- D~p hiOOcong kh6ng co chan kh6ng cua Carigia - Ophixer6p: m =0,48 +0,49
- D~p hiOO cong co chan kh6ng cua Carigia - Ophixer6p: m = 0,52 +0,56 ( trung biOO)
- D~p m(it c~t hiOO thang: m ph\l thuQc vao P, S" S2, 1i...(hiOO4-11); tra theo bang PL 9-1, ph\ll\lc 9
H
P
(4-6)
(4-6)a
- D~p dinh fQng: m ph\l thuQc vaa hinh thuc cua vaa; tra thea bang PL 9-2, ph\ll\lc 9.
- D~p khong co ngufmg: m ph\l thuQc vaa hinh thuc cua vaa, muc dQ thu http cua ~p; tra m thea bang PL 9-3, ph\ll\lc 9
E:H~ s6 ca http ngang, tinh thea cong thuc:
= 1 _0 2 ~b+(n-l)~g H,
E , .---~.
n b
Ha~c co the tinh thea cong thuc don gian sau: B
E-
B+Ld
~b:H~ s6 hinh c4mgm6 ben.
Khi dAum6 vuong ~b=1,0; dAum6 trim ha~c vat ~b=0,7
~g: H~ s6 hinh d(ll1gm6 m6 gifra (xem hinh 4-7), co the I~y trung binh nhu sau: Khi dAum6 vuong ~g= 0,8+ 1,0; dAum6 tfim ha~c tam giac ~g= 0,5 +0,7; dAum6 hinh luu tuy~n ~g=0,3+0,5
n: 86 khaang Cllad~p
b: Chieu tQng 1 khaang tfan Cllad~p ( b=Bin ).
Ld :T6ng chi€u day Cllacac m6 gifra
0-: H~ s6 ng~p cua d~p, tra bang PL 9-4,ph\lI\lc 9
<Pn:H~ s6 luu t6c khi chay ng~p Clla ~p tran dinh fQng, tra bimg PL 9-5, ph\ll\1c 9
e. Chi lieu ngt{ip eua at{ip
- D~p chay ng~p khi thoa man cac di€u ki~n sau:
+Mgc nuac h(l luu phai caa hon dinh d~p, tUc hn >0
+N~u la d~p thgc d\lng: ZI P < [ZIP]pg. Tq s6 [ZIP]pg tra bang PL
9-6, ph\ll\lc 9.
+N~u la d~p dinh fQng: hoi IL, > [hn/IL,]pg.
Trj s6 : [hn/IL,lpgco the I~y gAlldUng: [hn/IL,]pg=0,75+0,85
3. Trinh 4rtinh toan
- ChQn trucrng hqp tiOOtoan : D~p thao veri t$llii thiet ke ho~c Iii kiem tra. Tan sudt Iii thiet k6, kiem tra xac diOOtheo ph\ll\lc 3
- TiOOtoan chQn B, H cua ~p: Thucrng ti6n himh tiOOva chQn OOusau:+Can cu vao d~c trung dia hiOO,dia cMt tuyen d~p chQnsabQ B (can b6 tri +Can cu vao d~c trung dia hiOO,dia cMt tuyen d~p chQnsabQ B (can b6 tri thu cac bQ ph~ cua vao, ra, b6 tri cac khoang ~p)
+ Can cu 10(1id~p, chQn cong thuc va tiOO toan H. Neu thuqng lUll co h6 dieu ti6t thi khi tiOOphai xet d6n kha nang dieu ti6t Clla h6.
+ Kiem tra muc dQ ng~p l\lt athuqng lUll, lUll luqng dan vi qua tran ...Neu chua dUQ"cthi chQn l(1iB va tiOOl(1i.
4.4.2. ThiSt kS thiSt bi tieu nang
1. Khtii quat chung
Dong chay sau d~p tran dUQ"cn6i ti6p vai h(1 lUll theo nhieu hiOO thuc: N6i tiep bfuIg dong chay day, n6i ti6p bfuIg dong chay m~t va n6i ti6p bfuIg dong chay rai tl,r do.
N6i ti6p bfuIg dong chay m~t giam dUQ"ckh6i Iuqng xay d\ffig phAn tieu n~ng OOieu OOung dong chay thucrng khong 6n diOO, nen chUng chi thucrng dUQ"c sir d\lng trong OOiing trucrng hqp ca bi~t, vi d\l khi nen va biYdeu la da t6t.
N6i ti6p b~ng dong chay rai tl,r do chi thucrng dUng cho tran xa Iii trong h6 chua va khi nen la da.
N6i tiep bfuIg dong chay day la d(lng 6n diOO, d~ xay d\ffig va co the xay d\ffig veri mQi 10(1inen, vi v~y no dUQ"csir dvng rdt rQng rai trong mQi 10(1icong triOO. Thi6t bi tieu nang b~ng dong chay day thucrng dung la be tieu nang, 10(1i tucrng tieu nang hay be tucrng k6t hqp it dUQ"csu dvnghan.
Noi chung vai cac d~p vira va thdp, d~p co quy mo 006 nen chQn d(1ng be tieu nang.
2. Tinh toan, thih ki tieu nang brmg bi tieu nang a. Tinh va ch(Jn truimg h(J]Jtieu nang bdt It;rinhdt.
Trucrng hqp tieu nang bil.t lqi OOdtla trucrng hqp cho tri s6 (he" - hh)max • ChQn trucrng hqp tiOOva diOOhuang tinh toan: