Caofeidian Harbour District Coal Terminal Port – Oriental Sheet Piling

About The Project


The project is located in Tangshan City in the Hebei pro ince, where the Caofeidian port sits on the west shor line of the harbour. Specifically, this is 38 km west of the Tianjin port, 33 km and 92 km northeast from the Jingtang and Qinhuangdao ports respectively. On the pier consists of two 100,000 ton berths, two 70,000 ton berths and one 50,000 ton berth; it has a yearly capacity of 50 million tonnes while it spans across 1564 metres of coastline (including both ends).

Award Winning


Our Caofeidian coal terminal project was the winner of the prestigious 2014-2015 China Engineering and Construction Awards, the highest honour in China for engineering and production quality in the construction industry recognized throughout the industry as the hallmark for premium engineering quality. This is the first application of ArcelorMittal’s proprietary HZ/AZ composite wall system in mainland China, and will pioneer many future similar projects to come.

HZ/AZ Steel Sheet Pile


The structure of the main body of the terminal consists of a combination of HZ/AZ steel sheet piles. As seen in th diagram below, the front wall uses a combination of HZ975-12/ AZ18 steel sheet piles.
The HZ/AZ steel sheet pile combination plan
The HZ sheet piles are used as the primary pile, while AZ piles are used as auxiliary piles with RZU16 and RZD interlocks being applied. The relevant HZ piles were made to order at 29m long with a pile elevation level of -28.0m; the AZ auxiliary piles were made to order at 23m long, with a pile elevation level of -22m. The port has a surface elevation level of 4.5m, while front water depths go up to -15.5m.
A row of shelter piles with a section of 1.4m x 1.6m (width x height) is installed 4m behind the wall made by the combination of HZ/AZ sheet piles. These shelter piles have a bottom elevation of -32.0m and a top elevation of ±0.0m. There is a guide beam installed on top of these piles with a top elevation of +1.5m.

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The front breast wall and shelter pile’s connector beams are connected using Q550 grade φ70mm/φ75mm of steel tie rod; the shelter pile’s connector beams and anchor walls are connected using Q550 grade φ85mm (or φ90mm) steel tie rods. All three walls here are connected using the steel tie rods, the distance between each of these connecting tie rods from one another is 1.79m.

The distance between the anchor walls and the front wall is 40m. The wall has a thickness of 1.2m, and has a height of -12.0m with a top elevation level of -0.5m. Layers of gravel are laid behind the breast wall to act as a filler, while backfill sand is used further behind the filler gravel for vibration processing. The foundation for the front track beams are laid out using shelter piles, while the foundations for the rear track beam is made up of φ1200mm concrete—pouring piles.

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After a comprehensive analysis of the project diagram above. Quay structure diagram environment and possible alternatives, our team began the excavation procedure in order to begin installation of piles. We first of all began construction of the temporary cofferdam, filling it with powder and fine sand in order to create the necessary construction conditions. When the main structure of the terminal is finally complete, we remove the temporary cofferdam and are finally left with a berth.

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An APE400-H hydraulic vibration hammer (with the necessary HZ head) was used in order to install the 250 metric tonnes of primary HZ steel sheet piles necessary for this project. An APE400-A hydraulic vibration hammer (with the necessary AZ head) was used to install 150 metric tonnes of AZ sheet piles; this was supplemented by using a spiral drill to pre-drill the external soil to reduce side friction when installing the AZ piles.

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Hydraulic Vibration Hammer


An APE400-H hydraulic vibration hammer (with the necessary HZ head) was used in order to install the 250 metric tonnes of primary HZ steel sheet piles necessary for this project. An APE400-A hydraulic vibration hammer (with the necessary AZ head) was used to install 150 metric tonnes of AZ sheet piles; this was supplemented by using a spiral drill to pre-drill the external soil to reduce side friction when installing the AZ piles.
 

Installation of primary
HZ piles

Installation of primary
HZ piles

Spiral drill used to soften soil
conditions for AZ pile installation

Auxiliary pile installation


This project began on September 24th , 2006 and was completed before the end of June 2007.
A total of 10130 tonnes of the HZ/AZ combination steel sheet pile were used in the process.