Green Field Plant Project Concurrent Preliminary Activity and Construction surveying

Concurrent Preliminary Activity before a Green Field Project

Site Clearance- The very first step is site clearance which involves removal of grass and vegetation along with any other objections which might be there in the site location

Demarcation of Site- The whole area on which construction is to be done is marked so as to identify the construction zone.

Positioning of Central coordinate and layout- The centre point was marked with the help of a thread and plumb bob as per the grid drawing. With respect to this center point, all the other points of columns were to be decided so its exact position is very critical

Surveying














Survey existing conditions of the future work site, including topography, existing buildings and infrastructure, and underground infrastructure whenever possible (for example, measuring invert elevations and diameters of sewers at manholes);

Stake out reference points and markers that will guide the construction of new structures;

Verify the location of structures during construction.

Conduct an As-Built survey: a survey conducted at the end of the construction project to verify that the work authorized was completed to the specifications set on plans.



Surveying equipment, such as levels and theodolites, are used for accurate measurement of angular deviation, horizontal, vertical and slope distances. With computerisation, electronic distance measurement (EDM), total stations, GPS surveying and laser scanning have supplemented (and to a large extent supplanted) the traditional optical instruments.[citation needed]

The builder's level measures neither horizontal nor vertical angles. It simply combines a spirit level and telescope to allow the user to visually establish a line of sight along a level plane. When used together with a graduated staff it can be used to transfer elevations from one location to another. An alternative method to transfer elevation is to use water in a transparent hose as the level of the water in the hose at opposite ends will be at the same elevation.