JP2020148041A - Construction method of column-beam frame, precast concrete member and column-beam frame - Google Patents

Abstract

To provide a construction method of column-beam frame, precast concrete member and column-beam frame, which can be effectively constructed by using precast concrete members.SOLUTION: A column-beam frame 12 of building 10 is configured by using a plurality of precast concrete (PC) members 20, 30, 40 provided with junctions that can be jointed to a vertical direction. PC members 20 are configured by integrally molding the beam parts 23 and a first column part 21 and a second column part 22 each connected to the end parts of the beam parts 23. The second column part 22 of the PC member 20 is directly jointed as the second PC column beam member on the first column part 21 of the PC member 20 as the first PC column beam member, and the first column part 21 of the PC member 20 is directly jointed as the third PC column beam member on the second column part 22 of the PC member 20 as the first PC column beam member. In addition, a beam part 23 of two PC members 20 directly and indirectly jointed in the vertical direction is located to different height positions.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method for constructing a column-beam frame, a precast concrete member, and a column-beam frame.

Conventionally, a frame is constructed with precast concrete members. In this case, there are a method of manufacturing a column member and a beam member individually and integrating them at a joint, a method of manufacturing a column including a joint and inserting a large column from the left and right (for example, Non-Patent Document 1). And Patent Document 1).

The frame described in Non-Patent Document 1 includes a precast concrete member (LR beam) having a joint portion and a beam portion having a through hole formed at a column main bar position, and a mortar-filled mechanical joint for the main bar at the stigma (LR beam). After that, it is constructed by incorporating a sleeve joint) and using a precast concrete column in which the column main bar protrudes downward. The beam is joined by inserting (horizontally inserting) the beam main bar protruding from the other end into the sleeve joint built in one end of the LR beam by horizontal movement.

In the joining structure described in Patent Document 1, a beam reinforcing bar is projected laterally from the precast beam-column joint, and a sleeve into which the beam reinforcing bar is inserted and fixedly joined is embedded in one end in the longitudinal direction of the precast beam member. To do.

JP-A-2009-121083

Kensuke Kano, Naoto Fujio, Yasuhiko Masuda, Ikuo Ishikawa "Construction of high-rise apartment building aiming for all precast-LRV construction method implementation example", [online], [Search on February 25, 2019], Internet <URL: https //www.jstage.jst.go.jp/article/coj1975/44/8/44_48/_pdf/-char/ja>

Conventionally, as described in Non-Patent Document 1 and Patent Document 1 described above, when a frame including a beam is composed of a precast concrete member, the beam is arranged by lateral insertion. Therefore, in order to construct the beams on the same floor, it is necessary to arrange the beams in order, the construction procedure is complicated, and it is difficult to shorten the construction period.

The method for constructing a beam-beam structure that solves the above problems is a method for constructing a beam-column structure that is composed of a plurality of precast concrete (PC) members, and the plurality of PC members include the first and second. And a third PC beam member, the first, second and third PC beam members include a beam portion and a first pillar portion and a second pillar portion connected to an end portion of the beam portion, respectively. The first pillar portion and the second pillar portion are provided with a joint portion that can be joined in the vertical direction, and the first pillar of the first PC beam member is formed by integrally forming the portion. The second pillar portion of the second PC beam member is directly or indirectly joined on the portion, and the second pillar portion of the first PC beam member is placed on the second pillar portion. By directly or indirectly joining the first pillars of the PC beam member of 3, the beam structure is constructed, and the two PC beam members that are directly or indirectly joined in the vertical direction. The beam portions are arranged at different height positions.
Further, the precast concrete member for solving the above problems is configured by integrally forming a beam portion and a first pillar portion and a second pillar portion to which the end portions of the beam portions are connected, respectively, and the first pillar portion and the first pillar portion and the second pillar portion are formed. The second pillar portion is provided with a joint portion for joining only in the vertical direction.

According to the present invention, a column-beam frame can be efficiently constructed by using a precast concrete member.

