CN108844792B - Lifting type undisturbed soil triaxial sample preparation process - Google Patents
Lifting type undisturbed soil triaxial sample preparation process Download PDFInfo
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- CN108844792B CN108844792B CN201810620908.0A CN201810620908A CN108844792B CN 108844792 B CN108844792 B CN 108844792B CN 201810620908 A CN201810620908 A CN 201810620908A CN 108844792 B CN108844792 B CN 108844792B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
- G01N2001/2873—Cutting or cleaving
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Abstract
The invention discloses a lifting undisturbed soil triaxial sample preparation process, which comprises the following steps: firstly, judging the hardness of a soil sample according to the characteristics of the soil sample, and determining the cutting rotating speed of a cutting mechanism; then, placing the soil sample on a lifting mechanism, wherein the soil sample can rise under the driving of the lifting mechanism, and cutting the gradually rising soil sample through the rotation of a cutting blade of a cutting mechanism, so as to finish the primary manufacture of a triaxial sample; finally, the height of the lifting mechanism is reduced, the sample is taken out and is processed according to the required height, and the preparation of the sample is completed; the invention solves the problems of complicated operation steps, great influence by the operation proficiency of sample preparation personnel, low sample preparation efficiency, great disturbance to the soil sample in the sample preparation process, low sample preparation success rate and the like in the conventional sample preparation process.
Description
Technical Field
The application relates to a lifting undisturbed soil triaxial sample preparation process, and belongs to the technical field of indoor geotechnical testing of civil engineering discipline.
Background
At present, with the continuous development of the building industry, the mechanical property of the original soil on site needs to be determined at the beginning of the engineering, and a triaxial mechanical test is usually adopted so as to provide data for the design of a building structure. When undisturbed soil is subjected to triaxial mechanical test, a cylindrical soil body with the diameter of 150mm and the height of 200mm obtained on site needs to be made into a standard sample, and the standard sample is usually a cylinder with the diameter of 39.1mm and the height of 80 mm; to reduce the disturbance of the sample preparation process to the sample, a suitable sample preparation device, commonly referred to as a soil cutter or a sampler, must be used. At present, although a sample preparation device in a laboratory has the advantage of simple structure, the sample preparation device also has the problems of more workers, great influence of the operation proficiency of sample preparation personnel, low sample preparation success rate and the like. Researchers have made two improvements to these problems: one is a manual sample preparation device, such as' a soil cutter for enlarging a nail plate
CN 201520528779.4' reduces the influence of human factor through enlarging the lower nail dish, but does not overcome and is influenced by the sample preparation personnel operation proficiency greatly, and the sample preparation success rate is low shortcoming. The other is an electric sample preparation device, for example, an electric soil cutter-CN201320305738. X drives the soil sample to rotate through a rotating chassis, so that the operation steps are simplified, but the base always drives the soil sample to rotate in the sample preparation process, so that the soil sample is easy to deform, and the sample preparation success rate is low; the biaxial cutting multi-size soil cutter-CN 201710665814.0 completes the preparation of samples with various sizes by adding assembly accessories, but the sample preparation tool needs to be replaced, the requirement on the proficiency of operators is high, and the preparation of soil samples is easy to fail. To sum up, at present, the undisturbed soil sample preparation equipment has the problems that the operation steps are complicated, the influence of the operation proficiency of sample preparation personnel is large, the sample preparation efficiency is low, the disturbance to the soil sample in the sample preparation process is large, the sample preparation success rate is low and the like, and needs to be solved.
The present application was made based on this.
Disclosure of Invention
The invention provides a lifting undisturbed soil triaxial sample preparation process, which aims to solve the problems of complicated operation steps, great influence of operation proficiency of sample preparation personnel, low sample preparation efficiency, great disturbance to a soil sample in the sample preparation process, low sample preparation success rate and the like in the conventional sample preparation process.
The technical scheme adopted by the invention is as follows:
a lifting undisturbed soil triaxial sample preparation process is characterized by comprising the following steps: firstly, judging the hardness of a soil sample according to the characteristics of the soil sample, and determining the cutting rotating speed of a cutting mechanism; then, placing the soil sample on a lifting mechanism, wherein the soil sample can rise under the driving of the lifting mechanism, and cutting the gradually rising soil sample by the rotation of an annular cutting blade of a cutting mechanism to finish the primary manufacture of a triaxial sample; and finally, reducing the height of the lifting mechanism, taking out the sample, and processing according to the required height to finish sample preparation.
