JP2648798B2 - Column and beam joint structure of concrete structure and its construction method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a joint structure between a column and a beam in a concrete structure and a method for constructing the joint structure.

"Conventional technology and its problems" For example, when building a reinforced concrete structure,
Conventionally, the reinforcing bars at the joints of columns and beams are generally assembled on site.

However, the work of arranging the joint between the column and the beam in such a site is extremely troublesome because the work is required in a narrow place, and it is difficult to secure the accuracy (for example, the arrangement interval of the shear reinforcement). The improvement was awaited.

By the way, as a rebar arrangement alternative to on-site assembly,
A plurality of column main bars or beam main bars are bound by shear reinforcing bars (such as stirrups or stirrups) and assembled into a unit (column structural member, beam structural member) having a predetermined size. There is a construction method for constructing a column and a beam of a building while reassembling units of a column and a beam.

To explain an example of the work procedure of such a construction method, first, the upper end of the column structural member built at the construction position is not bound, and then, at this upper end, two beams are coplanar. Pre-assembled to be orthogonal to each other,
The connection unit of the main beam is suspended upward by a crane or the like. Then, the position of the connection unit of the beam main reinforcement suspended by a crane or the like is set so that the column main reinforcement and the beam main reinforcement intersect each other, and the column main reinforcement penetrates a gap formed by the beam main reinforcement. After adjusting and gradually descending, and lowering the connection unit of the beam main reinforcement to a predetermined position, the position is fixed by each main reinforcement and auxiliary reinforcement. In this way, the column main reinforcement is arranged between the plurality of beam main reinforcements.

Thereafter, the beam structural member is connected and arranged in the horizontal direction to the connection unit of the beam main reinforcement, and each main reinforcement is connected by a joint. By repeating this, columns and beams of the reinforced concrete structure are constructed.

However, even with such a construction method, there is room for improvement in the following points, for example.

When arranging a column main bar between a plurality of beam main bars, the column main bar and the beam main bar are assembled so that the column main bar penetrates the gap formed by the beam main bar. If there is, it is difficult for the connection unit of the beam main bar to drop to the predetermined position.

Since the upper end of the column main bar penetrates the gap formed by the beam main bar, it takes a long time to adjust the position of the connection unit of the beam main bar, and the danger to the worker who adjusts the position increases.

The present invention has been made in view of the above circumstances, and provides a joint structure between a column and a beam in a concrete structure and a method for constructing the same, which can perform a reinforcing work of a joint between a column and a beam in a short time and with high accuracy. The purpose is to provide.

[Means for Solving the Problems] Accordingly, the joint structure according to the first aspect of the present invention is arranged such that a shear reinforcement is provided at a connection portion where the beams are connected and assembled by a plurality of pillar reinforcements and a plurality of shear reinforcements. A shear reinforcing bar is attached to the outside of a pair of upper and lower beam units that are formed by connecting column structural members that are opened without opening, and a plurality of beam main bars arranged side by side in horizontal and horizontal directions at intervals. Structural members for beams,
A plurality of joint members which are set at predetermined positions of the column structural member and connect the beam structural members in an axial direction perpendicular to the longitudinal direction of the column structural member, and wherein the joint member includes the beam A pair of upper and lower beam connection main bars arranged along the upper and lower beam main bars of the structural member for connection and connected to the beam main bars at both ends thereof, and a plurality of connections arranged at intervals between these beam connection main bars The joint member is inserted into the opening of the column structural member, and upper and lower beam main bars of the beam structural member are connected to both ends of the joint member. The length dimension of the beam connecting main bar in the member is set so that when inserted into the opening of the column structural member, both ends protrude to both sides of the column structural member, and the distance between the upper and lower beam connecting main bars is , The spacing of the beam bars that are vertically spaced Characterized in that it is substantially equal to. It is preferable that the column main bar, the beam main bar, the shear reinforcing bar, the beam connecting main bar, and the connecting bar are each formed by solidifying continuous fibers with a resin material.

Further, the construction method of the second invention pre-assembles a column structural member that is opened without a shear reinforcing bar being arranged at a connection portion composed of a column main reinforcing bar and a shear reinforcing bar and connected to a beam. A joint formed in a trapezoidal shape by arranging a plurality of connecting bars at intervals between a pair of upper and lower beam connecting main bars extending in the length direction of the beam, Forming a plurality of members, inserting and setting the joint member into the opening of the column structural member, and arranging a plurality of beam main reinforcing bars at both ends of these joint members at horizontal and horizontal intervals. Connecting a beam structural member having a shear reinforcing bar attached to the outside of a pair of upper and lower beam units integrated by connecting bars.

