{"id":1270,"date":"2025-11-05T12:36:05","date_gmt":"2025-11-05T05:36:05","guid":{"rendered":"https:\/\/inoxcuongthinh.com\/thanh-cot-thep-khong-gi-cho-be-tong-ven-bien-chon-thi-cong\/"},"modified":"2025-11-05T12:36:05","modified_gmt":"2025-11-05T05:36:05","slug":"thanh-cot-thep-khong-gi-cho-be-tong-ven-bien-chon-thi-cong","status":"publish","type":"post","link":"https:\/\/inoxcuongthinh.com\/thanh-cot-thep-khong-gi-cho-be-tong-ven-bien-chon-thi-cong\/","title":{"rendered":"Thanh c\u1ed1t th\u00e9p kh\u00f4ng g\u1ec9 cho b\u00ea t\u00f4ng ven bi\u1ec3n: ch\u1ecdn &#038; thi c\u00f4ng"},"content":{"rendered":"<div class=\"custom-toc\">\n<h3>N\u1ed9i dung ch\u00ednh<\/h3>\n<ul>\n<li><a href=\"#toc-0-an-mon-trong-moi-truong-ven-bien-ban-chat-va-he-qu\">\u0102n m\u00f2n trong m\u00f4i tr\u01b0\u1eddng ven bi\u1ec3n: b\u1ea3n ch\u1ea5t v\u00e0 h\u1ec7 qu\u1ea3<\/a><\/li>\n<li><a href=\"#toc-1-vi-sao-chon-thanh-cot-thep-khong-gi\">V\u00ec sao ch\u1ecdn thanh c\u1ed1t th\u00e9p kh\u00f4ng g\u1ec9?<\/a><\/li>\n<li><a href=\"#toc-2-chon-mac-inox-theo-muc-do-xam-thuc-khuyen-nghi\">Ch\u1ecdn m\u00e1c inox theo m\u1ee9c \u0111\u1ed9 x\u00e2m th\u1ef1c (khuy\u1ebfn ngh\u1ecb)<\/a><\/li>\n<li><a href=\"#toc-3-tieu-chuan-co-tinh-va-cac-thong-so-thiet-ke-chinh\">Ti\u00eau chu\u1ea9n, c\u01a1 t\u00ednh v\u00e0 c\u00e1c th\u00f4ng s\u1ed1 thi\u1ebft k\u1ebf ch\u00ednh<\/a><\/li>\n<li><a href=\"#toc-4-chi-tiet-cau-tao-noi-ghep-va-tuong-thich-vat-lieu\">Chi ti\u1ebft c\u1ea5u t\u1ea1o, n\u1ed1i gh\u00e9p v\u00e0 t\u01b0\u01a1ng th\u00edch v\u1eadt li\u1ec7u<\/a><\/li>\n<li><a href=\"#toc-5-thi-cong-bao-quan-va-kiem-soat-chat-luong\">Thi c\u00f4ng, b\u1ea3o qu\u1ea3n v\u00e0 ki\u1ec3m so\u00e1t ch\u1ea5t l\u01b0\u1ee3ng<\/a><\/li>\n<li><a href=\"#toc-6-chien-luoc-dung-inox-toi-uu-chi-phi\">Chi\u1ebfn l\u01b0\u1ee3c d\u00f9ng inox t\u1ed1i \u01b0u chi ph\u00ed<\/a><\/li>\n<li><a href=\"#toc-7-ung-dung-dien-hinh-trong-cong-trinh-ven-bien\">\u1ee8ng d\u1ee5ng \u0111i\u1ec3n h\u00ecnh trong c\u00f4ng tr\u00ecnh ven bi\u1ec3n<\/a><\/li>\n<li><a href=\"#toc-8-thong-so-dat-hang-quan-trong-cho-ky-sunha-thau\">Th\u00f4ng s\u1ed1 \u0111\u1eb7t h\u00e0ng quan tr\u1ecdng cho k\u1ef9 s\u01b0\/nh\u00e0 th\u1ea7u<\/a><\/li>\n<li><a href=\"#toc-9-ket-luan\">K\u1ebft lu\u1eadn<\/a><\/li>\n<\/ul>\n<\/div>\n<p>Trong x\u00e2y d\u1ef1ng d\u00e2n d\u1ee5ng v\u00e0 k\u1ebft c\u1ea5u c\u00f4ng tr\u00ecnh, m\u00f4i tr\u01b0\u1eddng ven bi\u1ec3n l\u00e0 k\u1ebb th\u00f9 s\u1ed1 m\u1ed9t c\u1ee7a b\u00ea t\u00f4ng c\u1ed1t th\u00e9p. Thanh c\u1ed1t th\u00e9p kh\u00f4ng g\u1ec9 (stainless rebar) mang l\u1ea1i s\u1ee9c kh\u00e1ng \u0103n m\u00f2n v\u01b0\u1ee3t tr\u1ed9i tr\u01b0\u1edbc ion chloride, gi\u00fap k\u00e9o d\u00e0i tu\u1ed5i th\u1ecd c\u00f4ng tr\u00ecnh v\u00e0 gi\u1ea3m chi ph\u00ed v\u00f2ng \u0111\u1eddi. B\u00e0i vi\u1ebft n\u00e0y cung c\u1ea5p m\u1ed9t h\u01b0\u1edbng d\u1eabn \u0111\u1ea7y \u0111\u1ee7: c\u01a1 ch\u1ebf \u0103n m\u00f2n, ch\u1ecdn m\u00e1c inox ph\u00f9 h\u1ee3p, ti\u00eau chu\u1ea9n \u00e1p d\u1ee5ng, y\u00eau c\u1ea7u thi\u1ebft k\u1ebf \u2013 thi c\u00f4ng, so s\u00e1nh gi\u1ea3i ph\u00e1p v\u00e0 chi\u1ebfn l\u01b0\u1ee3c t\u1ed1i \u01b0u chi ph\u00ed cho k\u1ebft c\u1ea5u b\u00ea t\u00f4ng ven bi\u1ec3n.