CN115478525A - In-hole standard penetration test hammer applied to deep stratum test and test method - Google Patents
In-hole standard penetration test hammer applied to deep stratum test and test method Download PDFInfo
- Publication number
- CN115478525A CN115478525A CN202211010562.5A CN202211010562A CN115478525A CN 115478525 A CN115478525 A CN 115478525A CN 202211010562 A CN202211010562 A CN 202211010562A CN 115478525 A CN115478525 A CN 115478525A
- Authority
- CN
- China
- Prior art keywords
- hole
- hammer
- standard penetration
- penetration
- standard
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
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
-
- 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
Abstract
The invention discloses an in-hole standard penetration test hammer applied to deep stratum testing. The device comprises a standard penetration test hammer in a hole and a guide device in the hole; the standard penetration test hammer in the hole comprises a standard penetration hammer in the hole and an inner rod of the penetration hammer; the upper end of an inner rod of the penetration hammer extends upwards to form a standard penetration hammer in the hole, the upper end of the inner rod of the penetration hammer is respectively connected with the measuring rope and the steel wire rope, and the lower end of the inner rod extends downwards to form a standard penetration hammer in the hole; the connecting rod is connected with the standard penetration device; the in-hole guide device is respectively arranged at the upper end of an inner rod of the penetration hammer and the joint of the connecting rod and the standard penetration device; the in-hole guide device is of a structure with two concave ends and a convex middle part; the outer convex part of the in-hole guide device is tightly attached to the wall of the drilled hole; the concave part is positioned at the outer side of the connecting rod and clings to the connecting rod. The invention has the advantages of small volume and capability of completing the standard penetration test in the drill hole. The invention discloses a standard penetration test method of an in-hole standard penetration test hammer applied to deep stratum testing.
Description
Technical Field
The invention relates to the technical field of engineering drilling tests, in particular to an in-hole standard penetration test hammer applied to deep stratum tests, and more particularly to a standard penetration test hammer which is small in size and can move in a drill hole to complete a standard penetration test. The invention also relates to a standard penetration test method of the standard penetration test hammer in the hole, which is applied to deep stratum test.
Background
The problem of deep and thick covering layers is frequently encountered in constructing reservoir dams and deep-buried tunnels, and the properties of the covering layers are key factors influencing the safe operation of the dams and the construction safety of the tunnels, so the properties of the deep and thick covering layers must be found out. The existing overlay testing techniques are: the method comprises the steps of taking an original soil sample, performing a static sounding test, performing a standard penetration test, performing a cross plate shearing test and performing a side pressure test. The original soil sample, the static sounding test, the cross plate shearing test and the existing standard penetration test are not suitable for testing deep strata, particularly deep sand layers and sand pebbles. The lateral pressure test has high requirement on the integrity of the hole wall of the drill hole, and the hole wall of a sand layer and a sandy gravel stratum is incomplete, so the lateral pressure test is not suitable for the sand layer and the sandy gravel stratum in the deep part of the stratum.
At present, in the field of engineering geological exploration, the stratum buried depth of a drilling standard penetration test is generally less than 20m, and the maximum corrected depth of a standard penetration rod length with clear domestic relevant specifications is 21m. In addition, the standard penetration device adopts a drill rod to be put into the bottom of the hole, the impact energy of the standard penetration hammer above the ground is transmitted to the standard penetration device at the bottom of the hole through the drill rod, the larger the length of the rod is, the larger the impact energy loss is, and the obtained test data cannot represent the real properties of the deep stratum and cannot be applied.
Deep formation testing is a difficult problem which has plagued large-scale engineering surveys for a long time. There is currently no suitable testing technique for testing deep formations.
Therefore, there is a need to develop a downhole standard penetration test hammer that can perform deep formation testing.
Disclosure of Invention
The invention aims to provide a standard penetration test hammer in a hole, which is applied to deep stratum test, has small volume, can move in a drill hole to complete a standard penetration test, and has strong applicability.
The second purpose of the invention is to provide a standard penetration test method of the standard penetration test hammer in the hole, which is applied to deep stratum test, the standard penetration test hammer is changed from a test completed by surface motion to a test completed by in-hole motion, the test data is accurate, rod length conversion is not needed, and the operation is simple.
