{"id":65734,"date":"2026-06-14T08:00:02","date_gmt":"2026-06-13T23:00:02","guid":{"rendered":"https:\/\/norimen.net\/?p=65734"},"modified":"2026-06-14T16:50:12","modified_gmt":"2026-06-14T07:50:12","slug":"tinh-toan-do-che-phu-cot-thep-cho-khung-doc-2","status":"publish","type":"post","link":"https:\/\/norimen.net\/vi\/rebar-cover-calculation-slope-frame-2\/","title":{"rendered":"M\u1eb9o t\u00ednh to\u00e1n v\u00e0 \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 che ph\u1ee7 c\u1ed1t th\u00e9p | Gi\u00e1m s\u00e1t c\u00f4ng tr\u00ecnh m\u00e1i d\u1ed1c gi\u1ea3i th\u00edch b\u1eb1ng v\u00ed d\u1ee5 th\u1ef1c t\u1ebf v\u1ec1 \u0111\u1ed9 che ph\u1ee7 t\u1ed1i thi\u1ec3u v\u00e0 kho\u1ea3ng tr\u1ed1ng c\u1ed1t th\u00e9p trong c\u00f4ng tr\u00ecnh khung ph\u00e1p l\u00fd"},"content":{"rendered":"<p>Xin ch\u00e0o m\u1ecdi ng\u01b0\u1eddi.<\/p>\n<p>\u0110\u00e2y l\u00e0 Enta.<\/p>\n<p>V\u00e0o th\u1eddi \u0111i\u1ec3m n\u00e0y, tr\u01b0\u1edbc khi m\u00f9a m\u01b0a b\u1eaft \u0111\u1ea7u, c\u00f4ng vi\u1ec7c c\u00f3 v\u1ebb th\u01b0a th\u1edbt h\u01a1n m\u1ed9t ch\u00fat.<\/p>\n<p>V\u00ec th\u01b0\u1eddng ph\u1ea3i \u0111\u1ebfn tr\u1ef1c ti\u1ebfp c\u00f4ng tr\u01b0\u1eddng n\u00ean c\u0169ng c\u00f3 nhi\u1ec1u c\u00e2u h\u1ecfi.<\/p>\n<p>G\u1ea7n \u0111\u00e2y, c\u00f3 m\u1ed9t b\u1ea1n tr\u1ebb h\u1ecfi t\u00f4i: \u201cAnh Enta \u01a1i, cu\u1ed1i c\u00f9ng th\u00ec anh gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1 \u2018\u0111\u1ed9i m\u0169 tr\u00f9ng\u2019 th\u1ebf n\u00e0o v\u1eady?\u201d.<\/p>\n<p>\u0110\u00f3 l\u00e0 m\u1ed9t c\u00e2u h\u1ecfi hay \u0111\u1ea5y (c\u01b0\u1eddi). Tuy nhi\u00ean, th\u1eadt kh\u00f3 \u0111\u1ec3 tr\u1ea3 l\u1eddi ngay l\u1eadp t\u1ee9c ch\u1ec9 b\u1eb1ng m\u1ed9t c\u00e2u. C\u00f3 th\u1ec3 n\u00f3i l\u00e0 \u201c30mm\u201d c\u0169ng \u0111\u01b0\u1ee3c, m\u00e0 n\u00f3i l\u00e0 \u201c40mm\u201d c\u0169ng \u0111\u01b0\u1ee3c.<\/p>\n<p>B\u1edfi v\u00ec \u0111i\u1ec1u \u0111\u00f3 ph\u1ee5 thu\u1ed9c v\u00e0o \u0111i\u1ec1u ki\u1ec7n.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1659\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2016\/11\/b80cbd403a9b33332c2c4f50cd14eee8.jpg\" alt=\"L\u1edbp b\u00ea t\u00f4ng bao ph\u1ee7 c\u1ed1t th\u00e9p\" width=\"600\" height=\"460\" srcset=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2016\/11\/b80cbd403a9b33332c2c4f50cd14eee8.jpg 600w, https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2016\/11\/b80cbd403a9b33332c2c4f50cd14eee8-300x230.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<p>Trong b\u00e0i vi\u1ebft n\u00e0y, t\u00f4i s\u1ebd tr\u00ecnh b\u00e0y v\u1ec1 \u201cl\u1edbp b\u00ea t\u00f4ng che ph\u1ee7 c\u1ed1t th\u00e9p\u201d, t\u1eeb vi\u1ec7c \u00f4n l\u1ea1i \u0111\u1ecbnh ngh\u0129a, c\u00e1ch t\u00ednh to\u00e1n trong k\u1ebft c\u1ea5u khung th\u00e9p, cho \u0111\u1ebfn c\u00e1c m\u1eb9o \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o ti\u00eau chu\u1ea9n t\u1ea1i c\u00f4ng tr\u01b0\u1eddng, k\u00e8m theo c\u00e1c ngu\u1ed3n tham kh\u1ea3o.