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Construction Tolerance

This document discusses construction tolerances in building materials and components. It provides tolerance ranges for batching materials like cement, aggregate, and admixture. It also lists tolerances for formwork dimensions of columns, beams, and footings. Tolerances are given for reinforcement spacing and diameter. Additional tolerances outlined include vertical positions of columns, beams, and floors as well as plan positions of walls, columns, and floors.

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Pratik Rai
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400 views2 pages

Construction Tolerance

This document discusses construction tolerances in building materials and components. It provides tolerance ranges for batching materials like cement, aggregate, and admixture. It also lists tolerances for formwork dimensions of columns, beams, and footings. Tolerances are given for reinforcement spacing and diameter. Additional tolerances outlined include vertical positions of columns, beams, and floors as well as plan positions of walls, columns, and floors.

Uploaded by

Pratik Rai
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Construction

Tolerances
What is Construction Tolerance ?

The components used to develop buildings are Accuracy of measuring equipment in batching
regularly manufactured, assembled or formed on plant.
site, frequently manually, in conditions that might Cement : + – 2%
be not great, and utilizing materials with inherent Aggregate : + – 3%
‘imperfections’. Admixture : + – 3%
Water : + – 3%
The idea of tolerance is additionally be significant Mixing time : 2 minutes for one mixing. (Mixing
when assembling a number of components as which is being done on site)
certain things might have almost no adaptability to
oblige varieties in adjoining things. Tolerance in Form work
In C/S for columns & Beams deviation is = +
12mm more (or) – 6mm less in size
In footing plan = + 50 mm more (or) – 12 mm
less size
In depth = + – 0.05 D (specified thickness).

Example : Tolerance in Form work


In C/S for columns & Beams deviation is = +
For instance, it very well might be moderately 12mm more (or) – 6mm less in size
straight forward to change the setting out of In footing plan = + 50 mm more (or) – 12 mm
brickwork to oblige a slight variety in the size of a less size
lumber beam, or essentially to cut the beam on In depth = + – 0.05 D (specified thickness).
site, yet in the event that a double glazing unit is
even a millimeter bigger than the opening for
which it is expected, it basically won't fit..
Construction Column Vertical

Tolerances Steel : 6 mm
Timber : 10 mm
Concrete, in situ : 12 mm
Concrete, precast : 10 mm
Tolerance in Reinforcement Space between Walls
For effective depth D < = 200mm = +- 10mm For Brickwork : 20 mm
effective depth D > 200mm = +- 15mm Blockwork : 21 mm
For Cover to reinforcement = + 10mm Timber : 30 mm
Maximum freefall of concrete = 1.50 m height. Concrete, in situ : 24 mm
Concrete, precast : 18 mm
Tolerance on diameter in length
Space between Columns
0-25mm = +- 0.5 % Steel : 12 mm
25-35mm = +- 0.6 % Timber : 12 mm
35-50mm = +- 0.8 % Concrete, in situ : 18 mm
Concrete, precast : 13 mm
Tolerance on weight per metre Beams, Vertical Position
0-10mm = +- 7% Steel : 20 mm
10-16mm = +- 5% Timber : 20 mm
16 and above = +- 3% Concrete, in situ : 22 mm
Concrete, precast : 23 mm
Tolerance for cutting Length
Floors, Vertical Position
A) When the specified length is not given =
Concrete, in situ : 15 mm
+ 75mm (or) – 25 mm Concrete, precast : 15 mm
B) When the minimum length is specified =

Plan Position
+ 50 mm (or) – 0 mm Brickwork : 10 mm
Steel : 10 mm
Floors, Flatness Timber : 10 mm
Measured over a 3 m long straight edge: Concrete, in situ : 12 mm
Concrete, in situ : 5 mm Concrete, precast : 10 mm
Floor screed : 5 mm
Wall Vertical
Brickwork : 10 mm
Blockwork : 10 mm
References :
Concrete, in situ : 17 mm www.engineeringcivil.com
Concrete, precast : 11mm Design Builidings Wiki
www.engineeringtoolbox.com

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