Hollow Spun Piles - Eng-Tips

Tapered spun poles have been used for a long time as power poles. Straight spun poles have been used as precast columns in buildings, but I have not heard of them being used as piles. I would question the economics of spun piles relative to typical square precast piles. cylindrical hollow spun piles were used for the original 23 mile Chesapeake Bay Bridge and Tunnel.

I'm not sure if the same pile would be economical for all solutions today pending the applications. As an example, if you google the CBBT you'll see reptition upon repetition of concrete bents and that makes a good case for economy of size/numbers. But if you had a relatively small number, I would think they are very expensive.

Regards,
Qshake

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One advantage of spun columns for use in structures like the CBBT is that the spinning process makes for highly consolidated, so very impervious concrete. I imagine they used the void for reinforcement and infill concrete for continuity with the headstocks. The spinning process leaves a segment of laitance which needs to be removed. Prestressed concrete spun piles are precast. They are centrifugal casted result in high density concrete (fc'= 50 MPa). Spun piles are competitive in price and their quality are tightly controlled.
Available pile dimensions are as follows:
Diameter(mm): 350 400 450 500 600
Thickness(mm): 70 75 80 90 100
Length of each section: 6 - 16 m
Given properties are: area of steel, area of concrete, sect modulus, effective prestress, cracking moment and ult moment. Spun piles have been used for multy storey buildings, industrial buildings, bridges. Any ideas to the loads and moments experienced in the building collapse? It looks to me that it wouldn't take much to snap those hollow piles with such soft soil around the foundation and the garage excavation.

In the realm of modern construction, spun piles have become a popular choice due to their structural efficiency and strength. A notable characteristic of spun piles is their hollow core, a feature that significantly contributes to their performance and versatility. Here’s a closer look at why spun piles are designed with a hollow interior and the benefits it provides.

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Enhanced Load-Bearing Capacity

The hollow design of spun piles is engineered to optimize their load-bearing capacity. By incorporating a hollow core, the overall weight of the pile is reduced while maintaining its structural strength. This design enables spun piles to support substantial loads, making them suitable for a variety of construction projects, from high-rise buildings to bridges and industrial structures.

Cost-Effective and Efficient

One of the primary advantages of hollow spun piles is cost-effectiveness. The reduced material usage associated with the hollow core lowers production costs without compromising the pile’s strength. Additionally, the lightweight nature of hollow spun piles simplifies handling and transportation, further contributing to overall project savings.

Improved Concrete Quality

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The spinning process used to create spun piles ensures an even distribution of concrete within the mold. The centrifugal force generated during spinning compacts the concrete, enhancing its density and durability. The hollow core allows for a more uniform concrete mix, leading to improved quality and performance of the final product.

Ease of Installation

Hollow spun piles are easier to install compared to solid piles. Their reduced weight makes them easier to handle and position during construction. This ease of installation can accelerate project timelines and reduce labor costs, making them a practical choice for contractors.

Versatility in Applications

The hollow core design of spun piles offers versatility in construction applications. The space within the pile can be utilized for various purposes, such as housing utilities or cables. This adaptability enhances the functionality of spun piles, catering to diverse project requirements.

In summary, the hollow core of spun piles is a deliberate design choice that enhances their load-bearing capacity, cost-effectiveness, and ease of installation. This innovative feature makes spun piles a valuable component in modern construction, providing strength and versatility to support a wide range of structural needs.

Contact us to discuss your requirements of Concrete Spun Pile. Our experienced sales team can help you identify the options that best suit your needs.