Column and beam frame construction method

Abstract

To easily fill grout into a joint space between a column member and a beam member when joining a beam member to a column member of a precast concrete structure from the side. [Solution] The method for constructing a column-beam frame includes a column member installation process for installing a column member 2, a beam member installation process for moving the beam member 5 laterally and arranging the end face 5f of the beam member 5 opposite the tip face 25f of the protrusion 25 formed by protruding from the side face of the column member 2 so as to form a joint space ZS between the end face 5f and the tip face 25f of the beam member 5, and a grout filling process for providing a joint formwork 90 to block the below and sides of the joint space ZS and filling the joint space ZS with grout. In the beam member installation process, the position of the beam member 5 is determined so that when the end face 5f of the beam member 5 is opposed to the tip face 25f of the protrusion 25, the underside and side faces of the protrusion 25 and the beam member 5 each extend in the same plane.

Description

[Technical Field]

[0001] The present invention relates to a method for constructing a column-beam frame by joining precast concrete column members and beam members to construct a column-beam frame. [Background technology]

[0002] In order to reduce the construction time when constructing a building structure, it is common to fabricate the components that make up the column-beam frame as precast concrete structures in a factory, and then transport and assemble them at the construction site. In this regard, for example, Patent Document 1 discloses a column-beam joint structure for a building in which a PCa (precast concrete) horizontal structure, in which a column joint and a beam are previously integrated, is attached horizontally to the PCa column of the building. In this column-beam joint structure for a building, the column joint that constitutes the PCa horizontal structure is directly joined to at least the PCa column of the lower floor at the column-beam joint, and the beams are directly joined to each other at at least one beam joint located between adjacent PCa columns.

[0003] Patent Document 2 discloses a PC beam-column joint structure comprising a precast concrete (PC) beam with the ends of the beam main reinforcement projecting horizontally from the end face, a PC column with column main reinforcement embedded and with joints for connecting the column main reinforcement embedded at least at the upper ends of the column main reinforcement, and a rectangular PC joint panel member with vertical through-holes for inserting the column main reinforcement and with joints for connecting the beam main reinforcement embedded, wherein the main beam reinforcement of the PC beam is fixed to the joints for connecting the beam main reinforcement embedded in the PC joint panel member, and the main column reinforcement of the PC column of an upper floor or relay reinforcement to be connected to the column main reinforcement is inserted from above into the through-holes of the joint panel member, passes through the PC joint panel member, and is fixed to the joints embedded in the upper ends of the column main reinforcement of the PC column of a lower floor.

[0004] Furthermore, Patent Document 3 discloses a PC beam-column joint structure comprising a first PC member having a rectangular parallelepiped PC (precast concrete) joint panel with horizontal through holes formed therein for inserting the main beam reinforcement, the PC joint panel being positioned so that it is located on the PC column of the lower floor, and second and third PC members having PC beam portions and being positioned on both sides of the PC joint panel, the main beam reinforcement protruding from the end of the PC beam portion of the second PC member, and a joint for connecting the main beam reinforcement being embedded in the end of the PC beam portion of the third PC member, the main beam reinforcement protruding from the second PC member being inserted from one end of the through hole, with its tip protruding from the other end of the through hole and fixed to the joint of the third PC member.

[0005] When joining two precast concrete members, the two members must be placed facing each other and grout must be filled into the joint space formed between their surfaces. However, when joining a precast concrete column member and a beam member, it is not easy to install a joint formwork to prevent grout leakage. The joint formwork is installed along the side and underside of the beam member, extending horizontally toward the column member. When the joint formwork is installed, its column-side edge abuts against the surface of the column member, and the joint formwork is positioned perpendicular to the surface of the column member, resulting in a linear contact between the joint formwork and the surface of the column member. If grout is to be filled in this state, the joint formwork will not be able to withstand the grout filling pressure, and the entire edge of the joint formwork facing the column member will warp outward relative to the joint space, separating the joint formwork from the surface of the column member and potentially causing the grout to leak out. To prevent this, it is possible to attach a support member, such as an L-shaped steel beam, to the surface of the column member to support the joint formwork from the outside, thereby resisting the grout filling pressure and preventing the grout from leaking out. However, attaching such a support member is time-consuming, which may make the grout filling process less easy overall. When joining a beam member to a precast concrete column member from the side, there is a need for a method for constructing a column-beam frame that allows grout to be easily filled into the joint space between the column member and the beam member. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-346587 [Patent Document 2] Japanese Patent Application Laid-Open No. 2004-278257 [Patent Document 3] Japanese Patent Application Laid-Open No. 2006-22494 Summary of the Invention [Problem to be solved by the invention]

[0007] The problem that the present invention aims to solve is to provide a method for constructing a column-beam frame that makes it possible to easily fill grout into the joint space between a column member and a beam member when joining the beam member to a precast concrete column member from the side. [Means for solving the problem]

[0008] The inventors have come up with the present invention by noting that a method for constructing a column-beam frame can be achieved efficiently by continuously filling grout into the interior of beam reinforcement joints embedded in the beam members and into the joint formwork between the column members and the beam members, and that the vertical accuracy of the column-beam frame can be easily adjusted by joining the column members and the other ends of the beam members via a cast-in-place concrete beam section. In order to solve the above problems, the present invention employs the following means. In other words, the method for constructing a column-beam frame of the present invention is a method for constructing a column-beam frame by joining precast concrete column members and beam members, wherein the column members have protrusions formed protruding from the side surfaces of the column members, and the method includes a column member installation step of installing the column members, a beam member installation step of moving the beam members laterally so that a joint space is formed between the tip surface of the protrusion and the end surface of the beam member, and a grout filling step of providing a joint formwork to close the below and the sides of the joint space and filling the joint space with grout, wherein the beam member installation step is characterized in that when the end surface of the beam member is opposed to the tip surface of the protrusion, the position of the beam member is determined so that the bottom surface and side surface of the protrusion and the beam member each extend in the same plane. According to the above-described configuration, in the beam member installation step, the beam member is moved laterally to face the end face of the beam member, forming a joint space between the tip face of the protrusion formed from the side face of the column member and the end face of the beam member. In this case, the beam member is positioned so that when the end face of the beam member faces the tip face of the protrusion, the bottom face and side face of the protrusion and the beam member extend in the same plane. Therefore, when a joint formwork is provided to close the bottom and sides of the joint space and fill the joint space with grout, the joint formwork can be provided, for example, so as to straddle the joint space and follow both the bottom face of the protrusion and the bottom face of the beam member, and so as to straddle the joint space and follow both the side face of the protrusion and the side face of the beam member, thereby enabling the joint formwork to be in face-to-face contact with each surface. This allows the joint form to be secured by tightening it from the outside by, for example, providing a clamping band or frame material around the contact area, making it easy to install. Furthermore, because the joint form is in contact with each surface as described above, it is also possible to effectively prevent the grout from leaking out. This makes it easy to fill with grout. In this way, it is possible to realize a method for constructing a column-beam frame that allows grout to be easily filled into the joint space between the column and beam members when joining the beam member to the precast concrete column member from the side.

