JP7018712B2 - Column-beam frame using hollow precast concrete columns - Google Patents

Description

The present invention relates to a column-beam frame using hollow precast concrete columns.

As is well known, as columns and beams of a building structure, for example, a structure in which columns are made of reinforced concrete and beams are made of steel or reinforced concrete is widely used.

When using the above structure, it takes a lot of man-hours and labor to construct a reinforced concrete column (hereinafter referred to as RC column), and the construction period becomes long. Therefore, when trying to reduce the construction period, The construction of RC columns becomes a bottleneck. However, if the PCa ratio of RC columns is increased in an attempt to realize the entire or many parts of RC columns with precast concrete (hereinafter referred to as PCa) in order to shorten the construction period, the weight of the RC columns will increase. Large lifting machines and transport machines are required for delivery and installation at the site, which increases construction costs. Therefore, there is a need for a construction method that can reduce the PCa ratio of RC columns to reduce the weight of RC columns, and at the same time, can be realized in the same construction period as when the entire RC columns are PCa.

As one of such construction methods, a construction method using a hollow RC column, that is, a hollow RC column whose PCa rate is reduced and reduced in weight by forming an internal space in which the upper end is open. Is being done. The use of hollow RC columns eliminates the need for large lifting machines and transport machines as the weight is reduced. Since lifting machines with long booms can be used, the space where pillars can be installed with a single lifting machine increases. Since the installation is easy, the construction speed can be improved, and the construction cost can be reduced. Patent Document 1 discloses such a PCa pillar.

Generally, after the hollow RC columns are erected, concrete is placed in the internal space of the columns in order to realize a strong structural frame, but the purpose is to reduce the weight of the building structure and the construction cost. As a result, a building structure may be constructed in which concrete is not placed inside the hollow RC pillar and the pillar is left hollow. However, in order to realize a building structure with hollow RC columns, it is difficult to join a beam to the side surface of the hollow RC column. On the other hand, Patent Document 2 discloses the following hollow precast columns.

FIG. 9 shows a hollow precast column disclosed in Patent Document 2. The hollow precast column is formed by joining the hollow precast column members 101 and 102 together in the axial direction. A beam-column joining member 103 for joining the beam 120 is interposed between the upper and lower precast column members 101 and 102. PC steel materials 104 ..., 105 ... Are inserted into the hollow portions 101a, 102a of the precast column members 101, 102, and the PC steel materials 104 ..., 105 ... Precast the precast column members 101, 102 via the beam-column joining member 103. Stress is applied. As a result, the lower end surface 102b of the upper precast column member 102 is crimped to the upper surface 103a of the beam-column joining member 103, and the upper end surface 101c of the lower precast column member 101 is crimped to the lower surface 103b of the beam-column joining member 103. Has been done.

Japanese Unexamined Patent Publication No. 2001-115418 Japanese Unexamined Patent Publication No. 2007-22451

As described above, in the structure described in Patent Document 2, the column-beam joining member 103 to which the beam 120 is joined and the upper and lower precast column members 101, 102 are prestressed by the PC steel materials 104 ..., 105 ... As a result, the joint strength between the beam-column joint member 103 and the precast column members 101 and 102 is increased. Further, at the portion where the upper end surface 101c and the lower end surface 102b of the precast column members 101 and 102 and the lower surface 103b and the upper surface 103a of the column-beam joining member 103 are in contact with each other, the column-beam joining member 103 is about the beam formation of the beam 120. The precast column members 101 and 102 have a structure close to that in direct contact with the beam 120. In such a structure, when a force acts in the horizontal direction during an earthquake, stress transmission between the precast column members 101 and 102 and the beam 120 is not sufficiently and surely performed, and there is a risk that the building structure will be damaged. There is sex.

Further, in the structure described in Patent Document 2, prestress is applied by the PC steel materials 104 ..., 105 ..., but the beam-column joining member 103 and the precast column members 101, 102 are joined while applying prestress at the site. It is not easy to do, that is, it is difficult to construct.

The problem to be solved by the present invention is to provide a column-beam structure using a hollow precast concrete column, which enables reliable stress transmission between a beam and a hollow reinforced concrete column and is easy to construct, and the column-beam structure. It is to provide building structures.

