Auxiliary jig and method for connecting reinforcing bars.

Abstract

To facilitate the connection of two reinforcing bars using mechanical joints. [Solution] The auxiliary jig 10 for connecting reinforcing bars is used when connecting threaded reinforcing bars 1 and 2 using a threaded reinforcing bar joint 3 fitted onto the end of the threaded reinforcing bar 2. The auxiliary jig 10 comprises a jig body 20, a first holding part 30A provided on the jig body 20 for detachably holding the end of the threaded reinforcing bar 1, and a second holding part 30B provided on the jig body 20 opposite the first holding part 30A for detachably holding the end of the threaded reinforcing bar 2. The threaded reinforcing bar 1 held by the first holding part 30A and the threaded reinforcing bar 2 held by the second holding part are positioned on the same straight line.

Description

Technical Field

[0001] The present invention relates to an auxiliary jig used when connecting two reinforcing bars by a mechanical joint, and a method for connecting two reinforcing bars by a mechanical joint.

Background Art

[0002] In the reinforcing bars constituting reinforced concrete, in order to obtain a reinforcing bar of a desired length, a reinforcing bar of a certain length is connected by a reinforcing bar joint. As a conventional example, Patent Document 1 below describes that for two reinforcing bars, misalignment of the axes is absorbed by a guide jig and the bars are connected by a mechanical joint.

[0003] In what is described in Patent Document 1, as shown in FIG. 6, for a threaded bar 1 extending upward from a reinforcing bar unit (not shown), the other threaded bar 2 is aligned above, and the threaded bars 1 and 2 are connected. Prior to connection, as shown in FIG. 6(A), a threaded bar joint 3 is attached as a mechanical joint to the end of the upper threaded bar 2, and a guide jig 4 is attached to the end of the lower threaded bar 1.

[0004] To connect the threaded bars 1 and 2, as shown in FIG. 6(B), the upper threaded bar 2 is lowered, and the threaded bar joint 3 is positioned from the tapered enlarged diameter portion 4a in the guide jig 4 into the cylindrical portion 4b, thereby aligning the axes of the threaded bars 1 and 2. Next, as shown in FIG. 6(C), the threaded bar joint 3 that was screwed onto the upper threaded bar 2 is also screwed onto the lower threaded bar 1 to connect the threaded bars 1 and 2. Finally, as shown in FIG. 6(D), the guide jig 4 is removed from the lower threaded bar 1.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

[0006] In the invention described in Patent Document 1, threaded reinforcing bars 1 and 2, which are not connected, are joined together. As a result, the alignment of the axes of the threaded reinforcing bars 1 and 2 is not stable, making the joining process difficult. The joining process required at least one worker to support the threaded reinforcing bar 2 and another worker to join the threaded reinforcing bars 1 and 2 using the threaded reinforcing bar joint 3. [Means for solving the problem]

[0007] The present invention has been made to solve at least one of the above problems, and an auxiliary jig for connecting reinforcing bars according to one aspect of the present invention is used when connecting two reinforcing bars by a mechanical joint fitted onto one end of either of the two reinforcing bars, The jig body and The jig body is provided with a first holding part that detachably holds one end of the reinforcing bar, The jig body is provided with a second holding part that is opposite to the first holding part and detachably holds the other end of the reinforcing bar, The reinforcing bars held in the first holding section and the reinforcing bars held in the second holding section are positioned on the same straight line.

[0008] According to the above configuration, in order to connect two reinforcing bars, the ends of each reinforcing bar are held by the first and second holding parts of the auxiliary jig, respectively, and the two reinforcing bars are positioned in the same straight line. Next, the mechanical coupling fitted onto the end of one of the reinforcing bars is moved toward the other reinforcing bar, and the ends of the two reinforcing bars are connected by the mechanical coupling. After connection, the auxiliary jig is removed from the two reinforcing bars. The two reinforcing bars can maintain a stable coaxial position by being held by the auxiliary jig, which in turn facilitates the connection of the two reinforcing bars using a mechanical joint. Because the two reinforcing bars are held simultaneously by the auxiliary jig, the connection can be performed without a worker having to support one of the reinforcing bars, potentially reducing the number of personnel required compared to conventional methods. Since each reinforcing bar is detachably held by its respective holding part, the auxiliary jig can be removed after the connection work is completed and reused in another connection work.

