Patent Application
20250092708
The present disclosure relates generally to a seismic-resistant joint structure of a PC column and a PC beam using a steel bracket. More particularly, the present disclosure relates to a seismic-resistant joint structure of a PC column and a PC beam using a steel bracket, in which a steel bracket is installed on a PC column by protruding therefrom to mount a PC beam to the PC column so that the PC column and the PC beam are simply joined by using a bolt fastening method, thereby reducing construction and finishing work while preventing accidents to shorten a construction period, and enabling the implementation of the performance of an intermediate moment frame or higher.
Since RC construction is carried out as wet construction, problems of construction delays occur and the risk of accidents increases due to high frequency of high-altitude work. Therefore, the use of precast concrete (PC) construction method has been increasing in recent years to secure constructability and reduce construction time.
Although this type of PC method somewhat reduces construction time when simply mounting a PC beam on a PC column, there were problems such as the PC beam, which is simply mounted on the PC column, falling due to external impact.
A technology that serves as the background of the present disclosure includes Korean Patent No. 10-2223854 “POST-CONSTRUCTED PC BALCONY” (Patent Document 1).
The background technology relates to “a post-constructed PC balcony that is constructed later separately from the main body of a building and protrudes on an outer wall 1 of the building, wherein the post-constructed PC balcony includes a U-shaped PC beam frame 2 composed of a pair of vertical beams 2a fixed to the outer wall 1 of the building and a transverse beam 2b connecting outer end parts of the vertical beams 2a to each other; bottom panels 3 mounted inside the PC beam frame 2; and cast-in-place concrete 4 poured on top of the bottom panels 3, wherein a corbel member 11 composed of a mounting plate 111 mounted on the outer wall 1 of the building and having a front surface thereof exposed to the outside and a mounting part 112 attached to the front surface of the mounting plate 111 is provided to protrude on the outer wall 1 of the building on which each of the vertical beams 2a is located; a coupling shoe 22 mounted on the mounting part 112 of the corbel member 11 is provided to be embedded in the inner end part of the vertical beam 2a; a pocket part 23 is formed on the upper portion of the inner end part of the vertical beam 2a; a fixed plate 24 is fixedly coupled to an end part of the front side of the pocket part 23; and an insert 12 is embedded in the outer wall 1 of the building at a position corresponding to the fixed plate 24, so that the fixed plate 24 is fixed to the outer wall 1 of the building by a tensile bolt 25 that penetrates the fixed plate 24 from the pocket part 23 and is fastened to the insert 12”.
However, the background technology faces the problem that it is difficult to reduce the weight of the PC balcony, which does not alleviate a lifting burden, and the structure of a joint is complicated.
Document of Related Art: Patent Document 1) Korean Patent No. 10-2223854 “POST-CONSTRUCTED PC BALCONY”.
Accordingly, the present disclosure has been made keeping in mind the above problems occurring in the related art, and the present disclosure is intended to propose a seismic-resistant joint structure of a PC column and a PC beam, in which a PC column and a PC beam are simply joined in a bolt fastening method by mounting the PC beam to the PC column, thereby reducing construction and finishing work while preventing accidents to shorten a construction period, and enabling the implementation of the performance of an intermediate moment frame or higher.
In order to achieve the objectives of the present disclosure, there is provided a seismic-resistant joint structure of a PC column and a PC beam using a steel bracket, wherein the PC column includes a steel bracket composed of a pair of side plates having shapes of vertical plates and being spaced apart from each other by a predetermined distance, a coupling plate having a shape of a vertical plate and connecting end parts of the pair of side plates to each other, with the coupling plate having a seating part cut to have a predetermined width from an upper part thereof downward to a predetermined height, and a seating plate, which has a shape of a horizontal plate, having a longitudinal end part connected to an upper end part of the coupling plate, opposite widthwise end parts connecting upper end parts of the pair of side plates to each other, and a guide part formed by being cut at a position corresponding to the seating part so that the coupling plate protrudes outward from the PC column, and the PC beam includes a step part recessed from a lower surface of an end part of the PC beam connected to the PC column upward to a predetermined height, and a lower reinforcement bar arranged in an inner lower part of the PC beam, wherein an end part of the lower reinforcement bar is exposed a predetermined length from the step part and the exposed part is threaded, so the step part is mounted on the upper part of the steel bracket, and the lower reinforcement bar of the PC beam is seated on the seating part through the guide part of the steel bracket to be fastened by a nut at each of opposite sides of the coupling plate.
