KR20060079949A - Hybrid structure system of precast concrete beam and steel beam, precast concrete beam with bracket for connection with steel beam - Google Patents

Abstract

According to the present invention, an improved technique for a precast concrete beam provided with a joint structural system of a precast concrete beam and a steel frame beam, and a bracket for joining a steel frame beam applied to the joint structural system is disclosed. The present invention significantly reduces the workability and economics by reducing the amount of fireproof coating work by precast concrete (PC) of steel beams of steel beams with respect to the existing steel structure that had disadvantages in construction and economics due to the fireproof coating and fireproof cover work. The joint structure system of precast concrete beam and steel frame beam which can be improved, and the precast concrete beam applied to the joint structure system is embedded in the end side for shear joint with steel frame beam. As an invention for the purpose of providing a precast concrete beam that can be achieved,

In order to achieve the above technical problem, the composite structure of the precast concrete beam and the steel frame beam provided by the present invention is a structure of a conventional building that forms and forms a frame of the structure by columns as vertical structural members and beams as horizontal structural members. A system, comprising: a plurality of pillar members placed in a predetermined position on a planar plan; A structural member installed to support the lower slab and configured to transfer a use load and a fixed load to the pillar member, wherein a plurality of steel golbos are hypothesized using a conventional steel member; And a beam member formed by pouring concrete, and a joining bracket is embedded at the end side so as to be joined to the steel frame member, and the joint is installed on the side of the steel ball so as to cross between the steel beam and the steel beam through the joining bracket. It is characterized by its basic structural features, including cast concrete beams.

Precast concrete, steel structure, fireproof coating, shear connection, bonding, bracket

Description

HYBRID STRUCTURE SYSTEM OF PRECAST CONCRETE BEAM AND STEEL BEAM, PRECAST CONCRETE BEAM WITH BRACKET FOR CONNECTION WITH STEEL BEAM}             

1 is a view showing a preferred embodiment of the joint detail of the precast concrete beam and the cheolgolbo in the composite structure of the precast concrete beam and the cheolgolbo of the present invention.

FIG. 2 is a perspective view showing the overall configuration of a precast concrete beam used in the joint embodiment shown in FIG.

3 is a view showing a detailed configuration of the bonding bracket buried in the precast concrete beam shown in FIG.

4 is a view showing another embodiment of the joint detail of the precast concrete beam and the cheolgolbo in the composite structure of the precast concrete beam and cheolgolbo of the present invention.

FIG. 5 is a perspective view showing the overall configuration of a precast concrete beam used in the joint embodiment shown in FIG.

FIG. 6 is a diagram illustrating a detailed configuration of a bonding bracket embedded in a precast concrete beam shown in FIG. 5.

7 is a view showing another embodiment of the joint detail of the precast concrete beam and the cheolgolbo in the composite structure of the precast concrete beam and cheolgolbo of the present invention.

FIG. 8 is a perspective view showing the overall configuration of a precast concrete beam used in the joint embodiment shown in FIG.

Explanation of symbols on the main parts of the drawings

1: precast concrete beam of the present invention

10, 20: bonding bracket 11: horizontal steel plate

12: vertical iron plate 12 ': exposed joint

13: copper sheet 14, 24: bolt hole

15, 25: stud bolt 21: horizontal bonded steel sheet

21 ': projecting joint 30: concrete body

32, 34: step 35: hoop muscle

50: support plate 60: support plate

65: support stiffener 100: steel ball

The present invention relates to a precast concrete beam with a pre-cast concrete beam and a steel frame beam, and a precast concrete beam having a bracket for joining the steel frame beam applied to the joint structure system, more specifically due to the fireproof and fireproof cover work Precast concrete beam and steel beam beam joining can significantly improve workability and economics by reducing the amount of fireproof coating by precast concrete (PC) of steel beams for existing steel structures that had disadvantages in constructability and economic feasibility. The present invention relates to a structural system and a precast concrete beam which can be stably joined by simple construction by embedding a joining bracket on the end side for shear joining with a steel frame beam.