[0009] Preferably, at least one of the first holding portion and the second holding portion has a pair of halves that can be combined to surround the reinforcing bar and can be separated in a direction intersecting the axis of the reinforcing bar, and these halves are joined by a hinge so that they can be opened and closed in a direction intersecting the axis. With the above configuration, the reinforcing bars are stably held by being surrounded by a pair of halves, and the attachment and detachment of auxiliary jigs to the reinforcing bars is made easy by opening and closing the halves. This improves the work efficiency of connecting the reinforcing bars.

[0010] Preferably, on the opening and closing sides of the pair of halves, one of the halves has a locking receiving portion, and the other has a locking portion that is detachably locked to the locking receiving portion. The above configuration allows for switching between holding and releasing the closed state of the pair of halves, preventing accidental opening and closing.

[0011] Preferably, each half-body is interchangeably provided with a reinforcing bar receiving portion that extends along the axial direction of the reinforcing bar to be held and is capable of accommodating a portion of the reinforcing bar, and the reinforcing bar is held between a pair of these reinforcing bar receiving portions. According to the above configuration, the pair of rebar support sections enable radial positioning of the reinforcing bars within the pair of halves and prevent axial displacement of the reinforcing bars. By using rebar support sections of a size corresponding to the diameter of the reinforcing bars to be connected, the pair of halves can accommodate reinforcing bars of various diameters.

[0012] Another aspect of the present invention is a method for connecting two reinforcing bars using a mechanical joint, The process involves holding the end of the first reinforcing bar in the first holding portion provided on the jig body of the auxiliary jig, The process involves attaching a mechanical joint to the end of the second reinforcing bar by fitting it onto the outside, The process involves holding the end of the second reinforcing bar in the second holding part provided on the jig body so as to face the first holding part, thereby aligning the second reinforcing bar with the first reinforcing bar held in the first holding part. The process involves moving the above-mentioned mechanical joint toward the above-mentioned first reinforcing bar, thereby connecting the above-mentioned first reinforcing bar and the above-mentioned second reinforcing bar, The process of removing the auxiliary jig by removing the first retaining part and the second retaining part from the end of the first reinforcing bar and the end of the second reinforcing bar, respectively, It is characterized by containing [something].

[0013] According to the above configuration, two reinforcing bars, which are held in a stable coaxial state by an auxiliary jig, are connected by a mechanical joint, making it easy to connect the two reinforcing bars. Since the two reinforcing bars to be connected are held simultaneously by the auxiliary jig, the connection can be performed without a worker having to support one of the reinforcing bars during the connection work, which may reduce the number of personnel required compared to conventional methods. The auxiliary jig, which is removed after the connection work, can be reused in another connection work. [Effects of the Invention]

[0014] According to the present invention, two reinforcing bars can be easily connected using a mechanical joint. [Brief explanation of the drawing]

[0015] [Figure 1] This is a perspective view of an auxiliary jig for connecting reinforcing bars according to one embodiment of the present invention. [Figure 2] This is a front view of the auxiliary jig. [Figure 3](A) It is an enlarged sectional view taken along line III-III of FIG. 2. (B) It is an enlarged sectional view showing the state where a pair of half bodies are opened from the state of FIG. 3(A). [Figure 4] It is an enlarged perspective view of the reinforcing bar receiving part provided inside each half body. [Figure 5] It is an explanatory view showing the process of connecting reinforcing bars using the auxiliary jig. (A) is a view showing the state where the end of one reinforcing bar is held by one holding part of the auxiliary jig. (B) is a view showing the state where the end of the other reinforcing bar to which a mechanical joint is attached is held by the other holding part. (C) is a view showing the state where the mechanical joint is moved toward one reinforcing bar to connect the two reinforcing bars. (D) is a view showing the state where the auxiliary jig is removed. [Figure 6] It is an explanatory view showing the process of connecting reinforcing bars according to the conventional example. (A) is a view of the state where a guide jig is attached to the end of one reinforcing bar and a mechanical joint is attached to the end of the other reinforcing bar prior to connection. (B) is a view of the state where the other reinforcing bar is lowered into the guide jig to align the axes of the two reinforcing bars. (C) is a view showing the state where the mechanical joint is moved toward one reinforcing bar to connect the two reinforcing bars. (D) is a view showing the state where the guide jig is removed.