[0009] In one aspect of the present invention, the beam member is formed as a full precast concrete structure in which both the lower main beam reinforcement on the lower side and the upper main beam reinforcement on the upper side are embedded in the concrete at one beam end joined to the column member, and is formed as a half precast concrete structure in which the lower main beam reinforcement is embedded in the concrete and the upper main beam reinforcement is exposed above the concrete at the center of the beam and the other beam end. With this configuration, one beam end to be joined to the column member is formed as a fully precast concrete structure with both the lower and upper beam main reinforcements embedded in concrete. Therefore, when joining the beam member to the column member by joining the connecting beam main reinforcements embedded in the column member to the beam main reinforcements of the beam member, both the lower and upper beam main reinforcements can be used to join the connecting beam main reinforcements. This allows for a strong connection between the beam member and the column member. Furthermore, because the other end of the beam is made of half-precast concrete, when concrete is poured above it, the floor slab for the upper floor can be formed simultaneously and integrally, making construction easier and enabling a strong connection between the beam and floor slab.

[0010] In one aspect of the present invention, the method further includes: an other column member installation step, in which the column member installed in the column member installation step is regarded as one of the column members, and another column member is installed at a position spaced apart from the one column member; and an in-situ poured concrete beam portion formation step, in which concrete is poured between the other beam end of the beam member opposite to the one beam end joined to the one column member and the other column member to form a poured-in-place concrete beam portion, and the other column member and the beam member are joined; and the column member installation step, the beam member installation step, the other column member installation step, the grout filling step, and the poured-in-place concrete beam portion formation step are repeatedly performed to construct the column-beam structure from below upward. According to this configuration, another column member is installed at a position separated from the first column member installed in the column member installation step, and concrete is poured between the other beam end opposite to the one beam end joined to the first column member and the other column member to form a cast-in-place concrete beam section. This makes it easy to construct a column-beam frame in which the first column member and the other column member are connected by a beam member. [Effects of the Invention]

[0011] According to the present invention, a method for constructing a column-beam frame can be provided that makes it possible to easily fill grout into the joint space between a column member and a beam member when joining the beam member to a precast concrete column member from the side. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a vertical cross-sectional view showing the configuration of a column-beam frame constructed by applying a method for constructing a column-beam frame according to an embodiment of the present invention. [Figure 2] FIG. 2 is an enlarged vertical cross-sectional view of the portion viewed from the arrow A in FIG. [Figure 3] FIG. 3 is a longitudinal sectional view of the portion viewed from the arrow II in FIG. 2. [Figure 4] FIG. 2 is an enlarged vertical cross-sectional view of the portion viewed from the arrow B in FIG. [Figure 5] 2 is a vertical cross-sectional view showing a state in which one column member has been installed when constructing the column-beam frame of FIG. 1. FIG. [Figure 6] FIG. 6 is a vertical cross-sectional view showing a state in which the beam member is moved laterally from the state shown in FIG. 5. [Figure 7] FIG. 10 is a partial vertical cross-sectional view showing a state in which the beam member is moved laterally so that the end face of the beam member faces the tip face of the protrusion. [Figure 8] This is a plan view of the joint between the column member and the beam member, viewed from above. [Figure 9] FIG. 2 is a schematic diagram showing the flow of grout in the grout filling process. [Figure 10] FIG. 10 is a vertical cross-sectional view showing another pole member installation process. [Figure 11] FIG. 10 is a vertical cross-sectional view showing another column member installation step in a method for constructing a beam-column frame according to a modified embodiment of the present invention. [Figure 12] FIG. 10 is a vertical cross-sectional view showing a beam member installation step in a method for constructing a beam-column frame according to a modified embodiment of the present invention. [Figure 13] FIG. 13 is a vertical cross-sectional view showing a state following FIG. 12 in a method for constructing a beam-column frame according to a modified embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0013] The present invention is a method for constructing a column-beam frame by joining precast concrete column members and beam members. A protrusion for positioning the height of the beam member is provided on the upper side of the column member. The protrusion has a cross section that matches that of the beam member. The column member and the beam member are joined by inserting a beam reinforcing bar joint embedded in the beam member onto the tip of the connecting beam main reinforcing bar protruding from the protrusion, and then filling the inside of the beam reinforcing bar joint and the gap between the column member and the beam member with grout. Hereinafter, an embodiment for carrying out a method for constructing a beam-column frame according to the present invention will be described with reference to the accompanying drawings. First, the configuration of a beam-column frame constructed by applying the method for constructing a beam-column frame according to an embodiment of the present invention will be described, and then the method for constructing a beam-column frame will be described. A longitudinal cross-sectional view showing the structure of the above-mentioned beam-column frame is shown in Fig. 1. As shown in Figure 1, the column-beam frame 1 includes multiple columns 11 extending in the vertical direction and beams 12 installed between adjacent columns 11 in the horizontal direction. Each column 11 is constructed by connecting multiple column members 2 in the vertical direction. Each column member 2 is made of precast concrete and has a predetermined length in the vertical direction. Each column member 2 mainly comprises a concrete portion 21, column main reinforcement 22 embedded in the concrete portion 21, and column reinforcement joint portions 23. The concrete portion 21 has, for example, a rectangular cross-sectional shape in plan view. A plurality of column main reinforcements 22 are embedded in the concrete portion 21. Here, there are no limitations on the number or arrangement of the column main reinforcements 22. The column main reinforcements 22 are provided extending in the vertical direction. The upper ends of the column main reinforcements 22 protrude upward from the upper surface of the concrete portion 21. The lower ends of the column main reinforcements 22 are inserted into the upper parts of column reinforcement joint parts 23 embedded in the lower end of the column member 2.

