{"id":7909,"date":"2021-06-07T07:11:44","date_gmt":"2021-06-07T07:11:44","guid":{"rendered":"https:\/\/thuvienxaydung.com.vn\/?p=7909"},"modified":"2025-03-06T10:31:59","modified_gmt":"2025-03-06T10:31:59","slug":"tieu-chuan-viet-nam-tcvn-1651-12008-thep-cot-be-tong-thep-thanh-tron-tron","status":"publish","type":"post","link":"https:\/\/tailieuxaydung.net\/?p=7909","title":{"rendered":"Ti\u00eau chu\u1ea9n Vi\u1ec7t Nam TCVN 1651-1:2008 Th\u00e9p c\u1ed1t b\u00ea t\u00f4ng – Th\u00e9p thanh tr\u00f2n tr\u01a1n"},"content":{"rendered":"

N\u1ed9i dung to\u00e0n v\u0103n Ti\u00eau chu\u1ea9n Vi\u1ec7t Nam TCVN 1651-1:2008 v\u1ec1 th\u00e9p c\u1ed1t b\u00ea t\u00f4ng – ph\u1ea7n 1: th\u00e9p thanh tr\u00f2n tr\u01a1n do B\u1ed9 Khoa h\u1ecdc v\u00e0 C\u00f4ng ngh\u1ec7 ban h\u00e0nh<\/h2>\n
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TI\u00caU CHU\u1ea8N VI\u1ec6T\u00a0<\/b>NAM<\/b><\/p>\n

TCVN 1651-1:2008<\/b><\/p>\n

TH\u00c9P C\u1ed0T B\u00ca T\u00d4NG<\/p>\n

PH\u1ea6N 1: TH\u00c9P THANH TR\u00d2N TR\u01a0N<\/p>\n

Steel for the reinforcement of concrete \u2013<\/i><\/p>\n

Part 1: Plain bars<\/i><\/p>\n

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

TCVN 1651-1:2008 thay th\u1ebf cho c\u00e1c \u0111i\u1ec1u quy \u0111\u1ecbnh \u0111\u1ed1i v\u1edbi th\u00e9p c\u1ed1t b\u00ea t\u00f4ng nh\u00f3m C1 c\u1ee7a TCVN 1651:1985.<\/p>\n

TCVN 1651-1:2008 \u0111\u01b0\u1ee3c bi\u00ean so\u1ea1n tr\u00ean c\u01a1 s\u1edf ISO 6935-1:2007; JIS 3112:2004 v\u00e0 GB 1499:1998<\/p>\n

TCVN 1651-1:2008 do Ban k\u1ef9 thu\u1eadt ti\u00eau chu\u1ea9n TCVN\/TC 17\u00a0Th\u00e9p<\/i>\u00a0bi\u00ean so\u1ea1n, 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><\/b><\/p>\n

Ti\u00eau chu\u1ea9n n\u00e0y quy \u0111\u1ecbnh y\u00eau c\u1ea7u k\u1ef9 thu\u1eadt cho th\u00e9p thanh tr\u00f2n tr\u01a1n d\u00f9ng l\u00e0m c\u1ed1t b\u00ea t\u00f4ng.<\/p>\n

Ti\u00eau chu\u1ea9n n\u00e0y \u00e1p d\u1ee5ng cho th\u00e9p m\u00e1c CB240T v\u00e0 CB300T. Ph\u01b0\u01a1ng ph\u00e1p s\u1ea3n xu\u1ea5t do nh\u00e0 s\u1ea3n xu\u1ea5t quy\u1ebft \u0111\u1ecbnh.<\/p>\n

<\/div>\n

Ch\u00fa th\u00edch: Ch\u1eef \u201cCB” \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 \u0111\u1eb7c tr\u01b0ng \u0111\u01b0\u1ee3c quy \u0111\u1ecbnh c\u1ee7a gi\u1edbi h\u1ea1n ch\u1ea3y tr\u00ean. K\u00fd hi\u1ec7u cu\u1ed1i c\u00f9ng \u201cT\u201d l\u00e0 vi\u1ebft t\u1eaft c\u1ee7a th\u00e9p thanh tr\u00f2n tr\u01a1n.<\/p>\n

Ti\u00eau chu\u1ea9n n\u00e0y \u00e1p d\u1ee5ng cho c\u00e1c s\u1ea3n ph\u1ea9m \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 th\u00e9p thanh tr\u00f2n tr\u01a1n 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 tr\u00f2n tr\u01a1n \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\u00a0(T\u00ean th\u00e9p d\u1ef1a tr\u00ean c\u00e1c k\u00fd hi\u1ec7u b\u1eb1ng ch\u1eef).<\/i><\/p>\n

ISO\/TR 9769:1991, Steel and iron \u2013 Review of available methods of analysis\u00a0(Th\u00e9p v\u00e0 gang \u2013 T\u1ed5ng quan v\u1ec1 ph\u01b0\u01a1ng ph\u00e1p ph\u00e2n t\u00edch hi\u1ec7n c\u00f3)<\/i><\/p>\n

ISO 10144, Certification scheme for steel bars and wires for the reinforcement of concrete structures\u00a0(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).<\/i><\/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 of 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\u00a0<\/i>Ph\u01b0\u01a1ng ph\u00e1p th\u1eed\u00a0\u00a0– Ph\u1ea7n 1: Th\u00e9p thanh, d\u00e2y th\u1eb3ng v\u00e0 d\u00e2y l\u00e0m c\u1ed1t b\u00ea t\u00f4ng).<\/i><\/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
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K\u00fd hi\u1ec7u<\/p>\n<\/td>\n

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

\n

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

\n

\u0110i\u1ec1u vi\u1ec7n d\u1eabn<\/p>\n<\/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>\n7.1, 8.1<\/td>\n<\/tr>\n
\n

A\u00adgt<\/sub><\/p>\n<\/td>\n

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

\u0110\u1ed9 d\u00e3n d\u00e0i t\u1ed5ng \u1ee9ng v\u1edbi l\u1ef1c l\u1edbn nh\u1ea5t<\/td>\n7.1, 8.1<\/td>\n<\/tr>\n
\n

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

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

Di\u1ec7n t\u00edch m\u1eb7t c\u1eaft ngang danh ngh\u0129a<\/td>\n\u0110i\u1ec1u 5, 8.1<\/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, 8.1, 8.2, \u0110i\u1ec1u 9<\/td>\n<\/tr>\n
\n

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

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–<\/p>\n<\/td>\n

Gi\u00e1 tr\u1ecb \u0111\u1eb7c tr\u01b0ng quy \u0111\u1ecbnh<\/td>\n11.3.2.3.1<\/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>\n11.3.2.3.1<\/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>\n11.3.2.3.1<\/td>\n<\/tr>\n
\n

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

\n

–<\/p>\n<\/td>\n

S\u1ed1 gi\u00e1 tr\u1ecb ri\u00eang<\/td>\n11.3.2.3.1<\/td>\n<\/tr>\n
\n

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

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

Gi\u1edbi h\u1ea1n ch\u1ea3y tr\u00ean<\/td>\n7.1<\/td>\n<\/tr>\n
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Rm<\/sub><\/p>\n<\/td>\n

