Method for detecting gas in cable working well

The invention relates to the field of safety monitoring, in particular to a method for detecting gas in a cable work well, which comprises the following steps: S1, a gas detection device is fixed at a well mouth, the gas detection device comprises a box body for fixing a negative pressure fan, a telescopic pipe for lowering into the well is arranged on the box body, and the telescopic pipe is connected with a suction port of the negative pressure fan; a sensor group is arranged on each telescopic joint of the telescopic pipe; s2, acquiring temperature, humidity and gas concentration information of different underground depths at set time intervals through a sensor group; and S3, calculating the underground comprehensive safety degree E according to the data obtained in the step S2. According to the method, the underground operation risk can be comprehensively judged, early warning is carried out on workers in advance, and underground safety accidents are avoided. 本发明涉及安全监测领域，具体是一种电缆工井内气体检测方法，包括如下步骤：S1、在井口处固定气