EP0293781A1 - Plaque d'accrochage et de mise en tension de renforcements métalliques dans la fabrication de traverses de chemin de fer en béton avec renforcements précontraints - Google Patents

Plaque d'accrochage et de mise en tension de renforcements métalliques dans la fabrication de traverses de chemin de fer en béton avec renforcements précontraints Download PDF

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Publication number
EP0293781A1
EP0293781A1 EP88108507A EP88108507A EP0293781A1 EP 0293781 A1 EP0293781 A1 EP 0293781A1 EP 88108507 A EP88108507 A EP 88108507A EP 88108507 A EP88108507 A EP 88108507A EP 0293781 A1 EP0293781 A1 EP 0293781A1
Authority
EP
European Patent Office
Prior art keywords
tensioning
plate
anchorage
holes
bars
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.)
Granted
Application number
EP88108507A
Other languages
German (de)
English (en)
Other versions
EP0293781B1 (fr
Inventor
Dr.-Ing. Amilcare Molin Zan
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.)
S C A C Cementi Armati Centrifugati SpA Soc
Original Assignee
S C A C Cementi Armati Centrifugati SpA Soc
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 S C A C Cementi Armati Centrifugati SpA Soc filed Critical S C A C Cementi Armati Centrifugati SpA Soc
Priority to AT88108507T priority Critical patent/ATE63495T1/de
Publication of EP0293781A1 publication Critical patent/EP0293781A1/fr
Application granted granted Critical
Publication of EP0293781B1 publication Critical patent/EP0293781B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/08—Members specially adapted to be used in prestressed constructions
    • E04C5/12—Anchoring devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
    • B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
    • B28B23/04—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed
    • B28B23/043—Wire anchoring or tensioning means for the reinforcements
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B3/00—Transverse or longitudinal sleepers; Other means resting directly on the ballastway for supporting rails
    • E01B3/28—Transverse or longitudinal sleepers; Other means resting directly on the ballastway for supporting rails made from concrete or from natural or artificial stone
    • E01B3/32—Transverse or longitudinal sleepers; Other means resting directly on the ballastway for supporting rails made from concrete or from natural or artificial stone with armouring or reinforcement
    • E01B3/34—Transverse or longitudinal sleepers; Other means resting directly on the ballastway for supporting rails made from concrete or from natural or artificial stone with armouring or reinforcement with pre-tensioned armouring or reinforcement

