{"id":7915,"date":"2021-06-07T07:14:28","date_gmt":"2021-06-07T07:14:28","guid":{"rendered":"https:\/\/thuvienxaydung.com.vn\/?p=7915"},"modified":"2021-06-07T07:15:52","modified_gmt":"2021-06-07T07:15:52","slug":"tieu-chuan-viet-nam-tcvn-1651-22008-ve-thep-cot-be-tong-phan-2-thep-thanh-van","status":"publish","type":"post","link":"https:\/\/tailieuxaydung.net\/?p=7915","title":{"rendered":"Ti\u00eau chu\u1ea9n Vi\u1ec7t Nam TCVN 1651-2:2008 v\u1ec1 th\u00e9p c\u1ed1t b\u00ea t\u00f4ng \u2013 ph\u1ea7n 2: Th\u00e9p thanh v\u1eb1n"},"content":{"rendered":"
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Ti\u00eau chu\u1ea9n Vi\u1ec7t Nam TCVN 1651-2:2008 v\u1ec1 th\u00e9p c\u1ed1t b\u00ea t\u00f4ng \u2013 ph\u1ea7n 2: th\u00e9p thanh v\u1eb1n do B\u1ed9 Khoa h\u1ecdc v\u00e0 C\u00f4ng ngh\u1ec7 ban h\u00e0nh<\/strong>\u00a0\u0111\u00e3 \u0111\u01b0\u1ee3c thay th\u1ebf b\u1edfi\u00a0Ti\u00eau chu\u1ea9n qu\u1ed1c gia TCVN 1651-2:2018 v\u1ec1 Th\u00e9p c\u1ed1t b\u00ea t\u00f4ng – Ph\u1ea7n 2: Th\u00e9p thanh v\u1eb1n<\/strong>\u00a0.<\/p>\n<\/div>\n

N\u1ed9i dung to\u00e0n v\u0103n Ti\u00eau chu\u1ea9n Vi\u1ec7t Nam TCVN 1651-2:2008 v\u1ec1 th\u00e9p c\u1ed1t b\u00ea t\u00f4ng \u2013 ph\u1ea7n 2: th\u00e9p thanh v\u1eb1n do B\u1ed9 Khoa h\u1ecdc v\u00e0 C\u00f4ng ngh\u1ec7 ban h\u00e0nh<\/p>\n

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TI\u00caU CHU\u1ea8N VI\u1ec6T\u00a0<\/b>NAM<\/b><\/p>\n

TCVN 1651-2:2008<\/b><\/p>\n

TH\u00c9P C\u1ed0T B\u00ca T\u00d4NG \u2013 PH\u1ea6N 2: TH\u00c9P THANH V\u1eb0N
\nSteel for the reinforcement of concrete \u2013 Part 2: Ribbed bars<\/i><\/p>\n

L\u1eddi n\u00f3i \u0111\u1ea7u<\/b><\/p>\n

TCVN 1651-2: 2008 thay th\u1ebf cho TCVN 6285: 1997.<\/p>\n

TCVN 1651-2: 2008 \u0111\u01b0\u1ee3c bi\u00ean so\u1ea1n tr\u00ean c\u01a1 s\u1edf<\/p>\n

ISO 6935-2: 2007; JIS 3112: 2004 v\u00e0 GB 1499:1998.<\/p>\n

TCVN 1651-2: 2008 do Ban k\u1ef9 thu\u1eadt ti\u00eau chu\u1ea9n TCVN\/TC 17 Th\u00e9p bi\u00ean so\u1ea1n,<\/p>\n

T\u1ed5ng c\u1ee5c Ti\u00eau chu\u1ea9n \u0110o l\u01b0\u1eddng Ch\u1ea5t l\u01b0\u1ee3ng \u0111\u1ec1 ngh\u1ecb, B\u1ed9 Khoa h\u1ecdc v\u00e0 C\u00f4ng ngh\u1ec7 c\u00f4ng b\u1ed1.<\/p>\n

TCVN 1651: 2008 thay th\u1ebf cho TCVN 1651: 1985; TCVN 6285: 1997; TCVN 6286: 1997.<\/p>\n