Recently, in the construction field, major structural members such as strips, beams, and columns are removed from the conventional construction method based on the existing wet concrete site casting method from the viewpoint of shortening the air and improving economic efficiency by improving construction productivity. By constructing buildings by assembling them, a variety of structural forms have been applied to improve construction efficiency, ease of quality control, and reduce manpower.

Steel structure may be representatively represented as the above-described structural type, and recently, medium and large buildings of about 10 stories (about 10 floors) that are constructed in Korea are tending to be almost steel structures. As is well known, the steel structure refers to a structure formed by assembling steel members manufactured at a factory (in some cases on-site) as a main structural member of a building by a joining method such as rivets, bolts, or welding. According to the structure, it is possible to shorten the air by prefabricated construction by lifting equipment such as crane, and it is suitable for high-rise buildings and large-scale span structures, and it is free to design and internal plan, and it is easy to increase and remodel. This will be.

However, on the other hand, the steel structure has the advantages as described above, while the cost of the material is relatively high compared to other structural forms, and because of the steel material is rusted due to the rust may require appropriate antirust treatment, above all Since the steel structure is vulnerable to fire, and there is a risk of collapse in the event of fire, there is a problem that it is necessary to install fireproof coating on the outer surface of the steel member in order to prevent it. In particular, in the case of clean room facilities, such as semiconductor factories and LCD factories, where dust generation is required to be reduced, a separate fireproof cover work is performed to prevent the fireproof coatings constructed on the steel structure from falling and scattering. There is a problem that the workability and economic feasibility are remarkably deteriorated as required.

Accordingly, the present invention has been made to overcome the problems shown in the conventional steel structure form as described above, more specifically, the present invention by rationalizing the process by precast concrete of the small beams of the entire beam member in the steel structure The technical problem to be solved is to provide a new type of precast concrete beam and steel structure beam joint structure system that can significantly improve workability and economics by reducing the cost and time for fireproof and fireproof cover. do.

In addition, the present invention, as a precast concrete beam that can be preferably applied to the above-described joint structure system, since the joining bracket is embedded in the end side can be joined by a method such as steel cheolgolbo and bolting It is another technical task to provide an improved form of precast concrete beams that can be easily joined, as well as to ensure the integrity and structural stability between different dissimilar members.

In order to achieve the above technical problem, the present invention provides a joint structure system of a precast concrete beam and a steel frame beam having the following configuration, which includes a frame as a vertical structural member and a beam as a horizontal structural member. In structural system of normal building to build,

A plurality of pillar members placed in a predetermined position on a planar plan; A structural member installed to support the lower slab and configured to transfer a use load and a fixed load to the pillar member, wherein a plurality of steel golbos are hypothesized using a conventional steel member; And,

Precast concrete, which is a beam member made by pouring concrete, has a joining bracket embedded at the end side to allow joining with a steel member, and is joined to the side of the steel girder so as to cross between the steel girder and the steel golbo via the joining bracket. It is characterized by the basic configuration that the composite structure of precast concrete beam and steel frame beam made of a beam.

When comparing the composite structure of the precast concrete beam and the cheolgolbo provided by the present invention as described above as compared with the conventional general steel structure, the present invention is installed the steel girders (Girder) between the existing pillar steel and pillar steel frame Precast the small beam members installed between the girders and the girders among all the steel beams instead of the steel members for the conventional steel structure type which constituted the structural frame by installing a steel beam (Beam) between the girders. It has a structural characteristic which is distinguished from the prior art in that it is comprised using the concrete beam.

