JP6126818B2 - Rebar grip - Google Patents

Description

  The present invention relates to a reinforcing bar grip, and more particularly to an assembling tool for abutting and joining ends of reinforcing bars.

As is well known, when a reinforced concrete structure is constructed with an RC laminated structure or the like, a reinforcing bar as an aggregate embedded in the concrete is used.
Reinforcing bars include column bars used as main bars and band bars joined so as to surround the column bars.

The column reinforcement has a length as designed by adding a reinforcing bar of a predetermined length in the vertical direction.
At the time of addition, the opposing end surfaces of the upper and lower rebars are abutted and aligned, and then the end surfaces are joined together by applying pressure in a state where the periphery of the end surface is heated by a torch flame. .

  It is known to use a pressure welding fixture that fixes the upper and lower reinforcing bars in a state where the opposing end faces are aligned (centered) in order to add the reinforcing bars used for the column reinforcement (for example, Patent Documents). 1).

  Patent Document 1 discloses a pressure contact fixture including a clamp portion that clamps and fixes each reinforcing bar in a state where the end surfaces of the upper reinforcing bar and the lower reinforcing bar are in contact with each other.

JP 05-329639 A

Vertically abut the end faces of the respective rebar work, on upon inserting the distal end of the upper reinforcement for the bottom reinforcing bar which is gripped on one of the clamp portions of the press fastener to the other clamping part of the press fastener rebar It is necessary to sandwich.
FIG. 7 is a view for explaining the above-described upper rebar insertion and clamping work.
In FIG. 7A, after the lower rebar T1 is gripped by the lower clamp portion 100A of the pressure welding fixture 100, as shown in FIG. 7B, the tip of the upper rebar T2 supported by the operator is pressed against the pressure welding fixture. 100 is inserted into the upper clamp portion 100B.

  As shown in FIG. 7C, the upper rebar T2 inserted into the upper clamp portion 100B is aligned with the upper end surface of the lower rebar T1 while being aligned (centered), and then the upper clamp portion 100B. The gripping bolts 101 mounted on the head are tightened and the end faces are gripped while maintaining the alignment.

In such operations, the upper rebar may have a small diameter or a relatively long unit length.
For this reason, depending on the length and the outer diameter, the upper end side may be more likely to swing than the portion held by the operator (state indicated by an arrow in FIG. 7). For this reason, there is a possibility that the insertion of the pressure fixture 100 into the upper clamp 100B becomes unstable due to the deflection.

Also, in order to prevent the end faces from becoming unable to align due to such unstable support, for example, when one worker works, rely on the skill of the worker. There are many.
Therefore, depending on the level of skill, when insertion into the upper clamp part 100B is difficult, assistance by another operator may be required for insertion and alignment.
In particular, it is necessary to share the insertion into the upper clamp part 100B and the tightening work after the insertion by different workers. Thus, when the number of persons engaged in the work increases, problems such as an increase in cost for reinforcing bar joints arise.

  In addition, when the support of the upper rebar T2 becomes unstable, there is a possibility that the position of the end face is shifted if the support of the upper rebar is insufficient when tightening after the end faces are brought into contact with each other.

  An object of the present invention is to perform a simple operation to abut the opposed end surfaces of upper and lower rebars sandwiched between each other in view of the problems in the above-described conventional rebar joining tools, particularly when the support of the rebar becomes unstable. It is possible to provide a reinforcing bar grip having a configuration capable of preventing misalignment between butted end faces.

To this end, the present invention provides a reinforcing bar grip used to position abutted against the end portion to each other when pressed against the ends of the reinforcing bars, each by closing the pair of grip portions A main body comprising a locking plier-type holding tool capable of gripping a reinforcing bar by a grip end, and a grip portion fixed to the grip end of the main body and having a shape capable of surrounding the outer periphery of the reinforcing bar; It is support sections with possible shapes contact at least two points are used the plan view shape facing in the circumferential direction on the outer peripheral surface of the reinforcing bar, the piece portions of the hand is, the reinforcing bar than the other support sections facing In the reinforcing bar grip, the length along the longitudinal direction is increased.

