Tendon supports
Spacing 's' between supports is given as a function of the duct diameter. s is less than or equal to 10-12 times the internal duct diameter (s<10 to 12 x Φi.duct)
Plastic half-shells are used to prevent PT-PLUS® ducts from being dented when installed in curved sections where R< 2 * R_min
텐던 서포트 .
지지대 사이의 간격 's'는 덕트의 함수로 주어집니다.
s는 내부 덕트 직경의 10-12배 이하입니다(s<10~12 x Φi.duct).
플라스틱 하프쉘은 R< 2 * R_min인 곡선 섹션에 설치할 때 PT-PLUS® 덕트가 찌그러지는 것을 방지하기 위해 사용됩니다.
Lmin - minimum straight length behind the anchorage
Lmin = 0,8m for units up to 6-7
=1.0m for 6-12 to 6-22 units
=1.5m for 6-27 units and larger
Rmin - minimum radius of tendon curvature
Drain at low point of tendon
Required for drainage in special cases only, in particular if tendons are left ungrouted during the winter season
Detailing of tendon layout for external tendons
During installation, temporary support of PE pipes is required.
During service life, permanent supports may be required if distances between deviators and/or anchorages exceed 15m for road bridges or 12m for railway bridges to avoid cable vibrations due to traffic loads.
The voids for the PE duct in deviators and the bellmouth where tendons exit at anchorage diaphragms are formed by a reusable tool called ‘Diabolo’.
Diabolo is fixed by bolts to the formwork and removed after curing, leaving a path for the tendon to pass through.
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