JP2021116631A - Beam reinforcement, and arrangement method of the same - Google Patents

Abstract

To provide a beam reinforcement with high strength and excellent workability, and an arrangement method of the same.SOLUTION: A beam reinforcement comprises: a lower unit 50 in which first stirrups 10 having a bottom reinforcement portion 11 and left and right erected reinforcement portions 12 are arranged with a prescribed pitch s and in which the first stirrups 10 are connected with each other by an upper end main reinforcement 30 at an upper end inside of the corresponding left and right erected reinforcement portions 12 with total strength welding; and an upper unit 60 in which second stirrups 20 having a top end reinforcement portion 21 and left and right hanging reinforcement portions 22 downwardly hanging and extending to the bottom reinforcement portion 11 are arranged with the prescribed pitch s, in which the second stirrups 20 are weld-connected with each other by two stages of horizontal reinforcements 40 at a predetermined position outside of the corresponding left and right hanging reinforcement portions 22, and which does not have a hook at an end portion of the hanging reinforcement portion 22. The corresponding erected reinforcement portion 12 and the hanging reinforcement portion 22 are overlapped with each other, the upper stage horizontal reinforcement 40A is arranged at a center position of a beam reinforcement height, and the lower stage horizontal reinforcement 40B is arranged at a lateral side etc. of a lower end main reinforcement 70.SELECTED DRAWING: Figure 3

Description

The present invention relates to beam reinforcement and a method for arranging the reinforcement.

When arranging the beam reinforcements that make up the foundation beams of the building and the beams that connect the columns, multiple reinforcing bars are arranged at the site while measuring the pitch between the stirrups over the longitudinal direction of the beam stirrup. A construction method using so-called welded reinforcing bars is applied in order to attach horizontal bars (abdominal muscles) to the vertical bars that make up the bars by binding, etc., and to streamline the work of connecting multiple main bars to the upper, lower, inner and lower sides of the stirrups. Sometimes. In this welded reinforcing bar, for example, a stirrups and a horizontal reinforcing bar are unitized in advance by welding at a factory or the like, and such a welded reinforcing bar is brought into a site and, for example, an upper unit and a lower unit are connected at the site. By doing so, the closed stirrups are arranged. Then, the beam reinforcements are arranged by arranging the upper end main reinforcement and the lower end main reinforcement inside the upper and lower sides of the closed type stirrups and binding them together.

Here, the reinforcement structure of the beam reinforcement is formed by covering the lower unit, which is unitized by the upper end main reinforcement and the lower end main reinforcement, with a cap tie that does not have a hook, and arranging the plurality of stirrups. (See, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2016-29249

However, in the beam reinforcement described in Patent Document 1, in addition to the fact that the upper stirrups, which are cap ties, do not have hooks, the reinforcements are arranged with the cap ties slightly wrapped around the lower stirrups. It is unclear whether or not the beam has sufficient strength because it is only used. According to the reinforced concrete reinforcement guideline and commentary 2010 (Architectural Institute of Japan), in the above-mentioned cap tie type reinforcement, for example, a 135 degree hook is provided at the upper end of the lower rebar, and the lower part of the rebar is provided with a 135 degree hook. Reinforcing bar arrangement specifications are described in which the stirrups and cap ties are overlapped with a lap joint length of 8d (d is the name of the deformed reinforcing bar). In view of such general specifications, whether or not the strength of the cap tie type beam reinforcement described in Patent Document 1 is sufficient, in other words, the closed type reinforcing bar is provided in such a manner that the upper and lower stirrups are strong. I have to say that it is unclear whether or not it is formed.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a beam bar having high strength and excellent workability and a method of arranging the beam bar.

