Line Out Of Building

LINE OUT OF BUILDING:Following are the step for building line out: 1. Carefully Study the building drawings and take extra care for column orientation and the different column dimension in the cross section. 2. After that calculate the centre to centre distance between column (for wall also in wall load bearing system). Example: if column cross section is 230mm x 450mm While calculating centre to centre distance in 230mm direction take half 230mm on both side where as in the 450mm direction, take half of 450mm on the both side. Take extra care of some the column whose centre line is not lies in the centre line other normal columns means in row the some column may have different orientation. As show below

3. In field first fix up the longest and fixed side of building if possible. Otherwise fix up any fixed side. Then fix up the outer most centre line of building by setting perpendiculars tri-square or by 3,4,5 method. 4. After fixing the arrows at four corner check up the diagonal distance for both triangles. Keep in mind that while measuring any dimensions, steel tape must be used and both end of the tape should be in same level for accuracy. 5. Now fix up the arrows at 2.00m from perpendicular centre line and in Line with other centre line. Similarly two arrows are to be inserted at each corner for whole building. 6. Stretch out the plastic string along the fixed centre lines and tie at reference arrows at 2.00m. Strings crossing at corner of building should be made at same level by level tube. Make assure the string must not touch objects like soil columns etc.,. 7. Now check up the diagonals and if not correct adjust arrows and make Diagonal correct. 8. And mark out the other inner centre line and check up dimension as wall as diagonals and similarly fix up reference arrows at 2.00m. 9. Construct brick pillar at all reference arrows so that their top level is at same level and mark the centre of arrow on pillar top. For more convenience for future, mark the pedestal, column starter, wall Markings. 10. Footing markings are given by taking parallel line from reference for excavation. CENTRE MARKING FOR COLUMNS AFTER EXCAVATION:

1. 2.

Stretch out string along the markings on pillars and Cross check diagonals. Drop plumb bob on both side of crossing of strings in each string and keeping string align these marking and it will form plus marking at centre of column and check plus mark for perpendicular by tri-square.