KR101585482B1 - Composite girder with reinforced end unit of anti-crack and the manufacturing method thereof - Google Patents

Composite girder with reinforced end unit of anti-crack and the manufacturing method thereof Download PDF

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Publication number
KR101585482B1
KR101585482B1 KR1020150129588A KR20150129588A KR101585482B1 KR 101585482 B1 KR101585482 B1 KR 101585482B1 KR 1020150129588 A KR1020150129588 A KR 1020150129588A KR 20150129588 A KR20150129588 A KR 20150129588A KR 101585482 B1 KR101585482 B1 KR 101585482B1
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South Korea
Prior art keywords
girder
steel beam
steel
flange
end block
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KR1020150129588A
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Korean (ko)
Inventor
유근한
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주식회사 노빌테크
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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
    • E01D2/02—Bridges characterised by the cross-section of their bearing spanning structure of the I-girder type
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2101/00—Material constitution of bridges
    • E01D2101/20—Concrete, stone or stone-like material
    • E01D2101/24—Concrete
    • E01D2101/26—Concrete reinforced
    • E01D2101/28—Concrete reinforced prestressed
    • E01D2101/285—Composite prestressed concrete-metal

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Bridges Or Land Bridges (AREA)
  • Rod-Shaped Construction Members (AREA)

Abstract

The present invention relates to a composite girder with an anti-crack type reinforced end unit for a bridge, and a manufacturing method thereof. The composite girder comprises a girder end unit block and a girder center block which have different sectional shapes from each other. The girder center block comprises a steel beam and a casing concrete unit installed in a lower end unit of the steel beam, and an upper unit of the steel beam is exposed. The girder end unit block has a reinforced concrete structure without the steel beam, has a height in which an upper surface is positioned between a casing concrete unit of the girder center block and both upper surfaces of the steel beam, and makes shear reinforcements protrude upward.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a composite girder having an end-

The present invention relates to a method of manufacturing a bridge girder, and more particularly, to a composite girder manufactured by casting a casing concrete under a steel beam and introducing a prestress thereto.

When a girder is manufactured by using a steel beam such as an I-shaped steel, casing concrete is installed in the lower flange portion as shown in FIG. 1 to increase the sectional force And a steel wire is inserted into the casing concrete together with the steel wire, thereby tightening the steel wire, thereby reducing the size of the steel beam

However, since the casing concrete installed in the synthetic girder as shown in FIG. 1 has a relatively small sectional size, it is not easy to tie the steel wire, cracks are generated due to the concentrated load, There is a problem.

In order to solve these problems, the invention of a method of manufacturing a PS girder using a fixed fixing device of Registered Patent Publication No. 10-1460595 filed on Apr. 11, 2014 has been limited.

As shown in FIG. 2, in the method of manufacturing the girder according to the above-mentioned Japanese Patent Application No. 10-1460595, the steel wires 40 installed in the casing concrete 70 are divided into a plurality of steel wire groups having different lengths (a) the steel wires of a plurality of the steel wire groups are arranged alternately in at least one direction along the width direction of the thread girder (3) so that the positions of the ends to be fixed by the movable hot fixture (20) Fixing the ends of the steel wires located inside the pisse girder with the fixing fixture 30; (b) a step of pulling an end of the steel wires opposite to the fixed fixing port so as to fix the end of the steel girder to the movable fixing unit at an end of the pace girder, wherein the arrangement of the fixed fixing holes in the step (a) And the number of distribution of the steel wires is gradually reduced over three or more intervals in the direction of both ends from the center of the girder, and the steel wire group has a first length And at least a pair of second steel wire groups each having a second length shorter than the first steel wire, wherein the fixing fixing hole has a first fixing portion for fixing the first wire group And a second fixed fixing port used for fixing the second steel wire group, wherein the first fixed fixing port has a length of 0.13L to 0.17L of the length of the pce girder (L) Is installed in the second fixed anchorage is characterized in that provided in the 0.23L ~ .27L position of the PS girder length (L).