In order to achieve the above object, one aspect of the beam reinforcement according to the present invention is
The first stirrups, which have a U-shape that opens upward and have a bottom muscle portion and a rising muscle portion that rises upward from the left and right ends of the bottom muscle portion, are arranged at a predetermined pitch, and each of the first stirrups is arranged. A lower unit in which the stirrups are connected to the upper end main bar by full-strength welding inside the upper end of the corresponding rising bar on the left and right.
A second stirrup muscle that has a U-shape that opens downward and has a crown muscle portion and a drooping muscle portion that hangs downward from the left and right ends of the crown muscle portion and extends to the bottom muscle portion is specified. The second stirrups are connected to each other by welding at predetermined positions on the outside of the corresponding left and right sagging muscles by two-stage horizontal streaks, and are connected to the ends of the sagging muscles. Consists of an upper unit that does not have a hook,
A beam bar is formed by connecting the lower end main bar to the inside of the bent portion at the boundary between the bottom bar portion and the rising bar portion forming the first stirrups.
In a state where the upper unit is covered with the lower unit, the rising muscle portion of the corresponding first stirrup muscle and the sagging muscle portion of the second stirrup muscle wrap, and the lateral streaks of the two steps. Among them, the upper horizontal bar is arranged at the center position of the height of the beam bar, and the lower horizontal bar is arranged on the side of the bottom bar or the side of the lower end main bar. do.

According to this aspect, the rising muscle portion of the lower unit in which a plurality of first stirrups are integrated by the upper end main bar and the upper unit in which a plurality of second stirrups are integrated by two-stage lateral streaks. At this time, the upper horizontal muscle of the two horizontal muscles is arranged at the center of the height of the beam muscle, and the lower horizontal muscle is the lateral or lower end main muscle of the bottom muscle. By being arranged laterally, a beam bar integrated with high strength is formed. Both of the two-tiered lateral muscles are connected to the outside of the sagging muscle portion. Here, with respect to the fact that the upper horizontal bar is arranged at the center position of the height of the beam bar, the "center position of the height of the beam bar" is strictly at the center position of the height of the beam bar. In addition to that, it means that the range of about 10% of the height of the beam bar is included up and down from the central position of the height of the beam bar. Further, "total strength welding" in which the first stirrups and the upper end main bars are connected in the lower unit is also called "full strength rebar cross welding", and the welded portion has a strength equal to or higher than the JIS standard yield point of the stirrups. However, the elongation of the main bar is also equal to or higher than the JIS standard value of the reinforcing bar before welding, which means spot welding in which the shear strength of the welded portion is equal to or higher than the short-term allowable tensile strength of the loose bar. In normal spot welding, the welded portion guarantees about 1/3 to 2/3 of the JIS standard yield point of the reinforcing bar. This full-strength welding is a welding method in which normal spot welding is repeated two or more times, and the welding is blunted by performing a second spot welding after one spot welding and before the welded portion is rapidly cooled.

The lower end main bar, which is not necessarily included in the lower unit, is connected to the inside of the bent portion at the boundary between the bottom bar and the rising bar forming the first stirrups. The lower end main bar may also be connected to the first stirrups by full-strength welding, or may be bound by a binding wire or the like. The mode of connecting the lower end main bar to the first stirrups differs depending on the difference in the bar arrangement method described later.

On the other hand, "welding" that connects a plurality of second stirrups and lateral bars in the upper unit means welding in a broad sense, which means general spot welding, in addition to full-strength welding. Further, in the upper unit, the lower horizontal bar is welded to the lower end or the vicinity of the lower end (side of the bottom bar or the side of the lower end main bar) of the drooping muscles of the plurality of second stirrups, so that this welding is performed. The lower horizontal muscle serves as a hook substitute muscle in the second stirrups muscle. Similarly, in the lower unit, the welded upper end main bar serves as a hook replacement bar in the first stirrups. By providing the lower horizontal bar which is a hook substitute muscle in this way, the hook can be eliminated from the second stirrups. Similarly, by providing the upper end main bar which is a hook substitute bar, the hook can be eliminated from the first stirrups.

In this embodiment, the corresponding rising muscle portion of the first stirrup muscle and the sagging muscle portion of the second stirrup muscle wrap, but it is not necessary for this wrap length to satisfy a predetermined lap joint length. In principle, there are no restrictions on the lap length. For example, in a beam having a low beam length, if a predetermined lap joint length is required for the lap portion of the rising muscle portion and the hanging muscle portion, the predetermined lap joint length may not be satisfied. Therefore, in this embodiment, although the lap portion of the rising muscle portion and the hanging muscle portion does not have a predetermined lap joint length, the center position and the lower end position of the height of the beam reinforcement (the side of the bottom reinforcement portion and the lower end main reinforcement). By arranging the horizontal streaks on each side), the corresponding first stirrups and the second stirrups are integrated.

