A construction method for engineering geological drilling based on wireline core drilling tools

Abstract

The invention discloses an engineering geological drilling construction method based on a rope core drilling tool. It adopts a single-action double-tube drilling tool to press-in drilling during rotation. The full-hole and tube drilling speed is very fast, the mud consumption is small, and the rock The core tube remains in a non-rotating state, causing little disturbance to the soil. When the drilling depth reaches the length of the core tube, the oil cylinder lifts the entire drilling tool a certain distance from the bottom of the hole to pull out the core. The core quality is high and can be Extract undisturbed soil samples; during coring and standard penetration tests, the drill pipe and outer pipe assembly always remain motionless in the borehole, protecting the hole wall and avoiding damage to the hole wall by repeatedly lifting the drill. At the same time, it also reduces the risk of the test rod and the The friction of the hole wall reduces uncertain factors and makes the test results more accurate.

Description

technical field [0001] The invention relates to the technical field of engineering geological drilling, in particular to an engineering geological drilling construction method based on a rope core drilling tool. Background technique [0002] Engineering geological drilling is to use drilling tools to drill into the formation according to certain purposes and requirements, and take out cores and soil samples to find out the geological conditions and foundation bearing capacity. This requires drilling into the topsoil layer and has special sampling requirements, and also requires It is one of the purposes of engineering drilling to carry out special testing work in boreholes and take undisturbed soil samples. This is to measure the physical and mechanical properties of the natural structure of the soil, such as capacity, density, temperature, shear strength, and compressibility coefficient. Describe the characteristics of rock and soil and determine the bearing capacity and st...

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Problems solved by technology

[0003] At present, the most widely used engineering geological drilling is to use a vertical shaft drilling rig (such as XY-1 or XY-2 type) and a single-tube drilling tool to drill with a cemented carbide drill bit mechanically, without sending water and dry drilling, and the footage is 0.5~ 2 meters, lift a big drill, take the core and carry out the standard penetration test, you need to lift the whole set of drill pipe and drilling tools out of the hole. The biggest advantage of this method is low cost and simple operation, but The limitations and shortcomings are also very obvious. Due to the single-pipe drilling, the disturbance to the soil layer is large, and it is difficult to extract undisturbed soil samples in complex strata, resulting in poor core quality; Or put down the entire drill pipe and drilling tools, it is easy to damage the hole wall, and often occurs such as block dropping and hole collapse, resulting in drill sticking accidents; in addition, during the standard penetration test, the drill pipe is elastically deformed by the hammer and easily hits the hole wall, which affects the stability of the hole wall, and the friction between the drill pipe and the hole wall affects the test accuracy

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