JP5236152B2 - Method of joining precast concrete column beams - Google Patents

Description

  The present invention belongs to a technical field for building a precast concrete column (hereinafter abbreviated as PCa column) by joining a precast concrete beam (hereinafter abbreviated as PCa beam). The present invention relates to a method for joining precast concrete column beams that does not require any prestress due to pressure bonding, tightening, tension, or the like.

A wide variety of structures or methods are known and practically used for joining the PCa column beams constituting the structure.
For example, in Patent Document 1, a PCa beam having a sheath hole penetrating in the lateral direction is installed between PCa columns, and a tension steel material is inserted through the sheath hole provided in advance in the PCa column and the sheath hole of the PCa beam. A method of rigidly joining a PCa column beam by tensioning and fixing both ends of the steel for tensioning and introducing prestress into the beam is disclosed.

  Further, in Patent Document 2, the end beam of the composite beam in which the end beam of the reinforced concrete is integrated with the both ends of the reinforced beam is abutted on the side surface of the PCa column. After filling the gap of the grout material, the PC steel wire or PC steel rod is penetrated between the end beam and the column, and both ends thereof are tightened and tightened with nuts to introduce pre-stress into the beam. The structure which joins is disclosed.

In Patent Document 3, as shown in FIG. 9, a beam receiving bracket 101 is formed integrally with a PCa column 100, and a convex portion 201 at the end of the PCa beam 200 is supported by the bracket to support the beam 200. It is installed on the pillar 100. A PC steel wire 300 is embedded in the PCa beam 200 in advance, and an end portion of the PC steel wire 300 communicates with the PCa pillar 100 from the convex portion 201 of the beam or from the bracket 101 to give prestress. The system is designed to fix tension.
The conventional column beam joining structure and joining method are basically configured to rigidly join the column beam by introducing prestress due to tension or tightening.
JP 50-78115 A JP-A-6-200560 JP-A-9-53276

  However, in the conventional beam-column joining methods of Patent Documents 1 to 3, since prestress is introduced into the PCa beam, a fastener is attached to the end of a tension material such as a steel wire or a steel bar, and the beam is tightened and tensioned. It is necessary to carry out a troublesome and time-consuming special construction method for each of the many beam-column joints in the building. For this reason, a specialized worker is required, and the worker is burdened with a great deal of labor and man-hours. In addition, since many expensive members (fasteners and the like) for introducing prestress are required, there is a problem that costs increase.

  As shown in FIG. 9, the invention described in Patent Document 3 secures an effective indoor height by housing a beam receiving bracket 101 (jaw) provided on the PCa column 100 in the beam formation, It can be noted that the floor height is reduced. However, it is a method that can be implemented only for the PCa pillars installed in the outer peripheral part of the building, as well as the structure that introduces troublesome and time-consuming prestress. It is difficult to implement the PCa pillars, which are arranged in the center of the building, which join so-called orthogonal beams, because the PC steel wires prepared for the PCa beams on both sides are congested in the pillars.

The purpose of the present invention is to eliminate the need for prestressing due to tightening or tension in the case of PCa column beams, to save labor and simplify the construction method, and to shorten the construction period and cost It is to provide a method for joining precast concrete column beams.
The next object of the present invention is to provide a precast concrete structure in which prestressing such as tightening and tension is not introduced, and a configuration in which the bracket can be accommodated in the beam formation regardless of the installation location of the PCa column. It is to provide a method for joining column beams.

As a means for solving the problems of the prior art, a method for joining precast concrete column beams according to the invention of claim 1 is as follows:
In the method of joining the precast concrete beam 4 to the precast concrete column 1,
A first through hole 2 for inserting the beam upper main bar and a second through hole 3 for inserting the beam lower main bar are provided in the horizontal direction at the beam joint position of the precast concrete column 1 respectively.
The precast concrete beam 4 exposes the upper part of the rib 4a that does not have the top main bar, and provides the haunch-like step 5 on the bottom surface of the joint end with the precast concrete column 1, and the haunch-like step 5 The main bar through hole 6 is provided in the beam axis direction to pass through the beam lower bar main bar 8.
A shearing force transmitting means 7 is provided at a joint end surface portion of the precast concrete beam 4 with the precast concrete column 1;
The precast concrete beam 4 has a main beam through hole 6 of the hunch-like step portion 5 aligned with the second through hole 3 of the precast concrete column 1 to the main bar through hole 6 and the second through hole 3 and a beam lower main bar 8. Through which the grout material is injected and hardened into the main muscle through-hole 6 and the second through-hole 3 ;
And the beam upper main reinforcement 9 through the first through-hole 2 of Precast Concrete Columns 1 in terms of the Haisuji to the stirrups 4a in phase by solidifying by injecting grout even in the same first through hole 2 in Connect the precast concrete pillar 1 and the precast concrete beam 4 facing each other,
The shear force transmitting means 7 is filled with a grout material and hardened to complete the shear force transmitting means 7.
After that, the precast concrete column 1 and the precast concrete beam 4 are integrated by placing the postcast concrete 13 on the rib 4a on the upper surface of the precast concrete beam 4 and the main upper bar 9 of the beam. To do.

