KR100250937B1 - The manufacturing method of a simple beam type preflex composite beam by temporary hinge - Google Patents
The manufacturing method of a simple beam type preflex composite beam by temporary hinge Download PDFInfo
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- KR100250937B1 KR100250937B1 KR1019980008385A KR19980008385A KR100250937B1 KR 100250937 B1 KR100250937 B1 KR 100250937B1 KR 1019980008385 A KR1019980008385 A KR 1019980008385A KR 19980008385 A KR19980008385 A KR 19980008385A KR 100250937 B1 KR100250937 B1 KR 100250937B1
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- compressive stress
- preflex composite
- composite beam
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/29—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures
- E04C3/293—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures the materials being steel and concrete
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
- E04C3/10—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal prestressed
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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
- 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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- 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
- E01D2101/30—Metal
- E01D2101/32—Metal prestressed
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- Engineering & Computer Science (AREA)
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- Composite Materials (AREA)
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Abstract
Description
기존의 단순보형 프리플렉스 합성보는 초기의 크리프와 건조수축에 의해 하부 케이싱 콘크리트에 도입된 압축응력이 감소되는 현상이 발생하기 때문에 본 발명에 의한 가지지점을 이용한 단순보형 프리플렉스 합성보의 제작공법인 가지지점을 이용하여 추가적인 압축응력을 도입할 수 있고 기존의 단면보다 적은 단면으로 설계가 가능하다.The existing simple beam preflex composite beam has a phenomenon in which the compressive stress introduced into the lower casing concrete decreases due to the initial creep and dry shrinkage, and thus the branch beam which is a manufacturing method of the simple beam preflex composite beam using the branch point according to the present invention. By using it, additional compressive stress can be introduced and the design can be made with smaller cross section than the existing cross section.
본 발명은 기존의 단순보형 프리플렉스 합성보의 제작에서 크리프와 건조수축에 의한 압축응력의 감소를 지간중앙에 설치된 가지지점을 상승 및 하강시킴으로써 추가적인 압축응력의 도입으로 사하중 및 활하중에 의해 발생하는 최종적인 인장응력을 감소시킬 수 있다.In the present invention, the conventional simple beam preflex composite beams are fabricated by dead and live loads by introducing additional compressive stresses by increasing and decreasing branch points installed in the middle of the reduction of compressive stress caused by creep and dry shrinkage. Tensile stress can be reduced.
제1도는 기존의 단순보형 프리플렉스 합성보의 제작원리도.1 is a manufacturing principle of a conventional simple beam preflex composite beam.
제2도는 기존의 단순보형 프리플렉스 합성보에 긴장재를 프리스트레싱하여 추가적인 압축응력을 도입하는 원리도.2 is a principle diagram for introducing an additional compressive stress by prestressing tension members to existing simple beam preflex composite beams.
제3도는 본 발명에 의한 가지지점을 이용한 단순보형 프리플렉스 합성보의 제작원리도.3 is a manufacturing principle diagram of a simple beam-type preplex composite beam using a branch point according to the present invention.
제4(a)도는 본 발명에 의한 가지지점을 이용한 단순보형 프리플렉스 합성보에서 프리플렉션하중을 재하한 상태에서 하부 케이싱 콘크리트를 타설한 경우의 단면값.Figure 4 (a) is a cross-sectional value in the case of pouring the lower casing concrete in the state of loading the preflection load in the simple beam preflex composite beam using the branch point according to the present invention.
제4(b)도는 본 발명에 의한 가지지점을 이용한 단순보형 프리플렉스 합성보에서 가지지점을 상승시킨 후의 상부케이싱 콘크리트와 복부 콘크리트를 타설한 경우의 단면값.4 (b) is a cross-sectional value when the upper casing concrete and the abdominal concrete is poured after the branch point is raised in the simple beam preflex composite beam using the branch point according to the present invention.
제5(a)도는 본 발명에 의한 가지지점을 이용한 단순보형 프리플렉스 합성보의 단면제원과 최종응력도.Figure 5 (a) is a cross-sectional specification and final stress of the simple beam-type preflex composite beam using the branch point according to the present invention.
