JP2001003518A - Joint for placing joint and jointing member therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint and jointing members for a placing joint capable of simplifying the coupling work for steel bars, of making it easier to control the number of the parts and members, and of restricting the occurrence of troubles such as a shortage of parts. SOLUTION: A first male threaded portion 3 is connected to the end portion of a first steel bar 1 by frictional pressure welding, a bur at the side of the first male threaded portion 3, which is formed outwardly in radial direction at the pressure welding portion is formed to a flat shape as a seat surface 11 almost perpendicular to the axis direction, a coupler 5 is screwed to the first male threaded portion 3, an end face 10 of the coupler 5 is bonded under pressure to the seat surface 11 of the bur 6 and, by its reaction, the first steel bar 1 and the coupler 5 are connected together. In this state, the steel bar is shipped to a precast factory and concrete is poured. Thereafter, the precast member is carried to and installed on the job site and the second male threaded portion 4 is screwed to the coupler 5 and bonded together under pressure thereby connecting together both steel bars 1, 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of joints for joints and joint members for joints used when connecting reinforcing bars at construction sites of buildings and the like, and particularly, the workability of joint work. For those who have improved.

[0002]

2. Description of the Related Art A conventional joint for joining will be described with reference to FIG. FIG. 7A is a partial cross-sectional view showing a state of an embedding side before concrete placing, FIG. 7B is a partial cross-sectional view of a state in which a lock nut on a connecting side is retracted after concrete placing, (c) is a partial cross-sectional view showing a state where both rebars are connected by a joint for joining. First, in FIG. 7C, reference numerals 51 and 52 denote rebars to be connected.
Male screw portions 53 and 54 are pressed against one ends of the first and second 52, respectively. Numeral 55 denotes a cylindrical coupler having a female thread inside, and the female thread of the coupler 55 is
The two rebars 51, 54 are screwed into the male screw portions 53, 54 of the first and second 52, and the lock nuts 56, 57 screwed to the respective male screw portions 53, 54 are pressed against the coupler 55.
52 are connected. In FIG. 7A, reference numeral 59 denotes a bolt cap having a male screw portion 60, and reference numeral 58 denotes a flat mold having a through hole corresponding to the diameter of the male screw portion 60 of the bolt cap 59. These are used to position reinforcing bars before concrete is poured, and are used to fix the coupler 5 when placing concrete.
5 is provided to prevent the concrete from flowing into.

Next, a procedure for connecting the reinforcing bar 51 and the reinforcing bar 52 with the joint for connection will be described. First, FIG.
As shown in (a), the external thread 5 of the reinforcing bar 51 on the embedding side is formed.
3, screw the lock nut 56 and the coupler 55 in order,
After the screw thread 53 has been screwed to almost the root, the lock nut 56 and the coupler 55 are crimped with a specified torque using a tool with a measuring instrument such as a torque wrench. Then, in this state, it is carried into the precast factory. Then, a mold 58 is arranged on the end face of the coupler 55, and the mold 5
The male screw portion 60 of the bolt cap 59 is inserted through the through hole 8 and screwed and fixed to the coupler 55. Next, in this state, after the concrete is poured to the formwork 58, the bolt cap 59 and the formwork 58 are removed while the concrete is solidified. On the other hand, at the construction site, a lock nut 57 is screwed into the second male screw portion 54 of the joining-side rebar 52, and is retracted by screwing to almost the root of the male screw portion 54 (see FIG. 7B). Then, the second male screw portion 54 of the connecting-side rebar 52 is screwed into the pre-cast coupler 55 that is carried in and installed, and the screw is screwed to the vicinity of the center of the coupler 55. Then, the lock nut 57 is screwed to follow. Then, it is pressed against the coupler 55 with a specified torque.

[0004]

In such a splicing joint, the above-described series of operations involving screwing and screwing of the coupler 55 and the lock nuts 56 and 57 is very troublesome, and the workability is high. Improvement is eagerly awaited. That is, conventionally, at the stage before the precast, the lock nut 56 is screwed into the male screw portion 53 of the embedding-side reinforcing bar 51, and the male screw portion 5 is screwed.
3, the work of screwing the coupler 55 to the coupler 3 and the crimping of the lock nut 56 to the coupler 55 must be performed. Of the lock nut 57, the male screw portion 54 of the joint side rebar 52 to the coupler 55, the coupler 5 of the lock nut 57
5 and the work of crimping the lock nut 57 to the coupler 55 must be performed, which means that each of these works is complicated.

