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1,11·<br />
10<br />
v =<br />
2<br />
π ⋅ r<br />
⎛<br />
⎜<br />
⎝<br />
1<br />
0,009<br />
r<br />
2<br />
⎞<br />
⎟<br />
⎠<br />
2<br />
3<br />
⋅r<br />
−3<br />
⋅ 0,005<br />
2<br />
1<br />
2<br />
2<br />
3<br />
⎛ r ⎞<br />
⋅⎜<br />
⎟<br />
⎝ 2 ⎠<br />
= 8,72⋅10<br />
-3<br />
⋅π<br />
⋅r<br />
⇒<br />
2<br />
= 1,11·<br />
10<br />
8/3 3 / 8<br />
-2<br />
3 / 8<br />
( r ) = ( 1,<br />
38 · 10 ) ⇒ r = 0,20 m = 200 mm<br />
r<br />
8/3<br />
-3<br />
= 8,<br />
72·<br />
10<br />
-3<br />
⇒<br />
⋅ 2<br />
2/3<br />
2<br />
⎛ r ⎞ 3<br />
2<br />
7 , 86 ⋅ ⋅r<br />
=<br />
⇒<br />
r<br />
⎜ ⎟<br />
⎝ 2 ⎠<br />
8/3<br />
Annexos Memòria<br />
= 1,<br />
38 · 10<br />
1,11·<br />
10<br />
Es busca el catàleg <strong>de</strong> tubs <strong>de</strong> drenatge comercials per <strong>de</strong>terminar el<br />
diàmetre <strong>de</strong>l tub que més s’aproximi a les necessitats <strong>de</strong>l projecte.<br />
Canonada <strong>de</strong> PVC corrugada <strong>de</strong> doble paret.<br />
Diàmetre exterior = 400 mm<br />
Diàmetre interior = 362 mm<br />
Comprovació <strong>de</strong> la velocitat <strong>de</strong> l’aigua:<br />
1,11·<br />
10<br />
v =<br />
2<br />
π<br />
⋅ r<br />
−3<br />
1,11·<br />
10<br />
=<br />
π · 0,20<br />
−3<br />
2<br />
=<br />
8,83 · 10<br />
-3<br />
m<br />
s<br />
-2<br />
-3<br />
42
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