In addition, the step part may be formed by recessing a widthwise central part of the end part of the PC beam.
In addition, a shim plate may be provided on an upper part of the seating plate to absorb a vertical installation error.
In addition, a shim plate may be provided on a joint surface of the PC column and the PC beam on the upper part of the steel bracket to absorb a horizontal installation error.
In addition, in the coupling plate and the seating plate, the seating part and the guide part may respectively include two seating parts or more spaced apart from each other by a predetermined distance and two guide parts or more spaced apart from each other by a predetermined distance, and in a lower portion of the seating plate, a reinforcement plate with a shape of a vertical plate may be formed between the guide part and the guide part to connect the seating plate with the coupling plate.
In addition, an interior of the steel bracket and space between the steel bracket and the step part of the PC beam may be filled with non-shrinkage mortar so that the PC beam and the steel bracket are integrated with each other.
In addition, a coupler may be embedded in a portion above a position at which the steel bracket is installed in the PC column so that a first end part of the coupler is exposed, and after an upper reinforcement bar is arranged in an upper part of the PC beam so that a second end part of the upper reinforcement bar is coupled to the coupler after the PC beam is coupled to the steel bracket of the PC column, concrete may be poured in the upper part of the PC beam.
According to the seismic-resistant joint structure of a PC column and a PC beam using a steel bracket of the present disclosure, the steel bracket is installed on the PC column by protruding therefrom to mount the PC beam to the PC column so that the PC column and the PC beam are simply joined by using a bolt fastening method, thereby reducing construction and finishing work while preventing accidents to shorten a construction period, and enabling the implementation of the performance of an intermediate moment frame or higher.
The following drawings attached in this specification illustrate an exemplary embodiment of the present disclosure and, together with the detailed description of the present disclosure, serve to help further understanding of the technical idea of the present disclosure, and thus, the present disclosure should not be interpreted as being limited to matters described in the attached drawings.
The above and other objectives, features, and other advantages of the present disclosure will be more clearly understood from the following detailed description when taken in conjunction with the accompanying drawings, in which:
Hereinafter, the present disclosure will be described in detail with reference to an embodiment presented in the attached drawings, but the presented embodiment is illustrative for a clear understanding of the present disclosure and the present disclosure is not limited thereto.
Hereinafter, the technical configuration of the present disclosure will be described in detail according to an exemplary embodiment.
In the joint structure of a PC column 10 and a PC beam 20 of the present disclosure, a steel bracket 30 is installed on the PC column 10 by protruding therefrom, the PC beam 20 is mounted on the steel bracket 30, and the PC column 10 and the PC beam 20 are joined by a bolt fastening method by using nuts 360.
To this end, the steel bracket 30 is configured to be embedded in the PC column 10, and a portion of the steel bracket 30 exposed from the PC column 10 is formed as follows.
The steel bracket 30 includes a pair of side plates 310 having the shapes of vertical plates and being spaced apart from each other by a predetermined distance, a coupling plate 320 having the shape of a vertical plate and connecting end parts of the pair of side plates 310 to each other, and a seating plate 330 having the shape of a horizontal plate, wherein a longitudinal end part of the seating plate 330 is connected to the upper end part of the coupling plate 320 and opposite widthwise end parts of the seating plate 330 connect the upper end parts of the pair of side plates 310 to each other, so the steel bracket 30 is embedded at a height at which the PC beam 20 is joined thereto so that the coupling plate 320 protrudes outward from the PC column 10.
In this case, the coupling plate 320 is cut to have a predetermined width from an upper end part thereof downward to a predetermined height to form a seating part 321, and when mounting the end part of the PC beam 20, an exposed part of each of lower reinforcement bars 230 embedded in the PC beam 20 is moved downward from the upper part of the seating part 321 to be mounted.
In addition, the seating plate 330, which is formed in the shape of a horizontal plate, includes a guide part 331 formed by being cut at a position corresponding to the seating part 321 so that the exposed part of the lower reinforcement bar 230 embedded in the PC beam 20 penetrates the seating plate 330 when mounting the end part of the PC beam 20.
