Reinforcement bar with anchoring member and its manufacturing method

Abstract

To provide a reinforcing bar with a fixing member excellent in workability and capable of assembling in a short time, and to provide a method for manufacturing the same.SOLUTION: A reinforcing bar 1 with an anchoring member provided with an anchoring member 3 at the end of a reinforcing bar 4 is provided with an intermediate shaft member 2, while in a state at least whose one end is exposed and another end side is cast in and fixed to the anchoring member 3 and one end is jointed to the end of a reinforcing bar 4.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a reinforcing bar with an anchoring member and a manufacturing method thereof. [Background technology]

[0002] Mechanical anchoring methods have been known for increasing the shear strength of structures by restraining reinforcing bars.

[0003] Patent Document 1 discloses a structure that uses an anchoring member that has a tubular portion with a female thread that can be screwed onto the end of a threaded reinforcing bar that is connected to the main reinforcement by friction welding or the like, and a flange portion that extends radially outward from the tubular portion, and improves the screwing strength between the anchoring member and the threaded reinforcing bar by filling grout into the clearance between the threaded reinforcing bar and the female thread while the threaded reinforcing bar is screwed into the tubular portion, or by screwing a lock nut onto the threaded reinforcing bar. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-132164 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the mechanical anchoring method using the anchoring members described above requires a special tool to fill the clearance between the threaded rebar and the female thread with grout, and the filling process is cumbersome. Furthermore, the anchoring hardware and threaded rebar must be left stationary until the grout hardens. Furthermore, tightening the lock nut requires a large working environment and special tools, making the process of tightening the lock nut cumbersome.

[0006] Therefore, a technical problem has arisen that must be solved in order to provide a reinforcing bar with an anchoring member that is easy to work with and can be assembled in a short time, and a method for manufacturing the same, and the present invention aims to solve this problem. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, the reinforcing bar with anchoring member of the present invention is a reinforcing bar with anchoring member provided at the end of the reinforcing bar, and while at least one end is exposed, the other end side is cast-in and fixed to the anchoring member, and the one end is provided with an intermediate shaft member joined to the end of the reinforcing bar.

[0008] In addition, in order to achieve the above-mentioned object, the manufacturing method of a reinforcing bar with an anchoring member according to the present invention is a manufacturing method of a reinforcing bar with an anchoring member provided at the end of the reinforcing bar, and includes a step of casting-inserting and fixing the other end side of the intermediate shaft member into the anchoring member while leaving at least one end of the intermediate shaft member exposed, and a step of joining the end of the reinforcing bar to one end of the intermediate shaft member. [Effects of the Invention]

[0009] The present invention allows reinforcing bars with anchoring members to be assembled easily and in a short time. [Brief explanation of the drawings]

[0010] [Figure 1] Schematic diagram showing the steps of a method for manufacturing a reinforcing bar with an anchoring member according to one embodiment of the present invention. [Figure 2] Schematic diagram showing the state in which a reinforcing bar with an anchoring member is restraining a restrained reinforcing bar. [Figure 3] 10A to 10C are right side views showing various modified examples of the fixing member. [Figure 4] 10A and 10B are a left side view and a front view showing a modified example of a reinforcing bar with an anchoring member. [Figure 5] 10A and 10B are left side and front views showing another modified example of a reinforcing bar with an anchoring member. DETAILED DESCRIPTION OF THE INVENTION

[0011] An embodiment of the present invention will be described with reference to the drawings. Note that, hereinafter, when referring to the number, numerical value, amount, range, etc. of components, unless otherwise specified or when it is clearly limited to a specific number in principle, the number is not limited to the specific number, and may be more or less than the specific number.

[0012] Furthermore, when referring to the shape or positional relationship of components, etc., it includes things that are substantially similar or approximate to those shapes, etc., unless otherwise specified or when it is clearly considered otherwise in principle.

[0013] In addition, in the drawings, characteristic parts may be exaggerated or some components may be omitted in order to make the features easier to understand.

[0014] Furthermore, the order of the steps constituting this embodiment is not limited to the following order, unless otherwise specified or obvious in principle, and multiple steps may be executed in parallel.

[0015] FIG. 1 is a schematic diagram showing a procedure for manufacturing a reinforcing bar 1 with anchoring members according to one embodiment of the present invention.

[0016] First, as shown in the front view of FIG. 1(a) and the right side view of FIG. 1(b), with one end of the intermediate shaft member 2 partially exposed, the fixing member 3 is fixed to the other end of the intermediate shaft member 2.

