KR100496196B1 - Composite Beam Stiffened with Prestressed Concrete Panel having Novel Connecting Structure and Connecting Assembly therefor - Google Patents

Abstract

The present invention relates to a precast concrete panel composite beam having a prefabricated concrete panel and a steel beam more rigidly connected to be able to be completely structurally integrated, and easy to assemble a precast concrete panel composite beam and a beam connection assembly used therein will be.

In the present invention, the composite beam of the steel beam and the precast concrete panel is integrally assembled, the precast concrete panel, the lower plate is provided with a plurality of studs and a fastening plate made of a pair of steel plates perpendicular to the upper surface The connection bottom plate is integrally provided, and the upper part is coupled to the connection bottom plate, and the lower part is connected to the beam connecting assembly consisting of a loop reinforcement embedded in the precast concrete panel, the lower end of the steel beam to the fastening plate By inserting and fastening integrally with the connecting bottom plate by fastening means, there is provided a precast concrete panel composite beam and a beam connecting assembly used therein, characterized in that the steel beam is assembled and synthesized integrally with the precast concrete panel. . .

Description

Composite beam stiffened with prestressed concrete panel having novel connecting structure and connecting assembly therefor}

The present invention relates to a precast concrete panel composite beam having a novel structure of beam connection assembly, which allows precast concrete panels and steel beams to be assembled in a simple and robust manner, and an assembly structure using such a beam connection assembly.

Precast concrete panel (hereinafter referred to as "PC panel") The composite beam is composed of a structure in which a precast concrete panel in which prestress is introduced by a tension of steel wire and an I-type steel beam are assembled.

As described above, since the precast concrete panel composite beam is a composite of the type I steel beam and the precast concrete panel, it is absolutely important to make the type I steel beam and the PC panel firmly connected to each other to structurally act integrally. Do.

Patent Application No. 2000-54489 discloses an example of a precast concrete panel composite beam in which prestress is introduced, wherein the connection structure between the precast concrete panel and the I-type steel beam is adopted as shown in FIGS. 6A to 6C. .

In short, as shown in FIG. 6A, a plate 21 having a stud 22 at the bottom thereof is installed on the upper surface of the precast concrete panel 20, and the lower flange 11 of the I-type steel beam 10 is provided. And the plate 21 are connected to each other to connect the type I steel beam and the precast concrete panel 20.

In the connection structure shown in FIG. 6B, the plate 21 and the high tension bolt 23 are installed upward on the upper surface of the precast concrete panel 20 without having a stud on the lower portion of the plate 21. The high tension bolt 23 is passed through the lower flange 11 of the I-type steel beam 10 to be fastened.

Meanwhile, in the connection structure shown in FIG. 6C, the U-shaped rebar 24 is installed in the precast concrete panel 20, and the end of the rebar 24 passes through the lower flange 11 of the I-type steel beam 10. The structure is fastened.

In the conventional connection structure as described above, there are the following problems.

First, as shown in FIG. 6A, when welding the plate 21 and the lower flange 11 of the I-type steel beam 10, the plate 21 made of steel expands by the heat of welding so that the plate 21 is formed around the plate 21. The probability of cracking in concrete is very high. The cracking of the concrete around the plate 21 results in the plate 21 and the precast concrete panel 20 becoming unintegrated, resulting in the type I steel beam 10 and the precast concrete panel. A composite beam is created in which 20 is not structurally integrated.

On the other hand, in the assembly structure of FIG. 6B, since the plate 21 is only coupled with the precast concrete panel 20 only by the bolt 23, the I-type steel beam 10 and the precast concrete panel 20. ) Is very fragile, so that the type I steel beam 10 and the precast concrete panel 20 cannot be structurally integrated.

In the assembly structure of FIG. 6c, since the lower flange 11 of the I-type steel beam 10 and the upper surface of the precast concrete panel 20 directly contact each other without the plate 21, this connection is also not firm. It is not structurally integrated. In particular, the lower flange 11 and the upper surface of the precast concrete panel 20 are not in contact with any adhesive force, but only faced by the vertical force by the reinforcing bars 24 and the nut fastening them, so that the lower flange When the gap between the 11 and the upper surface of the precast concrete panel 20 is generated, rainwater may be injected, and when the fixed state of the end of the reinforcing bar 24 is loosened due to the vibration load applied to the beam, the lower flange There is a problem that the gap between the upper surface of the 11 and the precast concrete panel 20 becomes larger and the likelihood of damage to each other is very high.

The present invention was developed to overcome the shortcomings and limitations of the prior art as described above, in the present invention, the precast concrete panel and the steel beam is more firmly connected to the assembly structure that can be structurally completely integrated behavior It is an object to provide a precast concrete panel composite beam having a beam and a beam connection assembly used therein.

In particular, it is an object of the present invention to provide a precast concrete panel composite beam having an assembly structure in which the precast concrete panel and the steel beam can be assembled in a simple manner, and a beam connecting assembly used therefor.

In the present invention, in order to achieve the above object, as a composite beam of a structure in which the steel beam and the precast concrete panel is integrally assembled and synthesized, the precast concrete panel, the lower surface is provided with a plurality of studs, The connection bottom plate is integrally provided with a fastening plate made of a pair of vertical steel plate, and the beam connection assembly consisting of a loop reinforcing bar is embedded in the upper part and the lower part is embedded in the precast concrete panel, Precast concrete panel composite, characterized in that the abdominal lower end of the steel beam is inserted into the fastening plate and fastened integrally with the connecting bottom plate by the fastening means, the steel beam is assembled and synthesized integrally with the precast concrete panel A beam is provided.

In a specific embodiment of the present invention, the loop reinforcement embedded in the precast concrete panel may be bound to the transverse rebar present in the precast concrete panel or may function as a transverse reinforcement, and as the steel beam, the abdomen A honeycomb girder type I steel beam formed with a trapezoidal cutout at predetermined intervals may be used.

Further, in the composite beam of the present invention, a thick plate for securing a thickness having a predetermined thickness is provided between the connecting bottom plate and the upper surface of the roof reinforcement, or the upper surface of the connecting bottom plate is lower than the upper surface of the precast concrete panel. Placing concrete in the state positioned to be coupled to the precast concrete panel and the connecting bottom plate, the upper surface of the connecting bottom plate may be further provided with a structure to secure the covering thickness of the roof reinforcement by filling the mortar.

Next, the configuration of the present invention will be described by referring to specific embodiments of the present invention with reference to the accompanying drawings.

1 is a honeycomb girder type beam 10 having a trapezoidal cutout portion 14 formed in an abdomen 12 of an I-type steel beam 10 as an embodiment of the present invention. A schematic perspective view of a composite beam coupled to a precast concrete panel 20 by an assembly structure according to FIG. 2 is shown, and in FIG. 2, a schematic lateral cross-section along line AA of FIG. 1 is shown.

In FIG. 1 and FIG. 2, the assembly structure of the portion C to which the I-type steel beam 10 and the precast concrete panel 20 are coupled will be omitted because it will be described in detail with reference to the following description and drawings.

In the present invention, the I-shaped steel beam 10 coupled to the precast concrete panel 20 is composed of an upper flange 11 and the abdomen 12, the lower flange as in a typical I-shaped steel beam is provided Not. The beam connecting assembly 30 to be described later is integrally installed on the upper surface of the precast concrete panel 20, and the lower part of the abdomen 12 of the I-type steel beam 10 is assembled to the beam connecting assembly 30 so that I The steel beam 10 and the precast concrete panel 20 are integrally coupled. In the drawing, as an example of the I-shaped steel beam 10, a honeycomb girder type beam is formed in the abdomen 12 with a trapezoidal cutout portion 14 formed at a predetermined interval. In the case of the honeycomb girder type beam as described above, By cutting away a portion of the abdomen of the beam of relatively low structural importance, the amount of steel used is reduced, thereby reducing costs and weight.

However, the honeycomb girder-type beam is just one example, and the assembly structure of the beam and the precast concrete panel presented in the present invention is not only applied to the honeycomb girder-type beam, but is applied to various types of steel beams. It can be.

Next, the assembly structure of the beam and the precast concrete panel will be described in detail by looking at the embodiment configuration of the beam connection assembly used in the assembly structure in detail.

Figure 3a is a schematic perspective view of one embodiment of the beam connection assembly 30 according to the present invention, Figure 3b is a line BB of Figure 1 showing the assembly structure using the beam connection assembly 30 shown in Figure 3a According to the cross-sectional view. FIG. 3C is a view similar to FIG. 3B, showing a cross-sectional view of another embodiment of the assembly structure using the beam connection assembly 30.

The beam connection assembly 30 is installed integrally coupled to the concrete of the precast concrete panel 20 and is connected to the lower end of the abdomen 12 of the I-type steel beam 10 to form the precast concrete panel 20 and the I type. It is provided with a connection bottom plate 31 made of steel for connecting the steel beam 10 integrally. The bottom surface of the connection bottom plate 31 is provided with a plurality of embedded studs 35 to be embedded in the concrete, the upper portion of the abdomen 12 of the I-type steel beam 10 is inserted into the fastening means 36 such as high-tensile bolts Fastening plate 32 for fixing the abdomen 12 by the () is provided integrally. The fastening plate 32 is erected to face each other at intervals corresponding to the thickness of the abdomen 12 of the I-type steel beam 10 to be connected and a pair extending in the longitudinal direction of the I-shaped steel beam (10) It consists of vertical steel plates. The fastening plate 32 is attached to the connecting base plate 31 by a method such as welding when manufacturing the beam connection assembly 30 in the factory.

The fastening plate 32 is formed with a plurality of fastening holes for inserting the fastening means 36, such as high-tensile bolts, the fastening hole is also corresponding to the lower end of the beam abdomen 12 is inserted into the fastening plate 32 Formed. The fastening hole may be changed to a two-row arrangement, a three-row arrangement, etc. in addition to the one-row arrangement according to the structural calculation.

In order to further secure the coupling of the connection bottom plate 31 and the precast concrete panel 20, the beam connection assembly 30 has a plurality of loops connected to the connection bottom plate 31 and embedded in the precast concrete panel 20. Reinforcing bar 33 is provided. In the embodiment shown in Figures 3a to 3c, the roof reinforcement 33 is at least partially attached to the lower surface of the connecting bottom plate 31 by spot welding or the like. Meanwhile, the roof reinforcement 33 is embedded in the concrete of the precast concrete panel 20. As such, the roof reinforcement 33 has a lower portion of the precast concrete panel 20 with its upper end connected to the connection bottom plate 31. Since it is embedded in the concrete of the fixed, the beam connection assembly 30 is more firmly combined with the precast concrete panel 20 to form an integral.

In particular, as shown in FIG. 3B, the lower part of the roof reinforcing bar 33 is disposed in the precast concrete panel 20 by a method of joining the wires using the binding line 37 or welding, and the transverse reinforcing bar 23. When connected, the lower end of the roof reinforcement 33 can be more firmly embedded in the concrete of the precast concrete panel 20.

On the other hand, instead of connecting the loop reinforcement 33 with the transverse reinforcement 23 of the precast concrete panel 20, the roof reinforcement 33 functions as a transverse reinforcement, as shown in FIG. 3C. It is possible. In other words, the transverse reinforcing bar 23 is made larger at the position where the connecting bottom plate 31 is provided, and the upper end portion thereof is coupled with the connecting bottom plate 31 to function as the roof reinforcing bar 33.

Figure 4 shows a schematic perspective view of another embodiment of the beam connection assembly 30 according to the invention, compared with the embodiment shown in Figure 3a, in the embodiment shown in Figure 4 loop rebar The structure in which 33 is coupled to the connecting bottom plate 31 is modified.

In other words, as shown in Figure 4, by forming a coupling hole 34 on the side of the connecting base plate 31, by inserting the ends of the loop reinforcement 33 in each coupling hole 34, the loop reinforcement ( 33) and the connection base plate 31 can be combined. Also in this case, the loop reinforcement 33 can be engaged with the transverse reinforcement 23 as described above, and as shown in FIG. 3C, the transverse reinforcement 23 is greatly expanded to cut the end thereof, and then the connecting bottom plate ( It is also possible to insert into the side engaging hole 34 of 31).