The present invention employs the following means in order to solve the above problems. That is, in the beam-column structure using the hollow precast concrete column according to the present invention, the reinforced concrete column and the H-shaped steel beam are joined by a beam-column joining member provided at the column head of the column, and the column is vertically connected. It is a hollow precast concrete pillar that extends in the direction and has an internal space where the upper end and the lower end are open. It is provided with a joint portion for beam joining , which is embedded in the main body and surrounds the main bar, and each of the hoop bars is a cross section of the main body. Of the plurality of main bars located at the four corners, the main bars are arranged in parallel with each side of the main body so as to surround the two main bars, and the main body has a predetermined value below the lower surface of the joint portion. A lower concrete portion having the above thickness is provided, and the lower surface of the lower concrete portion is connected to the pillar.
According to such a configuration, the main body of the column-beam joining member horizontally penetrates the main body, and the joint portion to which the beam is connected and the lower portion having a thickness equal to or more than a predetermined value below the lower surface of the joint portion. It has a concrete part, and the lower surface of the lower concrete part is connected to the pillar. That is, concrete having a thickness equal to or higher than a predetermined value obtained by the bearing stress is interposed between the upper surface of the column and the lower surface of the joint portion. Therefore, the stress transmission between the beam-column joint member and the hollow RC column located under the beam-column joint member extends from the lower surface of the joint portion penetrating the main body to the lower concrete portion, and from the lower concrete portion to the hollow RC portion. It is sufficiently and surely carried out to the columns, which makes it possible to realize a column-beam structure that can withstand the seismic force.
In addition, since it is not necessary to perform special construction such as applying prestress to the steel material, the construction is easy.

In one aspect of the present invention, the main body is provided with an upper concrete portion having a thickness equal to or higher than a second predetermined value above the upper surface of the joint portion, and the second body is placed on the upper surface of the upper concrete portion. Hollow precast concrete columns are provided.
According to such a configuration, the main body of the column-beam joining member is provided with an upper concrete portion having a thickness equal to or more than a second predetermined value above the upper surface of the joint portion to which the columns are connected, and the upper concrete. A second hollow precast concrete column is provided on the upper surface of the portion. That is, concrete having a thickness equal to or higher than the second predetermined value obtained by the bearing stress is interposed between the lower surface of the second column and the upper surface of the joint portion. Therefore, the stress transmission between the beam-column joint member and the second hollow RC column located on the beam-column joint member extends from the second hollow RC column to the upper concrete portion and from the upper concrete portion to the main body. It is sufficiently and surely carried out to the upper surface of the joint portion penetrating the above, which makes it possible to realize a column-beam structure that can withstand the seismic force.

In one aspect of the invention, the column comprises a main bar extending vertically between the outer surface of the column and the inner wall forming the internal space and projecting from the upper end of the column. However, the inside of the main body is inserted from the lower surface of the lower concrete portion and fixed above the upper surface of the main body.
According to such a configuration, the main bar of the column is provided between the outer surface of the column and the inner wall forming the internal space, and in the beam-column joint member, the inside of the main body is from the lower surface of the lower concrete portion. The main bar is buried in the concrete that constitutes the column or beam-column joint member because it is provided so that it can be inserted through. That is, in this configuration, unlike the structure described in Patent Document 2, the main bar is not exposed to air. Therefore, since the main bar is protected by concrete or the like, it is not necessary to apply a special fireproof coating in case of fire or the like, and therefore the construction cost can be reduced.

In one aspect of the present invention, the beam-column joint member is made of precast concrete.
With such a configuration, it is possible to reduce the number of construction man-hours at the site, and it is possible to reduce the construction period required for construction.

In one aspect of the present invention, the building structure comprises the above-mentioned column-beam frame using hollow precast concrete columns.
According to such a configuration, the above-mentioned column-beam frame can be applied.

According to the present invention, a column-beam structure using a hollow precast concrete column and a building structure provided with the column-beam structure can be reliably transmitted between a beam and a hollow reinforced concrete column and can be easily constructed. It will be possible to provide.

