KR101515979B1 - Composite Girder with Heating-Reinforcing Steel Member and Concrete Member - Google Patents

Composite Girder with Heating-Reinforcing Steel Member and Concrete Member Download PDF

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Publication number
KR101515979B1
KR101515979B1 KR1020140132460A KR20140132460A KR101515979B1 KR 101515979 B1 KR101515979 B1 KR 101515979B1 KR 1020140132460 A KR1020140132460 A KR 1020140132460A KR 20140132460 A KR20140132460 A KR 20140132460A KR 101515979 B1 KR101515979 B1 KR 101515979B1
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South Korea
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slab
concrete
heat
steel material
concrete beam
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KR1020140132460A
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Korean (ko)
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김윤환
정원용
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주식회사 오케이건설
김윤환
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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

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Bridges Or Land Bridges (AREA)

Abstract

The present invention relates to a composite girder of heating-reinforcing steel members and a concrete beam, which has a shallow depth and prestress introducing function using heating. The composite girder has a structure where a concrete beam and steel members arranged at an interval from the top surface of the concrete beam are integrally coupled with each other to have a shallow depth, allows prestress to be introduced to an upper slab installed at the upper portion of the composite girder, and has a function of manufacturing ice to remove freezing, drifted snow, and the like by increasing the temperature of the upper slab during a winter season in order to prevent damage caused by freezing and the like. The present invention provides a steel and concrete composite girder including a concrete beam (10), and heating-reinforcing steel members (2), which are arranged at a vertical interval from the top surface of the concrete beam (1) to be integrally coupled thereto, wherein the heating-reinforcing steel members are embedded inside the concrete of the slab (4) to the integrally coupled to the slab (4) when the slab (4) is constructed on the upper part of the concrete beam (1).

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite girder with a reinforced steel material and a concrete beam having a function of introducing a prestress due to cooling shrinkage after heating and a low-

The present invention relates to a "steel-concrete composite girder" consisting of a composite of a steel member and a concrete beam, and more particularly to a concrete beam having a concrete beam, And the prestress can be introduced into the upper slab which is installed on the upper part of the synthetic girder by the heat of the steel material. Further, in the winter season, the temperature of the upper slab is increased Reinforced steel material and concrete beam girder having a function of introducing a prestress by cooling shrinkage after heating and having a low deformed structure ", which can prevent damages due to freezing by having an icing function for raising the temperature will be.

Attempts have been made to reduce the shape of the beam (or girder) that make up the bridge, as it has ensured sufficient mold space at the bottom of the bridge and intensified the span of the bridge. For reference, "deformity" of a beam in this specification should be understood to mean the vertical height from the lower surface of the slab to the lower surface of the beam when the slab is applied to the top of the beam.

For the beams of low deflection, a steel concrete synthetic girder in which a concrete beam and a steel material are integrally combined is advantageous. The conventional steel concrete synthetic girder is disclosed in Korean Patent No. 10-1125917, It has a form in which the same steel beam is used as the main member and the concrete is attached to the steel beam as an incidental member. However, in the case of such a conventional technique, since expensive steel beams are used as the main members, there is a disadvantage that the manufacturing cost is low and the economical efficiency of construction is low.

As another conventional technique of a steel concrete composite girder, there is a form of synthesizing a panel made of concrete on a lower flange of an I-shaped steel beam as disclosed in Korean Patent Registration No. 10-0536489. However, since the conventional technique also uses a steel beam as a main component, the steel beam is exposed to the outside as it is in the abdomen, and the upper flange of the I-shaped steel beam, which is coupled to the upper surface, Therefore, it is very vulnerable to corrosion.

On the other hand, in the construction of the bridge by integrally constructing the slab on the upper part of the composite concrete girder of the steel concrete, tensile stress due to the momentum is generated in the slab at the continuous point midway between the bridge bridges. It is desirable to introduce a compression prestress into the part. According to the prior art, in order to introduce a compression prestress into a slab, it is inevitable to introduce a prestress by arranging a tent in the slab. However, the introduction of a prestress by a tenter requires a large cost, It is difficult to introduce the compression prestress into the slab at the continuous focal point portion by using the tent.

Korean Registered Patent No. 10-1125917 (March 21, 2012 announcement). Korean Patent Registration No. 10-0536489 (published on December 14, 2005).

The present invention has been developed in order to overcome the disadvantages and limitations of the conventional steel concrete composite girder as described above. Specifically, the steel beam and the concrete beam are integrally combined to form a beam of low profile, By allowing the steel to function as a reinforcing member, it has low manufacturing cost and improved economical efficiency of construction, and reinforced steel is completely embedded in the concrete so that it is not exposed to the outside, thereby preventing damage such as corrosion and improving maintenance convenience. The present invention relates to a composite concrete girder having a high strength and a high strength.

