KR200414349Y1 - Connection structure of precast concrete structure - Google Patents

Abstract

The present invention relates to the connection structure of the precast concrete structure, and in each PC column, the additional reinforcing structure is installed in the connecting bar between the upper and lower columns to prevent the bending of the connecting bar and the collapse of the column. Free, which can be prevented, and the fall of the PC beam from the PC pillar during construction by being fixed to each other by the bracket and the fixing reinforcing bars arranged on both sides of the linearly arranged PC beams on the PC pillar. The connection structure of the cast concrete structure.

Precast Concrete, PC, Column, Beam, Bracing, Bracket, Reinforcing Bar

Description

Connection structure of precast concrete members

1a to 1e is a construction process diagram of a conventional PC method,

Figure 2 is a perspective view showing the assembly structure of the PC column and PC beam in a conventional PC method,

Figure 3 is a front view showing the assembling structure of the PC column and PC beam when a two-layer 1 column PC column is applied in a conventional PC method,

4 is a construction process diagram showing an example of a construction method of connecting the connection position of the upper and lower PC pillars to the central point of the floor in the conventional PC construction method,

5 is a perspective view illustrating a connection structure between an upper pillar and a lower pillar in each PC pillar of FIG. 4;

6A is a perspective view illustrating an example in which a joint reinforcing bar is installed between PC beams in the method of FIG. 4;

6B is a perspective view illustrating an example in which steel wires are installed in PC beams in the method of FIG. 4;

7a and 7b is a front view showing the connection structure between the upper pillar and the lower pillar of the PC pillar in the connection structure of the precast concrete structure according to the present invention,

8A and 8B are cross-sectional views taken along the line 'A-A' in FIGS. 7A and 7B, respectively;

9a and 9b is a cross-sectional view of each embodiment showing a connection structure between the PC beam in the connection structure of the precast concrete structure according to the present invention,

10A and 10B are plan views of respective embodiments shown in FIGS. 9A and 9B,

11A and 11B are cross-sectional views taken along the lines 'B-B' and 'C-C' of FIG. 10B, respectively;

12a and 12b is a perspective view showing each embodiment of the bracket in the connection structure between the PC beam according to the present invention.

<Explanation of symbols for the main parts of the drawings>

10a, 10b: PC pillar 11: upper pillar

12: lower column pillar 13: connecting rebar

14: bracing member 15: bracing member

20: PC beam 21: empty space part

22: joint reinforcing bar 23: steel wire

24: bracket 25: plate portion

26a, 26b: rod member 27: fixed reinforcing bar

30: half slab 31: rebar

32: concrete

The present invention relates to the connection structure of the precast concrete structure, and more specifically, to prevent the bending of the connecting reinforcement by installing a brace member, which is a reinforcement structure for additional bending prevention, is additionally installed in the connecting reinforcing bar between the upper and lower columns in each PC column. And pillar collapse can be prevented, and two PC beams arranged in a straight line among the PC beams assembled on the PC pillar are mutually fixed by brackets and fixing reinforcing bars to prevent the PC beam from falling during construction. The connection structure of the precast concrete structure that can be.

In general, the method of concrete construction of members such as columns, beams, slabs, and walls in a building includes the installation of formwork, reinforcing reinforcing bars, and then casting concrete directly on the site, and reinforced concrete to a suitable size in the factory. There is a prefabricated method, that is, precast concrete (PC) method to pre-fabricate columns, beams, slabs and the like and then assemble in the field.

In the above-mentioned two methods, the site casting method requires many professional personnel, materials, and air due to the installation of formwork and temporary materials, so recently, the precast concrete (PC) method is adopted to standardize members, simplify the process, and labor. We are seeking to improve productivity.

This PC method is designed to produce PC members, such as PC columns (precast concrete columns), PC beams, and half slabs under strict quality control in factories with all-weather facilities that are not affected by weather or season. In this process, the PC members manufactured at the factory are transported, lifted and assembled to the site, and then the concrete is placed on the joint between the members and the upper half slab to integrate the structure. It is a representative industrialization method of concrete system that maximizes the use of equipment and machinery throughout, and it is possible to construct a structure having rigidity of general RC tank.

The advantages of the PC method are listed in more detail as follows.

