IS 3764:1966 is the Indian Standard (BIS) for method of test for railway track ballast. This safety code outlines essential safety guidelines for excavation work, covering trenching, deep excavations, and hard rock operations. It provides clear specifications for shoring, timbering, barricades, and safe spoil bank placement to prevent cave-ins and protect workers on site.
Specifies methods for testing physical properties of railway track ballast to ensure quality and performance.
Overview
- Status
- Current
- Usage level
- Frequently Used
- Domain
- Geotechnical — Railway Engineering
- Type
- Safety Code
Also on InfraLens for IS 3764
Practical Notes
! Always verify the location and isolate underground utilities (water, gas, electrical) before initiating excavation works.
! Maintain spoil piles at least 1.5m away from trench edges to avoid collapse caused by surcharge loading.
! Ensure appropriate shoring, stepping, or battering is implemented when excavating beyond 1.2m in loose or running soils.
Frequently referenced clauses
soilrocktimbersteel
International Equivalents
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International Comparison — Coming Soon
We're adding equivalent international standards for this code.
Key Values4
Quick Reference Values
minimum spoil bank distance1.5 m or half depth of trench, whichever is more
max trench depth without shoring loose soil1.2 m
ladder spacing in deep trenches15 m max interval
min walkway width over trench0.9 m
Tables & Referenced Sections
Key Tables
Table 1 - Size of Timber for Trench Sinking
Table 2 - Size of Timber for Shaft Sinking
Key Clauses
Clause 4 - General Safety Requirements
Clause 5 - Trench Excavation
Clause 7 - Deep Excavations
Clause 8 - Hard Rock Excavation
Frequently Asked Questions3
At what depth is shoring required for trench excavation?+
Shoring or stepping is mandatory for trenches exceeding 1.2m depth in loose or running soil.
What is the safe distance for piling excavated earth?+
Excavated earth must be piled at least 1.5m away from the trench edge or half the depth of the trench, whichever is greater.
What are the access and egress requirements for deep trenches?+
Secure ladders must be provided every 15m along the trench length and must extend at least 0.9m above the ground surface.
QA/QC Inspection Templates
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QA/QC templates coming soon for this code.