What Are Acrow Props?
Acrow props, named after the original manufacturer, have become the universal term for adjustable steel props used in construction formwork. These telescopic steel tubes allow rapid height adjustment while providing substantial load-bearing capacity for concrete slab support.
The design features an outer tube with a threaded section and an inner tube that slides within it. A central nut engages the threads, allowing precise height adjustment and secure locking at any position within the prop's range.
Specifications and Sizing
Acrow props come in various sizes to accommodate different construction requirements:
Size 0: Extended height 0.95-1.45m, light-duty applications
Size 1: Extended height 1.45-2.45m, residential floor slabs
Size 2: Extended height 2.0-3.35m, most common for standard construction
Size 3: Extended height 2.55-3.95m, commercial applications
Size 4: Extended height 3.0-4.95m, high-rise construction
Metal Shoring Jack Features
The "shoring jack" terminology refers to the adjustable base plate that allows fine-tuning of support height and alignment. Quality shoring jacks include:
Heavy-gauge steel base plates with adequate bearing area
Threaded adjustment mechanisms for precise leveling
Top plates sized to properly support formwork beams
Safety pins preventing accidental height loss
Concrete Slab Construction Applications
Acrow props support various concrete slab types:
Flat Slab Systems: Requires systematic prop layouts at grid spacing determined by slab thickness and concrete strength gain schedule.
Beam and Slab Systems: Heavier props positioned under beam locations with lighter props supporting the slab panel areas.
Post-Tensioned Slabs: Special consideration for tendon profiling and stressing operations during the support period.
Factory Wholesale Advantages
Purchasing Acrow props at factory wholesale prices offers significant benefits:
Reduced per-unit cost compared to retail sources
Direct access to current manufacturing specifications
Customization options for specific project requirements
Quality assurance from production through delivery
Proper Usage Guidelines
Ensure safe and effective use of Acrow props:
Never exceed the prop's rated load capacity at the extended height
Position props on sound, level foundations capable of bearing the applied loads
Insert safety pins through both inner and outer tubes when at working height
Maintain vertical alignment—props loaded eccentrically have reduced capacity
Follow striking schedules based on concrete strength development
References
American Concrete Institute. ACI 318-19 Building Code Requirements for Structural Concrete. Farmington Hills: ACI; 2019.
Formwork and Scaffold Association. Acrow Prop Selection and Usage Guide. London: FAS; 2018.
Occupational Safety and Health Administration. OSHA 3124-06R. Guidelines for Temporary Works. Washington: OSHA; 2021.
