NGHIEN Cflu TRAO 0(5l
CO-A VAN VIEN PHAN XOAY (ROTARY SEGMENT GATE) TREN CAC CONG TRINH NGAN SONG LON
ThS. Ho Sy San Khoa Co khi, TrU6ng Dai hpc Thuy loi
TOMTAT
Nhu cdu xdy dung cdc cdng trinh ngdn song Idn d Viet Nam dang la doi hoi cdp thiet digdp phdn chong lai cdc thiet hgi do biin dot khi hdu gdy ra. Trong cdc cong trinh ngdn sdng, cUa van vd cdc thiit bi dong mdgia mgt vai tro quan trgng. Mot trong nhUng loai cita van dUdc sU dung hieu qud tren cdc cong trinh ngdn sdng Id cUa van vien phdn xoay.
ABSTRACT
Building river barrier in Viet Nam is much more necessary in order to restrict damage of climate change. In river barrier system, hydraulic gate and lift gate equipments keep importdc giant role. One kind of gate that using effective is rotary segment gate.
I.DATVANDE
Viet Nam co nhieu con song 16n d6 ra bd bien trdi ddi hon 3000 km. Cfla song chiu dnh hilcing rat Idn cua hien tuong thuy trieu. Trong nhflng nam gan ddy, he thong song ngoi tren lanh tho Viet Nam thu5ng xuyen bi ngap lut do nU6c bien dang, dac bitt la he th6ng song ngoi, kenh r^ch d dong bang Song Ciiu Long va Thdnh pho H6 Chi Minh. Cong them dnh hilcing cHa bien doi Wli hau, tinh trang niicfc bien xam thijc d cac cita sdng ngdy cdng tram trong. TrUdc thUc te nhu vdy, nhu cau xdy diing cdc cong trinh ngan song da
trd nen cap thiet, trong do, cila van vd cdc thiet bi dong md giii mdt vai tro quan trpng.
Tren cdc cdng trinh ngdn sdng, ciia van cd nhieu dac tinh ky thudt phiic tap hon so vdi cdc cdng trinh thdng thudng vd cdc cdng trinh dau mdi. Hinh thiic ciia van phdi dam bao van de chiu lUc, phu hgp vdi dac diem, nhiem vu cua cdng trinh. Dac biet ciia van phdi ddm bdo dieu kien giao thdng thuy la yeu can hdng dau. Chinh vi vay bai bdo di vao phdn tich mdt loai hinh eia van tren cdc cdng trinh ngan sdng ddp ling duoc cdc yeu cau nay.
TAP CHi CO KHl VIET NAM V S6 4 (Thang 4 nam 2012)
NGHIEN cflu - TRAO QOI
cau chdn chdn. Ngodi ra, do cd liic day ndi rat Idn nen cd the \0i dung tinh chat nay de tdi Uu hoa ket cau vd qud trinh van hdnh. Tuy nhien, khi ciia md thi lodn bp ciia ndm diidi day sdng nen hoat dpng ddng md cila chju dnh hildng Idn ciia phii sa boi tich.
3. Hfi T H 6 N G DifiU KHIEN D 6 N G M 6 CITA VAN V I 6 N PHAN XOAY
:, v ^ 7*- 'u ^i yr
Hinh 1: Cfla van vien phan xoay 2. GlCfl THIEU C I T A VAN VIEN PHAN XOAY
Cfla van vien phdn xoay dflpc Charles Draper gidi thieu nhflng khai niem ddu tien vd dflpc dp dung lan dau tren sdng Thames vdo nam 1982. Cfla gdm cd mdt vien phan d gifla d l chan nfldc va dflpc lien kit vdi hai dia trdn hai dau. Dia trdn lien kit vdi true quay ddt tren hai gdi quay d trong tru pin hai dau.
Khi efla md, ed cau ddng m d lam quay dia trdn hai dau, phan vien phan cfla quay xuong dfldi, mat ddy cung nam sdt ngfldng day. Khi cfla ddng, dia hai dau quay trdn 70 ~ 90" theo chilu ngfldc kim ddng hd, phdn vien phdn efla chdn nfldc ngdn each gifla thfldng lflu va ha lflu.
U'u diem noi bat cua cfla van nay la kit
Ddng md cfla nhd sfl phdi hdp gifla xi lanh liln kit vdi dia quay hai dau vd qua trinh bdm, thao nfldc vdo cdc khoang ehfla trong vien phan efla vd dia quay.
Van hanh cfla van cd ba vi tri chinh: Vi tri 1 vien phdn efla ndm ngang d vi tri day trong eac trfldng hdp md cfla cho thuyen di lai qua cong trinh. Vi tri 2 vien phan cfla nam nghieng goc 70 ~ 90 dp chdn ngang ddng sdng de ngdn trieu.
Vi tri 3 ban mat nghieng gdc 180 dp sfl dung khi sfla ehfla, bao dfldng efla van. Nhd phfldng phap ddng md nhfl vay nen kit cau cdng trinh khong h i dnh hfldng d i n dp tinh khdng cua giao thong thuy.
4. KET CAU ClfA VAN VIEN PHAN XOAY
Hinh 2: Kit cau cfla van vien phan xoay Kit cau cfla van thfldng Id kit cau gian chiu lflc bpe tdn ben ngoai hoac kit cau dam hop chiu lflc. Tuy nhien, kit eau dang dam ed kich thflde tdng the nhd gpn, de che tao, gia thanh th, nhflng cd khdi Ifldng tfldng ddi Idn. Hdu hit cac cfla van vien phan xoay da lap ddt tren cac cong trinh ngan sdng the gidi deu sfl dung kit cau dang dam.
TAP CHf CO KHf VIET NAM Sd 4 (Thang 4 nam 2012)
i'l^yiENCdU - TRAO D6|
Vdi ket cdu dang dam, mat cong vd mat day cung cua phan vien phan e i a deu hdn bang then ,im cd chieu day khdc nhau tiiy theo tiing vi tri chiu tdi. Ldn nhat la phan ddy va mdng dan ve hai phia. Trong long cua viSn phan dupc hdn cac vach ngdn dpc theo chieu ddi va cd cdc tam gan lien ket tang Cling cue bd. Cdc ngan cung dUdc phan bd sao cho thuan tien cho viec bom vd thdo nUdc dan trong qud trinh ddng, md c i a . Nhu vdy, cac vdch ngan viia bao ddm ben vd dn dinh ciia ciia van viia tao thdnh cdc khoang chiia nUdc dan. Thi tich cdc khoang chiia phii hop luc ddng md, thuan tien viec bom vao va thdo niidc ra.
5. KET LUAN
Ciia van ndi chung va ciia van khau dp ldn ndi rieng rat phong phu va da dang v« chiing loai vd ke't cau. Cd nhieu ket cau cila mdi, moi loai ciia van deu cd nhiing dac diem rieng phii hpp vdi nhiing dieu kien nhat dinh, do do de" gidi quyet tdi Uu bdi todn kinh te ky thuat mpt cdng trinh cd the se phai Idp nhieu loai cila van khdc nhau. Vdi cdc cdng trinh ldn die'n hinh thudng sii dung mdt cia van vien phdn xoay de thdng thuy cac con thuyen ldn, mot cila van cung de" thdng thuy cac con thuyen nhd hon vd nhieu ciia van phang khau do ldn de ngdn song. •
Tdllieu tham khao;
[1]. Nguyin Dang Cudng, Hd Sy Sdn (2009), "Nghien cilu tiem nang ling dung c i a van vien phan xoay (rotary segment gate) vdo cdc cdng trinh ngan sdng ldn d Viet Nam", Tuyen tap bdo cdo khoa hoc - Dai hpclhuyLpi, tr.21-27.
12). Nguyin Ddng CUdng (2003), Mdy ndng chuyen vd thiet bi cila van , NXB. Xay diing, Hd Npi.
(3]. RIGO Philippe (2008), Design of Movable Weirs and Storm Surge Barriers, IMCOM WG 26 final report, Belgium.
[4]. Eebisti (2004), Design of Hydraulic Gates, A.A.Balkema Publishers, The Netherlands.
[5J. Lewin.J (1995), Hydraulic Gates and Valves in Free Surface Flow and Submerged Outlets, Thomas Telford Publiccations, London, England.
TAP C H l C O K H i VIET NAM V S6 4 (Thang 4 nam 2012)