<\/p>\n<h2 id=\"toc-0-an-mon-trong-moi-truong-ven-bien-ban-chat-va-he-qu\">\u0102n m\u00f2n trong m\u00f4i tr\u01b0\u1eddng ven bi\u1ec3n: b\u1ea3n ch\u1ea5t v\u00e0 h\u1ec7 qu\u1ea3<\/h2>\n<p>&#8211; Ngu\u1ed3n chloride: h\u01a1i mu\u1ed1i (bi\u1ec3n b\u1eafn), n\u01b0\u1edbc bi\u1ec3n tr\u1ef1c ti\u1ebfp (XS2\/XS3 theo EN 1992-1-1), n\u01b0\u1edbc ng\u1ea7m m\u1eb7n, s\u01b0\u01a1ng mu\u1ed1i. Cl- khu\u1ebfch t\u00e1n qua b\u00ea t\u00f4ng ho\u1eb7c th\u00e2m nh\u1eadp theo mao qu\u1ea3n v\u00e0 v\u1ebft n\u1ee9t.<br \/>\n&#8211; C\u01a1 ch\u1ebf: Khi h\u00e0m l\u01b0\u1ee3ng chloride t\u1ea1i b\u1ec1 m\u1eb7t th\u00e9p v\u01b0\u1ee3t ng\u01b0\u1ee1ng, m\u00e0ng th\u1ee5 \u0111\u1ed9ng tr\u00ean th\u00e9p carbon b\u1ecb ph\u00e1 v\u1ee1 \u2192 \u0103n m\u00f2n \u0111i\u1ec3m (pitting), khe n\u1ee9t, v\u00e0 \u0103n m\u00f2n c\u1ee5c b\u1ed9 d\u1eabn \u0111\u1ebfn n\u1ee9t t\u00e1ch l\u1edbp, bong b\u00ea t\u00f4ng, suy gi\u1ea3m kh\u1ea3 n\u0103ng ch\u1ecbu l\u1ef1c.<br \/>\n&#8211; V\u00f9ng ph\u01a1i nhi\u1ec5m (XS):<br \/>\n  &#8211; XS1: Kh\u00f4ng ti\u1ebfp x\u00fac tr\u1ef1c ti\u1ebfp n\u01b0\u1edbc bi\u1ec3n, nh\u01b0ng c\u00f3 h\u01a1i mu\u1ed1i.<br \/>\n  &#8211; XS2: Ng\u1eadp n\u01b0\u1edbc bi\u1ec3n li\u00ean t\u1ee5c (oxygen th\u1ea5p, nh\u01b0ng Cl- cao).<br \/>\n  &#8211; XS3: V\u00f9ng tri\u1ec1u \u2013 s\u00f3ng v\u1ed7 \u2013 \u1ea9m kh\u00f4 xen k\u1ebd (nguy hi\u1ec3m nh\u1ea5t do oxy d\u1ed3i d\u00e0o + chu k\u1ef3 \u01b0\u1edbt\/kh\u00f4).<\/p>\n<p>H\u1ec7 qu\u1ea3 th\u1ef1c t\u1ebf: nhi\u1ec1u c\u1ea5u ki\u1ec7n ven bi\u1ec3n (m\u1eb7t c\u1ea7u, m\u0169 c\u1ecdc, d\u1ea7m m\u00e9p, b\u1ea3n c\u00e1nh, b\u1ea3n k\u00ea b\u00e3i \u0111\u1ed7) n\u1ee9t, bong b\u00ea t\u00f4ng ch\u1ec9 sau 5\u201315 n\u0103m n\u1ebfu d\u00f9ng th\u00e9p \u0111en\/gi\u1ea3i ph\u00e1p ch\u1ed1ng g\u1ec9 kh\u00f4ng ph\u00f9 h\u1ee3p.<\/p>\n<h2 id=\"toc-1-vi-sao-chon-thanh-cot-thep-khong-gi\">V\u00ec sao ch\u1ecdn thanh c\u1ed1t th\u00e9p kh\u00f4ng g\u1ec9?<\/h2>\n<p>&#8211; M\u00e0ng th\u1ee5 \u0111\u1ed9ng b\u1ec1n v\u1edbi chloride: Inox c\u00f3 ng\u01b0\u1ee1ng chloride kh\u1edfi \u0111\u1ea7u \u0103n m\u00f2n cao g\u1ea5p nhi\u1ec1u l\u1ea7n th\u00e9p carbon (t\u00f9y m\u00e1c v\u00e0 m\u00f4i tr\u01b0\u1eddng).<br \/>\n&#8211; \u0102n m\u00f2n ch\u1eadm v\u00e0 c\u1ee5c b\u1ed9 kh\u00f3 ph\u00e1t tri\u1ec3n: ngay c\u1ea3 khi kh\u1edfi \u0111\u1ea7u, t\u1ed1c \u0111\u1ed9 lan r\u1ed9ng th\u1ea5p h\u01a1n \u0111\u00e1ng k\u1ec3 so v\u1edbi th\u00e9p \u0111en.<br \/>\n&#8211; K\u00e9o d\u00e0i tu\u1ed5i th\u1ecd thi\u1ebft k\u1ebf: m\u1ee5c ti\u00eau 75\u2013100+ n\u0103m v\u1edbi nhu c\u1ea7u b\u1ea3o tr\u00ec t\u1ed1i thi\u1ec3u \u1edf v\u00f9ng bi\u1ec3n l\u00e0 kh\u1ea3 thi khi d\u00f9ng inox \u0111\u00fang m\u00e1c v\u00e0 b\u00ea t\u00f4ng ch\u1ea5t l\u01b0\u1ee3ng th\u1ea5p th\u1ea5m.<br \/>\n&#8211; L\u1ee3i \u00edch v\u00f2ng \u0111\u1eddi: chi ph\u00ed ban \u0111\u1ea7u cao h\u01a1n \u0111\u01b0\u1ee3c b\u00f9 b\u1edfi tr\u00e1nh s\u1eeda ch\u1eefa l\u1edbn, gi\u1ea3m d\u1eebng khai th\u00e1c, gi\u1ea3m r\u1ee7i ro k\u1ebft c\u1ea5u.