In addition, according to the present invention, it is possible to reduce the amount of fire-resistant coating-related work inevitably generated in the conventional steel frame structure and to reduce the amount of steel frame, thereby exhibiting advantageous effects such as construction cost reduction and air shortening. That is, in the case of the conventional general steel structure type, the pillars and beams (including girders and beams), which are the main structural members, are constructed by using steel members such as H-shaped steel, thereby increasing the material cost and also being susceptible to fire. Due to the nature of the need for fireproof coating and fireproof cover (for the interior of the clean room) to cover the cheolgolbo with a refractory material, there is a problem that the subsequent work volume increases and the construction cost and construction period increases.

On the contrary, according to the precast concrete beam-steel beam composite structure of the present invention as described above, the small beams having a relatively low importance in structural aspect among the steel beams constituting the existing steel structure is relatively inexpensive compared to the steel member By substituting precast concrete beams, which do not require separate fireproof coatings, material costs can be significantly reduced, while significantly reducing overall fire and fireproof cover work, reducing construction costs and reducing construction periods. It is possible to implement a rational method that can be greatly shortened.

On the other hand, there can be a variety of practical problems for the preferred embodiment of the present invention made of precast concrete beams and steel frame beams as described above, in particular in the case of the composite joint structure system provided in the present invention As the precast concrete beam member and the steel member are constructed by field assembly, the treatment details of the joints that can be integrally combined with each other are an important issue. And, in the case of such a joint detail, it should be appropriately presented in consideration of the ease and economical efficiency of the factory manufacturing for each member, the rationality of construction in the field assembly, etc., in particular, if the main characteristics of the present invention and As the joint connection is made between the concrete beams, it can be said that an appropriate structure or joint method is required to secure an integral joint between different heterogeneous members.

In the present invention, in the construction of precast concrete beams joined between steel beams, the present invention proposes a precast concrete beam in which a joining bracket is integrally embedded as a means for shear bonding with steel beams on its end side. A technique for joining a steel beam using a joining bracket of a precast concrete beam of the same configuration is proposed. At this time, as a method of joining the joining bracket and the cheolgolbo as described above, methods that are widely known as a joining method between steel members, such as welding or bolted joint, high-strength bolted joint, etc. may be suitably used according to a specific design In a general case, bolted joint may be applied as the most preferable jointing method in view of construction convenience and joint ductility.

Hereinafter, with reference to the accompanying drawings will be described embodiments in which the present invention is preferably implemented through the present invention will be described in more detail. However, this is intended to enable those of ordinary skill in the art to more clearly understand and easily practice the present invention, and are not intended to limit the scope of the present invention to the following matters. Still other technical features and advantages of the above will be more clearly understood by those skilled in the art through the following description of the preferred embodiment according to the present invention.

Example 1

Figure 1 is a view showing a preferred embodiment of the joint detail of the precast concrete beam and the cheolgolbo in the composite structure of the precast concrete beam and cheolgolbo of the present invention, Figure 2 is used in the joint embodiment as described above Figure 3 is a perspective view showing the overall configuration of the precast concrete beam, Figure 3 is a view showing a detailed configuration of the bonding bracket embedded in the precast concrete beam shown in FIG.

1 to 3, the precast concrete beam 1 according to a preferred embodiment of the present invention is a concrete body 30 made by pouring concrete as a whole and a bonding bracket embedded in both ends of the concrete body 30 It can be seen that it comprises (10). Here, the concrete body 30 is formed in the shape of a beam having a uniform cross section (normally rectangular cross section) as a whole, the end portion 32 is formed so that the lower side protrudes more than the upper side It is.

In addition, the joining bracket 10 is integrally installed at the end side of the concrete body 30 and functions as a means for connecting and joining with the cheolgolbo 100. In this embodiment, the joining bracket 10 is shown in FIG. As shown in detail in 3, it comprises a horizontal iron plate 11 installed along the longitudinal direction of the beam while being parallel to the ground as a whole and a vertical iron plate 12 vertically installed on the upper surface of the horizontal iron plate 11 do. In addition, the both sides of the horizontal iron plate 11 is formed so that the copper iron plate 13 is protruded in a right angle direction so that the vertical iron plate 12 and the copper iron plate 13 in a planar view to form a cross-shaped arrangement It is configured to be installed on the horizontal iron plate (11).

