Segmented casing technology in pile founfation construction

In the pile foundation treatment of construction projects, bored piles are widely used due to their strong bearing capacity and stability. However, in the face of complex and changeable geological conditions and strict construction requirements, how to ensure the construction quality of bored piles has become the focus of attention in the industry. As an important means in bored pile construction, segmented casing technology not only improves construction efficiency, but also ensures the quality of the pile body, becoming an indispensable part of modern pile foundation construction.

- Background and significance of segmented casing technology

During the construction of bored piles, the stability of the hole wall is directly related to the quality of the hole and the safety of subsequent construction. In areas with complex geological conditions (such as large changes in rock formations, high groundwater levels, and easy soil collapse), traditional continuous casing technology is often difficult to cope with. The emergence of segmented casing technology has effectively solved this problem. By dividing the casing into several sections and gradually lowering and connecting them during the drilling process, the stability of the hole wall is ensured, and the flexibility and efficiency of construction are improved.

- Working principle of segmented casing technology

The working principle of segmented casing technology is relatively simple and efficient. During the construction process, first select the appropriate casing specifications and materials according to the design requirements and geological conditions. Then, the casing is divided into several sections for processing and preparation. As the drilling goes deeper, the casing is lowered section by section and connected and fixed. Each section of the casing is tightly connected through a special connection device to ensure sealing and stability. In this way, the casing always provides stable support and protection for the hole wall during the entire drilling process.

- Advantages of segmented casing technology

1)Strong adaptability: segmented casing technology can be flexibly adjusted according to geological conditions at different depths, and effectively cope with complex and changing construction environments.

2)Improve construction efficiency: By lowering and connecting casings in sections, unnecessary waiting time can be reduced and construction efficiency can be improved.

3)Ensure pile body quality: segmented casing can ensure that the size and shape of the pile hole at different depths remain consistent, providing accurate positioning reference for subsequent steel cage lowering and concrete pouring, thereby ensuring the quality of the pile body.

4)Reduce costs: Since the casing can be used and recycled in sections, the segmented casing technology helps to reduce construction costs.

- Construction points of segmented casing technology

1)Choosing appropriate casing specifications and materials: Choosing appropriate casing specifications and materials according to design requirements and geological conditions is the basis for ensuring construction quality.

2)Accurately control the casing lowering position: During the casing lowering process, its verticality and position should be strictly controlled to ensure consistency with the design requirements.

3)Strengthen the sealing and stability of the casing connection: The casing connection is the key part of the entire casing system. The sealing and stability treatment must be strengthened to prevent mud and groundwater from infiltrating.

4)Reasonably control the pulling speed: When pulling the pipe, it should be kept at a uniform speed and slowly to avoid excessive speed causing the hole wall to collapse or the pile body to be damaged.

5)Strengthen construction monitoring and safety management: During the construction process, construction monitoring and safety management should be strengthened to promptly discover and deal with potential safety hazards to ensure construction safety.

Generally, the application of segmented casing technology in bored pile construction provides strong technical support for pile foundation construction under complex geological conditions. Through reasonable selection and construction control, segmented casing technology can not only ensure the stability of the hole wall and improve construction efficiency, but also ensure the quality and safety of the pile body. With the continuous advancement and innovation of technology, segmented casing technology will play a more important role in future pile foundation construction and contribute to the steady development of construction projects.

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