<\/p>\n<h3>Ch\u1ec9 s\u1ed1 PREN v\u00e0 s\u1ee9c kh\u00e1ng r\u1ed7<\/h3>\n<p>&#8211; PREN (Pitting Resistance Equivalent Number) ~ Cr + 3.3\u00d7Mo + 16\u00d7N.<br \/>\n&#8211; PREN c\u00e0ng cao \u2192 kh\u00e1ng r\u1ed7 chloride c\u00e0ng t\u1ed1t:<br \/>\n  &#8211; 304: PREN ~ 18 (h\u1ea1n ch\u1ebf \u1edf ven bi\u1ec3n).<br \/>\n  &#8211; 316\/316L: PREN ~ 24 (kh\u00e1 t\u1ed1t; ph\u00f9 h\u1ee3p XS1\u2013XS2 nh\u1ea5t \u0111\u1ecbnh).<br \/>\n  &#8211; Duplex 2304: PREN ~ 26\u201328 (t\u1ed1t cho ven bi\u1ec3n n\u00f3i chung).<br \/>\n  &#8211; Duplex 2205: PREN ~ 34\u201336 (r\u1ea5t t\u1ed1t; khuy\u1ebfn ngh\u1ecb cho XS3\/v\u00f9ng s\u00f3ng v\u1ed7).<\/p>\n<h3>So s\u00e1nh nhanh gi\u1ea3i ph\u00e1p<\/h3>\n<p>&#8211; Th\u00e9p \u0111en: r\u1ebb, nh\u01b0ng tu\u1ed5i th\u1ecd th\u1ea5p trong Cl-; ph\u1ee5 thu\u1ed9c n\u1eb7ng v\u00e0o l\u1edbp b\u1ea3o v\u1ec7 v\u00e0 ch\u1ea5t l\u01b0\u1ee3ng b\u00ea t\u00f4ng.<br \/>\n&#8211; Th\u00e9p m\u1ea1 k\u1ebdm: ch\u1ed1ng g\u1ec9 ban \u0111\u1ea7u t\u1ed1t; l\u1edbp k\u1ebdm c\u00f3 th\u1ec3 ti\u00eau hao nhanh \u1edf XS3; kh\u00f4ng ph\u00f9 h\u1ee3p cho tu\u1ed5i th\u1ecd >50 n\u0103m \u1edf v\u00f9ng s\u00f3ng v\u1ed7.<br \/>\n&#8211; Th\u00e9p ph\u1ee7 epoxy: r\u1ebb h\u01a1n inox; \u0111\u1ed9 b\u1ec1n ph\u1ee7 v\u00e0 x\u1eed l\u00fd chi ti\u1ebft (c\u1eaft, u\u1ed1n, v\u1ebft x\u01b0\u1edbc) quy\u1ebft \u0111\u1ecbnh; nhi\u1ec1u c\u00f4ng tr\u00ecnh bi\u1ec3n b\u1ecb suy gi\u1ea3m s\u1edbm do h\u01b0 h\u1ea1i l\u1edbp ph\u1ee7.<br \/>\n&#8211; GFRP\/FRP: mi\u1ec5n \u0103n m\u00f2n nh\u01b0ng m\u00f4 \u0111un th\u1ea5p, n\u1ed1i gh\u00e9p v\u00e0 ki\u1ec3m so\u00e1t bi\u1ebfn d\u1ea1ng ph\u1ee9c t\u1ea1p; kh\u00f4ng d\u1eabn \u0111i\u1ec7n; ph\u00f9 h\u1ee3p c\u1ea5u ki\u1ec7n c\u1ee5 th\u1ec3.<br \/>\n&#8211; Inox (304\/316\/duplex): kh\u00e1ng chloride v\u01b0\u1ee3t tr\u1ed9i, c\u01a1 t\u00ednh t\u01b0\u01a1ng th\u00edch b\u00ea t\u00f4ng; gi\u1ea3i ph\u00e1p c\u00e2n b\u1eb1ng gi\u1eefa \u0111\u1ed9 b\u1ec1n v\u00e0 thi c\u00f4ng.<\/p>\n<h2 id=\"toc-2-chon-mac-inox-theo-muc-do-xam-thuc-khuyen-nghi\">Ch\u1ecdn m\u00e1c inox theo m\u1ee9c \u0111\u1ed9 x\u00e2m th\u1ef1c (khuy\u1ebfn ngh\u1ecb)<\/h2>\n<p>&#8211; XS1 (h\u01a1i mu\u1ed1i, kh\u00f4ng ti\u1ebfp x\u00fac n\u01b0\u1edbc bi\u1ec3n): 316L ho\u1eb7c duplex 2304; t\u0103ng l\u1edbp b\u00ea t\u00f4ng b\u1ea3o v\u1ec7 v\u00e0 b\u00ea t\u00f4ng th\u1ea5p th\u1ea5m.<br \/>\n&#8211; XS2 (ng\u1eadp n\u01b0\u1edbc bi\u1ec3n li\u00ean t\u1ee5c): 316L\/2304 t\u1ed1i thi\u1ec3u; 2205 n\u1ebfu c\u1ea7n bi\u00ean an to\u00e0n cao v\u00e0 tu\u1ed5i th\u1ecd >100 n\u0103m.<br \/>\n&#8211; XS3 (tri\u1ec1u \u2013 s\u00f3ng v\u1ed7 \u2013 \u1ea9m kh\u00f4): duplex 2205 l\u00e0 l\u1ef1a ch\u1ecdn \u01b0u ti\u00ean; 2304 ch\u1ea5p nh\u1eadn \u0111\u01b0\u1ee3c v\u1edbi thi\u1ebft k\u1ebf b\u00ea t\u00f4ng r\u1ea5t th\u1ea5p th\u1ea5m v\u00e0 l\u1edbp b\u1ea3o v\u1ec7 l\u1edbn; 316L ch\u1ec9 d\u00f9ng khi k\u1ebft h\u1ee3p bi\u1ec7n ph\u00e1p b\u1ea3o v\u1ec7 b\u1ed5 sung v\u00e0 ki\u1ec3m so\u00e1t ch\u1ea5t l\u01b0\u1ee3ng nghi\u00eam ng\u1eb7t.