KR100944241B1 - Composite girder used stell-concrete for upper lower reinforcing endurance force of continuity of prestress bridge - Google Patents

Abstract

The present invention relates to a steel-concrete composite girder, and more particularly, filling and fixing between the girder in succession to the concrete portion fixed to the bottom of each girder, which is a connection portion on the continuous point portion located on the pier or alternating bridge of the composite bridge By increasing the composite section of the concrete section and introducing prestress, the deflection and bending resistance against the working load on the continuous point section are increased to increase the load capacity, and furthermore, to resist the tensile stress acting on the upper section of the concrete section. By reinforcing steel plate, which is a continuous reinforcement member for continuous point portion connecting the upper part of each girder, reinforce the upper load capacity to resist the tensile stress caused by the load state of the continuous girder, and reinforcement for more efficient load capacity By using high tensile steel sheet on the upper part of the member reinforcing steel sheet Prestress is applied to the upper concrete reinforcement located under the steel plate and high tensile steel plate to compensate for the characteristics of concrete material vulnerable to tension to realize long span of bridges and to achieve full continuity. Regarding steel-concrete composite girders for reinforcement,

Looking at the main configuration of the present invention for implementing this,

H-girder girders (girder) spaced apart on the continuous point portion located on the pier or alternating bridge of the composite bridge; A first block fixed to the lower portion of each girder, which is a connecting portion on the continuous point portion, and a second block that is fixed to each end of the girder continuous to the first block and is expanded between the end portions of the girder; Containing, concrete portion to enhance the load capacity on the continuous point portion; And a reinforcing member fixed to the upper part of each girder and the upper part of the second block to reinforce the upper load capacity on the continuous point portion and to introduce pre-stress.

Continuous point, parent moment, positive moment, reinforcement member, steel bracket, shear connector, support member, auxiliary support member

Description

COMPOSITE GIRDER USED STELL-CONCRETE FOR UPPER LOWER REINFORCING ENDURANCE FORCE OF CONTINUITY OF PRESTRESS BRIDGE}

The present invention relates to a steel-concrete composite girder, and more particularly, filling and fixing between the girder in succession to the concrete portion fixed to the bottom of each girder, which is a connection portion on the continuous point portion located on the pier or alternating bridge of the composite bridge By increasing the composite section of the concrete section and introducing prestress, the deflection and bending resistance against the working load on the continuous point section are increased, thereby increasing the load capacity.

Furthermore, to resist the tensile stress acting on the upper part of the concrete part, the reinforcing steel plate, which is a continuous reinforcement member on the continuous point part connecting the upper part of the concrete part and the upper part of each girder, is installed to resist the tensile stress generated according to the load state of the continuous girder. Reinforce the upper load capacity so that

In addition, by using high tensile strength steel plate on the upper part of reinforcing member reinforcing steel plate and prestressing on the upper concrete reinforcing part located under the high tensile steel plate for more efficient load capacity reinforcement, it is possible to make long bridge between bridges by compensating for the characteristics of concrete material vulnerable to tension. And a steel-concrete composite girder for upper and lower load bearing reinforcement on continuous point portions of a prestressed composite bridge that can achieve complete continuity.

In general, small and medium-sized bridges between 25 and 45 meters are being constructed in Korea, mainly for construction and economic reasons. Concrete bridges such as pre-stress concrete (PSC) girders are constructed. The same steel bridge is applied.

Utility Model Registration No. 20-0191363 (Registered Aug. 16, 2000) registered by Gumin Min, a utility model right holder for the steel box girder bridge, is a steel box-shaped cross-section structure with improved rigidity near the inner point by concrete filling. Bridges are designed to cope with large moments because the magnitudes of the maximum static moment and the absolute maximum parent are significantly different. Therefore, when the bridge is designed to be uniform in cross section, the section of the constant moment section is designed to be uneconomically large. for,

The stiffness is increased by filling the lower part of the cross section of the concrete, which is advantageous for compressive force, at the position corresponding to about 10 percent of the span length to the left and right at the inner point where the absolute maximum moment is much larger than the maximum static moment. It is proposed that the entire section can be equalized with the minimum cross section designed to correspond to the maximum static moment, thereby reducing the height by about 20 percent from the height of the existing steel box-shaped isometric section.

