{"id":31052,"date":"2023-08-12T07:00:52","date_gmt":"2023-08-12T00:00:52","guid":{"rendered":"https:\/\/chanhkien.org\/?p=31052"},"modified":"2025-05-31T03:12:33","modified_gmt":"2025-05-30T20:12:33","slug":"thao-luan-ve-van-minh-5000-nam-trung-hoa-cau-trieu-chau-phan-1","status":"publish","type":"post","link":"https:\/\/chanhkien.org\/2023\/08\/thao-luan-ve-van-minh-5000-nam-trung-hoa-cau-trieu-chau-phan-1.html","title":{"rendered":"Th\u1ea3o lu\u1eadn v\u1ec1 v\u0103n minh 5000 n\u0103m Trung Hoa: C\u1ea7u Tri\u1ec7u Ch\u00e2u (Ph\u1ea7n 1)"},"content":{"rendered":"<p><b>[ChanhKien.org]<\/b><\/p>\n<ul class=\"gallery mw-gallery-traditional\">\n<li class=\"gallerybox\">\n<div class=\"thumb\"><a href=\"https:\/\/chanhkien.org\/wp-content\/uploads\/2023\/08\/47AD452A-EEAC-45CC-9CDE-B287BA33D9B5.jpeg\"><img decoding=\"async\" class=\"aligncenter size-full wp-image-31053\" src=\"https:\/\/chanhkien.org\/wp-content\/uploads\/2023\/08\/47AD452A-EEAC-45CC-9CDE-B287BA33D9B5.jpeg\" alt=\"\" width=\"450\" height=\"103\" srcset=\"https:\/\/chanhkien.org\/wp-content\/uploads\/2023\/08\/47AD452A-EEAC-45CC-9CDE-B287BA33D9B5.jpeg 450w, https:\/\/chanhkien.org\/wp-content\/uploads\/2023\/08\/47AD452A-EEAC-45CC-9CDE-B287BA33D9B5-300x69.jpeg 300w\" sizes=\"(max-width: 450px) 100vw, 450px\" \/><\/a><\/div>\n<\/li>\n<\/ul>\n<p>Phi l&#432;&#417;ng kh&iacute; th&#7871; ho&agrave;nh,<\/p>\n<p>B&iacute;ch th&#7911;y &#7843;nh &#273;&#7881;nh khung;<\/p>\n<p>&#272;&#259;ng ki&#7873;u &#273;&#7841;p th&#7843;n l&#7897;,<\/p>\n<p>T&#7841;o h&oacute;a nh&#7845;t k&igrave; c&ocirc;ng!<\/p>\n<p><em>Di&#7877;n ngh&#297;a:<\/em><\/p>\n<p>V&ograve;m c&#7847;u bay l&ecirc;n kh&ocirc;ng trung v&#7899;i kh&iacute; th&#7871; l&#7899;n,<\/p>\n<p>L&agrave;n n&#432;&#7899;c trong xanh ph&#7843;n chi&#7871;u m&aacute;i v&ograve;m;<\/p>\n<p>L&ecirc;n c&#7847;u b&#432;&#7899;c tr&ecirc;n con &#273;&#432;&#7901;ng b&#7857;ng ph&#7859;ng,<\/p>\n<p>Th&#7853;t l&agrave; m&#7897;t k&#7923; c&ocirc;ng c&#7911;a t&#7841;o h&oacute;a!<\/p>\n<p><em>T&#7841;m d&#7883;ch:<\/em><\/p>\n<p>Cao v&uacute;t c&#7847;u s&#7915;ng s&#7919;ng<\/p>\n<p>N&#432;&#7899;c bi&#7871;c in &#273;&#7881;nh tr&#7901;i<\/p>\n<p>Tr&ecirc;n c&#7847;u &#273;&#432;&#7901;ng r&#7897;ng r&atilde;i<\/p>\n<p>T&#7841;o h&oacute;a m&#7897;t k&#7923; c&ocirc;ng<\/p>\n<p>C&#7847;u Tri&#7879;u Ch&acirc;u, nguy&ecirc;n tr&#432;&#7899;c &#273;&acirc;y g&#7885;i l&agrave; c&#7847;u An T&#7871;, c&oacute; l&#7883;ch s&#7917; l&acirc;u &#273;&#7901;i, n&#7893;i ti&#7871;ng kh&#7855;p g&#7847;n xa. C&#7847;u t&#7885;a l&#7841;c tr&ecirc;n s&ocirc;ng H&agrave;o (&acirc;m &#273;&#7885;c &#28102; xi&aacute;o) c&aacute;ch th&#7883; tr&#7845;n Th&agrave;nh Nam, huy&#7879;n Tri&#7879;u, t&#7881;nh H&agrave; B&#7855;c kho&#7843;ng 2,5 km, l&agrave; m&#7897;t c&acirc;y c&#7847;u v&ograve;m x&acirc;y b&#7857;ng &#273;&aacute;, ng&#432;&#7901;i d&acirc;n &#273;&#7883;a ph&#432;&#417;ng g&#7885;i l&agrave; &#272;&#7841;i Th&#7841;ch Ki&#7873;u, do ngh&#7879; nh&acirc;n L&yacute; Xu&acirc;n c&#7911;a tri&#7873;u &#273;&#7841;i nh&agrave; T&ugrave;y thi&#7871;t k&#7871; v&agrave; x&acirc;y d&#7921;ng, &#273;&#432;&#7907;c ho&agrave;n th&agrave;nh v&agrave;o kho&#7843;ng n&#259;m Ki&#7871;n Nghi&#7879;p th&#7913; s&aacute;u (n&#259;m 605), &#273;&#7871;n ng&agrave;y nay, c&acirc;y c&#7847;u n&agrave;y &#273;&atilde; c&oacute; h&#417;n 1400 n&#259;m l&#7883;ch s&#7917;, l&agrave; c&acirc;y c&#7847;u v&ograve;m &#273;&aacute; l&acirc;u &#273;&#7901;i nh&#7845;t tr&ecirc;n th&#7871; gi&#7899;i v&#7851;n c&ograve;n t&#7891;n t&#7841;i cho &#273;&#7871;n ng&agrave;y nay.<\/p>\n<ul class=\"gallery mw-gallery-traditional\">\n<li class=\"gallerybox\">\n<div class=\"thumb\"><a href=\"https:\/\/chanhkien.org\/wp-content\/uploads\/2023\/08\/D36A3056-C359-4BAE-BE26-F559CBFAD93F.jpeg\"><img decoding=\"async\" class=\"aligncenter size-full wp-image-31054\" src=\"https:\/\/chanhkien.org\/wp-content\/uploads\/2023\/08\/D36A3056-C359-4BAE-BE26-F559CBFAD93F.jpeg\" alt=\"\" width=\"450\" height=\"275\" srcset=\"https:\/\/chanhkien.org\/wp-content\/uploads\/2023\/08\/D36A3056-C359-4BAE-BE26-F559CBFAD93F.jpeg 450w, https:\/\/chanhkien.org\/wp-content\/uploads\/2023\/08\/D36A3056-C359-4BAE-BE26-F559CBFAD93F-300x183.jpeg 300w\" sizes=\"(max-width: 450px) 100vw, 450px\" \/><\/a><\/div>\n<\/li>\n<\/ul>\n<p>V&#7873; ngh&#7879; nh&acirc;n L&yacute; Xu&acirc;n, ch&#7881; bi&#7871;t r&#7857;ng &ocirc;ng l&agrave; ng&#432;&#7901;i huy&#7879;n L&acirc;m Th&agrave;nh, th&#7883; tr&#7845;n H&igrave;nh &#272;&agrave;i, t&#7881;nh H&agrave; B&#7855;c, ngo&agrave;i ra kh&ocirc;ng th&#7845;y c&oacute; ghi ch&eacute;p n&agrave;o v&#7873; cu&#7897;c &#273;&#7901;i c&#7911;a &ocirc;ng trong s&#7917; s&aacute;ch.<\/p>\n<p>T&#7841;i sao c&#7847;u Tri&#7879;u Ch&acirc;u l&#7841;i n&#7893;i ti&#7871;ng nh&#432; v&#7853;y? Ch&#7895; huy&#7873;n di&#7879;u b&iacute; &#7849;n c&#7911;a n&oacute; &#7903; &#273;&acirc;u? Ch&uacute;ng ta s&#7869; c&ugrave;ng nhau t&igrave;m hi&#7875;u v&#7873; n&oacute;.