In order to achieve the first object of the present invention, the technical solution of the present invention is: the utility model provides a be applied to downthehole standard penetration test hammer of deep stratum test which the difference lies in: the standard penetration test hammer applied to deep stratum testing is used in a drill hole;
the standard penetration test hammer applied to deep stratum testing comprises a standard penetration test hammer in the hole and a guide device in the hole;
the standard penetration test hammer in the hole is a punching hammer;
the standard penetration test hammer in the hole comprises a standard penetration hammer in the hole and an inner rod of the penetration hammer;
a standard penetration hammer is arranged in a through hole of the penetration hammer inner rod; the upper end of an inner rod of the injection hammer extends upwards out of the hole and is connected with the measuring rope, and the lower end of the inner rod of the injection hammer extends downwards out of the hole and is connected with the connecting rod through a hammering base; the connecting rod is connected with the standard penetration device;
the in-hole guide device is used for enabling the standard penetration device and the penetration hammer inner rod to be completely positioned in the center of the drill hole; the in-hole guide devices are respectively arranged at the upper end of the inner rod of the penetration hammer and the connecting position of the connecting rod and the standard penetration device;
the in-hole guide device is of a structure with two concave ends and a convex middle part; the diameter of the convex part of the in-hole guide device is smaller than the bore diameter of the drill hole and is tightly attached to the wall of the drill hole;
the concave parts are positioned at the outer sides of the connecting rods and are respectively clung to the connecting rods.
In the technical scheme, symmetrical crescent structures are arranged on two sides of the standard penetration hammer in the hole, so that a flow channel is provided for slurry in the hole when the standard penetration hammer in the hole moves in the hole, and a through hole is formed in the middle of the standard penetration hammer; the inner rod of the penetration hammer is positioned in the through hole.
In the technical scheme, the outer diameter of a standard penetration hammer in a hole is 80mm, the diameter of an inner rod is less than 25mm, the length of the inner rod is 1760mm, and the stroke of the inner rod is 760mm; a hammer is inserted into the hole in a standard way, and the weight of the hammer is 67.43kg;
the standard penetration hammer in the hole is made of high-density metal such as tungsten, platinum, osmium and the like.
In the technical scheme, the in-hole guiding device comprises an elastic metal reed and a reed base;
the reed base is in a circular structure;
a plurality of elastic metal reeds are annularly embedded on the reed base;
the middle part of the reed base is provided with a round hole with a screw thread, and the reed base is connected with the upper end of the standard injection hammer and the upper end of the standard injection device in the hole through the screw thread
The elastic metal reed is of an elastic structure with two concave ends and a convex middle part;
the diameter of the convex part of the elastic metal reed is smaller than the aperture of the drilled hole; the convex part of the elastic metal reed is closely attached to the wall of the drilled hole.
In the technical scheme, each elastic metal reed is 1cm wide and 15cm long.
In the above technical solution, the in-hole guiding means includes a first in-hole guiding means and a second in-hole guiding means;
the first in-hole guide device is positioned at the upper end of the inner rod of the penetration hammer;
the second in-hole guide device is positioned at the upper end of the standard penetration device;
the measuring rope is connected to the upper surface of the base of the first in-hole guide device;
the standard penetrometer is connected to the lower surface of the base of the second hole guiding device.
In the technical scheme, the hammering base adopts a metal base with the diameter of 6 cm.
In the technical scheme, the standard penetration hammer and the standard penetration device in the hole are connected by a steel wire rope to drill the hole;
the middle part of the winch of the drilling machine is provided with an annular steel plate, one part of the annular steel plate is wound on a thick steel wire rope for drilling, and the other part of the annular steel plate is wound on a thin steel wire rope for deep hole standard penetration test.
In order to achieve the second object of the present invention, the technical solution of the present invention is: the standard penetration test method of the standard penetration test hammer in the hole applied to the deep stratum test is characterized in that: comprises the following steps of (a) carrying out,
when a soft soil layer is tested by adopting gravity penetration test, the standard penetration test hammer in the hole applied to the deep stratum test adopts a standard penetration device, a standard penetration test hammer in the hole and a guide device in the hole;
when the sand gravel layer is tested by adopting gravity penetration, the standard penetration device is changed into a gravity penetration probe, namely the gravity penetration probe, the in-hole standard penetration test hammer and the in-hole guiding device are adopted when the method is applied to the deep stratum test;
connecting an in-hole standard penetration test hammer (comprising an in-hole standard penetration hammer, a penetration hammer inner rod, a hammering base and the like) with an in-hole guide device with a standard penetration device;
secondly, lowering the connected standard injection hammer and standard injector in the hole to the bottom of the drill hole by using a steel wire rope;
thirdly, testing the bottom depth of the standard penetration device by using a measuring rope, repeatedly lifting the hole by using a steel wire rope, and hammering the base by standard penetration hammering until the standard penetration device enters the soil layer at the bottom of the drilled hole by 15 cm; the lifting height is less than 70cm each time;
slowly placing the standard injection hammer in the hole to the hammering base by using a steel wire rope, marking the hole of the steel wire rope, lifting the steel wire rope to enable the marked part of the steel wire rope to rise by 76cm, quickly putting down, striking the hammering base, and recording the injection depth;
repeating the step four until the total depth of penetration is 30cm;
and step five, taking out the standard penetration test hammer (including the standard penetration hammer in the hole, the inner rod of the penetration hammer, the hammering base and the like) and the standard penetration device from the drill hole.