제5(b)도는 기존의 단순보형 프리플렉스 합성보의 단면제원과 최종응력도.Figure 5 (b) is a cross-sectional specification and final stress of the conventional simple beam preflex composite beam.
기존의 단순보형 프리플렉스 합성보는 시공의 신속성, 형고감소, 재료절감 및 피로파괴 강도의 향상 등의 장점이 있어 지금까지 널리 시공되어 왔다. 이러한 기존의 단순보형 프리플렉스 합성보는 강재 I-형 보를 중앙부분이 상부로 휘어지도록 제작한 후 프리플렉션 하중을 재료의 탄성범위내에서 하향으로 가한 상태에서 강계의 하부 플랜지에 케이싱 콘크리트를 타설 및 양생한 후 프리플렉션하중을 제거함으로써 하부 케이싱 콘크리트에 압축응력을 도입하여 사하중 및 활하중에 의해 발생하는 하부플랜지 부분의 인장응력을 감소시키도록 제작한다. (제1도 참조) 그러나 이러한 제작공법은 프리플렉션하중을 재하한 상태에서 하부케이싱 콘크리트를 타설 및 양생하는 과정에서 1차적으로 크리프와 건조수축에 의해 압축응력이 감소하게 된다. 따라서 이러한 압축응력의 감소를 방지하기 위하여 긴장재를 이용하여 추가적으로 압축응력을 도입하는 방법이 이용되고 있으나 제작상의 번거로움뿐만 아니라 긴장재를 긴장하는등의 추가적인 비용이 들게 된다. (제2도 참조) 따라서 이러한 기존의 단순보형 프리플렉스 합성보에서 압축응력이 손실되는 등의 문제점을 해결할 수 있는 공법으로 본 발명에서는 가지지점을 이용한 단순보형 프리플렉스 합성보의 제작공법을 개발하였다. 본 발명에 의한 가지지점을 이용한 단순보형 프리프렉스 합성보의 제작공법의 순서를 보면 다음과 같다.The conventional simple beam preflex composite beam has been widely constructed so far because of its advantages such as quickness of construction, high moldability, material reduction, and improvement of fatigue strength. The conventional simple beam preflex composite beam is made of steel I-shaped beam to be bent upward in the center, and then cast and cure casing concrete on the lower flange of the steel system while applying a preflection load downward within the elastic range of the material. Then, by removing the preflection load, the compressive stress is introduced to the lower casing concrete to reduce the tensile stress of the lower flange portion caused by dead and live loads. However, this manufacturing method primarily reduces the compressive stress due to creep and dry shrinkage during the casting and curing of the lower casing concrete under the preflection load. Therefore, in order to prevent the reduction of the compressive stress, an additional method of introducing a compressive stress using a tension material is used, but it is not only cumbersome in manufacturing but also additional costs such as tensioning the tension material. Therefore, in the present invention, a method for manufacturing a simple beam preflex composite beam using a branch point has been developed as a method for solving problems such as loss of compressive stress in the conventional simple beam preflex composite beam. Looking at the procedure of the manufacturing method of the simple beam preprex composite beam using the branch point according to the present invention.
제3(a)도는 기존의 단순보형 프리플렉스 합성보와 마찬가지로 프리플렉션 하중을 재하한 상태에서 하부 케이싱 콘크리트를 타설하여 양생한 후 교대사이에 거치하여 지간 중앙에 가지지점을 설치한 상태도이다. 제3(b)도는 본 발명에 의한 가지지점을 상승시킨 상태에서 상부 케이싱 콘크리트와 복부콘크리트를 타설 및 양생하는 상태도이다. 제3(c)도는 상부 케이싱 콘크리트가 양생된 후 가지지점을 하강함으로써 하부 케이싱 콘크리트에 추가적인 압축응력을 도입하는 상태도이다. 기존의 단순보형 프리플렉션 합성보는 프리프렉션 하중을 재하한 상태에서 하부케이싱 콘크리트가 양생되면서 크리프와 건조수축에 의해 콘크리트에 발생하는 인장응력이 프리플렉션 하중에 의해 하부케이싱 콘크리트에 도입되는 압축응력을 감소시키게 된다. 따라서 지간 중앙의 가지지점을 상승 및 하강시킴으로써 크리프와 건조수축에 의한 압축응력의 감소를 보충할 수 있다.FIG. 3 (a) is a state diagram in which a branch point is installed in the center of a bridge by placing the lower casing concrete in a state in which a preflex load is loaded and curing it, as in the conventional simple beam preflex composite beam. 3 (b) is a state diagram in which the upper casing concrete and the abdominal concrete are poured and cured in a state where the branch point according to the present invention is raised. 3 (c) is a state diagram in which additional compressive stress is introduced to the lower casing concrete by lowering the branch point after the upper casing concrete is cured. As the existing simple beam preflection composite beam is loaded under the prefraction load, the lower casing concrete is cured and the tensile stress generated in the concrete by creep and dry shrinkage decreases the compressive stress introduced into the lower casing concrete due to the preflection load. Let's go. Therefore, it is possible to compensate for the reduction of compressive stress due to creep and dry shrinkage by raising and lowering the branch point in the middle of the trunk.
