CA3004688C - An engineering geological drilling construction method based on wire line coring drilling tool - Google Patents
An engineering geological drilling construction method based on wire line coring drilling tool Download PDFInfo
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- CA3004688C CA3004688C CA3004688A CA3004688A CA3004688C CA 3004688 C CA3004688 C CA 3004688C CA 3004688 A CA3004688 A CA 3004688A CA 3004688 A CA3004688 A CA 3004688A CA 3004688 C CA3004688 C CA 3004688C
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- 238000005553 drilling Methods 0.000 title claims abstract description 163
- 238000010276 construction Methods 0.000 title claims abstract description 18
- 238000012360 testing method Methods 0.000 claims abstract description 38
- 230000035515 penetration Effects 0.000 claims abstract description 28
- 239000011435 rock Substances 0.000 claims abstract description 25
- 239000002689 soil Substances 0.000 claims description 18
- 241000251468 Actinopterygii Species 0.000 claims description 6
- 238000000034 method Methods 0.000 description 7
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 229910003460 diamond Inorganic materials 0.000 description 2
- 239000010432 diamond Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D1/00—Investigation of foundation soil in situ
- E02D1/02—Investigation of foundation soil in situ before construction work
- E02D1/022—Investigation of foundation soil in situ before construction work by investigating mechanical properties of the soil
- E02D1/025—Investigation of foundation soil in situ before construction work by investigating mechanical properties of the soil combined with sampling
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors
- E21B25/02—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors the core receiver being insertable into, or removable from, the borehole without withdrawing the drilling pipe
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Civil Engineering (AREA)
- Soil Sciences (AREA)
- Paleontology (AREA)
- Analytical Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses an engineering geological drilling construction method based on a wire line coring drilling tool. A single-action double-barrel drilling tool is adopted, a coring bit is installed at a lower end of an outer barrel, a core barrel is installed at a lower end of a spring clamp, the spring clamp is suspended inside an outer barrel assembly, and an upper end of the outer barrel assembly is connected with a power head; after a drilling depth reaches the length of the core barrel, the whole drilling tool is lifted to pull off rock cores; an inner barrel assembly is fished out to replace for another set; after the drilling reaches an expected drilling depth, the inner barrel assembly is fished out, while the drilling rod and the outer barrel assembly remain still in a drilling hole; a standard penetration test is carried out.
Description
An Engineering Geological Drilling Construction Method Based on Wire Line Coring Drilling Tool Technical field The invention relates to the technical field of engineering geological drilling, and particularly relates to an engineering geological drilling construction method based on a wire line coring drilling tool.
Background Art Engineering geological drilling, according to certain objectives and requirements, utilizes drilling machines and tools to drill into stratums, to take out rock cores and soil samples to ascertain geological conditions and foundation bearing capability.
This requires to drill into topsoil and has special sampling requirements, and also requires doing special testing operation in the drilling hole. One of the objectives of engineering drilling is to extract undisturbed soil sample to measure the soil physico-mechanical properties such as natural structure capacity, density, temperature, shearing strength, compressibility coefficient, etc., to conduct rock-soil characteristics description and determine the soil layer bearing capacity and stability, and to provide reliable design basis for various engineering constructions.
At present, the most widely applied engineering geological drilling is utilizing a spindle-type drilling rig, for example, XY-1 type or XY-2 type, and a single barrel drilling tool, and using hard alloy drilling bit mechanical rotation method to drill, dry drilling with no water supplied, the big drill lifted once for every drill footage of 0.5 m to 2 m. When taking rock core and conducting standard penetration test, the whole set of drilling rod and drilling tool has to be lifted out from the hole. The biggest advantages of this method are that the cost is low and the operation is simple. But the limitations and disadvantages of the drilling rig and drilling tool are also very obvious.
Because single barrel drilling is adopted, the disturbance to soil layer is large, and it's hard to extract undisturbed soil sample in complex stratums, which lead to the poor rock core quality; during coring and standard penetration test, the whole drilling rod and drilling tool also have to be lifted or put down repeatedly, which would damage the hole wall easily, and phenomena such as chip off-falling, hole collapse and the like often occur, which lead to drill jamming accidents. In addition, during standard penetration test, the drilling rod would hit the hole wall easily because of its elastic deformation caused by the hammering, which affects the stability of the hole wall, and meanwhile the friction between the drilling rod and the hole wall affects the test accuracy.
