TBM cutter head with cavitation jet assisted rock breaking and rock breaking method

A technology of cavitation and cutter head, which is applied in the direction of earthwork drilling, mining equipment, tunnels, etc., can solve the problems that the tunnel construction period cannot be well guaranteed, the cost of tunnel excavation increases, and the excavation speed decreases, so as to improve the performance of rock breaking Efficiency, optimum rock breaking, and reduced wear

Inactive Publication Date: 2020-03-27
CHINA RAILWAY ENGINEERING EQUIPMENT GROUP CO LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the excavation process, if an extremely hard rock area is encountered, the tool will be severely worn and damaged, and the excavation speed will also be affected and greatly reduced
In this case, many cutting tools are damaged

Method used

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  • TBM cutter head with cavitation jet assisted rock breaking and rock breaking method
  • TBM cutter head with cavitation jet assisted rock breaking and rock breaking method
  • TBM cutter head with cavitation jet assisted rock breaking and rock breaking method

Examples

Experimental program
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Effect test

Embodiment 3

[0033] Example 3, such as Figure 4 Shown, a kind of rock-breaking method of the TBM cutter head of cavitation jet assisting rock-breaking, specifically as follows:

[0034] S1: When the TBM cutter head is rotating, the center hob 2 and the front hob 3 rotate to form multiple concentric cutting tracks, and the water jet is delivered to the cutter head area through the rotary joint, and flows into the cavitation jet nozzle through the high-pressure water pipe;

[0035] S2: The cavitation jet nozzle located on the front side of the movement direction on the same concentric cutting track ejects cavitation jet to erode the hard rock surface and reduce various properties of the rock;

[0036] S3: After the cavitation jet erodes the hard rock surface to a certain extent, the central hob 2 and the front hob 3 carry out the hob breaking of the rock, forming the main damage to the rock mass;

[0037] S4: After the rock is broken by the hob, the cavitation jet nozzle located on the rea...

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Abstract

The invention discloses a TBM cutter head with cavitation jet assisted rock breaking and a rock breaking method. The rock breaking efficiency of the TBM cutter head is improved. The cutter head comprises a cutter head body, wherein a central hob and positive hobs are arranged on the cutter head body, and the cutter head further comprises a cavitation jet mechanism, wherein a cavitation jet nozzleof the cavitation jet mechanism is arranged on the cutter head body and corresponds to the center hob and the positive hobs, the cavitation jet mechanism comprises the cavitation jet nozzle and a cavitation device, the cavitation jet nozzle is vertically arranged on the front face plate of the cutter head body, and the cavitation jet nozzle is connected with the cavitation device through a high-pressure water pipeline. According to the TBM cutter head, a cavitation jet rock breaking device for assisting cutting hard rock is additionally arranged on the conventional cutter head, through cooperation of the cavitation jet nozzle and the hobs, the cavitation jet is utilized to have strong damage to the extremely hard rock, various performances of the rock can be weakened, the rock is subjectedto double crushing, and the rock breaking efficiency of the cutter head is improved.

Description

technical field [0001] The invention relates to the technical field of extremely hard rock drilling and excavation, in particular to a TBM cutter head and a rock breaking method assisted by cavitation jets. Background technique [0002] In recent years, with the rapid development of large-scale projects such as high-speed railways, urban subways, and mining, more and more tunnels are being planned and constructed, and many safe and reliable TBMs have been widely used in hard rock tunneling. Compared with the traditional artificial drilling and bursting, this tunneling method has greatly improved the safety and tunneling speed. However, during the excavation process, if it encounters extremely hard rock, the cutter will be severely worn and damaged, and the excavation speed will be affected and greatly reduced. In this case, many cutting tools are damaged when excavating a short distance and have to be changed. Too frequent TBM tool changing operations will not only greatly ...

Claims

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Application Information

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IPC IPC(8): E21D9/10
CPCE21D9/10E21D9/1006E21D9/1066
Inventor 李建斌夏毅敏贺飞齐志冲
Owner CHINA RAILWAY ENGINEERING EQUIPMENT GROUP CO LTD
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