<\/p>\n<p>\u203bTr\u01b0\u1edbc \u0111\u00e2y c\u0169ng \u0111\u00e3 t\u1eebng...<a href=\"https:\/\/norimen.net\/vi\/cau-truc-khung-che-cot-thep\/\" target=\"_blank\" rel=\"noopener\">V\u1ec1 l\u1edbp b\u00ea t\u00f4ng bao ph\u1ee7 c\u1ed1t th\u00e9p | Quy \u0111\u1ecbnh v\u1ec1 \u0111\u1ed9 d\u00e0y l\u1edbp b\u00ea t\u00f4ng bao ph\u1ee7 khung gi\u00e0n<\/a>T\u00f4i \u0111ang vi\u1ebft m\u1ed9t b\u00e0i b\u00e1o nh\u01b0 v\u1eady, nh\u01b0ng l\u1ea7n n\u00e0y t\u00f4i s\u1ebd \u0111i s\u00e2u h\u01a1n m\u1ed9t ch\u00fat v\u00e0o c\u00e1c ph\u00e9p t\u00ednh v\u00e0 th\u1ef1c ti\u1ec5n t\u1ea1i hi\u1ec7n tr\u01b0\u1eddng nh\u00e9.<\/p>\n<h2>Tr\u01b0\u1edbc h\u1ebft, \u201cl\u1edbp b\u00ea t\u00f4ng che ph\u1ee7\u201d c\u1ee7a c\u1ed1t th\u00e9p l\u00e0 g\u00ec?<\/h2>\n<p>Tr\u01b0\u1edbc ti\u00ean, ch\u00fang ta h\u00e3y l\u00e0m r\u00f5 c\u00e1c thu\u1eadt ng\u1eef.<\/p>\n<p>\u201c\u0110\u1ed9 che ph\u1ee7\u201d (\u0111\u1ed9 d\u00e0y che ph\u1ee7) l\u00e0 kho\u1ea3ng c\u00e1ch ng\u1eafn nh\u1ea5t t\u1eeb b\u1ec1 m\u1eb7t b\u00ea t\u00f4ng \u0111\u1ebfn thanh c\u1ed1t th\u00e9p \u1edf l\u1edbp ngo\u00e0i c\u00f9ng.<\/p>\n<p>Trong l\u0129nh v\u1ef1c ki\u1ebfn tr\u00fac, ng\u01b0\u1eddi ta th\u01b0\u1eddng g\u1ecdi l\u00e0 \u201c\u0111\u1ed9 d\u00e0y l\u1edbp ph\u1ee7\u201d, c\u00f2n trong l\u0129nh v\u1ef1c c\u00f4ng tr\u00ecnh d\u00e2n d\u1ee5ng th\u00ec th\u01b0\u1eddng ch\u1ec9 g\u1ecdi \u0111\u01a1n gi\u1ea3n l\u00e0 \u201cl\u1edbp ph\u1ee7\u201d.<\/p>\n<p>V\u1eady t\u1ea1i sao l\u1ea1i ph\u1ea3i c\u1ed1 t\u00ecnh duy tr\u00ec kho\u1ea3ng c\u00e1ch n\u00e0y? C\u00f3 ba l\u00fd do ch\u00ednh.<\/p>\n<h3>3 vai tr\u00f2 b\u1ea3o v\u1ec7 c\u1ee7a m\u0169 tr\u00f9m \u0111\u1ea7u<\/h3>\n<p>\u0110i\u1ec3m \u0111\u1ea7u ti\u00ean l\u00e0 ch\u1ed1ng g\u1ec9.<\/p>\n<p>V\u00ec b\u00ea t\u00f4ng c\u00f3 t\u00ednh ki\u1ec1m m\u1ea1nh n\u00ean c\u1ed1t th\u00e9p b\u00ean trong s\u1ebd kh\u00f4ng b\u1ecb r\u1ec9 s\u00e9t.<\/p>\n<p>Ng\u01b0\u1ee3c l\u1ea1i, n\u1ebfu l\u1edbp ph\u1ee7 qu\u00e1 m\u1ecfng, n\u01b0\u1edbc v\u00e0 kh\u00f4ng kh\u00ed b\u00ean ngo\u00e0i s\u1ebd d\u1ec5 d\u00e0ng x\u00e2m nh\u1eadp \u0111\u1ebfn c\u1ed1t th\u00e9p, khi\u1ebfn c\u1ed1t th\u00e9p b\u1ecb r\u1ec9 s\u00e9t.<\/p>\n<p>Th\u1ee9 hai l\u00e0 c\u00e1c bi\u1ec7n ph\u00e1p trung h\u00f2a.<\/p>\n<p>B\u00ea t\u00f4ng ph\u1ea3n \u1ee9ng v\u1edbi kh\u00ed carbon dioxide trong kh\u00f4ng kh\u00ed v\u00e0 t\u1eeb t\u1eeb m\u1ea5t t\u00ednh ki\u1ec1m t\u1eeb b\u1ec1 m\u1eb7t (qu\u00e1 tr\u00ecnh trung h\u00f2a).<\/p>\n<p>Khi hi\u1ec7n t\u01b0\u1ee3ng n\u00e0y lan \u0111\u1ebfn c\u1ea3 c\u1ed1t th\u00e9p, l\u1edbp m\u00e0ng ch\u1ed1ng g\u1ec9 s\u1ebd m\u1ea5t t\u00e1c d\u1ee5ng v\u00e0 c\u1ed1t th\u00e9p b\u1eaft \u0111\u1ea7u b\u1ecb g\u1ec9.<\/p>\n<p>L\u1edbp ph\u1ee7 c\u00e0ng d\u00e0y th\u00ec th\u1eddi gian \u0111\u1ec3 qu\u00e1 tr\u00ecnh trung h\u00f2a lan \u0111\u1ebfn c\u1ed1t th\u00e9p c\u00e0ng \u0111\u01b0\u1ee3c k\u00e9o d\u00e0i.