Device for preventing and treating cutterhead mud cakes in strong weathered red sandstone stratum and method

Abstract

The invention discloses a device for preventing and treating cutterhead mud cakes in a strong weathered red sandstone stratum. A soil bin is arranged behind a cutterhead, 1-3 circles of reserved ballvalves are mounted on a partition plate of the soil bin, 2-6 reserved ball valves can be mounted in each circle, the centers of the reserved ball valves in each circle are positioned in the same circumferential surface, the circumferential surface is coaxial with a rotation center, the reserved ball valves communicate with one outlet of a drainage and pressure relief pipeline, an inlet of the drainage and pressure relief pipeline communicates with an ultrahigh-pressure cleaning machine, and the other outlet of the drainage and pressure relief pipeline communicates with a collecting system. Thedevice is adopted to carry out high-pressure flushing on the central part of the cutterhead with mud cakes, flushed water and slag are discharged to a collecting system through a third steel pipe, the normal tunneling state of a mud-cake-free shield tunneling machine in center of the cutterhead is ensured, and the device can be popularized and applied to the technical field of equipment or devices for preventing and treating the mud cakes on the cutterhead.

Description

technical field [0001] The invention belongs to the technical field of equipment or devices for preventing and treating mud cake on the cutter head of a shield machine, and in particular relates to a device for preventing and treating mud cake on the cutter head of a shield machine in a strongly weathered red sandstone stratum and using the device to treat mud cake on the cutter head cake method. Background technique [0002] During the construction of the urban subway shield tunnel, the shield machine passes through the 4-2-1 strongly weathered sandstone formation and the 4-2-2 moderately weathered sandstone formation (sandstone is orange-red, fine-grained, layered, and muddy) When the mineral composition of the formation is mainly quartz, the diagenesis is poor, and the mechanical properties of the natural state are good, and it is easy to disintegrate in the shape of loose sand after being immersed in water or disturbed, and it is very easy to weather after being exposed ...

AI Technical Summary

Problems solved by technology

[0004] 1. Inject the dispersant into the cutter head panel or the soil bin, and after soaking for 48 hours, turn the cutter head forward and reverse to complete the cleaning of the slight "mud cake" on the cutter head; the disadvantage of this method is that the rotation of the cutter head has a negative Too much disturbance; too long soaking time will affect the stability of the face and the surrounding soil, and collapse accidents are prone to occur; the injected dispersant is easy to spread around and cannot accumulate between the cutter head and the face for a long time. Difficult to play a role in bubbling

[0005] 2. The high speed of the cutter head and small thrust can complete the cleaning of the slight "mud cake" on the cutter head; the disadvantage of this method is that the rapid rotation of the cutter head affects the stability of the drill surface and the surrounding soil, and collapse events are prone to occur; the thrust is small , the cutter head rotates fast, easy to over dig

[0006] 3. Use the method of opening the warehouse under pressure to complete the cleaning of the "cutter mud cake"; the disadvantage of this method is that the cost is too high, the risk factor is too high, the pressure of the soil warehouse is not easy to control during operation, and the physical fitness requirements of the personnel entering the warehouse are relatively high , the preparatory work is too cumbersome, and the construction period is uncontrollable

[0007] To sum up, it is difficult to solve the problem of "knife plate mud cake" cleaning in a short period of time with low cost and safety by the existing technological methods

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