\n

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

Gi\u1edbi h\u1ea1n b\u1ec1n k\u00e9o<\/td>\n7.1<\/td>\n<\/tr>\n
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Rp0,2<\/sub><\/p>\n<\/td>\n

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

Gi\u1edbi h\u1ea1n ch\u1ea3y quy \u01b0\u1edbc 0,2%, v\u1edbi \u0111\u1ed9 gi\u00e3n d\u00e0i kh\u00f4ng t\u1ef7 l\u1ec7<\/td>\n7.1<\/td>\n<\/tr>\n
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Sn<\/sub><\/p>\n<\/td>\n

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–<\/p>\n<\/td>\n

\u0110\u1ed9 l\u1ec7ch chu\u1ea9n \u0111\u1ed1i v\u1edbi n gi\u00e1 tr\u1ecb ri\u00eang<\/td>\n11.3.2.3.1<\/td>\n<\/tr>\n
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Xi<\/sub><\/p>\n<\/td>\n

\n

–<\/p>\n<\/td>\n

Gi\u00e1 tr\u1ecb ri\u00eang<\/td>\n11.3.2.3.1<\/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\u00a0<\/b>(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 nh\u00e0 s\u1ea3n xu\u1ea5t th\u1ef1c hi\u1ec7n theo quy tr\u00ecnh ri\u00eang c\u1ee7a h\u1ecd<\/p>\n[ISO 16020:2005]\n

4.2. H\u1ec7 th\u1ed1ng ch\u1ee9ng nh\u1eadn<\/b>\u00a0(Certification scheme)<\/p>\n

H\u1ec7 th\u1ed1ng ch\u1ee9ng nh\u1eadn li\u00ean quan \u0111\u1ebfn c\u00e1c 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 quy \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\u00a0<\/b>(Characteristic value)<\/p>\n

Gi\u00e1 tr\u1ecb x\u00e1c su\u1ea5t quy \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 \u1ee9ng 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. C\u1ea5p \u0111\u1ed9 d\u1ebbo\u00a0<\/b>(Ductility class)<\/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\u00a0Agt<\/sub>\u00a0<\/i>ho\u1eb7c\u00a0A5<\/sub><\/i>.<\/p>\n

CH\u00da TH\u00cdCH: Xem B\u1ea3ng 5.<\/p>\n

4.5. Ph\u00e2n t\u00edch s\u1ea3n ph\u1ea9m\u00a0<\/b>(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

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 tr\u00f2n tr\u01a1n c\u00f3 \u0111\u01b0\u1eddng k\u00ednh danh ngh\u0129a \u0111\u1ebfn 10 mm \u0111\u01b0\u1ee3c cung c\u1ea5p d\u01b0\u1edbi d\u1ea1ng cu\u1ed9n ho\u1eb7c thanh, l\u1edbn h\u01a1n 10 mm \u0111\u01b0\u1ee3c cung c\u1ea5p d\u01b0\u1edbi d\u1ea1ng thanh.<\/p>\n

<\/div>\n

K\u00edch th\u01b0\u1edbc, kh\u1ed1i l\u01b0\u1ee3ng 1 m chi\u1ec1u d\u00e0i v\u00e0 sai l\u1ec7ch cho ph\u00e9p \u0111\u01b0\u1ee3c n\u00eau trong B\u1ea3ng 2. Theo th\u1ecfa thu\u1eadn gi\u1eefa nh\u00e0 s\u1ea3n xu\u1ea5t v\u00e0 ng\u01b0\u1eddi mua, c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng c\u00e1c thanh th\u00e9p tr\u00f2n tr\u01a1n c\u00f3 \u0111\u01b0\u1eddng k\u00ednh danh ngh\u0129a kh\u00e1c v\u1edbi\u00a0\u0111\u01b0\u1eddng k\u00ednh n\u00eau trong B\u1ea3ng 2. Khi c\u00f3 s\u1ef1 th\u1ecfa thu\u1eadn gi\u1eefa nh\u00e0 s\u1ea3n xu\u1ea5t v\u00e0 ng\u01b0\u1eddi mua sai l\u1ec7ch cho ph\u00e9p v\u1ec1 kh\u1ed1i l\u01b0\u1ee3ng theo chi\u1ec1u d\u00e0i c\u00f3 th\u1ec3\u00a0<\/i>\u0111\u01b0\u1ee3c thay th\u1ebf b\u1eb1ng dung sai \u0111\u01b0\u1eddng k\u00ednh.<\/p>\n

Chi\u1ec1u d\u00e0i cung c\u1ea5p ph\u1ea3i \u0111\u01b0\u1ee3c th\u1ecfa thu\u1eadn gi\u1eefa nh\u00e0 s\u1ea3n xu\u1ea5t v\u00e0 ng\u01b0\u1eddi mua. Chi\u1ec1u d\u00e0i cung c\u1ea5p c\u1ee7a c\u00e1c thanh \u0111\u01b0\u1ee3c \u01b0u ti\u00ean l\u00e0 6 m ho\u1eb7c 12 m. N\u1ebfu kh\u00f4ng c\u00f3 s\u1ef1 th\u1ecfa thu\u1eadn kh\u00e1c, th\u00ec sai l\u1ec7ch cho ph\u00e9p c\u1ee7a chi\u1ec1u d\u00e0i cung c\u1ea5p t\u1eeb x\u01b0\u1edfng c\u00e1n l\u00e0\u00a0mm.<\/p>\n

B\u1ea3ng 2. 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\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\n

\u0110\u01b0\u1eddng k\u00ednh thanh danh ngh\u0129a<\/b><\/p>\n

d<\/i><\/p>\n

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

\n

Di\u1ec7n t\u00edch m\u1eb7t c\u1eaft ngang danh ngh\u0129a\u00a0a<\/sup><\/b><\/p>\n