[0014] The column reinforcement joint 23 is formed in a cylindrical shape and has a structure with an internal space. The column reinforcement joint 23 is oriented so that the axial direction of the cylinder coincides with the vertical direction. The column reinforcement joint 23 is embedded in the concrete part 21. The lower end of the column reinforcement joint 23 is exposed on the underside of the concrete part 21, and the internal space of the column reinforcement joint 23 opens downward. A plurality of such column members 2 are connected in the vertical direction to form a column 11. The column members 2 positioned above and below each other are joined by inserting the upper end of the column main reinforcement 22 of the lower column member 2 from below into the internal space of the column reinforcement joint part 23 of the upper column member 2, and filling the internal space of the column reinforcement joint part 23 with grout (not shown). In addition, grout is filled between the concrete part 21 of the lower column member 2 and the concrete part 21 of the upper column member 2, forming a joint.

[0015] FIG. 2 is an enlarged vertical cross-sectional view of the portion indicated by the arrow A in FIG. As shown in Figures 1 and 2, each column member 2 has a protrusion 25 in the vertical direction at a portion facing an end face 5f of a beam member 5 constituting a beam 12, which will be described later. The protrusion 25 protrudes horizontally from the side surface 21s of the concrete portion 21 of the column member 2 toward the beam member 5. The protrusion 25 is formed integrally with the concrete portion 21. The shape of the protrusion 25 when viewed from the protruding direction of the protrusion 25 is formed to match the shape of the beam member 5 when viewed from the extension direction of the beam member 5. More specifically, when viewed from the extension direction of the beam member 5, the shapes of the protrusion 25 and the bottom surface of the beam member 5 match. Furthermore, when viewed from the extension direction of the beam member 5, the shapes of the protrusion 25 and the side surface of the beam member 5 match. Furthermore, in this embodiment, the shapes of the protrusion 25 and the top surface of the beam member 5 when viewed from the extension direction of the beam member 5 match. In this way, the protrusion 25 has the same shape as the end face 5f of the beam member 5. A recess 25d is formed in the center of the tip surface 25f of the protruding portion 25 so as to recess inward of the protruding portion 25, i.e., in a direction away from the end surface 5f of the beam member 5. This recess 25d is filled with grout G that forms a joint Z, which will be described later, to form a cotter that bears the shear force acting between the protruding portion 25 and the grout G that forms the joint Z.

[0016] Furthermore, the column member 2 is provided with a plurality of connecting beam main reinforcements 27A, 27B that protrude from the side, more specifically from the tip end surface 25f of the protruding portion 25, toward the beam member 5. The multiple connecting beam main reinforcements 27A, 27B are provided to penetrate horizontally through the concrete portion 21 and the protruding portion 25. The connecting beam main reinforcement 27A is provided at the same height as the upper beam main reinforcement 52A of the beam member 5 described below. The connecting beam main reinforcement 27B is provided below the connecting beam main reinforcement 27A. The connecting beam main reinforcement 27B is provided at the same height as the lower beam main reinforcement 52B of the beam member 5 described below. A plurality of stiffeners 28 are embedded near the protruding portion 25, and are arranged to surround the connecting beam main reinforcements 27A, 27B.

[0017] In this embodiment, each beam 12 includes a beam member 5 and a cast-in-place concrete beam portion 7 . As shown in Fig. 1, the beam member 5 is made of precast concrete, and one beam end 5s (one end of the beam member 5) is directly joined to one column member 2A that forms the column 11 shown on the left side in Fig. 1, while the other beam end 5t (the other end of the beam member 5) is joined to another column member 2B that forms the column 11 shown on the right side in Fig. 1 via a cast-in-place concrete beam portion 7. As shown in Figs. 1 and 2, the beam member 5 mainly comprises concrete 51, beam main reinforcement 52, beam ribs 53, and beam reinforcement joints 54.

[0018] Concrete 51 has, for example, a rectangular cross-sectional shape when viewed from the extension direction of beam member 5. Concrete 51 integrally includes first concrete portion 51A and second concrete portion 51B. The first concrete portion 51A forms the concrete 51 on one beam end 5s side. The first concrete portion 51A is provided at one beam end 5s of the beam member 5 so as to form the entire cross section of the beam member 5. As shown in FIG. 2 , the first concrete portion 51A has a through-hole 51k formed in the vertical center thereof. The through-hole 51k penetrates the first concrete portion 51A in the beam width direction (the depth direction of the paper in FIG. 2 ) and allows for the insertion of equipment piping or the like. The first concrete portion 51A has a recess 51d formed in the center of the end face 5f opposite the tip face 25f of the protrusion 25, the recess 51d being recessed inward of the first concrete portion 51A, i.e., in a direction away from the tip face 25f of the protrusion 25. The recess 51d is filled with grout G that forms a joint Z (described later), forming a cotter to bear the shear force acting between the protrusion 25 and the grout G that forms the joint Z. The second concrete portion 51B forms the concrete 51 in the beam center portion 5c and the other beam end portion 5t. The second concrete portion 51B is provided only in the lower portion of the beam member 5, in the beam center portion 5c in the extension direction of the beam member 5 and the other beam end portion 5t.

[0019] 3 is a vertical cross-sectional view of the portion indicated by the arrow II in FIG. 2. FIG. As shown in FIGS. 2 and 3, the beam main reinforcements 52 include a plurality of upper beam main reinforcements 52A and a plurality of lower beam main reinforcements 52B. The beam main reinforcements 52 are provided corresponding to each of the plurality of joining beam main reinforcements 27A and 27B. The upper beam main reinforcements 52A and the lower beam main reinforcements 52B extend in the extension direction (horizontal direction) of the beam member 5. The lower beam main reinforcements 52B are provided below the upper beam main reinforcements 52A. The upper beam main reinforcements 52A are provided above the lower beam main reinforcements 52B. In this embodiment, the upper beam main reinforcements 52A and the lower beam main reinforcements 52B are each arranged in two rows, one above the other. In each row, a plurality of upper beam main reinforcements 52A and a plurality of lower beam main reinforcements 52B are arranged side by side in the beam width direction. In this embodiment, the diameter and strength of the upper beam main reinforcement 52A and the lower beam main reinforcement 52B are set smaller than the diameter and strength of the joining beam main reinforcement 27A, 27B.

