JP4727502B2 - Bar joint - Google Patents

Description

  The present invention relates to a bar joint that fastens crossing portions such as reinforcing bars and pipes crossed in a cross shape.

Conventionally, at construction sites, various bars such as reinforcing bars, concrete mold separators, pipes (in the present invention, these are collectively referred to as “bars” regardless of whether they are solid or hollow) are crossed in a cross shape. It is done to install. As a fastening means for these intersecting portions, binding by a number wire, a fitting type utilizing the elastic deformation of the main body made of a synthetic resin or a metal plate (see Patent Documents 1 and 2), and a main body attached to the intersecting portion of the bar material There are types that are tightened with screws (see Patent Documents 3 and 4). These fastening means are appropriately selected in accordance with workability and the bonding strength required for the intersecting portion of the bar.
Japanese Patent Laid-Open No. 2003-253815 JP 2001-164700 A JP 2002-309716 A Utility Model Registration No. 3117115

  The conventional technique of the above-mentioned fitting type has a problem that the coupling strength is low because it depends on the gripping force based on the elasticity of the material, while it can be easily attached to the intersecting portion of the bar. In addition, since all of the conventional techniques of tightening with screws have a structure in which a plurality of screws are used at one intersection, there is room for improvement in terms of workability at the time of fastening.

  The present invention has been made in view of the problems of these prior arts, and its object is to provide a bar joint that has good workability and excellent bonding strength when applied to fastening of intersections of bars. To do.

  In order to solve the above-mentioned problems, in the bar joint according to claim 1 of the present invention, the notches are formed in the side wall at intervals of approximately 90 degrees in the circumferential direction from the opened top surface side to the bottom surface side, and the rod An inner box-like body that accommodates the intersecting portion of the material in the notch, and the notch on the side wall at an interval of approximately 90 degrees in the circumferential direction from the open top surface to the bottom surface outside the inner box-like body An outer box-like body that is formed and has a through-hole formed in the bottom surface, and is inserted from the same direction with the notch portions being substantially coincident with the inner box-like body containing the bar. The other end side engages with the bottom surface of the inner box-shaped body through the through hole of the inner box-shaped body, and the inner box-shaped body is moved to the outer side box in accordance with the rotation operation on one end side protruding from the bottom surface of the outer box-shaped body. Each of the inner box-like bodies is narrowed by being pulled inward while being in sliding contact with the inner surface of the side wall. Material was adopted technical means that includes a fastening member individually clamped allowed to.

Further, in the bar joint according to claim 2, the notches are formed on the side walls at intervals of approximately 90 degrees in the circumferential direction from the opened top surface side to the bottom surface side, and the intersecting portions of the bar materials are formed at the notch portions. An inner box-like body to be housed, a cutout portion is formed on the side wall at an interval of approximately 90 degrees in the circumferential direction from the open top surface side to the bottom surface side outside the inner box-shaped body, and the through holes are formed on the bottom surface An outer box-like body that is formed in the same direction with the notch portions substantially coincided with each other with respect to the inner box-like body that accommodates the bar, and the other is inserted through the through hole of the outer box-like body. The end side engages with the bottom surface of the inner box-shaped body, and the inner box-shaped body is slidably contacted with the inner surface of the side wall of the outer box-shaped body in accordance with the rotation operation on one end side protruding from the bottom surface of the outer box-shaped body. By pulling it inside, the notch of the inner box-like body is narrowed so that the bar located on the top surface side can be clamped With Mel, it was employed technical means of the bar which is located on the bottom side between the cutout portion of the inner box-shaped body clamped the bar and the outer box-like body comprises a fastening member allowed to clamping. In addition, in the invention according to each of the above claims, the side wall outer surface of the inner box-shaped body is formed on an inclined surface narrowing toward the bottom surface side, and the side wall inner surface of the outer box-shaped body is narrowed toward the bottom surface side. It may be formed on the inclined surface.

By employ | adopting the said structure, the following effects can be acquired in the bar-joint tool which concerns on this invention.
(1) By tightening the fastening members such as a set of bolts and nuts, the notches of the inner box-like body that accommodates the intersecting portions of the rods are narrowed so that each rod is clamped. It is good.
(2) At the crossing portion of the bar, each bar is individually sandwiched by the notch of the inner box-like body (Claim 1), or the bar located on the top surface side is notch of the inner box-like body Since the bar located on the bottom surface side is sandwiched between the bar and the cutout part of the outer box-like body (Claim 2), any fastening structure can be used. High bond strength can be realized.