Embodiments for Carrying Out the Invention

[0016] An embodiment of the present invention will be described with reference to FIGS. 1 to 5. In this embodiment, when another threaded bar 2 is arranged above the threaded bar 1 constituting the main bars of a column reinforcing cage (not shown), and the threaded bars 1 and 2 are connected by a threaded bar joint 3 as a mechanical joint, the present invention is applied. Hereinafter, the auxiliary jig for reinforcing bar connection and the reinforcing bar connection method will be described in order.

[0017] [Auxiliary Jig for Reinforcing Bar Connection] The auxiliary jig 10 for connecting reinforcing bars (hereinafter referred to as the auxiliary jig) will be described with reference to Figures 1 to 5. As shown in Figure 5, the auxiliary jig 10 assists in connecting two threaded reinforcing bars 1 and 2 (the first reinforcing bar and the second reinforcing bar) using a threaded reinforcing bar joint 3 (a mechanical joint) that is fitted onto either end of the two threaded reinforcing bars 1 and 2, by holding the threaded reinforcing bars 1 and 2 and connecting them.

[0018] As shown in Figures 1 and 2, the auxiliary jig 10 mainly consists of a jig body 20, a first holding part 30A provided on the jig body 20 that holds one end of the two threaded reinforcing bars 1 and 2, and a second holding part 30B provided on the jig body 20 that holds the other end.

[0019] The jig body 20 is a member that extends linearly and supports the first and second holding parts 30A and 30B facing each other. In this embodiment, it is made of metal and, as shown in Figure 3, is constructed of a C-shaped steel with a C-shaped cross-section.

[0020] The back plate portion 21 of the jig body 20 is provided with connecting blocks 22 for supporting the first and second holding portions 30A and 30B. In this embodiment, two connecting blocks 22 are arranged for each of the first holding portion 30A and the second holding portion 30B. The connecting blocks 22 are fixed to the back plate portion 21 and may be fixed by welding.

[0021] As shown in Figure 5, the first holding part 30A in this embodiment holds the threaded reinforcing bar 1 and has a pair of split bodies 40A and 50A that can be combined to surround the threaded reinforcing bar 1 and can be separated in a direction intersecting the axis of the threaded reinforcing bar 1, as shown in Figures 1 and 3. These split bodies 40A and 50A are joined by a hinge 31A and can be opened and closed.

[0022] In this embodiment, as shown in Figures 1 to 3, one of the halves 40A is a metal plate extending along the longitudinal direction of the jig body 20 and is bent to form an L-shape in side view. The halves 40A has a first plate portion 41A and a second plate portion 42A that are approximately perpendicular to each other. The first plate portion 41A is fixed to the connecting block 22 on the first holding portion 30A side. The first plate portion 41A may be welded to the connecting block 22.

[0023] The other half-piece 50A, as shown in Figures 1 to 3, is a metal plate extending along the longitudinal direction of the jig body 20, and is bent to form a Z shape in side view, and has a first plate portion 51A, a second plate portion 52A, and a third plate portion 53A. The first plate portion 51A is attached to one end of the second plate portion 52A in the short direction at approximately a right angle, and the third plate portion 53A is attached to the other end of the second plate portion 52A at approximately a right angle, bent to the opposite side from the first plate portion 51A.

[0024] As shown in Figures 1 and 3, the first plate portion 41A of the split body 40A and the first plate portion 51A of the split body 50A are joined by a hinge 31A, and the split bodies 40A and 50A can be opened and closed in a direction perpendicular to the axis of the threaded reinforcing bar 1. When opening and closing the split bodies 40A and 50A, the side of the second plate portion 42A of the split body 40A opposite to the first plate portion 41A, and the side of the second plate portion 52A of the split body 50A opposite to the first plate portion 51A are opened and closed.

