Shield-carried noncontact frequency-domain electrical real-time advanced detection system and method

Patent metadata

Field	Value
Publication number	US-10260345-B2
Application number	US-201615323284-A
Country	US
Kind code	B2
Filing date	Apr 21, 2016
Priority date	Mar 31, 2016
Publication date	Apr 16, 2019
Grant date	Apr 16, 2019

Abstract

A shield-carried noncontact frequency-domain electrical real-time advanced detection system and method are provided. Noncontact electrodes are installed on a cutter head of a shield tunneling machine, current is emitted and received using capacitance coupling, the electrodes are connected to a host via a multi-way swivel joint, measured data is inversed and interpreted in real time, and the prediction result is transmitted to a control system of the shield tunneling machine so as to provide a technical support for safety construction of the shield tunneling machine; the noncontact electrodes are installed on the shield cutter head. Real-time advanced detection of geology in front of a tunnel face can be realized in the tunneling process, so that the requirement for quick tunneling construction is met, and the efficiency of advanced geological detection of the shield tunneling machine is improved; and an electrode system is only installed on the cutter head.

First claim

The invention claimed is:

1. A shield-carried noncontact frequency-domain electrical real-time advanced detection system, comprising a noncontact electrode unit, a multi-way swivel joint, an electrode positioning unit, a power supply and measurement unit and a control unit, wherein the noncontact electrode unit comprises a plurality of noncontact electrodes arranged on a front panel of a cutter head and is used for array-type multi-way information acquisition, the electrode positioning unit is arranged in a middle portion of a rear panel of the cutter head and used for determining rotating positions of the noncontact electrodes for real-time positioning;
the multi-way swivel joint is arranged behind the cutter head, a connection cable for each noncontact electrode is converged to a multi-core cable, the power supply and measurement unit outputs multi-way frequency-domain current and acquires signals, and the control unit is connected with the power supply and measurement unit and used for acquiring data of the noncontact electrodes and positions of the electrodes on the cutter head according to different set frequency domains and then performing three-dimensional inversion and interpretation.

2. The shield-carried noncontact frequency-domain electrical real-time advanced detection system according to claim 1 , wherein the power supply and measurement unit is further connected with fixed electrodes, and is used for emitting multi-frequency current and acquiring measured signals under the control of the control unit and acquiring potential differences between the noncontact electrodes and the fixed electrodes.

3. The shield-carried noncontact frequency-domain electrical real-time advanced detection system according to claim 1 , wherein the noncontact electrodes comprise noncontact power supply electrodes and noncontact measuring electrodes, the noncontact power supply electrodes are arranged on the outer side of the cutter head and connected with the power supply and measurement unit to output multi-way frequency-domain current, and the noncontact measuring electrodes are arranged on the inner side of the power supply electrodes to realize arrayed measuring electrode acquisition.

4. The shield-carried noncontact frequency-domain electrical real-time advanced detection system according to claim 1 , wherein each noncontact electrode comprises an electrode plate, the surface of the electrode plate is wrapped by a metal oxide film, the electrode plate is located in a frame housing formed by an insulating wear resistant material, a cable fixing column is arranged on the back of the electrode plate, and a rubber plug is arranged on the circumference of the cable fixing column.

5. The shield-carried noncontact frequency-domain electrical real-time advanced detection system according to claim 1 , wherein the electrode positioning unit is a rotary coder comprising a grating type euphotic coded disc and a photoelectric processing circuit, and the photoelectric processing circuit determines the positions of the noncontact electrodes via angular displacement and angular speed of the grating type euphotic coded disc, so that the rotating displacement of the cutter head is realized, and then the noncontact electrodes on the cutter head are positioned.