In the present invention, the inner box-like body and the outer box-like body that are nested in the fastened state are not limited to a rectangular parallelepiped shape and various shapes such as a cylindrical shape as long as the top side is open. Applicable. The pair of box-shaped bodies are in a relationship of being reduced and deformed by being pulled into the inner box-shaped body while being in sliding contact with the inner surface of the side wall of the outer box-shaped body as the fastening members such as bolts and nuts are tightened. Then, the individual bars at the intersecting portions are sandwiched independently by the cutouts of the inner box-shaped body narrowed by the reduction deformation, or the bars on the top surface side are sandwiched by the cutouts of the inner box-shaped body In addition, the bar on the bottom side is sandwiched between the bar and the base side of the cutout portion of the outer box-like body. As a specific method for reducing and deforming the inner box-shaped body, for example, it is preferable to form the side walls of the respective box-shaped bodies on an inclined surface that becomes narrower toward the bottom surface side. Based on the competing structure, the notch of the inner box-like body can be easily narrowed, leading to improved workability during fastening. That is, in a box-shaped body having a rectangular parallelepiped basic shape, any box-shaped body has a large quadrangular pyramid-bottomed cylindrical shape on the open top surface which is a bar receiving side, and similarly in a cylindrical box-shaped body It becomes a cylindrical shape with a truncated cone. In addition, it is not necessary that both box-like bodies have a frustum shape as an overall shape.For example, for the inner box-like body, only the peripheral portion on the top surface side is an inclined surface extending outward, and the outer box-like body is a rectangular parallelepiped. There may be. In this case, as the fastening member is tightened, the inclined peripheral portion of the inner box-shaped body comes into contact with the peripheral portion on the top surface side of the outer box-shaped body, thereby narrowing the notch of the inner box-shaped body. It will be. Therefore, the means for reducing and deforming the inner box-like body is not particularly limited. Further, the fastening member may be a set of bolts and nuts, or only a bolt when a screw hole is provided on the bottom surface of the inner box-like body. The shape of each component member is within the technical concept of the present invention. Various modifications can be made.

Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. 1 and 2 are respectively a partially longitudinal front view and a partially longitudinal side view showing a state before fastening when the bar joint according to the present invention is applied to a crossing portion of reinforcing bars. The illustrated bar connector 1 includes an inner box-like body 2, an outer box-like body 3 that is slightly larger than the inner box-like body 2, and a bolt as a fastening member that connects and integrates them on substantially the same axis. 4 and a nut 5.

The inner box-shaped body 2 has a top surface side that is a receiving side thereof opened with respect to the crossing portion of the reinforcing bars R1 and R2 as rods to be joined, and a through-hole 22 is formed at the center of the bottom surface 21, As shown in FIG. 4, the bottom surface has a substantially quadrangular pyramid bottomed cylindrical shape. The four side walls 23 have the same shape on the two surfaces facing each other, and the notches 24 and 25 opened in a letter C shape extending from the top surface side to the bottom surface 21 are provided at the center of each side wall 23. Is provided. That is, the four notches 24, 24, 25, 25 are formed at substantially 90 ° intervals along the circumferential direction of the side wall 23. Here, an arc-shaped recess 24a corresponding to one rebar R1 disposed on the bottom surface 21 side is formed in one notch 24. Further, the other notch 25 is formed with a concave portion 25a having a shape in which both ends are circular and connected by a straight line, and the other rebar R2 is set to be received in the concave portion 25a. Furthermore, by forming a notch 26 at each corner of the bottom surface 21, when the four side walls 23 inclined and opened outward in the state before fastening are tilted inward during fastening and deformed to be reduced, It is comprised so that it may not mutually restrain.

The outer box-shaped body 3 has a substantially quadrangular pyramid-bottomed cylindrical shape similar to the inner box-shaped body 2, has a through hole 32 formed in the center of the bottom surface 31, and two surfaces that are respectively opposed to the four side walls 33. Cutout portions 34 and 35 having the same shape are formed from the top surface side toward the bottom surface 21 side. These notches 34 and 35 are spaced approximately 90 degrees as in the case of the inner box-like body 2, but unlike the notches 24 and 25 in the inner box-like body 2, the longer notch 35 also has a bottom surface 31. It does not reach the bottom surface 31. That is, since the outer box-shaped body 3 needs to accommodate the reinforcing bars R1 and R2 while ensuring strength sufficient to reduce and deform the inner box-shaped body 2, one of the notches 34 has both the reinforcing bar R1 and the reinforcing bar R2. The other notch 35 has a length that can accommodate only the rebar R2 disposed on the top surface side.

