Combined steel pile cofferdam provided with water swellable waterproof rubber fore shaft

Abstract

The invention discloses a combined steel pile cofferdam provided with a water swellable waterproof rubber fore shaft, which comprises cofferdam pegs and cofferdam long piles used for connecting two adjacent cofferdam pegs. Each cofferdam peg comprises a U-shaped steel sheet pile and a fore shaft sub-part, and the left and right ends of each U-shaped steel sheet pile are respectively and fixedly connected with one fore shaft sub-part. Each cofferdam long pile comprises a steel pipe pile, a fore shaft parent part arranged at the outer side of the steel pipe pile, and a water swellable rubber liner arranged in the fore shaft parent part; a tubular inner cylinder matched with each fore shaft sub-part and a notch connecting the interior of each tubular inner cylinder with the exterior of each tubular inner cylinder are arranged on the fore shaft parent part; each water swellable rubber liner is fixedly arranged on the inner wall of the corresponding tubular inner cylinder; each fore shaft sub-part is sleeved into the corresponding tubular inner cylinder; and bentonite compound filler is filled in a gap between each fore shaft sub-part and each water swellable rubber liner. By taking the combination of a rigid steel pile and a flexible steel pile to have complementary advantages, the combined steel pile cofferdam has good water resistance; the fore shaft is reliable in connection; the material of the combined steel pile cofferdam is easy to obtain; and the combined steel pile cofferdam is strong in integral structural rigidity and low in cost and is quick to construct.

Description

technical field [0001] The invention belongs to the field of deep water foundation construction, and relates to a cofferdam structure of civil engineering, in particular to a combined steel pile cofferdam. Background technique [0002] The cofferdam structure is a temporary structure in the construction of bridge foundations and hydraulic structures, and its function is to retain soil and water. When the water depth is shallow, soil bag cofferdams and wooden sheet pile cofferdams are generally used; in rivers with deep water and high flow velocity, steel sheet pile cofferdams, steel pipe pile cofferdams, and steel box cofferdams are generally used. [0003] Steel sheet pile cofferdam is the most commonly used form of cofferdam. Larsen steel sheet pile is a type of steel with hook lock. Steel sheet pile has the characteristics of light weight, convenient construction, reusability, and low cost. It has been widely used in construction. Domestically produced cold-formed Larse...

AI Technical Summary

Problems solved by technology

[0006] For the new-type fabricated combined steel pile cofferdam structure, if the hook-type lock of the outer welded plate band of the large-diameter steel pipe pile and the hook lock of the Larsen steel sheet pile are used to occlude and connect each other, the welded plate band during pile sinking construction The hook-shaped lock is easy to be deformed by force, and the hooks on both sides are not easy to be centered and straightly occluded. The strength and stiffness of the hook-type lock are low, and the waterproof performance is poor. The structure of the hook-type lock is not suitable for deep-water foundations. pile cofferdam

If the connection method of the C-shaped female buckle and the T-shaped male buckle of the lock steel pipe pile cofferdam is adopted, due to the low overall rigidity of the U-shaped steel sheet pile, it is difficult to lock the lock and align it straightly, resulting in the lock joint not being tightly occluded. Leakage will occur, affecting the construction environment

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