KR100543969B1 - Composite rigid-frame bridge installing prestressed compound beam to the contral point of the slab of rigid-frame bridge and connecting the beam to the steel member installed in the upper of pole, and construction method thereof - Google Patents

Abstract

According to the present invention, according to the load stress acting on the ramen bridge, a certain portion of the parent section of the upper end of the column and the parent section of both ends of the slab is composed of steel and concrete, and a portion of the constant moment section of the slab is prestressed composite beam. After installing the connection with the steel installed in the parent section, the reinforced concrete is poured, and a certain portion of the parent section section of the upper column of the column is made of steel and concrete, the rest of the column by installing a column of reinforced concrete The present invention relates to a method for installing a composite ramen bridge that can resist external forces such as transverse pressure.

The fixed section of the composite ramen bridge and slab installed by the above method is installed by the combination of steel and concrete to reduce the dead weight by minimizing the cross section compared to the existing reinforced concrete section and the constant section of the static moment section of the slab By installing the rest composite beam, it becomes thinner than the existing reinforced concrete cross section, so there is an advantage that the geometry of the bridge can be secured more.

Description

Composite rigid-frame bridge installing prestressed compound beam to the contral point of the slab of rigid installed by installing prestressed composite beam in the center of slab of ramen bridge and connecting with steel installed on top of column -frame bridge and connecting the beam to the steel member installed in the upper of pole, and construction method approximately}             

1 is a view showing a conventional reinforced concrete ramen bridge.

Figure 2 shows the outer point connecting steel for the installation of the composite ramen bridge of the present invention.

Figure 3 shows a central point connecting steel for the installation of the composite ramen bridge of the present invention.

4 is a view showing a prestressed composite beam installed in the center of the slab of the composite ramen bridge of the present invention.

5 is a view showing a prestressed composite beam for installation in the shift portion of one side of the composite ramen bridge of the present invention.

Figure 6 is a view showing the installation of the outer point connecting steel of Figure 2 in the column for the installation of the composite ramen bridge of the present invention.

7 is a view showing that the central prestressed composite beam of Figure 4 connected to the outer point connecting steel for the installation of the composite ramen bridge of the present invention.

FIG. 8 is a view showing completion of a composite ramen bridge by reinforcing reinforcing bars and slaying concrete to a column and a slab to which a central prestressed composite beam is connected to install the composite ramen bridge of FIG. 7. FIG.

9 is a view showing the installation of the outer point connecting steel and the center point connecting steel in the column for the installation of the multi-span composite ramen bridge which is another embodiment of the composite ramen bridge of the present invention of FIG.

FIG. 10 is a view illustrating a state in which a central prestressed composite beam is connected between an outer point connecting steel and a center point connecting steel of FIG. 9; FIG.

11 is a view showing the installation of a multi-span composite ramen bridge by laying reinforcing steel in the state of Figure 10 and pouring concrete.

FIG. 12 is a view illustrating a method of determining the vertical length and the horizontal length of FIG. 7 using a stress diagram of a short span composite ramen bridge.

FIG. 13 is a view showing a method of determining vertical and horizontal lengths of a multi-span composite ramen bridge of FIG. 9 and a horizontal length of a center point connecting steel using a stress diagram of a multi-span composite ramen bridge. FIG.

14 is a view showing the installation of alternating multi-span synthetic ramen bridges having alternates installed on the left and right sides of another embodiment of the composite ramen bridge of the present invention.

FIG. 15 is a view showing that the central prestressed composite beam and the point prestressed composite beam of FIGS. 4 and 5 are respectively installed between the alternation and the pillar of FIG. 14; FIG.

FIG. 16 is a view showing the installation of a composite ramen bridge by reinforcing reinforcing bars and pouring concrete for installation of an alternating multi-span composite ramen bridge in which a point and a central prestress composite beam of FIG. 15 are installed;

17 is a view showing a method of determining the length of the horizontal portion and the vertical portion of the center point connecting steel of the alternating multi-span composite ramen bridge of FIG.

FIG. 18 is a cross-sectional view of a point part and a center part of the slab parent and positive moment sections of the prestressed composite beams of FIGS. 8, 11, and 16.

