Pile driving pipes for dock construction

Just like a bridge, steel pipes can penetrate deep underground to provide sufficient support for the dock, serving as part of the foundation or assisting in concrete pouring. Steel pipe piles with anti-corrosion coatings are commonly used in construction docks. This is because they not only provide considerable load-bearing capacity, but also have corrosion resistance, allowing the dock to maintain its structural integrity and its designed service life.

1、 Application overview of pile driving pipes in dock construction

The application of pile driving pipes in dock construction is very common. The offshore deepwater dock project is being constructed on a large scale along the coast of China. As the main load-bearing pile foundation of deepwater docks, spiral welded large-diameter steel pipe piles are commonly used. Pile driving pipes are widely used in dock construction and other projects in coastal, river, and lake areas.

Design elements of pile driving pipes in dock construction

Understanding the bearing capacity of piles before construction is fundamental. It is the basic and most important parameter of pile foundation structure, including the bearing capacity of pile foundation interaction and the bearing capacity of pile body material. In the actual construction of the dock, after determining the basic bearing capacity of the pile according to the formula, a test pile is first conducted before construction, which serves as the final hammer standard for pile sinking to ensure the quality of the project. For large-diameter steel pipe piles, the ultimate bearing capacity in dock engineering may be as high as 10000KN. When conducting pile ultimate bearing capacity tests, the load should be loaded until the pile is in a state of failure or unsuitable for bearing deformation, and the loading amount should be greater than the axial load on the pile foundation during the inspection test and static load testing stage. During pile testing, there is insufficient horizontal constraint force at the top of the test pile, which can easily lead to buckling. It is necessary to adopt certain auxiliary facilities to adjust the lateral displacement of the test pile within a certain range and improve its resistance to buckling and wrinkling.

Pile structure design: mainly refers to the combination of bending and compression that it can withstand, and according to the material mechanics method, the material mechanics of the pile body is verified. The dock project requires high steel strength, and according to the port engineering specifications, the strength design value is strictly adjusted to meet the construction requirements. The probability of buckling and wrinkling between the top of the steel pipe pile and the upper structure during use is very small, but it is most likely to occur when the pile is sunk by a hammer. According to the "Code for Pile Foundation of Port Engineering", if there are certain difficulties in the process of driving steel pipe piles into the bearing layer, the ratio of the outer diameter of the pile to the wall thickness should be controlled within 70.

Pile top anchoring measures: The stress analysis of pile top anchoring is the most difficult, and the structure of the hinge joint is extremely complex. The pile top is prone to corrosion, making construction difficult. Therefore, consolidation design is widely used. The consolidation of the pile top and upper structure is achieved by embedding steel pipe piles into the upper structure and inserting steel bars into the upper structure. The bearing capacity is calculated based on the bending moment and shear stress borne by the pile top. For the corrosion resistance of steel pipe piles, methods such as reserved corrosion allowance thickness, anti-corrosion coating, and underwater YIN protection can be used. By judging the corrosion resistance of each area, appropriate anti-corrosion measures can be taken for anti-corrosion work. For example, for underwater corrosion areas, due to long-term water erosion, their resistance to corrosion is higher. Therefore, YIN electrode protection or a combination of coating and YIN electrode protection are generally used to increase their corrosion resistance.

Anti corrosion related to pile driving pipes

Anti corrosion steel pipes for pile driving can be used for anti-corrosion of pile driving pipes in dock construction. It is mainly used for anti-corrosion of the outer walls of buried or underwater steel oil, gas, water, and heating pipelines. It is also suitable for anti-corrosion of various steel structures, docks, ships, water gates, gas storage tanks, equipment in refineries and chemical plants, as well as waterproofing and leakage prevention of concrete pipes, sewage tanks, roof waterproof layers, bathrooms, basements, and other concrete structures. Common anti-corrosion steel pipes include drinking water anti-corrosion steel pipes, sewage anti-corrosion steel pipes, water supply anti-corrosion steel pipes, 3pe anti-corrosion steel pipes, epoxy coal tar anti-corrosion steel pipes, IPN8710 anti-corrosion steel pipes, cement mortar anti-corrosion steel pipes, etc. These products are widely used in pipeline engineering fields such as petroleum and natural gas, chemical industry, electronics, shipbuilding, papermaking, heating, water supply and drainage, hydropower stations, pile driving, bridges, steel structures, etc.