structure 20. The hydraulically solidified body embedded reinforcement steel rod joint structure 20 is a joint that connects two hydraulically solidified body embedded reinforcement steel rods 1, and has an inner peripheral shape that can surround the hydraulically solidified body embedded reinforcement steel rod 1 with insertion holes that pass through in the axial direction.

[0054] 5 shows a hydraulically solidified body-embedded reinforcement steel rod joint structure 20 of this embodiment, with (a) being a plan view and (b) being a cross-sectional view. The hydraulically solidified body-embedded reinforcement steel rod joint structure 20 has an inner circumferential surface surrounding the hydraulically solidified body-embedded reinforcement steel rod 1. The inner circumferential surface is provided with large diameter surfaces 22 arranged at positions facing each other across the axis, and engaging protrusions 24 and recesses 26 adjacent to the large diameter surfaces 22 in the circumferential direction.

[0055] The large diameter surfaces 22 are set so as to be at approximately equal distances from the axis center 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 large diameter surfaces 22 are set to have a larger radius than the ribs 4 so as to be in a state of being ...

[0056] The engaging protrusions 24 are arranged in a plurality of rows in the axial direction, protruding radially inward from the large diameter surface 22 and extending circumferentially. The distance from the axial center 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.

[0057] 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 the bottoms are arranged radially outward from at least the ribs 4 at a predetermined relative position. That is, the depth of the recessed portions 26 may be set so that they are approximately equidistant from the axis, and they may 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.

[0058] Furthermore, the recessed portion 26 has an asymmetric shape with respect to an axis of symmetry parallel to the axial direction when viewed in the radial direction. That is, one circumferential end (the left end in FIG. 5(b)) forms an open end 28 with a widened width, and the width gradually decreases toward the other end (the right end in FIG. 5(b)), which forms 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. Furthermore, the radial protruding length of the stopper 29 is set so as to restrict at least circumferential displacement of the rib 4.

[0059] Furthermore, 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 recessed diameter surfaces 6 of the steel bar 1 for reinforcing a type of hydraulically solidified body to be buried, 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. Of course, the engaging protrusions 24 and recessed portions 26 may be set at positions opposite the engaging protrusions 24 and at positions opposite the recessed portions 26 so that their axial positions are not staggered, thereby corresponding to the setting of the steel bar 1 for reinforcing a type of hydraulically solidified body to be buried, in which the ribs 4 are set at the same axial positions.

[0060] 6 is a cross-sectional view showing a hydraulically solidified body buried type reinforcing steel bar joint structure 20, and shows the positional relationship between the engaging convex portions 24 and the concave portions 26 in two regions facing each other and spaced apart in the radial direction. As shown in Fig. 6, for the engaging convex portion 24 in one region located on the left side, a concave portion 26 is provided in the other region located on the right side, and for the concave portion 26 in one region, an engaging convex portion 24 is provided in the other region.

[0061] 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.

[0062] Next, a procedure for connecting the hydraulically solidified body-embedded reinforcing steel rod 1 and the hydraulically solidified body-embedded reinforcing steel rod joint structure 20 will be described. First, the hydraulically solidified body-embedded reinforcing steel rod 1 is inserted into the insertion hole of the hydraulically solidified body-embedded reinforcing steel rod joint structure 20. At this time, the reduced diameter surface 2 of the hydraulically solidified body-embedded reinforcing steel rod 1 is aligned in a position facing the engaging convex portion 24 and concave portion 26 of the hydraulically solidified body-embedded reinforcing steel rod joint structure 20. At this time, the hydraulically solidified body-embedded reinforcing steel rod 1 can be inserted axially without coming into contact with the hydraulically solidified body-embedded reinforcing steel rod joint structure 20. That is, since the reduced diameter surface 2 is located radially inward from the engaging protrusion 24 and the rib 4 is located radially inward from the large diameter surface 22, the hydraulically solidified body buried reinforcing steel rod 1 can be inserted without contacting the hydraulically solidified body buried reinforcing steel rod joint structure 20, and can be displaced in the axial direction.

[0063] After inserting the steel rod 1 for embedded reinforcement of a hydraulically solidified body, the joint structure 20 for embedded reinforcement of a hydraulically solidified body is rotated circumferentially relative to the steel rod 1 for embedded reinforcement of a hydraulically solidified body, and the steel rod 1 for embedded reinforcement of a hydraulically solidified body is fixed to the joint structure 20 for embedded reinforcement of a hydraulically solidified body. Figure 7 shows a schematic view of the entry of the rib 4 into the recessed portion 26, where (a) is a view showing the position before entry into the recessed portion 26 and (b) is a view showing the position when fitted into the recessed portion 26. In addition, Figure 7 shows the inner surface of the hydraulically solidified body buried type reinforcing steel rod joint structure 20 on the front side, and since surfaces 14a to 14d of rib 4 face the concave portion 26, the hydraulically solidified body buried type reinforcing steel rod 1 (not shown) is located on the front side of the paper, and the ridge line 12 of rib 4 etc. is shown by a dotted line, showing the state in which surfaces 14a to 14d face the concave portion 26 toward the back side of the paper.

[0064] The hydraulically solidified body-embedded reinforcing steel rod joint structure 20 rotates relatively in a predetermined direction so that the rib 4 shown in Fig. 7(a) enters the recessed portion 26 from the open end 28. The hydraulically solidified body-embedded reinforcing steel rod joint structure 20 is also rotated relatively to a position where the rib 4 shown in Fig. 7(b) 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.

[0065] When the rib 4 enters between the engaging protrusions 24, the hydraulically solidified body-embedded steel rod joint structure 20 is restricted from axial displacement relative to the hydraulically solidified body-embedded steel rod 1. That is, relative displacement between the hydraulically solidified body-embedded steel rod joint structure 20 and the hydraulically solidified body-embedded steel rod 1 is restricted in both directions, that is, when the hydraulically solidified body-embedded steel rod 1 is pulled out and pushed in relative to the hydraulically solidified body-embedded steel rod joint structure 20. Furthermore, when the rib 4 abuts against the closed end of the hydraulically solidified body-embedded steel rod joint structure 20, circumferential displacement along a predetermined rotational direction relative to the hydraulically solidified body-embedded steel rod 1 is restricted. Therefore, the hydraulically solidified body buried type reinforcing steel rod 1 is connected and fixed to the hydraulically solidified body buried type reinforcing steel rod joint structure 20.

[0066] Furthermore, the rib 4 of the reinforcing steel rod 1 for embedding in a hydraulic solidified body has a pointed tip 10, and the open end 28 of the concave portion 26 of the joint structure 20 for reinforcing steel rod for embedding in a hydraulic solidified body has a widened shape, which prevents the engaging protrusion 24 from getting caught on the rib 4 when the joint structure 20 for reinforcing steel rod for embedding in a hydraulic solidified body is rotated, making it easier to fit the rib 4 into the concave portion 26.

