Frame structure using pca beam-column member and construction method thereof

Abstract

To reduce the width dimension of a beam member by allowing a main beam reinforcement to protrude from the beam member only on one side.SOLUTION: The present invention comprises two PCa columns, two PCa girder beams placed on the two PCa columns, each having a column-beam joint and a pair of girder beam parts provided on both sides of the column-beam joint in the girder direction, and an orthogonal beam including a PCa orthogonal beam that is spanned between the column-beam joints of the two PCa girder beams. A main reinforcement of the PCa orthogonal beam protrudes from both end faces in the axial direction. A joint reinforcing bar is embedded in the column-beam joint of at least one PCa girder beam so as to protrude from a side surface opposite to the side surface facing the PCa orthogonal beam. A mechanical joint is embedded in the column-beam joint of one PCa girder beam, and a hole is provided in the column-beam joint of the other PCa girder beam into which the main reinforcement protruding from one end surface of the PCa orthogonal beam near the column-beam joint can be inserted so that a tip of the main reinforcement is held by a second holding part of the mechanical joint.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a frame structure using precast concrete (referred to as "PCa") column-beam members and a construction method thereof.

Background Art

[0002] Various frame structures using PCa column-beam members have been proposed. In such frame structures, mechanical joints are often used for joining steel bars between PCa members. As a conventional frame structure adopting a mechanical joint, a joining steel bar protrudes from the side surface of the joint portion of a jointed beam member, and a beam (hereinafter referred to as a "cross beam") spanning between the joining steel bar and two jointed beam members protrudes from the end surface of the beam main bar. The main bar of the beam and the main bar of the beam protruding from the end surface of the beam are joined by a mechanical joint, and cast-in-place concrete is placed in the space between the steel bar protruding surfaces of each of the jointed beam member and the cross beam and the main bar protruding surface of the beam main bar. This is the mainstream.

[0003] However, from the viewpoint of structural safety, mechanical joints of beam main bars are generally arranged outside the plastic hinge region. For example, as shown in FIG. 11, the protruding length L of the beam main bar 131 protruding from the side surface 104 of the joint portion of the jointed beam member 103 is increased so that the mechanical joint 135 is located in a region outside the plastic hinge region. The mechanical joint 135 joins the tip of the beam main bar 131 and the tip of the beam main bar 155 protruding from the end surface near the jointed beam member 103 of the cross beam (not shown) so as to be located outside the plastic hinge region.

[0004] Known documents using the technique of joining steel bars of beam members using the above mechanical joint include, for example, Japanese Patent Application Laid-Open No. 2006-225897 (Patent Document 1), Japanese Patent Application Laid-Open No. 2004-278257 (Patent Document 2), and the like. Note that Patent Document 2 discloses a technique for joining a PCa column and a PCa beam or PCa beams through a joint panel portion in which a joint for connecting beam main bars is embedded.

Prior Art Documents

Patent Documents

[0005] [Patent Document 1] Japanese Unexamined Patent Application Publication No. 2006-225897 [Patent Document 2] Japanese Unexamined Patent Application Publication No. 2004-278257 [Summary of the Invention] [Problems to be Solved by the Invention]

[0006] However, as described above, when the protruding length of the beam main reinforcement 131 protruding from the jointed beam member 103 is increased so that the mechanical joint 135 is located in a region outside the plastic hinge region, the width size W of the jointed beam member 103 is likely to exceed the size that can be transported on the road without permission under the Road Act. The dimensions of a vehicle that can be transported without permission to pass on the road are specified in Article 47, Paragraph 1 of the Road Act and Article 3 of the Vehicle Restriction Order as 12.0 m in length × 2.5 m in width × 3.8 m in height (4.1 m for height-designated roads).

