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CN106 Engineering Surveying

sSchool of the Environment

Semester 2 Examinations 2005-2006

CN106

ENGINEERING SURVEYING

Instructions:

Time allowed: TREEhours

!n"wer: Answer!##uestions

Item" "$%%lied: !athematica" #ormu"ae

!ll wor&in' m$"t (e "hown

$e%nes%ay & 'une 2005 (:)0 -12:)0 hours

*age 1 o+

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CN106 Engineering Surveying

)$e"tion 1

*a+ ,uring a two-eg test on a "eve". +our oints E. #. / an% are egge%

out in a straight "ine such that E# #/ / 25 m

3ea%ings ta4en with a "eve" at # gave va"ues o+ 1(0& m an% 1&)2 mon "eve""ing sta++s he"% vertica""y at E an% / resective"y $ith the "eve"at . rea%ings o+ 201 m at E an% 161 m at / were o7taine%

Ca"cu"ate the co""imation error o+ the "eve" an% state i+ a%8ustment isreuire%

96 mar4s

*(+ ;he +o""owing measurements were recor%e% using a tota" station %uringa %etai" survey

At station A 3< 1(1&5 meight o+ tota" station a7ove A 1(5 meight o+ re+"ector 9rism on %etai" o"e 1)50 m

,oint"i'hted

ori-ontalan'le

Verticalcircle

readin'

Slo%edi"tance

1 00= 55> 20? &= 0)> 10?

)1&5 m

2 &)= 1(> )0? (2= 1&> 50?

50& m

) = )6> 00? (= 00> 20?

2&)65 m

Ca"cu"ate the heights o+ oints 1. 2 an% )9& mar4s

*c+ ;he o7servations given 7e"ow were ta4en with a tota" station

Total"tation%o"ition

Reflector%o"iti

on

ori-ontalcircle

readin'

Vertical an'le Slo%edi"tance

@ A 11&552 02)5 25)6 m

@ B 220))05 022& 205 m

*age 2 o+

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CN106 Engineering Surveying

Ca"cu"ate the horiDonta" %istance 7etweenA an% B9&mar4s

*age ) o+

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CN106 Engineering Surveying

)$e"tion .

*a+ ;he measure% ang"es an% "engths o+ a c"ose% o"ygon traverse aregiven 7e"ow

!n'le /("erved an'le #ine ori-ontal len'th

A &000 AB 102612 m

B 111&20 BC 10625( m

C (&60 CD 10)0 m

D 6)1600 DA 1651 m

Ca"cu"ate the +ractiona" "inear misc"osure +or the traverse91 mar4s

*(+ ;he coor%inates o+ three contro" stations P. Qan% R are given 7e"ow

Station Coordinate"

mE mN

P 5621 2&01(

Q 25)62 )0)0

R 1(&5 )525&

Ca"cu"ate the interna" ang"es an% "engths o+ the triang"e PQR+orme% 7ythese stations

96 mar4s

*age o+

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CN106 Engineering Surveying

)$e"tion

;he corners o+ a rectangu"ar 7ui"%ing B1. B2. B) an% B are to 7e set outusing a tota" station an% site gri% oints S1 an% S2 ;he coor%inates o+ the7ui"%ing corners an% oints S1 an% S2 are:

Site 'rid %oint or($ildin' corner

Coordinate"

mE mN

B1 500000 500000

B2 5126 505(1&

B) 51620 (21)

B 50)5(2 (22(6

S1 525000 525000

S2 525000 &5000

9a I+ site gri% oint S2 is inaccessi7"e 7ut can 7e sighte% +rom S1.ca"cu"ate the %ata reuire% to set out a"" the 7ui"%ing corners +rom sitegri% oint S1

910 mar4s

97 ;he setting out is chec4e% 7y measuring a"" the 7ui"%ing si%es an%%iagona"s with a )0 m stee" tae "ai% on the groun%

#or the %iagona" +rom B1 to B) the +o""owing measurements wereta4en:

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CN106 Engineering Surveying

)$e"tion

An existing sewer at A is to 7e exten%e% to a oint B on a +a""ing gra%ient o+ 1in 10;he horiDonta" %istance AB (615 m

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CN106 Engineering Surveying

)$e"tion 2

10 !u"ti"e choice uestions*"ease choose the !S; C33EC; ANS$E3 +or each uestionI+ you thin4 the answer to Fuestion 51 is e write 231 4 ein your answer 7oo4

3eeat +or a"" other uestions

T5/ mar&" each

51 ;he main urose o+ engineering surveying on a construction site is to

a *ro%uce mas or "ans o+ the site7 !easure an% cost vo"umes o+ materia" move% aroun% the sitec Carry out as-7ui"t surveys +or a ro8ect% Ensure that the ro8ect is 7ui"t with the correct %imensions

e !onitor +or structura" movement

52 #or traversing. a reconnaissance is carrie% out to

a !a4e sure the survey euiment to 7e use% is avai"a7"e7 !a4e sure that the site is accessi7"ec 00? is the +irst rea%ing7 ;wo roun%s must 7e ta4en to chec4 +or any mista4esc n"y one roun% can 7e ta4en% #ace right rea%ings are not necessarye None o+ these a"y

5 ;he who"e circ"e 7earing o+ a "ine

a Is a"ways an ar7itrary %irection chosen +or convenience7 Is measure% antic"oc4wise +rom a chosen north %irectionc

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CN106 Engineering Surveying

56 ne o+ the a%vantages o+ using /*S on site is

a It is not exensive to insta""7 It is much more accurate than using tota" stationsc It can measure heights much more accurate"y than 7y "eve""ing% It is use% 7y one erson when setting oute None o+ these

5& 3otating "aser instruments are use% in surveying +or

a !easuring ang"es an% %istances7 Setting out using coor%inatesc *ie"aying%