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

Abstract

Disclosed is a rope coring drill-based engineering geology drilling construction method. The method utilises a single-action dual-tube drill, a coring drill bit (15) is mounted on a lower end of an outer tube (14), a core tube (22) is mounted on a lower end of an elastic clamp (25), the elastic clamp (25) is suspended within an outer tube assembly (1), an upper end of the outer tube assembly (1) is connected to a power head of a drill machine via a drill rod, and the power head of the drill machine drives the drill rod to drive the coring drill bit (15) on the outer tube assembly (1) to rotate to cut rock and earth. After the drilling depth reaches the length of the core tube (22), a cylinder lifts up the whole drill a distance from the bottom of the hole so as to draw out a core, the drill rod is gripped and fixed via a holder of the drill machine, a rope coring extractor is dropped down, an inner tube assembly (2) filled with the core is extracted, and another inner tube assembly is placed into the outer tube assembly (1) for a next round of drilling. After the drilling reaches an expected drilling depth, the inner tube assembly (2) filled with the core is extracted, the drill rod and the outer tube assembly (1) remain motionless within the drill hole, and a standard penetrator (5) is connected via a test rod (3) and passes through the drill rod and the outer tube assembly (1) to the bottom of the drill hole. A top end of the test rod (3) is connected to a standard penetration hammer base (4), and a standard penetration hammer above the test rod (3) is used to strike the standard penetration hammer base (4), so as to perform a standard penetration test. After the standard penetration test is complete, a main hoisting machine is used to rapidly extract the standard penetrator.

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...

AI Technical Summary

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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