KHOA HQC - CQNG NGHE aaaaa
DANH GIA KHA NANG ONG DUNG COC ONG v\t?
TRONG THIET K^ CAC C O N G T R I N H NGAN SONG DANG DAP TRU D O
ThS. PHAM TI^N KY Vign Khoa hpc Thuy Igi Viet Nam
Tdm tit: ^ Trong qud trinh nghidn ciru vd dp dgng cdc cdng trinh ngdn sdng vung tridu, vide lga chon lo^icgc xir ly nen
Id mdt bdi todn rit phirc t^p di ddp img ydu ciu kinh te ky thudt Ddc bidt Id cdng tdc xir ly ndn cho cdng trinh ngdn sdng l&n d^ng d$p Tru da khu vuc ddng bang sdng Cuu Long hay cdc cdng trinh chdng ngdp iing theo Quyit dinh s6 1547/QD-TTg ngdy 28/10/2008 thudc khu vgc TP Hi Chi Minh. Trong khudn kho bdi bdo ndy, cdc tdc gia ch! tdp trung phdn tich mdt sd uu nhugc diim cda cdc lo^i coc thdng dung va kha ndng img dijng cua CQC Sng thdp trong thiet ke cac cdng trinh ngdn sdng ndi trdn.
Sumary:
In the process of researching and applying tidal damming projects, the selection of pile to tackle foundations
; is a very complex problem to satisfy the technical and economic requirements. Especially for the ground i treatment works to prevent large river with Tru Do dams in Mekong Delta or the anti-Hooding works by I Decision dated 28/10/2008 1547/QD-TTg sector TP. Ho Chi Minh City. In the this article, the author focuses gn some of the advantages and disadvantages of the common types of pile and the possibility of application of steel pipe piles in the design of the damming project above.
1 . GIAI thfeu Chung:
C i c c i n g trinh ngin sdng Idn viing trieu thuOc Dong bing sdng CLPU Long thudng cd dja c h i t phirc tgp, ehilu d i y Idp d i t y l u r i t Idn. Cao trinh day ldp dat y l u (Olt bun long, dat set pha trgng t h i i chay, cd chi s l SPT N30 < 10) nam trong khoang tir (-25 -s- -30)m.
V i Idp d i t c i t hgt nhd d i n hgt tmng d trgng thai chat vira dugc phan b l d r i t sau n i m trong khoang cao trinh (-40 * -50)m trd xuong. Oong thdi ehilu sau cCia d i y sdng tgi c i c eCra sdng Idn thudng cd chilu sau tir (15 + 20)m. Dao dOng cua myc nudc trilu khoang tip (2,5 + 3)m. Do dd. d c cdng trinh ngan song viing trieu thudng t i i trpng ngang Idn. Y i u d u phai co giai phap x u ly n i n t i n g kha nang khing ngang cho cong trinh.
Khi di v i o thilt k l d e cdng trinh ching ngap ung TP.
H i Chf Minh thuOc Quyet djnh s l 1547/QO-TTg ngay 28/10/2008. C i c do i n thudng su" dgng eac cpc thdng dgng nhu:
- CQC chdn dp: CQC vudng BTCT (du img lyc); cpc I n g ly t i m b i tdng irng lye toi'dc;
- CQC thay thd: CQC khoang nhli.
Cpc c h i n i p : Y i u d u chilu d i i L > 40m thi logi cpc lya
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chpn la cpc ly tam be tong Cpng lyc trudc. Vdi c i e logi cpc nay chieu dai moi dot cpc cd the dgt den L = 40m va dudng kinh thong dgng tir (300 ^ 1200)mm. Logi cpc nay c6 the dong xien den dO xien 1:4 vdi dudng kinh cpc len den DBOOmm. Tuy nhien khi thi cdng vdi chieu dai Idn thi thudng xay ra cac bat on trong thi cong nhu:
Bj nipt thin, vd d i u cpc, nirt cpc khi lap dyng... Va khi dong cpc g i y ra chan dOng Idn anh hudng den cac cdng trinh xung quanh, khd dam bao dieu kiin theo
"Quy trinh dong cpc trong vung xay chen". Vi vay, logi cpc nay r i t kho ap dgng cho cac cdng trinh ngan song trong khu vyc TP. Ho Chi Minh.