[0020] 1 and 2, the beam member 5 is formed as a full precast concrete structure in which both the lower beam main reinforcement 52B and the upper beam main reinforcement 52A are embedded in the first concrete section 51A at one beam end 5s. In addition, the beam member 5 is formed as a half precast concrete structure in which the lower beam main reinforcement 52B is embedded in the second concrete section 51B at the beam center 5c and the other beam end 5t, and the upper beam main reinforcement 52A is exposed above the concrete 51A. A plurality of sets of beam reinforcements 53 are provided at intervals in the extension direction of the beam member 5. Each beam reinforcement 53 is provided so as to surround an upper beam main reinforcement 52A and a lower beam main reinforcement 52B.

[0021] The beam reinforcement joints 54 are cylindrical and have an internal space. The beam reinforcement joints 54 are oriented so that the axial direction of the cylinder coincides with the horizontal direction in which the beam member 5 extends. A plurality of beam reinforcement joints 54 are embedded in the first concrete portion 51A at one beam end 5s of the beam member 5. A beam reinforcement joint 54 is provided corresponding to each of the plurality of beam main reinforcements 52, and at the same time, a beam reinforcement joint 54 is provided corresponding to each of the plurality of connecting beam main reinforcements 27A, 27B. As shown in Fig. 2, one end 52s of the beam main reinforcement 52 (upper beam main reinforcement 52A, lower beam main reinforcement 52B) embedded in the beam member 5 is inserted into the end of each of the multiple beam reinforcement joints 54 on the beam center 5c side (right side in Fig. 2). The inner peripheral surface of the beam reinforcement joint 54 and the outer peripheral surface of the beam main reinforcement 52 are spaced apart in the radial direction of the beam reinforcement joint 54, thereby forming a gap between them. The end of each of the multiple beam bar joints 54 on the beam end portion 5s side (left side in FIG. 2) is exposed at the end face 5f of the first concrete portion 51A (concrete 51) of the beam member 5, and the internal space of the beam bar joints 54 opens horizontally and communicates with the outside. In each beam bar joint 54, the end of the corresponding connecting beam main reinforcement 27A, 27B is inserted from the end on the beam end portion 5s side that opens horizontally and communicates with the outside. The inner peripheral surface of the beam bar joint 54 and the outer peripheral surfaces of the connecting beam main reinforcement 27A, 27B are spaced apart in the radial direction of the beam bar joint 54, forming a gap between them.

[0022] Each beam bar joint 54 has through holes 54h that penetrate in a direction perpendicular to the axial direction of the beam bar joint 54, so as to communicate the internal space of the beam bar joint 54 with the outside of the beam bar joint 54. For each beam bar joint 54, the through holes 54h are provided at both ends in the axial direction of the beam bar joint 54. Thus, in this embodiment, each beam bar joint 54 has two through holes 54h. In particular, in this embodiment, one of the two through holes 54h is opened in a portion where a gap is formed between the inner peripheral surface of the beam bar joint 54 and the outer peripheral surface of the beam main reinforcement 52 when one end 52s of the beam main reinforcement 52 is inserted in the axial direction of the beam bar joint 54. The other of the two through holes 54h is opened in a portion where a gap is formed between the inner peripheral surface of the beam bar joint 54 and the outer peripheral surfaces of the beam main reinforcement 52 when the ends of the connecting beam main reinforcement 27A, 27B are inserted in the axial direction of the beam bar joint 54.

[0023] In the internal space of each beam reinforcement joint section 54, grout G is filled in the gap between the end of the connecting beam main reinforcement 27A, 27B and one end 52s of the beam main reinforcement 52 (upper beam main reinforcement 52A, lower beam main reinforcement 52B), the gap between the inner surface of the beam reinforcement joint section 54 and the outer surface of the beam main reinforcement 52, and the gap between the inner surface of the beam reinforcement joint section 54 and the outer surface of the connecting beam main reinforcement 27A, 27B. The beam member 5 is arranged so that a predetermined gap, which will be described later as a joint space ZS using Figure 9 etc., is formed between the end face 5f of one beam end portion 5s and the tip face 25f of the protrusion 25 of the column member 2 facing the end face 5f. The joint space ZS, which is the gap between the end face 5f and the tip face 25f, is filled with grout G to form a joint Z.

[0024] In order to fill the grout G as described above, the beam member 5 is formed with a plurality of communication passages 58 as shown in Fig. 3. In this embodiment, the plurality of communication passages 58 are provided corresponding to all of the through holes 54h of all of the beam reinforcement joints 54. Therefore, in this embodiment, two communication passages 58 are provided for each beam reinforcement joint 54. One end of each of the plurality of communication passages 58 is provided to communicate with a corresponding through hole 54h. Each of the communication passages 58 is connected to a corresponding through hole 54h. Each of the plurality of communication passages 58 is provided to extend from the through hole 54h through the interior of the first concrete portion 51A to surfaces 51s, 51t other than the end face 5f. The other end of each of the plurality of communication passages 58 is provided to open from the surfaces 51s, 51t other than the end face 5f toward the outside. In this way, each of the plurality of communication passages 58 communicates the internal space of the beam reinforcement joint portion 54 with the outside of the beam member 5 via the corresponding through hole 54h of the beam reinforcement joint portion 54.

[0025] More specifically, in this embodiment, the internal space of beam reinforcement joint 54 embedded below first concrete portion 51A communicates with the outside from lateral surface 51s (i.e., side surface) of first concrete portion 51A by communicating passage 58. The internal space of beam reinforcement joint 54 embedded above first concrete portion 51A communicates with the outside from either lateral surface 51s of first concrete portion 51A or upward-facing surface 51t (i.e., top surface) of first concrete portion 51A by communicating passage 58. Such a communication passage 58 can be formed by burying a pipe material such as a polyvinyl chloride pipe when forming the first concrete portion 51A of the beam member 5 by pouring concrete. As will be described in detail later, the grout G is filled into the internal spaces of the plurality of beam reinforcement joint portions 54 through one communication passage 58C (see FIG. 2) of the plurality of communication passages 58. After the internal spaces of the plurality of beam reinforcement joint portions 54 are filled with the grout G, each of the plurality of communication passages 58 is also filled with the grout G.