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

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

\n

Kh\u1ed1i l\u01b0\u1ee3ng 1 m chi\u1ec1u d\u00e0i<\/b><\/p>\n<\/td>\n<\/tr>\n

\n

Y\u00eau c\u1ea7u\u00a0b<\/sup><\/b><\/p>\n

kg\/m<\/b><\/p>\n<\/td>\n

\n

Sai l\u1ec7ch cho ph\u00e9p\u00a0c<\/sup><\/b><\/p>\n

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

\n

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

\n

28,3<\/p>\n<\/td>\n

\n

0,222<\/p>\n<\/td>\n

\n

\u00b18<\/p>\n<\/td>\n<\/tr>\n

\n

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

\n

50,3<\/p>\n<\/td>\n

\n

0,395<\/p>\n<\/td>\n

\n

\u00b18<\/p>\n<\/td>\n<\/tr>\n

\n

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

\n

78,5<\/p>\n<\/td>\n

\n

0,617<\/p>\n<\/td>\n

\n

\u00b16<\/p>\n<\/td>\n<\/tr>\n

\n

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

\n

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

\n

0,888<\/p>\n<\/td>\n

\n

\u00b16<\/p>\n<\/td>\n<\/tr>\n

\n

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

\n

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

\n

1,21<\/p>\n<\/td>\n

\n

\u00b15<\/p>\n<\/td>\n<\/tr>\n

\n

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

\n

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

\n

1,58<\/p>\n<\/td>\n

\n

\u00b15<\/p>\n<\/td>\n<\/tr>\n

\n

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

\n

254,5<\/p>\n<\/td>\n

\n

2,00<\/p>\n<\/td>\n

\n

\u00b15<\/p>\n<\/td>\n<\/tr>\n

\n

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

\n

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

\n

2,47<\/p>\n<\/td>\n

\n

\u00b15<\/p>\n<\/td>\n<\/tr>\n

\n

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

\n

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

\n

2,98<\/p>\n<\/td>\n

\n

\u00b15<\/p>\n<\/td>\n<\/tr>\n

\n

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

\n

490,9<\/p>\n<\/td>\n

\n

3,85<\/p>\n<\/td>\n

\n

\u00b14<\/p>\n<\/td>\n<\/tr>\n

\n

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

\n

615,8<\/p>\n<\/td>\n

\n

4,83<\/p>\n<\/td>\n

\n

\u00b14<\/p>\n<\/td>\n<\/tr>\n

\n

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

\n

804,2<\/p>\n<\/td>\n

\n

6,31<\/p>\n<\/td>\n

\n

\u00b14<\/p>\n<\/td>\n<\/tr>\n

\n

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

\n

1017,9<\/p>\n<\/td>\n

\n

7,99<\/p>\n<\/td>\n

\n

\u00b14<\/p>\n<\/td>\n<\/tr>\n

\n

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

\n

1256,6<\/p>\n<\/td>\n

\n

9,86<\/p>\n<\/td>\n

\n

\u00b14<\/p>\n<\/td>\n<\/tr>\n

a<\/sup>\u00a0An<\/sub>\u00a0<\/i>= 0,7854 x d2<\/sup><\/p>\n

b<\/sup>\u00a0Kh\u1ed1i l\u01b0\u1ee3ng theo chi\u1ec1u d\u00e0i = 7,85 x 10-3<\/sup>\u00a0x\u00a0An<\/sub><\/i><\/p>\n

c<\/sup>\u00a0Sai s\u1ed1 cho ph\u00e9p \u0111\u1ed1i v\u1edbi m\u1ed9t thanh \u0111\u01a1n.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

6. Th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc<\/b><\/p>\n

Th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc c\u1ee7a th\u00e9p, \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1eb1ng ph\u00e2n t\u00edch \u0111\u00fac, ph\u1ea3i ph\u00f9 h\u1ee3p v\u1edbi B\u1ea3ng 3.<\/p>\n

S\u1ef1 sai kh\u00e1c c\u1ee7a vi\u1ec7c ph\u00e2n t\u00edch s\u1ea3n ph\u1ea9m li\u00ean quan \u0111\u1ebfn vi\u1ec7c ph\u00e2n t\u00edch \u0111\u00fac \u0111\u01b0\u1ee3c quy \u0111\u1ecbnh trong v\u00e0 n\u00eau trong B\u1ea3ng 4.<\/p>\n

<\/div>\n

B\u1ea3ng 3 \u2013 Th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc d\u1ef1a v\u00e0o ph\u00e2n t\u00edch m\u1ebb n\u1ea5u \u2013 Gi\u00e1 tr\u1ecb l\u1edbn nh\u1ea5t t\u00ednh b\u1eb1ng ph\u1ea7n tr\u0103m kh\u1ed1i l\u01b0\u1ee3ng<\/b><\/p>\n\n\n\n\n
\n

M\u00e1c th\u00e9p<\/p>\n<\/td>\n

\n

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

\n

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

\n

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

\n

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

\n

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

\n

N<\/p>\n<\/td>\n<\/tr>\n

CB240-T<\/p>\n

CB300-T<\/td>\n

\n

–<\/p>\n<\/td>\n

\n

–<\/p>\n<\/td>\n

\n

–<\/p>\n<\/td>\n

\n

0,050<\/p>\n<\/td>\n

\n

0,050<\/p>\n<\/td>\n

\n

–<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

B\u1ea3ng 4 \u2013 Th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc d\u1ef1a v\u00e0o ph\u00e2n t\u00edch s\u1ea3n ph\u1ea9m \u2013 Sai s\u1ed1 cho ph\u00e9p c\u1ee7a ph\u00e2n t\u00edch s\u1ea3n ph\u1ea9m t\u00ednh theo ph\u1ea7n tr\u0103m kh\u1ed1i l\u01b0\u1ee3ng<\/b><\/p>\n\n\n\n\n\n
\n

C\u00e1c nguy\u00ean t\u1ed1<\/p>\n<\/td>\n

\n

Gi\u00e1 tr\u1ecb l\u1edbn nh\u1ea5t quy \u0111\u1ecbnh trong ph\u00e2n t\u00edch t\u1ea1i B\u1ea3ng 3<\/p>\n

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

\n

Sai s\u1ed1 cho ph\u00e9p c\u1ee7a ph\u00e2n t\u00edch s\u1ea3n ph\u1ea9m t\u1eeb c\u00e1c gi\u1edbi h\u1ea1n quy \u0111\u1ecbnh c\u1ee7a ph\u00e2n t\u00edch \u0111\u00fac t\u1ea1i B\u1ea3ng 3<\/p>\n

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

\n

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

\n

\u2264 0,05<\/p>\n<\/td>\n

\n

+ 0,008<\/p>\n<\/td>\n<\/tr>\n

\n

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

\n

\u2264 0,05<\/p>\n<\/td>\n

\n

+ 0,008<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

7. C\u01a1 t\u00ednh<\/b><\/p>\n

7.1. \u0110\u1ed9 b\u1ec1n k\u00e9o<\/b><\/p>\n

Vi\u1ec7c th\u1eed k\u00e9o ph\u1ea3i \u0111\u01b0\u1ee3c ti\u1ebfn h\u00e0nh ph\u00f9 h\u1ee3p v\u1edbi 8.1.<\/p>\n

V\u1eadt li\u1ec7u ph\u1ea3i ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c y\u00eau c\u1ea7u v\u1ec1 \u0111\u1eb7c t\u00ednh \u0111\u1ed9 b\u1ec1n k\u00e9o quy \u0111\u1ecbnh trong B\u1ea3ng 5.<\/p>\n

