propusti j. despotovic
DESCRIPTION
propustiTRANSCRIPT
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J. Despotović
PROPUSTI
objekti za proticanje - propuštanje povremenih i stalnih vodotoka na
mestima ukrštanja sa objektima i saobraćajnicama
april 2006. g.
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Slika 3. 1
Položaj propusta u situaciji, idealan...
osa t rupa put a osa t rupa put a
osa propus t a osa propus t a
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Slika 3.21
a b c d e f
osa t rupa put a
vodo
t ok
vodo
tok
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Slika 3. 2
Položaj propusta u poprečnom preseku trupa i odgovarajući efekti
(a) (b)1
J ezero - Ret enzija 1(c)
Presek 1-1
Propus t
S l ik a3.5_ d.cdr
(d)
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Slika 3. 3
Poprečni preseci prirodnog korita i kružnog i kvadratnog preseka propusta
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Slika 3. 4
Mera propusne moći prirodnog korita - AR2/3 i izabranih preseka propusta
1
2
3
2 4 6 1210
[ ]m
[ ]m8 /3 m] [ ,
=M , L0 M M M pr
h = = hprDA pr
H A pr
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Slika 3. 5 Propusna moć propusta u zavisnosti
od ulaznih, linijskih i izlaznih uslova
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Erodiran nizvodni kraj propusta
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Slika 3. 6
Netipične ulazne glave propusta
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Nestandardan ulaz u propust, ali vrlo ograničenog kapaciteta – propusne moći
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Slika 3. 7
Vrste ulaza u propust
Ugao krilnog zida Ugao skret anja vodot oka
a) b) c) e)d)
Slika 3.3_ d .c d r
vodot ok
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Slika 3. 8
Vrste ulaznih glava u propust
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Slika 3. 9
Kontrakcija mlaza kod oštrog ulaza u cev
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S l i k a 5 - 9 5 . c d r
Shema proračuna propusne moći
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S l i k a 5 - 9 5 . c d r
Proračun protočne moći propusta
2 ( )v kr krQ C A g H h
v vC C
0,75 0,95vC
1. H je nedovoljno za potapanje ulaza: H < D
(geometrija ulaza)
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S l i k a 5 - 9 5 . c d r
Proračun protočne moći propusta
0
2qQ C A gH
q qC C
0,45 0,75qC
2. Potopljen ulaz: H ≥ 1,3 ÷ 1,5 D
(geometrija ulaza, H/D)
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S l i k a 5 - 9 5 . c d r
Proračun protočne moći propusta
2 ( )izlizl
ul lin izl
g H z KhQ A
0,75 0,95K
ul ul
3. Ispunjen ulaz u propust
....K=K (geometrija ulaza)
(geometrija ulaza) ... 0,55 0,9ul
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Slika 3.10
Uloga krilnih zidova i spuštenog dna ulazne glave propusta
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Slika 3.11
Uloga i efekti postavljanja čeonog zida radi ekonomičnijeg korišćenja profila:
~eoni zid
linija nivoa kada...... pos t oji ~eoni zid
... nema ~eonog zida
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Primeri nepotopljenih izlaza iz propusta
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Slika 3.12 Nagib dna je veći od kritičnog, Uzvodni presek, sa hk je kontrolni !
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Slika 3.13
Nagib dna veći od kritičnog nagiba; Visoka donja vodom formira hidraulički skok; Kontrolni presek je ulaz u propust.
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Primer postavljanja više cevi radi
propuštanja merodavnog doticaja
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Slika 3.15
Nagib dna manji od kritičnog nagiba; Kontrolni presek je izlaz iz prpusta.
S l ik a3-19_ d.cdr
K
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Ko nađe ulaznu glavu propusta, dobije...
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Slika 3.16
hh3
L
Slika 3-21_ d .c d r
D
K
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Evo ulaza u propust, pa ma šta ...
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Slika 3.17
Hh
L
K
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Delimično potopljenaizlazna glavapropusta
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Slika 3.19
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Slika3.20
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Dubina na nizvodnom kraju h3 >hkr
Da
Ne
h=hn h=hkr
h > D ?
Da
Ne
NeDa
Ne
Da
Da
Prora~un linije nivoa i energije
Te~enje podprit iskom
Dos t ignut ulaz?
Dodat i gubit ke na ulazu
Prora~un kot eenergije i nivoauzvodno od propus t ajed. (3 .8 /3 .11)
h=hkr nauzvodnom profilu
Kont rolni pesak je uzvodni
h > hkr
Ne
Prora~un uzvodnog nivoa jed.(3 .5 )
P rora~un uzvodnog nivoa jed.(3 .4 )
Te~enje u punoj cevi Ne
Prora~un nivoa i polo`aj hidrauli~kog skoka
Te~enje pod prit iskom
Da
Slika3.20
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Slika3.22
(c)
(a)
(d)
(b)pos t oje}i put
dogradnja
mogu}a pojava hidrauli~kog s koka
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Slika 3.20