JP6792329B2 - Construction method of column beam frame using precast concrete columns - Google Patents

Description

The present invention relates to a method of constructing a column-beam frame using precast concrete columns.

As a column-beam frame of a building structure, for example, a composite structure in which columns are made of reinforced concrete and beams are made of steel is widely used because it has a better balance between construction cost and construction period than steel-framed and reinforced concrete structures. There is.

When using the above-mentioned composite structure and trying to further reduce the construction period, it takes a lot of man-hours and labor to construct the reinforced concrete columns (hereinafter referred to as RC columns), and the construction period becomes long. Therefore, the construction of RC columns becomes a bottleneck. However, if the PCa ratio of the RC columns is increased in order to shorten the construction period by trying to realize the whole or many parts of the RC columns with precast concrete (hereinafter referred to as PCa), the weight of the RC columns becomes heavy. Large-scale heavy-duty machines and transport machines are required for delivery and installation at the site, which increases construction costs. Therefore, it is necessary to reduce the PCa ratio of RC columns to reduce the weight of RC columns, and at the same time, a construction method that 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 which is formed so as to have an internal space where the upper end is open to reduce the PCa rate and reduce the weight. Is being done. By placing concrete in the internal space of the column after the hollow RC column is erected, it is possible to reduce the weight of the RC column and shorten the construction period. Patent Document 1 discloses such a PCa pillar.

When a hollow RC column is used, a panel zone having a tubular body having an internal space in which the upper end and the lower end are open and a joint member for beam joining that penetrates the tubular body in the horizontal direction is provided. It is installed on the top of a hollow RC column, and the column and beam may be joined by a panel zone. In the construction of such a column-beam frame, if the panel zone is installed on the upper part of the column before concrete is placed in the internal space of the column, the tremie pipe is passed from the upper part of the panel zone through the panel zone to pass the internal space of the column. Concrete will be cast at the same time into the internal space of the pillar and the inside of the panel zone. However, since the steel frames that form the beams such as the joint members and the reinforcing bars of the columns are densely arranged inside the panel zone, the tremie pipe is inserted from the upper part of the panel zone and concrete is placed. Is not easy.

Therefore, in the construction of such a column-beam frame, concrete is placed in the internal space of the column by locating the tremie pipe from the upper part of the hollow RC column in the internal space of the column before installing the panel zone, and then the upper part of the column is constructed. In many cases, a panel zone is set up in the building, and concrete is cast again inside the panel zone from above the panel zone.

As another construction method using a hollow RC column, Patent Document 2 discloses a concrete strength striking method for columns and beams as shown in FIG. In the construction method disclosed in Patent Document 2, the PCa pillar 200 as shown in FIG. 17A is used. The PCa column 200 is made of hollow precast concrete with main bars (not shown) extending in the vertical direction, and prefabricated reinforcing bars 203 and hoop bars 204 are arranged above.

First, as shown in FIG. 17A, the ground-assembled precast column 200 is hung at the place where the core bar 207 is built by the core bar joint 208. Next, as shown in FIG. 17B, the beam portions of the suspended precast columns 200 are joined by the beam main bar joint 209. Further, as shown in FIG. 17C, the core bar 210 on the upper floor is joined to the upper part of the core bar 207 of the precast column 200. Finally, as shown in FIG. 17D, high-strength concrete is press-fitted by the pump 214 from below the precast column 200 that has been built.

Japanese Unexamined Patent Publication No. 2004-332236 Japanese Unexamined Patent Publication No. 7-207751

First, in the method using the panel zone as described above, the concrete must be placed in two stages, which causes a problem that the number of man-hours increases.

In addition, when placing concrete from the top of hollow RC columns or panel zones, it is necessary to use a vibrator to fill the concrete. The work itself of applying the vibrator requires time and effort, and therefore the construction man-hours increase and the construction cost increases. Further, in this case, since the air bubbles in the concrete generated by the vibrator are accumulated directly under the lower surface of the horizontally installed joint member, it is difficult to secure the filling property of the concrete directly under the lower surface of the joint member. ..

In addition, when concrete is poured from the upper part of the hollow RC column or panel zone, it is difficult to secure the filling property of the concrete as described above, so the PCa part is scraped to confirm the filling property. , It is necessary to visually check by cutting. That is, it is not easy to confirm the filling property.

Further, if the gap between the lower surface of the joint member and the concrete placed in the first stage is small, the concrete does not sufficiently spread below the lower surface of the joint member in the second stage of concrete placement. Therefore, the panel zone needs to be installed with a sufficient distance between the lower surface of the joint member and the concrete placed in the first stage, for example, 300 mm. At this time, it may be necessary to install the formwork between the panel zone and the upper surface of the hollow RC column, and more construction man-hours are required to install the formwork.

Next, in the construction method described in Patent Document 2, since the hollow precast pillar 200 has a pillar portion and a portion corresponding to the above panel zone integrated, it is very difficult to manufacture the hollow precast pillar 200. It is not realistic. As one method for producing the hollow precast pillar 200, it is conceivable to form the internal space of the precast pillar 200 by partitioning it with a lath net or the like, and then cast concrete around the lath net. However, since the joint portion between the column and the beam of the precast column 200 is reinforced concrete, the structure is such that the reinforcing bars and steel frames are densely packed, and in such a structure, it is easy to partition the internal space by using a lath net or the like. is not.

As another method for producing the hollow precast column 200, it is conceivable to centrifuge the precast column 200. However, in the precast column 200, the prefabricated reinforcing bar beam 203 and the hoop reinforcing bar 204 protrude outward from the panel zone, and it is difficult to manufacture the formwork and the rotating bed for centrifugal shaping in such a state. Man-hours and costs are high for production.

An object to be solved by the present invention is to provide a method for constructing a beam frame using precast concrete columns, which enables reliable filling of concrete, easy construction, and reduction of construction cost. ..

