JP3151714U - Reinforcing tool - Google Patents

Abstract

An operator efficiently and easily binds these intersections without being limited by the arrangement interval of the horizontal bars, the arrangement interval of the horizontal bars and the reinforcing frame, and without being limited by the arrangement form of the main bars. There is provided a reinforcing bar binding tool that can be reliably performed, can maintain a stable binding state with a sufficient binding strength, and can also correct the position of a transverse bar in the binding state. A reinforcing bar binding tool 10 for binding a main bar 1 constituting a reinforcing bar rod and a hoop bar 2 (or a reinforcing ring) that contacts and crosses the main bar 1 and has a length corresponding to the diameter of the main bar 1 and the number of bundles. And a coil spring member 11 that surrounds the outer periphery of the main bar 1, and hook members 12A and 12B that are connected to both ends of the coil spring member 11 and have a substantially U shape that can be hooked on the hoop bar 2 (or the reinforcing ring), It is composed of [Selection] Figure 2

Description

  The present invention relates to a reinforcing bar binding device, and more specifically, a vertical bar (also referred to as a main bar) that constitutes a steel bar for a cast-in-place pile, a horizontal bar (also referred to as a hoop bar) that intersects the vertical bar, and a reinforcing frame ( Reinforcing bar binding tool for bundling and fixing at a crossing portion thereof.

  Conventionally, cast-in-place piles, which are the foundations for earthquake resistance of buildings, have been used to reinforce concrete structures by assembling so-called reinforcing bar rods that are formed in a cylindrical shape by combining a number of reinforcing bars in a grid pattern. ing.

  Such reinforcing bar rods have a large number of main bars arranged at regular intervals in the circumferential central axis direction, a large number of hoop bars circumscribing these main bars at a relatively fine interval, and also to the main bars. It includes a plurality of reinforcing rings (reinforcing frames made of strip-shaped plates) that are inscribed in an intersecting state at relatively rough intervals. And, the intersection between the main bar and the hoop bar is conventionally fixed by iron wire binding or welding, and the intersection between the main bar and the reinforcing frame is also fixed by welding or the like. There has also been proposed a method of fixing the cable with a binding metal fitting.

  FIG. 5 is a perspective view showing a binding metal fitting at the intersection of a main bar and a hoop bar in a reinforcing bar rod disclosed in Patent Document 1 below. FIG. 6 is a diagram for explaining the bundling work using the bundling metal fitting shown in the figure, (a) is a perspective view showing the bundling work process, and (b) shows the completed state of the bundling work. It is a perspective view shown.

  The binding metal fitting 50 is formed by continuously bending a single spring metal wire, and is arranged in parallel so as to face the short first arm 51 formed at one end of the cut metal wire. A long second hanging arm 53, a hanging arch 52 interposed between the first and second hanging arms 51, 53, and a hanging hook 54 formed at the other end of the separation. Yes.

  When using this binding metal fitting 50 to bind the intersection of the main and hoop, as shown in FIG. 6 (a), first, the first hook arm 51 and the long second hook facing the first hook arm 51 are used. A pair of left and right with the hanging arm 53 is temporarily hooked to the hoop muscle 2 from the front, and the winding arch 52 interposed therebetween is traversed so as to be hung inside the main muscle 1.

  In the temporarily fixed state shown in FIG. 6 (a), the hooking hook 54 forming the other end of the spring metal wire is separated from the main bar 1 in a free state, and then the second hooking arm. As shown by an arrow A in FIG. 6A, while gripping 53 as an operating lever, the hook 54 at the tip is forcibly pushed down toward the inner side of the main muscle 1 and the side hook 54 temporarily escapes from the main muscle 1. When the hook 54 is pushed open in the direction, the hook 54 is crossed to the inside of the main muscle 1 and then the operating hand is released, the hook hook 54 is hooked on the main muscle and the mounting is completed.

  FIG. 7 is a perspective view showing a binding metal fitting at the intersection of a main reinforcing bar and a reinforcing ring in a reinforcing bar rod disclosed in Patent Document 2 below. FIG. 8 is a diagram for explaining the bundling work using the bundling metal fitting shown in the figure, (a) is a side view showing the bundling work process, and (b) shows the completed state of the bundling work. FIG.

  The bundling bracket 60 is formed by continuously bending a single spring metal wire, and a short first latching arm 61 formed at one end portion of the bundling bracket 60 is arranged in parallel so as to face this. A long hanging latch 63, a hanging arch 62 interposed between the first and second hanging arms 61, 63, and a hanging hook 64 formed at the other end of the separation. Yes.

