DE943194C - Process for the manufacture of bundle-reinforced components and structures from prestressed concrete - Google Patents

Process for the manufacture of bundle-reinforced components and structures from prestressed concrete

Info

Publication number
DE943194C
DE943194C DED11907A DED0011907A DE943194C DE 943194 C DE943194 C DE 943194C DE D11907 A DED11907 A DE D11907A DE D0011907 A DED0011907 A DE D0011907A DE 943194 C DE943194 C DE 943194C
Authority
DE
Germany
Prior art keywords
bundle
structures
prestressed concrete
manufacture
reinforcement
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
Application number
DED11907A
Other languages
German (de)
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.)
Walter Bau AG
Original Assignee
Dyckerhoff and Widmann AG
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 Dyckerhoff and Widmann AG filed Critical Dyckerhoff and Widmann AG
Priority to DED11907A priority Critical patent/DE943194C/en
Application granted granted Critical
Publication of DE943194C publication Critical patent/DE943194C/en
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/12—Mounting of reinforcing inserts; Prestressing

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)

Description

Verfahren zum Herstellen von bündelbewehrten Bauteilen und -konstruktionen aus Spannbeton Für Konstruktionen aus Spannbeton werden überwiegend Stahlsorten hoher Festigkeit verwendet. Hierbei treten folgende Probleme auf Stähle von mehr als ioo kg/mm2 Festigkeit können zur Zeit wirtschaftlich nur in verhältnismäßig kleinen Durchmessern hergestellt werden, so daß ein Einzelstab nur wenige Tonnen Tragkraft besitzt. Man vereinigt daher aus wirtschaftlichen Gründen zahlreiche Stähle in einem Zugorgan, wodurch schwer zu lösende ausführungstechnische Aufgaben entstehen, die besonders die gleichmäßige Verteilung und die gleichmäßige Herstellung des Verbundes betreffen. Insbesondere beim Ziehen um Krümmungen ist es schwierig, die quer zur Achse des Zugorgans infolge seiner Gliederung auftretenden Querdrücke zu beherrschen und eine Haftübertragung von den inneren auf die äußeren Glieder des Zugorgans sicherzustellen.Process for the manufacture of bundle-reinforced components and structures made of prestressed concrete For structures made of prestressed concrete, steel types are predominantly used high strength used. Here, the following problems arise on steels of more more than 100 kg / mm2 strength can currently only be relatively economical small diameters can be produced, so that a single rod is only a few tons Has carrying capacity. Numerous steels are therefore combined for economic reasons in a pulling element, which results in difficult-to-solve technical tasks, especially the even distribution and the even production of the bond affect. Especially when dragging around bends, it is difficult to pull across the Axis of the traction organ as a result of its structure to control transverse pressures occurring and ensure a transfer of adhesion from the inner to the outer links of the tension member.

Üblicherweise werden gebündelte Zugglieder in Hüllrohren aus Blech verlegt, die einbetoniert werden. Die Ordnung der Einzelglieder eines solchen Zugorgans wird hierbei an den Enden durch die Verankerung hergestellt. An dieser Stelle haben die Einzeldrähte einen Abstand, der es ermöglicht, durch das Einspritzen von Zementleim in das Rohr einen Verbund sicherzustellen. An der Krümmung jedoch werden die Drähte durch den infolge der Krümmung auftretenden Querdruck aufeinandergepreßt, so daß die Drähte an dieser Stelle ohne Abstand aufeinanderliegen. Zwischen der Verankerungsstelle und der Krümmung nehmen die Abstände auf Null ab. Es entstehen hierbei zwischen den Drähten auf Null abnehmende Spalten, durch die der Zementleim durchgepreßt wird. Hierbei wird das Wasser aus dem Zementleim ausgefiltert, und als Folge davon entstehen leicht Verstopfungen sowie eine Verdünnung des Zementleims, die einen ordnungsmäßigen Verbund in Frage stellen.Usually bundled tension members are placed in sheet metal ducts laid, which are set in concrete. The order of the individual members of such a pulling organ is created by the anchoring at the ends. Have at this point the individual wires have a spacing that allows them to by injecting cement paste to ensure a bond in the pipe. At the bend, however, the wires become pressed against one another by the transverse pressure occurring as a result of the curvature, so that the wires are lying on top of each other without any gap. Between the anchorage point and the curvature, the distances decrease to zero. It arises here between the wires decreasing to zero gaps through which the cement paste is pressed. Here, the water is filtered out of the cement paste, and as a result it is created easy clogging as well as a dilution of the cement paste, which is a proper Questioning the network.

