Freezing sampling device for urban unconsolidated formation

Abstract

The invention discloses a freezing sampling device for an urban unconsolidated formation, and relates to the field of geological prospecting sampling equipment. The freezing sampling device comprisesan outer pipe. A drill bit is arranged at one end of the outer pipe, a core barrel communicated with the drill bit is arranged in the outer pipe, and a freezing mechanism is arranged in the outer pipeand used for freezing the end, close to the drill bit, of the core barrel. A flushing fluid inlet channel is formed in the end, deviating from the drill bit, of the outer pipe, a water flow channel communicated with the flushing fluid inlet channel is formed between the outer pipe and the core barrel, and a drainage channel communicated with the water flow channel is formed in the drill bit. Thefreezing sampling device for the urban unconsolidated formation has the following advantages and effects that the freezing mechanism is additionally arranged to freeze the core in the core barrel, theloose core is sealed in the core barrel, the core is prevented from falling off in the coring process, and the coring rate of a loose bottom layer is increased.

Description

technical field [0001] The application relates to the field of geological exploration sampling equipment, in particular to a frozen sampling device for urban loose formations. Background technique [0002] Modern industrial and civil large-scale high-rise buildings are mostly based on the Quaternary sand and pebble overlay, and some hydropower engineering buildings are also built on the sand and pebble overlay. Ascertaining the structure, layering, physical and mechanical properties, permeability, etc. of this type of stratum, especially the distribution and properties of the sand layer, is the basis for ensuring the quality and safety of buildings, so when sampling, try to keep the original layer, Raw composition and particle gradation. [0003] However, sand pebble gravel formations are generally poorly cemented, loose, and broken, and during the sampling process of the drill bit, the cores obtained are afraid of erosion by flushing fluid, vibration, and abrasion, so core...

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Problems solved by technology

[0003] However, sand pebble gravel formations are generally poorly cemented, loose, and broken, and during the sampling process of the drill bit, the cores obtained are afraid of erosion by flushing fluid, vibration, and abrasion, so cores are prone to occur during core extraction. The problem of falling, resulting in a low coring rate in this type of formation, needs to be improved

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