| 摘要 |
The present invention relates to a structure of slackening type blasting method and mat for excluding a part of sloping surface formed by base rock layer at one side or both sides of road upon establishing or expanding of the road or for excavating a part of middle portion of base rock layer made of non-free surface, and the invention is a slackening type blasting method which makes base rock layer of blasting region to be cracked whereby slackening from mother rock comprising : a blasting hole piercing step ; a blasting lead wire connecting step ; a blasting mat providing step which provides a steel plate member having a magnitude capable of covering whole of multiple blasting holes formed at each blasting region connected with said blasting lead wire, and a blasting mat of weight material in which elastic member surrounding around blasting holes of blasting region is attached to bottom portion of said steel plate member and weight reinforcing member made of I type or H type beam being a weight material is welded in grid shape at top surface ; and a blasting step for blasting an explosive by operating by blasting a blasting means connected with blasting mother line drawn out of blasting region provided with said blasting mat.
|
