JPH11141134A - Beam rib reinforcing cage, fitting for beam reinforcing bar, and assembling method of beam reinforcing bar - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the reinforcing bar assembling working of the upper story floor beam of a reinforcing bar concrete building. SOLUTION: Rib reinforcing bars 1 are vertically arranged at proper intervals, vertically arranged rib reinforcing bars 1 are welded and connected to auxiliary vertical levers 2 to make the whole a cage, a lower main bar fitting part is provided on the lower bar part of the proper rib reinforcing bar 1, and a beam reinforcing bar cage A providing a mounting part for a mounting horizontal lever 4 is formed on a part near upward of right and left side bar parts. The reinforcing bar cage A is disposed in a beam form, a lower vertical main bar 3 is fitted to a fitting part, an upper vertical main bar 5 is mounted on the mounting lever 4 for mounting stretched to the mounting part, and the connection of the upper vertical main bar 5 for an upper horizontal main bar is made easy.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel cage used as a reinforcing bar to be assembled on a floor beam on an upper floor when building a building made of reinforced concrete, a metal fitting used for assembling a beam reinforcing steel, and the above-mentioned steel reinforcing basket and metal fitting. The present invention relates to a method of assembling a beam reinforcing bar to be used.

[0002]

2. Description of the Related Art An upper floor of a building made of reinforced concrete is constructed by forming a floor form formed at a position to be a bottom surface of an upper floor plate and a groove-shaped beam from the floor form to a floor beam forming portion. Forming a formwork, incorporating a beam reinforcement in the beam formwork, connecting the upper part of the beam reinforcement with the floor reinforcement, and forming the groove formwork (beam formwork) and the floor formwork. It is made by casting concrete.

As shown in FIG. 13, a beam reinforcing bar to be incorporated in the above-described beam formwork has a U-shaped rib reinforcing bar 01 having an upper opening positioned slightly inside the short outer surface of the formwork. The upper horizontal main reinforcing bar 02 and the upper and lower vertical main reinforcing bars 0
3, 04 are bound to the above-mentioned rectangular reinforcing bar set with a wire or the like. As described above, the installation of the beam reinforcing bar is a complicated operation. For example, in order to facilitate the mounting of the bar reinforcing bar 01, it is also possible to connect the parallel bar reinforcing bars 01 with the auxiliary vertical rods 05 so as to form the entire cage. Have been done.

[0004] In addition, in order to make the reinforcing bars in a cage shape, Japanese Patent Publication No. 4-5
As shown in Japanese Patent No. 4786, the reinforcing bars are connected to each other by auxiliary vertical rods to form a cage, and the reinforcing bars are arranged only by installing the cage in the formwork. Improve work efficiency. Further, as disclosed in Japanese Patent Application Laid-Open No. 59-8873, there is a means in which a receiving jig for a lower vertical main bar is provided in a lower bar portion of a rib bar to omit the connection between the lower vertical bar and the bar bar. It is shown.

[0005] When the width of the beam is narrower and sufficient strength cannot be obtained, the lower vertical main reinforcing bar may be a two-tiered upper and lower bar. After placing and binding the lower lower vertical main reinforcement 04a, the horizontal mounting rod 06 is inserted between the side reinforcing bars 01 slightly above the lower lower vertical main reinforcement 04a, and the upper lower vertical reinforcement is placed on the horizontal mounting rod 06. The main muscle is incorporated.

[0006]

The above-mentioned other conventional simplification means have advantages and disadvantages. That is, in the case of a cage shape, it is necessary to perform the work of binding the lower vertical main reinforcing bar at the bottom of the groove-shaped formwork. In addition, by means of providing a jig for the lower vertical bar on the rebar, there is no need to tie the lower vertical bar,
Unless the rebars are placed at the proper positions in the formwork, the work of mounting the lower vertical bar is troublesome. In addition, if the lower longitudinal bars are installed before placing the reinforcing bars in the formwork, the problem of proper placement of the reinforcing bars can be solved. Since it is very complicated to carry and install the rebar and the lower vertical main bar so as not to be separated, it is necessary to shorten the length of one lower vertical main bar.