[0025] On the opening and closing sides of the split bodies 40A and 50A, the second plate portion 42A of the split body 40A and the third plate portion 53A of the split body 50A are provided with a locking portion 32A and a locking receiving portion 33A, respectively.

[0026] As shown in Figures 1 and 3, the locking receiving portion 33A is positioned on the side of the third plate portion 53A opposite to the first and second plate portions 51A and 52A. In the side view shown in Figure 3, the locking receiving portion 33A is a J-shaped metal fitting with the side opposite to the second plate portion 52A open, and has a hook-shaped projection 34A at its tip. The locking receiving portion 33A may be welded to the third plate portion 53A.

[0027] The locking portion 32A has a base portion 35A provided on the outside of the second plate portion 42A, a pair of arm portions 36A, 36A extending from the base portion 35A along the plate surface of the second plate portion 42A in the opposite direction to the first plate portion 41A, and a connecting portion 37A that connects the arm portions 36A, 36A.

[0028] Each arm 36A is biased toward the base 35A and is extendable or movable in the longitudinal direction. As a result, the connecting portion 37A is detachably locked onto the hook-shaped projection 34A of the locking receiving portion 33A. Each arm 36A may be formed to allow the extended state or movable position to be fixed and released.

[0029] The locking portion 32A is detachably locked to the locking receiving portion 33A, which allows switching between holding and releasing the closed state of the pair of split bodies 40A and 50A, thereby preventing accidental opening and closing of the split bodies 40A and 50A. Alternatively, the locking portion 32A may be provided on the split body 50A and the locking receiving portion 33A on the split body 40A.

[0030] As shown in Figures 1 and 3, a pair of rebar support portions 60, 60 extending along the longitudinal direction of the split bodies 40A and 50A are provided on the inside of the first plate portion 41A and the second plate portion 42A of the split body 40A, and on the inside of the first plate portion 51A and the second plate portion 52A of the split body 50A. The rebar support portions 60, 60 may be replaceable.

[0031] Each rebar support portion 60 has a semi-cylindrical shape, as shown in Figure 4, and has a pair of chamfered portions 61, 61 on its outside. As shown in Figure 3(B), the chamfered portions 61, 61 abut against the first plate portion 41A and the second plate portion 42A, respectively, when attached to the split body 40A, and abut against the first plate portion 51A and the second plate portion 52A, respectively, when attached to the split body 50A. Adhesives, double-sided adhesive tape, etc. can be used to attach the rebar support portions 60, 60 to the split bodies 40A and 50A, and the rebar support portions 60, 60 may be designed to be removable from the split bodies 40A and 50A.

[0032] As shown in Figure 4, each rebar support portion 60 has a curved surface portion 62 on its inside, and a portion of the threaded reinforcing bar 1 can be accommodated in the curved surface portion 62. As shown in Figure 3(A), when the split bodies 40A and 50A are closed, the threaded reinforcing bar 1 is held between the pair of rebar support portions 60 and 60 while in contact with the curved surfaces 62 and 62. This positions the threaded reinforcing bar 1 radially within the split bodies 40A and 50A.

[0033] Each rebar support portion 60 is made of resin, elastomer, etc., and a rubber sheet (not shown) may be attached to the curved portion 62 of the rebar support portion 60 made of resin. The pair of rebar support portions 60, 60 hold the threaded rebar 1 in a state where its axial position can be finely adjusted. This makes it possible to adjust the distance between the threaded rebars 1 and 2 to match their thread pitches, and ultimately make it possible to connect the threaded rebars 1 and 2.

[0034] By making the size of the pair of rebar receiving sections 60, 60 correspond to the diameter size of the threaded rebar 1, the pair of split sections 40A, 50A can accommodate the holding of threaded rebar 1 of various diameter sizes.

[0035] As shown in Figure 5, the second retaining portion 30B in this embodiment holds the threaded reinforcing bar 2 and has the same shape as the first retaining portion 30A, as shown in Figures 1 and 2. Therefore, for the second retaining portion 30B, the same parts as the first retaining portion 30A will be indicated by adding the symbol B to the same number, and their explanation will be omitted.

