DE900194C - Process for the production of longer prestressed concrete bodies in heated formwork - Google Patents

Process for the production of longer prestressed concrete bodies in heated formwork

Info

Publication number
DE900194C
DE900194C DEH5769D DEH0005769D DE900194C DE 900194 C DE900194 C DE 900194C DE H5769 D DEH5769 D DE H5769D DE H0005769 D DEH0005769 D DE H0005769D DE 900194 C DE900194 C DE 900194C
Authority
DE
Germany
Prior art keywords
production
concrete
prestressed concrete
longer
concrete bodies
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
DEH5769D
Other languages
German (de)
Inventor
Ewald Hoyer
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DEH5769D priority Critical patent/DE900194C/en
Application granted granted Critical
Publication of DE900194C publication Critical patent/DE900194C/en
Expired legal-status Critical Current

Links

Classifications

    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)

Description

Verfahren zur Herstellung von längeren Spannbetonkörpern in geheizten Schalungen Bei der Herstellung von längeren Körpern aus Spannbeton in geheizten Schalungen entstehen in den Betonkörpern sehr oft Querrisse. Diese Querrisse verschwinden zwar wieder nach dem Lösen der auf dieBewehrungwirkenden Spannvorrichtung, d. h. bei der Übertragung der Vorspannkraft auf denBeton. DieseQuerrisse sind jedoch unerwünscht, da sie den Betonkörper in der späteren Zugzone unterbrechen und demgemäß die Betonzugfestigkeit nicht mehr zur Aufnahme von Zugkräften herangezogen werden kann. Außerdem treten bei Belastung des Betonkörpers diese Risse wieder in Erscheinung und ermöglichen das schädliche Eindringen von Wasser in den Betonkörper.Process for the production of longer prestressed concrete bodies in heated Formwork In the manufacture of longer bodies from prestressed concrete in heated Formwork very often creates transverse cracks in the concrete. These transverse cracks disappear again after loosening the tensioning device acting on the reinforcement, d. H. when transferring the prestressing force to the concrete. However, these transverse cracks are undesirable, because they interrupt the concrete body in the later tensile zone and accordingly the tensile strength of the concrete can no longer be used to absorb tensile forces. Also kick when the concrete body is loaded, these cracks reappear and enable the harmful ingress of water into the concrete body.

Erfindungsgemäß können diese Querrisse dadurch vermieden werden, daß die Vorspannkraft der Bewehrung sofort nach erfolgter Erhärtung der Betonkörper und vor Abkühlung derselben durch Entspannen der Bewehrung auf den Beton übertragen wird. Es hat sich nämlich gezeigt, daß die Hauptursache der Bildung der Querrisse darin zu sehen isst, @daß nach dem Abstellen der Heizung .infolge der eintretenden Abkühlung der Betonkörper eine Zusammenziehung und Verkürzung des Betons eintritt, Da nun die Bewehrungen mit Rücksicht auf die festen Spannvorrichtungen dieser Verkürzung nicht mitmachen, so entstehen Querrisse an verschiedenen Stellen der Betonkörper. Diese werden vermieden, wenn im Sinn der Erfindung sofort nach dem Abstellen der Schalungsheizung, .d. h,. vor beginnender Abkühlung, die Spannvorrichtungen gelöst und die Vorspannkraft der Bewehrung auf den Beton übertragen wird.According to the invention, these transverse cracks can be avoided in that the prestressing force of the reinforcement immediately after the concrete body has hardened and transferred to the concrete by relaxing the reinforcement before it cools down will. It has been shown that the main cause of the formation of the transverse cracks to see in it eats @ that after turning off the heating. as a result of the entering When the concrete body cools, the concrete contracts and shortens, There now the reinforcements with regard to the fixed clamping devices of this shortening do not join in, this creates transverse cracks in various places on the concrete body. These are avoided if, within the meaning of the invention, immediately after turning off the Formwork heating, .d. H,. before the cooling begins, the clamping devices are loosened and the prestressing force of the reinforcement is transferred to the concrete.

Claims (1)

PATENTe1NSPRUGH: Verfahren zur Herstellung von längeren Spannbetonkörpern in beheizten Schalungen, dadurch gekennzeichnet, daB die Vorspannkraft der Bewehrung sofort nach erfolgter Erhürtung -der Betonkörper und vor Abkühlung derselben durch Entspannen der Bewehrung auf den Beton übertragen wird.PATENTe1NSPRUGH: Process for the production of longer prestressed concrete bodies in heated formwork, characterized in that the prestressing force of the reinforcement Immediately after the concrete body has hardened and before it has cooled down Relaxation of the reinforcement is transferred to the concrete.
DEH5769D 1942-06-30 1942-06-30 Process for the production of longer prestressed concrete bodies in heated formwork Expired DE900194C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEH5769D DE900194C (en) 1942-06-30 1942-06-30 Process for the production of longer prestressed concrete bodies in heated formwork

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEH5769D DE900194C (en) 1942-06-30 1942-06-30 Process for the production of longer prestressed concrete bodies in heated formwork

Publications (1)

Publication Number Publication Date
DE900194C true DE900194C (en) 1953-12-21

Family

ID=7144489

Family Applications (1)

Application Number Title Priority Date Filing Date
DEH5769D Expired DE900194C (en) 1942-06-30 1942-06-30 Process for the production of longer prestressed concrete bodies in heated formwork

Country Status (1)

Country Link
DE (1) DE900194C (en)

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