It is a front view of the column beam frame using the hollow PCa column shown as the embodiment of this invention. (A) is a front view, and (b) (c) (d) are cross-sectional views of the PCa columns constituting the column-beam frame. It is a perspective view of the vicinity of a column-beam joint member of the above-mentioned column-beam frame. It is a horizontal sectional view of the column-beam joining member which constitutes the said-column-beam frame. It is a side sectional view of the column-beam joint member constituting the column-beam frame. It is a front view of the 1st modification of the column beam frame using the hollow PCa column shown as the said embodiment. It is a front view of the 2nd modification of the column beam frame using the hollow PCa column shown as the said embodiment. It is sectional drawing of the PCa pillar. It is explanatory drawing of the joint structure of the conventional beam and column.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a front view of a column-beam frame 1 using a hollow PCa column shown as an embodiment of the present invention.

In the column-beam frame 1, the PCa columns 3 (3A, 3B) erected on the foundation, the floor slab 2, etc. and the beams 5 are joined by the column-beam joining member 4 provided at the column head 3a of the PCa columns 3. It is formed by being done. The PCa pillar 3 is a hollow PCa pillar 3 extending in the vertical direction and having an internal space 3c in which the upper end 3b and the lower end 3e open. On the other hand, the beam-column joint member 4 is formed by being densely filled with concrete without having a solid, that is, an internal space. In this embodiment, H-shaped steel is used as the beam 5.

2A is a front view of the PCa pillar 3, FIG. 2B is a sectional view taken along the line AA of FIG. 2A, and FIG. 2C is a sectional view taken along the line BB of FIG. 2A. 2 (d) and 2 (d) are cross-sectional views taken along the line CC of FIGS. 2 (b) and 2 (c).

In the present embodiment, the cross-sectional shape in the height direction Z, that is, the left-right direction X orthogonal to the length direction Z of the PCa pillar 3, is a rectangular shape as shown in FIGS. 2 (b) and 2 (c). The internal space 3c of the PCa pillar 3 is formed so as to extend in the height direction Z so that the cross-sectional shape in the left-right direction X is circular. Needless to say, the cross-sectional shapes of the PCa pillar 3 and the internal space 3c may be other shapes as described later.

A plurality of main bars 10 extend in the height direction Z, that is, in the length direction Z of the PCa pillar 3 between the outer surface 3g of the PCa pillar 3 and the inner wall 3f forming the internal space 3c. It is provided. The main bar 10 is provided so that the upper end 10a of the main bar 10 protrudes from the upper end 3b of the PCa column 3. A mechanical joint 12 is embedded in the lower end 3e of the PCa column 3 so that one end surface 12a is exposed from the lower end 3e, and the mechanical joint 12 is inserted between the end surface 12a and the other end surface 12b. The lower end 10b of the main bar 10 is inserted and fixed to the internal space 12c formed as described above from the end surface 12b side. As shown in FIG. 2C, the outer surface 3g of the PCa column 3 is provided with a grout injection hole 3h for communicating the internal space 12c of the mechanical joint 12 with the outside.
The hoop muscles 11 are arranged so as to surround the main muscles 10.

The PCa column 3 may be installed on the beam-column joining member 4 like the second PCa column 3B located on the upper side shown in FIG. At this time, the lower end 3e provided with the mechanical joint 12 functions as a joint with the column-beam joining member 4 and the PCa column 3A located below the beam-column joining member 4.

Next, the column-beam joining member 4 will be described with reference to FIGS. 3 to 5. FIG. 3 is an enlarged perspective view of the H arrowhead portion of FIG. 1. 4 (a) and 4 (b) are cross-sectional views of the DD and EE portions in FIG. 1 of the beam-column joining member 4 connected to the PCa column 3, respectively. Further, FIGS. 5A and 5B are cross-sectional views of the FF and GG portions in FIG. 4, respectively.

The beam-column joining member 4 includes a solid reinforced concrete main body 15 and a joint portion 16 for beam joining. The main body 15 has a substantially rectangular parallelepiped shape, and the joint portion 16 is provided on the main body 15 so as to penetrate the main body 15 in the horizontal direction and project outward from the main body 15. In the present embodiment, since the H-shaped steel is used as the beam 5 as described above, the joint portion 16 is also manufactured by using the H-shaped steel so as to be joined to the beam 5. That is, each joint portion 16 includes an upper flange 16a, a lower flange 16b, and a web 16c.

