Water jet nozzle devices suitable for assisting hobs in rock breaking and arrangement method of water jet nozzle devices

Abstract

The invention provides water jet nozzle devices suitable for assisting hobs in rock breaking and an arrangement method of the water jet nozzle devices. Each device comprises a fixed base, a movable nozzle, a following idler wheel and a water jet pipeline; the fixed base comprises a fixed disc, a spring base and an adjusting base plate; the center of the movable nozzle is provided with a water jetnozzle assembly, the outer side of the water jet nozzle assembly is wrapped with a layer of hollow rectangular protective sleeve, and the outer side of the protective sleeve is wrapped with a layer ofhollow rectangular sliding sleeve; the following idler wheel is fixedly connected to the outer side of the sliding sleeve through an idler wheel shaft, and the idler wheel shaft is movably connectedwith an idler wheel; the water jet pipeline is located above the movable nozzle, and the water jet pipeline comprises a water jet pipeline body and an abrasive hos; and the water jet nozzle devices can be selectively arranged on one side or two sides of the hobs according to the situations. According to the devices and the method, the jet distance between the water jet nozzles on cutter heads anda rock face can be greatly shortened, the water jet joint cutting effect is improved, and the rock breaking assisting effect is improved.

Description

technical field [0001] The invention relates to a tunnel boring machine, in particular to a water jet nozzle device and an arrangement method for assisting a hob in rock breaking. Background technique [0002] TBM uses a hob to break rock, and when the hob breaks rock, the knife ring needs to be pressed into the rock to form cracks that expand and pass through the cracks on the adjacent hob tracks to break the rock. When this method encounters hard rock, especially extremely hard rock, due to the high hardness of the rock and good structural integrity, it is difficult for the hob to be pressed into the rock surface, or the indentation depth is small and the load is large, which can easily cause the hob to be overloaded. As a result, the knife ring wears quickly, breaks or chipping frequently; the tunnel excavation efficiency is very low, and the cost of tool wear is very high, which has become a major source of risk in TBM construction. [0003] The key to improving the eff...

AI Technical Summary

Problems solved by technology

[0004] The water jet cutting effect is greatly affected by the distance between the nozzle and the rock surface. The distance will cause the cutting depth to be shallow, and the large vibration and straightness difference will also lead to shallow cutting depth.

When the TBM cutter head is excavated, it vibrates a lot. The rock between the hob tracks penetrates and breaks through cracks. , the distance between the nozzle and the rock surface changes greatly with the vibration of the cutter head and the undulation of the rock surface, which seriously affects the cutting effect and further affects the rock breaking effect of the hob

[0005] Therefore, how to improve the cutting effect of the water jet nozzle installed on the TBM cutter head in the extremely hard rock formation has become a major problem restricting the application effect and promotion prospect of this technology.

Images