Here, the joining bracket 10 is installed on the end side of the precast concrete beam 1 so that the horizontal iron plate 11 is located at the height of the stepped portion 32 of the concrete body 30 and the molten iron plate Since one surface of the 13 is installed to be substantially coincident with the upper surface of the stepped portion 32 of the concrete body 30, the vertical steel plate 12 placed on the horizontal steel plate 11 is exposed to the outside of the beam by a predetermined length so that the exposed joint is exposed. 12 'can be formed. The exposed joint portion 12 ′ exposed to the outside of the beam as described above performs a function as a connecting portion that allows the precast concrete beam 1 of the present invention to be integrally bonded to the cheolgolbo 100. As a preferred example for the present embodiment, the connection by bolted joint is held.

To this end, the exposed joint 12 'is configured to form a plurality of bolt holes 14 for joining with the cheolgolbo as shown in Figure 3, and, as can be seen from the figure of Figure 1 On the web side of the cheolgolbo 100, a longitudinal stiffener 120 is installed on the web side between the stiffener 120 of the cheolgolbo 100 and the exposed bracket 12 'of the joint bracket of the precast concrete beam 1 As a separate connecting iron plate member, the connecting iron plate 200 is overlapped so as to be joined by bolting.

On the other hand, the joining bracket 10 is manufactured by welding using an iron plate commonly used in terms of material, and pre-installed with a joining bracket according to the present invention by embedding it in the concrete body 30 Can make concrete beams At this time, as described above, in the present invention, the joint connection of the precast concrete beam 1 and the steel frame 100 is made by a joint bracket 10 embedded at the end of the beam, and the load applied to the beam after construction is the joint. It is delivered to the cheolgolbo 100 through a shear connection with the bracket 10, in this regard the bonding bracket 10 must be firmly coupled to the concrete body 30 for structural stability Required. Therefore, it is preferable to install a shear connector in the bonding brackets in the concrete body 30 in order to enhance adhesion to concrete. As such a shear connector, as shown in FIG. Similarly, it is suitable to weld the normal stud bolt 15 by welding.

On the other hand, the identification code 50 in Figure 1 shows a support plate installed on the web side of the cheolgolbo 100, by installing the support plate 50 such as to install the construction of the precast concrete beam 1 according to the present invention The construction and accuracy can be improved. That is, in the actual construction of the precast concrete beam (1) of the present invention precast concrete beam (1) on the support plate 50 is welded to protrude outward on the side of the cheolgolbo (1) web as shown in Figure 1 When connecting the joining bracket 10 and the cheolgolbo (1) in a temporarily mounted state to be able to work in a stable state bar construction has an advantage that can be easier to work and improve the work efficiency. At this time, since the support plate 50 corresponds to a means for temporarily mounting until the precast concrete beam 1 is completely fixed, it is necessary to use a thicker steel plate than necessary or additional fireproof coating or the like. Will not be.

Example 2

4 to 6 are views showing another embodiment of the composite structure formed by joining the precast concrete beam of the present invention to the cheolgolbo, Figure 4 is a precast concrete beam in the precast concrete beam-cheolgolbo composite structure of the present invention Figure 5 is a view showing another example of the joint detail of the cheolgolbo, Figure 5 is a perspective view showing the overall configuration of the precast concrete beam used in the joint embodiment as described above, Figure 6 is a pre-shown in Figure 5 The figure which shows the detailed structure of the joining bracket embedded in the cast concrete beam.

