EP0824167A1 - Verfahren um vorgespannte betonstrukturen zu reparieren und bewehren - Google Patents

Verfahren um vorgespannte betonstrukturen zu reparieren und bewehren Download PDF

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Publication number
EP0824167A1
EP0824167A1 EP97905420A EP97905420A EP0824167A1 EP 0824167 A1 EP0824167 A1 EP 0824167A1 EP 97905420 A EP97905420 A EP 97905420A EP 97905420 A EP97905420 A EP 97905420A EP 0824167 A1 EP0824167 A1 EP 0824167A1
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EP
European Patent Office
Prior art keywords
reinforcing
tension member
concrete structure
sheet
repairing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP97905420A
Other languages
English (en)
French (fr)
Other versions
EP0824167A4 (de
Inventor
Shinzo Corporation Hork YAMADA
Tsuneo P.S Corporation OZAWA
Masahiko Tonen Corporation UEMURA
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CORP HORK
Corporation Hork
PRESTRESSED CONCRETE CONSTRUCT
Prestressed Concrete Constructors Association
Tonen General Sekiyu KK
Original Assignee
CORP HORK
Corporation Hork
PRESTRESSED CONCRETE CONSTRUCT
Prestressed Concrete Constructors Association
Tonen Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CORP HORK, Corporation Hork, PRESTRESSED CONCRETE CONSTRUCT, Prestressed Concrete Constructors Association, Tonen Corp filed Critical CORP HORK
Publication of EP0824167A1 publication Critical patent/EP0824167A1/de
Publication of EP0824167A4 publication Critical patent/EP0824167A4/de
Withdrawn legal-status Critical Current

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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
    • E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges

Definitions

  • the present invention relates to a method of repairing and reinforcing prestressed concrete structure which is applied prestress by a tension member such as PC steel (prestressed concrete steel), and more particularly to a method of repairing and reinforcing prestressed concrete structure in order to prevent the tension member from protruding unexpectedly from the structure as a result of rupture of the tension member such as PC steel.
  • a tension member such as PC steel (prestressed concrete steel)
  • a bridge beam having prestressed concrete structure which is tensioned by PC steel has generally a structure as illustrated in FIG. 9.
  • a reference numeral 10 represents a pavement applied on the floor slabs 3a
  • a reference numeral 12 represents a curb provided by casting on outer edges of the floor slabs 3a as a cover to cover an ends of the tension member 7.
  • a reference numeral 14 represents a cross beam covering made of concrete provided by casting on both sides the intermediate cross beam as a cover to cover an end of the tension member 7.
  • the tension member 7 to which a tension force has been applied destroys the curb 12 and the cross beam covering 14, and then protrudes outwardly away from the concrete structure by an energy effected by abruptly releasing the tension member from the tensioned state. This protrusion of the tension member 7 is accompanied with an explosion.
  • the present invention has been made in consideration of the above conventional state. It is an object of the present invention to provide a method of repairing and reinforcing prestressed concrete structure in order to prevent the tension member from protruding unexpectedly away from the prestressed concrete structure.
  • such object of the present invention is accomplished by securing a reinforcing sheet 16 to an end of the tension member 7 or to a surface of a covering for the end of the tension member 7.
  • the reinforcing sheet 16 When the reinforcing sheet 16 is secured to the end of the tension member 7 or the surface of the covering for the end of the tension member 7 as described above, the reinforcing sheet 16 absorbs an impact which is accompanied with an energy which is released as a result of the rupture of the tension member 7 (hereinafter referred to releasing energy), thereby preventing the tension member from protruding the outside.
  • the tension member 7 has the covering on the end thereof, broken pieces are generated due to the rupture of the tension member 7.
  • the securing of the reinforcing sheet 16 also prevents the broken pieces from scattering outside.
  • the tension member is of a relatively elongated shape, or of a thicker shape
  • the releasing energy accompanied with the rupture of the tension member 7 becomes larger than that in a usual case.
  • an auxiliary steel plate 19 is secured to the end of the tension member 7 or to the surface of the covering for the end of the tension member 7, and the reinforcing sheet 16 is secured to the auxiliary steel plate 19.
  • the releasing energy accompanied with the rupture of the tension member comprises an impact destruction energy and kinetic energy effected by an initial impact.
  • the auxiliary steel plate made of metal has an excellent shearing strength and is suitable for the absorption of the impact destruction energy.
  • the reinforcing sheet 16 adapted for being secured on the auxiliary steel plate 19 is made of a material with an excellent tensile strength, the absorption rate of kinetic energy increases.
  • Such combination of the reinforcing sheet 16 and the auxiliary steel plate 19 can effectively cope with the prevention of the protrusion of the tension member 7 with a relatively high releasing energy.
  • the reinforcing sheets 16 of different materials 16 are preferably constructed by a sheet of reinforced fiber with an excellent tensile strength and a sheet of reinforced fiber with an excellent shearing strength.
  • a sheet which is made of the reinforced fiber with an excellent shearing strength such as organic fiber including glass fiber, alamido fiber and polyolefine fiber, is impregnated and hardened with resin, and is secured, such sheet is suitable for the absorption of the impact destruction energy.
  • the protrusion of the tension member 7 with a higher releasing energy can effectively be prevented by securing plural sheets, which are respectively made from reinforced fibers of those different types.
  • the reinforcing sheet 16 is made of a sheet, in which fabric, non woven fabric, prepreg sheet, or reinforced fiber is secured to a supporting member 17.
  • the reinforcing sheet 16 is made of fabric, non woven fabric, prepreg sheet or reinforced fiber as described above, it is possible to form the reinforcing sheet 16 with a strength of such a degree as to prevent the protrusion of the tension member 7. Further, the securing of these materials to the supporting member 17 increases the strength of the reinforcing sheet 16, and prevents scattering of the fibers.
  • the reinforcing sheet 16 is made of prepreg sheet