<\/p>\n<p>Th\u1ee9 ba l\u00e0 kh\u1ea3 n\u0103ng ch\u1ed1ng ch\u00e1y v\u00e0 b\u00e1m d\u00ednh. N\u00f3 v\u1eeba c\u00f3 vai tr\u00f2 b\u1ea3o v\u1ec7 c\u1ed1t th\u00e9p kh\u1ecfi b\u1ecb ti\u1ebfp x\u00fac \u0111\u1ed9t ng\u1ed9t v\u1edbi nhi\u1ec7t \u0111\u1ed9 cao khi x\u1ea3y ra h\u1ecfa ho\u1ea1n, v\u1eeba c\u00f3 vai tr\u00f2 li\u00ean k\u1ebft ch\u1eb7t ch\u1ebd gi\u1eefa b\u00ea t\u00f4ng v\u00e0 c\u1ed1t th\u00e9p.<\/p>\n<blockquote><p>Tham kh\u1ea3o: \u0110\u1ecbnh ngh\u0129a v\u00e0 vai tr\u00f2 c\u1ee7a l\u1edbp ph\u1ee7 c\u1ed1t th\u00e9p (kho\u1ea3ng c\u00e1ch ng\u1eafn nh\u1ea5t t\u1eeb b\u1ec1 m\u1eb7t b\u00ea t\u00f4ng \u0111\u1ebfn c\u1ed1t th\u00e9p \/ ch\u1ed1ng g\u1ec9, ch\u1ed1ng trung h\u00f2a, ch\u1ed1ng ch\u00e1y)<\/p><\/blockquote>\n<p>N\u00f3i t\u00f3m l\u1ea1i, l\u1edbp b\u1ecdc th\u00e9p gi\u1ed1ng nh\u01b0 m\u1ed9t \u201cb\u1ea3o hi\u1ec3m\u201d \u0111\u1ec3 b\u1ea3o v\u1ec7 tu\u1ed5i th\u1ecd c\u1ee7a c\u1ed1t th\u00e9p v\u1eady.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-65740\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2026\/06\/18a671c9670aa2ecc6aa51f8dfc825ab.jpg\" alt=\"L\u1edbp b\u00ea t\u00f4ng bao ph\u1ee7 c\u1ed1t th\u00e9p\" width=\"600\" height=\"338\" \/><\/p>\n<h2>\u0110\u1ed9 che ph\u1ee7 t\u1ed1i thi\u1ec3u c\u1ee7a k\u1ebft c\u1ea5u khung th\u00e9p \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh nh\u01b0 sau: | Cmin = \u03b1 \u00b7 c0 |<\/h2>\n<p>Ch\u00fang ta s\u1ebd t\u00ecm hi\u1ec3u c\u00e1ch x\u00e1c \u0111\u1ecbnh \u0111\u1ed9 che ph\u1ee7 t\u1ed1i thi\u1ec3u trong k\u1ebft c\u1ea5u khung th\u00e9p.<\/p>\n<p>Trong \u201cH\u01b0\u1edbng d\u1eabn thi\u1ebft k\u1ebf v\u00e0 thi c\u00f4ng c\u00f4ng tr\u00ecnh k\u00e8 (b\u1ea3n s\u1eeda \u0111\u1ed5i) th\u00e1ng 11 n\u0103m Heisei 18\u201d c\u1ee7a Hi\u1ec7p h\u1ed9i B\u1ea3o v\u1ec7 M\u1eb7t d\u1ed1c \u0110\u1eb7c bi\u1ec7t To\u00e0n qu\u1ed1c, vi\u1ec7c t\u00ednh to\u00e1n gi\u00e1 tr\u1ecb t\u1ed1i thi\u1ec3u c\u1ee7a \u0111\u1ed9 che ph\u1ee7 theo c\u00f4ng th\u1ee9c sau \u0111\u00e2y \u0111\u01b0\u1ee3c coi l\u00e0 ti\u00eau chu\u1ea9n.<\/p>\n<blockquote><p>Cmin = \u03b1 \u00b7 c0<br \/>\nCmin: \u0110\u1ed9 che ph\u1ee7 t\u1ed1i thi\u1ec3u<br \/>\n\u03b1: H\u1ec7 s\u1ed1 t\u01b0\u01a1ng \u1ee9ng v\u1edbi c\u01b0\u1eddng \u0111\u1ed9 thi\u1ebft k\u1ebf f\u2019ck c\u1ee7a v\u1eefa<br \/>\n\u30fbf\u2019ck \u2264 18 N\/mm\u00b2 \u2026 \u03b1 = 1,2<br \/>\n\u30fb18 N\/mm\u00b2 &lt; f\u2019ck &lt; 34 N\/mm\u00b2 \u2026 \u03b1 = 1,0<br \/>\n\u30fb34 N\/mm\u00b2 \u2264 f\u2019ck \u2026 \u03b1 = 0,8<br \/>\nc0: \u0110\u1ed9 che ph\u1ee7 c\u01a1 b\u1ea3n. L\u1ea5y 30 mm l\u00e0m c\u01a1 s\u1edf<\/p>\n<p>Hi\u1ec7p h\u1ed9i B\u1ea3o v\u1ec7 M\u1eb7t d\u1ed1c \u0110\u1eb7c bi\u1ec7t To\u00e0n qu\u1ed1c, \u201cH\u01b0\u1edbng d\u1eabn Thi\u1ebft k\u1ebf v\u00e0 Thi c\u00f4ng C\u00f4ng tr\u00ecnh Khung Ch\u1ed1ng Tr\u01b0\u1ee3t (B\u1ea3n s\u1eeda \u0111\u1ed5i), th\u00e1ng 11 n\u0103m Heisei 