JPH066818B2 - Reinforced steel composite column - Google Patents

Description

TECHNICAL FIELD The present invention relates to a reinforced steel composite column used when constructing a multi-layer building in which a column is a reinforced concrete structure and a beam is a steel frame.

"Conventional technology" Conventionally, as the frame of a building, pillars are reinforced concrete,
A reinforced steel composite structure having a beam as a steel structure is known.
According to this, the construction cost is less expensive than the case where the whole building is made of steel frame, and the construction period can be shortened compared to the case where the whole structure is made of reinforced concrete structure. Can be built.

When constructing a building with such a reinforced steel composite structure, the columns are made up of column main bars and hoop bars that have been assembled in advance to a length corresponding to the floor height of the building.
Is generally used. To construct a multi-story building using this pillar rebar cage, first build a pillar rebar cage of the length corresponding to the floor height of that floor on the bottom floor, and then between the rebar cages. Along with bridging the steel beams, the formwork is assembled on the outside of the rebar cage and concrete is poured. Then, after this concrete hardens, a reinforcing bar cage is added to the floor immediately above it, and thereafter, the above procedure is repeated to build a building for each floor in order toward the upper layer.

"Problems to be solved by the invention" However, in order to construct a building by using a reinforcing bar cage for pillars having a length corresponding to the floor height of each floor as described above, constructing a building by constructing a building It was necessary to perform heavy work and work to reinforce the reinforced baskets on each floor, and it took time and labor, but despite the beams being made of steel, it was impossible to expect a significant reduction in the construction period. .

In addition, an effective means for attaching the steel beam to the steel cage has not been established yet, and in this respect as well, it takes time and effort for the construction and there is concern about the structural strength.

The present invention has been made in view of the above circumstances, in constructing a building of a reinforced steel frame composite structure, the construction period can be sufficiently shortened, and the structural strength can be sufficiently ensured. It is intended to provide pillars.

"Means for Solving the Problems" The reinforced steel composite column of the present invention is a multi-story steel beam for a multi-story column rebar cage configured by a plurality of column main bars and hoop bars over a plurality of floor lengths. A joint structure for joining is attached at a predetermined interval, and the joint structure is a beam that surrounds a beam steel frame portion formed by integrating beam steel frames in an intersecting state and an intersection portion of the beam steel frame portion. A cylindrical formwork / plate plate unit integrated with a steel frame part, and a plurality of pillar main bars of the steel cage pass through the inside of the formwork / plate plate part of the joint structure, and At least a part of a plurality of pillar main bars is fixed to a mounting flange formed so as to extend inward on an inner wall of the form / plate plate portion.

[Operation] In the present invention, concrete is placed inside and around the reinforced cage to form reinforced concrete columns on a plurality of floors.
Further, the beam steel frame portion of the joint structure fixed to the rebar cage is joined to the steel frame beam bridged between the columns, and acts as an end portion of the beam. Furthermore, the formwork / plate part of the joint structure serves as a pillar formwork of the joint part, and also serves to reinforce the panel zone (column / beam intersection) integrally with the steel frame beam. , Will form a rigid connection between the pillar and the beam.

[Examples] Examples of the present invention will be described below with reference to the drawings.

1 to 6 are views showing a reinforced steel frame composite column which is an embodiment of the present invention. This composite pillar A has three layers (3
It is used when constructing a building having a (story) ramen structure, and is roughly configured by a reinforced basket 1 and a joint structure 2, 2, 2.

The rebar cage 1 includes a plurality of (12 in the illustrated example) column main bars 3,
It is a pre-assembled rebar preassembled by 3, ... and hoop reinforcements 4, 4, ... to a length corresponding to the height of three layers of a building. Of the main columnar bars 3, 3, ..., The main columnar bars 3a, 3a, ... Positioned at the corners thereof and the main columnar bars 3b, 3b ,.