In the present embodiment, the joint portion 16B for beam joining extending in the depth direction Y is provided so as to penetrate the main body 15. Further, two joint portions 16A for beam joining extending in the left-right direction X are connected to both side surfaces of the joint portion 16B in the main body 15 in the vicinity of the substantially center in the depth direction Y, with 16 g of each end thereof. The ends 16h are provided so as to project from both side surfaces of the main body 15 in the left-right direction X. As a result, the joint portion 16A extending in the left-right direction X is also provided so as to penetrate the main body 15 as a whole.

As shown in FIG. 5, the main body 15 has a lower concrete portion 15a having a thickness equal to or more than a predetermined value below the lower surface of the joint portion 16, that is, below the lower surface 16e of the lower flange 16b of the joint portion 16. I have. Further, the main body 15 is provided with an upper concrete portion 15b having a thickness equal to or greater than a second predetermined value above the upper surface of the joint portion 16, that is, above the upper surface 16d of the upper flange 16a of the joint portion 16. ..

In the beam-column joint member 4, the lower surface 15c of the lower concrete portion 15a is connected to the upper end 3b of the PCa column 3A, and the second hollow PCa column 3B, that is, the upper PCa column is placed on the upper surface 15d of the upper concrete portion 15b. The lower end 3e of 3B is connected. As described above, the column-beam joining member 4 is provided so as to be interposed between the PCa column 3A and the second PCa column 3B. When the main body 15 is viewed in a horizontal cross section, the external shape of the main body 15 is substantially the same as the cross-sectional shape of the PCa column 3, that is, a rectangle, and the column-beam joining member 4 is provided as described above. At that time, the outer surface 3g of the PCa pillar 3 and the outer surface 15e of the main body 15 are formed so as to be smoothly continuous.

The difference in height position between the thickness T ₁ of the lower concrete portion 15a, that is, the lower surface 15c of the lower concrete portion 15a and the lower surface 16e of the lower flange 16b of the joint portion 16 is determined by the bearing stress.
Similarly, the thickness T2 of the upper concrete portion _15b , that is, the difference in height position between the upper surface 15d of the upper concrete portion 15b and the upper surface 16d of the upper flange 16a of the joint portion 16 is determined by the bearing stress.

When the column-beam joining member 4 is provided on the PCa column 3A as described above, the sheath tube has an inner diameter slightly larger than the outer diameter of the main bar 10 at the horizontal position corresponding to the main bar 10 of the PCa column 3A. 17 is provided. The sheath pipe 17 is provided so as to extend in the vertical direction so that both ends thereof are exposed on the lower surface 15c of the lower concrete portion 15a and the upper surface 15d of the upper concrete portion 15b.

The main bar 10 of the PCa column 3A is inserted through the inside of the main body 15 from the lower surface 15c of the lower concrete portion 15a and fixed above the upper surface 15d of the main body 15. That is, the main bar 10 of the PCa column 3A inserts the inside of the sheath tube 17 from the end of the sheath tube 17 exposed on the lower surface 15c of the lower concrete portion 15a, and the upper end 10a of the main bar 10 is the upper surface of the upper concrete portion 15b. It is arranged so as to project upward from the end of the sheath tube 17 exposed to 15d.

As shown in FIGS. 4 and 5, hoop bars 18 are arranged in the column-beam joining member 4 so as to surround a plurality of sheath pipes 17 extending in the vertical direction from the outside. As shown in FIG. 5B, a hole 16f is formed in the web 16c of the joint portion 16B, and at the height where the joint portion 16 is located, the hoop bar 18 is arranged by inserting the hole 16f. It is streaked. In FIG. 3, the hoop streaks 18 are not shown for the sake of brevity.

In particular, as shown in FIG. 5B, the upper end 10a of the main bar 10 is placed in the mechanical joint 12 exposed to the lower end 3e of the second hollow PCa column 3B provided on the beam-column joining member 4. It is inserted from below and fixed. A grout is filled between the mechanical joint 12 and the upper end 10a of the main bar 10 of the PCa column 3A and the lower end 10b of the main bar 10 of the second hollow PCa column 3B inserted in the mechanical joint 12. There is. In FIG. 3, for the sake of brevity, the corresponding main bar 10 and mechanical joint 12 are shown only for the sheath tube 17 located on the left side of the paper, but in reality, other sheath tubes are shown. It goes without saying that the corresponding main bar 10 and the mechanical joint 12 are similarly provided for the 17.