The schematic perspective view explaining the outline of the building in 1st Embodiment. It is a perspective view of the precast concrete member used in the 1st Embodiment, (a) is a substantially H type precast concrete member, (b) is a substantially I type precast concrete member, and (c) is a precast concrete provided at the top. Element. It is explanatory drawing of the construction method of the column beam frame in 1st Embodiment, (a) is the case of stacking 2nd floor, (b) is the case of stacking 3rd floor, (c) is the case of stacking top floor. Is shown. The front view of the main part explaining the column beam frame in 2nd Embodiment. It is explanatory drawing explaining the column beam frame in the modified example, (a) is the exploded perspective view of the main part which arranged the substantially H-shaped precast concrete member two-dimensionally, and (b) is the substantially H-shaped precast concrete. Front view of the main part where the members are placed on top of each other without shifting. It is explanatory drawing explaining the precast concrete member in the modified example, (a) is the perspective view of the precast concrete member having two first pillar part and two beam part, (b) is arranged (a). The front view of the main part of the column-beam frame, (c) is the front view of the main part of the column-beam frame using differently shaped precast concrete members. It is explanatory drawing explaining the precast concrete member in the modified example, (a) is the precast concrete member separated in the beam part, (b) is the precast concrete member which separated the precast concrete member provided with two beam parts.

(First Embodiment)
Hereinafter, with reference to FIGS. 1 to 3, a method for constructing a column-beam frame, a precast concrete member, and a first embodiment in which the column-beam frame is embodied will be described.

FIG. 1 shows a building 10 including a column-beam frame 12 constructed by the method for constructing a column-beam frame of the present embodiment. This building 10 is a seismic isolation building provided with a seismic isolation device (not shown).
The building 10 includes a foundation 11 provided on the seismic isolation device, a column-beam frame 12 provided on the foundation 11, a wooden floor 13, and a shear wall 15. Unlike the beams of the conventional building, the beams of the building 10 are not continuous in a straight line, and the beams are arranged at different height positions between the columns of the adjacent precast concrete members. Therefore, the burden of the horizontal force on the pillars of the building 10 increases as compared with the conventional building. Therefore, in this building 10, a seismic isolation device is provided, the span (distance between columns) is shortened, and the earthquake-resistant wall 15 is arranged. Specifically, the weight of each floor based on the floor and the like of the building 10 is calculated, and the horizontal force applied to the building 10 is calculated based on this weight. The shearing force and bending moment applied to the column or beam are calculated from this horizontal force, and the size of the column or beam, the amount of reinforcing bars, the span, the characteristics of the shear wall 15 and the like are determined according to the shearing force and the bending moment.

The column-beam frame 12 of the building 10 includes three types of precast concrete members (hereinafter referred to as PC members). In the column-beam frame 12 of the present embodiment, a substantially H-shaped PC member 20, a substantially I-shaped PC member 30, and a substantially reverse groove type PC member 40 are laminated to form a column and a girder. In the column-beam frame 12, the PC members 20 are laminated while alternately shifting the height positions of the beam portions 23, the PC member 30 is arranged at the side end portion where the PC member 20 is not arranged, and the PC member 40 is placed at the upper end portion. Deploy. Here, the PC members 20 and 40 function as PC beam members including the beam portions 23 and 43.

As shown in FIG. 2A, the PC member 20 includes a first pillar portion 21, a second pillar portion 22, and a beam portion 23 having a square pillar shape (rectangular parallelepiped shape), respectively. In the present embodiment, the first pillar portion 21 and the second pillar portion 22 have the same shape and have the same vertical length L1 (height) as the height of the first floor of the building 10. Both ends of the beam portion 23 are connected to the central portions of the first pillar portion 21 and the second pillar portion 22, respectively. The first column portion 21, the second column portion 22, and the beam portion 23 are integrally formed of concrete containing reinforcing bars for bearing the load of the building. In this case, in the first column portion 21 and the second column portion 22, the amount of reinforcing bars is large at the joint portion to which the beam portion 23 is connected, and the amount of reinforcing bars is small at the upper end portion and the lower end portion. In the present embodiment, the length from the upper surface of the first pillar portion 21 (second pillar portion 22) to the central axis of the beam portion 23 is from the lower surface of the first pillar portion 21 (second pillar portion 22) to the beam portion 23. It is the same as the length to the central axis of, and is half the height of one floor (L1 / 2).

In the first column portion 21 and the second column portion 22 of the present embodiment, the outer surface is flat without forming a joint portion for joining with other beams except for the portion (side surface) to which the beam portion 23 is connected. Consists of faces. Specifically, the beam main bars for joining with other beams are not projected on the outer surfaces of the first column portion 21 and the second column portion 22, and the sleeve joint is not embedded in the outer surfaces.