Next, a method of constructing a precast concrete panel composite beam according to the present invention using the beam connection assembly 30 described above will be described.

First, the fastening plate 32 and the stud 35 are integrally attached to the connecting bottom plate 31, and the loop reinforcing rod 33 is connected to the connecting bottom plate 31, thereby as shown in FIGS. 3A and 4. The same beam connection assembly 30 is fabricated. The pre-fabricated beam connection assembly 30 is placed in the formwork for manufacturing the precast concrete panel 20 and concrete is cast to precast the beam connection assembly 30 with the precast concrete panel 20. The concrete panel 20 is manufactured. At this time, in the case of the embodiment shown in Figure 3b, the transverse reinforcing bar 23 and the roof reinforcing bar 33 of the beam connection assembly 30, which was reinforced to the formwork before placing concrete, bind the embodiment shown in Figure 3c In the case of the example, the greatly expanded transverse rebar is coupled with the connecting bottom plate 31 by spot welding or the like, or the loop reinforcing bars 33 previously joined to the connecting bottom plate 31 are arranged as the transverse rebars.

Arrangement of the steel wire in the precast concrete panel 20 and the introduction of the prestress stress by the tension of the steel wire can be used a general known method, a detailed description thereof will be omitted.

When manufacturing the precast concrete panel 20 by pouring concrete with the beam connection assembly 30 installed, in some cases, the coating thickness of the roof reinforcement 33 may not be sufficiently secured. 5A and 5B are cross-sectional views as shown in FIGS. 3B and 3C, which show a structure for securing the coating thickness of the roof reinforcement 33. As shown in FIG.

If the cover thickness of the roof reinforcement 33 is not sufficiently secured, a thick plate 38 for securing the cover thickness may be disposed between the connecting bottom plate 31 and the roof reinforcement 33 as shown in FIG. 5A. That is, the upper and lower surfaces are respectively attached to the connecting bottom plate 31 and the roof reinforcement 33, and the thick plate 38 for securing the coating thickness is present between the connecting bottom plate 31 and the roof reinforcing bar 33. By doing so, the position of the roof reinforcement 33 is further lowered to the lower side, thereby ensuring an appropriate coating thickness for the roof reinforcement 33.

Alternatively, as shown in FIG. 5B, the beam connection assembly 30 is pre-filled by pouring concrete while the upper surface of the connecting bottom plate 31 is positioned below the upper surface of the precast concrete panel 20. It is combined with the cast concrete panel 20, and filled with mortar or the like on the upper surface of the connecting bottom plate 31 placed below to secure an appropriate coating thickness for the roof reinforcing bar (33). Although FIG. 5B illustrates a structure for securing the coating thickness with respect to the beam connection assembly 20 illustrated in FIG. 4, the structure for securing the coating thickness may be applied to the beam connection assembly 20 illustrated in FIG. 3A. have.

In the same manner as above, after the precast concrete panel 20 is manufactured in a factory or a bridge adjacent site workshop with the beam connection assembly 30 integrally coupled, the precast concrete panel 20 is moved to the site and mounted. (For example, in the case of bridge construction, the precast concrete panel 20 is mounted between the bridge and the bridge or between the bridge and the bridge).

After mounting the precast concrete panel 20, the lower part of the abdomen 12 of the I-shaped steel beam 10 with the lower flange removed is inserted between the fastening plates 32 of the beam connection assembly 30. By fastening by inserting the fastening means 36 in the fastening hole, the I-shaped steel beam 10 and the beam connection assembly 30 are assembled to synthesize the beam 10 and the precast concrete panel 20 integrally. will be.

On the other hand, as another construction method, by inserting the lower end of the abdomen of the steel beam 10 to the fastening plate 32 of the beam connection assembly 30 in the precast concrete panel 20 manufactured in the factory or bridge adjacent site workshop By fastening by the fastening means 36, after the steel beam 10 and the precast concrete panel 20 is integrally synthesized, the synthesized beam may be moved to a bridge construction site and mounted.