Definitions

  • the harmonic steel bars forming the reinforcement for the sleepers are anchored by means of plates comprising holes and seats, to which each single pair of bars stays anchored by means of a head formed by cold upsetting at the end of each bar.
  • the bars are then tensioned to the desired extent, before casting is performed, moving the plates by drawing with a bolt comprising a screw external to the plates, which bolt crosses said plates through an appropriate central hole thereof and is screwed to a nut internal to the plates and bearing thereon.
  • the nuts of the bolts for drawing the plates and thus the reinforcement bars of the sleeper remain each time englobed into the casting and thus into the sleepers when the forms are being dismantled, with a waste of material involving a certain expense; furthermore, the anchor plates for the reinforcement bars are likely to undergo, during drawing, even considerable wobbling which causes the bars to leave their ideal position, away from the plane provided therefor, up to taking unacceptable positions: this requires tools and inspections to check said position, involving considerable costs and waste of time.
  • the present invention concerns a plate for the anchorage and tensioning of the reinforcement bars for prestressed reinforced concrete railway sleepers, which allows to avoid these drawbacks and which provi­des furthermore important improvements and advantages in respect of known technique.
  • Said plate is substantially characterized in that it comprises, in a single piece obtained by hot-pressing of standard steel, two pairs of holes and anchorage seats for the harmonic steel bars positioned on one of the two reinforcement planes of the sleepers, and a pair of threaded holes into which screw two tensioning screws for the tensioning of said bars.
  • Said plate is suitably formed of two thicker elongated lateral portions housing said holes and seats, which are centrally connected by an easily deformable staple of reduced thickness.
  • the plate according to the invention - obtained in a single piece by pressing of standard steel - ­comprises two substantially oval elongated lateral portions 1 and 2, centrally connected by a rectangular staple 3.
  • the lateral plate portions 1 and 2 house pairs of holes 4, meant to be crossed by the ends of the reinforcement bars for the sleepers being constructed, said holes 4 forming seats 5 onto which bear the heads - ­formed by cold upsetting - of said bars. Between the holes 4, said portions 1 and 2 comprise larger threaded holes 6 for the tensioning screws.
  • the lateral portions 1 and 2 are thicker than the connecting staple 3 and their central part surrounding the holes 6 is even thicker.
  • a plate as that illustrated allows to anchor and tension all four bars of one of the two reinforcement planes of the sleeper to be cast, using a pair of tensioning screws screwed into the threaded holes 6 and tensioned by means of two identical coupled jacks.
  • the remarkable width of said plate prevents any undesired wobbling thereof (even when the form is being dismantled) and maintains a perfect lie (or anyhow within very strict tolerance limits) of the reinforcement bars on their planes.
  • the plate according to the invention thus eliminates all the most serious drawbacks of previous technique. It also guarantees an improved prestress diffusion in the concrete at the heads of the sleeper. Furthermore, the absence of sharp edges in the geometrical configuration of the sleeper prevents any undesired notching effects in the concrete.
  • the presence, in the structure of the plates, of the staple 3 of reduced thickness - far more deformable than the rest of the structures - allows the permanent absorption of any elongation differen­ces in the reinforcement bars, which may always arise during the tensioning operations (even if these are carried out with a strictly uniform law, under an even pull of identical jacks).
  • the plate takes up a Z-configuration which helps to absorb the differences in behaviour of the bars, allowing the two tensioning screws to obtain the same tensions in the four bars, independently of any errors in the mounting, or differences in length, of the bars employed.
  • the increased thickness of the plate in correspondence of the holes 6 finally allows to dispose of quite a long threading, so as to guarantee the positive holding of the screwing engagement between the tensioning screws and said plate even under highest stress, though using for the plate low cost materials, as standard steel, and without having to provide for any special treatments in correspondence of the actual threading.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Body Structure For Vehicles (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Rod-Shaped Construction Members (AREA)
  • Laminated Bodies (AREA)
  • Road Paving Structures (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
EP88108507A 1987-06-01 1988-05-27 Plaque d'accrochage et de mise en tension de renforcements métalliques dans la fabrication de traverses de chemin de fer en béton avec renforcements précontraints Expired - Lifetime EP0293781B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88108507T ATE63495T1 (de) 1987-06-01 1988-05-27 Verankerungs- und spannplatte fuer metallbewehrungen zum herstellen von vorgespannten stahlbetoneisenbahnschwellen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8721699U IT210288Z2 (it) 1987-06-01 1987-06-01 Piastrina per l'ancoraggio e la messa in tensione delle armature metalliche nella fabbricazione di traverse ferroviarie in cemento armato precompresso.
IT2169987U 1987-06-01

Publications (2)

Publication Number Publication Date
EP0293781A1 true EP0293781A1 (fr) 1988-12-07
EP0293781B1 EP0293781B1 (fr) 1991-05-15

Family

ID=11185586

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88108507A Expired - Lifetime EP0293781B1 (fr) 1987-06-01 1988-05-27 Plaque d'accrochage et de mise en tension de renforcements métalliques dans la fabrication de traverses de chemin de fer en béton avec renforcements précontraints

Country Status (5)