Further, another aspect of the beam reinforcement according to the present invention is characterized in that it is applied to a beam having a beam length of 500 mm or less.

According to this aspect, in a beam having a low beam length of 500 mm or less, the lap portion of the rising bar portion and the drooping bar portion does not have a predetermined lap joint length, but the center of the height of the beam bar. By arranging the horizontal bars at the position and the lower end position (side of the bottom bar or the side of the lower end main bar), the first and second stirrups are integrated. Can be formed. Here, the "beam having a column structure of 500 mm or less" includes, for example, a beam having a beam structure of 400 mm or more and 500 mm or less.

In addition, another aspect of the beam bar according to the present invention is characterized in that the two-stage horizontal bar is connected by full-strength welding on the outside of the droop bar portion.

According to this aspect, since the second stirrups and the two-stage horizontal bars are connected by full-strength welding instead of normal spot welding, it is possible to form a beam bar having even higher strength.

Further, one aspect of the method of arranging beam reinforcements according to the present invention is as follows.
The first stirrups, which have a U-shape that opens upward and have a bottom muscle portion and a rising muscle portion that rises upward from the left and right ends of the bottom muscle portion, are arranged at a predetermined pitch, and each of the first stirrups is arranged. A lower unit installation process in which the stirrups are arranged inside the upper ends of the corresponding rising muscles on the left and right by connecting the lower units to the upper end main bars by full-strength welding.
A second stirrups, which have a U-shape that opens downward and have a crown muscle portion and a drooping muscle portion that hangs downward from the left and right ends of the crown muscle portion, are arranged at a predetermined pitch, and each first An upper unit in which the two stirrups are connected by welding at predetermined positions on the outside of the corresponding left and right sagging muscles by two-stage horizontal streaks and does not have a hook at the end of the sagging muscles. , The lower unit is covered with a reinforcing bar, and the rising muscle portion of the corresponding first stirrups and the sagging muscle portion of the second stirrup are wrapped, and the upper part of the two lateral muscles is wrapped. The upper and lower unit connecting steps in which the horizontal bar is arranged at the center position of the height of the beam bar and the horizontal bar in the lower stage is arranged and connected to the side or the vicinity of the bottom bar portion.
It is characterized by having a lower end main bar connecting step of connecting the lower end main bar inside the bent portion of the boundary between the bottom bar portion and the rising bar portion forming the first stirrups.

According to this aspect, for example, the upper unit and the lower unit manufactured in the factory are transported to the site, and at least the rising muscle portion of the first stirrup muscle and the sagging muscle portion of the second stirrup muscle are wrapped to wrap the upper unit. Of the two-tiered horizontal bars, the upper horizontal bar is placed at the center of the height of the beam bar, and the lower horizontal bar is located on the side of the bottom bar or near it (of the lower end main bar arranged in the subsequent process). By arranging them on the side) and assembling the corresponding rising muscles and hanging muscles by binding or the like, the beam reinforcements can be efficiently arranged. In particular, since the lower unit has the upper end main bar, when the second stirrups constituting the upper unit are covered from above the lower unit, the second stirrups can be placed on the upper end main bar. In this mounted state, the two-stage horizontal bars can be automatically arranged at the center position and the lower end position (side of the bottom bar or the side of the lower end main bar) at the height of the beam bar. In this embodiment, the lower unit does not have the lower end main bar, and therefore, after binding the upper unit and the lower unit, the bottom muscle portion and the rising muscle portion constituting the first stirrups of the lower unit Connect the lower end main bar to the inside of the bending part of the boundary. This connection can be made, for example, by binding. Further, according to this aspect, since the lower unit does not have the lower end main bar, the lower unit is extended when the lower unit having the same weight is manufactured as compared with the case where the lower unit has the lower end main bar. The unit length in the longitudinal direction of the beam bar) can be increased.