Trong ti\u00eau chu\u1ea9n n\u00e0y (n\u1ebfu kh\u00f4ng c\u00f3 gi\u00e1 tr\u1ecb n\u00e0o kh\u00e1c), gi\u00e1 tr\u1ecb \u0111\u1eb7c tr\u01b0ng l\u00e0 gi\u1edbi h\u1ea1n d\u01b0\u1edbi hay gi\u1edbi h\u1ea1n tr\u00ean m\u00e0 90% (1 \u2013\u00a0a\u00a0= 0,90) c\u00e1c tr\u01b0\u1eddng h\u1ee3p c\u00f3 95% (p = 0,95) c\u00e1c gi\u00e1 tr\u1ecb t\u01b0\u01a1ng \u1ee9ng l\u1edbn h\u01a1n ho\u1eb7c b\u1eb1ng gi\u1edbi h\u1ea1n d\u01b0\u1edbi, hay nh\u1ecf h\u01a1n ho\u1eb7c b\u1eb1ng gi\u1edbi h\u1ea1n tr\u00ean. \u0110\u1ecbnh ngh\u0129a n\u00e0y l\u00e0 m\u1ee9c ch\u1ea5t l\u01b0\u1ee3ng d\u00e0i h\u1ea1n c\u1ee7a s\u1ea3n xu\u1ea5t.<\/p>\n

N\u1ebfu kh\u00f4ng xu\u1ea5t hi\u1ec7n hi\u1ec7n t\u01b0\u1ee3ng ch\u1ea3y, gi\u1edbi h\u1ea1n ch\u1ea3y qui \u01b0\u1edbc 0,2% (Rp0,2<\/sub>) ph\u1ea3i \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh<\/p>\n

7.2. T\u00ednh u\u1ed1n<\/b><\/p>\n

Sau khi th\u1eed theo 8.2, c\u00e1c thanh th\u00e9p kh\u00f4ng \u0111\u01b0\u1ee3c g\u00e3y, r\u1ea1n n\u1ee9t c\u00f3 th\u1ec3 nh\u00ecn th\u1ea5y b\u1eb1ng m\u1eaft th\u01b0\u1eddng.<\/p>\n

B\u1ea3ng 5 \u2013 \u0110\u1ed9 b\u1ec1n k\u00e9o<\/b><\/p>\n\n\n\n\n\n\n\n
\n

Lo\u1ea1i th\u00e9p<\/p>\n<\/td>\n

\n

Gi\u00e1 tr\u1ecb quy \u0111\u1ecbnh c\u1ee7a gi\u1edbi h\u1ea1n ch\u1ea3y tr\u00ean\u00a0ReH<\/sub><\/i><\/p>\n

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

\n

Gi\u00e1 tr\u1ecb quy \u0111\u1ecbnh c\u1ee7a gi\u1edbi h\u1ea1n b\u1ec1n k\u00e9o<\/p>\n

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

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

\n

T\u00ednh ch\u1ea5t d\u1ebbo<\/p>\n<\/td>\n<\/tr>\n

\n

Gi\u00e1 tr\u1ecb quy \u0111\u1ecbnh c\u1ee7a<\/p>\n

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

\n

Gi\u00e1 tr\u1ecb quy \u0111\u1ecbnh c\u1ee7a \u0111\u1ed9 gi\u00e3n d\u00e0i<\/p>\n

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

\n

Nh\u1ecf nh\u1ea5t<\/p>\n<\/td>\n

\n

Nh\u1ecf nh\u1ea5t<\/p>\n<\/td>\n

\n

Nh\u1ecf nh\u1ea5t<\/p>\n<\/td>\n

\n

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

Nh\u1ecf nh\u1ea5t<\/p>\n<\/td>\n

\n

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

Nh\u1ecf nh\u1ea5t<\/p>\n<\/td>\n<\/tr>\n

CB240-T<\/td>\n\n

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

\n

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

\n

1,46<\/p>\n<\/td>\n

\n

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

\n

2<\/p>\n<\/td>\n<\/tr>\n

CB300-T<\/td>\n\n

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

\n

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

\n

16<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

8. Th\u1eed nghi\u1ec7m<\/b><\/p>\n

8.1. Th\u1eed k\u00e9o<\/b><\/p>\n

Th\u1eed k\u00e9o \u0111\u01b0\u1ee3c ti\u1ebfn h\u00e0nh ph\u00f9 h\u1ee3p v\u1edbi ISO 15630-1.<\/p>\n

\u0110\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111\u1ed9 gi\u00e3n d\u00e0i sau khi \u0111\u1ee9t,\u00a0A5<\/sub><\/i>, chi\u1ec1u d\u00e0i c\u1eef ban \u0111\u1ea7u c\u1ee7a m\u1eabu th\u1eed ph\u1ea3i b\u1eb1ng 5 l\u1ea7n \u0111\u01b0\u1eddng k\u00ednh danh ngh\u0129a<\/p>\n

\u0110\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111\u1ed9 gi\u00e3n d\u00e0i t\u1ed5ng \u1ee9ng v\u1edbi l\u1ef1c l\u1edbn nh\u1ea5t,\u00a0Ag<\/sub><\/i>t<\/sub>, ph\u1ea3i \u0111\u00e1nh d\u1ea5u c\u00e1c kho\u1ea3ng c\u00e1ch b\u1eb1ng nhau tr\u00ean chi\u1ec1u d\u00e0i b\u1ea5t k\u1ef3 c\u1ee7a m\u1eabu th\u1eed. Kho\u1ea3ng c\u00e1ch gi\u1eefa c\u00e1c d\u1ea5u l\u00e0 20 mm, 10 mm ho\u1eb7c 5 mm t\u00f9y thu\u1ed9c v\u00e0o \u0111\u01b0\u1eddng k\u00ednh thanh th\u00e9p.<\/p>\n

\u0110\u1ec3 x\u00e1c \u0111\u1ecbnh c\u00e1c t\u00ednh ch\u1ea5t k\u00e9o, ph\u1ea3i s\u1eed d\u1ee5ng di\u1ec7n t\u00edch m\u1eb7t c\u1eaft ngang danh ngh\u0129a c\u1ee7a thanh th\u00e9p.<\/p>\n

8.2. Th\u1eed u\u1ed1n<\/b><\/p>\n

Th\u1eed u\u1ed1n \u0111\u01b0\u1ee3c ti\u1ebfn h\u00e0nh ph\u00f9 h\u1ee3p v\u1edbi ISO 15630-1.<\/p>\n

M\u1eabu th\u1eed \u0111\u01b0\u1ee3c u\u1ed1n \u0111\u1ebfn g\u00f3c t\u1eeb 1600<\/sup>\u00a0v\u00e0 1800<\/sup>\u00a0b\u1eb1ng g\u1ed1i u\u1ed1n \u0111\u01b0\u1ee3c quy \u0111\u1ecbnh trong B\u1ea3ng 6.<\/p>\n

B\u1ea3ng 6 \u2013 \u0110\u01b0\u1eddng k\u00ednh g\u1ed1i u\u1ed1n d\u00f9ng cho th\u1eed u\u1ed1n<\/b><\/p>\n

