EP0624697B1 - Stressed steel reinforcement for prestressed concrete sleepers with grouted anchoring - Google Patents

Stressed steel reinforcement for prestressed concrete sleepers with grouted anchoring Download PDF

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Publication number
EP0624697B1
EP0624697B1 EP94103556A EP94103556A EP0624697B1 EP 0624697 B1 EP0624697 B1 EP 0624697B1 EP 94103556 A EP94103556 A EP 94103556A EP 94103556 A EP94103556 A EP 94103556A EP 0624697 B1 EP0624697 B1 EP 0624697B1
Authority
EP
European Patent Office
Prior art keywords
steel reinforcement
prestressed concrete
anchoring
concrete sleepers
grouted
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.)
Expired - Lifetime
Application number
EP94103556A
Other languages
German (de)
French (fr)
Other versions
EP0624697A1 (en
Inventor
Frithjof Dipl.-Ing. Schimpff
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.)
Pfleiderer Infrastrukturtechnick GmbH and Co KG
Original Assignee
Pfleiderer Infrastrukturtechnick GmbH and Co KG
Pfleiderer Verkehrstechnik GmbH and Co KG
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 Pfleiderer Infrastrukturtechnick GmbH and Co KG, Pfleiderer Verkehrstechnik GmbH and Co KG filed Critical Pfleiderer Infrastrukturtechnick GmbH and Co KG
Publication of EP0624697A1 publication Critical patent/EP0624697A1/en
Application granted granted Critical
Publication of EP0624697B1 publication Critical patent/EP0624697B1/en
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
    • 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
    • B28B23/046—Post treatment to obtain pre-stressed articles
    • 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
    • B28B23/06—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 for the production of elongated articles
    • 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
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/28—Cores; Mandrels
    • B28B7/30—Cores; Mandrels adjustable, collapsible, or expanding
    • B28B7/303—Cores; Mandrels adjustable, collapsible, or expanding specially for making undercut recesses or continuous cavities the inner section of which is superior to the section of either of the mouths
    • 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
    • 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
    • E04C3/20—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members
    • E04C3/26—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members prestressed
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
    • E04C5/02—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance
    • E04C5/03—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance with indentations, projections, ribs, or the like, for augmenting the adherence to the concrete
    • 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
    • E04C5/10—Ducts

Definitions

  • the invention relates to a prestressed concrete threshold, as in The preamble of claim 1 is described.
  • the thresholds from economic and manufacturing reasons with two crosswise installed hairpin-shaped curved rods. This means that complex anchoring constructions fall on one End of the finished part gone. You will be there by the Rod arch replaced.
  • One with a hairpin bent Tension bars reinforced threshold is for example from DE A 10 58 909 known
  • the prestressing rods - because of the small cross-section of the sleepers - with one very small bending radius.
  • the small Bending radius limits the number of prestressing steels that can be used on.
  • the object of the invention is suitable hairpin-shaped to find bendable reinforcing bars with which one sufficient liability is achievable.
  • the object is achieved by the characterizing part of the claim, especially through targeted initiation of a Manufacture of profiled tension bars with cross sections with diameters> 8 mm, with which a production of Prestressed concrete sleepers with subsequent composite under The use of profiled tie rods is only possible.
  • FIGS. 1 and 2 show a threshold in longitudinal section (Fig.1) and cross section (Fig.2) with cross-shaped hairpin-shaped reinforcing bars.
  • a prestressed concrete sleeper 1 is in the formwork with the help inserted suitable shaped bars with the concrete 2 penetrating tension channels 3 provided in the Hairpin-shaped tie rods 4 made of profiled prestressing steel pulled in after the concrete has hardened and then be excited. Then the tensioning channels with suitable grout.