[0007] In view of the above circumstances, an object of the present invention is to provide a frame structure using a PCa column-beam member and a construction method thereof that can reduce the width dimension of the jointed beam member by making the beam main reinforcement protruding from the beam member only on one side, and can be easily miniaturized to a size that cannot be transported on the road without permission under the Road Act. [Means for Solving the Problems]

[0008] In order to achieve the above object, the frame structure using the PCa column-beam member of the present invention includes two PCa columns, two PCa girders each placed on each of the two PCa columns and having a column-beam joint and a pair of girder-beams provided on both side surfaces in the girder direction of the column-beam joint, and an orthogonal beam including a PCa orthogonal beam spanned between the column-beam joints of each of the two PCa girders. The main reinforcement bars of the PCa orthogonal beam protrude from both end faces in the axial direction of the main reinforcement bars of the PCa orthogonal beam respectively. In the column-beam joint of at least one of the two PCa girders, reinforcing bars for joining with the main reinforcement bars of the PCa orthogonal beam are embedded so as to protrude from the side surface opposite to the side surface facing the PCa orthogonal beam. In the column-beam joint of the one PCa girder, a first holding portion that holds one end portion of the reinforcing bar for joining embedded therein closer to the PCa orthogonal beam and a second holding portion that can hold the tip end portion of the main reinforcement bar protruding from one end face closer to the column-beam joint of the PCa orthogonal beam are embedded, and the column-beam joint of the one PCa girder has a hole into which the main reinforcement bar protruding from the one end face closer to the column-beam joint of the PCa orthogonal beam can be inserted so that the tip end portion of the main reinforcement bar is held by the second holding portion of the mechanical joint.

[0009] Also, the construction method of the present invention includes inserting the main reinforcement bar protruding from one end face closer to the column-beam joint among the both end faces of the PCa orthogonal beam into the hole provided in the column-beam joint of the one PCa girder placed on the one PCa column, and holding the tip end portion of the main reinforcement bar by the second holding portion of the mechanical joint respectively to fix one end of the PCa orthogonal beam closer to the column-beam joint to the column-beam joint of the one PCa girder; placing the other PCa girder of the two PCa girders on the other PCa column of the two PCa columns; and placing cast-in-place concrete in the space between the other end face of the PCa orthogonal beam with one end fixed to the column-beam joint of the one PCa girder and the end face closer to the PCa orthogonal beam of the column-beam joint of the other PCa girder of the two PCa girders to construct the orthogonal beam spanned between the column-beam joints of each of the two PCa girders.

[0010] According to the present invention, by arranging a mechanical joint for joining the main reinforcement bars for beam in the column-beam joint of the PCa grid beam and the main reinforcement bars protruding from the end face of the PCa orthogonal beam within the column-beam joint, it is possible to form a structure in which the main reinforcement bars for beam protrude only on one side of the column-beam joint of the PCa grid beam. As a result, the width in the direction orthogonal to the span direction of the PCa grid beam can be suppressed to a dimension obtained by adding the width of the column-beam joint and the protruding length of the main reinforcement bars for beam protruding only to one side in the width direction from the column-beam joint, and the width of the PCa grid beam can be reduced to a size that can be transported on the road without permission under the Road Act.

Brief Description of the Drawings

[0011]

Figure 1

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Figure 11

Embodiments for Carrying Out the Invention

[0012] Hereinafter, embodiments of a frame structure using the PCa column-beam member of the present invention and its construction method will be described with reference to the drawings. FIG. 1 is a perspective view of a frame structure using the PCa column-beam member of the present embodiment, FIG. 2 is a perspective view of a PCa column in the frame structure of FIG. 1, FIG. 3 is a perspective view of a PCa girder beam in the same frame structure, and FIG. 4 is a perspective view of a PCa orthogonal beam in the same frame structure. Note that the "PCa column-beam member" is a general term for a PCa column, a PCa girder beam, and a PCa orthogonal beam. As shown in these figures, the frame structure using the PCa column-beam member of the present embodiment is composed of two PCa columns 1A, 1B, two PCa girder beams 3A, 3B, a PCa orthogonal beam 5, and an orthogonal beam 6 including in-situ concrete S. A building is constructed by adding this frame structure in the horizontal and vertical directions.