Further, a plurality of column main bars 21a (22a) are projected from the lower surface of the first column portion 21 (second column portion 22). Further, a plurality of holes having an open upper surface are provided in the upper portion of the first pillar portion 21 (second pillar portion 22), and the sleeve joint 21b (22b) is embedded. The sleeve joint 21b (22b) is used to join the column main bar of the PC member arranged above.

As shown in FIG. 2B, the PC member 30 is a column member constituting the column of the column-beam frame 12, and has the same size as the first column portion 21 (second column portion 22) of the PC member 20. It is a rectangular parallelepiped pillar member. The PC member 30 is made of concrete containing reinforcing bars for bearing the load applied to the columns of the building 10. Further, a plurality of column main bars 30a are projected from the lower surface of the PC member 30, a plurality of holes having an open upper surface are provided in the upper portion of the PC member 30, and a sleeve joint 30b is embedded.

As shown in FIG. 2C, the PC member 40 includes a first pillar portion 41, a second pillar portion 42, and a beam portion 43. The beam portion 43 of the PC member 40 has the same size and shape as the beam portion 23 of the PC member 20. Further, the first pillar portion 41 and the second pillar portion 42 of the PC member 40 have the same cross-sectional shape as the first pillar portion 21 and the second pillar portion 22 of the PC member 20, and the PC member 20 has the same cross-sectional shape as the beam portion 23. It has a length to the lower surface of each pillar portion (21, 22). Both ends of the beam portion 43 of the PC member 40 are fixed to the upper ends of the first pillar portion 41 and the second pillar portion 42, and the upper surfaces of the first pillar portion 41, the second pillar portion 42, and the beam portion 43 are flush with each other. It is composed of. The first column portion 41, the second column portion 42, and the beam portion 43 are made of concrete containing reinforcing bars for bearing the load of the building 10, respectively. Further, a plurality of column main bars 41a (42a) are projected from the lower surface of the first column portion 41 (second column portion 42). Since the PC member 40 is a member used in the uppermost layer, no joint with the column main bar is provided at the upper part of the first column portion 41, the second column portion 42, and the beam portion 43. In this embodiment, the column main bars 21a, 22a, 30a, 41a, 42a and the sleeve joints 21b, 22b, 30b function as joints that can be joined only in the vertical direction.

Next, a method of constructing the column-beam frame 12 of the building 10 will be described with reference to FIG. 3 using the PC members 20, 30, and 40 described above.
As shown in FIG. 3A, the PC member 30 and the PC member 20 are joined onto the foundation 11. Specifically, the foundation 11 is provided with a plurality of sleeve joints (not shown) at positions where columns are erected. The column main bar of the PC member 20 and the column main bar of the PC member 30 are inserted into these sleeve joints, and the grout material is injected. As a result, the plurality of PC members 20 and the PC members 30 are fixed (joined) to the foundation 11. In this case, the upper portions of the sleeve joints 21b, 22b, and 30b are opened on the upper surface of the first pillar portion 21 of the PC member 20, the upper surface of the second pillar portion 22, and the upper surface of the PC member 30.

Then, for example, a small beam (not shown) made of wood or the like is passed and fixed on the beam portion 23 of the PC member 20, and the wooden floor 13 is constructed on the small beam. As a result, the floor on the first floor is constructed.

Next, another PC member 20 is joined onto the PC member 20 having the beam portion 23 constituting the first floor. Specifically, the second pillar of each PC member 20 (second PC pillar / beam member) is placed on the first pillar portion 21 of the PC member 20 (first PC pillar / beam member) erected on the foundation 11. The unit 22 is arranged. Further, each of the upper PC member 20 (third PC column / beam member) is placed on the second column portion 22 of the upper or lower PC member 20 (first PC column / beam member) of the PC member 30. The first pillar portion 21 is arranged. Then, the pillar main bars 21a, 22a of the upper PC member 20 are inserted into the openings of the sleeve joints 21b, 22b, 30b of the lower PC member 20 and the PC member 30, and the grout material is injected. In this case, the beam portion 23 of the upper PC member 20 is arranged above the portion where the beam portion 23 of the lower PC member 20 is not arranged, and the beam portion 23 above the beam portion 23 of the lower PC member 20. There is no part. Further, the joint position between the first pillar portion 21 and the second pillar portion 22 and the joint position between the PC member 30 and the first pillar portion 21 of the upper PC member 20 are the intermediate portions (adjacent to the beam) for the first floor. It will be located in the center of the height to the beam).
At this time, a trabecula (not shown) is provided on the beam portion 23 of the PC member 20 located at the uppermost portion, and a wooden floor 13 is formed on the beam to form a floor on the second floor.

