KR100693871B1 - Optimized end reinforcing structure of prestressed steel composite beam and construction method by using the same - Google Patents

Abstract

A prestressed steel composite beam manufacturing method by using a support of the end for a prestressed steel composite beam is provided to manufacture the prestressed steel composite beam easily and securely, and to resist horizontal force and vertical reaction force by minimizing steel, applying prestress to concrete of a lower flange with a prestressed concrete strand and efficiently arranging the prestressed concrete strands. A support of the end for a prestressed steel composite beam is installed at an end of a prestressed steel composite beam to resist horizontal compressive force and vertical reaction force, and composed of a lower plate(310) contacted to a lower part of lower flange concrete(200), an inner middle reinforcing plate(320) opened and formed between an upper part of the lower plate and a lower flange(130) of an I-steel beam(100), an upper vertical plate(330) formed between the lower flange and an upper flange(110) against vertical force and an anchor support plate arranged longitudinally in the lower flange concrete. The lower plate is arranged in a lower part of the I-steel beam with the inner middle reinforcing plate. Plural anchor support plates are extended longitudinally from the end of the prestressed steel composite beam to resist horizontal prestress.

Description

Prestressed steel composite beam manufacturing method using end support for prestressed steel composite beam {OPTIMIZED END REINFORCING STRUCTURE OF PRESTRESSED STEEL COMPOSITE BEAM AND CONSTRUCTION METHOD BY USING THE SAME}

FIG. 1A illustrates a conventional RPF beam (represtress preplex rigid composite beam) in cross section.

Figure 1b shows an end support installed at the end of the conventional RPF beam.

Figure 1c shows an end support of an open structure installed at the end of a conventional RPF beam.

Figure 1d shows an end support that is installed at the end of the RPF beam using a conventional steel bracket.

Figures 2a and 2b shows an installation assembly of the end support of the RPF beam of the present invention.

Figure 2c shows the assembly completion of the end support of the RPF beam of the present invention.

Figure 3 shows a detailed example of the internal intermediate reinforcing plate of the open form constituting the end support of the present invention.

Figure 4 shows a prestressed rigid composite beam is provided with the end support of the present invention.

FIG. 5 is a state diagram of a prestressed rigid composite beam having a concrete fixing block installed in the end support and the beam of the present invention.

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

100: type I steel 200: lower flange concrete

210: reinforcing bar 220: PC strand

230: concrete fixing block

300: end support 310: lower plate

320: open intermediate inner stiffener

330: upper vertical plate 340: fixed plate

350: fixing plate support plate

The present invention relates to a prestressed composite beam manufacturing method using an end support for the prestressed composite beam. More specifically, in the fabrication of prestressed steel composite beams using I-type steel, it is easy to fill and pour concrete for lower flange concrete, while effectively resisting horizontal compressive prestress (local horizontal force) and vertical reaction force by PC strand. The present invention relates to an end support installed at an end of a prestressed composite beam, which has improved construction properties, improved economic efficiency, and improved safety, and a method of manufacturing a prestressed composite beam using the same.

The conventional RPF beam 10 casts and cures the lower flange concrete 12 in the state where the primary prestress (the pre-flex load is applied to the I-type steel 11), and then removes the pre-flection load to elasticity of the I-type steel In the state in which the compressive stress or compressive prestress introduced into the lower flange concrete 12 is introduced by the restoring force, the secondary prestress is introduced into the lower flange concrete 12 using the non-bonded PC strand 13. It is a steel composite beam for bridges.

In particular, in the introduction of the secondary prestress, a plurality of non-bonded PC strands in advance are spaced around the lower flange of the I-type steel 11 formed inside the lower flange concrete before the lower flange concrete 12 is placed, as shown in FIG. (13, strand) is distributed and placed on the lower flange concrete, after placing and curing concrete for lower flange concrete, and then removing the preflection load (release) to introduce the primary prestress to the lower flange concrete. By tensioning a number of non-bonded PC strands to the lower flange concrete ends, the second prestress is further introduced in a full prestressing design, thereby securing the conventional preflex rigid composite beam (PF beam). While maintaining a low mold height, it is possible to secure economic efficiency sufficiently and tensile stress on the lower flange concrete There is a high structural safety, such as the occurrence of tensile cracks and excessive sagging of the lower flange concrete and the occurrence of excessive sagging and fatigue strength reduction does not occur.