<\/p>\n<p>C&#7847;u Tri&#7879;u Ch&acirc;u l&agrave; c&acirc;y c&#7847;u v&ograve;m &#273;&aacute; nh&#7883;p &#273;&#417;n c&oacute; kh&#7849;u &#273;&#7897; l&#7899;n, m&#7863;t c&#7847;u g&#7847;n nh&#432; c&oacute; m&#7913;c ngang b&#7857;ng v&#7899;i m&#7863;t &#273;&#432;&#7901;ng, kh&aacute; r&#7897;ng (&#273;&#7841;t 9 m&eacute;t), &#273;&#432;&#7907;c x&acirc;y b&#7857;ng m&#7897;t lo&#7841;i &#273;&aacute; sa th&#7841;ch xanh x&aacute;m t&#7841;i &#273;&#7883;a ph&#432;&#417;ng. M&#7863;t c&#7847;u d&agrave;i h&#417;n 50 m&eacute;t, &#273;&#7897; d&agrave;i c&#7911;a v&ograve;m c&#7847;u h&#417;n 37 m&eacute;t, qua &#273;&acirc;y ta c&oacute; th&#7875; th&#7845;y H&agrave;o Th&#7911;y l&agrave; m&#7897;t d&ograve;ng s&ocirc;ng kh&aacute; r&#7897;ng. C&#7847;u Tri&#7879;u Ch&acirc;u th&#7853;t s&#7921; r&#7845;t &#273;&#7865;p, c&#361;ng r&#7845;t kh&iacute; th&#7871;, c&acirc;y c&#7847;u nh&#432; m&#7897;t d&#7843;i c&#7847;u v&#7891;ng v&#7855;t qua hai b&#7901; s&ocirc;ng H&agrave;o Th&#7911;y.<\/p>\n<p>Tuy nhi&ecirc;n, d&ugrave; sao th&igrave; &#273;&acirc;y c&#361;ng ch&#7881; l&agrave; c&#7843;m quan, &#273;i&#7873;u tuy&#7879;t di&#7879;u h&#417;n c&oacute; l&#7869; ch&iacute;nh &#7903; &yacute; t&#432;&#7903;ng t&agrave;i t&igrave;nh, thi&#7871;t k&#7871; th&#7847;n k&#7923; v&agrave; k&#7929; thu&#7853;t x&acirc;y d&#7921;ng &#273;&#7897;c &#273;&aacute;o c&#7911;a c&acirc;y c&#7847;u n&agrave;y.<\/p>\n<p><span id=\"1._Thi&#7871;t_k&#7871;_v&ograve;m_cu&#7889;n_m&#7897;t_nh&#7883;p_kh&#7849;u_&#273;&#7897;_l&#7899;n_(v&ograve;m_v&ograve;ng_cung)\"><\/span><strong><span id=\"1._Thi.E1.BA.BFt_k.E1.BA.BF_v.C3.B2m_cu.E1.BB.91n_m.E1.BB.99t_nh.E1.BB.8Bp_kh.E1.BA.A9u_.C4.91.E1.BB.99_l.E1.BB.9Bn_.28v.C3.B2m_v.C3.B2ng_cung.29\" class=\"mw-headline\">1. Thi&#7871;t k&#7871; v&ograve;m cu&#7889;n m&#7897;t nh&#7883;p kh&#7849;u &#273;&#7897; l&#7899;n (v&ograve;m v&ograve;ng cung)<\/span><\/strong><\/p>\n<p>Gi&#7843; s&#7917; thi&#7871;t k&#7871; m&#7897;t c&acirc;y c&#7847;u nh&#7883;p &#273;&#417;n &ldquo;v&ograve;m b&aacute;n nguy&#7879;t&rdquo;, v&#7899;i kh&#7849;u &#273;&#7897; nh&#7883;p l&#7899;n nh&#432; v&#7853;y &#7855;t ph&#7843;i l&agrave;m m&#7863;t c&#7847;u cao nh&#432; ng&#7885;n n&uacute;i nh&#7887;, th&ecirc;m v&agrave;o &#273;&oacute; khi &#273;&#7897; d&agrave;i v&ograve;m cung l&#7899;n h&#417;n s&#7869; l&agrave;m t&#7889;n nhi&#7873;u l&#432;&#7907;ng &#273;&aacute; x&acirc;y c&#7847;u h&#417;n, tr&#7885;ng l&#432;&#7907;ng c&acirc;u khi n&agrave;y c&#361;ng t&#259;ng l&ecirc;n, nh&#7919;ng kh&#7889;i &#273;&aacute; b&ecirc;n d&#432;&#7899;i s&#7869; ph&#7843;i ch&#7883;u &aacute;p l&#7921;c l&#7899;n h&#417;n, cu&#7889;i c&ugrave;ng t&#259;ng &#273;&#7897; nguy hi&#7875;m; t&iacute;nh nguy hi&#7875;m trong thi c&ocirc;ng l&#7899;n, h&#417;n n&#7919;a v&igrave; v&ograve;m x&acirc;y cao n&ecirc;n t&iacute;nh &#7893;n &#273;&#7883;nh c&#7911;a c&#7847;u tr&#7903; n&ecirc;n c&#7921;c k&eacute;m. Ng&#432;&#7901;i &#273;i qua c&#7847;u s&#7869; g&#7863;p kh&oacute; kh&#259;n h&#7879;t nh&#432; leo n&uacute;i v&#7853;y, v&igrave; v&#7853;y &#273;&#7875; kh&#7855;c ph&#7909;c vi&#7879;c x&acirc;y c&#7847;u cao ng&#432;&#7901;i ta ch&#7881; c&oacute; th&#7875; thi&#7871;t k&#7871; th&ecirc;m nhi&#7873;u nh&#7919;ng nh&#7883;p v&ograve;m h&igrave;nh b&aacute;n nguy&#7879;t nh&#7887;. Tuy nhi&ecirc;n n&#7871;u thi&#7871;t k&#7871; th&ecirc;m nhi&#7873;u nh&#7883;p b&aacute;n nguy&#7879;t c&#361;ng s&#7869; l&agrave;m hao ph&iacute; l&#432;&#7907;ng l&#7899;n v&#7853;t li&#7879;u &#273;&aacute;, &#273;&#7897; kh&oacute; trong thi c&ocirc;ng c&#361;ng l&#7899;n, m&agrave; l&#7841;i c&ograve;n l&agrave;m gi&#7843;m &#273;&aacute;ng k&#7875; l&#432;u l&#432;&#7907;ng d&ograve;ng ch&#7843;y (do ph&#7843;i &#273;&#7863;t tr&#7909; &#273;&aacute; &#7903; l&ograve;ng s&ocirc;ng), thuy&#7873;n l&#7899;n kh&ocirc;ng c&aacute;ch n&agrave;o &#273;i qua; vi&#7879;c &#273;&#7863;t tr&#7909; &#273;&aacute; c&ograve;n t&#259;ng l&#7921;c c&#7843;n d&ograve;ng n&#432;&#7899;c, s&#7913;c n&#432;&#7899;c t&aacute;c &#273;&#7897;ng v&agrave;o tr&#7909; c&#7847;u theo h&#432;&#7899;ng ngang t&#7915; &#273;&oacute; t&#259;ng l&ecirc;n, l&agrave;m t&#259;ng nguy c&#417; b&#7883; n&#432;&#7899;c l&#361; ph&aacute; h&#7911;y (&#272;i&#7873;u n&agrave;y l&agrave;m t&ocirc;i nh&#7899; &#273;&#7871;n ch&iacute;nh s&aacute;ch tr&#7883; th&#7911;y v&#7899;i t&#432; duy b&#7841;i n&atilde;o c&#7911;a <a class=\"lar-automated-link\" href=\"https:\/\/chanhkien.org\/chu-giai-tu-vung#trung_cong\" 28745 rel=\"nofollow\" target=\"_blank\">Trung C&#7897;ng<\/a> l&agrave; &ldquo;Nghi&ecirc;m ph&ograve;ng t&#7917; th&#7911;&rdquo; (canh ph&ograve;ng nghi&ecirc;m ng&#7863;t v&agrave; t&#7917; th&#7911;), &ldquo;D&#297; th&#7911;y vi &#273;&#7883;ch&rdquo; (coi n&#432;&#7899;c l&#361; nh&#432; k&#7867; th&ugrave;), &ldquo;tri&#7879;t giang &#273;o&#7841;n l&#432;u&rdquo; (ng&#259;n s&ocirc;ng c&#7855;t &#273;&#7913;t d&ograve;ng ch&#7843;y)).