[0026] The cast-in-place concrete beam section 7 includes a first cast-in-place concrete section 71 formed between the other beam end section 5t of the beam member 5 and the other column member 2B, and a second cast-in-place concrete section 72 formed above the second concrete section 51B of the beam member 5. The first cast-in-place concrete section 71 and the second cast-in-place concrete section 72 are integrally formed. FIG. 4 is an enlarged vertical cross-sectional view of the portion viewed from the arrow B in FIG. A plurality of cylindrical beam reinforcement joints 59 are provided at the positions of the protruding portions 25 of the other column member 2B so as to correspond to each of the beam main reinforcements 52. The counterpart member ends 52t of the upper beam main reinforcements 52A and the lower beam main reinforcements 52B are inserted into the ends of the corresponding beam reinforcement joints 59 on the beam center portion 5c side. Ends of connecting beam main reinforcements 27A, 27B provided to protrude from the protruding portions 25 of the other column member 2B are inserted into each of the beam reinforcement joints 59. Concrete is poured on site to embed the upper beam main reinforcements 52A, the lower beam main reinforcements 52B, and the plurality of beam reinforcement joints 59, thereby forming a first cast-in-place concrete section 71. The second cast-in-place concrete section 72 is formed by pouring concrete on-site at the beam center 5c of the beam member 5 and the other beam end 5t so as to bury the upper beam main reinforcement 52A above the second concrete section 51B.

[0027] In the above-described configuration, the upper beam main reinforcement 52A and the lower beam main reinforcement 52B are connected to the connecting beam main reinforcement 27A and 27B of the column members 2A and 2B using beam reinforcement joints 54 and 59. As described above, the diameter and strength of the upper beam main reinforcement 52A and the lower beam main reinforcement 52B are set smaller than those of the connecting beam main reinforcement 27A and 27B. This configuration shifts the location where a plastic hinge occurs in the event of an earthquake or other event from position P1 at the end of the beam 12 to position P2 at the end of the beam reinforcement joints 54 and 59 toward the center of the beam 12, as shown in FIG. 1 . This allows hinge relocation, which keeps the column-beam joint within its elastic range.

[0028] Next, a method for constructing the above-described beam-column frame 1 will be described. To construct the column-beam frame 1, the following steps are carried out on each floor. (Column member installation process) FIG. 5 is a vertical cross-sectional view showing a state in which one column member has been installed when constructing the column-beam frame of FIG. First, on each floor, one column member 2A is installed in a predetermined position as shown in Figure 5. At this time, if a column member 2A of a lower floor is already installed below the one column member 2A to be installed, the upper end of the column main reinforcement 22 of the column member 2A of the lower floor is inserted from below into the lower part of the column reinforcement joint part 23 of the one column member 2A.

[0029] (Beam member installation process) Next, the beam member 5 is hung and placed at a position facing the protruding portion 25 of one of the pillar members 2A in the horizontal direction. Fig. 6 is a vertical cross-sectional view showing a state in which the beam member has been moved laterally from the state shown in Fig. 5. Fig. 7 is a partial vertical cross-sectional view showing a state in which the beam member has been moved laterally so that the end face of the beam member faces the tip face of the protrusion. Fig. 8 is a plan view of the joint between the column member and the beam member as viewed from above. Next, the beam member 5 is moved laterally, and the connecting beam main reinforcements 27A, 27B protruding from the protruding portion 25 are inserted into each of the multiple beam reinforcement joints 54. Then, the beam member 5 is positioned so that the tip surface 25f of the protruding portion 25 of one column member 2A faces the end surface 5f of the beam member 5, with a predetermined gap, i.e., joint space ZS, between them. When the end surface 5f of the beam member 5 faces the tip surface 25f of the protruding portion 25, the positions of the bottom surface, both side surfaces, and top surface of the protruding portion 25 and the beam member 5 are aligned when viewed from the extension direction of the beam member 5. More specifically, the beam member 5 is positioned so that the bottom surfaces of the protruding portion 25 and the beam member 5, and the side surfaces of the protruding portion 25 and the beam member 5, extend in the same plane.

[0030] Here, to form the joint space ZS, a joint width securing means 81 having a predetermined length is provided on either the surface of the column member 2 (tip surface 25f of the protrusion 25) or the end surface 5f of the beam member 5, protruding a predetermined length toward the other so as to maintain a constant width of the joint Z. In this embodiment, the joint width securing means 81 is formed by a bolt protruding a predetermined length toward the end surface 5f of the beam member 5 on the tip surface 25f of the protrusion 25 of the column member 2 and screwing it into an insert embedded in the protrusion 25. When the beam member 5 is moved laterally, the end surface 5f of the beam member 5 is abutted against the bolt serving as the joint width securing means 81, so that the tip surface 25f of the protrusion 25 of one column member 2A and the end surface 5f of the beam member 5 face each other with a predetermined gap therebetween.

[0031] In this state, the column member 2 and the beam member 5 are joined by separation suppression means 82. In this embodiment, the separation suppression means 82 includes, for example, fixing metal fittings 83 with an L-shaped cross section that are bolted to the upper and lower surfaces of the first concrete portion 51A of the beam member 5, and bolts 84 that connect the fixing metal fittings 83 to the side surface 21s of the column member 2. Such separation suppression means 82 suppresses the column member 2 and the beam member 5 from separating from each other due to the pressure that will be applied later when grout G is filled into the joint space ZS.

[0032] (Grout filling process) Next, grout G is filled into the joint space ZS between the tip end surface 25f of the protruding portion 25 of one of the column members 2A and the end surface 5f of the beam member 5, thereby forming a joint Z. To do this, first, a joint formwork 90 is installed so as to close the joint space ZS from below and on both sides (joint formwork installation process). The joint formwork 90 is installed so as to cover the joint space ZS between the tip surface 25f of the protrusion 25 of one column member 2A and the end surface 5f of the beam member 5 from below and on both sides. As described above, the beam member 5 is aligned so that the respective undersides of the protrusion 25 and the beam member 5, and the respective side surfaces of the protrusion 25 and the beam member 5, extend within the same plane. Therefore, by installing the joint formwork 90 so that it extends within these planes, the joint formwork 90 can be easily installed.

