Methods of measuring quantities in structure
The quantities for earthwork, foundation concrete, brickwork in plinth and super structure etc. are measured with any of the two methods given below :-
- Long wall - short wall method
- Center line method
- Partly center line and short wall method
Long wall-short wall method
Under this type of method, the wall along the length of room is taken as long wall whereas the wall perpendicular to long wall is treated as short wall.
To determine the length of long wall or short wall, initially measure the center line lengths of separate walls. After that, the length of long wall, (out to out) should be measured once half breadth is added at each end to its center line length. In this way, the length of short wall calculated into in and obtained by subtracting half breadth from its center line length at each end.
The length of long wall is normally reduced from earth work to brick work in super structure whereas the short wall is raised. To obtain the quantities, these lengths are multiplied with breadth and depth.
Also read : SOME VITAL TECHNICAL TERMS IN CONSTRUCTION SITE
Center line method
This type of method is ideal for walls of equivalent cross sections. Here, the total center line length is multiplied with breadth and depth of related item to obtain the total quantity simultaneously.
If cross walls or partitions or verandah walls are attached with main wall, the center line length is decreased with half of breadth for each junction. Such junction or joints should be examined perfectly at the time of working out the total center line length. The estimates produced with this method are fully correct and rapid.
Partly center line and party cross wall method
This method is suitable when exterior (i.e. all round the building) wall contain one thickness and the interior walls contain various thicknesses. Under such situation, center line method is used to exterior walls and long wall-short wall method is applied to interior walls. This method adjusts with for the walls with various thicknesses and foundations with various levels.