In addition, the present invention can minimize the inconvenience due to icing and snowing by allowing the slab integrally formed on the upper part of the steel concrete composite girder to exhibit an icing function in the winter season, and further, The reinforcing steel material is heated and the reinforcing steel material is cooled so that the compression prestress is introduced into the slab. In order to reinforce the tensile force at the continuous point portion, And to overcome various inconveniences and limitations involved in introducing a compression prestress using the composite concrete girder.

According to an aspect of the present invention, And a lower end portion of the anchor is embedded in and fixed to the concrete beam so that the reinforcing member is inserted into the concrete beam, And a heat-strengthened steel member integrally joined with the heat-resistant steel member; Reinforced steel is embedded in the concrete of the slab and is integrated with the slab when the slab is installed on the upper part of the concrete beam.

In the steel concrete composite girder according to the present invention, the heat-strengthened steel material may be provided with a basic heat line which is heated by electric power supply; In this case, when the slab is constructed so that the heat-reinforced steel material is embedded in the concrete of the slab 4, the basic heat line may be heated to raise the temperature of the slab so that the ice-making can be performed.

Further, in the composite concrete girder of the present invention, the continuous reinforced steel material at the continuous end which is continuous with the longitudinally adjacent steel concrete composite girder may be arranged with a continuous end heating wire which is heated by electric power supply. When the composite concrete girder is continuous, the continuous end of the heat-reinforced steel is heated by the heat of the continuous end heating wire, and the concrete is placed on the concrete beam so that the heat-reinforced steel is buried in the thermally expanded state. The heating of the end portion heating wire is stopped, and the heat-reinforcing steel material is cooled and shrunk, so that the compression prestress is introduced into the slab.

Since the composite concrete girder of the present invention has a structure in which the concrete beam and the heat-reinforced steel are integrated, it has the sectional force of the heat-reinforced steel material in addition to the sectional force by the concrete beam. Therefore, The sectional force is much larger than that of a concrete beam only, and thus the effect is such that it has a very low mold height.

In the steel concrete composite girder of the present invention, the slab can be heated by arranging the basic heating line in the heat-reinforced steel material, so that the temperature of the slab can be raised during the winter season to exhibit the ice-making effect.

Further, in the case where the composite concrete girder of the present invention is continuous, the heat-reinforced steel material at the continuous point portion may further be provided with a continuous end portion heating wire. In the state where the heat-reinforced steel material is heated and expanded by the continuous end portion heating wire, Reinforced steel material is cooled and shrunk after the completion of the construction of the slab, compressive prestressing is introduced into the slab, so that it is possible to effectively cope with the tensile force due to the momentum generated at the continuous point portion.

FIG. 1 is a schematic perspective view of a composite concrete girder according to the present invention. FIG.
2 is a schematic longitudinal cross-sectional view along line AA in Fig.
FIG. 3 is a schematic perspective view showing a state where the slab is installed on the upper part of the composite concrete girder of FIG. 1. FIG.
Figure 4 is a schematic longitudinal cross-sectional view along line BB of Figure 3;
5 is a schematic perspective view showing a state in which a plurality of steel concrete composite girders according to the present invention are continuously arranged in a longitudinal direction.
Figure 6 is a schematic plan view of the state shown in Figure 5;
7 is a schematic perspective view showing a state in which a slab is integrally installed on a continuous steel concrete composite girder.
Fig. 8 is a schematic perspective view corresponding to Fig. 5 of still another embodiment of the present invention in which the transversal width of the heat-reinforced steel material is enlarged at successive focal points continuous with adjacent steel concrete composite girders.
9 is a schematic plan view of the state shown in Fig.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Although the present invention has been described with reference to the embodiments shown in the drawings, it is to be understood that the technical idea of the present invention and its essential structure and operation are not limited thereby.

FIG. 1 is a schematic perspective view of a composite concrete girder 100 according to the present invention, and FIG. 2 is a schematic vertical cross-sectional view taken along line A-A of FIG. 3 is a schematic perspective view showing a state in which a slab 4 made of cast concrete is integrally installed on the upper part of the steel concrete composite girder 100 shown in FIG. 1. FIG. 0.0 > BB < / RTI >

A composite concrete girder (100) according to the present invention comprises a concrete beam (1), a steel plate and is integrally provided on the concrete beam (1) by being spaced apart from the upper surface of the concrete beam A heating reinforcing steel material 2 and a heating coil 3 provided on the heating reinforcing steel material 2 and heating the heating reinforcing steel material 2 by electricity.