1) Shorten air and secure quality

-Completion of high quality buildings by using PC parts manufactured in factory under high quality control

-Minimize the installation of formwork and temporary materials by assembling the prefabricated PC member, which can shorten the air and start the next process early

-It is vitalized by mechanized construction, and it is easy to secure a working space by reducing the use of temporary materials such as copper bars.

2) Productivity Improvement

-Reduced on-site personnel

-Productivity is improved by repetitive work and mechanized construction of simple process

3) Secure safety

-Safe work with little need for external scaffolding and temporary materials

-Accidents are prevented by reducing on-site personnel and improving working environment

4) Environmental protection

-Clean construction site due to little construction waste and reduced noise of dust and concrete pouring

-Reduced waste disposal costs

On the other hand, Figures 1a to 1e is a construction process diagram of a conventional PC method, showing an example of a general PC method in which the connection position of the upper and lower PC pillars (10a, 10b) is set to the floor floor.

As shown in the figure, the prefabricated PC members, such as PC columns 10a and 10b, PC beams 20, half slab 30, and the like, are assembled into slab topping concrete ( 32) is installed by placing the PC column (10b) vertically (see Figure 1a), and then assembled by connecting the PC beam 20 between each adjacent PC column (10b) standing vertically (Fig. 1b).

Then, the half slab 30 or the deck plate is supported on the PC beam 20 (see FIG. 1C), the reinforcing bars 31 are laid, and then the slab concrete 32 is poured and cured to provide the PC column 10b. The PC beam 20 and the slab S are integrated (see FIGS. 1D and 1E).

In the PC method, when using a single-layer single-wall PC pillar as the PC pillars 10a and 10b, the PC beam 20 arranged in four directions on the upper end of each of the PC pillars 10a and 10b as shown in FIG. And supporting the end of the), and installed a half slab or deck plate on the PC beam 20 assembled in four directions about each PC pillar (10a, 10b), and then reinforcement and slab concrete construction.

Then, in the state of slab construction completed as above, the new PC pillar is vertically erected at each pillar position for the upper floor construction, supported by supporting means, connected to the upper side of each pillar, and then installed at the top of each newly installed pillar. PC beams are supported and installed in the same manner, and then half slab or deck plate is installed, and reinforcement and slab concrete construction are performed (see FIGS. 1A to 1E).

Reinforcing bars 10c extending upward from the upper ends of the PC pillars 10a and 10b of FIG. 2 are reinforcing bars connected to the PC pillars (not shown) of the upper layer to be constructed later.

Next, FIG. 3 illustrates a case in which a two-layer single column PC column is applied. As shown in the figure, in the case of the two-layer single row PC column 10, one PC column product is formed on the upper layer column 11 and the lower layer. It is comprised by the pillar 12, and the upper pillar 11 and the lower pillar 12 are connected by the connecting bar 13 exposed in the middle.

In this case, in the space between the upper pillar 11 and the lower pillar 12, the end of each PC beam 20 is supported on the upper end of the lower pillar 12 to be installed, and then the half slab or deck plate Installation, reinforcement and construction of slab concrete are the same as when using single-wall PC columns.

In FIG. 3, an example of a two-tiered single PC column is illustrated, but the upper, middle, and lower columns are applied in various forms such as a single PC column connected to a middle connecting bar, that is, a three-layer single PC column. The two-layer PC column and the three-layer PC column will be manufactured in the factory as a single product and used in the field.

On the other hand, Figure 4 is a construction process diagram showing an example of the construction method of connecting the connection position of the upper and lower PC column from the floor of the existing floor to the center point of the floor in the PC method, PC pillar installation (①), PC beam There is no big difference in the process of installation (②), slab installation (③), reinforcement and concrete construction (④).

However, since the connection position of the upper and lower PC pillars (PC pillar product and PC pillar product) becomes the central point of the floor height, the shape of each PC pillar 10 manufactured at the factory is as shown in FIG. 5. The lower pillar 12 is connected by the connecting bar 13 exposed in the middle.

6A and 6B are perspective views illustrating the assembling structure of the PC pillar and the PC beam, which will be described below.