18\u201d, trang 50<\/p><\/blockquote>\n<p>V\u00ed d\u1ee5, trong tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng khung ph\u00e1p l\u00fd 300 th\u01b0\u1eddng d\u00f9ng l\u00e0 D13 v\u00e0 c\u01b0\u1eddng \u0111\u1ed9 thi\u1ebft k\u1ebf c\u1ee7a v\u1eefa d\u01b0\u1edbi 18 N\/mm\u00b2, th\u00ec,<\/p>\n<p>Cmin = 1,2 \u00d7 30 mm = 36 mm<\/p>\n<p>Nh\u01b0 v\u1eady. N\u00f3i c\u00e1ch kh\u00e1c, \u0111i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 \u201ch\u00e3y \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 che ph\u1ee7 t\u1eeb 36mm tr\u1edf l\u00ean nh\u00e9\u201d.<\/p>\n<p>M\u1ed1i quan h\u1ec7 \u1edf \u0111\u00e2y l\u00e0: khi c\u01b0\u1eddng \u0111\u1ed9 t\u0103ng l\u00ean \u0111\u1ebfn m\u1ee9c \u03b1 = 1,0 ho\u1eb7c 0,8, \u0111\u1ed9 che ph\u1ee7 t\u1ed1i thi\u1ec3u c\u00f3 th\u1ec3 nh\u1ecf h\u01a1n m\u1ed9t ch\u00fat.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4583\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2017\/09\/e30b5d8f2031c3fc1933320b959ebadf.jpg\" alt=\"L\u1edbp b\u00ea t\u00f4ng bao ph\u1ee7 c\u1ed1t th\u00e9p\" width=\"600\" height=\"460\" srcset=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2017\/09\/e30b5d8f2031c3fc1933320b959ebadf.jpg 600w, https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2017\/09\/e30b5d8f2031c3fc1933320b959ebadf-300x230.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<h2>\u201cKho\u1ea3ng tr\u1ed1ng\u201d c\u1ee7a c\u1ed1t th\u00e9p v\u00e0 khung phun b\u00ea t\u00f4ng 40mm<\/h2>\n<p>B\u00ean c\u1ea1nh vi\u1ec7c l\u1eafp n\u1eafp \u0111\u1eady, \u0111i\u1ec1u c\u1ea7n l\u01b0u \u00fd n\u1eefa l\u00e0 \u201ckho\u1ea3ng tr\u1ed1ng\u201d c\u1ee7a c\u1ed1t th\u00e9p.<\/p>\n<p>\u201cAki\u201d l\u00e0 kho\u1ea3ng tr\u1ed1ng gi\u1eefa c\u00e1c thanh c\u1ed1t th\u00e9p li\u1ec1n k\u1ec1. N\u1ebfu kho\u1ea3ng tr\u1ed1ng n\u00e0y qu\u00e1 h\u1eb9p, v\u1eefa (b\u00ea t\u00f4ng) s\u1ebd kh\u00f4ng th\u1ec3 l\u1ea5p \u0111\u1ea7y khe h\u1edf m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3, d\u1eabn \u0111\u1ebfn hi\u1ec7n t\u01b0\u1ee3ng l\u1ea5p \u0111\u1ea7y kh\u00f4ng \u0111\u1ec1u, t\u1ee9c l\u00e0 nguy\u00ean nh\u00e2n g\u00e2y ra hi\u1ec7n t\u01b0\u1ee3ng \u201cjanka\u201d.<\/p>\n<p>C\u0169ng trong \u201cH\u01b0\u1edbng d\u1eabn thi\u1ebft k\u1ebf v\u00e0 thi c\u00f4ng c\u00f4ng tr\u00ecnh khung d\u1ea7m (b\u1ea3n s\u1eeda \u0111\u1ed5i) th\u00e1ng 11 n\u0103m Heisei 18\u201d, ti\u00eau chu\u1ea9n v\u1ec1 kho\u1ea3ng tr\u1ed1ng ngang \u0111\u01b0\u1ee3c quy \u0111\u1ecbnh nh\u01b0 sau:<\/p>\n<blockquote><p>\u30fb\u0110\u01b0\u1eddng k\u00ednh c\u1ed1t th\u00e9p t\u1eeb \u03c6 tr\u1edf l\u00ean<br \/>\n\u30fbT\u1eeb 20mm tr\u1edf l\u00ean<br \/>\n\u30fbL\u1edbn h\u01a1n 4\/3 l\u1ea7n k\u00edch th\u01b0\u1edbc t\u1ed1i \u0111a c\u1ee7a c\u1ed1t li\u1ec7u<br \/>\nTrong s\u1ed1 c\u00e1c gi\u00e1 tr\u1ecb n\u00e0y, gi\u00e1 tr\u1ecb l\u1edbn nh\u1ea5t s\u1ebd \u0111\u01b0\u1ee3c l\u1ea5y l\u00e0m ti\u00eau chu\u1ea9n.