  When binding the intersection of the main reinforcing bar and the reinforcing ring using the binding metal fitting 60, first, as shown in FIG. The pair of left and right arms with the two hanging arms 63 are temporarily hooked on the reinforcing ring 3 from the front, and the hanging arch 62 interposed therebetween is crossed in the hanging state behind the main muscle 1 so that the hanging The lower surface 3 a of the reinforcing ring 3 is received by the arch 62.

  In the temporarily fixed state shown in FIG. 8 (a), the hooking hook 64 that forms the other end of the spring metal wire is separated from the main bar 1 in a free state, and then the second hooking arm. While holding 63 as an operating lever, as shown by a chain line in FIG. 8A, while forcibly pushing down toward the main muscle 1 side, the hook 64 at the distal end of the extension is temporarily released in the lateral direction. After pushing open, the hooking hook 64 is crossed to the back of the main muscle 1 and then the operating hand is released, the hooking hook 64 is hooked on the main muscle 1 and the mounting is finished.

  According to such binding metal fittings 50 and 60, the intersection of the main muscle 1 and the hoop muscle 2 and the intersection of the main muscle 1 and the reinforcing ring 3 can be stably and firmly bound in a one-touch operation type. .

  By the way, in recent years, in order to increase the design strength of a building, the amount of reinforcing bars constituting the reinforcing bar is increasing. For example, the distance between the hoop bars and the distance between the reinforcing frame and the hoop bars are narrower than before. For example, the construction method that is designed and the number of main bars is increased, for example, a construction method called so-called tie-bars that are arranged in parallel (bundled) in two (two) in the direction of the center of the reinforcing bar Increasing cases are being conducted.

In such a construction example, when the above-described conventional binding metal fittings 50 and 60 are applied, the following problems occur.
First, in the conventional binding metal fittings 50 and 60, the length L1 of the second hooking arm 53 as the operation lever and the length of the second hooking arm 63 in order to hook the hooking hooks 54 and 64 on the main bar 1. The length L2 needs to be sufficiently secured. However, when the distance between the hoop bars 2 or the distance between the reinforcing ring 3 and the hoop line 2 becomes narrower than the length L1 of the second hook arm 53 and the length L2 of the second hook arm 63, the conventional binding is performed. The metal fittings 50 and 60 cannot be applied as they are.

  In this case, a design change that shortens the lengths of the second hook arm 53 and the second hook arm 63 according to the distance between the hoop bars 2 and the distance between the reinforcing ring 3 and the hoop bars 2 can be considered. If the length of the second hook arm 53 or the second hook arm 63 is shortened, a very large force is required to push the second hook arm 53 or the second hook arm 63 toward the main muscle side. There is a problem that manual installation by a person becomes difficult and workability is significantly lowered.

  In addition, when the above-described bundling bars are used for the arrangement of the main bars constituting the reinforcing bar rod, even if the lengths of the second hook arm 53 and the second hook arm 63 as the operation lever are ensured as usual. If the second hook arm 53 and the second hook arm 63 are not pushed down more than two main bars, the hooks 54 and 64 cannot be hooked on the main bar 1, and in this case also the second hook A very large force is required to push down the arm 53 and the second latching arm 63 toward the main muscle side, and even if the hooking hooks 54 and 64 can be hooked on the main muscle 1, There is a problem that the hanging arm 53 and the second latching arm 63 are bent in the middle, the spring force is lowered, and the intersection cannot be firmly bound.

JP 2004-360456 A JP 2002-81172 A

Means for solving the problems and their effects

  The present invention has been made in view of the above-described problems, and is not limited by the arrangement interval between the horizontal stripes or the arrangement interval between the horizontal stripes and the reinforcing frame (that is, even when these intervals are narrow), and The operator can efficiently and easily perform the bundling operation of these intersecting portions without being limited by the arrangement form of the main bars (that is, the arrangement of the main bars is a single muscle or a bundled muscle). An object of the present invention is to provide a reinforcing bar binding tool that can maintain a stable binding state with sufficient binding strength and that can also correct (correction, fine adjustment, etc.) the position of the transverse muscle in the binding state. It is said.