Coc thay the: Thong dung nhat i i cpc khoan nhoi, la logi cpc CO the thi cOng dugc vdi chieu dai Idn. r i t phii hgp vdi cac cong trinh cd tai trpng ldn. Cpc d the thi cdng vdi dja chat cong trinh phtpc tap. khong gay anh hudng dang k l den cong trinh xung quanh. Tuy nhien.
vdi dgc diem dja chat khu vyc thi chieu dai cpc khoan nhoi n i m trong khoang tii" (50 ^ 60)m. Cpc dam bao chuyin vj d i u cpc Ay < 1,0cm vdi Idp d i t y l u phin t r i n Idn, l i m cho kha nang khing dirng d a no Idn han r i t nhilu so vdi kha nang khang ngang. Qua k i t qua tinh t o i n mOt so eong theo Quyet djnh so 1547/QO-TTg
aaaaa KHOA HQC - CQNG NGHE
ngiy 28/10/2008 nhu: Cing Kinh LO, C i n g Kinh Hing.
Cing Phu Xuin. C i n g T i n Thuin. Cing Song Kinh...
v i Cing Nhiiu LOc - Thj Nghe, ty 1$ k h i ning khing di>ng v i khing ngang: P ^ g , ^ , ^ G (1/25 + 1/30). Nhu viy, dilu kiin l i m vigc cua cdng trinh cd t i i trpng ngang Idn thi s l lugng cpc khoan nhoi thudng lya chpn theo dilu kiin t i i trpng ngang. LOc dd k h i ning chju lyc di>ng eua h i cpc se du r i t nhilu, g i y ra ling phi.
D i n g thdi. vdi dilu kign thi cdng dudi nudc. chju i n h hudng eiia thuy trilu. Ing v i c h sir dgng phii cd chilu d i i tir (30 + 35)m Idn d l d t h i d m h i t Idp d i t biin Idng hay s i t hO-u ca d i y tir (25 + 30)m. Tuy nhien Ing v i c h n i y thudng bj m i t trong d i t khoing (20 + 25)m d Idp d i t biin ling. VI vgy. g i i thinh cpc khoan nhli dudi nudc trong khu vyc nghiin ciru tang l i n r i t cao.
B i n cgnh dd. cpc I n g thip l i logi cpc dugc irng dgng d nhilu nude trin t h i gidi tir nh&ng n i m 1920 v i dugc chu y i p dgng nhilu trong nhCrng n i m ehiln tranh t h i gidi thip II d d c edng trinh d n g d a Nhit B i n . Bude v i o nh&ng thip niin 60, cpc I n g thip duge i p dgng nhilu cho d c cdng trinh Idn nhu d u t i u Yamashita d d n g Yokohama v i d u t i u M i y d d n g Kobe. Vdi sy phit triln nhanh ciia nginh cdng nghiip thip Nhit Bin, v i t liiu c h l tgo cpc I n g t h i p cd dO b i n ngiy eing cao, d i p irng d c y i u d u v l tuii thp khai thic l i n d i n 100 n i m . Oiln hinh nhu s i n bay Haneda n i m d Khu Ota thu dd Tokyo, d u Tokyo Gate dugc x i y dyng trong nhO-ng n i m 2002.
Ngoii viic nghiin ciru v l v i t l i i u c h l tgo thi biin phip b i o v i ching i n mdn cOng dugc chu trpng. Tir nh&ng n i m 1950 trd v l trudc khii niim v l b i o v f i n m i n l i 'cho phdp dn mdn', theo d6 ehilu d i y cpc I n g thip p h l i ting l i n d l dy triJ eho sy m i t m i t cua i n mdn g i y ra. O i n nh&ng n i m 1950 + 1980 dua ra v i i p dgng d c phuang phip ching i n mdn nhu: B i o vg ea-tit, b i o v i bing Idp phu/san phii. Sau nh&ng n i m 1980 ly thuylt "cho phip i n mdn' bj xda bd v i t u nhung n i m 2000 + nay biin phip bao v i ching i n mdn dugc dua ra Trong tuii thp khai thic thilt k l , khOng eho thip bj i n mdn'.
