CN215728870U - Carrying type electric method advanced geological forecasting device - Google Patents
Carrying type electric method advanced geological forecasting device Download PDFInfo
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- CN215728870U CN215728870U CN202122307729.1U CN202122307729U CN215728870U CN 215728870 U CN215728870 U CN 215728870U CN 202122307729 U CN202122307729 U CN 202122307729U CN 215728870 U CN215728870 U CN 215728870U
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Abstract
The utility model discloses a carrying type electric method advanced geological forecasting device which comprises a main electrode and a shielding electrode carried on a shield machine, wherein the main electrode is arranged in front of a tunnel face, the shielding electrode is arranged in side direction of a tunnel, the carrying type electric method advanced geological forecasting device also comprises a return electrode connected with the ground outside the tunnel, the main electrode, the shielding electrode and the return electrode are all electrically connected with an acquisition communication system in the shield machine through leads, and the acquisition communication system is communicated with an upper computer through a network cable. The forecasting device disclosed by the utility model can be conveniently carried on a newly designed shield machine, a shield machine under construction and a shield machine reconstructed from an old machine, and the method disclosed by the patent can be used for realizing the advance forecasting of the poor geologic body in front of the tunnel face after the forecasting device is carried. The acquisition communication system can quickly realize the processing of the main electrode signals and the shielding electrode signals and transmit the forecast result to the notebook computer terminal in real time.
Description
Technical Field
The utility model belongs to the technical field of advanced geological forecast, and particularly relates to a carrying type advanced geological forecast device by an electrical method in the field.
Background
At present, shield method construction is increasingly adopted in tunnel engineering, and due to the fact that underground structures are complex, major safety accidents are easily caused once the shield method construction encounters large-scale karst caves, underground rivers and other unfavorable geologic bodies, and therefore it is necessary to carry an advanced geological prediction system capable of finding out relevant information of the unfavorable geologic body structures in advance on a shield machine.
In shield tunnel construction, an electric advanced geological prediction method is usually adopted to detect a water-containing unfavorable geological structure, however, the existing electric advanced geological prediction method and device need to transform a shield machine to a certain degree, so that the method is only limited to a newly designed shield machine and cannot be applied to the shield machine which is already put into use.
Disclosure of Invention
The utility model aims to solve the technical problem of providing a portable electric method advanced geological prediction device and method carried on a shield machine, which can meet the requirements of shield machines in tunnel field construction and old machine reconstruction of the shield machines on carrying the electric method advanced geological prediction device.
The utility model adopts the following technical scheme:
the improvement of the carrying type electric method advanced geological forecast device is that: the shield tunneling machine comprises a main electrode and a shielding electrode which are carried on the shield tunneling machine, wherein the main electrode is arranged facing the front of a tunnel face, the shielding electrode is arranged facing the lateral direction of a tunnel, the shield tunneling machine further comprises a return electrode which is connected with the ground outside the tunnel, the main electrode, the shielding electrode and the return electrode are all electrically connected with an acquisition communication system in the shield tunneling machine through leads, and the acquisition communication system is communicated with an upper computer through a network cable.
Furthermore, a welding spot is welded on a cutter head of the shield tunneling machine or near the cutter head to serve as a main electrode connecting point.
Furthermore, a welding spot is welded on a shield body of the shield machine to serve as a shielding electrode connecting point.
Furthermore, an earth anchor is externally used in the tunnel to be in contact with the ground to serve as a return electrode connection point.
Furthermore, the acquisition communication system comprises a preamplification unit, a band-pass filtering unit, an AD conversion unit, a digital signal processing unit, a result preprocessing unit and a correction processing unit which are electrically connected together in sequence, the main electrode, the shielding electrode and the return electrode are electrically connected with corresponding joints of the preamplification unit through leads, and the correction processing unit is communicated with an upper computer through a network cable.
Furthermore, the upper computer is a notebook computer.
The improvement of the method for the advanced geological forecast by the carrying type electrical method, which uses the device, is that: the whole cutter head of the shield machine is used as a main electrode to emit alternating currents with different frequencies to the front of the palm surface; the method comprises the steps that a shield body of a shield machine is used as a shielding electrode to laterally emit alternating currents with different frequencies to a tunnel; under the action of focusing, the alternating current emitted by the main electrode enters deeply into the front of the tunnel face; and obtaining an apparent resistivity curve and a percentage frequency effect curve by measuring the apparent resistivity and the frequency domain excitation parameters under different frequencies, and evaluating the integrity and the water-containing property of the rock stratum in front of the tunnel face.
The utility model has the beneficial effects that:
the device disclosed by the utility model can be conveniently carried on a newly designed shield machine, a shield machine under construction and a shield machine reconstructed from an old machine, and the method disclosed by the utility model can be used for realizing the advance forecast of the unfavorable geologic body in front of the tunnel face after carrying. The acquisition communication system can quickly realize the processing of the main electrode signals and the shielding electrode signals and transmit the forecast result to the notebook computer terminal in real time.