4 to 6, the precast concrete beam 1 according to the present embodiment as a whole, the concrete body 30 made by pouring concrete and the joints are embedded in the lower end of both ends of the concrete body 30 It can be seen that including the bracket 20. At this time, the bonding bracket 20 is composed of a horizontally bonded iron plate 21, which is a flat member having a long length as shown in Figures 5 and 6, the horizontal bonded iron plate 21 is the concrete body ( By having a length longer than the width of 30) is provided so that the protruding joint portion 21 'protruding more than a predetermined length to both sides of the concrete body 30 in the installed state.

In addition, the horizontal bonded steel sheet 21 is embedded in the concrete body 30 in order to increase the adhesive force with the concrete to rest in order to stably transfer the load acting on the precast concrete beam (1) to the cheolgolbo 100 It is preferable to install the connector 25, in which the stud bolts can be welded and used as the sheer connector as described above in the first embodiment.

In addition, as shown in FIGS. 5 and 6, it is preferable that the bolt hole 24 is formed in the protruding joint part 21 'to allow the bolted joint with the cheolgolbo 100. At this time, the bolt holes as described above may be presented as a more preferable configuration to be able to absorb some manufacturing and construction deviations that may occur in the actual construction by being formed in a long hole (長 空 形) as shown.

FIG. 5 is a view showing details of a joint part in which the precast concrete beam 1 having the configuration as shown in FIG. 6 is connected to the cheolgolbo 100 in detail. Referring to FIG. 6, in the case of the joint detail according to the present embodiment, the support plate 60 is installed on the web side of the cheolgolbo 100 so as to protrude outward in the horizontal direction and FIG. 6 is mounted on the support plate 60. In the state of mounting the precast concrete beam (1) of the type shown in Figure 2 by fixing the horizontal joints of the precast concrete beam (21) protruding joint portion 21 'to the support plate 60 It can be seen that the joint connection between the members is made.

Here, as the method of fixing the protruding joint 21 'to the support plate 60, various methods known as joining methods between welding and other steel members may be applied, but as described above, the protruding joint 21 Forming a long bolt hole (24) in the ') through this through the bolt joint can be said to be more preferable in terms of convenience and economical construction.

On the other hand, in the joint detail according to the present embodiment, the support plate 60 is installed on the web of the cheolgolbo 100 to support the precast concrete beam 1 of the present invention, the support plate 60 is Compared with the backing plate 50, which is a temporary mounting means in the first embodiment described above, it actually functions as a shear support means for supporting the load received by the precast concrete beam 1 and transferring it to the steel beam 1 Seems to make a difference. That is, in the case of the joint structure shown in Figure 1, the load transmission is transmitted to the cheolgolbo 100 through the coupling portion between the bonding bracket 10 and the cheolgolbo 100 and the support plate 50 is precast concrete beam ( 1) was only functioning as a pedestal for temporarily mounting, whereas in the present embodiment, the support for the precast concrete beam 1 is basically made by the support plate 60 described above and the support plate ( 60) and the load transfer is made through the shear coupling portion of the cheolgolbo (100).

Therefore, in the present embodiment, the support plate 60 should be appropriately designed to secure structural stability in view of the above, and in this embodiment, the support stiffener 65 is provided under the support plate 60 for this purpose. Is installed to support the load applied to the support plate 60 more stably. Such support stiffener 65 can be configured by welding a conventional structural steel plate to the cheolgolbo 100, the installation interval is to be arranged at an appropriate interval according to the load conditions.

Example 3

7 and 8 are views showing another embodiment of a composite structure formed by joining a precast concrete beam of the present invention to a steel frame, Figure 7 is a precast concrete beam in the precast concrete beam-steel frame composite structure of the present invention And another example of the joint detail of the cheolgolbo, Figure 8 is a perspective view showing the overall configuration of the precast concrete beam used in the joint embodiment as described above.

Referring to FIG. 8, the precast concrete beam 1 according to the present embodiment has a configuration substantially the same as that of the precast concrete beam of the type shown in FIG. 5, such as the shape of the joining bracket 20. In the end shape, the stepped portion 34 is formed on the upper side, and is distinguished from the precast concrete beam of Embodiment 2 described above in terms of its configuration.

