Column-beam joint construction

Abstract

To provide a beam support member used in a column-beam joining method for a building, which can support a beam member with a simple configuration.SOLUTION: A column-beam joining structure is configured using: columns made of column members 11a to 12c made of precast concrete; and beam members 20 made of the precast concrete joined to these columns. The column member 11c (12c) on an upper floor is joined onto the column member 11b (12b). The beam member 20 supported using the column member 12b on the same floor as the column member 11b (12b) as a timbering is slid toward the column member 11c (12c) and joined to the column member 11c (12c).SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention is used in a method for joining columns and beams in a building using members made of precast concrete. Column beam joint structure Regarding. [Background technology]

[0002] Conventionally, when constructing a building, precast concrete column and beam members manufactured in advance in a factory have sometimes been used to reduce the amount of concrete pouring on-site (see, for example, Patent Document 1). In the beam-column joint structure described in this document, a horizontal through-hole is formed in the column joint of the PCa (precast concrete) column, a beam connection rebar protrudes from one longitudinal end face of the girder, and multiple mechanical joints for connecting the beam main reinforcing bars are installed inside the other end face. Furthermore, the beam connection rebars of the girder are passed through the through-holes in the column joint of the PCa column and inserted into the already installed mechanical joints for connecting the beam main reinforcing bars of the adjacent girder, thereby joining the girders via the column joint. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-225897 Summary of the Invention [Problem to be solved by the invention]

[0004] When connecting beam members to column members by sliding them, it is necessary to install shoring below the area where the beam members will be installed. This shoring is made up of a combination of temporary equipment such as supports, horizontal ties, jack bases, and braces to withstand the load of the beam members. After connecting the beam columns, the shoring used is removed. However, if the shoring supporting the beam members is complex and the temporary equipment is large, the installation and removal work can be time-consuming and costly. [Means for solving the problem]

[0005] To solve the above problems Column beam joint structure teeth, A beam-column joint structure for a building in which a beam member made of precast concrete is joined to a joint portion of a plurality of columns formed by joining a plurality of precast concrete column members, and the beam member is joined to the column by sliding the beam member made of precast concrete horizontally at the height of the upper surface of the column member located immediately below the joint portion using a beam support member, wherein the beam support member comprises a mounting plate attached to the side of the column member in contact with the side of the column member, a top plate fixed at the upper end of the mounting plate so as to be perpendicular thereto and having holes formed therein, a plurality of side plates fixed to the mounting plate and the top plate, a support plate arranged parallel to the top plate and supporting the sliding beam member on its upper surface, and a support member attached to the support plate. The mounting plate is provided with a first nut fixed to the underside of a support plate, a second nut provided on the upper plate, and a height adjustment bolt that is inserted into the hole in the upper plate and the second nut, and has an upper end that screws into the first nut and changes the screwing position with the second nut, thereby adjusting the distance between the upper plate and the support plate, wherein the height adjustment bolt has a length that allows the distance of the support plate from the upper plate to be adjusted to a height where the upper surface of the support plate is flush with the upper surface of the pillar member when the mounting plate is fixed to the side of the pillar member, and the beam member is slid while the upper surface of the support plate and the upper surface of the pillar member are flush with each other. [Effects of the Invention]