In the technical scheme, in the third step, the lifting height of the hole is less than 70cm each time when the hammering base is hit by the standard injection hammer.
"deep formation" in the present invention means a formation having a depth of 200m or more; the invention can test the depth more than or equal to 200m.
The invention has the following advantages:
(1) The invention has small volume and can move up and down in the drill hole (the volume of the standard penetration test hammer in the hole applied to the deep stratum test is 3.47 liters, the diameter is about 8 centimeters, and the drill hole is generally only 11 centimeters, so the invention can move up and down in the drill hole); finishing a standard penetration test by using a steel wire rope; a guide device is adopted to enable the standard penetration device and the penetration hammer inner rod to be vertical to the center of the drill hole; the hammer for standard penetration test in hole is made of high-density metal material, and has weight of 67kg and volume of 3500cm 3 Completing a deep stratum standard penetration test by adopting a steel wire rope (without a drill rod); the problem of inaccurate test data caused by large energy loss of a deep stratum standard penetration test is solved, the problem that the deep stratum standard penetration test cannot be corrected accurately is also solved, and the method has important significance for engineering construction investigation of deep overburden area; the defects that in the prior art, a drill rod is connected with a standard penetration device and is placed to a test stratum, the size is large (the existing standard penetration test hammer is positioned on the ground surface during testing and is connected with the standard penetration device through the drill rod, the volume of the penetration hammer is 8.14 liters, the diameter of the penetration hammer is about 20 centimeters, a drill hole is generally only 11 centimeters, and the existing standard penetration test hammer cannot be put into the drill hole for testing) so that the measurement cannot be carried out, or the energy loss of the deep stratum standard penetration test is large, and the obtained test data cannot be utilized are overcome;
(2) According to the invention, the stratum test is carried out by impacting the drill rod by the standard penetration hammer above the ground, and the stratum test is carried out by impacting the standard penetration hammer at a certain height above the bottom of the inner hole of the drill hole, so that the test accuracy is improved, and the correction calculation of the rod length is not needed; in addition, the steel wire rope is adopted to complete the test (without a drill rod), and the drilling and the lifting are not needed, so that the working efficiency is greatly improved.
Drawings
FIG. 1 is a schematic view of the present invention.
FIG. 2 is a schematic diagram of a hole internal Standard penetration hammer according to the present invention.
Fig. 3 is a schematic structural view of the in-hole guide device of the present invention.
In the figure, 1-a steel wire rope, 2-a measuring rope, 3-an in-hole guiding device, 3.1-an elastic metal reed, 3.2 reed bases, 3.21-a round hole with a screw thread, 3A-a first in-hole guiding device, 3B-a second in-hole guiding device, 4-an in-hole standard injection hammer, 4.1-a through hole, 4.2-a crescent structure, 5-an in-injection hammer inner rod, 6-a hammering base, 7-a connecting rod and 8-a standard injection device.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the drawings, but the present invention is not limited to these embodiments. While the advantages of the invention will be clear and readily understood by the description.
The standard penetration test hammer in the hole comprises the following components from bottom to top: the connecting screw thread, the penetrating hammer base, the inner rod of the penetrating hammer, the penetrating hammer (namely the standard penetrating hammer 4 in the hole) on the periphery of the inner rod and the penetrating hammer, and the steel wire rope 1 connected to the penetrating hammer; the upper part and the lower part of the standard penetration test hammer in the hole are respectively connected with a guide device 3 in the hole, and the lower end of the guide device 3 in the hole at the lower part is connected with a standard penetration device 8. The invention has small volume and can move up and down in the drill hole; finishing a standard penetration test by using a steel wire rope; and a guide device is adopted to enable the standard penetration device and the penetration hammer inner rod to be vertical to the center of the drill hole. According to the invention, through modifying the material, shape, size and other auxiliary facilities of the standard penetration hammer, the aim of transferring the hammering motion of the standard penetration test from above the ground to the deep part of the drilled hole is realized, and the problems of inaccurate deep stratum test data and incapability of correcting are solved.