First, in the case of the reinforcing bar joint type, the PC beam 20 in which the empty space portion 21 is formed at a predetermined end portion is used, and the empty space of the two PC beams 20 on both sides arranged in a straight line around the PC column 10. After inserting the reinforcing bar 22 to connect between the two PC beams in the interior portion 21, and then concrete construction so that both PC beams 20 are connected by the joint reinforcing bar (22).

Next, in the case of a steel wire joint type, when the PC beam 20 is manufactured, the steel wire 23 bent and installed at the end of the PC beam is fixed and installed, and when the PC beam is assembled, the wire 23 is formed of the upper pillar 11 and the lower pillar. After being put in the space between the (12), when the slab concrete construction, the concrete is poured into the space between the two columns (11, 12), so that the PC column 10 and the PC beam 20 is integrated.

However, the PC method described above had the following problems.

First, the upper and lower pillars 11 and 12 are connected by intermediate reinforcing bars 13, such as the PC pillars having two or three-layer PC pillars or the upper and lower PC pillars connected to each other. In using the PC pillars 10 connected to each other, there is a problem that the connecting reinforcing rods 13 may not be able to withstand the load of the upper pillars 11 during or after the PC pillars 10 are vertically erected or erected. have.

As such, when the bending of the connecting reinforcing bar 13 occurs and the upper pillar 11 crosses laterally, the construction site will soon collapse, leading to a great risk of safety accident.

In addition, in supporting and installing the PC beams 20 in four directions of the PC column 10, the joint reinforcing bars 22 are connected or installed between two PC beams 20 arranged in a straight line, or in four directions. The steel wire 23 is installed in each PC beam 20 into the space between the upper and lower pillars 11 and 12, but this is after the concrete construction PC pillar 10, PC beam 20, PC beam By integrating between the 20 and the PC beam 20, there exists the danger that the PC beam 20 supported by the PC pillar 10 may fall from the PC pillar before concrete construction exists.

That is, in the case of the joint reinforcing bar 22, it is simply installed in the empty space 21 on both sides across the two PC beams 20 on both sides, or on the upper surface of the PC beam end across the two PC beams 20 on both sides. It is simply installed to be installed, and since the reinforcing bar 22 does not completely fix the two PC beams 20 to each other before concrete construction, the PC beams 20 supported on the PC columns 10 may fall. There is a risk that exists.

The joint reinforcing bar 22 is able to integrate the two PC beams 20 after the concrete is poured and cured.

In addition, in the case of the steel wire 23 is installed at the end of each of the PC beam 20, the PC beam is simply put in the space between the upper and lower pillars (11, 12) in the state that each PC beam is assembled to the PC column (10) Since only the PC beams 20 are not completely fixed to the PC pillars 10, the risk of the PC beams 20 falling down also exists.

The steel wire 23 is also capable of integrating the pillar 10 to the PC beam 20 after the concrete is poured and cured.

As such, in the connection structure of the existing precast concrete structure, the connecting bar 13 between the upper column 11 and the lower column 12 of the PC pillar 10 may bend during construction, and the pillar and the whole structure may collapse. It is a big problem that the PC beam 20, which was supported on the end of the PC pillar 10, may fall, and there is a possibility that a human accident may occur due to such a risk factor, and an improvement plan thereof is urgently needed. It is a required situation.

Accordingly, the present invention was devised to solve the above problems, and in each PC column, a support member, which is a reinforcing structure for additional bending prevention, is additionally installed on the connecting bar between the upper column and the lower column to prevent bending of the connecting bar and The pillar collapse can be prevented, and the fall of the PC beam from the PC pillar can be prevented by the two beams arranged in a straight line among the PC beams assembled on the PC pillar by mutual fixing by the bracket and the fixing rebar. The purpose is to provide a connection structure of precast concrete structure.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The present invention provides a plurality of connecting bars installed to connect between upper and lower pillars in a PC pillar, and a plurality of PC pillars installed to interconnect an end supported on an upper portion of a lower pillar in a space between the upper and lower pillars. In the connection structure of the precast concrete structure including the reinforcing bars,

The connecting rods connecting between the upper and lower pillars and forming a square array in cross section, wherein a bending preventing brace member is welded in a diagonal direction to the outside of the connecting bars positioned at each side of the square array. do.