According to the present invention, it is possible to position the set position of the beam structural member by a simple operation of erecting the column structural member and inserting the joint member between the main bars of the column, and the beam can be positioned via these joint members. Since the structure for use can be joined, the workability and safety at the site can be improved, and the construction period can be shortened.

Also, the joint member has a planar shape in which the upper and lower beam connecting main bars are integrated in a ladder shape by connecting bars, and the beam structural member is also a planar structure in which the beam main bars are integrated in a parallel state by connecting bars. Since they are mainly formed of a pair of upper and lower beam units having various shapes, they are all lightweight and bulky, and are advantageous for handling during transportation and construction.

In addition, if each component (column main bar, beam main bar, shear reinforcing bar, beam connecting main bar, connecting bar, etc.) has a structure in which continuous fiber is covered with resin, the structural members for columns and beams can be reduced in weight. This is preferable because workability at the site can be further improved.

"Example" Hereinafter, a joint structure between a column and a beam in a concrete structure according to the present invention and a method of constructing the same will be described with reference to Figs. 1 to 8 according to a construction order. In addition,
In one embodiment, an example in which the present invention is applied to the case where a joint located between a pillar located at the center of the inside of a structure and a beam connected to the pillar is constructed.

(I) Formation of pillar and beam structural members and joints In the drawings, reference numeral 1 denotes a pillar structural member, 2 denotes a beam structural member, and 3 denotes a joint member.

The plurality of pillar structural members 1 extend in the up-down direction and are arranged side by side so as to be located on the sides of a square (16 in this embodiment).
The main bar 4 of the book) and the plurality of shear reinforcing bars 5 surrounding the column main bar 4 are assembled to a length equivalent to, for example, the height of one layer of the building, and the beam structural member 2 is connected. The shear reinforcement 5 is opened at the connection portion without being provided. A connecting fastener (for example, a sleeve joint) is attached to the upper and lower ends of the column structural member 1, and the column structural member 1 having the same configuration is connected above and below the connecting fastener. ing.

The beam structural member 2 is a lattice-shaped beam unit in which a plurality of beam main reinforcements 6 extending in the length direction of the beam and arranged in parallel at intervals in the width direction are held at a constant interval by a plurality of connection reinforcements 7. 2a, and a ring-shaped shear reinforcing bar 8 wound around the outer periphery of the beam unit 2a. In addition, in the case of the embodiment shown in FIGS.
Is mounted without being fixed to the outside of the beam unit 2a, and is arranged at fixed intervals in a lateral direction after the beam structural member 2 is joined to the joint member 3; It is fixed and integrated. In addition, the beam structural member 2 has a lap joint length L at both ends and is configured to be connected to the joint member 3 as a lap joint.

Next, a joint member 3 for joining the beam structural member 2 to the column structural member 1 will be described. As shown in FIG. 1 and FIG. It is inserted into the opening between the main bars 4 and connected to the beam main bars 6 above and below the beam structural member 2. In one embodiment, a plurality of (12 in the illustrated example) joint members 3 are used for the column structural member 1. Arranged in two axial directions perpendicular to the length direction, the beam structural members 2 are connected to be orthogonal to each other. In addition,
As shown in FIG. 1, the joint members 3 arranged in directions perpendicular to each other are changed in their widths l ₁ and l ₂ so that they do not interfere with each other inside the column structural member 1. .

Further, a specific configuration of the joint member 3 includes a pair of upper and lower beam connecting main bars 9 arranged along the upper and lower beam main bars 6 of the beam structural member 2 and connected to the beam main bars 6, respectively. A plurality of connecting bars 10 arranged at intervals between the beam connecting main bars 9 form a ladder shape. The beam connecting main reinforcement 9 has its own length dimension so that both ends protrude to both sides of the column structural member 1.

