How Does Vibro Hammer Work?

How Does Vibro Hammer Work?

OMS Vibratory Piling Machines 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.

How Does Vibro Hammer Work

Features and Advantages of Vibratory Pile Drivers

Vibratory pile drivers are used to build harbors, bridges, airports, buildings, roads, rails, infrastructure, solar power, wind turbines, walls and many other foundation types. Vibratory pile drivers are modern and popular machinery for pipe, sheet and wooden piles. The most prominent feature of vibratory pile drivers 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 thet are more preferable in urban areas and downtowns.

Other features of vibratory pile drivers are as follows:

  • Vibratory pile drivers can save time and cost because they can pile the piles much faster.
  • They can be used for driving and extracting the piles from the ground.
  • They can be used underwater.
  • Vibratory hammers are lighter 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.
  • This is an 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 smaller, easy to transport and maintain.
  • The vibratory pile drivers are also very cost effective than a commonly-used hammer drivers.
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.

What is a Vibratory Hammer?

A “vibratory hammer” is a tool used to drive piles in or out of the ground for building marine docks, bridges, buildings, roads, rail, walls, and many other types of foundations. Traditional pile drivers are very loud and use a large weight to strike the pile. Vibratory hammers, however, are very quiet and have many advantages. A few advantages of vibratory hammers are that 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.

You can read about “what is the vibratory hammer?” and types of the piledriver for more details.

How Does a Vibratory Hammer Work?

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 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°.