Quantity Survey & Estimation – Lecture # 3

Table of Content

- Introduction to Center Line Method
- General Consideration in Center Line Method
- Example #1 & 2 on “Center Line Method”

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Quantity Survey & Estimation – Lecture # 3 – PDF

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Quantity Survey & Estimation – Lecture # 3 – Excerpt

Quantity Survey & Estimation

Course Instructor

Engr. Shad Muhammad

Lecturer, Department of Civil Engineering

Qurtuba University of Science & IT, D. I. Khan.

Review of Lecture # 2

Brick Types based on Sizes

Example #1 Brick Wall With Foundation – Its Quantity Survey And Its Estimation

Introduction to Individual Wall Method

Example # 2; Individual Wall Method Applied On Standard Modular Brick

Preparation of Estimate in Excel Sheet

Content of Lecture # 3

Introduction to Center Line Method

General Consideration in Center Line Method

Example #1 & 2 on “Center Line Method”

Centre Line Method

In this method sum – total length of centre lines of walls, long and short has to be found out.

Find the total length of centre lines of walls, of same type, long and short wall having same type of foundation and footing.

Then find the quantities by multiplying the total centre length by the respective breadth and the height.

Length and Special Considerations

In this method the length will remain the same for;

Excavation in foundation

For concrete in foundation

For all footings

For superstructure

Slight differences will occur when there are cross walls or number of junctions.

This method is quick but requires special attention and consideration at the junctions, meeting points of partitions or cross walls

Special Consideration

For rectangular, circular polygonal (hexagonal, octagonal etc.) building having no inter or cross walls, this method is quite simple.

For buildings having cross or partition walls, for every junction of partition or cross wall with the main walls special consideration shall be made to find the correct quantity.

Deduction At Junction

For each junction half breadth of the respective item or footing is to be deducted from the total centre length.

Example:

In case of one partition wall or cross wall having two junctions, for earth work in foundation trench and foundation concrete deduct one breadth of trench or concrete from the total center length.

Half breadth for one junction and one breadth for two junction. (2 × ½ = one breadth).

For footing similarly deduct one breadth of footing for two junctions from the total centre length, and so on.

Different Types Of Walls

For building having different types of wall, each set of wall shall have to be dealt separately.

Find the total centre length of walls of one type and proceed in the same manner as mentioned earlier.

Similarly, find the total centre length of walls of second type and deal this separately and so on.

Example # 1; Corners Of The Building

It may be noted that at corners of the building where two walls are meeting no subtraction or addition is required.

Example # 1

Total centre length of walls = AB + BC + CD + DA

= 5.30 + 4.30 + 5.30 + 4.30

=19.20 m

If the total centre length is multiplied by the breadth and the depth we get the quantity of earth work in excavation.

Example # 2 (Wall with Standard Modular Bricks):

Estimate by “Center Line Method” the quantities of the following items of a single room building from the given plan, section & general specifications. (Fig.1)

General Specifications:

1.Earthwork in excavation in foundation

2.Concrete in foundation

3.Brickwork in foundation and plinth

4.Brickwork in superstructure

Example # 2 (Wall with Standard Modular Bricks):

(Fig.1)

Example # 2

(Wall with Standard Modular Bricks):

Details of Measurement Form

(Link to Excel Sheet)

Example # 3 (Wall with Standard Modular Bricks):

Estimate by “Center Line Method” the quantities of the following items of a two roomed building from the given plan, section & general specifications. (Fig.2)

General Specifications:

1.Earthwork in excavation in foundation

2.Lime Concrete in foundation

3.1st Class Brickwork in cement mortar 1:6 in foundation and plinth

4.2.5 cm c.c Damp Proof Course

5.1st Class Brickwork in superstructure

Example # 3 (Wall with Standard Modular Bricks):

Method-2: Center Line Method

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