[0067] 4, the rib 4 can be more easily fitted into the recessed portion 26 without getting caught, which is preferable. As long as the engaging protrusion 24 has a surface at the circumferential end, even if the tip 10 is sharpened, the rib 4 and the engaging protrusion 24 will come into contact, and the relative rotation of the hydraulically solidified body buried steel rod joint structure 20 with respect to the hydraulically solidified body buried steel rod 1 for reinforcing may be restricted. 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 form the tip portion 10 and the circumferential end of the engaging protrusion 24 into a sharp shape, as shown in Figure 8(b). This prevents the ends from coming into contact with each other, and the rib 4 is more automatically guided into the recessed portion 26, making it easier to fit together, facilitating the connection between the steel bar 1 for reinforcement to be buried in a hydraulically solidified body and the joint structure 20 for a steel bar for reinforcement to be buried in a hydraulically solidified body.

[0068] The hydraulically solidified body-embedded reinforcing steel rod joint structure 20 is connected to the hydraulically solidified body-embedded reinforcing steel rod 1 by rotating it relative to the hydraulically solidified body-embedded reinforcing steel rod 1, but since the open end 28 is formed in the recessed portion 26, the hydraulically solidified body-embedded reinforcing steel rod joint structure 20 is in a state where it can rotate in the reverse direction. If the hydraulically solidified body-embedded reinforcing steel rod joint structure 20 rotates in the reverse direction, the connection between the hydraulically solidified body-embedded reinforcing steel rod 1 and the hydraulically solidified body-embedded reinforcing steel rod joint structure 20 will be released. Therefore, a reverse rotation prevention structure may be provided between the hydraulically solidified body-embedded reinforcing steel bar 1 and the hydraulically solidified body-embedded reinforcing steel bar joint structure 20. For example, the reverse rotation prevention structure can be formed by changing the shape of the recessed portion relative to the rib 4. Here, Fig. 9 is a view seen from the radial direction showing another example of the inner peripheral shape of the hydraulically solidified body-embedded reinforcing steel bar joint structure 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.

[0069] 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.

[0070] 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 come into contact with 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.

[0071] By fitting the rib 4 into the recessed portion 30 in this manner, even if a torque or the like is applied in the opposite direction to the rotational direction when the hydraulically solidified body buried type reinforcing steel rod joint structure 20 is connected to the hydraulically solidified body buried type reinforcing steel rod 1, in order for the rib 4 to come out of the recessed portion 30, it is necessary to apply a torque of a magnitude sufficient to elastically deform the surfaces 14c, 14d and / or the engaging protrusion 24, and as a result, a reverse rotation prevention structure is formed.

[0072] The reverse rotation prevention structure may also be formed by a separate member from the hydraulically solidified body-embedded steel rod 1 for reinforcement and the hydraulically solidified body-embedded steel rod joint structure 20. For example, when the hydraulically solidified body-embedded steel rod 1 for reinforcement is fixed to the hydraulically solidified body-embedded steel rod joint structure 20, the reduced diameter surface 2 of the hydraulically solidified body-embedded steel rod 1 for reinforcement faces the large diameter surface 22 of the hydraulically solidified body-embedded steel rod joint structure 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 in the form of a plate with an irregularly shaped perforated outer shape and including spacer portions 42 erected around the holes 44 in a direction approximately perpendicular to the plate surface.

[0073] Specifically, the hydraulically solidified body-embedded steel rod 1 is inserted into the hole 44 with the tip of the spacer portion 42 facing the hydraulically solidified body-embedded steel rod joint structure 20, and the rotation prevention member 40 is brought into contact with or close to the end face of the hydraulically solidified body-embedded steel rod joint structure 20, and the spacer portion 42 is inserted between the reduced diameter surface 2 and the large diameter surface 22 to fill the gap. As a result, even if an attempt is made to rotate the hydraulically solidified body-embedded steel rod joint structure 20 so that the rib 4 can be relatively displaced in a direction retracting from the recessed portion 30, the spacer portion 42 restricts the relative displacement of the rib 4, i.e., the rotation of the hydraulically solidified body-embedded steel rod joint structure 20 can be restricted.

[0074] When the rotation prevention member 40 is provided, for example, a nut may be screwed onto the hydraulically solidified body-embedded reinforcing steel rod 1 at a position facing the hydraulically solidified body-embedded reinforcing steel rod joint structure 20 across the rotation prevention member 40 to prevent detachment of the spacer portion 42. The spacer portion 42 may be formed in a wedge shape that is thinner from the base end to the tip end, or the outer surface of the erected surface may be made uneven to improve engagement. In this case, a corresponding uneven shape may also be formed on the large-diameter surface of the hydraulically solidified body-embedded reinforcing steel rod joint structure 20. Furthermore, such anti-rotation members can be applied to conventional hydraulically solidified body-embedded reinforcing steel rods and hydraulically solidified body-embedded reinforcing steel rod joints in which, when the hydraulically solidified body-embedded reinforcing steel rod and the hydraulically solidified body-embedded reinforcing steel rod joint are screwed together, an axial gap occurs between the hydraulically solidified body-embedded reinforcing steel rod and the hydraulically solidified body-embedded reinforcing steel rod joint.

[0075] In addition, the anti-rotation member 40 may be configured so that its irregularly shaped outer portion can be fitted into a receiving portion that can receive an irregular shape and is provided at the axial end of the hydraulically solidified body buried type reinforcing steel rod joint structure 20, thereby further effectively preventing relative rotation of the anti-rotation member 40 with respect to the hydraulically solidified body buried type reinforcing steel rod joint structure 20.

[0076] Furthermore, in the hydraulically solidified body buried type reinforcing steel rod joint structure 20, the concave portion 26 is shaped to have an open end 28 so that the rib 4 can be displaced circumferentially and enter the concave portion 26, but the hydraulically solidified body buried type reinforcing steel rod joint structure may also be shaped so that the rib 4 fits into the concave portion 26 from the radial direction.

[0077] 12 shows another example of a steel bar joint structure 50 for reinforcement embedded in a hydraulically solidified body, where (a) is a plan view, (b) is a front view, and (c) is an AA cross-sectional view of (b). The recessed portion 56 of the steel bar joint structure 50 for reinforcement embedded in a hydraulically solidified body has a shape symmetrical with respect to an axis of symmetry parallel to the axial direction, such as a substantially elliptical shape, a substantially oval shape, a substantially lip shape, a substantially rugby ball shape, a substantially egg shape, or a substantially diamond shape, when viewed in the radial direction. That is, both circumferential ends are closed, and the recessed portion 56 has a shape similar or approximate to the shape of the rib 4 when viewed in the radial direction. Of course, in the steel bar joint structure 50 for reinforcement embedded in a hydraulically solidified body, the rib 4 abuts on the inner circumferential surface, except for the large diameter surface 22 and the recessed portion 56.

[0078] The hydraulically solidified body-embedded steel bar joint structure 50 for reinforcement has a slit 52, a thin-walled portion 54, and a confirmation hole 58. The slit 52 extends in the axial direction at a location (where the large-diameter surface 22 is located) that is 90° out of phase with the recessed portion 56. The thin-walled portion 54 faces the slit 52 across the axis, and is formed to be elastically deformable so as to be able to expand the internal space by reducing the thickness of a portion of the large-diameter surface 22. The slit 52 and the thin-walled portion 54 function as expansion portions for expanding the internal space defined by the inner circumferential surface of the hydraulically solidified body-embedded steel bar joint structure 50 for reinforcement.

