Izbira sekaške sekire glede na jakost tresenja in obremenitve ledvenega dela

Kocjančič, Luka (author), Poje, Anton (mentor)

V diplomski nalogi ugotavljamo vpliv vrste lesa ročaja sekire, njegove dolžine in mase glave na obremenitve sekača s tresenjem in obremenitve ledvenega dela hrbta. Raziskava je potekala v dveh delih, in sicer v obliki kontroliranega testa in sečnje v gozdu. V raziskavo smo vključili štiri sekire, ki so se razlikovale po dolžini (70 in 90 cm) in vrsti ročaja (jesen in bukev) ter masi glave (1,2 in 1,8 kg). Pri testu smo dodatno preverili vpliv vrste klina (plastičen, lesen in kovinski) na jakost tresenja sekire. Rezultati so pokazali, da na jakost tresenja vplivajo vsi preučevani dejavniki, in sicer so jakosti večje pri uporabi jesenovega ročaja, krajšega ročaja, težje glave sekire in pri uporabi kovinskega klina. Obremenitve ledvenega dela hrbta so nasprotno manjše pri sekirah z manjšo maso glave in krajšo dolžino ročaja. Kot optimalno sekiro za naganjanje predlagamo sekiro z bukovim ročajem ter lahko glavo, dolžina ročaja pa naj bo čim daljša, vendar skladna s sekačevimi antropometričnimi lastnostmi.

• Language: Slovenian
• Keywords: predsečnja, sekira, naganjanje, obremenitev s tresenjem, obremenitve ledvenega dela
• Work type: Bachelor thesis/paper
• Organization: BF - Biotechnical Faculty
• Year: 2018
• PID: 20.500.12556/RUL-103234
• COBISS.SI-ID: 5181606
• Publication date in RUL: 15.09.2018

Secondary language

• Language: English
• Title: Choosing a woodcutters axe according to the hand-arm vibrations and spinal loads

Abstract

In the graduation thesis the influence of the type of the axe’s handle, its length and the weight of the head on exposure to hand-arm vibration (HAV) and the load of lower back were examined. The research was carried out in two parts, in the form of a controlled test and logging in the forest. Four axes, varying in length (70 and 90 cm), in type of handle (ash and beech) and in weight of the head (1.2 and 1.8 kg) were included in the study. In addition, we examined the influence of the wedge type (plastic, wooden and metal) on exposure to HAV. The results showed that exposure to HAV are influenced by all factors studied. The HAV values are greater when using the ash handle, shorter handle, heavier head and when using a metal wedge. The lumbar spine loads are oppositely smaller when axes with lower head weight and shorter length of the handle were used. As an optimum axe, we recommend a beech handle with a lightweight head, the length of the handle should be as long as possible, but consistent with the cutter's anthropometric measures.

• Keywords: prefelling, axe, felling, vibration exposure, lower back strain