The present invention employs the following means in order to solve the above problems. That is, the method of constructing a column-beam structure using a precast concrete column according to the present invention is to join a beam to a column head of an erected precast concrete column using a column-column joining member, and the precast concrete column is The precast concrete column has an internal space at which the upper end opens, and a press-fitting opening for communicating the internal space with the outside is provided near the lower end of the internal space on the side surface of the precast concrete column. The joining member includes an outer shell having an internal space in which the upper end and the lower end are open, and a joint member for beam joining that is horizontally connected to the outer shell and projects outward from the outer shell. The precast concrete column is erected, and the column / beam joining member is installed on the precast concrete column so that the internal spaces of both the precast concrete column and the column / beam joining member communicate with each other. , Including press-fitting concrete from the press-fitting opening of the precast concrete column to fill the internal spaces of both the precast concrete column and the column-beam joint member.
According to such a configuration, concrete is press-fitted through the press-fitting opening of the PCa column to simultaneously fill the internal spaces of both the PCa column and the column-beam joint member, so that the concrete is placed only once. This not only reduces the number of times concrete is cast, but also eliminates the need to install a formwork between the panel zone and the upper surface of the hollow RC column. In addition, it is not necessary to insert the tremie pipe while avoiding the reinforcing bars and steel frames. Therefore, it is possible to facilitate the construction and reduce the construction man-hours.
In addition, concrete is not cast from the upper part of the beam-column joint member, but is cast from the press-fitting opening provided near the lower end of the internal space, that is, concrete is cast by press-fitting from below the internal space, so that the vibrator is used. Does not require the work of applying. Therefore, it is possible to reduce the construction man-hours.
In particular, when the joint member penetrates the outer shell in the horizontal direction, the fact that the work of applying the vibrator is not required as described above means that the possibility that air bubbles are less likely to accumulate under the lower surface of the joint member is low. Means. That is, concrete can be filled more densely in the lower surface of the joint member as compared with the conventional method. Therefore, it is easy to secure the filling property of concrete, and it is basically unnecessary to confirm the filling property.
In addition to the above, according to the above configuration, the PCa column is separated and formed as a member separate from the beam-column joining member, that is, the panel zone. Therefore, in the production of the PCa column, for example, PCa An inner formwork is installed in the formwork that forms the outer circumference of the pillar, concrete is poured around them, and then the inner formwork is removed, which is applied to the production of general box culverts. It is possible to apply a simple method. That is, it is possible to manufacture the PCa pillar at low cost, and it is possible to reduce the construction man-hours and improve the filling property of concrete by a method that is realistic and easy to carry out.
In addition to a simple method such as that applied to the production of a general box culvert, a method of burying a spiral steel void or the like in the center of a pillar and not removing the mold may be used. This method is suitable when there are few identical PCa members and it is not rational to manufacture an inner formwork.

In one aspect of the present invention, the joint member horizontally penetrates the outer shell body, and is below the lower surface of the portion of the joint member located inside the outer shell body. An anchor material extending in the direction is fixed, and the anchor material is inserted into the internal space of the precast concrete column when the beam-column joining member is installed on the precast concrete column. ..
According to such a configuration, for example, even when the span between columns is long, the bending moment acting on the beam can be reliably transmitted to the column by the anchor material inserted in the internal space of the PCa column. .. Therefore, it is possible to realize a tough skeleton.

In one aspect of the present invention, the method of constructing a beam-column structure using a precast concrete column is a method of constructing a beam-column structure between an erected precast concrete column and the beam-column joint member, or between the precast concrete column and the beam-column joint. It includes installing a sealing member on the outer periphery of the joint portion of the member.
According to such a configuration, since the sealing member is installed between the beam-column joint member and the PCa column or around the joint portion between the beam-column joint member and the PCa column so as to surround the joint portion. It is possible to prevent the concrete press-fitted into the internal space between the beam-column joint member and the PCa column from flowing out from between the beam-column joint member and the PCa column. Therefore, it is possible to effectively secure the filling property of concrete.

In one aspect of the present invention, the method of constructing a beam-column structure using precast concrete columns opens the lower end in addition to the upper end on the installed beam-column joint member before filling the concrete. In the press-fitting of the concrete, the concrete includes installing a second precast concrete column having an internal space and installing a second beam-beam joining member on the second precast concrete column. Is filled in each internal space of the precast concrete column and the beam-column joining member, and also in each internal space of the second precast concrete column and the second beam-column joining member.
According to such a configuration, concrete can be cast on a plurality of layers of PCa columns at a time, so that the construction man-hours can be effectively reduced.

In one aspect of the present invention, the outer shell body has an extension portion extending outward in the extending direction of the joint member, and the extension portion has a beam insertion opening. In the method of constructing a beam-column structure using precast concrete columns, the beam is joined to the joint member by inserting the beam insertion opening of the column-beam joining member before filling the concrete. In addition to the internal spaces of the precast concrete column and the beam-column joint member, the concrete is also filled around the end of the beam located in the extension portion in the press-fitting of the concrete. ..
According to such a configuration, when the beam end is made of steel-framed reinforced concrete, the concrete at the beam end can be placed at the same time as the beam-column joining member and the PCa column are placed in the internal space. Therefore, it is possible to reduce the work man-hours more effectively.

According to the present invention, it is possible to provide a method for constructing a beam-column frame using precast concrete columns, which enables reliable filling of concrete, easy construction, and reduction of construction cost.