<br \/>\n&#8211; V\u1ecb tr\u00ed chi ti\u1ebft nh\u1ea1y c\u1ea3m (m\u00e9p, g\u00f3c, \u0111\u1ea7u neo, m\u1ed1i n\u1ed1i, m\u0169 c\u1ecdc, d\u1ea3i bi\u00ean b\u1ea3n m\u1eb7t c\u1ea7u): \u01b0u ti\u00ean 2205.<br \/>\n&#8211; 304: kh\u00f4ng khuy\u1ebfn ngh\u1ecb cho ph\u1ea7n k\u1ebft c\u1ea5u ngo\u00e0i tr\u1eddi ven bi\u1ec3n; ch\u1ec9 c\u00e2n nh\u1eafc cho khu v\u1ef1c k\u00edn, kh\u00f4, ti\u1ebfp x\u00fac chloride r\u1ea5t th\u1ea5p.<\/p>\n<p>L\u01b0u \u00fd: l\u1ef1a ch\u1ecdn m\u00e1c c\u00f2n ph\u1ee5 thu\u1ed9c v\u00e0o t\u00ednh to\u00e1n tu\u1ed5i th\u1ecd, ch\u1ea5t l\u01b0\u1ee3ng b\u00ea t\u00f4ng, chi\u1ec1u d\u00e0y l\u1edbp b\u1ea3o v\u1ec7, v\u00e0 chi\u1ebfn l\u01b0\u1ee3c b\u1ea3o tr\u00ec.<\/p>\n<h2 id=\"toc-3-tieu-chuan-co-tinh-va-cac-thong-so-thiet-ke-chinh\">Ti\u00eau chu\u1ea9n, c\u01a1 t\u00ednh v\u00e0 c\u00e1c th\u00f4ng s\u1ed1 thi\u1ebft k\u1ebf ch\u00ednh<\/h2>\n<p>&#8211; Ti\u00eau chu\u1ea9n v\u1eadt li\u1ec7u:<br \/>\n  &#8211; ASTM A955\/A955M: Thanh c\u1ed1t th\u00e9p kh\u00f4ng g\u1ec9 cho b\u00ea t\u00f4ng (\u0111\u1ecbnh m\u1ee9c c\u01a1 t\u00ednh, u\u1ed1n, h\u00e0n).<br \/>\n  &#8211; BS 6744: Stainless steel bars for the reinforcement of concrete.<br \/>\n  &#8211; EN 10088: Th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc th\u00e9p kh\u00f4ng g\u1ec9 (tham kh\u1ea3o m\u00e1c).<br \/>\n&#8211; C\u1ea5p b\u1ec1n \u0111i\u1ec3n h\u00ecnh:<br \/>\n  &#8211; ASTM A955: Grade 60 (fy \u2265 420 MPa), Grade 75 (fy \u2265 520 MPa).<br \/>\n  &#8211; BS 6744: 500 MPa (th\u00f4ng d\u1ee5ng).<br \/>\n&#8211; M\u00f4 \u0111un \u0111\u00e0n h\u1ed3i: ~190\u2013200 GPa (t\u01b0\u01a1ng \u0111\u01b0\u01a1ng th\u00e9p carbon).<br \/>\n&#8211; H\u1ec7 s\u1ed1 gi\u00e3n n\u1edf nhi\u1ec7t:<br \/>\n  &#8211; Austenitic (316L): ~16\u201317 \u00b5m\/m.K (cao h\u01a1n th\u00e9p carbon ~12).<br \/>\n  &#8211; Duplex (2304\/2205): ~13 \u00b5m\/m.K (g\u1ea7n th\u00e9p carbon) \u2192 gi\u1ea3m \u1ee9ng su\u1ea5t nhi\u1ec7t ch\u00eanh l\u1ec7ch.<br \/>\n&#8211; B\u00e1m d\u00ednh v\u1edbi b\u00ea t\u00f4ng: t\u01b0\u01a1ng \u0111\u01b0\u01a1ng th\u00e9p carbon n\u1ebfu d\u00f9ng g\u00e2n ti\u00eau chu\u1ea9n; thi\u1ebft k\u1ebf chi\u1ec1u d\u00e0i neo\/lap theo ACI 318 ho\u1eb7c Eurocode 2 nh\u01b0 th\u00e9p th\u01b0\u1eddng (tr\u1eeb khi c\u00f3 d\u1eef li\u1ec7u th\u1eed nghi\u1ec7m cho ph\u00e9p \u0111i\u1ec1u ch\u1ec9nh).<\/p>\n<h3>Thi\u1ebft k\u1ebf b\u00ea t\u00f4ng b\u1ea3o v\u1ec7 cho m\u00f4i tr\u01b0\u1eddng bi\u1ec3n<\/h3>\n<p>&#8211; B\u00ea t\u00f4ng th\u1ea5p th\u1ea5m: w\/b \u2264 0,40; c\u01b0\u1eddng \u0111\u1ed9 \u2265 C35\/45 (ho\u1eb7c t\u01b0\u01a1ng \u0111\u01b0\u01a1ng); s\u1eed d\u1ee5ng ph\u1ee5 gia kho\u00e1ng (x\u1ec9 h\u1ea1t l\u00f2 cao 30\u201350%, tro bay 20\u201330%, silica fume 5\u201310%) \u0111\u1ec3 gi\u1ea3m h\u1ec7 s\u1ed1 khu\u1ebfch t\u00e1n Cl-.<br \/>\n&#8211; L\u1edbp b\u00ea t\u00f4ng b\u1ea3o v\u1ec7:<br \/>\n  &#8211; XS1: \u2265 40\u201350 mm (tham chi\u1ebfu EN 1992; \u0111i\u1ec1u ch\u1ec9nh theo th\u1ef1c t\u1ebf d\u1ef1 \u00e1n).<br \/>\n  &#8211; XS2\/XS3: 50\u201375 mm; t\u0103ng \u1edf v\u00f9ng s\u00f3ng v\u1ed7, m\u00e9p bo, ho\u1eb7c b\u00ea t\u00f4ng phun.