Boxed Cofferdam and Steel Boxed Cofferdam difference is that the former has a base plate, which is no floor. Other design calculation is basically the same. Boxed Cofferdam generally used in relatively deep riverbed, Caps bottom elevation below the surface and away from the higher river bed, in particular the kind of urgent water and the river bed is not suitable for steel box sets sinking geology. The box sets just apply to shallow areas, water flow rate is small and the geological situation is more adapted to the situation sinking steel box sets, of course, depends on the specific requirements of the design requirements and the relevant economic indicators and the river and can not be.
Steel cofferdam for water blocking structure is bearing platform construction, its role is hanging by fief concrete cofferdam side and on the floor surrounded by water, and dried to provide anhydrous environment for the construction of platform. Compared with steel cofferdam, steel box cofferdam with a short construction period, low flow resistance, which will help navigation, without sinking into the river bed, small construction difficulty, a small amount of concrete, etc., which have been widely used in the large-span bridge in deep water Applications.
Steel sheet pile cofferdam is most commonly used as a sheet pile cofferdam. Is a steel sheet pile with a lock port, there is a bar-shaped cross-section, Z-shaped groove and the like, there are a variety of sizes and interlocking forms.
Its advantages: high strength, easy to break into the hard soil; constructability in deep water, if necessary, with Diagonal bracing to become a confining cage. Waterproof performance; can form a variety of shapes as required cofferdam, and can be repeatedly used, and therefore, its use is widespread.
Often used in bridge construction worth a caisson cofferdam, its wide use. Column base, pile foundation and open-cut foundation cofferdam.
Common cofferdam mainly in the form of steel sheet pile cofferdam, cofferdam, steel boxed cofferdam, steel box cofferdam, steel-concrete composite cofferdam. Which has a steel sheet pile cofferdam construction speed, good economic returns, reusable and many other advantages, it is widely used in the construction of the bridge deep water foundation cofferdam when.