In addition, another aspect of the method of arranging beam reinforcements according to the present invention is as follows.
The first stirrups, which have a U-shape that opens upward and have a bottom muscle portion and a rising muscle portion that rises upward from the left and right ends of the bottom muscle portion, are arranged at a predetermined pitch, and each of the first stirrups is arranged. The stirrups are connected to the upper end main bar by full-strength welding inside the upper end of the corresponding rising bar on the left and right, and the lower end main bar is welded inside the boundary between the bottom bar and the rising bar. The lower unit installation process, which arranges the connected lower units, and
A second stirrups, which have a U-shape that opens downward and have a crown muscle portion and a drooping muscle portion that hangs downward from the left and right ends of the crown muscle portion, are arranged at a predetermined pitch, and each first An upper unit in which the two stirrups are connected by welding at predetermined positions on the outer side of the corresponding left and right sagging muscles by two-stage horizontal streaks and does not have a hook at the end of the sagging muscles. , The lower unit is covered with a reinforcing bar, and the rising muscle portion of the corresponding first stirrups and the sagging muscle portion of the second stirrup are wrapped, and the upper part of the two lateral muscles is wrapped. The upper and lower unit connecting steps in which the horizontal bar is arranged at the center of the height of the beam bar and the lower horizontal bar is arranged and connected to the side of the bottom bar or the side of the lower end main bar. It is characterized by having.

According to this aspect, since the lower unit has both the upper end main bar and the lower end main bar connected to the first stirrups by welding, the upper unit is bound to the lower unit by binding or the like. When assembled, the reinforcement arrangement of the beam reinforcement can be completed. That is, it is possible to eliminate the trouble of further arranging the lower end main reinforcement after assembling the lower unit and the upper unit. Further, also in this embodiment, when the second stirrups are placed on the upper end main bar, the two horizontal bars are placed at the center position and the lower end position of the height of the beam bar (side of the bottom bar or the side of the lower end main bar). Can be automatically placed on the side).

As can be understood from the above description, according to the beam bar of the present invention and the method of arranging the beam, it is possible to provide a beam bar having high strength and excellent workability.

It is a process drawing explaining an example of the reinforcement arrangement method of the beam reinforcement which concerns on 1st Embodiment. Following FIG. 1, it is a process diagram for explaining the method of arranging the beam reinforcements according to the first embodiment, and is a diagram showing an example of a beam reinforcement intermediate. Following FIG. 2, it is a process diagram for explaining the method of arranging the beam bars according to the first embodiment, and is a diagram for explaining an example of the beam bars according to the first embodiment. It is a process drawing explaining an example of the reinforcement arrangement method of the beam reinforcement which concerns on 2nd Embodiment. Following FIG. 4, it is a process diagram for explaining the method of arranging the beam bars according to the second embodiment, and is a diagram for explaining an example of the beam bars according to the second embodiment.

Hereinafter, the method of arranging the beam reinforcement and the beam reinforcement formed by each method of arranging the beam according to each embodiment will be described with reference to the attached drawings. In the present specification and the drawings, substantially the same components may be designated by the same reference numerals to omit duplicate explanations.

[Beam Reinforcement and Reinforcement Arrangement Method According to First Embodiment]
First, with reference to FIGS. 1 to 3, an example of a beam reinforcement method according to the first embodiment and an example of a beam reinforcement formed by this method will be described. Here, FIGS. 1 to 3 are process diagrams for explaining an example of the method of arranging the beam bars according to the first embodiment in this order, and FIG. 3 further shows the beam bars according to the first embodiment. It is a figure explaining an example. As shown in FIG. 1, in the method of arranging the beam reinforcements according to the present embodiment, the lower unit 50 and the upper unit 60 are manufactured in advance at a factory or the like and transported to the site, and the lower unit 50 and the upper unit are transported at the site. By assembling 60, the beam reinforcement is arranged.

As shown in FIG. 1, the lower unit 50 has a U-shape that opens upward, and has a bottom muscle portion 11 and a rising muscle portion 12 that rises upward from the left and right ends of the bottom muscle portion 11. The stirrups 10 are arranged at a predetermined pitch s in the Z direction, which is the longitudinal direction of the beam streaks, and the first stirrups 10 are arranged in the upper end main bars 30 inside the upper ends of the corresponding left and right rising streaks 12. It is formed by being connected by.

