{"id":808,"date":"2010-08-03T01:20:03","date_gmt":"2010-08-02T18:20:03","guid":{"rendered":"https:\/\/lethycorp.com\/?p=808"},"modified":"2023-08-25T11:33:25","modified_gmt":"2023-08-25T04:33:25","slug":"%e9%92%bb%e5%a4%b4","status":"publish","type":"post","link":"https:\/\/lethycorp.com\/cn\/hoi-dap\/khoan-coc-nhoi.html","title":{"rendered":"\u94bb\u5b54\u6869\u94bb\u5b54\u2014\u2014\u94bb\u5b54\u6869\u94bb\u5b54\u673a\u7684\u7c7b\u578b"},"content":{"rendered":"\n
C\u00e1c lo\u1ea1i m\u00e1y khoan c\u1ecdc nh\u1ed3i<\/strong><\/h6>\n\n\n\n

I. M\u00e1y khoan c\u1ecdc nh\u1ed3i tu\u1ea7n ho\u00e0n.<\/p>\n\n\n\n

1. C\u1ea5u t\u1ea1o:
T\u00ednh t\u1eeb \u0111\u00e1y l\u1ed7 khoan c\u1ecdc nh\u1ed3i l\u00ean th\u00ec c\u00e1c b\u1ed9 ph\u1eadn l\u1eafp v\u1edbi nhau theo th\u1ee9 t\u1ef1 sau: M\u0169i khoan c\u1ecdc nh\u1ed3i, qu\u1ea3 chu\u1ef3, c\u00e1c \u0111o\u1ea1n c\u1ea7n khoan c\u00f3 ti\u1ebft di\u1ec7n h\u00ecnh v\u00e0nh kh\u0103n, \u0111o\u1ea1n c\u1ea7n khoan c\u1ecdc nh\u1ed3i c\u00f3 ti\u1ebft di\u1ec7n h\u00ecnh ch\u1eef kh\u1ea9u (1 \u0111o\u1ea1n), kh\u1edbp v\u1ea1n n\u0103ng, \u1ed1ng m\u1ec1m d\u1eabn dung d\u1ecbch bent\u00f4nit, m\u00e1y b\u01a1m(ho\u1eb7c m\u00e1y h\u00fat).<\/p>\n\n\n\n

Kh\u1edbp v\u1ea1n n\u0103ng c\u00f3 l\u1eafp quai m\u00f3c v\u00e0o m\u00f3c c\u1ee7a pal\u0103ng c\u00e1p \u0111\u1ec3 n\u00e2ng h\u1ea1 khi c\u1ea7n thi\u1ebft, m\u1eb7t b\u00edch tr\u00ean c\u1ee7a kh\u1edbp v\u1ea1n n\u0103ng l\u1eafp c\u1ed1 \u0111\u1ecbnh v\u1edbi \u1ed1ng m\u1ec1m, m\u1eb7t b\u00edch d\u01b0\u1edbi c\u1ee7a kh\u1edbp v\u1ea1n n\u0103ng quay c\u00f9ng v\u1edbi \u0111o\u1ea1n c\u1ea7n c\u00f3 ti\u1ebft di\u1ec7n h\u00ecnh ch\u1eef kh\u1ea9u.<\/p>\n\n\n\n

\u0110o\u1ea1n c\u1ea7n c\u00f3 ti\u1ebft di\u1ec7n ch\u1eef kh\u1ea9u d\u00e0i h\u01a1n c\u00e1c \u0111o\u1ea1n c\u1ea7n c\u00f3 ti\u1ebft di\u1ec7n v\u00e0nh kh\u0103n \u0111\u1ec3 d\u1ec5 d\u00e0ng cho vi\u1ec7c l\u1eafp th\u00eam c\u00e1c \u0111o\u1ea1n c\u1ea7n khi t\u0103ng d\u1ea7n \u0111\u1ed9 s\u00e2u.
<\/p>\n\n\n\n