  In order to achieve the above object, a reinforcing bar binding tool (1) according to the present invention is a reinforcing bar binding tool for binding a vertical bar constituting a reinforcing bar rod and a horizontal bar or a reinforcing frame in contact with the vertical bar. The length is set according to the diameter and the number of bundles of the vertical bars, the coil spring members are surrounded by the outer periphery of the vertical bars, and are attached to both ends of the coil spring members, and can be hooked on the horizontal bars and / or the reinforcing frame. It has a substantially U-shaped latching member.

  According to the reinforcing bar binding tool (1), since the coil spring member is used, one hook attached to one end side of the coil spring member at the intersection of the vertical bar and the horizontal bar or the reinforcing frame. After the member is hooked on the horizontal bar or the reinforcing frame, the other hooking member is surrounded by the outer periphery of the vertical bar while pulling the coil spring member with the other hooking member hooked on the operator's finger. The member can be hooked on the horizontal bar or the reinforcing frame.

  Therefore, without being limited by the arrangement interval between the horizontal stripes or the arrangement interval between the horizontal stripes and the reinforcing frame, that is, even when these intervals are narrow, the vertical stripe and the horizontal stripe or the reinforcing frame In addition, by utilizing the elastic force of the spring, it is possible to correct the position of the horizontal stripes, that is, to correct or finely adjust the distance between the horizontal stripes in the bound state.

  In addition, since the length of the coil spring member is set according to the diameter and the number of bundles of the longitudinal bars, the arrangement of the main bars constituting the reinforcing bar is a single line or a bundle line, Similarly to the above, the operator can efficiently and reliably bind the vertical bars and the horizontal bars or the reinforcing frame, and can maintain a stable binding state with sufficient binding strength.

  Moreover, the reinforcing bar binding tool (2) according to the present invention is the reinforcing bar binding tool (1), wherein the coil spring member is a tension coil spring using a hard steel wire, and the wire diameter is 0.8 to 1.4 mm. And it has the spring constant characteristic of 0.07-1.7N / mm, It is characterized by the above-mentioned.

The spring constant can be expressed by a proportional constant obtained by dividing the load P (N) by the elongation (displacement δ) (mm) when a load is applied to the spring, that is, k = P / δ (N / mm). Indicates a constant.
According to the reinforcing bar binding tool (2), since the coil spring member is composed of a tension coil spring using a hard steel wire, it has excellent durability, and its wire diameter is 0.8 to 1.4 mm, and Since it has a spring constant characteristic of 0.07 to 1.7 N / mm, it can be securely attached with a force that does not impose a burden on the operator, while sufficient bundling using the elastic force (contraction force) of the spring A strong and stable bundling state can be maintained, and both workability and mounting stability can be achieved.

  Moreover, the reinforcing bar binding tool (3) according to the present invention is the reinforcing bar binding tool (1) or (2), wherein the hooking member is a U-shaped part made of a strip-shaped metal plate, and one end of the U-shaped part. The U-shaped portion has a depth of 28 to 60 mm and a width of 14 to 30 mm, and the bent portion includes the coil spring member. An opening is formed in which the end is inserted in a wound state.

  According to the reinforcing bar binding tool (3), the depth of the U-shaped part is set to 28 to 60 mm and the width is set to 14 to 30 mm, so that the operator's finger can be hooked. In addition, it can be hooked to the lap joint portion of the horizontal bar, which is convenient for the operator, and can be hooked without any problem even in the lap joint portion of the horizontal bar. In addition, since the diameter of the transverse muscle generally used is the same as or less than the diameter of the operator's finger, it can be applied even when using transverse muscles with different diameters in one form, It is highly versatile and can reduce manufacturing costs.

It is the perspective view which showed the reinforcing bar binding tool which concerns on embodiment of this invention, (a) is for single muscles, (b) has shown the object for bundling. It is the perspective view which showed the aspect which binds the cross | intersection part of a main muscle (single muscle) and a hoop muscle using the reinforcing bar binding tool which concerns on embodiment, (a) is the figure seen from the inner side of the main muscle, ) Is a view from the outside of the main muscle. BRIEF DESCRIPTION OF THE DRAWINGS It is the perspective view which showed the aspect which binds the cross | intersection part of a main muscle (bundling muscle) and a hoop muscle using the reinforcing bar binding tool which concerns on embodiment, (a) is the figure seen from the inner side of the main muscle, (b) ) Is a view from the outside of the main muscle. It is the perspective view which showed the aspect which temporarily fixes the cross | intersection part of a main reinforcement (single reinforcement) and a reinforcement ring using the reinforcing bar binding tool which concerns on embodiment, (a) is the figure seen from the inner side of the main reinforcement, b) is a view from the outside of the main muscle. It is the perspective view which showed the binding metal fitting of the cross | intersection part of the main reinforcement and the hoop reinforcement in the conventional reinforcement bar. It is a figure for demonstrating the binding work using the conventional binding metal fitting, (a) is a perspective view which shows a binding work process, (b) is a perspective view which shows the completion state of a binding work. It is the perspective view which showed the binding metal fitting of the cross | intersection part of the main reinforcement and the reinforcement ring in the conventional reinforcement bar. It is a figure for demonstrating the binding work using the conventional binding metal fitting, (a) is a side view which shows a binding work process, (b) is a side view which shows the completion state of a binding work.

