{"id":647,"date":"2025-06-05T08:07:06","date_gmt":"2025-06-05T08:07:06","guid":{"rendered":"https:\/\/lzbmetal.com\/?p=647"},"modified":"2025-06-23T01:27:13","modified_gmt":"2025-06-23T01:27:13","slug":"nap-ho-ga-tron-co-vong-chan","status":"publish","type":"post","link":"https:\/\/lzbmetal.com\/vi\/nap-ho-ga-tron-co-vong-chan\/","title":{"rendered":"N\u1eafp h\u1ed1 ga tr\u00f2n b\u1eb1ng gang d\u1ebbo c\u00f3 v\u00f2ng ch\u1eb7n"},"content":{"rendered":"<h3 class=\"wp-block-heading\">I. T\u00ednh n\u0103ng k\u1ef9 thu\u1eadt<\/h3>\n\n\n\n<p><strong>1.V\u1eadt li\u1ec7u &amp; Quy tr\u00ecnh<\/strong><\/p>\n\n\n\n<p>&nbsp;-V\u1eadt li\u1ec7u \u0111\u1ebf b\u1eb1ng gang d\u1ebbo: &nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>&nbsp;&nbsp;- X\u1eed l\u00fd t\u1ea1o h\u1ea1t nguy\u00ean t\u1ed1 \u0111\u1ea5t hi\u1ebfm\/Magi\u00ea \u0111\u1ea3m b\u1ea3o ph\u00e2n b\u1ed1 than ch\u00ec h\u00ecnh c\u1ea7u. \u0110\u1ed9 b\u1ec1n k\u00e9o \u2265420 MPa, \u0111\u1ed9 gi\u00e3n d\u00e0i \u226510%, \u0111\u1ed9 b\u1ec1n va \u0111\u1eadp (\u226512 J\/cm\u00b2) v\u01b0\u1ee3t xa gang x\u00e1m (HT250), k\u1ebft h\u1ee3p kh\u1ea3 n\u0103ng ch\u1ed1ng m\u00e0i m\u00f2n c\u1ee7a gang v\u1edbi \u0111\u1ed9 b\u1ec1n c\u1ee7a th\u00e9p. &nbsp;<\/li>\n\n\n\n<li>&nbsp;&nbsp;- M\u1eadt \u0111\u1ed9 7,3 g\/cm\u00b3, kh\u00f4ng c\u00f3 gi\u00e1 tr\u1ecb tan ch\u1ea3y ph\u1ebf li\u1ec7u, gi\u1ea3m \u0111\u1ed9ng c\u01a1 tr\u1ed9m c\u1eafp ngay t\u1eeb ngu\u1ed3n. &nbsp;<\/li>\n<\/ul>\n\n\n\n<p><strong>\u00a0- Quy tr\u00ecnh ch\u1ed1ng \u0103n m\u00f2n: \u00a0<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u00a0\u00a0- Phun k\u1ebdm b\u1ec1 m\u1eb7t (l\u1edbp k\u1ebdm \u226580\u03bcm) + ph\u1ee7 nh\u1ef1a \u0111\u01b0\u1eddng ho\u1eb7c phun nh\u1ef1a epoxy. Kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n phun mu\u1ed1i \u22651000 gi\u1edd (ASTM B117), th\u00edch h\u1ee3p cho m\u00f4i tr\u01b0\u1eddng \u0111\u1ea5t v\u00e0 \u1ea9m c\u00f3 \u0111\u1ed9 pH 5-10. \u00a0<\/li>\n<\/ul>\n\n\n\n<p><strong>2.C\u1ea5u tr\u00fac an to\u00e0n kh\u00f3a l\u00f2 xo \u00a0<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>&nbsp;- Kh\u00f3a l\u00f2 xo k\u00e9p: L\u00f2 xo c\u01b0\u1eddng \u0111\u1ed9 