In addition, since the coupler 55 and the lock nuts 56 and 57 are separate components, component transportation and management of the number of components are complicated, and problems such as shortage of components may occur.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional drawbacks, and has as its object to simplify the work of connecting reinforcing bars, and to facilitate the transfer of parts and the management of the number of parts. It is an object of the present invention to provide a joint for joint and a joint member for joint which are capable of suppressing occurrence of troubles such as a shortage of parts.

[0007]

Therefore, the joint for joining according to the first aspect of the present invention has a first male threaded portion 3 at the tip of the first reinforcing bar 1 on the embedding side, and a second reinforcing bar 2 on the joining side. A second male screw portion 4 is formed at the distal end, and a cylindrical coupler 5 having a female screw portion is screwed into the male screw portion 3 of the first reinforcing bar 1 and concrete is cast in this state. In a joint for joining which enables connection of both rebars 1 and 2 by screwing the second male thread 4 to the coupler 5, the first male thread 3 is connected to the end of the first rebar 1 by friction welding. The first male screw portion 3 side of the burr 6 formed radially outward at the press-contact portion is flattened so as to be substantially orthogonal to the axial direction to form a seating surface 11. The coupler 5 is screwed into the male screw 3 and the end face 10 of the coupler 5 is seated on the burr 6. 1, is crimped by tightening at the specified torque using a torque wrench or the like, is characterized in that for connecting the first reinforcing bar 1 and the coupler 5 by the reaction force.

According to a third aspect of the invention, there is provided a joint member for connecting a first male screw portion 3 to an end of a first reinforcing bar 1 by friction welding, and a burr formed radially outward at the pressed portion. 6 is flattened so as to be substantially perpendicular to the axial direction to form a seating surface 11, and the first male screw portion 3 is formed.
The end face 10 of the coupler 5 is pressed against the seating surface 11 of the burr 6 with a specified torque using a torque wrench or the like, and the first rebar 1 and the coupler 5 are coupled with each other by the reaction force. Is connected.

The joint for splicing according to the first aspect and the third aspect.
In the joint member for jointing, the embedded side reinforcing bar (first reinforcing bar)
After the coupler 5 is screwed into the first male screw portion 3, the coupler 5 can be pressed against the burr 6 and fixed by the reaction force. For this reason, the above-mentioned conventional work can be omitted. In this way, on the embedding side, since the embedding-side reinforcing bar 1 and the coupler 5 can be connected without providing a lock nut, the work involving screwing and screwing of the lock nut becomes unnecessary, and the connection work is performed. Can be simplified. Moreover, if the end face 10 of the coupler 5 is crimped to the bearing surface 11 of the burr 6 formed at the time of performing the friction welding on the first male screw portion 3 side, the burr 6 is shipped to a precast factory or the like. Therefore, it is possible to provide a joint member for joining which is comparable to a conventional joint member using a lock nut. In addition, it is easy to carry out component transport and component count management, and it is possible to suppress occurrence of problems such as component shortage.

Further, in the joint for jointing according to the second aspect, on the joint side, a second male screw portion 4 is connected to an end of the second reinforcing bar 2 by friction welding, and a radially outward portion is provided at the welding portion. The second male screw portion 4 side of the burr 8 formed is flattened so as to be substantially perpendicular to the axial direction to form a seating surface 13, and the second male screw portion 4 is screwed into the coupler 5, It is characterized in that the bearing surface 13 of the burr 8 is pressed against the end surface 12 of the coupler 5 and the second reinforcing bar 2 and the coupler 5 are connected by the reaction force.

According to the joint for connecting according to the second aspect, after the connection on the embedding side is completed, concrete is cast to the position of the tip of the coupler 5 of the reinforcing bar 1 on the embedding side. Then, on the joint side, the second male screw portion 4 of the joint side reinforcing bar 2 (second reinforcing bar) is screwed to the coupler 5 in the same manner as described above, and the flattened bearing surface 13 of the burr 8 is
The end faces 12 of the coupler 5 can be press-bonded with a specified torque using a torque wrench or the like, and fixed by the reaction force, so that the two rebars 1 and 2 can be connected. Thus, the seating surfaces 1 of the burrs 6 and 8 are connected to both the embedded side and the joint side.
The use of 1 and 13 eliminates the conventional two operations, so that the operation involving screwing and screwing of the lock nut is not required at all, and the connection operation can be further simplified.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, specific embodiments of the joint for joint and the joint member for joint of the present invention will be described in detail with reference to the drawings. FIG. 1 is a first embodiment of the present invention, and is a partial cross-sectional view showing a state where rebars are connected by joints for joining. FIG. 2 is a partial cross-sectional view showing a state of the embedding side before concrete casting according to the present invention.