[0006] According to the present invention, the beam member can be supported with a simple configuration. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 2 is an explanatory diagram illustrating a column-beam joint structure according to an embodiment. [Figure 2] 1A and 1B are explanatory diagrams of the main parts of a column-beam joint structure in an embodiment, where (a) is a perspective view of a column member and (b) is a perspective view of a beam member. [Figure 3] 1 is a perspective view of a main part illustrating the mounting state of a beam support member used in a column-beam joining method according to an embodiment. FIG. [Figure 4] 5A and 5B are explanatory views of the configuration of a beam-receiving member in an embodiment, in which FIG. 5A is a front view and FIG. 5B is a side view. [Figure 5] An explanatory diagram illustrating a method for joining columns and beams in an embodiment, in which (a) shows the state after the floor has been formed, (b) shows the state after joining the end column members and joining the beam members to them, (c) shows the state after joining the column members, and (d) shows the state after joining the beam members. [Figure 6] FIG. 10 is a side view illustrating the configuration of a beam receiving member in a modified example. [Figure 7] FIG. 10 is an explanatory diagram illustrating the main parts of a column-beam joint structure in a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0008] Below, using Figures 1 to 5, we will explain the method used for joining columns and beams in buildings. Column beam joint structure An embodiment that embodies the above will be described. As shown in FIG. 1, the beam-column joint structure 10 of this embodiment is composed of multiple columns 11, 12, and 13 and multiple beam members 20 arranged between the columns. Each column 11, 12, and 13 is formed by stacking column members 11a, 11b, 11c, 12a, 12b, and 12c made of precast concrete. In this beam-column joint structure 10, joints are integrally formed at the lower ends of the column members 11a to 12c, and beam members 20 are joined to the joints. The column members 11a to 11c are arranged at the ends of the building and are joined to the beam members 20 from one direction, while the column members 12a to 12c are joined to the beam members 20 from both directions. Therefore, the column members 11a to 11c have the same structure, and mechanical joints for the joints are embedded only on one side. The column members 12a to 12c also have the same structure, and through holes 17 are formed on both sides of the joints. Since pillar members 11a to 11c and pillar members 12a to 12c have the same structure except for the configuration of the mechanical joint and the through hole 17 at the joint section, pillar member 12b will be described in detail, and detailed descriptions of the other pillar members 11a to 11c, 12a, and 12c will be omitted.

[0009] The column member 12b shown in Fig. 2(a) is made of precast concrete. A plurality of mechanical joints 15 are embedded in the upper end of the column member 12b, extending in the vertical direction (axial direction). These mechanical joints 15 are connected to the column main reinforcement bars built into the column member 12b. Furthermore, these mechanical joints 15 are joined to the column member 12c arranged above the column member 12b. The column main reinforcement bars 16 of the column member 12b protrude from the underside of the column member 12b and are joined to the column member 12a arranged below.

[0010] Furthermore, a joint portion 12J is formed at the lower part of the column member 12b. In this embodiment, the joint portion 12J is provided at a position where the lower surface of the column member 12b is flush with the lower surface of the beam member 20. A through hole 17 is formed in the joint portion 12J to join the main beam reinforcement 22 of the beam member 20. This through hole 17 extends horizontally and opens on both side surfaces.

[0011] The beam member 20 shown in FIG. 2(b) is also made of precast concrete. A plurality of mechanical joints 21 are embedded in one side of the beam member 20 (the right side in the figure). Furthermore, a plurality of main beam reinforcements (not shown) are built into the beam member 20. A plurality of main beam reinforcements 22 embedded in the beam member 20 protrude from the other side (the left side) of the beam member 20. When the main beam reinforcements 22 are joined to a column member 12b, they have a length corresponding to the through-holes 17 of the column member 12b and the mechanical joints 21 of the adjacent beam member 20 to be joined. When the main beam reinforcements 22 are joined to a column member 11b, they have a length corresponding to the mechanical joints of the column member 11b.

[0012] (Beam support member) Next, the configuration of the beam support hardware 30 used in the beam-to-column joining method will be described with reference to Figures 3 and 4. The beam support hardware 30 is used as part of the support structure that supports the beam member 20.

[0013] As shown in Figure 3, two beam support hardware 30 are attached spaced apart to the side of the column member 12b where the beam member 20 is to be installed. Each beam support hardware 30 includes a main body 31, a height adjustment bolt 35, and a support plate 36. By adjusting the height adjustment bolt 35, the upper surface of the support plate 36 is set to the same height as the upper surface of the column member 12b. This allows the upper surface of the support plate 36 to support the lower surface of the beam member 20.

[0014] As shown in Figures 4(a) and (b), the main body 31 of the beam support hardware 30 includes a mounting plate 32, a top plate 33, two side plates 31a, and a connecting plate 34. The mounting plate 32 has two holes 32a and 32b that come into contact with the column member 12b. The mounting plate 32 is brought into contact with the side of the column member 12b, and bolts B1 are passed through the holes 32a and 32b to secure the beam support hardware 30. A nut 33a is fixed onto the top plate 33. The top plate 33 has a hole formed therein that aligns with the screw hole of the nut 33a. The connecting plate 34 is a plate that connects the centers of the two side plates 31a.

