OBRAS HIDRAULICAS INGº CIVIL UPT Bocatomas/Bocatoma La Tranca
BOCATOMA ITE
PATRICIA A. COSSI A.
T
junio del 2012
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DISEÑO DE BARRAJE DE UNA BOCATOMA DATOS PARA EL DISEÑO: Caudal de dis eño
Q(m3/s )
155 Q, Q,S,N c alc ulados prev iamente
Pendiente de r io
S
0,04 L= L= Calc ulado de ac uerdo a anc ho del c aus e 2/3 B
Coef ic iente de r ugos idad del r io
N
Longitud del bar raje
L(m)
Altura de Barraje
P(m) (m)
1. CARGAS HIDRAULICAS SOBRE EL BARRAJE A) CALCUL O DE CARGAS SOBRE EL VERTEDERO VERTEDERO ( He) Esquema:
0,053 P= altura de v entana + altura p' ev itar que ingr es a mater ial de ar ras t 35 (>=0.60m) + h par a c or regir ef ec tos de oleaje ( >=0.20m) 1,4
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Datos: Caudal de Dis eño
Q( m3/s )
Coef ic iente de Wes
C
Longitud de Bar r aje
L( m)
Res ultados : Car ga s obr e el bar r aje
155 El c oef ic iente C s e ha as umido p' poder es timar He 2,12 35 V . Calc ulado
He ( m)
V . Def inido 1,64
1,634
DETERMI DETERMINACI NACION ON DEL DEL COEFICIENTE "C"
Formulas C = Co*K1*K2*K3*K4
Datos: Altura de Barraje Barraje
P(m)
1,4
Car ga s obr e el bar r aje
He( m)
1,65
Car ga de c audal max imo
Ho( m)
1,65
Res ultados i) Coef ic iente por altur ade bar r aje
V . Calc ulado Co
V . Def inido 2,14
Ho = He
P/Ho = 0,848
Entonces con este dato de la figura A se obtiene Co ii) Cor r ec c ion por dif er enc ia de c ar gas
K1
1,00
Ho = He
Ho / He = 1, 1,00
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B) CALCULO DEL T IRANTE (Y)
Datos Caudal de diseño Altura de de barraje barraje Carga sobre el barraje Longitud de barraje Aceleracion Aceleracion de la gravedad gravedad
Q(m3/s)
155,00
P(m) (m)
1,40
He(m)
1,63
L(m)
35,00
g(m/s2) g(m/s2)
9,81
Reemplazando los datos se tiene el siguiente polinomio
3 24034,50
2
Y
-72923,67
Y
+
24025 = 0 y3
Resultados
V calculado
V def inido
El valor del tirante
Y (m)
2,92
2,95 Ca Calcular el valor de Y con calculadora
Calculo de carga neta
Hd (m)
1 52
1 50
y2
9,026734283
4,33531281
75168 87631
2 0821414
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2. FORMA DEL PERFIL DE LA CRESTA DE BARRAJE A.- LA PRIM ERA PARTE: DOS ARCOS Consiste en calcular los valores del tramo A-B
Formulas: R1 = 0.2 Hd R2 = 0.5 Hd X1 = 0.175 Hd X2 = 0.282 Hd D = 0.126 Hd
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B.- SEGUNDA PARTE: CRESTA Y ARCO DE TRANSICION Esquema
Formulas
Datos Constante de la ecuac ion Exponente de la abcisa Carga neta sobre el barraje Angulo Angulo de tangente tangente con la la horizonta horizontall
K n Hd (m) α
2,00 El El valor tomado es para barraje vertical 1,85 El valor tomado es para barraje vertical 1,50 60,00 el angulo de tangencia tangencia se toma toma entre 45º a 70º
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coordenada Y del punto de tangencia Radio de curva tr transicion al colchon disipador
Y o (m)
2,938
R (m)
4,500 0,85 Y
=
0,655
X
= tang (α )
0,85 Coordenadas
0,65 0,655 5
X
X
Y
0,000
0,000
Xo (m)
3,138
0,100
0,005
Y o (m)
2,938
0,200
0,018
0,300
0,038
0,400
0,065
0,500
0,098
0,600
0,138
0,700
0,183
= 1,732
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3.- CALCULO CAL CULO DE LOS TIRANTE TI RANTES S CONJUGADOS CONJUGADOS Esquema Esquema General Gener al
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B) CALCULO DEL TIRANTE CONJUGADO d2: Formulas Simplificacion de la formula de Bernouli
Ayuda 0,253 0,253 d1/2 d1/2 0,064 (d1^ (d1^2)/4 7,908 2*(V1^ 2*(V1^2)*d1/g 2)*d1/g 2,823
Datos: Tirante contraido al pie del vertedero V elocidad en el pie del vertedero Aceleracion Aceleracion de de la Gravedad Gravedad
d1 (m)
0,51
V 1 (m/s)
8,76
g(m/s2) g(m/s2)
9,81
d2 (m)
2,571
Resultados Tirante conjugado d2
2,57 Redondeado valor de d2
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D) CALCULO DE PERDIDA DE CARGA CARGA (Hj ) Formulas
Datos: Tir ante c ontr aido al pie del v er teder o
d1 ( m)
0,510
Tir ante c onjugado
d2 ( m)
2,570
Hj
- 1,667
Resultados Per dida de c ar ga ( ener gia liber ada en el s alto hidraulic o
4.- ANCHO DEL BARRAJE Y LONGITUD DEL COLCHON DISIPADOR Esquema Gener al
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Resultados Longitud transversal del barraje
Lb (m)
7,458
B) CALCULO DE LONGITUD DE COLCHON DISCIPADOR (Lc)
Formulas Utiliza las formulas empiricas y experimentales que orientan para la toma de decisión Lc1 = 5 (d2 - d1)
Formulas según el criterio de Schoklisch
Lc2 = 6 (d2 - d1)
Formulas según el criterio de Linquist
Lc3 = 6 d1 (V1/(g d1)^1/2)
Fomulas según el criterio de Safranez
Lc4 = 5 d2
Fomulas según el criterio de Burean of Redamation
Lc5 = 2.5 (1.9 d2 d1)
Fomulas según el criterio de Paulaski
7,46
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B.- CALCULO DE SUBPRESIONES EN LOS DIFERENTES PUNTOS DEL CASO B Formulas
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