It is a front view of a part of the beam-column frame to be constructed in the construction method of the column-beam frame using PCa shown as the embodiment of the present 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 column-beam joint member constituting the column-beam frame. It is explanatory drawing of the sealing member which comprises the said column beam frame. It is a perspective view explaining the said construction method. It is a perspective view explaining the said construction method. It is explanatory drawing of the 1st modification of the construction method of the pillar-beam structure using PCa shown as the said embodiment. It is explanatory drawing of the 2nd modification of the construction method of the column beam frame using PCa shown as the said embodiment. It is a perspective view explaining the 3rd modification of the construction method of the column beam frame using PCa shown as the said Embodiment. It is sectional drawing explaining the 3rd modification of the construction method of the column beam frame using PCa shown as the said Embodiment. It is a perspective view explaining the 3rd modification of the construction method of the column beam frame using PCa shown as the said Embodiment. It is a perspective view explaining the 3rd modification of the construction method of the column beam frame using PCa shown as the said Embodiment. It is explanatory drawing of the 4th modification of the construction method of the column beam frame using PCa shown as the said embodiment. It is explanatory drawing of the 5th modification of the construction method of the column beam frame using PCa shown as the said embodiment. It is explanatory drawing of the 6th modification of the construction method of the column beam frame using PCa 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 part of a beam-column frame 1 constructed in the method of constructing a beam-column frame using PCa shown as an embodiment of the present invention.
The column-beam frame 1 is formed by joining a beam 5 to a column head 3a of a PCa column 3 erected on a foundation, a floor slab 2, or the like by using a column-beam joining member 4. Immediately after the PCa column 3 and the column-beam joint member 4 are installed on the foundation 2 or the like, both have an internal space, and later, concrete is press-fitted into the internal space to fill the column-beam. The frame 1 is formed.

FIG. 2A is a front view of the PCa pillar 3 before installation, that is, before placing concrete in the internal space, and FIG. 2B is a cross-sectional view taken along the line AA'of FIG. 2A. 2 (c) is a cross-sectional view taken along the line BB'of FIG. 2 (a), and FIG. 2 (d) is a cross-sectional view taken along the line CC'of FIGS. 2 (b) and 2 (c).

The PCa pillar 3 has an internal space 3c in which the upper end 3b opens. In the present embodiment, the cross-sectional shape of the PCa pillar 3 in the width direction Y orthogonal to the length direction X is a rectangular shape as shown in FIGS. 2B and 2C. The internal space 3c of the PCa pillar 3 is formed so as to extend in the length direction X so that the cross-sectional shape in the width direction Y is circular. Needless to say, the cross-sectional shapes of the PCa pillar 3 and the internal space 3c may be other shapes as will be described later.

Further, in the present embodiment, the internal space 3c of the PCa pillar 3 has an opening at the lower end 3e in addition to the upper end 3b. When the PCa pillar 3 is erected on a foundation, a floor slab 2, or the like, the surface of the foundation or the like becomes the bottom surface of the internal space 3c, and the vicinity of the lower end 3e of the PCa pillar 3 becomes the vicinity of the lower end of the internal space 3c. .. A press-fitting opening 3d for communicating the internal space 3c with the outside is provided near the lower end of the internal space 3c on the side surface 3g of the PCa pillar 3. In the column-beam frame 1 shown in FIG. 1, concrete is press-fitted into the internal space 3c as described above, and the press-fitting opening 3d is closed by the concrete.

Between the side surface 3g of the PCa pillar 3 and the inner wall 3f of the internal space 3c, a plurality of main bars 10 are installed so as to extend in the length direction X of the PCa pillar 3. The main bar 10 is installed so that the upper end 10a of the main bar 10 projects 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 into the internal space 12c formed in the above and fixed. As shown in FIG. 2C, a hole 3h for injecting grout is provided on the side surface 3g of the PCa pillar 3 so as to communicate the internal space 12c of the mechanical joint 12 with the outside.
The rib muscles 11 are arranged so as to surround the main muscle 10.

As will be described later as a third modification, the PCa column 3 may be installed on another member, for example, a column-beam joint member 4 described below. At this time, the lower end 3e provided with the mechanical joint 12 functions as a joint with another member.

As shown in FIG. 5B, a level adjusting bolt 3i is provided on the upper end 3b of the PCa pillar 3. A beam-column joining member 4 is installed on the upper end 3b of the PCa column 3 as described later. At the time of this installation, the height of the beam-column joining member 4 is adjusted by the level adjusting bolt 3i.

FIG. 3 is a perspective view of the beam-column joining member 4. The beam-column joining member 4 includes an outer shell body 21 and a joint member 20 for beam joining.

In the outer shell 21, four rectangular steel plates having substantially the same shape and positioned parallel to the vertical direction are joined perpendicularly to each other on the side sides, and the thickness direction of the steel plates, that is, the horizontal direction in FIG. It is formed so that the cross-sectional shape in Y is a rectangular tubular body. As a result, the outer shell body 21 has an internal space 22 in which the upper end and the lower end are open.

The joint member 20 is provided so as to be horizontally connected to the outer shell body 21 and project outward from the outer shell body 21. More specifically, the facing steel plate of the outer shell 21 is provided with an opening 21a having a cross-sectional shape of the joint member 20, and the joint member 20 is provided with an opening provided in each of the facing steel plates. It is installed so as to insert the 21a, that is, to penetrate the outer shell body 21 in the horizontal direction. In the present embodiment, H-shaped steel is used as the beam, and the joint member 20 is also manufactured using H-shaped steel in order to join the beam. Therefore, the opening 21a has substantially the same shape as the cross-sectional shape of the H-shaped steel.

A plurality of openings 20a are opened near the inner surface of the outer shell body 21 of the joint member 20, and hoop muscles 23 are installed through the openings 20a. The hoop muscle 23 is installed so as to circulate slightly inside the inner surface of the outer shell 21 and to follow the inner surface in the horizontal direction. The one hoop bar 23 is cut to a length such that both ends of the hoop bar 23 overlap with each other when the hoop bar 23 is installed so as to circulate as described above, and the overlapping portion is welded and fixed.

A level adjusting bolt 26 is joined to the upper surface of the joint member 20. As will be described later as a third modification, the PCa column 3 may be installed on the beam-column joint member 4, and at the time of this installation, the height of the PCa column 3 is adjusted by the level adjusting bolt 26. Will be done.