[0015] The upper end of the height adjustment bolt 35 is screwed into a nut 36a fixed to the underside of the support plate 36. The lower end of the height adjustment bolt 35 is screwed into and inserted into a nut 33a on the upper plate 33. The height of the support plate 36 relative to the main body 31 can be adjusted by changing the screwing position of the height adjustment bolt 35 and the nut 33a.

[0016] (Column beam connection method) Next, a column-to-beam joining method will be described with reference to Fig. 5. Here, the column member 11b corresponds to the first column member, the column members 11c and 12c correspond to the second column member, and the column member 12b corresponds to the first column member and the third column member.

[0017] As shown in Figure 5(a), beam members 20 are joined to the lower ends of column members 11b, 12b erected on top of column members 11a, 12a, and a floor slab or the like is placed on top of this beam member 20 to construct floor F1. In this case, the lower floor F1 is constructed so that the upper parts of column members 11b, 12b protrude from floor F1. By constructing this floor F1, column members 11b, 12b are firmly fixed to the frame of the lower floor. In addition, the upper ends of each column member 11b, 12b have an open top surface.

[0018] 5(b), the column member 11c of the floor above the column member 11b is joined. In this case, the column member 11c is lowered, and the column main reinforcement bars 16 protruding downward are inserted into the mechanical joints 15 of the column member 11b, and grout is injected.

[0019] Next, the beam support hardware 30 is installed on the side surfaces of the pillar members 11b and 12b corresponding to the positions where the beam members 20 are to be arranged. 3, beam support hardware 30 is installed on the side surfaces of column member 11b and column member 12b corresponding to the arrangement position of beam member 20. The beam support hardware 30 installed on the side surface of column member 12b corresponds to the beam support member, and the beam support hardware 30 installed on the side surface of column member 11b corresponds to the beam support auxiliary member.

[0020] Next, as shown in Figure 5(b), a crane is used to place the beam member 20 on the upper surface of the column member 12b and on the upper surface of the support plate 36 of the beam support hardware 30. Then, the main beam reinforcement 22 of the beam member 20 is inserted into the mechanical joint extending horizontally of the column member 11c, and the beam member 20 is slid toward the column member 11c. Next, grout is injected into the mechanical joint to fix the main beam reinforcement 22 to the mechanical joint.

[0021] Next, as shown in Fig. 5(c), the column member 12c is joined to the column member 12b. Here, similar to the joining of the column members 11b and 11c, the column member 12c is lowered and the column main reinforcement bars 16 protruding downward are inserted into the mechanical joints 15 of the column member 12b. Here, as shown in FIG. 5(d), the through-hole 17 of the joint portion 12J of the column member 12c joined onto the column member 12b is arranged at a position that aligns with the mechanical joint 21 of the beam member 20.

[0022] Furthermore, beam support hardware 30 is installed on the side surface of column member 12b corresponding to the position of the beam member 20 to be joined next. Then, a crane is used to place the beam member 20 on the upper surface of column member 12b and on the upper surface of the support plate 36 of the beam support hardware 30. Then, the beam member 20 is slid horizontally toward column member 12c so that the main beam reinforcement 22 of the beam member 20 is inserted into the through-hole 17 of column member 12c and the mechanical joint 21 of the beam member 20. Next, grout is injected into the mechanical joint 21 and the through-hole 17 to fix the main beam reinforcement 22 to the mechanical joint 21 and the through-hole 17.

[0023] Thereafter, on this floor, as described above, the first step of joining the column member 12c onto the column member 12b and the second step of sliding and joining the beam member 20 to the joint portion 12J of the column member 12c arranged above are repeated alternately. These steps are repeated up to the top floor to construct the column-beam joint structure 10. Note that the beam support hardware 30 may be removed when the installation of the beam members 20 on the same floor has been completed, and used to install the beam members 20 on the floor above.

