What Is a Vibro Hammer? How It Works & How to Choose

How does a vibro hammer work?

Pairs of eccentric weights rotate in opposite directions. Their horizontal forces largely cancel, while their vertical forces combine. The gearbox transfers this repeating force through the clamp to the pile. The vibration changes the pile–soil interaction and can reduce resistance to penetration or extraction.

The pile, hammer, clamp and soil act as a system. A high centrifugal-force rating alone does not determine driving performance: eccentric moment, frequency, amplitude, pile weight and ground conditions also matter.

Gearbox and eccentric weights

Hydraulic motors drive the synchronized rotating weights that generate vibration. Lubrication and maintenance follow the operating manual for the specific model.

Hydraulic clamp

The clamp connects the hammer to the pile. Its geometry, gripping capacity and operating pressure must suit the pile profile and the intended operation.

Suppressor assembly

Elastomer elements reduce vibration transmitted to the suspension or carrier. This isolation does not eliminate vibration traveling through the ground.

Power supply and controls

A matched power pack, or a compatible excavator hydraulic circuit, supplies oil flow and pressure. The control arrangement depends on the hammer and carrier configuration.

For a general engineering explanation, see Caltrans Foundation Manual, Chapter 7, section 7-4.6 (PDF).

Applications and suitable soil conditions

Vibratory hammers are used for both installation and removal. Typical work includes:

• Sheet piles: temporary excavation support, cofferdams and waterfront retaining works.
• Steel pipe piles and casings: installation or extraction with a clamp arrangement suited to the diameter and wall thickness.
• H-piles and temporary steel sections: handling and driving with suitable gripping and lifting arrangements.

Granular soils, particularly sands, are often favorable for vibratory driving. Dense layers, cohesive soils, obstructions and changes in the soil profile can reduce penetration or require another installation method. Review the geotechnical information before selecting the hammer.

For more detail, read the soil-condition guide for vibratory and impact hammers. If you are new to the process, start with what piling is and how it supports foundations.

Vibratory hammer vs. hydraulic impact hammer

Both types can use hydraulic power, but they apply force differently. A vibratory hammer produces repeated oscillation; a hydraulic impact hammer delivers individual ram blows.

On a phone, swipe the table sideways to read every column.

See the PDCA guide to hammer principles for sheet pile installation (PDF) for industry background, or explore BRUCE hydraulic pile hammers.

Compare selected BRUCE SGV vibratory hammers

The table below summarizes four models from the BRUCE SGV specification page. U.S. customary units are included alongside the published metric values to help with equipment comparisons.

Conversions are rounded: 1 kip = 1,000 lbf ≈ 4.44822 kN; 1 US gal ≈ 3.78541 L. “vpm” means vibrations per minute. Centrifugal force is a dynamic equipment rating, not a pile bearing-capacity rating. This is a selection overview, not a lifting chart or an operating instruction.

Compare the full specification, including operating weight, amplitude, clamp options, extraction limits, hydraulic pressure and power-pack requirements. For excavator installations, consult the separate BRUCE excavator-mounted vibro hammer range rather than assuming these models fit your carrier.

How to choose a vibro hammer for a U.S. project

A useful equipment request combines pile details, ground information and carrier limits. Send the following with your inquiry:

1. Pile details: section or outside diameter, wall thickness, length, weight, target depth and quantity. Identify whether installation, extraction or both are required.
2. Ground conditions: available boring logs, groundwater information, dense layers, obstructions and the project’s driving or acceptance criteria.
3. Carrier and access: crane or excavator make and model, working radius, lifting arrangement, available headroom and access restrictions.
4. Hydraulic compatibility: available pressure and flow, cooling capacity, connections and the required power-pack or excavator interface.
5. Site constraints: nearby structures and utilities, noise and vibration requirements, and any monitoring plan specified for the work.
6. Supply and support: U.S. delivery location, required date, spare-parts needs and commissioning requirements. Confirm current availability and service arrangements with BRUCE.

Noise, ground vibration and the power source

The suppressor reduces vibration transmitted to the carrier; it does not guarantee protection for nearby buildings. Site assessment and monitoring remain separate considerations. The Caltrans Transportation and Construction Vibration Guidance Manual (PDF) explains how construction vibration is assessed.

The hydraulic hammer itself does not have a combustion engine, but a diesel power pack or excavator can produce exhaust. Confirm the proposed power source, hydraulic fluid and project requirements together.

Frequently asked questions