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

   A: Stress Diagram of Short Span Composite Ramen Bridge B: Stress Diagram of Multi-Span Composite Ramen Bridge

   C: Alternating Multi-Span Synthetic Ramen Bridge

   H₁: Length of outer point connecting steel vertical part L₁: Length of outer point connecting steel horizontal part

   H₂: Length of center point connecting steel vertical part L₂: Length of center point connecting steel vertical part

   10: reinforced concrete ramen bridge 11: slab

   12: pillar 13: foundation

   14 branch

   20: synthetic ramen bridge 22: column

   23: slab 24: haunting department

   25: foundation 26: ground

   30: short span composite ramen bridge 31: connection portion

   32: outer upper branch portion 33: outer lower branch portion

   34: center upper branch

   40: outer point connecting steel 41: vertical portion

   42: horizontal portion 43: steel connection point

   44: oblique haunt mounting portion

   50: center point connecting steel

   60: prestressed composite beam 61: steel extension portion

   62: lower casing concrete 63: type I steel

   70: center prestressed composite beam

   80: point prestressed composite beam 81: concrete extension

   90: multi-span synthetic ramen bridge

   100: alternating multi-span synthetic ramen bridge

   101: shift 102: installation unit

The present invention is to install a composite type ramen bridge to install concrete after pouring concrete after arranging steel and prestressed composite beams and interconnecting reinforcing bars after arranging the various steel materials and prestressed composite beams efficiently according to the load action on the ramen bridge It is about a method.

 The composite ramen bridge is composed of short span, multi span and alternating composite ramen bridge. The composite ramen bridge is formed by interconnecting the parent section of the upper end of the column installed on the foundation and the column and the pillar. A certain part of the parent moment section of both ends of the slab is made of a composite of steel and concrete, and a certain part of the constant moment section of the slab is installed a prestressed composite beam and connected to the steel installed in the parent section to reinforce the reinforcing bar. And pour concrete, and the remaining sections except for a certain portion of the parent section of the upper part of the column is to install a column of reinforced concrete.

The object of the present invention is to install a certain section of the composite slab and slab of the synthetic ramen bridge installed by the above method, the steel and concrete is installed, the pre-stressed prestressed composite beam is installed in the center of the slab to the existing reinforced concrete cross section Compared with the conventional ramen bridge, the cross section can be reduced to minimize dead weight.The constant section of the slab is thinner than the reinforced concrete section of the slab of the conventional slab by installing prestressed composite beams. It is to provide the method of installing the ramen bridges, which can secure the space of the die, and also the various types of bridges to select and install the type of the ramen bridge according to the situation of the site.

 Conventional reinforced concrete ramen bridge is composed of a slab 11, a column 12 and the base 13, as shown in Figure 1 and the point portion 14 is connected to the slab 11 and the column 12 is a rigid body It is a ramen bridge of reinforced concrete materials connected by steel wires.The column 12 and the slab 11 are made of reinforced concrete, which is a single material connected by steel, so the cross section increases to resist the load acting on the bridge itself. Due to the increase of the dead weight and the reduction of the geometry of the bridge, and the increase of the cross section, the slab type ramen bridge is generally used only for bridges with short spans. General bridges using girders or boxes are used, and many problems have been raised when the conventional ramen bridge is applied to the site. .

The present invention has been proposed to improve the above problems, and according to the load stress acting on the ramen bridge, a certain portion of the parent section of the upper end of the column and the section of the parent of the both ends of the slab is made of steel and concrete, A certain part of the static moment section of the slab is installed prestressed composite beam and connected to the steel installed in the parent section section, reinforce the reinforcement and pouring concrete, and the remaining sections except for a certain portion of the parent section section of the column top Reinforced concrete pillars are installed to resist external forces such as transverse pressure, and the composite ramen bridge columns and slabs are constructed by combining steel and concrete with a certain section of existing reinforced concrete cross sections. To reduce the cross section to minimize dead weight The fixed section of the slab's constant moment section is thinner than the existing reinforced concrete section by installing prestressed composite beams, so that the geometry of the bridge can be largely secured, and various types of synthetic ramen bridges can be applied depending on the site conditions. To provide a construction method for the.

The present invention relates to a composite ramen bridge 20 consisting of a short span 30, a multi span 90 and an alternating synthetic ramen bridge 100, wherein the short span synthetic type of the synthetic ramen bridge 20 is The ramen bridge 30 is a parent section of the upper end of the pillar 22 installed on the foundation 25 installed on the ground 26 and the parents of both ends of the slab 23 formed by connecting the pillar 22 and the pillar to each other. A certain portion of the cement section is made of a composite of steel and concrete, and a predetermined portion of the static moment section of the slab is provided with a prestressed composite beam 60 to connect with the steel installed in the parent section, and then reinforce the reinforcement and concrete. It is pour-in curing, except for a certain portion of the parent section of the upper part of the column 22 is to install a column of reinforced concrete,

The multi-span synthetic ramen bridge 90 is provided with a pillar 22 at the center to form one or more sections between the pillar 22 and the pillar installed for the installation of the short-span synthetic ramen bridge 30. To install a multi-point composite ramen bridge (90) installed by connecting the center point connecting steel (50) thereon and interconnecting them.

