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    Important Thumb Rules Used in Construction by Civil Engineers

    Uploaded by

    ramesh_hinukale
    This document provides various thumb rules that civil engineers use for quick estimations in construction projects. It includes rules for calculating concrete volume, steel quantity for slabs beams and columns, shuttering area, cement quantity for brickwork, masonry and plastering. Following these thumb rules allows for approximate calculations of materials needed without precise measurements which enables faster decision making on construction sites.

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    Important Thumb Rules Used in Construction by Civil Engineers

    Uploaded by

    ramesh_hinukale
    438 views5 pages
    This document provides various thumb rules that civil engineers use for quick estimations in construction projects. It includes rules for calculating concrete volume, steel quantity for slabs beams and columns, shuttering area, cement quantity for brickwork, masonry and plastering. Following these thumb rules allows for approximate calculations of materials needed without precise measurements which enables faster decision making on construction sites.

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    Original Title

    Civil Thumbrule

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    This document provides various thumb rules that civil engineers use for quick estimations in construction projects. It includes rules for calculating concrete volume, steel quantity for slabs beams and columns, shuttering area, cement quantity for brickwork, masonry and plastering. Following these thumb rules allows for approximate calculations of materials needed without precise measurements which enables faster decision making on construction sites.

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    438 views5 pages

    Important Thumb Rules Used in Construction by Civil Engineers

    Uploaded by

    ramesh_hinukale
    This document provides various thumb rules that civil engineers use for quick estimations in construction projects. It includes rules for calculating concrete volume, steel quantity for slabs beams and columns, shuttering area, cement quantity for brickwork, masonry and plastering. Following these thumb rules allows for approximate calculations of materials needed without precise measurements which enables faster decision making on construction sites.

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
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    The passage discusses various thumb rules used by civil engineers for approximate calculations in construction projects.

    A thumb rule of 0.038 cubic meters of concrete per square feet of plan area is discussed.

    Thumb rules of 4.5-4.75 kg/sqft of steel for residential buildings and 5.0-5.5 kg/sqft for commercial buildings are discussed. BN Datta recommendations of 1% steel for slabs, 2% for beams, 2.5% for columns and 0.8% for footings are also mentioned.

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    Important Thumb Rules used in Construction by Civil Engineers

    Important Thumb Rules used in Construction by


    Civil Engineers
     Krishna  December 14, 2018  11 Comments
    Thumb rules play a most crucial role while taking quick decisions on site. Thumb
    rules enable you to calculate the solution using a simple mathematical formula and
    make smart decisions whenever needed. Remember, thumb rules never give the
    accurate results, but you can use them for approximate results. There are many
    thumb rules which we apply in construction. Here I am discussing the most
    frequently used Thumb rules on site.

    Thumb rule is an approximate & comparing method. In thumb rules, The units are not
    the same when we compare to get the results. So never consider units while
    performing thumb rule.

    Contents [show]

    Thumb rule to calculate the Concrete Volume with respect


    to area:
    The Concrete Volume of 0.038m3 of concrete is used for each Square Feet of Plan
    area
    Example:-
    From below fig: Plan Area = 40 x 20 = 80SFT
    The plan area is 80SFT then the total volume of concrete required = 800 x
    0.038m3 = 30.4m3

    You can learn more about Concrete Volume calculation 


    Thumb rule to calculate the Steel quantity required for
    Slab, Beams, Footings & Columns:
    For Residential buildings 4.5Kgs-4.75Kgs /SFT

    For Commercial buildings 5.0Kgs-5.50Kgs/SFT

    For more accurate results you can also use BN Datta recommendations:

    As per B N Datta, the Steel quantity used in different members of the building can be
    calculated easily using the following recommendations.

    Structural Member Percentage of Steel

    Slab 1% of total volume of concrete

    Beam 2% of of total volume of concrete

    Column 2.5% of total volume of concrete

    Footings 0.8% of total volume of concrete


    Example:
    How to calculate the steel quantity of slab having the Length, width, and depth of the
    slab is 5m x 4m x 0.15m

    Step 1: Calculate the Volume of Concrete

    Total Volume of Concrete for above given Slab is 5 x 4 x 0.15 = 3m 3


    Step 2: Calculate the steel quantity using formula

    As per the above table, the steel quantity of slab is 1% of the total volume of
    concrete utilized.