\u0110o\u1ea1n c\u1ea7n c\u00f3 ti\u1ebft di\u1ec7n h\u00ecnh ch\u1eef kh\u1ea9u tr\u01b0\u1ee3t trong m\u00e2m quay c\u00f3 l\u1ed7 h\u00ecnh vu\u00f4ng t\u01b0\u01a1ng \u1ee9ng. Khi m\u00e2m quay \u0111\u01b0\u1ee3c d\u1eabn \u0111\u1ed9ng quay th\u00ec truy\u1ec1n momen cho \u0111o\u1ea1n c\u1ea7n c\u00f3 ti\u1ebft di\u1ec7n ch\u1eef kh\u1ea9u v\u00e0 l\u00e0m cho c\u00e1c b\u1ed9 ph\u1eadn l\u1eafp d\u01b0\u1edbi \u0111o\u1ea1n n\u00e0y (g\u1ed3m c\u00e1c \u0111o\u1ea1n c\u1ea7n khoan c\u00f3 ti\u1ebft di\u1ec7n v\u00e0nh kh\u0103n, qu\u1ea3 ch\u00f9y v\u00e0 m\u0169i khoan) quay theo.<\/p>\n\n\n\n

M\u0169i khoan c\u1ecdc nh\u1ed3i c\u1ee7a lo\u1ea1i m\u00e1y n\u00e0y c\u00f3 hai lo\u1ea1i, khoan \u0111\u1ea5t v\u00e0 khoan \u0111\u00e1. M\u0169i khoan \u0111\u1ea5t c\u00f3 c\u00e1c c\u00e1c h\u00e0ng r\u0103ng c\u1eaft \u0111\u1ec3 c\u1eaft \u0111\u1ea5t. M\u0169i khoan \u0111\u00e1 c\u00f3 nhi\u1ec1u qu\u1ea3 ch\u00f2ng nh\u1ecf c\u00f3 tr\u1ee5c quay tr\u00ean m\u0169i khoan, m\u1ed7i qu\u1ea3 l\u1ea1i c\u00f3 nhi\u1ec1u r\u0103ng nh\u1ecf b\u1eb1ng th\u00e9p ch\u1ecbu va \u0111\u1eadp ch\u1ecbu m\u00e0i m\u00f2n. Khi m\u0169i khoan c\u1ecdc nh\u1ed3i quay th\u00ec c\u00e1c r\u0103ng nh\u1ecf n\u00e0y mi\u1ebft v\u1ee1 \u0111\u00e1 d\u01b0\u1edbi \u0111\u00e1y l\u1ed7 khoan c\u1ecdc nh\u1ed3i.
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Qu\u1ea3 ch\u00f9y c\u00f3 t\u00e1c d\u1ee5ng t\u1ea1o l\u1ef1c \u0111\u00e8 l\u00ean m\u0169i khoan c\u1ecdc nh\u1ed3i.<\/p>\n\n\n\n

2. Ph\u01b0\u01a1ng ph\u00e1p l\u00e0m v\u1ee1 \u0111\u1ea5t \u0111\u00e1 th\u00e0nh phoi (m\u00f9n khoan):
M\u0169i khoan \u0111\u1ea5t th\u00ec d\u00f9ng l\u1ef1c c\u1eaft c\u1ee7a r\u0103ng. Khoan \u0111\u00e1 th\u00ec d\u00f9ng l\u1ef1c mi\u1ebft v\u1ee1, m\u00e0i v\u1ee1 v\u00e0 va \u0111\u1eadp khi m\u0169i khoan quay.<\/p>\n\n\n\n