TCVN 1651: 2008 g\u1ed3m c\u00f3 ba ph\u1ea7n:<\/p>\n

– Ph\u1ea7n 1: Th\u00e9p thanh tr\u00f2n tr\u01a1n;<\/p>\n

– Ph\u1ea7n 2: Th\u00e9p thanh v\u1eb1n;<\/p>\n

– Ph\u1ea7n 3 (ISO 6935-3: 1992-Technical corrigendum 1- 2000): L\u01b0\u1edbi th\u00e9p h\u00e0n.<\/p>\n

1. Ph\u1ea1m vi \u00e1p d\u1ee5ng<\/b><\/p>\n

Ti\u00eau chu\u1ea9n n\u00e0y quy \u0111\u1ecbnh y\u00eau c\u1ea7u k\u1ef9 thu\u1eadt cho th\u00e9p thanh v\u1eb1n d\u00f9ng l\u00e0m c\u1ed1t trong c\u00e1c k\u1ebft c\u1ea5u b\u00ea t\u00f4ng.<\/p>\n

Ti\u00eau chu\u1ea9n n\u00e0y \u00e1p d\u1ee5ng cho ba m\u00e1c th\u00e9p l\u00e0 CB300-V, CB400-V, CB500-V. C\u00f4ng ngh\u1ec7 ch\u1ebf t\u1ea1o cho nh\u00e0 s\u1ea3n xu\u1ea5t l\u1ef1a ch\u1ecdn.<\/p>\n

CH\u00da TH\u00cdCH: Ch\u1eef \u201cCB\u201d \u0111\u1ea7u ti\u00ean l\u00e0 vi\u1ebft t\u1eaft c\u1ee7a t\u1eeb c\u1ed1t b\u00ea t\u00f4ng. Ba ch\u1eef s\u1ed1 ti\u1ebfp theo th\u1ec3 hi\u1ec7n gi\u00e1 tr\u1ecb qui \u0111inh c\u1ee7a gi\u1edbi h\u1ea1n ch\u1ea3y tr\u00ean. K\u00fd hi\u1ec7u cu\u1ed1i c\u00f9ng \u201cV\u201d l\u00e0 vi\u1ebft t\u1eaft c\u1ee7a th\u00e9p thanh v\u1eb1n.<\/p>\n

<\/div>\n

Ti\u00eau chu\u1ea9n n\u00e0y \u00e1p d\u1ee5ng cho c\u00e1c thanh v\u1eb1n \u0111\u01b0\u1ee3c cung c\u1ea5p \u1edf d\u1ea1ng th\u1eb3ng. Ti\u00eau chu\u1ea9n n\u00e0y c\u0169ng \u00e1p d\u1ee5ng cho c\u00e1c thanh v\u1eb1n d\u1ea1ng cu\u1ed9n v\u00e0 c\u00e1c s\u1ea3n ph\u1ea9m \u0111\u01b0\u1ee3c n\u1eafn th\u1eb3ng.<\/p>\n

Ti\u00eau chu\u1ea9n n\u00e0y kh\u00f4ng \u00e1p d\u1ee5ng cho th\u00e9p thanh v\u1eb1n \u0111\u01b0\u1ee3c ch\u1ebf t\u1ea1o t\u1eeb th\u00e0nh ph\u1ea9m nh\u01b0 th\u00e9p t\u1ea5m hay \u0111\u01b0\u1eddng ray xe l\u1eeda.<\/p>\n

2. T\u00e0i li\u1ec7u vi\u1ec7n d\u1eabn<\/b><\/p>\n

C\u00e1c t\u00e0i li\u1ec7u d\u01b0\u1edbi \u0111\u00e2y l\u00e0 r\u1ea5t c\u1ea7n thi\u1ebft \u0111\u1ed1i v\u1edbi vi\u1ec7c \u00e1p d\u1ee5ng ti\u00eau chu\u1ea9n n\u00e0y. \u0110\u1ed1i v\u1edbi t\u00e0i li\u1ec7u c\u00f3 ghi n\u0103m c\u00f4ng b\u1ed1, \u00e1p d\u1ee5ng phi\u00ean b\u1ea3n \u0111\u01b0\u1ee3c n\u00eau. \u0110\u1ed1i v\u1edbi t\u00e0i li\u1ec7u kh\u00f4ng c\u00f3 n\u0103m c\u00f4ng b\u1ed1, \u00e1p d\u1ee5ng phi\u00ean b\u1ea3n m\u1edbi nh\u1ea5t (k\u1ec3 c\u1ea3 c\u00e1c s\u1eeda \u0111\u1ed5i).<\/p>\n