<\/p>\n<p>&ldquo;V&ograve;m cu&#7889;n m&#7897;t nh&#7883;p kh&#7849;u &#273;&#7897; l&#7899;n&rdquo; m&agrave; L&yacute; Xu&acirc;n thi&#7871;t k&#7871; c&oacute; c&aacute;c &#432;u &#273;i&#7875;m nh&#432;: gi&uacute;p gi&#7843;m &#273;&aacute;ng k&#7875; chi&#7873;u cao v&ograve;m so v&#7899;i v&ograve;m b&aacute;n nguy&#7879;t, khi&#7871;n cho m&#7863;t c&#7847;u g&#7847;n nh&#432; ngang b&#7857;ng v&#7899;i m&#7863;t &#273;&#432;&#7901;ng &#7903; hai b&ecirc;n b&#7901; s&ocirc;ng, &#273;&#7897; d&agrave;i v&ograve;m cu&#7889;n nh&#7901; v&#7853;y &#273;&#432;&#7907;c r&uacute;t ng&#7855;n, l&#432;&#7907;ng &#273;&aacute; gi&#7843;m, tr&#7885;ng l&#432;&#7907;ng tr&#7903; n&ecirc;n nh&#7865; h&#417;n, &aacute;p l&#7921;c l&ecirc;n c&aacute;c kh&#7889;i &#273;&aacute; c&#361;ng gi&#7843;m, t&iacute;nh &#7893;n &#273;&#7883;nh cao. V&#7899;i m&#7897;t nh&#7883;p c&#7847;u &#273;&#417;n kh&#7849;u &#273;&#7897; l&#7899;n nh&#432; v&#7853;y, m&#7863;t d&#432;&#7899;i v&ograve;m c&#7847;u ho&agrave;n to&agrave;n th&ocirc;ng tho&aacute;ng, khi&#7871;n cho d&ograve;ng n&#432;&#7899;c l&#432;u th&ocirc;ng kh&ocirc;ng b&#7883; c&#7843;n tr&#7903;, thuy&#7873;n l&#7899;n c&#361;ng c&oacute; th&#7875; &#273;i qua.<\/p>\n<ul class=\"gallery mw-gallery-traditional\">\n<li class=\"gallerybox\">\n<div class=\"thumb\"><a href=\"https:\/\/chanhkien.org\/wp-content\/uploads\/2023\/08\/6B588D7E-1390-4FA1-8F75-D63430488CDD.jpeg\"><img decoding=\"async\" class=\"aligncenter size-full wp-image-31055\" src=\"https:\/\/chanhkien.org\/wp-content\/uploads\/2023\/08\/6B588D7E-1390-4FA1-8F75-D63430488CDD.jpeg\" alt=\"\" width=\"450\" height=\"338\" srcset=\"https:\/\/chanhkien.org\/wp-content\/uploads\/2023\/08\/6B588D7E-1390-4FA1-8F75-D63430488CDD.jpeg 450w, https:\/\/chanhkien.org\/wp-content\/uploads\/2023\/08\/6B588D7E-1390-4FA1-8F75-D63430488CDD-300x225.jpeg 300w\" sizes=\"(max-width: 450px) 100vw, 450px\" \/><\/a><\/div>\n<\/li>\n<\/ul>\n<p>N&oacute;i &#273;&#7871;n l&#7907;i &iacute;ch c&#7911;a vi&#7879;c &ldquo;gi&#7843;m &#273;&#7897; cao cho v&ograve;m&rdquo;, t&ocirc;i mu&#7889;n d&#7851;n &#273;&#7871;n m&#7897;t tham s&#7889; &ldquo;t&#7881; l&#7879; ph&#7859;ng E&rdquo; (th&#7921;c t&#7871; th&igrave; c&#7893; nh&acirc;n kh&ocirc;ng c&oacute; c&aacute;ch n&oacute;i nh&#432; th&#7871; n&agrave;y, m&agrave; l&agrave; m&#7897;t ki&#7875;u t&#432; duy c&ograve;n k&#7923; di&#7879;u h&#417;n). T&#7881; l&#7879; ph&#7859;ng E &#273;&#432;&#7907;c t&iacute;nh b&#7857;ng c&aacute;ch l&#7845;y chi&#7873;u cao H c&#7911;a v&ograve;m chia cho m&#7897;t n&#7917;a chi&#7873;u d&agrave;i c&#7911;a nh&#7883;p c&#7847;u 0,5L. Gi&aacute; tr&#7883; thu &#273;&#432;&#7907;c t&#7915; ph&eacute;p t&iacute;nh n&agrave;y s&#7869; n&#7857;m trong kho&#7843;ng t&#7915; 0 &ndash; 1, th&ocirc;ng th&#432;&#7901;ng gi&aacute; tr&#7883; n&agrave;y c&agrave;ng nh&#7887; th&igrave; c&#7845;u tr&uacute;c c&#7847;u v&ograve;m c&agrave;ng t&#7889;t, nh&#432; v&#7853;y chi&#7873;u cao v&ograve;m c&#7847;u s&#7869; th&#7845;p, chi&#7873;u d&agrave;i c&#7847;u c&#361;ng s&#7869; ng&#7855;n, ti&#7871;t ki&#7879;m v&#7853;t li&#7879;u, tr&#7885;ng l&#432;&#7907;ng nh&#7865;, &aacute;p l&#7921;c nh&#7887;, nh&#432;ng gi&aacute; tr&#7883; n&agrave;y n&#7871;u b&#7857;ng 0 th&igrave; l&#7841;i kh&ocirc;ng &#273;&#432;&#7907;c, s&#7869; kh&ocirc;ng ph&#7843;i l&agrave; v&ograve;m n&#7919;a. Tuy nhi&ecirc;n n&#7871;u gi&aacute; tr&#7883; n&agrave;y th&#7845;p qu&aacute; th&igrave; e r&#7857;ng c&#361;ng kh&ocirc;ng t&#7889;t, nh&#7919;ng kh&#7889;i &#273;&aacute; c&oacute; th&#7875; d&#7877; b&#7883; r&#7899;t xu&#7889;ng, n&ecirc;n c&#7847;n ph&#7843;i t&iacute;nh to&aacute;n sao cho gi&aacute; tr&#7883; n&agrave;y &#7903; &#273;i&#7875;m t&#7889;i &#432;u. C&aacute; nh&acirc;n t&ocirc;i cho r&#7857;ng, v&#7873; m&#7863;t ti&#7871;p x&uacute;c c&#7911;a c&aacute;c kh&#7889;i &#273;&aacute; l&agrave;m c&#7845;u tr&uacute;c m&aacute;i v&ograve;m ph&#7843;i th&#7853;t ch&#7863;t, l&#7921;c &eacute;p tr&ecirc;n d&#432;&#7899;i n&ecirc;n &#273;&#432;&#7907;c chia &#273;&#7873;u, &#273;&#7875; tr&aacute;nh tr&#432;&#7901;ng h&#7907;p &#273;&aacute;ng ti&#7871;c x&#7843;y ra. &#272;&#7897; cao c&#7911;a m&aacute;i v&ograve;m c&#7847;u An T&#7871; l&agrave; H = 7,23m, chi&#7873;u d&agrave;i nh&#7883;p c&#7847;u ch&iacute;nh l&agrave; L=37,47m (c&oacute; n&#417;i n&oacute;i l&agrave; 37,04m), t&#7881; l&#7879; ph&#7859;ng E = 0,38. T&ocirc;i ph&aacute;t hi&#7879;n, &#273;i&#7875;m gi&aacute; tr&#7883; 0,38 n&agrave;y, l&#7841;i h&#7847;u nh&#432; ch&iacute;nh l&agrave; ph&#7847;n b&ugrave; c&#7911;a 0,618 trong kho&#7843;ng t&#7915; 0 &#273;&#7871;n 1, t&#7913;c l&agrave; kho&#7843;ng c&aacute;ch gi&#7919;a &#273;&#7881;nh v&ograve;m b&aacute;n nguy&#7879;t &#273;&#7871;n &ldquo;v&ograve;m v&ograve;ng cung&rdquo; l&agrave; 0,618! &#272;&acirc;y ch&iacute;nh l&agrave; &ldquo;&#273;i&#7875;m v&agrave;ng&rdquo;! L&agrave;m sao l&#7841;i v&#7915;a kh&eacute;o nh&#432; v&#7853;y?