  Embodiments of a reinforcing bar binding tool according to the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a reinforcing bar binding device according to an embodiment, where (a) shows a single muscle and (b) shows a binding bar.

  In the present embodiment, a plurality of main bars (for example, deformed steel bars of about D22 to D51) (single bars or bundled bars) arranged in the direction of the central axis on the circumference, and relatively wide inside these main bars. A plurality of ring-shaped reinforcing frames (for example, a frame member made of a strip-shaped steel plate having a width of about 50 to 100 mm and a thickness of about 6 to 12 mm) disposed between the reinforcing frames. Reinforcing bar scissors (for example, having a length of about 3.5 to about 5 to 10), including a plurality of hoop bars (for example, deformed steel bars of about D10 to D25) disposed in a state of being wound around the main bars at narrow intervals. The reinforcing bar binding metal fitting used when assembling a 12 m diameter having a diameter of about 0.6 to 2.8 m will be described.

  A reinforcing bar binding tool 10 for a single muscle shown in FIG. 1A is for binding a main bar (vertical bar) constituting a reinforcing bar rod and a hoop bar (horizontal bar) or a reinforcing frame that intersects with the main bar. The length is set according to the diameter of the main bar and the number of bundles (one in this case), the coil spring member 11 is surrounded by the outer periphery of the main bar, and is attached to both ends of the coil spring member 11 and can be hooked on the hoop bar or the reinforcing frame. It is comprised with the latching members 12A and 12B which made the substantially U shape.

  Further, the reinforcing bar binding metal fitting 10A shown in FIG. 1B is for a binding bar, except that the length of the coil spring member 11A is set according to the number of main bars (two in this case). The configuration is the same as that of the reinforcing bar binding tool 10 shown in FIG.

  Each of the coil spring members 11 and 11A is composed of a tension coil spring using a hard steel wire, and has a wire constant of 0.8 to 1.4 mm and 0.07 to 1.7 N / mm. Can be done. In particular, a wire having a wire diameter of about 1.2 mm and a spring constant characteristic of about 0.71 N / mm is particularly preferable for use, that is, for achieving both binding strength and workability during binding.

  The length of the coil spring member 11 is set to about 30 to 60 mm, and the coil diameter (outer diameter) is set to about 7 to 10 mm. If it is such a length, it can be applied when a main muscle (single muscle) having a thickness of about D22 to D51 is adopted, can be provided with versatility, and manufacturing costs can be suppressed. . The length of the coil spring member 11A is set to about 50 to 80 mm, and the coil diameter is set to about 7 to 10 mm. If it is such a length, it can be applied in the case where a bundling bar is used in which two main bars having a thickness of about D22 to D51 mm are bundled. It becomes possible to suppress.

  The latching members 12A and 12B include a U-shaped portion 12a made of a band-shaped metal plate and a bent portion 12b formed by bending one end of the U-shaped portion 12a outward, and the U-shaped portion 12a. Depth d and width w of a size that can hook an operator's finger and that can also hook a hoop muscle lap joint, for example, depth d is 28 to 60 mm, and width w is about 14 to 30 mm. Is set. Further, an opening 12c through which the ends of the coil spring members 11 and 11A are inserted in a wound state is formed at a substantially central portion of the bent portion 12b. In addition, in the said embodiment, although the bending part 12b is provided, it can also be set as the structure which does not bend one end of the U-shaped part 12a outside, and the U-shaped part 12a is formed from a strip | belt-shaped metal plate. However, it is also possible to employ a metal bar (round bar or the like) processed into a U shape.