The heavy metal with high density is adopted to manufacture the punching hammer, the weight of the punching hammer is basically consistent with that of the existing standard injection hammer, the drop distance is consistent, and compared with the existing accurate standard injection test, the deviation is smaller; the punching hammer (the weight is about 67 kg) made of heavy metal with high density is basically consistent with the existing standard penetrating hammer, the drop distance is basically consistent with the existing standard penetrating hammer (the drop distance of the punching hammer is about 0.76 m), the drop distance is shorter, and the influence of the inclination of the drilled hole on the test result can be greatly reduced, so that the punching hammer is suitable for drilling with the inclination angle of less than or equal to 4 degrees (namely the punching hammer is suitable for inclined drilling); the defects that the weight (generally, the weight is 10kg or 15 kg) of the piercing hammer in the prior art is less than the weight (about 63.5 kg) of the existing standard penetration hammer, the drop distance (about 3.217 m) of the piercing hammer in the prior art is far greater than the drop distance (about 0.76 m) of the hammer in the existing standard penetration test, the piercing hammer in the prior art is influenced by the inclination of a drill hole in the dropping process due to the large drop distance, the piercing hammer in the hole is difficult to keep a free-falling body state, and the piercing hammer collides and rubs with the hole wall of the drill hole and the center rod of the piercing hammer, reduces the actual impact energy, has large influence on the accuracy of the test result, has larger deviation compared with the existing accurate standard penetration test, and causes the accuracy of the test result in the prior art to be low are overcome; meanwhile, the device is only provided with a few devices, only a ground hoisting system and a standard penetration test hammer in the hole applied to deep stratum testing are needed, the structure is simple, and the operation, the popularization and the application are convenient; the defect that in the prior art, more devices are needed (a mud pulser, a battery, a motor and the like are needed to be additionally added) and the popularization and the application are difficult in practical application is overcome.
With reference to the accompanying drawings: the utility model provides an in-hole standard penetration test hammer for deep stratum test which characterized in that: use in a borehole;
the standard penetration test hammer applied to deep stratum test comprises a standard penetration test hammer in the hole and a guide device in the hole;
the standard penetration test hammer in the hole is a punching hammer;
the standard penetration test hammer in the hole comprises a standard penetration hammer 4 in the hole and an inner rod 5 of the penetration hammer;
a standard penetration hammer 4 is arranged in a through hole of the penetration hammer inner rod 5; the upper end of an inner rod 5 of the penetration hammer extends upwards out of the hole and is connected with a standard penetration hammer 4 and a measuring rope 2, and the lower end of the inner rod extends downwards out of the hole and is connected with a connecting rod 7 through a hammering base 6; the connecting rod 7 is connected with a standard penetration device 8;
the in-hole guide device 3 is used for enabling the standard penetration device 8 and the penetration hammer inner rod to be completely positioned in the center of a drill hole, and when the test equipment is placed at the bottom of the drill hole by adopting a steel wire rope, effective impact energy is reduced in order to avoid the standard penetration test hammer from rubbing the hole wall; the in-hole guide device 3 is arranged at the joint of the connecting rod 7 and the standard injector 8 and is respectively positioned at the upper end of the injection hammer inner rod 5 and the upper end of the standard injector 8;
the in-hole guide device 3 is of a structure with two ends concave inwards and the middle part convex outwards; the diameter of the convex part of the in-hole guide device 3 is smaller than the bore diameter of the drill hole and is tightly attached to the wall of the drill hole;
the concave part is positioned on the outer side of the connecting rod 7 and is tightly attached to the connecting rod 7, the measuring rope 2 adopts a suspended steel wire rope, the measuring device realizes measurement of the penetration depth of the test by measuring the length of the suspended steel wire rope, is simple and convenient to operate, and meets the measurement requirement of the stratum with the depth of more than or equal to 200m.
Furthermore, symmetrical crescent structures 4.2 are arranged on two sides of the standard penetration hammer 4 in the hole, so that a gap between the penetration hammer and the hole wall is enlarged, the resistance of the relative movement of the ground water during the test to the standard penetration test hammer is reduced, and a through hole 4.1 is arranged in the middle; the penetrating hammer inner rod 5 is positioned in the through hole 4.1. The two sides of the standard penetration hammer are arranged in a crescent shape, so that a channel is provided for slurry in a hole to move upwards when the penetration hammer moves downwards firstly.
