Shield cutter for composite ground

Abstract

The invention discloses a shield cutter for a composite ground, which comprises a cutter head with a box body structure, wherein a hobbing cutter is arranged on the front face of the cutter head and comprises a plurality of single-blade standard hobbing cutters, a plurality of single-blade central hobbing cutters, a plurality of single-blade standard hobbing cutters and a plurality of single-blade eccentric hobbing cutters; the single-blade standard hobbing cutters are arranged on a cross cutter beam; the single-blade central hobbing cutters are arranged on a transverse I-shaped cutter beam positioned in the central area of the cross cutter beam; the single-blade standard hobbing cutters and the single-blade eccentric hobbing cutters are arranged in an edge area of the cross cutter beam; cutting knives are symmetrically arranged along the two sides of the cross cutter beam in the form of a concentric circle; edge scraping knives are arranged on the two sides of the cross cutter beam and at the middle positions of every two cutter beams of the cross cutter beam, on the edge of the front face of the cutter head; a plurality of radius retaining knives are arranged at the periphery ofthe cutter head; and an over cutter extended from the periphery is arranged in a box body of the cutter head. When the shield cutter is compared with the prior art, the boundary dimension of a cutterholder is reduced, the aperture opening ratio of the cutter is increased, the slag flowability is improved, and the wear resisting property of the whole cutter is improved.

Description

technical field [0001] The invention belongs to shield equipment, and in particular relates to a shield cutterhead used in composite formations. Background technique [0002] Compared with other construction methods, shield construction has the advantages of high degree of automation, speed, safety, efficiency, and small impact on the surface environment, so it is widely used in various underground tunnel constructions. [0003] As one of the key components of the shield machine, the cutter head is mainly used to break and strip the rock and soil of the tunnel face and support the tunnel face. The structural form and opening ratio of the cutter head, the combination form and arrangement of the cutters, the reasonable design of the wear-resistant device of the cutter head and the foam nozzle are important guarantees for the efficient tunneling of the shield machine. [0004] After the rock and soil on the face of the tunnel is broken, it enters the soil bin through the openi...

AI Technical Summary

Problems solved by technology

The opening ratio of the existing shield cutter head is relatively small, generally no more than 30%, especially the opening area of ​​the center part is smaller; the overall wear resistance of the cutter head is poor; the hob cutter spacing is too large, generally 100mm, and the cutter spacing is The difference between the distribution radii of two adjacent knives when numbering is arranged; the hard alloy fixed on the cutting knife and the edge scraper for cutting rock and soil is small; the foam channel for soil improvement adopts a The pipeline is divided into two pipelines, which is easy to cause blockage of the foam nozzle. When the existing shield cutter head encounters a complex stratum with large changes in the geological conditions of the cross-section and longitudinal section of the tunnel section, due to the structure of the cutter head, the combination of the cutter, The layout of the knives and the design of the foam nozzle for soil improvement are not reasonable enough, and the phenomenon of abnormal wear and "mud cake" of the cutter head and knives often occurs, which seriously affects the efficiency of shield tunneling.

Images