Another example is an alternating installation multi-span synthetic ramen bridge 100, in which an alternating 101 is installed in place of a column 22 installed outside to install the multi-span synthetic ramen bridge 90 and installed on the shift. While mounting the prestressed composite beam 60 on the hinge shaft installed on the pedestal device installation unit 102, the center point connecting steel 50 is installed on the pillar 22, which is installed in the middle of the bridge, and the prestressed composite beam 60 ), Which is installed in interconnection.

Hereinafter, the configuration and operation of the present invention by the accompanying drawings in detail as follows.

2 is a view showing the outer point connecting steel material for the installation of the composite ramen bridge of the present invention, for the installation of the short span 30 and the multi-span synthetic ramen bridge 90 which are the composite ramen bridge 20. It is installed on the column 22 to be installed on both sides as a vertical portion 41 having a certain length and a horizontal portion 42 extending in a predetermined length from the steel connection point portion 43 formed by bending at a right angle at the vertical portion As a whole, the outer point connecting steel 40 formed of the "a" shaped steel material, the vertical portion 41 is installed on the column 22 and the horizontal portion 42 is installed inward to form a ramen bridge.

In addition, the inclined haunch installation unit 44 is formed below a predetermined distance of the horizontal part 42, and the installation assembly of the ramen bridge is completed in the future, the rebar is reinforced, and the concrete is poured to form the ramen bridge while the slab 23 is formed. The lower portion of the column 22 is to be installed to form a haunting portion 24 of a constant size.

3 is a view showing a central point connecting steel for the installation of the composite ramen bridge of the present invention, the multi-span 90 and the alternating multi-span synthetic ramen bridge 100, which is a composite ramen bridge 20. It is installed on a plurality of pillars 22 installed in the bridge of the bridge for the installation of the horizontal portion 42 of a certain length and the vertical portion 41 formed by extending a predetermined length downward at a right angle from the central portion of the horizontal portion As the center point connecting steel 50 having a "T" shape as a whole, the vertical portion 41 is installed on the pillar 22 installed in the space, and the outer point connection is installed on the pillar 22 installed outside the ramen bridge. It is for connecting the horizontal portion 42 of the steel 40 and the prestressed composite beam 60 to be described later.

In addition, the inclined haunch mounting portion 44 is formed below a certain distance of the horizontal portion 42, and the assembly of the ramen bridge is completed in the future, the reinforcing bars are installed, and then the concrete is poured to form the ramen bridge while slab ( The lower portion of the 23 and the pillars are installed in order to form a haunting portion 24 of a certain size. 4 is a view showing a prestressed composite beam installed in the center of the slab of the composite ramen bridge of the present invention, the predetermined length of both ends of the lower flange while introducing a preflection load to the I-shaped steel 63 bent upwards The prestressed composite beam 60 for removing the preflection load gradually after removing the lower casing concrete 62 and pouring the lower casing concrete 62 to the remaining portion except to form the steel extension 61 made of the shape steel 63. The center prestressed composite beam 70 of

The center prestressed composite beam 70 is connected to the outer point installed on the pillar 22 installed on both sides of the outside for the installation of the short span, multi span and alternating multi span composite ramen bridges described in FIGS. 2 and 3. Between the horizontal portion 42 of the outer point connecting steel 40 and the center point connecting steel 50 is installed between the horizontal portion 42 of the steel material 40, or installed on the pillars installed in the outer and the interior of the paper, respectively. When installed and connected or when the alternating 101 is installed, a plurality of pillars 22 are installed on the inner side of the bridge and installed and connected between the horizontal portion 42 of the center point connecting steel 50 installed thereon. will be.

Steel extension portions 61 having a predetermined length are formed at both ends of the I-type steel 63 so as to be installed and connected between the horizontal portions 42, and the steel portions and the connecting portions 31 of the horizontal portions 42. ) To form a connection.

FIG. 5 is a view showing a prestressed composite beam for installing at an alternating point of one side of the composite ramen bridge of the present invention. The lower casing concrete is formed to form a steel extension portion 61 made of an I-type steel having a predetermined length, and the other side is formed with a concrete extension 81 having a predetermined length extending outward beyond the length of the I-type steel 63. After pour curing 62, the prestressing composite beam 80 of the prestressed composite beam 60 to gradually remove the preflection load to introduce the prestress.

The point prestressed composite beam 80 has a plurality of the inner side of the interval when the alternating 101 is installed on both sides of the outer side for the installation of the alternating multi-span composite ramen bridge 100 described in Figs. Two pillars 22 and connected to the horizontal portion 42 of the central point connecting steel 50 installed thereon and the steel extension 61 of the branch prestressed composite beam 80 and the point prestressed composite beam 80 Concrete extension portion 81 formed on one side of the) is manufactured to be mounted on the bridge device installation unit 102 installed on the shift 101.

FIG. 6 is a view illustrating the installation of the outer point connecting steel of FIG. 2 in a pillar for installing the composite ramen bridge of the present invention. As shown in FIGS. 2 and 3, the pillar 22 is formed on the ground 26. The horizontal portion 42 is provided with a column on the plurality of foundations 25 for installation, mounted on the vertical portion 41 of the outer point connecting steel 40 thereon, and the inclined haunch installation portion 44 is formed on the lower side inwardly. The above work should be carried out so that a bridge width and length can be formed.

FIG. 7 is a view showing the central prestressed composite beam of FIG. 4 connected to the outer point connecting steel in order to install the composite ramen bridge of the present invention. When the operation of FIG. 7 is completed, the central prestressed composite of FIG. The connecting portion 31 is formed by bolts or welding with the horizontal portion 42 of the steel extension portion 61 formed at both ends of the composite beam 70 and the outer point connecting steel 40 installed on the pillars 22 installed at both sides. The frame for installing the short span synthetic ramen bridge 30 is installed.

In FIG. 12, H 'represents the length of the vertical portion 41 of the outer point connecting steel 40, and L' represents the length of the horizontal portion 42 of the outer point connecting steel 40. FIG. Will be described in detail how to determine the length.

FIG. 8 is a view showing completion of a composite ramen bridge by placing reinforcing bars on a column and a slab connected to a central prestressed composite beam and installing concrete to install the composite ramen bridge of FIG. 7. While placing reinforcing bar in the vertical part 41 and the horizontal part 42 and the central prestressed composite beam 70 of the installed outer point connecting steel 40 and the predetermined portion of the inclined haunch installation part 44 and the column and The short span composite type ramen bridge is performed by arranging the reinforcing bar for installing the haunch unit 24 and placing the reinforcing concrete to form the slab 23 to form the length and width of the bridge. Complete the installation of 30).

The pillar portion extending from the pillar 22 originally installed by the concrete poured on the vertical portion 41 and the horizontal portion 42 is made of reinforced concrete, which is a conventional pillar portion, whereas the pillar portion is made of steel and concrete. The central portion of the prestressed composite beam 60 is installed so that the slab 23 in which the prestress is introduced.

9 is a view showing the installation of the outer point connecting steel and the center point connecting steel to the columns for the installation of the multi-span composite ramen bridge, which is another embodiment of the composite ramen bridge of FIG. 9, as shown in the drawing. A pillar 22 is formed on the foundation 25 installed on both sides, and an outer point connecting steel 40 is installed thereon, and then a plurality of pillars corresponding to the width of the planned bridge is installed inside the pillar 22. After installing the center point connecting steel 50 above the horizontal portion 42 of the outer point connecting steel 40 installed on the column 22 installed on the outside and the horizontal portion 42 of the center point connecting steel 50 And connecting the central prestressed composite beam 70 to each other by forming a connecting portion 31 by bolts or welding to perform the work until the width and length of the planned bridge is formed to establish a multi-span composite ramen bridge 90. Install the backbone for.

H₂ of the center point connecting steel 50 indicates the length of the horizontal portion 42, L₂ means the length of the vertical portion 41, the calculation of the appropriate length will be described in FIG.

FIG. 10 is a view illustrating a state in which a central prestressed composite beam is connected between the outer point connecting steel and the center point connecting steel of FIG. 9, and the horizontal portion 42 of the outer point connecting steel 40 described with reference to FIG. 9. Steel extension portion 61 provided at both ends of the central prestressed composite beam 70 and the connection portion 31 is formed by extending the bolt or welding.

FIG. 11 is a view showing installation of a multi-span composite ramen bridge by reinforcing reinforcing bars and curing concrete in the state of FIG. 10, wherein the vertical portion 41 of the outer point connecting steel 40 installed on the pillar 22 is illustrated. And a haunting unit at an upper predetermined portion of the inclined haunch installation unit 44 and the column 22 disposed below the horizontal unit 42 while arranging reinforcing bars in the horizontal unit 42 and the central prestressed composite beam 70. After reinforcing the reinforcing bars to form (24) and then pouring concrete to install a composite ramen bridge (20), which is a multi-span composite ramen bridge (90).

The pillar portion extending from the initially installed column by the concrete poured on the vertical portion 41 and the horizontal portion 42 is made of steel and concrete, the existing pillar portion is made of reinforced concrete, the center portion of the slab prestress The composite beam 60 is installed so that the slab 23 into which the prestress is introduced is formed.