[0079] The confirmation hole 58 allows for visual inspection of the interior by penetrating the hydraulically solidified body buried type reinforcing steel rod joint structure 50 from the inside to the outside. The confirmation hole 58 opens at approximately the center in the axial direction of the hydraulically solidified body buried type reinforcing steel rod joint structure 50, with a size necessary for visual inspection within at least a predetermined range along the axial direction.

[0080] In the initial state in which the thin-walled portion 54 is not elastically deformed, when the hydraulically solidified body-embedded steel bar joint structure 50 rotates relative to the hydraulically solidified body-embedded steel bar 1 with the hydraulically solidified body-embedded steel bar 1 inserted therethrough and the rib 4 is displaced circumferentially from the position facing the large-diameter surface 22, the inner circumferential surface interferes with the rib 4, restricting the relative rotation. At this time, if the thin-walled portion 54 is bent and elastically deformed so as to expand the width of the slit 52 along the arrow shown in Figure 13, the diameter of the insertion hole of the hydraulically solidified body-embedded steel bar joint structure 50 can be expanded, and axial interference between the rib 4 of the hydraulically solidified body-embedded steel bar 1 and the engaging protrusion of the hydraulically solidified body-embedded steel bar joint structure 50 can be alleviated. Therefore, the inner surface and the rib 4 are in a non-interfering state, and the hydraulically solidified body buried type reinforcing steel rod joint structure 50 can rotate relative to the hydraulically solidified body buried type reinforcing steel rod 1, so that the rib 4 fits into the recessed portion 56.

[0081] The slits 52 may be formed by cutting out at least a portion of the hydraulically solidified body-buried reinforcing steel bar joint structure 50 in the circumferential direction, and may be configured as appropriate. For example, as shown in FIG. 14, a dovetail-shaped slit 52 may be provided. The dovetail-shaped slit 52 can restrict the range of expansion of the slit 52. That is, by loosely fitting a protrusion 102 into a dovetail-shaped recess 100 as shown in FIG. 15(a), the protrusion 102 fitted into the recess 100 is positioned so that it can be displaced in the circumferential direction, as shown in FIG. 15(b), thereby restricting the range of expansion of the slit 52. The expansion range of the slit 52 is restricted to such an extent that the mutual contact is released during the process of receiving the rib 4 of the hydraulically solidified body-embedded steel rod 1 into the inner periphery of the hydraulically solidified body-embedded steel rod joint structure 50, but the rib 4 and the engaging protrusion of the hydraulically solidified body-embedded steel rod joint structure 50 remain interfering with each other in the axial direction, and the slit 52 is not completely released. This makes it possible to allow the hydraulically solidified body-embedded steel rod 1 and the hydraulically solidified body-embedded steel rod joint structure 50 to rotate relative to each other, but to prevent them from being pulled out from each other.

[0082] Furthermore, the slits 52 are widened by the deflection of the thin portion 54, and the cross-sectional area of ​​the insertion hole of the hydraulically solidified body-buried reinforcing steel bar joint structure is increased, thereby expanding the internal space. However, the configuration for expanding the internal space can be set appropriately, and multiple radially separable sections may function as expansion sections. However, a separate member or mechanism that supports the sections together approximately integrally and that can displace them radially and / or circumferentially is required.

[0083] 16 shows a partial body 60 that forms part of the hydraulically solidified body-embedded steel bar joint structure for reinforcement, with (a) being a perspective view and (b) being a view showing the outer circumferential surface on the connecting portion side. The partial body 60 has a roughly semi-cylindrical shape obtained by dividing the hydraulically solidified body-embedded steel bar joint structure for reinforcement in half in the radial direction, and a pair of partial bodies 60 constitute the hydraulically solidified body-embedded steel bar joint structure for reinforcement.

[0084] The partial body 60 has a connecting portion 62 having a plurality of axially arranged rows of recessed portions 62a and protruding portions 62b, each of which has a dovetail-shaped circumferential end surface. The partial body 60 also has a recessed portion 56 on its inner peripheral surface. That is, the inner peripheral surface of the partial body 60 on the connecting portion 62 side forms a part of the large-diameter surface 22.

[0085] 17 is a perspective view showing a hydraulically solidified body-embedded steel rod joint structure for reinforcement composed of sections. The sections 60a, 60b can be connected to each other at their connecting portions 62, i.e., by fitting the convex portion of one section into the concave portion of the other section and vice versa, to form a hydraulically solidified body-embedded steel rod joint structure 50. The hydraulically solidified body-embedded steel rod joint structure 50 configured in this manner can be adjusted in radial displacement by loosely fitting the convex portion into the dovetail-shaped concave portion, as described above. As a result, the sections 60a, 60b can be displaced radially while being connected to each other to form the hydraulically solidified body-embedded steel rod joint structure 50, thereby allowing the size or diameter of the internal space to be varied and expanded.

[0086] The hydraulically solidified body-embedded steel rod joint structure for reinforcement is not limited to one composed of two sections, but may be composed of three or more sections. Furthermore, the sections may be connected to each other by a separate elastic member, rather than by a connecting portion. For example, multiple sections may be arranged in a joint shape and surrounded by an elastic member such as a C-ring or a coil spring. Alternatively, the expansion section for expanding the internal space of the hydraulically solidified body-embedded steel rod joint structure for reinforcement may be provided at two or more suitable locations in the circumferential direction with elastic portions that are elastically deformable in the circumferential direction and extend along the axial direction, allowing for expansion of the diameter. This method also allows the sections to be separated radially.

[0087] As described above, by making the recesses symmetrical, it is possible to connect a hydraulically solidified body-embedded steel rod joint structure and a hydraulically solidified body-embedded steel rod for reinforcing, it is possible to easily position and fix the hydraulically solidified body-embedded steel rod joint structure at a desired axial position of the hydraulically solidified body-embedded steel rod for reinforcing, it is possible to improve the connectivity between hydraulically solidified body-embedded steel rods, and it is possible to improve the pull-out strength of the hydraulically solidified body-embedded steel rod joint structure and the hydraulically solidified body-embedded steel rod when they are embedded in the solidified hydraulic body. Furthermore, if the recesses are symmetrical, after fitting the rib into the recesses, the relative rotation of the hydraulically solidified body-embedded steel rod joint structure with the hydraulically solidified body-embedded steel rod for reinforcing can be restricted, and the rib can be prevented from coming off the recesses. As a result, the connection between the hydraulically solidified body buried type reinforcing steel rod joint structure and the hydraulically solidified body buried type reinforcing steel rod can be made stronger.

[0088] The external shape of the hydraulically solidified body-embedded steel bar reinforcement joint structure is not particularly limited, but it is preferable that the joint structure have at least a two-flat shape to facilitate application of torque for relative rotation to the hydraulically solidified body-embedded steel bar. Furthermore, the hydraulically solidified body-embedded steel bar reinforcement joint structure, such as the hexagonal cylindrical hydraulically solidified body-embedded steel bar reinforcement joint structure 20 shown in Fig. 18, may have a polygonal external shape, including a star shape. Of course, the hydraulically solidified body-embedded steel bar reinforcement joint structure may be cylindrical with a two-flat shape along a portion of the axial direction, or may have a polygonal shape along only a portion of the axial direction.

