Method for constructing bearing platform on deepwater and rigid impermeable layer

Abstract

The invention discloses a method for constructing a bearing platform on a deepwater and rigid impermeable layer. The method comprises the following steps of: constructing foundation bored piles by means of an artificial island or building a platform; inserting and driving steel plate piles in a soil layer or on a covering layer of the artificial island, so as to form a steel plate pile cofferdam; assembling a short casing box cofferdam, arranging an upper inner support and a lower inner support of the steel plate pile cofferdam, gradually taking earth, lowering the short casing box to the impermeable layer, and alternatively lowering and fixing the upper inner support and the lower inner support of the steel plate pile cofferdam to designed positions; pouring top seal concrete between the steel plate piles and the short casing box cofferdam; and pumping the water in the steel plate pile cofferdam to form an anhydrous environment, and constructing the bearing platform. According to the method, the underwater top seal concrete is poured between the steel plate pile cofferdam and the short casing box cofferdam, the water is prevented from entering into the cofferdams from the bottom part after the concrete is combined with the impermeable layer; the stable structure of the cofferdams can be ensured; and the anhydrous environment can be formed in the cofferdams, the bearing platform can be constructed under anhydrous environment, and the construction quality can be ensured.

Description

technical field

[0001] The invention relates to bridge pile foundation construction, in particular to a method for constructing caps on deep water and hard impermeable layers. Background technique

[0002] The cap refers to the reinforced concrete platform connected to the pile tops set on the top of the foundation piles in order to bear and distribute the load transmitted by the pier body. The cap connects several or even dozens of piles together to form a pile foundation, which is an important part of the pile foundation.

[0003] Steel sheet pile cofferdams are generally used for construction of caps in water, but if the bottom elevation of the caps is a hard impermeable layer, the following difficulties will be encountered when using steel sheet pile cofferdams for construction:

[0004] (1) Due to the shallow depth of the ordinary steel sheet pile cofferdam inserted into the impermeable layer, the structural stability cannot be guaranteed;

[0005] (2) The excavation ...

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