TH VIN PHP LUT
CNG QUAN TRC CU NGUYN VN TRI - TRN TH L S DNG H THNG QUAN TRC T
NG - TRUYN DN TN HIU THNG MINH
A IM: THNH PH NNG
1.Gii thiu chung v d n
Cu Nguyn Vn Tri Trn Th L nm trong thnh ph Nng, cch H Ni 764 Km v
pha Bc v thnh ph H Ch Minh 964 Km v pha Nam. y l mt thnh ph cng vi
vai tr v cng quan trng ca vng duyn hi trn b bin ng v nt giao thng
ni lin Bc Nam bng ng b, ng st, ng bin v ng khng. Cu dy vng vi cc
nhp s tri di bt ngang qua sng Hn, ni lin qun Hi Chu, qun Sn Tr v
Qun Ng Hnh Sn, ti v tr ca hai cy cu c l Nguyn Vn Tri v Trn Th L.
Hai cy cu ny s c tho d sau khi Cu dy vng mi hon thnh.
Hnh nh: V tr cu
Hnh nh: Bn v thit k cu
Quy m xy dng:Vnh cu.
Tn sut thit k:P = 1%.
Tnh khng:
Kh gii hn thng thuyn:Theo phng ng: H >=7m,
Theo phng ngang: B >=50m;
Kh gii hn ng b:H >=4,75m.
Ti trng thit k v cc tc ng:
Hot ti:Hot ti xe thit k: HL-93;
Ti trng b hnh: 3x10-3MPa.
Ti trng gi:Vng tnh gi : Vng IV.
Hiu ng ng t:Vng chn ng: Cp 6;
Chn ng cc i: Imax = 7 (MSK-64).
Kh cuB = 34,5m (3,5m + 11,25m + 5,0m + 11,25m + 3,5m).
Phn xe chy:6x3,75m = 22,5m;
L b hnh: 2x3,5m (di an ton mi bn cch mp ln xe chy 0,5m);
Di phn cch: 5,0m (di an ton mi bn cch mp ln xe chy 0,5m);
Kt cu thng b:S kt cu nhp: 4x50+230+45+4x50+30+26, Tng chiu di
731m, trong :
Nhp chnh: Nhp dy vng di 230m, b tr mt mt phng dy neo vi kt cu
nhp ti gia di phn cch. Tr Thp: Mt ct ngang dng hnh ch V bng BTCT,
nghing 12 v pha Ty cu (pha m S1), cao + 145m, c b tr sn vng cnh v
thang my.
Nhp dn: C cu to mt ct ngang dng dm hp BTCT DL.
Kt cu h b: M: Bng kt cu BTCT, mng m l h mng cc khoan nhi.
Tr: Bng kt cu BTCT, mng tr l h mng cc khoan nhi.
2.Gii php k thutCu nhp di bao gm cu dy vng l mt trong nhng cng
trnh c xy dng nhm mc ch s dng trong thi gian bn vnh cu. Tuy nhin,
trong qu trnh s dng theo thi gian, do tc ng ca nhiu yu t, cc kt cu
cu c th b n mn, g, xut hin vt nt, hao mn, lo ha, ph hoi mi, bin
dng, v. v...Do vy, vic qun l bo dng cu ng thi cung cp cc dch v bo
dng hp l c xem xt t giai on thit k l iu ht sc cn thit. Do , vic p
dng cc k thut quan trc kim tra tnh trng kt cu, mc thoi ha l iu khng
th thiu.Vic nh gi bn kt cu bng cch s dng d liu s khc nhau da trn mi
quan h tng quan gia cc yu t mi trng v phn ng ca cu, thm vo nh gi
tnh trng kt cu v mc thoi ha thng qua vic theo di s thay i theo thi
gian ca mi quan h ny.
2.1.Hin trng cng tc quan trc ti Vit Nam
Trong nhng nm gn y, cc cng trnh cu dy vng nhp ln c xy dng ngy
cng nhiu Vit Nam, rt a dng v kiu dng, kt cu, c cu to v trng thi lm
vic phc tp, nhy cm vi ti trng v cc tc ng, c bit l cc phn ng do cc
tc dng ng l gy ra. iu ny t ra thch thc khng nh i vi cc chuyn gia v
cc nh qun l l vic vn hnh, quan trc, bo tr dng kt cu hin i nhng cng
rt phc tp ny. Hin nay, cng tc quan trc ti Vit Nam ngy cng c ch trng
v vic o to cn b chuyn trch; hon thin quy trnh quy phm, hng dn s
dng; trang b h thng thit b hin i; phn tch nh gi s liu.
2.2.Cc h thng quan trc v ang c p dng ti Vit Nam. nc ta v ang p
dng hai h thng quan trc sau: S dng h thng quan trc kim tra, kim nh
nh k S dng h thng quan trc - chun on
S dng h thng quan trc kim tra, kim nh nh k: Thit b s dng l cc ng
h o, thit b o c hc, Thi gian o khng lin tc. chnh xc khng caou nhc
im ca h thng ny: u im: S dng h thit b n gin, tho lp, ph cp rng ri.
C th thu thp y cc tham s k thut cn thit phn nh trng thi lm vic thc
t ca cu ti thi im tin hnh kim tra nh k. Chi ph thit b v vn hnh thit
b thp. C th s dng mt b thit b cho nhiu cu. Nhc im: Cung cp s liu
khng lin tc, ch thu thp s liu thi im kim tra nn khng nh gi ht mc tc
ng ca ti trng v phn ng ca kt cu. Quan trc theo di khng mang tnh h
thng.
S dng h thng quan trc - chun on: Thit b s dng l cc thit b in.
Thi gian ghi nhn d liu lin tc. chnh xc cao.u nhc im ca h thng: u
im: Theo di thng xuyn, lin tc. Cung cp s liu y , chnh xc, mi thi
im. Phn tch v x l kp thi, chnh xc. Nhc im: Chi ph lp t thit b cao.
Chi ph vn hnh, bo dng tn km. i hi i ng k thut chuyn su, c kinh
nghim
2.3.Gii php k thut ca chng ti: ng dng v u nhc imng dng cng tc
quan trc cho cu Trn Th L Nguyn Vn Tri, chng ti tin hnh xy dng h
thng: Xy dng, pht trin h thng thu thp d liu t ng, thng xuyn lin tc
theo thi gian,bng cc thit b o c s dng cm bin (sensor). D liu thu
thp c lu tr t ng trn my ch; th nh;.Kt qu s c phn tch v nh gi lin
tc. Cc d liu thu thp c tp hp thnh mt c s d liu (database), n s c t
ng truyn dn bng mng khng dy ti cc thit b in t bng tin nhn,
email,
u nhc im: u im: Khc phc hon ton cc nhc im ca hai h thng v ang c
p dng Theo di thng xuyn, lin tc. Ghi nhn s liu y , chnh xc, mi thi
im, chnh xc cao. D liu c t ng thng bo lin tc cho cc bn lin quan bng
tin nhn, email,, c phn tch v x l kp thi, chnh xc. Chi ph lp t thit
b, vn hnh v bo dng thit b thp. C th s dng mt b thit b cho nhiu cu.
Khng i hi i ng k thut c chuyn mn cao.
Hnh nh: Thu thp thng tin v truyn dn
3.K hoch thc hin
3.1.Cc dng cng tc quan trc chng ti s dng v mc ch: o rung ca bn
mt cu: Kt qu o dng nh gi sc chu ti ca b phn kt cu trong qu trnh s
dng. o rung ca cp dy vng: Kt qu o dng nh gi sc chu ti ca cp dy vng
trong qu trnh s dng, o ng sut thp tr v bn mt cu: Kt qu o dng nh gi
s bin i ng sut, bin dng ca tr thp v bn mt cu trong qu trnh s dng. o
nhit thp tr v bn mt cu: Kt qu o dng nh gi kh nng chu ti, kh nng dnh
bm ca b tng nha trn bn mt cu. o gi: Kt qu o dng iu tit giao thng
qua cu, nh gi nh hng ca tc ng gi n kh nng lm vic ca cu. o nhit khng
kh: Kt qu o dng nh gi nh hng ca nhit mi trng ti kh nng lm vic ca cu
v iu chnh cc thit b s dng cho ph hp.
3.2.Gii thiu v cc cm bin s dngNu v mc ch s dng; cc c tnh k thut
ca thit b; Km theo hnh nh
a. Thit b o gia tc Accelerometerc s dng xc nh rung ca cp dy vng
v bn mt cu (km theo catalogue)
b. Thit b o bin dngStrain gaugesc s dng xc nh bin dng ca tr thp
v bn mt cu (km theo catalogue): c s dng cu Rch Miu
c. Thit b o nhit Temperature sensorc s dng xc nh nhit tr thp -
bn mt cu (km theo catalogue)
d. Thit b o gi t ng ghi KT 2000c s dng xc nh vn tc gi v hng gi
(km theo catalogue).1.Tn sn phm: My o gi hin s t ghi KT 20002.M t
sn phm: - c trng k thut: + Di o tc : 0.8 m/s n 60 m/s + Hng gi: 16
hng (theo m s quc t) + chnh xc: 0.1 m/s + Tc khi ng: 0.8 m/s + Tn
hiu ra: Hin s bng mn hnh tinh th lngHin gi, pht Hin ngy, thng, nm
Hin hng gi, tc gi + T ghi: Bng giy kh rng 57 mm + Ngun: AC
220V/150mA DC 6V/8A + Khong cch u o v my o: 100 mt3. Lnh vc ng dng:
- My o gi hin s t ghi KT-2000 dng o tc v hng gi cc i, Trm Kh tng
Thy vn v phc v cc mc ch khc nhau cho cc nghnh Hng khng, Hng hi, Nng
Lm Ng nghip v iu tra nghin cu nng lng gi v. v - My c th t ng in ra
s liu v tc v hng gi trung bnh trong 1 pht, 2 pht vo thi gian nh,
hng ngy vo lc 19 gi th in ra tc gi ln nht trong ngy v my c th o cng
bc vo bt c thi im no.4. u im ni bt ca sn phm: - My gm c 2 b phn
chnh: B phn cm ng v b phn ch th chng c ni vi nhau bng cp in nh 4
si. - B phn cm ng gm go o tc v phong tiu c ci tin, s dng phng php o
quang in o c tc gi v hng gi nhanh v chnh xc. - B phn ch th c cu
thnh bi b vi s l tn hiu, dung my tnh kiu HR-8L bn phm, hin s tinh
th lng v my in nh. My nhn tn hiu ca b cm ng tin hnh x l s liu. -
Phn ngun s dng in li 220V. c b ngun np c quy 6V-8A (trong trng hp
mt ngun in li c th hot ng thm c 70 gi)
e. Nhit k o nhit khng kh
3.3.B tr lp t cm binVic xc nh s lng, v tr lp t cc cm bin cn c
nghin cu c th t bn v thit k, thi cng. V vy cn cung cp y cc ti liu
thit k, thi cng chng ti nghin cu a ra bin php tt nht.
4.Kt qu quan trc, nh gi cc kt qu c ghi nhn a ra kt lun v kin
nghLp bo co kt qu
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