제4(a)도는 본 발명에 의한 가지지점을 이용한 프리플렉션 하중을 재하한 상태에서 하부케이싱 콘크리트를 타설 및 양생한 후의 단면값이다. 제4(b)도는 가지지 점을 이용한 단순보형 프리플렉스 합성보에서의 최종단면에 대한 단면값이다.FIG. 4 (a) is a cross-sectional value after placing and curing the lower casing concrete in the state which loaded the preflexion load using the branch point by this invention. FIG. 4 (b) is a cross-sectional value of the final section in the simple beam-type preflex composite beam using the branch point.
제5(a)도는 본 발명에 의한 가지지점을 이용한 단순보형 프리플렉스 합성보의 30m 지간에 대한 단면도 및 최종응력도이다. 제5(b)도는 기존의 단순보형 프리플렉스 합성보의 30m 지간에 대한 단면도 및 응력도이다. 제5(a)도는 가지지점의 상승 및 하강에 의해 추가적인 압축응력을 도입할 수 있기 때문에 제5(b)도보다 적은 단면으로 설계가 가능하며 상·하부 플랜지의 강재량 및 콘크리트량을 감소시킬 수 있다. 또한 최종적으로 하부 케이싱 콘크리트의 하단부에서의 인장응력이 기존의 단순보형 프리플렉스 합성보는 61.43 kg/㎠인 반면에 본 발명에 의한 가지지점을 이용한 단순보형 프리플렉스 합성보는 20.97 kg/㎠으로 응력을 약 30%로 감소시킬 수 있다. 제5(a),(b)도의 강재량 및 콘크리트량을 비교하면 다음과 같다. 제5(a)도와 같이 본 발명에 의한 가지지점을 이용한 단순보형 프리플렉스 합성보의 강재량은 586㎠이고 콘크리트량은 9300㎠이며 제5(b)도와 같이 기존의 단순보형 프리프리스 합성보는 강재량은 806㎠이고 콘크리트량은 10100㎠로 강재량 및 콘크리트량을 대폭 감소시킬 수 있다.5 (a) is a cross-sectional view and final stress diagram for the 30m section of the simple beam-type preflex composite beam using the branch point according to the present invention. Figure 5 (b) is a cross-sectional view and the stress diagram for 30m section of the conventional simple beam preflex composite beam. In FIG. 5 (a), additional compressive stress can be introduced by the rise and fall of the branch point, so that it is possible to design a cross section smaller than in FIG. 5 (b) and to reduce the amount of steel and concrete in the upper and lower flanges. Can be. In addition, while the tensile stress at the lower end of the lower casing concrete is 61.43 kg / ㎠ of the conventional simple beam preflex composite beam, the simple beam preflex composite beam using the branch point according to the present invention reduces the stress to 20.97 kg / ㎠. Can be reduced to 30%. Comparing the steel amount and the concrete amount of the fifth (a), (b) is as follows. As shown in FIG. 5 (a), the amount of steel of the simple beam-type preflex composite beam using the branch point according to the present invention is 586cm2, and the amount of concrete is 9300cm2. Is 806cm2 and the amount of concrete is 10100cm2, which can greatly reduce the amount of steel and concrete.