<\/p>\n<p>Theo t&agrave;i li&#7879;u th&#7889;ng k&ecirc; c&#7911;a B&aacute;ch khoa th&#432; (Wikipedia), th&igrave; t&#7881; l&#7879; ph&#7859;ng c&#7911;a c&#7847;u An T&#7871; l&agrave; x&#7871;p s&#7889; m&#7897;t trong ng&agrave;nh c&#7847;u to&agrave;n th&#7871; gi&#7899;i. R&#7889;t cu&#7897;c th&igrave; ngh&#7879; nh&acirc;n L&yacute; Xu&acirc;n l&agrave;m sao c&oacute; th&#7875; ngh&#297; ra &#273;&#432;&#7907;c thi&#7871;t k&#7871; c&#7911;a c&acirc;y c&#7847;u v&ograve;m cao n&agrave;y, &#273;&#7871;n nay v&#7851;n kh&ocirc;ng c&oacute; c&aacute;ch n&agrave;o bi&#7871;t &#273;&#432;&#7907;c.<\/p>\n<p>Th&#7853;t ra kh&aacute;i ni&#7879;m v&#7873; t&#7881; l&#7879; ph&#7859;ng &#273;&#432;&#7907;c &#273;&#7883;nh ngh&#297;a nh&#432; tr&ecirc;n l&agrave; ch&#432;a th&#7887;a &#273;&aacute;ng. Theo &yacute; ngh&#297;a c&#7911;a v&#7853;t l&yacute; h&#7885;c m&agrave; gi&#7843;ng th&igrave; l&#7869; ra tr&#7883; s&#7889; c&agrave;ng l&#7899;n th&igrave; ph&#7843;i c&agrave;ng ph&#7859;ng, nh&#432;ng n&oacute; &#273;ang l&agrave; ng&#432;&#7907;c l&#7841;i. T&ocirc;i &#273;&#7883;nh ngh&#297;a n&oacute; th&agrave;nh: E = (0,5L &ndash; H)\/0,5L. Nh&#432; v&#7853;y, khi chi&#7873;u cao v&ograve;m H b&#7857;ng b&aacute;n k&iacute;nh c&#7911;a v&ograve;m b&aacute;n nguy&#7879;t 0,5L, th&igrave; s&#7869; kh&ocirc;ng c&oacute; &#273;&#7897; ph&#7859;ng (l&uacute;c n&agrave;y c&#7847;u l&agrave; d&#7841;ng h&igrave;nh b&aacute;n nguy&#7879;t), t&#7881; l&#7879; ph&#7859;ng s&#7869; l&agrave; 0; khi chi&#7873;u cao v&ograve;m H gi&#7843;m, tr&#7883; s&#7889; (0,5L &ndash; H) s&#7869; d&#7847;n d&#7847;n t&#259;ng th&ecirc;m, t&#7881; l&#7879; ph&#7859;ng s&#7869; t&#259;ng (s&#7869; c&agrave;ng ph&#7859;ng h&#417;n), h&#7907;p v&#7899;i logic, nh&#432; v&#7853;y m&#7899;i ph&ugrave; h&#7907;p v&#7899;i th&#7921;c t&#7871;. Theo c&aacute;ch t&iacute;nh n&agrave;y, t&#7881; l&#7879; ph&#7859;ng c&#7911;a c&#7847;u An T&#7871; E = 0,614 (c&#7921;c k&#7923; g&#7847;n v&#7899;i &#273;i&#7875;m v&agrave;ng l&agrave; 0,618). T&#7881; l&#7879; ph&#7859;ng c&oacute; gi&aacute; tr&#7883; l&#7899;n nh&#7845;t l&agrave; 1, l&uacute;c n&agrave;y &#273;&#7897; cao c&#7911;a v&ograve;m s&#7869; b&#7857;ng 0, t&#7913;c l&agrave; kh&ocirc;ng c&ograve;n c&#7845;u tr&uacute;c m&aacute;i v&ograve;m n&#7919;a, s&#7869; ngang v&#7899;i m&#7863;t n&#432;&#7899;c. C&#7843; hai lo&#7841;i &#273;&#7883;nh ngh&#297;a &#273;&#7873;u kh&ocirc;ng &#7843;nh h&#432;&#7903;ng &#273;&#7871;n th&#7921;c ch&#7845;t c&#7911;a v&#7845;n &#273;&#7873;.<\/p>\n<ul class=\"gallery mw-gallery-traditional\">\n<li class=\"gallerybox\">\n<div class=\"thumb\"><a href=\"https:\/\/chanhkien.org\/wp-content\/uploads\/2023\/08\/920CC4F3-D8E9-45E2-89A3-52F6865A3766.png\"><img decoding=\"async\" class=\"aligncenter size-full wp-image-31056\" src=\"https:\/\/chanhkien.org\/wp-content\/uploads\/2023\/08\/920CC4F3-D8E9-45E2-89A3-52F6865A3766.png\" alt=\"\" width=\"450\" height=\"542\" srcset=\"https:\/\/chanhkien.org\/wp-content\/uploads\/2023\/08\/920CC4F3-D8E9-45E2-89A3-52F6865A3766.png 450w, https:\/\/chanhkien.org\/wp-content\/uploads\/2023\/08\/920CC4F3-D8E9-45E2-89A3-52F6865A3766-249x300.png 249w\" sizes=\"(max-width: 450px) 100vw, 450px\" \/><\/a><\/div>\n<div class=\"gallerytext\"><\/div>\n<\/li>\n<\/ul>\n<p>Kh&#7849;u &#273;&#7897; nh&#7883;p c&#7911;a cung v&ograve;m &ndash; d&#7847;m C&#7847;u An T&#7871; d&agrave;i, c&oacute; &#273;&#7897; d&agrave;y c&#7911;a v&ograve;m l&agrave; 1,32m, con s&#7889; n&agrave;y so v&#7899;i &#273;&#7897; d&agrave;i cung v&ograve;m kho&#7843;ng 43m th&igrave; th&#7853;t s&#7921; qu&aacute; m&#7887;ng.<\/p>\n<p><span id=\"2._Vai_tho&aacute;ng_&ldquo;m&#7889;_v&ograve;m_tr&#7889;ng&rdquo;\"><\/span><strong><span id=\"2._Vai_tho.C3.A1ng_.E2.80.9Cm.E1.BB.91_v.C3.B2m_tr.E1.BB.91ng.E2.80.9D\" class=\"mw-headline\">2. Vai tho&aacute;ng &ldquo;m&#7889; v&ograve;m tr&#7889;ng&rdquo;<\/span><\/strong><\/p>\n<p>Hai b&ecirc;n vai c&#7847;u (g&#7885;i l&agrave; m&#7889; c&#7847;u) c&oacute; nh&#7919;ng v&ograve;m tho&aacute;ng, nh&#7919;ng v&#7883; tr&iacute; &#273;&oacute; th&ocirc;ng th&#432;&#7901;ng &#273;&#432;&#7907;c x&acirc;y k&iacute;n b&#7857;ng &#273;&aacute;, nh&#432;ng c&#7847;u An T&#7871; l&#7841;i kh&ocirc;ng x&acirc;y k&iacute;n m&#7889; c&#7847;u, m&agrave; l&agrave;m th&ecirc;m nh&#7919;ng v&ograve;m cu&#7889;n nh&#7887; cho ph&eacute;p l&#7907;i d&#7909;ng kh&ocirc;ng gian. M&#7895;i b&ecirc;n m&#7889; c&#7847;u l&agrave;m th&ecirc;m m&#7897;t v&ograve;m l&#7899;n v&agrave; m&#7897;t v&ograve;m nh&#7887;, t&#7893;ng c&oacute; b&#7889;n v&ograve;m, g&#7885;i l&agrave; &ldquo;vai tho&aacute;ng m&#7889; v&ograve;m tr&#7889;ng&rdquo;, gi&uacute;p ti&#7871;t ki&#7879;m v&#7853;t