The method of joining precast concrete column beams according to the invention described in claim 2
In the method of joining the precast concrete beam 40 to the precast concrete column 10,
A first through hole 20 for inserting the beam upper main bar is provided at the beam joint position of the precast concrete column 10 and a beam receiving bracket 10a is provided at a position below the first through hole 20, and the bracket 10a and the precast concrete structure are provided. A second through-hole 30 for inserting a beam lower main reinforcement penetrating the pillar 10 in the horizontal direction is provided;
The precast concrete beam 40 exposes the upper part of the stirrup 40a that does not have the upper end main reinforcement, and the notch part that accommodates the bracket 10a in the beam formation of the precast concrete beam 40 at the joint end surface with the precast concrete column 10 40c is formed, and a hunch-like step portion 50 is provided on the bottom surface of the beam, and a main bar through-hole 60 that penetrates the beam bottom main bar 80 in the beam axis direction of the hunch-like step portion 50 is provided.
In the precast concrete beam 40, the notch 40 c is fitted onto the bracket 10 a of the precast concrete column 10, and the main bar through hole 60 of the hunch-shaped step 50 matches the second through hole 30 of the precast concrete column 10. Passing the beam lower main bar 80 through the main bar through-hole 60 and the second through-hole 30, and injecting and hardening a grout material into the main bar through-hole 60 and the second through-hole 30 ;
The beam upper main bar 90 is arranged in the rib 40a, the beam upper main bar 90 is passed through the first through hole 20 of the precast concrete column 10, and the grout material is also injected into the first through hole 20. The precast concrete column 10 and the precast concrete beam 40, which are opposed to each other by being hardened,
Thereafter, the precast concrete column 10 and the precast concrete beam 40 are integrated by placing the postcast concrete 13 on the ribs 40a on the upper surface of the precast concrete beam 40 and the main upper bar 90 of the beam. To do.

The invention described in claim 3 is the method for joining precast concrete column beams described in claim 1 or 2,
The through holes 2, 3 or 20, 30 of the precast concrete column 1 or 10 and the main reinforcement through holes 6 or 60 of the hunched stepped portions 5 or 50 are formed by sheath tubes.

The invention described in claim 4 is the method of joining precast concrete column beams described in claim 1 or 2,
The beam lower main bar 6 or 60 is fixed by providing a fixing tool 11 or 12 at the end thereof.

The invention described in claim 5 is the method for joining precast concrete column beams described in claim 1 ,
The shearing force transmitting means 7 or 7 'is a cotter formed by injecting and hardening a grout material.

The invention described in claim 6 is the method of joining precast concrete column beams according to claim 1 or 2,
Precast Concrete Columns 1 or 10, characterized in that that will be formed to the height of the plurality of layers.

  The method for joining precast concrete column beams according to the inventions described in claims 1 and 3 to 5 includes the main bar through-hole 6 of the hunch-like step portion 5 provided on the lower bottom surface portion of the PCa beam 4 and the second through-hole of the column. Passing the beam lower main bar 8 through 3 and the beam upper main bar 9 through the first through hole 2 of the PCa column 1 and filling each with grout material and solidifying them. Since no prestressing work is required, the labor-saving and the construction can be simplified, the work efficiency can be improved, and the construction period can be shortened. Further, materials such as fasteners and tools for introducing prestress are not required.

