WO2020242094A1

WO2020242094A1 - Pc beam-column joint

Info

Publication number: WO2020242094A1
Application number: PCT/KR2020/006224
Authority: WO
Inventors: 김군삼; 강토마스현구; 성한석
Original assignee: 서울대학교 산학협력단; 김군삼
Priority date: 2019-05-29
Filing date: 2020-05-12
Publication date: 2020-12-03
Also published as: KR102114890B1

Abstract

The present invention relates to a PC beam-column joint wherein, when a PC beam and a PC column are joined, an enlarged head portion of a headed bar which protrudes/is coupled to an end of the PC bar is fixed inside a containing space of a containing socket buried in a side surface of the PC column by a fixing cap nut, thereby making it easy to fabricate and install a PC member, making a provisional support for supporting the PC beam unnecessary, and making it possible to minimize field operations. The PC beam-column joint according to the present invention relates to a joint between a PC beam and a PC column, characterized in that a headed bar having an enlarged head portion formed on an end of the body thereof is coupled, so as to protrude, to the upper and lower portions of an end of the PC beam; a containing socket is buried in a side surface of the PC column such that the rear end thereof is fixed to an anchor bar anchored in the PC column, the containing socket having a containing space formed therein such that the enlarged head portion of the headed bar is inserted into the front thereof; and the enlarged head portion of the headed bar is fixed inside the containing space of the containing socket by a fixing cap nut.

Description

PC beam-to-column connection

In the present invention, when the PC beam and the PC column are joined, the enlarged head of the headed bar protruding from the end of the PC beam is fixed in the receiving space of the receiving socket embedded in one side of the PC column by a fixing cap nut. It is for a PC beam-column joint that is easy to manufacture and install, does not need a temporary support for PC beam support, and can minimize field work.

In spite of various advantages, the cast-in-place reinforced concrete construction method is highly affected by the on-site environment and weather conditions, is manpower-intensive, so there is a limitation in shortening the time period, and quality control is difficult.

Accordingly, the application of the precast concrete method, which manufactures members in factories and assembles them on site, is increasing, and in particular, after the introduction of the 52-hour working week system, the difficulty in operating on-site personnel has increased, leading to increased interest in the PC method.

However, since the PC method is to assemble pre-fabricated members on site, it is difficult to process the joints between members, and various joint details have been developed.

In the conventional registration utility model No. 20-0414349, a PC beam was mounted on the top of the PC column in the lower part and on-site concrete was poured into the space between the PC column and the PC beam was treated. At this time, a fixing reinforcing bar or the like protrudes from the end of the PC beam to be settled inside the column, thereby strongly joining the beam to the column.

In addition, when the PC column is composed of a multi-layered one cutout, as shown in Fig. 1, the PC column of the upper layer and the PC column of the lower layer, which are connected to each other, are inserted between the upper and lower PC columns while spaced up and down by the height of the beam If possible, mount the PC beam on the bracket at the top of the lower PC post.

However, in this prior art, since the fixing reinforcement protrudes from the end of the PC beam, it is not easy to manufacture, as well as transport and load the PC member. And when installing the PC beam, the installation work is difficult due to the interference of the main root of the PC column.

In addition, in the case of PC pillars, the upper and lower pillars are separated and the brackets are protruding, making it cumbersome to make molds, and the main roots between the upper and lower pillars are exposed, so there is a risk of deformation during the transport and installation process, as well as corrosion of the exposed main muscles. .

In addition, since it is necessary to pour concrete between the upper and lower columns after installing the PC beam, it takes a long time to work, and there is a hassle of supporting the PC beam with a temporary support before concrete hardening.

In order to solve the above problems, the present invention is to provide a PC beam-column joint that is easy to manufacture and install a PC member, does not require a temporary support for supporting the PC beam, and minimizes field work.

The present invention according to a preferred embodiment relates to a joint portion of a PC beam and a PC column, wherein a headed bar having an enlarged head formed at an end of the main body is coupled to protrude at the upper and lower ends of the PC beam, and one side of the PC column The rear end is fixed to the fixing bar fixed in the PC column, and a receiving socket in which a receiving space into which the enlarged head of the headed bar is inserted is embedded in the front, and the enlarged head of the headed bar is a receiving socket by a fixed cap nut. It provides a PC beam-column junction, characterized in that fixed in the receiving space of.