li&#7879;u &#273;&aacute;, gi&#7843;m b&#7899;t tr&#7885;ng l&#432;&#7907;ng c&#7911;a c&#7847;u. &#431;&#7899;c t&iacute;nh l&#432;&#7907;ng &#273;&aacute; ti&#7871;t ki&#7879;m &#273;&#432;&#7907;c l&ecirc;n &#273;&#7871;n 180 kh&#7889;i, tr&#7885;ng l&#432;&#7907;ng c&#7847;u gi&#7843;m nh&#7865; &#273;&#432;&#7907;c t&#7915; 500 &ndash; 700 t&#7845;n. C&#7847;u n&#7863;ng c&oacute; v&#7867; nh&#432; &#7893;n &#273;&#7883;nh, nh&#432;ng th&#7901;i gian l&acirc;u d&#7877; d&#7851;n &#273;&#7871;n s&#7909;t l&uacute;n, ngo&agrave;i ra vi&#7879;c l&#7921;c &eacute;p l&ecirc;n v&#7853;t li&#7879;u &#273;&aacute; t&#259;ng n&ecirc;n d&#7877; b&#7883; h&#432; h&#7887;ng, h&#417;n n&#7919;a &ldquo;x&acirc;y m&#7889; k&iacute;n&rdquo; th&igrave; s&#7913;c n&#432;&#7899;c khi l&#361; l&#7909;t &#273;&#7849;y v&agrave;o m&#7863;t h&ocirc;ng c&#7847;u s&#7869; l&#7899;n h&#417;n. V&agrave;o m&ugrave;a l&#361; khi m&#7921;c n&#432;&#7899;c l&#361; d&acirc;ng cao, b&#7889;n c&aacute;i v&ograve;m n&agrave;y c&oacute; th&#7875; cho d&ograve;ng n&#432;&#7899;c qua, l&agrave;m gi&#7843;m l&#7921;c &#273;&#7849;y c&#7911;a n&#432;&#7899;c t&aacute;c &#273;&#7897;ng l&ecirc;n th&acirc;n c&#7847;u, gi&#7843;m kh&#7843; n&#259;ng n&#432;&#7899;c l&#361; tr&agrave;n l&ecirc;n b&#7901;, nh&#7901; &#273;&oacute; t&#259;ng h&#7879; s&#7889; an to&agrave;n c&#7911;a c&#7847;u An T&#7871;, nh&#7845;t c&#7917; &#273;a &#273;&#7855;c (l&agrave;m m&#7897;t vi&#7879;c m&agrave; &#273;&#432;&#7907;c nhi&#7873;u l&#7907;i &iacute;ch)!<\/p>\n<p>C&oacute; ng&#432;&#7901;i n&oacute;i lo&#7841;i c&#7847;u c&oacute; k&#7871;t c&#7845;u &ldquo;m&#7889; v&ograve;m tr&#7889;ng&rdquo; n&agrave;y, &#7903; n&#432;&#7899;c ngo&agrave;i nh&#432; t&#7841;i Ch&acirc;u &Acirc;u &#273;&#7871;n th&#7871; k&#7927; 14 m&#7899;i xu&#7845;t hi&#7879;n, &#273;&oacute; l&agrave; c&acirc;y c&#7847;u C&eacute;ret Devil tr&ecirc;n s&ocirc;ng Teches n&#432;&#7899;c Ph&aacute;p, &#273;&#432;&#7907;c x&acirc;y sau c&#7847;u An T&#7871; h&#417;n 700 n&#259;m, nh&#432;ng &#273;&atilde; b&#7883; ph&aacute; h&#7911;y t&#7915; l&acirc;u.<\/p>\n<p>T&#7915; m&#7863;t c&#7855;t ngang m&agrave; nh&igrave;n (theo h&#432;&#7899;ng tr&#7909;c c&#7911;a d&ograve;ng s&ocirc;ng), c&#7847;u An T&#7871; c&oacute; di&#7879;n t&iacute;ch kh&ocirc;ng l&#7899;n, tr&ecirc;n d&#432;&#7899;i v&ocirc; c&ugrave;ng h&#7865;p, ngo&#7841;i tr&#7915; ph&#7847;n di&#7879;n t&iacute;ch l&#7899;n chi&#7871;m b&#7903;i m&#7863;t s&#432;&#7901;n c&#7911;a &#273;&#432;&#7901;ng &#273;i v&agrave; lan can c&#7847;u ra, ch&#7881; c&oacute; m&#7897;t thanh d&#7847;m h&igrave;nh cong r&#7845;t h&#7865;p. V&#7899;i thi&#7871;t k&#7871; nh&#432; v&#7853;y, cho d&ugrave; m&#7921;c n&#432;&#7899;c l&#361; c&oacute; d&acirc;ng cao, c&#361;ng c&oacute; th&#7875; gi&#7843;m thi&#7875;u t&#7889;i &#273;a l&#7921;c c&#7843;n l&ecirc;n d&ograve;ng n&#432;&#7899;c, gi&#7843;m thi&#7875;u t&#7889;i &#273;a s&#7913;c n&#432;&#7899;c l&#361; &#273;&aacute;nh v&agrave;o h&ocirc;ng c&#7847;u.<\/p>\n<p>Tuy chi&#7873;u cao v&ograve;m c&#7847;u An T&#7871; kh&ocirc;ng cao, nh&#432;ng b&#7903;i v&igrave; kh&#7849;u &#273;&#7897; nh&#7883;p l&#7899;n n&ecirc;n &#7903; gi&#7919;a v&#7851;n &#273;&#7911; cao, v&igrave; th&#7871; thuy&#7873;n l&#7899;n &#273;i qua kh&ocirc;ng g&#7863;p v&#7845;n &#273;&#7873; g&igrave;.<\/p>\n<p>T&ocirc;i cho r&#7857;ng t&iacute;nh &#7893;n &#273;&#7883;nh c&#7911;a nh&#7919;ng c&acirc;y c&#7847;u x&acirc;y b&#7857;ng &#273;&aacute; kh&ocirc;ng ph&#7843;i do tr&#7885;ng l&#432;&#7907;ng v&ocirc; c&ugrave;ng l&#7899;n c&#7911;a n&oacute;, m&agrave; l&agrave; v&igrave; k&#7871;t c&#7845;u &ldquo;ph&#7859;ng&rdquo; c&#7911;a di&#7879;n t&iacute;ch m&#7863;t b&ecirc;n, k&#7871;t c&#7845;u h&igrave;nh v&ograve;m, &#273;&#7897; cao v&ograve;m nh&#7887; v&agrave; k&#7929; thu&#7853;t x&acirc;y d&#7921;ng kh&eacute;o l&eacute;o. Ch&uacute;ng ta s&#7869; c&ugrave;ng ph&acirc;n t&iacute;ch ph&iacute;a d&#432;&#7899;i &#273;&acirc;y.<\/p>\n<p>&ldquo;K&#7871;t c&#7845;u v&ograve;m&rdquo; khi&#7871;n cho d&#432;&#7899;i t&aacute;c d&#7909;ng c&#7911;a tr&#7885;ng l&#7921;c, l&#7921;c gi&#7919;a c&aacute;c vi&ecirc;n &#273;&aacute; s&#7869; &#273;&#432;&#7907;c truy&#7873;n t&#7843;i &#273;&#7871;n hai &#273;&#7847;u m&oacute;ng c&#7911;a c&#7847;u, gi&#7919;a c&aacute;c kh&#7889;i &#273;&aacute; s&#7869; ph&aacute;t sinh &ldquo;l&#7921;c n&eacute;n&rdquo; ch&#7913; kh&ocirc;ng ph&#7843;i l&#7921;c k&eacute;o, m&agrave; &#273;&aacute; l&#7841;i ch&#7883;u l&#7921;c n&eacute;n kh&aacute; t&#7889;t, &#273;&acirc;y l&agrave; &#273;&#7863;c t&iacute;nh c&#417; h&#7885;c c&#7911;a &#273;&aacute;. &#272;i&#7873;u n&agrave;y c&#361;ng ch&iacute;nh l&agrave; nguy&ecirc;n nh&acirc;n v&igrave; sao ph&#7847;n &#273;&#7881;nh c&#7911;a nh&#7919;ng khoang ng&#7847;m x&acirc;y d&#432;&#7899;i l&ograve;ng &#273;&#7845;t (&#273;&#432;&#7901;ng h&#7847;m, &#273;&#432;&#7901;ng h&#7847;m l&ograve;) th&#432;&#7901;ng &#273;&#432;&#7907;c x&acirc;y v&#7899;i c&#7845;u tr&uacute;c m&aacute;i v&ograve;m.<\/p>\n<p><span id=\"3._Hai_m&#432;&#417;i_t&aacute;m_&#273;&#432;&#7901;ng_v&ograve;m_cu&#7889;n_h&#7865;p_x&#7871;p_song_song\"><\/span><strong><span id=\"3._Hai_m.C6.B0.C6.A1i_t.C3.A1m_.C4.91.C6.B0.E1.BB.9Dng_v.C3.B2m_cu.E1.BB.91n_h.E1.BA.B9p_x.E1.BA.BFp_song_song\" class=\"mw-headline\">3. Hai m&#432;&#417;i t&aacute;m &#273;&#432;&#7901;ng v&ograve;m cu&#7889;n h&#7865;p x&#7871;p song song<\/span><\/strong><\/p>\n<p>C&#7847;u An T&#7871;, ch&acirc;n v&ograve;m r&#7897;ng 9.6m, &#273;&#7881;nh v&ograve;m r&#7897;ng 9m, l&agrave;n gi&#7919;a d&agrave;nh cho ng&#7921;a v&agrave; xe qua l&#7841;i, hai l&agrave;n hai b&ecirc;n d&agrave;nh cho ng&#432;&#7901;i &#273;i b&#7897;, &#273;&acirc;y l&agrave; c&acirc;y c&#7847;u t&#432;&#417;ng &#273;&#7889;i r&#7897;ng r&atilde;i. &#272;&#7875; x&acirc;y d&#7921;ng &#273;&#432;&#7907;c m&#7897;t c&acirc;y c&#7847;u r&#7897;ng nh&#432; v&#7853;y qu&#7843; th&#7921;c c&#7847;n kh&aacute; nhi&#7873;u &#273;&aacute;. Trong ph&#432;&#417;ng ph&aacute;p x&acirc;y d&#7921;ng th&ocirc;ng th&#432;&#7901;ng, t&#7915;ng vi&ecirc;n (vi&ecirc;n &#273;&aacute;) s&#7869; &#273;&#432;&#7907;c x&#7871;p so le theo h&agrave;ng ngang tr&ecirc;n d&#432;&#7899;i, nh&#7857;m &#273;&#7841;t &#273;&#432;&#7907;c t&aacute;c d&#7909;ng v&#7919;ng ch&#7855;c t&#7893;ng th&#7875;, c&oacute; th&#7875; g&#7885;i t&ecirc;n l&agrave; &ldquo;ki&#7875;u li&ecirc;n k&#7871;t d&#7885;c&rdquo;. Nh&#432;ng c&#7845;u tr&uacute;c v&ograve;m c&#7911;a c&#7847;u An T&#7871; l&#7841;i kh&ocirc;ng s&#7917; d&#7909;ng ph&#432;&#417;ng ph&aacute;p n&agrave;y, m&agrave; s&#7917; d&#7909;ng c&#7845;u tr&uacute;c &ldquo;ki&#7875;u song song&rdquo;, t&#7913;c l&agrave; 28 &#273;&#432;&#7901;ng v&ograve;m cu&#7889;n h&#7865;p &#273;&#432;&#7907;c s&#7855;p x&#7871;p song song kh&iacute;t nhau, m&#7895;i &#273;&#432;&#7901;ng r&#7897;ng kho&#7843;ng 350mm.<\/p>\n<ul class=\"gallery mw-gallery-traditional\">\n<li class=\"gallerybox\">\n<div class=\"thumb\"><a href=\"https:\/\/chanhkien.org\/wp-content\/uploads\/2023\/08\/2AED82CD-85E6-42DD-889A-F24E921F0773.jpeg\"><img decoding=\"async\" class=\"aligncenter size-full wp-image-31057\" src=\"https:\/\/chanhkien.org\/wp-content\/uploads\/2023\/08\/2AED82CD-85E6-42DD-889A-F24E921F0773.jpeg\" alt=\"\" width=\"450\" height=\"308\" srcset=\"https:\/\/chanhkien.org\/wp-content\/uploads\/2023\/08\/2AED82CD-85E6-42DD-889A-F24E921F0773.jpeg 450w, https:\/\/chanhkien.org\/wp-content\/uploads\/2023\/08\/2AED82CD-85E6-42DD-889A-F24E921F0773-300x205.jpeg 300w\" sizes=\"(max-width: 450px) 100vw, 450px\" \/><\/a><\/div>\n<div class=\"gallerytext\"><\/div>\n<\/li>\n<\/ul>\n<p>T&#7841;i sao ph&#7843;i d&ugrave;ng k&#7871;t c&#7845;u t&#7893; h&#7907;p nhi&#7873;u &#273;&#432;&#7901;ng v&ograve;m cu&#7889;n h&#7865;p song song nh&#432; v&#7853;y? B&#7843;n th&acirc;n t&ocirc;i cho r&#7857;ng, b&#7903;i v&igrave; &#273;&acirc;y l&agrave; k&#7871;t c&#7845;u c&#7847;u v&ograve;m m&#7897;t t&#7847;ng (tr&ecirc;n m&#7863;t c&#7847;u c&oacute; r&#7843;i m&#7897;t l&#7899;p &#273;&aacute; b&#7843;o v&#7879; v&ograve;m c&#7847;u), &ldquo;ki&#7875;u li&ecirc;n k&#7871;t d&#7885;c&rdquo; trong x&acirc;y c&#7847;u g&#7847;n nh&#432; kh&ocirc;ng c&oacute; &yacute; ngh&#297;a g&igrave; l&#7899;n, m&agrave; ng&#432;&#7907;c l&#7841;i r&#7845;t kh&oacute; thi c&ocirc;ng, s&#7917;a ch&#7919;a c&#361;ng kh&oacute; kh&#259;n. Nh&#432;ng &ldquo;ki&#7875;u song song&rdquo; th&igrave; l&#7841;i d&#7877; d&agrave;ng h&#417;n nhi&#7873;u, kh&#7889;i &#273;&aacute; n&agrave;o b&#7883; h&#7887;ng, thay &#273;i c&#361;ng d&#7877; d&agrave;ng. V&#7899;i ki&#7875;u x&#7871;p li&ecirc;n k&#7871;t d&#7885;c th&agrave;nh m&#7897;t kh&#7889;i h&#7907;p nh&#7845;t, b&#7873; ngo&agrave;i c&oacute; v&#7867; nh&#432; ki&ecirc;n c&#7889; nh&#432;ng &#273;&#7897; gi&ograve;n l&#7899;n, n&#7871;u g&#7863;p ch&#7845;n &#273;&#7897;ng m&#7841;nh (nh&#432; &#273;&#7897;ng &#273;&#7845;t) c&oacute; kh&#7843; n&#259;ng d&#7877; b&#7883; t&#7893;n h&#7841;i.<\/p>\n<p>Khung x&#432;&#417;ng c&#7911;a c&#7847;u An T&#7871; &ndash; d&#7847;m v&ograve;m, &#273;&#432;&#7907;c x&acirc;y b&#7857;ng nh&#7919;ng vi&ecirc;n &#273;&aacute; sa th&#7841;ch, gh&eacute;p h&#7871;t s&#7913;c kh&iacute;t v&agrave;o nhau, kh&ocirc;ng d&ugrave;ng b&#7845;t c&#7913; lo&#7841;i v&#7853;t li&#7879;u k&#7871;t d&iacute;nh n&agrave;o nh&#432; v&#7919;a, c&aacute;ch x&acirc;y n&agrave;y g&#7885;i l&agrave; &ldquo;x&acirc;y kh&ocirc;&rdquo;, v&ocirc; c&ugrave;ng ng&#259;n n&#7855;p s&#7841;ch s&#7869;, kh&ocirc;ng gi&#7889;ng nh&#432; nh&#7919;ng c&aacute;ch x&acirc;y t&#432;&#7901;ng x&acirc;y nh&agrave; th&ocirc;ng th&#432;&#7901;ng. T&iacute;nh &#7893;n &#273;&#7883;nh v&agrave; t&iacute;nh ki&ecirc;n c&#7889; c&#7911;a n&oacute; ch&#7881; d&#7921;a v&agrave;o &#273;&#7863;c t&iacute;nh c&#417; h&#7885;c c&#7911;a k&#7871;t c&#7845;u h&igrave;nh v&ograve;m, d&#7921;a v&agrave;o l&#7921;c n&eacute;n gi&#7919;a c&aacute;c vi&ecirc;n &#273;&aacute; v&#7899;i nhau &#273;&#7875; duy tr&igrave; s&#7921; c&acirc;n b&#7857;ng, n&#7871;u g&#7863;p ph&#7843;i nhi&#7877;u &#273;&#7897;ng t&#7841;o n&ecirc;n l&#7921;c k&eacute;o ngo&agrave;i &yacute; mu&#7889;n, th&igrave; c&oacute; th&#7875; khi&#7871;n cho gi&#7919;a c&aacute;c vi&ecirc;n &#273;&aacute; xu&#7845;t hi&#7879;n khuynh h&#432;&#7899;ng t&aacute;ch r&#7901;i ra. Gi&#7919;a c&aacute;c v&ograve;m k&#7871;t n&#7889;i h&#432;&#7899;ng ngang c&#361;ng kh&ocirc;ng c&oacute; v&#7919;a k&#7871;t d&iacute;nh.