Remanufacturing method of shield protection cutting tools

Abstract

A remanufacturing method of shield protection cutting tools belongs to a civil engineering art field. According to practical wear conditions of the shield protection cutting tools, the remanufacturing method of the shield protection cutting tools is characterized by remanufacturing the shield protection cutting tools through fully utilizing abandoned beck knives and on-site resources, saving steel and alloy of remanufacturing the shield protection cutting tools, prolonging service life of the shield protection cutting tools around shield cutterheads, providing guarantees for the shield protection cutting tools to drive successfully. The process of the remanufacturing method of the shield protection cutting tools comprises the following technological steps: (1) measuring the shield protection cutting tools, recording the shield protection cutting tools data, ensuing raw materials of utilizing the shield protection cutting tools, (2) confirming the height of the remanufacturing shield protection cutting tools, (3) making the remanufacturing shield protection cutting tools, (4) welding the remanufacturing shield protection cutting tools, (5) checking and accepting. Remanufacturing the abandoned beck knives into the shield protection cutting tools around the shield cutterheads has the advantages of saving economic costs and schedule costs, efficiently avoiding a series of construction risks caused by serious wear of the shield protection cutting tools in the specific strata.

Description

technical field [0001] The invention relates to a method of remanufacturing protective knives by making full use of discarded knives and on-site resources according to the actual wear and tear of the knives in the construction process of the subway shield, saving steel and alloys for the knives, and prolonging the service life of the knives around the shield cutter head , a method for effectively avoiding a series of safety risks caused by having to open a warehouse to change a tool due to severe wear of the tool, belongs to the technical field of civil engineering. Background technique [0002] The size of the shield cutterhead is as figure 1 As shown, the diameter A of the cutter head circle is 6250mm, and the cutter head is equipped with 1 or 2 cutters with the largest excavation diameter. The maximum excavation diameter B of the cutter head design is 30mm larger than the diameter A of the cutter head circle. [0003] Take the ZTE6250 shield machine as an example: the ma...

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Problems solved by technology

[0010] When the shield excavates in water-rich sandy gravel strata, top soft and bottom hard sandy conglomerate strata with high quartz content, the tool wear is more serious than other stratum conditions. When the surrounding tool wear reaches 12-15mm, the shield machine will not be able to advance normally. ; If the top is soft and the bottom is hard, the attitude of the shield will be uncontrollable and the advancement will be difficult, resulting in severe segment rupture; if it is a full-section hard rock formation, the shield will be stuck and cannot be advanced

[0011] During the shield tunneling process, after receiving the shield tunneling unit, the construction unit usually adopts the method of replacing the more worn tools to ensure the normal progress of the shield tunneling construction in the next stage. The replaced tools will be discarded directly, so there are often shell knives, Tooth knives, edge scrapers and gauge knives are replaced when they fail to reach or are close to reaching the scrap standard. The replacement of the knives will generate economic and schedule costs, but if they are not replaced in time, they will appear in the next shield construction process due to In the working conditions where the tool wear is serious and affects the construction, such as difficulty in advancing and difficult to control the posture, the construction unit can only use the method of opening the warehouse to replace the tool. This method will cause delays in the construction period and large economic losses. What is more serious is , there is a major safety risk and the resulting environmental risk when the tool is opened under pressure in an unstable formation

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