JPH1061005A - Method and unit for connecting column and beam made of reinforced concrete - Google Patents

Abstract

PROBLEM TO BE SOLVED: To rationalize the bar arrangement of beam main reinforcement in a column and beam connection part and improve structure performance of the connection part. SOLUTION: Beam main reinforcement 3 constituted of twisted reinforcement is inserted in each vertical frame piece 2 of a rectangular frame type column and beam connection part shear reinforcement band steel plate 1 in the form of an ornamental hair pin, a column and beam connection unit P tightened through nuts 4 is set on the head part of a column A. A reinforced concrete- made large beam B is mounted on the head part of the column A, and the main reinforcement of the beam lower end of the large beam B is jointed to the beam main reinforcement 3 composed of the twisted reinforcement.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for joining columns and beams with improved structural performance at the joint between reinforced concrete columns and beams, and a column / beam joining unit used in the joining method. .

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 7, a joint portion between a reinforced concrete column A and a beam B is a through bar for a beam main bar a, and the outer periphery of a column main bar b is reinforced by a shear reinforcing bar c, or as shown in FIG. As shown in the figure, the main bar a ′ at the lower end of the beam was bent and fixed, the upper bar was a through bar a, and the outer periphery of the column main bar b was reinforced by a shear reinforcing bar c.

[0003]

However, in the case shown in FIG. 7, it is difficult to join the main bars when precasting the girders or pre-assembling the reinforcing bars. When high-strength bars are used for the main beams of the girder, the bond length for securing the bond performance is insufficient. In addition, in the case shown in FIG. 8, the lower main bars of the opposing girders from both directions at the stigma are intricate, and it is difficult to secure the main bar interval. Therefore, the beam width may have to be increased. In addition, when casting concrete at the column / beam joint, there is a case where a problem occurs in the concrete filling property at the lower part of the main reinforcement.

As a common problem in FIGS. 7 and 8, the workability of the arrangement of the shear reinforcing bars at the column / beam joint, particularly at the lower part of the joint, is poor. The present invention has been proposed in view of the problems of the prior art described above, and has as its object the purpose of streamlining the reinforcement of the main beam in a reinforced concrete column-beam joint, and improving the performance of the column-beam joint. To provide an improved reinforced concrete column / beam joining method and joining unit.

[0005]

In order to achieve the above-mentioned object, according to the reinforced concrete column / beam joining method according to the present invention, a beam reinforcing steel sheet is surrounded by a strip steel plate for shear reinforcement surrounding the column reinforcement. A beam and beam joint unit inserted into the column is installed on the column capital where the beam structure is cut off, and is joined to the beam main reinforcing bars arranged between the columns.

According to a second aspect of the present invention, a U-shaped hollow PC beam having a reinforced concrete beam frame with a slab thickness cut off and a main bar at the lower end of the beam buried is mounted between columns, and the beam structure is cut off. The column and beam joining unit is disposed on the formed column cap, and the upper beam end main reinforcement or the lower beam end main reinforcement is overlapped and joined. According to the method of claim 3, a beam reinforcing bar arranged on a reinforced concrete beam formed between the columns is pre-assembled, and the pre-assembled beam reinforcing bar is erected between the columns, and the beam reinforces the column capital where the beam formation is cut off. The column and beam joining unit is provided, and the crossed reinforcing bar of the unit is overlapped and joined to the beam upper main bar or the beam lower main bar of the pre-assembled beam reinforcing bar.

According to a fourth aspect of the present invention, there is provided a column-beam joining unit for a reinforced concrete structure, wherein a through-hole for penetrating the beam reinforcing bar is formed in a steel plate for shear reinforcement surrounding the column bar, and the through-hole is formed in the through-hole. Insert the threaded reinforcing bar and screw it in through the nuts screwed inward and outward across the strip steel plate,
It is tightly constructed.

[0008]

Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a column / beam joint unit P, in which a beam main bar insertion hole is formed in each side vertical frame 2 of a steel plate 1 for shear reinforcement surrounding a column main bar 8. Beam main reinforcements 3 composed of threaded reinforcing bars are penetrated into the respective insertion holes in a pin shape, and nuts 4 are screwed and tightened into the beam main reinforcements 3 on both the inner and outer surfaces of the strip steel plate 1.

The column / beam unit P configured as described above
Is installed at the column head of the reinforced concrete column A at the column-beam joint, and a U-shaped PC giant beam B with a partially cut beam is mounted on the column head. At the time of construction, a column A without a beam is erected, a hollow PC large beam B is erected, a column / beam joint unit P is set at the column head, and a deck plate for slab molding or a slab dam composed of a half PC plate is used. Board 9
Is installed, and the main reinforcement 7 at the upper end of the beam is arranged, and the slab reinforcement 10a is provided.
And slab concrete 10 is poured.
(See FIG. 4.) In the figure, 5 is a main bar at the lower end of the beam which is driven into the PC beam G, 6 is a rib bar partially projecting from the beam frame, 7 is a main bar at the upper end of the beam, and 8 is a main bar of the column. 11 is concrete, 1
2 indicates a floor.

FIG. 5 shows another embodiment, in which the beam rebar employs a construction method based on the pre-assembly method, and the beam lower main bar 5a, the beam upper main bar 7a, and the rib bar 6a are previously provided between the columns A. Assembling the beam rebar T thus constructed, erection the beam rebar T pre-assembled between the reinforced concrete column A at the column / beam joint, and the column cap where the column is the column cap and the beam is cut off. Column and beam joint units P are arranged above and below, and the beam bottom reinforcing bar 5a of the pre-assembled beam rebar T and the threaded bar 3 that is arranged in the lower part of the column and beam joint units P arranged in the lower part. , And the beam joining unit P threaded reinforcing bar 3a similarly arranged on the upper portion and the beam upper main bar 7a are joined. The upper and lower joints are lap joints.