In FIG. 1, reference numeral 1 denotes an embedding side reinforcing bar (first reinforcing bar), 2 denotes a joining side reinforcing bar (second reinforcing bar), and one end of each of the reinforcing bars 1 and 2 is formed of a trapezoidal screw. The two external thread portions 3 and 4 are connected by friction welding. At this time, burrs 6, 7, 8, 9 protruding annularly on the radially outer peripheral side are formed at the press-contact portions connected by the friction press-contact. Reference numeral 5 denotes a cylindrical coupler having a female screw portion corresponding to the male screw portions 3 and 4 therein.

On the embedding side, the first of the burrs 6
The end on the side of the male screw portion 3 is cut or ground so as to be substantially perpendicular to the axial direction, and is flattened to form an annular seating surface 11. The end of the coupler 5 axially facing the seat 11 is also flattened to form the seat 10. And the seating surface 11 of the burr 6 thus processed
Then, the burr 6 and the coupler 5 are connected by crimping the end face 10 of the coupler 5 and fixing it by the reaction force. In the embodiment shown in the figures, the annular both seating surfaces 10 and 11 are sufficiently wide so as to be located radially outward of the valley of the female screw portion of the coupler 5 so as to function as a crimping surface. However, from a functional point of view, it is sufficient if the coupler 5 is located radially outward of the ridge of the female screw portion of the coupler 5.

In the first embodiment, as shown in FIG. 1, the burr 8 on the side of the second external thread 4 is also used as a crimping means on the joint side, and the same processing as on the embedding side is performed. ing. That is, the end face of the coupler 5 and the surface of the burr 8 on the side of the second male screw portion 4 facing the axial direction are flattened in advance, and the annular seating surfaces 12 and 1 are formed.
3 are formed.

A procedure for connecting the embedding side reinforcing bar 1 and the joining side reinforcing bar 2 will be described. First, at each manufacturing plant, the coupler 5 is screwed into the male screw portion 3 of the reinforcing bar 1 on the embedding side, and this is screwed up to the burr 6, so that the seating surface 1 of the burr 6 is formed.
1, by pressing the end face 10 of the coupler 5 with a specified torque using a tool with a measuring instrument such as a torque wrench, and fixing the end face 10 with the reaction force (reaction force 1 in FIG. 2). And the coupler 5 are connected. The first reinforcing bar 1 and the coupler 5 constitute a joint member for joining, and are shipped to a precast factory in this state.

Next, in a precast factory, a mold 19 is arranged on the tip side of the coupler 5, and the male screw portion 21 of the bolt cap 20 is inserted through a through hole of the mold 19,
It is screwed and fixed to the coupler 5 (see FIG. 2). Then, in this state, after the concrete is poured to the form 19, the bolt cap 20 and the form 19 are removed in a state where the concrete is solidified, and a precast is manufactured. Then, at the construction site where the precast was carried in and installed, the coupler 5
Is screwed until the burr 8 on the side of the second male screw 4 reaches the tip of the coupler 5, and further, the end face 12 of the coupler 5 is attached to the seating surface of the burr 8. 13 is crimped with a prescribed torque using a torque wrench or the like, and fixed by the reaction force (reaction force 2 in FIG. 1). This completes the connection between the reinforcing bars 1 and 2.

As described above, in the case of the first embodiment, since both rebars 1 and 2 can be connected without providing lock nuts at both ends of the coupler 5 as in the related art, the screwing and the screwing of the lock nuts are performed. The operation involving the advance is not required, and the connection operation can be simplified. Moreover, even in a crimping structure using a burr 6 whose surface width is not constant in a strict sense,
Since the torque is controlled in the manufacturing plant, it is possible to provide a joint member for joining which is comparable to a conventional joint member using a lock nut. In addition, it is easy to carry out component transfer and component count management, and it is possible to suppress occurrence of problems such as shortage of components at a construction site.

