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Dulgherie
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Dulgherie

dulgherieLemnul este alcatuit din mai multe tipuri de tesuturi vegetale: tesutul vascular, fibre, parenchimul de rezerva.

  • Fibre: fascicule de celule rezistente, dispuse intr-un sens axial, care asigura rigiditatea si rezistenta mecanica a lemnului. Sunt constituite dintr-un amestec de celuloza, hemiceluloza si lignina
  • Tesutul vascular: este compus din vase, celule tubulare prin care se conduce seva bruta de la radacini la frunze. La conifere aceste vase sunt numite traheide. Vasele conductoare sunt adesea asociate cu celulele parenchimatice (numite si parenchim), care contribuie la transportul de nutrienti in arbore
  • Celulele de rezerva parenchimatice, cu pereti ingrosati si lignificati, care insotesc tesutul vascular. Aceste celule participa la functia de sustinere. Orientarea lor este transversala si radiala pornind de la axa longitudinala a arborelui

Compoziția chimică

Lemnul consta in principal din substante organice, precum si din substante anorganice (1 pana la 1,5%). De asemenea, poate avea umiditate variabila.

  • Celuloza (40 - 50%)
  • Lignina (20 pana la 30%)
  • Hemiceluloza (15 la 25%)
  • Alte substante organice: polizaharide, pentozani, hexozani, rasini, taninuri, coloranti, ceara, alcaloizi
  • Apa

Exista trei tipuri de apa in lemn:

  • Apa libera este apa prezenta in lemnul verde
  • Apa legata este apa care intra in compozitia fibrelor. Ea este cea care cauzeaza contractii in timpul uscarii
  • Apa de compozitie este apa care intra in compozitia moleculelor. Eliminarea acesteia duce la distrugerea lemnului (de exemplu, in incendii)

Proprietăți chimice

Datorita porozitatii sale, lemnul este un conductor slab de caldura, prin urmare este foarte potrivit ca izolare termica. Molidul are o conductivitate termica de 0.22 W / mK (pentru comparatie betonul are 0,69 W / mK), iar placile izolatoare - 0.14 W / mK sau mai mica. Placile aglomerate poroase ajung la 0.05 W / mK. Conductibilitate termica creste cu continutul de umiditate si densitatea materialului.

Capacitatea termica este la lemn de aproximativ 4 ori mai mare decat la fier. Expansiunea termica poate fi neglijata in practica la lemn, deoarece aceasta va fi compensata de contractie la uscare.

Descompunere termica a lemnului incepe la temperaturi de peste 105 grade C; la 200 grade C este foarte mult accelerata si atinge cota maxima la 275 grade C. O degradare termica a lemnului poate sa apara in timpul expunerii prelungite la temperaturi mai mici de 100 grade C. Punctul de aprindere de lemn este intre 200 si 275 grade C. In absenta oxigenului duce la piroliza.

Utilizări

Lemnul este utilizat in scopuri multiple si, in mai multe forme: cea mai importanta utilizare la nivel mondial este cea de combustibil: lemnul ofera 3.5 Wh/kg (1 metru cub de lemn este egal cu 0,147 tone echivalent petrol = 1480 kWh).

Capacitatea termica este la lemn de aproximativ 4 ori mai mare decat la fier. Expansiunea termica poate fi neglijata in practica la lemn, deoarece aceasta va fi compensata de contractie la uscare.

Descompunere termica a lemnului incepe la temperaturi de peste 105 grade C; la 200 grade C este foarte mult accelerata si atinge cota maxima la 275 grade C. O degradare termica a lemnului poate sa apara in timpul expunerii prelungite la temperaturi mai mici de 100 grade C. Punctul de aprindere de lemn este intre 200 si 275 grade C. In absenta oxigenului duce la piroliza.

Arderea are loc in trei etape: in prima, lemnul este uscat la temperaturi de pana la 150 grade C, evaporand apa continuta. Apoi, intre 150 grade C si 600 grade C are loc piroliza. Componentele gazoase din lemn sunt apoi eliberate si este format carbune. In sfarsit, de la 400 la 1300 grade C, are loc oxidarea (arderea).

  • Lemnul este utilizat si in industrie, din acesta se foloseste in special celuloza si lignina: din lemn se face hartie (celuloza), placi aglomerate din lemn (PAL), placi din fibre de lemn (PFL) si alte sortimente de panouri prefabricate, lacuri si vopsele, lipici (lignina), diferite materiale sintetice, rasini, etc
  • Lemnul mai este folosit in arta, alimentatie
  • Lemnul mai este utilizat ca material de constructie: case de lemn, poduri, traverse de cale ferata, mobila, parchet, diferite elemente de design interior. La o casa cel mai important rol il are in realizarea acoperisului , element exitentiel pentru celelalte elemente ornamentale din interior

Acoperișul

Acoperisul cu pante este alcatuit din: sarpanta, invelitoarte si elemente auxiliare.

Sarpanta constituie elementul de rezistenta din lemn dar asigura in acelasi timp si o parte importanta a designului unei case si pot fi:

  1. din lemn
    1. pe scaune (sarpante dulgheresti)
      • Astereala - scandura de 2.5 cm si latime de 12-20 cm
      • Capriori - lemn ecarisat (68x68 mm, 96x96 mm sau lemn rotund cu diametrul de 10-12 cm la 70-90 cm unul de altul
      • Pane si cosoroabe - lemn ecarisat 10x12 cm sau 15x25 cm (la partea inferioara)
    2. cu ferme ( pentru deschideri mari), alcatuite din: Astearola,Capriori, Pane, Ferme
      • Astereala - scandura de 2.5 cm si latime de 12-20 cm
      • Pane si cosoroabe - lemn ecarisat 10x12 cm sau 15x25 cm (la partea inferioara)
      • Ferme din lemn - ecarisat 7x7cm pana la 15x25cm
  2. metalica
  3. din beton armat 

 

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Str. Dionisie Lupu, nr. 50, et. 3, ap.7, interfon 73C Bucuresti Sectorul 2 Romania

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