According to the present invention, positioning when abutting the end surface of the other reinforcing bar against the end surface of the one reinforcing bar can be performed only by inserting the reinforcing bar, and the reinforcing bar can be guided to the abutting position. Work can be done without requiring skill or multiple workers.

It is an external view showing an example of a reinforcing bar joining tool according to an embodiment of the present invention. It is a figure for demonstrating the arrangement | positioning relationship of the reinforcing bar with respect to the reinforcing bar joining tool shown in FIG. It is a figure for demonstrating the operation state using the reinforcing bar joining tool shown in FIG. It is a figure which shows the modification regarding the structure of the holding part used for the reinforcing bar joining tool shown in FIG. It is a figure equivalent to FIG. 1 which shows the modification of the reinforcing bar joining tool shown in FIG. It is a figure for demonstrating the operation state using the reinforcing bar joining tool shown in FIG. It is a figure for demonstrating the abutment operation | work of the reinforcement performed at the time of the conventional reinforcement joining.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to embodiments shown in the drawings.
FIG. 1 is an external view showing a reinforcing bar grip 1 according to an embodiment showing a mode for carrying out the present invention.
In the figure, the reinforcing bar grip 1 uses a locking pliers-type holding tool having a function of combining a plier and a vise using the lever principle as a main body 1A.
When the pair of grip portions 1A1 and 1A2 are gripped, the main body 1A is closed at its tip via a lever to which the grip portions 1A1 and 1A2 are connected, as shown in FIG. Can be sandwiched, so-called sandwiching.
Further, when the pair of grip portions 1A1 and 1A2 are opened, the main body 1A is opened as shown in FIG. 1B, and the gripping target object is released.

The configuration of the main body 1A is as follows.
The main body 1A is provided with a gripping and swinging piece 3 having a pin 2 as a fulcrum at the tip of one gripping portion 1A1, and the gripping and swinging piece 3 has a pin 4 as a fulcrum and the tip of the other gripping portion 1A2. Is provided.
A lever 6 having a support pin 5 as a rocking base end is supported on the other gripping portion 1A2, and an adjustment bolt 7 inserted into the rear end of the one gripping portion 1A1 is supported at the rocking end of the lever 6. The tip is touching.

  The adjusting bolt 7 is a member that can adjust the amount of swing of the lever 6 by adjusting the amount of screwing by adjusting the amount and direction of rotation of the rotation operation unit 7A fixed to one end. The lever 6, whose swing amount is adjusted by the adjusting bolt 7, can determine various intervals between the grips by adjusting the opening angle of the other grip 1 </ b> A <b> 2.

  One end of a tension spring 8 hung between the gripping rocking piece 3 and one gripping part 1A1 is hooked. The tension spring 8 is a member that gives a habit of constantly pulling the grip rocking piece 3 and separating the other grip portion 1A2 from the one grip portion 1A1 to open the tips of the grip portions.

  The other grip 1 </ b> A <b> 2 is provided with a pin 10 positioned at the rocking base end of the grip release lever 9. The grip release lever 9 has an oscillating end protruding outward from the rear end of the other gripping portion 1A2, and by operating this, it receives a reaction force when the lever 6 in the clamping state is pushed and moved, It is a member that releases the gripping state by moving the grip portion 1A2 away from the one grip portion 1A1.

The features of this embodiment will be described as follows for the main body 1A having such a configuration.
A feature of this embodiment is that a grip portion having a shape capable of surrounding the outer periphery of the reinforcing bar is provided at the tips of the grip portions, and the grip portion has a shape capable of contacting at least two locations facing each other in the circumferential direction of the reinforcing bar. The length of the reinforcing bar in the longitudinal direction is longer than that of the other piece.

Hereinafter, this configuration will be described.
FIG. 1 shows an example of the grip portion. The grip portion 11 shown in FIG. 1 uses pieces 11A and 11B that are fixed to the respective ends of one grip portion 1A1 and the other grip portion 1A2 by welding or the like and have a substantially V-shaped plan view. Yes.