Technical problem In order to overcome the disadvantages in the prior art mentioned above, this invention provides an engineering geological drilling construction method based on a wire line coring drilling tool, which adopts a single-action double-barrel drilling tool for full-hole barrel-following drilling, and during coring and standard penetration tests, the drilling rod and the outer barrel assembly remain still all the time in the drilling
Background Art Engineering geological drilling, according to certain objectives and requirements, utilizes drilling machines and tools to drill into stratums, to take out rock cores and soil samples to ascertain geological conditions and foundation bearing capability.
This requires to drill into topsoil and has special sampling requirements, and also requires doing special testing operation in the drilling hole. One of the objectives of engineering drilling is to extract undisturbed soil sample to measure the soil physico-mechanical properties such as natural structure capacity, density, temperature, shearing strength, compressibility coefficient, etc., to conduct rock-soil characteristics description and determine the soil layer bearing capacity and stability, and to provide reliable design basis for various engineering constructions.
At present, the most widely applied engineering geological drilling is utilizing a spindle-type drilling rig, for example, XY-1 type or XY-2 type, and a single barrel drilling tool, and using hard alloy drilling bit mechanical rotation method to drill, dry drilling with no water supplied, the big drill lifted once for every drill footage of 0.5 m to 2 m. When taking rock core and conducting standard penetration test, the whole set of drilling rod and drilling tool has to be lifted out from the hole. The biggest advantages of this method are that the cost is low and the operation is simple. But the limitations and disadvantages of the drilling rig and drilling tool are also very obvious.
Because single barrel drilling is adopted, the disturbance to soil layer is large, and it's hard to extract undisturbed soil sample in complex stratums, which lead to the poor rock core quality; during coring and standard penetration test, the whole drilling rod and drilling tool also have to be lifted or put down repeatedly, which would damage the hole wall easily, and phenomena such as chip off-falling, hole collapse and the like often occur, which lead to drill jamming accidents. In addition, during standard penetration test, the drilling rod would hit the hole wall easily because of its elastic deformation caused by the hammering, which affects the stability of the hole wall, and meanwhile the friction between the drilling rod and the hole wall affects the test accuracy.
Technical problem In order to overcome the disadvantages in the prior art mentioned above, this invention provides an engineering geological drilling construction method based on a wire line coring drilling tool, which adopts a single-action double-barrel drilling tool for full-hole barrel-following drilling, and during coring and standard penetration tests, the drilling rod and the outer barrel assembly remain still all the time in the drilling
- 2 -hole, so that the disturbance to the soil layer is small, and the hole wall is protected from damage.
Technical solution To solve the technical problem, the invention provides an engineering geological drilling construction method based on a wire line coring drilling tool, and the method comprises the following steps:
step 1, selecting a drilling tool, wherein a single-action double-barrel wire line coring drilling tool is adopted as the drilling tool, the drilling tool comprises an outer barrel assembly and an inner barrel assembly, the outer barrel assembly comprises an outer barrel and a coring bit installed at the lower end of the outer barrel, the inner barrel assembly comprises a core barrel and a spring clamp which is clampable inside the outer barrel assembly;
step 2, installing the coring bit at the lower end of the outer barrel, and installing the core barrel at the lower end of the spring clamp, wherein the spring clamp is suspended inside the outer barrel assembly, and the upper end of the outer barrel assembly is connected with the power head of a drilling rig through a drilling rod;
step 3, driving, by the power head of the drilling rig, the drilling rod to drive the coring bit on the outer barrel assembly to rotate for cutting rock and soil, wherein as an oil cylinder feeds under increased pressure, the core barrel keeps a non-rotation state and sleeves rock cores which enter the core barrel continually;
Technical solution To solve the technical problem, the invention provides an engineering geological drilling construction method based on a wire line coring drilling tool, and the method comprises the following steps:
