A water jet nozzle device and its arrangement method suitable for assisting hobs in rock breaking

Abstract

The present invention provides a water jet nozzle device suitable for assisting hobs in breaking rocks and an arrangement method thereof. The device includes: a fixed base, which includes a fixed plate, a spring base and an adjusting pad; Nozzle, the center of the movable nozzle is provided with a water jet nozzle assembly, the outside 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 of hollow rectangular sliding sleeve; following the roller, the The following roller is fixedly connected to the outside of the sliding sleeve through a roller shaft, and the roller shaft can also be movably connected to a roller; a water jet pipeline, the water jet pipeline is located above the movable nozzle, and the water jet pipeline Including water jet pipe and abrasive hose; according to the situation, you can choose to arrange the water jet nozzle device on one side or both sides of the hob; the invention can greatly shorten the spraying distance between the water jet nozzle on the cutter head and the rock surface, and improve Water jet cutting effect and improve auxiliary rock breaking effect.

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...

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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.

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