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  • 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)
  • Reinforcement Elements For Buildings (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
  • Joining Of Building Structures In Genera (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
  • Rod-Shaped Construction Members (AREA)

Abstract

In order to avoid permanent cracks in the case of prestressed-concrete sleepers with post-tensioning which are subjected to high loading, it is proposed to use as stressing reinforcement, in place of the hitherto-used smooth hairpin-shaped stressing bars, those of profiled cold-drawn steel. <IMAGE>

Description

Die Erfindung betrifft eine Spannbetonschwelle, wie sie im Oberbegriff des Anspruchs 1 beschrieben ist. Zur Vorspannung von Spannbetonschwellen mit nachträglichem Verbund werden die Schwellen aus wirtschaftlichen und herstellungstechnischen Gründen mit zwei kreuzweise verlegten haarnadelförmig gebogenen Spannstäben armiert. Damit fallen aufwendige Verankerungskonstruktionen an einem Ende des Fertigteils weg. Sie werden dort durch den Stabbogen ersetzt. Eine mit haarnadelförmig gebogenen Spannstäben bewehrte Schwelle ist beispielsweise aus der DE A 10 58 909 bekanntThe invention relates to a prestressed concrete threshold, as in The preamble of claim 1 is described. For prestressing prestressed concrete sleepers with subsequent The thresholds from economic and manufacturing reasons with two crosswise installed hairpin-shaped curved rods. This means that complex anchoring constructions fall on one End of the finished part gone. You will be there by the Rod arch replaced. One with a hairpin bent Tension bars reinforced threshold is for example from DE A 10 58 909 known

Will man haarnadelförmig gebogene Spannstäbe in Spannbetonschwellen verwenden, so müssen die Spannstäbe - wegen des geringen Querschnitts der Schwellen - mit einem sehr kleinen Biegeradius gebogen werden. Der kleine Biegeradius schränkt die Zahl der verwendbaren Spannstähle ein.If you want hairpin bends in Use prestressed concrete sleepers, the prestressing rods - because of the small cross-section of the sleepers - with one very small bending radius. The small Bending radius limits the number of prestressing steels that can be used on.

Bisher waren nur glatte Spannstähle bekannt, die um den erforderlichen kleinen Biegeradius biegbar waren. Vergütete gewalzte gerippte Spannstähle eigneten sich für haarnadelförmige Bewehrung mit kleinem Biegeradius nicht. So far, only smooth prestressing steel was known, which around the required small bending radius were bendable. Compensated rolled ribbed prestressing steels were suitable for hairpin-shaped reinforcement with a small bending radius is not.

Sie geben die Umlenk- und Verankerungskräfte im wesentlichen punktweise über die Hochpunkte des Profils auf die Laibungsfläche des Betons ab und zerstören dabei den Beton. Außerdem besteht bei dem über Rollen mit zu kleinen Biegedurchmesser gebogenen Spannstab Sprödbruchgefahr, die die Tragfähigkeit des Fertigteils gefährdet.They give the deflection and anchoring forces in the essential points on the high points of the profile the reveal surface of the concrete and thereby destroy the Concrete. In addition, there is too small with roles Bending diameter bent tie rod risk of brittle fracture the load-bearing capacity of the precast element is endangered.

Eisenbahnschwellen sind durch Dauerschwingbeanspruchung hoch belastet. Mit Vorspannung mit nachträglichem Verbund hergestellte Schwellen weisen besonders hohe Betonfestigkeiten von über 60 N/mm2 auf, die zur Aufnahme der Lasten möglichst voll genutzt werden. Bei Schwellen auf Bahnhauptstrecken erreicht die Beanspruchung nahezu bei jeder Überfahrung die ihrer Bemessung zugrunde liegende Größtlast und am kritischen Querschnitt die maximale zulässige Zugspannung. Durch eine große Zugspannung entstehen Risse im Beton, die sich bei Entlastung nicht wieder vollständig schließen. Diese bleibenden Risse können zu dauernden Schäden und zur Zerstörung der Fertigteile führen (z.B. indem bei weiteren Lastwechseln von unten Partikel in den Riß einwandern und die Rißbreite fortschreitend vergrößern).Railway sleepers are subject to high levels of vibration. Thresholds manufactured with pre-tensioning with a subsequent bond have particularly high concrete strengths of over 60 N / mm 2 , which are used as fully as possible to absorb the loads. In the case of sleepers on main railway lines, the load reaches the maximum load on which the design is based and the maximum permissible tensile stress at the critical cross-section for almost every pass. A large tensile stress creates cracks in the concrete that do not close completely when relieved. These permanent cracks can lead to permanent damage and to the destruction of the finished parts (for example, if particles move into the crack from below and further increase the width of the crack).

Eingehende Untersuchungen der Anmelderin haben ergeben, daß die obengenannten Schäden durch eine verbesserte Haftung zwischen Beton und den Spannstäben beseitigt werden können. Diese verbesserte Haftung ist mit den üblich verwendeten glatten Spannstäben nicht erreichbar. Sie war nur durch Einsatz von Profilstäben möglich. Gerippte Spannstäbe aus vergütetem gewalzten Stahl schieden aus den oben genannten Gründen aus. Detailed investigations by the applicant have shown that the above damage through improved liability between concrete and the tie rods can be eliminated. This improved liability is common with that used smooth tension rods not accessible. It was just through Use of profile bars possible. Ribbed tie rods quenched and tempered rolled steel departed from the above Reasons for.

Aus der DE A 10 84 464 und der US PS 34 94 164 ist es auch bereits bekannt, kaltgezogene profilierete Spannstäbe herzustellen. Durch einen nachgeschalteten Walzgang wird die Mantelfläche der Stäbe mit muldenförmigen Vertiefungen versehen. Aus herstellungstechnischen Gründen wurden bislang nach diesem Verfahren, jedoch nur Drähte oder Stäbe mit einem für eine einfache vierstäbige Bewehrung von Gleisschwellen zu kleinen Querschnitt gefertigt.From DE A 10 84 464 and US PS 34 94 164 it is also already known, cold drawn profiled tie rods to manufacture. Through a downstream rolling mill the lateral surface of the rods with trough-shaped depressions Mistake. For manufacturing reasons So far this method, but only wires or rods with one for simple four-bar reinforcement by Track sleepers made to small cross-section.

Aufgabe der Erfindung ist es, geeignete haarnadelförmig biegbare Bewehrungsstäbe zu finden, mit denen eine ausreichende Haftung erreichbar ist.The object of the invention is suitable hairpin-shaped to find bendable reinforcing bars with which one sufficient liability is achievable.

Die Aufgabe wird gelöst, durch den kennzeichnenden Teil des Anspruchs, insbesondere durch gezielte Initiierung einer Fertigung von profilierten Spannstäben mit Querschnittten mit Durchmessern > 8 mm, mit denen eine Produktion von Spannbetonschwellen mit nachträglichem Verbund unter Verwendung von profilierten Spannstäben erst möglich wird.The object is achieved by the characterizing part of the claim, especially through targeted initiation of a Manufacture of profiled tension bars with cross sections with diameters> 8 mm, with which a production of Prestressed concrete sleepers with subsequent composite under The use of profiled tie rods is only possible.

Die Erfindung wird durch die Figur 1 und 2 erläutert. Figur 1 und 2 zeigen eine Schwelle im Längsschnitt (Fig.1) und Querschnitt (Fig.2) mit kreuzförmig verlegten haarnadelförmigen Bewehrungsstäben.The invention is illustrated by FIGS. 1 and 2. Figures 1 and 2 show a threshold in longitudinal section (Fig.1) and cross section (Fig.2) with cross-shaped hairpin-shaped reinforcing bars.

Eine Spannbetonschwelle 1 wird mit Hilfe in der Schalung eingelegter geeigneter Formstäbe mit den Beton 2 durchsetzenden Spannkanälen 3 versehen, in die haarnadelförmige Spannstäbe 4 aus profilierten Spannstahl nach Erhärtung des Betons eingezogen und anschließend gespannt werden. Anschließend werden die Spannkanäle mit geeignetem Verpreßmörtel verpreßt.A prestressed concrete sleeper 1 is in the formwork with the help inserted suitable shaped bars with the concrete 2 penetrating tension channels 3 provided in the Hairpin-shaped tie rods 4 made of profiled prestressing steel pulled in after the concrete has hardened and then be excited. Then the tensioning channels with suitable grout.

