Abstract
This paper is concerning about underwater concrete method using concrete pumping and casing pipe. This method is reliable and popular in the field of construction of port and fishery harbor facilities. Most essential code i. e. mix proportion, the way of placement and so on, is declared at “STANDARD SPECIFICATION FOR CONCRETE STRUCTURES-2002, Materials and Construction”edited by JSCE, and “MANNUAL FOR UNDER SEAWATER CONCRETE”supervised by Hokkaido Development Agency. Though the first-setting distance between casing pipe and surface of rabble mound is one of the most important factors to prevent segregation in water, it is not described in them. To clarify the distance, the placing concrete tests using concrete pumping and casing pipe, wewe carried out with good precision.According to these experiments, the paper addresses that the appropriate distance can be about 6cm.
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