Nota 10 pentru cine stie asta!

Din ce motiv capacele de canalizare de pe strada au forma rotunda?

din ce motiv o fi plin jumate din forumul asta de thread-uri inutile?

ptr ca aceasta forma geometrica are cea mai mare rezistenta la presiune,la factori externi etc.

Edited by GaiusBaltar, 27 February 2008 - 18:35.

dar oricum nu poti generaliza asa ceva fiindca am vazut sute de canale cu capace patrate.

godzila, on Feb 27 2008, 18:21, said:

Pentru ca se vand mai greu.

don_dannielo, on Feb 27 2008, 18:42, said:

in caz ca se fura?

Si eu ma gandesc ca pentru rezistenta. Capace de alte forme nu prea cred ca am vazut pe strada. Mai mult pe trotuare... . Si de asemenea datorita formei rotunde pot fi mai usor de transportat, prin rostogolire, fie de catre instalatori fie de catre hoti  

Edit:
Si iata ce spune wikipedia :

The question of why manhole covers are typically round, at least in the U.S., was made famous by Microsoft when they began asking it as a job-interview question.[4] Originally meant as a psychological assessment of how one approaches a question with more than one "right" answer, the problem has produced a number of find alternate explanations, from the pragmatic and satirical ("Manhole covers are round because manholes are round.")[4] to the philosophical.

Reasons for the shape include:

    * A round manhole cover cannot fall through its circular opening, whereas a square manhole cover may fall in if it were inserted diagonally in the aperture (A Reuleaux triangle or other curve of constant width would also serve this purpose, but round covers are much easier to manufacture.)
    * Round tubes are the strongest and most material-efficient shape against the compression of the earth around them, and so it is natural that the cover of a round tube assume a circular shape.
    * The bearing surfaces of manhole frames and covers are machined to assure flatness and prevent them from becoming dislodged by traffic. Round castings are much easier to machine using horizontal boring mills.
    * Circular covers do not need to be rotated to align them when covering a circular manhole.
    * Human beings have a roughly circular cross-section.
    * A round manhole cover can be more easily moved by being rolled.
    * If an automobile rolls over a dislodged manhole of another shape, the sharp corners could puncture the automobile's tire, whereas a circle doesn't have corners.
    * It's easier to dig a circular hole.
    * Tradition
    * Aesthetics

Other manhole shapes can be found, usually squares or rectangles. Nashua, New Hampshire may be unique in the U.S. for having triangular manhole covers that point in the direction of the underlying flow. The city is phasing out the triangles, which were made by a local foundry, because they are not large enough to meet modern safety standards, and larger triangles cannot be found. [1]

Edited by mc_h, 27 February 2008 - 18:57.

mc_h, on Feb 27 2008, 18:51, said:

Intradevar........cele rotunde nu pot sa cada in gaura pe care o acopera.............

godzila, on Feb 27 2008, 18:21, said:

Probabil ca se obtin prin turnare mai usor decat capacele cu colturi.
Probabil fiindca se folosesc la acces in gauri care sunt circulare default, prin constructie, si prin cele cunoscute din rezistanta materialelor.

Ai gasit raspunsul la intrebarea ta de nota 10?

Daca da...iti pun o intrebare noua: de ce SUPORTUL de la capacele de canalizare au intotdeauna o forma rectangulara?

?

Pentru ca nu exista alte poligoane convexe cu colturi de 90°.

gabicen, on Mar 7 2008, 00:17, said:

Hm... ce chestie, chiar intotdeauna?

[ http://www.bizoo.ro/img/Capac-De-Canalizare-Clasa-D400/img180/sale/21737_1166198964.jpg - Pentru incarcare in pagina (embed) Click aici ] [ http://www.valrom.ro/library/gaskit/capac%20canal%20carosabil.jpg - Pentru incarcare in pagina (embed) Click aici ] [ http://www.valrom.ro/library/gaskit/capac%20canal%20carosabil%20cu%20rama%20si%20inchizator.jpg - Pentru incarcare in pagina (embed) Click aici ]

Edited by Berti, 08 March 2008 - 13:43.

E vorba de placa din beton, nu de rama capacului. Pesemne pentru ca sunt mai usor de turnat si nici nu tre sa le standardizeze in functie de diametru.

Edited by abancor, 08 March 2008 - 14:03.

Berti: Daca e vorba gulerul inelului cu falt, atunci ai dreptate. Doar ca pe mine m-a dus mintea direct la capacul de camin.
(care din moment ce e planseu prefabricat din beton armat, e clar ca are forma rectangulara)

Edited by NightShift, 08 March 2008 - 14:10.

Am si eu in curte 2 capace de canalizare, unul patrat din beton si altul rotund din fonta (ala patrat e pe canalul ce face jonctiunea cu vecinul). Ala patrat e un chin sa-l scoti si sa-l pui la loc, daca nu-l potrivesti ca lumea o iei de la inceput. Ala rotund e joaca de copii, il trag cu o teava agatata in gaura din mijloc afara si apoi il pun inapoi impingandu-l cu picoiorul.

Ok, asteptam sa vedem la ce suport s-o gandit Gabicen... da' alea de beton, nu prea le vezi daca-i soseaua asfaltata.

Dar cum o fi cu distributia fortelor in cazul in care capacul este supus unei sarcini, trece o masina peste el etc?
Probabil ca mai e rotund si pentru ca oamenii au inventat...roata . E mai usor de manipulat.

Nu fratilor...... toata chestia este ca cele rotunde nu pot sa cada in gaura pe care o acopera (tot rotunda), indiferent ce ai face........

godzila, on Mar 10 2008, 18:49, said:

O simpla balama rezolva problema, indiferent de forma capacului.
Ce-i drept, argumentul cu picatul in gura de canal s-a mai dat deja...