Large-diameter split type shield body machining method

Abstract

The invention discloses a large-diameter split type shield body machining method, and relates to the field of shield body machining. The large-diameter split type shield body machining method comprises the following steps that a workbench and eight supporting pier columns arranged in the circumferential direction of the workbench at intervals are arranged; four split-half shield bodies are hoisted to the eight supporting pier columns correspondingly to be supported, and the four split-half shield bodies are connected through bolts; a machining vertical lathe is fixed to the workbench to machine center rings of the four split-half shield bodies; an inverted-circular-truncated-cone-shaped supporting base is connected to the workbench, a machining vertical lathe is fixed to machine hinge sleeves at the tops of the four split-half shield bodies, a drilling machine is fixed to the workbench to drill threaded bottom diameter holes in the four split-half shield bodies, then the four split-half shield bodies are disassembled, a boring machine is lifted to mill flange end faces, flange end face holes are drilled in the flange end faces, and then lifting lugs are installed; and after the corresponding split-half shield bodies are turned over, a butterfly panel is milled. According to the large-diameter split type shield body machining method, the hoisting safety risk during shield body machining can be reduced, the machining time is shortened, and the machining efficiency is improved.

Description

technical field [0001] The present application relates to the field of shield body processing, in particular, to a method for processing a large-diameter split-type shield body. Background technique [0002] Due to the large diameter of the shield body of the shield machine, the overall structure cannot be realized in the rough production process, and the overall processing cannot be realized due to the limitation of the equipment processing capacity. Therefore, the existing front and center shields are all designed as The four-piece shield structure is used for processing. Although this structure achieves machinability, it poses new problems for machining in terms of ensuring processing quality, meeting pattern requirements and performance. [0003] At present, there are mainly two ways to process the flange position of the shield body in blocks. The first method is to manufacture the shield body in blocks first. After the structural welding is completed, the block flanges ...

AI Technical Summary

Problems solved by technology

[0002] Due to the large diameter of the shield body of the shield machine, the overall structure cannot be realized in the rough production process, and the overall processing cannot be realized due to the limitation of the equipment processing capacity. Therefore, the existing front and center shields are all designed as The four-piece shield structure is used for processing. Although this structure achieves machinability, it poses new problems for machining in terms of ensuring processing quality, meeting pattern requirements and performance.

[0003] At present, there are mainly two ways to process the flange position of the shield body in blocks. The first method is to manufacture the shield body in blocks first. After the structural welding is completed, the block flanges are processed and the mating surfaces are matched. The flatness and angle of the two flanges on the block are tested and drilled; the second method is to process the segmented flanges separately first, and then use a pair of two processed segmented flanges that fit each other with bolts and The code boards are connected and fixed together. After the welding of the shield body structure is completed, the mounting grooves of the segmented flanges are cut, and the segmented flanges are positioned and welded; In terms of end face processing, the existing processing method is mainly to hoist the shield body as a whole to a vertical lathe above 10 meters after the overall welding, process the notch ring and the center ring, and then turn it over and hoist the tail end face. At this time, the processing equipment requires hydraulic pressure. The workpiece rotary platform can bear a load of more than 150 tons, and it needs to use large-scale equipment to support and adapt to the processing of large-diameter shields, which greatly increases the processing cost

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