The EP series non-resonant vibratory hammer assists in the construction of the HG14 offshore photovoltaic project by China Communications Construction Company (CCCC) Third Harbour Consultants Co., Ltd

PART 1. New Progress in the HG14 Offshore Photovoltaic Project

Recently, with the successful unhooking of the B2-0760 photovoltaic platform, the main construction of the Guohua HG14 offshore photovoltaic project by the State Energy Group was completed, marking a phased achievement in the construction of this world's largest and China's first gigawatt-level pile-fixed offshore photovoltaic project.

During the pile foundation construction of this project, the Shanghai Zhenzhong EP series non-resonant vibratory hammers were put into service, undertaking the critical process of photovoltaic panel pile foundation construction. With outstanding performance, these hammers provided essential technical support for the driving and sinking of nearly 4,000 steel pipe piles. A professional after-sales service team was deployed for continuous monitoring, inspecting the equipment status at all times. After each construction phase, the vibratory hammers underwent inspection and maintenance to ensure stable and efficient operation.

PART 2. Construction Challenges

Construction Location: Offshore area in the eastern waters of Dongying City, Shandong Province, China

Planned installed capacity: 1 million kilowatts

Total installed capacity: 1GW

Core task of the equipment: Complete the sinking operation of 3,964 steel pipe piles to provide foundational support for 939 photovoltaic platforms.

As the world's largest open-sea photovoltaic project, the HG14 project operates in a shallow marine environment with frequent tidal changes and tight construction schedules, posing significant challenges that demand extremely high standards for equipment stability, efficiency, and precision.

Construction Challenge 1: Shallow Marine Environment with Frequent Tides

Challenge: The average water depth in the sea area ranges from 1 to 4 meters, with frequent tidal changes, limited operational periods, and difficulties in ensuring the verticality and stability of pile foundations.

Measurements: The EP series non-resonant vibratory hammer, combined with a pile stabilizing platform, ensures stable operation of the equipment during tidal fluctuations.

Guarantee: Capable of achieving continuous operation and precise pile sinking under various hydrological conditions.

Construction Challenge 2: Multiple Pile Type Transitions Limit Efficiency

Challenge: The project involves the use of steel pipe piles with two different specifications and three different tapers, all of which have an anti-corrosion coating on the outer surface. Traditional clamping fixtures not only require time-consuming adjustments but also risk damaging the anti-corrosion coating during clamping, compromising the long-term durability of the structure.

Measure: Innovatively adopt a combined fixture (internal support steel pipe clamp + standard steel pipe clamp) to quickly adapt to steel pipe piles of various diameters and tapers while perfectly avoiding damage to the external wall's anti-corrosion coating.

Guarantee: Achieved rapid switching between complex pile types, ensuring smooth pile sinking operations and maintaining overall construction efficiency.

PART3.EP series resonance free vibration hammer application highlights

The EP series resonance free vibration hammer in this project exhibits excellent pile driving efficiency:

Efficient pile sinking: The average time for sinking a single steel pipe pile (about 25 meters long, 21 meters into the mud) is only 10 minutes; With the verticality adjusted properly, the four pile groups can be completed in at least 1 hour (including auxiliary time).

Resonance free technology: effectively avoids resonance damage during start-up and shutdown, with low operating noise and low failure rate, significantly reducing resonance damage to ship machinery equipment and construction platforms.

Accurate and stable: With the stable pile platform, four piles can be continuously constructed in one positioning, meeting the verticality requirements of the project design (deviation ≤ 0.3%).

Adjustable amplitude technology: It has the advantages of "stepless adjustability, adjustable with size, and adjustable with vibration". The design elevation is controllable, reducing the need for repeated strikes, and the construction process is more precise and efficient.

Innovative fixtures: The project adopts a combination fixture, which can easily handle various specifications of pipe piles, eliminating the need for repeated adjustments of traditional fixtures and improving work efficiency and safety.

Precise and efficient peers

PART4. Results and Significance

After completion, the project is expected to generate 1.78 billion kilowatt hours of electricity annually, saving approximately 503800 tons of standard coal and reducing carbon dioxide emissions by approximately 1.3447 million tons.

The project will not only effectively reduce dependence on traditional energy, but also significantly reduce pollutant emissions, achieving positive protection of the marine ecological environment.

As the first domestic gigawatt level pile foundation fixed offshore photovoltaic project, its successful practice in the pile foundation construction stage has set an equipment technology model for similar projects in China, fully demonstrating the strength and guarantee of domestic construction equipment in clean energy construction.

The Shanghai Zhenzhong EP series resonance free vibration hammer uses "equipment foundation" to ensure "project progress".

In the future, Shanghai Zhenzhong will continue to deepen the cultivation of green and intelligent construction equipment, provide more advanced piling technology services for clean energy construction, and help achieve the national "dual carbon" strategic goals as soon as possible.