At both ends of the lower flange concrete 12 in the RPF beam 10, the entire region of the lower flange concrete cross section uniformly behaves and is compressed at the ends of the lower flange 11a of the RPF beam 10 as shown in FIG. 1B. It consists of an inner support plate 23 consisting of a fixing plate 21 and the lower support plate 22, the upper inner support partition wall and the lower inner support partition wall, the outer support plate 24 and the upper support plate 25, the inner support The diaphragm 23, the outer support plate 24 and the upper support plate 25 were provided with an end support 20 (utility model registration No. 168565) having a through hole 26 formed therein for smooth filling of the lower flange concrete to be poured. .

However, in the case of such an end support 20, the end support is constructed in one box shape, and thus, the end support of the RPF beam is uneconomical, and it is composed of a large number of plates, which makes the work much more complicated. Residual deformation occurs, and it is difficult not only to fill and compact concrete inside the end support, but also due to poor adhesion between the outer support plate of the end support and the lower flange concrete, so that the lower flange concrete falls out of the RPF beam end. As this occurs, problems have been raised in economics, workability and structural performance.

1c shows a new end support 30 developed to solve this problem.

According to FIG. 1C, the end support 30 formed in the rigid of the end portion of the lower flange concrete 12 of the RPF beam 10 is

A lower plate 31 formed in contact with the lower flange concrete lower surface; An internal intermediate reinforcement plate 32 formed in various shapes to facilitate placing and filling of the lower flange concrete formed between the upper surface of the lower plate and the lower flange of the steel type; An upper vertical plate 33 formed between the lower flange and the upper flange; And a fixing plate 34 in which a plurality of non-bonded PC strand through holes are formed.

An open structure in which the attachment reinforcement 35 is further formed inside the lower flange concrete 12 to improve the adhesion between the end support and the lower flange concrete while resisting local stress at the beam end portion to the lower flange concrete. It can be said that the end support is made.

At this time, the end support 30 having the open structure is unstable to support the fixing plate of the non-bonded PC strand, that is, the left and right outer side of the fixing plate 34 directly compressive stress is transmitted to the lower flange concrete 12, not the fixing plate. As a result, there is a problem in that the lower flange concrete may be relatively low in strength, and workability may decrease somewhat due to the attachment reinforcing material 35 manufactured and installed in the field.

1D is also an end support 40 for the RPF beam 10.

That is, in particular, in the I-type steel 11 of the RPF beam 10, steel capable of supporting the fixing plate 41 on the lower flange 11a using a wide plate (about 60 to 80 cm) without using a plate. The bracket 42 is formed vertically, and the abdominal vertical support plate 43 and the lower steel support plate 44 are provided at the lower portion of the lower flange 11a to compress the horizontal pre-stress by the PC strand into the I-shaped steel cross section. It is a bracket reinforcement type end fixing plate reinforcing structure which reinforced the end fixing plate so that it can be supported only.

However, in the case of the bracket reinforcement type end fixing plate reinforcement structure, since the moment acting is small and the component member for supporting the fixing plate is installed at the end portion where the use of the I type steel is not necessary, There is a problem that the amount of steel increases as the width of the lower flange of the shaped steel is increased, resulting in an uneconomical factor in manufacturing the I-type steel. Therefore, there is a need to develop an improved end support for prestressed rigid composite beam that can solve the problems of the end supports.

The present invention is to achieve the above technical problem, an object of the present invention by minimizing the amount of steel for the I-type steel fabrication in the prestressed steel composite beam, by the horizontal compression prestress by PC strands Provides the end support of the prestress rigid composite beam which can be more effectively resistant to horizontal force and vertical reaction, but has improved end support construction and improved safety due to easy placement and filling of lower flange concrete. Developing a beam manufacturing method.

In order to achieve the above technical problem, the present invention is a local vertical reaction acting on the end of the prestressed steel composite beam is a lower plate, an open intermediate internal reinforcement plate in addition to concrete, the upper vertical plate is installed between the upper and lower flanges of I-shaped steel The local horizontal force is to be partially resisted by the lower plate, the open intermediate internal reinforcement plate and the I-type steel itself, and the remaining horizontal force is fixed by installing the fixing plate support plate so that the lower horizontal plate can contact the fixing plate. To do so.

Specifically

First, in fabricating the end support of the prestressed rigid composite beam, the fixing plate support plate can be installed directly on the lower plate.

That is, in order to lower the manufacturing cost of the I-type steel, I-type steel composed of a lower flange narrower than the center portion at the end was used without using a plate to secure the installation space of the fixing plate support plate constituting the end support. The fixing plate support plate can be installed to extend in the longitudinal direction.