The above-described conventional technique for separating the steel wires provided inside the casing concrete and separating the fixing ports between the inside and outside of the casing concrete enables an effect of dispersing the concentrated load on the casing concrete end. However, since the steel wire groups distributed in the casing having a small cross-sectional area are required to have complicated arrangements together with the reinforcing bars, not only the workability is very low, but also the problem that the parabola is difficult to be efficiently arranged to the steel wire still remains have.

KR 10-1460595 B1

It is an object of the present invention to solve the problems of the prior art described above and to provide an apparatus and a method for preventing cracking at a fixing end due to a concentrated load without reducing the amount of steel used, The present invention provides an economical synthetic girder with improved workability and a method for easily manufacturing the same.

According to a preferred embodiment of the present invention, the composite girder is composed of a girder end block and a girder center block having different cross-sectional shapes, and the girder center block includes a steel beam and a plurality of The upper end of the steel beam is exposed and the girder end block is made of a reinforced concrete structure in which a steel beam is excluded and the upper surface of the girder end block is positioned between the casing concrete portion of the girder center block and each upper surface of the steel beam And a shear reinforcement protruding to the upper portion of the girder.

According to another embodiment of the present invention, there is provided a method comprising: placing a steel beam on a bed so as to be spaced apart from a top surface of the bed by a predetermined height; Installing reinforcing bars and sheath pipes on both sides of the steel beam and on the lower side of the steel beam; Forming a mold, placing and curing concrete to form a girder end block on both end portions of the steel beam and a casing concrete portion under the steel beam; And inserting a steel wire into the sheath pipe and introducing a prestress into the composite girder through a prestressing operation.

According to another embodiment of the present invention, there is provided a method of manufacturing a bed, comprising the steps of: placing prebuilt girder end blocks on opposite ends of a bed, Placing a steel beam so as to be positioned between the girder end blocks while allowing the steel beam to be spaced apart from the upper surface of the bed by a predetermined height; Connecting a reinforcing bar and a sheath pipe to a lower portion of the steel beam and connecting the reinforcing bar and the sheath pipe to a reinforcing bar and a sheath pipe installed in the girder end block, respectively; Forming a casing and casting the concrete to form a casing concrete part under the steel beam integrated with the girder end block; And inserting a steel wire into the sheath pipe and introducing a prestress into the composite girder through a prestressing operation.

The steel girder is disposed only at the center portion where the bending moment largely acts and the upper portion of the steel beam is exposed by changing the section of the end portion and the central portion of the synthetic girder so that the steel material is efficiently used, Allowing the beam to be built.

In addition, since the girder end block having a section is extended at both ends of the casing concrete portion, the present invention facilitates tensioning of the steel wire embedded in the casing concrete portion despite the small cross section of the casing concrete portion, Which can be arranged in a parabolic shape as well as a straight shape, and it is possible to minimize the occurrence of cracks at the ends of the composite girder such as the fixing end, thereby improving the durability and having a clean appearance It is possible to establish a high-quality composite girder.

Since the steel beam for the composite girder is transported in three segments and welded by welding in the field, the present invention can use a steel beam that is not segmented because only the central portion of the synthetic girder is used, And to reduce the incentive effect.

1 is a cross-sectional view of a composite girder according to the prior art.
2 is a plan view and a cross-sectional view of another prior art that improves the composite girder of FIG.
3 is a perspective view and a cross-sectional view of a composite girder manufactured by the present invention.
4 and 5 are perspective views showing an example in which the steel beam end portion of the present invention is tapered in a beveled shape.
6 and 7 are a perspective view and a cross-sectional view of each embodiment of the girder end block of the present invention.
8 to 10 are conceptual diagrams showing the process of manufacturing the composite girder of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, in order to obscure or obscure the technical idea of the present invention due to the detailed description of the known structure in describing the present invention, the description of the structure of the above known structure will be omitted.

Fig. 3 shows a composite girder fabricated by an embodiment of the present invention, wherein (a) is a perspective view and (b) is a cross-sectional view for explaining its interior

The composite girder fabricated by the present invention is divided into a girder end block 100 and a girder center block 200. As shown in Fig. 3 (b), each of these composite girders has a cross- Different from each other.