3. C\u00e1ch l\u1ea5y phoi kh\u1ecfi l\u1ed7 khoan:
Khoan tu\u1ea7n ho\u00e0n thu\u1eadn:
<\/p>\n\n\n\n

M\u00e1y b\u01a1m h\u00fat dung d\u1ecbch t\u1eeb b\u1ec3 ch\u1ee9a b\u01a1m v\u00e0o l\u1ed7 khoan theo chi\u1ec1u sau: M\u00e1y b\u01a1m –> \u1ed0ng d\u1eabn m\u1ec1m –> Kh\u1edbp v\u1ea1n n\u0103ng –> C\u00e1c \u0111o\u1ea1n c\u1ea7n khoan –> Xuy\u00ean qua qu\u1ea3 ch\u00f9y –> Xuy\u00ean qua m\u0169i khoan. D\u00f2ng dung d\u1ecbch x\u00f3i \u0111\u00e1y l\u1ed7 khoan r\u1ed3i d\u1eabn phoi l\u00ean theo kho\u1ea3ng v\u00e0nh kh\u0103n gi\u1eefa c\u1ea7n khoan v\u00e0 th\u00e0nh l\u1ed7 khoan, sau khi d\u00f2ng dung d\u1ecbch l\u00ean kh\u1ecfi l\u1ed7 khoan th\u00ec \u0111\u01b0\u1ee3c d\u1eabn v\u00e0o b\u1ec3 l\u1eafng phoi, r\u1ed3i ch\u1ea3y qua b\u1ec3 ch\u1ee9a phoi. T\u1eeb b\u1ec3 ch\u1ee9a, dung d\u1ecbch l\u1ea1i \u0111\u01b0\u1ee3c m\u00e1y b\u01a1m b\u01a1m xu\u1ed1ng \u0111\u00e1y l\u1ed7 khoan.
<\/p>\n\n\n\n

Dung d\u1ecbch c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang l\u1edbn th\u00ec phoi s\u1ebd d\u1ec5 \u0111\u01b0\u1ee3c d\u1eabn l\u00ean h\u01a1n so v\u1edbi dung d\u1ecbch c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang nh\u1ecf.
Tr\u01b0\u1eddng h\u1ee3p \u0111\u01b0\u1eddng k\u00ednh l\u1ed7 khoan l\u1edbn th\u00ec v\u1eadn t\u1ed1c d\u00f2ng dung d\u1ecbch t\u1eeb \u0111\u00e1y l\u1ed7 khoan l\u00ean \u0111\u1ebfn mi\u1ec7ng l\u1ed7 khoan r\u1ea5t ch\u1eadm, c\u00e1c phoi khoan l\u1ea1i c\u00f3 xu h\u01b0\u1edbng ch\u00ecm xu\u1ed1ng l\u1ea1i \u0111\u00e1y l\u1ed7 khoan. Nh\u01b0 v\u1eady t\u1ed1c \u0111\u1ed9 khoan s\u1ebd ch\u1eadm.
<\/p>\n\n\n\n

Khoan tu\u1ea7n ho\u00e0n ngh\u1ecbch:
Khoan tu\u1ea7n ho\u00e0n thu\u1eadn c\u00f3 nh\u01b0\u1ee3c \u0111i\u1ec3m nh\u01b0 n\u00eau tr\u00ean, tr\u01b0\u1eddng h\u1ee3p \u0111\u01b0\u1eddng k\u00ednh l\u1edbn th\u01b0\u1eddng khoan tu\u1ea7n ho\u00e0n ngh\u1ecbch.
M\u00e1y h\u00fat h\u00fat phoi t\u1eeb \u0111\u00e1y l\u1ed7 khoan l\u00ean, phoi \u0111\u01b0\u1ee3c h\u00fat c\u00f9ng v\u1edbi dung d\u1ecbch theo chi\u1ec1u sau: M\u0169i khoan –> Qu\u1ea3 ch\u00f9y –> C\u00e1c \u0111o\u1ea1n c\u1ea7n khoan –> <\/p>\n\n\n\n

