Circular secant pile and single-wall steel combined cofferdam and construction method

Abstract

The invention discloses a circular secant pile and single-wall steel combined cofferdam and a construction method. The circular secant pile and single-wall steel combined cofferdam comprises a circular secant pile cofferdam, a crown beam arranged on the tops of secant piles and a circular single-wall steel cofferdam arranged on the crown beam. The circular secant pile cofferdam is formed by alternately arranging the secant piles A and the secant piles B. The crown beam is of a reinforced concrete structure. The secant piles A and the secant piles B are connected into a whole through anchor bars reserved on the tops of the secant piles. The circular single-wall steel cofferdam is of a traditional structure in the prior art. The bottom of the circular single-wall steel cofferdam is welded and connected with embedded parts on the crown beam. The secant piles belong to plain concrete piles of which the tops are provided with the anchor bars or the reinforced concrete piles provided with rectangular reinforcement cages. The secant piles belong to the reinforced concrete piles provided with circular reinforcement cages or the reinforced concrete piles provided with the rectangular reinforcement cages. The circular secant pile and single-wall steel combined cofferdam is short in construction period, lower in construction risk, small in resource consumption and low in construction cost.

Description

technical field [0001] The patent of the invention belongs to the field of cofferdam construction of bridge foundations, specifically relates to a seasonal underwater foundation cofferdam, in particular to a combination of circular occlusal piles and single-wall steel that can be continuously constructed in dry seasons with island building conditions and flood periods Cofferdams and construction methods. Background technique [0002] The construction of bridge caps in water requires the use of cofferdams as supporting structures to form a dry working environment. Affected by the hydrogeological conditions of the bridge site, the construction of the cap platform in the water has derived a variety of cofferdam structures. Among them, the occlusal pile cofferdam is suitable for shallow waters or operating environments with underground seepage, and the single-wall steel cofferdam is suitable for water depths less than 10m. working environment. The bridge foundation constructio...

AI Technical Summary

Problems solved by technology

[0004] 2. The rectangular combined cofferdam proposed in the patent CN209194552 U needs to set up a construction platform on water to construct underwater occlusal piles, and there are many processes

[0005] 3. The double-walled steel cofferdam in the rectangular combined cofferdam proposed in the publication number CN209194552 U patent needs to be provided with a hollow connecting section at the bottom, and a concrete pouring hole is opened on the connecting section, and a closed steel plate is provided at the bottom of the conventional section, and there are many structural details

[0006] 4. The existing combined cofferdams have internal supports, which consume materials and installation time

[0007] 5. The adaptability of existing combined cofferdams to circular caps or square caps is poor

[0008] 6. The steel cofferdams in the existing combined cofferdams all adopt a double-wall structure, which is poor in economy under the construction environment conditions of shallow water depth and low flow velocity

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