However, the registered utility model can reduce the height of the bridge by reducing the height of the steel box-shaped back section to some extent as described above, but there is a limit in reducing the height by the large cross section which is the basic characteristic of the steel box-girder. There are still difficulties in lightening the bridge,

Therefore, due to the difficulty of implementing a lightweight bridge, it is difficult to realize the long and long bridges.

In particular, since the work is done in the inner space of the steel box girder for placing concrete at the inner point of the steel box girder, the work is not easy and there are many difficulties for the workers. There is a problem in that it is uneconomical due to the need for personnel and equipment.

On the other hand, as described above, in order to overcome the relative economic differences between steel bridges and concrete bridges, many bridges using H-beams in the middle span have been proposed.

However, since H-section steel has a small cross stiffness, pre-stressing or cross-sectional reinforcement is required to be applied to long spans. In case of continuous bridge construction, the upper concrete cross section is ignored by the parent moment generated at the continuous point. Therefore, it should be applied to the edge of continuous point.

Accordingly, the patent holder of Dongyang General Industries Co., Ltd. No. 0372772 (registered on Feb. 6, 2003) "The construction method of multi-span continuous preplex composite bridge" is the lower flange of steel I type girder (2) (hereinafter referred to as 'girder') (2c After curing (curing) by pouring the lower flange concrete (3) in the form of enclosing), remove the load (Pf) applied to the girder (2) to return the deflection deformation bent down to the original state

Since the cross-sectional area of the lower flange concrete wrapped around the lower flange of the girder as much as the thickness of the lower flange included in the lower flange concrete is lost, to compensate for the height of the concrete placed on the lower flange of the girder by the lost cross-sectional area. Causes economic losses for

In addition, in order to cure the lower flange concrete, concrete should be poured and cured only integrally with the lower flange of the girder, so that the work is not easy and economical, which requires a lot of manpower and equipment to install the bridge pier or shift of the bridge. There was a problem to bear the loss.

The present invention has been made to solve the above problems, and is filled and fixed between the girder in succession to the concrete portion fixed to the lower portion of each girder that is a connection portion on the continuous point portion located on the bridge or alternating bridge of the composite bridge By increasing the composite section of the concrete section and introducing prestress, the deflection and bending resistance against the working load on the continuous point section are increased, thereby increasing the load capacity.

Furthermore, to resist the tensile stress acting on the upper part of the concrete part, the reinforcing steel plate, which is a continuous reinforcement member on the continuous point part connecting the upper part of the concrete part and the upper part of each girder, is installed to resist the tensile stress generated according to the load state of the continuous girder. Reinforce the upper load capacity so that

In addition, by using high tensile strength steel plate on the upper part of reinforcing member reinforcing steel plate and prestressing on the upper concrete reinforcing part located under the high tensile steel plate for more efficient load capacity reinforcement, it is possible to make long bridge between bridges by compensating for the characteristics of concrete material vulnerable to tension. It is an object of the present invention to provide a steel-concrete composite girder for the upper and lower load capacity reinforcement on the continuous point portion of the prestressed composite bridge can achieve a complete serialization.

In addition, the present invention is a support member for more securely maintaining the load capacity enhanced by the composite section formed by the lower portion of the continuous point portion, that is, the concrete first block and the bottom of each girder, Another object of the present invention is to provide a steel-concrete composite girder for reinforcing the upper and lower load capacity on the continuous point portion of the prestressed composite bridge can restrain the load capacity enhanced by the composite section by constraining.