TCVN 4399: 2008 (ISO 404: 1992), Th\u00e9p v\u00e0 s\u1ea3n ph\u1ea9m th\u00e9p \u2013 Y\u00eau c\u1ea7u k\u1ef9 thu\u1eadt chung khi cung c\u1ea5p.<\/p>\n

ISO\/TS 4949 Steel names based on letter symbols (T\u00ean th\u00e9p d\u1ef1a tr\u00ean c\u00e1c k\u00fd hi\u1ec7u b\u1eb1ng ch\u1eef).<\/p>\n

ISO\/TR 9769: 1991 Steel an iron \u2013 Review of available methods of analysis (Th\u00e9p v\u00e0 gang \u2013 T\u1ed5ng quan v\u1ec1 ph\u01b0\u01a1ng ph\u00e1p ph\u00e2n t\u00edch hi\u1ec7n c\u00f3).<\/p>\n

ISO 10144, Certification scheme for steel bars and wires for the reinforcement of concrete structures (H\u1ec7 th\u1ed1ng ch\u1ee9ng nh\u1eadn \u0111\u1ed1i v\u1edbi th\u00e9p thanh v\u00e0 d\u00e2y d\u00f9ng cho k\u1ebft c\u1ea5u c\u1ed1t b\u00ea t\u00f4ng).<\/p>\n

ISO 14284: 1996, Steel and iron \u2013 Sampling and preparation of samples for the determination of chemical composition (Th\u00e9p v\u00e0 gang \u2013 L\u1ea5y m\u1eabu v\u00e0 chu\u1ea9n b\u1ecb m\u1eabu \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc).<\/p>\n

ISO 15630-1, Steel for the reinforcement and prestressing c\u1ee7a concrete \u2013 Test methods \u2013 Part 1: Reinforcing bars, wire rod and wire (Th\u00e9p d\u00f9ng l\u00e0m c\u1ed1t b\u00ea t\u00f4ng v\u00e0 b\u00ea t\u00f4ng d\u1ef1 \u1ee9ng l\u1ef1c \u2013 Ph\u01b0\u01a1ng ph\u00e1p th\u1eed – Ph\u1ea7n 1: Th\u00e9p thanh, d\u00e2y th\u1eb3ng v\u00e0 d\u00e2y l\u00e0m c\u1ed1t b\u00ea t\u00f4ng).<\/p>\n

3. K\u00fd hi\u1ec7u<\/b><\/p>\n

C\u00e1c k\u00fd hi\u1ec7u s\u1eed d\u1ee5ng trong ti\u00eau chu\u1ea9n n\u00e0y \u0111\u01b0\u1ee3c li\u1ec7t k\u00ea trong B\u1ea3ng 1.<\/p>\n

B\u1ea3ng 1 \u2013 C\u00e1c k\u00fd hi\u1ec7u<\/b><\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\n

K\u00fd hi\u1ec7u<\/b><\/p>\n<\/td>\n

\n

\u0110\u01a1n v\u1ecb<\/b><\/p>\n<\/td>\n

\n

M\u00f4 t\u1ea3<\/b><\/p>\n<\/td>\n

\n

\u0110i\u1ec1u vi\u1ec7n d\u1eabn<\/b><\/p>\n<\/td>\n<\/tr>\n

\n

a<\/p>\n<\/td>\n

\n

mm<\/p>\n<\/td>\n

Chi\u1ec1u cao g\u00e2n<\/td>\n4.10, \u0110i\u1ec1u 6<\/td>\n<\/tr>\n
\n

A5<\/sub><\/p>\n<\/td>\n

\n

%<\/p>\n<\/td>\n

\u0110\u1ed9 gi\u00e3n d\u00e0i t\u01b0\u01a1ng \u0111\u1ed1i sau khi \u0111\u1ee9t<\/td>\n8.1, 9.1<\/td>\n<\/tr>\n
\n

Agt<\/sub><\/p>\n<\/td>\n

\n

%<\/p>\n<\/td>\n

\u0110\u1ed9 gi\u00e3n d\u00e0i t\u1ed5ng \u1ee9ng v\u1edbi l\u1ef1c l\u1edbn nh\u1ea5t<\/td>\n8.1, 9.1<\/td>\n<\/tr>\n
\n

