KR20040054639A - External Prestressing Method of PS Concrete Composite Girder Bridge by Anchoring and Holding Tendon on Precast Cross-Beam - Google Patents

External Prestressing Method of PS Concrete Composite Girder Bridge by Anchoring and Holding Tendon on Precast Cross-Beam Download PDF

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KR20040054639A
KR20040054639A KR1020040038811A KR20040038811A KR20040054639A KR 20040054639 A KR20040054639 A KR 20040054639A KR 1020040038811 A KR1020040038811 A KR 1020040038811A KR 20040038811 A KR20040038811 A KR 20040038811A KR 20040054639 A KR20040054639 A KR 20040054639A
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girder
external
prefabricated
concrete
tendon
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KR1020040038811A
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Korean (ko)
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KR100696646B1 (en
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연정흠
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연정흠
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    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2/00Bridges characterised by the cross-section of their bearing spanning structure
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2101/00Material constitution of bridges
    • E01D2101/20Concrete, stone or stone-like material
    • E01D2101/24Concrete
    • E01D2101/26Concrete reinforced
    • E01D2101/28Concrete reinforced prestressed
    • E01D2101/285Composite prestressed concrete-metal

Abstract

PURPOSE: An external prestressing method of a PS concrete composite girder by a tendon anchored/supported to a prefabricated beam is provided to apply external tensile force without the control of traffic volume or the removal of a board, to compensate or reinforce tensile force, to have a wide working space and to prevent the damage of a girder. CONSTITUTION: The external prestressing method of a PS concrete composite girder bridge by a tendon anchored and supported to a prefabricated cross beam comprises the steps of anchoring/supporting an anchorage(10) and a holding anchorage(14) buried in a cross beam while fixing to a joint reinforcing steel box of a prefabricated cross beam, fixing an anchorage(10) of an external tendon(20) to a joint steel box(14) of a support cross beam(11), and fixing a supporter(14) to a joint steel box(16) of a beam(15) or a joint steel box of an inner support cross beam to change the direction of the external tendon(20). The tensile force applied on a cross beam by the external tendon(20) is transferred to a PS concrete girder or a composite girder by perpendicular frictional connection of the cross beam-girder joint reinforcing steel boxes(16) of a prefabricated intermediate cross beam(15) and an inner support cross beam by end bearing pressure on an anchoring end.

