JPH05148898A - Joint structure of prestressed concrete beam and column structure - Google Patents

Abstract

PURPOSE:To simplify the detailing around a fixing section to a column of PC steel materials in the case a prestressed concrete beam to be prestressed is joined with the column and to save man-power in field work. CONSTITUTION:PC steel materials 3 are arranged to the inside of a joining section, prestress is introduced to join a prestressed concrete beam 1 to be prestressed with a column 2, and the column is formed of a steel pipe concrete structure. The PC steel materials 3 arranged to the inside of the concrete beam 1 are fixed to the ends of a concrete 11, and the concrete beam 1 and the column 2 are joined by connecting brackets 4 buried into the ends of the concrete beam 1 to diaphragms 5 arranged to the inside of the column 2. According to the structure, the arrangement to the joining section of the PC steel materials 3 is not required, and construction of the joining section is simplified to save man-power in the field work.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a prestressed concrete beam-column joint structure in which a prestressed concrete beam precast is joined to a column.

[0002]

Since the prestressed concrete beam with the PC steel material arranged on the tension side has high yield strength and rigidity, it enables a large span and, at the same time, has less vibration disturbance than steel beams. Although it has an advantage, when the beam is precast for the purpose of labor saving on site work, it is fixed to the joint between the column and the beam, the PC steel material fixed to the end of the beam and the column, and the beam is fixed. While the PC steel materials to be joined to the columns are mixed, the columns are usually made of reinforced concrete or steel-framed reinforced concrete, so the PC steel materials for joining are sewn between the main bars and shear reinforcement bars. Therefore, the structure of the joint becomes complicated, and especially when the column is made of steel-framed reinforced concrete, the presence of the column steel frame tends to make it difficult to engage with the PC steel.

The present invention was made by paying attention to the problem of the connection with columns when using precast prestressed concrete beams, and is intended to newly propose a joint structure which simplifies the structure. ..

[0004]

According to the present invention, a PC steel material placed in a concrete beam is fixed to an end face of concrete, and a concrete beam and a column are embedded in an end portion of a diaphragm and a concrete beam placed in the column. By connecting and joining these brackets, it is not necessary to place PC steel in the joint, and the structure of the joint is simplified to save on-site work.

Further, by using a steel pipe concrete column having high toughness and toughness against bending moment and vertical load from a long-span prestressed concrete beam for the column, the reinforcement of the interior of the column is omitted, and the structure of the joint is further improved. To simplify. The diaphragm is at the position of the concrete beam of the pillar,
It is arranged so as to project to that side.

[0006] A concrete beam is manufactured by arranging a PC steel material on the tension side, introducing prestress into this, and precasting it, and the end portion of the PC steel material being fixed to the end surface of the concrete. The bracket is embedded in the end of the concrete beam, and the end is exposed from the end surface of the concrete.

Since the PC steel material is fixed to the end face of the concrete beam without penetrating the column, the structure of the joint portion in the column is simplified, and at the same time, the concrete beam and column are joined to each other between the steel frame beam and the steel frame column. It is performed in the manner of joining, and the work is labor-saving because the work of connecting the bracket and the diaphragm is not required, and the work of arranging the PC steel material and the tension work is not required on site.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing an embodiment.

According to the present invention, as shown in FIG. 3, a PC steel material 3 is placed inside, and a precast concrete beam 1 into which a prestress is introduced is precast, and a concrete beam 1 is used.
The bracket 4 embedded in the inside and the diaphragm 5 arranged in the pillar 2 are connected and joined.

The concrete beam 1 is shown in FIG.
As shown in FIGS. 5 and 6 which are cross-sectional views taken along the line Y-Z and the line Z-Z, in addition to the main bar 6 and the stirrup 7, the tension side is provided over the entire length.
PC steel material 3 is placed, and its end is concrete 1 ₁
It is fixed on the end face of. PC steel 3 is concrete beam 1
It is arranged at the upper and lower positions at the end of. The PC steel material 3 is tensioned during manufacture of the concrete beam 1 is fixed to a fixing plate 8 which is arranged on the end face of the concrete 1 _1.

