JP2554535B2 - Steel beam / reinforced concrete column composite construction method - Google Patents

Description

[Detailed Description of the Invention] [Industrial application] The present invention relates to a steel beam / reinforced concrete column composite construction method (hereinafter referred to as RCSS construction method) in which a beam is made of steel and a column is made of reinforced concrete to form a rigid frame. In particular, the present invention relates to an RCSS construction method that uses steel core columns to ensure accuracy stability during erection, and has been expanded so that it can be adapted to the dimensional changes of columns in the upper and lower floors, similar to the RC structure.

"Conventional technology" RCSS construction method is a construction method in which the columns are made of RC (reinforced concrete) and the beams are made of S (steel frame) to form a ramen.
In this construction method, the column main bars are pre-processed at the same time as the beam joints at the factory and erected on site, as in the case of steel frames, and both the short construction period of steel frame construction and the low cost of reinforced concrete construction are used. It has advantages and is suitable for building large-scale stores, offices, and factories.

In addition, recent research results confirm that the RCSS columns have the same yield strength as when the column main bars are directly joined to the beam flange without using the lock nut to stitch the beam to the beam flange. There is.

[Problems to be Solved by the Invention] However, the conventional RCSS construction method as described above has the following problems to be solved.

Since the pillars are only RC baskets, the stability during construction is poor, and the frame is not stable unless the main beams are fully tightened and the deck plate is attached.

As shown in FIG. 4, a part of the column main bar is not a normal deformed bar 1 but a threaded bar 2 and the threaded bar 2 needs to be sewn to the upper and lower ends of the beam flange of the girder 3. The position of the main bar is constrained in a plane, and it is not possible to perform ordinary RC cross-section design that changes the column cross section depending on the floor,
Therefore, there is no choice but to design with extremely poor cross-sectional efficiency.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an RCSS construction method in which stability during erection is poor and it is not necessary to sew a column main bar to a girder.

"Means for Solving the Problem" This invention is a steel frame beam / reinforced concrete column composite construction method in which a beam is made of steel and a column is made of reinforced concrete to form a rigid frame, and the column has the steel beam at the time of erection. Incorporating a steel core column as a hypothetical support member for supporting, a flat steel plate is attached to each of the upper and lower ends of the steel core column, and the steel core column is attached to the lower end of the steel plate. The steel frame is made self-sustaining by tightly adhering to the upper flange of the steel frame that becomes the beam, and the lower flange of the steel frame that becomes the beam of the upper floor is closely contacting and fastening to the steel plate attached to the upper end of the steel core column. Are supported by the steel core column, and the steel frame and the steel core column to be the beams are erected, after which the reinforcing bars are arranged around the steel core column and concrete is placed. By doing so, a column made of reinforced concrete is formed in a state where the steel core column is buried.

"Operation" In the construction method of the present invention, a steel reinforced concrete pillar is incorporated into a reinforced concrete pillar as a hypothetical supporting member that serves as a core of the pillar and supports a steel beam during erection. A steel material such as a steel pipe to which a flat steel plate is attached in advance is used. Then, the steel plates above and below the steel core columns are closely adhered and fastened to the flanges of the steel beams of the upper and lower floors, respectively, in order to perform those erections in a form of supporting the steel beams by the steel core columns, Since the stability of the building is high and there is no need to sew the main reinforcement of the column to the steel beam, it is possible to change the section of the column up and down as easily as when constructing a normal RC column. You can Then, after erection in this way, the concrete pillar is poured to bury the steel core pillar and the RC pillar having the steel core pillar as the core is executed. Since it is not necessary to stitch the main reinforcement to the beam flange, the position of the main reinforcement of the column is not constrained in a plane. Therefore, the main reinforcement of the column can be freely arranged at a desired position and at the time of placing concrete. The vertical load of concrete can be supported by the steel core column.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

The RCSS construction method using the steel core column of this example
In the RCSS method of constructing a rigid frame with a steel structure and a beam, as shown in FIGS. 1 and 2, the steel core column 4 serving as the core of the column is preliminarily self-supported and its upper and lower ends are respectively the upper and lower floors. The erection is performed by engaging with the beam flange 3a of the large beam 3 (steel beam).