Next, as shown in FIG. 3 (b), the PC member 20 (on the first pillar portion 21 of the PC member 20 (first PC pillar beam member) having the beam portion 23 constituting the second floor) The second column portion 22 or the PC member 30 of the second PC column beam member) is joined. Further, the first pillar portion 21 of the upper PC member 20 (third PC pillar / beam member) is joined onto the second pillar portion 22 of the lower PC member 20 (first PC pillar / beam member). .. Then, a beam (not shown) and a wooden floor 13 are formed to form a floor on the third floor.
As described above, the substantially H-shaped PC members 20 are stacked in the upper and lower layers while being displaced in the horizontal direction.

Then, as shown in FIG. 3C, on the uppermost floor, the PC member 40 is joined onto the lower PC member 20 and the PC member 30. Specifically, the first pillar portion 41 of the PC member 40 is joined on the second pillar portion 22 of the PC member 20 or on the PC member 30, and on the first pillar portion 21 of the PC member 20. The second pillar portion 42 of the PC member 40 is joined. Then, a trabecula (not shown) is provided on the beam portion 43 of the PC member 40, and a wooden floor 13 is formed on the trabecula to form a ceiling on the uppermost floor.

As described above, the pillar-beam frame 12 and the wooden floor 13 of the building 10 are constructed. In this case, the pillars of the building 10 are composed of the pillars (21, 22, 41, 42) of the laminated PC members 20 and 40 and the PC member 30, and the beams 23 and 43 of the PC members 20 and 40 form the building. Ten girders are constructed.
After that, the earthquake-resistant wall 15 is provided in the space surrounded by the beam portion 23 of the PC member 20 at the top and bottom.

According to this embodiment, the following effects can be obtained.
(1-1) In the present embodiment, the column-beam frame 12 is configured by using the PC members 20, 30, and 40 having joints provided only in the vertical direction. As a result, the column-beam frame 12 is formed by joining only in the vertical direction, so that joining in the horizontal direction is unnecessary. Therefore, a plurality of beam-column frames 12 on the same floor can be joined at the same time. As a result, the construction period can be shortened.

(1-2) In the present embodiment, the beam portion 23 (43) is integrally formed with the PC member 20 (40). As a result, it is not necessary to join the beams at the site, so that the temporary installation used for joining the beams can be eliminated.

(1-3) In the present embodiment, the length between the upper surface (or lower surface) of the first pillar portion 21 (second pillar portion 22) of the PC member 20 and the central axis of the beam portion 23 is set to the first floor of the building 10. Half the height of the minute. As a result, the PC members 20 can be joined to each other at a portion of the column where the stress is small and the amount of reinforcing bars is small. Therefore, when constructing the column-beam frame 12, the number of reinforcing bars to be joined at the site can be reduced.

(1-4) In the present embodiment, the second pillar of another PC member 20 (second PC pillar / beam member) is placed on the first pillar portion 21 of the PC member 20 (first PC pillar / beam member). The portions 22 are joined, and the first column portion 21 of the other PC member 20 (third PC column / beam member) is joined onto the second column portion 22 of the PC member 20 (first PC column / beam member). To do. As a result, the beam portions 23 can be regularly arranged so that the positions of the beam portions 23 are alternately displaced from the PC members 20 stacked vertically.