Furthermore, the outer diameter of the standard penetration hammer 4 in the hole is 80mm, the diameter of the inner rod is less than 25mm, the length is 1760mm, and the stroke is 760mm; the standard penetration hammer 4 in the hole considers the influence of the buoyancy of underground water, and the weight of the hammer is 67.43kg;
the standard penetration hammer 4 in the hole is made of high-density metal such as tungsten, platinum, osmium and the like, the space in the hole is small, the volume of the standard penetration test hammer is limited, and only high-density metal such as tungsten with the density of 19.32g/cm can be adopted on the premise of ensuring enough weight 3 . The invention adopts heavy metal with high density to manufacture the standard penetration hammerThe size of the hammer is reduced, the hammer can conveniently move in a narrow drill hole, and a hammering test is facilitated.
Further, the in-hole guiding device 3 comprises an elastic metal reed 3.1 and a reed base 3.2;
the reed base 3.2 is of a circular structure and has the diameter of 8cm;
a plurality of elastic metal reeds 3.1 are annularly embedded on the reed base 3.2;
the middle part of the reed base 3.2 is provided with a round hole 3.21 with screw threads, and the reed base 3.2 is connected with the upper end of the inner rod 5 of the penetration hammer and the upper end of the standard penetration device 8 through the screw threads;
the elastic metal reed 3.1 is of an elastic structure with two concave ends and a convex middle part;
the diameter of the convex part of the elastic metal reed 3.1 is smaller than the bore diameter of the drilling hole (the diameter of the convex part is smaller than the bore diameter of the drilling hole by 0.5 cm); the convex part of the elastic metal reed 3.1 is closely attached to the wall of the drilled hole, so that the inner rod in the middle part of the hole of the middle part of the hole is kept centrally vertical; when the uneven parts of the hole wall are met, the deformation of the reed ensures that the standard penetration test device can smoothly reach the test position.
Further, each elastic metal reed 3.1 has a width of about 1cm and a length of about 15cm, and has certain rigidity and better elasticity. The invention is provided with the elastic metal reed, so that the penetrating hammer can vertically strike the hammering base under the condition of not using a drill rod for connection.
Further, the in-hole guide 3 includes a first in-hole guide 3A and a second in-hole guide 3B;
the first in-hole guide device 3A is positioned at the upper end of the inner rod 5 of the penetration hammer;
the second in-hole guide device 3B is positioned at the upper end of the standard penetration device 8;
the measuring rope 2 is connected to the upper surface of the base of the first hole guiding device 3A, and the penetration depth is measured by the measuring rope.
The spud 8 is attached to the lower surface of the base of the second in-hole guide 3B.
Further, the hammering base 6 adopts a metal base with the diameter of 6 cm; properly reduce the area of hammering base, reduce downthehole silt and deposit probability above the base, avoid base upper portion as far as possible to have the influence of silt to experimental effect.
Further, the standard penetration hammer 4 and the standard penetration device 8 in the hole are connected by a steel wire rope to enter the hole to be drilled;
an annular steel plate is arranged in the middle of the winch of the drilling machine, a part of the annular steel plate is wound on a thick steel wire rope with the diameter of about 1cm for drilling, and the other part of the annular steel plate is wound on a thin steel wire rope with the diameter of about 0.5cm for deep hole standard penetration test; when necessary, the two steel wire ropes can be connected for use, so that the test depth requirement of the invention is met; the invention adopts the steel wire rope to complete the standard penetration test, does not adopt a drill rod to transfer force, and has high work efficiency compared with the conventional standard penetration test. The thick steel wire rope is used for normal drilling, and the thin steel wire rope is specially used for standard penetration tests in holes, because the hole depth is large, the adopted thin steel wire rope is small in size and light in weight, so that an operator can accurately sense the time of the standard penetration device reaching the bottom of a drill hole, and the measurement accuracy is improved.
In the standard penetration test in the prior art, a drill rod is connected with a standard penetration device and is placed in a test stratum, and a steel wire rope is used for placing the standard penetration device and a standard penetration hammer connected with the standard penetration device into the test stratum; the invention adopts the steel wire rope to replace the drill rod, so that the working procedures of connecting the drill rod when the drill rod is put down and disassembling the drill rod when the drill rod is put out in the prior art, particularly deep hole testing, are reduced, the time for putting the drill rod into and disassembling the drill rod each time is 3-4 hours in the prior art, while the time for putting the drill rod into and disassembling the drill rod is less than 1 hour in the invention, and the working efficiency is greatly improved.