[0017] The intermediate shaft member 2 is a steel material with an uneven surface, for example, a deformed steel bar with protrusions 21 such as bamboo knots or screw knots formed on the surface along the axial direction. The protrusions 21 of the intermediate shaft member 2 engage with the anchoring member 3, making it possible to resist an external force that would pull the intermediate shaft member 2 out of the anchoring member 3. The intermediate shaft member 2 is preferably made of the same type of steel as the reinforcing bar 4 described below. The intermediate shaft member 2 is a reinforcing bar that is shorter than the reinforcing bar 4, and may be scrap material generated when the reinforcing bar 4 is cut.

[0018] The anchoring member 3 is a casting made of relatively inexpensive cast iron or cast steel, etc., and cast-inserts the other end of the intermediate shaft 2. The cast anchoring member 3 can be produced in any shape at low cost. Here, "cast-insert" refers to the process of producing the cast anchoring member 3 by placing the intermediate shaft 2 at a predetermined position in a mold, filling the gap between the mold and the intermediate shaft 2 with molten iron, solidifying and cooling the molten iron, and then breaking the mold to remove the anchoring member 3, thereby integrating the intermediate shaft 2 with the anchoring member 3.

[0019] The anchoring member 3 is formed in the shape of a square plate with a substantially uniform thickness over its entire surface. The intermediate shaft member 2 is disposed at a position eccentric above the center of the anchoring member 3, specifically at a position where the hooking distance D from the intermediate shaft member 2 to the lower end of the anchoring member 3 is ¾ or more of the outer diameter of the restrained rebar 6 (described later). The other end of the intermediate shaft member 2 may be exposed on the surface of the anchoring member 3, or there may be a small gap between the surface of the anchoring member 3 and the other end of the intermediate shaft member 2.

[0020] Next, as shown in FIG. 1(c), one end of the intermediate shaft member 2 is joined to the end of the reinforcing bar 4 by friction welding. The reinforcing bar 4 is a deformed steel bar with protrusions 41, such as bamboo knots or screw knots, formed on its surface along the axial direction. The reinforcing bar 4 is made of a steel material such as a deformed steel bar specified in JIS G3112. Note that the joining method between the intermediate shaft member 2 and the reinforcing bar 4 is not limited to friction welding.

[0021] Friction welding of the intermediate shaft member 2 and the reinforcing bar 4 is performed by a known method, for example, by rotatably gripping the outer periphery of the anchoring member 3, bringing the tip of the reinforcing bar 4 arranged approximately coaxially with the intermediate shaft member 2 into contact with one end of the intermediate shaft member 2 rotating at high speed, and heating the tip of the reinforcing bar 4 by friction heat generated by friction between the intermediate shaft member 2 and the reinforcing bar 4, thereby significantly reducing the plastic deformation resistance. Then, by pressing the tip of the reinforcing bar 4 heated by the friction heat against the intermediate shaft member 2, a joint 5 is formed between the intermediate shaft member 2 and the reinforcing bar 4, and the reinforcing bar 4 is joined to the intermediate shaft member 2.

[0022] In this way, the intermediate shaft member 2 and the reinforcing bar 4, which are made of the same type of steel, are friction-joined, allowing the intermediate shaft member 2 and the reinforcing bar 4 to be joined easily in a short amount of time, and exhibiting a higher joining strength than when joining different materials together.

[0023] When such a reinforcing bar 1 with an anchoring member is applied to a concrete structure, as shown in Figure 2, the lower part of the anchoring member 3 is hooked onto the restrained reinforcing bar 6 at the tip side of the reinforcing bar 4, and the reinforcing bar 1 with the anchoring member is fixed to the concrete.

[0024] In this way, the reinforcing bar 1 with anchoring member of this embodiment is a reinforcing bar 1 with anchoring member 3 provided at the end of the reinforcing bar 4, and is configured so that at least one end is exposed and the other end side is cast-in and fixed to the anchoring member 3, and one end is joined to the end of the reinforcing bar 4, and is equipped with an intermediate shaft member 2.

[0025] With this configuration, the anchoring member 3 is cast-in and fixed to the intermediate shaft member 2, eliminating the need for complicated work such as grout filling and lock nut tightening to improve the threaded strength between the threaded reinforcing bar and the anchoring hardware, as was previously required, and therefore the reinforcing bar 1 with anchoring member can be assembled easily and in a short amount of time.

[0026] Moreover, the reinforcing bar 1 with anchoring members according to this embodiment is configured such that the intermediate shaft member 2 is fixed to the anchoring member 3 at a position eccentric from the center of the anchoring member 3.

[0027] With this configuration, the hooking distance D from the intermediate shaft member 2 to the lower end of the anchoring member 3 is ensured to be long, so that the anchoring member 3 can be prevented from coming off the restrained reinforcing bar 6.

