dhaal

dhaal

jab kabhi kisi sadak mein mod aata hai to us modpar sadak ke farsh ko mod ke baahari or ooaincha uthaakar sadak ko dhaaloo banaaya hai. isi prakaar rel ke maarg mein bhi mod baahari patari bheetari se thodi uainchi rakhi jaati hai. sadak ki satah ka, ya rel ke maarg ka, mod par is prakaar dhaaloo banaaya jaana dhaal ya aanati (kaint ya super-ailiveshan) kahalaata hai.

mod par chalti hui gaadi par jo bal kaam karte hain ve

  • (1) apakeindr bal (seintrifugal fors) jiska baahar ki or kshaitij tatha traijya prabhaav padta hai,
  • (2) gaadi ka bhaar, jo oordhvaadhar neeche ki or kaarya karta hai aur
  • (3) sadak ke farsh ki pratikriya jo oopar ki or kaam karti hai.

apakeindr bal ka santulan sadak ki satah ka gharshan karta hai aur yadi is gharshan ka bal yathesht na ho to gaadi baahar ki or fisl jaaegi. uthaan is fislane ki pravrutti ko rokane mein sahaayata karti hai.

uthaan ka prayog rel ke maargon par deerghakaal se kiya ja raha hai, kintu jahaaain tak sadkon ka prashn hai, pehle gaadiyon ki mand gati ke kaaran iski aavashyakta naheen padti thi. aajkal motor gaadiyon ki teevr gati ke kaaran sadak ki uthaan ek aadhunik vikaas hai.

aavashyak dhaal us mahattam gati par nirbhar rahati hai jispar gaadiyon ke chalne ki aasha ki jaati hai, arthaat unke kalpit veg par. dhaal nimnalikhit sootr ke anusaar nishchit ki jaati hai :

q = V2/ (15 r).

yahaaain q = dhaal,

(V) = adhiktam kalpit veg (meal prati ghanta) aur

r = mod ki trijya (foot mein)

sahi uthaanavaali sadak par kalpit gati se yaatra karanevaali gaadi sugamata se tatha surakshit dhang par, fislane ki pravrutti ke bina, chalegi. yadi koi motarakaar sadak par kalpit gati se tej chalegi to sadak ka gharshan use fislane se bachaaega. yadi koi relagaadi kalpit gati se tej chalti hai to bagal ki daab ko pahiyon ke baahar nikle paarshv (flainjeinj) sainbhaal lete hain. uthaanavaala koi bhi mod keval us gati se yaatra karne ke liye sukhad hota hai jiske liye sadak banaai jaati hai. kintu sadak par to anek prakaar ki gaadiyaaain, teevr tatha dheemi donon prakaar ki gatiyon se chalti hain. dheemi chaal se chalanevaali gaadiyon ko, jaise bailagaadiyon aur anya jaanvaron se kheenchi jaanevaali savaariyon ko, jo kalpit gati se kaheen kam gati par chalti hain, adhik dhaal se asuvidha hoti hai. is kaaran Bhaarat mein bhaarateeya sadak Congress ke maanakon ke anusaar dhaal ki seema 15 mein 1 (arthaat 15 foot chaudi mein 1 foot) niyat kar di gayi hai. doosare deshon mein yadyapi 10 mein 1 tak ki dhaal ki anumati hoti hai, to bhi saadhaaranat: dhaal 15 mein 1 se adhik naheen hoti.

inhein bhi dekhein