The present invention according to another preferred embodiment is provided with a coupler coupled to the end of the main reinforcement inside the PC beam at the end of the PC beam, the main body of the headed bar is a PC beam-column joint, characterized in that coupled to the coupler Provides.

The present invention according to another preferred embodiment provides a PC beam-column joint, characterized in that a lock nut in close contact with the coupler is coupled to the body of the headed bar.

The present invention according to another preferred embodiment provides a PC beam-column joint, characterized in that the fixing bar is configured to yield earlier than the headed bar.

The present invention according to another preferred embodiment is a PC beam-column joint, characterized in that the mounting bracket is coupled to one side of the PC pillar to which the PC beam is joined, and is inserted into and supported in the mounting groove formed in the lower center of the end of the PC beam Provides.

According to the present invention as described above has the following effects.

First, when the PC beam and the PC column are joined, the extended head of the headed bar protruding from the end of the PC beam is fixed in the receiving space of the receiving socket embedded in one side of the PC column by a fixing cap nut. PC beam can be directly bonded to Therefore, since there is no configuration that protrudes to the outside of the PC column, it is easy to manufacture and install the PC member, and there is no need for temporary support for supporting the PC beam, and on-site work can be minimized.

Second, when the main body of the headed bar is configured to be continuous with the main reinforcement of the PC beam, the main reinforcement of the PC beam is connected to the receiving socket by the headed bar. Accordingly, it is possible to form a special moment frame that can secure ductility while forming a strong connection at the PC beam-column connection. The headed bar can smoothly transmit tensile or compressive force to the inside of the column with respect to the bending moment of the joint.

Third, when the main body of the headed bar is coupled to the coupler coupled to the end of the main reinforcement inside the PC beam, the headed bar does not protrude outside the PC beam during the process of manufacturing and transferring the PC beam. Therefore, it is easy to manufacture and install PC beams.

1 is a view showing a connection between a conventional PC beam and a PC column.

Figure 2 is a perspective view showing the bonding relationship between the PC beam and the PC column.

Figure 3 is a perspective view showing the coupling relationship between the main reinforcement bar, headed bar and fixed cap nut of the PC beam.

4 is a cross-sectional view showing a coupling relationship between a headed bar and a fixed cap nut.

5 is a perspective view showing a coupling relationship between a headed bar and a receiving socket.

6 is a cross-sectional view showing a state in which the headed bar is fixed in the receiving socket.

7 is a cross-sectional view showing a coupling relationship between a headed bar when a coupler is provided.

Figure 8 is a perspective view showing the coupling relationship between the mounting bracket and the PC post.

9 is a perspective view showing the coupling relationship between the PC beam and the PC column by the mounting bracket.

10 is a cross-sectional view showing a coupling relationship between a PC beam and a PC column when the mounting bracket is provided.

11 is a perspective view showing another embodiment of the mounting bracket.

12 is a perspective view showing a bonding state between upper and lower PC posts.

In order to achieve the above object, the PC beam-column connection part of the present invention relates to a connection part between a PC beam and a PC column, and a headed bar having an enlarged head formed at the end of the body protrudes above and below the PC beam end. It is coupled, and the rear end is fixed to the fixing bar fixed in the PC column on one side of the PC column, and a receiving socket in which an accommodation space into which the enlarged head of the headed bar is inserted is embedded in the front, and the headed bar is expanded. It is characterized in that the head is fixed in the receiving space of the receiving socket by the fixing cap nut.

Hereinafter, the present invention will be described in detail according to the accompanying drawings and preferred embodiments.

FIG. 2 is a perspective view showing the bonding relationship between the PC beam and the PC column, and FIG. 3 is a perspective view showing the bonding relationship between the main reinforcement bar, the headed bar, and the fixed cap nut of the PC beam. And Figure 4 is a cross-sectional view showing the coupling relationship between the headed bar and the fixing cap nut, Figure 5 is a perspective view showing the coupling relationship between the headed bar and the accommodation socket, Figure 6 is a cross-sectional view showing a state in which the headed bar is fixed in the accommodation socket. .

As shown in Figs. 2 to 6, the PC beam-column connection of the present invention relates to a connection between the PC beam 1 and the PC column 2, and the upper and lower ends of the PC beam 1 have a main body ( The headed bar 12 having the enlarged head 122 formed at the end of 121 is coupled to protrude, and the rear end of the fixing bar 21 fixed in the PC post 2 on one side of the PC post 2 The receiving socket 22, in which the receiving space 221 into which the enlarged head 122 of the headed bar 12 is inserted, is formed, is embedded in the front, and the enlarged head of the headed bar 12 It characterized in that (122) is fixed in the receiving space 221 of the receiving socket 22 by the fixing cap nut (13).

