Steel pipe shall comply with the specifications of the American Society for Testing Materials for Welded and Seamless Steel piling pipe (A252-55).
Pipe to be driven open-ended shall have a minimum nominal outside diameter of ten and three- fourths inches. Minimum nominal wall thickness for diameters less than 14 inches shall be 0.25 inch. Minimum nominal wall thickness for diameters of 14 inches or more shall be 0.375 inch.
Pipe to be driven closed-ended shall have a steel end of approved design. Minimum nominal outside diameter shall be ten and three-fourths inches. Minimum nominal wall thickness for diameters less than 14 inches shall be 0.125 inch. Minimum nominal wall thickness for diameters of 14 inches or more shall be 0.20 inch. If wall thicknesses are less than these values, the piles shall be considered as cast-in-place concrete piles.
As the major deep water dorck pile bearing capacity, piling pipe is generally choose large diameter spiral welded steel pipes (SSAW Steel Pipes). In addition, piling pipes is widely used in bridges, roads, high-rise building ect.
Production of steel piling mainly use the double submerged arc technology. A first advantage of using the double submerged arc technique is completely automated; The second advantage is conducted under submerged arc welding, the heat exchange and protection of its relatively strong performance, high quality welding out; the third advantage is the automatic submerged arc welding arc welding flux can be used under high-current, high welding efficiency.
In order to ensure the quality and progress, to prevent damage to surrounding buildings, according to the intensity of the pre-piling pile, pile size, length and pile frame is easy to move and other factors to select the correct piling order.