At this time, the lower plate is made to be the same as the overall width of the lower flange concrete to install more fixing plate support plate, so that more PC strands can be installed in the prestressed steel composite beam, and the fixing plate support plate is also the lower flange of I type steel Since the vertical height of the resistor was increased to effectively resist the local horizontal force caused by the PC strand, by increasing the height of its formation by installing it on the lower plate, as a result, the cross-sectional size of type I steel was increased by increasing the amount of PC strand used and reducing the steel usage. To maximize the efficiency of the prestressed composite beam was maximized.

More specifically, the height of the fixing plate support plate is the same as the height of the fixing plate, that is, the entire height of the lower flange concrete including the thickness of the lower plate at the overall height of the lower flange and the coating thickness on the upper surface of the lower flange concrete. Forming to secure more effective bearing capacity when supporting the fixing plate, to maximize the advantages of the prestressed composite beam by distributing as many PC strands as possible from the bottom of the lower flange concrete to the top.

In addition, in the present invention, by installing a fixing plate support plate on the lower plate which does not cause a problem of residual stress due to welding, it is possible to secure the advantage that the structural performance of the I-type steel can be prevented in advance.

Second, the extension length of the fixing plate support plate installed in the lower plate is extended in the longitudinal direction more than the length of the lower plate to more effectively resist the horizontal force, the extended portion embedded in the lower flange concrete beyond the lower plate length The cross-sectional process facilitates the flow of stress and allows the stirrup reinforcement to be installed in the lower flange concrete at the center of the beam rather than the end of the beam.

Third, it is possible to form a communication hole for concrete communication in the fixing plate support plate to improve the attachment effect of the end support and the lower flange concrete.

Fourth, in order to more secure the integrity of the fixing plate support plate and the lower flange concrete to form a T-shaped vertical plate instead of a simple vertical plate to ensure a kind of shear connector function.

Fifth, in order to facilitate the welding operation for the installation of the fixing plate support plate and the fixed installation to the lower plate at least a pair of fixing plate support plates to be self-supported and installed in the lower plate to face each other by the c-shaped transverse connecting support material To make it possible. That is, the c-shaped transverse connecting support member is inserted into a through hole previously formed in the vertical plate, and fixed to the lower plate by a pair of fixing plate support plates, and then, both ends of the c-shaped transverse connecting support member. The dismantling was possible.

BRIEF DESCRIPTION OF DRAWINGS To describe the present invention more clearly and easily, the following describes the embodiments of the present invention in detail with the accompanying drawings.

2A and 2B show examples of the end support of the present invention, and FIG. 2C shows the assembly completion of the end support.

Figure 3 shows a detailed example of the internal intermediate reinforcing plate of the open form of the present invention.

Figure 4 shows the end of the prestressed rigid composite beam is provided with the end support of the present invention.

5 is a manufacturing state diagram of the prestressed rigid composite beam having a concrete fixing block installed inside the end support and the beam of the present invention.

The end support 300 of the prestressed steel composite beam of the present invention is installed at the end of the prestressed steel composite beam, as shown in Figure 2a, bridges the end of the I-type steel material 100 constituting the prestressed steel composite beam First, the lower plate 310 is prepared to support the base.

The lower plate 310 is to be in contact with the soul plate of the bridge bearing, or the lower plate 310 itself is to act as a soul plate located on the bridge bearing upper, acting on the end of the prestressed rigid composite beam It acts to transmit the vertical force to the bridge substructure through the bridge bearing, and connects with the fixing plate to transmit the horizontal force to some prestressed rigid beam.

Accordingly, as shown in FIG. 4, the lower flange concrete 200 constituting the prestressed rigid composite beam has the same width and is installed to extend in the longitudinal direction with a predetermined length, and is usually manufactured by processing a steel sheet.

The lower plate 310 is disposed in the lower portion of the I-type steel 100 through the internal intermediate reinforcing plate 320 of the open type to the I-type steel (100).

First, the I-type steel 100 is composed of the upper flange 110, the abdomen 120 and the lower flange 130, it is generally manufactured by welding by processing the steel sheet.

The upper vertical plate 330 is installed on both sides between the upper flange and the lower flange of the I-type steel 100 so that the resistance to the vertical force generated in the point portion can be enhanced.

At this time, the upper flange 110 and the lower flange 130 of the I-type steel 100 may be manufactured by using a single steel sheet as a plate, but the width of the central steel in order to increase the central rigidity of the I-type steel than the end stiffness It is larger than the width of the end steel.