FIG. 12 is a view illustrating a method of determining the vertical length and the horizontal length of FIG. 7 using a stress diagram of a short span composite ramen bridge, wherein the vertical length H1 of the outer point connecting steel 40 is lower than FIG. The length of the vertical portion is the distance from the point of the upper branch portion bending moment MP4 equal to the absolute value of the point maximum minor bending moment MP1 to the point where the upper branch maximum bending moment MP3 occurs. (H1) is shown, the horizontal length (L1) of the outer point connecting steel 40 is the upper slab at the point where the negative bending moment (MD3) the same absolute value as the absolute maximum bending moment (MD1) of the slab center The distance to the outer upper point portion 32 where the maximum portion bending moment MD2 is generated is the horizontal portion length L1.

 FIG. 13 is a view showing a method of determining the length of the vertical and horizontal portions of the multi-span composite ramen bridge of FIG. 9 and the length of the horizontal portion of the center point connecting steel using the stress diagram of the multi-span composite ramen bridge. Determining the vertical length H₁ and the horizontal length L₁ is already described in detail with reference to FIG. 12, and thus the description thereof is omitted. However, in the multi-span composite ramen bridge stress diagram (B), the center point connection steel material 50 is determined. The method of determining the horizontal portion length L1 of the slab center point generated at the center upper point portion 34 at the point where the secondary bending moment MD4 having the same absolute value as the maximum absolute bending moment MD1 of the slab center is generated. The length obtained by doubling the distance to the maximum maximum minor bending moment (MD2) is referred to as the horizontal portion length (L2).

FIG. 14 is a view showing the installation of alternating multi-span synthetic ramen bridges in which alternate installations are installed on left and right sides of another embodiment of the synthetic ramen bridge according to the present invention. After installing a plurality of pillars 22 so that the length and width of the installation of the center point connecting steel 50 thereon and the concrete extension 81 of the point prestressed composite beam 80 mentioned in FIG. ) Is installed to the hinge device mounting portion 102 of the shift 101 and then the horizontal of the steel extension portion 61 and the central point connecting steel 50 formed on the other side of the point prestressed composite beam 80 4 is formed between the horizontal portions 42 and the horizontal portions of the plurality of central point connecting steels 50 installed on the inner pillars 22 to form and connect the connecting portions 31 to the portions 42 by bolts or welding. Center prestress Synthetic type ramen which is a multi-span composite type ramen bridge (100) installed alternately by working so that the width and length of the designed bridge can be formed by connecting the composite beam 70 to form a connection portion 31 by bolt or welding. Complete the skeleton of the bridge 20.

FIG. 15 is a view showing the central prestressed composite beam and the point prestressed composite beam of FIGS. 4 and 5 respectively installed between the alternation and the pillar of FIG. 14, which will be described in detail in FIG. 14 and will not be described.

FIG. 16 is a view showing that the synthetic type ramen bridge is installed by curing reinforced concrete for installing the alternate multi-span composite ramen bridges in which the points and the central prestressed composite beams in FIG. 15 are installed. The center prestressed composite beam 70 and the point prestressed composite beam 80 installed by connecting and installing the respective reinforcing bars on the composite beams 70, 80 and the central point portion of the center point connecting steel 50 Reinforcing bar for forming the haunch installation portion 44 and the upper portion of the column 22 connected to the lower portion of the horizontal portion 42 is connected to each other and reinforce concrete to pour the shift and the point frist Between the rest of the composite beam (80) is to be mounted by the hinge of the seat device installation unit 102, the one end of the point prestress composite beam (80) and the central point connection The portion connected to the horizontal portion 42 of the ash 50 and the horizontal portion 42 of the central prestressed composite beam 70 and the portion connected to the horizontal portion 42 of the central point connecting steel 50 are haunted portions. (24) is to be installed while being integrated.

17 is a view showing a method of determining the length of the horizontal portion and the vertical portion of the center point connecting steel of the alternating multi-span composite ramen bridge of FIG. 14 by using a stress diagram. The sub-length L2 and the vertical-length H2 are determined in the same manner as described in FIGS. 12 and 13, except that the alternate multi-span synthetic ramen bridge 100 is installed at the alternate 101. Since the prestressed composite beam 80 is mounted by the hinge, no stress is generated in the shifts 101 on both sides, so the horizontal length and the vertical length of the center point connecting steel 50 are located on the upper part of the pillar installed between the two shifts. The vertical length of the installed central point connecting steel has the maximum positive bending moment at the upper point (MP3) at the point where the positive bending moment (MP4) with the same absolute value as the lower maximum point bending moment (MP1) occurs inside. Is the distance to the point where the horizontal section length is the maximum bending moment (MD2) at the center point of the slab at the point where the negative bending moment (MD3) of the same magnitude as the absolute value of the maximum slab center (MD1) is generated. The distance multiplied by the distance to the point where) occurs.