The invention drives the soil sample to lift through a hydraulic lifting mechanism, an annular rotatable cutting blade replaces manual cutting, and the annular cutting blade is adopted, so that the soil body can be directly cut into a cylindrical sample in the cutting process.
Further settings are as follows:
the lifting mechanism comprises a hydraulic lifting platform used for bearing the soil sample, a hydraulic lifting column, a lifting control switch and a speed control switch, wherein the hydraulic lifting platform moves up and down along with the hydraulic lifting column, and the lifting control switch and the speed control switch respectively control the lifting state and the lifting speed of the hydraulic lifting platform.
The hydraulic lifting platform is a round cake with the diameter of 120mm and the thickness of 20 mm; the hydraulic lifting column is a vertical telescopic cylinder, and the hydraulic lifting column and the center of the hydraulic lifting platform are on the same straight line; the nail dish rigid coupling is in the upper surface of hydraulic lifting platform, and the center aligns with hydraulic lifting platform center, the nail dish be a diameter 120mm, thickness 10 mm's cake, the upper surface evenly distributes has interval 10 mm's steel nail for bear the weight of soil sample.
The lifting control switch controls the lifting of the hydraulic lifting column and is divided into an upper gear, a middle gear and a lower gear; when the switch is positioned at the middle gear, the switch is in a closed state; when the switch is positioned at the upper gear, the switch is in a rising state; when the switch is positioned at a lower gear, the switch is in a descending state; the speed control switch is used for controlling the speed of the hydraulic lifting column; the switch is in a closed state when positioned in the middle gear; when the switch is positioned at the upper gear, the switch is in a fast state; when the switch is positioned at a lower gear, the switch is in a slow speed state.
The cutting mechanism comprises an annular cutting blade, the cutting blade is fixedly connected to a rotating chain in the cutting turntable, a connecting gear is connected with the rotating chain, and a rotating motor is connected with the connecting gear through a rotating shaft.
The cutting blade is an annular blade which is formed by surrounding 12 long and thin needle-shaped steel nails, the diameter of the upper end of the annular blade is 80mm, the diameter of the lower end of the annular blade is 39.1mm, the annular blade is fixedly connected to a rotating chain in the cutting turntable at equal intervals, and the rotating chain is driven to rotate through a rotating motor so as to drive the cutting blade to rotate.
A limiting mechanism is arranged above the cutting mechanism and used for positioning when the soil sample is cut, and the limiting mechanism comprises a limiting cylinder; the limiting cylinder is fixedly connected right above the cutting mechanism, the top cover on the limiting cylinder is arranged on the top surface of the limiting cylinder, the limiting disc is arranged inside the limiting cylinder, one end of the limiting rod is fixedly connected to the upper surface of the limiting disc, and the other end of the limiting rod passes through the hole in the center of the top cover on the limiting cylinder.
The limiting cylinder is a hollow cylinder with the inner diameter of 40.1mm and the wall thickness of 3mm, the height of the limiting cylinder is matched with that of a sample, and the lower end of the limiting cylinder is fixedly connected to the cutting turntable; the top cover of the limiting cylinder is a round cake with the diameter of 40.1mm and the thickness of 3mm, and a hole with the diameter of 4mm is arranged at the center; the limiting disc is a round cake with the diameter of 40mm and the thickness of 3mm, and steel nails with the spacing of 10mm are uniformly distributed on the lower surface of the limiting disc; the limiting rod is a cylindrical long rod with the diameter of 3.5mm, the lower end of the limiting rod is fixedly connected to the center of the upper surface of the limiting disc, and the upper end of the limiting rod passes through a hole in the center of the upper top cover of the limiting cylinder.
After cutting, taking out the cut sample through a sample bearing mechanism, wherein the sample bearing mechanism comprises an arc-shaped grabbing piece, a handle and a connecting screw; the arc-shaped grabbing pieces are two same semi-cylinders with the inner diameter of 39.5mm and the thickness of 2 mm; handles are symmetrically arranged on two sides of the arc-shaped grasping piece, the handles are L-shaped members, a hole with threads is formed in the center of the long side, the number of the handles is two, and one end of the short side is symmetrically and fixedly connected to the side face of the arc-shaped grasping piece; the diameter of the connecting screw is matched with the hole in the center of the long edge of the handle, and the two handles are connected through the connecting screw.
A lifting undisturbed soil triaxial sample preparation process is characterized by comprising the following steps:
(1) determining the cutting rotating speed:
judging the hardness of the soil according to the liquidity index of undisturbed soil needing to be cut, and determining the cutting rotating speed according to the soil hardness:
(2) preparing an instrument:
horizontally placing the sample preparation device on a flat platform, observing leveling bubbles, adjusting a leveling nut to enable the instrument to be in a horizontal state, placing a sample bearing mechanism on one side of the instrument, and taking out a sample after cutting is completed;
(3) fixing undisturbed soil:
placing undisturbed soil to be cut at the center of the nail disc, and moving the limiting rod downwards until the lower surface of the limiting disc is in contact with the placed undisturbed soil;
(4) cutting a soil sample:
starting a rotating speed switch: adjusting a rotating speed switch to a corresponding gear according to the cutting rotating speed determined in the step (1), and enabling a cutting turntable to start working to drive a cutting blade to rotate;
secondly, starting a lifting control switch and a speed control switch: the lifting control switch and the speed control switch are both adjusted to upper gears, the warning lamp starts to work and is bright green, and the hydraulic lifting platform starts to quickly rise;
regulating a speed control switch: when the lifting height of the hydraulic lifting platform exceeds 40mm, the warning lamp is bright red, the top of the undisturbed soil to be cut is about to contact with the cutting blade, the speed control switch is adjusted to a lower gear, and the hydraulic lifting platform slowly ascends;
cutting is suspended: when one third of undisturbed soil is cut, firstly adjusting a lifting control switch to a middle gear, extinguishing a warning lamp, stopping lifting a hydraulic lifting platform, then adjusting a rotating speed switch to the middle gear, stopping working of a rotating chain and stopping rotation of a cutting blade;
cutting residual soil body: cutting the residual soil body which is already cut but is connected to the uncut part by using a wire saw;
sixthly, continuously cutting: adjusting a rotating speed switch to a lower gear, starting the cutting turntable to work, slowly rotating a cutting blade, adjusting a lifting control switch to an upper gear, continuously and slowly lifting a hydraulic lifting platform, and continuously cutting a soil sample at the contact position of the soil sample and the cutting blade;
and (c) repeating the operation: repeating the fourth step, the fifth step and the sixth step for two times when the undisturbed soil is cut by one third;
stopping cutting: when the undisturbed soil is completely cut, firstly adjusting the lifting control switch to a middle gear, extinguishing the warning lamp, stopping lifting the hydraulic lifting platform, then adjusting the rotating speed switch to the middle gear, stopping working of the rotating chain and stopping rotation of the cutting blade;
(5) and resetting the hydraulic lifting platform:
firstly, adjusting a speed control switch to an upper gear, then adjusting a lifting control switch to a lower gear, starting the work of a warning lamp, and quickly descending a hydraulic lifting platform; when the hydraulic lifting platform is lowered to the initial position, the lifting control switch is adjusted to the middle gear, the warning lamp is turned off, and the hydraulic lifting platform stops lifting; meanwhile, the speed control switch is modulated to a middle gear;
(6) taking out a soil sample:
the upper cover of the limiting cylinder is taken down, the limiting rod is pulled out, the limiting disc is separated from the top of the cut soil sample, the cut soil sample is wrapped by the arc-shaped grabbing piece, the handle is folded and pulled upwards, the cut soil sample is pulled out from the nail disc, the taken soil sample is processed, the redundant part is cut away, only the height of 80mm is reserved, the manufacturing of an original soil sample is completed, and the cut original soil sample is placed in a maintenance box to be used.
