8-shaped double-wall steel cofferdam and construction operation process

Abstract

The invention discloses an 8-shaped double-wall steel cofferdam and a construction operation process. The cofferdam consists of an inner wall plate, an outer wall plate, compartment plates, a horizonal inclined support, an inner annular plate, an outer annular plate, vertical ribs, a vertical box, edge feet, a steel pipe inner support and bottom sealing concrete, wherein the inner wall plate, theouter wall plate and the vertical box form a main body of the 8-shaped double-wall steel cofferdam; the vertical ribs are respectively welded at the inner sides of the inner wall plate and the outer wall plate; in addition, the inner wall plate and the inner annular plate are welded into a whole; the outer wall plate and the outer annular plate are welded into a whole; the horizonal inclined support is welded between the inner annular plate and the outer annular plate; the inner wall plate and the outer wall plate are separated by a plurality of compartment plates; the edge feet are arranged at the bottoms of the inner wall plate and the outer wall plate; sandwich concrete is filled an inner cavity of the inner wall plate and the outer wall plate; and a water stop plate is arranged in a contact position of the bottom of the inner wall plate and the bottom sealing concrete. A series of problems of a common-use double-wall steel cofferdam during the construction process of a bearing table with great length-width ratio can be well solved; and the goals of safety, economical performance, cost reduction and efficiency improvement are achieved.

Description

technical field [0001] The invention relates to the field of cofferdam construction, in particular to an eight-shaped double-wall steel cofferdam and a construction operation process. Background technique [0002] Steel cofferdam refers to the temporary enclosure steel structure built for the construction of permanent water conservancy facilities in the construction of water conservancy projects. Its function is to prevent water and soil from entering the construction site of the building, so as to drain water in the cofferdam, excavate the foundation pit, and build the building. [0003] Common steel cofferdams include steel sheet pile cofferdam, locking steel pipe pile cofferdam, double-wall steel box cofferdam, single-wall steel box cofferdam and steel hanging box cofferdam. [0004] 1). Steel sheet pile cofferdam: It is mainly suitable for water and soil retaining facilities during the excavation of small and medium-sized foundation pits with base depths of 6-8m. At pr...

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Problems solved by technology

[0010] The circular structure bears even force, and the components are easy to be standardized. However, for the construction of caps with a large ratio of length and width, the distance between the outer walls of the river center side of the circular cofferdam is long, and the implantation and subsidence on the underwater inclined bank are unstable. , the earth pressure on the bank side is high, and it is easy to be limited by the stable slope angle and the layout of nearby temporary structures. When the underwater bank slope does not have the conditions for large-scale leveling, its use will be limited

At the same time, most of the space is redundant, which will cause unnecessary waste of raw materials, increase costs, reduce work efficiency, occupy a large area of ​​water area, and cause inconvenience for ships to pass. The schematic diagram is as follows figure 1 shown

[0011] Rectangular double-walled steel cofferdams with round ends can adapt to the shape of the cap to the greatest extent for the construction of caps with a large ratio of length and width. There are many internal supports, the distance between the ring plates is small and the number is large enough to meet the force requirements, the workload of butt welding of the ring blocks is large, and the installation speed is slow

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