Tower Cranes
Luffing jib, hammerhead, flat top, and self-erecting tower cranes for construction and infrastructure. Anchoring systems, mast climbing procedures, and safe working load tables.
Hammerhead / Top-Slewing Tower Crane
The classic tower crane with a horizontal working jib and a counter-jib carrying the counterweight. Top-slewing means the entire upper works rotate on a slewing ring above the mast. The most common type worldwide for high-rise construction and infrastructure.
Key Features
- Horizontal jib with trolley for constant tip load across radius
- Self-climbing: mast extended from inside during construction
- Tied to building structure to achieve greater heights
- Load moment indicator (LMI) as standard
- Anti-collision systems for multi-crane sites
- Cab or remote pendant/radio operation
- Jib erection using luffing assist or self-erection
Typical Applications
- High-rise residential construction
- Commercial towers
- Infrastructure (bridges, dams)
- Industrial plant construction
- Stadium and arena construction
Large slewing radius requirement (safety clearance); slower to erect than self-erecting type.
Luffing Jib Tower Crane
The jib luffs (changes angle) instead of the trolley travelling horizontally. This allows the slewing radius to be reduced dramatically — the jib can be held nearly vertical when slewing over adjacent properties. Essential in dense urban environments like Mumbai, Delhi, and Dubai where hammerhead cranes cannot be used.
Key Features
- Slewing radius as small as 5–8m when jib near vertical
- Allows multiple cranes to work in close proximity
- No counter-jib overhang behind the mast
- Variable load curve based on jib angle
- Faster line speed than hammerhead at equivalent capacity
- Used with self-climbing mast systems
Typical Applications
- City-centre high-rise
- Narrow constrained sites
- Sites adjacent to existing buildings or roads
- Multi-crane urban construction sites
More complex to operate — requires experienced operator; load chart more complex (varies with jib angle).
Flat Top / Topless Tower Crane
No A-frame or peak above the jib — the jib and counter-jib connect directly to the slewing ring. Allows cranes to pass over each other without collision. Very popular in Europe and increasingly in India and UAE for sites with multiple cranes.
Key Features
- No A-frame — cranes can pass over each other
- Faster assembly (fewer components)
- Lower wind load due to reduced frontal area
- Good visibility from cab without overhead structure
- Easy hook approach from all directions
Typical Applications
- Multi-crane construction sites
- Sites with height restrictions
- Infrastructure projects with adjacent cranes
Slightly lower structural efficiency than hammerhead at same capacity; less common for very high capacities.
Self-Erecting Tower Crane
Folds and unfolds using its own hydraulics — no large mobile crane needed for erection. Can be set up in 30–60 minutes by one operator. Used on residential construction, renovations, and small commercial projects where the cost of a full-size tower crane is not justified.
Key Features
- Self-erects and self-disassembles — no assist crane needed
- Set up in 30–60 minutes
- Road transportable on standard trailer
- Low capital cost relative to other tower crane types
- Radio remote control standard
- Concrete ballast base — no foundation usually required
Typical Applications
- Villa and bungalow construction
- Low-rise residential blocks
- Renovation projects
- Temporary erection for bridge works
Limited capacity (typically <6t); limited height; not suitable for high-rise.
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