cee166-fa07-mt1-Horvath-soln

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Unformatted text preview: Do not write in this space CE 166 Construction Engineering Fall 2007 Exam 1 Name: Amna Wong: 1. (Equipment utilization) Suppose you are the earthwork contractor for a project. You have an excavator on site, and are planning to use it to load off- road haulers in order to mo've soil a distance of Jingles. Excavator specifications are: a ne ’ wmj o Bucket size: 1.7 yd3 = EXMMMU; 0- Standard cycle time: 22 sec ' o Efficiency factor adjustment for this site: 0.70 and 0.80 0 Operation time/day: 7 hours / Off-road hauler specifications are: 0 Capacity: 30 yd3 / 0 Average speed: 35 mph / / o Dumping time: 30 sec /’ i o Efficiency factor adjustment for this site: 0.70 and 0.75 ‘ ' 0 Operation time/day: 7 hours one ‘1 a) How many off-road haulers should you use in conjunction with the we excavators if your goal is to maximize daily productivity for the Operation? (16 points) —'€)<C6{'i/aTDK" Pcfl “MFA T 'l”; m, « “H i i a 22 see i \ , \f‘ffim i”~“"*‘:“”“‘VLW’ r «OHM-3 ‘jdfi/d"‘~% CmoXMW : IMO-57¢; 22396 Ag; 2:5 Mimi ’ 3,0003%?) cw Mules: PH: “T” Te 7 . i I M, 12h in + m - 22390 (flit, v (390239») + 32 sec-1:.103S. \thd a as” UM . 7.22696 2. (Economies of scale) What relationships exist between the scale of facilities (e.g., number of floors in a building, or number of seats in a theater) and the total cost of facilities? Please graph these relationships. What are their names? (5 points) (in V increasing ' Scalucvrm C(J,Fa§li\j‘gw. increasanY Yement 1‘9 DisQCMM%-/ scale % V er ' ““W‘ Emmi” / «2’90me (me both increasinox/ l/_Cog\s+m+' (-43 so. am decreasmfi remans 3. (Value engineering) Assume that your construction firm has been engaged to provide a value engineering review of the World Wide Plaza. Describe one VE suggestion, and briefly explain your reason for this suggestion. (8 points) l/Mm is mm m we W cm Wm M a M of 66W (mm-ma both time and mfiefl) 339% more Mia Ewe. Toe Color «:3 mew 4M:3""‘~"-“£~ “m. wool hm» hindee We Whip, bf we \omidmg‘ PaisOI‘H/I'IS WWW WW“ d ecroas I ma Semi (am'mpqeirgapaces) 'Sc4lemeaimpacll‘5594wg lower costs since spawns orders> mama we i/‘nnecwsifflifii {1‘in Sim/Baird backs Coma haw been uses. In altit‘w, ox sampmzfl Wkln't' be as necessam {me the moniker )0 appmva allfiwtfibr was (new: émc: gar W WWW Jo? teens on Dim "Issues, 4. (Constructability) Name 3 subjects/areas that are typically studied/ considered in a constructability review. (6 points) m Secbuencincgr (/ <2) t/ 5. (Compaction) What are 2 benefits of compaction? (4 points) \/ (x) moreaseg beakifl% CAPCILWA/ mu climatoin (A mpg resm— Whoa am 1903+ damn? 1/ b5 moving Nokfw/ lv‘, . L. \,vv,- __ _ . ~~:~; —————— (ox e _ 6. (Crane ut111zation, and Safety) A tower crane lS posmoned 1n an elevator shaft at the center of a 152’ Sided square building to service the whole job (including delivering to the corners of the building), including the top floor and material deliveries. The total weight of the slings, block and spreader bar used for every pick is 1,200 lb. Material deliveries arrive along an access road centered 25’ from the edge of the structure. a) Determine the minimum boom length required for the crane. (Use Table 3-10 in the back) (8 points) W?) X ' -MMA— b) What is the maximum weight (in 1b) of any crane load on this job site? (2 points) 38 W30 c) List 4 factors that affect safe crane operation. (4 points) (0 Hem @mmd (4) emer \mg CMWLMS (13> mm firm-ad. \/ (3) N0 swinging lands War People orglemcag SUM: ‘ 7. (Cost estimation) How would the costs for a construction job in San Francisco differ from the costs found in the Means guide? List 4 reasons. (12 points) (D Location ~ a'\§§even¥ most “he”: NEWER» Gm; WWW) if) "’AC‘T‘S‘W‘Q (23 mm‘mbhlbfi 03 mammals 3" availavluhl 05 mm“ lq‘f‘f’di‘i‘ 1'" we; il'flifiv- 0F a WM) (ED 0% vfldmr $5393 ‘ i / 8. Suppose that 3 excavators are available for a large excavation job, and no storage of excavated soil is possible. Dump trucks to haul away the soil arrive at a rate of one every 25 minutes. Dump trucks need to be served continuously due to high costs. The service rate of the three excavators jointly is one dump truck every 20 minutes. However, one of the three machines is shut down for the initial 90 minutes due to mechanical problems. (Assume job starts at t = 0.) a) What is the total delay for the operation? Graph the cumulative arrivals and services versus time. (30 points) b) What is the average delay? (5 points) Q“ N ‘x Wot weird ‘9? SWHQGA Event 28 n NM ~ (n r WL,&7 E x mar 4&1wa 20 ml only, 2 Ty“ 4 fl Wet. week ~30 Mm (I; x l —‘ / 1. xi / Y i l ((1) all WI 2 J. {R .‘I l W i (:0) (“‘5 Total rig-Wk arm, gstaéa-zesrw‘; w two 5."sz w: ' 1’40 NV“ Tom 49% = #0050) ’- é‘WX'fi ’t 3W” ' Mam} gTDiaD deficit: 45 'TTVCK ‘ mm ‘x l J J " ” "7 / Time Sperm?) “jag-t: {£32 i f R W _ V 25 ‘ V ‘— U Nut“? 50 l '— oo ”‘ ‘ 5 l '— qo “‘" | 100 l " HO " ' \29 \ h \‘50 '— \ l O EXTRA CREDIT: 9. What are the 4 cost components of “material costs” in cost estimation? Briefly explain them. (8 points) FMRQMSQ CW” (bus mpg) % 013+ Sm “We MWCKQ m Order (108+ => shippina, and delivera— Hakim?r 00&+<> SWW unavailabim, Cbs’r => Haw meg is me Wm M m ‘Me Warner. 1:43 sonneslvum?r is \n \ow suPphA' M 3+ w’\\\ be harder ’m afium mus l/ “gm cost 10; (Safety and Site Planning) Give 3 examples of construction site planning actions taken to increase safety. Explain your reasoning. (9 points) (0 Venfilajifiwz \n Places Where Sin)ng cheyniuxfls or paint will be mafia, 4m means Q)? nrwumzurnméY vmflahm gs ammeg\3_ Imem' This mm be ’mmugk manta; momma?Y dances; {or emcsz levels or fans to Main’am an: aw. (13 TVAE‘B‘Q ewfing“ MS lg f9“ W sagehé‘ OS we wake“ and M lDWHC' 50“ wow, To mve 10.9% persons around «0 WM sure CD delweq Muss have pig-Rde entrances. Mei exits k (2) ‘IS an (3mm age 5hr 0mg meme pummems such 49 directing mafia cup/4% mm a We \MOOUJSQ work is we close W Me canes m. 1 . (3) flaming and Handing Uhlmeg ‘, Iris impoflzmk 1m fiemgi w mmgg 50 Wt We is no surprise, “Wammd gas orelet’rfiiwlfl MMS- Bts FnOWI‘m%, wmenv: cvevmfixwmar is} We Q‘Reauflhms / 5117 (Noted? kaees can be AWE (SUCK. as max/(n3 We \me de~emwyieé 0L 30605 boned zrf rim/X Table 3—10 Maximum capacin vs. HR radius for 0 Tower crane [pounds (kilogramsn Boom Length (maximum hook radius)-fi (m) 1m Radius 265 246 208 170 131 93 ft (m) (80.8) (75.0) (83.3) (51.7) (40.0) (28.3) 70 (21 .0) 41 190 44090 44090 44090 44090 44090 (18890) (20000) (20000) (20000) (20000) (20000) 93 (28.3) 29280 31 990 38380 44090 44090 44090 (13280) (14510) (17400) 20000) (20000) (20000) 1 10 (34.0) 23980 28230 31820 Taiwan) 44090 (10870) (1 1900) (14340) (17570) (20000) 120 (37.0) 21780 23850 28820 35380 42330 (9870) (10820) (13070) (18050) (19200) 131 (40.0) 19780 21720 28280 32380 38800 (8970) (9850) (11920) (14880) (17800) 140 (43.0) 18200 20020 24290 29980 (8280) (9080) (11020) (13800) 150 (48.0) 18730 18440 22440 27780 (7590) (8380) (10180) (12590) 170(517) 14420 15940 19510 24250 (8540) (7230) (8850) (11000) 180(550) 13320 14750 18120 (8040) (8890) (8220) 190(58.0) 12440 13810 17010 (5840) (8280) (7720) 208(833) 11020 12280 15210 (5000) (5570) (8900) 220(870) 10210 11380 (4830) (5180) 230 (70.3) 9570 10890 (4340) (4850) 248 (75.0) 8840 9700 (3920) (4400) . 285 (80.8) 7720 ‘- (3500) Minimum Iifi radius = 10.5 H {3.2 m) S. W. Nunally, “Construction Methods and Management,” Prentice Hall, 5th Edition, 2001, Page 75 ...
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