[0024] (action) The column member 12b protruding upward from the floor F1 of the building extends to the height of the beam member 20. Therefore, by providing a beam support metal fitting 30 to this column member 12b, the beam member 20 can be supported without the need to provide a large-scale support structure separate from the column member 12b.

[0025] According to this embodiment, the following effects can be obtained. (1) The beam-column joint structure 10 of this embodiment is configured by combining a beam member 20 made of precast concrete and column members 11a to 12c. In this case, in order to join the beam member 20 to the column members 11c and 12c, the column member 12b is used as part of the support that supports the beam member 20. This simplifies the configuration of the support, thereby reducing work time and costs.

[0026] (2) In this embodiment, a beam support metal fitting 30 is provided on the column member 12b used as part of the support structure supporting the beam member 20. As a result, unlike conventional cases, there is no need to provide support structure separate from the column member, and the beam member 20 can be stably supported by the column member 12b and the beam support metal fitting 30 provided thereon.

[0027] (3) In this embodiment, the beam support hardware 30 is also provided on the column members 11b, 12b arranged below the column members 11c, 12c to which the beam member 20 is joined. This allows the beam member 20 to be stably joined to the column members 11c, 12c.

[0028] (4) In this embodiment, the beam support hardware 30 includes a support plate 36 whose height can be adjusted using a height adjustment bolt 35. This allows the height of the lower surface of the beam member 20 and the support plate 36 to be easily adjusted.

[0029] (5) In this embodiment, the column member 12b has a joint 12J at its lower end. As a result, the height of the lower surface of the joined beam member 20 is the same as the height of the lower surface of the column member 12c. Therefore, by placing the beam member 20 on the upper surface of the column member 12b that is disposed below the column member 12c, it is possible to omit adjusting the height of the beam member 20.

[0030] (6) In this embodiment, the column members 11a to 12c and the beam member 20 are made of precast concrete, which reduces the amount of concrete pouring required on-site while constructing the beam-column joint structure 10.

[0031] This embodiment can be modified as follows: This embodiment and the following modifications can be combined and implemented within the scope of technical compatibility. In the above embodiment, the beam support hardware 30 that supports the beam member 20 includes a main body 31, a height adjustment bolt 35, and a support plate 36. The configuration of the beam support hardware 30 is not limited as long as the column member 12b can be used as part of the support that supports the beam member 20. For example, if the beam member 20 is heavy, the number of points or areas that support the beam member 20 may be increased.

[0032] As shown in FIG. 6, the beam member 20 may be supported by a beam support hardware 30, a support member 40, and a fixing member 50. In this case, fixing portions (screw holes) for fixing the beam support hardware 30 and the fixing member 50 are provided in the column member 12b. The support member 40 is disposed at a position distant from the column member 12b used as part of the support structure, and supports the beam member 20. Like the beam support hardware 30, this support member 40 includes a height adjustment bolt 45 and a support plate 46. The support member 40 is connected and fixed to the beam support hardware 30 via a connecting member 47, and is fixed to a fixing member 50 fixed to the lower side surface of the column member 12b via a pivot fixing portion 42, a connecting member 57, and a pivot fixing portion 52. This allows the beam member 20 to be firmly supported by the beam support hardware 30 and the support member 40.

[0033] Furthermore, the beam support hardware 30 may be configured without the support plate 36, height adjustment bolt 35, and nut 33a. In this case, the beam support hardware 30 is attached so that the height of the upper plate 33 of the main body 31 is aligned with the upper surface of the column member 12b. Also, the beam support hardware 30 may be installed in the center or lower part of the column member 12b by lengthening the height adjustment bolt 35.

[0034] Furthermore, if the column member 12b can be used as part of the support structure that supports the beam member 20, the beam support hardware 30 may be omitted. For example, if the beam member 20 can be supported by the through-holes 17 into which the main beam reinforcement 22 of the beam member 20 is inserted, the beam support hardware 30 provided on the columns 11, 12 on the side where the beam member 20 is slid closer may be omitted.

[0035] In the above embodiment, the joint 12J is provided at the lower end of the pillar member 12b. The pillar member 12b does not have to have the joint 12J. In this case, for example, the joint may be made of precast concrete separate from the pillar member.

