KR101240581B1 - End support apparatus using cross- shaped tendon anchorage plate, prestressed concrete beam, and construction method using the same - Google Patents

Abstract

PURPOSE: An end support apparatus using a cross-shaped tendon anchorage plate, a prestressed concrete beam, and a construction method using the same are provided to effectively support an anchor plate and to easily pour concrete to form a lower flange. CONSTITUTION: An end support apparatus using a cross-shaped tendon anchorage plate comprises a lower plate(310), an inner intermediate reinforcement plate(320), a cross-shaped anchor plate support plate(350), and an anchor plate(340). The inner intermediate reinforcement plate is formed on the top center of the lower plate and places an I-shaped steel(100) on the top in order to touch the bottom of a lower flange(130). The cross-shaped anchor plate support plate comprises a vertical plate(351) and a horizontal plate(352) to be arranged in both sides of the intermediate reinforcement plate. The anchor plate is supported in the front side of the cross-shaped anchor plate support plate, the lower flange, and the inner intermediate reinforcement plate; is installed in the top of the lower plate; and settles after a tendon(220) is tense.

Description

 END SUPPORT APPARATUS USING CROSS- SHAPED TENDON ANCHORAGE PLATE, PRESTRESSED CONCRETE BEAM, AND CONSTRUCTION METHOD USING THE SAME}

The present invention relates to a prestressed rigid composite beam and a construction method provided with an end support using a cruciform fixing plate support plate. More specifically, an end support using a cross-shaped fixing plate support plate, in which the entire area of the lower flange concrete cross section formed in the prestressed rigid composite beam (RPF beam) is uniformly behaved, a prestressed rigid composite beam and prestressed rigid composite having the same The beam construction method.

The conventional RPF beam 10 (prestressed steel composite beam) casts and cures the lower flange concrete 12 in a state in which a preflection load is applied to the primary prestress (type I steel 11), and then removes the preflection load. In the state where the compressive stress or compressive prestress introduced into the lower flange concrete 12 is introduced by the elastic restoring force of the I-type steel, the secondary prestress is formed by using the tension member (13, non-bonded PC strand). 12, also known as casing concrete).

In particular, in the introduction of the second prestress, before placing the lower flange concrete 12, as shown in FIG. 1A, a plurality of tension members 13 are disposed in advance around the lower flange of the I-type steel 11 formed in the lower flange concrete. After dispersing and placing concrete for lower flange concrete, curing and removing the pre-flection load (release), a plurality of tension members disposed in the lower flange concrete while the primary prestress is introduced to the lower flange concrete (13). ) And by tensioning the lower flange concrete end to introduce additional secondary prestress with full prestressing design.

While maintaining the low mold height secured by the conventional preflex steel composite beam (PF beam), it is possible to secure enough economic efficiency, and the tensile stress does not occur in the lower flange concrete, thereby causing tensile cracking and excessive deflection of the lower flange concrete. There is a high structural safety, such as not to reduce fatigue strength and the like.

Both ends of the lower flange concrete 12 in the RPF beam 10 are fixed to the ends of the lower flange 11a of the RPF beam 10 as shown in FIG. 1B so that the entire area of the lower flange concrete cross section is uniformly behaved and compressed. The inner support plate 23, the outer support plate 24 and the upper support plate 25 consisting of a plate 21 and the lower support plate 22, the upper inner support partition wall and the lower inner support partition wall, the inner support plate ( 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 configured in a box shape, and thus it is uneconomical as the end of the RPF beam is over-reinforced. 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.

A new end support 30 developed to solve this problem is shown in FIG. 1C.

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 having a plurality of non-bonded PC strand penetrating holes therethrough.

An open type reinforcing member 35 (reinforcing bar) is further formed inside the lower flange concrete 12 to increase the adhesion between the end support and the lower flange concrete while resisting local stress of the beam end portion on the lower flange concrete. It can be said to be an end support having a structure.