Drawings
FIG. 1 is a schematic view of the general structure of the apparatus disclosed in example 1 of the present invention;
fig. 2 is a schematic block diagram of an acquisition communication system in the apparatus disclosed in embodiment 1 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
Embodiment 1, as shown in fig. 1, this embodiment discloses a carried electric method advanced geological prediction device, which includes a main electrode 1 and a shielding electrode 2 carried on a shield machine, the main electrode is arranged facing the front of a tunnel face, the shielding electrode is arranged facing the lateral direction of a tunnel, the device further includes a return electrode 4 connected with the ground outside the tunnel 3, the main electrode, the shielding electrode and the return electrode are all electrically connected with an acquisition communication system 5 in the shield machine through leads, and the acquisition communication system is communicated with an upper computer through a network cable.
In the embodiment, a welding spot is welded at the cutter head of the shield tunneling machine or near the cutter head to be used as a main electrode connecting point (the main electrode is the cutter head). A welding spot is welded on a shield body of the shield machine to be used as a shield electrode connecting point (a shield electrode is a shield body). And a ground anchor is externally used in the tunnel to be in contact with the ground to serve as a return electrode connection point.
As shown in fig. 2, the acquisition communication system includes a pre-amplification unit 51, a band-pass filtering unit 52, an AD conversion unit 53, a digital signal processing unit 54, a result preprocessing unit 55, and a rectification processing unit 56, which are electrically connected together in sequence, wherein the main electrode, the shielding electrode, and the return electrode are electrically connected to corresponding connectors of the pre-amplification unit through wires, and the rectification processing unit is in communication with an upper computer through a network cable. The upper computer is a notebook computer, and the acquisition and forecast results are displayed at the notebook computer.
The embodiment also discloses a carrying type advanced geological prediction method by an electrical method, and by using the device, alternating currents with different frequencies are emitted to the front of the palm surface by taking the whole cutter head of the shield tunneling machine as a main electrode; the method comprises the steps that a shield body of a shield machine is used as a shielding electrode to laterally emit alternating currents with different frequencies to a tunnel; under the action of focusing, the alternating current emitted by the main electrode enters deeply into the front of the tunnel face; and obtaining an apparent resistivity curve and a percentage frequency effect curve by measuring the apparent resistivity and the frequency domain excitation parameters under different frequencies, and evaluating the integrity and the water-containing property of the rock stratum in front of the tunnel face.
Claims (6)
1. The utility model provides a carry-on type electric method advance geology predictor which characterized in that: the shield tunneling machine comprises a main electrode and a shielding electrode which are carried on the shield tunneling machine, wherein the main electrode is arranged facing the front of a tunnel face, the shielding electrode is arranged facing the lateral direction of a tunnel, the shield tunneling machine further comprises a return electrode which is connected with the ground outside the tunnel, the main electrode, the shielding electrode and the return electrode are all electrically connected with an acquisition communication system in the shield tunneling machine through leads, and the acquisition communication system is communicated with an upper computer through a network cable.
2. The on-board electrical prospecting apparatus of claim 1, characterized in that: and welding a welding spot as a main electrode connecting point on or near a cutter head of the shield tunneling machine.
3. The on-board electrical prospecting apparatus of claim 1, characterized in that: and welding a welding spot on a shield body of the shield machine to serve as a shielding electrode connecting point.
4. The on-board electrical prospecting apparatus of claim 1, characterized in that: and a ground anchor is externally used in the tunnel to be in contact with the ground to serve as a return electrode connection point.
5. The on-board electrical prospecting apparatus of claim 1, characterized in that: the acquisition communication system comprises a preamplification unit, a band-pass filtering unit, an AD conversion unit, a digital signal processing unit, a result preprocessing unit and a correction processing unit which are sequentially and electrically connected together, a main electrode, a shielding electrode and a return electrode are electrically connected with corresponding joints of the preamplification unit through leads, and the correction processing unit is communicated with an upper computer through a network cable.
6. The on-board electrical prospecting apparatus of claim 1, characterized in that: the upper computer is a notebook computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122307729.1U CN215728870U (en) | 2021-09-23 | 2021-09-23 | Carrying type electric method advanced geological forecasting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122307729.1U CN215728870U (en) | 2021-09-23 | 2021-09-23 | Carrying type electric method advanced geological forecasting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215728870U true CN215728870U (en) | 2022-02-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN202122307729.1U Active CN215728870U (en) | 2021-09-23 | 2021-09-23 | Carrying type electric method advanced geological forecasting device |
Country Status (1)
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| CN (1) | CN215728870U (en) |
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2021
- 2021-09-23 CN CN202122307729.1U patent/CN215728870U/en active Active
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