<br \/>\n&#8211; H\u1ea1n ch\u1ebf v\u1ebft n\u1ee9t: ki\u1ec3m so\u00e1t b\u1ec1 r\u1ed9ng n\u1ee9t theo ti\u00eau chu\u1ea9n (th\u01b0\u1eddng \u2264 0,2 mm cho m\u00f4i tr\u01b0\u1eddng x\u00e2m th\u1ef1c) v\u00e0 chi ti\u1ebft th\u00e9p ph\u00e2n b\u1ed1 h\u1ee3p l\u00fd.<br \/>\n&#8211; Ph\u1ee5 gia\/xi m\u0103ng: d\u00f9ng ph\u1ee5 gia kh\u00f4ng ch\u1ee9a chloride; c\u00e2n nh\u1eafc inhibitor nitrite khi k\u1ebft h\u1ee3p th\u00e9p carbon.<br \/>\n&#8211; B\u1ea3o d\u01b0\u1ee1ng: \u1ea9m li\u00ean t\u1ee5c t\u1ed1i thi\u1ec3u 7\u201314 ng\u00e0y (c\u00e0ng l\u00e2u c\u00e0ng t\u1ed1t) \u0111\u1ec3 gi\u1ea3m \u0111\u1ed9 r\u1ed7ng b\u1ec1 m\u1eb7t.<\/p>\n<h2 id=\"toc-4-chi-tiet-cau-tao-noi-ghep-va-tuong-thich-vat-lieu\">Chi ti\u1ebft c\u1ea5u t\u1ea1o, n\u1ed1i gh\u00e9p v\u00e0 t\u01b0\u01a1ng th\u00edch v\u1eadt li\u1ec7u<\/h2>\n<p>&#8211; N\u1ed1i ch\u1ed3ng\/lap: theo ACI 318\/Eurocode 2 nh\u01b0 th\u00e9p th\u01b0\u1eddng; c\u00f3 th\u1ec3 gi\u1ea3m khi d\u00f9ng coupler c\u01a1 kh\u00ed \u0111\u1ea1t ch\u1ee9ng ch\u1ec9.<br \/>\n&#8211; Coupler\/c\u1ed1t ch\u1edd: d\u00f9ng coupler kh\u00f4ng g\u1ec9 ho\u1eb7c coupler c\u00e1ch \u0111i\u1ec7n khi n\u1ed1i gi\u1eefa inox v\u00e0 th\u00e9p carbon \u0111\u1ec3 h\u1ea1n ch\u1ebf \u0103n m\u00f2n Galvanic trong m\u00f4i tr\u01b0\u1eddng \u1ea9m m\u1eb7n.<br \/>\n&#8211; K\u1ebft h\u1ee3p inox \u2013 th\u00e9p carbon:<br \/>\n  &#8211; Tr\u00e1nh ti\u1ebfp x\u00fac kim lo\u1ea1i tr\u1ea7n trong v\u00f9ng \u1ea9m; n\u1ebfu bu\u1ed9c ph\u1ea3i k\u1ebft h\u1ee3p, \u0111\u1ea3m b\u1ea3o c\u1ea3 hai \u0111\u01b0\u1ee3c bao b\u1ecdc ho\u00e0n to\u00e0n b\u1edfi b\u00ea t\u00f4ng \u0111\u1eb7c ch\u1eafc, d\u00f9ng \u0111\u1ec7m c\u00e1ch \u0111i\u1ec7n t\u1ea1i g\u1ed1i\/khe.<br \/>\n  &#8211; Chi\u1ebfn l\u01b0\u1ee3c ph\u1ed5 bi\u1ebfn: ch\u1ec9 d\u00f9ng inox cho l\u1edbp th\u00e9p b\u1ec1 m\u1eb7t (top mat, m\u00e9p d\u1ea7m, bi\u00ean b\u1ea3n), th\u00e9p carbon cho ph\u1ea7n c\u00f2n l\u1ea1i.<br \/>\n&#8211; U\u1ed1n v\u00e0 ch\u1ebf t\u1ea1o:<br \/>\n  &#8211; Inox c\u00f3 \u0111\u1ed9 \u0111\u00e0n h\u1ed3i h\u1ed3i (spring-back) l\u1edbn h\u01a1n; c\u1ea7n \u0111\u01b0\u1eddng k\u00ednh tr\u1ee5c u\u1ed1n theo ti\u00eau chu\u1ea9n ASTM A955\/BS 6744 v\u00e0 hi\u1ec7u ch\u1ec9nh m\u00e1y u\u1ed1n.<br \/>\n  &#8211; Tr\u00e1nh x\u01b0\u1edbc s\u00e2u b\u1ec1 m\u1eb7t g\u00e2n; kh\u00f4ng \u0111\u01b0\u1ee3c l\u00e0m n\u00f3ng \u0111\u1ecf \u0111\u1ec3 u\u1ed1n.<br \/>\n&#8211; H\u00e0n:<br \/>\n  &#8211; \u01afu ti\u00ean n\u1ed1i c\u01a1 kh\u00ed; n\u1ebfu h\u00e0n, d\u00f9ng que\/kim lo\u1ea1i h\u00e0n t\u01b0\u01a1ng th\u00edch: 316L d\u00f9ng filler 316L; 2205 d\u00f9ng 2209; ki\u1ec3m so\u00e1t nhi\u1ec7t \u0111\u1ea7u v\u00e0o \u0111\u1ec3 tr\u00e1nh \u1ea3nh h\u01b0\u1edfng v\u00f9ng nhi\u1ec7t (HAZ).<br \/>\n  &#8211; L\u00e0m s\u1ea1ch sau h\u00e0n (pickling\/passivation) n\u1ebfu h\u00e0n ngo\u00e0i hi\u1ec7n tr\u01b0\u1eddng.<\/p>\n<h2 id=\"toc-5-thi-cong-bao-quan-va-kiem-soat-chat-luong\">Thi c\u00f4ng, b\u1ea3o qu\u1ea3n v\u00e0 ki\u1ec3m so\u00e1t ch\u1ea5t l\u01b0\u1ee3ng<\/h2>\n<p>&#8211; L\u01b0u kho v\u00e0 v\u1eadn chuy\u1ec3n:<br \/>\n  &#8211; T\u00e1ch bi\u1ec7t v\u1edbi th\u00e9p carbon; d\u00f9ng \u0111\u1ec7m g\u1ed7\/nh\u1ef1a; ph\u1ee7 b\u1ea1t tho\u00e1ng kh\u00ed.