  • the sheet hardens at ordinary temperature or hardens with heat in accordance with the composition of the resin included therein.
  • the reinforcing sheet 16 is made of the reinforcing fibers forming one layer, in which the fibers are aligned in one direction, or the reinforcing fibers forming plural layers, in which the fibers are aligned in one direction or plural directions.
  • the sheet with the fibers aligned in different directions may have less amount of fibers as compared with the sheet with the fibers aligned in one direction.
  • the reinforcing sheet 16 is made of reinforcing fibers, and the amount of reinforcing fibers per unit area is designed to be between 100 g/m 2 and 600 g/m 2 .
  • the amount of the reinforcing fibers of the reinforcing sheet 16 is varied in accordance with the releasing energy when the tension member 7 has been ruptured.
  • the reinforcing sheet 16 having an extremely large amount of the reinforcing fibers per one sheet deteriorates the operation efficiency in securing the reinforcing sheet 16 and the impregnation property of the resin, and rises manufacturing cost and the like of the reinforcing sheet 16.
  • the amount of the reinforcing fibers is preferably in the range of 100g/m 2 to 600g/m 2 for the reinforcing sheet 16 with the reinforcing fibers aligned in one direction.
  • the reinforcing sheet 16 has an excellent impregnation property as compared with a cloth like sheet including one directional sheet and two directional sheet so that, even if the sheet having the reinforcing fibers of on or more than 600g/m 2 is used, it may not adversely affect the operation efficiency or the like.
  • thermosetting resin which is capable of hardening at ordinary temperature
  • the bonding agent can spontaneously harden after the application thereof, the prestressed concrete structure can be repaired and reinforced in an extremely simple manner.
  • a reinforcing steel plate 20 may be secured to an end of the tension member 7 or to a surface of a covering for the end of the tension member 7 in a method of repairing and reinforcing prestressed concrete structure which is applied prestress by a tension member 7 such as PC steel.
  • the following effect can be produced by securing the reinforcing steel plate 20 via a bolt.
  • FIG. 1 is a perspective view illustrating a reinforcing sheet used in the first embodiment of a method of repairing and reinforcing prestressed concrete structure in accordance with the present invention.
  • FIG. 2 is a perspective view of an essential portion with a partial cross section illustrating an executed state of the method of the first embodiment.
  • FIGS. 3 illustrate an auxiliary steel plate used in the third embodiment of the method of repairing and reinforcing prestressed concrete structure, in which FIG. 3(A) is a plan view, and FIG. 3(B) is a side dew.
  • FIG. 4 is a cross section of an essential portion illustrating an executed state of the method in accordance with the third embodiment.
  • FIG. 5 is a perspective view illustrating another structure of the auxiliary steel plate used in the method of the third embodiment.
  • FIG. 6 is a perspective view illustrating a reinforcing steel plate used in the method in accordance with the fourth embodiment.
  • FIG. 7 is a front view of an essential portion illustrating an executed state of the method in accordance with the fourth embodiment.
  • FIG. 8 is a cross section of an essential portion illustrating a state that a tension member has been ruptured after the method of the fourth embodiment was executed.
  • FIG. 9 is a perspective view with a partial cross section illustrating a conventional prestressed concrete structure.
  • the first embodiment relates to a method, in which a reinforcing sheet is secured.
  • a reference numeral 16 represents a reinforcing sheet where unmeasured numbers of carbon fibers 18 as reinforcing fibers are aligned in one direction and in a plurality of layers on one surface of a supporting member 17.
  • the reinforcing sheet 16 is designed so that its amount of carbon fibers per unit area is 200 g/m 2 , and tensile strength is 355 kg/mm 2 .
  • This supporting member 17 is not necessary to limit the supporting member 17 to a meshed shape, and it may be formed into a sheet. This supporting member 17 is provided to increase the strength of the reinforcing sheet 16 and prevent carbon fibers from scattering.
  • the reinforcing sheet 16 is secured to a surface of a curb 12 of prestressed concrete structure 1 in such a manner as to cover an end of a tension member 7 which is made of PC steel.
  • primer is applied to a top surface 12a, a side surface 12b and a bottom surface 12c of the curb 12 to secure the adhering strength of resin.
  • thermosetting resin such as epoxy resin, which hardens at ordinary temperature, is applied as a bonding agent.
  • the reinforcing sheet 16 is then secured and a resin for finishing is applied thereon.
  • a second reinforcing sheet 16 is then secured in the same manner as the above.