(Second Embodiment)
Next, with reference to FIG. 4, a method of constructing the column-beam frame, a PC member, and a second embodiment in which the column-beam frame is embodied will be described. In the first embodiment, the substantially H-shaped PC member 20 includes a first pillar portion 21 and a second pillar portion 22 having a length in the vertical direction equal to the height of one floor. The substantially H-shaped PC member in the present embodiment has a first pillar portion and a second pillar portion shorter than those in the first embodiment, and is joined via a substantially I-shaped PC member. Hereinafter, the same parts as those in the above embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 4, in the present embodiment, a substantially H-shaped PC member 50, substantially I-shaped PC members 35 and 36 having different lengths, and a PC member 40 are combined and configured.
Like the PC member 20, the PC member 50 includes a first pillar portion 51, a second pillar portion 52, and a beam portion 53 having a square pillar shape (rectangular parallelepiped shape), respectively. The first pillar portion 51 and the second pillar portion 52 have the same shape and have a length L2 (height) having a width (for example, 2.5 m or less) that allows a general vehicle such as a truck to be transported on a general road. Both ends of the beam portion 53 are connected to the central portions of the first pillar portion 51 and the second pillar portion 52, respectively. The first column portion 51, the second column portion 52, and the beam portion 53 are integrally formed of concrete containing reinforcing bars for bearing the load of the building.

In the first column portion 51 and the second column portion 52 of the present embodiment, a joint portion for joining with another beam is not formed except for the portion to which the beam portion 53 is connected, and these outer surfaces are flat surfaces. Consists of. Specifically, the beam main bars for joining with other beams are not projected on the outer surfaces of the first column portion 51 and the second column portion 52, and the sleeve joint is not embedded in the outer surfaces.

Further, a plurality of column main bars are projected from the lower surface of the first column portion 51 (second column portion 52), and the upper surface is opened above the first column portion 51 (second column portion 52). A hole is provided and a sleeve joint is embedded. This sleeve joint is used to join the column main bar of the PC member arranged above.

Further, the substantially I-shaped PC members 35 and 36 are column members constituting the columns of the column-beam frame, like the PC members 30, and are made of rectangular parallelepiped concrete having reinforcing bars. The PC member 35 is arranged at the side end of the building. The PC members 35 and 36 are arranged between the PC members 50 joined in the vertical direction. The lengths of the PC members 35 and 36 from the beam portion 53 of the PC member 50 joined directly below to the beam portion 53 of the PC member 50 joined directly above are the second floor and the first floor of the building, respectively. Has a length. Then, a plurality of column main bars are projected from the lower surface of the PC member 35 (36), and a plurality of holes having an open upper surface are provided on the upper portion of the PC member 35 (36), and a sleeve joint is embedded.

In the present embodiment, substantially I-shaped PC members 35 and 36 are joined onto the foundation 11 constituting the first floor. Next, the first pillar portion 51 or the second pillar portion 52 of the PC member 50 is joined onto each PC member 36. In this case, as in the above embodiment, a small beam or a wooden floor is arranged on the beam portion 53 of the PC member 50 to form the second floor.

Then, on the first column portion 51 of the PC member 50 (first PC column / beam member), the second column portion 52 of another PC member (second PC column / beam member) is placed via the PC member 36. Is joined, and the first of the other PC members 50 (third PC columns and beams) is placed on the second column 52 of the PC member 50 (first PC column and beam members) via the PC member 36. The column portion 51 is joined. Further, the first pillar portion 51 of the PC member 50 is joined onto the PC member 35 arranged at the side end portion. Then, a small beam and a wooden floor are arranged on the beam portion 53 of the PC member 50 to form the third floor.

After that, the other PC members 50 (second and third PC beam members) are repeatedly laminated on the PC member 50 (first PC beam member) via the PC members 35 and 36. Then, the PC member 40 is joined to the uppermost floor in the same manner as in the first embodiment to construct a building including the column-beam frame.

According to this embodiment, in addition to the same effects as the above (1-1), (1-2), (1-4) and (1-5), the following effects can be obtained.
(2-1) In the present embodiment, the first pillar portion 51 and the second pillar portion 52 of the PC member 50 are configured to have a length L2 corresponding to a width that can be transported on a general road by a general vehicle. As a result, when the axial length of the beam portion 53 in the substantially H-shaped PC member 50 is long, the axial direction of the beam portion 53 can be extended in the traveling direction of the vehicle to convey the PC member 50. it can.

This embodiment can be modified and implemented as follows. The present embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.
-In each of the above embodiments, the substantially H-shaped PC members 20 and 50 and the substantially reverse groove type PC members 40 are arranged so that the beams are linearly arranged in a horizontal plane to form a vertical plane (outer circumference of the building 10). Join. Not limited to this, the beam may be arranged two-dimensionally (X direction and Y direction) in the horizontal plane.