cao t\u00edch h\u1ee3p (th\u00e9p 65Mn), y\u00eau c\u1ea7u c\u00f4ng c\u1ee5 chuy\u00ean d\u1ee5ng (v\u00ed d\u1ee5: c\u1edd l\u00ea ch\u1eef T) \u0111\u1ec3 m\u1edf. Th\u1eddi gian ph\u00e1 ho\u1ea1i \u226520 ph\u00fat, gi\u1ea3m h\u01a1n 90% s\u1ef1 c\u1ed1 tr\u1ed9m c\u1eafp. &nbsp;<\/li>\n\n\n\n<li>&nbsp;- Thi\u1ebft k\u1ebf c\u1ed1 \u0111\u1ecbnh \u0111a \u0111i\u1ec3m: 3-4 \u0111i\u1ec3m kh\u00f3a ph\u00e2n b\u1ed5 \u00e1p l\u1ef1c \u0111\u1ec1u, ng\u0103n ng\u1eeba h\u1ecfng h\u00f3c t\u1ea1i m\u1ed9t \u0111i\u1ec3m v\u00e0 t\u00ecnh tr\u1ea1ng n\u1eafp b\u1ecb d\u1ecbch chuy\u1ec3n ho\u1eb7c n\u1ea3y. &nbsp;<\/li>\n<\/ul>\n\n\n\n<p><strong>3. Thi\u1ebft k\u1ebf t\u1ed1i \u01b0u ch\u1ee9c n\u0103ng \u00a0<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>&nbsp;- B\u1ec1 m\u1eb7t ch\u1ed1ng tr\u01b0\u1ee3t: X\u1eed l\u00fd v\u00e2n kim c\u01b0\u01a1ng ho\u1eb7c v\u00e2n c\u00e1, h\u1ec7 s\u1ed1 ma s\u00e1t \u22650,65, ch\u1ed1ng tr\u01b0\u1ee3t tuy\u1ec7t v\u1eddi khi tr\u1eddi m\u01b0a\/tuy\u1ebft. &nbsp;<\/li>\n\n\n\n<li>&nbsp;- Gi\u1ea3m ti\u1ebfng \u1ed3n v\u00e0 b\u1ecbt k\u00edn: Gio\u0103ng cao su \u0111\u01b0\u1ee3c nh\u00fang trong m\u1ed1i n\u1ed1i khung n\u1eafp gi\u00fap gi\u1ea3m ti\u1ebfng \u1ed3n c\u1ee7a xe t\u1eeb 10-15 dB v\u00e0 ng\u0103n r\u00f2 r\u1ec9 n\u01b0\u1edbc th\u1ea3i. &nbsp;<\/li>\n\n\n\n<li>&nbsp;- Gia c\u1ed1 t\u1ea3i tr\u1ecdng: C\u1ea5u tr\u00fac g\u00e2n gia c\u1ed1 \u0111\u00e1y, c\u1ea5p t\u1ea3i tr\u1ecdng t\u1eeb C250 (25 t\u1ea5n) \u0111\u1ebfn E600 (60 t\u1ea5n), c\u00f3 th\u1ec3 th\u00edch \u1ee9ng v\u1edbi nhi\u1ec1u t\u00ecnh hu\u1ed1ng t\u1ea3i tr\u1ecdng kh\u00e1c nhau. &nbsp;<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">II. \u01afu \u0111i\u1ec3m c\u1ed1t l\u00f5i &nbsp;<\/h3>\n\n\n\n<p><strong>1. An to\u00e0n v\u00e0 b\u1ea3o m\u1eadt t\u1ed1i \u01b0u \u00a0<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>&nbsp;- C\u01a1 ch\u1ebf kh\u00f3a l\u00f2 xo + v\u1eadt li\u1ec7u kh\u00f4ng th\u1ec3 t\u00e1i ch\u1ebf mang l\u1ea1i kh\u1ea3 n\u0103ng b\u1ea3o m\u1eadt k\u00e9p, gi\u1ea3m 95% nguy c\u01a1 tr\u1ed9m c\u1eafp\/h\u01b0 h\u1ecfng so v\u1edbi c\u00e1c lo\u1ea1i n\u1eafp truy\u1ec1n th\u1ed1ng. &nbsp;<\/li>\n\n\n\n<li>&nbsp;- Khe