The use of one plate has the advantage of simplifying the production, but the use of such a plate has a problem that the width of the upper and lower flanges must be considerably large, so in the present invention, in order to reduce the manufacturing cost of the I-type steel, the width of the end of the steel in the center It is assumed that I-type steels formed of upper and lower flanges narrower than the width are used, and a separate casing die is installed around the lower flange 130 of the I-type steel 100 to form the lower flange concrete 200. The concrete is poured inside, and cured to form the final lower flange concrete 200.

An internal intermediate reinforcing plate 320 of an open type, which is a kind of connecting plate, is formed between the bottom surface of the lower flange and the lower plate 310 of the I-type steel 100.

Specifically, in installing the inner middle reinforcement plate 320, when the outer plate (2) is shorter than the middle plate (1) and connected with the fixing plate, the inner middle reinforcing plate is in contact with the fixing plate and is applied to the horizontal force. The internal intermediate stiffener plate on the outside is partly spaced apart from the fixing plate so that the concrete for the lower flange concrete can be smoothly poured and filled into the free space.

In addition to the above-mentioned advantages, the adoption of the open middle intermediate reinforcing plate is caused by the hassle of the construction of penetrating the PC twisted line after drilling in the conventional abdominal vertical support plate, and the friction between the PC strand and the perforated vertical support plate. It prevents long-term safety factors in advance, and the space of PC strands is not blocked, so more PC strands can be placed smoothly, maximizing the advantages of prestressed steel composite beams.

Typically, since the lower flange concrete 200 has a plurality of PC strands arranged in the longitudinal direction, the horizontal secondary compression prestress (local horizontal force) introduced by such PC strands reaches hundreds of tons.

Fixing plate support plate is installed in order to effectively resist the compression prestress in the horizontal direction, the fixing plate support plate 350 is installed in the longitudinal direction of the I-type steel is a plurality of spaced apart from the upper surface of the lower plate (310).

The fixing plate support plate 350 may be installed at a predetermined length from the end of the prestressed rigid composite beam, but in the present invention, the fixing plate support plate 350 extends more than the extension length of the lower plate 310 in the longitudinal direction. It can be installed more effectively to resist the horizontal compression prestress (local horizontal force).

At this time, the portion extending toward the center portion through the lower plate of the fixing plate support plate is smoothly transferred to the inside of the lower flange concrete by smoothing the horizontal force of the fixing unit, while securing sufficient cover with the lower flange concrete at the central portion of the fixing plate support plate. Prevent local breakage and avoid interference with end reinforcement bars and center stir bars.

In addition, by placing the outermost fixing plate support plate inward from the corner of the fixing plate to prevent defects such as cracking and dropping due to insufficient thickness of concrete on the left and right sides of the lower flange concrete, and the height of the fixing plate supporting plate By making the resistance area as large as possible with the height of the fixing plate, the resistance efficiency against local horizontal force is increased. The fixing plate support plate is provided with a communication hole to secure the coupling of the lower flange concrete and the end support.

On the other hand, the reinforcing bar 210 is arranged closer to the outer side of the fixing plate than the other section and the spacing and diameter of the reinforcing bar 2 to 4 times from the end to further secure the coupling between the end support and the lower flange concrete Prevent concrete defects (cracking, peeling, dropping) and allow some resistance to local horizontal forces.

The lower side of the fixing plate is connected to the lower plate to fix the horizontal force on the lower plate, and the horizontal portion is shared by fixing the lower part of the abdomen, the lower flange of the I-type steel, and the middle plate of the internal intermediate reinforcement plate and the fixing plate support plate. .

The left and right sides of the fixing plate extend outwardly of the fixing plate support plate and are at least 7 cm smaller on each side than the width of the lower plate having the same size as the width of the lower flange concrete. To prevent this from happening, the concrete ensures a sufficient thickness of attachment, and the upper surface of the fixing plate matches the height of the fixing plate support plate to increase the fixing area, but at least 7cm smaller than the height of the lower flange concrete. In order to prevent defects such as cracks caused by the difference in relative stiffness in advance, the longitudinal reinforcement among the reinforcing bars reinforced at the end can be extended to the rear side in addition to the front of the fixing plate where horizontal compressive force by PC strand is introduced. After fixing the strand, it is possible to increase the coupling effect with the finishing material when finishing the fixing unit.