Here, the connection between the rising bar portion 12 and the upper end main bar 30 is connected by full-strength welding. This full-strength welding is a welding in which normal spot welding is repeated two or more times, and is a welding method in which a second spot welding is performed after one spot welding and before the welded portion is rapidly cooled, thereby quenching. By this full-strength welding, the welded portion of the first stirrup bar 10 and the upper end main bar 30 has strength equal to or higher than the JIS standard yield point of the first stirrup bar 10, and the elongation of the reinforcing bar is also the JIS standard value of the reinforcing bar before welding. As described above, the shear strength of the welded portion is equal to or higher than the short-term allowable tensile strength of the reinforcing bar, and both members are connected with a high connection strength.

The predetermined pitch s shown is determined from the required amount of reinforcing bars in concrete, such as 150 mm and 200 mm. Further, the first stirrups 10 are formed of, for example, deformed steel bars, and reinforcing bars having a diameter of 10 mm (D10), D13, etc. are applied, which is also determined from the required amount of reinforcing bars in relation to the predetermined pitch s.

A deformed steel bar having a predetermined diameter is applied to the upper end main bar 30, and since there are two upper end main bars 30 in the illustrated example, the diameter is set so as to satisfy the design bending moment, the design shearing force, and the like. From the viewpoint of the required amount of reinforcing bars, one or more separate upper end main bars 30 may be arranged between the two upper end main bars 30 in the finally arranged state. For example, in the illustrated example, deformed steel bars such as D19 and D22 can be applied (the above is the lower unit installation step).

On the other hand, the upper unit 60 has a U-shape that opens downward, and has a crown muscle portion 21 and a droop muscle portion 22 that hangs downward from the left and right ends of the crown muscle portion 21. 20 are arranged at a predetermined pitch s in the Z direction, which is the longitudinal direction of the beam bar, like the first stirrup bar 10, and the second stirrups 20 are respectively corresponding left and right sagging muscle portions 22. It is formed by being connected by welding to a two-stage horizontal bar 40 (upper horizontal bar 40A and lower horizontal bar 40B) at a predetermined position on the outside of the above.

Here, the length of the drooping muscle portion 22 is L, and it has a length of reaching the bottom muscle portion 11 of the first stirrups 10 in a state where the beam muscle intermediate 100'shown in FIG. 2 is formed. is doing. Then, regarding the attachment positions of the upper horizontal bar 40A and the lower horizontal bar 40B with respect to the respective hanging muscle portions 22, the mounting position of the upper horizontal bar 40A is the position of L / 2 in the middle of the length L of the hanging muscle portion 22 (beam). It is an intermediate position (L / 2 position) of the height of the muscle intermediate 100'. On the other hand, the attachment position of the lower horizontal bar 40B is the position near the lower end or the lower end of the hanging bar portion 22 (the lateral position of the bottom bar portion 11 in FIG. 2 or the side of the lower end main bar 70 in the beam bar 100 shown in FIG. 3). Position).

Then, the two-stage horizontal bars 40 are all connected to the hanging bar portion 22 by welding. This welding may be normal spot welding, but it is preferably connected by full-strength welding as in the welding of the first stirrups 10 and the upper end main bar 30 in the lower unit 50.

Further, the lower end of the hanging muscle portion 22 of the second stirrups 20 does not have a hook, and the lower horizontal streak 40B is connected by welding at or near the lower end, so that the lower horizontal streak 40B is formed. It is a hook alternative to the hook. As described above, although the second stirrups 20 do not have hooks at the ends of the drooping streaks 22, the lower horizontal streaks 40B are connected by welding, preferably by full-strength welding, and thus are connected to the hooks. Good fixability of the expected second stirrups 20 in concrete is guaranteed.

Similarly, in the lower unit 50, although the first stirrups 10 do not have hooks at the ends of the rising streaks 12, the upper end main bars 30 are connected by welding, so that the upper end main bars 30 are connected. Is a hook alternative to the hook. In this way, since the upper end main bar 30 is connected to the end of the first stirrups 10 by full-strength welding, the good fixability of the first stirrup bars 10 expected for the hook in the concrete can be obtained. Guaranteed.