FIG. 4A is an enlarged cross-sectional view of the arrowhead portion D in FIG. As shown in this figure, the upper L-shaped steel 24 is on the outer upper end of each steel plate constituting the outer shell body 21 of the beam-column joining member 4, and the outer surface of one of them faces upward and the upper end of the steel plate. They are joined so that they are located parallel to the same height as the sides. Further, at the outer lower end of each steel plate constituting the outer shell body 21 of the beam-column joining member 4, a lower L-shaped steel 25 is provided, and the outer surface 25a of one of them faces downward and has the same height as the lower end side of the steel plate. It is joined so that it is located parallel to the vertical position.

The distance between the inner surfaces 21b of the opposing steel plates of the outer shell 21 of the beam-column joint member 4, that is, the inner dimension is slightly larger than the dimension between the side surfaces 3g on the opposite side of the PCa column 3. The column-beam joint member 4 is formed.

As shown in FIGS. 1 and 4A, the column-beam joining member 4 is installed on the stigma 3a of the erected PCa column 3. The PCa column 3 has an internal space 3c in which the upper end 3b opens, and the column-beam joining member 4 has an internal space 22 in which the lower end opens. Further, the inner dimension of the outer shell body 21 of the beam-column joint member 4 is larger than the outer dimension of the PCa column 3 as described above. Therefore, when the beam-column joining member 4 is installed in this way, the internal space 3c of the PCa column 3 and the internal space 22 of the beam-column joining member 4 communicate with each other before the concrete is placed. By press-fitting concrete into the communicating internal spaces 3c and 22, a column-beam frame 1 as shown in FIG. 1 is formed.

FIG. 4 (b) is an enlarged view of the arrow viewing portion of FIG. 4 (a). An upper L-shaped steel 30 is joined to the outer upper end of the PCa column 3 so that one of the outer surfaces 30a faces upward and is positioned parallel to the upper end 3b of the PCa column 3. .. The sealing member 31 is installed so as to be sandwiched between the lower surface 25a of the lower L-shaped steel 25 of the beam-column joining member 4 and the upper surface 30a of the upper L-shaped steel 30 of the PCa column 3.

The sealing member 31 surrounds the opening of the PCa pillar 3, and in particular, in the present embodiment, the inner wall 31a of the sealing member 31 is at the same position as the outer side surface 3g of the PCa pillar 3, or the outer side surface 3g. It is installed so that it is located slightly outside. As the sealing member 31, for example, a gasket made of CR sponge or the like may be used. In this case, as shown in FIG. 4B, after the sealing member 31 is installed on the upper surface 30a of the upper L-shaped steel 30 of the PCa column 3, the lower L-shaped steel 25 of the column-beam joining member 4 is placed on the sealing member 31. Since the column-beam joining member 4 is installed so that the lower surface 25a is located, the sealing member 31 is compressed vertically and extends in the lateral direction. It is necessary to install the sealing member 31 in consideration of this extension so that the position of the inner wall 31a of the sealing member 31 after the installation of the beam-column joining member 4 satisfies the above position condition.

As shown in FIG. 4A, the main bar 10 of the PCa column 3 is inserted through the internal space 22 of the beam-column joining member 4, so that the upper end 10a of the main bar 10 is located above the beam-column joining member 4. It is installed in. As described above, the internal space 22 of the column-beam joining member 4 is filled with concrete to form the column-beam frame 1 as shown in FIG. Therefore, the portion located in the internal space 22 such as the main bar 10 of the PCa column 3, the joint member 20 of the beam-column joining member 4, and the hoop bar 23 are the column-beam frame 1 after concrete placement shown in FIG. Is buried in concrete.
In the present embodiment, the outer shell 21 of the column-beam joining member 4 is a discard form, and has not been removed even after the construction of the column-beam frame 1 of FIG.

Next, a method of constructing the column-beam frame 1 shown in FIG. 1 will be described with reference to FIGS. 5 and 6.

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

At this time, the press-fitting metal fitting 40 is installed in the press-fitting opening 3d of the PCa pillar 3 shown in FIG. The press-fitting metal fitting 40 is attached by tightening with a bolt or the like to an insert (not shown) installed around the press-fitting opening 3d of the PCa pillar 3. The press-fitting metal fitting 40 may be installed on the PCa pillar 3 immediately after the production of the PCa pillar 3 and then transferred to the construction site.

Further, the sealing member 31 is installed around the opening at the upper end of the erected PCa pillar 3. More specifically, as described with reference to FIG. 4, when the column-beam joining member 4 is installed later, the inner wall 31a of the sealing member 31 extending in the lateral direction becomes the outer side surface 3g of the PCa column 3. The sealing member 31 is installed at the same position or slightly outside the outer side surface 3g.

Next, as shown in FIG. 5, on the PCa column 3 and more specifically around the opening at the upper end so that the internal spaces 3c and 22 of both the PCa column 3 and the beam-column joining member 4 communicate with each other. The column-beam joining member 4 is installed on the installed sealing member 31.

At this time, as shown in FIG. 5C, the main bar 10 of the PCa column 3 has its upper end 10a inserted through the internal space 22 of the beam-column joining member 4 and is opened through the opening of the upper end of the beam-column joining member 4. Install so that it protrudes. The upper end 10a of the main bar 10 is inserted into the internal space 22 in a state where the main bars 10 located close to each other are narrowed down by a number line or the like, and when the number line is cut and the main bar 10 is released after the insertion, the column-beam joining member at the time of insertion is obtained. It is easily possible to prevent interference with 4.
Further, before the concrete is placed in the internal spaces 3c and 22, the beam-column joining member 4 is not joined to the PCa column 3 and is temporarily placed. Therefore, the position of the beam-column joining member 4 In order to prevent displacement, the lower surface of the joint member 20 and the outer side surface 3g of the PCa pillar 3 are fixed with a turnbuckle 41 or the like.