[0089] Furthermore, the confirmation hole 58 may have a center position indicating means for indicating the longitudinal center of the hydraulically solidified body-embedded steel bar joint structure. Specifically, as shown in Fig. 18, a constricted portion 58a is provided with a narrower opening at a location corresponding to approximately the axial center of the hydraulically solidified body-embedded steel bar joint structure. This makes it possible to visually confirm the position of each hydraulically solidified body-embedded steel bar when inserting a hydraulically solidified body-embedded steel bar into each end of the hydraulically solidified body-embedded steel bar joint structure, and simultaneously and easily grasp the position of each hydraulically solidified body-embedded steel bar relative to the axial center of the hydraulically solidified body-embedded steel bar joint structure.

[0090] Here, the connection of two hydraulically solidified body-embedded steel rods 1a, 1b using a hydraulically solidified body-embedded steel rod joint structure 20 will be described with reference to Figure 19. First, the hydraulically solidified body-embedded steel rod 1a is inserted into one axial end of the hydraulically solidified body-embedded steel rod joint structure 20, as shown in Figure 19(a), and the hydraulically solidified body-embedded steel rod joint structure 20 is displaced toward the hydraulically solidified body-embedded steel rod 1a. At this time, the large diameter surface 22 on the inner circumferential surface of the hydraulically solidified body-embedded steel rod joint structure 20 faces the rib 4 of the hydraulically solidified body-embedded steel rod 1a.

[0091] 19(b), i.e., the hydraulically solidified body-embedded reinforcing steel rod joint structure 20 is temporarily fixed by rotating it by a small angle clockwise as shown by the arrow in FIG. 19(b), i.e., by rotating it relatively to the hydraulically solidified body-embedded reinforcing steel rod 1a so that the rib 4 fits somewhat into the recessed portion 26.

[0092] The hydraulically solidified body-embedded reinforcement steel rod joint structure 20 is aligned with the hydraulically solidified body-embedded reinforcement steel rod 1b, and the phases of the ribs of the hydraulically solidified body-embedded reinforcement steel rod 1a and the hydraulically solidified body-embedded reinforcement steel rod 1b temporarily fastened to the hydraulically solidified body-embedded reinforcement steel rod joint structure 20 are aligned. The other end of the hydraulically solidified body-embedded reinforcement steel rod joint structure 20 is then brought adjacent to the end face of the hydraulically solidified body-embedded reinforcement steel rod 1b, and the hydraulically solidified body-embedded reinforcement steel rod joint structure 20 is released from its temporarily fastened state to the hydraulically solidified body-embedded reinforcement steel rod 1a. That is, the hydraulically solidified body-embedded reinforcement steel rod joint structure 20 is rotated counterclockwise relative to the hydraulically solidified body-embedded reinforcement steel rod 1a, allowing it to be displaced axially relative to the hydraulically solidified body-embedded reinforcement steel rod 1a.

[0093] Next, the hydraulically solidified body-embedded reinforcement steel rod joint structure 20 is displaced axially relative to the hydraulically solidified body-embedded reinforcement steel rod 1a so that the hydraulically solidified body-embedded reinforcement steel rod 1b is inserted into the other axial end of the hydraulically solidified body-embedded reinforcement steel rod joint structure 20. That is, the hydraulically solidified body-embedded reinforcement steel rod joint structure 20 is displaced toward the hydraulically solidified body-embedded reinforcement steel rod 1b so that the hydraulically solidified body-embedded reinforcement steel rod 1b is inserted into the hydraulically solidified body-embedded reinforcement steel rod joint structure 20. As a result, as shown in Figure 19(c), the hydraulically solidified body-embedded reinforcement steel rod 1b can be inserted into the hydraulically solidified body-embedded reinforcement steel rod joint structure 20 by displacing it relatively in the opposite direction to the insertion of the hydraulically solidified body-embedded reinforcement steel rod 1a.

[0094] 19(c), since confirmation holes 58 are provided on the outer periphery of the hydraulically solidified body-embedded reinforcing steel rod joint structure 20, the positions of the ends of the hydraulically solidified body-embedded reinforcing steel rods 1a, 1b can be ascertained through the confirmation holes 58. Furthermore, the position of the axial center can be ascertained by the constricted portions 58a of the confirmation holes 58, and the axial positions of the hydraulically solidified body-embedded reinforcing steel rods 1a, 1b within the hydraulically solidified body-embedded reinforcing steel rod joint structure 20 can be ascertained approximately accurately.

[0095] Then, as shown in Figure 19(d), by rotating the hydraulically solidified body-embedded reinforcing steel rod joint structure 20 clockwise relative to the hydraulically solidified body-embedded reinforcing steel rods 1a, 1b, the hydraulically solidified body-embedded reinforcing steel rods 1a, 1b can be connected via the hydraulically solidified body-embedded reinforcing steel rod joint structure 20.

[0096] The concave portions of the hydraulically solidified body buried reinforcing steel bar joint structure have been described as being asymmetric or symmetrical in shape, but of course asymmetrical and symmetrical concave portions may also be arranged in a row in the axial direction, and the arrangement of the concave portions in this case may be such that asymmetrical and symmetrical concave portions are alternately arranged, or a hybrid structure may be used in which a symmetrical concave portion is arranged every few asymmetrical concave portions among multiple asymmetrical concave portions, or an appropriate combination arrangement may be used.

[0097] Of course, the recessed portion is not limited to a non-helical shape such as an asymmetrical or symmetrical shape, and may also be helical. Furthermore, the helical shape may extend continuously, or may be a series of approximately helical recessed portions intermittently arranged along a virtual helical path. A rib may be fitted into the helical recessed portion to relatively displace the rib along the helical direction. In this case, the helical shape is configured as a so-called right-handed helical groove, in which the inner circumferential surface of the recessed portion can slide against the surfaces 14a and 14d of the rib 4, thereby guiding the direction of displacement of the rib 4. Needless to say, it may also be configured as a so-called left-handed helical groove, in which the inner circumferential surface of the recessed portion slides against the surfaces 14b and 14c, thereby guiding the direction of displacement of the rib 4. As a result, the joint structure for a steel rod for reinforcement embedded in a hydraulically solidified body can be displaced axially by rotation relative to the steel rod for reinforcement embedded in a hydraulically solidified body. In addition, when the concave portion has a spiral shape, the shape of the radial end of the engaging protrusion can be set appropriately, and can be set to, for example, a planar shape, a convex curved shape, an acute angle shape, a pointed shape, etc. Furthermore, the spiral groove shape of the concave portion can be set appropriately, for example, by configuring the width shape of the groove to narrow gradually or in steps from one end to the middle in the axial direction.