  • This reinforcing sheet 16 forming a second layer is secured in such a manner as to have carbon fibers thereof being substantially perpendicular to those of the reinforcing sheet 16 forming a first layer.
  • the reinforcing sheet itself is not torn, but it is peeled off and moved outward with a portion pressed by the tension member as a center.
  • broken pieces of the curb 12 accompanied by the rupture of the tension member 7 are confined between the reinforcing sheet 16 and the curb 12 so that they are unlikely to scatter outside.
  • the tension member 7 can also effectively act as reinforcement for concrete structure, even if the tension member 7 is not ruptured.
  • reinforcing sheet 16 is secured to a cross beam covering 14 in the same manner as the above.
  • a predetermined tension force a ton of 26.9 lbs.
  • the testing objects are as follows:
  • the reinforcing sheets 16 were moved outward with a portion hit by the tension member 7 as a center in the area of 250 mm in the direction of the beam length A and 100 mm in the direction of the side surface height C.
  • the reinforcing sheets 16 were torn with a portion hit by the tension member 7 as a center in the area of 350 mm in the direction of the beam length A, but the tension member 7 did not protrude outside.
  • the reinforcing sheets 16 were slightly moved outward with a portion hit by the tension member 7 as a center in the area of 100 mm in the direction of the side surface height C.
  • a material of the reinforcing sheet 16 is not necessarily limited to carbon fibers as described in the first embodiment.
  • the reinforcing sheet 16 may be made from glass fibers or alamido fibers used in the test. Instead, the reinforcing sheet 16 may be made from reinforcing fibers of organic fibers such as polyarylate fibers and polyolefine fibers.
  • the reinforcing sheet 16 may be made from more than two types of fibers which are optionally selected from three types of the reinforcing fibers including carbon fibers, glass fibers and organic fibers. Further, the reinforcing sheet 16 may be made of fabric, non woven fabric, prepreg sheet or the like. It is essential that the reinforcing sheet 16 can be secured to the structure via a means such as a bonding agent, and is made of a material having the strength of such a degree as to prevent the protrusion of the tension member 7.
  • the amount of the reinforcing fibers, tensile strength and the like are not necessarily limited to the examples for carbon fibers and glass fibers as mentioned above, and can properly be varied.
  • the amount of the reinforcing fibers is preferably in the range of 100 g/m 2 to 600 g/m 2
  • tensile strength is preferably in the range of 100 kg/mm 2 to 1,000 kg/mm 2 .
  • the reinforcing sheet 16 is constructed so that reinforcing fibers are aligned in one direction and in a plurality of layers.
  • the reinforcing sheet 16 may be made of a sheet with one layer of reinforcing fibers aligned in one direction, or a sheet with plural layers of reinforcing fibers which is made by layering plural groups of the reinforcing fibers aligned in a predetermined direction so that the reinforcing fibers are aligned in different directions in a plurality of layers.
  • the reinforcing sheet 16 may be arranged in one layer provided that it can prevent the protrusion of the tension member 7. It is a matter of course that more than the reinforcing sheets 16 may be arranged in more than two layers.
  • two reinforcing sheets 16 are secured so that the fibers of one reinforcing sheet extend in the substantially perpendicular direction to those of another reinforcing sheet 16.
  • two or more reinforcing sheets 16 may be secured so that the fibers extend in the same direction.
  • the quality, construction, amount of fibers, strength, securing area, and the like of the reinforcing sheet 16 may properly be varied in accordance with the scale of the structure, diameter and length of the tension member 7, manufacturing cost, executing cost, and the like.
  • the reinforcing sheet 16 which can do no less than prevent the protrusion of the tension member 7, is properly selected in accordance with a surrounding condition.
  • the reinforcing sheet 16 which can display a phenomenon such as the outward movement thereof at the time of the rupture of the tension member 7 is preferable, since it is possible to confirm from the outside whether there is the rupture of the tension member 7.
  • the rupture of the reinforcing sheet 16 can be confirmed via visual observation in accordance with the degree of such outward movement, once the reinforcing sheet 16 has been moved outward.
  • the second embodiment relates to a method, in which the reinforcing sheets of different materials are secured in a plurality of layers.
  • the reinforcing sheet 16 with alamido fibers aligned in one direction is secured to the surface of the curb 12 of the prestressed concrete structure 1 in such a manner as to cover an end of the tension member 7 in the same execution method as that in the first embodiment.
