What are the general requirements for the construction of structural steel sheet pile cofferdams under urban bridges?

 Do you know what kind of steel sheet pile is? Steel sheet pile is a type of steel with a locking mouth, and its cross-section includes straight plate, groove, and Z-shape, with various sizes and interlocking forms. The common type is Larson style steel sheet pile, which is a structural steel sheet pile commonly used in the construction industry. Its advantages are: high strength, easy to drive into hard soil layers; Construction can be carried out in deep water, and if necessary, diagonal supports can be added to form a cage. Good waterproof performance; It can form various shapes of cofferdams as needed and can be reused multiple times, making it widely used. Next, I will introduce to you the general requirements for the construction of structural steel sheet pile cofferdams under urban bridges?

Construction requirements:

1. Steel sheet pile cofferdam is not suitable for riverbed with large boulders and hard rocks.

2. The mechanical properties and dimensions of steel sheet piles should meet the specified requirements.

Before driving steel sheet piles, measurement and observation points should be set up upstream, downstream, and on both sides of the cofferdam to control the positioning of the long and short sides of the cofferdam. When driving, guide equipment must be prepared to ensure the correct position of the steel sheet pile.

Before driving, waterproof materials should be used to twist the seams of the steel sheet pile lock to prevent water leakage.

5. The order of application is to merge from upstream to downstream.

6. Steel sheet piles can be sunk using methods such as hammering, vibration, and water jetting, but water jetting is not suitable for sinking in clay.

7. After renovation or welding, the steel sheet pile should be subjected to a locking test and inspection using the same type of steel sheet pile. The joint position of the adjacent two steel sheet piles of the extended steel sheet pile should be staggered up and down.

During the driving process, the position of the pile should be checked at all times to ensure that it is correct and the pile body is vertical. Otherwise, it should be corrected immediately or pulled out and driven again.