That is, according to Fig. 8, the stepped portion 34 is formed on the upper side of the precast concrete beam 30 in the present embodiment, cut out by a predetermined length in the horizontal direction from the end portion. On the lower side, it can be seen that the bonding brackets 20 having the same shape as in Embodiment 2 described above are buried. Here, the joining bracket 20 is a buried installation to protrude a predetermined length or more to the both sides of the concrete body 30 as shown in the horizontal bonded iron plate 21 as shown in the specific details of the joining bracket shown in FIG. Since the same thing, repeated description thereof will be omitted.

Figure 7 shows another example of the connection details of the precast concrete beams and steel frame beams according to the present invention, which also has almost the same configuration as the connection details shown in Figure 4, but the precast concrete beams (1) There are some differences in the specific form of), which show differences in terms of their joint details and their effects.

That is, referring to the illustration of FIG. 7, the joining details according to the present embodiment are laid out so as to protrude the support plate 60 on the side of the cheolgolbo 100 as a whole, precast end supported by the support plate 60 By bonding the fixing bracket 20 of the concrete beam 1 with the support plate 60, there is a common point in common with the second embodiment in that the bonding construction between the beam members is made. However, in the case of the precast concrete beam used in the present embodiment as shown in Figure 8 has a stepped portion 34 of the shape that is constantly cut on the upper end side of the bar support plate (60) When installed on the upper part, it is possible to install the precast concrete beam 1 closer to the cheolgolbo 100 due to the stepped portion 34 as described above.

In other words, in the case of a beam having a general end shape, such as in a precast concrete beam of the type shown in FIG. 5, if the top height of the beam is positioned higher than the upper flange height of the steel frame 100 in its installed state, Due to the interference of the upper flange, the concrete beam can not be installed closer than the side end position of the upper flange toward the cheolgolbo (100). Accordingly, the length of the support plate 60 supporting the precast concrete beam 1 is also increased, so that the amount of material required is increased, and the moment acting on the support plate 60 due to the load of the beam is also significantly increased. There is a disadvantage.

In contrast, in the present embodiment, as shown in FIG. 7, the stepped portion 34 is constantly formed on the upper end side of the precast concrete beam 1, and the cheolgolbo 100 is installed in the bar. Since the upper flange (UF) of the upper portion of the stepped portion 34 is to be able to install the precast concrete beam 1 as close as possible to the steel frame (1) side without interference of the upper flange. Therefore, according to the characteristic configuration of this embodiment, it is possible to reduce the size of the support plate 60 for supporting the precast concrete beam 1, as well as to act on the support plate 60 in terms of structure. Since the moment can be reduced, there is an effect that can achieve a more stable bonding.

Meanwhile, referring to the drawings of the precast concrete beams shown in FIGS. 2, 5 and 8, the so-called half-free, in which the hoop 35 (HOOP) root is exposed to protrude from the upper surface of the concrete body 30, is exposed. It can be seen that it is made of cast concrete beams. As is well known, this is to increase the structural integrity in forming the slab structure by placing slab concrete on the upper part thereof, which is merely an example of a precast concrete beam, It will be apparent to those skilled in the art that modifications can be made to the PC beam or other forms.

Although the present invention has been described in detail by the embodiments described above, those skilled in the art to which the present invention pertains will be capable of various substitutions, additions and modifications without departing from the technical spirit described above. It is to be understood that such modified embodiments are also within the protection scope of the present invention as defined by the appended claims below.

According to the present invention described in detail above by rationalizing the method by precast concrete of the small beams of the entire beam member with respect to the existing general steel structure by significantly reducing the cost and time required for fireproof coating and fireproof cover There is an effect that can improve the workability and economics. Therefore, the present invention is expected to be actively used in high-tech facility construction that requires a lot of construction costs related to fireproof coating, such as fireproof cover according to the demand for reducing the internal dust generation, such as semiconductor factory or LCD factory.

