Construction method of rapid sinking of double-wall steel sleeve box cofferdam in sandy cobble stratum

Abstract

The invention discloses a construction method of rapid sinking of a double-wall steel sleeve box cofferdam in a sandy cobble stratum. According to the method, the double-wall steel sleeve box cofferdam, a structural steel distribution beam, a jack, a pile foundation steel casing, a Larsen steel sheet pile, a steel ring beam, a guide device, a hydraulic pump station, a control computer and the sandy cobble stratum are included; according to the construction method, soil below the double-wall steel sleeve box cofferdam is closed, the cobble square mount in the cofferdam is fixed, the mud suction sinking time is effectively shortened, and the cofferdam sinking speed is obviously quickened. Stability of the double-wall steel sleeve box cofferdam can be improved, the effect of separating soil on the inner side and the outer side of the double-wall steel sleeve box cofferdam is achieved, a steel ring beam on the top of a Larsen steel sheet is arranged, and the aim of stabilizing a steel plate pile cofferdam hole opening is achieved; the Larsen steel sheet pile is arranged on the outer side of the double-wall steel sleeve box cofferdam, and is closed to a ring, the double-wall steel sleeve box cofferdam can smoothly sink in the closed space formed by the steel plate pile, and operation space can be provided for splicing of the next segment after the double-wall steel sleeve box cofferdam is implanted.

Description

technical field [0001] The invention relates to a water-retaining and earth-retaining structure for bridge foundations across (sea) rivers, in particular to a construction method for rapid sinking of a double-wall steel casing cofferdam in a sandy pebble stratum, and belongs to the technical field of civil engineering. Background technique [0002] According to different construction and geological conditions, the water retaining structure of the deep water foundation of the bridge has various forms such as double-wall steel box cofferdam, steel sheet pile cofferdam, reinforced concrete cofferdam, etc. The double-wall steel box cofferdam is a bridge cap The basic water-retaining and soil-retaining structure is also used as the construction formwork of the cap platform. It has no bottom and no cover. There are generally two construction methods for double-wall steel box cofferdams, one is the overall floating in place, and the other is in-situ assembly. The sinking of double-...

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Problems solved by technology

[0003] With the ever-changing development of bridges and other infrastructure fields, the requirements for the construction schedule of bridges are getting higher and higher. The construction period of underwater cofferdams and foundations of bridges is often difficult to control due to many uncertain factors, especially when it comes to double-wall steel bridge foundations. The mud suction and sinking speed of the box cofferdam in the soil layer, the traditional double-wall steel box cofferdam sinks directly to the design position after sinking to the bed, and the actual amount of mud suction is much greater than the vertical volume under the cofferdam. volume, especially when it comes to sand and pebbles and other fluid strata, the construction of mud suction is often time-consuming and labor-intensive

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