- May nang dan giim May nang ki~u cful
a.Ciu t\'o chung ciia diu tryc:
*ciu t\'o chung ciia cAutryc 2 dAm:
5 ._---- ._---- .-llJ.=-j- 3 4 6 I '0 p ~.
Hinh 3-12 cAu t(lOcua cAu tfllC hai dAm
1, Cabin di€u khi€n; 2. DAm cAu; 3. Xc con nang (h(l) v~t; 4. Co cAu nang h(l v~t; 5. Co cAu di chuy€n xc con; 6.CacAu di chuy€n cAu!r\lC.
. ....••( ...••(
. \\
cAu tI\1c co 3 co cdu: - Co cfiu di chuY6n cAutI\1c
- Co cfiu di chuy6n xe con tren dAm - Co cdu nang hl;lv~t
Nhu v~y, d6 nang chuy6n v~t trong khong gian lam vi~c cua cAu tI\1c cAn ki\t h9')J hOl;ltd(;\ng cua 3 C(J cfiu neu tren: co cfiu nang hl;l v~t se nang v~t len hl;l v~t xu6ng theo phuong thfutg dUng,C(J cdu di chuy6n xe con lam thay d6i vi tri v~t theo phuong ngang, co cfiu di chuy6n cAu tI\1c lam thay d6i vi tri v~t theo phuong dQc ray di chuy6n.
3.4.2. cong trl,lc
C6ng tI\1c la lo(li may nang co dl;lngc6ng, co th6 di chuy6n dugc tren hai dUOng ray dii,ttren mii,tdfit hoii,c I~p dii,tc6 dinh.
C6ng tI\1c thuOng dugc dung d6 co gi6i hmi cong mc xi\p dO't(li cac kho biii v~t li~u xiiy d\ffig va cac bill duc cac cfiu ki~n betong; dung d6 I~p rap cdu ki~n va thii\t bi trong cac cong trinh thuy di~n, nhi~t di~n. c6ng tI\1c c6 dinh dugc dung d6 nang hl;ldong rna cac cua van trong cac cong trinh tran xa Iii thuy 19i,thuy di~n.
TruOng h9')Jnha xuang dii co sfuI, vi~c I~p dii,tray va cAu tI\!c trong nha xuang se gii,p nhi6u kho khan, nguOi ta co th6 dUng c6ng tI\!c thay cho cAu tI\!c.
, J', i'... ij. ,."' ." •r.'#.1•• ~'. ,:faJ.iJ I 12.~J I faJ.iJ I 12.~J I 'U'.I. ",~ 0'1' I....J . -- , __ "~ ",.r;-.~. ., ..._,.~~~ ~-- n _._-:.JoU" =a~:.d:Qo ~-==':::7 ~ I ~1j Hlnh 3- 13:C6ng !rile
I. TiYidi~n dao ehi~u; 2.DfuncAu;3. Xe can nang v~t; 4. Palling nang v~t; 5. Dilm d1i';6.Cabin di~u khi~n; 7. Cae chan ebng; 8. Xe can di ehuy~n ebng trve;
9. Pa langdi~n;IO.II,12,13. Cae tiri
3.5. MAy NANG KIEU KHUNG C(>T HUONG DAN (V~ thang)
V~ thang thuang duqc l~p t\l'a vito toit nhit dang thi cong, dUng d~ v~ chuy~n v~t li~u vit cac cAu ki~n len cao. Khi thi cong cac toit nhit co dQ cao 16'11,nguoi ta con dUng v~ thang d~ v~n ehuy~n nguiri, citi thi~n di8u ki~n di 1I,licUacong nhan.
V~n thiing lit mQt thi~t bi nang h(l dUng d~ thi cong caccong trinh nbit cao tling, ho\ic mQt s6 truang hqp d\ic bi~t dUng d~ thi eong cae cong trinh ngllm duro long dAt, tha til dinh nlii xuong. Co du chuy~n dQng cua v~ thang d\l'a tren co du thanh rang, khac v6i thang may v~ thiing co co diu chuy~n dQng an toan hon, cac dQng co duqc g~ blinh rang, blinh rang lien k~t vro thanh rang, khi dQng co hO(lt dQng cae blinh rang nity an kh6p vro thanh rang d~ t(lO ra chuy~n dQng len xu6ng. V~ thang co nhi8u 10(li model my thuQC vito nhu du ding nhu yeu cliu ky thu~t cua timg cong trinh, timg nha thliu xay d\I'Dgmit co cae 10(li model khac nhau
Hi trQng nang: 0,3 d~n O,ST Chi8u cao nang: SOm
V~ t6e nang v~t: 0,3 d~n O,Smls May nang nguai :
Trong xay d\I'Dg,nguiri ta con dUng may nang nguiri d~ th\l'e hi~n cac cong vi~c nhu quet voi, lau eua kinh nhit cao tling, l~p d\it thi~t bi len trlin nhit trong cong tac hoan thi~n, l~p d\it sua chua h~ th6ng di~n chi~u sang tren duang ph6,v.v ...
Ca bi n Qj~U!illi~D
\
Hlnh 3- 14: V~ thang
. Nang suAt sir d1,lllgtrung binh cua cfut ttvc diIng trong xay d\Il1g duQ'c xac dinh theo cong thuc
N.I =Q.kqk,g.n(T/h) (3.2)
Trong do:
Q- tai tn;mg nang cua cfut tf\lC(T)
Kq va ktg- h~ sa sir d\lng tai trQng nang va h~ sa sir d1,lllgthm gian, lAy theo thi~t bi mang v~t: vai moc treo (Kq = 0.8 -;.0.9, Ktg= 0.8 -;-0.88);
Vai gau ngo\Ull (kq= 0.8 -;-0.9, Ktg= 0.85 -;.0.95)
3600 < h k'l' '- ,> t -t" " t I'n = -- - so c u y am vu;c cua can tf\lC rong mQ gUYvm 'Ok a n = -- - so c u y am vu;c cua can tf\lC rong mQ gUYvm 'Ok a
T'k
thm gian trung binh cua m(\t chu ky lam vi~c (s)
Trong trirong hqp t6ng quat, m(\t chu ky lam vi~c bao g6m cac thm gian sau: !ok=tn+ th+ 2td,+2tq+ 2ttv+ tl+ t2+tp (s) (3.3) trong do:
(Ht+h) th'" - - ( ) tn = ~: m glan nang v~t s
HI: chieu cao cua cong trinh (m)
h: khoilng cach tiI mij.ttren Clla c<\ngtrinh d~n mij.tduai cua v~t nang (m) vn: tac d(\ nang (m/s)
th =(H, +h) - thm gian h\1 moc treo khong tili sau khi da Hip v~t nang v~o vi tri c~ .. Vhth
thi€t vm t6c di} h\l nhanh (n€u clk tT\1cco hai t6c di) h\1) d~ rut ngfut thm gian h~ th=
tn n€u t6c di} h\1bfutg t6c di} nang .. .
tdc=JL: thm gian di chuy~n clk tl"\lC(s)
Vdc
In: chi~u dai quang dubng di chuy~n (m) Vdc:t6c di} di chuy~n clk tT\1c(m/s)
t = ~: thm gian quay (s) q 6q"
a: goc quay cua clk tT\1c(di})
nq: t6c di} quay cua clk tr\lC (vong/phUt) ttv=..!L: thai gian thay dili tfun vm (s)
v"
11:qilang dubng v~t nang di chuy~n theo phuong ngang khi thay dili tfun vm (m) Vtvt6c di} thay dili tfun vm (m/s)
t, =ho : thm gian h\1hang xu6ng vi tri I~p nip (s)
v .
yo:t6c di} h\1l~p nip (m/s)
tz =J:. :thai gian nang moc treo len vi tri I~p nip sau khi da do hang (s) v"
tp: thai gian cac cong vi~c lam bfutg tay (d6i vrn moc treo) g6m thm gian bui}c hang, thm gian do hang tren moc treo 0vi tri I~p nip d~ chinh va c6 dinh, thm gian do moc treo va day chfutg khoi hang
Nang suat sir d\lllg clk tl"\lCtheo ca ho(ic nam:
Nca=N",.T (T /ca);(T/ca(nam» (3.4) Trongdo:
T la s6 gia sir d\lllg may trong ca (nam) xac dinh theo ch€ di} lam vi~c th\Ic t€ Clla clk tl"\lC.