As described above, setting the length of the horizontal portion and the length of the vertical portion is to install the reinforced concrete column up to the height of the column where the maximum bending moment occurring at the point of the ground and the moment of the same absolute value occur, and the steel is installed thereon. In the upper part of the upper part of the upper part, the steel can resist the bending moment to improve the rigidity, and the steel forming the horizontal part installed in the outer point of the slab and the steel of the prestressed composite beam installed in the center of the slab are connected to each other. Allows the entire slab to act as a prestressed slab, making it thinner than the slab of the conventional Ramen bridge of reinforced concrete, securing a wider mold space, reducing dead weight, and bringing the load capacity closer to the original design load for practical durability. Building bridges with both efficiency and efficiency It is intended to.

18A and 18B are cross-sectional views of a point part and a center part of the slab parent and positive moment sections of the prestressed composite beams of FIGS. 8, 11, and 16, and FIG. A is a parent section of the prestressed composite beam 60. It shows a cross-sectional view of the phosphorus point, and the slab 23 is formed by pouring reinforced concrete into the I-type steel 63, and FIG. B is a cross-sectional view showing the central portion, which is a positive moment section of the prestressed composite beam 60, and I In order to introduce the prestress to the shape steel 63, the lower flange casing concrete 62 was cast on the lower flange, and the reinforcement part 24 was disposed while reinforcing the reinforcing bar to the prestressed composite beam 60 for the installation of the ramen bridge. ) And then cast concrete to form a slab (23).

The above-described short span, multi span and alternate installation of the multi span synthetic ramen bridge is as follows. First, the construction method of the short span synthetic ramen bridge 30 is

        a) installing at least a plurality of foundations 25 on the ground and a column 22 thereon according to the width and length of the pre-designed ramen bridge;

        b) installing the outer point connecting steel (40) on the opposite side while installing the vertical portion (41) of the outer point connecting steel (40) on the column (22);

        c) The horizontal portion 42 of the outer point connecting steel 40 and the center prestress while installing a central prestressed composite beam 70 between the horizontal portion 42 of the outer point connecting steel 40 oppositely installed Connecting the steel extension portion 61 provided on both sides of the composite beam 70 to form an extension portion 31 by bolts or welding;

        d) the horizontal portion 42 and the central prestressed composite beam while arranging the rebar for forming the haunch portion 24 at a predetermined position of the inclined haunch installation portion 44 and the column installed under the horizontal portion 42; Placing a reinforcing bar in the 70 and placing concrete in the vertical part 41 while placing concrete to form a haunch part 24 to install a short span synthetic ramen bridge 30;

        e) tiling the formwork and surroundings for installing the ramen bridge, and completing the installation of the bridge.

       In addition, the installation method of the multi-span synthetic ramen bridge 90

        a) installing the column 22 while installing the foundation 25 on the ground 26 according to the width and length of the pre-designed bridge;

        b) Install the outer point connecting steel 40 on the upper side of the pillar 22 installed on the outer side, and install the pillar 22 while installing a plurality of bases 25 between the outer pillars, and the center point connecting steel on it. Installing 50;

        c) mutual bolting or welding between the horizontal portion and the steel extension of the central prestressed composite beam 70 between the outer point connecting steel 40 and the center point connecting steel 50 and between the center point connecting steel 50; Forming and connecting the connection portion 31 to each other;

        d) placing the reinforcing bar in the horizontal portion 42 and the central prestressed composite beam 70 of the outer point connecting steel 40 and the center point connecting steel 50 and pours concrete while the concrete in the vertical portion 41 Installing a multi-span synthetic ramen bridge 90 on which the haunting unit 24 is installed while pour in place;

        e) to remove the formwork installed for the installation of the ramen bridge is installed in the step of arranging the surroundings,

        Yet another embodiment of the installation method of the alternating multi-span synthetic ramen bridge 100 is

        a) installing alternating 101 on both sides according to the width and length of the pre-designed bridge, and installing pillars 22 on the plurality of foundations 25 therebetween;

        b) installing a central point connecting steel (50) on the column;

        c) Concrete extension portion 81 is mounted on the seating device installation portion 102 of the shift 101 while connecting and connecting the point prestressed composite beam 80 between the shift 101 and the center point connecting steel 50 Connecting the horizontal portion 42 of the central point connecting steel 50 and the steel extension 61 of the central prestressed composite beam 70 to each other;

        d) placing the reinforcing bar in the pre-stressed composite beam 80 and the center point connecting steel 50 installed between the alternating 101 and the center point connecting steel 50 and pour concrete and lower the horizontal portion 42 Multi-span composite ramen bridges with alternating installation by placing concrete on the columns while placing reinforcing bars at certain positions of the inclined haunch installation section 44 and the pillars 22 installed in the concrete to form the haunches 24. 100) installing;

        e) Installing through the step of arranging the surroundings while removing the formwork installed for the installation of the ramen bridge.

As described above, in the present invention, a predetermined section of the upper end of the column and a constant section of the slab's parent moment are made of a composite type of steel and concrete, and the remaining sections except the composite section of the upper end of the column are made of reinforced concrete and have a constant section of the positive moment of the slab. By constructing prestressed composite beams, it is possible to obtain a large cross section reduction effect compared to the cross section of existing reinforced concrete ramen bridges, and to increase the space by two to three times compared to the reinforced concrete ramen bridges, and to secure a large space for the geometry Construction method of composite type ramen bridge that can reduce the cost of bridge construction and construct efficient bridges with enhanced load capacity by reducing the number of columns needed compared to the existing reinforced concrete ramen bridges It is

Claims (14)

A column is installed on a plurality of foundations installed on the ground, and a pair of outer point connecting steels are installed thereon, and a connection part in which a central prestress composite beam is installed is formed therebetween to form a slab, and then cast concrete on the column. In the slab, a prestressed composite beam, which is characterized by a short-span composite ramen bridge installed by reinforcing reinforcement and concrete, is installed in the center of the slab of the ramen bridge and connected to the steel installed on the top of the column. .        Install the foundation on the ground and install the pillar, but install the outer point connecting steel on the outer column and install the plurality of foundations between the outer pillars, and install the pillar and install the center point connecting steel on it The central prestressed composite beam is installed between the steel and the central point connecting steel and between the connecting point of the central steel to form a connecting part for connection, and then cast concrete on the column where the outer point connecting steel is installed. The prestressed composite beam, which is a multi-span composite ramen bridge, which is installed by placing reinforcing bars and placing concrete on the slab formed between the central prestressed composite beam installed between the center and the connecting steel and the central point connecting steel, We install in the center of slab of ramen bridge A composite ramen bridge installed in connection with the steel installed on the top of the pillar.         Shifts are installed on both sides, and a plurality of columns are installed between them, and a central point connecting steel is installed thereon, and a branch prestressed composite beam is installed between the shift and the central point connecting steel, and between the center point connecting steels. The prestressed composite beam, which is characterized by the alternating installation multi-span composite ramen bridge, which is installed by placing reinforcing steel in the slab formed by installing and connecting the center prestressed composite beam, is installed in the center of the slab of the ramen bridge, Composite ramen bridges connected to steel in         The method according to claim 1 or 2         The outer point connecting steel is installed on a column as a vertical portion having a predetermined length and the horizontal portion is bent at a right angle in the vertical portion formed in a vertical portion of the steel connection point formed at a lower portion formed in the horizontal portion installed inclined haunch installation in the lower portion as a whole. "Composite type ramen bridge installed by connecting prestressed composite beam, which is characterized by being formed of a shaped steel, in the center of the slab of the ramen bridge and connecting with the steel installed on the top of the column.         The method of claim 2 or 3,         The central point connecting steel is installed on a plurality of pillars installed in the bridge, and the horizontal portion of the predetermined length formed with the inclined haunch installation portion at the bottom and the vertical portion formed by extending the predetermined length downward at a right angle from the center of the horizontal portion. Synthetic type ramen bridge installed by connecting prestressed composite beam, which is characterized by being a steel having an overall "T" shape, in the center of the slab of the ramen bridge and connecting with the steel installed on the upper part of the column.         The method according to any one of claims 1 to 3,         The central prestressed composite beam is pre-loaded into the I-shaped steel bent upward by a certain amount, while a certain length of both ends of the lower flange is formed so as to form a steel extension part of the I-type steel except the lower casing concrete is poured. And a prestressed composite beam which is characterized in that it is a prestressed composite beam which gradually removes the preflection load so that prestress is introduced into the center of the slab of the ramen bridge, and is connected to the steel installed on the top of the column.         The method of claim 3, wherein         The point prestressed composite beam introduces a pre-flection load to the I-shaped steel bent upward by a certain amount, and one end of the lower flange forms a steel extension part of the I-shaped steel having a certain length, and the other side forms the length of the I-shaped steel. The prestressed composite beam is characterized by being a prestressed composite beam in which the pre-stress is gradually removed by pouring the lower casing concrete to form a concrete extension part which is formed to extend to a certain length beyond. Composite ramen bridge installed at the center and connected to the steel installed at the top of the column.         The method of claim 4, wherein         The vertical point length of the outer point connecting steel is the upper point part bending moment MP3 at the point where the upper point part bending moment MP4 has the same absolute value as the size of the lower point part maximum bending moment MP1. A composite ramen bridge installed by connecting a prestressed composite beam to the center of the slab of the ramen bridge, which is characterized by a distance to the point of connection, and connecting it with the steel installed on the upper part of the column.         