h\u1edf song ch\u1eafn \u226415mm (ti\u00eau chu\u1ea9n EN 124), ng\u0103n ng\u1eeba v\u1eadt nh\u1ecf r\u01a1i v\u00e0o v\u00e0 \u0111\u1ea3m b\u1ea3o an to\u00e0n cho ng\u01b0\u1eddi \u0111i b\u1ed9. &nbsp;<\/li>\n<\/ul>\n\n\n\n<p><strong>2. \u0110\u1ed9 b\u1ec1n c\u1ef1c cao v\u00e0 kh\u1ea3 n\u0103ng ch\u1ed1ng l\u00fan \u00a0<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>&nbsp;- C\u01b0\u1eddng \u0111\u1ed9 n\u00e9n 400-600 MPa, \u0111\u1ea1t th\u1eed nghi\u1ec7m EN 124 D400 (xe c\u1ee9u h\u1ecfa 40 t\u1ea5n l\u0103n nhi\u1ec1u l\u1ea7n m\u00e0 kh\u00f4ng bi\u1ebfn d\u1ea1ng). &nbsp;<\/li>\n\n\n\n<li>&nbsp;- Thi\u1ebft k\u1ebf k\u1ebft n\u1ed1i linh ho\u1ea1t (l\u1edbp \u0111\u1ec7m cao su) cho ph\u00e9p l\u00fan n\u1ec1n m\u00f3ng \u00b13mm, ng\u0103n ng\u1eeba sai l\u1ec7ch ho\u1eb7c v\u1ee1. &nbsp;<\/li>\n<\/ul>\n\n\n\n<p><strong>3.Tu\u1ed5i th\u1ecd d\u00e0i v\u00e0 \u00edt b\u1ea3o tr\u00ec \u00a0<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u00a0- L\u1edbp ph\u1ee7 ch\u1ed1ng \u0103n m\u00f2n + v\u1eadt li\u1ec7u n\u1ec1n gang d\u1ebbo, tu\u1ed5i th\u1ecd \u226530 n\u0103m (g\u1ea5p 2-3 l\u1ea7n v\u1eadt li\u1ec7u composite). <\/li>\n\n\n\n<li>&nbsp;- Kh\u00f4ng c\u1ea7n b\u1ea3o d\u01b0\u1ee1ng s\u01a1n l\u1ea1i, v\u1ec7 sinh h\u00e0ng ng\u00e0y ch\u1ec9 c\u1ea7n r\u1eeda b\u1eb1ng n\u01b0\u1edbc \u00e1p l\u1ef1c cao. Chi ph\u00ed tr\u1ecdn \u0111\u1eddi th\u1ea5p h\u01a1n s\u1eaft x\u00e1m 40%. &nbsp;<\/li>\n<\/ul>\n\n\n\n<p><strong>4. Kh\u1ea3 n\u0103ng th\u00edch \u1ee9ng v\u1edbi m\u00f4i tr\u01b0\u1eddng \u00a0<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>&nbsp;- Kh\u1ea3 n\u0103ng ch\u1ecbu nhi\u1ec7t t\u1eeb -40\u2103 \u0111\u1ebfn 350\u2103, ch\u1ecbu \u0111\u01b0\u1ee3c chu k\u1ef3 \u0111\u00f3ng b\u0103ng-tan b\u0103ng, ph\u00f9 h\u1ee3p v\u1edbi v\u00f9ng c\u00f3 nhi\u1ec7t \u0111\u1ed9 c\u1ef1c l\u1ea1nh (v\u00ed d\u1ee5: \u0110\u00f4ng B\u1eafc Trung Qu\u1ed1c) ho\u1eb7c v\u00f9ng n\u00f3ng\/m\u01b0a (v\u00ed d\u1ee5: Nam Trung Qu\u1ed1c). &nbsp;<\/li>\n\n\n\n<li>&nbsp;- N\u00e2ng c\u1ea5p l\u1edbp ph\u1ee7 Epoxy ch\u1ed1ng l\u1ea1i axit\/ki\u1ec1m m\u1ea1nh (pH 3-12), th\u00edch h\u1ee3p cho c\u00e1c nh\u00e0 m\u00e1y h\u00f3a ch\u1ea5t ho\u1eb7c m\u00f4i tr\u01b0\u1eddng phun mu\u1ed1i ven bi\u1ec3n. &nbsp;<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">III. C\u00e1c t\u00ecnh hu\u1ed1ng \u1ee9ng d\u1ee5ng v\u00e0 kh\u1edbp t\u1ea3i &nbsp;<\/h3>\n\n\n\n<p><strong>1. Khu v\u1ef1c an ninh cao: \u00a0<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>&nbsp;- \u0110\u01b0\u1eddng cao t\u1ed1c, \u0111\u01b0\u1eddng b\u0103ng s\u00e2n bay: Thi\u1ebft k\u1ebf ch\u1ed1ng tr\u1ed9m + C\u1ea5p t\u1ea3i tr\u1ecdng D400 ng\u0103n ng\u1eeba tai n\u1ea1n giao th\u00f4ng do n\u1eafp che b\u1ecb m\u1ea5t c\u1eafp. &nbsp;<\/li>\n\n\n\n<li>&nbsp;- C\u0103n c\u1ee9 qu\u00e2n s\u1ef1, nh\u00e0 m\u00e1y h\u1ea1t nh\u00e2n: Kh\u00f3a l\u00f2 xo + v\u1eadt li\u1ec7u kh\u00f4ng th\u1ec3 t\u00e1i ch\u1ebf b\u1ea3o v\u1ec7 c\u00e1c ti\u1ec7n \u00edch ng\u1ea7m c\u1ee7a c\u00e1c c\u01a1 s\u1edf nh\u1ea1y c\u1ea3m. &nbsp;<\/li>\n<\/ul>\n\n\n\n<p><strong>2. Khu v\u1ef1c ch\u1ee9c n\u0103ng l\u00f5i \u0111\u00f4 th\u1ecb: \u00a0<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>&nbsp;- Nh\u00e0 ga t\u00e0u \u0111i\u1ec7n ng\u1ea7m, khu th\u01b0\u01a1ng m\u1ea1i: Gi\u1ea3m ti\u1ebfng \u1ed3n\/ch\u1ed1ng \u1ed3n gi\u00fap h\u1ea1n ch\u1ebf t\u1ed1i \u0111a s\u1ef1 x\u00e1o tr\u1ed9n c\u1ee7a c\u00f4ng ch\u00fang; k\u1ebft n\u1ed1i linh ho\u1ea1t th\u00edch \u1ee9ng v\u1edbi \u0111\u1ed9 l\u00fan c\u1ee7a c\u00f4ng tr\u00ecnh ng\u1ea7m. &nbsp;<\/li>\n\n\n\n<li>&nbsp;- B\u1ec7nh vi\u1ec7n, tr\u01b0\u1eddng h\u1ecdc: Khe h\u1edf ch\u1ed1ng r\u01a1i + hoa v\u0103n ma s\u00e1t cao gi\u00fap gi\u1ea3m nguy c\u01a1 tr\u01b0\u1ee3t ng\u00e3 cho ng\u01b0\u1eddi \u0111i b\u1ed9. &nbsp;<\/li>\n<\/ul>\n\n\n\n<p><strong>3.M\u00f4i tr\u01b0\u1eddng \u0111\u1eb7c bi\u1ec7t: \u00a0<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>&nbsp;- Khu v\u1ef1c ven bi\u1ec3n (v\u00ed d\u1ee5, \u0110\u01b0\u1eddng v\u00e0nh \u0111ai \u0111\u1ea3o H\u1ea1 M\u00f4n): L\u1edbp ph\u1ee7 nh\u1ef1a than epoxy ch\u1ed1ng x\u00f3i m\u00f2n ion clorua. &nbsp;<\/li>\n\n\n\n<li>&nbsp;- Khu v\u1ef1c h\u00f3a ch\u1ea5t: L\u1edbp ph\u1ee7 ch\u1ed1ng \u0103n m\u00f2n PTFE ch\u1ecbu \u0111\u01b0\u1ee3c axit\/ki\u1ec1m m\u1ea1nh b\u1eafn v\u00e0o (pH 