FREEZING CONSTRUCTION METHOD AND FREEZING PIPE

摘要

PURPOSE: To make the radial dimension of a freezing pipe or a triple pipe as small as possible. ;CONSTITUTION: At the time of freezing the ground G by injecting freezing mixture C, gas acting as a heat insulator is made exist or circulated in the part, corresponding to a non-freezing range A, of the radially outer block 18 of a triple pipe (freezing pipe) 10 to be inserted in a borehole, or this block is substantially kept in the vacuum state. The part 12B, corresponding to a freezing range B, of the outermost pipe (outer shell part) 12 of the triple pipe 10 is formed of material liable to break. After the completion of freezing work, the outermost pipe 12 of the triple pipe 10 can be also left buried in the ground without being pulled out.;COPYRIGHT: (C)1994,JPO&Japio