At this time, the end support 30 having the open structure is unstable to support the fixing plate of the tension member, that is, the left and right outer side of the fixing plate 34 is relatively relatively because the compressive stress is directly transmitted to the lower flange concrete 12, not the fixing plate. There was a problem that the low strength of the lower flange concrete may be damaged and workability may be somewhat reduced due to the attachment reinforcing material (35, reinforcing bar) manufactured and installed in the field.

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

That is, especially in the I-type steel 11 of the RPF beam 10, the steel that can support the fixing plate 41 on the lower flange (11a) using a wide plate (about 60 ~ 80cm) 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, a component member for supporting the fixing plate is installed at the end of the type I steel where the use of the I type steel is not necessary. As the width of the steel increases as the width of the lower flange of the steel is increased, the value of the steel increases significantly, resulting in a problem of being uneconomical in producing an 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.

Introduced here is the end support according to FIG.

The end support member according to FIG. 1E includes a lower plate 31 formed by contacting an upper surface of a lower flange concrete lower surface; An internal intermediate reinforcing plate 32 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 34 having a plurality of through holes formed therein; Fixing plate support plate 35 which is disposed in the lower flange concrete in the longitudinal direction; including,

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 Is coincided with the height of the fixing plate support plate to allow the reinforcing bars in the longitudinal direction to pass through the left and right sides and the upper surface,

The fixing plate support plate is formed on the upper surface of the lower plate to match the height of the fixing plate inside the width of the fixing plate, in the longitudinal direction extends more than the lower plate in the direction of the center portion of the I-type steel is embedded in the lower flange concrete, the length of the lower plate The portion that is embedded in the lower flange concrete is passed through the upper and lower edges to form a communication hole.

Thus, in manufacturing the end support of the prestressed rigid composite beam, it can be seen that the fixing plate support plate can be installed directly on the lower plate, using an I-type steel consisting of a lower flange narrower than the center portion at the end, Directly fixing plate support plate is to be installed to extend in the longitudinal direction.

The lower plate is made to have the same width as the lower surface of the lower flange concrete, wherein the lower plate is made to be the same as the entire width of the lower flange concrete to install more fixing plate support plate, to install more tension in the prestressed rigid composite beam It is made possible.

In addition, since the fixing plate supporting plate is installed on the lower plate lower than the lower flange of the I-type steel, the height of its formation is increased, and the resistance vertical section is increased to effectively resist the local horizontal force caused by the PC strand. It is to maximize the advantages of prestressed steel composite beam by reducing the steel consumption to effectively optimize the cross-sectional size of I-type steel.

At this time, the height of the fixing plate support plate is the same as the height of the fixing plate, that is, formed over the entire height except the thickness portion required for construction, including the thickness of the lower plate at the overall height of the lower flange concrete and the coating thickness on the upper surface of the lower flange concrete. By securing a more effective supporting force when supporting the fixing plate, it is possible to disperse and arrange as many tension materials as possible from the lower flange to the upper to maximize the advantages of the prestressed rigid composite beam.

In addition, 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, and the extended portion embedded in the lower flange concrete beyond the lower plate length is treated This facilitates the flow of stress and allows the stirrup reinforcement to be installed in the lower flange concrete at the central part rather than the end of the beam through the lower plate so that it can be continuously added.

However, the end support according to FIG. 1E also has a function to compress the entire area of the lower flange concrete cross-section in the RPF beam uniformly and compresses the bottom plate contact with the bottom plate on the lower plate. There was a problem that quality control is difficult and somewhat unstable in supporting the fixing plate because it is placed and placed by the fixing plate support plate.

Accordingly, the present invention can be easily installed while having the function of compressing the entire area of the lower flange concrete cross section in the RPF beam uniformly, and can effectively support the fixing plate, while also between the fixing plate support plate when placing the lower flange concrete An end support using a cross-shaped fixing plate support plate, which can be easily filled in, is a technical problem to solve the provision of a prestressed steel composite beam and a prestressed steel composite beam construction method provided with the same.

In order to achieve the above object,

First, in forming a fixing plate support plate, a cross-shaped fixing plate support plate having vertical plates formed on a vertical plate is used. The cross-shaped fixing plate support plate allows the front of the vertical plate and the horizontal plate to support the fixing plate more effectively while contacting the rear surface of the fixing plate.

