Breathing type shield scraper with wear-resisting function

Abstract

The invention discloses a breathing type shield scraper with a wear-resistant function, and belongs to the field of shield cutters. According to the breathing type shield scraper with the wear-resistant function, the liquid outlet amount of improvement liquid can be reduced when the soil of a soil layer is improved by using the improvement liquid and the soil of a rock wall is soft and the scraper is worn slightly, and the liquid outlet amount of the improvement liquid can be increased when the soil of the rock wall is hard and the scraper is worn severely. A breathing bag (3) is similar to the lung of organisms, the supplement of the improvement liquid is a lung inspiration process while the discharge of the improvement liquid is a lung expiration process, the whole process is completely automatic, additional power does not need to be added, the situation that the excessive improvement liquid is sprayed is avoided, too humid tunneling environment cannot be caused easily, normal work of workers cannot be affected, the loss of the shield scraper in the tunneling process is greatly reduced, the shield scraper does not need to be frequently replaced, and the use cost of a shield tunneling machine is reduced.

Description

technical field [0001] The invention relates to the field of shield cutting tools, in particular to a scraper for a breathing shield with a wear-resistant function. Background technique [0002] A shield machine is a tunnel boring machine that uses the shield method. The shield construction method is the "shield" that the roadheader builds the tunnel while digging. It is different from the open construction method. Internationally, the generalized shield machine can also be used in rock formations, but it is different from the open tunnel boring machine. In our country, it is customary to call the tunnel boring machine used in soft ground as shield machine, and the one used in rocky ground as TBM. [0003] The shield machine is a kind of expensive construction machinery, and it needs a construction company with sufficient economic strength to use it. Compared with the high manufacturing cost of the shield machine itself, the cost of using the shield machine is not much lowe...

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Problems solved by technology

[0003] The shield machine is a kind of expensive construction machinery, and it needs a construction company with sufficient economic strength to use it. Compared with the high manufacturing cost of the shield machine itself, the cost of using the shield machine is not much lower. A continuous excavation distance designed for machine work is usually 2-3 kilometers away, but only in the above-mentioned excavation records, the shield machine usually needs to replace various types of tools at a cost of tens of millions, which further increases the use of the shield machine cost

[0004] In order to reduce the wear rate of the shield machine tool, the improvement liquid is usually sprayed on the rock surface to be excavated during the excavation process of the shield machine. The main component of the improvement liquid is bentonite mixture. , high adsorption and good self-sealing performance, so when the sodium-based bentonite solution is injected into the soil cabin, it can play the main role of: increasing the fluidity of the soil in the soil cabin, and cutting the soil when the cutter head rotates A mud film is formed on the face of the tunnel to protect the wall, which is beneficial to maintain the soil pressure balance in the soil cabin. However, the continuous spraying of soil improvement fluid will cause the overall humidity in the excavation hole of the shield machine to be relatively high, which will affect the already bad environment. The working environment of the roadheader has an impact on the life and health of the staff

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