How Does Vibro Hammer Work?

How Does Vibro Hammer Work?

OMS Vibratory Piling Machines work on the ideal 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.

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°.