Secondly, the cross-type fixing plate support plate is integrally prepared in advance and installed on both sides of the I-type steel. The horizontal plate can reduce the number of conventional fixing plate support plate installations, thereby simplifying the installation work.

Third, the cruciform support plate is spaced upward from the lower plate to be supported on the fixing plate, so that the lower flange concrete (casing concrete) can be easily charged, so that the lower concrete filling hole may not be formed in the cruciform fixing plate support plate. The processing cost can be reduced.

To this end,

Lower plate: the inner middle reinforcing plate formed in the center of the upper surface of the lower plate; A cruciform fixing plate support plate including a vertical plate and a horizontal plate disposed at both sides of the inner middle reinforcing plate; And a fixing plate which is supported on the front of the cross-shaped fixing plate support plate and the lower flange front of the I-type steel and the front of the inner middle reinforcement plate and installed on the upper surface of the lower plate, and the tension member is fixed after tension. Provided is an end support using a cross-type fixing plate support plate for placing an I-type steel to be in contact with a bottom surface of a lower flange, and a method of constructing a prestressed steel composite beam and a prestressed steel composite beam having the same.

The end support body according to the present invention is not only easy to manufacture and install, but also effective for supporting the fixing plate, and also easy to fill the lower flange concrete, so that more efficient and economical RPF beam production is possible.

In other words, by using the cross-type fixing plate support plate, the number of installation of the conventional fixing plate support plate is reduced, and workability and workability are greatly improved, and stress concentrated at both ends of the lower flange concrete can also be dispersed in the horizontal direction. This makes it possible to distribute.

In addition, the cross-fixing plate support plate may be spaced apart from the lower plate so that the lower flange concrete may be filled between the lower plate and the bottom of the cross-fixing plate support plate, thereby enabling lower flange concrete filling without forming a hole in the cross-fixing plate support plate.

1A is a cross-sectional view of a conventional RPF beam (re-prestress pre-flex composite beam);
Figure 1b is an end support installation perspective view installed at the end of the conventional RPF beam,
Figure 1c is a perspective view of the end support installation of the open structure installed at the end of the conventional RPF beam,
Figure 1d is a perspective view of the configuration of the end support is installed on the end of the RPF beam using a conventional steel bracket,
1E is a perspective view of another end support configuration of a conventional open structure;
Figure 2a and Figure 2b is an assembling configuration and assembling perspective view of the end support is installed on the end of the RPF beam using the cross-fixing plate support plate of the present invention,
3 is a contrast diagram of an end support and a conventional end support provided at the end of the RPF beam using the cross-fixing plate support plate of the present invention,
4A, 4B and 4C are manufacturing flowcharts of the end support provided at the end of the RPF beam using the cross-fixing plate support plate of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise.

[End Support 300 of the present invention]

2A and 2B illustrate a configuration and assembly perspective view in which the end support 300 of the present invention is installed in the I-type steel 100.

The end support 300 of the present invention is installed at both ends of the RPF beam (prestressed composite beam), as shown in Figure 2a, of the I-type steel (100) constituting the RPF beam (prestressed composite beam) First, the lower plate 310 is prepared to support the end of the bridge bearing.

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

2b has the same width as the lower surface of the lower flange concrete 200 constituting the RPF beam (prestressed steel composite beam) and is installed to extend in the longitudinal direction with a predetermined length, usually manufactured by processing steel sheet Done.

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, can also be produced by welding 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 in order to make the central part rigidity of the I-type steel larger than the end stiffness based on the longitudinal direction Therefore, the width of the central steel is greater 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 preferable to use I-type steel formed of upper and lower flanges narrower than the width.

At this time, as shown in Figure 2b around the lower flange 130 of the I-type steel 100 to install a separate casing formwork (not shown) to form the lower flange concrete 200, the concrete is poured into the inside, curing It is possible 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 reinforcing plate 320, the outer inner plate (2, 321) is shorter than the middle plate (1, 322) when connected to the fixing plate 340 of the inner inner middle reinforcing plate ( 322 is in contact with the fixing plate 340 to partially resist the horizontal force, and the inner inner stiffening plate 321 of the outer space between the fixing plate 340 is partially spaced, the concrete for the lower flange concrete smoothly into the free space Allows to be poured and filled.

