| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a potential rise spread restriction method which makes it possible to restrict the spread of potential rise in a ground electrode at the falling of a thunderbolt, requiring less labor and cost than in conventional technology. <P>SOLUTION: In a potential rise spread restriction method used to restrain a potential rise at a ground electrode on an induction side buried in the earth and having a lightning current flowing thereinto from spreading to a ground electrode on a non-induction side disposed around the ground electrode on the induction side, soil in a portion existing between the ground electrode on the induction side and the ground electrode on the non-induction side and separated from both ground electrodes is used as a soil improvement portion with relatively higher resistance than the earth existing in the vicinity. The soil improvement portion is formed, for example, in shape of the letter I, U or L or in shape of a cylinder in a plan view. <P>COPYRIGHT: (C)2013,JPO&INPIT |