As a preferred embodiment, a bending preventing brace member is additionally installed in a diagonal direction in the inner side of the connecting bars located on each side of the rectangular arrangement, apart from the outer brace member.

Here, the inner brace member of the connecting reinforcing bars located on each side is characterized in that it is installed so as to form a cross-shaped X shape with the outer brace member.

In addition, a bracket is fixedly installed on the bottom surface of an empty space formed at each PC beam end so that two PC beams arranged in a straight line with respect to the PC pillar are mutually fixed to each other, and between the brackets installed on both linear PC beams. A plurality of fixing reinforcing bars are characterized in that the connection is installed.

Here, the bracket is composed of a plate portion, each end of the fixing reinforcing bars are welded to the upper surface, and a plurality of rod members fixedly installed on the lower surface of the plate portion embedded in the concrete of the PC beam It features.

In addition, a bracket is fixedly installed on the upper surface of each PC beam end so that two PC beams arranged in a straight line with respect to the PC pillar are mutually fixed to each other. Reinforcing bars are characterized in that the connection is installed.

Here, the bracket is composed of a plate portion each end of the fixing reinforcing reinforcing bars welded to the upper surface, and a plurality of rod members fixedly installed on the lower surface of the plate portion embedded in the concrete of the PC beam It is done.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

The present invention relates to a connection structure of a precast concrete structure, and the connection structure between members used in the precast concrete method, that is, the PC (Precast Concrete) method, in particular, the connection structure between the upper and lower columns of the PC column and the PC column It is an improvement of the interpolation structure of two PCs arranged in a straight line.

In the connection structure of the existing precast concrete structure, the connecting reinforcing bar between the upper column and the lower column of the PC column among the precast concrete members, that is, the PC (Precast Concrete) member, may collapse during the assembly and subsequent construction. In addition, the PC beam, which was supported on the end of the PC pillar could fall, this risk can be directly connected to a human accident, the present invention is to solve the above problems.

7A and 7B are front views illustrating a connection structure between an upper pillar and a lower pillar of a PC pillar in a connection structure of a precast concrete structure according to the present invention, and FIGS. 8A and 8B are lines ′ in FIGS. 7A and 7B, respectively. A cross section taken along A-A '.

As shown, in order to prevent the connecting reinforcement 13 between the upper pillar 11 and the lower pillar 12 of the PC pillar 10 from bending under the load of the upper pillar, in the present invention, the connecting reinforcement 13 In addition, reinforcement is applied.

First, as shown in FIG. 7A, a brace member 14 is welded in a diagonal direction to the outside of the connecting rebar 13.

The support member 14 may be implemented as a length member made of steel reinforcement or other steel materials.

The bracing member 14 may be installed by welding the outer side of the connecting reinforcing bar 13 as shown in FIGS. 7A and 8A, and in the case of requiring greater supporting force, as shown in FIGS. 7B and 8B. (13) can be installed by welding the support members 14, 15 of the same shape both inside and outside.

As shown in the figure, in the conventional PC pillar 10, the connecting reinforcement 13 between the upper pillar 11 and the lower pillar 12 connects the two pillars 11 and 12 of the upper and lower layers to each other, In order to secure the space in which the end of the 20 is supported, it is installed in a structure exposed between the two pillars 11 and 12.

In addition, the connecting reinforcing bars 13 are arranged in a rectangular arrangement when viewed in cross-section between the plurality of pillars 11 and 12, as shown in Figures 8a and 8b, in the present invention, each of the supporting members 14, 15 is welded together to the connecting bars 13 located on each side in a rectangular arrangement.

As described above, the support members 14 and 15 may be diagonally installed on the connecting bars 13 positioned at each side, and may be installed outside the connecting bars 13 of each side or both inside and outside. Can be.

When the support members 14 and 15 are installed inward and outward, as shown in FIG. 7B, the two support members 14 and 15 inward and outward cross each other and cross each other, that is, form an X shape. It is desirable to be.

On the other hand, Figures 9a and 9b is a cross-sectional view of each embodiment showing the connection structure between the two PC beams arranged in a straight line centering the PC pillar in the connection structure of the precast concrete structure according to the present invention, Figures 10a and Figure 10B is a plan view of each embodiment shown in FIGS. 9A and 9B.