Typically, since the lower flange concrete 200 has a plurality of tension members 220 disposed in the longitudinal direction, the horizontal secondary compression prestress (local horizontal force) introduced by the tension members 220 reaches several hundred tons.

In order to effectively resist such horizontal compressive prestress, a fixing plate support plate is provided.

The fixing plate support plate is characterized by using a cross-shaped fixing plate support plate 350 configured to include a vertical plate 351 and a horizontal plate 352.

First, the vertical plate 351 is to be in contact with the back surface of the fixing plate 340 and to support the stress acting in the vertical direction.

The horizontal plate 352 is formed on the vertical plate 351 horizontally spaced apart from each other to support the stress acting in the horizontal direction.

That is, the cross-type fixing plate support plate 350 including the vertical plate and the horizontal plate serves to resist and distribute stress generated at both ends of the RPF beam (prestressed composite beam) in the vertical and horizontal directions. As described above, the number of installations can be reduced in comparison with the case where only the fixing plate supporting plate of the vertical plate type is installed.

1e, but two fixing plate support plates are installed on both sides of the I-type steel 100, but the present invention can be seen that the cross-type fixing plate support plate 350 can be installed one by one.

The cross-shaped fixing plate support plate 350 is arranged to be spaced apart slightly upwards without contacting the bottom surface on the upper surface of the lower plate 310 so that the concrete for lower flange concrete can be smoothly poured and filled in the space formed by the spaced apart space. To be able to.

This arrangement may be arranged using a method of installing a spacer (not shown) between the lower plate 310 and the cross-shaped fixing plate support plate 350.

The cross-shaped fixing plate support plate 350 is installed to extend in the longitudinal direction of the I-type steel (100).

The cruciform fixing plate support plate 350 may be installed to have a predetermined length from the end of the prestressed rigid composite beam, but in particular, the extension length L1 of the cruciform fixing plate support plate 350 may be extended to the lower plate 310. L2) extends further in the longitudinal direction to more effectively resist horizontal compressive prestress (local horizontal force).

In addition, the cross-shaped fixing plate support plate 350 is positioned inward from the vertical edges of both sides of the fixing plate 340, so that defects such as cracking and dropping due to insufficient thickness of concrete on the left and right sides of the lower flange concrete in advance are prevented. The upper surface of the cross-shaped fixing plate support plate 350 is made to have the same height as the upper surface of the fixing plate to increase the resistance area as much as possible, thereby increasing the resistance efficiency against local horizontal force.

On the other hand, by placing the reinforcing bar 210 to the outside of the fixing plate to further solidify the coupling between the end support 300 and the lower flange concrete 200 to prevent the defects (cracking, peeling, falling off) of the concrete, the local horizontal force Make some resistance possible.

As shown in FIG. 2B, the fixing plate 340 is installed so that the bottom surface is in contact with the lower plate 310 so as to share some horizontal force on the lower plate, and a part of the abdomen and the lower flange of the I-type steel, the middle plate of the internal middle reinforcing plate, and the fixing plate support plate. It setstles in contact with and shares a horizontal force.

At this time, the left and right sides of the fixing plate 340 is further extended to the outside of the cross-shaped fixing plate support plate 350, smaller than the width of the lower plate 310 having the same size as the width of the lower flange concrete 200, the lower flange concrete on the left and right In order to prevent a defect such as cracking and falling off at 200, the concrete to ensure a sufficient adhesion thickness,

The upper surface of the fixing plate 340 coincides with the upper surface of the cross-shaped fixing plate support plate 350 to make the fixing area larger but smaller than the height of the lower flange concrete, such as cracks caused by the difference in relative stiffness between the fixing plate and the concrete. To prevent defects in advance, and the reinforcing bar 210 of the reinforcing bar reinforcing the end so that the longitudinal reinforcement can be extended to the rear side in addition to the front side of the fixing plate to which the horizontal compressive force by the PC strand is introduced, so To improve the binding effect with the finish.

