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The Slip Capacity and Seal Structure Research of Expansive Stressed Grouted Clamps

Author: ChengYang
Tutor: ShiXiang
School: Ocean University of China
Course: Hydraulic Engineering
Keywords: repairing and strengthening expansive stressed grouted clamp CSAⅡ expansive agent seal structure model test
CLC: P754
Type: Master's thesis
Year: 2013
Downloads: 25
Quote: 0
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Abstract


Expansive stressed grouted clamp is a new technique in repairing underwaterdamaged members of offshore structures. This type of clamp has the merits ofconvenient underwater installation and low cost. Based on the study of formerexpansive stressed grouted clamps, the following research works are carried out:Firstly, The clamps that used a new agent named CSAⅡ are researched. Theproperty of the expansive agent is an important factor that effects the slip capacity ofexpansive stressed grouted clamps. Analysis for the influence of CSAⅡon expansivepressure and slip capacity is carried out by the model experiments. It can beconcluded that CSAⅡ expansive agent can provide higher expansive pressure andslip stress than FEA agent when the content is above10%. The reliability of CSAⅡexpansive agent is better than FEA agent, so CSAⅡ expansive agent is more suitablefor clamps in repairing underwater damaged members of offshore structures.Secondly, the empirical formula for relationship between expansive pressure andslip stress that suitable for CSAⅡ expansive agent is proposed, and the empiricalformula for FEA expansive agent is modified. The empirical formula is based on thetest date and referenced on associated formula for relationship between pressure andslip stress which designed by MSL corporation that and Elnashai. The empiricalformulas of CSAⅡand FEA agent can fit the experimental dates very well, and theycan provide the theoretical basis for the engineering design on corresponding clamps.Thirdly, the seal structure of expansive stressed grouted clamps is improved. Theseal structure has two parts of the end seal and the axial seal. As the modulus ofelasticity of the rubber used in seal structure of clamps is much smaller than othermetal material,the strength of the seal structure is relatively weak. The region nearbythe seal structure is easy to generate swelling deformation that lead to the part loss of expansive stress, which will affect the slip capacity of structure. In this paper,threesmall baffles changed into an annular baffle in the end seal structure while a set ofbaffles are used between two saddles in the axial seal structure. By the modelexperiment, the research shows that the effect of the new end seal structure is veryobvious,but for the axial seal structure the effect is not very good. It need furtherresearch on its installation technology.In this paper, the type of agent and the seal structure are researched by modelexperiments. It shows that the CSA II agent can provide higher expansive pressurethan FEA agent and has good reliability, so it is more suitable for expansive groutedclamps in repairing underwater damaged members of offshore structures. Theimprovement of seal structure provide a right direction and thoughts for the laterresearch on improving the strength of clamps.

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