<br \/>\nNgo\u00e0i ra, \u0111\u1ed1i v\u1edbi k\u1ebft c\u1ea5u khung thi c\u00f4ng b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p phun b\u00ea t\u00f4ng, \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o kh\u1ea3 n\u0103ng l\u1ea5p \u0111\u1ea7y, kho\u1ea3ng tr\u1ed1ng gi\u1eefa c\u00e1c thanh c\u1ed1t th\u00e9p n\u00ean \u0111\u01b0\u1ee3c duy tr\u00ec \u1edf m\u1ee9c \u00edt nh\u1ea5t 40 mm.<\/p>\n<p>Hi\u1ec7p h\u1ed9i B\u1ea3o v\u1ec7 M\u1eb7t d\u1ed1c \u0110\u1eb7c bi\u1ec7t To\u00e0n qu\u1ed1c \u201cH\u01b0\u1edbng d\u1eabn Thi\u1ebft k\u1ebf v\u00e0 Thi c\u00f4ng C\u00f4ng tr\u00ecnh Khung Ch\u1ed1ng Tr\u01b0\u1ee3t (B\u1ea3n s\u1eeda \u0111\u1ed5i) th\u00e1ng 11 n\u0103m Heisei 18\u201d<\/p><\/blockquote>\n<p>V\u00ec khung thi c\u00f4ng b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p phun \u0111\u01b0\u1ee3c l\u1ea5p \u0111\u1ea7y b\u1eb1ng c\u00e1ch \u201cphun\u201d nh\u01b0 t\u00ean g\u1ecdi, n\u00ean v\u1eefa kh\u00f3 lan t\u1ecfa ra xung quanh h\u01a1n so v\u1edbi vi\u1ec7c \u0111\u1ed5 b\u00ea t\u00f4ng th\u00f4ng th\u01b0\u1eddng.<\/p>\n<p>V\u00ec v\u1eady, ti\u00eau chu\u1ea9n \u201c\u0111\u1ed9 m\u1edf kh\u1ea9u \u0111\u1ed9 n\u00ean t\u1eeb 40mm tr\u1edf l\u00ean\u201d \u0111\u01b0\u1ee3c \u0111\u1eb7t ra kh\u00e1 kh\u1eaft khe h\u01a1n m\u1ed9t ch\u00fat.<\/p>\n<p>Ngay c\u1ea3 t\u1ea1i c\u00e1c c\u00f4ng tr\u01b0\u1eddng li\u00ean quan \u0111\u1ebfn NEXCO, n\u1ebfu b\u1ea1n ghi nh\u1edb con s\u1ed1 \u201c40mm\u201d n\u00e0y th\u00ec vi\u1ec7c trao \u0111\u1ed5i s\u1ebd di\u1ec5n ra nhanh ch\u00f3ng h\u01a1n.<\/p>\n<p>Trong \u201cH\u01b0\u1edbng d\u1eabn thi\u1ebft k\u1ebf v\u00e0 thi c\u00f4ng neo \u0111\u1ea5t\u201d c\u1ee7a NEXCO (C\u00f4ng ty \u0110\u01b0\u1eddng cao t\u1ed1c \u0110\u00f4ng, Trung v\u00e0 T\u00e2y Nh\u1eadt B\u1ea3n) c\u0169ng n\u00eau r\u00f5 quan \u0111i\u1ec3m v\u1ec1 vi\u1ec7c b\u1ed1 tr\u00ed c\u1ed1t th\u00e9p xung quanh khung c\u1ecdc (H\u01b0\u1edbng d\u1eabn n\u00e0y, th\u00e1ng 8 n\u0103m Heisei 19, trang 85\u201386).<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-65842\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2026\/06\/e42a38de3a412822ab5af658810b86d6.jpg\" alt=\"L\u1edbp b\u00ea t\u00f4ng bao ph\u1ee7 c\u1ed1t th\u00e9p\" width=\"600\" height=\"400\" \/><\/p>\n<h2>H\u00e3y th\u1eed t\u00ednh to\u00e1n \u0111\u1ed9 che ph\u1ee7 ngang qua m\u1ed9t v\u00ed d\u1ee5 th\u1ef1c t\u1ebf<\/h2>\n<p>Ch\u1ec9 nh\u00ecn con s\u1ed1 th\u00f4i th\u00ec kh\u00f3 h\u00ecnh dung \u0111\u01b0\u1ee3c, n\u00ean t\u00f4i s\u1ebd th\u1eed theo d\u00f5i hi\u1ec7n t\u01b0\u1ee3ng ch\u1ed3ng ch\u00e9o ngang trong khung quy \u0111\u1ecbnh 300.