For example, as shown in FIG. 5A, the beam portion 23 of the substantially H-shaped PC member 20 is arranged so as to extend in the Y direction, and then the PC member 20 is joined onto the PC member 20. The beam portion 23 may be arranged so as to extend in the X direction. In this case, the lengths of the first pillar portion 21 and the second pillar portion 22 may be set so that the beam portions 23 arranged in different horizontal directions are arranged in the center (middle) of the height of the first floor. However, the lengths of the first pillar portion 21 and the second pillar portion 22 may be set so that the beam portion 23 is located at the height of the first floor.

-In each of the above embodiments, substantially H-shaped PC members 20 and 50 are arranged alternately. The PC members 20 and 50 are not limited to the case where they are arranged alternately.
For example, as shown in FIG. 5B, the first pillar portions 21 and the second pillar portions 22 of the upper and lower PC members 20 may be joined to each other in a part. In this case, the design of the pillar can be changed in various ways.

-In each of the above embodiments, the PC members 20, 40, 50 include one beam portion 23, 43, 53, one first pillar portion 21, 41, 51, and one second pillar portion 22, 42, 52, respectively. .. The number of the first pillar portion, the second pillar portion, and the beam portion included in the PC member is not limited. For example, as shown in FIG. 6A, two first pillar portions 21, one second pillar portion 22, and two ends connected to the first pillar portion 21 and the second pillar portion 22. The frame may be constructed by using the PC member 60 provided with the beam portion 23.

In this case, as shown in FIG. 6B, when a plurality of PC members 60 are stacked vertically, the second pillar portion 22 is joined onto the first pillar portion 21 via the PC member 36. The first pillar portion 21 is joined onto the second pillar portion 22 via the PC member 36.

Further, as shown in FIG. 6C, the frame may be configured by using the PC member 60 and the substantially H-shaped PC member 50.
Further, the two beam portions 23 of the PC member 60 may be formed in a straight line as shown in FIG. 6A, or may be arranged with a step.

Further, a substantially # type PC member may be provided on the first pillar portion and the second pillar portion by separating the two beam portions. Further, the PC member may be a PC member in which the first pillar portion and the second pillar portion have only a joint portion. Even in this case, the column-beam frame can be efficiently constructed without the need for lateral insertion.

-In the second embodiment, the PC member 50 includes a first pillar portion 51 and a second pillar portion 52 having a width L2 capable of traveling on a general road. Not limited to this, the PC member may be divided into each width (length) capable of traveling on a general road in the longitudinal direction of the beam.

For example, as shown in FIG. 7A, the PC member 20 may be composed of PC members 71 and 72 whose beam portion 23 can be separated at the central portion. In this case, a joint portion for joining each is provided at the separated (divided) portion.
Specifically, the PC member 71 includes a first pillar portion 21 and a first beam portion 23a connected to the first pillar portion 21. A sleeve joint 23s is embedded in the first beam portion 23a on the side opposite to the first pillar portion 21. Specifically, a plurality of opened holes are provided in the portion (the other end surface) of the first beam portion 23a that connects to the first pillar portion 21 (one end surface), and the sleeve joint 23s is embedded. Let me. The PC member 72 includes a second pillar portion 22 and a second beam portion 23b connected to the second pillar portion 22. A plurality of beam main bars 23r are projected from the second beam portion 23b on the opposite side of the second column portion 22.

Then, before constructing the column-beam frame 12, the first beam portion 23a of the PC member 71 and the second beam portion 23b of the PC member 72 are joined on the ground at the site. Specifically, the beam main bar 23r of the second beam portion 23b is inserted into the hollow portion of the sleeve joint 23s of the first beam portion 23a, and grout is injected. As a result, the PC members 20 are formed by the PC members 71 and 72. After that, the column-beam frame 12 is constructed using the PC member 20.

When the beam portion 23 is long, the PC member 71, the PC member 72, and the third beam portion that joins the first beam portion 23a of the PC member 71 and the second beam portion 23b of the PC member 72. It may be divided into the PC member which becomes.
Further, as shown in FIG. 7B, the PC member 80 having a plurality of (two in this case) beam portions 23 is composed of PC members 81 and 82 that can be divided (separable) in the beam portions 23. You may.

