Overview of Closed Pipe Pile Steel Pipe

Closed pipe pile steel pipe is a type of steel pipe pile, with its driving end in a closed state. By welding conical shaped steel or cast iron to the pipe end to seal the pipe pile end, the interior of the pipeline is usually filled with concrete after being driven into the project. The closed method helps to increase the stability and strength of the foundation. In some soil environments, closed end piles (plug piles) can better adapt to engineering needs. For example, when the pile needs to be driven to a specific depth of the stratum, the closed end of the pile can prevent soil from entering the interior of the pile pipe and further enhance the bearing capacity of the pile by filling it with concrete after driving. It is suitable for various construction scenarios, such as building, bridge, and ocean engineering infrastructure.

Characteristics of Closed Pipe Pile Steel Pipe

The good stability of the closed pile end ensures that the interior of the pile tube will not be invaded by soil during the pile driving process, thereby ensuring the integrity of the pile structure. When bearing the weight of a building, it can more effectively transfer the load to the deep soil, providing stable support for the building.

Due to its closed nature, in some soil conditions such as soft soil layers or strata that are prone to lateral pressure, closed pipe piles and steel pipes can better resist external pressure and reduce the possibility of pile deformation.

After the higher bearing capacity is driven, the interior is filled with concrete, which enhances the overall structural strength of the pile. The interaction between concrete and steel pipe walls jointly bears the load from the upper building, and the composite structure improves the bearing capacity of the piles.

Compared to open-ended pipe piles and steel pipes, enclosed ones have certain advantages in terms of bearing capacity, especially suitable for large buildings or projects with high foundation bearing capacity, such as high-rise buildings, heavy industrial plants, etc.

Manufacturing and Application of Closed Pipe Pile Steel Pipe

The manufacturing materials and processes usually use seamless or welded (SSAW or LSAW) carbon steel pipes, and the pipe ends need to be treated during the manufacturing process to achieve closure. The quality of welding is high, and it is necessary to ensure the sealing and firmness of the welding joint to prevent cracking and other problems during pile driving and use.

For enclosed pipe piles and steel pipes used in environments such as marine environments, anti-corrosion treatment such as galvanizing, FBE, or 3PE may be necessary to improve their moisture and corrosion resistance.

The application scenario is in terms of building foundations, suitable for various types of buildings, especially those that require high foundation bearing capacity, such as high-rise buildings, large commercial complexes, etc. In bridge construction, enclosed pipe piles and steel pipes can serve as the foundation for bridge piers, providing stable support and ensuring the safety and stability of the bridge during use.

In marine engineering, such as harbor construction, offshore oil platforms, etc., enclosed pipe piles and steel pipes are also widely used. The marine environment is complex and requires high stability and durability of the foundation. Enclosed pipe piles and steel pipes can meet these requirements and resist the erosion of seawater and the impact of waves.

Closed pipe pile:

Closed end pipe piles can be filled with concrete or left unfilled.

In addition to concrete, they can also fill structural shapes such as H-shaped sections and be embedded in bedrock (rock socketed piles).

If the bearing capacity of the entire pile toe area is required, a plate or conical tip should be used to seal the pile toe.

Pipe piles usually do not use core shafts and are usually driven from the pile head.

When the end of the pipe pile is equipped with a closure device, the pile becomes a displacement pile and can effectively function as a friction pile, especially in loose sandy soil.

When driven at the beginning or end, it can also be used as a high-capacity end bearing pile.

Open pipe pile:

It is expected that due to the presence of fragments, small stones, etc., the open pipe piles will be driven under strong force.

The pipeline can be equipped with drive shoes to increase the thickness of steel at the toe to reduce pressure and damage.

In the case of fixing at steep slope bedrock or design pile toe, open pipe piles can also partially CHA into the rock.

The pile driven into the open end can be filled with concrete, backfilled with sand, or the plug can be ignored after cleaning the plug.

Types of piles are also common in the installation of offshore oil platforms, whether driven from the surface or underwater. In these applications, they are primarily designed for lifting loads generated by the effects of waves or wind on the structure.

When piles or pile groups are subjected to horizontal loads and bending moments (such as ship impacts and scour on large structures such as bridges), it is recommended to use open-ended pipe piles.