  Among the pieces 11A, 11B, the piece 11A on the side of one grip 1A1 has a length along the longitudinal direction of the reinforcing bar (the length indicated by the symbol L1 in FIG. 1), and the other handle 1A2. It is made longer than the side piece 11B (the length indicated by the symbol L2 in FIG. 1).

  The longer piece 11A corresponds to the receiving side of a reinforcing bar loaded between the pieces. That is, one grip part 1A1 side is located on the side where the palm is applied instead of the fingertip when the main body 1A is gripped. It is used as a part that makes it easier to support stably by increasing the length received when receiving the reinforcing bars loaded in between.

Longer fragment portions 11A has a length along the longitudinal direction of the reinforcing bar, the position of the abutted end surface of the reinforcing bar are extended with a same length in the longitudinal direction on both sides of the reinforcing bar as reference, the fragment portions 11A Oh Ru made to have a length which length of contact is substantially the same in both rebar together.

On the other hand, the piece 11B having a shorter length than the piece 11A is welded and fixed to the gripping rocking piece 3 at one end thereof . The position of the end surface of the one end side of the longitudinal direction of the reinforcing bar is aligned with the piece part 11A and the piece part 11B. Piece portion 11B is shorter than the length of the fragment portions 11A towards have long, and are longer than half the length of the fragment portions 11A. And the fixed position of the holding | grip rocking | fluctuation piece 3 in the piece part 11B exists in the range of the length of the longer piece part 11A.

Shorter fragment portions 11B may be in a longer piece portion 11A to pair toward forming an insertion guide portion of the reinforcing bars. That is, when the grip portions 1A1 and 1A2 are gripped and the pieces 11A and 11B of the grip portion 11 are closed, the range where both the pieces 11A and 11B are opposed to each other becomes a substantially cylindrical shape that can surround the reinforcing bar. Functions as a guide that can insert a reinforcing bar. That is, the shorter piece 11B has such a length that the vicinity of the end faces of both reinforcing bars can be in contact with each other along the longitudinal direction of the reinforcing bars with reference to the end face against which the reinforcing bars are abutted.

FIG. 2 is a diagram for explaining a case where reinforcing bars are loaded into the main body 1A.
In FIG. 2 (A), one reinforcing bar T is loaded between the pieces 11A and 11B of the holding part 11 which are open to each other. At this time, the reinforcing bar loaded by the one piece 11A is received.

FIG. 2 (B) shows a state in which the grip portion 1A1, 1A2 of the main body 1A is gripped and the grip portion 11 is closed after one of the reinforcing bars T is loaded.
In this state, portions of the longer piece portion 11A for use in the grip portion 11 and the shorter piece portion 11B faces have a substantially cylindrical shape, each strip portions 11A, 11B is in the shape of its In other words, they are in contact with each other in at least two locations facing each other in the circumferential direction on the outer peripheral surface of the loaded reinforcing bar T.

Since the portion of the space between the opposing portions 11A and 11B is a guide portion for inserting the other reinforcing bar T ′ , the other reinforcing bar T ′ is inserted into the space.

FIG. 2C shows a state in which both reinforcing bars T and T ′ are loaded.
Both rebars T and T ′ loaded in each piece 11A and 11B are in contact with two places facing each other in the circumferential direction in a state where the outer circumference is surrounded by two places in contact with each piece. It is caught in the state. This prevents the end surfaces of the reinforcing bars from shifting.

Since the present embodiment is configured as described above, the operation shown in FIG. 3 is performed during the work.
FIG. 3 is a diagram illustrating an operation in the end face abutting work between the reinforcing bars.
3A, when the lower rebar T1 is sandwiched and fixed in the lower clamp portion 100A of the pressure contact fixture (for convenience, the reference numeral 100 shown in FIG. 7 ), the outer peripheral surface near the upper end surface is , And sandwiched by the main body 1A of the reinforcing bar grip 1.
At this time, as shown in FIG. 3 (B), the long piece 11A among the pieces used for the grip 11 of the rebar grip 1 contacts from the back side of the lower rebar T1 in FIG. 3 (B). The piece 11B contacts the front side of the lower reinforcing bar T1. Thereby, the lower rebar T1 is in a state where four places are sandwiched in the circumferential direction of the outer peripheral surface.