.. are attached to the rebar cage 1. Reinforcing bar beams of a building are joined to the joint structure bodies 2, 2, ... As described later, and the joint structure body 2 attached to the uppermost portion of the rebar cage 1 in FIG. Is a beam on the uppermost floor, and the beams on the third floor and the second floor are attached to the connection forming bodies 2 and 2 attached to the middle portion, respectively.

As shown in FIG. 2 and FIG.
A beam steel frame portion 5 in which an H-shaped steel frame composed of an upper horizontal plate 5a (upper flange), a lower horizontal plate 5b (lower flange), and a vertical plate 5c (web) intersects in a cross shape and is integrated, and the beam steel frame. It is composed of form plate / plate portions 6, 6, ... Integrally attached to the beam steel frame portion 5 so as to surround the intersecting portion of the portion 5. The upper end and the lower end of the frame / plate portion 6 are slightly extended from the upper horizontal plate 5a and the lower horizontal plate 5b of the beam steel frame portion 5 in the longitudinal direction of the column main bars 3, 3, .... . Here, the upper end of the form / plate plate portion 6 of the joint structure 2 attached to the position corresponding to the uppermost floor is
As will be described later, it is formed so as to be flush with the upper horizontal plate 5a of the beam steel frame portion 5 because of the connection with the floor slab. .., that is, the corners of the box body formed by joining the mold / plate plates 6, 6, ... To the upper and lower ends thereof. , Are attached to the mounting flanges 7 extending inward of the box body. The mounting flange 7 is formed with an insertion hole 8 which penetrates the mounting flange 7 in the thickness direction. Further, air holes 9 are formed in the upper and lower horizontal plates 5a and 5b at positions corresponding to the central portions of the intersecting portions of the beam steel frame portions 5, respectively.

As described above, the joint structure constructed as described above is attached at predetermined intervals in the length direction of the rebar cage 1, that is, at a position corresponding to the floor height of the building. The fixing of the joint structure 2 to the rebar cage 1 is performed by inserting the through holes 8 of the mounting flanges 7, 7, ... , 8 ... are inserted with the column main bars 3a, 3a, ... at the corners of the rebar cage 1, and the nuts 11 are screwed and tightened from above and below (see FIG. 4). In addition, when a threaded joint bar is not used as the column main bars 3a, 3a, this portion may be fixed by welding or the like. At this time, the column main bar 3b in the middle part,
The parts 3b, ... pass through the joint structure 2 through the space formed by the beam steel frame part 5 and the plate part 6 serving also as the formwork. With the above configuration, the rebar cage 1
The column main bars 3, 3, ... Are located inside the formwork / plate portion 6 of the joint structure 2 (see FIGS. 2 and 3).

Further, sleeve joints 12 (see FIG. 1) are attached to the lower ends of the column main bars 3 of the rebar cage 1, respectively. Further, inside the column main reinforcements 3, 3, ... Of the rebar cage 1, frame-shaped buckling prevention frames 14, 14, ... Supporting the column main reinforcements 3, 3 ,. ), Rebar cage 1
Are attached at a predetermined interval in the length direction.

Next, a method of using the reinforced steel frame composite column A having the above configuration will be described with reference to FIG.

First, the composite pillar A is lifted by a crane or the like, and the lower end of the composite pillar A is erected in a basket-like rebar 15, 15,
By connecting to the sleeve joint 12 ...
Each of these composite pillars A is built in a predetermined position. Next, a beam 16 on the second floor is bridged between the joint structure bodies 2 and 2 at the bottom of the composite columns A and A, which are built adjacent to each other, and the ends of the beam 16 and the joint structure body. The end of the H-shaped steel frame of the beam steel frame part 2 of 2 is joined by welding or bolts. Then, a column form (not shown) is attached around the reinforced cage 1 on the first floor (the part under the beam), and concrete is placed inside this.
After the concrete is hardened, the columns and beams of this building are constructed by repeating the same procedure on the upper floors. As for the floor slab and the wall, any appropriate means generally used in the past may be used. Fig. 7 shows the intermediate floor (2nd floor,
It is a figure which shows the detail of the connection structure 2 part of the (3rd floor). Further, FIG. 8 is a view showing details of the uppermost floor (top floor) of the joint structure 2 portion after concrete is similarly cast and the slab 17 on the rooftop floor is further cast.

As described above, by using this composite pillar A, it is possible to build pillars for three layers at once, as in the case of building a steel frame pillar, and it is possible to significantly reduce the construction period. Here, the main pillar 3 of the composite pillar A is the hoop muscle 4,
.. and the buckling prevention frames 14, 14, ... Are supported from outside and inside, so that the composite column A will not buckle during assembly.

Further, the connection between the beam 16 and the connection forming bodies 2 and 2 can be performed in the same manner as in the case of the conventional steel frame structure, and the beam steel frame portion 5 of the connection forming body 2 is connected to the beam 16 to this. After being done,
The load that acts as an end portion of the beam 16 and thus acts on the beam 16 is transmitted to the composite column A through the beam steel portion 5. In particular, the rebar cage 1 and the joint structure 2 are composed of pillar main bars 3a,
, 3a, ... Are inserted into the insertion holes 8 of the mounting flange 7 and fixed, and the form / plate portion 6 is integrated with each other by restraining the concrete cast therein, It will be joined sufficiently rigidly.

Further, the plate / combined plate portions 6, 6, ... Of the joint structure 2.
In addition to acting as a formwork for the joint part, which was difficult to construct in the conventional reinforced concrete construction, the column concrete of the joint part is restrained by the formwork / plate parts 6, 6 to provide a confined effect. With the reinforcement effect by
The steel frame portion 5 (that is, the end portion of the beam 16) also has a role of a stiffener. Further, since the air holes 9, 9 formed in the upper and lower horizontal plates 5a, 5b serve as air outlets inside the pillar formwork and inside the formwork / plate part 6 when concrete is poured. Concrete can be filled into every corner inside the column form and the form / plate plate 6.

The composite pillar A, which is one embodiment of the present invention, has been described above, but the present invention is not limited to the above-mentioned embodiment and various applications are possible. For example, the composite pillar A in the above embodiment is
Although the structure is applied to a three-story building, the pillar main bar 3 is also applicable to a two-story, four-story, or multi-story building.
Can be sufficiently coped with by simply changing the length, the number of the joint structures 2 and the mounting interval to the rebar cage 1. Also,
In the composite pillar A, the beam steel frame portions 5 of the joint structure 2 are crossed in a cross shape and the beams 16 are joined from four directions. However, in the case of a pillar contacting an outer wall In this case, the beam steel frame portions 5 may intersect in a T-shape so that the beams 16 are joined in three directions. Of course, in the case of a pillar provided at a corner of a building, the beams 16 are joined in two directions in an L-shape, or in two directions in a straight line, or in only one direction depending on the need of a frame form. Such a configuration may be used. Further, the shape of the beam steel frame portion 5 of the joint structure 2 is changed even when the beam forming dimensions of the beams 16 to be joined are different from each other or when the levels of the beams 16 are differently attached to the columns. It is possible to deal only with that.

Moreover, the shape of the plate / cumulative plate portion 6 is not limited to the above-described embodiment, and for example, the positions of the upper end and the lower end of the plate portion 6 are the upper and lower horizontal plates 5a, 5a of the beam steel frame portion 5, respectively.
It may be flush with b. Furthermore, the method of fixing the column main bar 3 and the joint structure 2 and the shape of the reinforcing bar are not limited to those in this embodiment, and may be appropriately selected from known means and shapes.

Further, in the composite pillar A, the beam on the top floor is also the joint structure 2
However, in the case where the uppermost floor beam is pin-joined to the pillar, the uppermost floor connection structure 2 may be omitted. FIG. 9 is a view showing a state in which the uppermost beam 18 is pin-joined to the composite column A of this embodiment.
In FIG. 9, the upper ends of the column main bars 3 (3a, 3b) of the rebar cage 1 are fixed to the fixing plate 19 via nuts 20, and the beam 18 includes anchor bolts 21 and nuts 22.
Is connected and fixed to the top of the pillar.