<\/p>\n<p>&#272;&#7875; lo&#7841;i b&#7887; nh&#7919;ng nguy hi&#7875;m ti&#7873;m &#7849;n c&#7911;a kh&#7843; n&#259;ng t&aacute;ch r&#7901;i c&#7911;a 28 &#273;&#432;&#7901;ng v&ograve;m h&#7865;p song song, thi&#7871;t k&#7871; c&#7911;a L&yacute; Xu&acirc;n &#273;&atilde; s&#7917; d&#7909;ng c&aacute;c bi&#7879;n ph&aacute;p nh&#432; sau:<\/p>\n<p>Hai &#273;&#7847;u v&ograve;m h&#417;i r&#7897;ng ra, thu h&#7865;p d&#7847;n v&#7873; ph&iacute;a trung t&acirc;m v&ograve;m, t&iacute;nh ra trung t&acirc;m h&#7865;p h&#417;n hai &#273;&#7847;u 0,5m. &#272;i&#7873;u n&agrave;y gi&uacute;p cho m&aacute;i v&ograve;m d&#432;&#7899;i t&aacute;c d&#7909;ng c&#7911;a tr&#7885;ng l&#7921;c c&oacute; ph&acirc;n l&#7921;c (l&#7921;c h&#432;&#7899;ng t&acirc;m) nghi&ecirc;ng v&#7873; ph&iacute;a trong, th&uacute;c &#273;&#7849;y c&aacute;c &#273;&#432;&#7901;ng v&ograve;m &#7903; gi&#7919;a &aacute;p s&aacute;t v&agrave;o nhau h&#417;n! &#272;&uacute;ng l&agrave; m&#7897;t &yacute; t&#432;&#7903;ng hay! V&#7873; h&igrave;nh tr&#7841;ng th&igrave; gi&#7889;ng nh&#432; v&ograve;ng eo c&#7911;a con ki&#7871;n &ldquo;&#273;&#7841;i l&#7921;c s&#297;&rdquo;, v&ograve;ng eo c&#7911;a con ng&#432;&#7901;i c&#361;ng l&agrave; h&igrave;nh d&aacute;ng thu nh&#7887; l&#7841;i nh&#432; th&#7871;. C&oacute; l&#7869; h&igrave;nh d&aacute;ng n&agrave;y th&#432;&#7901;ng sinh ra c&aacute;c &#273;&#7863;c &#273;i&#7875;m c&#417; h&#7885;c nh&#432; v&#7853;y.<\/p>\n<p>D&#7885;c theo nh&#7883;p c&#7847;u c&#7913; c&aacute;ch m&#7897;t &#273;o&#7841;n c&#7921; ly ng&#7855;n &#273;&#432;&#7907;c b&#7889; tr&iacute; m&#7897;t thanh gi&#7857;ng th&eacute;p, t&#7893;ng c&#7897;ng n&#259;m thanh, xuy&ecirc;n theo h&agrave;ng ngang 28 &#273;&#432;&#7901;ng v&ograve;m cu&#7889;n, hai &#273;&#7847;u thanh gi&#7857;ng c&oacute; kh&oacute;a h&igrave;nh b&aacute;n nguy&#7879;t l&#7897; ra b&ecirc;n ngo&agrave;i kh&#7889;i &#273;&aacute;, k&#7865;p ch&#7863;t 28 &#273;&#432;&#7901;ng v&ograve;m cu&#7889;n c&#7889; &#273;&#7883;nh gi&#7889;ng nh&#432; &#273;&#432;&#7907;c c&#7897;t ch&#7863;t v&agrave;o nhau. Trong c&aacute;c &#273;&#432;&#7901;ng ng&#7847;m c&#7911;a h&#7847;m m&#7887;, c&oacute; m&#7897;t k&#7929; thu&#7853;t h&#7895; tr&#7907; &#273;&oacute;ng thanh neo t&#7841;i &#273;&#7881;nh v&agrave; b&ecirc;n h&ocirc;ng v&agrave; th&ecirc;m phun b&ecirc; t&ocirc;ng, c&#361;ng l&agrave; nguy&ecirc;n l&yacute; nh&#432; v&#7853;y.<\/p>\n<p>D&#7847;m v&ograve;m &#273;&#432;&#7907;c gh&eacute;p th&agrave;nh b&#7857;ng nh&#7919;ng vi&ecirc;n &#273;&aacute; l&#7899;n, &#273;&#7897; d&agrave;y kho&#7843;ng 1 m&eacute;t, ph&iacute;a tr&ecirc;n m&#7863;t &#273;&#432;&#7907;c ph&#7911; m&#7897;t l&#7899;p &#273;&aacute; m&#7887;ng (d&#7921;a theo v&ograve;m), c&#361;ng c&oacute; th&#7875; g&#7885;i l&agrave; &ldquo;&#273;&aacute; b&#7843;o v&#7879; v&ograve;m&rdquo;, &#273;&#7897; d&agrave;y kho&#7843;ng 0,3m, &#273;&#432;&#7907;c x&#7871;p so le v&#7899;i h&agrave;ng ph&iacute;a d&#432;&#7899;i. Hai l&#7899;p h&#7907;p l&#7841;i th&agrave;nh &#273;&#7897; d&agrave;y c&#7911;a v&ograve;m d&#7847;m l&agrave; 1,32m. &#7902; hai l&#7899;p &#273;&aacute; b&#7843;o v&#7879; v&ograve;m h&#7865;p ngo&agrave;i c&ugrave;ng, c&oacute; s&aacute;u vi&ecirc;n &ldquo;&#273;&aacute; m&oacute;c&rdquo; b&#7889; tr&iacute; c&aacute;ch xa nhau, m&oacute;c v&agrave;o c&aacute;c kh&#7889;i &#273;&aacute; c&#7911;a v&ograve;m ch&iacute;nh &#273;&#7875; ch&uacute;ng &ldquo;kh&ocirc;ng th&#7875; t&aacute;ch r&#7901;i&rdquo;. (Xem h&igrave;nh d&#432;&#7899;i)<\/p>\n<ul class=\"gallery mw-gallery-traditional\">\n<li class=\"gallerybox\">\n<div class=\"thumb\"><a href=\"https:\/\/chanhkien.org\/wp-content\/uploads\/2023\/08\/7F8A4851-69F5-4B51-AD3D-827FB0159345.jpeg\"><img decoding=\"async\" class=\"aligncenter size-full wp-image-31058\" src=\"https:\/\/chanhkien.org\/wp-content\/uploads\/2023\/08\/7F8A4851-69F5-4B51-AD3D-827FB0159345.jpeg\" alt=\"\" width=\"450\" height=\"300\" srcset=\"https:\/\/chanhkien.org\/wp-content\/uploads\/2023\/08\/7F8A4851-69F5-4B51-AD3D-827FB0159345.jpeg 450w, https:\/\/chanhkien.org\/wp-content\/uploads\/2023\/08\/7F8A4851-69F5-4B51-AD3D-827FB0159345-300x200.jpeg 300w\" sizes=\"(max-width: 450px) 100vw, 450px\" \/><\/a><\/div>\n<\/li>\n<\/ul>\n<p>&#272;&#7875; lo&#7841;i