Sep 11 • Machinist

Vibratory Pile Driving: How It Works and When to Use It

Vibratory pile driving installs and extracts piles by applying rapid vertical oscillations instead of repeated impact blows. A vibratory hammer is clamped to the pile and uses rotating eccentric weights to generate vibration, temporarily reducing soil resistance and allowing the pile to penetrate under the combined effect of vibration, hammer weight and any additional crowd force.

The main operating parameters are vibration frequency, amplitude and eccentric moment. Their effect depends on the interaction between the hammer, pile and soil. In granular soils, vibration can disturb particle contact and reduce shaft friction while the pile is moving. However, soil resistance can recover after installation, so driving speed alone does not confirm the final capacity of a pile.

Vibratory hammers may be crane-suspended, leader-guided or mounted on excavators. Crane-suspended systems are widely used for marine, bridge and port construction, while leader-guided systems provide greater control of pile alignment. Excavator-mounted side-grip drivers can handle, position, drive and extract piles with one machine, making them useful in restricted-access or low-headroom areas.

The method is generally most effective in loose to medium-dense non-cohesive soils such as sands and some gravels. Typical applications include sheet piles, tubular steel piles, H-piles, temporary casings, cofferdams, trestle bridges and temporary access structures. Vibratory equipment is also frequently selected for pile extraction after temporary works have been completed.

Performance becomes less predictable in dense gravel, heavily overconsolidated clay, hard layers, bouldery ground and shallow rock. A pile may move quickly through soft material and then stop at a dense or obstructed layer. Depending on the site conditions, the contractor may need a larger hammer, pre-augering, pre-drilling, water jetting, pile-end protection or a change to impact driving. Any method that changes the surrounding soil should be coordinated with the project engineer.

Vibratory driving is often chosen to reduce impulsive noise and, in suitable conditions, limit environmental disturbance compared with impact driving. Nevertheless, it does not eliminate vibration risk. Ground response depends on frequency, amplitude, pile geometry, soil layering, groundwater and distance to nearby structures. Sensitive projects may require condition surveys, baseline measurements, trigger levels and continuous monitoring. Resonance-free or variable-moment technology can help control vibration during start-up and shutdown, but site-specific assessment remains necessary.

Vibratory hammers can also be used for extraction, but removing a pile may be difficult when long-term shaft friction, soil adhesion or interlock resistance has developed. Contractors should plan extraction before installation, considering crane or excavator capacity, pile condition, access, possible damage to reusable piles and the effect on adjacent structures. Long piles may need to be extracted in stages.

Equipment selection should be based on the pile type and dimensions, soil profile, required penetration, project function, carrier capacity, hydraulic requirements, access, headroom, noise and vibration limits, productivity targets and quality-control requirements. Vibratory pile driving is not universally superior to impact driving; it is most effective when the hammer, pile, base machine and ground conditions are selected as one working system.

Source:

Wiley – "Fundamentals of the vibratory driving of piles and sheet piles"
U.S. Department of Transpostetion –"Pile Driving Guidelines"

rnd(at)machinist.fi
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SUPPORT & COOPERATION

Machinist Ltd

Ivanna Rukin and Machinist Oy will assume complete leadership of the development of this project. Machinist will manage the production team and project management.

Factories

Factories such as Junttan, Movax, Dieseko Group, ArcelorMittel and other international construction equipment manufacturers have a continuous willingness to share their knowledge, introduce it and cooperate with the engineering teams.

Häme University of Applied Sciences (HAMK)

Mechanical Engineering Department and Mr. Antti Hänninen in the Häme University of Applied Sciences (HAMK) are invited to help with project implementation.

Kajaani University of Applied Sciences

We are collaborating with Kajaani University of Applied Sciences (Kajaani AMK) which has recently received government funding for the development of VR and 3D technologies. This collaboration provides an opportunity for us to leverage Kajaani AMK's expertise and resources in the development of our online education platform. Kajaani AMK is open to ideas and ready to provide resources to support for our efforts in integrating VR and 3D technologies into our platform. This collaboration can provide us with access to cutting-edge technology and expertise, enabling us to stay ahead of the curve and offer a unique and innovative learning experience for our users.

Finnish government (Ministry of Education)

The platform is supported by the Finnish government:

1. Financially ( the country subsidizes the budget for education)

2. Technology infrastructure

3. Promotion at the government level, compulsory for the engineering force

Foreign governments

As a pilot project, the Uzbekistani government has already agreed to accept this platform as a mandatory tool for engineering society. It was agreed with the Ministry of Education that all engineers in the country would be required to undergo this kind of education. The Uzbekistan government recognizes the importance of investing in the education and training of its workforce, especially in the construction and piling industry, which has seen significant growth in recent years. By mandating this educational program, the government aims to ensure that Uzbekistan's workforce is equipped with the latest knowledge and skills to meet the demands of the industry.

Other institutions

Other educational organizations such as universities and technical polytechnics can benefit from the platform by accessing resources that can supplement their own educational offerings.

EXPANSION INTO FOREIGN MARKETS IN DEVELOPING COUNTRIES

Example: Challenges in Central Asia

Low cost of human labor
Due to the low cost of labor in the area, modern building technology and machine usage are being adopted gradually. The majority of workers on modern building projects are manual laborers, which results in low industrialization. New machinery are needed as soon as new construction approaches are adopted, which is both a difficulty and an opportunity.

Cultural mindset
In post-Soviet countries, the responsibility for infrastructural construction, development, and architecture is outsourced to so-called "Project Development Institutes." These institutes are partially private but mainly are government entities responsible for studying and implementing all innovations that are approved as legislation and used on the job sites. As a result, construction methodologies in the Project Development Institutes of the region are old and follow post-Soviet structure. The local engineering force, due to their old age, requires a lot of education about new technologies, modern ways of ground construction, and the use of new machines.

Safety requirements
The recent earthquake in Turkey has led to a surge of awareness regarding foundation construction and safety in seismic areas. In Central Asia, where a lot of ambitious projects are about to evolve drives demand for knowledge and international experience. This has resulted in local professionals actively seeking new solutions and knowledge to ensure the safety of their own construction projects.Absence of active know-howIn this market, there are no other competitors offering the same type of service to customers. Therefore, our online "University" will offer a unique value proposition to promote our know-how and machinery in the target markets. By providing access to the latest knowledge and industry insights, we can help local professionals stay ahead of the curve and meet the demands of the industry. This will not only benefit our business but also contribute to the overall economic growth and development of the region.

Industrialization level
Lower rate of technological usage in terms of machines and equipment. A lot of steps in the process are completed in an old-fashioned way. High demand in infrastructural construction requires knowledge and implementation of modern technology.

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Vibratory Pile Driving: How It Works and When to Use It

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EXPANSION INTO FOREIGN MARKETS IN DEVELOPING COUNTRIES

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