[0098] The hydraulically solidified body-embedded steel rod joint structure for reinforcement may have both a non-helical recessed portion and a helical recessed portion. Figure 20 shows a hydraulically solidified body-embedded steel rod joint structure 70 having a non-helical recessed portion and a helical recessed portion, where (a) is a perspective view, (b) is a front view, and (c) is an AA cross-sectional view of (b). The hydraulically solidified body-embedded steel rod joint structure 70 for reinforcement has a non-helical recessed portion 72a at one end and a helical recessed portion 72b at the other end, with the boundary being midway in the axial direction. Of course, in such a hybrid structure of recesses, the boundary between the non-helical region and the helical region may be directly connected or may have an appropriate gap therebetween.

[0099] The hydraulically solidified body-embedded steel bar joint structure 70 for reinforcement also has engagement holes 74 at both ends. The engagement holes 74 are located at the ends of the insertion holes of the hydraulically solidified body-embedded steel bar joint structure 70, and have a tapered inner circumferential surface that widens toward the opening. A flat knurling is formed along the axial direction on the inner circumferential surface of the engagement hole 74. The engagement hole 74 is designed to have a larger diameter than the insertion hole of the hydraulically solidified body-embedded steel bar joint structure 70 for reinforcement so that a relative rotation prevention member 80 (described later) can be interposed between the engagement hole 74 and the hydraulically solidified body-embedded steel bar 1 for reinforcement.

[0100] Although the engagement hole 74 here is tapered, it does not necessarily have to be tapered and may be straight, curved, or curved. However, a tapered shape is preferable when attempting to absorb dimensional errors, etc.

[0101] 21 shows a relative rotation prevention member 80 that engages with the hydraulically solidified body-embedded reinforcing steel rod joint structure 70, with (a) being a perspective view, (b) being a side view, and (c) being a cross-sectional view. The relative rotation prevention member 80 has a substantially ring-shaped main body 82 and a flange 84. Note that although the flange 84 is shown here, this is not necessarily required. The relative rotation prevention member 80 also has an inner circumferential surface 86 that surrounds the hydraulically solidified body-embedded reinforcing steel rod 1.

[0102] The main body 82 has an outer shape that can engage with the engagement hole 74. That is, the outer peripheral surface of the main body 82 has a tapered shape that gradually reduces in diameter from the flange 84 side, corresponding to the inner peripheral surface of the engagement hole 74. In addition, a flat knurling is formed on the outer peripheral surface of the main body 82 along the axial direction. Note that the outer peripheral shape of the main body 82 is not limited to a tapered shape, and can be set to a straight shape, a curved shape, a curved line shape, etc., and is preferably a shape that corresponds to the engagement hole 74. Furthermore, the flat knurling along the axial direction is not necessarily limited to a flat knurling shape, and can be set as appropriate as long as it can engage with the anti-rotation means provided in the engagement hole 74 to prevent relative rotation.

[0103] The flange portion 84 has an outer diameter larger than that of the main body portion 82, and a plurality of irregularities 84a are formed along the circumferential direction on its axial end face. These irregularities 84a preferably have a sawtooth shape, and are preferably set so that the direction in which the irregularities 84a extend, i.e., the direction in which the ridges extend, is aligned with the radial direction of the relative rotation preventing member 80. As a result, the irregularities 84a on the end face of the flange portion 84 extend radially from the axis.

[0104] The inner circumferential surface 86 is composed of a pair of interference surfaces 86a that can interfere with the rib 4 without contacting the reduced diameter surface 2 of the steel bar 1 for reinforcement to be buried in a hydraulically solidified body, and a pair of non-contact surfaces 86b that face the rib 4 with a gap between them. That is, the interference surfaces 86a and the non-contact surfaces 86b of the inner circumferential surface 86 are arranged alternately in the circumferential direction. That is, the hole defined in the inner circumferential surface 86 can function as a non-circular steel bar insertion hole for reinforcement to be buried in a hydraulically solidified body, whose shape as viewed in the axial direction roughly corresponds to the outer shape of the steel bar 1 for reinforcement to be buried in a hydraulically solidified body.

[0105] When the relative rotation prevention member 80 is interposed between the hydraulically solidified body-embedded steel rod joint structure 70 and the hydraulically solidified body-embedded steel rod 1, it can restrict the hydraulically solidified body-embedded steel rod joint structure 70 from rotating relative to the hydraulically solidified body-embedded steel rod 1. Specifically, the relative rotation prevention member 80 is placed in advance in a state where it surrounds the outer circumferential surface of the hydraulically solidified body-embedded steel rod 1. At this time, the hydraulically solidified body-embedded steel rod 1 is fitted into the hydraulically solidified body-embedded steel rod insertion hole in a state where it cannot rotate relative to the hydraulically solidified body.

[0106] Next, the hydraulically solidified body-embedded steel rods 1 for reinforcement are inserted into both ends of the hydraulically solidified body-embedded steel rod joint structure 70, and the ribs 4 are fitted into the recessed portions 72a, 72b. The relative rotation prevention member 80 is inserted into the engagement hole 74 by sliding along the axial direction toward the hydraulically solidified body-embedded steel rod joint structure 70. Then, the flat knurling of the main body 82 and the flat knurling of the engagement hole 74 of the hydraulically solidified body-embedded steel rod joint structure 70 are engaged in the circumferential direction. That is, the concave and convex portions of the flat knurlings are matched and engaged in the circumferential direction.

[0107] As a result, the relative rotation prevention member 80 circumferentially engages with each of the hydraulically solidified body-embedded steel bar 1 for reinforcement and the hydraulically solidified body-embedded steel bar joint structure 70. That is, the flat knurling on the outer periphery of the main body 82 circumferentially engages with the flat knurling of the engagement hole 74. On the other hand, when the interference surface 86a of the inner circumferential surface 86 is displaced circumferentially from the position facing the reduced diameter surface 2 of the hydraulically solidified body-embedded steel bar 1 for reinforcement, it interferes with the rib 4, and as a result, the inner circumferential surface 86 circumferentially engages with the hydraulically solidified body-embedded steel bar 1 for reinforcement.

[0108] Next, Figure 22 shows a relative displacement prevention member 90, where (a) is a perspective view, (b) is a side view, and (c) is a cross-sectional view. The relative displacement prevention member 90 is a hollow member with a roughly hexagonal outer shape and a hole 90a that can surround the hydraulically solidified body-buried reinforcing steel bar 1, and has a continuous spiral groove portion 92 on its inner circumferential surface. The relative displacement prevention member 90 also has a flange-shaped end portion, and a plurality of uneven portions 94 are formed along the circumferential direction on one end face in the axial direction. The uneven portion 94 is configured to be undulating in an appropriate shape that can engage with the unevenness 84a of the flange portion 84, but in this case it is configured to be saw-tooth shaped and extend radially from the axis.

[0109] Therefore, at the location where the relative rotation prevention member 80 and the relative displacement prevention member 90 come into contact, the unevenness 84a and the unevenness portion 94 function as a relative rotation prevention mechanism that prevents relative rotation between the two members 80, 90.