[0036] As shown in Figures 1 and 2, when the pair of halves 40A and 50A of the first holding part 30A are closed and the pair of halves 40B and 50B of the second holding part 30B are closed, the axis of the space formed by the pair of rebar receiving parts 60, 60 of the first holding part 30A coincides with the axis of the space formed by the pair of rebar receiving parts 60, 60 of the second holding part 30B. Therefore, the threaded reinforcing bar 1 held by the first holding part 30A and the threaded reinforcing bar 2 held by the second holding part 30B are arranged on the same straight line and face each other.

[0037] [Method for connecting reinforcing bars] Next, a method for connecting reinforcing bars using the auxiliary jig 10 described above will be explained with reference to Figure 5. In this method of connecting reinforcing bars, the threaded reinforcing bar 1 of a column reinforcing cage (not shown) and the threaded reinforcing bar 2 positioned above it are held by the auxiliary jig 10, and the threaded reinforcing bars 1 and 2 are connected by a threaded reinforcing bar joint 3.

[0038] First, as shown in Figure 5(A), the end of the threaded reinforcing bar 1 is held in the first holding part 30A of the auxiliary jig 10. Furthermore, a threaded reinforcing bar connector 3 is fitted onto the end of the threaded reinforcing bar 2. The threaded reinforcing bar connector 3 has an internal thread on the inner surface of a sleeve-shaped member that corresponds to the threaded portion of the threaded reinforcing bars 1 and 2, and connects the ends of the threaded reinforcing bars 1 and 2. Before connection, as shown in Figure 5(B), the entire length of the threaded reinforcing bar connector 3 is screwed onto the end of the threaded reinforcing bar 2.

[0039] Next, as shown in Figure 5(B), the end of the threaded reinforcing bar 2 is held by the second holding part 30B of the auxiliary jig 10. This positions the threaded reinforcing bar 2 in the same straight line as the threaded reinforcing bar 1 held by the first holding part 30A.

[0040] Next, as shown in Figure 5(C), the threaded rebar joint 3 is rotated to move toward the threaded rebar 1, and the tip of the threaded rebar joint 3 is screwed onto the end of the threaded rebar 1. This connects the threaded rebars 1 and 2. The threaded rebar joint 3 is rotated until it is screwed halfway into the threaded rebars 1 and 2.

[0041] Next, as shown in Figure 5(D), the first retaining part 30A and the second retaining part 30B are removed from the ends of threaded reinforcing bar 1 and threaded reinforcing bar 2, respectively, and the auxiliary jig 10 is removed. This completes the connection of threaded reinforcing bars 1 and 2. Alternatively, the auxiliary jig 10 may be removed when threaded reinforcing bars 1 and 2 are connected, and then the threaded reinforcing bar joint 3 may be screwed into threaded reinforcing bars 1 and 2, halfway each.

[0042] [Effects of the Embodiment] According to the above embodiment, the threaded reinforcing bars 1 and 2 can maintain a stable coaxial state by being held by the auxiliary jig 10, and consequently, connection by the threaded reinforcing bar joint 3 is facilitated. Since the auxiliary jig 10 holds the threaded reinforcing bars 1 and 2 simultaneously, the threaded reinforcing bar 2 does not need to be supported by a worker during the connection work of the threaded reinforcing bars 1 and 2, which may reduce the number of personnel required compared to conventional methods. By having the first and second holding parts 30A and 30B respectively detachably hold the threaded reinforcing bars 1 and 2, the auxiliary jig 10 can be removed after the connection work and reused in another connection work. The threaded reinforcing bar 1(2) is stably held in place by being surrounded by a pair of halved sections 40A, 50A (40B, 50B). The opening and closing of the halved sections 40A and 50A (40B and 50B) makes it easy to attach and detach the auxiliary jig 10 to the threaded reinforcing bars 1 (2). This improves the work efficiency of connecting the threaded reinforcing bars 1 and 2.