[0036] Furthermore, the position of the joint portion 12J is not limited to the lower end portion of the pillar member 12b. As shown in Fig. 7, a joint 62J may be provided in the central region of the column member 62. In this case, a beam support hardware 80 having a height sufficient to support the underside of the beam member 70 is provided on the side of the column member 62. This beam support hardware 80 is provided on the upper part of the column member 62 and has a support member that extends up to a support surface at the height of the underside of the joint 62J. Therefore, a column member having a joint and a portion above this can be used as part of the support that supports the beam member 70.

[0037] In the beam member 20 of the above embodiment, the mechanical joint 21 is embedded in one side end portion, and the main beam reinforcement 22 protrudes from the other side end portion. The arrangement of the mechanical joint 21 in the beam member 20 is not limited to this.

[0038] 7, a beam member 70 may have mechanical joints 71, 72 embedded at both ends. In this case, reinforcing bars 75 are inserted into the mechanical joints 71, 67 of the beam member 70 and column member 62 that have already been installed, causing the reinforcing bars 75 to protrude from the column member 62. Then, the beam member 70 is slid so that the protruding reinforcing bars 75 are inserted into the mechanical joints 72. Furthermore, the beam member 20 in the above embodiment is made of precast concrete in which reinforcing bars are embedded in the concrete. This beam member may also be made of half precast concrete in which the upper reinforcing bars are exposed.

[0039] In the column members 11a to 12c of the above embodiment, the column main reinforcements 16 protrude downward and the mechanical joints 15 are disposed at the upper ends. The configuration of the column members 11a to 12c is not limited to this.

[0040] For example, as shown in Fig. 7, in a column member 62, column main reinforcement bars 66 may be protruded from the upper surface, and a mechanical joint 65 may be embedded at the lower end. Furthermore, a column member may have only a mechanical joint embedded without protruding column reinforcing bars. In this case, the column members are joined together using separate reinforcing bars. [Explanation of symbols]

[0041] B1...bolt, F1...floor, 10...column-beam joint structure, 11, 12, 13...column, 11a, 11b, 11c, 12a, 12b, 12c, 62...column member, 12J, 62J...joint portion, 15, 21, 65, 67, 71, 72...mechanical joint, 16, 66...column main reinforcement, 17...through hole, 20, 70...beam member, 22...beam main reinforcement, 30, 80...beam support hardware, 31...main body, 31a...side panel, 32...mounting plate, 32a, 32b...hole, 33...top panel, 33a, 36a...nut, 34...connecting plate, 35, 45...height adjustment bolt, 36, 46...support plate, 40...support member, 42, 52...rotating fixing portion, 47, 57...connecting member, 50...fixing member, 75...reinforcing bar.

Claims

1. A column-beam joint structure for a building in which a beam member made of precast concrete is joined to a joint portion of a plurality of columns formed by joining a plurality of precast concrete column members, by sliding the beam member made of precast concrete horizontally at the height of the upper surface of the column member arranged directly below the joint portion using a beam support member, The beam receiving member is a mounting plate attached to the side surface of the pillar member in contact therewith; an upper surface plate having a hole formed therein and fixed perpendicularly to an upper end of the mounting plate; a plurality of side plates fixed to the mounting plate and the top plate; a support plate that is arranged parallel to the upper surface plate and supports the sliding beam member on an upper surface thereof; a first nut fixed to a lower surface of the support plate; a second nut provided on the upper surface plate; a height adjustment bolt that is inserted into the hole in the upper plate and the second nut, has an upper end that screws into the first nut, and changes a screwing position with the second nut to vary the distance between the upper plate and the support plate, the height adjustment bolt has a length that allows the distance of the support plate relative to the upper surface plate to be variable up to a height at which the upper surface of the support plate is flush with the upper surface of the pillar member when the mounting plate is fixed to the side surface of the pillar member, A column-beam joint structure, characterized in that the beam member is slid while the upper surface of the support plate and the upper surface of the column member are flush with each other.

2. The mounting plate is formed with a plurality of holes of different heights, 2. The column-beam joint structure according to claim 1, wherein a bolt for fixing the column member and the mounting plate passes through the hole.

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