Diese unangenehmen Auswirkungen lassen sich erfindungsgemäß dadurch beheben, daß die Bewehrungsdrähte erst nach dem Auspressen der Hohlräume in den - die Drähte aufnehmenden Blechrohren, aber vor dem Abbinden des eingepreßten Zementleims gespannt werden. In diesem. Zustand ist das Bündel noch geordnet. Die Ordnung wird üblicherweise durch eine den Kern des Bündels bildende Spirale hergestellt. Wenn nunmehr nach erfolgter Auspressung das Bündel angespannt wird, ist sichergestellt, daß alle Einzeldrähte mit Zementleim gleicherGüteummanteltsind. EineEntmischung des Zementleimes kann auf diesem einfachen Weg zuverlässig vermieden werden. Die Tatsache, daß sich die einzelnen Bewehrungsdrähte durch den Ouerdruck beim Spannen aufeinanderdrücken, ist nunmehr weniger belangvoll, da der Verbund trotzdem durch das Abbinden des Zementleims hergestellt wird.According to the invention, these unpleasant effects can thereby be avoided fix that the reinforcement wires only after pressing out the cavities in the - The sheet metal tubes which take up the wires, but before the cement glue is set be excited. In this. The bundle is still in order. The order will usually made by a spiral forming the core of the bundle. if Now that the bundle is tightened after it has been pressed out, it is ensured that all individual wires are coated with cement paste of the same quality. A segregation the cement paste can be reliably avoided in this simple way. the The fact that the individual reinforcement wires due to the Ouerdruck when tensioning press on each other is now less important, since the composite is still through the setting of the cement paste is established.

Claims (1)

PATENTANSPRUCH; Verfahren zum Herstellen von bündelbewehrten Spannbetonbauteilen und -konstruktionen mit nachträglichem Verbund durch Auspressen der Hohlräume zwischen den gebündelten Zuggliedern und den diese aufnehmenden Hüllrohren, dadurch gekennzeichnet, daß die Bewehrung erst nach dem Auspressen der Hohlräume im Bereich der die Bewehrung aufnehmenden Blechrohre, aber vor dem Abbinden des eingepreßten Zementleims angespannt'wird. Angezogene Druckschriften: Deutsche Patentschrift Nr. 809 533; »Beton- und Stahlbetonbau«, 195o, Heft 6, S. 137 bis 139; »Technische Blätter der Wayss & Freytag AG«, 1951, S. 15ff.; »Der Bauingenieur«, 1951, Heft 5/6; »Die neue Ruhrbrücke Herdecke«.PATENT CLAIM; Process for the production of bundle-reinforced prestressed concrete components and structures with a subsequent bond by pressing out the cavities between the bundled tension members and the ducts receiving them, characterized in that the reinforcement is only applied after the hollow spaces have been pressed out in the area of the sheet metal pipes receiving the reinforcement, but before they are set of the pressed-in cement paste is tightened. Cited publications: German Patent No. 809 533; "Beton- und Stahlbetonbau", 195o, issue 6, pp. 137 to 139; "Technical sheets of Wayss & Freytag AG", 1951, p. 15ff .; "The civil engineer", 1951, issue 5/6; "The new Ruhr Bridge Herdecke".
DED11907A 1952-03-27 1952-03-27 Process for the manufacture of bundle-reinforced components and structures from prestressed concrete Expired DE943194C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DED11907A DE943194C (en) 1952-03-27 1952-03-27 Process for the manufacture of bundle-reinforced components and structures from prestressed concrete

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DED11907A DE943194C (en) 1952-03-27 1952-03-27 Process for the manufacture of bundle-reinforced components and structures from prestressed concrete

Publications (1)

Publication Number Publication Date
DE943194C true DE943194C (en) 1956-05-17

Family

ID=7033925

Family Applications (1)

Application Number Title Priority Date Filing Date
DED11907A Expired DE943194C (en) 1952-03-27 1952-03-27 Process for the manufacture of bundle-reinforced components and structures from prestressed concrete

Country Status (1)

Country Link
DE (1) DE943194C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2642103A1 (en) * 1989-01-24 1990-07-27 Freyssinet Int Stup Improvements to processes and devices for prestressing concrete by post-tensioning

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE809533C (en) * 1949-10-20 1951-07-30 Wayss & Freytag A G Process for the manufacture of prestressed concrete bodies

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE809533C (en) * 1949-10-20 1951-07-30 Wayss & Freytag A G Process for the manufacture of prestressed concrete bodies

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2642103A1 (en) * 1989-01-24 1990-07-27 Freyssinet Int Stup Improvements to processes and devices for prestressing concrete by post-tensioning

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