The lower unit 50 and the upper unit 60 in the illustrated example each have five first stirrups 10 and two second stirrups 20 at the same pitch s, but they can be transported to the site. In addition, from the viewpoint of workability such as transportability at the site, the unit may have 6 or more stirrups and be as long as possible in the Z direction.

In particular, since the lower unit 50 has only the upper end main bar 30 as the main bar and does not have the lower end main bar, the lower unit 50 is compared with the lower unit applied by the bar arrangement method according to the second embodiment described later. The weight of is relatively light. Therefore, the lower unit 50 can be made longer in the Z direction than the lower unit according to the second embodiment having the lower end main bar. Further, when a longer lower unit 50 is prepared in this way, the upper unit 60 is also prepared with a length corresponding to the longer lower unit 50.

Next, as shown in FIG. 2, the upper unit 60 is placed over the lower unit 50 to arrange the reinforcing bars, and the corresponding rising muscle portion 12 of the first stirrups 10 and the sagging muscle portion 22 of the second stirrups 20 are arranged. By wrapping and connecting the beams, the beam reinforcement intermediate 100'is constructed (upper and lower unit connection process).

In this upper and lower unit connecting step, since the lower unit 50 has the upper end main bar 30, when the second stirrups 20 constituting the upper unit 60 are covered from above the lower unit 50, the two upper end main bars A second stirrups 20 can be placed on top of 30.

Next, as shown in FIG. 3, the lower end main bar 70 is arranged and connected to the inside of the bent portion at the boundary between the bottom bar portion 11 and the rising bar portion 12 forming each of the first stirrups 10. The beam reinforcement 100 according to the first embodiment is arranged (lower end main reinforcement connection step). Here, the lower end main bar 70 is connected to the first stirrups 10 by binding with a binding line or the like.

Here, the beam formed by the beam reinforcement 100 of the illustrated example is intended for a beam having a low beam formation of 500 mm or less. More specifically, the beam bar 100 in the illustrated example is suitable for a beam having a beam length of 400 mm or more and 500 mm or less. Therefore, the length of the lap portion between the rising muscle portion 12 and the hanging muscle portion 22 (the lap length is the length L of the rising muscle portion 12 and the hanging muscle portion 22) is a predetermined lap joint length (for example, the hanging muscle portion). It does not have a lap joint length (25 times the diameter d of 22).

If a predetermined lap joint length is required for the lap portion of the rising muscle portion 12 and the hanging muscle portion 22 for a beam having such a low beam formation, the predetermined lap joint length may not be satisfied. ..

Therefore, in the beam bar 100, although the lap portions of the rising bar portion 12 and the drooping bar portion 22 do not have a predetermined lap joint length, the lap length of the lap portion is secured at the height L of the beam bar 100. Above, the upper horizontal bar 40A and the lower horizontal bar 40B are arranged at the center position and the lower end position (sides of the bottom bar 11 and the lower end main bar 70) of the height of the beam bar 100, respectively. The first stirrups 10 and the second stirrups 20 can be integrated with high strength.

Further, by arranging the upper horizontal bar 40A and the lower horizontal bar 40B at the center position and the lower end position (sides of the bottom bar 11 and the lower end main bar 70) of the height of the beam bar 100, respectively, it is a bending fracture leading type. The beam can be formed, and the beam reinforcement 100 is provided to the beam in which brittle fracture is suppressed.

That is, since the rising muscle portion 12 of the first rib muscle 10 and the hanging muscle portion 22 of the second rib muscle 20 wrap to form the beam muscle 100, at least the beam muscle 100 having this lap portion In the region above the height, the stirrups are doubly arranged, and the amount of reinforcing bars (the amount of stirrups) is larger than in the region below the height of the beam bar 100. For example, if the upper horizontal bar 40A is placed in a region above the center of the height of the beam 100, the upper horizontal bar 40A is added to the amount of reinforcing bars in addition to the large amount of loose bars as described above, and the upper side. There is a risk that the bending strength at both ends of the beam, where the tensile bending moment is predominant, will become too large, and there is a high possibility that the beam will be a shear failure leading type beam. Therefore, in the illustrated beam bar 100, by arranging the upper horizontal bar 40A at the center position of the height L of the beam bar 100, the bending strength at both ends of the beam is reduced, and the beam fracture leading type is not used. It is possible to easily form a beam of the bending fracture leading type.