  FIG. 2 is a perspective view showing an aspect in which the intersection of the main muscle (single muscle) and the hoop muscle is bound (solidified) using the reinforcing bar binding tool 10 according to the embodiment. The figure seen from the inner side, (b) is the figure seen from the outer side of the main muscle.

  As shown in FIG. 2, the objects to be fixed are the main muscle 1 arranged circumferentially and the hoop muscle 2 arranged in a wound state on the outer side of the main muscle 1, and both are substantially orthogonal at the intersection. The intersection is bound by the reinforcing bar binding tool 10. 2 and 3 show the bundling state at the lap joint portion where the hoop muscles 2 are overlapped, but the portion other than the lap joint portion (one portion) can be similarly bound. It is like that.

  When attaching the reinforcing bar binding tool 10 to the intersection of the main bar 1 and the hoop bar 2, first, one hooking member 12A attached to one end of the coil spring member 11 is placed inside the main bar 1 (inside the reinforcing bar). ), The coil spring member 11 is wound around the outer periphery of the main bar 1 so that the other hook member 12B is hooked on the operator's finger while the other hook member 12B is hooked on the operator's finger. By hooking the latching member 12B on the hoop muscle 2, the main muscle 1 and the hoop muscle 2 are bound. Note that it is preferable that the latching members 12A and 12B are latched on the hoop muscle 2 so that the U-shaped portions 12a face each other.

  FIG. 3 is a perspective view showing a mode of binding (solidifying) the intersection of the main muscle (bundling muscle) and the hoop muscle using the reinforcing bar binding tool 10A according to the embodiment. Is a view seen from the inside of the main muscle, (b) is a view seen from the outside of the main muscle.

  When attaching the reinforcing bar binding tool 10A to the intersection of the binding bar 1A and the hoop bar 2, as in the case of the reinforcing bar binding tool 10, one hooking member 12A attached to one end side of the coil spring member 11A is bundled. After being hooked on the hoop bar 2 from the inside of the bar 1A (inside the reinforcing bar), the other barb member 12B is hooked on the operator's finger, and the coil spring member 11A is wound while being pulled to be bundled. The bundling muscle 1A and the hoop muscle 2 are bound together by surrounding the outer periphery of 1A and engaging the other hooking member 12B with the hoop muscle 2.

  Further, the reinforcing bar binding tool 10 according to the embodiment can also bind (temporarily fix) the intersection of the main bar and the reinforcing ring. FIG. 4 is a perspective view showing a mode of binding (temporarily fixing) the intersection of the main muscle (single muscle) and the reinforcing ring using the reinforcing bar binding tool 10 according to the embodiment. The figure seen from the inner side, (b) is the figure seen from the outer side of the main muscle.

  As shown in FIG. 4, the objects to be fixed are the main bars (vertical bars) 1 arranged in a circumferential shape and the reinforcing ring 3 arranged inside the main bars 1, and both are substantially orthogonal at the intersection. The intersection is bound by the reinforcing bar binding tool 10.

When the reinforcing bar binding tool 10 is attached to the intersection of the main reinforcement 1 and the reinforcing ring 3, it is attached to one end side of the coil spring member 11 as in the case of attachment to the intersection of the main reinforcement 1 and the hoop reinforcement 2 described above. After one latching member 12A is latched to the reinforcing ring 3 from the outside of the main bar 1 (the outside of the reinforcing bar), the coil spring member 11 is placed in a state where the other latching member 12B is hooked on the operator's finger. The main bar 1 and the reinforcing ring 3 are bound together by surrounding the outer periphery of the main bar 1 while pulling and pulling the other hooking member 12B on the reinforcing ring 3. The latching members 12A and 12B are latched on the reinforcing ring 3 so that the U-shaped portions 12a face each other. In addition, when the reinforcing bar binding tool 10 is used for temporarily fixing the main reinforcing bar 1 and the reinforcing ring 3, it can be recovered and reused when the reinforcing bar rod is built.
Moreover, if the reinforcing bar binding tool 10A according to the embodiment is used, it is possible to bind (temporarily fix) the intersection of the main bar (bundling bar) and the reinforcing ring as described above.

