JPH1046663A - Joint structure between post and beam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to withstand a large earthquake with a vertical shock by firmly anchoring a PC post and a PC beam with PC steel wires and providing a trough hole which runs over the PC poles and the PC beam, in a joining area and filling up grout therein so that they may be fixed. SOLUTION: Precast reinforced concrete beams 2 (hereafter called PC beams) are provided between a plurality of precast reinforced concrete posts 1 (hereafter called PC posts) erected on a foundation 4. A joining end section is supported on a beam receiving jaw 3 where a prestress is provided to a PC steel wire 6 so that the end section may be fasteningly anchored. A through hole is provided in the joining area over the PC post 1 and the PC beam 2. Joining reinforcing wires 7 comprising a plurality of PC steel strand wires are inserted into the through hole where grout is filled up and fixed. It is, therefore, possible to withstand a short time vertical upward force from below created by a huge earthquake with a vertical shock to a satisfactory extent by joining the structure as described above.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a joint structure between a column and a beam.

[0002]

2. Description of the Related Art In general, in a building made of precast concrete members, as shown in FIG. 13, a precast concrete beam 22 bridged between precast concrete columns 21 erected at appropriate intervals is made of PC steel. Tension was established at line 23.

In such a joint structure between a beam and a column, when the beam receiving jaw 24 is formed integrally with the column, the beam receiving jaw 24 receives a vertical load, but the beam receiving jaw 24 is not provided. In the case, the vertical load was received by frictional resistance.

[0004]

However, in the beam-column joint structure as described above, a long-term vertical load can be received by a beam receiving jaw or frictional resistance, but occurs once every several years. It was not able to withstand the short-term force from below to above due to a large earthquake called a direct-type earthquake.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a short-term upward-to-downward earthquake caused by a large earthquake called a direct earthquake that occurs once every several years. It is an object of the present invention to provide a joint structure between a column and a beam which can sufficiently withstand a large force.

[0006]

Means for achieving the above object are to provide a plurality of precast concrete columns extending from a joint end of a precast concrete beam erected between a plurality of precast concrete columns erected at appropriate intervals. Is provided with a joining reinforcing wire made of PC steel stranded wire.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a joint structure between a column and a beam will be described below in detail with reference to the drawings. FIG. 1 is a front view showing a joint structure between a column and a beam, FIG. 2 is a sectional view of the same, FIG.
FIG.

As shown in FIG. 1, a precast reinforced concrete beam (hereinafter simply referred to as PC beam) 2 is erected between a plurality of precast reinforced concrete columns (hereinafter simply referred to as PC columns) 1 erected on a foundation concrete 4. The joint end is supported by a beam receiving jaw 3. PC pillar 1
Is prestressed with a PC steel rod 5 or a PC steel wire, and the PC beam 2 is prestressed with a PC steel wire 6 and joined thereto.

At the joint between the PC beam 2 and the PC column 1, a joint reinforcing wire 7 is provided, and as shown in FIGS.
When the PC beam 2 is joined in four directions of the column 1, the joining reinforcing lines 7 are provided from one beam end to the other beam end via the PC column 1.

On the other hand, when the PC beam 2 is joined in one direction or two directions as shown in FIG. 4, a joint reinforcing line 7 is provided from the PC beam 2 to the PC column 1.

The joint reinforcing wire 7 is inserted into a through hole 8 extending between the PC beam 2 and the PC column 1 and is fixed by a grout 9 filled therein. Therefore, the joint reinforcing wire 7 sufficiently resists a force from below to above due to a large earthquake called a direct type that occurs once every several years.

A joint reinforcing wire 7 is provided around the injection pipe 10.
PC steel strands 11 are formed by binding in binding bands 12, and grout filling holes 13 are formed in the peripheral surface of the injection pipe 10.
Is open. Therefore, when grout 9 is injected into the injection pipe 10 of the joining reinforcing wire 7 inserted into the through hole 8, the grout 9 is filled into the through hole 8 from the grout filling hole 13. The number of the PC steel strands 11 is not limited to eight, but may be more or less.

FIG. 7 shows an example in which the connection reinforcing wire 7 is provided by being curved upward. As in the case where the connection reinforcing wire 7 is provided by being curved downward as described above, a force from below to above can be applied. It can fully resist.

