Construction Process of Deep Truss in Steel Sheet Pile Cofferdam
Picking Steel Sheet Pile→Driving Pile Lead → Construction of Inside Support and Purlin → Sheet Piling Insert and Hit→Excavate the Excessed Stuff Inside → Pouring Back Cover Concrete → Pumping Inside Cofferdam → Cutting Steel Casing → Pile Head Chisel → Steel Rod Tie → Pouring Concrete on the Flat → Pier Construction → →Removal of Steel Sheet Pile
Notice : during the process, we should always prevent leakage, plugging and deformation.
Advantages of Deep Truss Method in Steel Sheet Pile Cofferdam
Deep truss method can be safely applied to large-scale steel sheet pile cofferdam in deep water and bad geological condition. It is able to overcome difficulties by the traditional steel sheet pile cofferdam construction technology when in the pumping mode and large spacing between the soil stays and cofferdam inside support, like steel sheet pile can not afford to the external water pressure in pumping mode. Deep truss method has a wide range of applications. In this article, we elaborates on the new truss method and its calculations in steel sheet pile cofferdam construction and construction process. We can also accumulate more new technical information on the application of steel sheet pile cofferdam.
Project Overview
Changsha Harbor Bridge is located in the south of Huizhou-Chaozhou section of Xiamen-Shenzhen Railway in China. The main bridge 55 # -88 # pier is in the water, 63 # -67 # pier is at the deepest level and has worst geological condition. The flat caps there is at the maximum size of 8.2 * 12.5m, a thickness of 2.5m. The end caps from the deepest water is calculated 9.0m; The water level of the Bridge construction is +1.528 m, consider the water level as +3.0m in calculation.
Using the German Larsen IV locking type steel sheet pile, to improve the state of force when steel sheet piles in deep water , use Deep Truss Method for steel sheet pile cofferdam construction：
Firstly make the inside support of steel sheet pile cofferdam as truss system, use decentralization device on steel casing to place it to designed elevation, and then use truss support system as the frame guide to play and insert play steel sheet pile.
This method can be applied to large-scale cofferdam in deep water and with bad geological conditions, and it is very safe. The cofferdam is using the structure of purlin and internal support. (see Figure ), for the purlin, use beam 2145b, internal support use Φ300mm (thickness δ 6mm) steel, diagonal steel connection use channel 18 . Between layers of circuit purlin use beam 2136b.
Using the German Larsen IV locking type steel sheet pile, to improve the state of force when steel sheet piles in deep water , use Deep Truss Method for steel sheet pile cofferdam construction：
Firstly make the inside support of steel sheet pile cofferdam as truss system, use decentralization device on steel casing to place it to designed elevation, and then use truss support system as the frame guide to play and insert play steel sheet pile.
This method can be applied to large-scale cofferdam in deep water and with bad geological conditions, and it is very safe. The cofferdam is using the structure of purlin and internal support. (see Figure ), for the purlin, use beam 2145b, internal support use Φ300mm (thickness δ 6mm) steel, diagonal steel connection use channel 18 . Between layers of circuit purlin use beam 2136b.
Pic Note: Three-dimensional and floor plans of steel sheet pile cofferdam
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