An<\/sub><\/p>\n<\/td>\n

\n

mm2<\/sup><\/p>\n<\/td>\n

Di\u1ec7n t\u00edch m\u1eb7t c\u1eaft ngang danh ngh\u0129a<\/td>\n\u0110i\u1ec1u 5, 9.1<\/td>\n<\/tr>\n
\n

c<\/p>\n<\/td>\n

\n

mm<\/p>\n<\/td>\n

B\u01b0\u1edbc g\u00e2n<\/td>\n4.11, \u0110i\u1ec1u 6<\/td>\n<\/tr>\n
\n

d<\/p>\n<\/td>\n

\n

mm<\/p>\n<\/td>\n

\u0110\u01b0\u1eddng k\u00ednh danh ngh\u0129a c\u1ee7a thanh<\/td>\n\u0110i\u1ec1u 5, \u0110i\u1ec1u 6, 9.1, 9.2, 9.3, \u0110i\u1ec1u 10, 11.2<\/td>\n<\/tr>\n
\n

<\/p>\n<\/td>\n

\n

mm<\/p>\n<\/td>\n

Chu vi g\u00e2n<\/td>\n4.12, \u0110i\u1ec1u 6<\/td>\n<\/tr>\n
\n

fk<\/sub><\/p>\n<\/td>\n

\n

–<\/p>\n<\/td>\n

Gi\u00e1 tr\u1ecb \u0111\u1eb7c tr\u01b0ng qui \u0111\u1ecbnh<\/td>\n12.3.2.3<\/td>\n<\/tr>\n
\n

fR<\/sub><\/p>\n<\/td>\n

\n

–<\/p>\n<\/td>\n

Di\u1ec7n t\u00edch g\u00e2n t\u01b0\u01a1ng \u0111\u1ed1i<\/td>\n4.9, \u0110i\u1ec1u 6<\/td>\n<\/tr>\n
\n

k, k\u2019<\/p>\n<\/td>\n

\n

–<\/p>\n<\/td>\n

Ch\u1ec9 s\u1ed1 so s\u00e1nh<\/td>\n12.3.2.3.1<\/td>\n<\/tr>\n
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mn<\/sub><\/p>\n<\/td>\n

\n

–<\/p>\n<\/td>\n

Gi\u00e1 tr\u1ecb trung b\u00ecnh c\u1ee7a n gi\u00e1 tr\u1ecb ri\u00eang<\/td>\n12.3.2.3.1<\/td>\n<\/tr>\n
\n

n<\/p>\n<\/td>\n

\n

–<\/p>\n<\/td>\n

S\u1ed1 gi\u00e1 tr\u1ecb ri\u00eang<\/td>\n12.3.2.3.1<\/td>\n<\/tr>\n
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ReH<\/sub><\/p>\n<\/td>\n

\n

MPa<\/p>\n<\/td>\n

Gi\u1edbi h\u1ea1n ch\u1ea3y tr\u00ean<\/td>\n8.1<\/td>\n<\/tr>\n
\n

Rm<\/sub><\/p>\n<\/td>\n

\n

MPa<\/p>\n<\/td>\n

Gi\u1edbi h\u1ea1n b\u1ec1n k\u00e9o<\/td>\n8.1<\/td>\n<\/tr>\n
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Rp0,2<\/sub><\/p>\n<\/td>\n

\n

MPa<\/p>\n<\/td>\n

Gi\u1edbi h\u1ea1n ch\u1ea3y qui \u01b0\u1edbc 0,2%, v\u1edbi \u0111\u1ed9 gi\u00e3n d\u00e0i kh\u00f4ng t\u1ef7 l\u1ec7<\/td>\n8.1<\/td>\n<\/tr>\n
\n

Sn<\/sub><\/p>\n<\/td>\n

\n

–<\/p>\n<\/td>\n

\u0110\u1ed9 l\u1ec7ch chu\u1ea9n \u0111\u1ed1i v\u1edbi n gi\u00e1 tr\u1ecb ri\u00eang<\/td>\n12.3.2.3.1<\/td>\n<\/tr>\n
\n

Xi<\/sub><\/p>\n<\/td>\n

\n

–<\/p>\n<\/td>\n

Gi\u00e1 tr\u1ecb ri\u00eang<\/td>\n12.3.2.3.1<\/td>\n<\/tr>\n
\n

<\/p>\n<\/td>\n

\n

\u0111\u1ed9<\/p>\n<\/td>\n

G\u00f3c nghi\u00eang c\u1ea1nh c\u1ee7a g\u00e2n ngang<\/td>\n4.14, \u0110i\u1ec1u 6<\/td>\n<\/tr>\n
\n