step 1, selecting a drilling tool, wherein a single-action double-barrel wire line coring drilling tool is adopted as the drilling tool, the drilling tool comprises an outer barrel assembly and an inner barrel assembly, the outer barrel assembly comprises an outer barrel and a coring bit installed at the lower end of the outer barrel, the inner barrel assembly comprises a core barrel and a spring clamp which is clampable inside the outer barrel assembly;
step 2, installing the coring bit at the lower end of the outer barrel, and installing the core barrel at the lower end of the spring clamp, wherein the spring clamp is suspended inside the outer barrel assembly, and the upper end of the outer barrel assembly is connected with the power head of a drilling rig through a drilling rod;
step 3, driving, by the power head of the drilling rig, the drilling rod to drive the coring bit on the outer barrel assembly to rotate for cutting rock and soil, wherein as an oil cylinder feeds under increased pressure, the core barrel keeps a non-rotation state and sleeves rock cores which enter the core barrel continually;
- 3 -step 4, lifting, by the oil cylinder, after the drilling depth reaches the length of the core barrel, the whole drilling tool from the hole bottom for a short distance to pull off the rock cores, and clamping and fixing the drilling rod by a gripper of the drilling rig;
step 5, putting down a wire line coring fisher to fish out the inner barrel assembly filled with rock cores, while keeping the drilling rod and the outer barrel assembly still, and using another set of inner barrel assembly for replacement to be put into the outer barrel assembly again for the next round of drilling;
step 6, repeating the steps from step 3 to step 5 until the drilling reaches the expected drilling depth, lifting, by the oil cylinder, the whole drilling tool from the hole bottom for a short distance to pull off the rock cores, putting down the wire line coring fisher to fish out the inner barrel assembly filled with rock cores, while keeping the drilling rod and the outer barrel assembly still in the drilling hole;
step 7, connecting a standard penetrometer by a test bar and passing through the drilling rod and the outer barrel assembly to be sent to a bottom of the drilling hole;
step 8, connecting a top end of the test bar with a standard penetration hammer base, and carrying out a standard penetration test by utilizing the standard penetration hammer above the test bar to hit the standard penetration hammer base in a manner of free falling, wherein during the test, the drilling rod and the outer barrel assembly remain still in the drilling hole;
step 9, utilizing a main winch to lift out the standard penetrometer quickly after the standard penetration test is finished.
step 5, putting down a wire line coring fisher to fish out the inner barrel assembly filled with rock cores, while keeping the drilling rod and the outer barrel assembly still, and using another set of inner barrel assembly for replacement to be put into the outer barrel assembly again for the next round of drilling;
step 6, repeating the steps from step 3 to step 5 until the drilling reaches the expected drilling depth, lifting, by the oil cylinder, the whole drilling tool from the hole bottom for a short distance to pull off the rock cores, putting down the wire line coring fisher to fish out the inner barrel assembly filled with rock cores, while keeping the drilling rod and the outer barrel assembly still in the drilling hole;
step 7, connecting a standard penetrometer by a test bar and passing through the drilling rod and the outer barrel assembly to be sent to a bottom of the drilling hole;
step 8, connecting a top end of the test bar with a standard penetration hammer base, and carrying out a standard penetration test by utilizing the standard penetration hammer above the test bar to hit the standard penetration hammer base in a manner of free falling, wherein during the test, the drilling rod and the outer barrel assembly remain still in the drilling hole;
step 9, utilizing a main winch to lift out the standard penetrometer quickly after the standard penetration test is finished.
- 4 -As an improvement for the above technical solution, in step 4 and step 6, the whole drilling tool is lifted by the oil cylinder by 100 mm from the hole bottom to pull off the rock cores.
As an improvement for the above technical solution, the minimum inner diameter of the outer barrel assembly is no less than 56 mm, and the maximum outer diameter of the standard penetrometer is no greater than 50 mm.
As an improvement for the above technical solution, the outer diameter of the coring bit is 75.7 mm, and the inner diameter of the coring bit is 56 mm.
As an improvement for the above technical solution, in step 2, the length of the inner barrel assembly is adjusted and checked to guarantee that the inner barrel assembly and the step part of the inner wall of the drilling bit are not in contact with each other, and the water-passing gap is no greater than 1 mm.