Steel-concrete composite girders for reinforcement of upper and lower load capacity on the continuous point part of prestressed composite bridge according to the present invention

H-girder girders (girder) spaced apart on the continuous point portion located on the pier or alternating bridge of the composite bridge; A first block fixed to the lower portion of each girder, which is a connecting portion on the continuous point portion, and a second block continuous to the first block and fixed between the respective girder ends, and extending a composite section on the continuous point portion. A concrete part that enhances the load capacity on the continuous point part; And a reinforcing member fixed to the upper part of each girder and the upper part of the second block to reinforce the upper load capacity on the continuous point portion and to introduce pre-stress.

It is preferable that a reinforcing steel sheet for a tension member installed to resist tensile stress acting on the upper portion of the continuous point, and a high-tensile steel sheet for introducing prestress is provided on the reinforcing steel sheet.

More preferably, the concrete part is characterized in that the expandable concrete for maximizing the composite effect of the steel and concrete.

Furthermore, a support member is further provided to restrain both ends of the first concrete block to resist the stress acting between the lower portion of each girder and the joint between the first concrete block and the concrete.

The support member is preferably a steel bracket having a bent portion corresponding to each joining portion.

And it is preferable that the coupling member for fixing each joint of the girder, the concrete portion and the reinforcing member is a shear connector,

In addition, the bottom of each girder, the coupling member for fixing each of the joints of the concrete block first block both ends and the support member is a shear connection connector.

Meanwhile, both ends of the first concrete block have a minimum cross-sectional area,

The support member is preferably formed to correspond to the shape of both ends of the concrete block first block.

The support member further includes an auxiliary support member padded on an outer surface thereof.

Concrete part fixed to the lower part of each girder which is the connection part on the continuous point part located on the pier or alternating bridge of the composite bridge by the steel-concrete compound girder for reinforcing the upper and lower load capacity on the continuous point part of the prestressed composite bridge according to the present invention. Filled and fixed between each girder in succession to the expansion of the composite section of the concrete section and introducing prestress to increase the deflection and bending resistance to the working load on the continuous point portion to enhance the load capacity,

Furthermore, to resist the tensile stress acting on the upper part of the concrete part, the reinforcing steel plate, which is a continuous reinforcement member on the continuous point part connecting the upper part of the concrete part and the upper part of each girder, is installed to resist the tensile stress generated according to the load state of the continuous girder. Reinforce the upper load capacity so that

In addition, by using high tensile strength steel plate on the upper part of reinforcing member reinforcing steel plate and prestressing on the upper concrete reinforcing part located under the high tensile steel plate for more efficient load capacity reinforcement, it is possible to make long bridge between bridges by compensating for the characteristics of concrete material vulnerable to tension. And full sequencing.

The present invention further constrains and simultaneously restrains the supporting members to both end portions of the first block of the concrete part to more reliably maintain the load capacity enhanced by the composite block formed by the lower part of the continuous point part, that is, the first block of the concrete part and the lower part of each girder. By doing so, it is expected that the load capacity enhanced by the composite section can be more firmly maintained.

Meanwhile, the concrete part that acts as prestress when constructing steel-concrete composite girders can be manufactured independently of the girder, and thus, all the sections of the bridge can be factory-manufactured and modularized to shorten the construction period and ease of construction. do.

Hereinafter, the accompanying drawings according to the steel-concrete composite girders for the upper and lower load bearing reinforcement on the continuous point portion of the pre-stressed composite bridge of the present invention,

1 is a side view of a steel-concrete composite girder according to the present invention,

Figure 2 is a cross-sectional side cross-sectional view of the steel-concrete composite girder according to the present invention in the direction B-B of Figure 1,

3 is a side view and an enlarged view showing a support member of a steel-concrete composite girder according to the present invention,

4 and 5 are perspective views showing the support member and the reinforcing member of the steel-concrete composite girder according to the present invention.

In the present specification, the 'block' is referred to as the first block and the upper side is divided by the virtually divided partition line (dotted line on the drawing) formed by the concrete part, and the upper side is referred to as the second block.

