Defects of traditional sheet pile

1. The steel boxed cofferdam is a water retaining structure for pile cap construction, and its function is to provide a waterless and dry environment for pile cap construction by enclosing water on the side plate and bottom plate of the boxed cofferdam.

Compared with steel cofferdam, steel boxed cofferdam has the characteristics of short construction period, low flow resistance, convenient navigation, no need to sink into river bed, low construction difficulty and less concrete consumption, so it has been widely used in long-span deep-water bridges.

2. Steel sheet pile is the most commonly used sheet pile cofferdam, which is suitable for all kinds of soil seepage foundations. Steel sheet pile is a kind of steel with locking mouth, and its cross section has straight plate shape, groove shape and Z shape, and there are many sizes and interlocking forms. Commonly used are Larsen style, Lakwana style and so on.

Extended data:

The function of cofferdam:

In the construction of bridge foundation, when the pier and abutment foundation are below the surface water level, various forms of earth weirs are built according to local conditions; In rivers with high water depth and velocity, wooden stakes or steel sheet piles (single or double layers) cofferdams and many double-layer thin-walled steel cofferdams can be used. Cofferdam can not only waterproof and enclose water, but also support the wall of foundation pit.

This is a very important project for the reservoir reinforcement project; In the process of construction, it is necessary to study and master the slope of earth-rock dam, calculate the stability of earth-rock dam slope or cofferdam dam slope, and calculate and deal with the safety factor through a single safety factor.

Because of the obvious defects of this method, it can be said that it is increasingly exposed. In addition, the more reliable calculation method is more prominent, so a more reliable calculation method is proposed. Through the analysis of reliability theory, we can understand or consider all kinds of variability that affect slope stability. So as to strictly measure the actual degree of safety.

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