SETTING OUT OF A BUILDING
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Setting Out of a Building: Defining Excavation Lines for Construction, Study notes of Construction
The process of setting out a building, which involves defining the outline of the excavation and the center lines of walls for precise construction. The center line method is preferred, and the procedure includes calculating and setting out center lines, checking their accuracy, extending and marking center lines during excavation, and marking the excavation width. The document also mentions keeping center pegs at suitable positions for complex plans.
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2021/2022
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SETTING OUT OF A BUILDING
Setting out ???
- A building is set out in order to clearly define the outline of the excavation and the centre line of the walls, so that construction can be carried out exactly according to the plan.
- The centre line method of setting out is generally preferred and adopted.
Procedure
- From the plan, the centre line of the walls are calculated. Then the centre lines of the rooms are set out by setting perpendiculars in the ratio 3:4:5. Suppose the corner points are a, b, c, d, e, f and g which are marked by pegs with nails on top.
- The setting of the corner point is checked according to diagonals ac, bd, cf and eg.
Procedure
- During excavation, the centre points a, b, c, d, e, f, g may be removed. Therefore the centre lines are extended and the centre points are marked about 2m away from the outer edge of excavation. Thus the points A1, A2, B1, B2 and likewise, are marked outside the trench. Centre line are shown clearly by stretching thread or rope. The centre points fixed 2m away from the excavation are marked with sit out pegs.