Here, the main reinforcing bars 2, 6, 9 constituting the column structural member 1, the beam structural member 2, and the joint member 3, the shear reinforcing bars 5, 8, and the connecting bars 7, 10 are shown in FIG. 7 and FIG. As shown in FIG. 8, a plurality of continuous fibers 21 bound by a resin material 20
A fiber bundle T made of a material is used as a material, and is formed by solidifying the material. More specifically, taking the column structural member 1 as an example, a fiber bundle T composed of a plurality of aligned continuous fibers 21 is three-dimensionally arranged to form the column main reinforcing bar 4, and is reinforced by shearing. The cross section is formed by the streaks, and the fibers 21 of the fiber bundle T are bound by the resin material 20.

The intersection of the fiber bundles T (the intersection of the column main reinforcement 4 and the shear reinforcement 5) includes a fiber group extending in one direction,
As shown in FIG. 7, a fiber group extending in a direction orthogonal to this has a cross-sectional shape in which three or more layers are alternately laminated.

In addition, since these basic structures are the same also about the structural member 2 for beams and the joint member 3, description about these is abbreviate | omitted.

Column structural member 1, beam structural member 2, joint member 2
As the continuous fiber 21 that forms the main component, glass fiber or carbon fiber having light weight and high strength is suitable, but if necessary, other fibers such as synthetic resin fiber, ceramic fiber, and metal fiber are used. Is also good. These fibers may be used in an appropriate combination.

As the resin material 20 for binding the continuous fibers 21 of the fiber bundle T, for example, a vinyl ester resin having good adhesiveness to the continuous fibers 21 and itself having sufficient strength is preferably used. Another resin material may be used in accordance with the type of the continuous fiber 21. As other resin materials, unsaturated polyester resin, epoxy resin, phenol resin and the like can be mentioned.

The ratio between the resin material 20 and the continuous fibers 21 is appropriately determined in consideration of the type and strength of the continuous fibers 21 and the usage of the structural members 1 and 2 and the like.
When 11 is a glass fiber and the resin material 20 is a vinyl ester resin, the volume of the fiber 21 is about 30 to 70%, and when the fiber 21 is, for example, a carbo fiber, it is about 20 to 60%. It is desirable to consider. When the ratio of the continuous fibers 21 is equal to or less than the above, the strength of the structural member 1 is significantly reduced. On the other hand, when the ratio of the continuous fibers 21 is increased, a reinforcing member having high strength is obtained. Then, a relatively expensive material such as carbon fiber is not preferable in terms of economy.

In order to form the column structural member 1, the beam structural member 2, and the joint member 3 as described above, for example, the column structural member 1
In the case of the above, the continuous fibers 21 impregnated with a resin (for example, a cold-setting fluid resin) are hooked on pins or the like provided at positions corresponding to the upper and lower ends of the pillar main bars in a so-called one-stroke manner. Then, continuous fibers 21 impregnated with resin are wound at positions corresponding to the shear reinforcing bars. Then, at these intersections, the fiber groups are always alternately overlapped by at least three or more layers. At this time, it is necessary to apply sufficient tension to the continuous fiber 21 to maintain the linearity.

Here, the supply of the continuous fibers can of course be performed manually, but a method is adopted in which the passage order is automatically executed by mechanical means that operates based on a preset program.

Further, the distance between the column main reinforcements 4 or the distance between the shear reinforcing bars 5 constituting the column structural member 1 is determined by the size of the column to be constructed, the required strength, and the like. Twisted cords and braids are also included.

The manufacturing method of the beam structural member 2 and the joint member 3 and the like is performed in the same manner as the column structural member 1.

(Ii) Installation and Fixing of Column Structural Member As shown in FIG. 1, the column structural member 1 assembled by the column main reinforcement 4 and the shear reinforcement 5 is erected at a predetermined construction position. At this time, the pillar structural member 1
Since the continuous fiber 21 is made by solidifying the continuous fiber 21 with the resin material 20, it is extremely lightweight and easy to handle during transportation, so that it can be constructed manually without using a crane or the like.

The position where the beam structural member 2 is set is determined in advance by the first
As shown in the drawings and the like, the shear reinforcement 5 is opened without being wound, so that the joint member 3 can be inserted.