Kh\u1edbp v\u1ea1n n\u0103ng –> \u1ed0ng d\u1eabn m\u1ec1m –> Qua m\u00e1y h\u00fat –> X\u1ea3 v\u00e0o b\u1ec3 l\u1eafng phoi. T\u1eeb b\u1ec3 l\u1eafng, dung d\u1ecbch l\u1ea1i ch\u1ea3y v\u00e0o l\u1ed7 khoan.
Nh\u01b0 v\u1eady c\u00e1c phoi khoan \u0111i qua m\u00e1y h\u00fat. C\u00e1c c\u00e1nh b\u01a1m c\u1ee7a m\u00e1y h\u00fat c\u00f3 c\u1ea5u t\u1ea1o \u0111\u1eb7c bi\u1ec7t \u0111\u1ec3 c\u00f3 th\u1ec3 d\u1eabn phoi qua. C\u00f9ng m\u1ed9t m\u00e1y khoan tu\u1ea7n ho\u00e0n th\u00ec c\u00f4ng su\u1ea5t m\u00e1y h\u00fat phoi l\u1edbn g\u1ea5p 2 \u0111\u1ebfn 3 l\u1ea7n c\u00f4ng su\u1ea5t c\u1ee7a m\u00e1y b\u01a1m dung d\u1ecbch.<\/p>\n\n\n\n

4. C\u00e1ch t\u0103ng d\u1ea7n \u0111\u1ed9 s\u00e2u khoan:
Phoi khoan \u0111\u01b0\u1ee3c d\u1eabn l\u00ean th\u00ec c\u00e1c b\u1ed9 ph\u1eadn tr\u01b0\u1ee3t d\u1ea7n xu\u1ed1ng, \u0111o\u1ea1n c\u1ea7n c\u00f3 ti\u1ebft di\u1ec7n ch\u1eef kh\u1ea9u c\u0169ng tr\u01b0\u1ee3t xu\u1ed1ng cho \u0111\u1ebfn khi m\u1eb7t b\u00edch tr\u00ean c\u1ee7a \u0111o\u1ea1n c\u1ea7n n\u00e0y s\u1eafp ch\u1ea1m m\u00e2m quay th\u00ec ph\u1ea3i ti\u1ebfn h\u00e0nh l\u1eafp th\u00eam \u0111o\u1ea1n c\u1ea7n khoan c\u00f3 ti\u1ebft di\u1ec7n v\u00e0nh kh\u0103n \u0111\u1ec3 ti\u1ebfp t\u1ee5c khoan s\u00e2u th\u00eam.
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V\u1ec1 c\u1ea5u t\u1ea1o, c\u00e1c m\u1eb7t b\u00edch c\u1ee7a c\u00e1c \u0111o\u1ea1n c\u1ea7n khoan l\u1eafp v\u1edbi nhau b\u1eb1ng m\u1ed1i gh\u00e9p bul\u00f4ng, truy\u1ec1n momen nh\u1edd acg\u00f4, c\u00e1c m\u1ed1i gh\u00e9p n\u00e0y c\u00f3 roan cao su \u0111\u1ec3 ch\u1ed1ng r\u00f2 r\u1ec9 dung d\u1ecbch khoan.<\/p>\n\n\n\n

M\u00e2m quay c\u00f3 4 b\u00f9 t\u00e2m (2 b\u00f9 t\u00e2m l\u1edbn, 2 b\u00f9 t\u00e2m nh\u1ecf), khi l\u1eafp 4 b\u00f9 t\u00e2m n\u00e0y v\u00e0o m\u00e2m quay th\u00ec t\u1ea1o th\u00e0nh l\u1ed7 h\u00ecnh vu\u00f4ng \u00f4m kh\u00edt v\u00e0o c\u1ea7n c\u00f3 ti\u1ebft di\u1ec7n ch\u1eef kh\u1ea9u \u0111\u1ec3 truy\u1ec1n momen, khi t\u00e1o 4 b\u00f9 t\u00e2m ra th\u00ec t\u1ea1o th\u00e0nh l\u1ed7 r\u1ed9ng gi\u1eefa m\u00e2m quay v\u00e0 c\u00f3 th\u1ec3 k\u00e9o m\u1eb7t b\u00edch t\u1eeb d\u01b0\u1edbi m\u00e2m quay (d\u01b0\u1edbi b\u1ec7 m\u00e1y) l\u00ean tr\u00ean m\u00e2m quay (tr\u00ean b\u1ec7 m\u00e1y).<\/p>\n\n\n\n

C\u00e1c b\u01b0\u1edbc ti\u1ebfn h\u00e0nh nh\u01b0 sau:
B1: Th\u00e1o 4 b\u00f9 t\u00e2m kh\u1ecfi m\u00e2m quay, t\u1ea1o th\u00e0nh l\u1ed7 r\u1ed9ng gi\u1eefa m\u00e2m quay.
B2: D\u00f9ng pal\u0103ng k\u00e9o kh\u1edbp v\u1ea1n n\u0103ng \u0111\u1ec3 n\u00e2ng c\u1ea7n khoan v\u00e0 c\u00e1c b\u1ed9 ph\u1eadn l\u1eafp b\u00ean d\u01b0\u1edbi l\u00ean cho \u0111\u1ebfn khi m\u1eb7t b\u00edch tr\u00ean (m\u1eb7t b\u00edch A) c\u1ee7a \u0111o\u1ea1n c\u1ea7n c\u00f3 ti\u1ebft di\u1ec7n v\u00e0nh kh\u0103n tr\u00ean c\u00f9ng l\u00ean tr\u00ean m\u00e2m quay.
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B3. L\u1eafp l\u1ea1i 2 b\u00f9 t\u00e2m l\u1edbn cho l\u1ed7 gi\u1eefa m\u00e2m quay nh\u1ecf l\u1ea1i, d\u00f9ng b\u00e0n ch\u00eam \u0111\u1ec3 gi\u1eef m\u1eb7t b\u00edch A tr\u00ean m\u00e2m quay. (Ch\u1ed5 l\u1eafp th\u00eam l\u00fac n\u00e0y n\u1eb1m tr\u00ean m\u00e2m quay).
B4. Th\u00e1o m\u1ed1i gh\u00e9p \u1edf m\u1eb7t b\u00edch A, \u0111o\u1ea1n c\u00f3 ti\u1ebft di\u1ec7n ch\u1eef kh\u1ea9u \u0111\u01b0\u1ee3c th\u00e1o kh\u1ecfi \u0111o\u1ea1n c\u00f3 ti\u1ebft di\u1ec7n v\u00e0nh kh\u0103n.
B5. L\u1eafp th\u00eam \u0111o\u1ea1n c\u1ea7n m\u1edbi l\u00ean tr\u00ean m\u1eb7t b\u00edch A. M\u1eb7t b\u00edch tr\u00ean c\u1ee7a \u0111o\u1ea1n m\u1edbi l\u1eafp v\u00e0o n\u00e0y l\u00e0 m\u1eb7t b\u00edch B.
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B6. L\u1ea1i th\u00e1o 2 b\u00f9 t\u00e2m l\u1edbn \u0111\u1ec3 th\u1ea3 \u0111o\u1ea1n c\u1ea7n v\u1eeba l\u1eafp v\u00e0o xu\u1ed1ng, l\u1ea1i l\u1eafp 2 b\u00f9 t\u00e2m l\u1edbn r\u1ed3i d\u00f9ng b\u00e0n ch\u00eam \u0111\u1ec3 gi\u1eef m\u1eb7t b\u00edch B tr\u00ean m\u00e2m quay.
B7. L\u1eafp l\u1ea1i \u0111o\u1ea1n c\u1ea7n c\u00f3 ti\u1ebft di\u1ec7n ch\u1eef kh\u1ea9u v\u00e0o m\u1eb7t b\u00edch B.
B8. Th\u00e1o 2 b\u00f9 t\u00e2m l\u1edbn \u0111\u1ec3 th\u1ea3 m\u1eb7t b\u00edch B xu\u1ed1ng d\u01b0\u1edbi m\u00e2m quay.
<\/p>\n\n\n\n