  • the reinforcing sheet 16 with carbon fibers aligned in one direction is, then, secured to the reinforcing sheet of alamido fibers so that the reinforcing sheet 16 of alamido fibers is covered therewith, in which the carbon fibers are aligned in a substantially perpendicular direction to that of the alamido fibers.
  • the reinforcing sheet 16 of alamido fibers which has been impregnated to the resin and hardened, has an excellent shearing strength and is suitable for absorbing impact destruction energy.
  • the reinforcing sheet 16 of carbon fibers which has been impregnated to the resin and hardened, has an excellent tensile strength and is suitable for absorbing kinetic energy.
  • the advantages of the respective fibers are obtainable at the same time. Thereby, it is possible to prevent the protrusion of the tension member 7 with a higher energy, as compared with the arrangement that the reinforcing sheets 16 of a uniform material are superimposed to each other and secured.
  • two reinforcing sheets 16 each having alamido fibers aligned in one direction are secured to the surface of the curb 12 of the prestressed concrete structure 1 one by one in such a manner as to cover an end of the tension member 7 by the same execution method as in the first embodiment, and direct alamido fibers of one reinforcing sheet 16 in the substantially perpendicular direction to those of another reinforcing sheet 16.
  • Two reinforcing sheets 16 each having carbon fibers aligned in one direction are, then, secured one by one on the reinforcing sheet 16 of alamido fibers so that carbon fibers of one reinforcing sheet 16 extend in the substantially perpendicular direction to those of another reinforcing sheet 16.
  • the reinforcing sheets 16 were moved outward with a portion hit by the tension member 7 as a center in the area of 200 mm in the direction of the beam length A and 100 mm in the direction of the side surface height C.
  • the third embodiment relates to a method, in which an auxiliary steel plate and the reinforcing sheet are secured.
  • a reference numeral 19 represents an auxiliary steel plate which is formed into a disk shape with a peripheral edge 19a which is rounded by taper-cutting.
  • the auxiliary steel plate 19 with a thickness of 3.2 mm is used.
  • the material, structure, numbers and the like of the reinforcing sheets 16 to be secured are selected from those described in the first and second embodiments.
  • the auxiliary steel plate 19 is secured via a bonding agent to a surface of the curb 12 of the structure 1, which surface lies on an extension line of the tension member 7.
  • a difference in level generated in the surface of the curb 12 by the reinforcing steel plate 19 is, then, leveled by using epoxy resin 23 or the like.
  • the reinforcing sheet 16 is then secured in a proper manner. In this regard, it is preferable to take the following points into consideration.
  • the reinforcing sheet 16 is likely to be peeled off from the surface of the curb 12 by kinetic energy produced at the time of the rupture of the tension member 7, with the result that the reinforcing sheet 16 cannot sufficiently display its tensile force.
  • the auxiliary steel plate 19 having an excellent shearing strength is suitable for absorbing impact destruction energy.
  • the use of the reinforcing sheet 16 of a material having a relatively excellent tensile force can effectively cope with the repairing and reinforcing of the structure, in which the releasing energy accompanied by the rupture of the tension member 7 is higher than that in a usual case, for example, the structure with a lengthy tension member 7 and being subjected to a larger tension force,
  • auxiliary steel plate 19 secured via the bonding agent is moved outward by the protrusion of the tension member 7 as a result of the rupture so that the presence of the rupture can be observed from the outside.
  • the auxiliary steel plate 19 of the third embodiment which has a diameter of 200 mm and the peripheral edge 19a which has a rounded shape formed by taper cutting, was secured via resin to the surface of the curb 12 of the prestressed concrete structure 1 in such a manner as to cover an end of the tension member 7 in the same manner as in the first embodiment.
  • Two reinforcing sheets 16 each having carbon fibers aligned in one direction were secured one by one to the auxiliary steel plate 19 so that carbon fibers of one reinforcing sheet 16 extend in the substantially perpendicular direction of those of another reinforcing sheet 16.
  • the reinforcing sheets 16 were moved outward with a portion hit by the tension member 7 as a center in the area of 250 mm in the direction of the beam length A and 250 mm in the direction of the side surface height C.
  • the auxiliary steel plate 19 having a disk shape was proposed as an example.
  • the auxiliary steel plate 19 may be of a rectangular shape or other shapes. It is essential to construct the auxiliary steel plate 19 from a plate like member with a suitable thickness.
  • the auxiliary steel plate with a thickness of 3.2 mm was proposed as an example.
