Domin sanin tsawon lokacin bushewar katakon katako dangane da dalilai daban-daban, ana ba da shawarar hanyar da aka haɓaka a Cibiyar Nazarin Kimiyya ta Tsakiya don sarrafa itacen injuna.

Hanyar tana tsinkayar ƙididdiga daga tebur1-8. Suna la’akari da nau’in itace, kauri, nisa da tsayin kayan, ingancin bushewarsa, gina na’urar bushewa, zafi na farko da na ƙarshe.

Ƙididdiga gwargwadon nau’i da girman itace

Table1- Coefficient bisa ga irin itace

Tebur1: Coefficient bisa ga irin itace
Wani nau'in itace Spruce, fir Bor Itacen Birch Itacen Beech Larch Oak
Coefficient 0 4 26 41 46 71

Table2- Coefficient bisa ga kauri abu

Tebur2: Coefficient bisa ga kauri abu
Kauri, mm 13 16 19 22 25 30 35 40 45 50 55 60
Coefficient 0 9 16 23 28 36 43 49 54 59 65 70
Kauri, mm 70 80 90 100 110 120 130 140 150 180 220 280
Coefficient 80 89 97 104 110 116 121 126 130 142 155 171

Table3- Coefficient bisa ga nisa na kayan

Tebur3: Coefficient bisa ga fadin abu
Rabon fadin abu zuwa kaurinsa W:D ku1,5 2 3 5 10
Coefficient 0 5 9 14 18

Table4- Coefficient bisa ga tsawon kayan

Tebur4: Coefficient bisa ga tsawon kayan
Tsawon, m 0,3 – 0,4 0,5 – 0,6 0,7 – 0,8 0,9 – 1,0 a kan1,0
Coefficient 0 6 11 14 15

Coefficients bisa ga ingancin bushewa da bushewa

Table5- Coefficient bisa ga ingancin bushewa na kayan

Tebur5: Coefficient bisa ga ingancin bushewa na kayan
Nau'in bushewa Bushewar katako na al'ada (jinin II) Bushewar katako mai inganci don kayan daki, yin kekunan keke... (Kashi na I) bushewa mai inganci don kera motoci, bakan gizo na itacen oak..
Coefficient 0 8 20

Table6- Coefficient bisa ga zane na bushewa

Tebur6: Coefficient bisa ga zane na bushewa
Nau'in asali SRC Tare da rikicewar wurare dabam dabam Tare da dabi'a ko raunin motsin tuki Ducts tare da wurare dabam dabam na halitta
Coefficient 0 4 8 15

An yi la’akari da kayan sharadi lokacin da ake ƙididdige ƙididdiga. Abubuwan da ake buƙata suna nufin allon katako mai kauri50 mm, fadin150 mmkuma tsayi ya wuce1 m, tare da zafi na farko60%kuma na karshe12%. Wannan abu, dage farawa a kan m gammaye25 mm, Ya kamata a bushe a cikin bushewa tare da yanayin yanayin iska a lokacin6kwanaki.

Yin amfani da ƙididdiga da aka bayar a cikin tebur1-8, ana iya ƙayyade kalmar al’ada don bushewa katakon katako.

Misalin lissafi

Wajibi ne don ƙayyade tsawon lokaci na bushewa na katako mai kauri na Pine40 mm, fadin20 mm(yawan fadin zuwa kauri200:40=5) kuma tsayi ya wuce1,0 m. An yi nufin allunan don samar da firam ɗin leaf ɗin kofa, watau ingancin bushewa shine nau’in I, kuma an bushe su a cikin injin bushewa tare da saurin jujjuyawar iska daga zafi na farko.60%zuwa matsanancin zafi9%.

Ma’auni masu dacewa sun ba da:

K = 4 + 49 + 14 + 15 + 8 + 0 + 82 = 172

Coefficients dangane da zafi da matakan bushewa

Table7- Coefficient bisa ga farkon da karshe zafi na sawn katako

Tebur7: Coefficient bisa ga farkon da zafi na ƙarshe na sawn katako
zafi na farko,% zafi na ƙarshe,%
6 7 8 9 10 11 12 13 14 15 18 20 22 25
20 62 56 50 45 38 32 25 18 9 0 / / / /
25 70 65 60 55 50 45 41 35 30 25 6 / / /
30 75 70 66 62 58 54 50 46 42 38 25 15 30 /
35 79 75 71 67 64 60 57 54 50 47 38 29 21 7
40 82 78 75 71 68 65 62 59 56 53 44 38 32 21
45 85 81 77 75 72 69 66 63 61 58 50 45 40 31
50 87 83 80 77 75 72 69 67 65 63 55 51 46 38
55 89 85 82 80 77 75 72 70 68 65 59 55 50 44
60 90 87 84 82 79 77 75 72 70 68 62 58 55 48
65 92 89 86 84 81 79 77 75 73 71 65 61 58 52
70 93 90 88 85 83 81 78 76 75 73 67 64 61 55
75 94 92 89 87 85 82 80 78 77 75 69 66 63 58
80 95 93 90 88 86 84 82 80 78 77 71 68 65 61
85 96 94 91 89 87 85 83 82 80 78 73 70 67 63
90 97 95 92 90 88 86 85 83 81 79 75 72 69 65
95 98 96 93 91 89 87 86 84 82 81 76 73 71 67
100 99 97 94 92 90 88 87 85 83 82 77 75 73 69
110 101 98 96 94 92 90 89 87 85 84 80 77 75 74
120 102 99 97 95 94 92 90 89 87 86 82 79 77 76
140 104 102 100 98 96 95 93 92 90 89 85 83 81 78

Table8- Coefficient don sake lissafin yanayin bushewa a cikin lokaci bisa ga raguwar zafi

Tebur8: Coefficient don sake lissafin yanayin bushewa a cikin lokaci bisa ga raguwar zafi
Asarar danshi na kayan abu, % 60-50 50-40 40-35 35-30 30-25
Matsakaicin matakin bushewa 0,11 0,14 0,08 0,10 0,11
Asarar danshi na kayan abu, % 25-20 20-15 15-12 12-10 10-8
Matsakaicin matakin bushewa 0,14 0,17 0,15 0,11 0,14

Maudu’ai masu alaƙa: softwood da katako na katako, busar da itace, zazzabi da zafi na iska yayin bushewar itace, samar da tagogi da kofofin katako da neman zance.