According to the present invention as described above, by inserting the lower end of the abdomen of the I-beam steel beam 10 into the beam connection assembly 30 integrally provided in the precast concrete panel 20 made in advance by coupling by fastening means It is very easy to synthesize the beam 10 and the precast concrete panel 20. In addition, as described above, in the present invention, since the beam connection assembly 30 is coupled to the precast concrete panel 20 by a very rigid assembly structure, the precast concrete panel 20 is passed through the beam connection assembly 30. ) And the beam 10 are combined, the structural synthesis degree is very excellent.

1 is a schematic perspective view of a composite beam in which a honeycomb girder type beam is combined with a precast concrete panel as an embodiment of the present invention.

2 is a schematic lateral cross-sectional view taken along line A-A of FIG.

3A is a schematic perspective view of one embodiment of a beam connection assembly according to the invention.

3B is a cross-sectional view taken along line B-B of FIG. 1 showing an assembly structure using the beam connecting assembly shown in FIG. 3A.

Figure 3c is a view similar to Figure 3b, a cross-sectional view showing another embodiment of the assembly structure using a beam connection assembly.

4 is a schematic perspective view of another embodiment of a beam connection assembly according to the invention.

 Figures 5a and 5b is a cross-sectional view showing an assembly structure according to the present invention as shown in Figures 3b and 3c, a schematic cross-sectional view showing a structure for securing the coating thickness of the roof reinforcement.

6A to 6C are cross-sectional views showing the assembling structure of the steel beam and the precast concrete panel in the conventional precast concrete panel composite beam, respectively.

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

10: Type I steel beam 20: Precast concrete panel

30: beam connection assembly 31: connection bottom plate

32: fastening plate 33: loop reinforcement

Claims (6)

A beam connecting assembly for integrally assembling and combining the honeycomb girder-type steel beam 10 and the precast concrete panel 20 formed in the abdomen 12 with a cutout portion 14 at a predetermined interval, A plurality of studs 35 are provided on the lower surface thereof, and a connecting bottom plate 31 integrally provided with a fastening plate 32 formed of a pair of vertical steel plates on the upper surface thereof, and an upper portion thereof coupled to the connecting bottom plate 31. The lower part is made up of a loop reinforcement 33 embedded in the precast concrete panel 20 and functioning as transverse reinforcement in the concrete panel 20; The lower end of the abdomen 12 of the steel beam 10 in a state in which the roof reinforcement 33 and the connection bottom plate 31 are embedded in the precast concrete panel 20 and integrally coupled with the precast concrete panel 20. Is inserted into the fastening plate 32 and is fastened integrally with the connection bottom plate 31 by the fastening means, so that the steel beam 10 is integrally assembled with the precast concrete panel 20 and synthesized. Beam connection assembly. A honeycomb girder-type steel beam 10 and a precast concrete panel 20 are integrally assembled by combining the cutout portions 14 at predetermined intervals in the abdomen 12, and are synthesized as a composite beam. The precast concrete panel 20 is provided with a plurality of studs 35 on the lower surface and a connecting bottom plate 31 integrally provided with a fastening plate 32 composed of a pair of vertical steel plates on the upper surface. The upper part is coupled to the connecting bottom plate 31 and the lower part is embedded in the precast concrete panel 20, the beam connection assembly 30 composed of a loop reinforcement 33 which functions as a transverse reinforcement in the concrete panel 20 Are integrally combined, The lower part of the abdomen 12 of the steel beam 10 is inserted into the fastening plate 32 and fastened integrally with the connecting bottom plate 31 by a fastening means, such that the steel beam 10 is connected to the precast concrete panel 20. Precast concrete panel composite beam, characterized in that the unit is assembled and synthesized. delete delete The method of claim 2, Between the connecting bottom plate 31 and the upper surface of the roof reinforcement 33 is installed a plate thickness securing plate 38 having a predetermined thickness to have a structure to ensure the cover thickness of the roof reinforcement 33 Precast concrete panel composite beam. The method of claim 2, The concrete is placed in a state where the upper surface of the connection bottom plate 31 is positioned below the upper surface of the precast concrete panel 20 to couple the precast concrete panel 20 and the connection bottom plate 31, and the connection bottom plate ( 31) Precast concrete panel composite beam, characterized in that the upper surface of the mortar is filled with a structure to secure the coating thickness of the roof reinforcement (33).