본 발명은 프리프렉션 하중을 재하하여 하부 케이싱 콘크리트를 타설 및 양생한 후 현장에서 교대사이에 거치한 후 지간중앙에 가지지점을 설치하여 가지지점을 상승시켜 상부 케이싱 및 복부 콘크리트를 타설 및 양생한 후 가지지점을 하강시킴으로서 하부 케이싱 콘크리트에 압축응력을 추가적으로 도입할 수 있는 공법이다.The present invention loads and cures the lower casing concrete by loading the pre-fraction load, and then mounted between the shifts in the field and then set up branch points in the middle of the trunk to raise the branch points and then cast and cure the upper casing and the abdominal concrete. By lowering the branch point, it is a method that can additionally introduce compressive stress to the lower casing concrete.
본 발명은 가지지점을 이용하여 하부 케이싱 콘크리트에 추가로 압축응력을 도입할 수 있기 때문에 최종적으로 사하중 및 활하중에 의해 발생하는 하부 케이싱 콘크리트의 하단부에서의 인장응력을 기존에 비해 30% 정도로 감소시킬 수 있으며 사용물량에서 강재 및 콘크리트량을 대폭감소시킬 수 있다.Since the present invention can introduce additional compressive stress to the lower casing concrete using the branch point, the tensile stress at the lower end of the lower casing concrete generated by dead and live loads can be reduced to about 30% compared to the conventional one. It can greatly reduce the amount of steel and concrete in the quantity used.
본 발명의 목적은 기존의 단순보형 프리플렉스 합성 보에서 크리프와 건조수축에 의한 압축응력의 감소를 방지하기 위해 지간중앙에 가지지점을 설치하여 상승 및 하강시켜 추가적인 압축응력을 도입함으로써 크리프와 건조수축에 의한 압축응력의 감소를 막을수 있고 강재 및 콘크리트량을 대폭 감소시킬 수 있는 가지지점을 이용한 단순보형 프리플렉스 합성보의 제작공법을 제공함에 있다.An object of the present invention is to increase and decrease the creep and dry shrinkage by installing a branch point in the middle of the inter-center to prevent the reduction of the compressive stress due to creep and dry shrink in the conventional simple beam preflex composite beam It is to provide a manufacturing method of a simple beam preflex composite beam using a branch point that can prevent the reduction of the compressive stress due to and significantly reduce the amount of steel and concrete.
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KR20030067789A (en) * | 2002-02-08 | 2003-08-19 | 구민세 | The method for reducing stress concentration with a temporary support lifted up and down in composite bridge |
KR100396713B1 (en) * | 2000-09-22 | 2003-09-02 | (주)스틸엔콘크리트 | The method of prestressed composite beam made by using the additional compressive materials |
CZ297559B6 (en) * | 2004-03-16 | 2007-02-07 | Rojík@Václav | Floor concrete beam and process for producing thereof |
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KR100396715B1 (en) * | 2001-05-28 | 2003-09-02 | (주)스틸엔콘크리트 | The method of prestressed composite beam made by using incrementally prestressing |
KR20030030101A (en) * | 2001-10-08 | 2003-04-18 | 이형훈 | a method for removing residual stress of prestressed composite beam and prestressed composite beam using the same |
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1998
- 1998-03-13 KR KR1019980008385A patent/KR100250937B1/en not_active IP Right Cessation
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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KR100396713B1 (en) * | 2000-09-22 | 2003-09-02 | (주)스틸엔콘크리트 | The method of prestressed composite beam made by using the additional compressive materials |
KR20030067789A (en) * | 2002-02-08 | 2003-08-19 | 구민세 | The method for reducing stress concentration with a temporary support lifted up and down in composite bridge |
CZ297559B6 (en) * | 2004-03-16 | 2007-02-07 | Rojík@Václav | Floor concrete beam and process for producing thereof |
KR102485849B1 (en) | 2021-12-23 | 2023-01-09 | 구민세 | Manufacturing method of pre-flex composite beam that causes bulging due to plastic deformation of steel beam |
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KR19980019378A (en) | 1998-06-05 |
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