In FIGS. 9A and 9B and 10A and 10B, the outer and inner brace members 14 and 15 are represented by hidden lines, and in practice, the PC beam 20 is assembled in four directions about the PC column 10. However, in the drawings, only the PC beam 20 in the remaining two directions is illustrated without the illustration of the PC beam in two directions.

11A and 11B are cross-sectional views taken along the lines 'B-B' and 'C-C' of FIG. 10B, respectively, and FIGS. 12A and 12B are angles of the brackets in the connection structure between the PC beams according to the present invention. It is a perspective view which shows an Example.

As shown, in order to prevent the PC beam 20 whose end is supported on the PC pillar 10 from falling from the PC pillar, in the present invention, both sides of the PC pillar 10 are arranged in a straight line. A bracket 24 and a fixing reinforcing bar 27 for coupling two PC beams 20 together are installed.

The bracket 24 and the fixing reinforcing bars 27 are directly coupled between the ends of the two PC beams 20, and the brackets 24 are embedded at each end of the two PC beams 20 on both sides. It is fixed and installed in a state, and a plurality of fixing reinforcing bars 27 are installed between the two brackets 24 on both sides, and the two PC beams 20 are fixed to each other.

First, as shown in FIGS. 9A and 10A, in the PC beam 20 in which the empty spaces 21 are formed at both ends, the bracket 24 is fixed to the bottom of each of the empty spaces 21. do.

The bracket 24 is fixed to the plate portion 25 is welded to the fixing reinforcing reinforcing bar (27) on the upper surface, integrally installed on the lower surface of the plate portion 25 and embedded in the concrete of the PC beam 20 It consists of a plurality of rod members 26a.

The brackets 24 are installed at both ends of each PC beam 20, and the rod member 26a is embedded in concrete forming the PC beam 20 in the process of manufacturing the PC beam 20 in the factory. Bar fixedly installed at each installation position, the PC beam 20 in which the bracket 24 is installed is manufactured at the factory as a single product.

As shown in FIG. 10A, the plate part 25 may be installed in one direction so that the bracket 24 may be installed to be long in the transverse direction with respect to the longitudinal direction of the PC beam 20 (or the longitudinal direction of the fixing rebar). It is formed in a long structure, and the lower surface of the plate portion 25 has a plurality of rod members (26a) is inserted into and fixed into the concrete structure is installed in a predetermined arrangement along the longitudinal direction of the plate portion 25 have.

' 형상으로 절곡시킨 로드부재(26a)를 사용할 수 있으며, 상기 플레이트부(25) 하면에 길이방향을 따라 다수개의 로드부재(26a)를 등간격으로 용접 설치하여 브라켓(24)을 제작한다.As the rod member, as shown in Figure 12a

The rod member 26a bent into a shape may be used, and a plurality of rod members 26a are welded and installed at equal intervals on the bottom surface of the plate portion 25 in the longitudinal direction to manufacture the bracket 24.

Alternatively, as shown in FIG. 12B, a stud 26b may be used as the rod member, and a plurality of studs 26a may be welded and installed in two rows on the lower surface of the plate portion 25 in a longitudinal direction to manufacture a bracket 24. .

After fixing the brackets 24 configured as described above to the bottoms of the empty spaces 21 at both ends to produce each PC beam 20, the lower end of the column beam 12 at the construction site 12 Assembled by supporting the upper end of the, and then installed by connecting the fixing reinforcing bar 27 between the brackets 24 of the two PC beams 20 arranged in a straight line.

The fixing reinforcing bar (27) is fixed to the bracket 24 by welding a plurality of the upper surface of the plate portion 25 at predetermined intervals, both ends of each fixing reinforcing bar (27) PC beam (20) Each of the two PC beams 20 are integrally connected by the fixing reinforcing bars 27 by welding to the brackets 24.

Each of the fixing reinforcing bars 27 is assembled to the PC beam 20, that is, the end of the PC beam 20 to support the upper end of the lower pillar 12 of the PC column 10 In the installed state, the two ends of the two PC beams 20 on the brackets 24 are welded on both ends.

