JP2740475B2 - Joint structure of beam and column - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure between a beam and a column.

[0002]

2. Description of the Related Art As shown in FIG. 3, a prestressed concrete structure constructed by combining prestressed concrete members is provided on a beam receiving jaw 22 of a plurality of precast concrete columns 21 erected on a foundation 20, and at an end thereof. A precast concrete beam 24 is spanned between the columns with the projection 23 supported, and the precast concrete beam 24 is prestressed with a PC steel wire 25 to be constructed.

As shown in FIG. 3, the beam 24 and the column 21 in this prestressed concrete structure are joined together with a mortar 26 interposed therebetween.

[0004]

However, this prestressed concrete structure has a problem that a beam receiving jaw at a joint between a beam and a column is damaged by a vertical force caused by a so-called direct earthquake.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a beam receiving jaw at a joint between a beam and a column of a prestressed concrete structure, which is a vertical beam caused by a so-called direct earthquake. The goal is to prevent damage by force.

[0006]

Means for solving the above problems are to provide a precast concrete girder in which a plurality of precast concrete columns are provided on a foundation, and a plurality of precast concrete columns are supported by beam receiving jaws. In the beam-to-column joint structure in which the precast concrete girders are prestressed with PC steel wires and tension-fixed to the precast concrete columns, the beam receiving jaws and the ends of the precast concrete beams are provided. the junction of the protrusion parts, Rutotomoni the impact cushioning material is interposed in a range not exceeding the length of the projection, from the precast concrete column and a precast concrete beam to the other joints, except the shock absorbing material A low-strength mortar, and the shock-absorbing material is a hard rubber plate, a lead plate or a combination of a lead plate and a hard rubber plate Is that wherein there.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a sectional view showing a joint between a precast concrete column and a precast concrete beam.

A precast concrete column 1 is joined to a pedestal block 2 by a PC steel bar 3 and is erected on a foundation concrete 4. This precast concrete column 1
Is prestressed with a PC steel rod 3 or a PC steel wire 5 in advance, and a beam receiving jaw 6 is integrally formed at a predetermined height.

A projection 8 at the end of the precast concrete beam 7 is supported on the beam receiving jaw 6, and the precast concrete beam 7 is stretched between the columns.

An upper PC steel wire 5a and a lower PC steel wire 5b are buried in the upper and lower portions in the longitudinal direction of the precast concrete beam 7 in advance. The end of the upper PC steel wire 5a penetrates the precast concrete column 1 from the protrusion 8 of the precast concrete beam 7 and the end of the lower PC steel wire 5b penetrates the precast concrete column 1 from the jaw 6 for receiving a beam, thereby giving a predetermined muscle tension. As a result, the precast concrete beams 7 are prestressed and joined.

The joint between the precast concrete beam 7 and the precast concrete column 1 has an impact buffer 9
Is provided. The shock absorbing member 9 is hard rubber, et al provided in a range not exceeding the length of the projection 8 of the precast concrete beam 7 Rutotomoni, the impact cushioning material
The remaining joints are filled with mortar 10 having lower strength than the precast concrete beam 7 and the precast concrete column 1.

Thus, the precast concrete beam 7
And the precast concrete column 1 are formed in a state where the shock absorbing material 9 is sandwiched between the upper PC steel wire 5a and the lower PC steel wire 5b. Absorbs external force.

As shown in FIG. 2, the shock absorbing material 9 may be formed by laminating a hard rubber plate 11 and a lead plate 12, as shown in FIG. In addition, the shock buffer 9 can be formed of a lead plate or a resin mortar, or can be formed by combining them.

As described above, by joining the precast concrete beam 7 and the precast concrete column 1 with the shock buffer 9 interposed therebetween, the shock buffer 9 absorbs a vertical force caused by a so-called direct type large earthquake or the like. To prevent damage to the beam receiving jaws 6 of the precast concrete column 1.

[0015]

The prestressed concrete structure is
When a vertical force due to a so-called direct earthquake is received, the vertical force is absorbed by the shock absorbing material at the joint between the beam and the column, so that the beam receiving jaw can be prevented from being damaged.

By forming the shock absorbing material by combining a resin mortar, a lead plate, and a lead plate and a hard rubber plate, an external force such as a vertical force can be effectively absorbed.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a joint between a precast concrete column and a precast concrete beam.

FIG. 2 is a cross-sectional view of the shock absorbing material.

FIG. 3 is a cross-sectional view showing a joint between a conventional precast concrete column and a precast concrete beam.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Precast concrete column 2 Pedestal block 3 PC steel rod 4 Foundation concrete 5 PC steel wire 6 Beam receiving jaw 7 Precast concrete beam 8 Projection 9 Impact buffer 10 Mortar 11 Hard rubber plate 12 Lead plate

Claims (1)

(57) [Claims] 1. A plurality of precast concrete pillars erected on a foundation are supported by beam receiving jaws, and end projections are supported, and a precast concrete girder is bridged between the pillars.
In the beam-column joint structure in which these precast concrete girders are prestressed with PC steel wires and tensioned and fixed to the precast concrete columns, the joint between the beam receiving jaw and the protrusion of the end of the precast concrete beam is In addition, an impact buffer is interposed within a range not exceeding the length of the protrusion , and a mortar having a lower strength than the precast concrete columns and the precast concrete beams is interposed at other joints except the impact buffer . A joint structure between a beam and a column, characterized in that: