Novel rock breaking method and rock breaking hob

Abstract

The invention discloses a novel rock breaking method and a rock breaking hob and relates to the technical field of tunnel boring. The novel rock breaking method and the rock breaking hob are applied to the rock breaking operation of tunnels; the problems that a hob is seriously worn and is short in service life in the existing rock breaking method are solved. According to the chipping rock breaking method, an included angle beta is formed between a hob blade and a normal of a tunnel face; after the pressure is applied to the disc-shaped hob, the blade penetrates into rock and a dense kernel is generated at the front end of the blade; the dense kernel continuously expands to tear off surrounding rock and forms a breaking area; rocks on a dangling face are chipped by expanding the breaking area; the blade of the disc-shaped hob is mainly used for bearing a shear force; the strength of the shear force is 6-9 percent of the compressive strength of the rock. The chipping rock breaking method has the advantages that firstly, the hob blade is mainly used for overcoming the shear resisting strength of the rocks, the compressive strength of a hob single spindle is greatly reduced, the blade of a hob ring is slow in wear and the hob is long in service life; secondly, the chipping rock breaking method is high in rock breaking and high in tunneling efficiency and is particularly suitable for excavating and tunneling of full-section hard-rock geology; thirdly, consumed power of tunneling equipment is lower.

Description

technical field [0001] The invention relates to the technical field of tunnel excavation, in particular to a method for flaking and breaking rock and a rock-breaking hob suitable for flaking and breaking rock. Background technique [0002] Tunneling equipment is more and more widely used in the construction of underground projects such as subways, rail transit, and coal mine roadways. The disc-shaped hob installed on the cutter head of the tunnel excavation equipment is an important tool for breaking rocks during the excavation process. At present, the structure of the disc-shaped hob mainly includes the hob cutter ring, cutter hub, fastening cover, end cover, and cutter shaft. , bearings and seals. When the disc hob breaks the rock, it bears huge load and impact, and at the same time bears the severe friction of the rock, and produces a large amount of slag and gravel. The surface of the exposed parts of the disc hob is worn, especially the hob cutter ring and cutter hub,...

AI Technical Summary

Problems solved by technology

[0004] One of the purposes of the present invention is to provide a novel rock-breaking method, which is applied in rock-breaking operations in tunnels to solve the problems of severe hob wear and short tool life in existing rock-breaking methods; the second purpose of the present invention is to provide A rock-breaking hob suitable for a new rock-breaking method

Images