Large-Diameter Self Drilling Anchor Bolt in Metro Open Cut Pit

With the restraint of section form, surrounding environment, and geological condition, urban metro stations mostly adopt open-cut pits for construction. The maintenance structure of the urban metro stations generally adopts sheet-pile walls, sheet-pile brace, and sheet-pile anchorage.

Why the maintenance structure of urban metro stations generally adopts sheet-pile anchorage?

The use of sheet-pile anchorage in the maintenance structure of urban metro stations is primarily due to several advantages it offers during construction and its long-term effectiveness. Here are some reasons why sheet-pile anchorage is commonly adopted:

1. Speed and efficiency

Sheet-pile anchorage allows for a faster construction process compared to other methods. The installation of sheet piles can be done quickly and efficiently, saving time and reducing construction costs.

2. Structural stability

Sheet piles provide excellent support and stability to the surrounding soil or existing structures. They act as retaining walls, preventing soil movement and ensuring the integrity of the maintenance structure.

3. Definite stressing

Sheet-pile anchorage allows for precise control over the stressing process. The sheet piles are driven into the ground, creating a strong connection that can withstand the loads and forces exerted on the maintenance structure.

4. Cost-effectiveness

Sheet-pile anchorage is a cost-effective solution for constructing maintenance structures. The materials used, such as steel sheet piles, are relatively inexpensive, making it a financially viable choice for urban metro projects.

5. Minimal impact on later construction

Sheet piles are installed deep into the ground, which minimizes their interference with future construction activities. This makes it easier to carry out other construction processes or modifications in the vicinity of the maintenance structure without significant disruption.

Overall, the combination of fast construction speed, definite stressing, good support effect, economic cost, and minimal impact on later construction makes sheet-pile anchorage a widely favored choice for the maintenance structures of urban metro stations.

The advantages of adopting large-diameter self-drilling anchor bolts in metro stations’ open-cut pits for construction

A large-diameter self-drilling anchor bolt is a specialized construction element commonly used in projects like metro open cut pits. These bolts are designed to provide stability and support to excavations, particularly in soil or rock formations where traditional anchoring methods may not be effective. The use of large-diameter self-drilling anchor bolts offers several advantages in metro open-cut pit construction:

1. Efficiency:

The large-diameter self-drilling anchor bolts combine drilling and anchoring into a single operation, reducing the overall construction time compared to traditional methods that require separate drilling and anchoring steps.

2. Versatility:

Large-diameter self-drilling anchor bolts can be used in various ground conditions, including cohesive soils, loose sands, and fractured rock formations. They provide reliable anchorage even in challenging geological conditions.

3. Load capacity:

The large diameter of these bolts allows for higher load-bearing capacities, making them suitable for applications requiring increased stability and support, such as in metro open cut pits.

4. Reduced excavation size:

The self-drilling feature eliminates the need for casing or pre-drilling, resulting in smaller excavation sizes and reduced material removal.

It's important to note that specific design considerations, such as bolt diameter, length, spacing, and grouting parameters, should be determined based on engineering calculations and site-specific conditions. Consulting with a qualified geotechnical engineer or a construction professional experienced in anchor bolt design is crucial to ensure the proper installation and performance of large-diameter self-drilling anchor bolts in a metro open cut pit or any construction project.


Some considerations regarding the use of self-drilling anchor bolts in deeper and more complex metro station excavations

As the excavation depth increases and the surrounding environment becomes more complex, the length and diameter of self-drilling anchor bolts used in open cut pit construction may need to be increased. This is done to ensure the stability and safety of the excavation and the surrounding structures. Here are some considerations regarding the use of self-drilling anchor bolts in deeper and more complex metro station excavations:

1. Increased load-bearing capacity:

Deeper excavations often require larger and longer self-drilling anchor bolts to provide sufficient load-bearing capacity. The increased length and diameter of the bolts allow for greater anchorage into the ground and enhanced stability.

2. Geological conditions:

The geological conditions surrounding the metro station site play a crucial role in determining the appropriate length and diameter of the anchor bolts. Different soil or rock formations have varying strengths and stability, requiring tailored anchor solutions.

3. Surrounding structures:

The presence of nearby structures, such as existing buildings or infrastructure, can influence the design of self-drilling anchor bolts. It's important to consider the potential impact of excavation on adjacent structures and ensure that the anchor bolts provide adequate support and prevent any detrimental effects.

4. Construction sequencing:

The length and diameter of self-drilling anchor bolts may be influenced by the construction sequence. For example, if certain sections of the excavation are completed earlier, temporary anchorages or longer bolts may be required to maintain stability during subsequent construction stages.

5. Design analysis:

Engineering calculations and analysis are crucial in determining the appropriate length and diameter of self-drilling anchor bolts. Factors such as soil or rock properties, anticipated loads, and safety factors need to be considered to ensure the bolts can effectively withstand the forces acting upon them.

It's important to work with experienced geotechnical engineers and construction professionals who specialize in anchor bolt design and have a thorough understanding of the specific project requirements and site conditions. By considering these factors and conducting a detailed design analysis, it is possible to determine the optimal length and diameter of self-drilling anchor bolts for open-cut pit construction in urban metro stations.
Sinorock is a professional self-drilling anchor bolt manufacturer and has years of experience in slope stability, foundation support, and underground engineering. If you have any questions, welcome contact us

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