Between the upper end 3b of the PCa column 3A and the lower surface 15c of the column-beam joining member 4, and between the upper surface 15d of the column-beam joining member 4 and the lower end 3e of the second hollow PCa column 3B, the vicinity of the outer periphery is surrounded. A sealing member (not shown) is provided, and the inside of the sealing member is filled with grout. Grout is also filled in the gap between the inner wall of the sheath pipe 17 and the surface of the main bar 10 of the beam-column joining member 4.

In the present embodiment, the column-beam joint member 4 is made of precast concrete.

Next, a method of constructing the column-beam frame 1 shown in FIG. 1 will be described.

First, the PCa column 3 and the column-beam joining member 4 are manufactured. The production may be performed at the factory and then transferred to the construction site, or may be manufactured at the construction site.
The PCa pillar 3A that has been transferred or manufactured in the field is erected on a foundation or the like so that the upper end of the internal space 3c opens upward.

Next, after installing a sealing member (not shown) on the PCa column 3A, the column-beam joining member 4 is installed. At this time, as shown in FIG. 5B, the main bar 10 of the PCa column 3A is inserted through the sheath pipe 17 located inside the main body 15 from the lower surface 15c of the lower concrete portion 15a, and is above the upper surface 15d of the main body 15. Protrude to.

The grout is press-fitted inside the sealing member. Since the sealing member is provided so as to cover the vicinity of the outer periphery of the PCa column 3A and the beam-column joining member 4, the lower end of the sheath pipe 17 of the column-beam joining member 4 is located inside the sealing member. .. By press-fitting the grout inside the sealing member, the press-fitted grout is further press-fitted upward from the lower end of the sheath tube 17, and the grout also fills the gap between the inner wall of the sheath tube 17 and the surface of the main bar 10. Will be done.

The beam 5 is joined to the tip of the joint portion 16 of the installed column-beam joining member 4.

Further, after installing a sealing member (not shown) on the beam-column joining member 4, a second hollow PCa column 3B is installed. At this time, as shown in FIG. 5B, the upper end 10a of the main bar 10 of the PCa column 3A is inserted from below into the mechanical joint 12 exposed at the lower end 3e of the second hollow PCa column 3B.
The grout is press-fitted inside the sealing member. Further, it is shown in FIG. 2 between the mechanical joint 12 and the upper end 10a of the main bar 10 of the PCa column 3A inserted in the mechanical joint 12 and the lower end 10b of the main bar 10 of the second hollow PCa column 3B. The grout is filled from the hole 3h.

Next, the operation and effect of the column-beam frame using the hollow PCa column and the building structure provided with the column-beam frame, which are shown in the above-described embodiment, will be described.

According to such a configuration, as shown in FIG. 5, the main body 15 of the column-beam joining member 4 horizontally penetrates the main body 15 and is connected to the joint portion 16 and the joint portion 16. Below the lower surface 16e, a lower concrete portion 15a having a thickness T ₁ of a predetermined value or more is provided, and since the lower surface 15c of the lower concrete portion 15a is connected to the column 3, the upper surface 3b of the column 3A and the joint portion A concrete having a thickness of _a predetermined value T1 or more determined by the bearing stress is interposed between the lower surfaces 16e of the 16. As a result, the stress transmission between the beam-column joint member 4 and the hollow RC column 3A located under the beam-column joint member 4 extends from the lower surface 16e of the joint portion 16 penetrating the main body 15 to the lower concrete portion 15a. , From the lower concrete portion 15a to the hollow RC column 3A, it is sufficiently and surely performed, which makes it possible to realize the column-beam frame 1 that can withstand the seismic force.