As shown in FIGS. 1 and 2, the steel-concrete composite girder for the upper and lower load bearing reinforcement on the continuous point portion of the prestressed composite bridge according to the present invention is

H-girder girders (10) installed spaced apart on the continuous point portion (C) located in the pier (A) or alternating (A) of the composite bridge; A first block 20a fixed to a lower portion of each girder 10a, 10b, which is a connecting portion on the continuous point portion C, and successively connected to the first block 20a, and each girder 10a, 10b. A concrete part 20 fixed to the end and including a second block 20b for expanding the composite section on the continuous point portion C, to increase the load capacity on the continuous point portion C; And a reinforcing member 30 fixed to an upper portion of each of the girders 10a and 10b and an upper portion of the second block 20b to reinforce the load capacity of the continuous point portion C and to introduce pre-stress. It is made to include.

In the steel-concrete composite girder for reinforcing the upper and lower load capacity on the continuous point portion of the prestressed composite bridge according to the present invention, the girder 10 is

As shown in Figure 1 and 2 'H' or 'I' section girders (H) or steel (I) section girders installed spaced apart on the continuous point portion (C) located on the pier (A) or alternating (A) of the composite girder bridge ( 10),

The girders 10a and 10b are symmetrical along the longitudinal direction on the continuous point portion C and are spaced apart at regular intervals to form a space portion on the continuous stopping portion C, and the space portion thus formed. It is filled with concrete acting as a prestress to form a concrete portion 20 on the continuous point portion (C).

And the reinforcement 12 is reinforced for the concrete portion 20 to be described below as shown in Figures 1 and 3

Reinforcing bars 12 are connected in the lateral direction between the respective girders 10a and 10b. In this case, the reinforcing bars 12 are welded to ends of the respective girders 10a and 10b so that the concrete sections 20 Reinforcement for the second block 20b,

For the first block 20a of the concrete portion 20 is welded in the transverse direction to the inner surface of each support member 40 which will be described below, and reinforcement,

In addition, the reinforcing bars 12 for supporting each of the reinforcing bars 12 in the transverse direction are reinforced in the longitudinal direction and connected by welding each of the reinforcing bars 12 in the transverse direction to reinforce the load capacity of the concrete part 20. Done.

In the steel-concrete composite girder for reinforcing the upper and lower load capacity on the continuous point portion of the prestressed composite bridge according to the present invention, the concrete portion 20

It is fixed to the lower end of each girder (10a) (10b) and the end of each girder (10a) (10b) in order to enhance the load capacity by the cross section enlarged on the continuous point portion (C),

As shown in FIGS. 1 and 2, the concrete part 20 is formed of a first block 20a and a second block 20b.

The first block 20a of the concrete part 20 is fixed to the bottom of each girder 10a, 10b to form a composite section at the bottom of the continuous point portion C, and the continuous point by the composite section thus formed It is introduced to act as pre-stress to the parent moment acting on the lower part (C).

That is, the upper surface of the composite section formed by the first block 20a of the concrete portion 20 and the lower portion of each girder 10a, 10b, that is, the lower portion of the girder 10a, 10b is compressed. Tensile stress is applied to the upper portion of the stress, corresponding to the respective girder (10a) (10b) under the compressive stress to place the concrete in consideration of the characteristics of the concrete strong compressive force and the tensile stress acts By introducing the reinforcing steel plate 32 and the prestress to the top of the girder (10a) (10b) so that the lower load capacity of the continuous point portion (C) can be reinforced,

In addition, in the joint portion where the first block 20a of the concrete portion 20 and the lower portion of each girder 10a, 10b of the concrete section 20 are in contact with each other, the joint portion behaves together by mutual adhesion and frictional resistance to act on the joint portion. It becomes possible to resist stress more efficiently.

The second block 20b of the concrete portion 20 is continuously formed on the upper portion of the first block 20a, and fixed to the end portions of the respective girders 10a and 10b so that the upper portion of the continuous point portion C is formed. To form a composite cross section,

The tensile stress acting on the upper portion of the continuous point portion C by the action load by the composite section thus formed.

In other words, in response to the tensile stress acting as the second block of the concrete part 20 fixed to the ends of each girder 10a and 10b integrally behaves, the characteristics of the concrete that are strong against the compressive force are similar to those of the first block. By placing concrete in consideration, it effectively resists the working stress of the continuous point portion C.