  In the method for joining precast concrete column beams according to the invention described in claims 2, 3, and 4, the notch portion 40 c formed on the joining end surface portion of the PCa beam 40 is fitted (mounted) on the bracket 10 a of the PCa column 10. ), The beam lower main bar 80 is passed through the main bar through hole 60 of the haunch-shaped step 50 of the PCa beam 40 and the second through hole 30 of the PCa column 10, and the beam upper main bar 90 is passed through the first through hole 20 of the PCa column 10. It is only necessary to fill and grout each with grout material, and no prestress introduction work is required, so even when joining orthogonal beams installed in the center of the building, it can be easily implemented, PCa This can be carried out regardless of the installation location of the pillar 10.

  According to the invention described in claim 6, since the PCa pillars 1 and 10 are formed at a height of a plurality of layers, the troublesome work of constructing the pillars for each layer can be omitted, and the work efficiency is dramatically improved. To improve. Therefore, it is particularly suitable for construction of a supermarket or factory having a large floor area and a relatively low building height, and the PCa beams 4 and 40 can be joined in order to improve work efficiency and shorten the construction period.

The present invention has a structure in which a PCa beam 4 is joined to a PCa column 1. The PCa column 1 is provided with a first through hole 2 for inserting the beam upper main bar and a second through hole 3 for inserting the beam lower main bar in the horizontal direction at the beam joining position. The PCa beam 4 has a configuration in which the upper part of the rib 4a having no upper main bar is exposed, and a haunch-like step portion 5 is provided on the bottom end portion of the joint end portion with the PCa pillar 1, and the haunch-like step portion 5 The main bar through hole 6 is provided in the axial direction so as to penetrate the beam lower bar main bar 8. The PCa beam 4 is provided with shear force transmitting means 7 at the joint end surface portion with the PCa column 1, and the main bar through-hole 6 of the hunch-like step portion 5 is aligned with the second through-hole 3 of the PCa column 1. The lower main bar 8 is passed, and the beam upper main bar 9 is arranged in the rib 4a and passed through the first through hole 2 of the PCa column 1. The grout material is filled into the first through hole 2 of the PCa column 1 and the main through hole 6 and the second through hole 3 of the hunch-shaped step portion 5 to complete the shearing force transmission means. Post-cast concrete 13 is placed.

Hereinafter, an embodiment of a method for joining precast concrete column beams according to the present invention will be described with reference to the drawings.
First, as shown in FIG. 1, the PCa column 1 is erected on the foundation concrete G, and at the beam joint position, a first through hole 2 for inserting a beam upper main bar and a second through hole for inserting a beam lower main bar. 3 is provided in the horizontal direction. Further, the PCa beam 4 is configured such that the upper portion of the rib 4a not having the upper principal line is exposed. In other words, it is formed as a half-finished state at a factory or site. At the joint end with the PCa column 1, a hunch-like step portion 5 is provided on the lower bottom surface portion, and a main reinforcement through-hole 6 through which a beam lower end main reinforcement 8 (see FIG. 3) described later is passed in the axial direction of the hunch-like step portion 5. Is provided.

  The main bar through-hole 6 is formed by a sheath tube as shown in FIG. 2, and is arranged at the bottom of the barb 4a when the PCa beam 4 is molded at a factory or the like. In this example, four sheath tubes were used. Although illustration is omitted, the first through hole 2 and the second through hole 3 of the PCa pillar 1 are also integrally formed by arranging four sheath tubes having the same diameter (the invention according to claim 3).

  As shown in FIG. 3, the PCa beam 4 is provided with shearing force transmission means 7 at the end of the joint surface with the PCa column 1. The shearing force transmission means 7 is called, for example, a cotter, and is arranged at the joint end surface portion of the PCa beam 4 at a substantially central portion of the streaks 4a (see FIG. 2). The cotter has a dent of about 15 to 20 mm and is filled with a grout material, which will be described later, so that a shearing force is transmitted to the PCa column 1. In order to further enhance the shear transmission capability, it is preferable to provide a cotter of substantially the same shape and size at the same height position on the opposing PCa column 1 as well.

  The PCa beam 4 configured as described above is configured so that the main bar through-hole 6 of the hunch-shaped step portion 5 and the second through-hole 3 of the PCa pillar 1 facing the same coincide with each other. The beam lower main reinforcing bar 8 is inserted from the end, passed through the second through hole 3 of the PCa column 1, and passed through the main reinforcing bar through hole 6 of the PCa beam 4 arranged in the same configuration on the other side.