Advantageous effects In the drilling construction method, the single-action double-barrel drilling tool is adopted for full-hole barrel-following drilling, it drills as it is pressed in during rotating, the drilling speed is very fast, the mud consume is less, the core barrel keeps a non-rotation state, the disturbance to soil layer is small, the coring quality is high, and undisturbed soil sample can be extracted. During coring and standard penetration test, the drilling rod and the outer barrel assembly remain still in the drilling hole all the time, the hole wall is protected, the damage of the hole wall from repeatedly lifting the
As an improvement for the above technical solution, the minimum inner diameter of the outer barrel assembly is no less than 56 mm, and the maximum outer diameter of the standard penetrometer is no greater than 50 mm.
As an improvement for the above technical solution, the outer diameter of the coring bit is 75.7 mm, and the inner diameter of the coring bit is 56 mm.
As an improvement for the above technical solution, in step 2, the length of the inner barrel assembly is adjusted and checked to guarantee that the inner barrel assembly and the step part of the inner wall of the drilling bit are not in contact with each other, and the water-passing gap is no greater than 1 mm.
Advantageous effects In the drilling construction method, the single-action double-barrel drilling tool is adopted for full-hole barrel-following drilling, it drills as it is pressed in during rotating, the drilling speed is very fast, the mud consume is less, the core barrel keeps a non-rotation state, the disturbance to soil layer is small, the coring quality is high, and undisturbed soil sample can be extracted. During coring and standard penetration test, the drilling rod and the outer barrel assembly remain still in the drilling hole all the time, the hole wall is protected, the damage of the hole wall from repeatedly lifting the
- 5 -drill is avoided. Meanwhile the friction between the test bar and the hole wall is reduced, and uncertain factors are reduced, which make the test results more accurate.
Brief Description of the Drawings The invention is described further in combination with the accompanying drawings and specific embodiments as follows, wherein:
Figure 1 is a structural schematic view of an embodiment of the invention when drilling and coring;
Figure 2 is a structural schematic view of an embodiment of the invention during a standard penetration test.
Detailed description of the invention As shown in Figure 1, an adopted drilling tool in a drilling method of this invention is a single-action double-barrel wire line coring drilling tool, comprising an outer barrel assembly 1 and an inner barrel assembly 2 which is inserted in the outer barrel assembly 1. The outer barrel assembly 1 comprises a spring clamp stopper 11, a spring clamp chamber 12, a socket ring 13, an outer barrel 14, a reamer 16 and a coring bit 15, which are connected from up to down successively. The minimum inner diameter of the outer barrel assembly 1 is no less than 56 mm. The coring bit 15 is made of hard alloy, or polycrystalline diamond compact drilling bit or impregnated diamond drilling bit can also be adopted, with the outer diameter of 75.7 mm and the inner diameter of 56 mm. The inner barrel assembly 2 comprises a drilling tool head assembly 21, a core barrel 22, a snap spring base 23 and a snap spring 24, which are
Brief Description of the Drawings The invention is described further in combination with the accompanying drawings and specific embodiments as follows, wherein:
Figure 1 is a structural schematic view of an embodiment of the invention when drilling and coring;
Figure 2 is a structural schematic view of an embodiment of the invention during a standard penetration test.
Detailed description of the invention As shown in Figure 1, an adopted drilling tool in a drilling method of this invention is a single-action double-barrel wire line coring drilling tool, comprising an outer barrel assembly 1 and an inner barrel assembly 2 which is inserted in the outer barrel assembly 1. The outer barrel assembly 1 comprises a spring clamp stopper 11, a spring clamp chamber 12, a socket ring 13, an outer barrel 14, a reamer 16 and a coring bit 15, which are connected from up to down successively. The minimum inner diameter of the outer barrel assembly 1 is no less than 56 mm. The coring bit 15 is made of hard alloy, or polycrystalline diamond compact drilling bit or impregnated diamond drilling bit can also be adopted, with the outer diameter of 75.7 mm and the inner diameter of 56 mm. The inner barrel assembly 2 comprises a drilling tool head assembly 21, a core barrel 22, a snap spring base 23 and a snap spring 24, which are
- 6 -connected from up to down successively. The socket ring 13 can limit and support the drilling tool head assembly 21, and a spring clamp 25, which is matchable with the spring clamp stopper 11 for fastening, is arranged on the drilling tool head assembly 21.