With reference to the accompanying drawings: the standard penetration test method of the standard penetration test hammer in the hole applied to the deep stratum test is characterized in that: comprises the following steps of (a) carrying out,
when a soft soil layer is tested by adopting gravity penetration, the standard penetration test hammer in the hole applied to the deep stratum test adopts a standard penetration device 8, a standard penetration test hammer in the hole and a guide device 3 in the hole;
when the sand gravel layer is tested by adopting gravity penetration, the standard penetration device 8 is changed into a gravity penetration probe, namely the gravity penetration probe, the in-hole standard penetration test hammer and the in-hole guiding device 3 are adopted when the method is applied to deep stratum testing;
firstly, connecting an in-hole standard penetration test hammer (comprising an in-hole standard penetration hammer 4, an inner rod 5 of the penetration hammer, a hammering base 6 and the like) with an in-hole guide device 3 with a standard penetration device 8;
step two, the connected standard penetration hammer 4 and the standard penetration device 8 in the hole are lowered to the bottom of the drill hole by using a steel wire rope 1;
thirdly, testing the bottom depth of the standard penetration device 8 by using a measuring rope 2, repeatedly lifting the standard penetration hammer 4 in the hole by using a steel wire rope 1 to strike the hammering base 6 until the standard penetration device 8 enters the soil layer at the bottom of the drill hole by 15 cm; the lifting height is less than 70cm each time;
fourthly, slowly placing the standard penetration hammer 4 in the hole to the hammering base 6 by using the steel wire rope 1, marking the hole opening of the steel wire rope 1, lifting the steel wire rope 1 to enable the marking position of the steel wire rope 1 to rise by 76cm, quickly putting down the steel wire rope, striking the hammering base 6, and recording the downward moving depth (namely the downward penetration depth of the lower standard penetration device 8) of the mark on the steel wire;
repeating the step four until the total depth of penetration is 30cm;
taking out the standard penetration test hammer (comprising the standard penetration hammer 4, the penetration hammer inner rod 5, the hammering base 6 and the like) and the standard penetration device 8 from the drill hole;
and when the sand gravel layer is tested by adopting gravity penetration, the standard penetration device 8 is replaced by a gravity penetration probe, and the operation is carried out according to the steps.
Further, in the third step, the elevation height of the standard penetration hammer 4 in the hole is less than 70cm each time the hammer base 6 is hit.
Other parts not described belong to the prior art.
Claims (10)
1. The utility model provides an in-hole standard penetration test hammer for deep stratum test which characterized in that: use in a borehole;
the standard penetration test hammer applied to deep stratum test comprises a standard penetration test hammer in the hole and a guide device in the hole;
the standard penetration test hammer in the hole is a punching hammer;
the standard penetration test hammer in the hole comprises a standard penetration hammer (4) in the hole and an inner rod (5) of the penetration hammer;
a standard penetration hammer (4) is arranged in a through hole of the penetration hammer inner rod (5); the upper end of the inner rod (5) of the injection hammer upwards extends out of the standard injection hammer (4) in the hole and is connected with the measuring rope (2), and the lower end of the inner rod of the injection hammer downwards extends out of the standard injection hammer (4) in the hole and is connected with a connecting rod (7) through a hammering base (6); the connecting rod (7) is connected with the standard penetration device (8);
the in-hole guide device 3 for enabling the standard penetrometer (8) and the inner rod (5) of the penetration hammer to be completely positioned in the center of a drill hole is respectively arranged at the upper end of the inner rod (5) of the penetration hammer and the connecting position of the connecting rod (7) and the standard penetrometer (8);
the in-hole guide device (3) is of a structure with two concave ends and a convex middle part; the diameter of the convex part of the in-hole guide device (3) is smaller than the bore diameter of the drill hole and is tightly attached to the wall of the drill hole;
the concave part is positioned at the outer side of the connecting rod (7) and is tightly attached to the connecting rod (7).
2. A downhole standard penetration test hammer for deep formation testing according to claim 1, wherein: two sides of the standard penetration hammer (4) in the hole are provided with symmetrical crescent-shaped structures (4.2), and the middle part is provided with a through hole (4.1); the penetrating hammer inner rod (5) is positioned in the through hole (4.1).
3. A downhole standard penetration test hammer for deep formation testing according to claim 1, wherein: the outer diameter of a standard penetration hammer (4) in the hole is 80mm, the diameter of an inner rod is less than 25mm, the length is 1760mm, and the stroke is 760mm; the weight of the standard penetration hammer (4) in the hole is 67.43kg;
the material of the standard penetration hammer (4) in the hole selects high-density metals such as tungsten, platinum and osmium.