T& nh&ng n i m 2000 d i n nay, cpc ong thip san xult theo d n g nghi h i n xoln, d n g n g h i ching an mOn cua Nhit B i n dugc ung dgng nhilu d Viit Nam trong d c cdng trinh: C l u giao thdng, b i n d n g Idn... VI cpc I n g thip d nhung uu d i l m n i i b i t nhu sau:
- OO b i n d a v i t liiu c h l tgo theo d n g nghg Nhit B i n k h i cao, cdng n g h i b i o vg chong i n mdn ngiy
d n g phit triln. t u i i thp khai t h i c cpc I n g t h i p ngiy d n g cao;
- De ding khong c h l chat lugng cpc trudc Wii h^
cpc, thdi gian thi cdng nhanh;
- Kha ning chju lyc k ^ , cd k h i n i n g d m xuing ting d i t chju lyc n i m sau;
- K h i nang ddng x i i n Idn, t i n g kha ning chju'tfli ngang cho cdng trinh.
Tuy viy, hiin nay b g i cpc n i y vSn cdn r i t mdi bong v i i c i p dgng d l xir ly n i n cho d c cdng trinh thOy \Q\
ndi ehung v i cdng trinh ngan sdng vung trilu ndi riing.
Vdi nh&ng y i u d u thyc t l trong cdng t i c XOP ly n i n cho cdng trinh ngan sdng dgng d i p Tn,i dd thi viic su dgng mdng cpc I n g t h i p cung l i mOt giii p h i i d n dugc nghien c&u v i t h i o luin.
2. Cdc cdng trinh im dung coc tfng thdp tai Vlfil
NamT u nh&ng nam 2000 d i n nay, cpc I n g thip dS d l i ^ dua v i o Viit Nam v i i p dgng trong c i c cdng trinh d u giao thing Idn, d u d n g Idn. H l u h i t d c cdh^ trihh n i y d i u d sy ho trg v l mgt ky thuit. v i t tu v i nguin v i n cua Nhit Ban. Tiiu bilu d c cdng trinh:
1. C i n g Quoc t l C i i Mep:
L i d n g nudc s i u k5rn d B i Rja - VQng T i u trin sing Cai Mip. Thdng s l cpc I n g t h i p thing d&ng v i ding xiin s& dgng nhu sau:
- V i t liiu: SKK490 - n h i p t& Nhit Ban - Kich thudc:
• 08OO;09OOmm d i y 12mm v i L = 55m
• 01000mm d i y 12mm v i L = 53m
Hinh 1: CQC ing thip tai Cdng Oil Mdp
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KHOA HQC - C Q N G NGHE aaaat
2. C ^ g Container Gemalink:
L i d n g nudc s i u kSm d B i Rja - VQng T i u , sir dgng cpc I n g t h i p cd thdng s l :
- V i t liiu: S355JOH - N h i t Ban; Nai gia cdng c h l tgo cpc: V i i t Nam
- Kich thudc: 0812.8mm d i y 16mm va L = 55m 3. Cing Dung QuM:
L i d n g x u l t s i n p h i m cho n h i m i y Ipc d i u Dung Quit - Quing N g i i , s u dgng cpc I n g thep cd thdng s l :
- V i t liiu: SKK 490 - Nhgp t u Indonesia - Thinh p h i n g i m : 6.240m cpc thing dung v i 15.660m cpc x i i n 1:4.
- Kich thudc:
• 0600mm d i y 9.6mm v i L = (42 +55)m.
- Thi cdng ddng: Biia Diezen
Hinh 2: C:QC ing thip t^i Cing xuit sin phim - Nha may IQC diu Dung Quit
4. Cdng sen Dirang - Rirmosa
L i d n g nudc s i u thuOc khu kinh t l Vung Ang - Ha TTnh. S u dgng d cpc I n g t h i p v i cpc I n g v i n thep d thdng s l :
- V i t liiu cpc I n g t h i p : SKK490-MOD - V i t liiu cpc v i n I n g t h i p : SKY490-MOD - Kich thudc: 0900mm d i y 19mm v i L=(20+ 26)m;
01000mm d i y 14mm v i L=23m.
- Thi d n g ddng: Bua Diezen
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5. Cau Binh-Hdi Phdng
L i d u b l e qua song C i m n i i TP. Hai Phdng va Quang Ninh. Mdng cpc tn,i d u l i ming cpc ong thep nhoi be tdng. O i c trung cpc I n g t h i p nhu sau:
- V i t ligu: SKK400 - Nhgp khiu t u Indonesia - Nai gia d n g : Indonesia
- Kich thudc: 0800mm d i y 12,7m; L = (38 + 39)m.