[0033] FIG. 9 is a schematic diagram showing the flow of grout in the grout filling step. Next, grout G is filled between the tip end face 25f of the protruding portion 25 of one of the pillar members 2A and the end face 5f of the beam member 5 (grout filling step). After the above-described steps up to the installation of the joint formwork 90 have been completed, the joint space ZS and the internal space of each beam reinforcement joint 54 are in communication with each other because a gap is formed between the inner peripheral surface of the beam reinforcement joint 54 and the outer peripheral surface of the end of the connecting beam main reinforcement 27A, 27B inserted into the beam reinforcement joint 54. The internal space of each beam reinforcement joint 54 is also in communication with the outside from the surfaces 51s, 51t of the beam member 5 via the through holes 54h and the communication passages 58 connected thereto. In this way, the joint space ZS, the internal space of each beam reinforcement joint 54, and the communication passages 58 formed for each beam reinforcement joint 54 are all in communication with each other, forming a single space. In this embodiment, conceptually, for such a single space, grout G is pressed into the openings of one communication passage 58C of the plurality of communication passages 58 provided on the surfaces 51s, 51t of the beam member 5, thereby filling all of the portions that communicate as the single space with grout G. By continuing to pressurize the grout G until the grout G is discharged from the openings of all communication passages 58 other than the one communication passage 58C provided on the surfaces 51s, 51t of the beam member 5, it can be confirmed that the grout G has been evenly filled into the joint space ZS and the internal spaces of all beam reinforcement joint portions 54.

[0034] More specifically, as shown in Figures 3 and 9, filling begins by pressurizing grout G into one communication passage 58C arbitrarily selected from the plurality of communication passages 58. In the example shown in Figure 3, the lowest beam reinforcement joint 54 provided on the right side of the drawing is designated as one beam reinforcement joint 54C, and as shown in Figure 9, one of the two communication passages 58 provided for that one beam reinforcement joint 54C is designated as the one communication passage 58C, and grout G is pressurized into that one communication passage 58C. Then, as shown by arrow DR1, grout G is first filled into the internal space of the one beam reinforcement joint 54C through the one communication passage 58C. The grout G then flows out of the internal space of the beam reinforcement joint 54C into the joint space ZS as shown by arrow DR2. At the same time, the grout G passes through the other communicating passages 58 other than the communicating passage 58C provided in the beam reinforcement joint 54C from the internal space of the beam reinforcement joint 54C and is discharged to the outside as shown by arrow DR3. If it is confirmed that grout G has been discharged to the outside from the communicating passage 58, the openings of the communicating passages 58 provided on the surfaces 51s, 51t of the beam member 5 are closed to prevent further discharge of grout G.

[0035] As described above, when grout G flows from the internal space of one beam reinforcing bar joint 54C into the joint space ZS, the joint space ZS is blocked below and to the sides by the joint formwork 90, so the outflowing grout G accumulates and fills inside the joint formwork 90. ​​As the grout G continues to fill the inside of the joint formwork 90, the upper surface of the grout G in the joint space ZS rises and reaches the height at which other beam reinforcing bar joints 54 are installed, other than the one beam reinforcing bar joint 54C. Then, as shown by arrow DR4, the grout G flows into the internal space of the other beam reinforcing bar joint 54. After flowing into the internal space of the other beam reinforcing bar joint 54, the grout G passes through the connecting passage 58 that communicates with the internal space of the other beam reinforcing bar joint 54, as shown by arrow DR5, and is then discharged from the surfaces 51s, 51t of the beam member 5. For the communication passages 58 in which it has been confirmed that the grout G has been discharged to the outside, the openings provided on the surfaces 51s and 51t of the beam member 5 are closed. In this manner, filling of the grout G into the one communication passage 58C continues until it is confirmed that the grout G has been discharged from all communication passages 58 other than the one communication passage 58C. After it is confirmed that the grout G has been discharged from all communication passages 58 other than the one communication passage 58C, filling of the grout G is stopped.

[0036] (Installation process of other pillar components) FIG. 10 is a vertical cross-sectional view showing another pole member installation step. Next, as shown in Figure 10, another column member 2B is installed at a position separated from the first column member 2A. In this case, if a column member 2B of a lower floor is already installed below the other column member 2B to be installed, the upper end of the column main reinforcement 22 of the column member 2B of the lower floor is inserted from below into the lower part of the column reinforcement joint part 23 of the other column member 2B.

[0037] (On-site concrete beam formation process) After the other beam member installation process described above, as shown in Fig. 1, concrete is poured between the other beam end 5t of the beam member 5 and the other column member 2B, and on the second concrete portion 51B of the beam member 5, to construct a cast-in-place concrete beam portion 7. In this way, the other column member 2B and the beam member 5 are joined, and the floor slab of the upper floor is constructed. The column-beam structure 1 is constructed from bottom to top by repeating the above-mentioned column member installation process, beam member installation process, grout filling process, other column member installation process, and on-site concrete beam section formation process on each floor in sequence.

[0038] The method for constructing a column-beam frame as described above is a method for constructing a column-beam frame by joining precast concrete column members 2 and beam members 5 to construct a column-beam frame 1, wherein the column member 2 has a protruding portion 25 formed protruding from the side surface 21s of the column member 2, and includes a column member installation process for installing the column member 2, a beam member installation process for moving the beam member 5 laterally so that a tip surface 25f of the protruding portion 25 faces the end surface 5f of the beam member 5 to form a joint space ZS, and a grout filling process for providing a joint formwork 90 to close the below and sides of the joint space ZS and filling the joint space ZS with grout G, and in the beam member installation process, the position of the beam member 5 is determined so that when the end surface 5f of the beam member 5 faces the tip surface 25f of the protruding portion 25, the bottom surface and side surface of the protruding portion 25 and the beam member 5 each extend in the same plane. According to the above-described configuration, in the beam member installation step, the beam member 5 is moved laterally and positioned so as to form a joint space ZS between the tip end surface 25f of the protruding portion 25 formed by protruding from the side surface 21s of the column member 2 and the end surface 5f of the beam member 5. In this case, the position of the beam member 5 is determined so that when the end surface 5f of the beam member 5 is positioned opposite the tip end surface 25f of the protruding portion 25, the lower surface and side surface of each of the protruding portion 25 and the beam member 5 extend in the same plane. Therefore, when the joint form 90 is installed to close the lower and lateral sides of the joint space ZS and grout G is filled into the joint space ZS, the joint form 90 can be installed, for example, so as to straddle the joint space ZS and follow both the underside of the protrusion 25 and the underside of the beam member 5, and so as to straddle the joint space ZS and follow both the side of the protrusion 25 and the side of the beam member 5, thereby allowing the joint form 90 to be in surface contact with each surface. This allows the joint form 90 to be tightened and fixed from the outside by, for example, providing a tightening band or frame material to surround the joint form 90 from the outside at the surface contact portion, thereby facilitating installation of the joint form 90. Furthermore, because the joint form 90 is in surface contact with each surface as described above, the outflow of grout G can be effectively suppressed. This allows grout G to be easily filled. In this way, it is possible to realize a method for constructing a column-beam frame that allows grout G to be easily filled into the joint space ZS between the column member 2 and the beam member 5 when joining the beam member 5 to the precast concrete column member 2 from the side.