K\u00edch th\u01b0\u1edbc t\u00ednh b\u1eb1ng milim\u00e9t<\/p>\n\n\n\n\n\n
\n

\u0110\u01b0\u1eddng k\u00ednh danh ngh\u0129a<\/b><\/p>\n

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

\n

\u0110\u01b0\u1eddng k\u00ednh g\u1ed1i u\u1ed1n<\/b><\/p>\n

(l\u1edbn nh\u1ea5t)\u00a0a,b<\/sup><\/p>\n<\/td>\n<\/tr>\n

\n

\u2264 40<\/p>\n<\/td>\n

\n

2d<\/i><\/p>\n<\/td>\n<\/tr>\n

a<\/sup>\u00a0N\u1ebfu c\u00f3 s\u1ef1 th\u1ecfa thu\u1eadn gi\u1eefa nh\u00e0 s\u1ea3n xu\u1ea5t v\u00e0 ng\u01b0\u1eddi mua c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng \u0111\u01b0\u1eddng k\u00ednh g\u1edbi u\u1ed1n l\u1edbn h\u01a1n.<\/p>\n

b<\/sup>\u00a0\u0110\u1ed1i v\u1edbi \u0111\u01b0\u1eddng k\u00ednh l\u1edbn h\u01a1n 40 mm, \u0111\u01b0\u1eddng k\u00ednh g\u1ed1i u\u1ed1n trong th\u1eed u\u1ed1n ph\u1ea3i \u0111\u01b0\u1ee3c th\u1ecfa thu\u1eadn gi\u1eefa nh\u00e0 s\u1ea3n xu\u1ea5t v\u00e0 ng\u01b0\u1eddi mua.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

8.3. Th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc<\/b><\/p>\n

Th\u00f4ng th\u01b0\u1eddng, th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1eb1ng c\u00e1c ph\u01b0\u01a1ng ph\u00e1p quang ph\u1ed5.<\/p>\n

Khi c\u00f3 tranh ch\u1ea5p v\u1ec1 ph\u01b0\u01a1ng ph\u00e1p ph\u00e2n t\u00edch, th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc ph\u1ea3i \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p tr\u1ecdng t\u00e0i th\u00edch h\u1ee3p \u0111\u01b0\u1ee3c quy \u0111\u1ecbnh t\u1ea1i m\u1ed9t trong s\u1ed1 c\u00e1c Ti\u00eau chu\u1ea9n qu\u1ed1c t\u1ebf \u0111\u01b0\u1ee3c li\u1ec7t k\u00ea trong ISO\/TR 9769.<\/p>\n

9. K\u00fd hi\u1ec7u qui \u01b0\u1edbc<\/b><\/p>\n

Trong ti\u00eau chu\u1ea9n n\u00e0y, c\u00e1c thanh th\u00e9p tr\u00f2n h\u01a1n ph\u1ea3i \u0111\u01b0\u1ee3c k\u00fd hi\u1ec7u qui \u01b0\u1edbc theo th\u1ee9 t\u1ef1 sau \u0111\u00e2y:<\/p>\n

a) th\u00e9p l\u00e0m c\u1ed1t b\u00ea t\u00f4ng;<\/p>\n

b) s\u1ed1 hi\u1ec7u c\u1ee7a ti\u00eau chu\u1ea9n n\u00e0y;<\/p>\n

c) \u0111\u01b0\u1eddng k\u00ednh danh ngh\u0129a t\u00ednh b\u1eb1ng milim\u00e9t theo B\u1ea3ng 1;<\/p>\n

d) lo\u1ea1i th\u00e9p.<\/p>\n

V\u00cd D\u1ee4: Th\u00e9p c\u1ed1t b\u00ea t\u00f4ng TCVN 1651-1 \u2013 12 CB240-T.<\/p>\n

10. Ghi nh\u00e3n<\/b><\/p>\n

M\u1ed7i b\u00f3 th\u00e9p ph\u1ea3i c\u00f3 m\u1ed9t nh\u00e3n ghi t\u00ean nh\u00e0 s\u1ea3n xu\u1ea5t, s\u1ed1 hi\u1ec7u c\u1ee7a ti\u00eau chu\u1ea9n n\u00e0y, lo\u1ea1i th\u00e9p, \u0111\u01b0\u1eddng k\u00ednh danh ngh\u0129a, s\u1ed1 c\u1ee7a m\u1ebb n\u1ea5u ho\u1eb7c c\u00e1c s\u1ed1 li\u1ec7u li\u00ean quan \u0111\u1ebfn c\u00e1c ph\u00e9p th\u1eed v\u00e0 t\u00ean c\u1ee7a n\u01b0\u1edbc s\u1ea3n xu\u1ea5t.<\/p>\n

11. \u0110\u00e1nh gi\u00e1 s\u1ef1 ph\u00f9 h\u1ee3p<\/b><\/p>\n

11.1. Quy \u0111\u1ecbnh chung<\/b><\/p>\n

Ch\u1ee9ng nh\u1eadn v\u00e0 ki\u1ec3m tra th\u00e9p c\u1ed1t b\u00ea t\u00f4ng ph\u1ea3i \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n:<\/p>\n

a) theo m\u1ed9t h\u1ec7 th\u1ed1ng ch\u1ee9ng nh\u1eadn do m\u1ed9t c\u01a1 quan b\u00ean ngo\u00e0i gi\u00e1m s\u00e1t; ho\u1eb7c<\/p>\n

b) theo m\u1ed9t ph\u00e9p th\u1eed c\u1ee7a vi\u1ec7c cung c\u1ea5p \u0111\u1eb7c bi\u1ec7t.<\/p>\n

11.2. H\u1ec7 th\u1ed1ng ch\u1ee9ng nh\u1eadn<\/b><\/p>\n

Trong tr\u01b0\u1eddng h\u1ee3p theo m\u1ed9t h\u1ec7 th\u1ed1ng ch\u1ee9ng nh\u1eadn th\u00ec vi\u1ec7c ch\u1ee9ng nh\u1eadn v\u00e0 ki\u1ec3m tra ph\u1ea3i \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n theo ISO 10144.<\/p>\n

11.3. Ph\u00e9p th\u1eed ch\u1ea5p nh\u1eadn c\u1ee7a vi\u1ec7c cung c\u1ea5p \u0111\u1eb7c bi\u1ec7t<\/b><\/p>\n

11.3.1. Quy \u0111\u1ecbnh chung<\/b><\/p>\n

C\u00e1c \u0111i\u1ec1u kho\u1ea3n li\u00ean quan \u0111\u1ebfn b\u1ea3n ch\u1ea5t, ph\u1ea1m vi v\u00e0 \u0111\u00e1nh gi\u00e1 c\u1ee7a c\u00e1c ph\u00e9p th\u1eed ch\u1ea5p nh\u1eadn v\u1ec1 vi\u1ec7c cung c\u1ea5p lo\u1ea1i th\u00e9p l\u00e0m c\u1ed1t b\u00ea t\u00f4ng kh\u00f4ng ph\u1ea3i l\u00e0 \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee7a m\u1ed9t h\u1ec7 th\u1ed1ng ch\u1ee9ng nh\u1eadn \u0111\u01b0\u1ee3c n\u00eau t\u1ea1i 11.3.2 v\u00e0 11.3.3.<\/p>\n