The procedure for constructing a building using the composite pillar A may be freely selected from the conventional construction methods. For example, a reinforced concrete beam, a reinforced concrete beam, or a precast concrete beam is used instead of the steel beam. The walls and floor may also be reinforced concrete or precast concrete. The pillars may also be precast concrete. Furthermore, the order of placing concrete may be appropriately selected depending on the construction conditions.

In order to manufacture the composite pillar A, an appropriate gantry is provided on a flat work site such as a site or a factory, and the joint structures 2 are placed on the gantry at predetermined intervals. It suffices to insert and fix the column main bars 3, 3, ....

Further, as another embodiment, although not particularly shown, the pillar main bars 3a and 3b may be fixed to the edge portion of the flange 5a of the beam steel frame portion 5.

[Advantages of the Invention] As described in detail above, according to the present invention, since the connector structure is attached to the rebar cage over the length of a plurality of floors, it is possible to build the pillars of a plurality of floors at once. At the same time, the beams can be easily joined, and therefore the construction period can be greatly shortened when constructing a building having a reinforced steel frame composite structure.

In addition, since the column main bar is fixed to the formwork / plate portion of the joint structure, the column and the beam can be joined in a sufficiently rigid state, so that the structural strength of the building can be sufficiently secured. .

In addition, since at least a part of the plurality of column main bars is fixed to a mounting flange formed to extend inwardly on the inner wall of the form-combined plate portion, the column main bar is also used. The plate and the column main bar inserted through the inside of the plate can be easily and firmly fixed via the mounting flange, and the mounting flange is formed on the inner wall of the form / plate so as to extend therefrom. Another advantage is that it is possible to increase the rigidity of the plate that also serves as the formwork in which concrete is placed.

Further, since the mold plate serving also as the mold is provided in the joint structure, the column mold of the joint is not necessary, and therefore the labor of the mold work can be saved. In addition, since the concrete column in the joint is reinforced by the confined effect, it is possible to secure a highly reliable structure that is structurally well-balanced and can exert its proof stress sufficiently.

[Brief description of drawings]

FIG. 1 is a diagram showing a reinforced steel frame composite column which is an embodiment of the present invention, a front view showing the overall schematic configuration thereof, and FIG. 2 is an enlarged perspective view showing the vicinity of the joint structure. FIG. 3 is a plan view of the same, FIG. 4 is an enlarged front view showing a fixed state of the plate / combined plate portion and the column main bar in the same embodiment, and FIG. 5 is a plan view showing a mounted state of the buckling prevention frame. Sectional drawing, FIG. 6 is a view for explaining a method of using the same embodiment, and is a front view showing a state in which a beam is attached to an upright composite pillar, and FIG. 7 is an intermediate floor after placing concrete. Fig. 8 is a plan sectional view showing a joint structure portion of Fig. 8, Fig. 8 is a plan sectional view showing the joint structure portion of the same top floor, and Fig. 9 is a plan sectional view showing a state in which the top floor beam is pin-joined. It is a figure. A: Reinforced steel composite column, 1 ... Reinforced cage, 2 ... Joint structure, 3 ... Column main bar, 4 ... Hoop bar, 5 ... Beam steel frame,
6 ... Plate part that also serves as a formwork.

Claims (1)

[Claims] 1. A joint structure for joining a plurality of stories of a steel beam is attached at a predetermined interval to a reinforcement bar cage for a column constituted by a plurality of pillar main reinforcements and hoop reinforcements over a plurality of floor lengths. The above-mentioned joint structure is a tubular formwork / plate which is integrated with the beam steel frame part by surrounding the intersection part of the beam steel frame part and the beam steel frame part which are configured by integrating the beam steel frames in an intersecting state. And a plurality of column main bars of the reinforcing bar cage pass through the inside of the form and plate section of the joint structure, and at least a part of the plurality of column main bars has a plurality of column main bars. A reinforced steel frame composite column, characterized in that it is fixed to a mounting flange formed to extend inwardly on the inner wall of the formwork / plate portion.