Water jet auxiliary rock breaking system and method carried on TBM

Abstract

The invention provides a water jet auxiliary rock breaking system and method carried on a TBM. The system comprises a water supply mechanism, a power mechanism and a transmitting and jetting mechanism. The water supply mechanism and the power mechanism are both arranged at the front end of a TBM complete machine first tackle connecting bridge; and the water supply mechanism provides a fluid sourceand filters and softens fluid, the power mechanism can apply pressure to the fluid, the fluid with certain pressure can enter the transmitting and jetting mechanism, the fluid is released at the tailend of the transmitting and jetting mechanism to the position of TBM cutterhead, high-pressure jet is formed, and TBM hob rock breaking is assisted. The system can deal with different kinds of waterjet target pressure and target flow by adjusting the integration number of pressurizing branches; the pressure of the fluid is adjusted through the arrangement of a safety valve and an air control unloading valve, and the transmission safety and the fluid pressure are guaranteed; through selection and paving of soft and hard pipes of fluid conveying pipelines, energy losses generated in the fluidconveying process are reduced to the maximum degree; and the overall design is safe, reliable and practicable.

Description

technical field [0001] The present disclosure relates to a water jet assisted rock breaking system and method mounted on a TBM. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] At present, rock tunnel excavation projects account for a very high proportion of deep buried long tunnel projects, and TBM construction schemes are usually adopted. The traditional TBM adopts mechanical rock breaking method. The principle is that under the joint action of normal force, rolling force and lateral force, the hob will press, roll and grind the rock, so that the rock will produce high stress areas and radial cracks. As the crack expands, rock fragments are formed to achieve the purpose of breaking the rock. [0004] When the tunnel boring machine (TBM) encounters hard rock with high confining pressure, its mechanical rock breaking ability is seriously...

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Problems solved by technology

Thirdly, when the jet pressure is positively correlated with the rock-breaking ability, the pressure loss caused by the change of direction, diameter and self-deformation of the pipeline during the high-pressure water transmission process must be considered, otherwise it will be difficult to ensure the assistance of the water jet to the hob. Effect

In addition, unlike the water jet system assembled in the laboratory, TBM, as a dynamic platform for the water jet auxiliary system, will encounter various factors that are difficult to estimate during construction, and the safety and reliability of the high pressure water jet auxiliary rock breaking system very severe

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