CONSTRUCTING METHOD OF UNDERGROUND TYPE STORAGE TANK

PURPOSE:To greatly reduce workload t shorten the term of work and to improve labor saving by utilizing a form bearing-base structure for placing roof concrete as it is as a working scaffolding while conducting the attaching operation of a side-section cold insulator and a membrane as jacking down the form bearing-base structure by stages. CONSTITUTION:A concrete roof 7 is formed in the constructing method of an underground type storage tank A, and a form bearing-base structure 4 for placing the concrete roof 7 is jacked down in required length and a working space 11 is constituted between the concrete roof 7 and the form bearing-base structure 4. A cold insulator 13 and a membrane 15 are annexed onto the internal surface of the concrete roof 7 and the side face of a concrete body 2 while using the form bearing-base structure 4 as a working scaffolding. Accordingly, the cold insulator 13 and the membrane [15 are attached in approximately the whole region from the upper section of the concrete body 2 to a lower section while the form bearing-base structure 4 is lowered successively by stages.