[0007] Further, when assembling the beam reinforcing bars, the work of binding the upper vertical reinforcing bars to the upper horizontal reinforcing bars includes placing the lower vertical reinforcing bars inside the area surrounded by the rib reinforcing bars and binding and connecting the upper horizontal reinforcing bars to the rib reinforcing bars. At this time, it is necessary to bind the lower vertical main muscle to the upper hook portion, and the upper vertical main muscle is largely pulled up from below, and this is a labor tying operation. Furthermore, even in the case where the lower vertical main bar is formed in a two-stage set, it is a very complicated operation to insert the horizontal mounting rods. Therefore, the present invention proposes a reinforcing bar cage that facilitates construction of a beam reinforcing bar and a method of assembling a beam reinforcing bar using the reinforcing bar cage.

[0008]

According to the present invention, there is provided a reinforcing rod cage for a beam, in which U-shaped reinforcing bars having an open upper portion are cascaded at appropriate intervals, and the arranging reinforcing bars are connected to an auxiliary vertical bar by welding. In addition, the whole is formed in a cage shape, and among the reinforced reinforcing bars arranged in a row, a short riser is welded to a lower reinforcing portion of an appropriate reinforcing bar to provide a lower main reinforcing bar fitting portion, and the upper reinforcing portion is located near the right and left side reinforcing portions. A mounting portion for a mounting horizontal rod is provided in the portion.

One of the methods of assembling a beam reinforcing bar according to the present invention is to place a base body in a grooved formwork assembled at a beam forming place, and place the above-described reinforcing bar cage on the base body to reinforce the reinforcing bar. Position the basket in the hollow inside the formwork, tightly fit the long lower vertical main bars to the fitting part of the reinforcing bar cage, and then pass the mounting horizontal rod to the mounting portion of the reinforcing bar cage. A plurality of upper vertical main bars are mounted on the horizontal bar, an upper horizontal main bar is erected and connected between upper hook portions of the ribs, and the upper vertical main bar mounted on the horizontal bar is connected to the hook portion and the upper horizontal main bar. It is characterized by being bound to.

Therefore, when the reinforcing bars are placed in the beam form only by arranging the reinforcing bars in a proper position, and the reinforcing bars are kept in a continuous state, the lower vertical main bars can be fitted to the fitting portions while keeping the length. After the lower vertical bar is attached to the rebar and the lower vertical bar is attached, the upper vertical bar can be placed by placing the horizontal bar on the placement section of the reinforcing bar, and the upper vertical bar is placed on the horizontal bar. In addition, the upper horizontal bar is connected between the upper hooks of the rebars, and the upper vertical bar is located near the upper horizontal bar, so that the upper horizontal bar can be easily bound and connected to the upper horizontal bar.

Further, the first beam reinforcing metal fitting according to the present invention comprises:
The connecting rods are installed vertically at both ends of the horizontal rods corresponding to the width of the ribs in the beam reinforcement, and the rods are frequently protruded downward at appropriate intervals on the horizontal rods to form the lower main reinforcement fitting part It is characterized by having done.

[0012] Further, a second beam reinforcing metal fitting according to the present invention includes:
At the same time as the width of the rib rebars in the beam rebar, the horizontal bars are arranged vertically in two steps at the intervals of the main bars, the connecting rods vertically installed at both ends of the horizontal bars, and the upper horizontal bars at appropriate intervals. An upper lower main bar fitting portion formed by protruding frequent rods, and a lower lower main bar fitting portion formed by protruding frequent rods downward at appropriate intervals in the lower horizontal rod portion. It is a feature.

A method of assembling a second beam reinforcing bar according to the present invention uses the above-mentioned metal fitting, and places a reinforcing bar basket in which rib bars are arranged in a column in a groove-shaped form assembled at a beam forming portion. Placed on the base body, the reinforcing bar is positioned in the hollow inside the formwork, a plurality of long lower longitudinal main reinforcing bars are mounted on the lower reinforcing portion in the reinforcing bar cage, the first metal fitting or the first Using the second bracket,
When each lower vertical bar of the metal fitting (lower lower vertical bar) is tightly fitted to the fitting part of the metal fitting, the metal fitting connecting rod part is tied to the side bar of the rib rebar, and when the second metal fitting is used, The upper lower main reinforcement is fitted to the fitting portion of the upper horizontal rod portion of the fitting, and thereafter, the upper horizontal main reinforcement and the upper vertical main reinforcement are incorporated.

Therefore, in incorporating the lower vertical bar,
Place them on the rebar and place them at regular intervals using metal fittings, and tie the connecting rods of the metal fittings to the side muscles. There is no need to tie it to a reinforcing bar, and the work efficiency is improved. In addition, when the lower vertical main reinforcement is incorporated into the upper and lower two-tiers, the use of the second metal fitting allows the connection work of the lower lower vertical main reinforcement to the rib rebars to simultaneously form the placement of the upper lower vertical main reinforcements. A very complicated two-column system can be easily performed.