Ph\u00e9p th\u1eed ch\u1ea5p nh\u1eadn v\u1ec1 vi\u1ec7c cung c\u1ea5p \u0111\u1eb7c bi\u1ec7t ph\u1ea3i \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n theo 11.3.2.<\/p>\n

Khi c\u00f3 s\u1ef1 th\u1ecfa thu\u1eadn gi\u1eefa nh\u00e0 s\u1ea3n xu\u1ea5t v\u00e0 ng\u01b0\u1eddi mua th\u00ec c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng 11.3.3.<\/p>\n

11.3.2. Th\u1ea9m \u0111\u1ecbnh c\u00e1c gi\u00e1 tr\u1ecb \u0111\u1eb7c tr\u01b0ng<\/b><\/p>\n

11.3.2.1. T\u1ed5 ch\u1ee9c<\/b><\/p>\n

C\u00e1c ph\u00e9p th\u1eed ph\u1ea3i \u0111\u01b0\u1ee3c t\u1ed5 ch\u1ee9c v\u00e0 th\u1ef1c hi\u1ec7n theo s\u1ef1 th\u1ecfa thu\u1eadn gi\u1eefa nh\u00e0 s\u1ea3n xu\u1ea5t v\u00e0 ng\u01b0\u1eddi mua c\u00f3 x\u00e9t \u0111\u1ebfn c\u00e1c quy \u0111\u1ecbnh qu\u1ed1c gia c\u1ee7a n\u01b0\u1edbc mua h\u00e0ng.<\/p>\n

11.3.2.2. Ph\u1ea1m vi l\u1ea5y m\u1eabu v\u00e0 th\u1eed nghi\u1ec7m<\/b><\/p>\n

\u0110\u1ec3 th\u1eed nghi\u1ec7m ph\u1ea3i ph\u00e2n chia l\u00f4 h\u00e0ng cung c\u1ea5p th\u00e0nh c\u00e1c l\u00f4 th\u1eed v\u1edbi kh\u1ed1i l\u01b0\u1ee3ng l\u1edbn nh\u1ea5t l\u00e0 50 t\u1ea5n ho\u1eb7c m\u1ed9t ph\u1ea7n c\u1ee7a n\u00f3. M\u1ed7i m\u1ed9t l\u00f4 th\u1eed ph\u1ea3i bao g\u1ed3m c\u00e1c s\u1ea3n ph\u1ea9m c\u00f9ng m\u1ed9t lo\u1ea1i th\u00e9p v\u00e0 c\u00f9ng \u0111\u01b0\u1eddng k\u00ednh danh ngh\u0129a s\u1eed d\u1ee5ng s\u1ea3n xu\u1ea5t t\u1eeb m\u1ed9t m\u1ebb n\u1ea5u. Nh\u00e0 s\u1ea3n xu\u1ea5t ph\u1ea3i kh\u1eb3ng \u0111\u1ecbnh trong b\u00e1o c\u00e1o th\u1eed r\u1eb1ng t\u1ea5t c\u1ea3 c\u00e1c m\u1eabu th\u1eed trong l\u00f4 th\u1eed \u0111\u01b0\u1ee3c l\u1ea5y t\u1eeb m\u1ebb n\u1ea5u. Th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc (ph\u00e2n t\u00edch m\u1ebb n\u1ea5u) ph\u1ea3i \u0111\u01b0\u1ee3c c\u00f4ng b\u1ed1 trong b\u00e1o c\u00e1o th\u1eed n\u00e0y.<\/p>\n

C\u00e1c m\u1eabu th\u1eed \u0111\u01b0\u1ee3c l\u1ea5y t\u1eeb c\u00e1c l\u00f4 th\u1eed nh\u01b0 sau:<\/p>\n

a) hai m\u1eabu th\u1eed t\u1eeb c\u00e1c thanh kh\u00e1c nhau \u0111\u1ec3 th\u1eed th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc (ph\u00e2n t\u00edch s\u1ea3n ph\u1ea9m);<\/p>\n

b) t\u1ed1i thi\u1ec3u 15 m\u1eabu th\u1eed (n\u1ebfu th\u00edch h\u1ee3p th\u00ec l\u1ea5y 60 m\u1eabu th\u1eed, xem 11.3.2.3.1) t\u1eeb c\u00e1c thanh kh\u00e1c nhau \u0111\u1ec3 th\u1eed t\u1ea5t c\u1ea3 c\u00e1c t\u00ednh ch\u1ea5t kh\u00e1c \u0111\u01b0\u1ee3c quy \u0111\u1ecbnh trong ti\u00eau chu\u1ea9n n\u00e0y.<\/p>\n

11.3.2.3. \u0110\u00e1nh gi\u00e1 c\u00e1c k\u1ebft qu\u1ea3<\/b><\/p>\n

11.3.2.3.1. Ki\u1ec3m tra theo d\u1ea5u hi\u1ec7u \u0111\u1ecbnh l\u01b0\u1ee3ng<\/b><\/p>\n

\u0110\u1ed1i v\u1edbi c\u00e1c t\u00ednh ch\u1ea5t \u0111\u01b0\u1ee3c quy \u0111\u1ecbnh l\u00e0 c\u00e1c gi\u00e1 tr\u1ecb \u0111\u1eb7c tr\u01b0ng th\u00ec ph\u1ea3i x\u00e1c \u0111\u1ecbnh nh\u1eefng gi\u00e1 tr\u1ecb sau:<\/p>\n

a) t\u1ea5t c\u1ea3 c\u00e1c gi\u00e1 tr\u1ecb ri\u00eang,\u00a0xi<\/sub><\/i>\u00a0c\u1ee7a 15 m\u1eabu th\u1eed (n =\u00a0<\/i>15)<\/p>\n

b) gi\u00e1 tr\u1ecb trung b\u00ecnh,\u00a0m15<\/sub><\/i>\u00a0(v\u1edbi\u00a0n =\u00a0<\/i>15);<\/p>\n

c) sai l\u1ec7ch chu\u1ea9n, s15<\/sub><\/i>\u00a0(v\u1edbi\u00a0n =\u00a0<\/i>15).<\/p>\n

L\u00f4 th\u1eed ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c y\u00eau c\u1ea7u n\u1ebfu \u0111i\u1ec1u ki\u1ec7n n\u00eau d\u01b0\u1edbi \u0111\u00e2y th\u1ecfa m\u00e3n t\u1ea5t c\u1ea3 c\u00e1c t\u00ednh ch\u1ea5t.<\/p>\n

m15<\/sub><\/i>\u00a0<\/sub>\u2013 2,33 x\u00a0s15<\/sub>\u00a0<\/i>\u2265 fk<\/sub>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 (1)<\/p>\n

trong \u0111\u00f3<\/p>\n

fk<\/sub>\u00a0l\u00e0 gi\u00e1 tr\u1ecb \u0111\u1eb7c tr\u01b0ng quy \u0111\u1ecbnh;<\/p>\n