Accordingly, the fixing plate 340 has a plurality of through-holes 341 through which the tension member can pass.

The lower plate 310, the inner middle reinforcing plate 320, the cross-shaped fixing plate support plate 350, the upper vertical plate 330, some of the tension material 220, the non-bonded PC strand wire to the lower flange concrete 200 as shown in Figure 2b And a reinforcing bar 210 is embedded and installed, 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.

[Contrast between the present invention and the conventional end support]

3A and 3B show a cross-sectional view of an RPF beam (prestressed composite beam) provided with the end support according to FIG. 1E and a cross-sectional view of an RPF beam (prestressed composite beam) provided with the end support according to the present invention.

According to Figure 3a the lower plate 31 formed in contact with the upper surface of the lower flange concrete lower surface; An internal intermediate reinforcing plate 32 formed between an upper surface of the lower plate and a lower flange of the I-type steel; An upper vertical plate 33 formed between the lower flange and the upper flange of the I-type steel; A fixing plate 34 having a plurality of through holes formed therein; It is composed of a fixing plate support plate 35 disposed in the lower flange concrete in the longitudinal direction, the tension member 22 is disposed between the fixing plate support plate 35 in the longitudinal direction inside the lower flange concrete 20 It can be seen.

Accordingly, when placing concrete for lower flange concrete, there is a problem in that it is difficult to fill by separately placing by the fixing plate support plate 35.

In addition, two fixing plate support plates 35 are provided on both sides of the I-type steel 100 so as to be effective against the load acting in the vertical direction, but unlike the load acting in the horizontal direction, the fixing plate support plate 35 has a resistance capacity. Will fall.

Accordingly, in the case of the present invention according to FIG. 3B, the cross-type fixing plate support plate 350 is not only installed one by one on both sides of the I-type steel 100 but also resists loads acting in the horizontal direction by the horizontal plate 352. It can be seen that the ability to secure.

In addition, since the cross-shaped fixing plate support plate 350 is formed with a space between the lower plate 310, when the concrete for lower flange concrete is poured, it is not divided by the cross-type fixing plate support plate 350 and filled (indicated by arrows). It can be seen that it becomes efficient.

In addition, it can be seen that the tension member 220 also has a difference in the number of installations compared with FIG.

As a result, the cross-fixing plate support plate 350 can reduce the number of installations, but also facilitates the filling of the concrete for the lower flange concrete, which is very advantageous for workability and construction.

[Production of RPF Beam with End Support of the Present Invention]

4A, 4B and 4C show a manufacturing flowchart of the RPF beam having an end support according to the present invention.

First, as shown in FIG. 4A, the I-type steel 100 is separately prepared and a lower plate 310 is disposed below the I-type steel 100 through an internal intermediate reinforcing plate 320 in an open form.

Thus, it can be seen that the inner middle reinforcing plate 320 is fixed to the lower plate 310 by welding, and the bottom surface of the lower flange of the I-type steel 100 is fixed to the upper surface of the inner middle reinforcing plate 320 by welding. .

Next, as shown in FIG. 4B, one cross-type fixing plate support plate 350 is installed on both sides of the I-type steel 100, for example, one by one, and is spaced slightly apart from the lower plate 310. This may be arranged to be spaced upward using a spacer or the like.

The tension member 220 is disposed between the cross-shaped fixing plate support plate 350 and extends in the longitudinal direction, and both ends thereof protrude into the through holes formed in the fixing plate 340, and the fixing plate 340 is lower plate 310. The upper surface is also fixed by welding.

At this time, the front of the cross-shaped fixing plate support plate 350 is in contact with the rear surface of the fixing plate 340 to be fixed by welding with each other.

Next, as shown in FIG. 4c, the reinforcing bar 210 is disposed and the lower flange concrete 200 is formed by using a formwork not shown.