Country Link
EP (1) EP0293781B1 (fr)
AT (1) ATE63495T1 (fr)
DE (1) DE3862808D1 (fr)
ES (1) ES2022530B3 (fr)
IT (1) IT210288Z2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2685364A1 (fr) * 1991-12-18 1993-06-25 Vagneux Traverses Beton Arme S Selle et traverse de voie ferree; appareils de voie ferree les comportant.
EP4053334A1 (fr) * 2021-03-01 2022-09-07 P-TEC Holding GmbH Traverse de chemin de fer
CN115157436A (zh) * 2022-06-24 2022-10-11 山西路桥第八工程有限公司 一种预制桩的张拉装置及张拉工艺

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
MX2014008112A (es) 2014-07-01 2016-01-01 Bienracon S De Rl De Cv Durmiente monolítico ultrarresistente de concreto presforzado de forma integral con geometría óptima para vías férreas balastradas.

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE450406A (fr) *
GB633245A (en) * 1948-02-05 1949-12-12 Dudley Hepburn Stent Improvements relating to pre-stressed concrete
GB657794A (en) * 1949-02-04 1951-09-26 Mini Of Works Improvements relating to wire tensioning apparatus
US2689999A (en) * 1950-05-26 1954-09-28 Concrete Products Co Apparatus for manufacturing prestressed concrete structural units
DE1047695B (de) * 1958-02-10 1958-12-24 Franz Bock Dipl Ing Vorrichtung zum Herstellen von vorgespannten Betonbauteilen
CH376634A (de) * 1960-01-09 1964-04-15 Hunziker & Cie Ag Spanngliedverankerung für vorgespannte Betonkonstruktionen
US3568274A (en) * 1968-04-16 1971-03-09 Little Inc A Apparatus for making prestressed concrete members
US3577613A (en) * 1968-04-16 1971-05-04 Little Inc A Portable molding apparatus
US3985482A (en) * 1974-06-11 1976-10-12 Nihon Kogen Concrete Kabushiki Kaisha Device for producing prestressed concrete member

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE450406A (fr) *
GB633245A (en) * 1948-02-05 1949-12-12 Dudley Hepburn Stent Improvements relating to pre-stressed concrete
GB657794A (en) * 1949-02-04 1951-09-26 Mini Of Works Improvements relating to wire tensioning apparatus
US2689999A (en) * 1950-05-26 1954-09-28 Concrete Products Co Apparatus for manufacturing prestressed concrete structural units
DE1047695B (de) * 1958-02-10 1958-12-24 Franz Bock Dipl Ing Vorrichtung zum Herstellen von vorgespannten Betonbauteilen
CH376634A (de) * 1960-01-09 1964-04-15 Hunziker & Cie Ag Spanngliedverankerung für vorgespannte Betonkonstruktionen
US3568274A (en) * 1968-04-16 1971-03-09 Little Inc A Apparatus for making prestressed concrete members
US3577613A (en) * 1968-04-16 1971-05-04 Little Inc A Portable molding apparatus
US3985482A (en) * 1974-06-11 1976-10-12 Nihon Kogen Concrete Kabushiki Kaisha Device for producing prestressed concrete member

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2685364A1 (fr) * 1991-12-18 1993-06-25 Vagneux Traverses Beton Arme S Selle et traverse de voie ferree; appareils de voie ferree les comportant.
EP4053334A1 (fr) * 2021-03-01 2022-09-07 P-TEC Holding GmbH Traverse de chemin de fer
CN115157436A (zh) * 2022-06-24 2022-10-11 山西路桥第八工程有限公司 一种预制桩的张拉装置及张拉工艺
CN115157436B (zh) * 2022-06-24 2023-07-18 山西路桥第八工程有限公司 一种预制桩的张拉装置及张拉工艺

Also Published As

Publication number Publication date
ATE63495T1 (de) 1991-06-15
IT8721699V0 (it) 1987-06-01
DE3862808D1 (de) 1991-06-20
ES2022530B3 (es) 1991-12-01
EP0293781B1 (fr) 1991-05-15
IT210288Z2 (it) 1988-12-06

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