- Thi cdng ddng: Biia trpng lyc
6. Cau Thanh Tri-Hd Noi
Cpc chl dugc sir dgng l i m vdng v i y thi edng, thdng s l cpc nhu sau:
- V i t ligu: SKY400 - Nhip t u Nhgt Ban; Nai gia cdng: Vigt Nam; Tai n i l : P - P
- Kich thudc: 01200mm d i y 14mm; L = 28m.
- Thi edng ddng: Bua rung TOMEC 160KW - Nhgt B i n
7. Cau Nhdt Tdn-HdNdi
c l u Nhit Tan l i cdng trinh d i u t i i n d Vigt Nam su dgng cflng nghg ming cpc I n g t h i p dgng gilng (SPSP) ciia Nhit B i n . Cpc I n g t h i p SCP dgng d thdng s l :
- V i t ligu: SKY400 va SKY490 - Nhgp t u Nhit Ban - Dgng tai n i i : P - P
- Nai gia cong: Vigt Nam - Kich thude:
• 0 1200mm d i y (16+21)mm; L = (45 +50)m - K l ea p h i n gilng tgm
- Thi cong: Bua rung TOMEC 160KW, x6i nude v i
ar^'T
Hinh 3: Mong coc SPSP-du Nh$t Tin
Maaa KHOA HQC - CQNG NGHE
3. Khd nang im dung coc ong thdp trong thiet lie
ddp trudd
a. Tinh k h i di^ng cua mdng coc ong thep dang g i l n g :
Ming cpc Ing thep dgng gieng (SPSP) d ten tilng Anh "Well - Shaped steel pipe foundation" la mOt logi mdng cpc rat mdi d nudc ta, bao gom nhilu logi khac nhau, trong d i logi mong SPSP da dugc nghiin cuu ap dgng l i logi ming SPSP k i t hgp lam ving v i y thi cdng.
Cpc Ing thep su dgng cho logi mdng nay dugc gpi l i cpc v i n I n g thip - "Steelpipe sheetpile".
Qua tim hilu, nghien cuu k i t d u logi mong cpc niy, nhim t i c g i i nhin thiy: Kha ning chju tai md men u l n v i lye dung cua ming SPSP r i t eao, nhung k h i ning khing ngang ciia logi mdng n i y cdn hgn c h l so vdi quy md cua n6. D i l n hinh l i k i t qua tinh t o i n ciia trg thap P12 d u Nhit T i n nhu Bing 1.
C i n eu v i o Biing 1 cho thiy:
+ Gdc xoay cua d i u cpc <|)» 0, eho thiy lye dung v i md men uon d d i y ming khong anh hudng d i n chuyin vj ngang cua d i u cpc.
+ Vdi g i i tq t i i trpng ngang H^ = 12565 kN » 1280 t i n m i ehuyin vj ngang d i u cpc dgt A = 0,79em ung vdi dilu kign khu vyc x i y dyng d u Nhgt T i n . V i y khi xet vdi dilu kign dja chit d khu vyc TP. Ho Chi Minh cd Idp d i t y l u trin b l mgt d i y thi chuyin vj ngang A se Idn han vdi cung quy mo kich thude eua ming SPSP ndi tren.
+ Quy md ming cpc SPSP sir dgng: Ming cpc sip dgng cho thip tn.J P12 - C l u Nhit T i n theo k i t qua tinh toin d B i n g I la 128 cpc.
Bing 1. Kdt qud tinh m6ng trg P12 • clu Nh$t Tan Hgng mgc
Kich thudc ming SPSP Cpc ong thip (5=20mm) V i t liiu cpc Chilu d i i d m xuing d i t Ngogi lye TTGH Cudng dO 1 tgi d i y ming Vo
Ho
M„
Chuyin vj ngang: A Gdc xoay: i^
P™, ' ^ " O"! cdc P „ J i n 0 1 e p c [P] d a 01 cpc (ca bin) Ty l i P„../[P]
Gia trj 48,7x16.9 D1200 SKY490 27.67 371356 12565 1167251 0.791 0,000 3600 3439 5757 62.5%
Dan vj m mm
m kN kN kN.m em Rad kN/epc kN/cpc kN/cpc
Can cir v i o k i t qua tinh t o i n thilt k l mOt s l d n g trinh ching nggp ung theo Quylt djnh s l 1547/QD-TTg ngiy 28/10/2008 thi tai trpng ngang nhu sau: dng Phi Xuin: 700 tdn;c6ng Tdn Thudn: 630 tin; cdng Kinh L^
1175 tan; cdng sdng Kinh: 950 tdn; cdng Muong Chuk 2200 tan;... Vdi dja chit khu vyc thi quy md kich thu6c tren mat bing eua m i n g SPSP n l u i p dgng cho cSc edng trinh tren se b i n g hogc Idn han kich thudc ming SPSP nhu Bang 1. d l dam bao ehuyin vj d i u cpcA<
[A] =1,0 cm. Khi dd s l lugng cpc I n g t h i p su dgng cho moi tn,! pin d n g se g i n vdi con s l 128 cpc/tn,i v i (I$c bigt vdi nh&ng d n g s i u nhu c i n g Muang Chuli thi quy mo mdng SPSP se phii Idn han. Oilu niy chirng td ming cpc SPSP cd ty lg sue chju tai P^g^JPQi,„^ cQng r i t nhd. v i ehua hgp ly ve kinh t l .