[Beam Reinforcement and Reinforcement Arrangement Method According to Second Embodiment]
Next, with reference to FIGS. 4 and 5, an example of the beam reinforcement method according to the second embodiment and an example of the beam reinforcement according to the second embodiment formed by this reinforcement method. Will be described. Here, FIGS. 4 and 5 are process diagrams for explaining an example of the method of arranging the beam bars according to the second embodiment in this order, and FIG. 5 further shows the beam bars according to the second embodiment. It is a figure explaining an example. As shown in FIG. 4, also in the method of arranging the beam reinforcements according to the present embodiment, the lower unit 50A and the upper unit 60A are manufactured in advance at a factory or the like as in the method of arranging the reinforcements of the first embodiment. Is transported to the site, and the lower unit 50A and the upper unit 60A are assembled at the site to arrange the beam reinforcement. In the following description, by describing the differences from the bar arrangement method of the first embodiment, it becomes easy to understand the bar arrangement method of the second embodiment and the structure of the beam reinforcement. The reinforcement arrangement method and the beam reinforcement of the second embodiment will be described with reference to FIG. 3 as appropriate.

As is clear from comparing FIGS. 1 and 4, in the bar arrangement method according to the second embodiment, the lower unit 50A is welded to the inside of the upper ends of the left and right rising bar portions 12 of the first stirrups 10. In addition to having the upper end main bar 30 at the above, the lower end main bar 70 is provided inside the boundary between the bottom bar portion 11 and the rising bar portion 12 by full-strength welding. That is, it is a feature that the upper end main bar 30 and the lower end main bar 70 are simultaneously arranged by the lower unit installation step.

Unlike the lower unit 50 in the first embodiment, the lower unit 50A in the second embodiment has the same weight as the lower unit 50, for example, because the unit weight increases by the amount of having the lower end main bar 70. When trying to manufacture the lower unit 50A, it is necessary to make the length in the Z direction, which is the longitudinal direction of the beam bar, relatively short in order to guarantee the same level of workability. For example, the lower unit 50 in FIG. 1 includes five first stirrups 10 having a predetermined interval s, whereas the lower unit 50A in FIG. 4 has four first stirrups 10 having a predetermined interval s. It is provided with one stirrups 10, for example, the total weight is about the same. The upper unit 60A also includes four second stirrups 20 having a predetermined interval s according to the lower unit 50A.

Therefore, as shown in FIG. 5, the upper unit 60A is placed over the lower unit 50A to arrange the reinforcing bars, and the corresponding rising muscle portion 12 of the first stirrups 10 and the sagging muscle portion 22 of the second stirrup muscle 20 are arranged. By wrapping and connecting by binding or the like, the reinforcement arrangement of the beam reinforcement 100A is automatically completed (upper and lower unit connection process).

According to this reinforcement method, it is possible to eliminate the trouble of further arranging the lower end main reinforcement 70 after assembling the lower unit 50A and the upper unit 60A, and it is possible to further arrange the beam reinforcement with higher efficiency. It can be performed.

Further, also in the formed beam bar 100A, since the upper horizontal bar 40A is arranged at the center position of the height L of the beam bar 100A, the bending strength at both ends of the beam can be reduced, and the bending can be performed. It is a beam reinforcement used to form a beam that precedes destruction.

It should be noted that the configuration or the like described in the above embodiment may be another embodiment in which other components are combined, and the present invention is not limited to the configuration shown here. This point can be changed without departing from the spirit of the present invention, and can be appropriately determined according to the application form thereof.