Further, the main body 15 of the column-beam joining member 4 is provided with an upper concrete portion 15b having a thickness T ₂ of a second predetermined value or more above the upper surface 16d of the joint portion 16 to which the column 3 is connected. Since the second hollow PCa column 3B is provided on the upper surface 15d of the upper concrete portion 15b, it is obtained by bearing stress between the lower surface 3e of the second hollow PCa column 3B and the upper surface 16d of the joint portion 16. A second predetermined value T ₂ or more thick concrete is interposed. As a result, the stress transmission between the beam-column joining member 4 and the second hollow PCa column 3B located on the beam-column joining member 4 extends from the second hollow PCa column 3B to the upper concrete portion 15b. It is sufficiently and surely performed from the upper concrete portion 15b to the upper surface 16d of the joint portion 16 penetrating the main body 15, which makes it possible to realize the column-beam frame 1 capable of withstanding the seismic force.

Further, the main bar 10 of the column 3 is provided between the outer surface 3g of the column 3 and the inner wall 3f forming the internal space 3c, and in the column-beam joining member 4, from the lower surface 15c of the lower concrete portion 15a. Since the main body 15 is provided so as to be inserted through the inside of the main body 15, the main bar 10 is embedded in the concrete or the like constituting the column 3 or the column-beam joining member 4. That is, in this configuration, the main bar 10 is not exposed to air. Therefore, since the main bar 10 is protected by concrete or the like, it is not necessary to apply a special fireproof coating in case of fire or the like, and therefore the construction cost can be reduced.

In addition, since it is not necessary to perform special construction such as applying prestress to the main bar, the construction is easy.

Further, since the column-beam joining member 4 is made of precast concrete, it is possible to reduce the number of construction man-hours at the site and reduce the construction period required for construction.

In addition, since the pillar 3 is a lightweight hollow PCa pillar, a large lifting machine or a transporting machine is not required, and since a lifting machine with a long boom can be used, there is a place where the pillar can be installed with one lifting machine. It is possible to achieve the effects of increasing the size and improving the construction speed due to the ease of installation, which can reduce the construction cost.
Since the pillar 3 is a hollow PCa pillar, the concrete volume is reduced, so that the construction cost can be reduced, and since the internal space 3c has a hollow cross section containing air, the fire resistance performance can be improved. It is possible.

(First modification of the embodiment)
Next, with reference to FIG. 6, a first modification example of the column-beam frame 1 shown as the above embodiment will be described. FIG. 6 is an explanatory view of the column-beam frame 30 in the first modification. The column-beam frame 30 in the first modification is different from the above-mentioned column-beam frame 1 in that the internal space of a part of the PCa columns 3C is filled with concrete.

In the hollow PCa column 3C located in a place where the variable axial force is large, such as the brace 13 and the foot of the multi-story shear wall, as shown as the four columns 3C in the center of FIG. 6, the internal space thereof Filled with concrete, it becomes a solid pillar 3C. The other columns in FIG. 6, i.e., the PCa columns 3D shown at the left and right ends, remain hollow and are not filled with concrete.

Filling the hollow PCa pillar 3C with concrete is performed by providing an injection port (not shown) communicating with the internal space on the side surface of the hollow PCa pillar 3C and pressing concrete from this injection port.

According to such a configuration, since the internal space of the hollow PCa column 3C where a large force acts is filled with concrete to strengthen the column, it is more tough while considering the weight reduction of the building structure. It is possible to realize a column-beam frame 30.

In particular, in the column-beam structure 30, after the column-beam structure 1 in the above embodiment is constructed with the hollow PCa column 3 and the column-beam joining member 4 as the framework of the building structure, concrete is filled only in the necessary columns 3. Since it is possible to construct with, there is a place where a pillar can be installed with one lifting machine because a lifting machine with a long boom can be used, which does not require a large lifting machine or a transporting machine as described in the above embodiment. It is possible to achieve the effects of increasing the size and improving the construction speed due to the ease of installation, whereby the effects caused by the use of the hollow PCa pillar are not impaired.

Needless to say, the first modification has the same effect as that of the above embodiment.

(Second variant of the embodiment)
Next, a second modification of the column-beam frame 1 shown as the above embodiment will be described with reference to FIG. 7. FIG. 7 is an explanatory view of the column-beam frame 40 in the second modification. The second modification is a further modification of the first modification. The beam-column structure 40 in the second modification has an internal space extending in the vertical direction in a part of the beam-column joint member 41 with the beam-column structure 30 in the first modification. This internal space is different in that it is filled with concrete after the beam-column joint member 41 is installed.