[0110] The spiral direction of the spiral groove portion 92 is set so that the rib 4 of the steel bar 1 for reinforcement to be buried in a hydraulically solidified body can be fitted into it. Of course, the spiral direction can be set as appropriate, but here the spiral direction of the spiral groove portion 92 is set to a left-handed spiral, opposite to the spiral of the recessed portion 72b. By fitting the rib 4 into the spiral groove portion 92, it engages with the rib 4 and restricts axial displacement, but when the relative displacement prevention member 90 itself is rotated, it can be displaced in the axial direction relative to the steel bar 1 for reinforcement to be buried in a hydraulically solidified body.

[0111] The following describes the connection between the hydraulically solidified body-embedded reinforcing steel rod joint structure 70 and the hydraulically solidified body-embedded reinforcing steel rod 1 using a rigid connection structure that combines the above-mentioned relative rotation prevention member 80 and relative displacement prevention member 90. Two hydraulically solidified body-embedded reinforcing steel rods 1a, 1b are inserted into the hydraulically solidified body-embedded reinforcing steel rod joint structure 70, with the rib 4 of one hydraulically solidified body-embedded reinforcing steel rod 1a fitting into the recessed portion 72a and the rib 4 of the other hydraulically solidified body-embedded reinforcing steel rod 1b fitting into the right-handed spiral recessed portion 72b.

[0112] In this case, the other hydraulically solidified body-embedded reinforcing steel rod 1b is connected first. Specifically, the hydraulically solidified body-embedded reinforcing steel rod 1b is positioned at the opening at the other end (the upper end in FIG. 23) of the hydraulically solidified body-embedded reinforcing steel rod joint structure 70, and the positioning is performed so that the recessed portion 72b can fit into the rib 4. Next, as shown in FIG. 23(a), when the hydraulically solidified body-embedded reinforcing steel rod joint structure 70 is rotated clockwise relative to the hydraulically solidified body-embedded reinforcing steel rod 1b, the hydraulically solidified body-embedded reinforcing steel rod 1b is displaced relative to the hydraulically solidified body-embedded reinforcing steel rod joint structure 70. That is, by rotating the hydraulically solidified body buried type reinforcing steel rod joint structure 70, the rib 4 fitted into the concave portion 72b is guided in the direction of the spiral, and as a result, the hydraulically solidified body buried type reinforcing steel rod 1b is relatively displaced in the direction along the spiral and moves to the innermost part along the concave portion 72b.

[0113] Next, one of the hydraulically solidified body-embedded reinforcing steel rods 1a is connected. Specifically, as shown in Figure 23(b), the hydraulically solidified body-embedded reinforcing steel rod 1a is inserted into the insertion hole from one axial end of the hydraulically solidified body-embedded reinforcing steel rod joint structure 70, while checking the depth position of the hydraulically solidified body-embedded reinforcing steel rod 1a using the confirmation hole 58. At this time, the reduced diameter surface 2 of the hydraulically solidified body-embedded reinforcing steel rod 1a is aligned with the position facing the recessed portion 72a of the hydraulically solidified body-embedded reinforcing steel rod joint structure 70. Then, as shown in Figure 23(c), by rotating the hydraulically solidified body-embedded reinforcing steel rod joint structure 70 counterclockwise relative to the hydraulically solidified body-embedded reinforcing steel rod 1a by a predetermined angle, in this case about 90°, the rib 4 enters and fits into the recessed portion 72a, and the hydraulically solidified body-embedded reinforcing steel rod joint structure 70 and the hydraulically solidified body-embedded reinforcing steel rod 1a engage in the axial direction.

[0114] Next, the relative rotation prevention member 80 is installed. Specifically, as shown in Figure 24(a), the relative rotation prevention member 80, which has been inserted in advance into the hydraulically solidified body-embedded reinforcing steel rod 1a (1b), is slid toward the hydraulically solidified body-embedded reinforcing steel rod joint structure 70 while surrounding the hydraulically solidified body-embedded reinforcing steel rod 1a (1b), and inserted into the engagement hole 74. Furthermore, the relative displacement prevention member 90, which has been screwed leftward into the hydraulically solidified body-embedded reinforcing steel rod 1a (1b) prior to the relative rotation prevention member 80, is rotated in the direction that advances toward the relative rotation prevention member 80, i.e., leftward relative to the hydraulically solidified body-embedded reinforcing steel rod 1a (1b). As a result, the irregularities 84a on the end surface of the flange portion 84 and the irregularity portion 94 approach and come into contact, and the irregularities engage with each other.

[0115] By combining the relative rotation prevention member 80 and the relative displacement prevention member 90 in this manner, it is possible to more firmly connect the hydraulically solidified body-embedded reinforcing steel rod 1 and the hydraulically solidified body-embedded reinforcing steel rod joint structure 70. That is, the inner periphery of the relative rotation prevention member 80 circumferentially engages with the hydraulically solidified body-embedded reinforcing steel rod 1, and the outer periphery of the relative rotation prevention member 80 circumferentially engages with the hydraulically solidified body-embedded reinforcing steel rod joint structure 70, so that when one of the hydraulically solidified body-embedded reinforcing steel rod joint structure 70 and the hydraulically solidified body-embedded reinforcing steel rod 1 rotates relative to the other, the rotation is restricted by the relative rotation prevention member 80. Therefore, the state in which the rib 4 is fitted into the recessed portions 72a, 72b can be firmly maintained. Furthermore, since the relative displacement prevention member 90 is disposed axially outward of the relative rotation prevention member 80, it is possible to reliably prevent the relative rotation prevention member 80 from coming off the engagement hole 74 in the axial direction.

[0116] Furthermore, although the relative displacement prevention member 90 can easily displace in the circumferential direction relative to the hydraulically solidified body-embedded reinforcing steel rod 1, the circumferential engagement between the flange portion 84 and the uneven portion 94 prevents the relative displacement prevention member 90 from rotating in a direction that could move it away from the hydraulically solidified body-embedded reinforcing steel rod joint structure 70, and the relative rotation prevention member 80 and the relative displacement prevention member 90 are firmly fixed together. Therefore, the hydraulically solidified body-embedded reinforcing steel rod joint structure 70, the relative rotation prevention member 80, and the relative displacement prevention member 90 can be substantially integrated and very firmly connected to the hydraulically solidified body-embedded reinforcing steel rod 1, making it possible to eliminate the need for the injection of a fluid hardening filler or the like, which was previously required.

[0117] In addition, the above-mentioned confirmation hole may be blocked by a light-transmitting material such as a transparent film or a transparent resin material, as long as it allows at least the hydraulically solidified body-buried reinforcing steel rod inside the hydraulically solidified body-buried reinforcing steel rod joint structure to be visible.