[0015]

Next, an embodiment of the present invention will be described. <First Embodiment> The reinforcing bar cage 1 shown in the embodiment comprises a reinforcing bar 11, an auxiliary vertical rod 12, and an auxiliary mounting vertical rod (mounting portion) 13.
And the fitting portion 14 of the lower vertical main bar.

The rebar 11 has a U-shape with an open top, and the upper part of the side bar 111 is bent into a hook shape to form a hook 112. The rebars 11 are tandemly arranged at appropriate intervals. The lower strut 113 of the rebar 11 is welded and connected to the auxiliary vertical bar 12, and the auxiliary mounting vertical bar 13 is welded and connected to a portion near the upper part of the left and right side streaks 111, and the whole is in a cage shape. It is formed in. In addition, the fitting portion 14 is a rib reinforcing bar 1
1 is formed by welding a short rising streak 14a to the lower streak portion 113 of an appropriate one.

Next, an assembling method of the present invention using the above-described reinforcing bar 1 will be described in the order of the steps. Formwork for building an upper floor of a building made of reinforced concrete includes a floor form A formed at a position to be a bottom surface of an upper floor plate, and a groove-shaped beam from the floor form A to a floor beam forming portion. A beam form B is formed, and a reinforcing bar for a beam is incorporated in the beam form B. An appropriate base body 2 made of concrete, metal, synthetic resin or the like is located in the beam form. Then, the rebar basket 1 is placed on the base body 2, the rebar basket 1 is positioned in the hollow in the form B, and is made continuous over the entire length of the form.

Next, a plurality of lower vertical main reinforcing bars 3 having a length sufficiently longer than the length of the reinforcing rod cage 1 are closely fitted to the fitting portions 14 of the reinforcing rod cage 1 without binding the lower vertical main reinforcing bars 3. It is integrated with the basket 1. Auxiliary mounting vertical rods 13 on both sides of the reinforcing bar 1
A plurality of upper vertical main bars 5 are placed on the horizontal rod 4 with the mounting horizontal rod 4 extending therethrough.

The upper hook 1 of the rib reinforcing bar 11 of the reinforcing bar 1
Between 12, the upper horizontal main bar 6 having hooks 61 at both ends is connected and connected (by bundling), and the upper vertical main bar 5 previously mounted on the horizontal rod 4 is hooked to the hooks 112 and 61. It binds, and further binds and connects the remaining upper vertical main reinforcement 5 to an intermediate portion of the upper horizontal main reinforcement 6.

Therefore, in assembling the beam reinforcement, the reinforcement cage 1
, The positioning of the ribs 11 is easy and the form A
The lower vertical main bar 3 that needs to be connected at the bottom of the
And the upper vertical main reinforcing bar 5 is placed on the mounting horizontal rod 4, so that the upper horizontal main reinforcing bar 6 can be slightly lifted.
Can be easily implemented.

<Second Embodiment> The second embodiment is an example in which the width of the beam is wide. The above-described reinforced cage 1 is formed in advance so as to correspond to a normal beam cross section. However, when a wide beam is to be constructed, it is necessary to correspond to the width (size) of the beam. It is necessary to form a reinforced cage. However, it is troublesome to form a reinforcing rod cage by changing the width of the ribs. Therefore, the second embodiment is an assembling means that does not form a wide reinforcing bar even when constructing a wide beam.

In the second embodiment, as shown in FIGS. 5 to 7, the base body 2 is positioned in the wide beam form B1, and the two rebar baskets 1a and 1b are arranged side by side and on the side. Muscle 1
11 is located inside the other rebar basket 1, and the mounting positions of the upper and lower vertical main bars 3 and 5 (the fitting portion 14 and the hook portion 112).
Are placed on the base body 2 in the superimposed state with the same position (the part of the auxiliary vertical rods 12 and the auxiliary mounting vertical rods 13 are removed), and the wide formwork B1 It is located in the hollow. Thereafter, similarly to the first embodiment, the lower vertical main reinforcement 3 is closely fitted to the fitting portion 14, and the mounting horizontal rod 4 is passed over the auxiliary mounting vertical rods 13 on both sides, and the upper vertical main reinforcement 5 is inserted. Is placed on the horizontal rod 4, the upper horizontal main reinforcement 6 is erected and connected between the upper hooks 112, and the upper vertical main reinforcement 5 previously mounted on the horizontal rod 4 is bound and connected to the upper horizontal main reinforcement 6. Things.

