Cofferdam retaining and protecting structure used for marine soft soil land reclamation and construction method thereof

Abstract

The invention relates to a cofferdam retaining and protecting structure used for marine soft soil land reclamation and a construction method thereof. The retaining and protecting structure comprises alongitudinal weir body anti-seepage body, wherein the weir body anti-seepage bod comprises a weir body lower anti-seepage body under base level of the cofferdam and a weir body upper anti-seepage body over the base level of the cofferdam; bagged plain soil is piled up outside the weir body upper anti-seepage body; anti-seepage clay soil is filled between the weir body upper anti-seepage body andthe bagged plain soil; a composite geo-membrane coats an bagged plain soil and anti-seepage clay soil slope; a longitudinal construction access road is arranged inside the weir body upper anti-seepagebody; anti-seepage clay soil is filled between the weir body upper anti-seepage body and the construction access road; and the anti-seepage clay soil slope is protected by a spraying mixing layer. Onthe premise of guaranteeing retaining and protecting safety of the cofferdam, construction progress of a station main body project is quickened; and while local reinforcing trimming is needed, a construction access road platform can be utilized to reinforce anti-seepage clay oil on the middle part of the cofferdam through a mixing head, a grouting method or a piling method, and the like, so thatintegral safety of the cofferdam is improved.

Description

technical field [0001] The invention belongs to the technical field of urban rail transit engineering, and in particular relates to a cofferdam retaining structure used for land reclamation of coastal soft soil and a construction method thereof. Background technique [0002] When urban rail transit lines cross the bay and the sea, the stations are often set in coastal soft soil areas. In order to provide work space and ensure the construction safety of the main project of the station, it is necessary to carry out land reclamation and build cofferdams in the Marina Bay area. As a convenient and effective enclosure method, earth-rock cofferdam can create a dry land environment for station foundation pit construction. [0003] The current earth-rock cofferdam technology is mostly based on a single-layer waterproof membrane, which has poor anti-seepage capacity and a low safety factor of the weir body. It cannot meet the 3-5 year construction period of the subway station, nor c...

AI Technical Summary

Problems solved by technology

[0003] The current earth-rock cofferdam technology is mostly based on a single-layer waterproof membrane, which has poor impermeability and a low safety factor of the weir body. It cannot meet the construction period of 3 to 5 years for the subway station, nor can it provide long-term operation platforms and internal construction channels.

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