1-14). &nbsp;<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">IV. Ti\u00eau chu\u1ea9n k\u1ef9 thu\u1eadt v\u00e0 ch\u1ee9ng nh\u1eadn &nbsp;<\/h3>\n\n\n\n<p><strong>-Ti\u00eau chu\u1ea9n qu\u1ed1c t\u1ebf: \u00a0<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>&nbsp;-EN 124 D400 (Ch\u1ecbu t\u1ea3i) &nbsp;<\/li>\n\n\n\n<li>&nbsp;-ISO 15874 (H\u1ec7 th\u1ed1ng ni\u00eam phong) &nbsp;<\/li>\n<\/ul>\n\n\n\n<p><strong>-Ti\u00eau chu\u1ea9n Trung Qu\u1ed1c: \u00a0<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>&nbsp;-GB\/T 23858-2009 &quot;N\u1eafp c\u1ed1ng&quot; &nbsp;<\/li>\n\n\n\n<li>&nbsp;-CJ\/T 512-2017 &quot;N\u1eafp c\u1ed1ng ch\u1ed1ng tr\u1ed9m c\u00f3 kh\u00f3a l\u00f2 xo&quot; &nbsp;<\/li>\n<\/ul>\n\n\n\n<p><strong>- Ch\u1ee9ng nh\u1eadn \u0111\u1eb7c bi\u1ec7t: \u00a0<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>&nbsp;- Ch\u1ee9ng nh\u1eadn s\u1ea3n ph\u1ea9m an ninh v\u00e0 b\u1ea3o v\u1ec7 c\u1ee7a B\u1ed9 C\u00f4ng an (Ch\u1ee9ng nh\u1eadn GA) &nbsp;<\/li>\n\n\n\n<li>&nbsp;- Ch\u1ee9ng nh\u1eadn ch\u1ed1ng ch\u00e1y n\u1ed5: Ex db IIC T6 Gb (Phi\u00ean b\u1ea3n c\u00f4ng nghi\u1ec7p h\u00f3a ch\u1ea5t) &nbsp;<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Ph\u1ea7n k\u1ebft lu\u1eadn &nbsp;<\/h3>\n\n\n\n<p>N\u1eafp h\u1ed1 ga l\u00f2 xo b\u1eb1ng s\u1eaft d\u1ebbo \u0111\u1ecbnh ngh\u0129a l\u1ea1i c\u00e1c ti\u00eau chu\u1ea9n b\u1ea3o v\u1ec7 cho c\u01a1 s\u1edf h\u1ea1 t\u1ea7ng c\u00f3 gi\u00e1 tr\u1ecb cao th\u00f4ng qua c\u00f4ng ngh\u1ec7 Ch\u1ed1ng tr\u1ed9m, Truy c\u1eadp nhanh trong 10 gi\u00e2y v\u00e0 Nh\u00fang tr\u01b0\u1edbc th\u00f4ng minh: &nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>1. Kh\u1ea3 n\u0103ng ch\u1ed1ng tr\u1ed9m: L\u1ef1c ch\u1ed1ng \u0111\u1ed9t nh\u1eadp 50 kN + 100.000 t\u1ed5 h\u1ee3p ph\u00edm, khi\u1ebfn m\u1ecdi n\u1ed7 l\u1ef1c tr\u1ed9m c\u1eafp tr\u1edf n\u00ean v\u00f4 \u00edch v\u00e0 kh\u00f4ng c\u00f3 l\u1ee3i nhu\u1eadn. &nbsp;<\/li>\n\n\n\n<li>2. Cu\u1ed9c c\u00e1ch m\u1ea1ng b\u1ea3o tr\u00ec: M\u1edf trong 5 gi\u00e2y + kh\u00f4ng c\u1ea7n b\u1ea3o tr\u00ec trong 10 n\u0103m, gi\u1ea3m chi ph\u00ed \u1ee9ng ph\u00f3 kh\u1ea9n c\u1ea5p c\u1ee7a th\u00e0nh ph\u1ed1 t\u1edbi 