Accordingly, even when the width of the beam to be formed cannot be accommodated by the width of the reinforcing bar cage 1, the beam reinforcing bar can be assembled by superposing the reinforcing bar cages 1 in parallel.

In the above-described embodiment, the mounting portion of the mounting horizontal rod is also used as the auxiliary vertical rod. However, a short side is provided at an appropriate side reinforcing bar of the parallel reinforcing bar corresponding to the position where the horizontal rod is mounted. The mounting rod may be formed by welding.

<Third Embodiment> FIGS. 8 and 9 show a third embodiment of the present invention. The third embodiment is an example using the first metal fitting of the present invention. The first beam reinforcing metal fitting 7 has a connecting rod portion 72 vertically installed at both ends of a horizontal rod portion 71 having a length corresponding to the width of the rib reinforcing bar 11 in the beam reinforcing bar 1c to be used. A frequent rod portion 73a protrudes downward at an appropriate interval in the middle of the above, and a fitting portion 73 for the lower main reinforcement 3 is formed below the horizontal rod portion 71.

The rebar basket 1c using the metal fittings 7 basically includes a reinforcing bar 11, an auxiliary vertical rod 12, and an auxiliary mounting vertical rod (mounting portion) 13, similarly to the first embodiment. The fitting portion 14 of the lower vertical main bar is not provided.

The assembling method of the present invention using the metal fitting 7 and the reinforcing bar 1c will be described in the order of the steps. As in the first embodiment, the rebar cage 1c is placed on the base body 2 in a groove-shaped beam form B formed at a location to be a floor beam on the upper floor, as in the first embodiment. Is positioned in the hollow space within the mold B, and is continued over the entire length of the mold. Then, a predetermined number of long lower vertical main reinforcing bars 3 are arranged in the reinforcing bar 1c,
The lower vertical main reinforcing bar 3 is tightly fitted to the fitting portion 73 of the metal fitting 7, the connecting rod portion 72 is tied to the side bar portion 111 of the rib reinforcing bar 11, and the lower vertical main reinforcing bar 3 is connected to the reinforcing bar cage 1c.

After that, the upper vertical main reinforcing bar 5 is assembled by, like the first embodiment, inserting the mounting horizontal rod 4 over the auxiliary mounting vertical rod 13 to connect the plurality of upper vertical main reinforcing bars 5 to the horizontal direction. Rod 4
The upper main bar 6 is placed and connected (by bundling) between the tops of the ribs 11 and the upper main bar 5 placed on the horizontal bar 4 is hooked to the hooks 112 and 61 and bound. In addition, the remaining upper vertical main reinforcement 5 is bound and connected to an intermediate portion of the upper horizontal main reinforcement 6.

Therefore, since the metal fittings 7 are used in assembling the beam reinforcing bar, after the reinforcing bar cage 1c is installed, the lower vertical main reinforcing bar 3 is simply positioned in the rib reinforcing bar 11, and
The lower vertical main reinforcing bar 3 can be connected to a predetermined position only by slightly adjusting the position of the lower vertical main reinforcing bar 3 to the left and right, and the fitting 7 can be mounted.

<Fourth Embodiment> FIGS. 10 to 12 show a fourth embodiment of the present invention. The fourth embodiment is an example using the second metal fitting of the present invention. The second beam reinforcing metal fitting 8 is a rib reinforcing bar 11 of the beam reinforcing bar 1c to be used.
A lower horizontal rod portion 81a and an upper horizontal rod portion 81b which are arranged in two upper and lower stages with a length corresponding to the width of the main bar (at least the diameter of the main bar (vertical main bars 3 and 5)); A connecting rod portion 82 vertically provided at both ends of the lower horizontal rod portion 81a, a fitting portion 84a for a lower lower main bar formed by projecting a frequent rod 83a downward at appropriate intervals on the lower horizontal rod portion 81a, and an upper horizontal rod portion 81b. And a fitting portion 84b for an upper lower main bar formed by protruding a frequent rod 83b upward at appropriate intervals.

When assembling the beam rebar, a predetermined number of vertical main bars are required in accordance with the strength in order to secure a predetermined strength. However, when the width of the beam is narrow, or when the strength is required as compared with the width, the lower vertical main reinforcing bar is formed as a two-tiered upper and lower column. The metal fitting 8 is a metal fitting used for this two-stage assembly.