Tuy ring, logi ming cpc SPSP k i t hgp l i m vdng viy thi cdng cd uu d i l m : OO tin d y cao. dO an toin cao trong thi d n g , thdi gian thi d n g nhanh vi k i t hgp dugc lim vong v i y thi cdng. Nhung vdi dilu kign thi cing cpc v i n I n g thip y i u d u r i t cao, vi trong q u i trinh thi cing . se sinh ra ung suit du d l Igi eho k i t d u ming lim
vigc sau niy. Y i u d u ve xe may v i thilt bj sir dgng d tinh chuyen dgng cho cpc I n g thip nhu: Cic logi bua dong cpc; y i u d u ve trpng tai s i lan. miy clu;
may d t cpc dudi nudc chuyin dgng;... Ngoii ra. cpc I n g thep su dgng thudng cd dudng kinh Idn (800 + 1.200mm). tuy nhien trong djnh mire hao phi k9 thuit hign hinh d nudc ta (Dinh muc 1776/BXD-VP ngiy 16/08/2007) mdi ed phan ddng c i c k i t d u eu d me (Cir Lassen; cir BTCT du img lgc...), cpc d dudng kinh D s 1.000mm. Do v i y khi thye hign eae d n g tic liin quan d i n ddng cpc ong thep dudng kinh Idn d tai n i i Ccpc vdn ong thep) chua ed djnh m&e d l xic djnh chi phi. Vi viy, h l u h i t cac d n g t i c trong q u i trinh thi cong mong cpc ong t h i p dgng gilng phii thue d thilt bj, ky thuat va ap dgng djnh mire eua nudc ngoii (Nh$t Ban) cho d n g trinh d Vigt Nam.
Vdi nh&ng p h i n tieh t r i n cho thay mdng cpc SPSP c6 tinh kha dgng chua cao d l i vdi d c d n g trinh ngin song dgng d i p trg da.
b. Tinh k h i dung ciia mdng cpc ong t h i p dan:
Mdng cpc I n g thep dan l i mong cpc khdng mdi v l phuang p h i p va tieu chuin tinh toin. Khi x i t d i n khi nang irng dgng d a logi mdng cpc n i y d o d c d n g trinh ngan sdng dgng dgp tn,i dd, dugc x i t d i n d c
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KHOA HQC - CONG NGHE aaaaa
khia cgnh sau:
+ Ngoii ra, d n g t i c c h l tgo cpc I n g thdp d c logi.
cpc v i n I n g t h i p theo t i i u chuin c h l tgo v i v i t liiu d a Nhit B i n da dugc s i n x u l t d Vigt Nam.
N h i m i y s i n xult dat tgi Khu cdng nghigp Phu My 2 - T i n Thinh - B i Rja VQng T i u , dua v i o s i n xult v i o 09/2011 thuOc t i p d o i n Nippon Steel. Oilu n i y se riit n g i n cdng tac n h i p k h i u cpc ong thip;
+ V l m i t ky thuit thi edng cpc cua c i c n h i t h i u thi cdng trong nudc h o i n t o i n cd t h i dam nhigm dugc d n g t i e ddng cpc ong t h i p dan ed dudng kinh D 2 1000mm, t h i m chi l i d i n g cpc I n g t h i p x i i n d l d i thiin s&c khing lyc ngang. O i l n hinh nhu c i c logi t i u ddng cpc dugc c h l tgo trong nude: TOC 96;
TOC 97; TOC 09;... d t h i ddng duge cpc ed dudng kinh l i n tdi 1200mm, ddng x i i n 1:4 vdi bua ddng l i n tdi vdi biia (11+14) t i n ;
+ Cpc I n g t h i p dan h o i n t o i n c6 t h i ddng x i i n vdi ehilu d i i Idn, e l m xuong dugc Idp d i t t i t n i m s i u . T i n dgng dugc sdc khing dung cua cpc v i o khing ngang, dilu n i y giup eho s l lugng cpc giam khi cpc dugc lya chpn theo d i l u k i i n t i i trpng ngang. Oing thdi s l lugng cpc tinh t o i n b l trj cho tn,i pin It han nhilu so vdi mdng cpc SPSP;
+ CQng nhu viie s u dgng eie logi cpc dan khic, sau khi lya chpn dugc hg cpc thi v i n d l thilt k l biin phip thi d n g ehe trg pin cQng l i v i n d l d n g i i i quylt vdi d i p Trg dd cOt nude sau. Oe sii" dgng duge vdng v i y b i n g eu lessen thong dgng k i t hgp h i khung ching de thi cong trg pin, d n dam t i n g d n g cho h i khung ching. G i i i phap dugc dua ra nhu sau:
- Sir dgng cpc I n g van t h i p cd tai n i i dang me cu lassen. l i m vOng v i y k i t hgp cpc van ong thep v i eu lassen d l t i n g cirng eho h i khung vay.
- Su' dgng h i vdng v i y eu lassen thdng dgng.
nhung h i n g cpc I n g t h i p xu ly n i n xung quanh bg tn,! d l 10 l i n t r i n mgt nude. Sau dd hg khung ching d a khung v i y dugc tya v i o h i n g cpc niy. Vigc k i t hgp n i y l i m t i n g I n djnh t i n g t h i , dO tin d y cho h§ khung v i y khi thi d n g d cOt nudc sau v i ehju I n h hudng d a ddng c h i y trong sdng. Vigc chong Igi ngogi lyc d l i xung t i c dgng v i o vdng v i y d i u do h i khung ching d i m nhi$m.
Hinh 4: &ng dicing CQC ing thip dan cho d$p Tm d&
cdt nu&c siu
+ Phin cpc I n g thip n i m tren b i trg phgc vg thi d n g . sau khi duge d t thu h l i se hoin t o i n cd t h i tilp tgc sir dgng cho mgc dich khic dugc.
Nhung dilu t r i n eho thiy mdng cpc I n g thep dan cd tinh kha dgng k h i cao d l i vdi c i c edng trinh ngan song dgng d i p Trg dd.
4. Ket iudn
Vigc phin tieh v i lya chpn logi cpc x u ly n i n eho cdng trinh ngan sdng dgng d i p Tn.j dd i n h hudng r i t Idn d i n g i i thinh, dO tin d y trong thi cdng edng trinh. Cpc ong thip l i mOt logi cpc mdi trong c i c cdng trinh ngin song, nhung v l cdng nghg c h l tgo, v i t ligu v i bao vg chong an m i n d i d be day ljch su phit triln. Qua c i c phin d i trinh b i y d the nhgn t h i y duge nhung uu diem noi bgt eua cpc I n g thep, d i e bigt la kha nang ddng xien vdi dO x i i n d t h i dgt d i n 1:1,5 phg thuOc vao hg giin d i n hudng va biia hg cpc. Oilu nay s§ giCip giai quylt nh&ng khd khan trong edng t i e x u ly nen cho d n g trinh ngan sdng ehju tai trpng ngang Idn •
" TAl Lieu THAM KHAo" ^ " ^ ^ ^ ^ ^ [1]. Ho SO thiet kf cc| sd cic dng ngan trieu trong Quyfit fljnh so 1547/
QO-ng ngiy 28/10/2008;
& . [2].IV16ngc9C-Tifuchuinthietke-TCXD205-1998;
^ [3].TJi lifu "HOI thio quoc te ve coc ong thep 2 0 i r t a i Ha Noi, ngjy 21/02/2012;
[4]. Hd so thiet k( bSn ve thi coi^ c^u Nh|tT3n 10/2007;
[5]. Magazine STEEL CONSIRUCiON TOSDAY & TOiWORROW - No 32 - March 2011;
[6J. Magazine STEEL CONSTRUCTION TOSDAY & TOMORROW-No 33- July-2011, .
S l 5 nim 2013