Furthermore, it is preferable that the first and second blocks 20a and 20b of the concrete part 20 use expandable concrete.

This prevents degradation of durability due to dry cracking by mixing the expansion material in concrete to prevent the phenomenon of dry cracking in concrete due to the decrease in volume due to reaction with water during curing of general concrete,

At the same time, it is possible to maximize the composite action of the steel and concrete during curing of the concrete portion 20.

In the steel-concrete composite girder for reinforcing the upper and lower load capacity on the continuous point portion of the prestressed composite bridge according to the present invention, the reinforcing member 30 is

As shown in Figure 1 and 2 is fixed to each upper portion of each girder (10a) (10b) and the concrete portion, to reinforce the upper load capacity of the continuous point portion,

The reinforcing member 30 is a reinforcing steel plate 32 for the tension member installed so as to resist the tensile stress acting on the continuous point portion,

The reinforcing steel sheet 32 is provided with a high-tensile steel sheet 34 for introducing prestress,

The reinforcing member 30, the reinforcing steel plate 32 is the upper portion of the second block (20a) of the concrete portion 20 fixed to the upper end of each girder (10a) (10b) and the end of each girder (10a) (10b) It is preferable to use a tensioning member so as to be resistant to the tensile stress acting on the upper portion of the continuous point (C) together with the composite section formed by the second block (20a) of the concrete portion 20 is fixed to ,

In addition, the reinforcing member 30, the reinforcing steel plate 32, the upper portion of the reinforcing member 30, high-tensile steel sheet 34 is installed, the high-strength steel sheet 34 is the continuous point portion (C) upper, that is, the concrete portion 20 To introduce prestress in the upper part,

The reinforcing steel plate 32 and the high tensile strength steel sheet 34 to reinforce the continuous load portion (C) upper load capacity.

That is, the reinforcing member 3 is a continuous point portion (C) together with the composite section formed by the second block of the concrete portion (C) acting as prestress against the tensile stress acting on the continuous point portion (C) To resist the tensile stress acting on the upper part to reinforce the load capacity of the upper portion of the continuous point (C),

Furthermore, the reinforcing steel plate 32 as the reinforcing member 30 is fixed to the respective girders 10a and 10b, and the high-strength steel sheet 34 for introducing prestressing is installed on the reinforcing steel plate 32 to form upper concrete. By introducing the prestress in the reliability of the load-bearing reinforcement of the upper portion of the continuous point (C) can be further increased.

In addition, the bottom plate D cast by concrete is placed on each upper portion of each of the girders 10a and 10b, the concrete portion 20, the second block 20b, and the reinforcing member 30.

By expanding the composite section formed at the connection part on the continuous point part of the bridge or alternating part of the composite bridge by the steel-concrete composite girder for reinforcing the upper and lower load capacity on the continuous point portion of the prestressed composite bridge as described above, To increase the load capacity by increasing the deflection and bending resistance against the working load on the continuous point portion,

Furthermore, the tension generated according to the load state of the continuous girder by installing a reinforcing steel plate, which is a continuous reinforcing member, is a reinforcing member on the continuous point portion connecting the upper part of the concrete part and the upper part of each girder to resist the tensile stress acting on the upper part of the concrete part. Reinforce the upper load capacity to resist the stress,

In addition, by using high tension steel plate on the upper part of the reinforcing steel plate, which is the reinforcing member, the prestressing is applied to the reinforcing member reinforcing steel plate and the upper concrete located under the high tensile steel plate to compensate for the characteristics of concrete materials vulnerable to tension. It is expected that implementation and complete serialization will be possible.

In the steel-concrete part composite girder for reinforcing the upper and lower load capacity on the continuous point portion of the prestressed composite bridge according to the present invention, the support member 40 is

As shown in FIGS. 3 and 4, the first block 20a of the concrete portion 20 to resist stress acting between the lower portion of each girder 10a and 10b and the joint portion with the concrete portion 20. ) Both sides of the cross section are constrained,

That is, the first block of the concrete portion 20 to resist the shear stress acting between the lower portion of each girder (10a) (10b) and the junction of the first block (20a) of the concrete portion 20 ( 20a) Both sides of the girder 10a and 10b and the first block 20a of the concrete portion 20 are fixed to both sides of the cross section to restrain both end portions.