Since the lower rebar T1 is sandwiched, a space serving as a guide portion when the upper rebar T2 is inserted is formed between the one part of the grip portion 11, and the upper rebar T2 is inserted toward the space.
At this time, even when the opposing spacing between the clamp portions 100A and 100B on the upper and lower sides of the pressure contact fixture 100 is wide, a guide portion capable of inserting the upper rebar T2 exists between the clamp portions 100A and 100B. become. For this reason, the upper rebar T2 inserted into the upper clamp portion 100B can quickly enter the grip portion 11 of the main body 1A.

  Accordingly, even when the upper rebar T2 is likely to swing somewhat before being sandwiched by the upper clamp portion 100B, it is possible to abut against the end surface of the lower rebar T1 only by inserting the upper rebar T2 toward the grip portion 11. Become. And since the holding part 11 itself is maintaining the closed state, the position of the end surface of the upper rebar T2 abutted against the lower rebar T1 does not shift.

As described above, since the grip 11 for guiding the abutment between the end surface of the upper rebar T2 and the end surface of the lower rebar T1 is provided, the upper rebar T2 is not held and supported for a long time.
As a result, there is no longer a long-lasting support system for preventing the occurrence of vibration such as a small diameter or relatively long rebar. As a result, the abutting and positioning between the end faces can be accurately performed by one operator without requiring skill in the abutting and positioning between the end faces.

  Thereafter, as shown in FIG. 3 (D), the state where the upper and lower reinforcing bars T1 and T2 are inserted into the gripping part 11 can be maintained, so that the positions of the end faces can be determined when the upper reinforcing bar T2 is sandwiched between the upper clamp parts 100B. Since there is no misalignment, there is no need to try to avoid misalignment. In this state, the upper rebar T2 can be sandwiched by the upper clamp part 100B.

  In the embodiment described above, the pieces 11A and 11B used for the grip portion 11 are formed as flat surfaces along the longitudinal direction of the reinforcing bars. For example, as shown in FIG. 4, the upper reinforcing bars T2 are inserted. It is possible to facilitate insertion of the upper rebar T2 by forming a side end portion on an inclined surface (indicated by reference numerals 11A1 and 11B1 in FIG. 4 for convenience) and having a funnel shape in a side view. Is also possible.

Next, a modified example of the grip portion will be described.
As shown in Japanese Patent Application Laid-Open No. 2012-110936, the gripping portion shown in FIG. 5 (shown by reference numeral 20 for the sake of convenience), instead of using gas pressure welding using a reducing flame for conventional oxidation prevention, The shape is intended for the case of using a polymer reducing member made of a polymer ring made of polystyrene and a steel ring formed in a cap shape.

That is, as shown in FIG. 6, with the object that the resin cap 150 has a circular shape, the grip portion 20 includes arc-shaped pieces 20 </ b> A and 20 </ b> B including a perfect circle that can surround the outer periphery of the resin cap 150. Has been.

Each piece 20A, 20B has different lengths in the longitudinal direction of the reinforcing bars, as in the case shown in FIG.
The shorter one 20B has a length on the upper surface of the flange 150A of the resin cap 150 at which the pliers 3A of the grip rocking piece 3 located at the tip of the other grip 1A2 are located.
The longer piece 20A is made slightly longer than the shorter piece 20B so that a range facing the shorter piece 20B can be secured as a reinforcing bar guide part. It has become.

In this configuration, the tip butting operation between the reinforcing bars is performed by the procedure shown in FIG.
FIG. 6A shows a state in which the lower rebar T1 is sandwiched between the lower clamp portions 100A of the pressure-fixing fixture 100 as in the case shown in FIG. A resin cap 150 is put on the end face.

  As shown in FIG. 6B, when the resin cap 150 is put on the upper end of the lower reinforcing bar T1, the grip 20 of the reinforcing bar grip 1 is closed so as to sandwich the outer periphery of the resin cap 150.

At this time, each piece 20A, 20B of the gripping part 20 sandwiches the resin cap 150 with the lower end positioned on the upper surface of the flange 150A of the resin cap 150 and also sandwiches the lower rebar T1.
In the grip part 20, a range in which the longer piece 20A and the shorter piece 20B are opposed to each other functions as an insertion guide part for the upper rebar T2.