[0039] Furthermore, at one beam end 5s joined to the column member 2A, the beam member 5 is formed as a fully precast concrete structure, with both the lower beam main reinforcement 52B provided on the lower side and the upper beam main reinforcement 52A provided on the upper side embedded in concrete 51, while at the beam center 5c and the other beam end 5t, the lower beam main reinforcement 52B is embedded in concrete 51 and the upper beam main reinforcement 52A is exposed above the concrete 51, with the beam member 5 formed as a half precast concrete structure. According to this configuration, one beam end 5s to be joined to the column member 2A is formed as a fully precast concrete structure in which both the lower beam main reinforcements 52B and the upper beam main reinforcements 52A are embedded in concrete 51. Therefore, when joining the beam member 5 to the column member 2A by joining the connecting beam main reinforcements 27A, 27B embedded in the column member 2A to the beam main reinforcements 52A, 52B of the beam member 5, both the lower beam main reinforcements 52B and the upper beam main reinforcements 52A can be used to join the connecting beam main reinforcements 27A, 27B. This allows the beam member 5 to be firmly joined to the column member 2A. Furthermore, because the other beam end 5t side is formed as a half-precast concrete structure, when concrete is poured above it, the floor slab of the upper floor can be formed simultaneously and integrally, which makes construction easier and allows for a strong connection between the beam member 5 and the floor slab.

[0040] The method for constructing the column-beam structure 1 further includes an other column member installation process in which the column member 2 installed in the column member installation process is regarded as one column member 2A, and another column member 2B is installed at a position spaced apart from the one column member 2A, and an in-situ poured concrete beam section formation process in which concrete is poured between the other beam end 5t of the beam member 5 opposite to the one beam end 5s joined to the one column member 2A and the other column member 2B to form a poured-in-place concrete beam section 7, and the other column member 2B is joined to the beam member 5; the column member installation process, beam member installation process, other column member installation process, grout filling process, and poured-in-situ concrete beam section formation process are repeatedly performed to construct the column-beam structure 1 from the bottom up. According to this configuration, another column member 2B is installed at a position separated from the one column member 2A installed in the column member installation step, and concrete is poured between the other column member 2B and one beam end portion 5t on the opposite side of the one beam end portion 5s joined to the one column member 2A, to form a cast-in-place concrete beam portion 7. In this way, a column-beam frame 1 in which the one column member 2A and the other column member 2B are connected by the beam member 5 can be easily constructed.

[0041] (Modification of the embodiment) Next, a modified example of the method for constructing the beam-column frame shown in the above embodiment will be described. FIG. 11 is a vertical cross-sectional view showing another column member installation step in the method for constructing a beam-column frame according to a modified embodiment of the present invention. As shown in FIG. 11 , in the method for constructing a beam-column frame in this modification, after installing one column member 2A in a predetermined position in the column member installation step similar to the above embodiment, another column member installation step is performed before installing the beam member 5. To do this, another column member 2C is installed at a position spaced apart from the first column member 2A. In this case, the vertical height of the concrete section 21 of the column member 2C to be installed is set to be shorter than that of the concrete section 21 of the first column member 2A. In the subsequent beam member installation step, the beam member 5 is suspended and positioned at a certain horizontal distance from the protruding portion 25 to insert the connecting beam main reinforcements 27A, 27B protruding from the protruding portion 25 into the beam reinforcement joint portion 54 of the beam member 5. The concrete section 21 of the column member 2C is set at a height that does not interfere with the beam member 5 and does not hinder the work.

[0042] FIG. 12 is a vertical cross-sectional view showing a beam member installing step in a method for constructing a beam-column frame according to a modified embodiment of the present invention. Next, as shown in Figure 12, in the same manner as in the beam member installation process of the above embodiment, the beam member 5 is suspended and placed in a position horizontally facing the protruding portion 25 of one of the column members 2A. Next, the beam member 5 is moved laterally, and the connecting beam main reinforcements 27A, 27B protruding from the protruding portion 25 are inserted into each of the multiple beam reinforcement joints 54. The beam member 5 is then positioned facing the tip surface 25f of the protruding portion 25 of the one of the column members 2A and the end surface 5f of the beam member 5, with a predetermined gap, i.e., joint space ZS, between them. At this time, because the height of the concrete portion 21 of the other column member 2C is set low, the operation of joining the beam member 5 to the one of the column members 2A can be easily performed.

[0043] FIG. 13 is a vertical cross-sectional view showing a state subsequent to FIG. 12 in a method for constructing a beam-column frame according to a modified embodiment of the present invention. Next, as shown in Fig. 13, a precast concrete beam-column connection member 2J is installed on top of and joined to another column member 2C (column-beam connection member installation process). The column-beam connection member 2J includes a concrete portion 21J and connecting beam main reinforcements 27A, 27B embedded in the concrete portion 21J. Like the column member 2, the column-beam connection member 2J includes a protruding portion 25 formed to protrude from the side surface 21s of the column-beam connection member 2J. In addition, the concrete portion 21J is formed with an insertion hole 21h through which the upper end of the column main reinforcement 22 of the column member 2C is inserted in the vertical direction. Such a beam-column joint member 2J is installed by placing the concrete part 21J on the concrete part 21 of another column member 2C. At this time, the upper end parts of the column main reinforcements 22 of the column member 2C are inserted into the insertion holes 21h of the concrete part 21J. In addition, a grout material (not shown) is filled in the gaps between the concrete part 21 of the other column member 2C and the concrete part 21J, and between the insertion holes 21h and the upper end parts of the column main reinforcements 22 inserted into the insertion holes 21h. In this way, the other pillar member 2C is extended upward to the same height as the first pillar member 2A.

