JP3676702B2 - Joint structure of precast concrete columns - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a joint structure of precast concrete columns.
[0002]
[Prior art]
As shown in FIG. 4, the precast concrete column was erected on the foundation 14 via the base block 13, and the PC steel material 16 in the foundation 14 and the precast concrete column 15 was joined by the coupler 17.
[0003]
[Problems to be solved by the invention]
However, the joint structure of precast concrete columns as described above is rigidly connected to the foundations of the precast concrete columns. Therefore, the joints between the precast concrete columns and the pedestal blocks are subjected to column base bending stress due to the horizontal force of a huge earthquake. There was a problem that a large number of cracks occurred in the part.
[0004]
The present invention has been made in view of the problems as described above, and its purpose is to provide a joint between a precast concrete column and a pedestal block even when subjected to column base bending stress due to the horizontal force of a huge earthquake. It is to provide a joint structure of precast concrete columns that does not crack.
[0005]
[Means for Solving the Problems]
The invention of claim 1 for solving the above-mentioned problems is that a precast concrete column body is erected on a foundation with a curved structure, and the precast concrete column body is made of a PC steel material joined to a foundation PC steel material. Stress is applied, and the curved surface structure is a sphere provided on the lower surface of the precast concrete column main body, a receiving seat on a foundation on which the sphere is fitted, and the periphery of the receiving seat and the sphere are filled. It consists of joint material with weak strength . In the invention of claim 2, the precast concrete column main body erected on the foundation via the pedestal is given a predetermined prestress by the PC steel material joined to the PC steel material of the foundation. A curved surface structure is formed between the spheres provided on the lower surface of the precast concrete column body, a receiving seat on the foundation on which the sphere is fitted, and the periphery of the receiving seat and the sphere, It is characterized by comprising a joint material having a lower strength than these .
[0006]
When subjected to a large horizontal force due to an earthquake, the precast concrete column main body joined to the foundation with a curved structure rotates to break the joint material, thereby preventing damage such as cracks. By destroying the joint material having the same or weak strength, it is possible to prevent the precast concrete column main body, the pedestal block, and the foundation from being destroyed. By exchanging only the joint materials that have been destroyed, it is possible to easily repair the joint structure of the precast concrete columns.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a precast concrete column joining structure (hereinafter referred to as a PC column joining structure) according to the present invention will be described.
[0008]
FIG. 1 shows a PC column joint structure 1 according to the first embodiment, and a precast concrete column body (hereinafter referred to as a PC column body) 5 is erected on a pedestal block 4 installed on a foundation 3 with a curved surface structure 2. The PC column main body 5 and the foundation 3 are joined by a PC steel material 6.
[0009]
The curved surface structure 2 is such that a cast iron sphere 7 in the pedestal block 4 is rotatably fitted to a cast iron receiving seat 8 in the foundation, and a mortar having weaker strength than these is provided around the spherical body 7 and the receiving seat 8. The joint material 9 such as is filled. Therefore, when the PC column main body 5 receives bending stress due to the horizontal force of the earthquake, it can be prevented from being cracked by rotating on the curved surface structure 2 and destroying the joint material 9. Therefore, it is possible to simplify the repair of the PC pillar joint structure 1 by replacing only the broken joint material 9.
[0010]
The PC steel material 6 is a PC steel rod, a PC steel wire, or a PC steel wire. The PC steel material 6 in the foundation 3 and the PC column main body 5 is joined by a coupler 10 and given a predetermined prestress.
[0011]
FIG. 3 shows a PC pillar joining structure 12 according to the second embodiment. The PC pillar body 5 is erected on the foundation 3 without the base block 4, and the curved surface structure 2 is provided therebetween. Other than that, the configuration is the same as the bonding structure 1 of the first embodiment, and the same effects are obtained.
[0012]
In addition to the curved surface structure 2 described above, the PC column main body 5 can be rotatably pin-joined, and the periphery thereof can be filled with a joint material 9 such as mortar having a lower strength than the PC column main body 5 (not shown). ) In this case as well, damage such as cracking can be prevented by rotating the PC pillar body 5 by the horizontal force of the earthquake and destroying the joint material 9.
[0013]
【The invention's effect】
When receiving a large horizontal force due to an earthquake, the PC pillar body joined to the foundation with a curved structure rotates to break the joint material, thereby preventing the occurrence of cracks and the like.
[0014]
By destroying the joint material having low strength, it is possible to prevent the PC pillar body, the base block, the foundation, and the like from being destroyed.
[0015]
The repair of the joint structure of the PC pillar can be easily performed by replacing only the joint material that has been destroyed.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a joint structure of PC pillars according to a first embodiment.
FIG. 2 is a cross-sectional view taken along line AA in FIG.
FIG. 3 is a cross-sectional view of a joint structure of PC pillars according to a second embodiment.
FIG. 4 is a cross-sectional view of a conventional joining structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1,12 Connection structure 2 of PC pillar Curved structure 3,14 Base 4,13 Base block 5,15 PC pillar main body 6,16 PC steel material 7 Sphere 8 Receptacle 9 Joint material 10,17 Coupler

Claims (2)

The precast concrete column main body is erected on the foundation with a curved structure, and the precast concrete column main body is given a predetermined prestress by the PC steel material joined to the PC steel material of the foundation, and the curved structure is a lower surface of the precast concrete column main body. A precast concrete comprising: a sphere provided on a base, a receiving seat on a foundation into which the sphere is fitted, and a joint material having a lower strength than the base and filled around the receiving seat and the sphere. Column connection structure. The precast concrete pillar body erected on the foundation via the pedestal is given a predetermined prestress with the PC steel material joined to the foundation PC steel material, and a curved surface structure is formed between the pedestal and the foundation, The curved surface structure includes a sphere provided on the lower surface of the precast concrete column main body, a receiving seat on a foundation on which the sphere is fitted, and a joint material having a lower strength than those filled in the periphery of the receiving seat and the sphere. junction structure of precast concrete pillars, characterized in that it consists of a.

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