KR100634344B1 - Composite slab and the joint structure - Google Patents

Abstract

The present invention relates to a connection structure of a composite bottom plate, the composite bottom plate in the composite bottom plate synthesized by forming a bottom plate comprising concrete on the lower plate, fixed to the lower plate to function as a shear connector and tensile stress reinforcement Perforated vertical stiffeners; And a compressive stiffener installed on the perforated vertical stiffener; and can further reduce the weight of the bottom plate by up to 40%. Can be designed and the weight of the bottom plate is reduced, so that the upper and lower sections of the bottom plate can be reduced economically, so that the composite floor plate can be manufactured economically, and the service life is increased due to the high quality of the composite floor plate. The cost can be reduced.

Composite bottom plate, reinforcement

Description

Composite slab and the joint structure

1A, 1B, 1C and 1D illustrate conventional composite floor plates.

2a, 2b, 2c and 2d is a separate view showing the composite bottom plate of the present invention, its installation configuration, A-A cross-sectional view and perforated vertical reinforcement.

2E and 2F are other examples of the perforated vertical stiffener and its installation diagram.

3A and 3B show an installation example of the composite bottom plate of the present invention.

Figure 4 shows an example of the longitudinal connection of the composite bottom plate of the present invention.

Figures 5a, 5b and 5c shows an example of the transverse connection of the steel box of the mold and the composite bottom plate for the bridge of the present invention.

5D, 5E and 5F show another example of the lateral connection of the PSC girder and the composite composite floor plate for bridges of the present invention.

<Description of Major Reference Signs>

100: synthetic bottom plate 110: bottom plate

120: bottom plate 130: perforated vertical reinforcement

140: compression reinforcement 150: steel box

160: PSC girder 170: vertical perforated end

200: longitudinal connection 300: transverse connection

The present invention relates to a composite bottom plate and its connection structure. More specifically, it relates to a composite bottom plate for civil engineering composites of the lower plate and concrete.

Conventional bridge decks are typically constructed with RC slabs (Reinforced Concrete Slab). It is common that such a RC floor plate is constructed with a thickness of about 20CM, and its own weight is large, and its rigidity is low, so that cracks and sags are generated as the common load (live load) acts, resulting in a decrease in the load capacity and durability of the floor plate. Plate repair and reinforcement work required a lot of manpower and cost. In addition, since construction works are installed by using temporary materials such as copper bars at the site, and construction is done by placing concrete, safety accidents and workability have not been reduced due to height work, and much labor and construction costs in the formwork and reinforcement work have to be increased. The problem was pointed out.

It is a synthetic slab or composite slab developed to replace the RC slab.

The composite bottom plate is usually manufactured in a state in which the lower plate and the concrete are synthesized by placing concrete to have a predetermined thickness on an upper portion of the lower plate made of steel plate, and the tensile stress generated by the common load and the self-weight is the lower plate. This burden, and the compressive stress is produced using a mechanical mechanism that causes the concrete to bear.

Examples of such a composite bottom plate are shown in FIGS. 1A, 1B, 1C, and 1D.

In the composite bottom plate 10a shown in FIG. 1A, an I-shaped steel 13a having a hole formed on an upper portion of the lower plate 12a supported by the mold 11a is installed to have a predetermined interval in the lateral direction. After installing the lower power reinforcing bars 14a to penetrate and installing the upper power reinforcing bars 15a on the bottom plate, the concrete 16a is placed and cured.

However, the composite bottom plate 10a is complicated in structure, requires a large number of I-beams, and is economically low, and is constructed in a manner in which a shear connector is not separately installed on the bottom plate, so that the composite action of the bottom plate and concrete is not established, which is inefficient. There was a problem.

In the composite bottom plate 10b shown in FIG. 1B, the shear connector 13b and the reinforcing bars 14b are installed on the bottom plate in a lattice shape on the bottom plate 12b supported by the mold 11b, and then concrete It is constructed by pouring and curing (15b).

However, the composite bottom plate 10b also has a problem in that the thickness of the lower plate must be increased in order to support the temporary load during construction, and a large number of shear connection materials are required to be installed, resulting in poor workability.

The composite bottom plate 10c shown in FIG. 1C is supported by the mold 11c and has a shear connector 13c and a reinforcing bar 14c on top of the lower plate 12c having an uneven portion A having a concave portion and a convex portion. After installing in a lattice form, it is constructed by pouring and curing concrete.

However, the synthetic bottom plate 10c also has a problem in that the construction is inferior since a large number of shear connection materials need to be installed.

The composite bottom plate 10d of FIG. 1d is Korean Patent Application No. 41239, which is also supported by the mold 11d and has a concave-convex portion A having a concave portion and a convex portion, and a lower plate 12d provided with a shear connecting material 13d. ), I-shaped steel (14d) provided with a shear connector 13d in the concave portion is installed by pouring and curing concrete.

In the case of the composite bottom plate (10d) there is an advantage that the workability is improved by not installing a separate reinforcing bar, but as shown in the case of Figure 1a requires a large number of I-shaped steel is low economical, installation of a large number of shear connector There was also a problem that the workability is poor.

The present invention is to solve the problems of the conventional synthetic bottom plate,

The object of the present invention is to be a major member of civil engineering structures, especially bridges, the material is high strength and structurally rigid to exert its function, excellent in durability and can minimize the maintenance in the state of the common load, construction excellent construction It is possible to shorten the period and to reduce the cross-section of the mold by reducing the weight of the bottom plate, while providing an economical bottom plate.

Another object of the present invention is to provide a connection structure of a composite bottom plate and a mold suitable for a steel box or PSC girder that is a mold.

The present invention to achieve the above technical problem

First, the lower plate constituting the composite bottom plate using a lower plate formed with a plurality of concave-convex portions of the concave portion provided with the bent portion, but instead of using a conventional I-shaped steel as a tensile stress reinforcement in the concave portion of the plate-shaped reinforcement vertically It was installed to have a predetermined height.

Second, the vertical stiffeners were formed by vertical hole stiffeners with a large number of holes, so that the pour concrete was formed in communication with both sides of the vertical stiffeners, so that the vertical stiffeners had the function of shear connector for synthesizing the lower steels and concrete. .

Third, since the porous vertical reinforcing material may have a shape that can be formed by bending the bottom plate of the composite bottom plate in the connection portion where the composite bottom plate is segmented and connected to each other, the additional connection part installation work for the separate composite bottom plate connection To be omitted.

Fourth, in the connection portion between the composite bottom plate and the mold, the mold and the composite bottom plate were connected more effectively by using the vertical perforated stiffener or a combination of the lower steel and / or the upper bent steel.

Fifth, in order to improve the workability of the composite bottom plate to form a groove on the upper surface of the perforated vertical stiffener and to be installed by inserting the compressive stiffener in the groove to improve the workability of the reinforcement work of the compressed stiffener.

BRIEF DESCRIPTION OF DRAWINGS To describe the present invention more clearly and easily, the following describes the best embodiments of the present invention in detail with reference to the accompanying drawings, and the embodiments according to the present invention can be modified in many different forms. The range is not limited to the embodiments described below.

2A and 2B illustrate a composite bottom plate 100 and an assembled state diagram of the present invention, FIG. 2C is a cross-sectional view of the composite bottom plate 100, and FIG. 2D shows a porous composite reinforcement material 130. 2E and 2F are other examples of the porous composite reinforcement and its installation diagram.

The composite bottom plate 100 is formed in the composite bottom plate 100 synthesized by forming a bottom plate 120 including concrete on the bottom plate 110, is fixed to the bottom plate 110, shear connection material and tensile stress reinforcement Perforated vertical stiffener 130, which functions as; And a compressive stiffener 140 installed on the perforated vertical stiffener.

The lower plate 110 may be processed to process a steel plate having a predetermined thickness to form a concave-convex portion (A) and may be similarly referred to as a deck plate, but is not limited to the material and name. The bottom plate material 120 generally refers to concrete, but also includes a material that works by combining with the bottom plate as a material other than concrete. Hereinafter, the lower plate will be described on the basis of the case of using a steel plate, the bottom plate concrete.

The lower plate 110 not only functions as a formwork in which concrete is cast a predetermined height, but also functions as a structural member that resists the lower tensile stress generated when a common load is applied to the composite floor plate, compared with a conventional RC floor plate. Therefore, it is possible to install the lower tensile reinforcing bar of the RC floor plate and to reduce the concrete cross section of the bottom plate tension part.

Thereby, there is an advantage that can significantly reduce the weight of the bottom plate, and the concave-convex portion (A) is continuously formed also has the advantage that can be improved flexural rigidity and torsional rigidity.

The shape of the concave-convex portion A will be said to belong to the technical scope of the present invention as long as the concave portion and the convex portion are formed irrespective of their shape, such as a trapezoidal shape, a circle, and a triangle.

Such a lower plate may be installed in such a way as to be mounted on a mold which is a rigid box 150 or a PSC girder 160 which is installed at regular intervals on a pier, for example, in a bridge construction as shown in FIGS. 3A and 3B. It is installed continuously connected by the connecting portion in the longitudinal direction, that is, the transverse direction, the longitudinal direction and the perpendicular direction.

Since the lower plate 110 installed as described above is exposed to the outside, corrosion of the lower plate may occur. Since the corrosion lowers the durability of the lower plate, it is preferable to prevent corrosion by applying a corrosion inhibitor to the surface, such as hot dip galvanizing.

The perforated vertical reinforcement 130 is responsible for two functions in the present invention.

First, it acts as a tensile stress stiffener to resist common loads. Tensile stress is generated at the bottom of the bottom plate by the common load, and compressive stress is generated at the top. At this time, the tensile stress is mostly the lower plate 110 as described above, if this burden is increased, a problem that should increase the thickness of the lower plate. Since the bottom plate is economical and easy to manufacture depending on its thickness, it is necessary to configure an optimal thickness, but an alternative configuration, that is, tensile stress reinforcing material, can be shared. I-shaped steel may be used as the tensile stress reinforcing material as shown in FIG. 1A, but in the present invention, a vertical reinforcing material 130 having a rectangular plate shape is used in consideration of workability and economic efficiency.

The vertical reinforcing material 130 is produced by processing the steel sheet in consideration of the size of the tensile stress to be shared, but produced in a predetermined length in consideration of the bottom plate width or the size of the modular bottom plate, the height is considered the height of the bottom plate The thickness can be in the form of a rectangular plate in consideration of the installation interval, the size of the uneven portion.

As a result, it is economical, easy to process, and does not consider much of its own weight, thereby making it possible to function as a highly efficient tensile stress stiffener.

The vertical reinforcement 130 is installed vertically fixed to the concave portion 110a of the lower plate 110, which is not only a factor in unnecessarily increasing the thickness of the bottom plate when installed in the convex portion (110b), tension This is because it is structurally efficient to locate the lower steel sheet as a stress reinforcing material. However, it may be installed in the concave portion, but in addition to the convex portion may include adding to match the final height of the bottom plate.

The fixed installation of the vertical reinforcement may be by welding. This is because the steel plate is used as a vertical reinforcing material, so the weight is not large, and it can be sufficiently fixed to the lower plate only by welding.

Since the upper flange of the vertical stiffener 130 is not formed, such as I-shaped steel, it may not be able to sufficiently resist the compressive stress generated in the upper portion of the bottom plate in the present invention can be installed in the upper portion of the compressive stiffener 140 Make sure

Spacer (SPACER) should be used to position the compressive stiffener 140 on the bottom plate, in the present invention to form a groove 132 in the upper portion of the vertical stiffener to serve as a spacer of the compressive stiffener.

The reinforcement of the lattice-shaped reinforcement can be reinforced as the compressive reinforcement 140, since the reinforcement work may be reduced, the reinforcement assembly of the compressive reinforcement to a predetermined size in a lattice shape in advance and the reinforcement assembly in the groove of the vertical reinforcement It is preferable to insert a phosphorus compressive stiffener.

Second, it serves as a shear connector to enable the synthesis of the bottom plate 120 and the bottom plate 110 including concrete.

Conventionally, a plurality of studs or shear connectors are installed in the lower plate by welding as shown in FIGS. 1B and 1C, but this welding method has a problem in that construction is very poor due to a large number of welding operations. Accordingly, in the present invention, the holes are formed in the vertical reinforcement 130, and the concrete is poured so that the vertical reinforcement is buried so that the concrete communicates with each other through the holes 131. To be synthesized. The vertical reinforcement extends in the longitudinal direction and is continuously formed, thereby sufficiently securing the function of the transfer connecting material such as a plurality of studs.

In order to reinforce the function as the shear connector in the present invention by cutting a part of the upper portion of the vertical reinforcement in the vertical direction as shown in Figure 2e by forming a bent state smaller than the right angle to both sides, strengthening the shear connection function and the bottom It is desirable to allow the plates and concrete to effectively resist the forces that are going to open in the vertical direction.

Figure 2f shows a perspective view of the shear connector installed on the bottom plate of the open shape. In addition, when the vertical reinforcement alone may lack the shear connection function, a number of studs may be applied to the bottom plate convex portion only at the bottom plate end to suppress the state slip of the bottom plate and concrete generated at the bottom plate end.

4 shows the longitudinal connection 200 of the composite bottom plate 100.

The composite bottom plate 100 may be made of one member, but may be made of a plurality of segmented composite bottom plates by the necessity of manufacture and transportation thereof. There may be a variety of methods for connecting the segmented composite floor plate to each other in the axial direction, that is, the longitudinal direction, but in the present invention, the vertical vertical portion formed by bending the extended lower plate of the recess formed in the lower plate upward. In the state in which 170 is in contact with each other, it is formed by connecting to each other with fasteners.

That is, when the segmented lower plate 110 is connected to each other, the shape of the connecting portion is formed in the shape of the perforated vertical stiffener, and thus the shape of the lower plate can be prevented from being changed, which is advantageous in terms of structural rigidity.

The hole vertical end portion 170 is bent upward in a state in which the steel plate, which is the lower plate 110 of the recess portion, is extended by a predetermined length.

The bent vertical end forms a hole like a perforated vertical reinforcement provided in the recess. The concave extending portion of the other lower plate to be connected is also fastened to each other by using a fastener including a bolt and a nut in a state in which the vertical vertical end portion 170, which is formed by bending together.

As a result, the lower plates are mechanically connected to each other, and the shape of the connection part is also formed in the same shape as the hole reinforcing means reinforcing part, and thus there is an advantage in that the phenomenon in which the connection part rigidity is reduced due to the change in the rigidity can be prevented.

Synthetic floor plate configured as described above can be installed in a way that is directly installed in the field or modularized in the factory as a precast member in a simple mounting on the site.

Referring to Figures 3a and 3b when first installed directly in the field, if the mold 150, 160 installed on the pier 200, and then the vertical vertical stiffener 130 of the present invention in the axial direction, that is, longitudinal direction, compression The lower plate 110 provided with the reinforcing material 140 is installed on the mold in the longitudinal direction.

After the bottom plate 110 is installed between the molds, the concrete, which is the bottom plate 120, is poured on the molds and the bottom plate. The height of the pour is matched to the design height of the composite deck. This completes the installation of the composite bottom plate.

Next, it can be installed by connecting the modular composite floor plate on the mold in the state in which the composite floor plate is manufactured in a factory in advance and mounted.

Since the lower plate is usually provided with vertical perforated reinforcement, compressed reinforcing bars, backing reinforcing bars, etc., the modularization of the present invention is made by casting and curing the bottom plate in advance at the factory to produce a composite floor plate in a segmented state, and then synthesizing between the mold and the mold. It is installed by mounting the bottom plate. This makes it possible to omit the work process for pouring and curing concrete in the field.

As a result, the composite bottom plate 100 is installed in the transverse direction on the mold. The synthetic bottom plate 100 needs to be connected in the transverse direction on the mold.

