Mumcrical Analysis Of Mechanical Characteristics For Double-wall Steel Colferdam Of Pile Cap In Deep Water

With the development of construction technology and mechanic about deep-waterfoundation, the steel casing cofferdam had being applied widely for construction of lowpile cap. However, the traditional design methods are usually stress analysis of variouscomponents, which is designed according to the bearing capacity. Then, composed ofcomponents assembled the whole cofferdam structure. It can not accurately checkingthe external loads acting on the overall structure by using safety assumptions andsimplified structure model. It will inevitably lead to the use of unreasonable in thematerial and there are security risks in the structure. Against this background, it has animportant guiding significance to use the finite element principle to analysis overalldesign and construction for cofferdam structure.This paper collected domestic and foreign steel cofferdam construction and designinformation. Introduced the development of Bridge-deep water foundation and describesthe application status of cofferdam. At the same time, summarizes the characteristics ofvarious structural, combined with the form of sham basis of low-pile foundation inHuai-he River bridge.Focuses on the application of double-wall steel cofferdam in theBridge-deep water foundation. Second, it introduces the basic principles of finiteelement and finite element analysis software MIDAS structural model of thedouble-wall steel cofferdam. Derivation calculation of the construction process may befaced with a variety of outside under the load combination. Consider the combinationof of various external loads such as the hydrostatic pressure, the earth pressure,hydrodynamic pressure, wave pressure and the pressure of subsea-concrete. Toaccurately simulate the calculation conditions of the sinking in pace, the end of subsealing concrete construction, the end of pumping preconstruction and the end of thepile cap construction, under the loads in line with the real environment. Furthermore,research on stress and deformation analysis of the cofferdam. Through the analysis wemay discover that the weakest part of the structure in the design, and can be targeted totake appropriate measures to enhance.This paper research on stress analysis of steel cofferdam as a whole structure,improved the accuracy, and provides a basis for the design and construction. Meanwhile,according to the Huai-he river basin over the years the water level changes caused byexternal load changes the theoretical assumptions. Explored the cofferdam design waterlevel reached its highest water level of the structure to withstand the ultimate loadcapacity obtained cofferdam reaches the yield limit state under the first componentposition. The results show that the finite element method to calculate the large-scaleconstruction structure has a strong practical significance.