Sleeve tool for lengthening sounding pipe

The sleeve tool comprises a sleeve body, the upper end opening and the lower end opening of the sleeve body are each provided with a fixing end sleeve used for fixing the sounding pipe, external threads are formed in the surface of the sleeve body, strip-shaped holes are formed in the positions, located on the two sides of the middle of the sleeve body, of the sleeve body, and the strip-shaped holes are communicated with the fixing end sleeves. The sleeve main body is in threaded connection with connecting nuts at the upper end and the lower end of the external thread; the sounding pipe is connected in a plug-in mode and a locking mode, the problem that partial construction on a construction site is inconvenient can be effectively solved, binding and assembling can even be carried out in the environment that the construction space in a reinforcement cage is narrow, the situation that a traditional lengthening device needs to carry auxiliary equipment is avoided, and meanwhile the principle of green and enviro