iu khin d bo ng c khng ng b rotor lng sc ta hng t thng rotor v nui bi bin tn ma trn

THIT K BIN NGHA HNG- NAM NH

Ging vin hng dn:ThS. Nguyn Th Phng ThoSinh vin thc hin: Nguyn c Hun MSV: 1051080643Lp: 52B1TRNG I HC THY LI H NI N TT NGHIP1Ni dung thc hin2Gii thiu chung v khu vc nghin cu

Tnh ton iu kin bin thit k

Thit k bin Ngha Hng

Tnh ton n nh cho cng trnh234121.1. V tr a l, c im a hnh a cht, dn sinh, kinh t

1. Gii thiu chung v khu vc nghin cu.3a hnh ng bng tng i bng phng

a cht gm 3 lp :

Din tch: 250,5 km2

Dn s: 199.300 ngi( nm 2001)

Ngha Hng l mt huyn pha Nam tnh Nam nh

1.2. iu kin kh hu,kh tng, thy hi vn v c trng dng chy.

1.2.1. c im kh hu, kh tng : nhit , gi, ma, bo.1.2.2. c im thy hi vn.Thy vn: Hi vn: Ch thy triu: mang c tnh chung ca thy triu Vnh Bc B.Ch sng: ma h sng vung gc vi b bin, ma ng sng nhn chung trng vi hng gi ma ng Bc.Nc dng: bt c cn bo no vo Vnh Bc B u trc tip gy ra nc dng cho b bin Nam nh.1.2.3. c trng dng chy: dng triu( thun nghch), dng chy do gi.

4Ngha Hng c b bin nm pha nam huyn, nm trong vng b bin thuc vng nam ng bng Sng Hng, huyn c b bin di 12km, pha ty gii hn bisng y, ranh gii pha ng lsng Ninh C. Vng tip gip vi casng Ninh Cl cc bi ct, cc n ct v m nc mn. pha ng khu vc l cc m nui trng thu sn. 41.3. Hin trng khu vc nghin cu.

Bi bin Ngha Hng thng xuyn b xi l, h thp qua cc nm.

Nguyn nhn xi l u tin cn phi k n l: cc yu t ngoi sinh thng xuyn tc dng vo ng b bao gm, sng gi, dng chy, bo bin i mc nc, cc yu t ng lc dng chy ( dng triu, dng do gi, dng do sng, sng trong sng ra), sng th gm c (sng bo, sng do gi).

Ngy nay do qu trnh hot ng sn xut con ngi thng xuyn tc ng vo thin nhin vi cng cao hn lm cho thin nhin bin i theo chiu hng bt li nh: ln bin, thy li xy dng p lm lng bn ct vn chuyn ra bin t hn l nguyn nhn gy xi.551.4. xut gii php bo v.

6Cc gii php bo vGii php phi cng trnhTrng cy chn sngGii php cng trnh

p ph sngXy dng bin=> Gii php bo v hp l nht l xy dng bin62. Tnh ton iu kin bin thit k.72.3 Tnh ton cc tham s sng nc su thit k

2.4 Tnh ton tham s sng thit k trc chn cng trnh

2.2. Xc nh mc nc thit k2.1 Xc nh tuyn cng trnh v cp cng trnh

72.1. Xc nh tuyn cng trnh v cp cng trnh.

82.1.1. Xc nh tuyn cng trnh.

2.1.2. Xc nh cp cng trnh.

Theo tiu chun hng dn thit k bin 2012 th tiu chun an ton cho bin x Nam in c chu k lp li l 50 nm..Theo hng dn thit k bin, cp bin c xc nh nh sau: bin c phn lm 5 cp: cp I, cp II, cp III, cp IV, cp V.Vi T= 50 nm, cp thit k l III v tn sut thit k P= 1/T=1/50= 2%Cp IIIIIIIVVTCAT(chu k lp li: nm)150100503010

82.2. Xc nh mc nc thit k.9

ng tn sut mc nc tng hp ti im MC16 ( ) Ngha phc,Ngha hng, Nam nh

Da vo hnh trn ta tra c MNTKptra = 3,27 (m).

9T ng tn sut sng cc tr ta c mc nc triu ng vi tn sut 2% l: H0 = 6,97 (m).

2.3. Tnh ton cc tham s sng nc su thit k.102.3.1 Chiu cao sng nc su H0

2.3.2. Xc nh chu k nh (Tp)

Chu k sng momen ly t cng thc ca Nguyn Xun Hng: Tm = 5.4* = 5.4 * 6.970.16 =7.43

Chu k nh ph sng:Tp = 1.2* Tm = 1.2*7.43=8.92(s)

2.3. Tnh ton cc tham s sng nc su thit k.

2.3.3 Xc nh chiu di sng nc su (Lo) Chiu di sng nc su: L0 = = 124.12 (m)

2.3.4 Xc nh dc sng (s0). S0 = = 0.056

2.3.5 Xc nh gc sng ti ti bin nc su (0)i vi bin khi thit k ngi ta thng chn trng hp bt li nht (sng i trc din vi bin), cho cng trnh m bo an ton 0 = 0.Kt lun: vy gc sng ti ti bin nc su 0 = 0.

11

112.4. Tnh ton tham s sng thit k trc chn cng trnh.122.4.1.Cc qu trnh bin i sng khi tin vo vng ven b.Hiu ng nc nng.Hin tng khc x sng. Sng v.2.4.2. Chiu cao sng thit k t nc su vo cng trnh.

STTMt ct 1Mt ct 2

Mt ct 3

Hrms (m)0.650.60.85 Hs (m) 0.920.851.2

123. Thit k bin Ngha Hng.3.1.1. Chiu rng nh .Theo tiu chun thit k bin ng vi cng trnh cp III c chiu rngnh B = 5 (m).3.1.2. H s mi .Theo tiu chun thit k bin ta chn m = 2 vi mi pha ng, cn mipha bin ta chn thay i khc nhau ty theo tng phng n khc nhau. 3.1.3. C pha binChn c c b rng B=4m,cao trnh mt c = +3,27m.3.1.4. C pha ng: bin Ngha Hng khng cn b tr

133.1. Tnh ton kch thc hnh hc ca 133.1.Tnh ton kch thc hnh hc ca .3.1.5. Cao trnh nh .a. Xc nh tiu chun thit k. Theo tiu chun sng trn, lu lng trn cho php [q]=10(l/s/m)b. Tnh ton cao trnh nh .Z= MNTK+ Rcp+ aTrong MNTK= 3,27m a ( Tr s gia tng an ton ca ) vi cng trnh cp III, tra c a=0,4m

14

Khi 2

Khi 2 < < 7

Khi >7

14

3.1.5. Cao trnh nh .

Trong : + q: Lu lng trn n v (l/s/m);+ Hm0: Chiu cao sng thit k ti chn cng trnh (Hm0 = Hs) (m)+ Ch s tng t sng Vi : Gc ca mi .S0 : dc sng; S0=Hs/Lm-1,0 : H s chit gim do sng ti xin gc: Trong tt c cc phng n coi gc sng ti vung gc vi b (=0o) nn =1.f : H s chit gim do nhm trn mi dc ly theo Bng 1-Ph lc C Tiu chun k thut thit k n bin Chn vt liu lm mi l cu kin b tng .Ta xc nh c f= 0.9

15

153.1.5. Cao trnh nh .16 v : H s chit gim do tng nh: y ch xem xt n k khng c tng nh nn h s chit gim sng trn do tng ng v= 1.b : H s chit gim khi c c c xc nh theo cng thc sau: vi 0,6 b 1.0Trong : Bc - B rng ca c (m); Lc - Chiu di tnh ton ca c (m). Lc = Hs.m1 + Bc + Hs.m2dh ngp su ca c (m); Vi dh = 0 nu c nm ngang vi MNTK

163.1.5. Cao trnh nh .17

= 2,07= 2,3

173.2.1. nh Thit k theo tiu chun sng trn nn chn bin php bo v l b tng. B dy ca lp b tng M250 bo v l 25cm. Pha di l lp dm dy 15cm. Tip theo l lp ct vng gia c dy 5 cm. Mt nh dc v pha bin, dc i= 1% Cao trnh mt = + 5,7 m La chn b rng nh l 5m3.2.2. Mi a. Gia c mi pha ng: dng bin php trng cb. Gia c mi pha bin: trong thit k bin huyn Ngha Hng ta la chn kt cu bo v mi phi bin l cu kin b tng hnh lc lng.* C : lp mt chn b tng M250 dy 20 cm,pha di l lp dm (1x2) dy 15 cm,tip theo l lp ct vng dy 5 cm, cao trnh mt c = +3,27m.

3.2. Thit k chi tit cc kt cu bo v.183.2.2. Mi .19c. Tnh kch thc bo v mi: :H s cht lng n nh mi k (xc nh theo loi o k): chn kt cu k t nhin cht lng tt nn chn =2 :hm s biu th cho ngng chuyn ng/n nh ca vt liu:Pb: H s phn nh kh nng thm/thot nc ca thn v nn k; thng chn Pb=0,1 i vi k bo v mi ; Sb: Tham s h hng ban u, c th ly bng 0,5 n 2,0 i vi cu kin b tng c sn,ly Sb=2N: S con sng ti chn cng trnh trong mt trn bo Tb: thi on bo (gi), thng khong t 4 n 6 gi ly Tb=6Tm: chu k sng trung bnh. Tm = 7.43s. Thay s vo cng thc ta c: = 2,01

193.2.3. Thn v nn .a. Thn : Vi iu kin t p sn c, do la chn kt cu nn l t st pha ly ti chb. Nn .+ X l nn bng m ct.+ X l t nn bng m cc ct.+ X l nn bng vt liu c kt: khoan pht va xi mng hoc t st.+ Gii php thi cng phn chia giai on p hp l tng c kt ca nn.

20203.2.4. Lp lc. Vi a cht lp trn cng l ct ht mn, hin tng ct b xi sau khi xy dng cng trnh c nhiu kh nng xy ra dn n ph hu cng trnh. Do vy m bo tnh an ton v n nh cho tui th ca cng trnh th vi lc KT v ang c s dng ph bin rng ri trong thit k v thi cng cng trnh bin hin nay.

2121a. Phn loi: Chn k nng, chn k su.b. su h xi ti hn. Smax =1,5 Hs =1,5.1,2 = 1,8(m)c. Chiu rng lp bo v chn k: b rng chn k c th ly trong khong gi tr t (3- 4)Hs= (3,6- 4,8)m.Chn b rng lp bo v ngoi chn k: Bchn k = 4 (m).

d. Kch thc chn k:

3.2.5. Chn .22

=1,99 (m/s)

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