60%. &nbsp;<\/li>\n\n\n\n<li>3. D\u1ef1 \u0111o\u00e1n r\u1ee7i ro: Vi\u1ec7c gi\u00e1m s\u00e1t kh\u00ed m\u00ea-tan\/\u0111\u1ed9 nghi\u00eang gi\u00fap ng\u0103n ng\u1eeba c\u00e1c v\u1ee5 n\u1ed5 v\u00e0 tai n\u1ea1n l\u00fan ngay t\u1ea1i ngu\u1ed3n. &nbsp;<\/li>\n<\/ul>\n\n\n\n<p>S\u1ea3n ph\u1ea9m n\u00e0y l\u00e0 c\u1ea5u h\u00ecnh thi\u1ebft y\u1ebfu cho c\u01a1 s\u1edf h\u1ea1 t\u1ea7ng \u0111\u00f4 th\u1ecb (\u0111i\u1ec7n\/kh\u00ed\/vi\u1ec5n th\u00f4ng) v\u00e0 l\u00e0 n\u1ec1n t\u1ea3ng c\u1ee7a an to\u00e0n th\u00e0nh ph\u1ed1 th\u00f4ng minh!<\/p>","protected":false},"excerpt":{"rendered":"<p>I. T\u00ednh n\u0103ng k\u1ef9 thu\u1eadt 1. V\u1eadt li\u1ec7u &amp; Quy tr\u00ecnh - V\u1eadt li\u1ec7u \u0111\u1ebf b\u1eb1ng s\u1eaft d\u1ebbo: - Quy tr\u00ecnh ch\u1ed1ng \u0103n m\u00f2n: 2. C\u1ea5u tr\u00fac an ninh kh\u00f3a l\u00f2 xo 3. Thi\u1ebft k\u1ebf t\u1ed1i \u01b0u h\u00f3a ch\u1ee9c n\u0103ng II. \u01afu \u0111i\u1ec3m c\u1ed1t l\u00f5i 1. An ninh &amp; An to\u00e0n t\u1ed1i \u01b0u 2. \u0110\u1ed9 b\u1ec1n c\u1ef1c cao &amp; Kh\u1ea3 n\u0103ng ch\u1ed1ng l\u00fan 3. Tu\u1ed5i th\u1ecd d\u00e0i &amp; B\u1ea3o tr\u00ec th\u1ea5p 4. Kh\u1ea3 n\u0103ng th\u00edch \u1ee9ng v\u1edbi m\u00f4i tr\u01b0\u1eddng III. C\u00e1c t\u00ecnh hu\u1ed1ng \u1ee9ng d\u1ee5ng &amp; Ph\u00f9 h\u1ee3p t\u1ea3i 1. Khu v\u1ef1c an ninh cao: [\u2026]<\/p>","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,2,8,40],"tags":[75,63,117],"class_list":["post-647","post","type-post","status-publish","format-standard","hentry","category-ductile-cast-iron-products","category-products","category-round-manhole-cover","category-round-manhole-cover-with-snap-ring","tag-ductile-iron","tag-manhole-cover","tag-manhole-cover-with-snap-ring"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Ductile Cast Iron Round Manhole Cover With Snap Ring Round Manhole Cover With Snap Ring - LZBMetal Products Co., Ltd<\/title>\n<meta name=\"description\" content=\"Ductile Iron Spring-Lock Manhole Cover is cast from QT500-7 ductile iron and incorporates a patented spring-lock mechanism (spring-lock system), specifically designed for high-security and high-sealing scenarios. 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