10: First beam muscle 11: Bottom muscle part 12: Standing muscle part 20: Second beam muscle 21: Top end muscle part 22: Dripping muscle part 30: Upper beam main muscle 40: Lateral muscle 40A: Upper horizontal muscle 40B: Lower part Horizontal bar 50, 50A: Lower unit 60, 60A: Upper unit 70: Lower end main bar 100, 100A: Beam bar

Claims (5)

The first stirrups, which have a U-shape that opens upward and have a bottom muscle portion and a rising muscle portion that rises upward from the left and right ends of the bottom muscle portion, are arranged at a predetermined pitch, and each of the first stirrups is arranged. A lower unit in which the stirrups are connected to the upper end main bar by full-strength welding inside the upper end of the corresponding rising bar on the left and right.
A second stirrup muscle that has a U-shape that opens downward and has a crown muscle portion and a drooping muscle portion that hangs downward from the left and right ends of the crown muscle portion and extends to the bottom muscle portion is specified. The second stirrups are connected to each other by welding at predetermined positions on the outside of the corresponding left and right sagging muscles by two-stage horizontal streaks, and are connected to the ends of the sagging muscles. Consists of an upper unit that does not have a hook,
A beam bar is formed by connecting the lower end main bar to the inside of the bent portion at the boundary between the bottom bar portion and the rising bar portion forming the first stirrups.
In a state where the upper unit is covered with the lower unit, the rising muscle portion of the corresponding first stirrup muscle and the sagging muscle portion of the second stirrup muscle wrap, and the lateral streaks of the two steps. Among them, the upper horizontal bar is arranged at the center position of the height of the beam bar, and the lower horizontal bar is arranged on the side of the bottom bar or the side of the lower end main bar. Beam bars. The beam reinforcement according to claim 1, wherein the beam formation is applied to a beam having a thickness of 500 mm or less. The beam bar according to claim 1 or 2, wherein the two-stage horizontal bar is connected by full-strength welding on the outside of the droop bar portion. The first stirrups, which have a U-shape that opens upward and have a bottom muscle portion and a rising muscle portion that rises upward from the left and right ends of the bottom muscle portion, are arranged at a predetermined pitch, and each of the first stirrups is arranged. A lower unit installation process in which the stirrups are arranged inside the upper ends of the corresponding rising muscles on the left and right by connecting the lower units to the upper end main bars by full-strength welding.
A second stirrups, which have a U-shape that opens downward and have a crown muscle portion and a drooping muscle portion that hangs downward from the left and right ends of the crown muscle portion, are arranged at a predetermined pitch, and each first An upper unit in which the two stirrups are connected by welding at predetermined positions on the outside of the corresponding left and right sagging muscles by two-stage horizontal streaks and does not have a hook at the end of the sagging muscles. , The lower unit is covered with a reinforcing bar, and the rising muscle portion of the corresponding first stirrups and the sagging muscle portion of the second stirrup are wrapped, and the upper part of the two lateral muscles is wrapped. The upper and lower unit connecting steps in which the horizontal bar is arranged at the center position of the height of the beam bar and the horizontal bar in the lower stage is arranged and connected to the side or the vicinity of the bottom bar portion.
Arrangement of beam bars, which comprises a lower end main bar connecting step of connecting the lower end main bar to the inside of the bent portion of the boundary between the bottom bar portion and the rising bar portion forming the first stirrups. Muscle method. The first stirrups, which have a U-shape that opens upward and have a bottom muscle portion and a rising muscle portion that rises upward from the left and right ends of the bottom muscle portion, are arranged at a predetermined pitch, and each of the first stirrups is arranged. The stirrups are connected to the upper end main bar by full-strength welding inside the upper end of the corresponding rising bar on the left and right, and the lower end main bar is welded inside the boundary between the bottom bar and the rising bar. The lower unit installation process, which arranges the connected lower units, and
The second stirrups, which have a U-shape that opens downward and have a crown muscle portion and a drooping muscle portion that hangs downward from the left and right ends of the crown muscle portion, are arranged at a predetermined pitch, and each first An upper unit in which the two stirrups are connected by welding at predetermined positions on the outer side of the corresponding left and right sagging muscles by two-step horizontal streaks and does not have a hook at the end of the sagging muscles. , The lower unit is covered with a reinforcing bar, and the rising muscle portion of the corresponding first stirrups and the sagging muscle portion of the second stirrups are wrapped, and the upper part of the two lateral muscles is wrapped. The upper and lower unit connecting steps in which the horizontal bar is arranged at the center position of the height of the beam bar and the lower horizontal bar is arranged and connected to the side of the bottom bar or the side of the lower end main bar. A method of arranging beam reinforcements, which comprises having.

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