The support member 40 is introduced to more efficiently resist the shear force generated by the stresses interacting at the joints between the lower portions of the girders 10a and 10b and the concrete portion 20,

It is possible to more reliably maintain the load capacity enhanced by the composite section formed by the lower portion of the continuous point portion, that is, the first block of the concrete portion and the lower portion of each girder.

Furthermore, it is preferable that the support member 40 is a steel bracket 40a having a bent portion formed to correspond to a joint portion between the first block 20a of the concrete portion 20 and the respective girders 10a and 10b, respectively. ,

In addition, the steel bracket 40a uses the same material as the girders 10, 10a and 10b, that is, the H-shaped steel girders, thereby minimizing mutual resistance due to characteristics of heterogeneous materials and more effectively resisting the working stress. It becomes possible.

On the other hand, as shown in Figure 5 the cross section of both sides of the first block (20a) of the concrete portion 20 is a sudden cross-sectional change occurs in this case, the stress concentration at the cross-sectional change point occurs, the cross-sectional change point is To prevent becoming vulnerable

The cross-sectional areas of both ends of the first block 20a of the concrete part 20 are formed to have a minimum cross-sectional area, the shape of which forms a constant gradient in a direction away from each other along the longitudinal direction of each girder 10a, 10b. Preferably,

Furthermore, the support member 40 is also formed such that the junctions with both end surfaces of the first block 20a of the concrete part 20 correspond to the shape of each end of the first block 20a of the concrete part 20. ,

By minimizing the concentration of stress at the point of rapid cross-sectional change, a more rational steel-concrete composite girder is realized.

In the steel-concrete composite girder for reinforcing the upper and lower load capacity on the continuous point portion of the prestressed composite bridge according to the present invention, the coupling member 50 is

It is preferable to be a shear connector for fixing each joint of the girder 10a, 10b, the concrete portion 20a, 20b and the reinforcing member 30,

The shear connecting connector 50a has a 'b' shape or a 'Z' at a lower portion, an end portion of each girder 10a and 10b and an upper portion of each girder 10a and 10b or a lower portion of the reinforcing member 30. 'Fixed by a stud bolt using a shape angle or the like, the lower part of each girder 10a, 10b, the upper part of the concrete part 20, the first block 20a, and the respective girder 10a, 10b. An end portion and both ends of the second block 20b of the concrete part 20, an upper part of each girder 10a and 10b, an upper part of the second block 20b of the concrete part 20, and the reinforcing member 30. Each joint of the is fixed.

In other words, each junction of the girder 10a and 10b, the concrete part 20, the first and second blocks 20a and 20b and the support means 30 is fastened by the shear connection connector 40a. And integrally behave, and transmit the prestress synthesized by the concrete part 20 and the support means 30 to the girder 10.

In addition, the coupling member 50 for fixing the lower portion of each girder (10a) (10b), both ends of the concrete portion 20, the first block (20a) and each joint of the support member 40 also shear connection connector It is preferable that it is (50a),

Coupling method is the same as described above and the function is also the same, and description thereof will be omitted.

In the steel-concrete composite girder on the continuous point portion of the prestressed composite bridge according to the present invention, the auxiliary support member 42 is

As shown in FIGS. 4 and 5, in order to reinforce the support between the supporting member 40 and the joint portions of both ends of the concrete block 20 and the first block 20a, the lower portion of the supporting member 40 is provided inside the support member 40. Formed by padding,

The auxiliary supporting member 42 is preferably fixed by a fixing method, such as by welding at the joint portion between the support member 40 and the both ends of the concrete block 20, the first block (20a).

In the above description, the steel-concrete composite girder for load-bearing reinforcement on the continuous point portion of the prestressed composite bridge of the present invention has been described with reference to the accompanying drawings, but the present invention can be variously modified and changed by those skilled in the art. And, such variations and modifications should be construed as being included in the scope of the invention.

1 is a side view of a steel-concrete composite girder according to the present invention,

Figure 2 is a cross-sectional side cross-sectional view of the steel-concrete composite girder according to the present invention in the direction B-B of FIG.

3 is a side view and an enlarged view showing a support member of a steel-concrete composite girder according to the present invention;

4 and 5 are perspective views showing the support member and the reinforcing member of the steel-concrete composite girder according to the present invention.

<Explanation of Signs of Major Parts of Drawings>

A: Pier, Alternate C: Continuous Branch

D: Bottom plate 10,10a, 10b: Each girder

12: rebar 20: concrete part

20a: first block 20b: second block

30: reinforcing member 32: reinforcing steel sheet

34: high tensile steel sheet 40: support member

40a: steel bracket 42: auxiliary support member

50: coupling member 50a: shear connection connector

Claims (10)

H-girder girders (girder) spaced apart on the continuous point portion located on the pier or alternating bridge of the composite bridge; A first block fixed to the lower portion of each girder, which is a connection portion on the continuous point portion, and And a second block continuous to the first block and fixed between the respective girder ends to expand the composite section on the continuous point portion. Concrete portion to enhance the load capacity on the continuous point portion; And Continuous point injuries of the prestressed composite bridges, which are fixed to the upper part of each girder and the upper part of the second block, and reinforcement members for reinforcing upper load capacity on the continuous point portion and introducing pre-stress. Steel-concrete composite girders for reinforcement. The method of claim 1, wherein the reinforcing member A reinforcing steel sheet for tension member installed to resist the tensile stress acting on the upper part of the continuous point, Steel-concrete composite girder for the upper and lower load capacity reinforcement on the continuous point portion of the prestressed composite bridge, characterized in that the upper portion of the reinforcing steel sheet is provided with a high-tensile steel sheet for introducing the prestress. The method of claim 1, wherein the concrete portion Steel-concrete composite girder for reinforcing the upper and lower load capacity on the continuous point portion of the prestressed composite bridge, characterized in that the expandable concrete to maximize the composite effect of the steel and concrete. The method according to any one of claims 1 to 3, An upper part of the continuous point portion of the prestressed composite bridge is further provided with a supporting member for restraining both ends of the first concrete block to resist the stress acting between the lower portion of each girder and the joint between the first block and the concrete portion. And steel-concrete composite girders for lower load bearing reinforcement. The method of claim 4, wherein The support member is a steel-concrete composite girder for reinforcing the upper and lower load capacity on the continuous point portion of the prestressed composite bridge, characterized in that the steel bracket having a bent portion corresponding to each joint. The method according to any one of claims 1 to 3, Coupling members for fixing the respective girder, the concrete portion and each joint of the reinforcing member is a shear connector (shear connector) characterized in that the steel for reinforcing the upper and lower load capacity on the continuous point portion of the prestressed composite bridge -Concrete composite girder. The method of claim 4, wherein The upper and lower load bearing reinforcement on the continuous point portion of the prestressed composite bridge, characterized in that the coupling member for fixing the lower portion of each girder, both ends of the first portion of the concrete portion and each joint of the support member is a shear connection connector. Steel-concrete composite girder for The method of claim 4, wherein Steel-concrete composite girder for reinforcing the upper and lower load capacity on the continuous point portion of the prestressed composite bridge, characterized in that both ends of the first block of the concrete portion has a minimum cross-sectional area. The method of claim 8, The support member is a steel-concrete composite girder for reinforcing the upper and lower load capacity on the continuous point portion of the prestressed composite bridge, characterized in that formed to correspond to the end shape of both sides of the first portion of the concrete portion. The method of claim 4, wherein The support member is a steel-concrete composite girder for reinforcing the upper and lower load capacity on the continuous point portion of the prestressed composite bridge, characterized in that the support member is further provided on the outer surface.

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