Description

조립식 가로보에 정착 및 지지된 긴장재에 의한 PS 콘크리트 합성거더 교량의 외부긴장 공법 {External Prestressing Method of PS Concrete Composite Girder Bridge by Anchoring and Holding Tendon on Precast Cross-Beam}External Prestressing Method of PS Concrete Composite Girder Bridge by Anchoring and Holding Tendon on Precast Cross-Beam}
긴장재(tendon)에 대한 방청기술의 향상과 사용 중인 PS(prestressed) 콘크리트 교량의 보강 및 단순 거더의 연속화 수단으로 외부긴장공법(external prestressing method)에 대한 수요가 빠른 속도로 증가하고 있다. PS 콘크리트 거더에 대한 외부긴장공법은 PS 콘크리트 거더 외부에 배치되는 긴장재의 정착구(anchorage)와 지지구(holding anchorage)의 설치방법에 의해 그 효율성이 결정된다. 또한 최근에는 신설되는 PS 콘크리트 교량에 추후 발생될 긴장력의 손실과 교량등급의 상향조정에 대비해서 외부긴장력의 도입을 위한 정착구와 지지구를 미리 설치하는 추세이다.The demand for an external prestressing method is rapidly increasing as a result of the improvement of rust prevention technology for the tendons, the reinforcement of the PS (prestressed) concrete bridges in use, and the sequencing of simple girders. The external tensioning method for PS concrete girder is determined by the installation method of anchoring and holding anchorage of tension member disposed outside PS concrete girder. In addition, in recent years, in order to prevent the loss of tension and to raise the grade of the bridge in the PS concrete bridges, new anchorages and supports for the introduction of external tension are being installed in advance.
사용 중인 PS 콘크리트 거더 교량의 보강을 위해 외부긴장력을 도입하기 위한 가장 일반적인 방법으로는 구멍을 뚫은 PS 콘크리트 거더에 강재(steel) 정착장치를 앵커볼트 또는 강봉으로 고정(국내출원 10-2002-0040223, 10-2002-0058112, 20-2000-0020363, 20-2001-0004505, 20-2001-0035616)하는 것이다. 거더와 정착장치 사이의 마찰력을 증가시키기 위해 에폭시모탈이 접촉면에 삽입(국내출원 02-2002-0017224)되기도 하며, 가로보 또는 거더에 부착된 정착장치로 바닥판(slab)에 외부긴장이 도입(국내출원 20-2002-003689)하는 방법도 개발되었다. 그러나 앵커볼트 또는 강봉에 의한 PS 콘크리트 거더의 천공(punching)은 거더 자체에 손상을 준다. 이러한 문제를 해결하기 위해 단순 지지구를 아래 프랜지에 끼워 넣는 방법(국내출원 10-2003-0069030)으로 처짐이 클수록 보강효과를 높이기도 한다. 또한 신설되는 교량에 대해서는 PS 콘크리트 거더에 추후 외부긴장재의 도입을 위해 거더의 플랜지 하단부에 외부긴장재의 정착과 지지를 위한 강재 블록(국내출원 10-2001-0060681)을 일체로 타설하기도 하며, 정착구 및 지지구의 부착을 위한 상자형 강재 보강판을 PS 콘크리트 거더에 미리 설치(국내출원 10-2004-0009282, 10-2004-0017706)하기도 한다.The most common method for introducing external tension to reinforce the PS concrete girder bridge in use is to fix the steel fixing device with anchor bolts or steel rods to the perforated PS concrete girder (Domestic Application 10-2002-0040223, 10-2002-0058112, 20-2000-0020363, 20-2001-0004505, 20-2001-0035616. In order to increase the friction between the girder and the fixing device, epoxy mortar is sometimes inserted into the contact surface (domestic application 02-2002-0017224), and external tension is introduced into the slab by the fixing device attached to the cross beam or girder Application 20-2002-003689 has also been developed. However, the punching of PS concrete girders by anchor bolts or steel rods damages the girder itself. In order to solve this problem, a simple support is inserted into the lower flange (domestic application 10-2003-0069030), and the larger the deflection, the higher the reinforcing effect. In addition, for the new bridges, steel blocks (domestic application 10-2001-0060681) are installed in the PS concrete girder to fix and support the external tension material at the bottom of the flange of the girder for the introduction of external tension material. Box-shaped steel reinforcement plates for attachment of supports are also pre-installed on PS concrete girders (Domestic Application 10-2004-0009282, 10-2004-0017706).
외부긴장공법은 PS 콘크리트 합성거더 교량의 기본적인 구조가 완성된 후 추가 긴장력의 도입과 단순 거더의 강재적인 연속화 그리고 사용 중에 손실된 긴장력의 보완과 보강을 위한 재긴장 등을 위해 그 중요성이 높아지고 있다. 그러나 이를 위해서는 정착구와 지지구에 도입된 긴장력이 안전하게 PS 콘크리트 거더로 전달될 수 있어야 한다. 본 공법은 기존의 연결 강상자로 보강된 조립식 가로보(국내출원 10-2004-0032551)에 외부긴장재의 정착구와 지지구를 설치하여 정착단부의 지압(bearing)에 의한 PS 콘크리트 거더에 외부긴장력의 도입과 절곡부의 연직력에 대한 마찰로 PS 콘크리트 합성거더 교량에 효율적이면서 안전한 방법으로 외부긴장력을 도입하기 위한 방법이다.The external tensioning method is becoming more important for the introduction of additional tension force, steel continuity of simple girder and retension to compensate and reinforce tension loss during use after the basic structure of PS concrete composite girder bridge is completed. However, this requires that the tensions introduced into the anchorage and support can be safely transferred to the PS concrete girder. In this method, the external tension is introduced into PS concrete girder by the bearing of the anchoring end by installing the anchor and support of external tensioning material in the prefabricated cross beam (domestic application 10-2004-0032551) reinforced by the existing connecting steel box. It is a method to introduce external tension in an efficient and safe way to PS concrete composite girder bridges by friction against the vertical force of the bending section.
