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Bridge Triangulation

This document contains information from a civil engineering student survey camp. It includes calculations for determining the length and position of a bridge axis from angular and distance measurements of surrounding landmarks. Triangles were formed using points A, B, C, D, E, and F and internal angles and side lengths were calculated. The bridge axis was determined to be 65.000 meters long based on calculations from two triangles. All angular errors were found to be within permissible tolerances.

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Subash Poudel
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218 views3 pages

Bridge Triangulation

This document contains information from a civil engineering student survey camp. It includes calculations for determining the length and position of a bridge axis from angular and distance measurements of surrounding landmarks. Triangles were formed using points A, B, C, D, E, and F and internal angles and side lengths were calculated. The bridge axis was determined to be 65.000 meters long based on calculations from two triangles. All angular errors were found to be within permissible tolerances.

Uploaded by

Subash Poudel
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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TRIBHUVAN UNIVERSITY

INSTITUTE OF ENGINEERING
CENTRAL CAMPUS, PULCHOWK
DEPARTMENT OF CIVIL ENGINEERING
SURVEY INSTRUCTION COMMITTEE
Group no: 26 SURVEY CAMP (073 Batch)
Observer: Date:
Recorder: BRIDGE AXIS CALCULATION Weather:
Instrument: Temperature

∆ABD d/s
VALUE CORRECTION CORRECTED ANGLE LENGTH
ANGLE SIDE
D M S S D M S m
∠ABD 36 4 54 -3 36 4 51 AD 41.996
∠BAD 78 11 48 -3 78 11 48 BD 69.676
∠ADB 65 43 27 -3 65 43 24 AB 65.004
Sum 180 0 9 -9 180 0 0
correction 0 0 -9

∆ABC u/s
VALUE CORRECTION CORRECTED ANGLE LENGTH
ANGLE SIDE
D M S S D M S m
∠BAC 33 17 8 3 33 17 11 BC 41.297
∠ABC 86 58 2 4 86 58 6 AC 75.141
∠BCA 59 44 40 3 59 44 43 AB 64.997
Sum 179 59 50 10 180 0 0
correction 0 0 10
Computation of bridge axis
we know,bridge axis=AB
From triangle ABC,AB=64.997m
From triangle ABD,AB=65.004m
ERROR=0.007 m
Average axis length=65.000
precision=1:9285>1:2000(ok)
TRIBHUVAN UNIVERSITY
INSTITUTE OF ENGINEERING
CENTRAL CAMPUS, PULCHOWK

DEPARTMENT OF CIVIL ENGINEERING


SURVEY INSTRUCTION COMMITTEE
Group no: 26 SURVEY CAMP (073 Batch)
Observer: Date:
Recorder: Recalculation using average length AB Weather:
Instrument: Temperature

∆ABD d/s
VALUE CORRECTION CORRECTED ANGLE LENGTH
ANGLE SIDE
D M S S D M S m
∠ABD 36 4 54 -3 36 4 51 AD 41.996
∠BAD 78 11 48 -3 78 11 48 BD 69.802
∠ADB 65 43 27 -3 65 43 24 AB 65.000
Sum 180 0 9 9 180 0 0
correction 0 0 -9

∆ABC u/s
VALUE CORRECTION CORRECTED ANGLE LENGTH
ANGLE SIDE
D M S S D M S m
∠BAC 33 17 8 3 33 17 11 BC 41.297
∠ABC 86 58 2 4 86 58 6 AC 75.141
∠BCA 59 44 40 3 59 44 43 AB 64.997
Sum 179 59 50 10 180 0 0
correction 0 0 10

Triangle ACE (u/s)


VALUE CORRECTION CORRECTED ANGLE LENGTH
ANGLE SIDE
D M S S D M S m
∠AEC 76 33 5 -6 76 32 59 AC 75.141
∠EAC 60 18 15 -6 60 18 9 EC 67.112
∠ACE 43 8 57 -5 43 8 52 AE 52.837
Sum 180 0 17 -17 180 0 0
correction 0 0 -17
TRIBHUVAN UNIVERSITY
INSTITUTE OF ENGINEERING
CENTRAL CAMPUS, PULCHOWK

DEPARTMENT OF CIVIL ENGINEERING


SURVEY INSTRUCTION COMMITTEE
Group no: 26 SURVEY CAMP (073 Batch)
Observer: Date:
Recorder: BRIDGE SITE TRIANGULATION CALCULATION Weather:
Instrument: Temperature

∆ECF u/s
VALUE CORRECTION CORRECTED ANGLE LENGTH
ANGLE SIDE
D M S S D M S m
∠EFC 71 4 5 11 71 4 16 EC 67.112
∠CEF 50 39 2 10 50 39 12 FC 54.866
∠ECF 58 16 22 10 58 16 32 EF 60.348
Sum 179 59 29 31 180 0 0
correction 0 0 31

∆EFG u/s
VALUE CORRECTION CORRECTED ANGLE LENGTH
ANGLE SIDE
D M S S D M S m
∠EGF 71 1 49 -2 71 1 47 EF 60.348
∠GFE 63 28 13 -1 63 28 12 GE 57.094
∠FEG 45 30 2 -1 45 30 1 FG 45.515
Sum 180 0 4 -4 180 0 0
correction 0 0 -4

Permissible Error = 30"√N= 52"


All error in internal angles of triangle are inside permissible values.

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