Cold-rolled U Type Sheet Piling is a new technology exsited in late 20th century. Compared to old-fashioned Larssen Sheet Piles, the cold-rolled U sheet piles have got the following advantages:
1. Providing equivalent or better section properties (modulus) with lower material cost, which means the unit weight per square meter is lower than larssen sheet piles. This will help save material cost and as result save project cost.
2. Wider than larssen sheet piles. Less quantity or pieces of sheet piles would be needed, which will speed up the installation process. This will help save project time and as a result help save machine and labor cost.
3. Uniform thickness. Compared to Larssen sheet piles, of which the thinnest part at the interlock part is only around 6.5mm, uniform thickness makes it much more stable during installation and it won’t be easily damaged during installation.
U Type Sheet Piling normally would be delivered in single pile, and somtimes will be delivered in box pile form as per the project design. The height of the U Type Sheet Piling is always the height of combined pile (double pile).
(This article comes from SHUNLI STEEL GROUP edit released)
Driven sheet piles are thin interlocking steel sheets used to construct a continuous barrier in the ground. Interlock is typically achieved by clutching the edge of one pile into the previous pile.
A wide range of sheet pile sections and profiles are available from many steel manufacturers. c sections have a weaker interlock than hot-rolled sections. In hard driving conditions this interlock might “unzip” or cause alignment problems which would require replacement of the sheet piles. Cold-rolled sections also are usually thinner than hot rolled and thus may be more prone to overstressing during driving.
Sheet piled retaining walls are often restrained by use of internal propping, bracing, anchors or deadmen. It is often possible to extract and reuse sheet piles making this an economically attractive retaining wall system.
One of the main applications for sheet piles is for temporary retaining walls or cofferdams used to allow permanent in ground construction to be undertaken. The durability of sheet piles can be extended with protective coatings.
Driven sheet piles are often installed by vibrating hammers operated off leaders mounted on tracked base machines or suspended from crawler cranes. Diesel impact hammers and hydraulic press in machines can also be used to drive or push the piles into place. Sometimes water jetting or preboring is used to assist penetration through stiff or hard layers.
(This article comes from PILING CONTRACTORS editor released)