Seaside ultra-deep soft foundation floating type steel sheet pile cofferdam and construction method thereof

Abstract

The invention discloses a seaside ultra-deep soft foundation floating type steel sheet pile cofferdam and a construction method thereof. The cofferdam comprises two rows of steel sheet pile walls, and the space between the two rows of steel sheet pile walls is filled with backfill to form a wall-soil-wall dam body structure. A replacement sand layer is arranged on a foundation of the cofferdam, and the two rows of steel sheet pile walls penetrate through the replacement sand layer and are inserted in a mud layer side by side. The outer side of the steel sheet pile walls is filled with a riprap compressing body, and the riprap compressing body and the replacement sand layer together form a soil and rock compressing structure. Horizontal steel sheet piles are arranged between the two rows of steel sheet pile walls and perpendicular to the axial direction of the cofferdam. The cofferdam can float on the ultra-deep mud layer, the defect that in the prior art, steel sheet piles need to be inserted in a supporting layer to ensure stability is overcome, the cofferdam is not affected by the thickness of mud on the surface layer of the foundation, and the application range is wide. The seaside ultra-deep soft foundation floating type steel sheet pile cofferdam is high in stability, short in construction cycle and low in engineering manufacturing cost, construction quality is easily guaranteed and, the construction difficulty is low.

Description

technical field [0001] The invention relates to a cofferdam in the field of construction engineering and a construction method thereof, in particular to a floating steel sheet pile cofferdam and a construction method thereof for an ultra-deep soft soil foundation along the seashore. Background technique [0002] At present, engineering construction in coastal areas such as Zhejiang and Fujian often encounters ultra-deep soft soil foundations. For example, the surface layer of the foundation in the offshore area of ​​Wenzhou is mainly silt or muddy soil with a depth of more than 30m, and the water content is greater than 60%. Weir construction is very difficult, and earth-rock cofferdams are usually used for cofferdams under this condition. Restricted by the geological conditions of the ultra-thick silt layer, the earth-rock cofferdam has the disadvantages of large amount of earth and rock, difficult construction, high engineering cost, and long construction period. The eart...

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Problems solved by technology

In the existing technology, in order to resist the horizontal displacement and ensure the stability of the cofferdam, the steel sheet piles need to penetrate the mud layer and insert into the bearing layer. If the steel sheet pile cofferdam is used on the ultra-deep mud layer foundation, super-long steel sheet piles are required, and the steel consumption is large, and the transportation And the construction process requires larger equipment, which is neither economical nor convenient

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