A levelling staff is held vertical at distance of 100 mm and 300 mm from the axis of a tacheometer and the staff intercept for the horizontal sight are 0.99 m and 3.00 m respectively. Find the constant of the instrument. The instrument set up at station A and the staff held vertical at point B. With the telescope inclined at a depression angle 10° to horizontal the reading on the staff are 2.670, 1.835, 1.0 m. Calculate the RC of B and its horizontal distance from A. (Given that HI = 1.42 m, and RL of A = 450.5 m)

A levelling staff is held vertical at distance of 100 mm and 300 mm from the axis of a tacheometer and the staff intercept for the horizontal sight are 0.99 m and 3.00 m respectively. Find the constant of the instrument. The instrument set up at station A and the staff held vertical at point B. With the telescope inclined at a depression angle 10° to horizontal the reading on the staff are 2.670, 1.835, 1.0 m. Calculate the RC of B and its horizontal distance from A. (Given that HI = 1.42 m, and RL of A = 450.5 m)

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

Question: 1 To determine the elevation of station A, the following observation were taken, the rod held vertically. The instrument fitted with Anallatic lens and value of constant was 100. Inst. Station Height of instrument Staff Station Vertical angle Staff Reading Remarks O 1.440 B.M - 5o40’ 1.332 1.896 2.460 R.L of BM = 158.205 m B 1.440 C.P +8o 20’ 0.780 1.263 1.746 A 1.380 C.P -6o 24’ 1.158 1.617 2.076 subject: Engneering surveyin 1
3. Given the respective reading from an internally focused instrument from a stadia rod are as follows; Upper stadia reading = 1.100m Middle reading = 1.195m Lower stadia reading = 1.290 A. What is the rod intercept S? B. Determine the stadia distance C. Compute the elevation of sighted station if the height of level instrument from the occupied station is 1.50m. Assume elevation of station occupied is 100m
A tacheometer was set up at B.M and the following observations were made with a leveling staff held vertically at P and Q. Ins: Station Staff Station Vertical Angle Hair Readings Bearings Remarks B.M P +10° 00’ 1.050, 1.103, 1.156 40° R.L of B.M =1958.500 ft Q -15° 00’ 0.952, 1.055, 1.158 140° The constant of instrument (f/i) = 100, Height of instrument = 5.15 ft Compute: The horizontal distance between P and Q Reduced Levels of P and Q Grade between P and Q
The following data were taken from the peg method of adjustment. Instrument at 1 Instrument at 2 Rod rdg. on A 4 m 3.7 m Rod rdg. on B 2 m 1.5 m Point 1 is midway between A and B. Point 2 is 20 m to the left of A, 120 m from B. 1. Determine the magnitude of the true difference in elevation between A and B. 2. Determine the correct rod reading at A for horizontal sight if the instrument is set up at point 2.
3 A tacheometer was set up at B.M and the following observations were made with a 2 10 leveling staff held vertically at A and B. Instr. Staff Vertical Hair Readings Bearings Remarks Station Station Angle В.М A +10° 00' 1.060, 1.105, 1.176 40° R.L of В.М -15° 00' 0.962, 1.075, 1.188 140° =Reg#. (ft) The constant of instrument (f/i) = 100, Height of instrument = 5.15 ft, Reg# 334 Compute: a) The horizontal distance between A and B b) Reduced Levels of A and B c) Grade between A and B
In a 3-wire Leveling, the mean reading for the backsights or foresights is computed as: O sum of the middle reading, upper reading, and lower reading divided by 3. sum of the upper reading and lower reading divided by 2. O sum of the upper reading and lower reading divided by 3. sum of the middle reading, upper reading, and lower reading divided by 2.
The following tacheometric observations were made from station A to stations 1 and 2. The height of the instrument above the ground was 1.52 m. Take stadia interval factor and constant as 100 and 0, respectively. If the staff was inclined by 1° to the vertical, solve for the following:a. Error in horizontal distance if the staff is inclined towards theinstrument for the line A-1. b. Error in the vertical distance if the staff is inclined away from theinstrument for the line A-2. c. If the elevation of point 1 is 115.673 m, determine the correctelevation of point 2.
A tacheometer is setup at A and the readings on the staff at B are 1.77m, 2.12m, 2.34m and the inclination of line of sight is + 1° 9ꞌ48". Calculate the horizontal distance between A and B. Take k = 100, c = 0.3?
A tacheometer was set up at station P and observations were made to two stations Q and R. The vertical angles to Q and R were 5°30’ and 1°08’ The cross-hair readings at Q were 2.105, 2.47 and 2.835 and those at R were 2.215, 2.56 and 2.905. The staff were held vertical in both cases. The instrument constants were 100 and 0.3. The reading from P to a BM of RL 285.35m was 2.255. The horizontal angle QPR measured was 58°30’. Find the distance QR, the gradient from Q to R and the RLs of Q and R.
Two pegs A and B are driven in the ground at a distance of abour 120 m. A dumpy level is set up at station Q exactly mid-way between pegs A and B. The staff readings on peg A and B were found to be 3.513 m and 3.149 m. The instrument was then moved and set up at a point P beyond peg A, in line BA produced at a distance of 20 m from A. The staff readings on pegs A and B were 1.763 m and 0.847 m respectively. What is the true difference in elevation between the two points? With the level in the same position at P what rod readings on B should the line of sight is adjusted. Check these reading against the true difference in elevation previously SOLVE THE FOLLOWING PROBLEMS: Problem Sketch Solution Answer
Two pegs A and B are driven in the ground at a distance of abour 120 m. A dumpy level is set up at station Q exactly mid-way between pegs A and B. The staff readings on peg A and B were found to be 3.513 m and 3.149 m. The instrument was then moved and set up at a point P beyond peg A, in line BA produced at a distance of 20 m from A. The staff readings on pegs A and B were 1.763 m and 0.847 m respectively. What is the true difference in elevation between the two points? With the level in the same position at P what rod readings on B should the line of sight is adjusted. Check these reading against the true difference in elevation previously determined. a. Sketch b. Solution C. Answer
In the two-peg of a dummy level, the following observation are taken. Rod Reading on A Rod Reading on B INSTRUMENT SET UP NEAR A 3.463 0.821 INSTRUMENT SET UP NEAR B 4.125 1.307 What is the difference in elevation between A and B? If the line of sight is not in adjustment, determine the correct rod reading on A with the instrument still set up at B. If the line of sight is not in adjustment, determine the correct rod reading on B with the instrument still set up at A.