DONJI STROJ PUTA ZEMLJANI TRUP GORNJI STROJ: KOLOVOZNA KONSTRUKCIJA DONJI STROJ: ZEMLJANI TRUP Nasip Usek Zasek (tipičan i čist) Galerija OBJEKTI -
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MATERIJAL ZEMLJANOG TRUPA Mora biti mineralnog porekla (sastava). Delimo ga u tri osnovne grupe: Koherentni materijali Rastresiti ili zrnasti materijali Kamen - stene • •
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DONJI STROJ PUTA ZEMLJANI TRUP NEVEZANI MATERIJALI (PRIRODNI): Prašina 0,002 – 0,02 mm Pesak 0,02 – 2 mm Šljunak 2 – 60 mm Oblutci 60 – 200 mm Blokovi 200 – 2000 mm Pesak može biti prašinast, sitan, srednji, krupan. Šljunak može biti sitan, srednji, krupan. -
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UGAO UNUTRAŠNJEG TRENJA
VEZANA (KOHERENTNA) TLA: Preovlauje materijal mineralnog porekla, veoma sitnih zrna: Koloidi 0,00002 – 0,0002 mm Glina 0,0002 – 0,002 mm Nastali su hemijskim raspadanjem primarnih materijala mater ijala od kojih su -
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DONJI STROJ PUTA ZEMLJANI TRUP Svi materijali podeljeni su u tri osnovne grupe: • • • • • •
Peskovita tla Ilovača Glina
Materijali do 0,06 mm se prosejavaju, prose javaju, a ispod toga se vrši areometrisanje (merenje gustine suspenzije u odreenim vremenskim intervalima).
STENE ČVRSTE, MASIVNE, JEDRE I POSTOJANE STENE • •
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DONJI STROJ PUTA ZEMLJANI TRUP DEJSTVO MRAZA NA PUTEVE Dubina dejstva mraza zavisi od intenziteta, dužine trajanja mraza i prirode samog tla. Dejstvo mraza se deli na fazu zaleivanja i fazu odmrzavanja. Dejstvo je različito za zrnaste i koherentne materijale. -
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PRETHODNI RADOVI Raščišćavanje terena (drveće, šiblje, postojeći objekti). Uklanjanje humusnog sloja. -
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DONJI STROJ PUTA ZEMLJANI TRUP NASIP To je zemljani objekat koji se gradi nasipanjem zemlje i nabijanjem iste odgovaraju ćim mehaničkim oruima. Nasip se uvek izvršava u slojevima čija debljina zavisi od uslova sabijanja, vrste materijala i primenjene mehanizacije. Slojevi koji se nanose su horizontalni, uz neophodan nagib za odvodnjavanje. odvodnjavanje. Materijal ne sme da sadrži organske materije. Pre početka izrade nasipa treba izvesti propuste i zaštitne rigole ili jarkove. Zbijenost nasipa kontroliše se po završenoj izradi svakog sloja, uglavnom dvema metodama: 1. Proktorov opit se zasniva na utvrdjivanju utvrdjivanju zapreminske težine osušenog uzorka uzetog iz ugradjenog sloja nasipa. Uporedjujući ovu težinu težinu sa zapreminskom težinom istog materijala ugradjenog u laboratoriji po standardnom postupku dobija se predstava o zapremini šupljina odnosno zbijenosti ugradjenog sloja. 2. Opit kružnom pločom om je je druga metoda, kojom se vrši vrš i ispitivanje deformacija ugradjenog ugradjenog sloja na taj način što se s e u jednakim vremenskim intervalima utvrdjuje utvrdjuje prodiranje u ugradjeni ugradjeni sloj plo če odredjenog prečnika, pri odredjenim specifi čnim pritiscima, koji se pove ćavaju u odredjenim vremenskim intervalima. Na ovaj na čin dobija se tzv. modul stiš stišljivosti ugradjenog sloja. -
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DONJI STROJ PUTA ZEMLJANI TRUP
VALJCI
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DONJI STROJ PUTA ZEMLJANI TRUP
Na manjim površ površinama i u skučenom prostoru koriste se eksplozivni nabija či – žabe abe,, kod kojih usled eksplozije motora sa unutrašnjim sagorevanjem dolazi do skoka mašine.
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DONJI STROJ PUTA ZEMLJANI TRUP NASIP OD NEVEZANOG MATERIJALA Za sabijanje nasipa od ovog materijala primenjuju se vibraciona sredsvta: vibrosol, vibromaks, vibracioni valjak, vibracione plo če i grede, itd. Za sabijanje praš pra šinastih tla optimalno sredstvo je pneumatički valjak uz dodatnu primenu glatkog valjka i vibracionih ma šina. Optimalna debljina slojeva je od 20 do 50 cm kod šljunkovito Optimalna debljina
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DONJI STROJ PUTA ZEMLJANI TRUP USEK Usek je zemljani objekat izvrš izvr šen u zemlji iskopom is kopom prema odredjenom profilu. profilu. Svi materijali podeljeni su u sedam kategorija. kateg orija. Materijali od otkopavaju kategori ja. Materijali od I do IV kategorije kategorije otkopava otkopavajjuu se bez upotrebe eksploziva, dok materijali od V do VII kategorije zahtevaju zahtevaju primenu baruta ili eksploziva za ru šenje miniranjem. Ručni iskop kod savremenog gra enja puteva ne dolazi u obzir. Mehanizovani iskop zemlje I – IV kategorije izvodi se mašinama koje možemo da podelimo u dve grupe: • •
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