B9. L\u1eafp l\u1ea1i 4 b\u00f9 t\u00e2m.
Vi\u1ec7c th\u00e1o l\u1eafp c\u00e1c \u0111o\u1ea1n c\u1ea7n ph\u1ea3i \u0111\u1ea3m b\u1ea3o ch\u1ed1ng r\u00f2 r\u1ec9 dung d\u1ecbch qua m\u1ed1i gh\u00e9p v\u00e0 kh\u00e1 m\u1ea5t th\u00ec gi\u1edd, v\u00ec v\u1eady m\u0169i khoan \u0111\u00e1 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c l\u1eafp ngay t\u1eeb \u0111\u1ea7u m\u00e0 kh\u00f4ng d\u00f9ng m\u0169i khoan \u0111\u1ea5t.<\/p>\n\n\n\n

M\u00e1y khoan tu\u1ea7n ho\u00e0n th\u00f4ng d\u1ee5ng hi\u1ec7n nay c\u00f3 c\u00e1c ki\u1ec3u GPS 15, GPS 22 c\u1ee7a Trung Qu\u1ed1c, YP\u0411-3AM-500 l\u1eafp tr\u00ean m\u00e1y c\u01a1 s\u1edf l\u00e0 \u00f4t\u00f4 Maz c\u1ee7a Nga….<\/p>\n\n\n\n

II. M\u00e1y khoan c\u1ecdc nh\u1ed3i, xo\u1eafn ru\u1ed9t g\u00e0!<\/p>\n\n\n\n

– T\u1ea1o l\u1ed7 c\u1ecdc b\u1eb1ng thi\u1ebft b\u1ecb khoan gu\u1ed3ng xo\u1eafn v\u00e0 h\u1ec7 gu\u1ed3ng xo\u1eafn (t\u1ea1o c\u1ecdc khoan nh\u1ed3i, t\u01b0\u1eddng v\u00e2y Diaphragm wall)
– T\u1ea1o l\u1ed7 c\u1ecdc b\u1eb1ng thi\u1ebft b\u1ecb khoan th\u00f9ng \u0111\u00e0o (t\u1ea1o c\u1ecdc khoan nh\u1ed3i)
– T\u1ea1o l\u1ed7 c\u1ecdc b\u1eb1ng thi\u1ebft b\u1ecb \u0111\u00e0o g\u1ea7u tr\u00f2n (t\u1ea1o c\u1ecdc nh\u1ed3i tr\u00f2n)
<\/p>\n\n\n\n