The fixing plate support plate 350 is generally welded directly to the upper surface of the lower plate 310, the size and weight of the fixing plate support plate 350 is not easy for the operator to handle, especially because it is made to extend more than the length of the lower plate 310 Length and weight require considerable effort and time in its installation.

Thus, the fixing plate support plate 350 of the present invention in the installation of a pair of fixing plate support plate 350 in the stand-up state to be installed in the lower plate 310 by the c-shaped transverse connection support material ( 400).

That is, first, a pair of fixing plate support plates are installed to face each other, but the through holes 410 are previously formed in the vertical plate.

The through hole 410 has a diameter that can be fitted to both ends of the c-shaped horizontal connection support member 400.

Both bent ends of the c-shaped transverse connecting support member 400 are inserted into the through hole 410 such that a pair of fixing plate support plates are supported by the c-shaped transverse connecting support member 400 on the upper surface of the lower plate 310. can do.

In this independent state, it is very easy to weld the fixing plate support plate to the upper surface of the lower plate, and there is an advantage that the length and weight of the fixing plate support plate carrying and installation workability can be enhanced.

At this time, the fixing plate support plate 350 may be made in the form of a vertical plate , as shown in Figure 2a, but may also be further improved adhesion to the lower flange concrete by making a vertical plate of the T-shaped cross section as shown in Figure 2b have.

By forming a communication hole in advance in the fixing plate support plate 350 so that the lower flange concrete placing concrete can be easily placed and filled at the same time, to secure the coupling of the end support and the lower flange concrete.

In addition, after welding the fixing plate support plate 350 to the lower plate 310, the c-shaped horizontal connecting support member can be easily disassembled from the fixing plate supporting plate as shown in FIG. Make sure

The fixing plate support plate 350 described above will generally be installed about four, depending on the cross-sectional size of the I-type steel, two or six will be installed in a special case.

The lower plate 310, the inner middle reinforcement plate 320, the fixing plate support plate 350, the upper vertical plate 330, a part of the PC strand wire 220 and reinforcing bar 210 to the lower flange concrete 200 as shown in FIG. The bottom surface of the lower plate is supported by the bridge support so that both ends of the prestressed rigid composite beam can be effectively supported by the bridge support.

5 is a part of the PC strand that is a tension member 220 in the concrete fixing block 230 by installing the concrete fixing block 230 at a distance of about 10% to 25% of the ground (bridge support distance) from the point of the RPF beam. It is a schematic diagram showing the state of fabrication of prestressed steel composite beams to improve the resistance efficiency against the compressive stress at the point end by dispersing, tensioning, and fixing them, so that more PC strands can be arranged.

In this case, the fixing block 230 may be formed of concrete, but the material is not limited thereto, and the compressive stress introduced by the PC stranding wire is merely pointed by tensioning and fixing a portion of the PC stranding wire 220 to the fixing block as described above. It is possible to prevent the concentration of the lower flange concrete from exceeding the allowable compressive stress.

When the fixing block 230 is installed and a part of the PC strand is stretched and fixed to the concrete fixing block to introduce a compressive force to the lower flange concrete, the compressive force is applied to the lower flange concrete by the preflection and release of the I-type steel, if necessary. Omitting the introduction process, and compressing force is introduced into the lower flange concrete by PC strand only, so that the workability can be improved when manufacturing the prestressed steel composite beam.

In manufacturing the prestressed steel composite beam by the end support of the prestressed steel composite beam of the present invention, while optimizing the amount of steel of I-shaped steel, it is possible to effectively disperse and arrange the PC strands as much as possible, and prestressed steel composite beam At the end, it is possible to more effectively resist local horizontal force, and it is possible to manufacture prestressed steel composite beam which is easy to manufacture and safe and economical.

An embodiment of the present invention described above and illustrated in the drawings should not be construed as limiting the technical spirit of the present invention. Those skilled in the art of the present invention can change and change the technical idea of the present invention in various forms. Therefore, such improvements and modifications fall within the protection scope of the present invention as long as it will be apparent to those skilled in the art.

Claims (9)

Resist the horizontal compressive force and vertical reaction force by PC strands at the end of prestressed steel composite beam using I-type steel whose width of upper and lower flanges is made smaller at the end than the center to improve economic performance by reducing steel consumption. In installing the end support for the end support, the bottom plate formed in contact with the upper surface of the lower flange concrete lower surface; An internal intermediate reinforcing plate formed between an upper surface of the lower plate and a lower flange of the I-type steel; An upper vertical plate formed between the lower flange and the upper flange of the I-type steel; A fixing plate having a plurality of through holes formed therein; Including; fixing plate support plate disposed in the lower flange concrete in the longitudinal direction, The lower plate is made to have the same width as the lower flange concrete lower surface, The fixing plate is a part of the abdomen and the lower flange of the I-type steel, the inner middle of the reinforcing plate to be in contact with the center plate, the fixing plate support plate, the bottom surface is welded to the lower plate, the left and right sides extend outside the fixing plate support plate, the upper surface The width of the lower flange concrete at least 14 cm, the height is formed 7 cm to match the height of the fixing plate support plate, so that the reinforcing bars in the longitudinal direction through the left and right sides and the upper surface, The fixing plate support plate is formed on the lower plate to match the height of the fixing plate in the inner width of the fixing plate on the upper surface of the lower plate, but extends more than the lower plate in the direction of the center of the I-type steel in the lower flange concrete Buried, but the portion that is embedded in the lower flange concrete beyond the length of the lower plate to the upper and lower sides of the cross-sectional treatment and to form a communication hole, The inner intermediate reinforcement plate of the open type is composed of three plates connected to the lower plate, but the middle plate (1) is longer than the outer plate (2) to be in contact with the fixing plate and between the outer plate and the fixing plate Is spaced apart in the longitudinal direction, so that the PC strand is inserted in the longitudinal direction between the three plates, An end support for the prestressed rigid composite beam, characterized in that the spacing and diameter of the reinforcing bar is formed more densely and larger than the other section over a section 2 to 4 times the height of the lower flange concrete from the end to the outside of the fixing plate. delete delete The end support of the prestressed rigid composite beam according to claim 1, wherein the fixing plate support plate is formed of a T-type vertical plate. According to claim 4, The fixing plate support plate is to be installed in the lower plate in the state in which the fixing plate support plate, to form a transverse connection support material between the vertical plate in a state in which a pair of vertical plate spaced apart, The lateral connection support member is manufactured in a c-shape to be inserted into a through hole formed in the vertical plate, and the fixing plate support plate is fixed to the lower plate while both ends of the c-shaped lateral connection support member are installed in the through hole. The end support of the prestressed rigid composite beam, characterized in that after the c-shaped transverse connecting member is closed to disassemble from the fixing plate support plate. After loading the pre-flection load on the I-type steel, the lower flange concrete is formed around the lower flange of the I-type steel, and then the compressive stress is introduced to the lower flange concrete by removing the pre-flection load and by PC strand. In manufacturing the RPF beam, The end support of claim 1 is installed at an end of the RPF beam, After loading the pre-flection load on the I-type steel, and then forming the lower flange concrete, the pre-flection load is removed so that the compressive stress is introduced to the lower flange concrete, the entire PC strand is tensioned to the fixing plate of the end support A prestressed steel composite beam manufacturing method using an end support for a prestressed steel composite beam, characterized in that the fixing to produce an RPF beam. After loading the pre-flection load on the I-type steel, the lower flange concrete is formed around the lower flange of the I-type steel, and then the compressive stress is introduced to the lower flange concrete by removing the pre-flection load and by PC strand. In manufacturing the RPF beam, The end support of claim 1 is installed at an end of the RPF beam, After loading the pre-flection load on the type I steel, after forming the lower flange concrete, the pre-flection load is removed so that the compressive stress is introduced into the lower flange concrete, but a portion of the PC strand is fixed to the end support Tension is fixed to the plate, and part of the PC strand is drawn out to the upper surface of the lower flange concrete, and then tensioned and fixed in the concrete anchoring block installed at 10% to 25% of the space from both ends of the RPF beam to produce an RPF beam. A prestressed steel composite beam manufacturing method using an end support for a prestressed steel composite beam. In forming the lower flange concrete around the lower flange of the I-type steel, and then to produce a prestressed steel composite beam is produced so that the compressive stress is introduced into the lower flange concrete by PC strands, The end support of claim 1 is installed at the end of the prestressed rigid composite beam, After forming the lower flange concrete in the I-type steel, a part of the PC strand is tension-fixed to the fixing plate of the end support, and a part of the PC strand is drawn out to the upper surface of the lower flange concrete, the gap between the both ends of the prestressed steel composite beam A prestressed composite beam manufacturing method using an end support for a prestressed composite beam, wherein the prestressed composite beam is fabricated by tensioning and anchoring the concrete fixing block installed at 10% to 25% apart. delete

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