This requires a transverse connection of the composite base plate installed in the mold in the longitudinal direction.

Since the configuration of the lateral connection 300 of the present invention may vary somewhat depending on the type of the mold, the present invention will be divided into a case of a steel box and a case of a PSC girder.

First, in the case where the mold is a steel box, the lateral connection between the composite bottom plate and the mold is shown in Figs. 5a, 5b and 5c.

The first embodiment of the transverse connecting portion 300 shown in FIG. 5A is provided from the lower plate 110 to the upper side of the mold side in a state where the connecting end of the lower plate 110 is mounted on the upper side of the mold 150. Perforated vertical stiffener 310 extending in the transverse direction by the length of; And a bottom plate 320 which is poured over the mold 150 so that the extended vertical hole reinforcement 310 is included therein.

The final lateral connection between the mold and the composite bottom plate, which is a steel box, is placed so as to cover the mold and the composite bottom plate with the bottom plate positioned so that the connecting end of the bottom plate 110 of the synthetic bottom plate is placed on the side end of the mold. The bottom plate member 320, which is made of concrete, is connected to each other, and the vertical vertical reinforcement installed in the lower plate is connected to the upper side of the mold side for more effective connection between the composite bottom plate including the lower plate and the mold. When pouring in a state extending in the length (L) of, the vertical hole reinforcement can be functioned as a kind of lateral connection material, the bottom plate and the bottom plate placed on the mold can be combined with each other can be expressed.

The concrete, which is the bottom plate which is poured on the connection part, may be poured together with the concrete which is the bottom plate 320 which is poured on the upper part of the bottom plate installed on both sides of the mold. You may pour concrete that is a floor board by varying the time. Preferably, it is preferable to pour simultaneously.

It is preferable to form a plurality of shear connectors (studs, 330) on the top of the mold to reinforce the synthesis.

In the embodiment 2 of the transverse connecting portion 300 shown in Figure 5b is a vertical perforated reinforcement extending only to the connecting end of the lower plate 110 in a state in which the connecting end of the lower plate 110 is mounted on the side end of the mold ( 160); And a bottom plate 320 disposed on the mold such that the lower steel 340 extending toward the synthetic bottom plate by a predetermined length through the connection end of the upper end of the mold and the lower plate 110 is included therein. .

Unlike the first embodiment, in the second embodiment, as a connecting material, the lower steel material 340 is installed to extend by a predetermined length through the upper connection portion of the mold and the lower connection end of the lower plate, without using a vertical hole reinforcement as a transverse connecting material. It is a method to use. Therefore, the perforated vertical stiffener is formed to extend only to the connecting end of the composite bottom plate without extending over the mold.

Reinforcing steel can be used as the lower steel 340, the end of the reinforcing bar extending on the lower plate can be bent to prevent the possibility of position movement, drawing. Similarly, a plurality of shear connection materials (studs) are disposed on the upper end of the mold, and the synthetic bottom plate and the mold installed by pouring concrete on the upper end of the lower plate and the mold 150 are connected to each other.

Embodiment 3 of the lateral connecting portion 300 shown in Figure 5c, in the second embodiment, is installed on the upper portion of the mold 400 is bent downward at the connecting end of the lower plate extended to the synthetic bottom plate by a predetermined length The steel 350 is configured to further include.

Reinforcing steel can also be used as the upper bending steel 350, by bending downward at the connecting end of the composite bottom plate in a state where the upper bending steel is horizontally installed at a predetermined height by using a spacer or the like on the upper part of the mold. Like the lower steel, it extends inwardly through the lower part of the lower plate.

The upper bent steel 350 also serves to resist the sinusoidal stress generated in the connection portion of the mold installed on the bottom and the composite bottom plate.

Second, when the mold is a PSC girder 160, the connection portion between the composite bottom plate and the mold is shown in Figs. 5D, 5E and 5F.

In the fourth embodiment of the transverse connecting portion 300 shown in FIG. 5D, the connecting end of the lower plate 110 is placed on the upper side of the mold 160, and is disposed over the upper portion of the mold side from the lower plate 110. Perforated vertical stiffener (310) extending laterally by the length of the; A bottom plate 320 disposed on the mold such that the extended vertical hole reinforcement 210 is included therein; And a girder inner steel 360 extending vertically from the PSC girder and bent by a predetermined length toward the composite bottom plate.

The final connection between the PSC girder mold and the composite bottom plate is placed so as to cover the mold and the composite bottom plate with the lower plate positioned so that the connecting end of the lower plate of the synthetic bottom plate is placed on the side end of the mold as in Example 1. The bottom plate is connected to each other by the concrete, and the composite bottom plate including the bottom plate and the vertical perforated vertical reinforcement 310 installed in the bottom plate for connection by concrete more effectively through the mold side end predetermined In the state of extending the length of the, the bottom plate material to form the perforated vertical reinforcement can function as a kind of connecting material, so that the effect that can be combined with the concrete and composite floor plate and the bottom plate material that is cast on the mold to form a mutual connection It is.

The difference from the first embodiment is that the shear connector is shown in the drawing, but a plurality of shear connectors (studs) may not be installed on the top of the mold. The function of such a shear connector is by extending the horizontal girder inner steel material 360, which is a reinforced steel reinforcement embedded in the PSC girder to vertically protrude to the upper end of the mold to be horizontally bent, and to be installed toward the synthetic bottom plate. In other words, the girder inner steel is responsible for the function of the shear connector.

Furthermore, these girder inner steels bear some of the function of the elongated vertical reinforcement. This is because the inner girder steel may also play the role of the above-mentioned vertical perforated stiffener, which increases the function of the connecting material capable of synthesizing the bottom plate with the mold. These girder inner steels are installed when manufacturing PSC girders.

In the fifth embodiment of the connecting portion 300 shown in FIG. 5E, the vertical vertical reinforcement 160 extending only to the connecting end of the lower plate 110 in a state in which the connecting end of the lower plate 110 is mounted on the upper side of the mold. ; A bottom plate 320 disposed on the mold such that the lower steel 340 extending toward the synthetic bottom plate by a predetermined length through the connection end of the upper and lower plates 110 of the mold is included therein; And a girder inner steel 360 extending vertically from the PSC girder and bent by a predetermined length toward the composite bottom plate.

Unlike Example 4, in Example 5, the lower steel 340 is extended by a predetermined length through the upper end of the mold and the lower connection end of the lower plate, as shown in Example 2, without using a perforated vertical reinforcement as a transverse connecting member. ) As a connecting material.

Therefore, the porous vertical reinforcement is formed to extend only to the connecting end of the composite bottom plate without extending over the mold.

Reinforcement can also be used as the lower steel 340, the end of the reinforcing bar extending to the lower plate can be bent to prevent the possibility of position movement, drawing. The inner girder steel embedded in the PSC girder is extended so as to vertically protrude to the top of the mold so as to be horizontally bent and installed toward the composite bottom plate, as in Example 4 above.

Embodiment 6 of the connection part 300 shown in FIG. 5F is installed on the upper part of the mold 400 as in Embodiment 3 while maintaining the configuration of Embodiment 5 as it is, and is bent downward at the connection end of the lower plate to have a predetermined length. As much as the upper bending steel material 350 extending toward the synthetic bottom plate is configured to be included.

Reinforcing steel can also be used as the upper bending steel, and the upper bending steel is horizontally installed at a predetermined height by using a spacer on the upper part of the mold to bend downward from the connecting end portion of the composite bottom plate, as in the lower steel. It is installed by extending inward through the lower plate. The upper bent steel 350 also serves to resist the sinusoidal stress that occurs in the connection portion of the mold installed on the bottom and the composite bottom plate.

According to the synthetic bottom plate of the present invention, specifically, the lower plate can be used to reduce the weight of the bottom plate by up to 40% by using a high strength steel sheet. It is possible to design longer-sized composite floor plates due to its increased rigidity.In case of manufacturing composite floor plates as precast members, it is not only excellent in workability, but also easy to quality control, and installs floor board formwork and temporary construction materials on site. As the rebar assembly process can be omitted, the workability can be reduced and the risk of safety accidents in air-saving and high-altitude operation can be reduced. Not only can we manufacture floorboards, but also improves service life due to the high quality of composite floorboards. The cost can be reduced.

