| 摘要 |
PURPOSE:To enable the structure of a vessel whose wall portion is made of concrete to be a large-scale, simple and inexpensive one by installing insulation composed of firestone as raw material on the internal surface of the said wall. CONSTITUTION:On a concrete foundation portion formed on foundation piles a cylindrical concrete vessel is further constructed with pressed concrete. Since a reinforced concrete wall portion 13a of the vessel is thermally protected by insulation 15 from pressure hot water reserved inside and kept at a sufficiently low temperature, the integrity of concrete vessel is maintained. Further, since it is not necessary to protect the insulation by providing an isopiestic region consistent with hot water reserved, the structure can be simplified and consequently the construction can be achieved at a low cost. Coating the insulation 15 with a liner 17 as occasion arises, makes such a desirable effect that the insulation 15 is protected from the influence due to variations of internal temperature and pressure in the vessel as well as that the hot water can be kept clean to the utmost extent.
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