As shown in figure 2, a test bar 3 is arranged through the outer barrel assembly 1, a standard penetration hammer base 4 is connected at the top end of the test bar 3, a standard penetrometer 5 is connected at the lowered end, and the standard penetrometer 5 has a maximum outer diameter no greater than 50 mm in order to be inserted into the outer barrel assembly 1.
The engineering geological drilling construction method based on a wire line coring drilling tool of this invention, comprising the following steps:
step 1, selecting a drilling tool, wherein a single-action double-barrel wire line coring drilling tool is adopted as the selected drilling tool.
step 2, installing the coring bit 15 at the lower end of the outer barrel 14, and installing the core barrel 22 at the lower end of the spring clamp 25, wherein the spring clamp 25 is suspended inside the spring clamp chamber 12. Adjusting and checking the length of the inner barrel assembly 2 to guarantee that the snap spring base 23 and the step part of the inner wall of the drilling bit are not in contact with each other, and the water-passing gap is no greater than 1 mm. The upper end of the spring clamp stopper .. 11 is connected with the power head of a drilling rig through a drilling rod.
As shown in figure 2, a test bar 3 is arranged through the outer barrel assembly 1, a standard penetration hammer base 4 is connected at the top end of the test bar 3, a standard penetrometer 5 is connected at the lowered end, and the standard penetrometer 5 has a maximum outer diameter no greater than 50 mm in order to be inserted into the outer barrel assembly 1.
The engineering geological drilling construction method based on a wire line coring drilling tool of this invention, comprising the following steps:
step 1, selecting a drilling tool, wherein a single-action double-barrel wire line coring drilling tool is adopted as the selected drilling tool.
step 2, installing the coring bit 15 at the lower end of the outer barrel 14, and installing the core barrel 22 at the lower end of the spring clamp 25, wherein the spring clamp 25 is suspended inside the spring clamp chamber 12. Adjusting and checking the length of the inner barrel assembly 2 to guarantee that the snap spring base 23 and the step part of the inner wall of the drilling bit are not in contact with each other, and the water-passing gap is no greater than 1 mm. The upper end of the spring clamp stopper .. 11 is connected with the power head of a drilling rig through a drilling rod.
- 7 -step 3, driving, by the power head of the drilling rig, the drilling rod to drive the coring bit 15 on the outer barrel assembly 1 to rotate for cutting rock and soil, as the oil cylinder feeds under increased pressure, the core barrel 22 keeps a non-rotation state and sleeves rock cores which enter the core barrel 22 continually.
step 4, after the drilling depth reaches the length of the core barrel 22, lifting, by an oil cylinder, the whole drilling tool for 100 mm from the hole bottom to pull off the rock cores, and clamping and fixing the drilling rod by a gripper of the drilling rig.
step 5, putting down a wire line coring fisher to fish out the inner barrel assembly 2 filled with rock cores, while the drilling rod and the outer barrel assembly 1 remain still, and changing for another set of inner barrel assembly 2 to be put into the outer barrel assembly 1 again for the next round of drilling.
step 6, repeating the steps from step 3 to step 5 until the drilling reaches the expected drilling depth, lifting, by the oil cylinder, the whole drilling tool for 100 mm from the hole bottom to pull off the rock cores, and putting down a wire line coring fisher to fish out the inner barrel assembly 2 filled with rock cores, while the drilling rod and the outer barrel assembly 1 remain still in the drilling hole.
step 7, connecting a standard penetrometer 5 by a test bar 3 and passing through the drilling rod and the outer barrel assembly 1 to be sent to a bottom of the drilling hole.
step 8, connecting a standard penetration hammer base 4 to the top end of the test bar 3, carrying out a standard penetration test by utilizing the standard penetration
step 4, after the drilling depth reaches the length of the core barrel 22, lifting, by an oil cylinder, the whole drilling tool for 100 mm from the hole bottom to pull off the rock cores, and clamping and fixing the drilling rod by a gripper of the drilling rig.
step 5, putting down a wire line coring fisher to fish out the inner barrel assembly 2 filled with rock cores, while the drilling rod and the outer barrel assembly 1 remain still, and changing for another set of inner barrel assembly 2 to be put into the outer barrel assembly 1 again for the next round of drilling.