The method of claim 4, wherein        The length of the horizontal portion of the outer point connecting steel is the outer side where the maximum slab bending moment (MD2) is generated at the upper point of the slab at the point where the second bending moment (MD3) having the same absolute value as the absolute maximum bending moment (MD1) of the slab center portion is generated. A composite ramen bridge installed by connecting a prestressed composite beam to the center of the slab of the ramen bridge, which is characterized by the distance to the upper point, and connecting with the steel installed on the upper part of the column.         The method of claim 5,         The length of the vertical part of the center point connecting steel is installed on the upper part of the pillar between the two side shifts, and the upper part at the point where the positive part bending moment MP4 having the same absolute value as the maximum part bending moment MP1 is generated. Prestressed composite beam, which is characterized by the distance to the point where the maximum positive bending moment (MP3) occurs, is installed at the center of the slab of the ramen bridge and connected to the steel installed on the top of the column.         The method of claim 5,         The length of the horizontal portion of the center point connecting steel is installed on the upper part of the pillar installed between the two sides alternately, the slab at the point where the maximum bending moment (MD1) of the slab center portion and the negative bending moment (MD3) of the same magnitude as the absolute value occurs The prestressed composite beam, which is characterized by multiplying the distance to the point where the maximum secondary bending moment (MD2) occurs at the center point, is installed at the center of the slab of the ramen bridge and connected to the steel installed at the top of the column. Installed composite ramen bridge.         a) installing at least a plurality of foundations on the ground according to the width and length of the pre-designed ramen bridge and installing the columns thereon;         b) installing the outer point connecting steel on the opposite side while installing a vertical portion of the outer point connecting steel on the pillar;         c) forming an extension part by bolting or welding the steel extension part provided on both sides of the horizontal part of the outer point connecting steel and the central prestressed composite beam while installing a central prestressed composite beam between the horizontal parts of the oppositely installed outer point connecting steel; While connecting;         d) placing the reinforcing bar on the horizontal part and the central prestressed composite beam and placing concrete in the vertical part while arranging the reinforcing barn installation part installed at the lower part of the horizontal part and the reinforcing bar to form the haunch part at a predetermined position. Installing a short span synthetic ramen bridge by forming a haunch while pouring concrete;         e) Prestressed composite beam, characterized by consisting of the formwork and the surroundings for installing the ramen bridge to complete the installation of the bridge to the center of the slab of the ramen bridge and the steel and Construction method of the composite ramen bridge installed by connecting.         a) installing the columns along the ground along the width and length of the pre-designed bridge;         b) installing an outer point connecting steel on the column installed on the outer side and installing a plurality of bases between the outer pillars and installing a central point connecting steel on the pillar;         c) installing a central prestressed composite beam between the outer point connecting steel and the center point connecting steel and between the center point connecting steel, the horizontal portion of the outer point connecting steel and the center point connecting steel and the steel of the central prestressed composite beam Interconnecting with the extension to form a connection;        d) Placing concrete on the outer point connecting steel installed on the column, placing reinforcing bar in the slab formed by interconnecting with the horizontal part of the outer point connecting steel and the center point connecting steel and the steel extension of the central prestressed composite beam. Installing a multi-span synthetic ramen bridge in which the cultivation unit is installed while pouring;         e) The prestressed composite beam, which is characterized in that the step of arranging the surroundings while removing the formwork installed for the installation of the ramen bridge, is installed in the center of the slab of the ramen bridge and connected to the steel installed on the top of the column Construction method of composite ramen bridge.         a) arranging alternations on both sides according to the width and length of the pre-designed bridges, with pillars on a plurality of foundations between them;         b) installing a central point connecting steel on the pillar;        c) The concrete extension part is mounted on the alternating device installation part while connecting and connecting the point prestressed composite beam between the shift and the center point connecting steel, and extending the horizontal portion of the center point connecting steel and the steel of the central prestressed composite beam. Connecting the parts to each other;         d) placing reinforcing bar in the prestressed composite beam and the central point connecting steel installed between the shift and the center point connecting steel, and placing the reinforcing bar at the lower part of the horizontal part and placing the reinforcing bar at the predetermined position of the column Pouring concrete to form a haunting portion and placing concrete on the columns to install multi-span synthetic ramen bridges for alternating installation;         e) The prestressed composite beam, which is characterized in that the step of arranging the surroundings while removing the formwork installed for the installation of the ramen bridge, is installed in the center of the slab of the ramen bridge and connected to the steel installed on the top of the column Construction method of composite ramen bridge.

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