The assembling method of the present invention using the metal fitting 8 and the reinforcing bar 1c will be described in the order of the steps. As in the third embodiment, the rebar cage 1c is placed on the base body 2 in a groove-shaped beam form B formed at a location to be a floor beam on the upper floor, as in the third embodiment. Is positioned in the hollow space within the mold B, and is continued over the entire length of the mold. Then, a predetermined number of long lower lower vertical main bars 3a are arranged in the reinforcing bar cage 1c, the lower lower vertical main bars 3a are closely fitted to the fitting portions 84a of the metal fittings 8, and the connecting rod portions 82 The lower vertical lower main bar 3a is connected to the reinforcing bar 1c by being linked to the side bar 111.
Furthermore, the upper lower vertical main reinforcing bar 3b is fitted tightly to the fitting portion 84b. Thereafter, similarly to the third embodiment, the upper vertical main reinforcing bar 5 is incorporated.

Therefore, when assembling the lower vertical main reinforcing bars in the upper and lower stages, it is possible to easily secure the interval between the lower vertical main reinforcing bars and as a beam reinforcing bar.

[0034]

As described above, according to the present invention, the rebars are tandemly arranged at appropriate intervals, and the arrested rebars are welded and connected to the auxiliary longitudinal rods to form a whole cage-like shape. A reinforcing bar cage for a beam, wherein a lower main reinforcing bar fitting portion is provided in a lower reinforcing bar portion of the reinforcing bar, and a mounting portion for a mounting horizontal bar is provided in a portion near above the left and right side reinforcing bar portions. In place of the above, it is a metal fitting for attaching the vertical main reinforcing bar, and the rib reinforcing bar is appropriately arranged only by disposing the reinforcing steel basket in the beam form by the method of assembling the reinforcing bar for the beam or the reinforcing bar using the fitting. Position, the lower vertical bar is simply connected to the rebar by simply fitting it into the fitting part formed in advance on the reinforcing bar cage or the fitting portion of the metal fitting, and furthermore, loading the reinforcing bar cage. When the horizontal bar for mounting is passed over the mounting part, the upper vertical main bar can be placed. When the upper vertical main bar is placed on the horizontal bar in advance, the upper horizontal main bar is Bundling connection of the upper longitudinal main reinforcement to is that it is possible to perform the assembly work of equal beam rebar efficiently which can be easily performed.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a main member of a first embodiment of a steel cage according to the present invention.

FIG. 2 is an explanatory view of a step by a beam cross section of the first embodiment of the present invention (arrangement of reinforcing bars).

FIG. 3 is an explanatory view (mounting of an upper vertical main bar).

FIG. 4 is an explanatory view (bundling of upper vertical main muscle).

FIG. 5 is an explanatory view (arrangement of a reinforcing rod cage) of a step in a beam section according to the second embodiment of the present invention.

FIG. 6 is an explanatory view (mounting of an upper vertical main bar).

FIG. 7 is an explanatory view (bundling of upper vertical main muscles).

FIG. 8 is an explanatory diagram of main members used in a third embodiment of the method of the present invention.

FIG. 9 is an explanatory view of the assembling step (mounting of a lower vertical main bar).

FIG. 10 is a front view of a fitting used in a fourth embodiment of the method of the present invention.

FIG. 11 is an explanatory view of the assembling process (placement of a lower vertical lower main bar).

FIG. 12 is an explanatory view of the assembling step (mounting of the upper vertical lower main bar).

FIG. 13 is an explanatory view for assembling a conventional beam reinforcing bar.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1a, 1b, 1c Reinforcing bar 11 Rebar bar 111 Side bar 112 Hook 113 Lower bar 12 Auxiliary vertical bar 13 Auxiliary placing vertical bar 14 Fitting portion 14a Standing bar 2 Base body 3 Lower vertical main bar 3a Lower lower portion Vertical main bar 3b Upper lower vertical bar 4 Mounting horizontal bar 5 Upper vertical main bar 6 Upper horizontal main bar 61 Hook 7 Metal fitting 71 Horizontal rod 72 Binding rod 73 Fitting 8 Metal fitting 81a Lower horizontal rod 81b Upper horizontal rod Part 82 Connecting rod part 84a, 84b Fitting part

Claims (8)

