Application Of Steel Sheet Pile – Oriental Sheet Piling

About The Project


Due to strong tide conditions in the area, sedimentation conditions and hydrodynamics of the area are complicated, with no obstruction providing any shelter for the artificial island. It was important therefore that the island wall structure was well-protected from external environmental conditions in the ocean to ensure the safety and durability of the man-made island.

Project Location


Located in the Jiangsu province, the Nantong Port is an exemplary example of why steel sheet pile can greatly benefit your artificial island building or land reclamation projects. The project took place 13km from the nearest shore, and is approximately 32km west of Xiao Yangkou Port, and approximately 50km southeast from Lu Si Hong.

 

Protection Methods

Specifically, the north and east sides of the island (including the northwest, northeast and southeast corners), had to be sufficiently protected through a combination of various methods (see Figure 2.1 and 2.2 below).
 
Figure 2.1 – Artificial island plan
Figure 2.2 North-side of the island wall section
 
The steel sheet piles are installed 15m away from the edges of the island, while driven 0.2m beneath the original sand level at the edges. Sheet piles installed at the northeast corner arc and on both sides of the 250m island wall are 14m in length, while the remaining sheet pile installed is 12m.

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By installing steel sheet piles on the north and south sides of the artificial island, we managed to create a “omni-directional protective effect” for all the borders of the island. What resulted from this was the continuous wall formed by the steel sheet pile underground provided more than sufficient protection for the island wall foundation and interior land area against the strong wind and waves in the area. Another benefit of deploying steel sheet pile in this particular context is that different construction methods can be adopted in different separate areas according to the surrounding environment or specific needs of your project. This particular feature was of utmost importance here where variance in tide levels and environmental complications across the large area made a single, inflexible solution inappropriate.

The deep water areas, exposed beach areas and transition zones in between all required different construction methods. More specifically, in the deep water area steel sheet piles are driven (with a vibration hammer) to -2.5m below the mud surface level to accommodate for up to 10m water depth at the highest tide levels. Additionally, steel sheet pile is welded in groups of 3~5 on delivery boats to increase water-tightness between steel sheet piles and to reduce the number of possible water leakage areas.

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Installation process of steel sheet pile

The piling boats align the lifting cranes such that they are parallel to the direction of water flow during construction which is necessary for lifting operations. In good weather conditions, construction can continue throughout the 2 periods where tide levels are highest; at the north and south areas the cranes and construction staff can be placed directly on tidal land when tide levels are low and construction is taking place nearby the artificial island’s surrounding shore areas; the northeast and northwest areas of the artificial island can also accommodate the cranes on land in low-tide periods, though piling boats will have to be stationed nearby alongside smaller transportation boats for support.

That being said, under regular low-tide conditions the construction procedure is likely to go smoothly and without interruption for the entire day. This project began on the 19th of January 2007 and ended on May 22nd , taking a total of 124 days. Approximately 4900 pieces of AU20 and AU16 steel sheet piles (totalling approximately 2750 tonnes) with lengths of 12m and 14m were used for the entire project, spanning 2650 metres.