(Iii) Set of joint members Next, as shown by an arrow A in FIG. _1, a large joint member 3 having a width l ₁ is projected to both sides of the column structural member 1 through an opening between the column main reinforcements 4, and It is fixed to the column structural member 1 and is wider than the fixed joint member 3.
l Insert and fix the _two small joint members 3 as shown by arrow B. As a result, a connection structure that joins the beam structural member 2 in two axial directions perpendicular to the length direction of the column structural member 1 is set in the column structural member 1 (see FIG. 2). ). At this time (when the joint member 3 is inserted), the beam connecting main reinforcement 9 is formed of a plurality of continuous fibers bound by a resin material, so that it is easy to bend a little and the insertion operation is performed. Since the joint member 3 itself has a lightweight structure in which the continuous fibers 21 are bound by the resin material 20, the joint member 3 itself has advantages such as good construction on site. . Also,
The plurality of beam connecting main bars 9 constituting the joint member 3 are connecting bars 10.
And the beam connecting main bars 9 are fixed in a vertically separated state in accordance with the interval of the beam main bars 6,
The installation and positioning of the beam connection main reinforcement 9 can be easily performed.

In addition, it is preferable to attach a shear reinforcing bar after the insertion of the joint member 3 to the position of the column structural member 1 into which the joint member 3 is inserted, if necessary.

(Iv) Construction of structural members for beams And between the structural members for columns 1 built adjacently,
The beam structural member 2 is bridged, and the main beam 6 of the beam structural member 2 is joined to the joint member 3. This joining is performed according to the following procedure.

That is, the upper and lower beam units 2a formed in advance are carried into the site, and the ring-shaped shear reinforcement 8 is attached to the outside thereof at the site. 4 and 5, the beam connecting main reinforcement 9 of the joint member 3 attaches the beam main reinforcement 6 of the beam unit 2a, and binds them together. At this time, if the upper and lower beam units 2a are integrally assembled with connecting bars or the like, the assembling of the beam structural member 2 is simplified, and the workability thereof can be further improved. However, if the upper and lower beam units 2a were previously integrated, they would be bulky and heavy, and would be inconvenient to carry on to the site. This should be done just before construction. In addition, the connection form between the beam connection main reinforcement 9 of the joint member 3 and the beam main reinforcement 6 of the beam structural member 2 is such that the beam main reinforcement 6 is located outside the connection main reinforcement 9 as shown in FIG. Place them symmetrically,
Note that this connection form is not limited to the illustrated example.

Then, the shear reinforcing bars 8 on the outer periphery of the beam unit 2a are moved as shown by arrow C in FIG. 4 to position them with a certain interval therebetween, and adhere to the outer periphery of the beam unit 2a.

In the above operation, all the components (the beam unit 2a, the shear reinforcement 8, etc.) forming the beam structural member 2 are connected to the continuous fiber 21.
Is formed as a material, the beam unit 2a can be easily joined to the joint member 3 by human power,
In addition, the fixing of the shear reinforcement 8 can be easily performed.

As a method of connecting the beam unit 2a to the joint member 3 or the shear reinforcing bar 8, for example, the beam unit 2a may be bound using a binding iron wire or the like used in the conventional reinforcing work.

After joining the beam structural member 3 to the column structural member 1 in this manner, the formwork is assembled on the outside thereof, and then concrete is poured into the formwork to integrally form the column and the beam. Can be cast. In the above, by reducing the size of the mesh between the column main reinforcement and the shear reinforcement 5, it is also possible to omit the formwork of the column structural member 1 and to cast concrete of the column. .

The joint between the column and the beam is constructed as described above. In this construction method, the joint can be extremely easily performed. That is, since each member has a lightweight structure formed by binding and forming the continuous fiber 21 with the resin material 20, the setting work of the beam structural member 1 and the like can be performed manually without using a crane or the like. This is because it can be easily implemented. Moreover, these joining operations are simple operations of inserting the joint member 3 into the column structural member 1 and fixing the beam structural member 2 via the joint member 3.
Further, since the column main reinforcement 4, the beam main reinforcement 6, and the like are all unitized in advance, the workability and transportability at the site are good, and the joining operation can be easily performed. In particular, joint member 3
Is a flat ladder, and the beam structural member 2 is formed mainly of the flat beam unit 2a.
Compared to a case where they are formed three-dimensionally, they are not sufficiently light and bulky, and are therefore advantageous for transportation to the site and handling during construction.