– T\u1ea1o l\u1ed7 b\u1eb1ng thi\u1ebft b\u1ecb \u0111\u00e0o g\u1ea7u d\u1eb9t c\u01a1 c\u1ea5u th\u1ee7y l\u1ef1c (t\u1ea1o c\u1ecdc Barrette, t\u01b0\u1eddng v\u00e2y[1] Diaphragm wall)
– T\u1ea1o l\u1ed7 b\u1eb1ng m\u00e1y khoan c\u1ecdc nh\u1ed3i ki\u1ec3u b\u01a1m ph\u1ea3n tu\u1ea7n ho\u00e0n
– T\u1ea1o l\u1ed7 b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p s\u00f3i n\u01b0\u1edbc b\u01a1m ph\u1ea3n tu\u1ea7n ho\u00e0n
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– T\u1ea1o l\u1ed7 c\u1ecdc b\u1eb1ng c\u00e1ch \u0111\u00e0o th\u1ee7 c\u00f4ng
* C\u00f3 th\u1ec3 k\u1ec3 ra \u0111\u00e2y c\u00e1c b\u01b0\u1edbc ph\u00e1t tri\u1ec3n sau:
– C\u1ecdc khoan nh\u1ed3i ; l\u00e0 c\u1ecdc m\u00e0 l\u1ed7 c\u1ecdc \u0111\u01b0\u1ee3c thi c\u00f4ng b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p khoan kh\u00e1c nhau nh\u01b0 khoan g\u1ea7u, khoan r\u1eeda ng\u01b0\u1ee3c..
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– C\u1ecdc khoan nh\u1ed3i m\u1edf r\u1ed9ng \u0111\u00e1y: l\u00e0 c\u1ecdc khoan nh\u1ed3i c\u00f3 \u0111\u01b0\u1eddng k\u00ednh \u0111\u00e1y c\u1ecdc \u0111\u01b0\u1ee3c m\u1edf r\u1ed9ng l\u1edbn h\u01a1n \u0111\u01b0\u1eddng k\u00ednh th\u00e2n c\u1ecdc. S\u1ee9c mang t\u1ea3i c\u1ee7a c\u1ecdc n\u00e0y s\u1ebd t\u0103ng l\u00ean ch\u1eebng 5- 10% do t\u0103ng s\u1ee9c mang t\u1ea3i d\u01b0\u1edbi m\u0169i
– C\u1ecdc barrette: l\u00e0 c\u1ecdc nh\u1ed3i nh\u01b0ng c\u00f3 ti\u1ebft di\u1ec7n kh\u00f4ng tr\u00f2n v\u1edbi c\u00e1c ti\u1ebft di\u1ec7n kh\u00e1c nhau nh\u01b0 ch\u1eef nh\u1eadt, ch\u1eef th\u1eadp, ch\u1eef I, ch\u1eef H…v\u00e0 \u0111\u01b0\u1ee3c t\u1ea1o l\u1ed7 b\u1eb1ng g\u1ea7u ngo\u1ea1m. S\u1ee9c mang t\u1ea3i c\u1ee7a c\u1ecdc n\u00e0y c\u00f3 th\u1ec3 t\u0103ng l\u00ean t\u1edbi 30% do t\u0103ng s\u1ee9c mang t\u1ea3i b\u00ean.
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– C\u1ecdc khoan nh\u1ed3i c\u00f3 x\u00f3i r\u1eeda v\u00e0 b\u01a1m v\u1eefa xi m\u0103ng gia c\u01b0\u1eddng \u0111\u00e1y (CNRB\u0110): l\u00e0 c\u1ecdc khoan nh\u1ed3i c\u00f3 \u00e1p d\u1ee5ng c\u00f4ng ngh\u1ec7 r\u1eeda s\u1ea1ch \u0111\u00e1y ( b\u1eb1ng c\u00e1ch x\u00f3i \u00e1p l\u1ef1c cao) v\u00e0 b\u01a1m v\u1eefa xi m\u0103ng gia c\u01b0\u1eddng \u0111\u00e1y (c\u00f9ng v\u1edbi \u00e1p l\u1ef1c cao). \u0110\u00e2y l\u00e0 b\u01b0\u1edbc ph\u00e1t tri\u1ec3n g\u1ea7n \u0111\u00e2y nh\u1ea5t trong c\u00f4ng ngh\u1ec7 thi c\u00f4ng c\u1ecdc nh\u1ed3i nh\u1eb1m l\u00e0m t\u0103ng \u0111\u1ed9t bi\u1ebfn s\u1ee9c mang t\u1ea3i c\u1ee7a c\u1ecdc nh\u1ed3i (c\u00f3 th\u1ec3 t\u1edbi 200 – 300%), cho ph\u00e9p s\u1eed d\u1ee5ng t\u1ed1i \u0111a \u0111\u1ed9 b\u1ec1n c\u1ee7a b\u00ea t\u00f4ng c\u1ecdc.<\/p>\n\n\n\n

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Th\u00f4ng tin li\u00ean h\u1ec7:<\/strong><\/p>\n\n\n\n

Th\u00f4ng tin li\u00ean h\u1ec7:<\/strong><\/p>\n\n\n\n