What is Vibro Hammer?

Vibro hammer which is also known vibratory hammer is a machine used to drive piles in/out of the ground for constructing structures like bridges, harbors, roads, airports, canal works and so on. Vibratory pile drivers are used to build harbors, bridges, airports, buildings, roads, rails, infrastructure, solar power, wind turbines, walls and many other foundation types. Vibro hammers are modern and popular machinery for pipe, sheet and wooden piles. The most prominent feature of vibratory hammers is the sound power level. Impact hammers are very noisy owing to the fact that they make use of overweight to impact. However, vibratory hammer drivers are lighter and much faster as they do not apply extra force to the ground. Therefore that are more preferable in urban areas and downtowns.

Vibro Hammer

Modern pile drivers are quiet and have many advantages compared to traditional pile drivers which use a large weight to strike the pile. For instance the greatest advantage is that vibratory hammers can drive and extract piles much faster. Beside this, they are small, very quiet and light weight, environmental friendly. So they can drive piles much more quickly, extract old piles out of the ground, can be used underwater, are lightweight, protect the environment (especially animal life), can be used in close proximity to residential areas without noise complaints, and are small and easy to ship. Moreover, in some vibratory hammers vibration can be fully controlled, which is a necessity if the work has to be carried out in residential or historical places.

You can read about vibratory hammerswhat is the vibratory hammer? and types of the piledriver.

How Does Vibro Hammer Work?

OMS Vibro Hammer Machines also known as vibro drivers and vibratory hammers work on the idea of reducing the resistance of the ground with vibration and by changing the formation of the ground. The vibratory piling machine transfers vertical vibrations to the pile via the hydraulic clamp. This, in turn, transfers vibration to the ground which reduces the friction between the pile and the ground allowing the pile to be driven or extracted with less force. The pile is driven into the ground by a combination of the vibrators weight and the centrifugal force it produces.

If you are interested in soil improvement, top feed/bottom feed vibroflotation systems and stone column equipment you can read about ground improvement techniques.

Illustration of Vibro Hammer Working Principle

How Does Vibro Hammer Work?

Animation Video of How Vibro Hammer Works

TYPES OF VIBRATORY HAMMERS

Crane Suspended Vibratory Hammers

Excavator Mounted Vibratory Hammers

Side Grip Vibratory Sheet Pile Drivers

Advantages of Vibratory Hammers?

  • Vibro hammer can save time and cost because it drives the piles faster,
  • They can be used for driving and extracting the piles from the ground,
  • They can be used underwater,
  • It is light and user-friendly,
  • They can be used depending on both the crane and the excavator.
  • In projects which require high driving/dismounting capacity, crane suspended hammers which supply the needed energy through the power pack are used.
  • It has environmentally-friendly technology (especially to protect the fauna).
  • They supply their energy through the hydraulic or electrical energy line, but hydraulic lines are more preferred because they are lighter and stronger.
  • They are small and easy to transport and maintain.
  • The vibratory pile hammers are very cost effective than a commonly-used hammer drivers.
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Vibro Hammer Parts
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Vibration Suppressor

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Vibration Case

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Hydraulic Clamps

Eccentric Moment M (kgm):

The eccentric moment is calculated by the eccentric weight (m) and the distance from the centre of gravity to the rotation axis (r).

EksantrikMoment

Centrifugal Force F (kN):

Centrifugal Force Formula

n: Rotational Speed of Hydraulic Motor (rpm)

Amplitude A (mm):

Amplitude is the total vertical displacement of the vibrator during a full rotation of the eccentric weights. Amplitude at maximum rotational speed is obtained with the following formula:

Amplitude Formula

Amplitude Formula

M = Eccentric Moment (kgm)

md = Dynamic Weight

Dynamic Weight:

Dynamic weight is the total weight of vibrator, hydraulic clamp and pile to be driven.

Working Principle of Excavator Mounted Vibratory Drivers

Connect the pressure and return line hoses to the flowmeter which are coming from excavator. Be sure that correct connection of hoses to flowmeter’s right ports. Adjust pressure of flowmeter with restrictor to required pressure for your vibro and with adjusted pressure regulate the required flow with excavator main pumps adjusting valve.

Working Principle of Variable Moment Vibratory Drivers

The “Phase Shifter Motor” patented by OMS, displaces the eccentric masses and allows adjustment of the vibration level. By adjusting the eccentric masses by 90°, the maximum vibration level is achieved total 180°.

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