Question

A small hydraulic backhoe excavator will be used to dig a trench (see the figure below) in hard clay. The excavator has a bucket of 3/4 cu yd. The maximum digging depth of the excavator is 4 ft. The average swing angle is expected to be 90 ° Estimate the hourly trench production in linear feet ifjob efficiency is 70%. 1. 100 ft A2 2 ft 2 2 ft Ai 3 ft 2 2 ft

Answer 1

0 Suoing angle g Maximum diggng depth 4 ft whexe cNombe e cycle per hou s-su)ing depth bact。γ v= heaped bucket volume, 8 - Bucket bill bactor Cut (% 엇 maximum) = actual depth 100 o ptimurn depth For octal depth = dtda 3t, 2.5 ft 2. 62.5 %, 6001。 STEP2 (S) rom Table → 9o maximum Swing Angle go 12 0 45 60 5 1-33 126 2) S 128 121 1-16 110 1:16 1:10 1.0S o t od 1.03 6.9y 30 to 90

So Busing ongte 4 (ve get Stoing-depth acto ()10t 1o1os 2. S 1.05 Step 4→ For Small hydHaulíc excavator and hand Clay-p B 0.8 and it is given in phoblem that Steps-, The heaped Capacity 。

Ste26 → putting allvalues on egoanon④ production рен houH-CYSKVxBxE -905 12 Pt3h culation e houkly trench pexoduiction in ginease beet s Production foer 1905.12 1CFIh mean eret} 1905 i2 LCF1h houst in línear where A=Cross sectional area 엉 trench 2 Calculation Al→ 2. 3ft = 10.5 ft2 2, Calculation Gb A2→ 2. 1 2 2.

So 0 2. Px.oducion per houst in lin eo beet = 1905.12 LCFIh 230.9236 LFİh howdy trch Puoduom is 230.8236 LEİh e n