PS 콘크리트 거더에 도입되는 외부긴장력은 긴장력이 손실 보완과 거더의 보강 그리고 단순 거더의 연속화 등에 매우 중요하다. 그러나 기존의 일반적인 정착구와 지지구의 설치에는 PS 콘크리트 거더의 손상과 사용 중인 교량에 대한 시공과정의 어려움 등 많은 문제가 발생된다. 외부긴장재의 정착구와 지지구를 조립식 가로보의 연결부 보강 강상자에 고정한 본 공법은 기존의 교량에서 발생되는 다음의 문제들을 효율적으로 해결하기 위한 것이다.External tension applied to PS concrete girders is very important for tension loss compensation, reinforcement of girders and sequencing of simple girders. However, there are many problems in the installation of conventional anchorages and supports, such as damage to the PS concrete girder and difficulty in the construction process for the bridge in use. This method of fixing the anchorage and support of external tension member to the reinforcing steel box of the prefabricated crossbeam is to solve the following problems in the existing bridge efficiently.
1. 정착구와 지지구를 고정하기 위한 천공작업으로 발생하는 거더의 손상방지1.Prevention of damage to the girder caused by the drilling work to fix the anchorage and the support
2. 정착구와 지지구에 도입된 외부긴장력의 PS 콘크리트 거더로 안전한 전달2. Safe transmission to PS concrete girder with external tension introduced into anchors and supports
3. 외부긴장력을 도입하기 위한 작업공간의 확보3. Securing the work space for introducing external tension
4. 거더와 바닥판의 합성단면에 대한 외부긴장력의 도입4. Introduction of External Tension to Composite Section of Girder and Deck Plates
5. 내부지점에서 연속화된 연결부의 연속성 확보5. Securing continuity of connected parts at internal points
[도 1] 일반적인 연속 PS 콘크리트 합성거더 교량의 사시도1 is a perspective view of a typical continuous PS concrete composite girder bridge
[도 2] 본 공법에 의한 연속 PS 콘크리트 거더의 외부긴장재 배치도2 is a layout view of the external tension material of the continuous PS concrete girder according to the present method
[도 3] 본 공법의 정착단부에서 외부긴장재의 배치 상세도3 is a layout view of the external tensioning material at the fixing end of the present method
[도 4] 본 공법의 연속된 내부지점에서 외부긴장재의 배치 상세도4 is a detailed view of the arrangement of the external tension member at the continuous internal points of the present method;
[도 5] 본 공법의 정착단부 조립식 지점가로보와 구성요소5 is a prefabricated prefabricated point gaborbo and components of the present method
[도 6] 본 공법의 절곡부 조립식 중간가로보와 구성요소6 is a prefabricated intermediate crossbeam and components of the bent portion of the present method
[도 7] 본 공법의 연속 내부지점 조립식 지점가로보와 구성요소7 is a continuous internal point prefabricated point giraffe and components of the present method
[도 8] 외부긴장재의 정착구 또는 지지구가 고정된 조립식 가로보 연결부 보강 강상자[Figure 8] Reinforcement steel box of the prefabricated crossbeam connection fixed to the anchorage or support of the external tension member
<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>
10. 외부긴장재 정착구10. External tension material anchorage
11. 정착단부 조립식 지점가로보11.Fixed end prefabricated branch
12. 정착단부 조립식 지점가로보의 거더 연결부 보강 강상자12. Reinforcement steel box of girder connection of fixing point prefabricated robot
13. 정착단부 조립식 지점가로보의 가로보 연결부 보강 강상자13. Reinforcement steel box of cross beam connection of prefabricated point
14. 외부긴장재 지지구14. External tension member support
15. 조립식 중간가로보15. prefabricated middle street robo
16. 조립식 중간가로보의 거더 연결부 보강 강상자16. Reinforcement steel box of girder connection of prefabricated middle girvo
17. 내부지점 조립식 지점가로보17. Inside point prefabricated street
18. 내부지점 조립식 지점가로보의 거더 연결부 보강 강상자18. Reinforcement steel box of girder connection of interior point prefabricated robo
19. 내부지점 조립식 지점가로보의 가로보 연결부 보강 강상자19. Reinforcement steel box of crossbeam connection of interior point prefabricated beam
20. 외부긴장재20. External tension material
21. 단부보강 PS 콘크리트 거더 (국내출원 10-2004-0009282 또는 10-2004-0017706)21. End reinforced PS concrete girder (domestic application 10-2004-0009282 or 10-2004-0017706)
22. 보강철근22. Rebar
23. 거더-바닥판 일체화를 위한 수평전단 또는 전단마찰 보강철근23. Horizontal shear or shear friction rebar for girder-floor integration
24. 용접 머리붙이 스터드24. Weld Head Studs
25. 볼팅 머리붙이 스터드 (국내출원 10-2003-0099610)25. Bolting Head Stud (Domestic Application 10-2003-0099610)
26. 볼팅 머리붙이 스터드 고정용 볼트26. Bolts for bolting head studs
27. 볼트겸용 머리붙이 스터드 (국내출원 10-2004-0026479)27. Bolted head stud (Domestic application 10-2004-0026479)
31. PS 콘크리트 거더 32. 현장타설 지점가로보31. PS concrete girder 32. On-site casting point
33. 현장타설 중간가로보 34. 교각33. On-site Middle Road 34. Pier
35. 현장타설 중간바닥판 36. 현장타설 지점바닥판35. Placement middle floor plate 36. Placement point floor plate
37. 교좌장치37. Chair Unit
일반적으로 거더(31)와 가로보(32,33)의 격자형 구조로 된 연속 PS 콘크리트 합성거더 교량은 도 1의 구조로 구성된다. 본 공법은 내부긴장재의 정착단부가 강상자(steel box)로 보강된 PS 콘크리트 거더(21)(국내출원 10-2004-0009282 또는 10-2004-0017706)와 연결부 보강 강상자가 설치된 조립식 가로보(11,15,17)(국내출원 10-2004-0032551)가 사용된 교량에 도 2와 같이 외부긴장력을 도입하기 위한 것이다. 본 공법에서 외부긴장재의 정착구와 지지구는 조립식 가로보의 연결부 보강 강상자에 고정된다.In general, a continuous PS concrete composite girder bridge having a lattice structure of the girder 31 and the cross beams 32 and 33 is configured as shown in FIG. 1. This method is a prefabricated crossbeam (11, which is equipped with PS concrete girder 21 (domestic application 10-2004-0009282 or 10-2004-0017706) where the fixing end of the internal tension member is reinforced with a steel box) 15, 17) (domestic application 10-2004-0032551) is to introduce the external tension as shown in Figure 2 used bridge. In this method, anchorages and supports of external tension members are fixed to reinforcing steel boxes of prefabricated crossbeams.