Claims (27)

In a structural system of a conventional building in which a frame of a structure is formed by a pillar as a vertical structural member and a beam as a horizontal structural member, A plurality of pillar members placed in a predetermined position on a planar plan; A structural member installed to support the lower slab and configured to transfer a use load and a fixed load to the pillar member, wherein a plurality of steel golbos are hypothesized using a conventional steel member; And, Precast concrete, which is a beam member made by pouring concrete, has a joining bracket embedded at the end side to allow joining with a steel member, and is joined to the side of the steel golbo to cross between the steel golbo and the steel golbo via the joining bracket. Bo; Synthetic structure of precast concrete beam and steel frame beam comprising a. In claim 1, Both ends of the precast beam is formed with a stepped portion so that the lower side protrudes more than the upper side, The joining bracket is a horizontal iron plate parallel to the ground at the height of the stepped portion of the precast beam and installed along the longitudinal direction of the beam; A vertical iron plate which is vertically erected on an upper surface of the horizontal iron plate and has an exposed joint portion exposed to the outside of the beam by a predetermined length of the entire length; The precast concrete beam is connected to the side of the cheolgolbo in the exposed joint of the vertical steel plate, the composite structure of the precast concrete beam and cheolgolbo, characterized in that bonded to the web of the cheolgolbo. The method of claim 2, wherein the exposed joint of the vertical steel plate is formed with a bolt hole for the bolt joint with the cheolgolbo, the precast concrete beam is a composite of pre-cast concrete beam and cheolgolbo, characterized in that connected by the cheolgolbo bolt connection rescue. In claim 3, wherein the web side of the cheolgolbo is further provided with a longitudinal stiffener joint, when connecting the precast concrete beam to the cheolgolbo overlap the connecting steel plate as a separate member between the joint stiffener and the exposed joint of the joint bracket Composite structure of precast concrete beams and cheolgolbo characterized in that the joining is made by bolting. 3. The precast concrete of claim 2, wherein a side of the vertical steel plate is further formed such that a molten iron plate protrudes in a right angle direction, and the molten iron plate is embedded in the beam so that one plane thereof is exposed to the outer surface of the beam. Composite Structure of Beams and Steel Beams. The composite structure of the precast concrete beam and the cheolgolbo is characterized in that the shear connector for increasing the adhesion to the concrete is further installed at the portion of the horizontal steel plate and the vertical steel plate embedded in the precast concrete beam . 7. The composite structure of precast concrete beams and steel ball beams according to claim 6, wherein the sheer connector is a stud bolt. According to any one of claims 2 to 7, The web side of the cheolgolbo is further formed with a support plate to protrude horizontally outward, characterized in that the lower end of the precast concrete beam is mounted on the top of the support plate Composite structure of precast concrete beam and steel frame beam. The support plate is integrally formed on the web side of the cheolgolbo to protrude horizontally outward, The joining bracket is a flat member which is installed on the lower side of the precast concrete beam, a horizontal bonded steel plate formed with a protruding joint to protrude to both sides of the precast concrete beam; The precast concrete beam is a composite structure of the precast concrete beam and the cheolgolbo characterized in that the lower end portion is mounted on the upper side of the support plate by the joint between the projecting joint of the horizontal bonded steel plate and the support plate. 10. The method of claim 9, wherein the protruding joint of the joining bracket is formed with a bolt hole for the bolt joint with the cheolgolbo, and the protruding joint of the precast concrete beam is connected to the support plate of the cheolgolbo by the bolt joint Composite structure of cast concrete beam and steel frame beam. The composite structure of precast concrete beams and cheolgolbo, characterized in that the bolt hole is formed in a long hole shape. 