Further, as shown in FIG. 6, after joining the beam 5 to the joint member 20 of the column-beam joining member 4, the concrete press-fitting pipe 43 is connected to the press-fitting metal fitting 40, and the concrete press-fitting pipe 43 is connected by a pump (not shown) or the like. The concrete 42 is press-fitted to fill the internal spaces 3c and 22 of both the PCa column 3 and the beam-column joint member 4. As shown in FIG. 2, since the press-fitting opening 3d is provided near the lower end of the internal space 3c, as the concrete 42 is press-fitted from the press-fitting opening 3d, the upper surface of the concrete 42 becomes the internal space of the PCa column 3. Ascend 3c. When the upper surface of the concrete 42 exceeds the upper end 3b of the PCa column 3, the concrete 42 is subsequently cast into the internal space 22 of the beam-column joint member 4, as shown in FIG. 6B.

Finally, after the concrete 42 is cured and hardened, the press-fitting metal fitting 40 is removed, and the recesses such as inserts are filled with mortar or the like to repair the concrete 42, thereby causing PCa around the press-fitting opening 3d shown in FIG. Smooth the side surface 3g of the pillar 3.

Next, the operation and effect of the construction method of the column-beam frame using PCa shown as the above embodiment will be described.

In the column-beam frame 1 as shown in FIG. 1, which was constructed by such a construction method, the concrete 42 was formed from the press-fitting opening 3d of the PCa column 3 shown in FIG. 2 as shown in FIG. Since the internal spaces 3c and 22 of both the PCa column 3 and the beam-column joining member 4 are simultaneously filled by press-fitting, the concrete 42 can be placed only once. This not only reduces the number of times the concrete 42 is cast, but also eliminates the need to install a formwork between the beam-column joining member 4 and the upper surface of the PCa column 3. In addition, it is not necessary to insert the tremie pipe while avoiding the reinforcing bars and steel frames. Therefore, it is possible to facilitate the construction and reduce the construction man-hours.

Further, the concrete 42 is not cast from the upper part of the beam-column joint member 4, but is performed from the press-fitting opening 3d provided near the lower end of the internal space 3c of the PCa column 3 shown in FIG. 2, that is, inside. Since the concrete 42 is cast by press fitting from below the space 3c, the work of applying a vibrator is not required. Therefore, it is possible to reduce the construction man-hours.

As described above, the fact that the work of applying the vibrator is not required means that it is unlikely that air bubbles will accumulate below the lower surface of the joint member 20 of the beam-column joint member 4. That is, the concrete 42 can be densely filled even below the lower surface of the joint member 20. Therefore, it is easy to secure the filling property of the concrete 42, and it is basically unnecessary to confirm the filling property.

In addition to the above, according to the above configuration, the PCa column 3 is formed separately as a member separate from the beam-column joining member 4, and therefore, in the production of the PCa column 3, for example, the PCa column As applied to the production of general box culverts, in which the inner formwork is installed in the formwork forming the outer circumference of 3 and concrete is cast around them, and then the inner formwork is removed. It is possible to apply a simple method. That is, it is possible to manufacture the PCa pillar 3 at low cost, and it is possible to reduce the construction man-hours and improve the filling property of the concrete 42 by a method that is realistic and easy to carry out. ..

Further, as shown in FIG. 4, since the sealing member 31 is installed between the beam-column joining member 4 and the PCa column 3, it is press-fitted into the internal spaces 3c and 22 of the beam-column joining member 4 and the PCa column 3. It is possible to prevent the outflow of the solid concrete 42 from between the beam-column joint member 4 and the PCa column 3. Therefore, it is possible to effectively secure the filling property of the concrete 42.

The sealing member 31 surrounds the opening of the PCa pillar 3, and particularly in the present embodiment, is the inner wall 31a of the sealing member 31 shown in FIG. 4 at the same position as the outer side surface 3g of the PCa pillar 3? Since it is installed so as to be slightly outside the outer side surface 3 g, it is possible to prevent the concrete 42 located at the height of the sealing member 31 from being partially thinner than the PCa pillar 3. Is. As a result, it is possible to realize a robust beam-column frame 1 while ensuring the filling property of the concrete 42 as described above.

Further, the column-beam joining member 4 is a portion where columns and beams are joined and many reinforcing bars and steel frames, or these joint members are inserted, and structurally particularly toughness is required. In the present embodiment, the distance between the inner surfaces 21b of the opposing steel plates of the outer shell 21 of the beam-column joining member 4, that is, the inner dimension is larger than the outer dimension of the PCa column 3. Therefore, even if the position of the outer shell 21 deviates from the planned position due to a construction error or the like and the thickness of the concrete 42 filled in the internal space 22 of the beam-column joint member 4 is slightly reduced, the joint portion The risk of impairing the strength of the concrete can be reduced.

(First modification of the embodiment)
Next, with reference to FIG. 7, a first modification example of the column-beam frame 1 shown as the above embodiment will be described. FIG. 7 is an explanatory view of the column-beam frame 50 in the first modification. The beam-column frame 50 in the first modification is the same as the beam-column frame 1 in the outer shell 53 of the joint member 52 that horizontally penetrates the outer shell 53 of the beam-column joining member 51. The difference is that the anchor member 54 extending downward is fixed to the lower surface of the portion located in the direction.

In the beam-column joining member 51 as described above, as shown in FIG. 7A, the anchor material 54 is inserted into the internal space 3c of the PCa column 3 when it is installed on the PCa column 3. Will be done. In this state, as shown in FIG. 7B, when the concrete 42 is press-fitted in the same manner as the construction method shown in the above embodiment, the anchor material 54 is embedded in the concrete 42 in the internal space 3c of the PCa pillar 3. And fixed to the PCa pillar 3.

According to such a configuration, for example, even when the span between columns is long, the bending moment acting on the beam is reliably transmitted to the columns 3 by the anchor material 54 inserted in the internal space 3c of the PCa columns 3. can do. Therefore, it is possible to realize a tough skeleton.