2,33 l\u00e0 gi\u00e1 tr\u1ecb c\u1ee7a ch\u1ec9 s\u1ed1 ch\u1ea5p nh\u1eadn k, v\u1edbi n = 15 v\u00e0 t\u1ef7 l\u1ec7 h\u1ecfng 5% (p<\/i>\u00a0= 0,95) v\u1edbi x\u00e1c su\u1ea5t 90% (1 \u2013\u00a0a\u00a0= 0,90).<\/p>\n

S15\u00ad<\/sub><\/i>\u00a0=\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 (2)<\/p>\n

N\u1ebfu \u0111i\u1ec1u ki\u1ec7n n\u00eau tr\u00ean kh\u00f4ng \u0111\u01b0\u1ee3c th\u1ecfa m\u00e3n th\u00ec ch\u1ec9 s\u1ed1<\/p>\n

k\u2019<\/i>\u00a0=\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 (3)<\/p>\n

\u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh t\u1eeb c\u00e1c k\u1ebft qu\u1ea3 th\u1eed s\u1eb5n c\u00f3. N\u1ebfu\u00a0k\u2019<\/i>\u00a0\u2265 2 th\u00ec ph\u00e9p th\u1eed c\u00f3 th\u1ec3 ti\u1ebfp t\u1ee5c. Trong tr\u01b0\u1eddng h\u1ee3p n\u00e0y ph\u1ea3i th\u1eed 45 m\u1eabu ti\u1ebfp theo l\u1ea5y t\u1eeb c\u00e1c thanh kh\u00e1c nhau trong l\u00f4 th\u1eed, nh\u01b0 v\u1eady c\u00f3 t\u1ed5ng s\u1ed1 60 k\u1ebft qu\u1ea3 th\u1eed\u00a0(n = 60)<\/i>.<\/p>\n

L\u00f4 th\u1eed \u0111\u01b0\u1ee3c coi l\u00e0 th\u1ecfa m\u00e3n c\u00e1c y\u00eau c\u1ea7u n\u1ebfu \u0111i\u1ec1u ki\u1ec7n n\u00eau d\u01b0\u1edbi \u0111\u00e2y \u0111\u01b0\u1ee3c th\u1ecfa m\u00e3n v\u1edbi t\u1ea5t c\u1ea3 c\u00e1c t\u00ednh ch\u1ea5t:<\/p>\n

m60\u00ad<\/sub><\/i>\u00a0\u2013 1,93 x\u00a0s60<\/sub><\/i>\u00a0>\u00a0fk<\/sub><\/i>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 (4)<\/p>\n

trong \u0111\u00f3 1,93 l\u00e0 gi\u00e1 tr\u1ecb c\u1ee7a ch\u1ec9 s\u1ed1 ch\u1ea5p nh\u1eadn,\u00a0k,<\/i>\u00a0\u0111\u1ed1i v\u1edbi\u00a0n = 60\u00a0<\/i>v\u00e0 t\u1ef7 l\u1ec7 h\u1ecfng b\u1eb1ng 5% (p\u00a0<\/i>= 0,95) v\u1edbi x\u00e1c su\u1ea5t b\u1eb1ng 90% (1 \u2013\u00a0a\u00a0= 0,90)<\/p>\n

11.3.2.3.2. Ki\u1ec3m tra theo d\u1ea5u hi\u1ec7u lo\u1ea1i tr\u1eeb<\/b><\/p>\n

Khi c\u00e1c t\u00ednh ch\u1ea5t th\u1eed \u0111\u01b0\u1ee3c quy \u0111\u1ecbnh nh\u01b0 gi\u00e1 tr\u1ecb l\u1edbn nh\u1ea5t hay nh\u1ecf nh\u1ea5t th\u00ec t\u1ea5t c\u1ea3 c\u00e1c k\u1ebft qu\u1ea3 \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh tr\u00ean 15 m\u1eabu th\u1eed ph\u1ea3i th\u1ecfa m\u00e3n c\u00e1c y\u00eau c\u1ea7u c\u1ee7a ti\u00eau chu\u1ea9n s\u1ea3n ph\u1ea9m. Trong tr\u01b0\u1eddng h\u1ee3p n\u00e0y l\u00f4 th\u1eed \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 l\u00e0 th\u1ecfa m\u00e3n c\u00e1c y\u00eau c\u1ea7u.<\/p>\n

C\u00e1c ph\u00e9p th\u1eed c\u00f3 th\u1ec3 ti\u1ebfp t\u1ee5c khi nhi\u1ec1u nh\u1ea5t c\u00f3 hai k\u1ebft qu\u1ea3 kh\u00f4ng ph\u00f9 h\u1ee3p \u0111i\u1ec1u ki\u1ec7n. Trong tr\u01b0\u1eddng h\u1ee3p n\u00e0y ph\u1ea3i th\u1eed 45 m\u1eabu th\u1eed ti\u1ebfp theo t\u1eeb c\u00e1c thanh kh\u00e1c nhau trong l\u00f4 th\u1eed nh\u01b0 v\u1eady s\u1ebd c\u00f3 t\u1ed5ng s\u1ed1 60 k\u1ebft qu\u1ea3 th\u1eed. L\u00f4 th\u1eed th\u1ecfa m\u00e3n c\u00e1c y\u00eau c\u1ea7u n\u1ebfu c\u00f3 nhi\u1ec1u nh\u1ea5t 2 trong s\u1ed1 60 k\u1ebft qu\u1ea3 kh\u00f4ng th\u1ecfa m\u00e3n c\u00e1c \u0111i\u1ec1u ki\u1ec7n n\u00e0y.<\/p>\n

11.3.2.3.3. Th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc<\/b><\/p>\n

C\u1ea3 hai m\u1eabu th\u1eed ph\u1ea3i ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c y\u00eau c\u1ea7u c\u1ee7a ti\u00eau chu\u1ea9n n\u00e0y.<\/p>\n

11.3.3. Ki\u1ec3m tra c\u00e1c gi\u00e1 tr\u1ecb nh\u1ecf nh\u1ea5t\/l\u1edbn nh\u1ea5t \u0111\u01b0\u1ee3c quy \u0111\u1ecbnh<\/b><\/p>\n

C\u00e1c ph\u00e9p th\u1eed ph\u1ea3i \u0111\u01b0\u1ee3c ti\u1ebfn h\u00e0nh nh\u01b0 sau:<\/p>\n

a) C\u00e1c thanh c\u1ee7a c\u00f9ng m\u1ed9t m\u1ebb \u0111\u00fac ph\u1ea3i thu\u1ed9c m\u1ed9t nh\u00f3m. C\u1ee9 50 t\u1ea5n hay m\u1ed9t ph\u1ea7n c\u1ee7a n\u00f3 ph\u1ea3i ti\u1ebfn h\u00e0nh m\u1ed9t l\u1ea7n th\u1eed k\u00e9o v\u00e0 m\u1ed9t l\u1ea7n th\u1eed u\u1ed1n\/th\u1eed u\u1ed1n l\u1ea1i cho m\u1ed9t lo\u1ea1i \u0111\u01b0\u1eddng k\u00ednh;<\/p>\n

b) M\u1ed7i k\u1ebft qu\u1ea3 th\u1eed ri\u00eang ph\u1ea3i th\u1ecfa m\u00e3n c\u00e1c gi\u00e1 tr\u1ecb y\u00eau c\u1ea7u theo B\u1ea3ng 6 v\u00e0 c\u00e1c t\u00ednh ch\u1ea5t th\u1eed u\u1ed1n \/ th\u1eed u\u1ed1n l\u1ea1i t\u1ea1i 7.2;<\/p>\n

c) M\u1ed7i m\u1ebb n\u1ea5u ph\u1ea3i ti\u1ebfn h\u00e0nh ph\u00e2n t\u00edch \u0111\u00fac m\u1ed9t l\u1ea7n \u0111\u1ec3 ki\u1ec3m tra th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc (\u0110i\u1ec1u 6). C\u00e1c m\u1eabu ph\u1ea3i \u0111\u01b0\u1ee3c l\u1ea5y theo ISO 14284;<\/p>\n

d) N\u1ebfu b\u1ea5t k\u1ef3 m\u1ed9t k\u1ebft qu\u1ea3 th\u1eed n\u00e0o kh\u00f4ng th\u1ecfa m\u00e3n c\u00e1c y\u00eau c\u1ea7u th\u00ec c\u00f3 th\u1ec3 ti\u1ebfn h\u00e0nh th\u1eed l\u1ea1i theo TCVN 4399;<\/p>\n

e) Nh\u00e0 s\u1ea3n xu\u1ea5t ph\u1ea3i n\u1ed9p m\u1ed9t b\u1ea3n b\u00e1o c\u00e1o k\u1ebft qu\u1ea3 th\u1eed n\u00eau l\u00ean r\u1eb1ng c\u00e1c s\u1ea3n ph\u1ea9m cung c\u1ea5p th\u1ecfa m\u00e3n c\u00e1c t\u00ednh ch\u1ea5t h\u00f3a h\u1ecdc v\u00e0 c\u01a1 h\u1ecdc \u0111\u01b0\u1ee3c quy \u0111\u1ecbnh trong c\u00e1c \u0110i\u1ec1u 6 v\u00e0 \u0110i\u1ec1u 7 v\u00e0 m\u1ed9t b\u1ea3n kh\u1eb3ng \u0111\u1ecbnh r\u1eb1ng c\u00e1c y\u00eau c\u1ea7u kh\u00e1c c\u1ee7a ti\u00eau chu\u1ea9n n\u00e0y c\u0169ng \u0111\u01b0\u1ee3c th\u1ecfa m\u00e3n<\/p>\n

11.3.4. B\u00e1o c\u00e1o th\u1eed nghi\u1ec7m<\/b><\/p>\n

B\u00e1o c\u00e1o th\u1eed nghi\u1ec7m ph\u1ea3i bao g\u1ed3m c\u00e1c th\u00f4ng tin sau:<\/p>\n

a) K\u00fd hi\u1ec7u th\u00e9p l\u00e0m c\u1ed1t b\u00ea t\u00f4ng theo ti\u00eau chu\u1ea9n n\u00e0y;<\/p>\n

b) Chi ti\u1ebft m\u00e1c (tr\u00ean th\u1ebb, s\u01a1n, …);<\/p>\n

c) Th\u1eddi gian th\u1eed;<\/p>\n

d) Kh\u1ed1i l\u01b0\u1ee3ng c\u1ee7a l\u00f4 th\u1eed;<\/p>\n

e) C\u00e1c k\u1ebft qu\u1ea3 th\u1eed.<\/p>\n

 <\/p>\n

TH\u01af M\u1ee4C T\u00c0I LI\u1ec6U THAM KH\u1ea2O<\/b><\/p>\n[1] ISO 3534-1, Statistic \u2013 Vocabulary and symbols \u2013 Part 1: General statistical terms and terms used in probability\u00a0(Th\u1ed1ng k\u00ea \u2013 T\u1eeb v\u1ef1ng v\u00e0 k\u00fd hi\u1ec7u \u2013 Ph\u1ea7n 1: C\u00e1c thu\u1eadt ng\u1eef th\u1ed1ng k\u00ea v\u00e0 c\u00e1c thu\u1eadt ng\u1eef x\u00e1c su\u1ea5t chung)<\/i><\/p>\n[2] ISO 16020, Steel for the reinforcement and prestressing of concrete \u2013 Vocabulary\u00a0(Th\u00e9p d\u00f9ng l\u00e0m c\u1ed1t b\u00ea t\u00f4ng v\u00e0 \u0111\u00fac b\u00ea t\u00f4ng d\u1ef1 \u1ee9ng l\u1ef1c \u2013 T\u1eeb v\u1ef1ng)<\/i><\/p>\n[3] TCVN 6450 (ISO\/IEC Guide 2), Ti\u00eau chu\u1ea9n h\u00f3a v\u00e0 c\u00e1c ho\u1ea1t \u0111\u1ed9ng c\u00f3 li\u00ean quan \u2013 T\u1eeb v\u1ef1ng chung.<\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

N\u1ed9i dung to\u00e0n v\u0103n Ti\u00eau chu\u1ea9n Vi\u1ec7t Nam TCVN 1651-1:2008 v\u1ec1 th\u00e9p c\u1ed1t b\u00ea t\u00f4ng – ph\u1ea7n 1: th\u00e9p thanh tr\u00f2n tr\u01a1n do B\u1ed9 Khoa h\u1ecdc v\u00e0 C\u00f4ng ngh\u1ec7 ban h\u00e0nh TI\u00caU CHU\u1ea8N VI\u1ec6T\u00a0NAM TCVN 1651-1:2008 TH\u00c9P C\u1ed0T B\u00ca T\u00d4NG PH\u1ea6N 1: TH\u00c9P THANH TR\u00d2N TR\u01a0N Steel for the reinforcement of concrete \u2013 Part 1:…<\/p>\n","protected":false},"author":1,"featured_media":7912,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[42],"tags":[],"class_list":["post-7909","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tieu-chuan-xay-dung"],"_links":{"self":[{"href":"https:\/\/tailieuxaydung.net\/index.php?rest_route=\/wp\/v2\/posts\/7909","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tailieuxaydung.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tailieuxaydung.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tailieuxaydung.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/tailieuxaydung.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=7909"}],"version-history":[{"count":5,"href":"https:\/\/tailieuxaydung.net\/index.php?rest_route=\/wp\/v2\/posts\/7909\/revisions"}],"predecessor-version":[{"id":31519,"href":"https:\/\/tailieuxaydung.net\/index.php?rest_route=\/wp\/v2\/posts\/7909\/revisions\/31519"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/tailieuxaydung.net\/index.php?rest_route=\/wp\/v2\/media\/7912"}],"wp:attachment":[{"href":"https:\/\/tailieuxaydung.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=7909"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tailieuxaydung.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=7909"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tailieuxaydung.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=7909"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}