As shown in FIG. 3, the steel-framed core column 4 has square steel plates 6 having bolt holes 5 at four corners at both ends of a steel pipe having a length corresponding to the floor height of a building to be constructed. By attaching the bolt holes 5 of the steel plates 6 to the steel plates 6, the steel plates 6 are attached to the girders 3 respectively.
The beam flange 3a (that is, the upper flange of the lower beam and the lower flange of the upper beam) is fastened and joined in a state of being in close contact with each other.

In this RCSS construction method, by constructing as described above, it is possible to enhance stability during construction. Then, after constructing in this way, when constructing an RC column with the steel core column 4 as the core, the column main bar 1 (normal The deformed rebar) is arranged, and then the formwork is arranged up and down along the bristle plate 7, and the concrete 8 is placed in the formwork to support the vertical load of the concrete 8 on the steel core column 4. In this state, the concrete 8 is hardened to form a column. When the columns and beams are constructed in this way, the column main bars 1 are connected to the beam flanges of the girders 3.
Since it is not necessary to stitch to the 3a, the position of the column main bar 1 is not constrained in a plane, and therefore the column main bar 1 can be freely arranged at a desired position, which facilitates the cross section of the column in the upper and lower floors. Can be changed to.

"Effects of the invention" As described above, the steel beam-reinforced concrete composite construction method of the present invention is to incorporate steel core columns into the columns of reinforced concrete structure, and the flat steel plates attached to the upper and lower ends of the steel core columns. Since the steel core column and the beam steel frame are erected by closely adhering to the flanges of the upper and lower beam steel, and then the column rebars are reinforced, concrete placement is performed. It is possible to exert an effect.

It can be self-supported by steel core pillars as well as steel pillars during erection, and can improve the accuracy stability of erection without increasing the cost. The vertical load of the concrete can be supported by the steel core column.

It is not necessary to sew the column main bars to the steel beam. Therefore, it is not necessary to use expensive screw rebars, only ordinary rebars need to be used, and there is no need to make a through hole for connecting the screw rebars at the column main bar position of the beam flange, which reduces the yield strength of the beam. Nothing.

A sleeve joint is not required when joining column rebars, and ordinary pressure welding joints can be used for joining.

Changing the cross section of the column between the upper and lower floors can be done as easily as building a normal RC column.

Since the flat plate-shaped steel plates attached to the upper and lower ends of the steel core pillar are closely attached to the beam flanges and fastened, a sufficient supporting area and fastening strength can be secured, and highly accurate and stable construction can be performed.

[Brief description of drawings]

1 to 3 are views showing an embodiment of the present invention, in which FIG. 1 is a plan view of a joint portion constructed by an RCSS construction method using a steel core column, and FIG. The front view and FIG. 3 are external views of the end portion of the steel core column. FIG. 4 is a plan view of a joint section constructed by a conventional RCSS construction method. 1 …… Column main bar (normal deformed bar), 2 …… Column main bar (screw bar), 3 …… Large beam, 3a …… Beam flange, 4 …… Steel core column, 5 …… Bolt hole, 6 …… Steel plate , 7 ... Fusagi board, 8 ... Concrete.

Claims (1)

(57) [Claims] 1. A composite structure of a steel frame beam and a reinforced concrete column, wherein a beam is made of steel and a column is made of reinforced concrete to form a rigid frame, and the column is a hypothetical support member for supporting the steel beam at the time of erection. As a steel core pillar, the steel core pillar is attached to the upper and lower ends of the steel core pillar, and the steel core pillar is attached to the lower end of the steel core pillar as an upper flange of the steel frame to be a beam. The steel frame is supported by the steel-framed core column by making the steel frame attached to the upper end of the steel-framed core column intimately contact with the steel plate attached to the upper end of the steel-framed column column, and by closely fastening the lower flange of the steel frame to be the beam of the upper floor Then, the steel frame and the steel core column to be the beams are erected, and thereafter, by arranging the reinforcing bars around the steel frame core column and placing concrete, the steel frame core Steel beam-reinforced concrete columns composite construction method and forming a reinforced concrete pillar in the state that killed fill the.