12. The composite structure of precast concrete beams and cheolgolbo according to claim 11, wherein a sheer connector is further installed at a portion embedded in the precast concrete beam of the horizontal bonded steel sheet to increase adhesion with concrete. 13. The composite structure of precast concrete beams and steel ball beams according to claim 12, wherein the sheath connector is a stud bolt. 10. The method of claim 9, wherein the upper side of the precast concrete beam, the stepped portion is formed to be cut by a predetermined length horizontally from the end and at the same time, the upper flange of the steel cheolgolbo in the state in which the precast concrete beam is bonded to the steel cheolbo Composite structure of precast concrete beam and steel frame beam, characterized in that the installation is located on the upper side of the stepped portion. The composite structure of precast concrete beams and cheolgolbo according to any one of claims 9 to 14, wherein a support stiffener is further installed on the lower side of the cheolgolbo to support the lower portion of the support plate. In the precast concrete beam is formed integrally embedded with a bonding bracket on the end side to be joined to the side of the cheolgolbo, A concrete body having a stepped portion formed in the form of a beam member by pouring concrete, the end of which protrudes a predetermined length from a lower side than an upper side; A horizontal iron plate parallel to the ground and installed along the longitudinal direction of the beam at the height of the stepped portion of the concrete body; A vertical bracket formed vertically on the upper surface of the horizontal iron plate and having an exposed joint portion exposed to the outside of the beam by a predetermined length of the entire length;  Precast concrete beam is provided with a bracket for joining steel cheolgolbo configured. 17. The precast concrete beam having a bracket for joining a cheolgolbo according to claim 16, wherein a bolt hole for bolting to the cheolgolbo is formed in the exposed joint of the vertical steel plate. 18. The method of claim 16 or 17, wherein the side of the vertical iron plate is further formed so that the copper iron plate protrudes in a right angle direction, the copper iron plate is buried in the inside of the beam so that one plane thereof is exposed to the outside of the beam Precast concrete beam with bracket for joining steel cheolgolbo. 18. The method of claim 16 or 17, wherein the horizontal plate and the vertical plate is embedded in the concrete beam portion is provided with a sheer connector for connecting the cheolgolbo characterized in that the sheer connector is further installed to increase the adhesion to the concrete Precast concrete beams. 20. The precast concrete beam provided with a cheolgolbo joining bracket according to claim 19, wherein the sheer connector is a stud bolt. In the precast concrete beam is formed integrally embedded with a bonding bracket on the end side to be joined to the side of the cheolgolbo, A concrete body formed in the form of a beam member by pouring concrete; And, A joining bracket comprising a horizontally-jointed iron plate having protruding joints formed to protrude to both sides of the concrete body as a flat member embedded in a lower side of the concrete body; Precast concrete beams with bracket for joining steel beam beams, including steel beams. 22. The precast concrete beam provided with a bracket for joining a cheolgolbo, characterized in that a bolt hole for bolting a cheolgolbo is formed in the protruding joint of the horizontal bonded steel plate. 23. The precast concrete beam having a bracket for joining cheolgolbo according to claim 22, wherein the bolt hole is formed in a long hole shape. 22. The precast concrete beam provided with a cheolgolbo joining bracket according to claim 21, wherein a sheer connector is further installed at a portion embedded in the concrete body of the horizontal bonded steel sheet to increase adhesion to concrete. 25. The precast concrete beam provided with a cheolgolbo joining bracket according to claim 24, wherein the sheer connector is a stud bolt. 26. The precast device according to any one of claims 21 to 25, wherein the precast concrete beam is further formed with a stepped portion formed in a shape cut horizontally from an end by a predetermined length on an upper side of the precast concrete beam. Concrete beams. 22. The precast concrete beam provided with a bracket for joining a cheolgolbo according to claim 16 or 21, wherein the concrete body is a half precast concrete beam formed by exposing a hoop muscle to an upper surface thereof.

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