  • a thicker auxiliary steel plate 19 is not always suitable for this application, since it is difficult to manufacture the auxiliary steel plate 19 in accordance with the shape of the structure to which the auxiliary steel plate 19 is secured, as the thickness increases. The welding operation or the like also becomes hard to be done. Further, the presence of the rupture can not be observed from the outside, since deformation of the auxiliary steel plate 19 does not occur at the time of the collision.
  • the thickness of the auxiliary steel plate 19 is preferably in the range of 0.1 mm to 10 mm.
  • the fourth embodiment relates to a method, in which only a reinforcing steel plate is secured.
  • a reference numeral 20 represents a reinforcing steel plate 20 which has an engaging portion 20a being formed into a substantially U shape and mounting portions 20b, 20b extending from the opposite ends of the engaging portion 20a to be engaged with the cross beam covering 14.
  • a pair of holes 21, 21 are formed in the respective mounting portion 20b, 20b.
  • the reinforcing steel plate 20 has a thickness of 6 mm.
  • the reinforcing steel plate 20 is engaged with the surface of the cross beam covering 14 of the prestressed concrete structure 1 in such a manner as to cover an end of the tension member 7.
  • Bolts 22 are respectively inserted into the holes of the mounting portions 20b to boltholes (not shown) formed in the main beam 3b.
  • Nuts 23 are respectively threadably secured to the tip portions of the bolts 22 protruding from the opposite side of the main beam 3b, thereby securing the reinforcing steel plate 20 to the main beam 3b.
  • the reinforcing steel plate 20 prevents the tension member 7 from protruding outside, thereby preventing large broken pieces of the tension member 7, the cross beam covering 14 or the like from falling.
  • the engaging portion 20a is curved outwardly to form a protruded portion.
  • a test beam of an actual size in which beam width D of the structure is 4,000 mm, a width E of the cross beam covering 14 is 200 mm, height of the beam 3 having a T shape in section is 1,000 mm, and diameter and length of the tension member 7 in the intermediate cross beam 8 are respectively 23 mm and 3,000 mm, was used.
  • the protruding state of the tension member 7, which was artificially ruptured, was observed for two types of the reinforcing steel plates 20 as a testing object which respectively have 6 mm and 12 mm in thickness, length H of 300 mm, width I of 460 mm, depth J of 85 mm at the engaging portion 20a.
  • the reinforcing steel plate 20 having a thickness of 6 mm in the fourth embodiment was determined based upon the test result. However, it is not necessary to limit the reinforcing steel plate 20 to a thickness of 6 mm, since the reinforcing steel plate having a thickness of 5 mm or 7 mm also produces the same effect as the effect produced by the reinforcing steel plate 20 with a thickness of 6 mm. In addition, even if the reinforcing steel plate 20 with a thickness of 12 mm is used, it is possible to obtain the effect that at least the protrusion of the tension member 7 can be prevented.
  • the thickness of the reinforcing steel plate 20 can be varied in accordance with the shape and scale of the structure, the length and diameter of the tension member 7, etc.
  • the thickness, area, material or the like of the reinforcing steel plate 20 in the fourth embodiment can properly be varied in accordance with the scale of the structure, the diameter of the tension member 7 or the like, since the reinforcing steel plate 20 with a thickness of, for example, 3 mm may prevent the tension member 7 from protruding the outside, and accomplish the confirmation of the presence of the rupture of the tension member 7 from the outside in accordance with the scale of the structure.
  • the thickness of the reinforcing steel plate 20 is preferably in the range of 1 mm to 15 mm.
  • reinforcing steel plate 20 each having a thickness of, for example, 3 mm can lay on top of the other to form the reinforcing steel plate 20 with a thickness of 6 mm, 9 mm or more.
  • the arrangement where the curb or the cross beam covering is provided is proposed in the respective embodiments.
  • the method of the present invention can be carried out for a portion where an end of the tension member 7 is exposed to the outside without the curb or the cross beam covering.
  • the auxiliary steel plate 19 is formed by one plate.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Working Measures On Existing Buildindgs (AREA)
  • Bridges Or Land Bridges (AREA)
  • Reinforcement Elements For Buildings (AREA)
EP97905420A 1996-02-29 1997-02-27 Verfahren um vorgespannte betonstrukturen zu reparieren und bewehren Withdrawn EP0824167A4 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP8043904A JP2742675B2 (ja) 1996-02-29 1996-02-29 プレストレストコンクリート構造物の補修補強方法
JP43904/96 1996-02-29
PCT/JP1997/000599 WO1997032084A1 (fr) 1996-02-29 1997-02-27 Procede de reparation et de renfort de structures en beton precontraint