<br \/>\n  &#8211; Tr\u00e1nh b\u1ee5i m\u1ea1t th\u00e9p carbon b\u00e1m v\u00e0o inox (g\u00e2y r\u1ec9 b\u1ec1 m\u1eb7t); kh\u00f4ng k\u00e9o l\u00ea tr\u00ean n\u1ec1n th\u00e9p.<br \/>\n&#8211; Gia c\u00f4ng:<br \/>\n  &#8211; C\u1eaft b\u1eb1ng c\u01b0a b\u0103ng\/l\u01b0\u1ee1i h\u1ee3p kim ho\u1eb7c c\u1eaft m\u00e0i v\u1edbi \u0111\u0129a ri\u00eang cho inox.<br \/>\n  &#8211; D\u00e2y bu\u1ed9c: d\u00f9ng d\u00e2y inox, d\u00e2y composite ho\u1eb7c PVC-coated; k\u00ea con k\u00ea nh\u1ef1a\/b\u00ea t\u00f4ng polymer.<br \/>\n&#8211; \u0110\u1ed5 v\u00e0 \u0111\u1ea7m:<br \/>\n  &#8211; \u0110\u1ea3m b\u1ea3o l\u1edbp b\u1ea3o v\u1ec7 \u0111\u00fang thi\u1ebft k\u1ebf; ki\u1ec3m so\u00e1t n\u1ee9t s\u1edbm do co ng\u00f3t b\u1eb1ng b\u1ea3o d\u01b0\u1ee1ng k\u1ecbp th\u1eddi.<br \/>\n&#8211; Ki\u1ec3m tra \u2013 nghi\u1ec7m thu:<br \/>\n  &#8211; Ch\u1ee9ng ch\u1ec9 v\u1eadt li\u1ec7u (MTC) theo ASTM A955\/BS 6744; ki\u1ec3m tra PMI (nh\u1eadn d\u1ea1ng m\u00e1c) cho l\u00f4 quan tr\u1ecdng.<br \/>\n  &#8211; Th\u1eed u\u1ed1n, k\u00e9o theo ti\u00eau chu\u1ea9n \u0111\u1eb7t h\u00e0ng.<br \/>\n  &#8211; Ki\u1ec3m tra l\u1edbp b\u1ea3o v\u1ec7 b\u1eb1ng cover meter; th\u1eed th\u1ea5m (RCPT ASTM C1202 ho\u1eb7c th\u00ed nghi\u1ec7m khu\u1ebfch t\u00e1n chloride) cho h\u1ed7n h\u1ee3p b\u00ea t\u00f4ng.<br \/>\n  &#8211; Ghi ch\u00e9p truy xu\u1ea5t l\u00f4 v\u00e0 v\u1ecb tr\u00ed l\u1eafp \u0111\u1eb7t, \u0111\u1eb7c bi\u1ec7t khi d\u00f9ng chi\u1ebfn l\u01b0\u1ee3c \u201cinox c\u1ee5c b\u1ed9\u201d.<\/p>\n<h2 id=\"toc-6-chien-luoc-dung-inox-toi-uu-chi-phi\">Chi\u1ebfn l\u01b0\u1ee3c d\u00f9ng inox t\u1ed1i \u01b0u chi ph\u00ed<\/h2>\n<p>&#8211; D\u00f9ng \u201c\u0111\u00fang ch\u1ed7\u201d:<br \/>\n  &#8211; Top mat b\u1ea3n m\u1eb7t c\u1ea7u, d\u1ea7m m\u00e9p, d\u1ea3i bi\u00ean, d\u1ea3i neo c\u00e1p, m\u0169 c\u1ecdc, c\u1ecdc v\u00f9ng tri\u1ec1u\/s\u00f3ng v\u1ed7.<br \/>\n  &#8211; \u0110\u1ea7u c\u1ed1t ch\u1edd l\u1ed9 thi\u00ean, khe co gi\u00e3n, c\u1ed5 \u1ed1ng xuy\u00ean t\u01b0\u1eddng, v\u00f9ng phun s\u01b0\u01a1ng m\u1eb7n.<br \/>\n&#8211; K\u1ebft h\u1ee3p v\u1eadt li\u1ec7u:<br \/>\n  &#8211; Inox (2205\/2304) cho v\u00f9ng b\u1ec1 m\u1eb7t ph\u01a1i nhi\u1ec5m; th\u00e9p carbon cho v\u00f9ng l\u00f5i kh\u00f4; d\u00f9ng coupler c\u00e1ch \u0111i\u1ec7n \u1edf ranh gi\u1edbi.<br \/>\n&#8211; Ph\u00e2n t\u00edch chi ph\u00ed v\u00f2ng \u0111\u1eddi (LCC) \u2013 c\u00e1ch l\u00e0m nhanh:<br \/>\n  1) X\u00e1c \u0111\u1ecbnh tu\u1ed5i th\u1ecd y\u00eau c\u1ea7u (\u2265 75 n\u0103m cho c\u00f4ng tr\u00ecnh ven bi\u1ec3n).<br \/>\n  2) \u01af\u1edbc t\u00ednh chi ph\u00ed \u0111\u1ea7u t\u01b0 ban \u0111\u1ea7u cho ph\u01b0\u01a1ng \u00e1n A (th\u00e9p th\u01b0\u1eddng) v\u00e0 B (inox).<br \/>\n  3) M\u00f4 h\u00ecnh h\u00f3a th\u1eddi \u0111i\u1ec3m v\u00e0 chi ph\u00ed s\u1eeda ch\u1eefa l\u1edbn d\u1ef1 ki\u1ebfn v\u1edbi ph\u01b0\u01a1ng \u00e1n A (v\u00ed d\u1ee5 15\u201325 n\u0103m ph\u1ea3i \u0111\u1ea1i tu), chi\u1ebft kh\u1ea5u v\u1ec1 hi\u1ec7n t\u1ea1i (NPV).