MAINTENANCE METHOD OF FROZEN SOIL AND CONSTRUCTION METHOD OF FROZEN SOIL

摘要

To provide a maintenance method of frozen soil and a construction method of frozen soil which can construct frozen soil in a short period and which can properly maintain frozen soil thickness by preventing thawing and excessive formation of a frozen soil.SOLUTION: A plurality of freezing pipes 5 are arranged on a freezing pipe arrangement line 3 on a ground 1. A horizontal freezing pipe 15 is disposed on a ground surface 1a near the freezing pipe arrangement line 3 as freezing promotion means for preventing temperature increase in the vicinity of the ground surface 1a, and a heat insulation material 17 is laid thereon. A freezing coolant is circulated inside the plurality of freezing pipes 5 with using the freezing promotion means, and frozen soil 11 is constructed so as to construct a frozen soil type impervious wall. Then, a thickness of the frozen soil 11 is estimated based on an underground temperature measured at a position of a temperature measuring pipe 7, and the frozen soil type impervious wall 9 is maintained and managed by using freezing suppression means such as an intermittent operation of the freezing pipe 5 in a section where the thickness is determined to be larger than a predetermined thickness 18 and using the freezing promotion means in a section where the thickness is determined to be smaller than the predetermined thickness..SELECTED DRAWING: Figure 2