도 2의 정착단부와 연속지점에 대한 상세도는 각각 도 3 그리고 도 4와 같다. 도 3의 외부긴장재(20) 정착구(10)는 도 5와 같이 정착단부 지점가로보(11)의 제작단계에서 지점가로보의 연결부 보강 강상자(12)에 미리 고정된다. 정착단부 지점가로보(11)는 도 3과 같이 거더(21)를 가로질러 설치되기 때문에 도입된 외부긴장력은 단부 지압력(end bearing force)으로 거더에 전달된다. 외부긴장재(20)의 지지구(14)는 도 6과 같이 절곡부에 설치되는 중간가로보(15)의 연결부 강상자(16)에 고정되거나, 도 7과 같이 연속화된 내부지점에 거더를 가로질러 설치되는 지점가로보(17)의 연결부 강상자(18)에 고정되어 가로보에 매입된다.Details of the fixing end and the continuous point of Figure 2 are shown in Figure 3 and 4, respectively. The external tensioning material 20 anchorage 10 of FIG. 3 is fixed in advance to the connection reinforcing steel box 12 of the point gabo in the manufacturing step of the fixing end point gabor 11 as shown in FIG. Since the fixing end point gabor 11 is installed across the girder 21 as shown in FIG. 3, the external tension force introduced is transmitted to the girder with end bearing force. The support 14 of the external tensioning material 20 is fixed to the connecting box strong box 16 of the intermediate girder 15 installed in the bent portion as shown in Figure 6, or across the girder to the continuous inner point as shown in FIG. The installation point is fixed to the connection box steel box 18 of the robot 17 is embedded in the cross beam.
외부긴장재(20)의 지지구(14)는 교축방향에 대해 연직방향으로 포물선을 유지하도록 하여 가로보에는 연직방향의 등분포 하중이 작용하도록 한다. 조립식 가로보의 연결부 보강 강상자(12,16,18)에 고정된 외부긴장재(20)의 정착구(10)와 지지구(14)는 위치에 따라 도 8과 같으며, 단순 또는 연속된 전체 경간에 대해 외부긴장재의 기울기는 연속이다.The support 14 of the external tensioning material 20 is to maintain the parabola in the vertical direction with respect to the axial direction so that the equal distribution load in the vertical direction on the cross beam. The anchorage 10 and the supporter 14 of the external tensioning material 20 fixed to the connection reinforcement steel box (12, 16, 18) of the prefabricated beams are as shown in Figure 8, depending on the position, in a simple or continuous overall span The slope of the external tension material is continuous.
연결부가 강상자에 의해 보강된 조립식 가로보에 외부긴장재의 정착구와 지지구가 고정된 본 공법의 외부긴장공법의 사용은 다음의 효과를 기대할 수 있다.The use of the external tensioning method of this method, in which the anchorage and the support of the external tension member are fixed to the prefabricated crossbeam reinforced by steel box, can be expected to have the following effects.
1. 정착구와 지지구를 고정하기 위한 천공작업이 필요하지 않기 때문에 거더에 손상을 주지 않는다.1. It does not damage the girders because no drilling work is required to fix the anchorages and supports.
2. 외부긴장재의 축방향력은 지점가로보와 거더 단부의 연결부에서 지압에 의해 전달되므로 정착구와 거더 사이에 전단력이 발생되지 않는다.2. The axial force of the external tension member is transmitted by acupressure at the point of connection between the point and the end of the girder so that no shear force is generated between the anchorage and the girder.
3. 외부긴장재의 방향이 변하는 절곡부에서 중간가로보의 연결부 보강 강상자에 포물선 형태로 고정된 지지구는 가로보의 연결부에 연직방향 등분포하중을 발생시키고, 가로보와 거더 사이의 상대적으로 넓은 영역의 마찰로 가로보의 연직력은 거더로 안전하게 전달될 수 있다.3. Supports fixed in parabolic form in the reinforcing steel box of intermediate crossbeams at bends in which the direction of the external tension material changes, generate vertically distributed loads in the connecting beams of the crossbeams, and the friction between the crossbeams and the girders is relatively large. The vertical force of the crossbeam can be transmitted safely to the girders.
4. 연속화된 내부지점의 지점가로보에 지지구의 설치로 연속 PS 콘크리트 거더의 내부지점 부근의 부모멘트 구간에 긴장력의 도입이 가능하며, 연속화된 내부지점의 연속성을 강제적으로 제어할 수 있다.4. It is possible to introduce tension in the section of the parent near the inner point of the continuous PS concrete girder by forcing the support to the point of continuous inner point, and to control the continuity of the continuous inner point.
5. 거더 사이의 가로보에 외부긴장재가 정착 및 지지되므로 넓은 작업공간을 확보할 수 있다.5. External tension material is fixed and supported on the cross beam between girders to secure a wide working space.
6. 바닥판이 타설된 이후의 합성단면에 대한 긴장력의 도입이 가능하므로 사용 중에 보강의 목적으로 외부긴장력이 도입되는 경우에 바닥판의 철거와 교통량의 통제 등의 제한 없이 바로 외부긴장력을 도입할 수 있다.6. It is possible to introduce the tension force on the composite section after the bottom plate is poured, so when the external tension is introduced for the purpose of reinforcement during use, the external tension can be introduced immediately without restriction such as demolition of the bottom plate and control of traffic volume. have.