Although the concrete beam 1 is shown to have an I-shaped section having an upper flange and a lower flange, and an elongated member in the throttling direction, that is, a longitudinal direction, in the present invention, the concrete beam 1 The longitudinal cross-sectional shape is not limited to this, and may have various shapes such as a simple rectangular shape and a T-shape.

The heat-reinforced steel material 2 is a member made of a steel plate elongated in the longitudinal direction. The buried anchor 21 is integrally provided on the lower surface of the steel-reinforced steel material 2. The buried shear connection member 22 made of studs or the like is integrally formed . The reinforcing steel material 2 is disposed at a distance from the upper surface of the concrete beam 1 in the vertical direction and the lower end of the buried anchor 21 is embedded and fixed in the concrete beam 1, The concrete beams 1 are integrally combined. 2, the steel concrete composite girder 100 according to the present invention has a cross section of the concrete beam 1 and a cross section of the heat-reinforced steel material 2 in the longitudinal cross-sectional view, Reinforced steel material 2 in addition to the sectional force of the concrete beam 1 and therefore the sectional force exerted by the entire steel concrete composite girder 100 is much larger than that of a girder made only of a concrete beam, The shape of the concrete composite girder 100 is greatly reduced. That is, according to the present invention, a composite concrete girder (100) having a very low profile and a low profile can be formed by integrally combining the concrete beam (1) and the heat reinforcing steel material (2).

In the case of the embodiment illustrated in the figures, the buried anchor 21 is integrally formed with the concrete beam 1 while the heat-reinforced steel 2 is disposed at a distance from the upper surface of the concrete beam 1, Called "L-shaped stud anchor" is used, but the configuration of the buried anchor 21 is not limited thereto and can be modified into various forms.

As shown in FIGS. 3 and 4, a slab 4 made of cast-in-place concrete is integrally formed on the concrete beam 1 of the steel concrete composite girder 100 of the present invention to form a bridge structure. In this case, Reinforced steel material 2 is fully embedded in the slab 4 so that the concrete placed for the construction of the slab 4 adheres to the gap between the lower surface of the heat-reinforced steel material 2 and the upper surface of the concrete beam 1 It is preferable that the heat-reinforced steel material 2 is provided with through-holes 23 communicating with each other in the vertical direction so as to be filled with the heat- Reinforced steel material 2 and the concrete beam 1 when the concrete is poured for the construction of the slab 4 so that the concrete passes through the through- So that the gap between the upper surfaces of the upper and lower surfaces is more easily and more faithfully filled.

In the steel concrete composite girder (100) of the present invention, the basic heat ray (3) generated by electricity is installed in the heat-strengthened steel material (2). It is preferable that the basic heat line 3 is disposed on the entire length of the heat-reinforced steel material 2 in the longitudinal direction and is disposed in close contact with the surface of the heat-reinforced steel material 2. In particular, It is more preferable to be provided on the upper surface of the heat-reinforced steel material 2 as shown in the figure. However, the basic heat line 3 may be provided in close contact with the lower surface of the heat-reinforced steel material 2. Further, in order to further multiply the effect of the basic heat line 3, it is preferable to arrange the basic heat lines 3 so as to alternate in the lateral direction and zigzag as illustrated in the figure.

When the concrete is placed on the upper portion of the composite concrete girder 100 and the reinforcing steel material 2 is embedded in the slab 4, the basic heat line 3 is also embedded in the concrete of the slab 4. At this time, the end portion of the basic heat line 3 is drawn out to the outside of the slab 4 and is connected to a power source. When electric power is supplied to the basic heat line 3 in the winter season with the basic heat line 3 embedded in the slab 4, the basic heat line 3 having electric resistance is heated, and the heat generated is transmitted to the slab 4 And the temperature of the slab 4 is increased. As a result, it is possible to prevent the occurrence of freezing phenomenon on the upper surface of the slab 4. In particular, as described above, when the basic heat line 3 is disposed in close contact with the heat-reinforced steel material 2 over the longitudinal length of the heat-reinforced steel material 2, So that the heat generated by the basic heat line 3 is transferred to the slab 4 through the heat-reinforced steel material 2 in a wide range, There is an advantage to be exercised in the range.