FIG. 3 shows a second embodiment of the joint for joining. This uses the distal end surfaces of both male screw portions 3 and 4 as seating surfaces 14 and 15 as crimping means when connecting the joining side reinforcing bar 2 to the embedding side reinforcing bar 1. At this time,
The length of the first and second male screw portions 3, 4 when they are brought into close contact in the axial direction is configured to be longer than the axial length of the coupler 5. Since other structures are almost the same as those of the first embodiment, the same parts are denoted by the same reference numerals and the description is omitted. In this embodiment, the second male screw portion 4 of the connection side rebar 2 is screwed into the coupler 5 and the seating surfaces 14 and 15 of the both male screw portions 3 and 4 are press-fitted, thereby fixing with the reaction force. (Reaction 3 in FIG. 3)
2 are connected. In this way, by using the reaction force due to the crimping of the two male screw portions 3 and 4, it is possible to connect the two rebars 1 and 2.

FIG. 4A shows a third embodiment. This uses a burr 9 formed on the joint side rebar 2 side by friction welding as a tightening member, and by cutting or grinding a radially opposed side surface of the burr 9, it is made flat and parallel. It is processed to face each other (Fig. 4
(B)). Since other structures and connection methods are the same as those of the second embodiment, the same portions are denoted by the same reference numerals and description thereof is omitted. By processing the side faces of the burrs 9 facing in the radial direction flat and parallel as described above, a torque wrench or the like can be engaged with the burrs 9. For this reason, the operation of crimping the two male screw portions 3 and 4 with the prescribed torque can be easily performed.

FIG. 5 shows a fourth embodiment. This has a structure in which a lock nut 16 is provided as a crimping means on the second male screw portion 4 of the joining side reinforcing bar 2. Since other structures are almost the same as those of the first embodiment, the same parts are denoted by the same reference numerals and the description is omitted. In this embodiment, the lock nut 16 is screwed into the second male screw portion 4 of the joining side rebar 2, and is retracted by screwing to almost the root of the second male screw portion 4. Then, the second male screw portion 4 is screwed into the coupler 5 and screwed to near the center of the coupler 5, and then the lock nut 16 is screwed to follow the coupler 5.
And fixed by the reaction force (Fig. 5
4), the two rebars 1 and 2 are connected. By using the lock nut 16 only on the joint side rebar 2 in this way, a torque wrench or the like can be engaged with the lock nut 16, so that the work of crimping with a prescribed torque can be easily performed. .

FIG. 6A shows a fifth embodiment. In this embodiment, a tightening plate 17 (see FIG. 6 (b)), which is formed in a substantially hexagonal shape, is provided between the joint side reinforcing bar 2 and the second male screw portion 4, and friction welding is performed in this state. It is of a structure. Further, in the case of this embodiment, the fastening plate 17 is also used as a crimping means for connecting the joining-side reinforcing bar 2 to the embedding-side reinforcing bar 1. At this time, it is assumed that the surface of the tightening plate 17 which faces the coupler 5 in the axial direction is previously flattened so as to form the seat surface 18 so as to be orthogonal to the axial direction. Since other structures are almost the same as those of the first embodiment, the same parts are denoted by the same reference numerals and the description is omitted. In this embodiment, the second male screw portion 4 of the joining side rebar 2 is screwed into the coupler 5 and screwed until the fastening plate 17 integrated with the second male screw portion 4 reaches the tip of the coupler 5. Then, the seating surface 18 of the tightening plate 17 is pressed against the coupler 5 so as to be fixed by the reaction force (reaction force 5 in FIG. 6), and the rebars 1 and 2 are connected.
As described above, between the joint side rebar 2 and the second male screw portion 4,
By providing a substantially hexagonal fastening plate 17 in advance,
Since the connection work can be simplified and a torque wrench or the like can be engaged with the tightening plate 17, the work of crimping the second male screw portion 4 to the coupler 5 with a prescribed torque can be easily performed. it can.

As shown in the first to fifth embodiments, the connection on the embedded side uses a method of crimping the burr and the coupler, so that the conventional work involving screwing and screwing of the lock nut is not required. This is unnecessary, and the connection work can be simplified. Moreover, since the end face 10 of the coupler 5 is pressed against the bearing surface 11 of the burr 6 and shipped to the precast factory, torque control can be performed at the manufacturing factory.
It is possible to provide a joint member for joining which is comparable to a conventional joint member using a lock nut.
Furthermore, it is easy to carry out component transfer and component count management, and it is possible to suppress occurrence of problems such as shortage of components at the construction site. Regarding the connection of the joining side to the embedded side, the above-mentioned crimping means may be selected according to the use at the construction site or the preference of the operator side. The joint member for joining (embedded structure) described above can be used at a construction site without being precast in addition to being used at a precast factory.