Claims (1)

  1. 본 공법은 거더와 가로보가 조립식으로 설치된 단순 또는 연속 PS 콘크리트 합성거더 교량에서 PS 콘크리트 거더 또는 합성거더에 외부긴장력을 도입하기 위한 것으로,This method is to introduce external tension to the PS concrete girder or composite girder in the simple or continuous PS concrete composite girder bridge prefabricated girders and cross beams,
    조립식 가로보의 연결부 보강 강상자에 고정된 상태에서 가로보에 매입되는 정착구(10) 및 지지구(14)에 외부긴장재가 정착 및 지지되며,The external tension member is fixed and supported in the fixing unit 10 and the supporter 14 that are embedded in the cross beams while being fixed to the reinforcement steel box of the prefabricated crossbeam.
    외부긴장재(20)의 정착구(10)는 정착단부 지점가로보(11)의 연결부 강상자(14)에 고정되고,The fixing unit 10 of the external tensioning material 20 is fixed to the connection box steel box 14 of the fixing end point gabor 11,
    외부긴장재(20)의 방향 변화를 위한 지지구(14)는 교축방향에 대한 높이 방향의 포물선 형태로 중간가로보(15)의 연결부 강상자(16) 또는 연속화 내부 지점가로보(17)의 연결부 강상자(19)에 고정되며,The support 14 for changing the direction of the external tension member 20 is a connection box of the connection box box 16 of the intermediate crossbeam 15 or the inner point of the continuum crossbeam 17 in the form of a parabola in the height direction with respect to the axial direction. Is fixed to 19,
    외부긴장재(20)에 의해 가로보에 도입된 긴장력은 정착단부에서 거더단부의 지압력에 의해 그리고 절곡부는 조립식 중간가로보(15)와 내부 지점가로보(17)의 가로보-거더 연결부 보강 강상자(16,18)의 연직방향 마찰연결에 의해 PS 콘크리트 거더 또는 합성거더에 전달되도록 한 공법The tension force introduced into the cross beam by the external tension member 20 is caused by the bearing pressure of the girder end at the fixing end, and the bent portion of the cross beam-girder connection reinforcement steel box 16 of the prefabricated intermediate crossbeam 15 and the inner point crossbeam 17. Method to transfer to PS concrete girder or composite girder by vertical friction connection
KR20040038811A 2004-05-31 2004-05-31 External prestressing method of ps concrete composite girder bridge by tendon anchored/supported to prefabricated cross beam KR100696646B1 (en)