<\/p>\n<\/td>\n

\n

\u0111\u1ed9<\/p>\n<\/td>\n

G\u00f3c t\u1ea1o b\u1edfi tr\u1ee5c c\u1ee7a g\u00e2n ngang v\u00e0 tr\u1ee5c thanh th\u00e9p v\u1eb1n<\/td>\n4.15, \u0110i\u1ec1u 6<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

4. Thu\u1eadt ng\u1eef v\u00e0 \u0111\u1ecbnh ngh\u0129a<\/b><\/p>\n

Ti\u00eau chu\u1ea9n n\u00e0y \u00e1p d\u1ee5ng c\u00e1c thu\u1eadt ng\u1eef v\u00e0 \u0111\u1ecbnh ngh\u0129a sau:<\/p>\n

4.1. Ph\u00e2n t\u00edch m\u1ebb n\u1ea5u (Cast analysis)<\/p>\n

Ph\u00e2n t\u00edch th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc c\u1ee7a m\u1eabu \u0111\u1ea1i di\u1ec7n cho m\u1ebb n\u1ea5u do ng\u01b0\u1eddi s\u1ea3n xu\u1ea5t th\u1ef1c hi\u1ec7n theo qui tr\u00ecnh ri\u00eang c\u1ee7a h\u1ecd.<\/p>\n[ISO 16020: 2005]\n

4.2. H\u1ec7 th\u1ed1ng ch\u1ee9ng nh\u1eadn (Certification scheme)<\/p>\n

H\u1ec7 th\u1ed1ng ch\u1ee9ng nh\u1eadn li\u00ean quan \u0111\u1ebfn s\u1ea3n ph\u1ea9m, c\u00e1c qu\u00e1 tr\u00ecnh s\u1ea3n xu\u1ea5t hay d\u1ecbch v\u1ee5 theo nh\u1eefng ti\u00eau chu\u1ea9n v\u00e0 qui \u0111\u1ecbnh ri\u00eang v\u00e0 c\u00f3 c\u00f9ng ph\u01b0\u01a1ng ph\u00e1p ti\u1ebfn h\u00e0nh.<\/p>\n

4.3. Gi\u00e1 tr\u1ecb \u0111\u1eb7c tr\u01b0ng (Characteristic value)<\/p>\n

Gi\u00e1 tr\u1ecb x\u00e1c xu\u1ea5t qui \u0111\u1ecbnh v\u1edbi gi\u1ea3 thi\u1ebft s\u1ed1 l\u1ea7n th\u1eed l\u00e0 v\u00f4 h\u1ea1n<\/p>\n[ISO 16020: 2005]\n

CH\u00da TH\u00cdCH 1: T\u01b0\u01a1ng \u0111\u01b0\u01a1ng v\u1edbi \u201cv\u00f9ng ph\u00e2n b\u1ed1\u201d \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a trong ISO 3534-1.<\/p>\n

CH\u00da TH\u00cdCH 2: Gi\u00e1 tr\u1ecb danh ngh\u0129a \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng nh\u01b0 gi\u00e1 tr\u1ecb \u0111\u1eb7c tr\u01b0ng trong m\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p.<\/p>\n

4.4. L\u00f5i (Core)<\/p>\n

Ph\u1ea7n m\u1eb7t c\u1eaft ngang c\u1ee7a thanh kh\u00f4ng ch\u1ee9a c\u00e1c g\u00e2n d\u1ecdc c\u0169ng nh\u01b0 c\u00e1c g\u00e2n ngang<\/p>\n

CH\u00da TH\u00cdCH: Ph\u00f9 h\u1ee3p v\u1edbi ISO 16020:2005.<\/p>\n

4.5. C\u1ea5p \u0111\u1ed9 d\u1ebbo<\/p>\n

S\u1ef1 ph\u00e2n lo\u1ea1i c\u00e1c t\u00ednh ch\u1ea5t d\u1ebbo c\u1ee7a th\u00e9p l\u00e0m c\u1ed1t b\u00ea t\u00f4ng c\u0103n c\u1ee9 v\u00e0o gi\u00e1 tr\u1ecb v\u1ec1 t\u1ef7 l\u1ec7 gi\u1edbi h\u1ea1n b\u1ec1n k\u00e9o v\u1edbi gi\u1edbi h\u1ea1n ch\u1ea3y c\u0169ng nh\u01b0 \u0111\u1ed9 gi\u00e3n d\u00e0i \u0111\u01b0\u1ee3c \u0111o b\u1eb1ng Agt<\/sub>\u00a0ho\u1eb7c A5<\/sub>.<\/p>\n