The girder center block 200 includes a steel beam 210 which is exposed at an upper portion thereof so as to reduce the amount of material used while sufficiently resisting the bending moment generated at the center of the composite girder and a casing concrete portion 220). The steel beam 210 is preferably an I-beam or H-beam, but a box-shaped beam of steel may also be used.

On the other hand, the girder end block 100 is made of a reinforced concrete structure in which the steel beam 210 is excluded. Therefore, a stress concentration phenomenon may occur due to a change in cross section at the end portion of the steel beam 210 of the synthetic girder, that is, the portion where the girder end block 100 and the girder center block 200 are connected.

Means for preventing such stress concentration phenomenon from occurring and for facilitating transmission of stress may be further provided at both ends of the steel beam 210.

Figs. 4 and 5 show examples of such stress concentration preventing means.

As a means for preventing the stress concentration that may occur on the connecting portion between the girder end block 100 and the girder center block 200, a lower part of both ends of the steel beam 210 is formed as a beveled shape As shown in Fig.

At this time, when the steel beam 210 is an I-shaped steel or an H-shaped steel, it is preferable to provide the inclined flange 214 at the end of the tapered portion so as to be connected to the lower flange 212, .

In addition, when the upper plate concrete (not shown) is placed on the upper part of the composite girder, a sharp change in the member and the section between the girder end block 100 and the girder center block 200, which are embedded in the upper plate concrete, The upper portion of the end of the steel beam 210 to be embedded in the upper plate concrete may be tapered so as to correspond to the lower portion as shown in FIG.

The steel beam 210 may further include a vertical flange 215 connecting between the inclined flange 214 provided at the lower portion and the inclined flange 214 provided at the upper and lower portions between the upper flange 211 and the lower flange 214, The vertical flange 215 may further include a through hole 216 through which the concrete may flow. The vertical flange 215 and the through hole 216 may be formed in a manner such that, Thereby exerting an effect of further increasing the composite force of the steel beam 210.

The girder end block 100 is formed of a reinforced concrete structure in which the steel beam 210 is excluded as described above. This allows the girder end block 100 to have continuity with the casing concrete portion 220 provided in the girder center block 200, So that the steel wire 224 can be disposed in a parabolic shape so as to have a high eccentricity efficiency.

In addition, it secures a sufficient size cross-section for the fixing end, thereby preventing the occurrence of cracks which deteriorate the appearance and even corrode the reinforcing bars to lower the durability.

The dancing h and the length l1 of the girder end block 100 may vary depending on the size of the prestress to be introduced through the steel wire 224 installed in the casing concrete portion 220 Of the composite girder length (ℓ), while the upper surface is danced at a height located between the casing concrete portion (220) of the girder central block (200) and each upper surface of the steel beam (210) 3, but preferably has a length corresponding to 1/4.

When the length of the girder end block 100 is less than 1/6 of the length of the composite girder l, the cross-sectional size of the girder end block 100 becomes insufficient for suppressing the cracks generated at the fixing end due to the introduction of the prestress, The size of the synthetic girder self-weight increases the size of the member such as the steel beam 210 unnecessarily.

The upper end of the girder end block 100 is further provided with a shear reinforcement 111 projecting upward. The shear reinforcement 111 is embedded in the upper plate concrete placed on the upper portion of the composite girder, thereby making a strong synthesis effect between the girder and the upper plate concrete, thereby achieving a structurally integrated behavior.

The girder end block 100 having such a structure and a cross section is manufactured together with the girder center block 200 in a manner that concrete is laid simultaneously with the placement of the casing concrete part 220 constituting the girder center block 200 However, the girder center block 200 may be separated from the girder center block 200 and may be manufactured in advance at a place other than the factory site.

The girder end block 100, which is manufactured separately from the girder center block 200, is provided with means for connection with the girder center block 200.

6 and 7 illustrate embodiments of the girder end block 100 having the means for connecting with the girder center block 200, which are separately manufactured as described above.

