A drilling resistivity advanced detection device and detection method for TBM

Abstract

The invention relates to a drilling resistivity advanced detection device used for a TBM and a detection method thereof. The detection device comprises an external bushing, an internal transmission rod, electrodes, a rotating bearing and a position limiting device. The internal circle of the rotating bearing sleeves the internal transmission rod. The electrodes are arranged in the electrode accommodating parts in the external bushing, and the head parts face the external side of the side wall of the external bushing. The rear parts of the electrodes are connected with one end of electrode compression leads. The other end of the electrode compression leads is connected with the external circle of the rotating bearing. The rear ends of the electrodes are provided with springs. The position limiting device comprises an external bushing blocking part and an internal transmission rod protruding part which are matched with each other. When the protruding part and the blocking part have an overlapped part, the external bushing stops axial relative movement of the internal transmission rod. When the positions of protruding part and the blocking part are staggered, the internal transmission rod and the external bushing are in the axial free movement state.

Description

technical field [0001] The invention relates to a borehole resistivity advance detection device and a detection method thereof, in particular to a borehole resistivity advance detection device and a detection method for TBM. Background technique [0002] my country is already the country with the largest scale and difficulty in tunnel construction in the world, and more deep and long tunnels will be built in railway and highway traffic projects, water conservancy and hydropower projects. TBM (full-face tunnel boring machine) construction has many advantages of safety, efficiency and economy, and more and more tunnel construction in my country will adopt TBM construction. When tunnels pass through unfavorable geological sections, especially sections with developed disaster-causing structures such as faults and karst caves, collapses and water and mud inrush disasters are extremely prone to occur, posing a huge threat to the safety of construction personnel and equipment, and ...

AI Technical Summary

Problems solved by technology

[0006] 1. The electrodes of the general detection device are exposed outside. When the detection device enters and exits the borehole, the electrode rubs against the wall of the borehole, which is easy to be damaged, and the service life of the detection device is short;

[0007] 2. For boreholes with elevation angles, ordinary water seals and other methods cannot be used for electrode coupling. The electrode and the rock wall of the borehole lack an electrolyte environment, resulting in poor coupling between the electrode and the rock wall, and the accuracy of the detection results cannot be guaranteed. ;

[0008] 3. The depth of the detection device entering the borehole needs to be manually recorded, which cannot be adapted to the mechanization and automation of TBM construction, increasing construction time and construction costs

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