Of course, by placing the concrete concrete for the RPF beam to surround the exposed abdomen and the lower flange of the I-type steel 100 to complete the final RPF beam fabrication.

Next, the tension member 220 penetrated by the fixing plate 340 is fixed to the fixing plate after the tension so that prestress is introduced into the lower flange concrete 200.

[Prestressed rigid beam construction method having an end support using a cruciform fixation plate support plate of the present invention]

Although the construction method is not shown, the bridge substructure including the bridges and shifts is first constructed.

In this way, the bridge lower structure is installed in such a way that the prestressed rigid composite beam having an end support using the cross-shaped fixing plate support plate as described above in the longitudinal direction is loaded and mounted on the site.

At this time, the prestressed steel composite beam will be installed in short diameter steel and multi span, and it will be installed using bridge bearing.

Next, the slab formwork is used to construct the bridge slab so that the final bridge construction can be completed.

The foregoing description of the present invention is intended for illustration, and it will be understood by those skilled in the art that the present invention may be easily modified in other specific forms without changing the technical spirit or essential features of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is shown by the following claims rather than the above description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

100: type I steel
110: upper flange 120: abdomen
130: lower flange
200: lower flange concrete
210: reinforcing bar 220: tension material
300: end support
310: bottom plate
320: internal intermediate reinforcing plate
330: upper vertical plate
340: fixing plate 350: cross-shaped fixing plate support plate

Claims (5)

Bottom plate 310:
An internal intermediate reinforcing plate 320 formed at the center of the upper surface of the lower plate;
A cross-type fixing plate support plate 350 including a vertical plate 351 and a horizontal plate 352 disposed on both sides of the internal middle reinforcing plate; And
A fixing plate that is supported on the front of the cross-shaped fixing plate support plate 350 and the front of the lower flange of the I-type steel and the front of the inner middle reinforcing plate 320 is installed on the upper surface of the lower plate 310 and the tension member 220 is fixed after the tension ( 340); End support body using a cross-shaped fixing plate support plate, characterized in that the I-shaped steel 100 is arranged to contact the bottom surface of the lower flange 130 on the upper surface of the inner middle reinforcement plate (320). The method of claim 1, wherein
The cross fixing plate support plate 350 is spaced upwardly from the lower plate 310 so that the concrete for lower flange concrete can be poured and filled smoothly in the space formed by being spaced apart, and the cross fixing plate supporting plate ( The upper surface of the 350 is an end support using a cross-shaped fixing plate support plate characterized in that it is formed at the same height as the upper surface of the fixing plate (340). 3. The method according to claim 1 or 2,
The extension length (L2) of the cross-shaped fixing support plate is an end support using a cross-shaped fixing plate support plate, characterized in that formed to extend further in the longitudinal direction of the I-type steel than the extension length (L1) of the lower plate. Lower plate 310: the internal middle reinforcing plate 320 formed on the upper surface of the lower plate; It includes a vertical plate and a horizontal plate disposed in both sides of the inner intermediate reinforcement plate to be spaced upwardly from the lower plate 310 so that the lower flange concrete concrete is placed in the space is formed spaced apart and Cross-shaped fixing plate support plate 350 is installed so as to be filled; And a fixing plate 340 which is supported on the front of the cross-shaped fixing plate support plate and the lower flange front of the I-type steel and the front of the inner middle reinforcement plate and installed on the upper surface of the lower plate, and the tension member is fixed after tension. ;
An I-type steel 100 formed to contact a lower flange bottom surface on an upper surface of the inner middle reinforcing plate;
A lower flange concrete 200 formed so as to embed reinforcing bars formed to surround the end support therein; And
Prestressed rigid composite beam having an end support using a cross-shaped fixing plate support plate, characterized in that it comprises; the tension member 220 is disposed to penetrate the fixing plate to be fixed to the fixing plate after the tension. Prepare the prestressed steel composite beam of claim 4,
The prestressed rigid composite beam is installed in the bridge substructure,
A prestressed composite beam construction method comprising an end support using a cross-shaped fixing plate support plate comprising the step of constructing a slab on the prestressed rigid composite beam.

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