According to the first embodiment of the girder end block 100 which is manufactured separately, the connecting bracket 120 is provided on one side of the girder end block 100 as shown in FIG. The connecting bracket 120 should have a cross-sectional shape that can be strongly coupled with the steel beam 210 of the girder center block 200. For example, when the steel beam 210 is an I-beam steel, And preferably has a T-shaped cross-section so as to correspond at least to the upper flange 211 of the steel beam 210 and the web 213.

According to the second embodiment of the girder end block 100, as shown in FIG. 7, a mounting groove 130 formed inside is formed on one side of the girder end block 100.

The fixing groove 130 has a main function in that the steel beam 210 is hardly coupled to the girder end block 100 by filling the concrete while the end of the steel beam 210 is mounted, Since the end of the steel beam 210 is simply fixed to the groove 130, the steel beam 210 can be positioned at an accurate level, and there is no need for a separate bolting operation, so that precision and workability are further increased So that other effects can be expected.

When the steel beam 210 is connected to the girder end block 100 according to the second embodiment, the steel beam 210 is not shown in the drawing, but the composite force with the girder end block 100 is increased A shear connection member can be further provided.

The girder end block 100 of each of the above embodiments is provided with connecting means for connecting with the steel beam 210 such as the connecting bracket 120 or the mounting groove 130 as well as reinforcing bars and sheaths embedded in the casing concrete portion 220. [ Means for maintaining continuity to the tube 223a are further provided.

For example, a reinforcing bar 112 and a sheath pipe 223b may be provided so as to protrude from the girder end block 100, or a nut (not shown) may be previously embedded so that a joint using a screw fastening method can be used.

On the other hand, the connection portion between the girder end block 100 and the casing concrete portion 220 has an oblique upper surface, which prevents the concentration of stress on the connection portion as described above, and the arrangement of the parabola of the steel wire 224 . When the lower end of the steel beam 210 is configured to be tapered, it is preferable that the tapered portion is located at the connection portion, and the tapered inclination angle is configured to coincide with the upper surface inclination angle of the connection portion.

As described above, the composite girder according to the present invention can be manufactured integrally in the field, and the girder end block 100 is separated from the girder central block 200 and manufactured in advance at a place other than the factory site, So as to be connected to the girder central block 200 in the field.

Figs. 8 to 10 illustrate each embodiment of the method for manufacturing such a composite girder with reference to drawings.

As shown in Fig. 8, the composite girder according to the first embodiment of the present invention includes a step of mounting the steel beam 210 on the bed 300, a step of placing the outer side of both ends of the steel beam 210 A step of installing a reinforcing bar and a sheath pipe 223 at a lower portion of the steel beam 210, a step of pouring concrete, and a step of introducing a prestress are sequentially performed.

More specifically,

I) First, the steel beam 210 is mounted on the bed 300 so as to be spaced apart from the upper surface of the bed 300 by a predetermined height. The spacing height depends on the size of the casing concrete part 220 placed under the steel beam 210. To this end, the spacers 311 are pre-installed on the bed 300 or hanger So that the steel beam 210 can be suspended. Of course, when the steel beam 210 is mounted on the bed 300 as described above, a space for the girder end block 100 must be secured at both ends thereof.

Meanwhile, a part of the reinforcement for the casing concrete part 220 is installed in advance below the steel beam 210 before the steel beam 210 is mounted on the bed 300, can do.

The girder end block 100 positioned at both end portions of the steel beam 210 and the reinforcing bars 220 for the casing concrete portion 220 installed at the lower portion of the steel beam 210, The sheath tube 223 is installed so as to introduce a prestress by inserting the steel wire 224 in the future.

A portion of the reinforcing bars laid down for the girder end block 100 is protruded upward so as to be embedded in the upper plate concrete placed on the upper portion of the synthetic girder so that the shear reinforcing bars 111 can be formed.

