FROZEN SOIL THICKNESS CONTROL METHOD, FROZEN SOIL THICKNESS CONTROL SYSTEM, AND TEMPERATURE MEASURING TUBE

To provide a frozen soil thickness control method, a frozen soil thickness control system, and a temperature measuring tube capable of suppressing excessive freezing in a predetermined range of frozen soil.SOLUTION: A frozen soil thickness control system 2 comprising a freezing tube 3 installed on the ground 1, a freezing device 4 that circulates a freezing refrigerant in the freezing tube 3, an electromagnetic wave generator 5, and a plurality of antennas 6 for irradiating the ground 1 spaced apart from the freezing tube 3 by a predetermined distance with electromagnetic waves generated by the electromagnetic wave generator 5, is formed in the ground 1. Also, a temperature measuring tube 7 capable of measuring the thickness of a frozen soil 8 and emitting electromagnetic waves is installed on the ground 1. The temperature measuring tube 7 has a temperature sensor 11 for temperature measurement and the antenna 6 for irradiating electromagnetic waves arranged inside a tubular body 10. Electromagnetic waves generated by the electromagnetic wave generator 5 are applied to the ground 1 to heat the vicinity of a target formation surface 15 of the frozen soil 8, thereby suppressing the growth of the frozen soil 8 beyond the target formation surface 15.SELECTED DRAWING: Figure 3 【課題】凍土の所定の範囲において過剰凍結を抑制できる凍土厚の制御方法、凍土厚の制御システムおよび測温管を提供する。【解決手段】地盤１に設置される凍結管３と、凍結管３に凍結冷媒を循環させる凍結装置４と、電磁波発生装置５と、電磁波発生装置５から発生した電磁波を凍結管３から所定距離離間した地盤１に照射する複数のアンテナ６と、を具備する凍土厚制御システム２を地盤１に形成する。また、凍土８の厚さを測定するとともに電磁波を照射可能な測温管７を地盤１に設置する。測温管７は、管体１０の内部に、測温用の温度センサ１１と、電磁波を照射するためのアンテナ６が配置される。そして、電磁波発生装置５で発生させた電磁波を地盤１に照射して凍土８の目標形成面１５の近傍を加熱し、凍土８が目標形成面１５を超えて成長することを抑制する。【選択図】図３