As an example, the design and construction technology of the anti-ship collision suspended steel cofferdam in Shanghai Changjiang River Bridge has been discussed. Design analysis shows that: by using the anti-ship collision suspended steel cofferdam the bridge pier can be protected and adopted lots of collision energy. At the same time, the collision injury degree of the vessel could be reduced. By using the finite element method, the deformation and strain state under the stage of construction and floating-transportation had been analyzed. Considering both the anti-ship collision and the construction, the anti-ship collision suspended steel cofferdam has been designed. In construction stage, the following methods had been developed: the integrally manufacturing method in factory, launching method to river in slideway, fioating-transportion method to the pier position in long distance and set-to-place method by synchronous lifting of two floating cranes. These results listed in this paper are beneficial to the design and construction of the anti-ship collision suspended steel cofferdam.
This paper contrastively analyses the consolidation instances of silt with HEC and HAS soil consolidators, also emphatically discusses the influence regularities of the compressive strength of solidified soil with the following factors: the dose of consolidators and the curing time. Meanwhile, from the point of view of experiment, this paper studies the physical and mechanical properties of solidified soil. Case study shows that HEC and HAS soil consolidators behave as well as cement and lime in road-construction engineering, and even that filling subgrade independently. Also, this paper proposes the appropriate value 6% of HEC and HAS soil consolidators for solidifying silt layer, which can be used as reference for the similar geological conditions.
Chongqing Chaotianmen Bridge is by far the world's largest three-span continuous half-through double-layer steel truss tied arch bridge. Risk evaluation and risk analysis are made to the bridge during construction period. At the same time, various measures are taken to avoid construction risks and accidents. The principal line of risk controls is clear with reasonable control measures. Chongqing Chaotianmen Bridge was completed and available for traffic on April 29, 2009, its various technical and quality indicators are in accordance with design and specifications.
By the laboratory tests of mixing proportion, this paper contrastively analyzes the consolidation instances of silt with HEC, HAS and cement, also emphatically discusses the influence regularities of the unconfined compression strength of solidified silt with the following factors such as the dose of consolidators and the curing time, which provide reliable data for situ tests. According to the test results in site, the optimum mixing proportion for consolidator-mixed pile is HAS with 12% dose. The result can be used as reference for the optimum mixing proportion design of consolidator-mixed pile composite foundation.
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