Center Line Layout Done At Sites as Per Drawing

Here is the Well explanation of the layout central line which is Very much informative. with the layout drawing. using Line Dori and Burji to make the Real building layout. 

07 Dec 2021

Do you want to know how to perform the layout plan and Alignment on the site? 

You spent money to hire any engineer doing this work. Why not you know the better approach and do it by yourself. 

Read the full blog to expand your knowledge of site Engineering. Then, here is a step-by-step solution to guide you in layout your dream house on the site.

Site cleaning

Before planning for the layout and all, Must do proper site cleaning.

Good for Construction Drawing

You would have the 2-D good for construction drawing of the layout of the entire footing dimension with perfect measurement approved from the architecture.

Permanent Benchmark

The tendering authority has Permanent marking near to your plot. The marking helps the management identify the starting point to map out the field. 

Or you should know your site plot size by plot Number and the reference from where the permanent marking is available. Know the starting Point.

Starting Point

Reference Line from the Rail Track or the Road, Tree, Traffic Light. And see the drawing –which construction line (Wall) would be parallel to that Reference Line. Two nails Point out on that reference Line—a point and B Point.

Left 4 to 6 m from the Reference Line-

As per the CPWD norms –In Feature. Maybe Road widening, electrical wirings or electrical fittings, Drain Lines. For that, 4 to 6 m of space is left from the starting point of the permanent benchmark.

Get Perpendicular Line w.r.t the Reference Line.

You find out the first line of the building, which is parallel, is the reference Line. After that, you have to find the Perpendicular Line and the Diagonal using the Pythagoras Theorem (3-4-5 Method).

Are the Lines are Perfectly Line up Or not

Strech all sides of the tape and form a right triangle with lengths of 3 m, 4 m, and 5 m. NOTE: Instead of 3 m, 4 m, and 5 m, you can choose like 6 m, 8 m, and 10 m, or 9 m, 12 m, and 15 m in the construction site.

Make Rectangular or square size construction of the layout

Using the above method, you find out all the 4 Lines, which is a perfect building plan from the Good for construction drawing.

Mark the Points in the Plot

Create the Grids- find the footing and take 100 mm extra marking for the excavation.

Line Dori

Do proper marking on the rectangular box and use Line Dori in the construction plot.

Burji method

With the Help of Line Dori, you can construct the Burji (made from concrete). The Burji should be strong enough not to be destroyed by the JCB while hovering in the construction site or not disturbed by people. In the future, you can take it as the Reference point using the Buurji. It should be there till the end of the Project.

Central Line

Centre Line is a line that passes through the center of a column. A grid of similar lines for several columns forms a centerline plan. Centreline plans help you understand the exact positioning of a column on site. The column may be of different dimensions but may have the same centerline.

Grid Lines

To find the Column Location- Mark the Location first by peripheral Lines.
    • Identify Plot Size
    • Grid Layout- You know the Outer Boundary (Grid Pillar)
    • Gridlines are the identification marks of a floor plan.
    • These are usually letters from A to Z, etc., along the vertical direction, and letters 1 to 2, etc., along the horizontal direction; that determines one particular position of a structural member on the floor plan.
    • Using gridlines will identify specific locations on the floor plan for any structural member in the floor plan.
    • It Will eventually translate into the site to locate the various positions of structural members on the ground.

Plumb-bob

The Plumb-Bob method is the most common method adopted and the easiest one you can adopt on the site and instantly find out the vertical alignment of any column.
    • For this, you have to place the plumb on the top middle crossing of the grid and observe the status of Bob; it should be touching the ground and mark on the floor.
    • Repeat the same procedure on the adjacent side of the column. 

Horizontal Alignment

Make the grid pattern all over the construction site with the help of Line Dori.

Vertical Alignment

Using the Plumb-bob, Find the Central Position of the Column.

Excavation

Dig the Pit through manual or with the Excavator machine. For this, check the Line Dori Crossing from the One Bhurji to the Other Bhurji, where crossing, Drop the Plumb-Bob-That will the Centre mark of the column. Next, find the actual position of the column Footing, column, pedestal column.

Shuttering

Measure the Cover and fix the Shuttering in the columns.

Want to Learn such practical skills? Visit India's best Civil Engineering Training Institute-Click Here!

Read to get the best Knowledge- Labour or Large Excavation Machinery- (What to use for the Excavation)

Also, Read-Rate Analysis of Felling Trees according to CPWD NORMS

For You, Read Now-What to Check When Slab Centering is done?


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