Thereafter, a beam form and a slab form (including a deck plate for a slab form and a half-PC board) are assembled, reinforcing bars 10a are arranged on the slab, and concrete 11 is integrated with the column / beam joint. It is cast and built. FIG. 6 is a cross-sectional view taken along the arrow of FIG. 5 in which a beam B 'and a floor 12 are formed.
In addition, depending on the diameter and the number of reinforcing bars, the bridge-shaped beam main reinforcement 3 of the column / beam joint unit of the present invention is designed so that the beam upper main reinforcement 7a or the beam lower main reinforcement 5 is arranged in both directions or in a unidirectional or multi-stage arrangement. This can be coped with by increasing the width of the vertical piece 2 of the column / beam joining unit P.

[0012]

As described above, according to the present invention, a beam reinforcing bar composed of a screw bar is inserted into each vertical frame piece of a steel plate for shearing reinforcement at a joint portion, and tightened via a nut to tighten the column. The beam joint unit is constructed, the column / beam joint unit is installed on the capital, and the beam reinforcement of the girders mounted on the capital is joined to the thread reinforcing bar in the column / beam joint unit, thereby forming a beam reinforcement. Shear reinforcement and integrated beam
, Unitization of rebar (pre-assembly) is planned,
It is possible to simplify the work of arranging bars at the column / beam joint.

[0013] Further, transmitting the stress acting on the main beam to the steel plate via the nut which tightens the screw-rebar to the column / beam joint unit, and transmitting the force applied to the steel plate to the main beam via the nut. This reinforces the column / beam joint. According to the invention of claim 2, a U-shaped hollow PC beam having a slab thickness cut off and a lower main bar buried is mounted between the columns, and the column and the beam are cut off at the column head where the beam structure is cut off. The beam / joining unit is provided, and the column and the beam are integrated by overlapping and joining with the upper or lower beam main reinforcement, and the slab is further integrally cast.

According to a third aspect of the present invention, a beam reinforcement for arranging a reinforcing bar on a reinforced concrete beam formed between columns is pre-assembled, and the pre-assembled beam rebar is erected between the columns, and the beam capital is cut off. The beam / column joint unit is disposed on the column, and the crossed reinforcing bar of the unit is overlapped with the beam upper main bar or the beam lower main bar of the pre-assembled beam reinforcing bar, and crossed to the column via the column / beam connecting unit. Beam in each direction can be effectively joined.

According to a fourth aspect of the present invention, a threaded reinforcing bar is inserted into each steel piece of the strip steel plate for shear reinforcement, and a nut threaded inside and outside the steel piece of the threaded reinforcing steel bar. Then, it is screwed and tightened to each of the steel pieces so that the column / beam joining method can be smoothly performed.

[Brief description of the drawings]

FIG. 1 is a perspective view of a column / beam joining unit.

Fig. 2 Columns applied to reinforced concrete PC girders
It is sectional drawing which shows a beam joining part.

FIG. 3 is a plan view of FIG. 2;

FIG. 4 is a view taken along the arrow in FIG. 3;

[Fig. 5]
It is sectional drawing which shows a beam joining part.

FIG. 6 is a cross-sectional view taken along the arrow in FIG.

FIG. 7 is a longitudinal sectional view showing an example of a conventional method.

FIG. 8 is a longitudinal sectional view showing another example of the conventional method.

[Explanation of symbols]

 A Reinforced concrete column B PC girder B 'Reinforced concrete girder P Column / beam joint unit 1 Column / beam joint shear reinforcement band steel plate 2 Vertical frame piece 3 Beam main bar 3a Beam main bar 4 Nut 5 Beam lower main bar 5a Beam lower main bar 6 Rib 6a Rib 7 Main beam upper bar 7a Main beam upper bar 8 Column main bar 9 Slab dam 10 Slab concrete 10a Slab reinforcement 11 Concrete 12 Floor

Claims (4)

[Claims] 1. A steel plate for shear reinforcement surrounding a column bar,
Pillars and beam joint units that penetrate the beam rebar in a pin shape
A method for joining columns and beams in reinforced concrete construction, wherein the method is installed on a column capital where a beam is not formed, and is joined to a beam main reinforcing bar arranged between columns. 2. A U-shaped hollow PC in which a reinforced concrete beam frame has a slab thickness cut off and a main bar at a lower end of the beam is buried.
A beam is placed between the columns, and the column,
A method for joining columns and beams in reinforced concrete construction, comprising disposing a beam joining unit and overlapping and joining an upper beam end main reinforcement or a lower beam end main reinforcement. 3. A pre-assembled beam reinforcing bar arranged on a reinforced concrete beam formed between columns, and the pre-assembled beam reinforcing bar is erected between the columns. A method for joining columns and beams in a reinforced concrete structure, comprising: arranging a beam joining unit, and overlapping and joining a crossed reinforcing bar of the unit with a beam upper main bar or a beam lower main bar of the pre-assembled beam reinforcing bar. 4. A steel plate for shear reinforcement surrounding a column bar is provided with an insertion hole through which a beam reinforcing bar is penetrated, and a screw bar is inserted into the through hole to sandwich the steel plate plate. A column in a reinforced concrete structure, which is screwed through a nut screwed inward and outward, and tightened.
Beam joining unit.