[0013] As shown in FIGS. 1 and 2, a plurality of column main reinforcements 11A, 11B protrude from the upper surfaces of the PCa columns 1A, 1B. As shown in FIGS. 1 and 3, the PCa girder beams 3A, 3B are also called "L-shaped members", and include column-beam joints 31A, 31B having a substantially cubic shape, and a pair of girder beam portions 32A, 32B provided on both sides in the girder direction of the column-beam joints 31A, 31B. From one side surface 34A, 34B facing in a direction orthogonal to the girder direction of the column-beam joints 31A, 31B, reinforcing bars 33A, 33B for beam main reinforcement joints having the same arrangement as the beam main reinforcements 51, 53 of the PCa orthogonal beam 5 protrude.

[0014] As shown in FIGS. 1 and 4, the PCa orthogonal beam 5 is a rectangular parallelepiped PCa member that is spanned across the column-beam joints 31A and 31B of two PCa girder beams 3A and 3B respectively placed on two PCa columns 1A and 1B, with the in-place concrete S sandwiched therebetween. From both end faces 55 and 57 of the PCa orthogonal beam 5, that is, both end faces facing in a direction orthogonal to the girder direction, the beam main reinforcements 51 and 53 of the PCa orthogonal beam 5 project respectively. Here, reference numeral 51 is the protruding portion of the beam main reinforcement from the end face 55 facing the side of the column-beam joint 31A of one PCa girder beam 3A, and reference numeral 53 is the protruding portion of the beam main reinforcement from the end face 57 facing the side of the column-beam joint 31B of the other PCa girder beam 3B.

[0015] FIG. 5 is a cross-sectional view showing the configuration of the column-beam joint 31A of the PCa girder beam 3A, and FIG. 6 is a longitudinal sectional view thereof. The configuration of the column-beam joint 31B of the PCa girder beam 3B is the same. In the column-beam joint 31A, a reinforcing bar 33A for beam main reinforcement joint, which has the same arrangement as the beam main reinforcements 51 and 53 of the PCa orthogonal beam 5, is fixed by protruding a part of its length from one end face 34A orthogonal to the girder direction. Further, in the column-beam joint 31A, a plurality of mechanical joints 35 for joining one-to-one the respective tip ends 331 of the plurality of reinforcing bars 33A for beam main reinforcement joint fixed thereto, closer to the PCa orthogonal beam 5, and the respective tip ends 511 of the plurality of beam main reinforcements 51 protruding from the end face 55 closer to the column-beam joint 31A of the PCa orthogonal beam 5 are embedded inside the column-beam joint 31A. The mechanical joint 35 has a first holding portion 351 in a state of holding the tip end 331 of the reinforcing bar 33A for beam main reinforcement joint, and a second holding portion 352 capable of holding the tip end 511 of the beam main reinforcement 51 protruding from the end face 55 of the PCa orthogonal beam 5. Furthermore, in the column-beam joint 31A, a plurality of reinforcing bar insertion holes 36 opening to the end face 37 facing the end face 55 of the PCa orthogonal beam 5 are provided to enable insertion of each beam main reinforcement 51 protruding from the end face 55 of the PCa orthogonal beam 5 until its tip end 511 is held by the second holding portion 352 of the mechanical joint 35.

[0016] Further, a plurality of column main reinforcement through holes 39A for inserting a plurality of column main reinforcements 11A, 11B protruding from the upper surfaces of the PCa columns 1A, 1B are provided at the column-beam joints 31A, 31B of the 3A and 3B PCa girders.

[0017] Next, a construction method of a framed structure using the PCa column-beam member of the present embodiment will be described.

[0018] As shown in FIG. 7, with a plurality of column main reinforcements 11A protruding from the upper surface of the PCa column 1A inserted into the plurality of column main reinforcement through holes 39A of the column-beam joint 31A of the PCa girder 3A on one of the two PCa columns 1A, 1B, the PCa girder 3A is placed in a direction in which the girder direction is aligned with the direction orthogonal to the straight line connecting the centers of the two PCa columns 1A, 1B.