Claims (1)

  1. Prestressed concrete sleeper with prestressing with later bonding, in which a steel reinforcement consisting of two hairpin-shaped reinforcing rods laid crosswise is introduced into prefabricated channels after the hardening of the concrete and tensioned,
    characterised by the fact that reinforcing rods made of profiled cold drawn steel which are provided with trench-like depressions in their surface through a later rolling operation, are used for the steel reinforcement.
EP94103556A 1993-05-08 1994-03-09 Stressed steel reinforcement for prestressed concrete sleepers with grouted anchoring Expired - Lifetime EP0624697B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4315402 1993-05-08
DE4315402 1993-05-08

Publications (2)

Publication Number Publication Date
EP0624697A1 EP0624697A1 (en) 1994-11-17
EP0624697B1 true EP0624697B1 (en) 2000-07-19

Family

ID=6487606

Family Applications (2)

Application Number Title Priority Date Filing Date
EP93113953A Withdrawn EP0625414A1 (en) 1993-05-08 1993-09-01 Process for increasing the adhesion in prestressed concrete sleepers or similar products of improved fatigue strength with grouted anchoring and forming apparatus for carrying out the process
EP94103556A Expired - Lifetime EP0624697B1 (en) 1993-05-08 1994-03-09 Stressed steel reinforcement for prestressed concrete sleepers with grouted anchoring

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP93113953A Withdrawn EP0625414A1 (en) 1993-05-08 1993-09-01 Process for increasing the adhesion in prestressed concrete sleepers or similar products of improved fatigue strength with grouted anchoring and forming apparatus for carrying out the process

Country Status (5)

Country Link
EP (2) EP0625414A1 (en)
AT (1) ATE194862T1 (en)
DE (1) DE59409453D1 (en)
ES (2) ES1026242Y (en)
PT (1) PT624697E (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202018106169U1 (en) 2018-09-20 2018-11-08 Leonhard Moll Betonwerke Gmbh & Co Kg Device for stabilizing the front sides of precast concrete elements

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202009006555U1 (en) * 2009-05-07 2009-07-16 Rail.One Gmbh prestressed concrete sleeper
MX2014008112A (en) 2014-07-01 2016-01-01 Bienracon S De Rl De Cv Ultra resistant monolithic railroad ties made of reinforced concrete in an integral manner with optimum geometry for track balast in reailroads.
CN107858873A (en) * 2017-10-31 2018-03-30 天津银龙预应力材料股份有限公司 A kind of durable type railroad sleeper

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE445943A (en) *
BE479679A (en) *
US2535100A (en) * 1949-01-17 1950-12-26 James A Sourwine Process for prestressing cement products
GB682320A (en) * 1949-02-07 1952-11-05 Armand Blaton Method of forming passages in concrete beams or the like
DE880645C (en) * 1951-07-12 1953-06-22 Wayss & Freytag A G Method for producing channels in concrete, in particular channels for tendons
DE1084464B (en) * 1953-09-03 1960-06-30 Moossche Eisenwerke Ag Reinforcing wire or rod, especially for prestressed concrete, as well as method and device for its production
FR1194229A (en) * 1957-04-20 1959-11-06
DE1058909B (en) * 1957-11-19 1959-06-04 Werner Karig Dr Ing Device for making railway sleepers from prestressed concrete
NL265616A (en) * 1960-06-21
NL135455C (en) * 1967-01-03
AT279124B (en) * 1968-05-07 1970-02-25 Holzmann Philipp Ag Process and duct for the production of prestressed concrete components
DE2717869B2 (en) * 1977-04-22 1979-05-31 Dyckerhoff & Widmann Ag, 8000 Muenchen Method for stiffening a thin-walled duct and for threading a tendon into the duct
JPS6076216A (en) * 1983-10-04 1985-04-30 Naniwa Seitei Kk Manufacture of metallic bar-material having plastically worked spiral groove on its periphery
CA1280909C (en) * 1985-04-08 1991-03-05 Mikio Mizoe Prestressing steel material
US4726163A (en) * 1985-06-10 1988-02-23 Jacobs William A Prestressed plastic bodies and method of making same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202018106169U1 (en) 2018-09-20 2018-11-08 Leonhard Moll Betonwerke Gmbh & Co Kg Device for stabilizing the front sides of precast concrete elements

Also Published As

Publication number Publication date
EP0624697A1 (en) 1994-11-17
ES2112216T1 (en) 1998-04-01
PT624697E (en) 2000-12-29
ES2112216T3 (en) 2000-11-01
ES1026242Y (en) 1994-09-01
DE59409453D1 (en) 2000-08-24
EP0625414A1 (en) 1994-11-23
ATE194862T1 (en) 2000-08-15
ES1026242U (en) 1994-04-01

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