4. A downhole standard penetration test hammer for deep formation testing according to claim 3, wherein: the in-hole guiding device (3) comprises an elastic metal reed (3.1) and a reed base (3.2);
the reed base (3.2) is of a circular structure;
a plurality of elastic metal reeds (3.1) are annularly embedded on the reed base (3.2);
the middle part of the reed base (3.2) is provided with a round hole (3.21) with a screw thread, and the reed base (3.2) is connected with the upper end of the inner rod (5) of the penetration hammer and the upper end of the standard penetration device (8) through the screw thread;
the elastic metal reed (3.1) is of an elastic structure with two concave ends and a convex middle part;
the diameter of the convex part of the elastic metal reed (3.1) is smaller than the aperture of the drilled hole; the convex part of the elastic metal reed (3.1) is closely attached to the wall of the drilled hole.
5. A downhole standard penetration test hammer for deep formation testing according to claim 4, wherein: the width of the elastic metal reed (3.1) is 1cm, and the length is 15cm.
6. The downhole standard penetration test hammer of claim 5, for use in deep formation testing, wherein: the in-hole guide device (3) comprises a first in-hole guide device (3A) and a second in-hole guide device (3B);
the first in-hole guide device (3A) is positioned at the upper end of the penetrating hammer inner rod (5);
the second in-hole guide device (3B) is positioned at the upper end of the standard penetration device (8);
the measuring rope (2) is connected to the upper surface of the base of the first in-hole guide device (3A);
the standard penetration device (8) is connected to the lower surface of the base of the second in-hole guide device (3B).
7. An in-hole standard penetration test hammer for deep formation testing according to claim 6, wherein: the hammering base (6) adopts a metal base with the diameter of 6 cm.
8. The downhole standard penetration test hammer of claim 7, for use in deep formation testing, wherein: and the standard penetration hammer (4) and the standard penetration device (8) in the hole are connected by a steel wire rope (1) and then drilled in the hole.
9. The method of any one of claims 1 to 8, wherein the method comprises the steps of: comprises the following steps of (a) carrying out,
when a soft soil layer is tested by adopting gravity penetration, the standard penetration test hammer in the hole applied to the deep stratum test adopts a standard penetration device (8), a standard penetration test hammer in the hole and a guide device (3) in the hole;
when the sand gravel layer is tested by adopting gravity penetration, the standard penetration device (8) is changed into a gravity penetration probe, namely the gravity penetration probe, the in-hole standard penetration test hammer and the in-hole guiding device (3) are adopted when the gravity penetration test hammer is applied to the deep stratum test;
step one, connecting a standard penetration test hammer with a guide device (3) in a hole with a standard penetration device (8);
step two, the connected standard penetration hammer (4) and the standard penetration device (8) in the hole are lowered to the bottom of the drilled hole by a steel wire rope (1);
thirdly, testing the bottom depth of the standard penetration device (8) by using a testing rope (2), repeatedly lifting the in-hole standard penetration hammer (4) by using a steel wire rope (1) to strike the hammering base (6) until the standard penetration device (8) enters the bottom soil layer of the drill hole for 15 cm;
slowly placing the standard penetration hammer (4) in the hole to the hammering base (6) by using the steel wire rope (1), marking the hole opening of the steel wire rope (1), lifting the steel wire rope (1), enabling the marked part of the steel wire rope (1) to rise by 76cm, quickly placing the steel wire rope down, striking the hammering base (6), and recording the penetration depth;
repeating the step four until the total depth of penetration is 30cm;
and step five, taking the standard penetration test hammer and the standard penetration device (8) out of the drill hole.