The inner box-like body 2 and the outer box-like body 3 are screwed to the projecting end side of the bolts 4 inserted into the respective through holes 22 and 32 from the inside of the inner box-like body 2. The nuts 5 are connected and integrated. The head of the bolt 4 is formed in a quadrangular shape, and is set so that the bolt 4 does not idle in the inner box-like body 2 when the nut 5 is tightened. Note that the head of the bolt 4 can be welded to the bottom surface 21 of the inner box-like body 2, and the idling prevention means may be appropriately selected.

In such a bar joint 1, when the nut 5 is tightened in the state of FIGS. 1 and 2 directed to the intersection of the reinforcing bars R 1 and R 2, as shown in FIGS. 4 is drawn into the inside while sliding on the inclined inner surface of the side wall 33 of the outer box-shaped body 3, and is smoothly reduced and deformed due to the presence of the notches 24 and 25. By this reduction deformation, the notches 24 and 25 of the inner box-like body 2 are narrowed, the rebar R1 closer to the bottom surface 21 is sandwiched between the pair of recesses 24a, and the rebar R2 located on the top surface side is paired with the pair of recesses 25a. In this case, a sufficient bonding strength can be obtained.

Next, a second embodiment of the present invention will be described. The same parts as those in the first embodiment are denoted by the same reference numerals and redundant description is omitted. FIGS. 5 and 6 are a partially longitudinal front view and a partially longitudinal side view showing a state before fastening of the bar joint according to the second embodiment, respectively, and FIGS. 7 and 8 show states after fastening, respectively. It is the partial vertical front view and partial vertical side view which are shown. In the illustrated bar joint 6, the shape of the inner box-like body 7 is different from that of the first embodiment, and the outer box-like body 3 that is the other constituent members, the bolt 4 and the nut 5 as the fastening members are Similar ones are used.

The inner box-like body 7 has a through-hole 72 formed in the bottom surface 71, and the four side walls 73 have the same shape on the two opposing surfaces, and extend from the top surface side to the bottom surface 71. Cutout portions 74 and 75 opened in a C shape are provided. Here, one of the cutouts 74 does not include the concave portion 24a as in the first embodiment on the end face, and the inner box 7 is reduced and deformed to the maximum extent inside the outer box 3 in the fastening state. However, the dimension is set so as not to sandwich the reinforcing bar R1 there. The other notch 75 is formed in the same shape and size as in the first embodiment.

In such a bar joint 6, when the nut 5 is tightened in the state shown in FIGS. 5 and 6 addressed to the intersection of the reinforcing bars R <b> 1 and R <b> 2, as shown in FIGS. 4 is drawn into the inside while slidingly contacting the inclined inner surface of the side wall 33 of the outer box-shaped body 3, and is smoothly reduced and deformed in the same manner as in the first embodiment due to the presence of the notches 74 and 75. By this reduction deformation, the notches 74 and 75 of the inner box-like body 7 are narrowed, but the rebar R 1 closer to the bottom surface 71 is not sandwiched between the end faces of the notches 74. On the other hand, the reinforcing bar R2 located on the top surface side is further pulled by the bolt 4 into the outer box-like body 3 while being sandwiched between the pair of recesses 75a. It is clamped between the bases of the notches 34 of the body 3. Therefore, the crossing portions of the reinforcing bars R1 and R2 can be accurately fastened without being sandwiched individually by the notch portions as in the first embodiment.

FIG. 9 is a partial longitudinal sectional front view showing a state after fastening for a bar joint according to a third embodiment of the present invention. The illustrated bar joint 8 is different from the first embodiment in the inner box-like body and the fastening member. That is, the inner box-like body 9 is not provided with a through hole in the bottom surface 91, and the fastening member is composed of the whole screw bolt 41 and the nut 5 without a head. The whole screw bolt 41 is welded to the back side of the bottom surface 91 at one end side along the axis of the inner box-like body 9, and the nut 5 is screwed to a portion protruding from the through hole 32 of the outer box-like body 3. The And the inner side box-shaped body 9 is comprised so that it may be drawn in the inside of the outer side box-shaped body 3 by rotation operation of the nut 5 similarly to 1st Example.

FIG. 10: is a partial longitudinal cross-sectional front view which shows the principal part of the state before a fastening about the bar-joint tool which concerns on 4th Example of this invention. The bar connector 10 shown in the drawing is different in that the bolts 11 are used in contrast to the above embodiments in which the bar is fastened by rotating the nut 5. In this case, a screw hole 12b is formed in the bottom surface 12a of the inner box-like body 12, and the screw hole 12b and the bolt 11 constitute a fastening member, and the inner box-like body 12 is turned into the outer box-like body by rotating the bolt 11. 3 is drawn inside. A nut may be welded to the inner box-like body 12 instead of the screw hole 12b.

It is a partial longitudinal cross-sectional front view which shows the state before fastening at the time of applying the bar-joint tool which concerns on 1st Example of this invention to the crossing part of a reinforcing bar. It is a partial vertical side view of the state of FIG. It is a partial longitudinal cross-sectional front view which shows the state after the fastening of the bar-joint tool which concerns on 1st Example. FIG. 4 is a partially longitudinal side view of the state of FIG. 3. It is a partial longitudinal front view which shows the state before fastening at the time of applying the bar-joint tool which concerns on 2nd Example of this invention to the crossing part of a reinforcing bar. It is a partial vertical side view of the state of FIG. It is a partial longitudinal cross-sectional front view which shows the state after the fastening of the bar connector which concerns on 2nd Example. It is a partial vertical side view of the state of FIG. It is a partial longitudinal cross-sectional front view which shows the state after the fastening of the bar material coupler which concerns on 3rd Example. It is the partial longitudinal cross-sectional front view which shows the principal part in the state before the fastening of the bar-joint which concerns on 4th Example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,6,8,10 ... Bar material connector, 2, 7, 9, 12 ... Inner box-like body, 3 ... Outer box-like body, 4, 41, 11 ... Bolt, 5 ... Nut, 12a, 21, 71 , 91 ... bottom surface, 22, 32, 72 ... through hole, 23, 33, 73 ... side wall, 24, 25, 34, 35, 74, 75 ... notch, 24a, 25a, 75a ... recess, R1, R2 ... rebar

Claims (3)

  It is a bar joint that fastens bars such as reinforcing bars that intersect in a cross shape at the intersecting portion, and notches are formed on the side walls at intervals of approximately 90 degrees in the circumferential direction from the open top surface side to the bottom surface side. An inner box-like body that accommodates the crossing portion of the bar in the notch, and the notch is spaced approximately 90 degrees in the circumferential direction from the open top surface side to the bottom surface side outside the inner box-like body. The outer box-shaped body is formed in the side wall and the through-hole is formed in the bottom surface, and the outer box-shaped body is inserted from the same direction with the notch portions substantially coincided with the inner box-shaped body containing the bar. Inserting the through-hole of the box-like body, the other end side is engaged with the bottom surface of the inner box-like body, and the inner box-like body is moved along with the rotation operation on one end side protruding from the bottom surface of the outer box-like body. By pulling in the inside while sliding on the inner surface of the side wall of the outer box-shaped body, the notch of the inner box-shaped body is narrowed. Bar connectors, characterized in that it comprises individually clamped allowed to fastening members each bar Te.   It is a bar joint that fastens bars such as reinforcing bars that intersect in a cross shape at the intersecting portion, and notches are formed on the side walls at intervals of approximately 90 degrees in the circumferential direction from the open top surface side to the bottom surface side. An inner box-like body that accommodates the crossing portion of the bar in the notch, and the notch is spaced approximately 90 degrees in the circumferential direction from the open top surface side to the bottom surface side outside the inner box-like body. The outer box-shaped body is formed in the side wall and the through-hole is formed in the bottom surface, and the outer box-shaped body is inserted from the same direction with the notch portions substantially coincided with the inner box-shaped body containing the bar. Inserting the through-hole of the box-like body, the other end side is engaged with the bottom surface of the inner box-like body, and the inner box-like body is moved along with the rotation operation on one end side protruding from the bottom surface of the outer box-like body. By pulling in the inside while sliding on the inner surface of the side wall of the outer box-shaped body, the notch of the inner box-shaped body is narrowed. And a fastening member for holding the bar located on the bottom side between the bar sandwiched by the inner box-shaped body and the cutout portion of the outer box-shaped body. A bar jointer characterized by.   The outer side wall of the inner box-like body is formed on an inclined surface that becomes narrower toward the bottom surface side, and the inner surface of the side wall of the outer box-like body is formed on an inclined surface that becomes narrower toward the bottom surface side. The bar connector according to claim 1 or 2, wherein the bar connector is provided.

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