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In steel and iron works, dimensions excepting cross-section and thickness of plate shall be measured to nearest ________ m except for reinforcement in reinforced concrete works.
0.002
0.001
0.005
0.003
0.001
According to the Indian Standard method of measurement, dimensions for steel and iron works (excluding cross-section and plate thickness) are measured to the nearest 0.001 m (1 mm). This precision is mandated to maintain uniformity in structural steel estimation and billing across civil engineering projects.
IS 1200 (Part 8): 1993 - Method of measurement of building and civil engineering works: Steelwork and ironwork
According to the Indian Standard method of measurement, dimensions for steel and iron works (excluding cross-section and plate thickness) are measured to the nearest 0.001 m (1 mm). This precision is mandated to maintain uniformity in structural steel estimation and billing across civil engineering projects.
Weight=Cross-sectional┬аArea├ЧLength├ЧUnit┬аWeight┬аof┬аSteel
The standardization of measurement precision serves to minimize cumulative errors during quantity take-offs. In steel works, length is the primary parameter for weight calculation (W=Area├ЧLength├ЧDensity), where a high degree of precision in length (0.001 m) ensures that the total weight derived is accurate enough for procurement and structural audit purposes.
Dimensions like length and width are measured to the nearest 0.001 m.
Cross-section and thickness of plates are usually measured to the nearest 0.5 mm or as specified per tolerance charts.
Reinforcement steel for RCC is measured to the nearest 0.005 m in some contexts, but IS 1200 clarifies specific precision for structural steel components.
Accuracy in measurement directly impacts the accuracy of the Bill of Quantities (BOQ).
Reduces discrepancy between estimated and actual steel consumption.
Provides a uniform standard for contractors and engineers.
Requires high attention to detail during site measurements.
Small deviations in measurement might become significant when multiplied by large quantities.
Estimation of structural steel beams and columns.
Calculation of quantities for iron grill works.
Billing of steel trusses and girders.
IS 1200-8 stipulates that for structural steelwork, the accuracy of measurement for length is 1 mm (0.001 m).
Option A (0.002), C (0.005), and D (0.003) are incorrect as they do not align with the standard precision defined for steel work measurement.
B is correct тАФ Dimensions in steel and iron works are measured to the nearest 0.001 m according to IS 1200.
Always remember that in IS 1200, most length measurements are rounded to 0.001 m, whereas mass/weight is typically calculated to the nearest 1 kg or 0.001 metric tonne.
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