btl cap thoat nuoc

8/12/2019 BTL Cap Thoat Nuoc

1/21

Trng i hc M Tp.HCM

Khoa Xy dng & in

BI TP L N

CP THOT N C

- Sinh vin: L Vn Hi

- MSSv 1051020087

- Nhm: XD03

- Ch k:

M : 25

- Bi tp 1: S 5; S liu 5g- Bi tp 2: S 8; S liu 8d

- Bi tp 3: S 2; S liu 2i

- Bi tp 4

S liuX Y Z A B DI RNG

3 14 200 1 2 12 10


2/21

2Bi Tp Ln C p Thot Nc

GVHD: THS. BI ANH KIT | SVTH: L VNI

M L

Bi tp 1: C p nc Mng li ct ........................................................................................................ 3

S 5: ................................................................................................................................................. 3

Bi lm:.................................................................................................................................................. 3

Bi tp 2: C p nc Mng li vng...................................................................................................... 8

S 8: ................................................................................................................................................. 8

Bi lm:.................................................................................................................................................. 8

Bi tp 3: Mng li thot nc ma .................................................................................................... 15

S 2: ............................................................................................................................................... 15

Bi lm:................................................................................................................................................ 16

Bi tp 4: ................................................................................................................................................. 18

: ....................................................................................................................................................... 18

Bi lm:................................................................................................................................................ 19


3/21



Bi tp 1: C p nc Mng li ct

S 5:

1 4 5 m

260m 165m 220m

252m 256m 305m

2 5 3 m

2 6 5 m

1 4 0 m

1 6 4 m

1 4 0 m

1

4 13

11

10 3 5 6

7

98212

q1=70 (l/s)

q2=13 (l/s)

q3=14 (l/s)

q4=8 (l/s)

q5=12 (l/s)

Mng li c p nc s dng loi ng thp c Chw = 135; Khu vc c qui hoch xy dng

vi chi u cao t i a l 3 tng; cao san n n b ng nhau ti mi im.T n th t p lc trong ng ng tun theo quy lut hazen Williams.

Xc nh ng knh ng v p lc c n thi t ti im u mng li.

Bi lm:

- Xc nh lu lng nc tnh ton cho tng on ng: Lu lng n v :

70 47164 140 253 256 305


4/21



0.00897 (l/s.m) Lu l ng d c ng ca t ng on ng : (l/s)

Q dd 1-2 = 0.00897164 = 1.47 (l/s) Q dd 6-7 = 0.00897140 = 1.26 (l/s) Q dd 2-3 = 0.00897140 = 1.26 (l/s) Q dd 2-8 = 0.00897165 = 1.48 (l/s) Q dd 3-4 = 0.00897253 = 2.27 (l/s) Q dd 8-9 = 0.00897220 = 1.97 (l/s) Q dd 3-5 = 0.00897256 = 2.30 (l/s) Q dd 5-6 = 0.00897305 = 2.74 (l/s) Q dd 3-10 = 0.00897252 = 2.26 (l/s) Q dd 5-13 = 0.00897265 = 2.38 (l/s) Q dd 10-11 = 0.00897145 = 1.30 (l/s)

Chuy n lu l ng d c ng v lu l ng nt: qnt = (l/s)qnt 1 qnt 2 qnt 3 qnt 4 qnt 5 qnt 60.74 3.26 4.05 1.14 3.70 2.00qnt 7 qnt 8 qnt 9 qnt 10 qnt 11 qnt 12 qnt 130.63 1.73 0.98 1.78 0.65 1.16 1.19

Lu l ng tnh ton c a t ng on ng (l/s):Q 6-7 Q 5-6 Q 5-13 Q 3-5 Q 3-4 Q 10-110.63 16.63 1.19 21.52 9.14 0.65Q 3-10 Q 2-3 Q 8-9 Q 2-8 Q 2-12 Q 1-214.43 49.14 0.98 15.71 1.16 69.27


5/21



- Chn tuy n b t li nh t: Tuy n 7-6-5-3-2-1 (l tuy n c chi u di ln nh t 1005m)