After the upper rebar T2 is inserted into the upper clamp part 100b of the pressure fixture 100, it is inserted toward the space where the pieces 20A and 20B corresponding to the insertion guide part of the grip part 20 face each other (FIG. 6C). reference).
When the upper rebar T2 inserted into the grip portion 11 is abutted against the upper end surface of the lower rebar T1, the upper clamp portion 100B is tightened so that the opposing end surfaces of the upper and lower rebars T1 and T2 are abutted. It is fixed (see FIG. 6D).

Also in this configuration, as in the configuration shown in FIG. 1, the grip 20 that can guide the end surface of the upper rebar T2 and the end surface of the lower rebar T1 is provided. There is no such thing as holding.
In addition, since the upper and lower rebars T1 and T2 can be maintained in the grip 20, there is no positional displacement between the end faces when the upper rebar T2 is sandwiched between the upper clamp portions 100B. There is no need to be stubborn.

Even in this configuration, for the purpose of facilitating the insertion of the upper rebar, the upper rebar insertion side end surface of each piece 20A, 20B of the grip 20 is widened outward as in the case shown in FIG. It is of course possible to provide an inclined surface.
Moreover, as the planar view shape of the piece parts 11A, 11B and 20A, 20B used for the gripping parts 11, 20 shown in FIGS. 1 and 5, as in the configuration of the above-described embodiment, Not only the arc shape but also a combination of one piece having a V shape and the other piece having an arc shape may be used.

DESCRIPTION OF SYMBOLS 1 Reinforcing bar grip 1A Main body 1A1, 1A2 Grasping part 11 , 20 Holding part 11A, 11B , 20A, 20B Single part 150 Resin cap L1, L2 Length of one part used for holding part T, T ', T1 , T2 Reinforcing bar

Claims (6)

A locking pliers that are used to position the ends of the reinforcing bars against each other when the ends of the reinforcing bars are pressed against each other. The locking pliers can grip the reinforcing bars by the ends of the grips by closing the pair of grips. A body consisting of a mold clamping tool;
A gripping portion fixed to the tip of the gripping portion of the main body and having a shape capable of surrounding the outer periphery of the reinforcing bar,
The gripping part is a piece having a shape that allows the shape in plan view to contact at least two locations facing each other in the circumferential direction on the outer peripheral surface of the reinforcing bar, and one piece is more than the other piece facing each other. A reinforcing bar grip characterized in that a length along a longitudinal direction of the reinforcing bar is increased.   The gripping part is positioned between the clamp parts provided in the pressure welding fixture that can push and move one reinforcing bar toward the other reinforcing bar in a state where the reinforcing bars are clamped when the end surfaces of the reinforcing bars are pressed. The reinforcing bar grip according to claim 1, wherein: 3. The reinforcing bar grip according to claim 1, wherein the grip portion has a substantially V-shape in a plan view or an arc shape including a perfect circle . 4. Among the gripping portions, the one piece having a long length along the longitudinal direction of the reinforcing bar has the same length between the two reinforcing bars as the length in contact with the one piece with reference to the end face against which the reinforcing bar is abutted. The reinforcing bar grip according to any one of claims 1 to 3, wherein the reinforcing bar grip has a length as follows. Among the gripping portion, a short piece portion length along the longitudinal direction of the reinforcing bars, based on the abutted against end faces of the reinforcing bar, the end face neighborhood of both reinforcing bar along the longitudinal direction of the reinforcing bar contact rebar grip according to any one of claims 1 to 4, characterized in that it have a long enough. A gripping rocking piece provided at the tip of the grip on the other piece side and supported by the main body so as to be rockable;
The positions of the end faces on one end side in the longitudinal direction of the reinforcing bars of the one piece and the other piece are aligned,
The grip rocking piece is fixed to the other end of the other piece in the longitudinal direction of the reinforcing bar,
The fixed position of the gripping rocking piece in the other piece is within the length of the longitudinal direction of the reinforcing bar in the one piece . Reinforcement grip as described in one.

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