| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve a problem that, when manufacturing a circular ice floe and attaching it to an NS-shaped pipe socket in order to secure the elongation/contraction effective width of an anti-seismic pipe, the attachment is impossible due to the existence of a rock ring which causes the narrowing of the socket, and at the same time, a circular ice floe which allows the penetration of the rock ring is manufactured and inserted into the socket, however, there occurs wobbling, stability is not obtained, and so forth. <P>SOLUTION: Fan-shaped ice blocks are formed by trisecting the circular ice floe, so that the circular ice floe which is hard and hardly melted can be obtained by irradiating liquid carbon dioxide gases (-80°C in boiling point) to the connected fan-shaped ice blocks by attaching the fan-shaped ice blocks to a rock ring without trouble. <P>COPYRIGHT: (C)2012,JPO&INPIT |