Claims (13)

In the composite bottom plate 100 synthesized by forming a bottom plate 120 containing concrete on the lower plate 110, Perforated vertical stiffener 130 is fixed to the lower plate 110 and functions as a shear connector and tensile stress stiffener; And a compressive stiffener 140 installed on the perforated vertical stiffener. The composite bottom plate is a composite bottom plate in which a plurality of segmented composite bottom plates are connected to each other in the longitudinal direction in the axial direction, and a vertical connection portion of the composite bottom plate is formed by bending the extended lower plate of the concave portion upward. Composite bottom plate, characterized in that the end 170 is in contact with each other, it is connected to each other by a fastener. According to claim 1, wherein the lower plate 110 is further processed by a steel plate is formed with a concave-convex portion (A) provided with a concave portion (110a) and the convex portion (110b), the hole vertical reinforcement material 130 is a steel sheet material The composite bottom plate is characterized in that the vertically fixed to the recess (110a) of the uneven portion (A). The composite bottom plate according to claim 1, wherein a compression reinforcement groove (132) is further installed on the upper surface of the vertical hole reinforcement (130). The composite bottom plate according to claim 3, wherein the compressive reinforcing material (140) is installed by installing a reinforcing bar assembly previously formed in a lattice shape on the groove (132) of the perforated vertical reinforcing material (130). The composite bottom plate according to claim 1 or 2, wherein the lower plate (110) is manufactured by applying a corrosion preventing material. The method of claim 1, wherein the composite bottom plate is manufactured on-site by placing concrete in a state where at least a bottom floor plate, a vertical vertical reinforcement material and a compressive reinforcement material are first installed in the field, or a state in which the composite floor plate is manufactured in a factory in advance. In the field is a composite floor plate, characterized in that the connection is installed while mounting the composite floor plate over the mold. delete delete delete delete In the composite bottom plate 100 synthesized by forming a bottom plate 110 including concrete in the lower plate 110, the vertical vertical reinforcement is fixed to the lower plate 110 and functions as a shear connector and tensile stress reinforcement; And a compressive stiffener 140 installed on the perforated vertical stiffener; the composite bottom plate 100 further comprising a PSC girder, and in the lateral connecting portion of the mold, wherein the lateral connecting portion is a connecting end of the lower plate 110. A vertical hole reinforcement 310 extending from the lower plate 110 to the upper side of the mold side by a predetermined length in a state where it is mounted on the upper side end of the mold; A bottom plate 320 disposed on a mold such that the extended vertical hole reinforcement material 310 is included therein; And a girder inner steel (360) extending vertically from the PSC girder and bent by a predetermined length toward the composite bottom plate. In the composite bottom plate 100 synthesized by forming a bottom plate 110 including concrete in the lower plate 110, the vertical vertical reinforcement is fixed to the lower plate 110 and functions as a shear connector and tensile stress reinforcement; And a compressive stiffener 140 installed on the perforated vertical stiffener; the composite bottom plate 100 further comprising a PSC girder, and in the lateral connecting portion of the mold, wherein the lateral connecting portion is a connecting end of the lower plate 110. Perforated vertical stiffener 310 which extends only to the connecting end of the lower plate 110 in a state mounted on the side end of the mold; A bottom plate 320 disposed on the mold such that the lower steel 340 extending toward the synthetic bottom plate by a predetermined length through the connection end of the upper and lower plates 110 of the mold is included therein; And a girder inner steel (360) extending vertically from the PSC girder and bent by a predetermined length toward the composite bottom plate. The method of claim 12, wherein the transverse connection portion, the upper bending steel 350 is installed on the upper portion of the mold and bent downward at the connecting end of the lower plate extending toward the synthetic bottom plate by a predetermined length, characterized in that it further comprises Composite bottom plate connection structure.

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