  Next, the beam upper main bar 9 is arranged in the rib 4a exposed on the upper surface of the PCa beam 4, inserted into the first through hole 2 of the PCa column 1, and the other PCa arranged in the same configuration. The bar 4 is inserted into the rib 4a. Thereafter, as shown by an arrow A, the grout material is filled from one side or both sides of the first through hole 2 of the PCa pillar 1. Further, as shown by an arrow B, the grout material can be filled from one side or both sides of the main reinforcement through-hole 6 of the PCa beam 4 to reach the second through-hole 3. At that time, the grout material is also injected into the shearing force transmitting means 7 to complete the shearing force transmitting means 7.

After that, floor reinforcement is applied to the beam upper main reinforcement 9 arranged on the upper surface of the PCa beam 4, and then the post-cast concrete 13 (also called floor concrete) is placed to integrally connect the PCa column beam. To do.
In the method for joining precast concrete column beams of the present invention, as shown in FIG. 1 or FIG. 3, the PCa columns 1 are formed in a plurality of layers or building heights, and the PCa beams 4 and 4 are connected to the PCa columns 1. Join the beam joints in order. Therefore, the troublesome work of connecting the pillars vertically to the building height for each layer is reduced, and the work efficiency can be dramatically improved.

  The stress transmission between the columns and beams joined as described above transmits the stress applied from the PCa column 1 to the beam lower main bar 8 at the time of deformation to the lower main bar 4b in the PCa beam 4 arranged immediately above the beam lower main bar 8. Done by things.

  Incidentally, since the stress transmission capability is proportional to the axial length of the hunch-like step portion 5, when a high stress transmission force is required, the hunch-like step portion 5 may be elongated in the axial direction. However, in terms of construction, it is preferable to shorten the haunch-like stepped portion 5 as much as possible to reduce the contact between members. For this reason, as shown in FIG. 4, it is preferable that the fixing tool 11 is attached to both ends of the beam lower end main reinforcement 8 for fixing (the invention according to claim 4). The fixing tool 11 is, for example, a screw material. This is a level of retaining and does not add prestress. Since the fixing tool 11 is applied with a force toward the inside of the PCa beam 4, stress is easily transmitted to the lower principal bar 4b of the beam 4 arranged on the upper surface thereof.

Next, a method for joining precast concrete column beams described in claim 2 will be described as a third embodiment. This embodiment is also based on the technical idea substantially the same as the first and second embodiments, and will be described below with reference to the drawings.
As shown in FIG. 5, a first through hole 20 for inserting a beam upper end main reinforcement is provided at a beam joint portion of the PCa column 10, and a beam receiving bracket 10 a (jaw) is positioned below the first through hole 20. Is integrated with the pillar. Further, the column 10 is provided with a second through hole 30 for inserting a beam lower end main reinforcing bar that penetrates the bracket 10a and the PCa column 1 in the horizontal direction.

  As in the first embodiment, the PCa beam 40 is configured such that the upper part of the stirrup 40a that does not have the upper principal bar is exposed. A notch 40c for accommodating the bracket 10a in the beam formation is formed on the end surface of the joint with the PCa column 10. Further, a haunch-shaped step portion 50 is provided on the lower bottom surface portion thereof, and a main bar through-hole 60 through which a beam lower end main bar 80 (see FIG. 6) described later is passed in the axial direction of the haunch-shaped step portion 50 is provided.

  As shown in FIG. 6, the PCa beam 40 configured as described above is configured such that the notch portion 40 c is fitted to the bracket 10 a of the PCa column 10 facing the notch portion 40, and the main bar of the hunch-like step portion 50 of the PCa beam 40. The through hole 60 is aligned with the second through hole 30 of the PCa pillar 10. Incidentally, the shearing force transmitting means 70 may be attached at a position where the upper surface portion of the bracket 10a of the column 10 and the upper surface portion of the notch 40c are in contact with each other as in the first embodiment (see FIGS. 5 and 6). .

  Then, the beam lower main bar 80 is inserted from one end of the main bar through hole 60 of the haunch-like stepped portion 50, traverses the second through hole 30 of the PCa column 10, and the other bar main bar of the PCa beam 40 arranged in the same configuration. Insert it through the through hole 60. Further, the beam upper main bar 90 is arranged in the rib 40a on the upper surface of the PCa beam 40, inserted into the first through hole 20 of the PCa column 10, and the other bar of the PCa beam 40 arranged in the same configuration. The bar is passed through the muscle 40a.

