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Ko te paati ki te whai i te paerewa AASHTO M180, GB-T 31439.1-2015 me te paerewa EN1317.
Ko nga rauemi mo tera ko te Q235B (S235Jr te kaha o te kotinga he nui atu i te 235Mpa) me te Q345B (S355Jr te kaha whakaputa he nui ake i te 345Mpa).
Mo te matotoru o te kaitiaki i roto i te 2.67mm ki te 4.0mm.
Ko te maimoatanga o te mata ka werohia he wera wera, ki te whai i te AASHTO M232 me te paerewa rite penei i te AASHTO M111, EN1461 etc.
I hoahoahia te kaitiaki mo te wehe i te rori ki etahi waahanga rereke, ka whakaheke i te kino i te wa i tupono ake te aitua.

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