Sampling device and sampling method for measuring initial visbreaking moisture content of cutter head interface

Abstract

The invention provides a sampling device and a sampling method for measuring initial visbreaking moisture content of a cutter head interface. The device comprises a soil box, a groove box, a cutter, a rotary cutting cutter head, a rotating shaft, a roller, a metal plate, a wire A, a wire B, a weight and a pressing rod, a groove A, a groove B, a hole channel, a pressing rod and a hole are formed in the inner side of one side of the soil box; a groove box is allowed to be arranged in the groove A; the hole channel allows the pressing rod to pass through, and the cutter can downwards cut soil; the rotary cutter head is connected with a roller on the outer side of the soil box through a rotating shaft, and a heavy object is suspended on a groove of the roller through a line; the rotary cutter head is connected to the cathode of the direct-current power supply; the metal plate is connected to the anode of the direct-current power supply; the cutter can integrally cut off extremely thin soil on the surface of the rotary cutter head, so that external soil is prevented from being mixed into the soil to influence the accuracy of measuring the water content of soil near an interface; and the distribution characteristics of the initial visbreaking moisture content of the surface of the whole cutterhead and the distribution characteristics of the initial visbreaking moisture content of the cutterhead under different visbreaking degrees can be determined.

Description

technical field [0001] The invention relates to anti-sticking and viscosity-reducing design technology on the surface of metal parts, in particular to a sampling device and sampling method for accurately measuring the interface moisture content after electroosmosis and viscosity-reducing of the interface between a metal cutter head and a soil body. Background technique [0002] It is a common phenomenon that the contact between the metal part and the soil with a certain moisture content will cause adhesion. In the shield construction operation, this adhesion phenomenon will bring extremely unfavorable consequences, such as the soil on the surface of the metal cutter head. The formation of a high-strength mud cake causes the cutter head and cutter to be wrapped, which cannot effectively cut the soil layer, resulting in a decrease in the efficiency of shield tunneling; The construction period, resulting in extremely unfavorable safety hazards, greatly increased the constructio...

AI Technical Summary

Problems solved by technology

Existing test methods often focus on directly pulling out the test plate to measure the adhesion force between the soil and the metal interface. The soil after pulling out has been disturbed and damaged, especially the thin layer of soil near the interface. Unable to maintain a specific shape, very uneven, unable to achieve effective extraction of thin layers of soil on the metal cutterhead surface and accurate measurement of moisture content

[0005] Therefore, the existing technology cannot guarantee the measurement of cutterhead adhesion while protecting the thin layer of soil near the interface from being disturbed and damaged, which restricts the accurate measurement of the initial viscosity-reducing moisture content of the cutterhead interface, let alone partitioning the cutterhead surface. Sampling and measuring the moisture content of the soil at different locations, so as to determine the distribution characteristics of the initial viscosity-reducing moisture content on the entire cutterhead surface; it is also impossible to determine the distribution characteristics of the initial viscosity-reducing moisture content under different degrees of visbreaking

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