[Claims] [Claim 1] The lower rebars are raised on both sides to form a U-shape with an open upper part, and the rebars with the upper parts of the raised side rebars hooked are tandemly arranged at appropriate intervals. The reinforcing bars are welded and connected to the auxiliary vertical bars to form the entire cage, and a short riser is welded to the lower reinforcing portion of the appropriate reinforcing bars of the parallel reinforcing bars to fit the lower main reinforcing bars. A reinforcing bar for a beam, comprising a mounting portion for a horizontal mounting rod provided in a portion near an upper part of the right and left side streaks. 2. The reinforcing bar cage for a beam according to claim 1, wherein the side reinforcing portions of the reinforced ribs are welded to and connected to the auxiliary vertical bar, and the auxiliary vertical bar serves as a mounting portion for the mounting horizontal bar. 3. A rebar cage according to claim 1 or 2, wherein the rebar cage according to claim 1 or 2 is placed on the base body, and the rebar cage is hollowed in the mold frame. After positioning, a plurality of long lower vertical main bars are closely fitted to the fitting portion of the reinforcing bar cage, and then a horizontal bar for mounting is placed over the mounting portion of the reinforcing bar cage to form a plurality of upper vertical main bars. The upper main bar placed on the horizontal bar is connected between the upper hooks of the ribs, and the upper vertical bar placed on the horizontal bar is bound and connected to the hook and upper horizontal bar. A unique method of assembling beam reinforcement. 4. A groove-shaped formwork assembled at a beam forming point, wherein the reinforcing rod cages according to claim 1 or 2 are arranged in a side-by-side state and side bars are positioned inside the other reinforcing rod cage so as to be superposed. 4. The method of assembling a beam reinforcing bar according to claim 3, wherein the beam reinforcing bar is positioned in a hollow space inside. 5. A lower main reinforcing bar, wherein connecting rods are vertically provided at both ends of a horizontal bar corresponding to the width of a rib reinforcing bar in a beam reinforcing bar, and the horizontal bars are frequently protruded downward at appropriate intervals. A metal fitting for a beam reinforcing bar, wherein a fitting portion is formed. 6. A horizontal rod portion corresponding to the width of a rib reinforcing bar in a beam reinforcing bar and arranged in two stages in an upper and lower direction at intervals of a main reinforcing bar, a connecting rod portion vertically provided at both ends of the horizontal rod portion, and an upper horizontal rod portion. An upper lower main bar fitting portion formed by projecting frequent rods upward at appropriate intervals, and a lower lower main bar fitting portion formed by projecting frequent rods downward at appropriate intervals to the lower horizontal rod portion. A metal fitting for beam reinforcement, comprising: 7. A lower rebar having both sides raised to form a U-shape with an open upper part, and a plurality of rib-shaped rebars having a hook-shaped upper part of the raised side muscles are tandemly arranged at appropriate intervals. The rebar cage formed by welding the rebars to the auxiliary vertical rods and connecting them as a whole to a cage is placed on a base body placed in a groove-shaped formwork assembled at a beam forming place, and the rebar cage is removed. A plurality of long lower vertical main bars are placed on the lower reinforcing bar inside the reinforcing bar cage, and each lower vertical main bar is fitted with a metal fitting by using the metal fitting according to claim 5. A method of assembling a beam reinforcing bar, wherein the fitting bar is tightly fitted to the joint portion, and the fitting connecting rod portion is connected to the side bar portion of the rib bar, and thereafter, the upper horizontal bar and the upper vertical bar are incorporated. 8. A lower rebar having both sides raised to form a U-shape with an open upper part, and a plurality of rib-shaped rebars having the upper parts of the raised side muscles hooked are arranged at appropriate intervals. A reinforcing bar cage formed by welding a reinforcing bar to an auxiliary vertical rod and connecting the entire bar into a cage shape is placed on a base body positioned in a groove-shaped formwork assembled at a beam forming portion, and Is positioned in the hollow in the formwork, and a plurality of long lower lower vertical main reinforcing bars are placed on the lower reinforcing bar in the reinforcing bar cage, and the lower lower vertical main reinforcing bar is mounted using the metal fitting according to claim 6. Close fitting to the fitting part of the fitting, tie the fitting connecting rod part to the side streaks of the rib rebar, place the upper lower vertical main bar on the upper horizontal rod part of the fitting, and tightly fit the fitting part And thereafter, an upper horizontal main bar and an upper vertical main bar are incorporated.