In FIG. 7, a column-beam joining member 41 is installed on the four columns 3C shown in the center. The column-beam joining member 41 is made of precast concrete, similarly to the column-beam joining member 4 shown in the above embodiment. In the state immediately after production, before the column-beam joining member 41 is installed on the column 3C, an internal space extending vertically and opening to the upper surface 41d and the lower surface 41c inside the column-beam joining member 41. It is equipped with 41a. As described in the first modification, the hollow PCa column 3C is filled with concrete, and at this time, the internal space 41a of the column-beam joining member 41 is also filled with concrete. The other beam-column joining member of FIG. 7, that is, the beam-column joining member 4 shown at both the left and right ends is the beam-column joining member 4 having no internal space as shown in the above embodiment.

Since each of the beam-column joining member 41 and the hollow PCa column 3C has an internal space extending in the vertical direction and opening to the upper surface and the lower surface, the internal spaces of the beam-column joining member 41 and the hollow PCa column 3C are connected to each other. Communicate with each other.

According to such a configuration, when concrete is press-fitted into the hollow PCa column 3C, an injection port is provided only in a part, for example, the hollow PCa column 3C of the lowermost layer, and concrete is press-fitted from this injection port. By doing so, the concrete is collectively formed into the plurality of beam-column joining members 41 and the hollow PCa column 3C joined in the height direction via the internal space of the column-beam joining member 41 and the hollow PCa column 3C that communicate with each other. Can be filled. This makes it possible to more easily carry out the construction of the first modification described above.

Needless to say, the second modification has the same effect as the above-described embodiment and the first modification.

The column-beam frame using the hollow PCa column of the present invention and the building structure provided with the column-beam frame are not limited to the above-described embodiment and each modification described with reference to the drawings. Various other variants are conceivable within its technical scope.
For example, in the above-described embodiment and each modification, as shown in FIG. 2, the hollow PCa pillar has a rectangular outer circumference and a circular cross-sectional shape on the wall surface forming the internal space. Not limited. An example of another shape of the hollow PCa column is shown in FIG. As shown in FIG. 8, the cross-sectional shape of the outer periphery may be another shape such as a circle or an octagon, and the cross-sectional shape of the internal space may be another shape such as a rectangle or an octagon. Needless to say, other shapes not shown in FIG. 8 may be used.
Further, in the above-described embodiment and each modification, the column-beam joint member 4 is made of precast concrete, but it may be manufactured by placing concrete on site. In this case, since the main bar of the hollow PCa column can be passed through the beam-column joint member 4 in advance, the sheath pipe becomes unnecessary, and accordingly, the grout injection work into the sheath pipe becomes unnecessary.

In addition to this, as long as the gist of the present invention is not deviated, it is possible to select the configurations described in the above-described embodiment and each modification, or to appropriately change to other configurations.

1 Pillar beam frame 3 Hollow PCa pillar (pillar)
3a Pillar head 3b Upper end 3c Internal space 3e Lower end 3f Inner wall 3g Outer surface 3B Second hollow PCa Pillar 4 Pillar beam joint member 5 Beam 10 Main bar 15 Main body 15a Lower concrete part 15b Upper concrete part 15c Lower concrete part lower surface 15d Upper concrete Upper surface of the part 16 Joint part 16d Upper surface of the joint part 16e Lower surface of the joint part 30 Column-beam frame 40 Column-beam frame 41 Column-beam joint member

Claims (1)

A column-beam structure in which a reinforced concrete column and an H-shaped steel beam are joined by a column-beam joining member provided at the capital of the column.
The pillar is a hollow precast concrete pillar extending in the vertical direction and having an internal space in which the upper end and the lower end are open.
The column-beam joining member is made of solid reinforced concrete and has a substantially rectangular parallelepiped shape , a joint portion for beam joining that horizontally penetrates the main body and protrudes to the outside of the main body, and is embedded in the main body. With a rectangular hoop streak that surrounds the main bar ,
Each of the hoop bars is arranged in parallel with each side of the main body so as to surround the two main bars among the plurality of main bars located at the four corners of the cross section of the main body.
The main body is provided with a lower concrete portion having a thickness equal to or higher than a predetermined value below the lower surface of the joint portion, and a hollow precast concrete column in which the lower surface of the lower concrete portion is connected to the column. The column-beam frame used.

Images