KR100652896B1 - Connection system with headed reinforcements for precast concrete beam-column joint - Google Patents

Abstract

The present invention provides a beam-column ramen structure using precast concrete (hereinafter referred to as "PC"), to join a PC beam and a PC column by using vertical non-contact overlapping joints and mechanical fixing of the head reinforcement. To a joint connection system of a precast beam-column.

The main gist of the present invention is to connect the beam and the pillar by embedding the head reinforcing rods at both ends in the interior of the beam without embedding the lower reinforcement of the PC beam without protruding from the end of the beam at the site. In order to provide a system, the lower reinforcement of the PC beam and the head reinforcing bar placed inside the concrete cast in the site of the PC beam is overlapped by the pressure of the concrete, thereby significantly reducing the overlapping length of the reinforcing bars according to the existing attachment method On the other hand, the workability is improved.

Beam to Column, Connection, Precast Concrete, Head Reinforcement

Description

Connection system with headed reinforcements for precast concrete beam-column joint

1 is a cross-sectional view showing the construction state of the joint of the existing precast beam-column

Figure 2 is a cross-sectional view showing another construction state of the connection portion of the existing precast beam-column

Figure 3 is an exploded perspective view of the junction of the beam-pillar showing an embodiment according to the present invention

Figure 4 is a cross-sectional view showing the installation state of the head reinforcement to the junction in the present invention

Figure 5 is a perspective view showing a state in which the head reinforcement and the upper reinforcement is installed in the present invention

6 is a cross-sectional view showing a construction state of the joint portion according to the present invention;

7 is a side cross-sectional view of a precast beam in accordance with the present invention.

8 is a cross-sectional view showing a construction state of the junction according to the invention

9 is a side cross-sectional view of the constructed state of the precast beam according to the present invention;

10 is a cross-sectional view showing another construction state of the joint portion according to the present invention;

11 and 12 are a plan view showing another construction state of the joint portion according to the present invention

[Description of Symbols for Main Parts of Drawing]

1: Precast Concrete (PC) Column 2: Precast Concrete (PC) Beam

3: lower reinforcing bar 4: overlay concrete

5: upper rebar 6: head rebar

7: Stirrup 8: Lateral reinforcement

9: column

The present invention provides a beam-column ramen structure using precast concrete (hereinafter referred to as "PC"), to join a PC beam and a PC column by using vertical non-contact overlapping joints and mechanical fixing of the head reinforcement. To a joint connection system of a precast beam-column.

In general, in order to join the precast beams to the precast column in the construction of the joint inside the beam-column of the building, construct by applying the method of fixing the lower reinforcing bar of the beam embedded in the precast beam to the beam-column joint over a predetermined length. have.

The joint of the conventional PC beam-column is the lower reinforcement of the precast (PC) beam 2 protruding in the form of a standard hook at an angle of 90 ° out of the precast (PC) beam 2, as shown in FIG. (3) is placed in the joint portion on the precast (PC) column (1), and the pre-reinforced (PC) beam (2) and precast (PC) column (1) by placing the upper reinforcement and casting concrete on site ) Is bonded.

In this case, the two to four beam lower reinforcing bars arranged on the column overlap each other, greatly reducing the workability of the assembly of the PC beam and the column, and much time and effort are required for the detailed design of the joint. When welding the lower reinforcing bar (3) of the beam together, the lower reinforcing bar (3) of the PC beam (2) facing each other should be exactly matched, but there are many cases that do not match due to construction errors in the manufacturing process and difficult to spot welding .

In order to improve the constructability of the conventional PC beam-column junction, the lower reinforcing bars of the precast beams to be arranged on both sides of the pillars are bent by 90 ° near the center line of the column, and bent by 90 ° to compensate for the lack of fixing strength. The rebar fixing device and method of precast beams for attaching the support to the lower rebars of the precast beams and fastening them with bolts have been registered as Korean Patent No. 0308757.

The details of the PC beam-column junction proposed in the existing pre-registered technology have the following unreasonable problems.

First, it can be applied only to the inner joint where the beams are joined to both sides of the column. Also, if the four beams are joined to the column, these details can be applied to only two beams facing each other.

Next, there are a lot of additional hardware (parts) used for joining, the economy is low, and there is a problem that the construction process is added to this by assembling additional hardware in the field.

Next, in the system where the PC column is connected in the middle of the floor of the building, the PC column is arranged above and below the column root of the joint, so when the beam is installed from the side, there is a problem in that the existing details in which the lower reinforcing bar of the beam protrudes are impossible. .

The present invention has been made to solve the problems caused by the conventional method of joining the precast beam-column, embedded in the beam without protruding the lower reinforcement of the PC beam outside the end of the beam and inside the front of the PC beam in the field It is intended to provide a connection system for joining beams and columns by installing head reinforcement heads formed at both ends of the head reinforcement. By overlapping joints, the length of overlapping joints of rebars according to the existing attachment method is greatly reduced.