In this first modification, as in the above embodiment, the PCa pillar 3 can be manufactured at low cost, the construction man-hours are reduced, and the concrete 42 is filled by a realistic and easy-to-implement method. Needless to say, it is possible to improve the properties, effectively secure the filling property of the concrete 42, and realize a robust column-beam frame.

(Second variant of the embodiment)
Next, a second modification of the column-beam frame 1 shown in the above embodiment will be described with reference to FIG. FIG. 8 is an explanatory view of the column-beam frame 60 in the second modification. The beam-column frame 60 in the second modification is different from the above-mentioned column-beam frame 1 in that the upper portion of the PCa column 61 is hollowed out to form an internal space 61c, and the bottom surface 61d of the internal space 61c of the PCa column 61 is formed. Is different in that it is located above the erected PCa pillar 61.

According to such a configuration, it is possible to increase the PCa ratio of the PCa column 61 and reduce the hollow portion 61c to the extent that a large heavy load machine or a transport machine is not required. As a result, it is possible to reduce the amount of concrete 42 placed in the hollow portion 61c at the site, and therefore, it is possible to balance the reduction of the construction quantity related to the placement of ready-mixed concrete at the site and the increase in the weight of the PCa column. It is possible.

In this second modification, as in the above embodiment, the PCa pillar 61 can be manufactured at low cost, the construction man-hours are reduced, and the concrete 42 is filled by a method that is realistic and easy to carry out. Needless to say, it is possible to improve the properties, effectively secure the filling property of the concrete 42, and realize a robust column-beam frame.

(Third variant of the embodiment)
Next, a third modified example of the column-beam frame 1 shown as the above embodiment will be described with reference to FIGS. 9 to 12. The construction method in the third modification is different from the construction method in the above embodiment with the second PCa column 70 and the second PCa column 70 on the beam-column joining member 4A (4) installed on the PCa column 3. The difference is that the column-beam joining member 4B (4) of 2 is installed and the internal spaces 3c, 22, 70c, and 22 are filled with concrete.

In the construction method in the third modification, first, as shown in FIG. 9A, the PCa column 3 and the beam-column joint member 4A are installed in the same manner as described in the above embodiment. Next, the second PCa column 70 is installed above the beam-column joining member 4A. The second PCa pillar 70 is different from the PCa pillar 3 shown in FIG. 2 in that it does not have a press-fitting opening for communicating the internal space 70c with the outside, and other than that, it is different from the PCa pillar 3. It has the same configuration. That is, the second PCa pillar 70 has an internal space 70c in which the lower end 70e is opened in addition to the upper end 70b. Therefore, when the second PCa column 70 is installed on the beam-column joining member 4A, the internal space 3c of the PCa column 3, the internal space 22 of the beam-column joining member 4A, and the internal space 22 of the beam-column joining member 4A before the concrete is placed. The internal space 70c of the second PCa pillar 70 communicates with each other.

FIG. 10A shows a side sectional view of the joint portion of the PCa column 3, the beam-column joining member 4A, and the second PCa column 70. At the outer lower end of the second PCa column 70, the lower L-shaped steel 71 is located parallel to the lower end 70e of the second PCa column 70, with the outer surface 71a of one of them facing downward. As such, they are joined. The sealing member 72 is installed so as to be sandwiched between the upper surface 24a of the upper L-shaped steel 24 of the beam-column joining member 4A and the lower surface 71a of the lower L-shaped steel 71 of the second PCa column 70. The position of the inner wall 72a of the sealing member 72 is adjusted so as to be the same as the inner wall 31a of the sealing member 31 described in the above embodiment.

Like the PCa column 3, the second PCa column 70 has a main bar 73 and a mechanical joint 74. That is, the mechanical joint 74 is embedded so that one end surface 74a is exposed from the lower end 70e of the second PCa pillar 70, and the mechanical joint 74 is inserted between the end surface 74a and the other end surface 74b of the mechanical joint 74. The lower end of the main bar 73 is inserted into the internal space 74c formed in the above and fixed. When the second PCa column 70 is installed on the beam-column joining member 4A, the upper end 10a of the main bar 10 of the PCa column 3 is exposed from the lower end 70e of the second PCa column 70 of the mechanical joint 74. It is inserted into the internal space 74c from the end face 74a.

FIG. 10B is an enlarged view of the F arrow viewing portion of FIG. 10A. After inserting the upper end 10a of the main bar 10 of the PCa column 3 into the internal space 74c of the mechanical joint 74, the grout is injected from the grout injection hole 70h provided in the side surface 70g of the second PCa column 70. , The main bar 10 is fixed in the mechanical joint 74.

At this time, for example, when it is necessary to support the lower end 70e of the second PCa pillar 70 with the level adjusting bolt 26 in order to adjust the height position of the second PCa pillar 70, the inside of the mechanical joint 74. The injected grout may flow out from the gap between the inner wall of the space 74c and the outer surface of the main bar 10.
In order to prevent this, the main bar 10 is inserted into the spring 75 and the rubber 76 having a flat ring shape in advance, and the rubber 76 is brought into close contact with the lower surface of the mechanical joint 74 by the elasticity of the spring 75. The outflow of grout can be prevented.

Before the concrete is placed in the internal spaces 3c, 22, and 70c, the second PCa column 70 is not joined to the beam-column joining member 4, but is temporarily placed. Therefore, in order to prevent the misalignment of the second PCa column 70, as shown in FIG. 9B, between the upper surface of the joint member 20 of the beam-column joining member 4A and the outer side surface 70g of the second PCa column 70. Is fixed with a turnbuckle 41 or the like.

Further, as shown in FIG. 11A, the second column-beam joining member 4B is installed on the second PCa column 70. This can be done in the same manner as the installation of the beam-column joining member 4 on the PCa column 3 in the above embodiment. As a result, when the second beam-column joining member 4B is installed, the internal space 3c of the PCa column 3, the internal space 22 of the beam-column joining member 4A, and the second PCa column 70 before the concrete is placed. The internal space 70c and the internal space 22 of the second beam-column joining member 4B communicate with each other.