6. The shield-carried noncontact frequency-domain electrical real-time advanced detection system according to claim 5 , wherein a rotating shaft is arranged in the center of the grating type euphotic coded disc, euphotic gratings are uniformly distributed at the edge of the grating type euphotic coded disc, a light emitting device is arranged on one side of the grating type euphotic coded disc, the light emitting device and the noncontact electrodes rotate with the cutter head of the shield tunneling machine, and secondary gratings and a photosensitive device are arranged on the other side of the grating type euphotic coded disc; and light emitted by the light emitting device penetrates through the gratings of the grating type euphotic coded disc and the secondary gratings and is received by the photosensitive device.

7. The shield-carried noncontact frequency-domain electrical real-time advanced detection system according to claim 6 , wherein the connection cables of all the noncontact electrodes are placed inside the rotating shaft.

8. The shield-carried noncontact frequency-domain electrical real-time advanced detection system according to claim 1 , wherein the multi-core cable comprises multiple metal leads, each metal lead is wrapped by an insulating layer, all the metal leads are wrapped by a braided layer, and the braided layer is wrapped by a jacket.

9. The shield-carried noncontact frequency-domain electrical real-time advanced detection system according to claim 1 , wherein the multi-way swivel joint comprises a rotor and a stator, the rotor is movably connected to the stator, a plurality of passages are distributed on the rotor along the central circumference, the connection cables of the noncontact electrodes are arranged in the passages, a cable passage for bearing the multi-core cable is formed in the center of the stator, and the connection cables respectively correspond to the metal leads of the multi-core cable one by one inside the stator via slip rings.

10. The shield-carried noncontact frequency-domain electrical real-time advanced detection system according to claim 1 , wherein the power supply and measurement unit comprises a multi-frequency power supply output module, a multi-way acquisition and reception module and a control module, wherein the control module controls the operations of the multi-frequency power supply output module and the multi-way acquisition and reception module and is connected with a display module; the multi-frequency power supply output module comprises a sinusoidal oscillator and a singlechip, the singlechip controls the sinusoidal oscillator to output alternating current of corresponding waveforms, then electrical energy is provided to the power supply electrodes, and multi-frequency current is thus output; the sinusoidal oscillator is connected with a circuit amplifier; and the control module is further connected with a voltage and current measuring module, an overvoltage and overcurrent protection module and a data acquisition module.

11. The shield-carried noncontact frequency-domain electrical real-time advanced detection system according to claim 10 , wherein the multi-way acquisition and reception module specifically comprises a data sampling module, an input protection module, wave traps, a rectifier filter and an A/D converter, wherein the input protection module is connected with the measuring electrodes of the fixed electrodes and the noncontact electrodes, the potential of each measuring electrode is measured via the data sampling module, the wave traps, the rectifier filter and the A/D converter in sequence, and the potential differences between the measuring electrodes of the noncontact electrodes and the fixed electrodes are obtained; and the A/D converter is connected with the control module.

12. The shield-carried noncontact frequency-domain electrical real-time advanced detection system according to claim 1 , wherein the control unit comprises a control host and an inversion module, the control host is connected with the control module and the multi-way acquisition and reception module, receives the potential differences between the measuring electrodes of the noncontact electrodes and the fixed electrodes and simultaneously receives position information of the cutter head transmitted by the electrode positioning unit, and the control host sets the acquisition frequency domain; and the inversion module inver

Assignees

• Univ Shandong

Inventors

• Li Shucai
• Nie Lichao
• Liu Bin
• Liu Haidong
• Ren Yuxiao
• Song Jie
• Liu Zhengyu
• Guo Qian
• Wang Chuanwu

Classifications

• G01V3/26

  operating with magnetic or electric fields produced or modified either by the surrounding earth formation or by the detecting device (with electromagnetic waves G01V3/30) · CPC title

• G08C23/04

  using light waves, e.g. infrared · CPC title

• E21D9/003 Primary

  Arrangement of measuring or indicating devices for use during driving of tunnels, e.g. for guiding machines · CPC title

• E21D9/0621

  Shield advancing devices · CPC title

• E21D9/004 Primary

  using light beams for direction or position control · CPC title