Iii) When the reinforcement and the sheath pipe 223 are completed, the formwork is installed and the concrete is laid and cured to form the casing concrete block 220 under the girder end block 100 and the steel beam 210, After the steel wire 224 is inserted into the sheath tube 223, a prestress is introduced into the synthetic girder through a prestressing operation.

When the concrete is poured, it is preferable that the connecting portion is formed in a shape of a sloped cross-section so that the stress transmission is not cut off on the connecting portion between the girder end block 100 having high dancing and the casing concrete portion 220 having low dancing .

The fabrication of the composite girder according to the second embodiment of the present invention is similar to that of the first embodiment except that the girder end block 100 is constructed in advance with the casing concrete portion 220, And connecting it to the girder center block 200 in the field.

That is, as shown in FIGS. 9 and 10, the steps of placing the girder end block 100 at both ends of the bed 300, placing the steel beam 210 between the girder end blocks 100 A step of mounting the steel beam 210 to the bed 300, a step of installing a reinforcing steel reinforcement for the casing concrete part 220 and a sheath pipe 223a, a step of pouring concrete, and a step of introducing a prestress As shown in FIG. 9 shows a process of fabricating a composite girder using the girder end block 100 of FIG. 6 having a connection bracket 120 on one side. FIG. 10 shows a process of manufacturing a composite girder having a mounting groove 130 7 shows a process of manufacturing a composite girder using the girder end block 100. The production process of the composite girder will be described in detail as follows.

I) First, the pre-fabricated girder end blocks 100 are placed on both ends of the bed 300 separately from each other. The spacing between the respective fixed girder end blocks 100 at both ends of the bed 300 corresponds to the length of the girder center block 200.

Ii) When the loading of the girder end block 100 with respect to the bed 300 is completed, the steel beam 210 is mounted between these girder end blocks 100. Of course, the stationary steel beam 210 must be spaced apart from the upper surface of the bed 300 by a predetermined height so that the casing concrete portion 220 can be formed at the lower portion thereof.

In this case, when the connecting bracket 120 is installed on the girder end block 100, the girder end block 100 and the steel beam 210 are connected to each other by using bolt joining means through a plate.

On the other hand, the steel beam 210 is mounted between the girder end blocks 100 in a state where a part of the reinforcing bars for the casing concrete part 220 is installed in the lower part thereof in the same manner as in the first embodiment described above .

Iii) When the operation for mounting the steel beam 210 is completed, a sheath tube 223a for inserting a reinforcing bar for the casing concrete part 220 and inserting the steel wire 224 is formed below the steel beam 210, . At this time, the horizontal reinforcing bars and the sheath pipes 223a installed in the longitudinal direction of the steel beam 210 are connected to the shear pipe 223b and the connecting reinforcing bars 112 provided at the girder end block 100, .

Iv) When the installation work of the reinforcing bars and the sheath pipe 223 for the steel beam 210 is completed, the form is installed and the concrete is poured into the casing concrete part 220 under the steel beam 210, When the girder end block 100 is fixed to the girder groove 130 of the girder end block 100, the girder center block 200 is constructed by concurrently placing the concrete in the girder groove 130, ) To be structurally integrated.

The casing concrete portion 220 on the connection portion with the girder end block 100 has a shape of an inclined side surface as in the first embodiment so as to prevent the stress transmission from being cut off.

V) Finally, when curing of the poured concrete is completed, the steel wire 224 is inserted into the sheath pipe 223, and then the steel wire 224 is tensed to complete the composite girder in which the prestress is introduced.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the invention is not limited to the disclosed embodiments, but, on the contrary, It is obvious that it will be possible to carry out various modifications thereof. It is therefore intended that such modifications are within the scope of the invention as set forth in the claims.