<br \/>\n  4) T\u00ednh r\u1ee7i ro gi\u00e1n \u0111o\u1ea1n khai th\u00e1c v\u00e0 chi ph\u00ed gi\u00e1n ti\u1ebfp (an to\u00e0n, giao th\u00f4ng, d\u1eebng s\u1ea3n xu\u1ea5t).<br \/>\n  5) Ch\u1ecdn ph\u01b0\u01a1ng \u00e1n c\u00f3 NPV nh\u1ecf h\u01a1n v\u00e0 ph\u00f9 h\u1ee3p m\u1ee5c ti\u00eau tu\u1ed5i th\u1ecd.<br \/>\n&#8211; V\u00ed d\u1ee5 tham kh\u1ea3o (gi\u00e1 tr\u1ecb minh h\u1ecda):<br \/>\n  &#8211; Kh\u1ed1i l\u01b0\u1ee3ng th\u00e9p cho b\u1ea3n m\u1eb7t c\u1ea7u: 50 t\u1ea5n. Th\u00e9p carbon: 25 tri\u1ec7u VND\/t\u1ea5n; inox duplex: 120 tri\u1ec7u VND\/t\u1ea5n.<br \/>\n  &#8211; Chi ph\u00ed th\u00e9p: A = 1,25 t\u1ef7; B = 6,0 t\u1ef7. T\u1ef7 tr\u1ecdng trong chi ph\u00ed k\u1ebft c\u1ea5u b\u1ea3n ~8\u201312%.<br \/>\n  &#8211; S\u1eeda ch\u1eefa l\u1edbn ph\u01b0\u01a1ng \u00e1n A sau 15\u201320 n\u0103m: 8\u201315 t\u1ef7 (v\u1eadt li\u1ec7u, nh\u00e2n c\u00f4ng, giao th\u00f4ng), l\u1eb7p l\u1ea1i m\u1ed7i ~20 n\u0103m; NPV 50 n\u0103m c\u00f3 th\u1ec3 v\u01b0\u1ee3t ph\u01b0\u01a1ng \u00e1n B ngay t\u1eeb chu k\u1ef3 s\u1eeda ch\u1eefa \u0111\u1ea7u.<br \/>\n  &#8211; K\u1ebft lu\u1eadn \u0111i\u1ec3n h\u00ecnh: Inox \u0111\u1eaft h\u01a1n ban \u0111\u1ea7u nh\u01b0ng r\u1ebb h\u01a1n tr\u00ean v\u00f2ng \u0111\u1eddi, \u0111\u1eb7c bi\u1ec7t \u1edf XS3.<\/p>\n<h2 id=\"toc-7-ung-dung-dien-hinh-trong-cong-trinh-ven-bien\">\u1ee8ng d\u1ee5ng \u0111i\u1ec3n h\u00ecnh trong c\u00f4ng tr\u00ecnh ven bi\u1ec3n<\/h2>\n<p>&#8211; C\u1ea7u v\u01b0\u1ee3t bi\u1ec3n, c\u1ea7u c\u1ea3ng, b\u1ebfn b\u00e3i container: b\u1ea3n m\u1eb7t c\u1ea7u, d\u1ea7m m\u00e9p, m\u1ed1\/tr\u1ee5 v\u00f9ng tri\u1ec1u, m\u0169 c\u1ecdc, \u0111\u1ea7u c\u1ecdc \u01b0\u1edbt\u2013kh\u00f4.<br \/>\n&#8211; K\u00e8 ch\u1eafn s\u00f3ng, b\u1edd k\u00e8, d\u1ea7m m\u0169 k\u00e8, c\u1ea5u ki\u1ec7n prefabricated trong \u0111\u00ea bi\u1ec3n.<br \/>\n&#8211; B\u1ec3 n\u01b0\u1edbc m\u1eb7n, nh\u00e0 m\u00e1y ch\u1ebf bi\u1ebfn h\u1ea3i s\u1ea3n, tr\u1ea1m b\u01a1m n\u01b0\u1edbc bi\u1ec3n, c\u00f4ng tr\u00ecnh c\u1ea5p tho\u00e1t n\u01b0\u1edbc ven bi\u1ec3n.<br \/>\n&#8211; M\u00f3ng tr\u1ee5 \u0111i\u1ec7n gi\u00f3 g\u1ea7n b\u1edd, \u0111\u00e0i m\u00f3ng tr\u1ea1m bi\u1ebfn \u00e1p ven bi\u1ec3n, c\u00f4ng tr\u00ecnh resort s\u00e1t bi\u1ec3n (h\u1ea7m ng\u1ea7m, t\u1ea7ng h\u1ea7m b\u00e3i \u0111\u1ed7).<\/p>\n<h2 id=\"toc-8-thong-so-dat-hang-quan-trong-cho-ky-sunha-thau\">Th\u00f4ng s\u1ed1 \u0111\u1eb7t h\u00e0ng quan tr\u1ecdng cho k\u1ef9 s\u01b0\/nh\u00e0 th\u1ea7u<\/h2>\n<p>&#8211; M\u00e1c v\u1eadt li\u1ec7u: 316L, 2304 (UNS S32304), 2205 (UNS S32205\/S31803) theo ASTM A955\/BS 6744.<br \/>\n&#8211; C\u1ea5p b\u1ec1n: 420\/520 MPa (ASTM) ho\u1eb7c 500 MPa (BS); y\u00eau c\u1ea7u ch\u1ee9ng ch\u1ec9 MTC.<br \/>\n&#8211; \u0110\u01b0\u1eddng k\u00ednh ph\u1ed5 bi\u1ebfn: D10\u2013D32; chi\u1ec1u d\u00e0i thanh 6\/12 m; c\u00f3 th\u1ec3 gia c\u00f4ng theo b\u1ea3n v\u1ebd u\u1ed1n (Bending Schedule).<br \/>\n&#8211; Ph\u1ee5 ki\u1ec7n: d\u00e2y bu\u1ed9c inox, con k\u00ea nh\u1ef1a\/b\u00ea t\u00f4ng polymer, coupler inox\/c\u00e1ch \u0111i\u1ec7n, m\u0169 ch\u1ee5p b\u1ea3o v\u1ec7 \u0111\u1ea7u th\u00e9p ch\u1edd.