  According to the reinforcing bar binding tools 10 and 10A according to the above-described embodiment, the coil spring members 11A and 11B are used to bind the main muscle 1 (single muscle or binding muscle) and the hoop muscle 2 or the reinforcing ring 3 at the intersection. Therefore, without being limited by the arrangement interval between the hoop muscles 2 and the arrangement interval between the hoop muscles 2 and the reinforcing ring 3, that is, even when these intervals are narrow, the main muscle 1 and the hoop muscle 2 or reinforcement. The ring 3 can be securely bound, and by using the elastic force of the spring, correction of the position of the hoop muscles in the bound state, that is, correction and fine adjustment of the distance between the hoop muscles 2 can be easily performed. It can be carried out.

  Further, since the lengths of the coil spring members 11A and 11B are set according to the diameter and the number of bundles of the main reinforcement 1, even if the arrangement of the main reinforcements 1 constituting the reinforcing bar is a single reinforcement, it is a bundle reinforcement. However, the operator can efficiently and reliably bind the main muscle 1 to the hoop muscle 2 or the reinforcing ring 3 and maintain a stable binding state with sufficient binding strength.

  Moreover, since the coil spring members 11A and 11B are made of a tension coil spring using a hard steel wire, the durability is high, and the wire diameter is 0.8 to 1.4 mm and 0.07 to 1.7 N / mm. Because it has the spring constant characteristics, it can be securely attached with a force that does not burden the operator, while maintaining a stable bundling state with sufficient bundling strength using the elastic force (contraction force) of the spring. It is possible to achieve both workability and mounting stability.

  Further, the depth d and the width w of the U-shaped portion 12a of the latching members 12A and 12B are set to a size that allows the operator's finger to be latched and the lap joint portion of the hoop muscle 2 to be latched. Therefore, it is easy to use and can be hooked without any problem even at the lap joint portion of the hoop muscle 2.

  Moreover, since the thickness of the hoop muscle 2 generally used is about D10 to D25 and is about the same as or less than the diameter of the operator's finger, the hoop muscles having different diameters in one form. Even when 2 is used, it can be applied, has high versatility, and can suppress the manufacturing cost.

  In addition, the steel piles for cast-in-place piles are large, so depending on the construction site conditions (space, etc.), there are many cases where they cannot be assembled at the construction site. There is an increasing number of cases where they are transported and brought to the construction site.

  When the rebar rod assembled by a completely welding-free method using the rebar fixing bracket described in Japanese Patent No. 3914897 previously invented by the inventor is transported by truck, the fastening bolt of the rebar fixing bracket is transported. However, when the main bar and the hoop bar are consolidated using the reinforcing bar binding tools 10 and 10A according to the embodiment, the coil spring members 11 and 11A are moved during transportation. By absorbing the vibration of the entire collar, the vibration is suppressed, and as a result, the above-described loosening of the tightening bolt can be eliminated.

  Conventionally, when reinforcing bars that have been assembled by binding the main and hoop bars together with a tie wire (diameter of about 0.8 mm) are transported by truck, the tie wire may be loosened or broken due to vibration during transportation. For this reason, it has been unavoidable to weld the intersection of the hoop and the main reinforcing bar, which cannot be welded. In this case as well, the reinforcing bar binding tools 10 and 10A according to the embodiment are used. If the main bar and the hoop bar are tightly connected, there is no risk of loosening or cutting like a binding line, and there is no need to weld the intersection between the hoop bar and the main bar, improving workability. it can.

10, 10A Reinforcing bar binding tool 11, 11A Coil spring member 12A, 12B Hanging member 12a U-shaped part
12b Bent part 12c Opening part

Claims (3)

A reinforcing bar binding tool that binds the vertical bars constituting the reinforcing bar rods and the horizontal bars or reinforcing frames that intersect the vertical bars.
A length is set according to the diameter and the number of bundles of the vertical bars, and a coil spring member that surrounds the outer periphery of the vertical bars,
A reinforcing bar binding tool comprising a substantially U-shaped hooking member which is attached to both ends of the coil spring member and can be hooked to the horizontal bar and / or the reinforcing frame.   The coil spring member is composed of a tensile coil spring using a hard steel wire, and has a wire constant of 0.8 to 1.4 mm and a spring constant characteristic of 0.07 to 1.7 N / mm. The reinforcing bar binding tool according to claim 1. The hook member is a U-shaped part made of a strip-shaped metal plate;
It consists of a bent portion formed by bending one end of the U-shaped portion outward,
The U-shaped part has a depth of 28 to 60 mm and a width of 14 to 30 mm,
The reinforcing bar binding tool according to claim 1 or 2, wherein the bent portion is formed with an opening through which an end portion of the coil spring member is inserted in a wound state.

Images