[0028] In addition, the manufacturing method of the reinforcing bar 1 with an anchoring member according to this embodiment is a manufacturing method of the reinforcing bar 1 with an anchoring member 3 provided at the end of the reinforcing bar 4, and includes a process of casting-inserting and fixing the other end side of the intermediate shaft member 2 into the anchoring member 3 while leaving at least one end of the intermediate shaft member 2 exposed, and a process of joining the end of the reinforcing bar 4 to one end of the intermediate shaft member 2.

[0029] With this configuration, the anchoring member 3 is cast-in and fixed to the intermediate shaft member 2, eliminating the need for complicated work such as grout filling and lock nut tightening to improve the threaded strength between the threaded reinforcing bar and the anchoring hardware, as was previously required, and therefore the reinforcing bar 1 with anchoring member can be assembled easily and in a short amount of time.

[0030] In addition, in the manufacturing method of the reinforcing bar 1 with anchoring members according to this embodiment, the intermediate shaft member 2 is fixed to the anchoring member 3 at a position eccentric from the center of the anchoring member 3.

[0031] With this configuration, the hooking distance D from the intermediate shaft member 2 to the lower end of the anchoring member 3 is ensured to be long, so that the anchoring member 3 can be prevented from coming off the restrained reinforcing bar 6.

[0032] It should be noted that the present invention can be modified and combined in various ways in addition to those described above without departing from the spirit of the present invention, and it goes without saying that the present invention also covers such modifications and combinations.

[0033] The shape of the fixing member 3 when viewed from the side is not limited to the rectangular shape described above, and may be, for example, a rounded rectangular shape with the four corners of the fixing member 3 rounded as shown in Figure 3(a), an approximately triangular shape that gradually narrows from the top to the bottom of the fixing member 3 as shown in Figure 3(b), or an approximately trapezoidal shape that gradually widens from the top to the bottom of the fixing member 3 as shown in Figure 3(c).

[0034] Furthermore, the reinforcing bar 1 with anchoring members is not limited to those having plate-shaped anchoring members 3 of approximately uniform thickness over the entire surface as described above, but may also have anchoring members 3 formed in an approximately L-shape with locally varying thickness, as shown in the left side view of Figure 4(a) and the front view of Figure 4(b).

[0035] The reinforcing bar 1 with an anchoring member shown in Fig. 4 has an anchoring member 3 that includes a base 31 that cast-ins and fixes the intermediate shaft member 2, and a hooking portion 32 that extends downward from the base 31 and hooks onto the restrained reinforcing bar 6. The base 31 extends longer in the axial direction of the intermediate shaft member 2 than the hooking portion 32, and is capable of contacting the intermediate shaft member 2 over a wide area, further preventing the intermediate shaft member 2 from slipping out.

[0036] Furthermore, the reinforcing bar 1 with anchoring member is not limited to the intermediate shaft member 2 being arranged in an eccentric position within the anchoring member 3 as described above, and for example, the intermediate shaft member 2 may be arranged approximately in the center of the anchoring member 3, as shown in the left side view of Figure 5(a) and the front view of Figure 5(b). [Explanation of symbols]

[0037] 1: Reinforced concrete with anchoring members 2: Intermediate shaft member 21: Protrusion (of intermediate shaft member) 3: Fixing member 31: Base 32:Latching part 4: Reinforced concrete 41: (rebar) protrusion 5:Joint part 6: Restrained rebar D:Latching distance

Claims

1. A reinforcing bar with an anchoring member provided at the end of the reinforcing bar, A reinforcing bar with an anchoring member, characterized in that at least one end is exposed while the other end is cast-in and fixed to the anchoring member, and the one end is provided with an intermediate shaft member joined to the end of the reinforcing bar by friction welding.

2. 2. The reinforcing bar with anchoring member according to claim 1, wherein the intermediate shaft member is fixed to the anchoring member at a position eccentric to the center of the anchoring member.

3. 3. The reinforcing bar with anchoring members according to claim 1 or 2, wherein the intermediate shaft member is a deformed steel bar having protrusions formed on its outer circumferential surface.

4. A method for manufacturing a reinforcing bar with an anchoring member, in which an anchoring member is provided at the end of the reinforcing bar, a step of casting-inserting the other end of the intermediate shaft member into the fixing member while leaving at least one end of the intermediate shaft member exposed; a step of joining an end of the reinforcing bar to one end of the intermediate shaft member by friction welding; A method for manufacturing a reinforcing bar with an anchoring member, comprising:

5. The method for manufacturing a reinforcing bar with an anchoring member according to claim 4, characterized in that the intermediate shaft member is fixed to the anchoring member at a position eccentric to the center of the anchoring member.

6. 6. The method for manufacturing a reinforcing bar with an anchoring member according to claim 4 or 5, wherein the intermediate shaft member is a deformed steel bar having protrusions formed on its outer circumferential surface.

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