Thereafter, similar to FIG. 3, the grout material is filled into the first through hole 20 of the PCa column 10, the main through hole 60 of the PCa beam 40, and the second through hole 30 of the PCa column 10, respectively. Post-cast concrete 130 is placed to join the PCa column beams. The filling of the grout material and the placement of the post-cast concrete 130 are as described above.

 Although not shown in the figure, it is also preferable that the fixing tool 11 is attached and fixed to both ends of the beam lower main bar 80 to shorten the haunch-like stepped portion 50 in the axial direction as in FIG.

  Although the above-described embodiment has been described with respect to a column connecting orthogonal beams arranged in the center of a building, the present invention can also be implemented in a column arranged in an outer peripheral portion of a building. The following points will be described with reference to FIGS. 7A and 7B. Moreover, since it is substantially the same as the technical idea of Examples 1-4, it demonstrates centering on the difference.

A first through hole 2 ′ and a second through hole 3 ′ are provided in the horizontal direction on the PCa column 1 ′ standing on the outer peripheral portion of the building shown in FIG. 7A. Each of the first through hole 2 ′ and the second through hole 3 ′ has a wide end on the outer wall surface side. And as shown in FIG. 7B, after providing shearing force transmission means 7 'in the joint end surface part with PCa pillar 1', the main reinforcement through-hole of the haunch-like step part 5 'comprised similarly to Example 1 6 'and the 2nd through-hole 3' of PCa pillar 1 'are made to correspond, and beam lower end main reinforcement 8 ' is inserted from the end of main reinforcement penetration hole 6 'of said hunch-like step part 5', and 2nd of PCa pillar 1 'is inserted. Pass through the through-hole 3 '. Thereafter, in the wide space formed on the outer wall surface side of the second through-hole 3 ′, the end of the inserted beam lower end principal bar 8 ′ is fixed by the fixing tool 11 ′. The fixing tool 11 ′ is the screw material described above. The beam upper main bar 9 'is also arranged in the rib 4a' as described above, inserted into the first through hole 2 ', and its end is fixed by the fixing tool 11'. After that, grout material is filled from the outer wall surface side (arrow C) of the first through hole 2 ′ and the second through hole 3 ′, and post-cast concrete 13 ′ is placed on the beam upper main bar 9 ′ on the upper surface of the beam. Join the beams.

  In addition, it is also preferable that the fixing tool 12 is attached to the building-side end of the beam lower main bar 8 'to shorten the axial length of the haunch-shaped step 5'. Furthermore, the joining method which provides the bracket described in FIGS. 5 and 6 and Examples 3 and 4 can be similarly performed.

  Next, in order to know the practicality of the joining method of the precast concrete column beam described in Example 1, Example 2, and Example 4, the column and the beam were separately created when the column and the beam were integrally hit. Then, a force test using a cross-shaped specimen was performed to compare the strength and rigidity when both were integrated (the same method as in Examples 1, 2, and 4). In other words, the column of the specimen is provided with a through hole for the main beam of the beam, the bottom bottom part of the main beam is provided with a hunch-like step part into which the lower main bar is inserted later, and the main bar through hole. An experiment was conducted using a cross-shaped specimen in which main bars were placed in the holes of the rods and filled with a grout material or the like. The result is shown in FIG.

As shown in FIG. 8A, the strength of the beam member of the one that is integrally hit (PH1) and the one that is integrated later after pre-casting the column beams of Examples 1, 2, and 4 (PH2 to PH4) are substantially equal. . Further, as shown in FIG. 8B, the rigidity of the beam members of the one that is integrally hit (PH1) and the one that is integrated later after pre-casting the column beam (PH2 to PH4) are substantially the same.
In other words, it can be seen that the method for joining precast concrete column beams of the present invention exhibits substantially the same structural performance as that of a united structure. Therefore, even if the column beam joining method by the simple method described in the first, second, and fourth embodiments is performed, it can be carried out positively without affecting the structural performance such as strength and rigidity. This result naturally shows the practicality of other embodiments.

  The embodiments have been described with reference to the drawings. However, the present invention is not limited to the illustrated embodiments, and design modifications and application variations that are usually made by those skilled in the art are within the scope of the technical idea of the invention. Add a note to include the scope

It is the elevation which showed the state before joining of the pillar and beam concerning the present invention. It is a side view which shows the specific example of a main reinforcement through-hole and a shearing force transmission means. It is the elevation which showed the outline of the joining method of the precast concrete column beam which concerns on this invention. It is an elevational view showing an example in which a fixing tool is attached to both ends of the beam bottom main bar. It is the elevation which showed the state before joining of the pillar and beam in Example 3 of this invention. It is an elevation which shows the outline of the joining method of the precast concrete column beam of Example 3 of this invention. A and B are elevation views showing the concept of carrying out the present invention on the pillars of the outer peripheral part of the building. A and B are graphs showing the results of a force test using a cross-shaped specimen. It is the elevation which showed the outline of the joining method of the pillar and beam in the conventional precast concrete structure.