FIG. 5 is a schematic perspective view showing a state in which a plurality of steel concrete composite girders 100 according to the present invention are continuously arranged in a longitudinal direction. FIG. 6 is a schematic plan view of the state shown in FIG. Are shown. As shown in FIGS. 5 and 6, a plurality of steel concrete composite girders 100 according to the present invention may be continuously arranged in a longitudinal direction, and the steel concrete composite girder 100 may be continuous in a longitudinal direction The slab 4 can be integrally constructed thereon. FIG. 7 is a schematic perspective view showing a state in which the slabs 4 are integrally installed on the continuous steel concrete composite girder 100. FIG.

At the continuous point portion where the composite concrete composite girder 100 is continuous, a tensile force may act on the slab 4 due to the occurrence of the moment. In the case of the present invention, the continuous end heating hot wire 30 is provided on the continuous end of the steel concrete composite girder 100 forming the moment generating section of the continuous point portion where the moment is generated in the slab 4, 2). The continuous end heating wire 30 is also made of a member that is heated by electricity in the same manner as the basic heating wire 3. The continuous end heating wire 30 is connected to the continuous end of the steel concrete composite girder 100, Reinforced steel material (2).

In the state where the continuous end heating hot wire 30 is provided on the heat-reinforced steel material 2 in the moment of occurrence of the consecutive focal points where the composite concrete girder 100 is continuously continuous, Reinforced steels 2 of adjacent steel concrete composite girders are connected to each other and subsequently the slabs 4 are integrally installed on the upper part of the steel concrete composite girder 100. At this time, electricity is supplied to the continuous end heating hot wire 30 through a power source to heat the concrete before the concrete is placed for the construction of the slab 4. When electric power is supplied to the continuous end heating wire 30 made of electrical resistance and the continuous end heating wire 30 is heated, the hot reinforcing steel material 2 which is in close contact is heated and thermally expanded in the longitudinal direction . In Fig. 5, the arrow M shows the direction in which the heat-strengthened steel material 2 expands.

Reinforced steel material 2 is connected in the longitudinal direction at the continuous point portion and the continuous end portion of the heat-reinforced steel material 2 is heated and thermally expanded by the heat of the continuous end portion heating wire 30, The concrete is placed on the concrete beam 1 so that the slab 4 is installed. The reinforcing steel material 2 maintains the thermal expansion state while the concrete is cured and cured. For this purpose, it is preferable that the continuous end heating hot wire 30 is continuously supplied with electric power to generate heat even during concrete curing of the slab 4. To maintain the connection state with the power source, And is drawn out to the outside of the slab 4 as in the case of the hot wire 3.

When the concrete is cured and the slab 4 is completed, the supply of electricity to the continuous end heating hot wire 30 is stopped to stop the heat generation, the heat-reinforced steel material 2 is cooled, Since the heat-reinforced steel material 2 is integrated with the slab 4, the heat-reinforced steel material 2 is cooled and shrunk and the slab 4 is subjected to compressive stress due to shrinkage . That is, the continuous end portion of the heat-reinforced steel material 2, which has been thermally expanded due to the heating of the continuous end portion heating wire 30 in the moment of occurrence of the moment at the consecutive portion where the moment is generated in the slab 4, The steel material 2 shrinks in temperature and accordingly the prestress in the direction to be shrunk, that is, the compression prestress, is introduced into the slab 4 integrated with the heat-reinforced steel material 2. In Fig. 7, the arrow N shows the direction in which the compression prestress is introduced into the slab 4.

Therefore, according to the present invention, it is possible to reduce the arrangement of the tendons necessary for introducing the compression prestress corresponding to the tensile stress generated in the slab 4 due to the moment at the continuous point portion, It is possible to improve the economical efficiency of the construction by reducing the cost required, and even when the thickness of the slab is small and it is difficult to arrange a sufficient amount of the tendon, it is possible to effectively cope with the generation of tensile stress due to the momentum.

On the other hand, in the case of the embodiment illustrated in the drawings referred to in the above description, although the lateral width of the heat-reinforced steel 2 is shown as being constant with respect to the length of the entire girder, 2 may be wider than other portions. Fig. 8 is a schematic perspective view corresponding to Fig. 5 for another embodiment of the present invention in which the transverse width of the heat-reinforced steel material 2 is enlarged at successive focal points continuous with the neighboring steel concrete composite girder And Fig. 9 shows a schematic plan view of the state shown in Fig. The lateral width of the heat-reinforced steel material 2 may be enlarged to a greater extent than the other portions at successive focal points where adjacent steel-concrete composite girders are connected to each other and are continuous as in the embodiment illustrated in Figs. When the heat-reinforced steel material 2 has an enlarged transverse width in the continuous point portion, the amount of the steel material which resists the tensile force increases at the continuous point portion where the momentum is generated. After the heating of the continuous end heating wire 30 The amount of the prestress introduced due to cooling shrinkage also increases, thereby exhibiting an advantageous effect of increasing the tensile rigidity with respect to the momentum.