[0019] Next, as shown in FIG. 8, each tip 511 of the plurality of beam main reinforcements 51 protruding from the end face 55 of the PCa orthogonal beam 5 is inserted into the second holding portion 352 of the plurality of mechanical joints 35 embedded in the column-beam joint 31A until they are held by the respective rebar insertion holes 36 of the column-beam joint 31A of the PCa girder 3A placed on the PCa column 1A. By doing so, the plurality of beam main reinforcement connecting rebars 33A and the plurality of beam main reinforcements 51 of the PCa orthogonal beam 5 are connected to each other through the plurality of mechanical joints 35, and the end face 55 of the PCa orthogonal beam 5 is fixed to the end face 37 of the column-beam joint 31A of the PCa girder 3A.

[0020] Next, as shown in FIG. 9, with a plurality of column main reinforcements 11B protruding from the upper surface of the PCa column 1B inserted into the plurality of column main reinforcement through holes 39B of the column-beam joint 31B of the PCa girder 3B on the other PCa column 1B, the PCa girder 3B is placed in a direction in which the girder direction is aligned with the direction orthogonal to the straight line connecting the centers of the two PCa columns 1A, 1B.

[0021] Thereafter, as shown in FIG. 10, a reinforcing bar 53 protruding from the other end face 57 of the PCa orthogonal beam 5 whose end face 55 is fixed to the column-beam joint 31A of the PCa girder beam 3A and a reinforcing bar 33B protruding from the end face 34B of the column-beam joint 31B of the PCa girder beam 3B facing the other end face 57 of the PCa orthogonal beam 5 are joined by a mechanical joint 38. A web bar (not shown) and a formwork are assembled between the other end face 57 of the PCa orthogonal beam 5 whose end face 55 is fixed to the column-beam joint 31A of the PCa girder beam 3A and the end face 34B of the column-beam joint 31B of the PCa girder beam 3B facing the other end face 57 of the PCa orthogonal beam 5, and the in-place concrete S is placed. As a result, the PCa orthogonal beam 5 is fixed between the column-beam joints 31A and 31B of the two PCa girder beams 3A and 3B, and the frame structure composed of the two PCa columns 1A and 1B, the two PCa girder beams 3A and 3B, and the PCa orthogonal beam 5 is completed.

[0022] As described above, according to the frame structure using the PCa column-beam members of the present embodiment, within the column-beam joint 31A of the PCa girder beam 3A, the tip portion 331 of the plurality of reinforcing bars 33A for joining the beam main reinforcements fixed to the column-beam joint 31A closer to the PCa orthogonal beam 5 and the tip portion 511 of the beam main reinforcement 51 protruding from the end face 55 of the PCa orthogonal beam 5 closer to the column-beam joint 31A are joined within the column-beam joint 31A by arranging the mechanical joint 35. Thus, a structure can be achieved in which the reinforcing bar 33A for joining the beam main reinforcements protrudes only from one side of the column-beam joint 31A of the PCa girder beam 3A. Thereby, the width in the direction orthogonal to the girder direction of the PCa girder beam 3A can be suppressed to a dimension obtained by adding the width of the column-beam joint 31A and the protruding length of the reinforcing bar 33A for joining the beam main reinforcements protruding only from one side in the width direction from the column-beam joint 31A, and it becomes easy to miniaturize the PCa girder beam 3A to a size that can be transported using the road without permission under the Road Act.

[0023] The above-described structural framework composed of two PCa columns 1A and 1B, two PCa girder beams 3A and 3B, and a PCa orthogonal beam 5 has been explained. For example, a similar mechanical joint is also embedded in the column-beam joint 31B of the PCa girder beam 3B. When fixing the end face of an additional PCa orthogonal beam (not shown) to the column-beam joint 31B of the PCa girder beam 3B, the fixed-side tip of the reinforcement bar 33B for connecting the main beam reinforcement bars fixed to the column-beam joint 31B of the PCa girder beam 3B and the main beam reinforcement bar protruding from the additional PCa orthogonal beam are joined by a mechanical joint embedded in the column-beam joint 31B of the PCa girder beam 3B, so that the width dimension of the PCa girder beam 3B can also be reduced.

