1) Ibanga lobubanzi obujwayelekile kanye nobubanzi obunconyiwe
Ububanzi obujwayelekile bemigoqo yensimbi busukela ku-6 kuye ku-50mm, kanti amadayamitha ajwayelekile anconyiwe wamabha ensimbi angu-6, 8, 10, 12, 14, 16, 20, 25, 32, 40, kanye no-50mm.
2) Ukuchezuka okuvumelekile komumo ongaphezulu nosayizi webha yensimbi enezimbambo
Izimiso zokuklama zezimbambo eziphambanayo zemigoqo yensimbi enezimbambo zizohlangabezana nalezi zidingo ezilandelayo:
I-engeli engu-β phakathi kombambo ovundlayo kanye ne-eksisi yebha yensimbi akufanele ibe ngaphansi kwamadigri angu-45. Uma i-engeli efakiwe ingekho ngaphezu kwamadigri angu-70, isiqondiso sezimbambo eziphambene ezinhlangothini eziphambene zebha yensimbi kufanele zihluke;
Isikhala esilinganiselwe esingu-l sezimbambo eziphambene akufanele sibe sikhulu kunezikhathi ezingu-0.7 zobukhulu obujwayelekile bebha yensimbi;
I-engeli engu-α phakathi kohlangothi lwembambo eguquguqukayo kanye nobuso bebha yensimbi akufanele ibe ngaphansi kwamadigri angu-45;
Isamba sezikhala (okuhlanganisa nobubanzi bezimbambo ze-longitudinal) phakathi kwamaphethelo ezimbambo eziphambene ezinhlangothini ezimbili ezincikene zebha yensimbi akufanele sibe sikhulu kuno-20% wepherimitha okuzisholo yona yensimbi yensimbi;
Lapho ububanzi obujwayelekile bensimbi yensimbi bungekho ngaphezu kwe-12mm, indawo yombambo ohlobene akufanele ibe ngaphansi kuka-0.055; lapho ububanzi obujwayelekile bungu-14mm no-16mm, indawo yombambo ohlobene akufanele ibe ngaphansi kuka-0.060; lapho ububanzi bokuzisholo bungaphezu kuka-16mm, indawo yombambo ohlobene akufanele ibe ngaphansi kuka-0.065. Bheka ku-Appendix C ukuze ubale indawo yombambo ohlobene.
Imigoqo yensimbi enezimbambo ngokuvamile inezimbambo ze-longitudinal, kodwa futhi ngaphandle kwezimbambo ze-longitudinal;
3) Ubude nokuchezuka okuvumelekile
A. Ubude:
Izinsimbi zensimbi ngokuvamile zilethwa ngobude obunqunyiwe, futhi ubude obuthile bokulethwa kufanele buboniswe kunkontileka;
Imigoqo yokuqinisa ingalethwa ngamakhoyili, futhi ireli ngayinye kufanele ibe i-rebar eyodwa, okuvumela u-5% yenani lamareli kubhetshi ngayinye (amareli amabili uma engaphansi kwamabili) ahlanganisa ama-rebar amabili. Isisindo sediski nobubanzi bediski kunqunywa ngokuxoxisana phakathi komphakeli nomthengi.
B. ukubekezelela ubude:
Ukuchezuka okuvunyelwe kobude bebha yensimbi uma ilethwa kubude obunqunyiwe akumele kube kukhulu kuno-±25mm;
Uma ubude obuncane budingeka, ukuphambuka kwawo kungu-+50mm;
Lapho ubude obukhulu budingeka, ukuchezuka kungu-50mm.
C. ukugoba neziphetho:
Ukuphela kwebha yensimbi kufanele kugundwe ngokuqondile, futhi ukuguqulwa kwendawo akufanele kuthinte ukusetshenziswa.