In addition, when used in the outer joint of the beam-column, it is mechanically fixed by the head reinforcement in the joint panel zone, which reduces the anchoring length and greatly improves the workability as the reinforcement details in the joint are much simpler than the conventional 90 ° standard hook type fixing details. It is a main object of the present invention to provide a joint connection system.

The present invention is to provide a connection system for joining a beam and a pillar by installing a head reinforcing head reinforcement at both ends inside the PC beam, the configuration of an embodiment according to the invention in Figures 3 to 12 shown in the drawings It is shown in detail.

The main feature of the embodiment according to the invention is to be fixed by bending the lower reinforcement (3) of the PC beam (2) to be arranged on both sides of the junction (1a) of the PC column (1) at 90 ° near the center line of the column, 90 ° In the reinforcing bar fixing device of the precast beams to support the lower reinforcing bar (3) of the PC beam (2) bent with a bolt and fasten it with a bolt,

A PC in which a reinforcing bar is installed so that a joint groove 2a recessed in a distal end of the PC column 1 is formed and the lower reinforcing bar 3 is embedded in the distal end, and the stub 7 is exposed to the upper end. Beam 2; A head reinforcement 6 having a predetermined length arranged at one end of the PC beam 2 at the joining groove 2a and the other end at the joining portion 1a of the PC column 1; An upper reinforcing bar 5 installed at the upper end of the PC beam 2 so as to be disposed at the junction 1a of the stub 7 reinforcing bar and the PC column 1; In the PC beam 2, the overlaid concrete 4 is poured into the joining groove 1a of the upper end portion where the upper reinforcing rod 5 is installed and the tip groove where the head reinforcing rod 6 is disposed and the joining portion 1a of the PC pillar 1. It is characterized by the construction.

In the present invention, the PC beam (2) is installed by placing a plurality of lower reinforcement (3) to the lower side, the lower reinforcement (3) is installed to be embedded in the interior from the tip portion, a plurality of stirrups in the width direction to be exposed to the upper end ( 7) Reinforcing bars are installed at regular intervals, and the joining grooves 2a are formed to be recessed downwards at the distal ends of the PC beams 2 arranged at the joining portions 1a of the PC columns 1.

The joining groove 2a formed at the tip end of the PC beam 2 is formed to have an appropriate length and width, and is formed to be recessed in a ∪ shape so that the upper part is opened, and the tip end of the PC beam 2 manufactured in such a configuration. Is placed on the joint 1a of the PC column 1 and arranged.

In general, the PC pillar (1) in the building is embedded in the reinforcing bars of several pillars (9) to form a rectangular shape or round inside, 2 to 4 at the junction (1a) of such a PC pillar (1) PC beam 2 is installed in the direction of the connection.

The main feature of the present invention is to use the head reinforcement (6) to connect the PC beam (2) to the joint (1a) of the PC column (1) using a vertical non-contact overlapping joint and mechanical fixing, where the head reinforcement (6) is manufactured to a predetermined length, but is formed by forming a round or square head portion 6a having a relatively large diameter at both ends.

The head reinforcement 6 in which the head part 6a is formed in both front-end | tips in the above is arrange | positioned at the one end in the joining groove 2a of the PC beam 2, and the other end is the joining part 1a of the PC pillar 1. A plurality of vertical non-contact overlapping joints are arranged in the inside, and several upper bars 5 are installed by reinforcing the joints 1a of the stub 7 and the PC column 1 at the upper end of the PC beam 2, and the joints are installed. At the distal end of the upper reinforcing bar 5 provided in (1a), a circular or rectangular head portion 5a having a relatively large diameter is formed and provided.

Looking at the construction process according to an embodiment of the present invention made of such a configuration as follows.

First, as shown in FIGS. 4 to 6, several lower reinforcing bars 3 are embedded in the tip portion, and a plurality of stub 7 reinforcing bars are manufactured to be exposed to the upper end portion, while the upper portion is open in the shape of a concave groove. A plurality of head reinforcing bars 6 in which head portions 6a are formed at both ends thereof in a state where the leading end of the PC beam 2 having the (2a) is placed on one of the joint portions 1a of the PC pillar 1 are arranged. The upper reinforcing bar 5 which is arrange | positioned in the joining groove 2a of (2) and the joining part 1a of the PC pillar 1, and the head part 5a was formed in the front-end | tip, PC beam 2 and PC pillar 1 And install the lateral reinforcement 8 in the column circumference 9 of the joint 1a, and install the upper part of the PC beam 2 and the PC column 1 as shown in FIGS. 8 and 9 in the drawing. It is to be built by pouring the added concrete (4) to the junction (1a) of.

In the above, installed by placing the upper reinforcing bar (5) to the junction (1a) of the PC beam (2) and PC pillar (1), and then install a separate formwork on the PC beam (2) and PC pillar (1), It is constructed by pouring the concrete (4) inside, and the concrete (4) is poured into the joint groove (2a) of the PC beam (2) on which the head reinforcement (6) is disposed and the joint (1a) of the PC column (1). As the construction is performed, the head reinforcement 6 vertically contactlessly disposed on the PC beam 2 and the PC pillar 1 is subjected to overlapping joints under the pressure of the concrete, thereby maintaining a strong anchorage.