In this state, as shown in FIG. 11B, the concrete press-fitting pipe 43 is connected to the press-fitting metal 40 of the PCa pillar 3 located at the lowest position, and the concrete 42 is press-fitted from the concrete press-fitting pipe 43 by a pump or the like (not shown). To do. As described above, since the second PCa column 70 does not have a press-fitting opening, that is, a hole communicating with the outside on the side surface 70 g, as shown in FIGS. 12 (a) and 12 (b) in order. The concrete 42 is filled in the internal spaces 70c and 22 of the second PCa column 70 and the second beam-column joining member 4B in addition to the internal spaces 3c and 22 of the PCa column 3 and the beam-column joining member 4A. The pillar.

According to such a construction method, concrete 42 can be placed on PCa columns 3 and 70 on a plurality of layers at a time. Therefore, for example, when constructing a certain layer, the minimum necessary parts such as structurally important parts are required. Only for the pillars of the above-mentioned embodiment, as shown in the above embodiment, concrete is filled in the pillars of the single layer to ensure the strength, and for the other columns of the layer, after the pillars of the upper floor are installed, It is also possible to place concrete at the same time as the pillars on the upper floor. Therefore, it is possible to flexibly formulate a construction plan and effectively reduce the construction man-hours.

In the third modification, the PCa columns 3 and 70 can be manufactured at low cost as in the above embodiment, and the construction man-hours are reduced by a realistic and easy-to-implement method, and the concrete 42. Needless to say, it is possible to improve the filling property of the concrete 42, to effectively secure the filling property of the concrete 42, and to realize a robust column-beam frame. ..

(Fourth modification of the embodiment)
Next, a fourth modification of the column-beam frame 1 shown as the above embodiment will be described with reference to FIG. FIG. 13 is an explanatory view of the column-beam frame 80 in the fourth modified example. The column-beam frame 80 in the fourth modification is different from the above-mentioned column-beam frame 1 in that the end portion of the beam 5 is embedded by the concrete 42 filled by press fitting.

In the beam-column joining member 81 used in this modification, the outer shell body 82 has an extending portion 82a extending outward in the extending direction of the joint member, that is, the extending direction of the beam 5. The extending portion 82a has a beam insertion opening 82b. After installing the beam-column joining member 81 on the erected PCa column 3, as shown in FIG. 13A, the beam 5 is inserted through the beam insertion opening 82b of the column-beam joining member 81. Join to the joint member.

After that, in addition to the internal spaces 3c and 83 of the PCa column 3 and the beam-column joining member 81, the space around the end of the beam 5 located in the extending portion 82a is shown in FIG. 13B. As described above, the concrete 42 is press-fitted and filled.

According to such a construction method, when the end of the beam 5 is made of steel-framed reinforced concrete, the concrete placement of the space 84 around the end of the beam 5 is also the internal space 3c of the PCa column 3 and the beam-column joining member 81. Since it can be performed at the same time as the placement on the 83, it is possible to more effectively reduce the work manpower.

In the fourth modification, as in the above embodiment, the PCa pillar 3 can be manufactured at low cost, the construction man-hours are reduced, and the concrete 42 is filled by a realistic and easy-to-implement method. Needless to say, it is possible to improve the properties, effectively secure the filling property of the concrete 42, and realize a robust column-beam frame.

(Fifth modification of the embodiment)
Next, a fifth modification of the column-beam frame 1 shown as the above embodiment will be described with reference to FIG. FIG. 14 is a perspective view of the beam-column joining member 85 used in the beam-column frame in the fifth modification. The column-beam joint member 85 used in the column-beam frame in the fifth modification is different from the column-beam joint member 4 of the column-beam frame 1 in that it does not have the hoop bar 23 shown in FIG. ing.

The beam-column joint member 85 in this modification does not have a hoop streak, so that the joint member 86 that horizontally penetrates the outer shell body 87 is restrained by the outer shell body 87.
The beam-column frame in this modified example is constructed by the same construction method as in the above-described embodiment, using the column-beam joining member 85 instead of the column-beam joining member 4 used in the above-described embodiment.

According to such a construction method, since the beam-column joining member 85 does not use hoop bars, the filling property of the concrete filled in the internal space 88 of the beam-column joining member 85 is further effectively improved. It becomes possible. Further, since it is not necessary to open a hole for inserting the hoop muscle as in the opening 20a shown in FIG. 3 and it is not necessary to install the hoop muscle itself, the construction can be performed more easily. is there.

In the fifth modification, as in the above embodiment, the PCa pillar 3 can be manufactured at low cost, the construction man-hours are reduced, and the concrete filling property is achieved by a realistic and easy-to-implement method. Needless to say, it has the effect of being able to increase the amount of concrete.

(Sixth modification of the embodiment)
Next, with reference to FIG. 15, a sixth modified example of the column-beam frame 1 shown as the above embodiment will be described. FIG. 15 is an explanatory view of the column-beam frame 90 in the sixth modified example. The beam-column frame 90 in the sixth modification has a point that the outer shell 92 of the beam-column joining member 91 is a steel pipe column and the joint member 93 has an outer shell 92 with the above-mentioned beam-column frame 1. The difference is that it does not penetrate and is joined to the outer surface of the outer shell 92.

Steel plates 95 are joined to the top and bottom of the outer shell 92. The steel plate 95 has a central opening 95a in the center and a main bar insertion opening 95b at a position corresponding to the main bar 10 of the PCa column 3. When the column-beam joining member 91 is installed on the PCa column 3, the main bar 10 of the PCa column 3 inserts each main bar insertion opening 95b of the upper and lower steel plates 95, and the upper end 10a of the main bar 10 is the upper steel plate 95. It is provided so as to be located above.