<\/p>\n<p>Chi\u1ec1u d\u00e0i hi\u1ec7u d\u1ee5ng c\u1ee7a khung \u0111\u01b0\u1ee3c t\u00ednh to\u00e1n, nh\u01b0ng \u1edf \u0111\u00e2y gi\u1ea3 s\u1eed v\u1edbi khung 300 th\u00ec chi\u1ec1u d\u00e0i hi\u1ec7u d\u1ee5ng l\u00e0 235 mm. Nh\u01b0 v\u1eady, ph\u1ea7n c\u00f2n l\u1ea1i l\u00e0,<\/p>\n<p>300 \u2212 235 = 65 mm<\/p>\n<p>N\u1ebfu \u00e1p d\u1ee5ng 65 mm c\u00f2n l\u1ea1i n\u00e0y c\u00f9ng v\u1edbi \u0111\u01b0\u1eddng k\u00ednh c\u1ed1t th\u00e9p (n\u1ebfu l\u00e0 D13 th\u00ec b\u00e1n k\u00ednh l\u00e0 6,5 mm) v\u00e0o b\u1ea3n v\u1ebd b\u1ed1 tr\u00ed v\u00e0 t\u00ednh to\u00e1n l\u1ea1i, ta s\u1ebd c\u00f3 m\u1ed9t v\u00ed d\u1ee5 cho th\u1ea5y chi\u1ec1u cao l\u1edbp b\u00ea t\u00f4ng che ph\u1ee7 ngang \u1edf m\u1ed9t b\u00ean l\u00e0 kho\u1ea3ng 58,5 mm.<\/p>\n<p>Chi ti\u1ebft c\u1ee5 th\u1ec3 s\u1ebd thay \u0111\u1ed5i t\u00f9y theo c\u00e1ch b\u1ed1 tr\u00ed c\u1ed1t th\u00e9p, v\u00ec v\u1eady xin h\u00e3y xem \u0111\u00e2y l\u00e0 c\u00e1c gi\u00e1 tr\u1ecb v\u00ed d\u1ee5 th\u1ef1c t\u1ebf c\u0169ng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong b\u00e0i vi\u1ebft g\u1ed1c.<\/p>\n<p>D\u00f9 c\u00f3 ch\u1ed3ng th\u00eam m\u1ed9t cu\u1ed9n D13 n\u1eefa l\u00ean \u0111\u00f3,<\/p>\n<p>58,5 mm \u2212 13 mm = 45,5 mm<\/p>\n<p>V\u1eabn c\u00f2n 45,5 mm. V\u00ec con s\u1ed1 n\u00e0y \u0111\u00e3 \u0111\u00e1p \u1ee9ng y\u00eau c\u1ea7u \u201ct\u1ed1t nh\u1ea5t l\u00e0 n\u00ean c\u00f3 kho\u1ea3ng tr\u1ed1ng t\u1eeb 40 mm tr\u1edf l\u00ean\u201d, n\u00ean,<\/p>\n<p>40mm &lt; 45,5mm = OK!<\/p>\n<p>V\u1eady l\u00e0 th\u1ebf \u0111\u00f3. N\u00f3 c\u0169ng \u0111\u00e1p \u1ee9ng \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u v\u1ec1 \u0111\u1ed9 ch\u1ed3ng t\u1ed1i thi\u1ec3u 36mm nh\u01b0 \u0111\u00e3 \u0111\u1ec1 c\u1eadp tr\u01b0\u1edbc \u0111\u00f3. Khi t\u1ef1 m\u00ecnh ki\u1ec3m tra k\u1ef9 l\u01b0\u1ee1ng nh\u01b0 th\u1ebf n\u00e0y, b\u1ea1n s\u1ebd c\u00f3 th\u1ec3 c\u1ea3m nh\u1eadn \u0111\u01b0\u1ee3c m\u1ed9t c\u00e1ch tr\u1ef1c quan t\u1ea1i c\u00f4ng tr\u01b0\u1eddng r\u1eb1ng \u201cC\u00e1ch ch\u1ed3ng l\u1edbp n\u00e0y c\u00f3 \u1ed5n kh\u00f4ng?\u201d.<\/p>\n<p>\u203bChi\u1ec1u d\u00e0i hi\u1ec7u d\u1ee5ng 235 mm v\u00e0 \u0111\u1ed9 che ph\u1ee7 ngang 58,5 mm ch\u1ec9 l\u00e0 nh\u1eefng con s\u1ed1 \u0111\u01b0\u1ee3c \u0111\u01b0a ra l\u00e0m v\u00ed d\u1ee5.<\/p>\n<p>Tr\u00ean th\u1ef1c t\u1ebf, vui l\u00f2ng t\u00ednh to\u00e1n d\u1ef1a tr\u00ean c\u00e1c th\u00f4ng s\u1ed1 c\u1ee7a v\u00e1n khu\u00f4n, m\u1eb7t c\u1eaft v\u00e0 b\u1ea3n v\u1ebd thi\u1ebft k\u1ebf \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng. \u0110\u1ed1i v\u1edbi c\u00e1c c\u00f4ng tr\u01b0\u1eddng y\u00eau c\u1ea7u c\u01a1 s\u1edf l\u00fd lu\u1eadn cho c\u00e1c s\u1ed1 li\u1ec7u, xin vui l\u00f2ng ki\u1ec3m tra l\u1ea1i theo h\u01b0\u1edbng d\u1eabn v\u00e0 b\u1ea3n v\u1ebd thi\u1ebft k\u1ebf s\u1eb5n c\u00f3.<\/p>\n<h2>Vi\u1ec7c \u0111\u1ed9i m\u0169 \u201cc\u0169ng kh\u00f4ng n\u00ean \u0111\u1ed9i qu\u00e1 nhi\u1ec1u\u201d<\/h2>\n<p>Cu\u1ed1i c\u00f9ng, xin n\u00f3i th\u00eam m\u1ed9t \u0111i\u1ec1u m\u00e0 m\u1ecdi ng\u01b0\u1eddi th\u01b0\u1eddng d\u1ec5 hi\u1ec3u l\u1ea7m.<\/p>\n<p>Kh\u00f4ng ph\u1ea3i l\u00e0 l\u1edbp ph\u1ee7 c\u00e0ng d\u00e0y th\u00ec c\u00e0ng t\u1ed1t.