Explanation of symbols

1, 1 ', 10 pillars 2, 2', 20 first through hole 3, 3 ', 30 second through hole 4, 4', 40 beam 4a, 4a ', 40a stirrup 5, 5', 50 haunch shape Step 6, 6 ', 60 Main bar through hole 7, 7', 70 Shear force transmission means 8, 8 ', 80 Beam lower bar 9, 9', 90 Beam upper bar

Claims (6)

In a method of joining a precast concrete beam to a precast concrete column,
A first through hole for inserting the beam upper main bar and a second through hole for inserting the beam lower main bar are provided in the horizontal direction at the beam joint position of the precast concrete column, respectively.
The precast concrete beam exposes the upper part of the stirrup that does not have the top main bar, and provides a haunch-like step on the bottom surface of the joint end with the precast concrete column, in the beam axis direction of the haunch-like step The main bar through hole that penetrates the beam lower bar main bar is provided,
A shearing force transmitting means is provided at a joint end surface portion with the precast concrete column in the precast concrete beam,
In the precast concrete beam, the main bar through hole of the haunch-shaped step portion is made to coincide with the second through hole of the precast concrete column, and the lower main bar of the beam is passed through the main bar through hole and the second through hole. to solidify by injecting grout into the second through hole,
And beams the upper main reinforcement through the first through hole of the precast concrete Concrete Columns on that Haisuji into the rib in muscle, Precast Concrete which faced each other by solidifying by injecting grout even in the same first through hole in Connect the columns and precast concrete beams,
The shear force transmitting means is filled with grout material and hardened to complete the shear force transmitting means.
After that, the precast concrete column is characterized in that the precast concrete column and the precast concrete beam are integrated by placing post-cast concrete on the stirrup on the upper surface of the precast concrete beam and the main upper end of the beam. Beam joining method. In a method of joining a precast concrete beam to a precast concrete column,
A first through hole for inserting the beam upper main bar is provided at the beam joint position of the precast concrete column, a bracket for receiving the beam is provided below the first through hole, and the bracket and the precast concrete column are placed horizontally. Provide a second through-hole for inserting the bottom main beam of the beam to penetrate,
The precast concrete beam exposes the upper part of the stirrup that does not have the top main bar, and forms a notch that fits the bracket in the beam structure of the precast concrete beam at the joint end surface with the precast concrete column, A configuration in which a hunch-like step portion is provided on the bottom surface of the beam, and a main bar through-hole that penetrates the beam bottom main reinforcement in the beam axis direction of the hunch-like step portion is provided,
In the precast concrete beam, the notch is fitted to the bracket of the precast concrete column, the main reinforcement through hole of the hunch-shaped step portion is aligned with the second through hole of the precast concrete column, Passing the beam bottom main bar through the through hole, injecting and hardening grout material into the main bar through hole and the second through hole ,
And by Haisuji the beam upper main reinforcement to the rib in muscle, the same beam upper main reinforcement through the first through hole of the precast concrete Concrete Columns, opposed phase by solidifying by injecting grout even in the same first through hole Connecting the precast concrete pillars to the precast concrete beams,
After that, the precast concrete column is characterized in that the precast concrete column and the precast concrete beam are integrated by placing post-cast concrete on the stirrup on the upper surface of the precast concrete beam and the main upper end of the beam. Beam joining method.   The method for joining precast concrete column beams according to claim 1 or 2, wherein the through hole of the precast concrete column and the main reinforcement through hole of the hunch-shaped step portion are formed by a sheath tube.   The method of joining precast concrete column beams according to claim 1 or 2, wherein the beam lower main bar is fixed by providing a fixing tool at an end thereof. 2. The method of joining precast concrete column beams according to claim 1, wherein the shearing force transmitting means is a cotter formed by injecting and hardening a grout material.   The method for joining precast concrete column beams according to claim 1 or 2, wherein the precast concrete column is formed in a plurality of layers.

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