Site Surveying Assignment.

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Tejinder Sohel

Site Surveying Assignment.

Assignment Questions: -

  1. With the aid of Angular and Distance Measuring Equipment, carry out a closed traverse survey of an area chosen by your Tutor and the group. Plot your survey data using recorded calculations and show all angles and lengths of traverse sides and any corrections. Using latitudes and departures, calculate the area enclosed by your traverse. Check the calculated area by triangulation using sealed dimensions from your closed traverse.
  2. Woodworth & Sons Ltd have asked your company to carry out the setting out to the building in the plans. As the Trainee Engineer on site, you are required to produce a setting out drawing and explain the practical process of carrying out the setting out details.

Assignment: -

Check logging sheet for angles and lengths of the traverse survey.

Diagrammatic illustration of closed traverse survey (using mean calculated angles)

Measurement and correction of the External Angles of the Traverse Survey

Mean angles Added

The sum of the external angle of a closed traverse = (2n + 4) x 90°

Where n = number of traverse stations.

Hence sum = (2 x 4 + 4) x 90° = 1080°

An error of 30√n seconds is generally acceptable in surveying for construction/engineering works. If there is a bigger error then the measurements should be taken again.

30√n = 30√4 = 60”

Therefore our acceptable error = 60”

Our error is 11”

Correction into traversed survey = 11”/ 4 = 2.75”

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Therefore 2.75” needs to be deducted from our survey to allow for the error during the survey. Because we need to avoid decimal of seconds, what is preferable is that I minus 3” from the three bigger external angle readings and the minus 2” from the lowest external angle reading. This will result in a total of 11” correction to the traverse survey and lead to the correct sum angle of 1080° 00’ 00”.

 

Calculation of the Whole Circle Bearings and Reduced Bearings of the Lines of the Traverse.

The whole circle bearing (WCB) ...

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