[0044] Thereafter, as in the above embodiment, a joint Z is formed by filling grout into the joint space ZS formed between the tip surface 25f of the protrusion 25 of one of the column members 2A and the end surface 5f of the beam member 5, and the one of the column members 2A and the beam member 5 are joined (grout filling process). In addition, concrete is poured between the other beam end 5t of the beam member 5 and the column-beam joint member 2J, and on the second concrete portion 51B of the beam member 5, to construct a cast-in-place concrete beam portion 7 (cast-in-place concrete beam portion formation process).

[0045] The column-beam structure is constructed from bottom to top by repeating the above-mentioned column member installation process, other column member installation process, beam member installation process, grout filling process, column-beam joint member installation process, and on-site concrete beam section formation process on each floor in sequence.

[0046] As described above, the method for constructing a column-beam frame of this modified example further includes: an other column member installing step, in which the column member 2 installed in the column member installing step is defined as one column member 2A, and another column member 2C having a height shorter than the one column member 2A is installed at a position spaced apart from the one column member 2A; a column-beam connection member installing step, in which a column-beam connection member 2J is installed on the other column member 2C after the beam member installing step; and a cast-in-place concrete beam portion forming step, in which concrete is poured between the one beam end portion 5t of the beam member 5 opposite to the one beam end portion 5s joined to the one column member 2A and the column-beam connection member 2J to form a cast-in-place concrete beam portion 7, and joins the column-beam connection member 2J and the beam member 5; and the column member installing step, the other column member installing step, the beam member installing step, the column-beam connection member installing step, the grout filling step, and the cast-in-place concrete beam portion forming step are repeatedly performed to construct the column-beam frame 1 from the bottom up. According to the above-described configuration, before installing the beam member 5, both the one column member 2A and the other column member 2C to which the beam ends 5s, 5t of the beam member 5 are joined can be erected, for example, at the same time. This allows construction to be carried out efficiently and shortens the construction period. Furthermore, since the other column member 2C is shorter in height than the one column member 2A to which the beam member 5 is directly joined, even when the beam member 5 is installed after the other column member 2C is erected as described above, the possibility that the other column member 2C will hinder the work is reduced. Therefore, construction can be carried out easily.

[0047] The method for constructing a beam-column frame of the present invention is not limited to the above-described embodiment and modified examples explained with reference to the drawings, and various modified examples are conceivable within the technical scope. For example, in the above embodiment and modified example, each step has been described as a method for constructing the beam-column frame 1, but the order in which these steps are performed and the detailed procedures can be changed as appropriate. In the above embodiment, the beam member 5 is formed as a full precast concrete structure in which both the lower beam main reinforcement 52B and the upper beam main reinforcement 52A are embedded in the first concrete portion 51A at one beam end 5s, and as a half precast concrete structure in which the lower beam main reinforcement 52B is embedded in the second concrete portion 51B and the upper beam main reinforcement 52A is exposed above the concrete 51A at the beam center 5c and the other beam end 5t, but this is not limited to this. The other beam end 5t of the beam member 5 may also be a full precast concrete structure in which both the lower beam main reinforcement 52B and the upper beam main reinforcement 52A are embedded in the first concrete portion 51A, as with the one beam end 5s. In addition to this, it is possible to select and discard the configurations given in the above embodiments and modifications, or to change them to other configurations as appropriate, without departing from the spirit of the present invention. [Explanation of symbols]

[0048] 1 Column beam frame 5t Other beam end 2, 2A~2C Pillar members 51 Concrete 2A One column member 52 Main beam reinforcement 2B, 2C Other column members 52A Upper beam main reinforcement 21s Side 52B Lower beam main reinforcement 25 Protrusion 7 Cast-in-place concrete beam 25f Tip face 90 Joint formwork 5 Beam member G Grout 5c Beam center Z joint 5f End face ZS joint space 5s One end of the beam

Claims

1. A method for constructing a column-beam frame by joining precast concrete column members and beam members, The pillar member includes a protrusion formed to protrude from a side surface of the pillar member, a pillar member installation step of installing the pillar member; A beam member installation process in which the beam member is moved laterally and arranged so as to form a joint space between the tip surface of the protrusion and the end surface of the beam member; A grout filling process includes providing a joint formwork so as to close the lower and lateral sides of the joint space and filling the joint space with grout, At one beam end portion connected to the column member, the beam member is formed as a full precast concrete structure in which both the lower beam main reinforcement provided on the lower side and the upper beam main reinforcement provided on the upper side are embedded in concrete, and at the beam center portion and the other beam end portion, the lower beam main reinforcement is embedded in concrete and the upper beam main reinforcement is exposed above the concrete, and the beam member is formed as a half precast concrete structure, and the lower beam main reinforcement is provided to protrude from the other beam end portion, In the beam member installation step, the position of the beam member is determined so that when the end face of the beam member faces the tip face of the protrusion, the lower surface and the side surface of each of the protrusion and the beam member extend in the same plane. A method for constructing a column-beam structure.

2. another pole member installation step of setting the pole member installed in the pole member installation step as one pole member and installing another pole member at a position spaced apart from the one pole member; a poured-in-place concrete beam portion forming process, in which concrete is poured to form a poured-in-place concrete beam portion so as to embed the upper main beam reinforcement, the lower main beam reinforcement, and a beam reinforcement joint portion that joins the upper main beam reinforcement and the lower main beam reinforcement, between the other beam end portion of the beam member opposite to the one beam end portion joined to the one column member and the other column member, and then joining the other column member and the beam member; and The column member installation process, the beam member installation process, the other column member installation process, the grout filling process, and the on-site concrete beam portion formation process are repeatedly performed to construct the column-beam frame from bottom to top. A method for constructing a beam-column structure according to claim 1.

3. An other pillar member installation process in which the pillar member installed in the pillar member installation process is regarded as one pillar member, and another pillar member having a height shorter than the one pillar member is installed at a position spaced apart from the one pillar member; a column-beam connection member installation step of installing a column-beam connection member on the other column member after the beam member installation step; A poured-in-place concrete beam portion forming process for forming a poured-in-place concrete beam portion by pouring concrete between the other beam end portion of the beam member opposite to the one beam end portion joined to the one column member and the column-beam joint member, and joining the column-beam joint member and the beam member; and The column member installation process, the other column member installation process, the beam member installation process, the column-beam joint member installation process, the grout filling process, and the on-site concrete beam portion formation process are repeatedly performed to construct the column-beam frame from bottom to top. A method for constructing a beam-column structure according to claim 1.

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