<\/p>\n<p>B\u00ea t\u00f4ng c\u1ed1t th\u00e9p ch\u1ec9 th\u1ef1c s\u1ef1 ch\u1eafc ch\u1eafn khi c\u1ed1t th\u00e9p v\u00e0 b\u00ea t\u00f4ng h\u00f2a l\u00e0m m\u1ed9t.<\/p>\n<p>C\u00e0ng xa b\u1ec1 m\u1eb7t, ph\u1ea7n b\u00ea t\u00f4ng b\u00ean ngo\u00e0i thanh c\u1ed1t th\u00e9p c\u00e0ng tr\u1edf n\u00ean g\u1ea7n gi\u1ed1ng nh\u01b0 \u201ckh\u00f4ng c\u00f3 c\u1ed1t th\u00e9p\u201d.<\/p>\n<p>V\u00ec b\u00ea t\u00f4ng c\u00f3 \u0111\u1ed9 b\u1ec1n u\u1ed1n th\u1ea5p, n\u00ean n\u1ebfu l\u1edbp b\u00ea t\u00f4ng che ph\u1ee7 qu\u00e1 d\u00e0y, ph\u1ea7n \u0111\u00f3 s\u1ebd d\u1ec5 b\u1ecb n\u1ee9t ho\u1eb7c s\u1ee9t m\u1ebb.<\/p>\n<p>V\u00ec v\u1eady, khi mua tr\u00f9ng l\u1eb7p, \u0111i\u1ec1u quan tr\u1ecdng l\u00e0 ph\u1ea3i gi\u1eef \u0111\u01b0\u1ee3c s\u1ef1 c\u00e2n b\u1eb1ng gi\u1eefa \u201cgi\u1eef l\u1ea1i m\u1ee9c t\u1ed1i thi\u1ec3u, nh\u01b0ng kh\u00f4ng mua qu\u00e1 nhi\u1ec1u\u201d.<\/p>\n<p>Vi\u1ec7c h\u01b0\u1edbng d\u1eabn quy \u0111\u1ecbnh \u0111\u1ed9 che ph\u1ee7 t\u1ed1i thi\u1ec3u ho\u1eb7c \u0111\u1ed9 che ph\u1ee7 c\u01a1 b\u1ea3n l\u00e0 30mm c\u00f3 ngh\u0129a l\u00e0 \u0111\u00e2y l\u00e0 gi\u1edbi h\u1ea1n d\u01b0\u1edbi nh\u1eb1m ng\u0103n ch\u1eb7n t\u00ecnh tr\u1ea1ng qu\u00e1 m\u1ecfng, ch\u1ee9 kh\u00f4ng c\u00f3 ngh\u0129a l\u00e0 c\u00f3 th\u1ec3 l\u00e0m d\u00e0y bao nhi\u00eau t\u00f9y \u00fd, ph\u1ea3i kh\u00f4ng?<\/p>\n<p>\u0110\u00e2y l\u00e0 \u0111i\u1ec3m m\u00e0 c\u00e1c b\u1ea1n tr\u1ebb th\u01b0\u1eddng hi\u1ec3u nh\u1ea7m, n\u00ean t\u00f4i lu\u00f4n c\u1ed1 g\u1eafng gi\u1ea3i th\u00edch \u00edt nh\u1ea5t m\u1ed9t l\u1ea7n t\u1ea1i hi\u1ec7n tr\u01b0\u1eddng.<\/p>\n<p>C\u0169ng c\u00f3 th\u1ec3 x\u1ea3y ra tr\u01b0\u1eddng h\u1ee3p do c\u1ea1o qu\u00e1 nhi\u1ec1u n\u00ean b\u1ec1 m\u1eb7t b\u1ecb bong tr\u00f3c m\u1ed9t m\u1ea3ng.<\/p>\n<p>Cu\u1ed1i c\u00f9ng, \u0111\u1ed1i v\u1edbi \u0111\u1ed9 ch\u1ed3ng ch\u00e9o, t\u1ed1t nh\u1ea5t l\u00e0 n\u00ean l\u1eafp r\u00e1p \u0111\u00fang theo gi\u00e1 tr\u1ecb thi\u1ebft k\u1ebf, n\u1eb1m trong kho\u1ea3ng gi\u1eefa \u201cgi\u1edbi h\u1ea1n d\u01b0\u1edbi \u0111\u1ec3 tr\u00e1nh r\u1ec9 s\u00e9t\u201d v\u00e0 \u201cgi\u1edbi h\u1ea1n tr\u00ean \u0111\u1ec3 duy tr\u00ec t\u00ednh th\u1ed1ng nh\u1ea5t\u201d.<\/p>\n<p>Kh\u00f4ng c\u00f3 th\u1ee7 thu\u1eadt ph\u1ee9c t\u1ea1p n\u00e0o c\u1ea3, ch\u1ec9 c\u1ea7n t\u00ednh to\u00e1n ch\u00ednh x\u00e1c d\u1ef1a tr\u00ean chi\u1ec1u d\u00e0i hi\u1ec7u d\u1ee5ng v\u00e0 \u0111\u01b0\u1eddng k\u00ednh c\u1ed1t th\u00e9p \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o \u0111\u00e1p \u1ee9ng \u0111\u01b0\u1ee3c \u0111\u1ed9 che ph\u1ee7 t\u1ed1i thi\u1ec3u v\u00e0 kho\u1ea3ng tr\u1ed1ng.<\/p>\n<p>Ch\u1ec9 c\u00f3 th\u1ebf th\u00f4i.<\/p>\n<p>T\u00f4i ngh\u0129 \u0111\u00e2y l\u00e0 c\u00e1ch t\u1ed1t nh\u1ea5t \u0111\u1ec3 duy tr\u00ec hi\u1ec7u l\u1ef1c c\u1ee7a khung ph\u00e1p l\u00fd trong th\u1eddi gian d\u00e0i.<\/p>\n<p>Ngo\u00e0i ra, vai tr\u00f2 v\u00e0 nguy\u00ean t\u1eafc c\u01a1 b\u1ea3n c\u1ee7a \u201ckaburi\u201d \u0111\u00e3 \u0111\u01b0\u1ee3c \u0111\u1ec1 c\u1eadp trong b\u00e0i vi\u1ebft tr\u01b0\u1edbc<a href=\"https:\/\/norimen.net\/vi\/cau-truc-khung-che-cot-thep\/\" target=\"_blank\" rel=\"noopener\">V\u1ec1 l\u1edbp b\u00ea t\u00f4ng bao ph\u1ee7 c\u1ed1t th\u00e9p | Quy \u0111\u1ecbnh v\u1ec1 \u0111\u1ed9 d\u00e0y l\u1edbp b\u00ea t\u00f4ng bao ph\u1ee7 khung gi\u00e0n<\/a>B\u00e0i vi\u1ebft n\u00e0y c\u0169ng c\u00f3 \u0111\u1ec1 c\u1eadp \u0111\u1ebfn v\u1ea5n \u0111\u1ec1 \u0111\u00f3, n\u00ean n\u1ebfu b\u1ea1n \u0111\u1ecdc k\u1ebft h\u1ee3p c\u1ea3 hai b\u00e0i, ch\u1eafc ch\u1eafn s\u1ebd hi\u1ec3u r\u00f5 h\u01a1n.<\/p>\n<p>&nbsp;<\/p>\n<p>H\u1eb9n g\u1eb7p l\u1ea1i nh\u00e9.<\/p>\n<blockquote class=\"wp-embedded-content\" data-secret=\"L4x7SAph02\"><p><a href=\"https:\/\/norimen.net\/vi\/do-be-tong-sau-khi-khoan-den-do-dai-quy-dinh\/\">Chi\u1ec1u d\u00e0i khoan sau khi \u0111\u1ed5 b\u00ea t\u00f4ng l\u1ea5p khe h\u1edf | K\u1ebft qu\u1ea3 \u0111o th\u1ef1c t\u1ebf l\u00e0 500 mm, \u0111\u00fang theo thi\u1ebft k\u1ebf<\/a><\/p><\/blockquote>\n<p><iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; visibility: hidden;\" title=\"\u201cChi\u1ec1u d\u00e0i khoan sau khi \u0111\u1ed5 b\u00ea t\u00f4ng l\u1ea5p khe h\u1edf | K\u1ebft qu\u1ea3 \u0111o th\u1ef1c t\u1ebf l\u00e0 500 mm, \u0111\u00fang theo thi\u1ebft k\u1ebf\u201d \u2014 L\u1edbp h\u1ecdc qu\u1ea3n l\u00fd m\u1eb7t d\u1ed1c c\u1ee7a Shin-Enta\" src=\"https:\/\/norimen.net\/fill-concrete-after-drilling-length\/embed\/#?secret=kZZ22SGz30#?secret=L4x7SAph02\" data-secret=\"L4x7SAph02\" width=\"600\" height=\"338\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><\/p>","protected":false},"excerpt":{"rendered":"<p>Xin ch\u00e0o m\u1ecdi ng\u01b0\u1eddi. T\u00f4i l\u00e0 Enta. V\u00e0o th\u1eddi \u0111i\u1ec3m n\u00e0y, tr\u01b0\u1edbc khi m\u00f9a m\u01b0a b\u1eaft \u0111\u1ea7u, c\u00f4ng vi\u1ec7c c\u00f3 v\u1ebb th\u01b0a th\u1edbt h\u01a1n m\u1ed9t ch\u00fat. V\u00ec th\u01b0\u1eddng ph\u1ea3i ra c\u00f4ng tr\u01b0\u1eddng n\u00ean t\u00f4i c\u0169ng nh\u1eadn \u0111\u01b0\u1ee3c nhi\u1ec1u c\u00e2u h\u1ecfi. G\u1ea7n \u0111\u00e2y, m\u1ed9t b\u1ea1n tr\u1ebb \u0111\u00e3 h\u1ecfi t\u00f4i: \u201cAnh Enta \u01a1i, cu\u1ed1i c\u00f9ng th\u00ec anh x\u1eed l\u00fd v\u1ea5n \u0111\u1ec1 \u2018kabu\u2019 nh\u01b0 th\u1ebf n\u00e0o v\u1eady?\u201d. \u0110\u00f3 l\u00e0 m\u1ed9t c\u00e2u h\u1ecfi hay \u0111\u1ea5y (c\u01b0\u1eddi). Tuy nhi\u00ean, t\u00f4i l\u1ea1i kh\u00f4ng th\u1ec3 tr\u1ea3 l\u1eddi ngay l\u1eadp t\u1ee9c\u2026<\/p>","protected":false},"author":2,"featured_media":1659,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[36],"tags":[62,290,14369,14401],"class_list":["post-65734","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-quality","tag-62","tag-290","tag-14369","tag-nexco"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.3 (Yoast SEO v28.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ 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