The present invention is to provide a PC beam-column joint that is easy to manufacture and install a PC member, does not require a temporary support for supporting the PC beam (1), and can minimize field work.

The headed bar 12 is coupled to the upper and lower ends of the PC beam 1 so as to protrude.

As shown in FIGS. 3 and 4, the headed bar 12 has an enlarged head 122 formed at an end of the main body 121.

A receiving socket 22 into which the headed bar 12 is inserted is embedded in one side of the PC pillar 2 at a position corresponding to the headed bar 12.

The receiving socket 22 has a receiving space 221 formed therein.

After inserting the enlarged head 122 of the headed bar 12 into the receiving space 221 of the receiving socket 22, close to the bottom of the receiving space 221, the enlarged head part with a fixed cap nut 13 (122) is fixed in the receiving space 221 of the receiving socket 22.

The fixed cap nut 13 has a through hole 131 formed in the center so that the main body 121 of the headed bar 12 penetrates, and the enlarged head 122 of the headed bar 12 is caught at the front end. Can be configured to

Referring to FIG. 5, the coupling relationship between the headed bar 12 and the receiving socket 22 will be described as follows.

First, as shown in (a) of FIG. 5, a fixing cap nut 13 having a screw thread on the outer circumferential surface and a receiving socket 22 having a female thread on the inner circumferential surface of the receiving space 221 are prepared. And, as shown in (b) of FIG. 5, the enlarged head 122 of the headed bar 12 is inserted into the receiving space 221 of the receiving socket 22.

Thereafter, as shown in (c) of FIG. 5, the fixed cap nut 13 is moved forward into the receiving space 221 by rotation of the fixed cap nut 13 and screwed into the receiving socket 22. At this time, the fixing cap nut 13 presses the enlarged head 122 of the headed bar 12 to make it in close contact with the bottom surface of the receiving space 221.

Since the fixing cap nut 13 is screwed into the receiving space 221 of the receiving socket 22 to fix the headed bar 12, the receiving socket 22 needs to protrude to the outside of the PC column 2 There is no

As shown in FIGS. 3 and 4, a polygonal tool coupling portion 132 may be formed on the outer circumferential surface of the fixed cap nut 13 to rotate the fixed cap nut 13.

In this case, since the fixing cap nut 13 can be fastened only by rotation, it can be easily operated without an additional power source.

The rear end of the receiving socket 22 to which the fixing bar 21 is coupled is preferably formed in a streamlined shape so as to smoothly transfer stress to tension or compression without concentration of stress.

The main body 121 of the headed bar 12 may be configured to be continuous with the main reinforcing bars 11 located in the upper and lower portions of the PC beam 1.

Accordingly, the main reinforcing bar 11 of the PC beam 1 is connected to the receiving socket 22 by the headed bar 12 to form a special moment frame capable of securing ductility while forming a strong connection at the beam-column joint. Can be formed.

The headed bar 12 is continuous with the main reinforcing bar 11 inside the PC beam 1 to transmit a tensile or compressive force to the inside of the PC column 2 with respect to the bending moment of the joint.

That is, when a compressive force occurs at the beam-column joint, the enlarged head 122 of the headed bar 12 is in close contact with the bottom surface of the receiving socket 22, and the receiving socket 22 is applied by a bearing force. ) The load is directly transmitted to the fixing bar 21 at the rear end.

When tensile force occurs at the beam-column joint, the enlarged head 122 of the headed bar 12 is caught by the fixing cap nut 13 and is loaded onto the fixing bar 21 by tensioning the receiving socket 22. Is delivered.

Unlike the prior art in which the PC beam 1 is mounted on the top of the PC pillar 2, in the present invention, the PC beam 1 is directly bonded to the side of the PC pillar 2.

At this time, since the receiving socket 22 of the PC pillar 2 can be embedded in the PC pillar 2 to form the same surface as the PC pillar 2, there is no configuration protruding out of the PC pillar 2.

Therefore, since it is possible to integrally manufacture the multi-layered single-cut PC column 2 without segmenting the column, the production efficiency of the PC member is excellent and member management is easy.