<br \/>\n&#8211; Y\u00eau c\u1ea7u ch\u1ea5t l\u01b0\u1ee3ng: PMI ng\u1eabu nhi\u00ean, th\u1eed k\u00e9o\/u\u1ed1n \u0111\u1ecbnh k\u1ef3, ki\u1ec3m tra b\u1ec1 m\u1eb7t g\u00e2n, ki\u1ec3m so\u00e1t nhi\u1ec5m b\u1ea9n s\u1eaft.<\/p>\n<h2 id=\"toc-9-ket-luan\">K\u1ebft lu\u1eadn<\/h2>\n<p>Trong m\u00f4i tr\u01b0\u1eddng ven bi\u1ec3n, \u0103n m\u00f2n chloride l\u00e0 t\u00e1c nh\u00e2n h\u1ee7y ho\u1ea1i nhanh nh\u1ea5t c\u1ee7a b\u00ea t\u00f4ng c\u1ed1t th\u00e9p. Thanh c\u1ed1t th\u00e9p kh\u00f4ng g\u1ec9, \u0111\u1eb7c bi\u1ec7t l\u00e0 duplex 2304 v\u00e0 2205, cung c\u1ea5p h\u00e0ng r\u00e0o b\u1ec1n v\u1eefng ch\u1ed1ng \u0103n m\u00f2n, cho ph\u00e9p \u0111\u1ea1t m\u1ee5c ti\u00eau tu\u1ed5i th\u1ecd 75\u2013100+ n\u0103m v\u1edbi chi ph\u00ed v\u00f2ng \u0111\u1eddi t\u1ed1i \u01b0u. Ch\u1ecdn m\u00e1c theo m\u1ee9c x\u00e2m th\u1ef1c (XS1\u2013XS3), thi\u1ebft k\u1ebf b\u00ea t\u00f4ng th\u1ea5p th\u1ea5m v\u1edbi l\u1edbp b\u1ea3o v\u1ec7 \u0111\u1ee7, chi ti\u1ebft n\u1ed1i gh\u00e9p h\u1ee3p l\u00fd v\u00e0 ki\u1ec3m so\u00e1t thi c\u00f4ng ch\u1eb7t ch\u1ebd. \u1ede nh\u1eefng v\u1ecb tr\u00ed nh\u1ea1y c\u1ea3m nh\u01b0 v\u00f9ng tri\u1ec1u\/s\u00f3ng v\u1ed7, \u0111\u1ea7u neo, m\u00e9p bi\u00ean, h\u00e3y \u01b0u ti\u00ean inox ho\u1eb7c chi\u1ebfn l\u01b0\u1ee3c \u201cinox c\u1ee5c b\u1ed9\u201d \u0111\u1ec3 \u0111\u1ea1t hi\u1ec7u qu\u1ea3 chi ph\u00ed. Khi \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf v\u00e0 thi c\u00f4ng \u0111\u00fang chu\u1ea9n, rebar inox l\u00e0 gi\u1ea3i ph\u00e1p tin c\u1eady v\u00e0 kinh t\u1ebf cho c\u00e1c k\u1ebft c\u1ea5u b\u00ea t\u00f4ng ven bi\u1ec3n Vi\u1ec7t Nam.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>V\u00ec sao n\u00ean d\u00f9ng rebar inox cho b\u00ea t\u00f4ng ven bi\u1ec3n, ch\u1ecdn m\u00e1c 316\/2304\/2205 theo l\u1edbp XS, y\u00eau c\u1ea7u thi\u1ebft k\u1ebf, thi c\u00f4ng, v\u00e0 ph\u00e2n t\u00edch chi ph\u00ed v\u00f2ng \u0111\u1eddi. B\u1ec1n 75+ n\u0103m.<\/p>\n","protected":false},"author":7,"featured_media":1019,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[23],"tags":[],"class_list":["post-1270","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tin-tuc"],"acf":[],"_links":{"self":[{"href":"https:\/\/inoxcuongthinh.com\/inct\/wp\/v2\/posts\/1270","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/inoxcuongthinh.com\/inct\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/inoxcuongthinh.com\/inct\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/inoxcuongthinh.com\/inct\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"https:\/\/inoxcuongthinh.com\/inct\/wp\/v2\/comments?post=1270"}],"version-history":[{"count":0,"href":"https:\/\/inoxcuongthinh.com\/inct\/wp\/v2\/posts\/1270\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/inoxcuongthinh.com\/inct\/wp\/v2\/media\/1019"}],"wp:attachment":[{"href":"https:\/\/inoxcuongthinh.com\/inct\/wp\/v2\/media?parent=1270"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/inoxcuongthinh.com\/inct\/wp\/v2\/categories?post=1270"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/inoxcuongthinh.com\/inct\/wp\/v2\/tags?post=1270"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}