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JG 225-2007 Metal Corrugated Pipe Used in Prestressing Concrete
Metal prestressing corrugated pipe: there are alias metal corrugated pipe, metal helix tube, filling with concrete pipe, corrugated pipe used in foundation bolt. Adopting high quality of steel tape after pressure wave, reeling to tube, mouthpiece, cutting off and other production process.
Character: light, thin wall, high rigidity, unbroken, no leakage, firmly withno opening buckle, high bonding performance with concrete, high anti-seismic performance.
It is used for prestress concrete structure, construction member, prepared hole for construction, assort with anchorage of steel strand bundle, diameter of common prestress steel strand is 12.7mm and 15.2mm.
Type
Metal corrugated pipe is divided into standard and strengthen type according to rigidity, round and flat type according to shape of section, double wave and more wave type according to number of raised wave between two adjoining folded mouthpiece.
Requirement of radial rigidity for Metal prestress corrugated pipe
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Shape of section |
round |
flat |
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Centralize
Loading/N |
Standard |
800 |
500 |
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strengthen |
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Equispaced loading/N |
Standard |
F=0.31d ² |
F=0.15d ² |
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strengthen |
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δ |
Standard |
d≤75mm |
≤0.20 |
≤0.20 |
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d＞75mm |
≤0.15 |
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strengthen |
d≤75mm |
≤0.10 |
≤0.15 |
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d＞75mm |
≤0.08 |
Requirement for anti-leakage performance:
after reaching to specified centralize loading and bending, cement paste is allowed water percolation without slurry.
Testing for Radia rigidity: rigidity testing for centralize loading, rigidity testing for equispaced loading
centralize loading
equispace loading
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