The beam-column frame 90 in this modified example is constructed by the same construction method as in the above-described embodiment, using the column-beam joining member 91 instead of the column-beam joining member 4 used in the above-described embodiment. At the time of press-fitting concrete, after the internal space 3c of the PCa column 3 is filled with concrete, the inside space 94 of the column-beam joining member 91 is inserted through the central opening 95a of the lower steel plate 95 and the main bar insertion opening 95b. The concrete is filled.

According to such a construction method, since the outer shell 92 of the beam-column joint member 91 functions as a steel pipe column, that is, a structural frame, it is possible to realize a tougher beam-column frame 90. Further, since the joint member 93 does not penetrate the outer shell body 92, it is possible to further effectively improve the filling property of the concrete filled in the internal space 94 of the beam-column joining member 91.

In the sixth modification, the PCa pillar 3 can be manufactured at low cost, as in the above embodiment, and the construction man-hours can be reduced and the concrete filling property can be reduced by a realistic and easy-to-implement method. Needless to say, it has the effect of being able to increase the amount of concrete.

The method of constructing the column-beam frame of the present invention is not limited to the above-described embodiment and each modification described with reference to the drawings, and various other modifications can be considered within the technical scope thereof. ..

For example, in the above-described embodiment and each modification, as shown in FIG. 2, a PCa pillar having a rectangular outer peripheral cross-sectional shape and a circular internal space cross-sectional shape is used, but the present invention is not limited to this. .. For example, the cross-sectional shape of the outer circumference may be another shape such as a circle. Further, the cross-sectional shape of the internal space may have a substantially octagonal shape in which the corners of the rectangle are dropped in an oblique direction, as in the internal space 101 of the PCa pillar 100 shown in FIG. It may be in the shape of.

Further, in the above-described embodiment and each modification, the outer shell of the beam-column joint member is a steel plate or a steel pipe column, but instead of this, the outer shell is manufactured as a formwork from wood, plastic, or the like. , The formwork may be removed after filling by press fitting of concrete.

Further, in the above-described embodiment and each modification, the sealing member 31 is interposed between the PCa column and the beam-column joint member, but instead, the outer periphery of the joint portion between the PCa column and the beam-column joint member is formed. By covering the joint portion with a sealing member from the outside so as to surround the joint portion, the outflow of the press-fitted concrete may be prevented.
Further, after the press-fitted concrete is hardened, the sealing member 31 and the sealing member may be removed.

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

1 Column-beam structure 3 Precast concrete (PCa) column 3a Column head 3b Upper end 3c Internal space 3d Press-fitting opening 3e Lower end 3g Side surface 4 Column-beam joining member 5 Beam 20 Joint member 21 Outer shell 22 Internal space 31 Sealing member 40 Press-fit metal 42 Concrete 43 Concrete press-in pipe 51 Column-beam joint member 52 Joint member 53 Outer shell 54 Anchor material 61 Precast concrete (PCa) column 61c Internal space 70 Second precast concrete (PCa) column 70b Upper end 70c Internal space 70g Side 72 Sealing member 80 Column-beam frame 81 Column-beam joining member 82 Outer shell body 82a Extension 82b Beam insertion opening 83 Internal space 84 Around the end of the beam 85 Column-beam joining member 86 Joint member 87 Outer shell body 88 Inside Space 90 Column-beam frame 91 Column-beam joint member 92 Outer shell 93 Joint member 94 Internal space

Claims (4)

This is a method of constructing a beam-column structure using precast concrete columns, in which beams are joined to the capitals of erected precast concrete columns using column-beam joining members.
The precast concrete column has an internal space at which the upper end opens, and a press-fitting opening for communicating the internal space with the outside is provided near the lower end of the internal space on the side surface of the precast concrete column. Ori
The beam-column joining member has an outer shell having an internal space in which the upper end and the lower end are open, and a beam joining joint that is horizontally connected to the outer shell and projects outward from the outer shell. Equipped with parts,
To erection the precast concrete pillar,
To install the beam-column joining member on the precast concrete column so that the internal spaces of both the precast concrete column and the beam-column joining member communicate with each other.
To fill the internal spaces of both the precast concrete column and the beam-column joint member by press-fitting concrete through the press-fitting opening of the precast concrete column.
Enclosure erected said precast concrete pillars and the periphery of the opening of the beam-column joint member, placing the sealing member sandwiched vertically between the beam-column joint member and the precast concrete pillars, only contains ,
The structure of the sealing member sandwiched in the vertical direction is such that the sealing member is sandwiched between the L-shaped steel joined to the precast concrete column and the L-shaped steel joined to the column-beam joining member. ,
Construction method of column-beam frame using precast concrete columns. The joint member penetrates the outer shell in the horizontal direction.
An anchor material extending downward is fixed to the lower surface of the portion of the joint member located inside the outer shell body.
The precast concrete column according to claim 1 is used as the anchor material, which is inserted into the internal space of the precast concrete column when the beam-column joining member is installed on the precast concrete column. Construction method of column beam frame. Before filling the concrete
To install a second precast concrete column having an internal space that opens not only the upper end but also the lower end on the installed beam-column joint member.
Installing the second beam-column joint member on the second precast concrete column,
Including
In the press-fitting of the concrete, in addition to the internal spaces of the precast concrete column and the beam-column joining member, the concrete is also applied to each internal space of the second precast concrete column and the second beam-column joining member. A method for constructing a beam-column structure using the precast concrete column according to claim 1 or 2, which is to be filled. The outer shell has an extension portion extending outward in the extending direction of the joint member, and the extension portion has a beam insertion opening.
Prior to filling the concrete, the beam is joined to the joint member by inserting the beam insertion opening of the column-beam joining member.
Including
From claim 1, in the press-fitting of the concrete, the concrete is filled not only in each internal space of the precast concrete column and the beam-column joining member, but also around the end of the beam located in the extension portion. A method for constructing a beam-column structure using the precast concrete column according to any one of 3.

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