[0024]

As described above, in the joint for joining according to the first and third aspects, the first reinforcing bar and the coupler can be connected on the embedding side without providing the lock nut. Therefore, the operation involving screwing and screwing of the lock nut becomes unnecessary, and the connection operation can be simplified. Moreover, if the burr formed at the time of performing the friction welding is shipped to a precast factory or the like with the end face of the coupler pressed against the bearing surface of the first male thread portion side, torque can be controlled at the manufacturing factory. Therefore, it is possible to provide a joint member for joining which is comparable to a conventional joint member using a lock nut. In addition, it is easy to carry out component transport and component count management, and it is possible to suppress occurrence of problems such as component shortage.

[0025] In the joint for joint according to claim 2, the embedding side,
Since the burr seat surfaces are used for both connections on the connection side, there is no need for a conventional operation involving screwing and screwing of the lock nut, and the connection operation can be further simplified.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a first embodiment in a state in which a coupler is stretched over both male screw portions and crimped.

FIG. 2 is a partial cross-sectional view showing a state of an embedding side before concrete casting according to the present embodiment.

FIG. 3 shows a second state in which the coupler is straddled by both male screw portions.
It is a partial sectional view of an embodiment.

FIG. 4A is a partial cross-sectional view of the third embodiment in a state where a coupler is straddled by both male screw portions, and FIG. 4B is a cross-sectional view of a processed burr taken along line AA.

FIG. 5 shows a fourth state in which the coupler is straddled by both male screw portions.
It is a partial sectional view of an embodiment.

FIG. 6A is a partial cross-sectional view of the fifth embodiment in a state where a coupler is straddled by both male screw portions, and FIG. 6B is a cross-sectional view taken along line AA of FIG.

FIG. 7 is a partial cross-sectional view illustrating a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st rebar (embedding side rebar) 2 2nd rebar (joining side rebar) 3 1st external thread part 4 2nd external thread part 5 Coupler 6 Burr 8 Burr 9 Burr 10 End surface 11 Seat surface 12 End surface 13 Seat surface 14 Seat surface 15 Seat 16 Lock nut 17 Tightening plate

Continuation of the front page (72) Inventor Tadao Manabe 13-1 Isojima Minamicho, Hirakata-shi, Osaka F-term in Nippon Catan Co., Ltd. (reference) 2E164 AA02 BA27

Claims (3)

[Claims] A first male thread (3) is provided at the tip of a first reinforcing bar (1) on the embedding side, and a second male thread (4) is provided on the tip of a second reinforcing bar (2) on the splicing side. ), A cylindrical coupler (5) having a female thread inside is screwed into the male thread (3) of the first reinforcing bar (1), and concrete is cast in this state. By screwing the second male screw part (4) to (5), both rebars (1)
In the joint for connection which enables the connection of (2), a first male screw portion (3) is connected to an end of the first reinforcing bar (1) by friction welding, and the pressing portion is radially outward. The first male screw portion (3) side of the formed burr (6) is flattened so as to be substantially perpendicular to the axial direction to form a seating surface (11), and a coupler is attached to the first male screw portion (3). (5) is screwed, the end face (10) of the coupler (5) is pressed against the bearing surface (11) of the burr (6), and the first rebar (1) and the coupler (5) are reacted by the reaction force. And a joint for connection. 2. On the joint side, a second male screw portion (4) is connected to an end of the second reinforcing bar (2) by friction welding, and a burr formed radially outward at the welding portion. The (8) second male screw portion (4) side is flattened so as to be substantially perpendicular to the axial direction to form a seat surface (13), and the coupler (5) is provided with the second male screw portion (4). Screwed together, press-fits the bearing surface (13) of the burr (8) to the end surface (12) of the coupler (5), and connects the second rebar (2) and the coupler (5) by the reaction force. The joint for splicing according to claim 1, wherein: 3. A first male thread of a burr (6) formed by connecting a first male thread portion (3) to an end of the first reinforcing bar (1) by friction welding, and forming a radially outward portion at the pressure welding portion. The part (3) side is flattened so as to be substantially perpendicular to the axial direction to form a seat surface (11), and a coupler (5) is screwed into the first male screw part (3), and the coupler (5) is screwed. 5) End face (1
0) is pressed against the bearing surface (11) of the burr (6), and the first reinforcing bar (1) and the coupler (5) are connected by a reaction force thereof. Element.