IS 2506:1985 is the Indian Standard (BIS) for concrete vibrators, external type - specification. This standard covers the requirements for materials, sizes, construction, and performance of external concrete vibrators (form vibrators) primarily used for the compaction of concrete in formwork or molds.
Specifies requirements for external type concrete vibrators.
Overview
- Status
- Current
- Usage level
- Specialized
- Domain
- Structural Engineering — Scaffolding, Formwork and Construction Equipment
- Type
- Specification
Also on InfraLens for IS 2506
Practical Notes
! Formwork must be sufficiently rigid and watertight to withstand the dynamic forces generated by external vibrators.
! External vibrators are highly effective for precast concrete members, thin sections, and heavily reinforced areas where internal (needle) vibrators cannot easily reach.
! Over-vibration can cause segregation; it is crucial to continuously monitor the concrete surface for the appearance of mortar paste and cessation of air bubbles.
Frequently referenced clauses
concreteformworkprecast concrete
International Equivalents
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International Comparison — Coming Soon
We're adding equivalent international standards for this code.
Key Values3
Quick Reference Values
Minimum vibration frequency under load2800 vibrations per minute (vpm)
Motor enclosure protectionIP 44 as per IS 4691
Recommended continuous operation periodContinuous rating for specific duration without overheating
Tables & Referenced Sections
Key Tables
Table 1 - Requirements for External Concrete Vibrators
Key Clauses
Clause 4 - Sizes
Clause 5 - Material
Clause 6 - Construction
Clause 7 - Performance Requirements
Clause 9 - Tests
Frequently Asked Questions3
What is the primary application of external concrete vibrators?+
They are clamped securely to the outside of formwork or molds to compact concrete, typically used in precast yards, heavily reinforced elements, or thin wall sections.
What is the minimum operating frequency for external vibrators per the code?+
The vibrator should operate at a frequency of not less than 2800 vibrations per minute (vpm) under load.
Are there special formwork design requirements when using external vibrators?+
Yes, formwork must be explicitly designed to handle the additional dynamic stresses and fatigue, and joints must be tightly sealed to prevent mortar leakage.
QA/QC Inspection Templates
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QA/QC templates coming soon for this code.