A frozen sampling device for urban loose strata

Abstract

The application discloses a freezing sampling device for urban loose strata, which relates to the field of geological exploration sampling equipment. , the freezing mechanism is used to freeze the end of the core tube close to the drill bit; the end of the outer tube away from the drill bit is provided with a flushing fluid inlet channel, and a water flow channel connecting the flushing fluid inlet channel is formed between the outer tube and the core tube, and the drill bit is provided with The drainage channel that communicates with the water channel. The present application has the following advantages and effects: by adding a freezing mechanism, the core in the core tube is frozen, and the loose core is sealed in the core tube, so as to prevent the core from falling off during the process of drilling and core extraction, and improve the core extraction rate of the loose bottom layer.

Description

technical field [0001] The present application relates to the field of geological exploration sampling equipment, in particular to a frozen sampling device for urban loose strata. Background technique [0002] Modern industrial and civil large-scale high-rise buildings are mostly based on the Quaternary sand and pebble covering layer, and some hydropower engineering buildings are also built on the sand and pebble covering layer. Identifying the structure, stratification, physical and mechanical properties, permeability, etc. of such strata, especially the distribution and properties of sand layers, is the basis for ensuring the quality and safety of buildings. Original composition and particle gradation. [0003] However, the sand and 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, vibration and abrasion by the flushing fluid, so the cores are prone to occur in th...

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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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