Small cutter head structure of quasi-rectangular shield and construction method of small cutter head structure

Abstract

The invention relates to a small cutterhead structure of a quasi-rectangular shield and a construction method of the small cutterhead structure. The small cutterhead structure comprises a fixing sleeve fixedly installed in the shield; the shell penetrates through the fixing sleeve and is internally hollow to form a containing space, and the end, away from the cutting face of the shield, of the shell extends out of the fixing sleeve; the length of the telescopic piece is adjustable, one end of the telescopic piece is fixed on the inner wall of the shield, and the other end of the telescopic piece is fixedly connected with the extending end of the shell; the end part, close to the cutting surface, of the rotating shaft protrudes out of the accommodating space; the motor is mounted in the accommodating space and is in driving connection with the rotating shaft; the cutter head is mounted at the protruding end of the rotating shaft, and the shell is driven to move back and forth along the fixing sleeve by adjusting the length of the telescopic part, so that the cutter head moves in the direction close to or away from the cutting face. The problem that the small cutterhead is prone to faults is effectively solved, the position of the small cutterhead is adjusted, so that the situation that axial force borne by the small cutterhead is too large is avoided, the fault probability of the small cutterhead is reduced, the construction efficiency is improved, and the construction progress is guaranteed.

Description

technical field [0001] The invention relates to the field of tunnel construction, in particular to a small cutter head structure similar to a rectangular shield and a construction method thereof. Background technique [0002] With the increasing demand for urban underground space, more and more shield machines are used in the construction of subway tunnels. Among them, the cross-section of the quasi-rectangular shield can include two subway tunnels up and down, which is different from the traditional construction of two circular shields. Compared with the method of cross-section tunnel, it has the characteristics of low construction cost, short construction period and good settlement control, so it has been widely used. [0003] The rectangular shield generally consists of two large cutter heads and two small cutter heads, and the two small cutter heads are located at the upper and lower parts of the section near the middle. , The small cutter head often fails, resulting in...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of the prior art, provide a small cutterhead structure similar to rectangular shield and its construction method, solve the problem that the small cutterhead is prone to failure, and adjust the position of the small cutterhead to avoid the small cutterhead being affected by the shaft. If the axial force is too large, the probability of failure of the small cutter head will be reduced, the construction efficiency will be improved, and the construction progress will be guaranteed.

Images