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KI TSWWCi vi lEngi neer i ngDepart ment
EXP XPERI MENTNOO-7 FLYLEVELLI NG USI NG AUTO LEVEL AI M
:Fi xi ngbenchmar kwi t hr es pec tt ot emp mpor arybenchmar kwi t hdumpyl ev elbyfly l e v e l i ngandc he c kl e v e l i ng .
Appar at us:Dumpyl ev el ,l evel i ngst aff,t r i pods t and,ar r ows,pegs Theor y:
Fl yl evel i ng:-I ti s a ver y appr oxi mat ef r om ofl eve l l i ng i n whi ch di st ances are not measur edandsi ght sar et akenasl argeaspossi bl e. I nt hi sme met hodal i neofl evel si srun t odet ermi mi neappr oxi mat el yreduced l evel soft hepoi nt scarr i ed outwi t h morer api dl y andl esspr eci si on. Che c kl e v e l i ng :Thema mai n pur po s eo ft hi st y peo fl e v e l i ngi st oc he c kt hev a l ue so ft he r educedl eve l soft hebenchma marksal r eadyfixed.I nt hi sme met hod onl ybacksi ghtand f o r e s i g htar et ake n.The r ei snone e do fi nt e r me me di at es i g ht s .Ho we v e rg r e a tc ar ehast o bet akenf orse l ect i ngt hec hangepoi nt sandf ort aki ngr eadi ngont hec hangepoi nt s bec auset heaccur acyofl e v el i ngdependsupont hese.
Sur veyFi el dWo Wor kI
KI TSWCi vi lEngi neer i ngDepart ment
PROCEDURE:
1) LetAandB t het wopoi nt sasshowni nfigur eTheyar et oof orapart. Theposi t i on ofeachsetupofl evelshoul dbesosel ect edt hatt hest aff keptont het wopoi nt si s vi si bl et hr ought het el escope. 2) LetO1,O2,O3bet heposi t i onsoft hel eve lt obeset up.Chooset hechangepoi nt s 1, 2et c.onast abl egr oundsot hatt heposi t i onoft hel eve lshoul dbemi dwaybet ween t het wost aff r eadi ngt oavoi derr orduet oi mperf ectadj ust mentoft hel evel . 3) Now set upt hel evelatO1t aket her eadi ngon t hest aff keptver t i cal l yonAwi t h bubbl ecent r al .Thi swi l lbeabac ksi ghtandR. Loft heAi si st oassumedorsayknown. Recordt heseval uesi nt hesamel i nei nt hel evelbook. 4) Now sel e c tt hepo si t i o no fC. P( 1)s ot hatt hedi s t anc eofi tf r o m O1i s appr oxi mat el yequalt ot hatO1A 5) Wi t ht hebubbl ei nt hecent ert aket her eadi ngoft hes t affhel dv er t i c al l yov ert he changepoi nt .Thi swi l lbeaf oresi ghtandbookt hi sval uei nt hel evelbookont henext l i nei nt hecol umnpr ovi ded. 6) Now shi f tt hel e v e lt oO2ands e tupi tt he r ec a r e f ul l y ,wi t ht hebubbl ei nt hec e nt r e t aker e a di ngont hes t affke ptv e r t i c al l yast hef o r es i g hto v erC. P( 1) .Thi swi l lbeabac k si ght ,booki ti nt hesamel i neast hef oresi ghtal r eadyrecor dedi nt hecol umnpr ovi ded. 7) Sel ectanot herCP( 2)ont hest abl egroundasbef oresot hatst at i onO2i s appro xi mat el ymi dwaybet weenCP( 1)andCP( 2) . 8) Wi t ht hebubbl ecent r al ,t aket her eadi ngont hes t affkeptv er t i c al l yov ert he CP2. Thi swi l lbef o r es i g htandbo oki ti nt hel e v e lbo okpag ei nne x tl i ne . 9)
Repeatt hepr ocessunt i lt hepoi ntB. Mr eached. Thel astr eadi ngwi l lbeaf oresi ght
10) Now findoutt her educedl evel sbyhei ghtofi nst rumentmet hodorbyri seandf al l me t hod. 11) Compl e t ethe remakes column also. Apply the arithmetical check
Sur veyFi el dWor kI
KI TSWCi vi lEngi neer i ngDepart ment
OBSERVATI ON TABLE: 1) Hei ghtofI nst r umentMet hod St at i on
Readi ngs B. S.
I . S
Hei ghtof i nst rument( HI )
Reduced Le v e l s( RL)
Remar ks
Reduced Le v e l s( RL)
Remar ks
F. S
A B C D
CHECK: Σ B.S – Σ F.S = LAS !L – F"!S !L
2) Ri seandFal lMet hod St at i on
Readi ngs B. S.
I . S
RI SE
FALL
F. S
A B C D
RI SE -Σ FALL=LAS !L – F"!S !L CHECK: Σ B.S – Σ F.S = Σ RESULT:Thedi ffer enceofl eve lbet weent hepoi ntbeequalt oR. Loft hel astpoi ntmi nust he R. Latt heB. Mi sf o undt obe-