b&#7887; nguy c&#417; ti&#7873;m &#7849;n t&aacute;ch r&#7901;i ra theo h&#432;&#7899;ng d&#7885;c c&#7911;a &#273;&#432;&#7901;ng v&ograve;m:<\/p>\n<p>Hai m&#7863;t ngo&agrave;i c&ugrave;ng c&#7911;a v&ograve;m l&#7899;n, gi&#7919;a c&aacute;c vi&ecirc;n &#273;&aacute; li&#7873;n k&#7873; &#273;&#432;&#7907;c s&#7917; d&#7909;ng hai b&#7897; &ldquo;ch&#7889;t eo s&#7855;t&rdquo; &#273;&#7875; li&ecirc;n k&#7871;t &#7903; b&ecirc;n ngo&agrave;i (ki&#7875;u n&#7889;i &#273;inh t&aacute;n). C&ograve;n &#7903; b&ecirc;n trong c&aacute;c &#273;&#432;&#7901;ng v&ograve;m, th&igrave; t&#7841;i ph&iacute;a l&#432;ng v&ograve;m cu&#7889;n gi&#7919;a hai vi&ecirc;n &#273;&aacute; li&#7873;n k&#7873; &#273;&#432;&#7907;c t&aacute;n b&#7857;ng ch&#7889;t eo s&#7855;t, li&ecirc;n k&#7871;t l&#7841;i v&#7899;i nhau. Nh&#432; v&#7853;y c&oacute; th&#7875; t&#259;ng c&#432;&#7901;ng t&iacute;nh t&#7893;ng th&#7875; c&#7911;a v&ograve;m v&agrave; c&#432;&#7901;ng &#273;&#7897; ch&#7883;u l&#7921;c, &#273;&#7863;c bi&#7879;t l&agrave; gia t&#259;ng kh&#7843; n&#259;ng l&#7921;c k&eacute;o c&#7911;a v&ograve;m, v&igrave; t&iacute;nh kh&aacute;ng l&#7921;c k&eacute;o c&#7911;a v&#7853;t li&#7879;u th&eacute;p r&#7845;t &#432;u vi&#7879;t, &#273;&#7875; d&#7921; ph&ograve;ng nh&#7919;ng t&igrave;nh hu&#7889;ng b&#7845;t ng&#7901; khi&#7871;n v&ograve;m ch&#7883;u l&#7921;c k&eacute;o. &#7902; gi&#7919;a &#273;&#432;&#7901;ng v&ograve;m nh&#7887; c&#7841;nh nhau, b&ecirc;n h&ocirc;ng m&#7895;i vi&ecirc;n &#273;&aacute; x&acirc;y v&ograve;m &#273;&#7873;u &#273;&#432;&#7907;c kh&#7855;c hoa v&#259;n tinh t&#7871;, &#273;&#7875; t&#259;ng h&#7879; s&#7889; ma s&aacute;t gi&#7919;a c&aacute;c &#273;&#432;&#7901;ng v&ograve;m v&#7899;i nhau (m&#7863;t h&ocirc;ng) (d&#432;&#7901;ng nh&#432; r&#7845;t nh&#7887;).<\/p>\n<p>Nh&#7919;ng bi&#7879;n ph&aacute;p n&agrave;y l&agrave;m d&#7847;m c&#7847;u li&ecirc;n k&#7871;t th&agrave;nh m&#7897;t kh&#7889;i, t&#259;ng c&#432;&#7901;ng l&#7921;c cho d&#7847;m, t&#259;ng t&iacute;nh &#7893;n &#273;&#7883;nh v&agrave; an to&agrave;n cho d&#7847;m.<\/p>\n<p>Theo t&#432; li&#7879;u, c&#7847;u An T&#7871; (c&#7847;u Tri&#7879;u Ch&acirc;u) tr&#7843;i qua 10 l&#7847;n l&#361; l&#7909;t, t&aacute;m tr&#7853;n chi&#7871;n lo&#7841;n v&agrave; r&#7845;t nhi&#7873;u tr&#7853;n &#273;&#7897;ng &#273;&#7845;t, bao g&#7891;m tr&#7853;n &#273;&#7897;ng &#273;&#7845;t m&#7841;nh 7,2 &#273;&#7897; richter v&agrave;o n&#259;m 1966 &#7903; H&igrave;nh &#272;&agrave;i, tr&#7853;n &#273;&#7897;ng &#273;&#7845;t n&agrave;y c&aacute;ch c&#7847;u Tri&#7879;u Ch&acirc;u ch&#7881; 40km, m&agrave; kh&ocirc;ng h&#7873; b&#7883; s&#7853;p.<\/p>\n<p>(C&ograve;n ti&#7871;p)<\/p>\n<p>D&#7883;ch t&#7915;: <a class=\"external free\" href=\"https:\/\/big5.zhengjian.org\/node\/281447\" rel=\"nofollow\">https:\/\/big5.zhengjian.org\/node\/281447<\/a><\/p>\n<div id=\"catlinks\" class=\"catlinks\" data-mw=\"interface\"><\/div>\n\n","protected":false},"excerpt":{"rendered":"<p>[ChanhKien.org] Phi l&#432;&#417;ng kh&iacute; th&#7871; ho&agrave;nh, B&iacute;ch th&#7911;y &#7843;nh &#273;&#7881;nh khung; &#272;&#259;ng ki&#7873;u &#273;&#7841;p th&#7843;n l&#7897;, T&#7841;o h&oacute;a nh&#7845;t k&igrave; c&ocirc;ng! Di&#7877;n ngh&#297;a: V&ograve;m c&#7847;u bay l&ecirc;n kh&ocirc;ng trung v&#7899;i kh&iacute; th&#7871; l&#7899;n, L&agrave;n n&#432;&#7899;c trong xanh ph&#7843;n chi&#7871;u m&aacute;i v&ograve;m; L&ecirc;n c&#7847;u b&#432;&#7899;c tr&ecirc;n con &#273;&#432;&#7901;ng b&#7857;ng ph&#7859;ng, Th&#7853;t l&agrave; m&#7897;t k&#7923; c&ocirc;ng c&#7911;a [&hellip;]<\/p>\n","protected":false},"author":13,"featured_media":31053,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_sitemap_exclude":false,"_sitemap_priority":"","_sitemap_frequency":"","ngg_post_thumbnail":0,"footnotes":""},"categories":[304,103],"tags":[444],"class_list":["post-31052","post","type-post","status-publish","format-standard","hentry","category-loat-bai","category-vanhoa-truyenthong","tag-cau-trieu-chau"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Th\u1ea3o lu\u1eadn v\u1ec1 v\u0103n minh 5000 n\u0103m Trung Hoa: C\u1ea7u Tri\u1ec7u Ch\u00e2u (Ph\u1ea7n 1) - Ch\u00e1nh Ki\u1ebfn Net<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/chanhkien.org\/2023\/08\/thao-luan-ve-van-minh-5000-nam-trung-hoa-cau-trieu-chau-phan-1.html\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Th\u1ea3o lu\u1eadn v\u1ec1 v\u0103n minh 5000 n\u0103m Trung Hoa: C\u1ea7u Tri\u1ec7u Ch\u00e2u (Ph\u1ea7n 1) - Ch\u00e1nh Ki\u1ebfn Net\" \/>\n<meta property=\"og:description\" content=\"[ChanhKien.org] Phi l&#432;&#417;ng kh&iacute; th&#7871; ho&agrave;nh, B&iacute;ch th&#7911;y &#7843;nh &#273;&#7881;nh khung; &#272;&#259;ng ki&#7873;u &#273;&#7841;p th&#7843;n l&#7897;, T&#7841;o h&oacute;a nh&#7845;t k&igrave; c&ocirc;ng! 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