[0118] Although the main body of the relative rotation prevention member 80 is cylindrical, it may be shaped so as to be elastically deformable in the radial direction. For example, as shown in FIG. 25, the main body 82 may be formed with slits 87 extending along the axial direction. The slits 87 may be formed at predetermined intervals along the circumferential direction, or as shown in FIG. 25(b), the slits 87 may be formed by cutting out a portion of the non-contact surface 86b along the axial direction. Furthermore, the slits 87 may be formed so as to extend widely in the circumferential direction of the main body 82 as shown in FIG. 25(c), and the size and number of the slits may be set as appropriate. By forming such slits 87, the main body 82 can elastically and / or plastically deform so as to bend inward, thereby more firmly adhering to the steel rod 1 for embedded in a hydraulically solidified body. That is, the slits 87 cause the outer circumferential surface of the main body 82 to be intermittently divided in the circumferential direction, making each portion more susceptible to elastic and / or plastic deformation. Furthermore, when the main body 82 elastically and / or plastically deforms radially inward, the inner circumferential surface of the main body 82 comes into close contact with the outer circumferential surface of the steel rod 1 for embedded in a hydraulically solidified body and presses it radially inward. As a result, the relative rotation prevention member 80 can be more firmly fixed to the steel rod 1 for embedded in a hydraulically solidified body. Furthermore, although the outer circumferential surface of the main body 82 has a tapered shape corresponding to the inner circumferential surface of the engagement hole 74, it may also have a different tapered shape from the engagement hole 74 so that it is pressed radially inward by the inner circumferential surface of the engagement hole 74. Specifically, if the taper angle is slightly gentler than that of the engagement hole 74 and the outer diameter of the axial tip of the main body portion 82 is made to exceed the inner diameter of the innermost part of the engagement hole 74, the main body portion 82 will gradually be pressed against the inner surface of the engagement hole 74 as it enters the engagement hole 74, and will reliably elastically deform radially inward to firmly adhere to the hydraulically solidified body-buried reinforcing steel rod 1.

[0119] Furthermore, the joint structure for a steel rod for embedded reinforcement of a hydraulically solidified body may be configured to allow insertion of a steel rod for embedded reinforcement of a hydraulically solidified body having different diameters at one end and both ends in the axial direction. That is, the joint structure for a steel rod for embedded reinforcement of a hydraulically solidified body may be configured to connect steel rods for embedded reinforcement of a hydraulically solidified body having different diameters, and in this case, the cross-sectional area and diameter of a first range from one end to the middle of the axial direction may be configured to be different from the cross-sectional area and diameter of a second range from the other end to the middle of the axial direction.

[0120] Furthermore, the hydraulically solidified body buried type reinforcing steel rod joint structure is not limited to one made up of a single member, but may be made up of multiple members. For example, as shown in Figure 26, a hydraulically solidified body buried type reinforcing steel rod joint structure 130 may be made up of two axially separated cylindrical members 110, 120. The cylindrical member 110 has an opening at one end in the axial direction through which the hydraulically solidified body buried reinforcing steel rod 1 can be inserted, and a connecting portion 112 consisting of a spiral groove is arranged on the outer circumferential surface of the other end. Also, as shown in Figure 26(b), the inner circumferential surface of the cylindrical member 110 is arranged with large diameter surfaces 22 arranged at positions facing each other across the axis, and an engaging protrusion 24 and a recess 26 adjacent to the large diameter surface 22 in the circumferential direction.

[0121] The cylindrical member 120 has an opening at one end in the axial direction through which the hydraulically solidified body buried reinforcing steel rod 1 can be inserted, and has a surrounding portion 122 at the other end. The surrounding portion 122 has a large diameter so that its inner circumferential surface can surround the connecting portion 112, and a spiral convex portion that extends spirally and fits into the spiral groove of the connecting portion 112 is provided on its inner circumferential surface. The inner peripheral surface of the cylindrical member 110 is provided with a large diameter surface 22 arranged at positions facing each other across the axis, and an engaging protrusion 24 and a recess 26 adjacent to the large diameter surface 22 in the circumferential direction.

[0122] The tubular members 110, 120 are connected by threading the connecting portion 112 into the surrounding portion 122 to form a hydraulically solidified body buried reinforcing steel rod joint structure 130 (see Figure 27). Of course, the structure for connecting the tubular members 110, 120 is not limited to this, and it is sufficient that these tubular members 110, 120 are connected so as to be rotatable relative to each other and so as to restrict relative displacement in the axial direction, and it goes without saying that a configuration in which they are connected using a third member, for example, may also be used.

[0123] By configuring such a steel rod joint structure 130 for embedded hydraulic solidified body reinforcement, when inserting steel rods 1, 1 for embedded hydraulic solidified body reinforcement into both ends in the axial direction, it is possible to absorb imperfections in the connection due to phase misalignment between the steel rods 1, 1 for embedded hydraulic solidified body reinforcement. That is, if the positions of the ribs 4 are different between the steel rods 1, 1 for embedded hydraulic solidified body reinforcement, even if the rib 4 of one steel rod 1 for embedded hydraulic solidified body reinforcement is fitted into the recessed portion 26, there is a risk that the rib 4 of the other steel rod 1 for embedded hydraulic solidified body reinforcement will not be fitted into the recessed portion 26; however, this can be absorbed and prevented. Specifically, by rotating either one of the tubular members 110, 120 at least a small angle (less than 90°), both tubular members 110, 120 can reliably fit the rib 4 of the inserted hydraulically solidified body buried reinforcing steel rod 1 into the recessed portion 26. [Explanation of symbols]

[0124] 1...steel rod for reinforcing a type of hydraulically solidified body 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...joint structure of steel rod for reinforcing a type of hydraulically solidified body to be buried 22...large diameter surface 24...engaging convex portion 26...concave portion 28, 32...open end 29...stopper 40...rotation prevention member 42...spacer portion 44...hole 52...slit 58...confirmation hole 60...part body 74...engaging hole 80...relative rotation prevention member 82...main body portion 84...flange portion 90...relative displacement prevention member 92...spiral groove portion 94...uneven portion.

Claims

1. A joint structure for a steel rod for reinforcing a hydraulically solidified body embedded in a reinforcement has an insertion hole through which a steel rod for reinforcing a hydraulically solidified body embedded in a reinforcement direction can be inserted in an axial direction, and an inner periphery of the insertion hole is engaged with a rib of the steel rod for reinforcing a hydraulically solidified body to connect the steel rod for reinforcing a hydraulically solidified body embedded in a reinforcement direction, engaging projections arranged in a row in the axial direction on the inner periphery and capable of engaging with the ribs; at least one or more types of non-helical recessed portions alternate with the engaging protrusions in the axial direction and are recessed so that the ribs can be fitted therein; a large diameter surface that is circumferentially adjacent to the engaging protrusion and the recess, and that does not engage with the rib; The concave portion has a hybrid structure in which the non-helical shape has a symmetric shape and an asymmetric shape with the axial direction as an axis of symmetry when viewed in the radial direction, and is arranged in a row in the axial direction, and the symmetric shapes and the asymmetric shapes are arranged, A joint structure for a steel rod for reinforcing a hydraulically solidified body to be buried, characterized in that the rib is fitted into the recessed portion to restrict axial displacement of the steel rod for reinforcing a hydraulically solidified body to be buried.