At the end of the concrete beam 1, a bracket 4 connected to the pillar 2 is embedded, and the end thereof is made of concrete 1 _{1 as} shown in FIG. 3 and FIG. 4 which is a sectional view taken along the line XX. Is exposed to the pillar 2 side from the end surface of the PC steel material, that is, the fixing portion of the PC steel material 3.

[0012] Bracket 4 3, is welded main reinforcement 6 of the upper and lower ends to the upper and lower flanges, as shown in FIG. 5, the tensile force from the main reinforcement 6 is embedded in the concrete 1 in ₁ in a state to be transmitted. Crest of the bracket 4 is continuous with the top end face of the concrete 1 ₁ than convenience when slabs or floor shuttering installed as shown in FIG.

[0013] Column 2 concrete consists of steel pipe concrete structure filled into the steel pipe 2 _1, the diaphragm 5 is disposed in its position of concrete beam 1, that is, the position of the upper and lower flanges of the bracket 4.

[0014] periphery of the diaphragm 5 is projected to the outer peripheral side than the steel pipe 2 ₁ of the flange, the bracket 4 is connected to the protruding portion.

FIG. 1 shows the case where the bracket 4 is butted against the diaphragm 5 and welded, and FIG. 2 shows the diaphragm 5.
Weld the flange plates 9, 9 to the bracket 4 side of
This is a case where the upper and lower flanges of the bracket 4 are butted against the flange plates 9 and 9, the joint plate 10 is passed between the two, and they are joined by bolts 11.

A gusset plate 12 for transmitting the shearing force from the web of the bracket 4 is projected from the flange of the pillar 2, and in the case of the embodiment shown in FIG. 1, this gusset plate is provided.
12 and the web of the bracket 4 are joined by bolts 11. In the case of the embodiment shown in FIG. 2, the gusset plate 12 is projected at the same position as the web of the bracket 4 in section.
A joint plate (10) is laid between this and the web, and both are joined by bolts (11).

[0017]

As described above, the present invention is as described above, in which the PC steel material placed in the concrete beam is fixed to the end face of the concrete, and the concrete beam and the column are fixed to the diaphragm and the end portion of the concrete beam placed in the column. Since the brackets embedded in are connected and joined, it is not necessary to dispose the PC steel material at the joints in the columns, and the structure of the joints can be simplified.

As a result, since the work of joining the concrete beam and the pillar is only welding or bolt joining at the site, the site work can be greatly saved.

[Brief description of drawings]

FIG. 1 is an elevation view showing a joint portion between a concrete beam and a column when a bracket is welded to a diaphragm.

FIG. 2 is an elevation view showing a joint portion between a concrete beam and a pillar when the bracket is bolted to the diaphragm.

FIG. 3 is a vertical sectional view showing an example of manufacturing a concrete beam.

4 is a sectional view taken along line XX of FIG.

5 is a cross-sectional view taken along the line YY of FIG.

FIG. 6 is a sectional view taken along line ZZ in FIG.

[Explanation of symbols]

1 …… Concrete beam, 1 ₁ …… Concrete, 2 ……
Pillars, 2 ₁ …… Steel pipes, 3 …… PC steel materials, 4 …… Brackets, 5
...... Diaphragm, 6 ... Main line, 7 ... Stirrup,
8 ... Fusing plate, 9 ... Flange plate, 10 ...
Joint plate, 11 …… Bolt, 12 …… Gusset plate.

Claims (1)

[Claims] 1. A joint structure of a concrete beam and a column in which a PC steel material is placed inside and prestressed and is precast, and the column is made of a steel pipe concrete structure in which concrete is filled inside the steel pipe. The diaphragm is placed at the position of the concrete beam so as to project toward that side, and the bracket is attached to the end of the concrete beam, the end of which is exposed from the end face of the concrete to the pillar side, and the end of the PC steel material is buried. The part is anchored to the end face of concrete, and the concrete beam has a bracket connected to the diaphragm and joined to the column, which is a joint structure between the prestressed concrete beam and the column.