10. The method of claim 9 for a downhole standard penetration test hammer for deep formation testing, wherein: in the third step, the lifting height of the standard penetration hammer (4) in the hole is less than 70cm each time the hammering base (6) is hit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211010562.5A CN115478525A (en) | 2022-08-23 | 2022-08-23 | In-hole standard penetration test hammer applied to deep stratum test and test method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211010562.5A CN115478525A (en) | 2022-08-23 | 2022-08-23 | In-hole standard penetration test hammer applied to deep stratum test and test method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115478525A true CN115478525A (en) | 2022-12-16 |
Family
ID=84421264
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211010562.5A Pending CN115478525A (en) | 2022-08-23 | 2022-08-23 | In-hole standard penetration test hammer applied to deep stratum test and test method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115478525A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040065453A1 (en) * | 2002-10-07 | 2004-04-08 | Jiin-Song Tsai | Downhole sampling method and device used in standard penetration test |
| KR20080081423A (en) * | 2007-03-05 | 2008-09-10 | 한국건설기술연구원 | Penetration test apparatus for geotechnical site investigation |
| CN202850007U (en) * | 2012-09-24 | 2013-04-03 | 中铁建设集团有限公司 | Shallow stratum multipoint settlement real-time monitoring device |
| CN106087936A (en) * | 2016-07-28 | 2016-11-09 | 南京铁道职业技术学院 | Hammering thin-walled low-resistance soil sampler at the bottom of a kind of electromagnetism frequency modulation type hole |
| CN106436674A (en) * | 2016-11-03 | 2017-02-22 | 中国水利水电科学研究院 | Method for discriminating sand-gravel stratum liquefaction through standard penetration test |
| US20170306708A1 (en) * | 2015-04-10 | 2017-10-26 | Abhishek AVASTHI | A centralizer with low friction buttons and method of fabrication thereof |
| CN107941555A (en) * | 2017-11-20 | 2018-04-20 | 中国矿业大学 | A kind of well depthkeeping degree water-bearing layer water sampler that can determine whether underground water cross strata pollution |
| CN210013203U (en) * | 2019-05-08 | 2020-02-04 | 天津市勘察院 | Automatic recording device for standard penetration |
-
2022
- 2022-08-23 CN CN202211010562.5A patent/CN115478525A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040065453A1 (en) * | 2002-10-07 | 2004-04-08 | Jiin-Song Tsai | Downhole sampling method and device used in standard penetration test |
| KR20080081423A (en) * | 2007-03-05 | 2008-09-10 | 한국건설기술연구원 | Penetration test apparatus for geotechnical site investigation |
| CN202850007U (en) * | 2012-09-24 | 2013-04-03 | 中铁建设集团有限公司 | Shallow stratum multipoint settlement real-time monitoring device |
| US20170306708A1 (en) * | 2015-04-10 | 2017-10-26 | Abhishek AVASTHI | A centralizer with low friction buttons and method of fabrication thereof |
| CN106087936A (en) * | 2016-07-28 | 2016-11-09 | 南京铁道职业技术学院 | Hammering thin-walled low-resistance soil sampler at the bottom of a kind of electromagnetism frequency modulation type hole |
| CN106436674A (en) * | 2016-11-03 | 2017-02-22 | 中国水利水电科学研究院 | Method for discriminating sand-gravel stratum liquefaction through standard penetration test |
| CN107941555A (en) * | 2017-11-20 | 2018-04-20 | 中国矿业大学 | A kind of well depthkeeping degree water-bearing layer water sampler that can determine whether underground water cross strata pollution |
| CN210013203U (en) * | 2019-05-08 | 2020-02-04 | 天津市勘察院 | Automatic recording device for standard penetration |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105181199B (en) | A kind of side hole stress relief method of detecting earth stress | |
| CN105887947A (en) | Deviation rectification method and device for pile foundation inclination | |
| CN106522928A (en) | Pump stopping wellhead pressure drop measuring transient well test method after acid fracturing | |
| CN110705095A (en) | Karst ground collapse analysis method | |
| CN109537580A (en) | A kind of engineering pile body design and construction method based on BIM technology | |
| CN107700479A (en) | A kind of construction method of large diameter drill hole pile | |
| CN117552483B (en) | Test method for foundation reinforcement influence range of dynamic compaction treatment | |
| Jumabayeva | CONTROL OF UNDERGROUND WATER IN THE MINE, DETECTION AND PREVENTION OF RISKS | |
| CN104453705B (en) | Secondary forming method for large-hole-diameter cast-in-place pile rotary drilling rig | |
| Ebelhar et al. | Cone penetrometer and conductor pullout tests in carbonate soils offshore Africa | |
| CN115627746B (en) | Confined water stratum foundation pit anti-surging safety assessment method based on in-situ test | |
| CN115478525A (en) | In-hole standard penetration test hammer applied to deep stratum test and test method | |
| CN206693258U (en) | Hold type rigid pile composite foundation structure in a kind of end | |
| CN114775671A (en) | Large-diameter precast tubular pile construction method under complex geology | |
| CN113482562A (en) | Covering layer core-taking touch probe test device and using method | |
| Stringer et al. | Experience with gel-push sampling in New Zealand | |
| CN113530443B (en) | Vertical drilling method for large-diameter life-saving hole | |
| Wentz et al. | Pore pressure response during high frequency sonic drilling and SPT sampling in liquefiable sand | |
| CN210239607U (en) | Drilling device | |
| CN113106997B (en) | Pile foundation construction method for pre-drilling guide hole in inclined rock stratum | |
| CN220813770U (en) | Soil hole grouting effect detection device | |
| CN103469779A (en) | Standard penetration test device for partitioning rock weathering degree | |
| CN213448408U (en) | Multifunctional portable drill rod detector | |
| CN105332668B (en) | Percussion Piles bit freezing processing unit and method | |
| CN113756802B (en) | Method for investigating fracturing drainage effect of coal bed gas horizontal well |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |