Palkide koorimine survepesuriga
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Kuupäev
2016
Kättesaadav alates
Autorid
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Abstrakt
Kuuse- ja männipalkide koorimine on tööprotsess, mis tuleb läbida selleks, et palke oleks võimalik
kasutada ümarpalgist hoonete ehitusel. Uurimuse eesmärgiks oli võrrelda erinevaid töömeetodeid, et
leida optimaalne lahendus, mis oleks soodsaim arvestades tööjõu ja raha kulu. Võrreldavuse
saavutamiseks kasutati koorimisel kahte töövahendit – liimeister ja tööstuslik survepesur. Võrdluses
on 185 palki erineva pikkuse, koorepaksuse ja diameetriga. Töödeldavad palgid on pärit 140 aastasest
puistust ning seetõttu on nende koor paksem kui palkidel, mida tavaliselt majade ehitusel kasutatakse.
Uurimustöö objekt asub Nõo vallas Aarnamäe talu krundil, kuhu ladustatud 200 palki on lõigatud
Võnnu alevikus asuvalt 0,6 hektari suuruselt puistult 2015 aasta kevadel. Igal palgil on mõõdetud
mõlema otsa diameeter, koorepaksus ja palgi pikkus. Töö käigus mõõdeti iga palgi koorimiseks kuluv
aeg, vee- ja kütusekulu. Eraldi on välja toodud palkide liigutamiseks kuluv aeg. Antud uurimus toob
eriti hästi välja töö kiiruste erinevuse palkide tüveotstel, kus koore paksus ületab 40 mm. Tulemustest
selgus, et survepesuriga koorimisel kulus aega keskmiselt 3 korda vähem, kui liimeistriga. Eriti suur
vahe tuleb oksliku kuusepalgi koorimisel, kus liimeister kohati koort eemaldada ei suudagi.
Survepesuriga kulus küll aega veemahutite täitmisele ja masinate tankimisele, aga lõpptulemus näitab,
et maha arvestades lisanduvad rahalised kulutused on pesuriga töötades tootlikus tööpäeva lõikes 3
korda suurem. Uurimus on tehtud 2 kuu vältel, mis toob samuti välja tootlikkuse langemise koore
niiskusesisalduse langedes.
Debarking spruce and pine logs is a process that needs to be performed to prepare the material for subsequent use in constructing roundwood buildings. The objective of the present study was to compare different debarking methods to determine the optimal one in terms of labour and cost efficiency. The comparison involved two debarking tools – a drawknife and an industrial pressure washer – used on 185 logs differing in length, bark thickness and diameter. As the logs originated from a 140-year-old stand, their bark was considerably thicker than of those normally used in the construction of buildings. The site of the study was Aarnamäe farmland in Nõo Rural Municipality, on which the 185 logs cut from a 0.6-ha stand near Võnnu Village in spring 2015 were piled. Each log was measured for its length, bark thickness and diameter at either end. The amounts of water, fuel and time consumed during the debarking process were measured individually for each log. The time spent on turning the logs is presented as a separate item. The study demonstrated a huge difference in debarking speed at the bole side of the logs with a bark thickness of up to 40 mm. It appeared from the findings that the time of debarking with the pressure washer was approximately three times shorter as compared to the drawknife. The difference was particularly marked in the case of knotty spruce logs, where the drawknife occasionally proved ineffective. While the pressure washer required extra time for filling up the water and fuel tanks, it ultimately exhibited a threefold superior efficiency per workday notwithstanding the accompanying financial costs. The study was conducted over a two-month period, which provided additional information on loss of efficiency due to decreasing bark moisture levels.
Debarking spruce and pine logs is a process that needs to be performed to prepare the material for subsequent use in constructing roundwood buildings. The objective of the present study was to compare different debarking methods to determine the optimal one in terms of labour and cost efficiency. The comparison involved two debarking tools – a drawknife and an industrial pressure washer – used on 185 logs differing in length, bark thickness and diameter. As the logs originated from a 140-year-old stand, their bark was considerably thicker than of those normally used in the construction of buildings. The site of the study was Aarnamäe farmland in Nõo Rural Municipality, on which the 185 logs cut from a 0.6-ha stand near Võnnu Village in spring 2015 were piled. Each log was measured for its length, bark thickness and diameter at either end. The amounts of water, fuel and time consumed during the debarking process were measured individually for each log. The time spent on turning the logs is presented as a separate item. The study demonstrated a huge difference in debarking speed at the bole side of the logs with a bark thickness of up to 40 mm. It appeared from the findings that the time of debarking with the pressure washer was approximately three times shorter as compared to the drawknife. The difference was particularly marked in the case of knotty spruce logs, where the drawknife occasionally proved ineffective. While the pressure washer required extra time for filling up the water and fuel tanks, it ultimately exhibited a threefold superior efficiency per workday notwithstanding the accompanying financial costs. The study was conducted over a two-month period, which provided additional information on loss of efficiency due to decreasing bark moisture levels.
Kirjeldus
Märksõnad
palgid, surveseadmed, bakalaureusetööd