Rebar Hrb355 Hrb400 Hrb500 8mm 10mm 12mm 14mm 16mm Ribbed Bar Bar maras kyau

1) Kewayon diamita mara kyau da diamita shawarar
Mafi girman diamita na sandunan ƙarfe ya fito daga 6 zuwa 50mm, kuma ƙa'idodin da aka ba da shawarar mafi girman diamita na sandunan ƙarfe sune 6, 8, 10, 12, 14, 16, 20, 25, 32, 40, da 50mm.
2) Bambance-bambancen da aka yarda da sifar saman da girman ribbed karfe sandar
Ka'idodin ƙira na sandunan ƙarfe na ribbed yakamata su dace da buƙatun masu zuwa:
Matsakaicin β tsakanin haƙarƙari mai jujjuyawa da axis na sandar ƙarfe bai kamata ya zama ƙasa da digiri 45 ba. Lokacin da kusurwar da aka haɗa ba ta fi digiri 70 ba, jagorancin madaidaicin sanduna a bangarorin biyu na sandar karfe ya kamata ya zama akasin haka;
Matsakaicin tazarar l na sanduna masu jujjuya bai kamata ya zama fiye da sau 0.7 na madaidaicin diamita na sanduna ba;
Matsakaicin α tsakanin gefen haƙarƙari mai jujjuyawa da saman sandar ƙarfe ba zai zama ƙasa da digiri 45 ba;
Jimlar gibin (ciki har da faɗin haƙarƙari na tsaye) a ƙarshen haƙarƙari masu jujjuyawa a ɓangarorin da ke kusa da sandar ƙarfe ba za su fi 20% na madaidaicin madaidaicin sandar ƙarfe ba;
Lokacin da ƙananan diamita na sandar ƙarfe ba ta wuce 12mm ba, yankin haƙarƙarin dangi bai kamata ya zama ƙasa da 0.055; lokacin da diamita mara kyau shine 14mm da 16mm, yankin haƙarƙarin dangi bai kamata ya zama ƙasa da 0.060 ba; Lokacin da diamita mara kyau ya fi 16mm, yankin haƙarƙarin dangi bai kamata ya zama ƙasa da 0.065 ba. Duba Karin Bayani na C don lissafin yanki na haƙarƙari.
Sandunan ƙarfe na ribbed gabaɗaya suna da sanduna masu tsayi, kuma akwai kuma waɗanda ba su da sandunan tsayi;