Overview of offshore steel pipe piles: Characteristics and applications of offshore steel pipe piles

As a widely used infrastructure in marine construction, offshore steel pipe piles have the following significant characteristics and application advantages:

characteristic

Made of high-strength steel plate: The offshore spiral steel pipe pile is made of high-strength steel plate, which has good compressive and bending resistance, and can withstand the huge pressure and impact force in the marine environment.

Spiral cone design: Steel pipe piles adopt a spiral cone design, which enables them to be firmly fixed on the seabed and withstand pressure from buildings or waves above.

Bearing capacity: Due to the spiral cone design, steel pipe piles can form a stable foundation on the seabed, which is not easily washed away by waves or seabed sediment, thus providing strong bearing capacity.

application

Marine construction infrastructure: Spiral steel pipe piles play an important role in marine construction, especially in large bridges, offshore wind power construction, and other fields.

Environmental protection features: Steel pipe piles are recyclable and have no pollution to the environment, which is in line with sustainable development.

The function and composition of pile driving boats

Function: Pile driving boats are mainly used to drive multiple steel pipe piles into the bottom of the water to form pile foundations, and are important supports for large bridges, offshore wind power construction, and other projects.

Components: The pile driving vessel consists of three parts: the hull, pile frame, and oil cylinder, which can drive vertical or inclined piles under different geological conditions.

Calculation of bearing capacity and construction technology of temporary steel pipe piles at sea

The application and construction technology of temporary steel pipe piles at sea are particularly important under certain conditions:

Calculation of bearing capacity

Calculation method: The calculation of the bearing capacity of steel pipe piles involves multiple factors, including the ultimate lateral resistance and ultimate end resistance of the soil around the pile, as well as the projected area of the pile end.

Blocking effect: During the sinking process of steel pipe piles, a part of the soil at the pile end enters the pipe to form a soil plug or core, which affects its bearing capacity.

Construction technology

Determination of bearing capacity: Calculate the rebate required for steel pipe piles based on factors such as the self weight of the box girder structure and the weight of the formwork, to ensure that they have sufficient bearing capacity.

Processing and transportation of steel pipe piles: Spiral welded pipes are used, and after processing, they are directly transported to the construction site by car to avoid damage caused by collisions and other reasons.

Positioning and sinking: Accurately measure the coordinate position of steel pipe piles through a total station and GPS to ensure the accuracy and safety of sinking.

Anti corrosion technology and challenges of offshore steel pipe piles

The main technical challenges and solutions faced by offshore steel pipe piles:

anti-corrosion technology

Powder coating process: By innovating the powder coating process, a special "coat" is wrapped around the steel pipe pile, effectively improving the anti-corrosion effect and saving a lot of construction funds.

Material application: Using specially designed anti-corrosion materials, the anti-corrosion problem of steel pipe pile structures for cross sea bridges has been successfully solved.

Technical Challenges and Solutions

Chloride ion erosion: The chloride ions rich in seawater are the "natural enemies" of concrete structures, and this problem has been successfully solved through the application of materials.

The cracking problem of large-scale concrete box girders: Low strength early tensioning technology has been adopted to overcome the global problem of cracking in large-scale concrete box girders.

In short, as an important component of marine engineering, offshore pile pipes not only face many challenges in design and construction, but also demonstrate significant technological progress and innovative achievements. With the development of ocean engineering, offshore pile pipes will continue to play an important role in providing reliable support for marine buildings.