Further, since each of the members (the column structural member 1, the beam structural member 2, and the joint member 3) has a structure in which the continuous fibers 21 are covered with the resin material 20, the fibers which are the main strength members are It has high corrosion resistance and is extremely advantageous as a structural material. Further, since the surface is formed of a resin as described above, there is an advantage that rough surface processing for improving adhesion to concrete can be easily performed.

In the above-described embodiment, the pillar structural member 1 is described as having a size corresponding to the height of one layer of the building. However, the pillar structural member 1 is reduced in size to two or three layers. It is also possible to assemble it, and it is also easy to erect the joint member 3 after attaching it to the pillar structural member 1 in advance. With such a configuration, it is possible to further shorten the construction period.

FIG. 6 shows another embodiment of the joint construction method of the present invention. In the above embodiment, the shear reinforcing bars 8 are only attached without being fixed to the outer sides of the upper and lower beam units 2a, and in some cases, are integrated by connecting bars immediately before the upper and lower beam units 2a are erected. In the present embodiment, when the beam structural member 2 is erected, the other shear reinforcing bars 8 are connected to the upper and lower beam units except for the shear reinforcing bars 8 located at the lap portion (lap joint portion) with the joint member 3.
2a, the upper and lower beam units 2a are integrated by the shear reinforcing bars 8 and then erected. However, as in the case of the above-described embodiment, if such integration is performed in advance, it is inconvenient to carry it into the site, so the integration should be performed immediately before installation.

In this case, as a work procedure, first, the joint member 3 is inserted into one of the adjacent column structures 1 (right side in FIG. 6), the beam structural member 2 is fitted into the joint member 3, and then, After inserting the joint member 3 into the other adjacent column structural member 1, the beam structural member 2 is fitted into the joint member 3 from above as shown by arrow d, and these are united together. Then, after setting the shear reinforcing bars 8 at a predetermined interval on the wrap portion, the shear reinforcing bars 8 are set.
Are united.

According to such a construction method, since the beam structural member 2 can be joined to the pillar structural member 1 in a state where most of the beam structural member 2 is formed, on-site work can be simplified and the accuracy can be improved. .

In each of the above-described embodiments, the pillar structural member 1, the beam structural member 2, the joint member 3, and the like are formed by hardening fibers with a resin material. However, in the present invention, these materials are the same as those of the embodiment. It is not limited, and for example, like the structural member 1 for a pillar shown in FIG.
The shear reinforcing bars 5 etc.) may be constituted by a reinforcing bar or the like. Similarly, a structural member for a beam and a joint member may be configured using a reinforcing bar.

[Effects of the Invention] As described above, in the joint structure between a column and a beam according to the first invention, a shear reinforcement is provided at a connection part where the beam is connected by being assembled by the plurality of column main reinforcements and the plurality of shear reinforcements. A shear reinforcing bar is attached to the outside of a pair of upper and lower beam units that are formed by connecting column structural members that are opened without disposing them, and a plurality of beam main bars that are arranged side by side in horizontal and horizontal directions and connected by connecting bars. A beam structural member, comprising a plurality of joint members that are set at predetermined positions of the column structural member and connect the beam structural member in an axial direction perpendicular to the longitudinal direction of the column structural member, In addition, the joint member is disposed along the upper and lower beam main reinforcements of the beam structural member, and a pair of upper and lower beam connection main reinforcements to which beam main reinforcements are connected at both ends thereof, and a space between these beam connection main reinforcements. Ladder with a plurality of connecting bars arranged in a space The joint member is inserted into the opening of the column structural member, and upper and lower beam main bars of the beam structural member are connected to both ends thereof, respectively. The length dimension is set so that when inserted into the opening of the pillar structural member, both ends protrude to both sides of the pillar structural member, and the interval between the upper and lower beam connecting main bars is vertically separated Since the beam spacing is set to be almost equal to the beam main bar, the beam structural member can be easily and firmly joined to the column structural member with high construction accuracy, and the on-site construction work can be easily performed. There is an effect that can be done.

In the construction method according to the second aspect of the present invention, the column structural member that is opened without the shear reinforcement being provided at the connection part formed of the column main reinforcement and the shear reinforcement and connected with the beam is previously assembled. And a plurality of connecting bars are arranged at intervals between a pair of upper and lower beam connecting main bars extending in the length direction of the beam, and are configured in a ladder shape. Forming a plurality of joint members, inserting the joint members into the openings of the column structural members, and setting the joint members; and arranging a plurality of beam main reinforcing bars at both ends of the joint members at horizontal and horizontal intervals. Connecting a beam structural member having a shear reinforcement attached to the outside of a pair of upper and lower beam units integrated by connecting bars. The set position can be determined and the joint member Through can be joined to the beam for structure, the site in the workability and can improve the safety and the like, it is possible to shorten the construction period.