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KR100680598B1 (en) * 2005-12-20 2007-02-08 한국건설기술연구원 Anchorage of a friction-pressure type and structure reinforcing method using the same
KR100785634B1 (en) * 2006-10-30 2007-12-12 장신찬 Continuation structure of prestressed concrete composite beam bridge and method thereof
KR100885663B1 (en) * 2008-05-09 2009-02-26 주식회사 오케이컨설턴트 A prestressed concrete composite girder using cross-beam and constructing method thereof
KR101135634B1 (en) * 2011-05-09 2012-04-17 김윤환 Rahmen bridge construction method using hinge joint in support parts and rigid joint in rahmen conner parts
CN110205943A (en) * 2019-06-29 2019-09-06 中国二十二冶集团有限公司 The construction method of prefabricated freely-supported small box girder end floor beam

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KR101632911B1 (en) * 2015-12-04 2016-06-23 (주)주신 Bridge using end prestressed beam and the construction method therewith

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KR100610739B1 (en) * 2004-02-12 2006-08-29 인하대학교 산학협력단 PS concrete girder fixing end reinforcement method using steel box
KR200390731Y1 (en) 2005-04-30 2005-07-25 주식회사 도우엔지니어즈 Precast prestressed concrete beam

Cited By (5)

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Publication number Priority date Publication date Assignee Title
KR100680598B1 (en) * 2005-12-20 2007-02-08 한국건설기술연구원 Anchorage of a friction-pressure type and structure reinforcing method using the same
KR100785634B1 (en) * 2006-10-30 2007-12-12 장신찬 Continuation structure of prestressed concrete composite beam bridge and method thereof
KR100885663B1 (en) * 2008-05-09 2009-02-26 주식회사 오케이컨설턴트 A prestressed concrete composite girder using cross-beam and constructing method thereof
KR101135634B1 (en) * 2011-05-09 2012-04-17 김윤환 Rahmen bridge construction method using hinge joint in support parts and rigid joint in rahmen conner parts
CN110205943A (en) * 2019-06-29 2019-09-06 中国二十二冶集团有限公司 The construction method of prefabricated freely-supported small box girder end floor beam

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