step 6, repeating the steps from step 3 to step 5 until the drilling reaches the expected drilling depth, lifting, by the oil cylinder, the whole drilling tool for 100 mm from the hole bottom to pull off the rock cores, and putting down a wire line coring fisher to fish out the inner barrel assembly 2 filled with rock cores, while the drilling rod and the outer barrel assembly 1 remain still in the drilling hole.
step 7, connecting a standard penetrometer 5 by a test bar 3 and passing through the drilling rod and the outer barrel assembly 1 to be sent to a bottom of the drilling hole.
step 8, connecting a standard penetration hammer base 4 to the top end of the test bar 3, carrying out a standard penetration test by utilizing the standard penetration
- 8 -hammer above the test bar 3 to hit the standard penetration hammer base 4 in a manner of free falling, and during the testing period, the drilling rod and the outer barrel assembly 1 remain still in the drilling hole.
step 9, utilizing a main winch to lift out the standard penetrometer 5 quickly after the standard penetration test is finished.
In step 2 of the method of this invention, the snap spring base 23 and the step part of the inner wall of the drilling bit 16 are not in contact with each other, which is convenient for supplying water during drilling, and the water-passing gap is no greater than 1 mm, which can avoid soil entering into the gap between the core barrel 22 and the outer barrel 14 during drilling process and prevent causing jamming of the core barrel 22.
The drilling tool is pressed in and drills during rotating, the full-hole barrel-following drilling speed is very fast, about 25 meters can be drilled within 8 hours in sandstone stratum and cobblestone stratum, and the mud consume is less.
Because the core barrel 22 keeps a non-rotation state, the disturbance to soil layer is small, the coring quality is high, and undisturbed soil sample can be extracted. During standard penetration test, the drilling rod and the outer barrel assembly 1 remain still in the drilling hole all the time, the hole wall is protected, the damage of the hole wall from lifting the drill repeatedly is avoided, and meanwhile the friction between the test bar 3 and the hole wall is reduced, it's avoided that the test bar 3 would hit the hole
step 9, utilizing a main winch to lift out the standard penetrometer 5 quickly after the standard penetration test is finished.
In step 2 of the method of this invention, the snap spring base 23 and the step part of the inner wall of the drilling bit 16 are not in contact with each other, which is convenient for supplying water during drilling, and the water-passing gap is no greater than 1 mm, which can avoid soil entering into the gap between the core barrel 22 and the outer barrel 14 during drilling process and prevent causing jamming of the core barrel 22.
The drilling tool is pressed in and drills during rotating, the full-hole barrel-following drilling speed is very fast, about 25 meters can be drilled within 8 hours in sandstone stratum and cobblestone stratum, and the mud consume is less.
Because the core barrel 22 keeps a non-rotation state, the disturbance to soil layer is small, the coring quality is high, and undisturbed soil sample can be extracted. During standard penetration test, the drilling rod and the outer barrel assembly 1 remain still in the drilling hole all the time, the hole wall is protected, the damage of the hole wall from lifting the drill repeatedly is avoided, and meanwhile the friction between the test bar 3 and the hole wall is reduced, it's avoided that the test bar 3 would hit the hole
- 9 -wall when deformed from bending, and uncertain factors are reduced which make the test results more accurate.
Industrial Applicability The engineering geological drilling method based on a wire line coring drilling tool of this invention, since a single-action double-barrel drilling tool is adopted, it is pressed in and drills during rotating, the full-hole barrel-following drilling speed is very fast, the mud consume is less, the core barrel keeps a non-rotation state, and the disturbance to soil layer is small. After the drilling depth reaches the length of the core barrel, the oil cylinder lifts the whole drilling tool for a distance from the hole bottom to pull off the rock cores, the coring quality is high, and undisturbed soil sample can be extracted.
And, according to the invention, during coring and standard penetration test, the drilling rod and the outer barrel assembly remain still all the time in the drilling hole, the hole wall is protected, the damage of the hole wall from lifting the drill repeatedly is avoided, and meanwhile the friction between the test bar and the hole wall is reduced, and uncertain factors are reduced, so that the test results are more accurate, which is more beneficial for carrying out the construction.