Explanation of Reference Numerals

[0024] 1A, 1B PCa columns 3A, 3B PCa girder beams 5 PCa orthogonal beam 31A, 31B Column-beam joints 32A, 32B Girder beam parts 33A, 33B Reinforcement bars for connecting main beam reinforcement bars 35 Mechanical joint 351 First holding part 352 Second holding part 36 Reinforcement bar insertion hole 51, 53 Main beam reinforcement bars of the PCa orthogonal beam S Cast-in-place concrete

Claims

1. Two PCA columns, Two PCA girders placed on each of the two PCA columns, each having a column-beam joint and a pair of girder-beam parts provided on both sides in the girder direction of the column-beam joint, An orthogonal beam including a PCA orthogonal beam spanned between the column-beam joints of the two PCA girders, The main reinforcement bars of the PCA orthogonal beam protrude from both axial end faces of the main reinforcement bars of the PCA orthogonal beam respectively, At least one of the two PCA girders has a reinforcing bar for joining with the main reinforcement bar of the PCA orthogonal beam embedded so as to protrude from the side face opposite to the side face facing the PCA orthogonal beam at the column-beam joint, At the column-beam joint of the one PCA girder, a mechanical joint having a first holding part holding one end part of the embedded joining reinforcing bar closer to the PCA orthogonal beam and a second holding part capable of holding the tip part of the main reinforcement bar protruding from one end face of the PCA orthogonal beam closer to the column-beam joint is embedded, And the column-beam joint of the one PCA girder has a hole into which the main reinforcement bar protruding from one end face of the PCA orthogonal beam closer to the column-beam joint can be inserted so that the tip part of the main reinforcement bar is held by the second holding part of the mechanical joint A frame structure using a PCA column-beam member.

2. A frame structure using the PCA column-beam member according to Claim 1, At the column-beam joint of the other PCA girder of the two PCA girders, a reinforcing bar for joining with the main reinforcement bar of the PCA orthogonal beam is embedded so as to protrude from the side face facing the PCA orthogonal beam A frame structure using a PCA column-beam member.

3. Two PCA columns, Two PCA girders placed on each of the two PCA columns, each having a column-beam joint and a pair of girder-beam parts provided on both side faces in the girder direction of the column-beam joint, An orthogonal beam including a PCA orthogonal beam spanned between the column-beam joints of the two PCA girders, The main reinforcement bars of the PCA orthogonal beam protrude from both axial end faces of the main reinforcement bars of the PCA orthogonal beam respectively, At least one of the two PCA girders has a reinforcing bar for joining with the main reinforcement bar of the PCA orthogonal beam embedded so as to protrude from the side face opposite to the side face facing the PCA orthogonal beam at the column-beam joint, In the column-beam joint of the one PCa girder, a mechanical joint is embedded, which has a first holding part that holds one end of the reinforcing bar embedded therein closer to the PCa orthogonal beam, and a second holding part that can hold the tip of the main reinforcing bar protruding from one end face of the PCa orthogonal beam closer to the column-beam joint. And the column-beam joint of the one PCa girder has a hole into which the main reinforcing bar protruding from one end face of the PCa orthogonal beam closer to the column-beam joint can be inserted so that the tip of the main reinforcing bar is held by the second holding part of the mechanical joint. A construction method of a frame structure using PCa column-beam members. A step of placing one of the two PCa girders on one of the two PCa columns. Insert the main reinforcing bar protruding from one end face of the two end faces of the PCa orthogonal beam closer to the column-beam joint into the hole provided in the column-beam joint of the one PCa girder placed on the one PCa column, and hold the tip of the main reinforcing bar by the second holding part of the mechanical joint respectively, to fix one end of the PCa orthogonal beam closer to the column-beam joint to the column-beam joint of the one PCa girder. A step of placing the other PCa girder of the two PCa girders on the other PCa column of the two PCa columns. A step of placing cast-in-place concrete in the space between the other end face of the PCa orthogonal beam with one end fixed to the column-beam joint of the one PCa girder and the end face of the column-beam joint of the other PCa girder of the two PCa girders closer to the PCa orthogonal beam, to construct the orthogonal beam spanned between the column-beam joints of the two PCa girders respectively. A construction method of a frame structure using PCa column-beam members having the above steps.

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