Double-tubes single-action valve type coring earth borrowing device

A technology of double-pipe single-action valve and soil fetcher, which is applied in the fields of earth square drilling, extraction of undisturbed core devices, on-site foundation soil survey, etc. It can solve the problems of complex soil extraction process, high price of soil fetcher, soft cohesive soil and sandy soil. Easy to fall off and other problems

Inactive Publication Date: 2012-05-09
CCCC THIRD HARBOR CONSULTANTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the rotary press-in soil extractors used in China are imitations of Denison type or Pitcher type soil extractors. , the soil extraction process is relatively complicated, and the soft cohesive soil and sandy

Method used

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  • Double-tubes single-action valve type coring earth borrowing device
  • Double-tubes single-action valve type coring earth borrowing device
  • Double-tubes single-action valve type coring earth borrowing device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] When the double-pipe single-action valve type coring device was lowered into the hole, the spring flap 42 of the spring valve device 4 was turned down, and the valve shoe 43 fell out of the valve seat 41 and the valve was closed. The mud in the hole enters the gap between the inner and outer pipes and the inner pipe, and the mud entering the inner pipe passes through the connecting shaft passage A, pushes the ball valve 10, and flows back into the hole from the discharge hole 11 (Fig. 4-a); When the core soil fetcher reaches the bottom of the hole, due to the dead weight of the drilling tool and the cutting edge of the flexible pipe shoe 43 is pressed into the soil layer at the bottom of the hole, the upper part of the flexible pipe shoe 43 pushes away the spring flap and enters the valve seat 41, and the steel in the ball valve 10 The ball falls back to the valve seat (Fig. 4-b); when drilling into soil, the outer pipe rotates with the drill pipe, and the alloy drill bi...

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Abstract

A double-tube single-acting valve type core and soil sampling device is a tool for sampling the full section soil core and undisturbed soil sample of the foundation soil in a building field. The core and soil sampling device is applicable for cohesive soil, silty soil and powder fine sand, the core sampling and the soil sampling can be accomplished at the same time in a drilling process, the device can prevent the core and the soil sample from dropping off and accurately control the drilling depth, the rock core sampling rate can meet the requirements stated by criterion (the core sampling ratio of the cohesive soil being not less than 80%, and that of the sand soil being not less than 65%), and the soil sampling quality is superior to that of the normal (thick wall) soil sampler, the drilling efficiency is obviously higher than that of the normal core and soil sampling device.

Description

technical field [0001] The invention relates to a double-pipe single-action valve type coring soil extractor, which is a tool and a process method used for geotechnical engineering investigation to collect full-section soil cores and undisturbed soil samples of foundation soil in construction sites. Background technique [0002] At present, undisturbed soil samples are used in geotechnical engineering surveys in my country, and two drilling sampling techniques, coreless interval sampling and full-section core interval sampling, are generally used. The performance of the two drilling sampling processes is detailed in Table 1. [0003] Table 1 of the performance of commonly used coring sampling exploration technology [0004] [0005] With the development of the country's economic construction, engineering construction projects, especially major national engineering projects, have higher and higher quality requirements for geotechnical engineering investigations. For the Q...

Claims

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Application Information

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IPC IPC(8): E21B49/02E21B25/00E02D1/04
Inventor 乌孟庄张成董教社郑建朝
Owner CCCC THIRD HARBOR CONSULTANTS
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