|
Screwpiles, sometimes referred to as screw piles and also called Helical piles, are a steel screw-in piling and ground anchoring system used for building deep foundations. Screwpiles are manufactured using varying sizes of tubular hollow sections for the pile or anchors shaft. The pile shaft transfers a structure's load into the pile. Helical steel plates are welded to the pile shaft in accordance with the intended ground conditions. Helices can be press-formed to a specified pitch or simply consist of flat plates welded at a specified pitch to the pile's shaft. The number of helices, their diameters and position on the pile shaft as well as steel plate thickness are all determined by a combination of: # The combined structure design load requirement # The geotechnical parameters # Environmental corrosion parameters # The minimum design life of the structure being supported or restrained. Screwpile steel shaft sections are subjected to design parameters and building codes standards for the region of manufacture. ==Installation== Screwpiles are wound into the ground much like a screw into wood. Screwpiles are installed using various earthmoving equipment fitted with rotary hydraulic attachments. Machinery varies from skid-steer loaders to 5 tonne through 80 tonne excavators. Rotary hydraulic powerheads with torque capacities ranging from 5,000Nm to 500,000Nm are custom fitted using various boom configurations. Special drive attachments connect the screwpile to the machine. Correct installation techniques are paramount to meet engineered design load and settlement outcomes. Incorrect techniques are likely to result in poor overall pile performance. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Screwpiles」の詳細全文を読む スポンサード リンク
|