CH\u00da TH\u00cdCH: Xem B\u1ea3ng 6.<\/p>\n

4.6. G\u00e2n d\u1ecdc (Longitudinal rib)<\/p>\n

G\u00e2n li\u00ean t\u1ee5c \u0111\u1ec1u \u0111\u1eb7n song song v\u1edbi tr\u1ee5c c\u1ee7a thanh<\/p>\n

CH\u00da TH\u00cdCH: Ph\u00f9 h\u1ee3p v\u1edbi ISO 16020: 2005.<\/p>\n

4.7. Di\u1ec7n t\u00edch m\u1eb7t c\u1eaft ngang danh ngh\u0129a (Nominal cross \u2013 sectional area)<\/p>\n

Di\u1ec7n t\u00edch m\u1eb7t c\u1eaft ngang t\u01b0\u01a1ng \u0111\u01b0\u01a1ng v\u1edbi di\u1ec7n t\u00edch c\u1ee7a m\u1ed9t thanh tr\u00f2n tr\u01a1n c\u00f3 c\u00f9ng \u0111\u01b0\u1eddng k\u00ednh danh ngh\u0129a<\/p>\n

CH\u00da TH\u00cdCH: Ph\u00f9 h\u1ee3p v\u1edbi ISO 16020: 2005.<\/p>\n

4.8. Ph\u00e2n t\u00edch s\u1ea3n ph\u1ea9m (Product analysis)<\/p>\n

Ph\u00e2n t\u00edch th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc \u0111\u01b0\u1ee3c ti\u1ebfn h\u00e0nh tr\u00ean s\u1ea3n ph\u1ea9m<\/p>\n[ISO 16020: 2005]\n

4.9. Di\u1ec7n t\u00edch g\u00e2n t\u01b0\u01a1ng \u0111\u1ed1i (Relative rib area)<\/p>\n

fR<\/sub><\/p>\n

Di\u1ec7n t\u00edch c\u1ee7a t\u1ea5t c\u1ea3 c\u00e1c g\u00e2n ngang trong m\u1ed9t chi\u1ec1u d\u00e0i \u0111\u00e3 x\u00e1c \u0111\u1ecbnh tr\u00ean b\u1ec1 m\u1eb7t vu\u00f4ng g\u00f3c v\u1edbi tr\u1ee5c d\u1ecdc c\u1ee7a thanh th\u00e9p, chia cho chi\u1ec1u d\u00e0i n\u00e0y v\u00e0 chu vi danh ngh\u0129a.<\/p>\n

CH\u00da TH\u00cdCH: Ph\u00f9 h\u1ee3p v\u1edbi ISO 16020: 2005.<\/p>\n

4.10. Chi\u1ec1u cao g\u00e2n (Rib height)<\/p>\n

a<\/p>\n

Kho\u1ea3ng c\u00e1ch t\u1eeb \u0111i\u1ec3m cao nh\u1ea5t c\u1ee7a g\u00e2n \u0111\u1ebfn b\u1ec1 m\u1eb7t c\u1ee7a l\u00f5i \u0111\u01b0\u1ee3c \u0111o theo ph\u01b0\u01a1ng vu\u00f4ng g\u00f3c v\u1edbi tr\u1ee5c c\u1ee7a thanh th\u00e9p<\/p>\n

CH\u00da TH\u00cdCH 1: Xem H\u00ecnh 2.<\/p>\n

CH\u00da TH\u00cdCH 2: Ph\u00f9 h\u1ee3p v\u1edbi ISO 16020: 2005.<\/p>\n

4.11. B\u01b0\u1edbc g\u00e2n (Rib spacing)<\/p>\n

c<\/p>\n

Kho\u1ea3ng c\u00e1ch gi\u1eefa c\u00e1c t\u00e2m c\u1ee7a hai g\u00e2n ngang k\u1ec1 nhau \u0111\u01b0\u1ee3c \u0111o song song v\u1edbi tr\u1ee5c c\u1ee7a thanh<\/p>\n