2. A joint structure for a steel rod for reinforcing a hydraulically solidified body embedded in a reinforcement has an insertion hole through which a steel rod for reinforcing a hydraulically solidified body embedded in a reinforcement direction can be inserted in an axial direction, and an inner periphery of the insertion hole is engaged with a rib of the steel rod for reinforcing a hydraulically solidified body to connect the steel rod for reinforcing a hydraulically solidified body embedded in a reinforcement direction, engaging projections arranged in a row in the axial direction on the inner periphery and capable of engaging with the ribs; at least one type of recessed portion alternately arranged with the engaging protrusions in the axial direction and recessed so that the rib can be fitted therein; a large diameter surface that is circumferentially adjacent to the engaging protrusion and the recess, and that does not engage with the rib; The insertion hole has a substantially oval or elliptical hole shape when viewed in the axial direction, A joint structure for a steel rod for reinforcing a hydraulically solidified body to be buried, characterized in that the rib is fitted into the recessed portion to restrict axial displacement of the steel rod for reinforcing a hydraulically solidified body to be buried.

3. The symmetrical shape has closed ends at both ends in the circumferential direction, The main body of the hydraulically solidified body buried type reinforcing steel rod joint structure has an expansion part that allows the internal space to be expanded, The hydraulically solidified body-buried reinforcing steel rod joint structure according to claim 1, characterized in that the expansion portion is capable of transitioning between a state in which the rib is received on the inner circumference and a state in which the insertion hole is expanded to receive the rib on the inner circumference.

4. 4. The hydraulically solidified body buried reinforcing steel bar joint structure according to claim 3, wherein the expansion portion has an elastic deformation mechanism and / or a radial separation mechanism.

5. The hydraulically solidified body-buried reinforcing steel rod joint structure according to claim 1, characterized in that the asymmetrically shaped concave portion has an open end at one circumferential end, and can receive the rib from the open end side.

6. A hydraulically solidified body-buried reinforcing steel rod joint structure as described in claim 5, characterized in that the other circumferential end of the asymmetrically shaped concave portion is a closed end, and the closed end can regulate the circumferential displacement of the rib.

7. The recessed portion has a spiral shape, 3. A hydraulically solidified body-buried reinforcing steel bar joint structure according to claim 2, wherein the radial end of said engaging projection is formed in a planar shape, a convex curved shape or an acute angle shape.

8. The hydraulically solidified body buried reinforcing steel rod joint structure according to claim 7, characterized in that the spiral-shaped concave portion is formed continuously or intermittently along a virtually set spiral path.

9. A hydraulically solidified body-buried reinforcing steel rod joint structure as described in claim 7, characterized in that the spiral-shaped concave portion is formed continuously and the width of the concave portion gradually or stepwise narrows from one end to the middle of the axial direction.

10. A hydraulically solidified body-embedded reinforcing steel rod joint structure according to any one of claims 1 to 9, characterized in that the insertion hole has a hole shape, when viewed in the axial direction, that is approximately similar or approximate to the outer shape of the hydraulically solidified body-embedded reinforcing steel rod when viewed in the axial direction.

11. The hydraulically solidified body buried reinforcing steel rod joint structure according to claim 10, characterized in that the insertion hole has a two-sided width portion, and the opposing ends of the opposing two-sided width portion are connected by an inner surface that forms a convex arc with a predetermined radius of curvature.

12. A hydraulically solidified body-buried reinforcing steel bar joint structure as described in any one of claims 1 to 11, characterized in that the cross-sectional area of ​​the insertion hole is different between a first range from one end to the middle part in the axial direction and a second range from the other end to the middle part in the axial direction.

13. A hydraulically solidified body buried reinforcing steel rod joint structure as described in claim 2, characterized in that the concave portion from one end to the middle portion in the axial direction is spirally shaped, and the concave portion from the other end to the middle portion is non-spirally shaped.

14. A hydraulically solidified body-buried reinforcing steel rod joint structure as described in any one of claims 1 to 13, characterized in that a relative rotation prevention member is provided at at least one axial end to prevent relative rotation with the hydraulically solidified body-buried reinforcing steel rod.

15. A hydraulically solidified body-buried reinforcing steel rod joint structure as described in any one of claims 1 to 13, characterized in that a relative displacement prevention member is provided at at least one axial end to prevent relative axial displacement with the hydraulically solidified body-buried reinforcing steel rod.

16. A rigid structure is provided at the axial end, A hydraulically solidified body-embedded reinforcing steel rod joint structure as described in any one of claims 1 to 13, characterized in that the rigid connection structure has a relative rotation prevention member that prevents relative rotation with the hydraulically solidified body-embedded reinforcing steel rod and a relative displacement prevention member that prevents relative displacement with respect to the hydraulically solidified body-embedded reinforcing steel rod.

17. 17. A joint structure for a steel rod for reinforcing a hydraulically solidified body buried type according to claim 14 or 16, wherein the relative rotation prevention member surrounds the hydraulically solidified body buried type reinforcing steel rod and is inserted into the engagement hole.

18. The relative rotation prevention member has an engagement surface that engages with an inner periphery of the engagement hole; a non-circular steel rod insertion hole for reinforcing a hydraulically solidified body that is substantially equivalent to the outer shape of the steel rod for reinforcing a hydraulically solidified body when viewed in the axial direction; A hydraulically solidified body-embedded reinforcing steel rod joint structure according to claim 14, 16 or 17, characterized in that the hydraulically solidified body-embedded reinforcing steel rod can be fitted into the hydraulically solidified body-embedded reinforcing steel rod insertion hole in a state where it cannot rotate relative to the hydraulically solidified body, and the engagement surface engages with the inner circumference of the engagement hole.

19. 17. A hydraulically solidified body-buried reinforcing steel rod joint structure according to claim 15 or 16, characterized in that the relative displacement prevention member engages with a rib of the hydraulically solidified body-buried reinforcing steel rod, thereby restricting axial displacement.

20. The hydraulically solidified body-buried reinforcing steel rod joint structure according to claim 15, 16 or 19, characterized in that the relative displacement prevention member has a hole portion through which the hydraulically solidified body-buried reinforcing steel rod can be inserted and which has a spiral groove on its inner surface.

21. A hydraulically solidified body buried reinforcing steel rod joint structure as described in claim 16, characterized in that a relative rotation prevention mechanism is provided at the abutment portion between the relative rotation prevention member and the relative displacement prevention member to prevent relative rotation between the relative rotation prevention member and the relative displacement prevention member.

22. A hydraulically solidified body-buried reinforcing steel rod joint structure as described in any one of claims 1 to 21, characterized in that at an appropriate intermediate position in the longitudinal direction of the main body, there is provided a confirmation hole penetrating from the inside to the outside, which allows the insertion depth of the hydraulically solidified body-buried reinforcing steel rod to be visually confirmed.

23. 23. The hydraulically solidified body buried reinforcing steel bar joint structure according to claim 22, wherein the confirmation hole has a center position indicating means for indicating the center portion in the longitudinal direction.

24. The hydraulically solidified body buried reinforcing steel rod joint structure according to claim 23, characterized in that the confirmation hole has a constricted portion in which the hole shape is constricted at a point corresponding to the center of the longitudinal direction, and the constricted portion forms the center position indication means.

25. 25. The hydraulically solidified body buried reinforcing steel bar joint structure according to claim 22, wherein the confirmation hole is closed with a light-transmitting member.

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