    Thumb rule to calculate Steel quantity of above slab = Volume of Concrete 


    x Density of Steel x % of Steel of Member
    Steel quantity required for above slab = 3 x 7850 x 0.01 = 235Kgs

    For accurate calculation, you can refer to Bar Bending Schedule


    Thumb rule to calculate the Shuttering area:
    Shuttering costs 15-18% of the total construction of the building. Shuttering is
    framed to bring the concrete in Shape. Thumb rule to calculate the shuttering
    required is 6 times the quantity of concrete or 2.4 times of Plinth area.

    Suppose, the concrete quantity is 0.5m3 then the shuttering area required is  0.5 x 6 =
    3m2
    Components of Shuttering:-
    Shuttering Ply, Battens, Nails are components of Shuttering.

    Shuttering Ply Quantity calculation:


    The shuttering Ply has a length, width & depth of 2.44 x 1.22 x 0.012

    The No. of Shuttering Ply sheets = 0.22 times of Shuttering


    Suppose, the area of shuttering required = 3m

    Then the Shuttering Ply required = 0.22 x 3 = 0.66m2


    Battens Quantity Calculation:
    Shuttering batten usually have a length & width of 75mm x 40mm.

    Batten Quantity = 19.82 x No. of Ply Sheets


    if the construction requires 25 Ply sheets, the total quantity of Battens are 19.82 x 25
    = 495 Battens

     
    Nails & Binding Wire Quantity in Shuttering:
    75gms of Nails are used for 1m2 of Shuttering
    75gms of Binding wire is consumed for every 1m2 of Shuttering.
     

    Thumb rule for Shuttering oil Quantity:


    Shuttering oil is used to de-frame or de-assemble from the concrete easily.

    Total required Shuttering oil is = 0.065 x Total Area of Shuttering


    (or)
    For every 15m2 of shuttering 1 litre of shuttering oil is consumed.
    Example :
    15m2 is total area of shuttering,  then Shuttering oil required = 0.065 x 15 = 0.975 lts
    For Accurate Shuttering Area Calculation, You can check here Shuttering area
    required for slabs, columns, Beams, Footings
    Thumb rule for Cement, Sand, Coarse Aggregate
    Quantity in Different grades of Concrete :
    Concrete Mix Cement Quantity Coarse Aggregate Quantity Fine Aggregate Quantity

    M5 (1:5:10) 2.82 Bags 0.98m3 0.49m3

    M7.5(1:4:8) 3.48 Bags 0.97m3 0.48m3

    M10(1:3:6) 4.50 Bags 0.90m3 0.45m3

    M15(1:2:4) 6.60 Bags 0.88m3 0.44m3

    M20(1:1.5:3) 8.40 Bags 0.84m3 0.42m3


    Note: 1 bag of cement = 50Kgs

    For Accurate calculation refer to Concrete Mix design for Different grades of concrete

    Thumb rule for Cement


    quantity in Brickwork,
    Cement Masonry &
    Plastering work in
    construction:
    Brickwork Thumb rule:
    Cement Qty Cement Qty
    Brickwork for 1m3
    in m3 in Bags

    230 mm Brickwork 0.876m3 25.4 Bags

    115 mm Brickwork 0.218m3 6.32 Bags

    Cement Masonry Quantity Thumb Rule:


    Cement Masonry Type & Mix Cement Qty in Bags Cement Qty in Kgs

    200mm in Cement Masonry work of ratio 1:6 0.124Bags/m2 6.2Kgs/m2

    150mm in Cement Masonry work of ratio 1:6 0.093Bags/m2 4.65Kgs/m2

    200mm in Cement Masonry work of ratio 1:4 0.206Bags/m2 10.3Kgs/m2

    150mm in Cement Masonry work of ratio 1:4 0.144Bags/m2 7.2Kgs/m2

    100mm in Cement Masonry work of ratio 1:4 0.103Bags/m2 5.15Kgs/m2

    Plastering Quantity Thumb Rule:


    Type of Plastering Cement Qty in Bags Cement Qty in Kgs

    Rough Plastering 0.09Bags/m2 4.5Kgs/m2

    Internal Wall Plastering 0.09Bags/m2 4.5Kgs/m2

    Duct Plastering 0.09Bags/m2 4.5Kgs/m2

    External Wall plastering 0.175Bags/m2 8.75Kgs/m2

    Stucco Plastering 0.175Bags/m2 8.75Kgs/m2

    Lathen Plastering 0.55Bags/m2 27.5Kgs/m2

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