Deep-water jacket skirt pile grouting is a critical step in ocean platform construction. Because of the complexity of the skirt pile structure and grouting pipeline, the calculation of grouting pressure and the contro...Deep-water jacket skirt pile grouting is a critical step in ocean platform construction. Because of the complexity of the skirt pile structure and grouting pipeline, the calculation of grouting pressure and the control of output pressure are involved. Beginning with the jacket skirt pile grouting construction scheme, grouting pressure is estimated on the basis of engineering fluid mechanics theory and variable frequency control technique. Programmable logic controller is the center of grouting pressure control system, which accomplishes the flow control of cement buffer tank, water buffer tank, additive buffer tank, cement metering tank, water metering tank, additive metering tank, mixer and agitator. Based on PROFIBUS-DP network, the output pressure of the slurry pump is controlled by the inverter. This method has been applied successfully in JZ20-2 Nor. high spot jacket platform construction.展开更多
Everyone experiences disambiguous feelings of location, of where the concrete world exists. Artists of every dicipline attempt to recreate this connection to real or ＂imagined communities＂ for their public. How do t...Everyone experiences disambiguous feelings of location, of where the concrete world exists. Artists of every dicipline attempt to recreate this connection to real or ＂imagined communities＂ for their public. How do they do this？ How do they bring about a deep and controled feeling in others for a particular location or imagined place？ By analyzing recollection and setting through objects, iconography, signifiers, and theoretical construct, attended by visual examples, a system of determinate mapping evolves展开更多
基金Supported by Key Research Project of China Offshore Oil Engineering Co,Ltd.
文摘Deep-water jacket skirt pile grouting is a critical step in ocean platform construction. Because of the complexity of the skirt pile structure and grouting pipeline, the calculation of grouting pressure and the control of output pressure are involved. Beginning with the jacket skirt pile grouting construction scheme, grouting pressure is estimated on the basis of engineering fluid mechanics theory and variable frequency control technique. Programmable logic controller is the center of grouting pressure control system, which accomplishes the flow control of cement buffer tank, water buffer tank, additive buffer tank, cement metering tank, water metering tank, additive metering tank, mixer and agitator. Based on PROFIBUS-DP network, the output pressure of the slurry pump is controlled by the inverter. This method has been applied successfully in JZ20-2 Nor. high spot jacket platform construction.
文摘Everyone experiences disambiguous feelings of location, of where the concrete world exists. Artists of every dicipline attempt to recreate this connection to real or ＂imagined communities＂ for their public. How do they do this？ How do they bring about a deep and controled feeling in others for a particular location or imagined place？ By analyzing recollection and setting through objects, iconography, signifiers, and theoretical construct, attended by visual examples, a system of determinate mapping evolves