FIGS. 8 and 9 show an example in which the connection reinforcing wires 7 are crossed. FIG. 8 shows an example in which connection reinforcing lines curved upward or downward are crossed. Is a crossover of the connection reinforcing wires arranged diagonally. All of these can sufficiently resist not only a downward force but also a top-down force.

FIG. 10 shows the connection reinforcing wire 7 connected to the PC steel wire 11.
In this case, as shown in FIG. 11, both ends of the PC steel stranded wire 11 are wedge 1
4 is fixed to the anchor head 15.

FIG. 12 shows a joint structure between the column 1 and the beam 2 having no beam receiving jaw 3 as described above. The structure is the same as that described above except that the beam receiving jaw 3 is not provided. It is.

[0017]

According to the present invention, a plurality of PC steel stranded wires are provided from the joint end of a precast concrete beam erected between a number of precast concrete columns erected at appropriate intervals to the precast concrete columns. Therefore, the joint between the column and the beam can be held safely because it can sufficiently resist a short-term upward force from a large earthquake called a direct type that occurs once every several years.

Since the joint reinforcing wire is curved downward or upward, it can sufficiently resist a force acting from bottom to top or a force acting from top to bottom due to a large earthquake.

Since a plurality of joining reinforcing wires are provided so as to intersect with each other, they can sufficiently resist even a force from below to above.

Since the precast concrete beam is tensioned and fixed to the precast concrete column with a PC steel wire, it can be applied to a joint between a prestressed concrete column and beam.

The resistance at the joint between the column and the beam can be increased by the tension of the joint reinforcing wire.

Since the precast concrete columns and the precast concrete beams are made of prestressed reinforced concrete, they can be applied to prestressed reinforced concrete buildings.

Since the beam-receiving jaws are integrally formed on the precast concrete column in advance, it is possible to sufficiently resist not only a vertical load from top to bottom but also a force from bottom to top.

[Brief description of the drawings]

FIG. 1 is a front view showing a joint structure between a column and a beam.

FIG. 2 is a cross-sectional view of a joint structure between a column and a beam.

FIG. 3 is a plan view of a joint structure between a column and a beam.

FIG. 4 is a sectional view of a joint structure between a column and a beam.

FIG. 5 is a perspective view of a joining reinforcement line.

FIG. 6 is a cross-sectional view of a joining reinforcing wire, and FIG.
FIG. 4 is a sectional view taken along line AA of FIG.

FIG. 7 is a front view showing a joint structure between a pillar and a beam in which a joint reinforcing line is curved upward.

FIG. 8 is a front view showing a joint structure of a column and a beam where joining reinforcement lines curved up and down intersect.

FIG. 9 is a front view showing a joint structure of a column and a beam where diagonal joining reinforcing lines intersect.

FIG. 10 is a cross-sectional view of a joint structure between a column and a beam.

FIG. 11 is a perspective view showing the fixing of the end of the joining reinforcing wire.

FIG. 12 is a front view showing a joint structure between a column and a beam without a beam receiving jaw.

FIG. 13 is a front view of a conventional joint structure between a column and a beam.

[Explanation of symbols]

 1,21 PC column 2,22 PC beam 3,24 Jaw for beam receiving 4 Base concrete 5 PC steel rod 6,23 PC steel wire 7 Joint reinforcement wire 8 Through hole 9 Grout 10 Injection pipe 11 PC steel stranded wire 12 13 Grout filling hole

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location E04G 21/12 104 E04G 21/12 104D

Claims (7)

[Claims] 1. A connecting reinforcement line made of a plurality of PC steel strands is provided from a joint end of a precast concrete beam erected between a number of precast concrete columns erected at appropriate intervals to the precast concrete column. A joint structure between a column and a beam characterized by the following. 2. The joint structure between a column and a beam according to claim 1, wherein the joint reinforcing line is curved downward or upward. 3. The joint structure between a column and a beam according to claim 1, wherein a plurality of the joint reinforcing lines are provided to intersect. 4. The joint structure between a column and a beam according to claim 1, wherein the joint reinforcing wire is tensioned. 5. The joint structure between a column and a beam according to claim 1, wherein the precast concrete beam is tension-fixed to a prestressed concrete column with a PC steel wire. . 6. The precast concrete column and the precast concrete beam are prestressed reinforced concrete structures.
4. A joint structure between a column and a beam according to any one of items 4 and 5. 7. The joint between a column and a beam according to claim 1, wherein a beam receiving jaw is integrally formed on the precast concrete column in advance. Construction.