In particular, in both the first invention and the second invention,
The joint member has a trapezoidal shape with a planar shape in which a pair of upper and lower beam connecting main bars are integrated by connecting bars, and a planar shape in which the beam structural member is integrated in parallel with the beam main bars by connecting bars. Because it was formed mainly of the beam unit of
These joint members and beam units are lightweight and non-bulk, and have the advantage that they can be easily transported and handled.

In addition, if each component (column main bar, beam main bar, shear reinforcing bar, beam connecting main bar, connecting bar, etc.) has a structure in which continuous fiber is covered with resin, the structural members for columns and beams can be reduced in weight. This is preferable because workability at the site can be further improved.

[Brief description of the drawings]

1 shows an embodiment of the present invention, FIG. 1 is an exploded perspective view of a column structural member and a joint member, FIG. 2 is a perspective view showing a state where they are assembled, and FIG. 4 is a side view, FIG. 5 is a plan view showing a connecting portion between a beam structural member and a joint member, and FIG. 6 is a view showing another construction method of the present invention. FIG. 7 is a cross-sectional view at the intersection of fiber bundles, FIG. 8 is a cross-sectional view of fiber bundles, and FIG. 9 is a perspective view of a structural member for a pillar made of a reinforcing bar. FIG. DESCRIPTION OF SYMBOLS 1 ... Structural member for column, 2 ... Structural member for beam, 3 ... Joint member, 4 ... Main bar of column, 5, 8 ... Shear reinforcing bar, 6 ... Main bar of beam, 7 ... Connecting bar, 2a ... Beam unit, 9 ... Beam connection main reinforcement, 20 ... resin material, 21 ... continuous fiber, T ... fiber bundle.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tadashi Fujisaki 2- 16-1, Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. Construction Co., Ltd. (56) References JP 62-1061 (JP, B2)

Claims (3)

(57) [Claims] 1. A structural member for a column, which is opened without a shear reinforcement being provided at a connection portion where a beam is connected and assembled by a plurality of pillar reinforcements and a plurality of shear reinforcements, and a plurality of beam reinforcements. A beam structural member comprising a pair of upper and lower beam units integrated by connecting bars arranged side by side in parallel at horizontal horizontal intervals, and a shear reinforcing bar attached to the outer side, and set at a predetermined position of the column structural member. And a plurality of joint members for connecting the beam structural members in an axial direction perpendicular to the length direction of the column structural members, and the joint members are arranged along main beam bars above and below the beam structural members. And a pair of upper and lower beam connecting bars connected at both ends to the beam connecting bars, and a plurality of connecting bars arranged at intervals between the beam connecting bars. , The joint member is the column structural member The upper and lower beam main bars of the structural member for beams are connected to both ends thereof at the ends thereof, and the length dimension of the beam connecting main bar in the joint member is inserted into the opening of the structural member for columns. The concrete is characterized in that both ends thereof are set so as to protrude to both sides of the column structural member, and an interval between upper and lower beam connecting main bars is set substantially equal to an interval between beam main bars which are vertically separated. Column and beam joint structure in a structure. 2. The column main bar, the beam main bar, the shear reinforcing bar, the beam connecting main bar, and the connecting bar are each formed by forming continuous fibers from a resin material. A joint structure between a column and a beam in the concrete structure according to claim 1. 3. A structural member for a column, which is composed of a column main reinforcing bar and a shear reinforcing bar and is connected to the beam and has no shear reinforcing bar, is opened in advance without being provided with a shear reinforcing bar. Erecting step, and forming a plurality of ladder-like joint members by arranging a plurality of connecting bars at intervals between a pair of upper and lower beam connecting main bars extending in the length direction of the beam. A step of inserting the joint member into the opening of the column structural member and setting the same; and a plurality of beam reinforcing bars are arranged at both ends of these joint members in parallel with a horizontal space therebetween and integrated by connecting bars. Connecting a beam structural member having a shear reinforcing bar attached to the outside of the pair of upper and lower beam units.