Industrial Applicability The engineering geological drilling method based on a wire line coring drilling tool of this invention, since a single-action double-barrel drilling tool is adopted, it is pressed in and drills during rotating, the full-hole barrel-following drilling speed is very fast, the mud consume is less, the core barrel keeps a non-rotation state, and the disturbance to soil layer is small. After the drilling depth reaches the length of the core barrel, the oil cylinder lifts the whole drilling tool for a distance from the hole bottom to pull off the rock cores, the coring quality is high, and undisturbed soil sample can be extracted.
And, according to the invention, during coring and standard penetration test, the drilling rod and the outer barrel assembly remain still all the time in the drilling hole, the hole wall is protected, the damage of the hole wall from lifting the drill repeatedly is avoided, and meanwhile the friction between the test bar and the hole wall is reduced, and uncertain factors are reduced, so that the test results are more accurate, which is more beneficial for carrying out the construction.
- 10 -
Claims (8)
1. An engineering geological drilling construction method based on a wire line coring drilling tool, comprising the following steps:
step 1, selecting a drilling tool, wherein a single-action double-barrel wire line coring drilling tool is adopted as the drilling tool, the drilling tool comprises an outer barrel assembly and an inner barrel assembly, the outer barrel assembly comprises an outer barrel and a coring bit installed at a lower end of the outer barrel, and the inner barrel assembly comprises a core barrel and a spring clamp which is clampable inside the outer barrel assembly;
step 2, installing the coring bit at the lower end of the outer barrel, and installing the core barrel at a lower end of the spring clamp, wherein the spring clamp is suspended inside the outer barrel assembly, and an upper end of the outer barrel assembly is connected with a power head of a drilling rig through a drilling rod;
step 3, driving, by the power head of the drilling rig, the drilling rod to drive the coring bit on the outer barrel assembly to rotate for cutting rock and soil, wherein as the coring bit is fed, the core barrel keeps a non-rotation state and sleeves rock cores which enter the core barrel continually;
step 4, after a drilling depth reaches the length of the core barrel, lifting, by an oil cylinder, the whole drilling tool from a hole bottom for a predetermined distance to pull off the rock cores, and clamping and fixing the drilling rod by a gripper of the drilling rig;
step 5, putting down a wire line coring fisher to fish out the inner barrel assembly filled with rock cores, while the drilling rod and the outer barrel assembly remain still, and changing for another set of inner barrel assembly to be put into the outer barrel assembly again for the next round of drilling;
step 6, repeating the steps from step 3 to step 5 until the drilling reaches the expected drilling depth, lifting, by the oil cylinder, the whole drilling tool from the hole bottom for a predetermined distance to pull off the rock cores, and putting down the wire line coring fisher to fish out the inner barrel assembly filled with rock cores, while the drilling rod and the outer barrel assembly remain still in a drilling hole;
step 7, connecting a standard penetrometer by a test bar and passing through the drilling rod and the outer barrel assembly to be sent to a bottom of the drilling hole;
step 8, connecting a top end of the test bar with a standard penetration hammer base, and carrying out a standard penetration test by utilizing a standard penetration hammer above the test bar to hit the standard penetration hammer base; and step 9, utilizing a main winch to lift out the standard penetrometer after the standard penetration test is finished.