9B and 10B are connection structures applied to general PC beams in which no empty spaces are formed at both ends, and the brackets 24 described above are fixedly installed on the upper surfaces of both ends of each PC beam 20, and are arranged in a straight line. A plurality of fixing reinforcing bars 27 are installed between the two brackets 24 of the two PC beams 20 on each side.

9B and 10B, the mounting position of the bracket 24 is changed from the bottom of the empty space 21 to the upper surface of the PC beam 20 as compared with the embodiment of FIGS. 9A and 10A described above. All are the same except that the fixing reinforcing bar 27 is welded to the bracket 24 installed on the upper surface of the PC beam 20.

The fixing reinforcing bar 27 is installed by welding both ends on the bracket 24 of the two PC beams 20, a plurality of fixing reinforcing bar 27 is the same as the embodiment of Figures 9a and 10a described above The two PC beams 20 on both sides are integrally connected to prevent the PC beam 20 assembled on the PC column 10 from falling from the PC column 10.

In practice, the PC beam 20 in four directions is assembled around each PC column 10. In the present invention, since two PC beams 20 in a straight line are fixed to each other by the fixing reinforcing bars 27, Falling of the PC beam 20 from the PC column 10 can be effectively prevented.

In this way, in the present invention, by additionally installing the support members (14, 15), which is a reinforcement structure for additional bending prevention, in the connecting reinforcement (13) between the upper column 11 and the lower column 12 in the PC column 10 It is possible to prevent the bending of the connecting reinforcing bar 13 and to prevent the collapse of the column, and two PC beams 20 arranged in a straight line around the PC pillar 10 between the bracket 24 and the fixing reinforcing bar 27. By fixing with each other, it is possible to prevent the PC beam 20 from falling from the PC pillar 10 during construction.

As described above, according to the connection structure of the precast concrete structure according to the present invention, in each connecting column between the reinforced column between the upper column and the lower column, a reinforcing structure for preventing the bending of the additional reinforcement structure is additionally installed, Bending prevention and column collapse can be prevented, and the two PC beams arranged in a straight line among the PC beams assembled on the PC column are mutually fixed by brackets and fixing reinforcing bars so that the PC beams fall from the PC column during construction. There is an effect that can be prevented.

Claims (7)

A plurality of connecting bars installed to connect between the upper pillar and the lower pillar in the PC pillar, and a plurality of reinforcing bars installed to interconnect the PC pillars whose ends are supported above the upper pillar in the space between the upper pillar and the lower pillar. In the connection structure of the precast concrete structure, The connecting rods connecting between the upper and lower pillars and forming a square array in cross section, wherein a bending preventing brace member is welded in a diagonal direction to the outside of the connecting bars positioned at each side of the square array. Connection structure of precast concrete structure. The method according to claim 1, Connection structure of the precast concrete structure, characterized in that the bending prevention brace member is additionally installed in the diagonal direction in the inner side of the connecting bars located on each side of the rectangular arrangement separately from the outer brace member. The method according to claim 2, Connection structure of the precast concrete structure, characterized in that the inner brace member of the connecting bars located on each side is installed to form a cross-shaped X shape with the outer brace member. The method according to claim 1, The brackets are fixedly installed on the bottom of the empty space formed at each PC beam end so that the two PC beams arranged in a straight line with respect to the PC pillar are integrally interlocked with each other. Connection structure of the precast concrete structure, characterized in that the two fixing reinforcing bars are connected. The method according to claim 4, The bracket is composed of a plate portion, each end of the fixing reinforcing bars welded to the upper surface, and a plurality of rod members fixedly installed on the bottom of the plate portion embedded in the concrete of the PC beam Connection structure of precast concrete structure. The method according to claim 1, Brackets are fixedly installed on the upper surface of each PC beam end so that two PC beams arranged in a straight line with respect to the PC pillar are integrated with each other, and a plurality of reinforcing reinforcements are provided between the brackets installed on both PC beams in a straight line. Connection structure of the precast concrete structure, characterized in that the reinforcing bars are connected. The method according to claim 6, The bracket is composed of a plate portion, each end of the fixing reinforcing bars welded to the upper surface, and a plurality of rod members fixedly installed on the bottom of the plate portion embedded in the concrete of the PC beam Connection structure of precast concrete structure.

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