CH\u00da TH\u00cdCH 1: Xem H\u00ecnh 1.<\/p>\n

CH\u00da TH\u00cdCH: 2: Ph\u00f9 h\u1ee3p v\u1edbi ISO 16020: 2005.<\/p>\n

4.12. Chu vi kh\u00f4ng c\u00f3 g\u00e2n (Ribless perimeter)<\/p>\n

<\/p>\n

T\u1ed5ng c\u00e1c kho\u1ea3ng c\u00e1ch d\u1ecdc theo b\u1ec1 m\u1eb7t l\u00f5i gi\u1eefa c\u00e1c \u0111i\u1ec3m cu\u1ed1i c\u1ee7a g\u00e2n ngang c\u00e1c h\u00e0ng k\u1ec1 nhau \u0111\u01b0\u1ee3c \u0111o nh\u01b0 l\u00e0 h\u00ecnh chi\u1ebfu l\u00ean m\u1eb7t ph\u1eb3ng vu\u00f4ng g\u1ed1c v\u1edbi tr\u1ee5c c\u1ee7a thanh<\/p>\n

CH\u00da TH\u00cdCH: Ph\u00f9 h\u1ee3p v\u1edbi ISO 16020: 2005.<\/p>\n

4.13. G\u00e2n ngang (Transverse rib)<\/p>\n

Ph\u1ea7n l\u1ed3i l\u00ean c\u1ee7a thanh vu\u00f4ng g\u00f3c ho\u1eb7c xi\u00ean g\u00f3c so v\u1edbi tr\u1ee5c d\u1ecdc c\u1ee7a thanh<\/p>\n

CH\u00da TH\u00cdCH: Ph\u00f9 h\u1ee3p v\u1edbi ISO 16020: 2005.<\/p>\n

4.14. \u0110\u1ed9 nghi\u00eang c\u1ea1nh c\u1ee7a g\u00e2n ngang (Transverse-rib flank inclination)<\/p>\n

a<\/p>\n

G\u00f3c gi\u1eefa m\u1eb7t b\u00ean c\u1ee7a m\u1ed9t g\u00e2n ngang v\u00e0 b\u1ec1 m\u1eb7t l\u00f5i c\u1ee7a thanh \u0111\u01b0\u1ee3c \u0111o tr\u00ean m\u1eb7t c\u1eaft vu\u00f4ng g\u00f3c v\u1edbi tr\u1ee5c d\u1ecdc c\u1ee7a g\u00e2n ngang.<\/p>\n

CH\u00da TH\u00cdCH 1: Xem H\u00ecnh 2.<\/p>\n

CH\u00da TH\u00cdCH 2: Ph\u00f9 h\u1ee3p v\u1edbi ISO 16020: 2005.<\/p>\n

4.15. \u0110\u1ed9 nghi\u00eang c\u1ee7a g\u00e2n ngang (Transverse-rib inclination)<\/p>\n

<\/p>\n

G\u00f3c gi\u1eefa g\u00e2n ngang v\u00e0 tr\u1ee5c d\u1ecdc c\u1ee7a thanh<\/p>\n

CH\u00da TH\u00cdCH 1: Xem H\u00ecnh 1, 3 v\u00e0 4.<\/p>\n

CH\u00da TH\u00cdCH 2: Ph\u00f9 h\u1ee3p v\u1edbi ISO 16020: 2005.<\/p>\n

5. K\u00edch th\u01b0\u1edbc, kh\u1ed1i l\u01b0\u1ee3ng 1 m chi\u1ec1u d\u00e0i v\u00e0 sai l\u1ec7ch cho ph\u00e9p<\/b><\/p>\n

Th\u00e9p thanh v\u1eb1n c\u00f3 \u0111\u01b0\u1eddng k\u00ednh danh ngh\u0129a \u0111\u1ebfn 10mm \u0111\u01b0\u1ee3c cung c\u1ea5p d\u01b0\u1edbi d\u1ea1ng cu\u1ed9n ho\u1eb7c thanh, l\u1edbn h\u01a1n 10mm \u0111\u01b0\u1ee3c cung c\u1ea5p d\u01b0\u1edbi d\u1ea1ng thanh.<\/p>\n