step 1, selecting a drilling tool, wherein a single-action double-barrel wire line coring drilling tool is adopted as the drilling tool, the drilling tool comprises an outer barrel assembly and an inner barrel assembly, the outer barrel assembly comprises an outer barrel and a coring bit installed at a lower end of the outer barrel, and the inner barrel assembly comprises a core barrel and a spring clamp which is clampable inside the outer barrel assembly;
step 2, installing the coring bit at the lower end of the outer barrel, and installing the core barrel at a lower end of the spring clamp, wherein the spring clamp is suspended inside the outer barrel assembly, and an upper end of the outer barrel assembly is connected with a power head of a drilling rig through a drilling rod;
step 3, driving, by the power head of the drilling rig, the drilling rod to drive the coring bit on the outer barrel assembly to rotate for cutting rock and soil, wherein as the coring bit is fed, the core barrel keeps a non-rotation state and sleeves rock cores which enter the core barrel continually;
step 4, after a drilling depth reaches the length of the core barrel, lifting, by an oil cylinder, the whole drilling tool from a hole bottom for a predetermined distance to pull off the rock cores, and clamping and fixing the drilling rod by a gripper of the drilling rig;
step 5, putting down a wire line coring fisher to fish out the inner barrel assembly filled with rock cores, while the drilling rod and the outer barrel assembly remain still, and changing for another set of inner barrel assembly to be put into the outer barrel assembly again for the next round of drilling;
step 6, repeating the steps from step 3 to step 5 until the drilling reaches the expected drilling depth, lifting, by the oil cylinder, the whole drilling tool from the hole bottom for a predetermined distance to pull off the rock cores, and putting down the wire line coring fisher to fish out the inner barrel assembly filled with rock cores, while the drilling rod and the outer barrel assembly remain still in a drilling hole;
step 7, connecting a standard penetrometer by a test bar and passing through the drilling rod and the outer barrel assembly to be sent to a bottom of the drilling hole;
step 8, connecting a top end of the test bar with a standard penetration hammer base, and carrying out a standard penetration test by utilizing a standard penetration hammer above the test bar to hit the standard penetration hammer base; and step 9, utilizing a main winch to lift out the standard penetrometer after the standard penetration test is finished.
2. The engineering geological drilling construction method based on a wire line coring drilling tool as claimed in claim 1, wherein in step 4 and step 6, the whole drilling tool is lifted by the oil cylinder from the hole bottom for a predetermined distance to pull off the rock cores, and the predetermined distance is 100 mm.
3. The engineering geological drilling construction method based on a wire line coring drilling tool as claimed in claim 1 or claim 2, wherein the minimum inner diameter of the outer barrel assembly is greater than the maximum outer diameter of the standard penetrometer.
4. The engineering geological drilling construction method based on a wire line coring drilling tool as claimed in claim 3, wherein the minimum inner diameter of the outer barrel assembly is no less than 56 mm, and the maximum outer diameter of the standard penetrometer is no greater than mm.
5. The engineering geological drilling construction method based on a wire line coring drilling tool as claimed in any one of claims 1 to 4, wherein the outer diameter of the coring bit is 75.7 mm, and the inner diameter of the coring bit is 56 mm.
6. The engineering geological drilling construction method based on a wire line coring drilling tool as claimed in any one of claims 1 to 5, wherein in step 2, by adjusting a length of the inner barrel assembly, the inner barrel assembly and a step part of an inner wall of the drilling bit are not in contact with each other, and a water-passing gap is no greater than 1 mm.
7. The engineering geological drilling construction method based on a wire line coring drilling tool as claimed in any one of claims 1 to 6, wherein in the step 8, the standard penetration hammer base is hit by the standard penetration hammer in a manner of free falling.
8. The engineering geological drilling construction method based on a wire line coring drilling tool as claimed in any one of claims 1 to 7, wherein in the step 8, during the standard penetration test, the drilling rod and the outer barrel assembly remain still in the drilling hole.
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| CA3004688A CA3004688C (en) | 2018-05-10 | 2018-05-10 | An engineering geological drilling construction method based on wire line coring drilling tool |
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| CA3004688A CA3004688C (en) | 2018-05-10 | 2018-05-10 | An engineering geological drilling construction method based on wire line coring drilling tool |
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| CN111550211A (en) * | 2020-06-05 | 2020-08-18 | 四川大学 | Oil bath type internal and external temperature control fidelity corer experiment platform |
| CN111577184A (en) * | 2020-06-08 | 2020-08-25 | 四川大学 | Rotary type fidelity corer experiment platform |
| CN111894502B (en) * | 2020-07-28 | 2023-03-10 | 四川大学 | Method for coring tunnel with gas as fluid medium |
| CN113530452B (en) * | 2021-08-25 | 2023-10-27 | 广州海洋地质调查局 | Retractable drill bit and drilling tool equipment for ocean drilling |
| CN117167000B (en) * | 2023-11-02 | 2024-01-02 | 山西地丘环境科技有限公司 | Soil sampling device and soil sampling method for geological survey |
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