Particularly, the seating part 321 and the guide part 331 of the coupling plate 320 and the seating plate 330 may respectively include one seating part and one guide part but, as illustrated, may include two seating parts and two guide parts, with two seating parts spaced apart from each other by a predetermined distance and two guide parts spaced apart from each other by a predetermined distance, and may include at least two seating parts and at least two guide parts as required.
When the seating part 321 and the guide part 331 include a plurality of seating parts and a plurality of guide parts, the seating parts 321 and the guide parts 331 are preferably configured to be spaced apart from each other at equal intervals, and in the lower portion of the seating plate 330, a reinforcement plate 340 with a shape of a vertical plate is formed between the guide part 331 and the guide part 331 to connect the seating plate 330 with the coupling plate 320 for reinforcement.
The end part of the PC beam 20 is seated on and connected to the steel bracket 30 of the PC column 10 configured in this manner. To this end, the PC beam 20 includes a step part 210 recessed from the lower surface of an end part of the PC beam 20 connected to the PC column 10 upward to a predetermined height.
The step part 210 is formed by recessing the entire width of the PC beam 20, or as illustrated, by recessing a widthwise central part of the end part of the PC beam 20 so that the steel bracket 30 is inserted into the step part 210, so the step part 210 functions to prevent the steel bracket 30 from being exposed to the outside and to prevent the detachment of the PC beam 20.
When the step part 210 is formed in the end part of the PC beam 20, the lower reinforcement bar 230 formed in the lower part of the internal cross-section of the PC beam 20 protrudes to the step part 210, and the end part of the lower reinforcement bar 230 protruding to the step part 210 is threaded.
The step part 210 of the PC beam 20 formed in this manner is mounted on the upper part of the steel bracket 30, the lower reinforcement bars 230 of the PC beam 20 are seated on the seating parts 321 through the guide parts 331 of the steel bracket 30, and are fastened by the nuts 360 at the opposite sides of the coupling plate 320 so that the PC beam 20 resists tensile and compressive forces. In this case, each of the nuts 360 may be a coupler that has a C shape by being partially cut.
The step part 210 of the PC beam 20 is mounted on the steel bracket 30 of the PC column 10 and the nuts 360 are screwed to the lower reinforcement bars 230 to connect the PC beam 20 with the PC column 10. In this case, the interior of the steel bracket 30 and space between the steel bracket 30 and the step part 210 of the PC beam 20 may be filled with non-shrinkage mortar so that the PC beam 20 and the steel bracket 30 are integrated with each other.
In addition, when installing the PC beam 20, a shim plate 410 may be provided on the upper part of the seating plate 330 to absorb a vertical installation error, and a shim plate 420 may be provided on a joint surface of the PC column 10 and the PC beam 20 on the upper part of the steel bracket 30 to absorb a horizontal installation error.
In this manner, the PC beam 20 is mounted onto the PC column 10 and joined thereto by using a bolt fastening method. A coupler 50 for connecting a reinforcement bar is embedded in a portion above a position at which the steel bracket 30 is installed in the PC column 10 so that a first end part of the coupler 50 is exposed, and after an upper reinforcement bar 60 is arranged in the upper part of the PC beam 20 so that a second end part of the upper reinforcement bar 60 is coupled to the coupler 50 after the PC beam 20 is coupled to the steel bracket 30 of the PC column 10, concrete 70 may be poured in the upper part of the PC beam 20 to be integrated with the upper structure of the PC beam 20.
As described above, according to the seismic-resistant joint structure of a PC column and a PC beam using a steel bracket of the present disclosure, the steel bracket is installed on the PC column by protruding therefrom to mount the PC beam to the PC column so that the PC column and the PC beam are simply joined by using a bolt fastening method, thereby reducing construction and finishing work while preventing accidents to shorten a construction period, and enabling the implementation of the performance of an intermediate moment frame or higher.
Although the present disclosure has been described in detail with reference to the presented embodiment, those skilled in the art will be able to make various modifications and variations of the present disclosure without departing from the technical spirit of the present disclosure with reference to the presented embodiment. The present disclosure is not limited by such modifications and variations, but is limited by the claims appended below.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2023-0123049 | Sep 2023 | KR | national |