[0043] [Differentiation] It should be noted that the present invention is not limited to the embodiments described above, and various modifications can be adopted without departing from the spirit of the invention. In the above embodiment, the first retaining portion 30A and the second retaining portion 30B have similar shapes, but they may have different shapes. The first holding part 30A may hold the threaded reinforcing bar 2, and the second holding part 30B may hold the threaded reinforcing bar 1. In the above embodiment, a threaded rebar joint 3 was used as the mechanical joint, but it is not limited to this, and a sleeve joint that connects by sliding a sleeve-shaped member in the axial direction may also be used. When a sleeve joint is used, the reinforcing bar may be a threaded rebar, or it may be a deformed rebar having longitudinal ribs and transverse joints, for example. [Industrial applicability]

[0044] The present invention can be applied to an auxiliary jig used when connecting two reinforcing bars with a mechanical joint, and to a method for connecting two reinforcing bars with a mechanical joint. [Explanation of Symbols]

[0045] 1 Threaded reinforcing bar (first reinforcing bar), 2 Threaded reinforcing bar (second reinforcing bar), 3 Threaded reinforcing bar joint (mechanical joint), 10 Auxiliary jig for reinforcing bar connection, 20 Jig body, 21 Back plate, 22 Connecting block, 30A First holding part, 31A Hinge, 32A Locking part, 33A Locking receiving part, 34A Hook-shaped projection, 35A Base, 36A Arm part, 37A Connecting part, 40A Half-split body, 41A First plate part, 42A Second plate part, 50A Half-split body, 51A First plate part, 52A Second plate part, 53A Third plate part, 30B Second holding part, 31B Hinge, 32B Locking part, 33B Locking receiving part, 34B Hook-shaped projection, 35B Base, 36B Arm section, 37B; Connecting section, 40B; Half-split section, 41B; First plate section, 42B; Second plate section, 50B; Half-split section, 51B; First plate section, 52B; Second plate section, 53B; Third plate section, 60; Reinforcement support section, 61; Chamfered section, 62; Curved section

Claims

1. An auxiliary jig for connecting reinforcing bars, used when connecting two reinforcing bars using a mechanical joint fitted to the end of either of the two reinforcing bars, The jig body and The jig body is provided with a first holding part that detachably holds one end of the reinforcing bar, The jig body is provided with a second holding part that is opposite to the first holding part and detachably holds the other end of the reinforcing bar, An auxiliary jig for connecting reinforcing bars, characterized in that the reinforcing bar held in the first holding part and the reinforcing bar held in the second holding part are positioned on the same straight line.

2. A reinforcing bar connecting auxiliary jig according to claim 1, At least one of the first holding part and the second holding part has a pair of halves that can be combined to surround the reinforcing bar and can be separated in a direction intersecting the axis of the reinforcing bar, These halved sections are joined together by hinges so that they can be opened and closed in a direction intersecting the axis, making them an auxiliary jig for connecting reinforcing bars.

3. A reinforcing bar connecting auxiliary jig according to claim 2, An auxiliary jig for tying reinforcing bars, characterized in that, on the opening and closing sides of a pair of the above-mentioned split bodies, one of the split bodies has a locking receiving portion, and the other has a locking portion that is detachably locked to the locking receiving portion.

4. A reinforcing bar connecting auxiliary jig according to claim 2 or 3, Inside each of the above-mentioned split sections, a replaceable rebar receiving section is provided, which extends along the axial direction of the reinforcing bar to be held and is capable of accommodating a portion of the reinforcing bar. The above-mentioned reinforcing bar is held between a pair of above-mentioned reinforcing bar receiving parts, and is characterized by this auxiliary jig for connecting reinforcing bars.

5. A method for connecting two reinforcing bars using a mechanical joint, The process involves holding the end of the first reinforcing bar in the first holding part provided on the jig body of the auxiliary jig, The process involves attaching a mechanical joint to the end of the second reinforcing bar by fitting it onto the outside, The process involves holding the end of the second reinforcing bar in the second holding part provided on the jig body so as to face the first holding part, thereby arranging the second reinforcing bar in the same straight line as the first reinforcing bar held in the first holding part. The process involves moving the above-mentioned mechanical joint toward the above-mentioned first reinforcing bar, thereby connecting the above-mentioned first reinforcing bar and the above-mentioned second reinforcing bar, The process of removing the auxiliary jig by removing the first retaining part and the second retaining part from the end of the first reinforcing bar and the end of the second reinforcing bar, respectively, A method for connecting reinforcing bars, characterized by including [a specific feature].

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