10 shows a construction state in which the PC beams 2 are installed in two directions on the joint portion 1a of the PC pillar 1, and the PC beams 2 at both ends of the joint portion 1a of the PC pillar 1 are shown in FIG. The tip of the head reinforcement 6 is placed in the joining groove 2a of the PC beam 2 disposed on one side, and the other end of the head reinforcement 6 is joined to the joint 1a. In the joint groove (2a) of the other PC beam (2) arranged on the opposite side is to install the formwork on the PC beam (2) and the PC column (1) and to install the overlaid concrete (4).

In addition, Figure 11 and Figure 12 shows another construction state of the present invention, showing the construction state in which the PC beam 2 is installed in three to four directions at the junction 1a of the PC pillar (1) The distal end of the PC beam 2 is arranged in three or four directions at the joint 1a of 1), and a plurality of head bars 6 are arranged on the PC column 1 and the PC beam 2 or mutually. It is installed by placing in the joining groove (2a) of the opposing PC beam (2), and then install the formwork and pouring the concrete (4) for construction.

In the present invention, the head reinforcement 6 is disposed at the junction 1a and the PC beam 2 of the PC pillar 1, and the upper reinforcement 5 is installed by the reinforcement work, so that the junction part (1) at the PC pillar 1 is formed. The reinforcement details in 1a) are very simple, greatly improving the workability, and the PC beam 2 can be installed in four directions at the junction 1a of the PC column 1, thereby simplifying the construction work and design.

The preferred embodiments of the present invention have been described above with reference to the present invention, but are not limited to the above embodiments, and those skilled in the art through the above embodiments do not depart from the gist of the present invention. Can be implemented in a variety of changes.

As described above, according to the present invention, by connecting the connection of the PC beam-column using the head reinforcement, the connection details are simplified, and the interference between the lower reinforcing bars of the PC beams intersecting at the connection is solved at the same time. The assembly construction is greatly improved to reduce the design cost and construction cost of the joint.

In addition, since the lower reinforcing bar of the PC beam does not protrude to the outside, it is easy to manufacture the mold of the PC beam in the factory, and the manufacturing process is simplified and the manufacturing cost is low, while the length of the PC beam is reduced, so that the transport work to the construction site is easy .

In addition, PC beams without lower reinforcing bars can be inserted from the side of the joint of beam-column even at the joint jointed in the middle of the existing difficult construction floor, which enables construction and greatly expands the applicable object according to construction. By reducing the length of overlap joint, the amount of rebar can be reduced and it can be used even in the place where the beam-column junction area is narrow.

Claims (4)

The lower reinforcing bar 3 of the PC beam 2 to be disposed on both sides of the joint 1a of the PC column 1 is bent and fixed at 90 ° near the center line of the column, and the PC beam 2 bent at 90 °. In the reinforcing bar fixing device of the precast beam for fixing the support to the lower reinforcing bar (3), and fastened by bolt A PC in which a reinforcing bar is installed so that a joint groove 2a recessed in a distal end portion of the PC column 1 is formed and the lower reinforcing bar 3 is embedded in the distal end, and the stirrups 7 are exposed to the upper end. Beam 2; A head reinforcement 6 having a predetermined length arranged at one end of the PC beam 2 at the joining groove 2a and the other end at the joining portion 1a of the PC column 1; An upper reinforcing bar 5 installed at the upper end of the PC beam 2 so as to be disposed at the junction 1a of the stub 7 reinforcing bar and the PC column 1; In the PC beam 2, the overlaid concrete 4 is poured into the joining groove 1a of the upper end portion where the upper reinforcing rod 5 is installed and the tip groove where the head reinforcing rod 6 is disposed and the joining portion 1a of the PC pillar 1. Precast beam-column connection system using head reinforcement, characterized in that the construction. The method of claim 1, Large head portions 5a and 6a are provided at the tip of the upper reinforcement 5 installed at the upper end of the PC beam 2 and the junction 1a of the PC column 1 and at both ends of the head reinforcement 6. Precast beam-column connection system using a head reinforcement, characterized in that formed. The method of claim 1, One end of the head reinforcement 6 is disposed in the joining groove 2a of the PC beam 2 arranged on one side at the joint 1a of the PC column 1, and the other end of the head reinforcement 6 is A joint connection system of a precast beam-column using a head reinforcement, characterized in that it is disposed in a joining groove (2a) of another PC beam (2) arranged on the opposite side from the joining portion (1a) of the PC column (1). The method of claim 1, Joining connection system of the precast beam-column using head reinforcement, characterized in that the joining groove (2a) formed in the distal end of the PC beam (2) is formed to be recessed in the shape of an open top.

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