산림기사 필답 기출문제 임도공학 계산문제 모음 설명포함 임투수의 산림기사

Hello. I'm Lim Tu-su, a forestry engineer. I've compiled a forest road engineering calculation problem. Question: IP is a point 80 meters away and 45 degrees from BC, and EC is a point 80 meters away and 120 degrees from IP. Find the tangent line, external line, and curve length. (Forest road width: 40 meters, radius: 40 meters, rounded to the nearest three decimal places.) The problem may be unfamiliar to those studying without a textbook. This problem can be solved by accurately understanding the azimuth of point BC. The azimuth is the angle from north, N. Question: Given an area of ​​10,000 ha and a forest road density of 10 m/ha, find the total length of the forest road. Forest road density = total length / area Total length = forest road density x area Photo shows a forest road extending into the air with a forest below. Question) A forest with an area of ​​300 ha has 500 m of branch roads and 10 km of main roads. Calculate how much additional roads must be built to achieve a forest road density of 40 m/ha. Forest road density 40 = total length (500 m + 10,000 m + x) / area 300 ha Question) If the forest area is 100 ha, the total length of the forest road is 2 km, and the forest road efficiency is 10, find the average logging distance. Forest Road Density = Forest Road Efficiency / Average Stacking Distance (km) = Total Length / Area Photo of trucks flying in the air / Photo of timber stacked every 500 meters Question) Calculate the average stacking distance in a hilly area with a density of 10 m/ha and a forest road efficiency factor of 8. Forest Road Density = Forest Road Efficiency / Average Stacking Distance 10 = 8/X X = 8/10 X = 0.8 Correct Answer: 0.8 km The unit here is km because the forest road efficiency factor uses km as the unit. Hills - Gently undulating terrain with elevations ranging from 200 to 600 meters above sea level. Characteristics intermediate between plains and mountains. Question) A forest road network is planned for an area of ​​2,000 ha with a forest road density of 10 m/ha. Calculate the following: (Note: The correction factor is set to 1.) Extension distance, forest road spacing, collection distance, average collection distance Answer) Forest road density 10 = total length / area 2000 10*2000 = total length 20,000 Total length = 20,000 The value is derived by dividing each forest road spacing of 10,000, collection distance of 5,000, and average collection distance of 2,500 by the forest road density. Question) Calculate the forest road spacing and forest road development index for a forest with a forest road density of 25 m/ha. Answer) The forest road spacing is 10,000 divided by the forest road density, i.e., 10,000/25 = 400 m. The forest road development index can only be calculated using the average collection distance, so: 2,500/25 = average collection distance = 100. Forest road development index = average collection distance x (forest road density/2,500) 100 x (25/2,500) = 1. Correct answer: Forest road spacing of 400 m, forest road development index of 1. Question) What is the minimum curve radius when the design speed is 30 km/h, the friction coefficient is 0.15, and the outside slope is 3%? (Round to the nearest three decimal places) Taking bus number 127 around a curve at a square speed. Speed^2/[(127(Friction coefficient + slope)] 30^2/[127(0.15+0.03)]=39.37008 Answer: 39.37 m (Minimum curve radius in meters) Question: If the curve radius of a forest road is 30 m and the distance between the front and rear axles of the vehicle is 6.5 m, find the amount of widening at the curve. (Round to the nearest two decimal places) Widening = L^2/(2R) Question: Calculate the soil volume generated during forest road construction using the average cross-section method and Ricket's equation. (Where the cross-sectional areas of the two ends are A1 = 25 m^2, Am = 30 m^2, A2 = 35 m^2, and the distance between the ends is 25 m.) Average of the two cross-sections = ((25 + 35/2) x 25 = 375 m^3 Rieke's formula (footnote formula) = (25/6) x (25 + 4 x 30 + 35) = 750 m^3 #Forest Engineer#Forest Engineer Study#Forest Engineer Written Exam#Forest Engineer Practical Exam#Forest Engineer 1st Exam#Forest Engineer 2nd Exam#Forest Engineer Study Method#Forest Engineer Outlook#Forest Engineer Memorization Easy#Forest Engineer Memorization Techniques#Forest Engineer Basics