As shown in FIG. 6 and the like, the non-shrinkable mortar 3 may be filled in the empty space between the end of the PC beam 1 and the surface of the PC pillar 2.

The fixed cap nut 13 can be firmly fixed by the filled non-shrinkable mortar 3.

A stepped portion 14 for mounting a PC slab may be formed on the upper surface of the PC beam 1.

The fixing bar 21 may be configured to yield earlier than the headed bar 12.

In the present invention, the distance between the PC column 2 and the PC beam 1 is quite wide, and only the non-shrinkable mortar 3 is filled outside the headed bar 12, and there is no separate strip reinforcement. That is, since the headed bar 12 is an unconstrained section, when the headed bar 12 yields, the ductile behavior of the joint is difficult.

Therefore, in order to guide the yield point to the anchoring bar 21 in the column so that yield does not occur at the joint when repeated loads such as earthquake loads are applied, the yield strength of the anchoring bar 21 is lower than the yield strength of the headed bar 12. Can be formed.

Accordingly, even after yielding of the fixing bar 21, the elastic behavior is maintained in the headed bar 12, and a ductile behavior is possible as a whole.

For this purpose, the headed bar 12 may first yield by adjusting the yield strength and cross-sectional area, that is, the diameter of the fixing bar 21 and the headed bar 12 in detail.

For example, when the diameter of the headed bar 12 is 39 mm and the yield strength (F _y ) is 1100 MPa, the fixing bar 21 may use a steel bar having a yield strength (F _y ) 800 MPa and a diameter of 45 mm. have.

As shown in Figure 7, the end of the PC beam 1 is provided with a coupler 16 coupled to the end of the main reinforcement 11 inside the PC beam 1, the main body of the headed bar 12 ( 121 may be configured to be coupled to the coupler 16.

When the headed bar 12 is protruded from the end of the PC beam 1, it is difficult to manufacture and manage the PC beam 1.

Therefore, after manufacturing the PC beam (1) without the headed bar (12) and bringing it to the site, the inside of the PC beam (1) can be connected to the headed bar (12) before installation of the PC beam (1). The coupler 16 coupled to the main reinforcement 11 may be embedded in the end of the PC beam 1.

In addition, in the present invention, since the headed bar 12 is moved horizontally into the receiving socket 22 to be coupled, the entire PC beam 1 in which the headed bar 12 is installed has a length of the PC column 2 ) Must be larger than the distance between them.

In the present invention, in a state in which the headed bar 12 is retracted to the inside of the coupler 16 as shown in FIG. 7 (a), the PC beam 1 is mounted on a mounting bracket 23 to be described later, and then, FIG. 7 As shown in (b) of, the headed bar 12 is rotated to move horizontally into the receiving socket 22 and inserted into the receiving space 221.

And, as shown in Figure 7 (c), it can be installed in the order of fixing the headed bar 12 to the receiving socket 22 by the fixing cap nut 13.

As shown in FIG. 6 and the like, a lock nut 17 in close contact with the coupler 16 may be coupled to the body 121 of the headed bar 12.

After moving forward so that the headed bar 12 is inserted into the receiving socket 22, a lock nut 17 is attached to the main body 121 of the headed bar 12 to fix the position of the headed bar 12. Can be combined.

The lock nut 17 is firmly fixed in the non-shrinkable mortar 3 after curing the non-shrinkable mortar 3.

8 is a perspective view showing the coupling relationship between the mounting bracket and the PC post, Figure 9 is a perspective view showing the coupling relationship between the PC beam and the PC post by the mounting bracket, Figure 10 is a PC beam and a PC when equipped with a mounting bracket It is a cross-sectional view showing the coupling relationship between the pillars. And Figure 11 is a perspective view showing another embodiment of the mounting bracket.

As shown in Figs. 8 to 11, a mounting bracket 23 is coupled to one side of the PC column 2 to which the PC beam 1 is joined, and is formed in the lower center of the end of the PC beam 1 It can be configured to be supported by being inserted into the groove (15).

A mounting bracket 23 may be coupled to one side of the PC pillar 2 so as to protrude outward.

In addition, the PC beam 1 may be formed with a mounting groove 15 into which the mounting bracket 23 can be inserted at a lower center of the end.

Accordingly, the mounting groove 15 of the PC beam 1 is inserted into the mounting bracket 23 so that the PC beam 1 is mounted on the mounting bracket 23, and the headed bar 12 is a receiving socket. Can be easily fixed to (22).

That is, the mounting bracket 23 supports the PC beam 1 until the headed bar 12 is fixed, and transmits a shear force at the junction.

As shown in Fig. 9, the PC beam 1 can be supported simply by descending from the top to the bottom so that the mounting groove 15 is inserted into the mounting bracket 23 to be mounted.

As shown in Figure 9, the mounting groove 15 may be formed with an air hole 151 communicating with the upper surface of the PC beam (1).

It is possible to tightly fill the non-shrinkable mortar 3 into the mounting groove 15 through the air hole 151.

As shown in FIGS. 8 and 10, an embedded plate 24 for coupling the mounting bracket 23 may be embedded in the PC post 2 in advance.

In this case, the mounting bracket 23 can be fixed to the embedded iron plate 24 by a bolt 25.

Therefore, when the PC pillar 2 is manufactured, there is no protruding part to the outer surface of the PC pillar 2, so manufacturing and management of the PC pillar 2 is easy.

An uneven portion may be formed in a horizontal direction on a front surface of the buried iron plate 24 and a rear surface of the mounting bracket 23, respectively. By fixing the vertical position of the mounting bracket 23 by the uneven portion, it is possible to support the load of the PC beam 1 by shear friction.

After the installation of the PC beam (1) is completed, when filling the non-shrinkable mortar (3) in the space between the end of the PC beam (1) and the PC column (2), the non-shrinkable mortar (3) also inside the mounting groove (15) Can be charged.

As shown in Fig. 10, when the PC beams 1 are coupled to both sides of the PC pillar 2, the receiving sockets 22 on both sides are connected with one fixing bar 21, and the neighboring PC beams ( It can be joined so that both ends of 1) are continuous.

As shown in Fig. 11, the mounting bracket 23 has a rounded top so that the mounting bracket 23 can be easily inserted into the mounting groove 15 when mounting the PC beam 1 on the top. I can.

12 is a perspective view showing a state of bonding between upper and lower PC posts.

As shown in FIG. 12, even when connecting vertically adjacent PC pillars 2, 2', a pocket portion 27 is formed at the lower end of the upper PC pillar 2'to be headed in the pocket portion 27. It is possible to make the bar 28 protrude. And by embedding the receiving socket 26 on the upper end of the lower PC post (2), it can be configured to be fixed with the fixing cap nut 29 in the same manner as the present invention PC beam-column joint.

Accordingly, it is possible to manufacture the PC pillars 2 and 2'without protruding portions for fixing at the top and bottom of each PC pillar 2, 2'.

The PC beam-column joint of the present invention is fixed in the receiving space of the receiving socket embedded in one side of the PC column by a fixing cap nut to the enlarged head of the headed bar protrudingly coupled to the end of the PC beam. Direct bonding is possible. Accordingly, manufacturing and installation of the PC member is easy, there is no need for temporary support for supporting the PC beam, and there is a possibility of industrial use in that field work can be minimized.

Claims

It relates to the junction of the PC beam (1) and the PC column (2),

A headed bar 12 having an enlarged head 122 formed at the end of the main body 121 is coupled to protrude at the top and bottom of the end of the PC beam 1, and a PC on one side of the PC column 2 The rear end is fixed to the fixing bar 21 fixed in the pillar 2, and a receiving socket 22 having a receiving space 221 into which the enlarged head 122 of the headed bar 12 is inserted is formed. A PC beam-column joint, characterized in that the embedded, enlarged head 122 of the headed bar 12 is fixed in the receiving space 221 of the receiving socket 22 by a fixing cap nut 13.
In claim 1,

At the end of the PC beam 1, a coupler 16 coupled to the end of the main reinforcement 11 inside the PC beam 1 is provided, and the main body 121 of the headed bar 12 is the coupler 16 PC beam-column connection, characterized in that coupled to.
In paragraph 2,

A PC beam-column joint, characterized in that a lock nut 17 in close contact with the coupler 16 is coupled to the body 121 of the headed bar 12.
In claim 1,

The fixing bar 21 is a PC beam-column joint, characterized in that configured to yield earlier than the headed bar (12).
In claim 1,

A mounting bracket 23 is coupled to one side of the PC column 2 to which the PC beam 1 is joined, and is inserted and supported in the mounting groove 15 formed at the lower center of the end of the PC beam 1 PC beam-to-column connection made by the user.