- Lp bng tnh thy lc cho tuy n b t li: Chn ng knh ng:

Vi on ng 1-2 c chi u di L =164 (m) v qtt = 69.27 (l/s) = 69.27 10-3 (m3/s)

ng knh ng: . vi V l vn t c kinh t chn l 0.7 (m/s) 4 . 469.27100.7 0.355355

Chn ng knh ng D = 350 (mm)

Vi DChn = 350 (mm) ta tnh li vn t c trong ng ng ki m tra:

4 469.2710 35010 0.72 /Tha iu kin vn t c dng chy trong ng350: 0.47 < 0.72 < 1.58 (m/s) Tnh t n th t p l c:

Chw = 135; theo Hazen william ta c:

10.67. . . 10.67164135. 35010 . 69.2710

.0.24

Tnh tng t cho cc on ng khc ta c bng sau:

on ng L (m) qtt (l/s) Dtt (mm) DChn (mm) V (m/s) hw (m)6-7 140 0.63 34 40 0.50 1.295-6 305 16.63 174 150 0.94 1.933-5 256 21.52 198 200 0.69 0.642-3 140 49.14 299 300 0.70 0.221-2 164 69.27 355 350 0.72 0.23 4.32 m

- Xc nh p lc yu c u ti im u mng li:Ta c: 18 4.32 22.32

- Tnh ton ng thy lc cho cc tuy n ng cn li:

Tuy n 5-13:

21.23 18 3.23


6/21



Bng tnh thy lc cho tuy n nhnh 5-13:

on ng L (m) qtt (l/s) Dtt (mm) DChn (mm) V (m/s) hw (m)

5-13 265 1.19 47 50 0.61 2.67

2.67 m

Nhn th y 2.67< 3.23 ng knh ng chn l hp l. Tuy n 3-4:

21.87 18 3.87 Bng tnh thy lc cho tuy n nhnh 3-4:


3-4253 9.14 129 150 0.52 0.53 0.53 m


21.87 18 3.87 Bng tnh thy lc cho tuy n nhnh 3-11:


3-10 252 14.43 162 150 0.82 1.2310-11 145 0.65 34 40 0.52 1.42

2.65 mNhn th y 2.65< 3.87

ng knh ng chn l hp l. Tuy n 2-12:

22.09 18 4.09 Bng tnh thy lc cho tuy n nhnh 2-12:on ng L (m) qtt (l/s) Dtt (mm) DChn (mm) V (m/s) hw (m)

2-12 260 1.17 46 50 0.60 2.54

2.54 m


7/21




22.09 18 4.09

Bng tnh thy lc cho tuy n nhnh 2-9:


2-8 165 15.71 169 150 0.89 0.948-9 220 0.98 42 50 0.50 1.55

2.49 mNhn th y 2.49< 4.09

ng knh ng chn l hp l.K t lu n:

- p lc c n thi t ti im u mng li l 22.32m

- ng knh ng chn: on ng 1-2 chn ng knh D = 350mm. on ng 2-3 chn ng knh D = 300mm. on ng 3-4 chn ng knh D = 150mm. on ng 3-5 chn ng knh D = 200mm.

on ng 5-6 chn ng knh D = 150mm. on ng 5-13 chn ng knh D = 50mm. on ng 6-7 chn ng knh D = 40mm. on ng 2-8 chn ng knh D = 150mm. on ng 8-9 chn ng knh D = 50mm. on ng 2-12 chn ng knh D = 50mm. on ng 3-10 chn ng knh D = 150mm. on ng 10-11 chn ng knh D = 40mm.


8/21



Bi tp 2: C p nc Mng li vngS 8:

1

6

5

4

32

q1=150 (l/s)q3=85 (l/s)

q2=65 (l/s) 3 0 2 m

2 2 5 m

4 0 8 m

2 2 5 m 1 5 2 m

225 m 2 2 5 m

2 0 0 m

Hy xc nh lu lng trong tng on ng, bi t:

ng c p nc b ng thp c Chw = 145.

ng knh cc on ng D = 300mm cho t t c cc s . Trong qu trnh tnh ton, sinh

vin c n iu chnh ng knh ng cho ph hp vi vn t c kinh t .

T n th t p lc trong ng ng tun theo quy lut Hazen Williams.

Sai s lu lng hiu chnh khng vt qu 0.25 (l/s).

Bi lm:

- nh s th t s nt, s on ng, s vng

- Gi thi t lu lng v chi u dng chy trong m i on ng sao cho t ng qnt = 0.- Quy c chi u dng cho mi vng.

1

6

5

4

32

q1=150 (l/s)q3=85 (l/s)

q2=65 (l/s)

+ [1] +

+

[2]

[3]

50 (l/s)5 0 ( l / s ) 50

(l/s)

50 (l/s) 4 0 ( l/ s )

3 5 ( l / s )

5 ( l / s )

1 0

( l / s

)

- Lp li l n 1, vng 1:


9/21



Tnh t n th t ct n c v t s trn t ng on ng:

on ng 1-2:

Ta c: D1-2 = 300 (mm) = 0.3 (m) ; Q 1-2 = -50 (l/s) = -0.05 (m3/s)

4| | 40.050.30.84 / t iu kin vn t c kinh t vi 300 0.4 t: 10.67. . 10.67. . 10.67302145.0.3. 112.79 Vy:

. 112.790.05. 0.439 0.4390.058.78

on ng 2-3:

Ta c: D2-3 = 300 (mm) = 0.3 (m) ; Q 2-3 = -50 (l/s) = -0.05 (m3/s)

4| | 40.050.30.84 /

t iu kin vn t c kinh t vi 300 0.4 10.67. . 10.67225145.0.3. 84.03

Vy:

. 84.030.05. 0.327 0.3270.056.54


10/21



on ng 3-4:

Ta c: D3-4 = 300 (mm) = 0.3 (m) ; Q 3-4 = -10 (l/s) = -0.01 (m3/s)

4| |

40.010.3

0.38 / Khng t iu kin vn t c kinh t vi 300 0

Chn li ng knh ng: D3-4 = 250 (mm) = 0.25 (m)

4| | 40.010.250.45 / t iu kin vn t c kinh t vi 250 0.3

10.67. . 10.67152145.0.25. 137.97 Vy:

. 137.970.01. 0.027 0.0270.012.7

on ng 1-4:

Ta c: D1-4 = 300 (mm) = 0.3 (m) ; Q 1-4 = 50 (l/s) = 0.05 (m3/s)

4| | 40.050.30.84 / t iu kin vn t c kinh t vi 300 0.4

10.67. . 10.67225145.0.3. 84.03 Vy:

. 84.030.05. 0.327 0.3270.056.54


11/21



Tnh t ng t n th t ct n cv t ng t s trong vng 1: 0.439 0.327 0.027 0

(

) 8.78 6.54 2.7 6.54

Tnh lu lng iu ch nh Q:

1.852() 0.4661.85224.560.01025 / 10, iu ch nh lu l ng t ng on ng trong vng 1:

0.05 0.01025/ 0.05 0.01025/ 0.01 0.01025/

0.05 0.01025/ Bng tnh l p l n 1, vng 1:ng D (m) Dchn (m) Vchn (m/s) K Q (m3/s) h i (m) hi /Q i Q hc (m3/s)

1-2 0.3 0.3 0.84 112.79 -0.05 -0.439 8.78 -0.039752-3 0.3 0.3 0.84 84.03 -0.05 -0.327 6.54 -0.039753-4 0.3 0.25 0.45 137.97 -0.01 -0.027 2.7 0.000251-4 0.3 0.3 0.84 84.03 0.05 0.327 6.54 0.06025

T ng -0.466 24.56

Q =0.01025- Lp li l n 1, vng 2:

Tnhton tng t vng 1 ta cng lp c bng sau: Bng tnh l p l n 1, vng 2:

ng D (m) Dchn (m) Vchn (m/s) K Q (m3/s) h i (m) hi /Q i Q hc (m3/s)

4-3 0.25 0.04 0.45 1038772.04 -0.00025 -0.222 888.00 0.000053-5 0.3 0.3 0.75 84.03 -0.04 -0.216 5.40 -0.039725-4 0.3 0.2 0.40 605.59 -0.005 -0.033 6.60 -0.00472

T ng -0.471 900.00

Q =0.00028


12/21



- Lp li l n 1, vng 3: Bng tnh l p l n 1, vng 3:


1-4 0.3 0.3 0.92 84.03 -0.06025 -0.462 7.67 -0.060454-5 0.2 0.2 0.39 605.59 0.00472 0.030 6.36 0.004525-6 0.3 0.3 0.70 74.69 -0.035 -0.150 4.29 -0.03526-1 0.3 0.3 0.84 152.37 0.05 0.593 11.86 0.0498

T ng 0.011 30.17

Q = -0.0002-

Lp l n 2- vng 1: Bng tnh l p l n 2, vng 1:


1-2 0.3 0.3 0.75 112.79 -0.03975 -0.287 7.22 -0.039732-3 0.3 0.3 0.75 84.03 -0.03975 -0.214 5.38 -0.039733-4 0.04 0.01 0.62 889517439.77 -0.00003 -3.739 124633.33 -0.000011-4 0.3 0.3 0.92 84.03 0.06045 0.465 7.69 0.06047

T ng -3.775 124653.63

Q = 0.00002- Lp li l n 2, vng 2:

Bng tnh l p l n 2, vng 2:

ng D (m)Dchn

(m)

Vchn

(m/s)K Q (m3/s) h i (m) hi /Q i Q hc (m3/s)

4-3 0.01 0.01 0.36 889517439.77 1E-05 0.489 48900.00 0.000023-5 0.3 0.3 0.75 84.03 -0.03972 -0.214 5.39 -0.039715-4 0.2 0.1 0.76 17721.21 -0.00452 -0.805 178.10 -0.00451

T ng -0.530 49083.49

Q = -0.00001


13/21




ng D (m)Dchn

(m)

Vchn


1-4 0.3 0.3 0.92 84.03 -0.06047 -0.465 7.69 -0.062544-5 0.1 0.1 0.76 17721.21 0.00451 0.802 177.83 0.002445-6 0.3 0.3 0.71 74.69 -0.0352 -0.152 4.32 -0.037276-1 0.3 0.3 0.84 152.37 0.0498 0.589 11.83 0.04773

T ng 0.774 201.66

Q =-0.00207- Lp l n 3- vng 1:



1-2 0.3 0.3 0.75 112.79 -0.03973 -0.287 7.22 -0.039722-3 0.3 0.3 0.75 84.03 -0.03973 -0.214 5.39 -0.039723-4 0.01 0.01 0.50 889517439.77 -0.00002 -1.765 88250.00 -0.000011-4 0.3 0.3 0.94 84.03 0.06254 0.495 7.91 0.06255

T ng -1.771 88270.53

Q = 0.00001- Lp li l n 3, vng 2:


ng D (m)Dchn

(m)

Vchn


4-3 0.01 0.01 0.36 889517439.77 0.00001 0.489 48900.00 0.000013-5 0.3 0.3 0.75 84.03 -0.03972 -0.214 5.39 -0.039725-4 0.2 0.1 0.56 17721.21 -0.00244 -0.257 105.33 -0.00244

T ng 0.018 49010.72

Q = 0.00000


14/21




ng D (m)Dchn

(m)

Vchn


1-4 0.3 0.3 0.94 84.03 -0.06255 -0.496 7.93 -0.063124-5 0.1 0.1 0.56 17721.21 0.00244 0.257 105.33 0.001875-6 0.3 0.3 0.73 74.69 -0.03727 -0.169 4.53 -0.037846-1 0.3 0.3 0.82 152.37 0.04773 0.545 11.42 0.04716

T ng 0.137 129.21

Q =-0.00057

K t lu n:

- Qua 3 vng lp ta th y lu lng iu chnhQ nh hn 0.25 l/s, tha mn yu c u bi.


15/21



Bi tp 3: Mng li thot nc ma S 2:

1 2 43

5

6

7

A = 9ha

C = 0.5

A = 7ha

C = 0.4

A = 10ha

C = 0.3

A = 13ha

C = 0.4

A = 12haC = 0.6

805m

415m 345m 305m

2 8 0 m

3 7 0 m

i=0.007 i=0.005 i=0.007

i=0.005

i = 0

. 0 0 7

i = 0

. 0 0 5

C ng thot nc s dng loi c ng trn b tng, c h s nhm n=0.012.

Thi gian nc trn v cc h ga te = 10 pht.

ng knh ng trn th trng; D=0.3m; 0.4m; 0.5m; 0.8m;1m; 1.2m; 1.5m; 1.8m; 2m.

Cng ma xc nh theo cng thc + . .Hy xc nh ng knh ng v thi gian tp trung nc ca mng li thot nc trn theophng php thch hp.


16/21



Bi lm:

- Xt on c ng 7-6: H ga u l 7, h ga cu i l 6. Chi u di on c ng: 805m.

d c:i=0.005.

Din tch b mt:

10 H s dng chy:

0.3

100.3 3=

Thi gian tp trung nc:

10 0 10 Cng ma I:

6520 36.7652010 36.7140 / Lu lng ma:

2.78100.314010 1.17 / > / 0.0121.17 0.0050.199 Tra bng ph lc 3 theo F(h/D) v iu kin v y h/d ta tm c ng knh ng

ph hp v din tch t A.

Chn c ng ng knh: D = 1m. C y d/D=0.68 v din tch t A = 0.565 (m2). Vn t c nc chy trong c ng:

1.170.5652.07 / Thi gian nc chy trong c ng tnh t ti u lu vc xa nh t n v tr thot nc chungca lu vc tf :

8052.07606.48 - Lm tng t cho cc on c ng cn li ta thu c bng sau:


17/21




18/21

Bi tp 4::

Thi t k h th ng c p v thot nc cho mt khu dn c c3 t ng ti Tp. HCM. Bi t:Chung c c thi t k dng hnh lang gia, cc cn h c b tr lin ti p, i xng nhau quahnh lang, ti m i t ng g m c 14 cn h.Chng loi v s lng cc thi t b dng nc trong cc cn h l nh nhau. Mi cn h g m c:1 vi t m hng sen, 2 bn c u loi 13 lt/ 1 l n x, 1 vi chu ra nh b p, 1 vi ra mt, 1 b nti u, 1 vi c p nc cho my git.Tiu chu n dng nc v tiu chu n thi nc l b ng nhau, b ng 200 (l/ ngi-ng). M i cn h c kch thc 12(m) x 10(m) (phng di dc theo hnh lang); chi u rng hnhlang 3m.Chi u cao t ng l 3,6m; ng nhnh b tr dc theo hnh lang; chi u di on ng l y nc votng cn h (l y t on ng nhnh) c chi u di trung bnh 10m.T n th t p lc trong ng ng c p nc sinh hot tun theo quy lu t Hazen Williams. ViCHW = 145.

Yu c u:1. C p nc sinh hot:- Xc nh lu lng tnh ton v kch thc cc ng ng ng v ng nhnh.- Tnh t n th t p lc ca tuy n ng chnh.2. Thot nc thi sinh hot: xc nh ng ng ng v ng nhnh thot nc.3. Thot nc ma: tnh ton s lng ng ng c n thi t.

AB

C

D

E

A'


19/21




20/21




21/21


2. Thot n c thi sinh ho t:

on ng T ng ng lng ng knh ng nc thi (mm)

A-A

20.17

50

A-B 282.38 125

B-C 282.38 125

C-D 564.76 125

D-E 1129.52 155

3. Thot ma trn mi:

M 21932 0.04960 = 191.7 (l/s)

v i Chn ng knh ng ng l 100mm. S lng ng ng: .10

btl cap thoat nuoc

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