In sheet pile project, usually we need to set guide device, pump water, install support and weld piles. In order to ensure smooth construction process, there are some important notices.
Notes on Sheet Pile Welding
Elevation of supports’ faces must be consistent, each node should be welded by the node map, strengthen the connection, welding rods shall meet the construction specifications.
Steel support, spliced by welding, must use way of tear welding by regulations, like should fully weld the seam, at welding seam surface, welding wave is required uniform, not allow any pores, slag, cracks, sarcoma and so on. The quality of welding and inspection system should be strictly enforced.
Setting Guide or Oriented Device
Use two section steels as oriented control clamp, place and fix it in position. In case of shock must re-adjust to fix. In the driving of steel sheet pile, generally we need to send pile to the required elevation first, at this time, should remove the fixture first then gradually lift pile.
Setting oriented devices is to ensure the right sheet pile axis after construction, oriented pile or guide beam could be replaced by profile steel or wood, the spacing between the beams is just the width of sheet pile walls. In order to maintain accurate distance, between the beams, we can embed a temporary skids at certain intervals. After use, oriented devices can be removed for next section’s use.
Notes on Pumping
In steel sheet pile cofferdam, not pump until strength of concrete back cover is more than 90%. When the water level pumped inside the cofferdam is 0.5m below the steel support, stop pumping until support’s installation is completed. When pumping, pay attention to the force status between steel sheet pile and support.
Notes on Support Installation
Welded purlin as a whole should be at the same line from upper to lower part in order to enhance the overall stability of the support system. Before steel support’s installation, pull through the twine first and mark the midline on the purlin.
Steel support and steel sheet piles should against each other very tightly, between each bars connections should be pretty solid, in the construction process of bearing platform, should always check force conditions between pile and support.
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