-In each of the above embodiments, reinforcing bars (21a, 22a, 41a, 42a) are projected from the lower surface of each column portion (21, 22, 41, 42, 51, 52), and sleeve joints (21b, 22b) are formed on the upper portion. Was provided. The configuration of the joint portion of each column portion is not limited to this. For example, the column main bar may be projected upward from the upper surface of each column portion, and a sleeve joint may be provided at the lower portion.

-In the PC members 20, 40, 50 of each of the above embodiments, the first pillar portions 21, 41, 51 and the second pillar portions 22, 42, 52 have the same shape. The first pillar and the second pillar are not limited to the same shape, and if the pillars are arranged at both ends of the beam and can be stacked vertically, the first pillar and the second pillar can be stacked. , The length (height) and the shape may be different, and the size and shape of the cross section may be different. For example, the first pillar portion and the second pillar portion are not limited to a square cross section, and may be a pillar portion having a polygonal cross section such as a round cross section or a hexagonal cross section.

Next, the technical ideas that can be grasped from the above-described embodiment and other examples will be added below together with their effects.
(A) The method for constructing a column-beam frame according to claim 1, wherein the upper surface and the lower surface of the first column portion and the upper surface and the lower surface of the second column portion are joined between the upper and lower beams of the building. ..
Therefore, according to the invention described in (a), since the PC members can be joined at the portion of the column where the stress is small and the amount of reinforcing bars is small, the number of reinforcing bars to be joined at the site can be reduced. ..
(B) The first pillar portion and the second pillar portion have a length corresponding to a width that can be transported on a general road in a general vehicle, and are on the first pillar portion of the PC beam member and on the first pillar portion. The method for constructing a column-beam structure according to claim 1, wherein another PC column-beam member is joined onto the second column portion via a column member.
Therefore, according to the invention described in (b), when the axial length of the beam portion of the PC member is long, the axial direction of the beam portion extends in the traveling direction of the vehicle to convey the PC member. can do.

L1, L2 ... Length, 10 ... Building, 11 ... Foundation, 12 ... Pillar and beam structure, 13 ... Wooden floor, 15 ... Seismic wall, 20, 30, 35, 36, 40, 50, 60, 71, 72, 80 , 81, 82 ... PC members 21, 41, 51 ... 1st pillar, 22, 42, 52 ... 2nd pillar, 21a, 22a, 30a, 41a, 42a, ... Pillar main bar, 21b, 22b, 23s, 30b ... Sleeve joint, 23,43,53 ... Beam part, 23a ... First beam part, 23b ... Second beam part, 23r ... Beam main bar.

Claims (3)

It is a method of constructing a column-beam frame composed of a plurality of precast concrete (PC) members.
The plurality of PC members include first, second, and third PC beam members.
The first, second, and third PC column beam members are configured by integrally forming a beam portion and a first column portion and a second column portion connected to an end portion of the beam portion, respectively.
The first pillar portion and the second pillar portion are provided with joint portions that can be joined in the vertical direction.
The second column portion of the second PC column beam member is directly or indirectly joined on the first column portion of the first PC column beam member, and the first PC column beam member is joined. The column-beam structure is constructed by directly or indirectly joining the first column portion of the third PC column-beam member on the second column portion of the above.
A method for constructing a column-beam frame, characterized in that the beam portions of two PC column-beam members that are directly or indirectly joined in the vertical direction are arranged at different height positions. The beam portion and the first pillar portion and the second pillar portion to which the end portions of the beam portions are connected are integrally formed.
A precast concrete member characterized in that the first pillar portion and the second pillar portion are provided with joint portions that are joined only in the vertical direction. A column-beam frame constructed using multiple precast concrete (PC) members.
The plurality of PC members include first, second, and third PC beam members.
The first, second, and third PC column beam members are configured by integrally forming a beam portion and a first column portion and a second column portion connected to an end portion of the beam portion, respectively.
The first pillar portion and the second pillar portion are provided with joint portions that can be joined in the vertical direction.
The second column portion of the second PC column beam member is directly or indirectly joined on the first column portion of the first PC column beam member, and the first PC column beam member is joined. The first column portion of the third PC column beam member is directly or indirectly joined on the second column portion of the above.
A column-beam frame characterized in that the beam portions of two PC column-beam members that are directly or indirectly joined in the vertical direction are arranged at different height positions.