Publications (2)

Publication Number Publication Date
EP0824167A1 true EP0824167A1 (de) 1998-02-18
EP0824167A4 EP0824167A4 (de) 2000-07-19

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EP97905420A Withdrawn EP0824167A4 (de) 1996-02-29 1997-02-27 Verfahren um vorgespannte betonstrukturen zu reparieren und bewehren

Country Status (5)

Country Link
EP (1) EP0824167A4 (de)
JP (1) JP2742675B2 (de)
KR (1) KR19990008037A (de)
TW (1) TW318200B (de)
WO (1) WO1997032084A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2839090A1 (fr) * 2002-04-29 2003-10-31 Nantes Ecole Centrale Procede de protection d'ouvrages d'art ou autres comprenant des cables tendus de precontrainte exterieure et/ou des cables porteurs et/ou des tirants
CN103243662A (zh) * 2013-05-28 2013-08-14 中铁上海设计院集团有限公司 一种既有铁路桥梁的改造加固方法

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US6250030B1 (en) * 1997-12-02 2001-06-26 Teijin Limited Prestressed concrete structure, reinforcing member used for the prestressed concrete molded articles, and sheet member used for the reinforcing member
KR100451903B1 (ko) * 2001-04-27 2004-10-08 김장호 프리스트레스트 콘크리트 휨부재의 보수·보강방법
KR100432494B1 (ko) * 2001-09-07 2004-05-22 (주)스틸엔콘크리트 광폭의 ｐ.ｃ 거더 블록과, 이것을 이용한 교량의시공방법
KR20030028225A (ko) * 2001-09-27 2003-04-08 (주)신성엔지니어링 크로스 빔용 프리캐스트 콘크리트 블록을 이용한프리스트레스트 콘크리트 빔 교량의 시공방법
JP4262084B2 (ja) * 2003-12-26 2009-05-13 株式会社ピーエス三菱 プレグラウトｐｃ鋼より線の被覆撤去方法
JP6179978B2 (ja) * 2013-05-27 2017-08-16 三井住友建設株式会社 横締めｐｃ鋼棒突出防護工法
CN103321430B (zh) * 2013-06-07 2015-08-12 华北水利水电大学 预应力碳纤维片材加固大跨混凝土结构的施工方法
CN104568007A (zh) * 2015-01-14 2015-04-29 中央民族大学 一种安全监测系统及方法
JP7317663B2 (ja) * 2019-10-24 2023-07-31 西日本高速道路株式会社 プレキャストｐｃ床版
CN114808765A (zh) * 2022-05-09 2022-07-29 中铁城建集团第三工程有限公司 既有铁路桥简支双t梁横向加固施工工法

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EP0378232A1 (de) * 1989-01-12 1990-07-18 Mitsubishi Kasei Corporation Verfahren zur Verstärkung von Betonstrukturen

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2839090A1 (fr) * 2002-04-29 2003-10-31 Nantes Ecole Centrale Procede de protection d'ouvrages d'art ou autres comprenant des cables tendus de precontrainte exterieure et/ou des cables porteurs et/ou des tirants
WO2003093581A1 (fr) * 2002-04-29 2003-11-13 Ecole Centrale De Nantes Procede de protection d'ouvrages d'art avec cables de precontrainte
US7992357B2 (en) 2002-04-29 2011-08-09 Ecole Centrale De Nantes Safety device for use with prestressing cables
CN103243662A (zh) * 2013-05-28 2013-08-14 中铁上海设计院集团有限公司 一种既有铁路桥梁的改造加固方法

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WO1997032084A1 (fr) 1997-09-04
TW318200B (de) 1997-10-21
KR19990008037A (ko) 1999-01-25
JP2742675B2 (ja) 1998-04-22
JPH09235827A (ja) 1997-09-09
EP0824167A4 (de) 2000-07-19

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