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Tuesday, 15 April 2014 16:49

PROVISION OF PRESTRESSING SAFETY IN REINFORCED CONCRETE STRUCTURES

V.BETZ, A.KUBANEISHVILI, A.IURIATINI, A. SARJVELADZE
(Georgia)

Safety of  stretching out and transpassing jacks was discussed. Losses caused in result of friction in various types of collars and seals between piston, rod and cylinder found in a jack have been shown. The losses depend on constructional design of material and degree of cylinder and rod surface treatment, their state and other reasons and loss can consist 10 – 12 %.

The definite construction of a device for jack calibration which was used actually for calibration of two kinds of jack was presented. Losses at friction and their influence  on reliable values of the jack was shown.

Last Updated on Tuesday, 15 April 2014 18:33
 
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