1: Concrete beam
2: Heat-strengthened steel
3: Basic heat line
4: Slab
30: Continuous end heating wire

Claims (3)

An I-shaped section of concrete beam (1) having an upper flange, an abdomen and a lower flange;
And a lower end portion of the buried anchor 21 is disposed at a position spaced apart from the upper surface of the concrete beam 1 in the vertical direction, Reinforced steel material (2) integrally joined with the concrete beam (1) by being embedded and fixed in the concrete beam (1);
When the slab 4 is installed on the top of the concrete beam 1, the heat-reinforced steel 2 is embedded in the concrete of the slab 4 and integrated with the slab 4;
The basic heat line 3 which is heated by electricity and heats the heat-reinforced steel material 2 is disposed in close contact with the lower surface of the heat-reinforced steel material 2 in the longitudinal direction and is laid over the entire length of the heat- When the slab 4 is constructed so that the reinforcing steel 2 is embedded in the concrete of the slab 4, the temperature of the reinforcing steel material 2 is increased by heating the basic heat line 3, Reinforced steel material 2 to the slab 4 to raise the temperature of the slab 4 to make the slab 4 freeze;
The longitudinal width of the reinforcement steel (2) at the continuous end corresponding to the moment of occurrence of the consecutive point at which the moment is generated in the slab (4) is continuous with the longitudinally adjacent steel concrete composite girder Larger;
Reinforced steel material (2) is disposed in close contact with the continuous end portion where the lateral width is widened, the continuous end portion heating wire (30) being heated by electric power supply;
When the heat-reinforced steels 2 of the longitudinally adjacent steel-concrete composite girders are connected to each other for the sequential production of the steel-concrete composite girder, the continuous end portion of the heat-strengthened steel material 2 is heated by the heat of the continuous- Reinforced steel material 2 is buried in the heat-expanded state, the concrete is placed on the concrete beam 1, and the slab 4 is installed. After that, the heating of the continuous end portion heating wire 30 is stopped, (2) is cooled and contracted so that a compressive prestress is introduced into the slab (4) at the moment of the moment of the slab (4);
So that the concrete of the slab 4 can be faithfully filled in the gap between the lower surface of the heat-reinforced steel material 2 and the upper surface of the concrete beam 1 when the heat-reinforced steel material 2 is completely buried in the slab 4. [ And a reinforcing steel material (2) is provided with through holes (23) communicating with each other in the vertical direction. delete delete
KR1020140132460A 2014-10-01 2014-10-01 Composite Girder with Heating-Reinforcing Steel Member and Concrete Member KR101515979B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200034487A (en) 2018-09-21 2020-03-31 (주)리튼브릿지 Girder with Heating System and Bridge Construction Method Thereof
KR102217153B1 (en) 2020-05-22 2021-02-19 세종대학교산학협력단 Efficient Steel Composite Girder System with Minimized height
KR20220077267A (en) 2020-12-01 2022-06-09 한우물중공업 주식회사 Efficient Steel Composite Girder System with Minimized height

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20090003807A (en) * 2007-07-03 2009-01-12 연세대학교 산학협력단 The continuous bridge structure including a prestressing plate and it's building method
KR100937252B1 (en) * 2007-06-20 2010-01-15 주식회사 에스유건설 Prestressed steel composite beam and a manufacturing method thereof
KR101421069B1 (en) * 2012-06-29 2014-07-18 김정호 Freezing prevent system of road using a heating cable

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100937252B1 (en) * 2007-06-20 2010-01-15 주식회사 에스유건설 Prestressed steel composite beam and a manufacturing method thereof
KR20090003807A (en) * 2007-07-03 2009-01-12 연세대학교 산학협력단 The continuous bridge structure including a prestressing plate and it's building method
KR101421069B1 (en) * 2012-06-29 2014-07-18 김정호 Freezing prevent system of road using a heating cable

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200034487A (en) 2018-09-21 2020-03-31 (주)리튼브릿지 Girder with Heating System and Bridge Construction Method Thereof
KR102217153B1 (en) 2020-05-22 2021-02-19 세종대학교산학협력단 Efficient Steel Composite Girder System with Minimized height
KR20220077267A (en) 2020-12-01 2022-06-09 한우물중공업 주식회사 Efficient Steel Composite Girder System with Minimized height

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