100; A girder end block 111; Shear reinforcement
112; A connecting reinforcing bar 120; Connection bracket
130; A mounting groove 200; Girder center block
210; a steel beam 211; Upper flange
212; A lower flange 213; Web
214; Inclined flange 215; Vertical flange
216; Through hole 220; Casing concrete section
223, 223a, 223b: sheath tube 224; Steel wire
300; Bed 311; Spacer

Claims (6)

In the composite girder for bridges,
The composite girder is composed of a girder end block 100 having different cross-sectional shapes and a girder center block 200,
The girder center block 200 is composed of a steel beam 210 and a casing concrete part 220 installed at a lower end thereof to expose the upper part of the steel beam 210. The steel beam is divided into an upper flange 211, The upper and lower flanges 211 and 212 are provided with inclined flanges 214 as the I-shaped steel or H-shaped steel having the flange 212 and the vertical flange 215 having the through holes 216 formed between the inclined flanges 214 And,
The girder end block 100 is made of a reinforced concrete structure in which the steel beam 210 is excluded so that the upper end of the girder end block 100 is connected to the casing concrete portion 220 of the girder center block 200 and the steel beam 210 And a shear reinforcement (111) protruding therefrom, the reinforcement composite girder having a height positioned between the upper surfaces thereof. delete delete A method of manufacturing a composite girder for a bridge,
Placing a steel beam (210) on the bed (300) so as to be spaced apart from the upper surface of the bed (300) by a predetermined height; Installing a reinforcing bar and a sheath pipe (223) on the outer sides of both ends of the steel beam (210) and under the steel beam (210); Forming a mold, placing and curing concrete to form a girder end block (100) at both ends of the steel beam (210) and a casing concrete part (220) under the steel beam (210); And introducing a prestress into the synthetic girder through a prestressing operation after inserting the steel wire 224 into the sheath pipe 223. The steel beam placed on the bed 300 is inserted into the upper flange 211 and the lower flange 211 And a vertical flange 215 having a through hole 216 formed between the inclined flanges 214 is provided on the upper and lower flanges 211 and 212 as an I- A method of manufacturing a crack-proof end-end composite girder characterized by: A method of manufacturing a composite girder for a bridge,
Placing the girder end blocks 100 provided with the mounting grooves 130 on the inner side of the one side of the bed 300 at the opposite ends of the bed 300, respectively; Placing the steel beam 210 into the mounting groove 130 so as to be positioned between the girder end blocks 100 while the steel beam 210 is spaced apart from the upper surface of the bed 300 by a predetermined height; A reinforcing bar and a sheath pipe 223a are arranged at the lower part of the steel beam 210 and the reinforcing bars and sheath pipe 223a are inserted into the reinforcing bar 112 and sheath pipe 223b provided at the girder end block 100, Connecting; Forming a casing concrete part 220 under the steel beam 210 integrated with the girder end block 100 by installing and molding concrete, and forming the casing concrete part 220 under the steel beam 210 integrated with the girder end block 100; And a step of introducing a prestress into the synthetic girder through a prestressing operation after inserting the steel wire 224 into the sheath pipe 223. The steel beam that is stowed in the mounting groove 130 is passed through the upper flange 211 and the lower flange 211, The upper flange 211 and the lower flange 211 are provided with the inclined flange 214 and the vertical flange 215 formed with the through hole 216 is provided between the inclined flanges 214 as the I- Wherein the endless reinforced composite girder is formed of a synthetic resin. 6. The method of claim 4 or 5, wherein the upper surface of the girder end block (100) is positioned between the casing concrete part (220) and the upper surface of the steel beam (210) How to make a girder.
KR1020150129588A 2015-09-14 2015-09-14 Composite girder with reinforced end unit of anti-crack and the manufacturing method thereof KR101585482B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101926301B1 (en) * 2018-04-05 2018-12-06 (주)에스앤씨산업 Steel composite Girder and Manufacturing method of girder
KR102522672B1 (en) * 2023-01-04 2023-04-18 (주)주성이앤씨 Prestressed hybrid concrete girder with different concrete strength at center part and end part and method for manufacturing the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101926301B1 (en) * 2018-04-05 2018-12-06 (주)에스앤씨산업 Steel composite Girder and Manufacturing method of girder
KR102522672B1 (en) * 2023-01-04 2023-04-18 (주)주성이앤씨 Prestressed hybrid concrete girder with different concrete strength at center part and end part and method for manufacturing the same

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