The invention has the beneficial effects that:
the sample preparation process can select different cutting rotating speeds aiming at the soils with different hardness, thereby reducing the phenomena of uneven cutting or cutting crack and the like generated in the mechanical cutting process. The leveling air bubbles and the leveling nuts arranged on the instrument can ensure that the whole cutting process works on the horizontal plane, and the soil body is prevented from generating inclined deformation. The warning light reminds the operator to observe the cutting process at the critical moment, so that the influence of uncertain factors is reduced. Limiting mechanism has ensured that in the cutting process, the soil sample rises or descends in vertical direction all the time, and the equal atress in position about the soil sample can not produce and control the rocking, reduces the disturbance to the soil sample in the cutting process. The combination of the hydraulic lifting platform and the cutting turntable is that manual sample preparation is converted into mechanical sample preparation, manpower is liberated, meanwhile, nearly one time of soil cutting operation can be reduced on the basis of the operation steps of the original soil cutting device, sample preparation failure caused by human factors is avoided, and sample preparation success rate and speed are greatly improved. The annular cutting blade cuts the soil body by rotating, so that the cutting efficiency is accelerated, the huge disturbance to the undisturbed soil caused by continuous rotation of the soil body in the soil cutting process of the existing soil cutter is avoided, and the success rate of sample preparation is improved. The sample bearing mechanism solves the problem that the sample is difficult to take out after the soil sample is manufactured or the undisturbed soil is greatly disturbed in the taking-out process, the sample bearing mechanism is in contact with the cut sample through a hollow drum, then handles of the sample bearing mechanism are mutually compressed, so that the sample to be taken is fixed, and finally the sample is upwards pulled out. The invention greatly simplifies the operation steps, does not disturb the undisturbed soil in the cutting process, avoids the influence of uncertain factors and human factors in the soil cutting process, and accurately and efficiently finishes sample preparation. Compared with the existing undisturbed soil cutter in a laboratory, the sample preparation efficiency of the soil cutter is improved by about 2.5 times, and the sample preparation time is about 10 minutes.
The invention is further described with reference to the following figures and specific examples.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural view of the support mechanism of the present invention.
Fig. 3 is a schematic structural view of the lifting mechanism of the present invention.
Fig. 4 is a schematic view of the structure of the cutting mechanism of the present invention.
Fig. 5 is a schematic structural view of the limiting mechanism of the present invention.
FIG. 6 is a schematic structural diagram of the sample holding mechanism of the present invention.
Fig. 7 is a schematic view of the invention in preparation for cutting.
Fig. 8 is a schematic illustration of the cutting process of the present invention.
Fig. 9 is a schematic view of the invention after cutting is complete.
Reference numbers in the figures: 1, a supporting mechanism, 11 lower bases, 12 leveling nuts, 13 upper bases, 14 leveling air bubbles and 15 warning lamps; 2, a lifting mechanism, 21 a hydraulic lifting platform, 22 a hydraulic lifting column, 23 a lifting control switch, 24 a speed control switch and 25 a nail plate; 3, a cutting mechanism, 31 a left fixed steel frame, 32 a right fixed steel frame, 33 a control room, 34 a rotating speed switch, 35 a rotating shaft, 36 a connecting gear, 37 a cutting turntable, 38 a rotating chain and 39 a cutting blade; 4, a limiting mechanism, 41 limiting cylinders, 42 limiting cylinder upper top covers, 43 limiting discs, 44 limiting rods and 45 steel nails; 5 hold appearance mechanism, 51 arc grab blade, 52 handles, 53 linking screw, 6 wait to cut undisturbed soil, 7 samples.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Referring to fig. 1-9, the sampler for preparing the three-axis sample of the lifting undisturbed soil in the invention comprises a supporting mechanism 1, a lifting mechanism 2, a cutting mechanism 3, a limiting mechanism 4 and a sample bearing mechanism 5.
The supporting mechanism 1 comprises a lower base 11, a leveling nut 12, an upper base 13, a leveling bubble 14 and a warning light 15. The lower base 11 is located at the lowest face, the upper base 13 is arranged above the lower base 11, the leveling nut 12 is located between the lower base 11 and the upper base 13, the leveling bubble 14 is installed on the outer edge of the upper surface of the upper base 13, and the warning lamp 15 is installed on the right side of the leveling bubble 14.
The lower base 11 is a cylinder with the diameter of 320mm and the height of 55 mm.
The leveling nuts 12 are three in total, are uniformly distributed on the lower base 11 at equal intervals, and are leveled by rotating the leveling nuts.
The upper base 13 is a cylinder with the diameter of 220mm and the height of 35mm, and is connected with the lower base 11 through a leveling nut, and the center of the upper base 13 is aligned with the center of the lower base 11.
The leveling bubble 14 is provided with a center, and the relative position of the bubble and the center in the leveling bubble is observed to judge whether the instrument is level.
The warning light 15 has two colors of red and green, and helps to determine the lifting speed.
The lifting mechanism 2 comprises a hydraulic lifting platform 21, a hydraulic lifting column 22, a lifting control switch 23, a speed control switch 24 and a nail disc 25, wherein the hydraulic lifting platform 21 is connected with the upper base 13 through the hydraulic lifting column 22, the lifting control switch 23 and the speed control switch 24 are arranged on the front side surface of the hydraulic lifting platform 22 side by side, and the nail disc 25 is arranged on the upper surface of the hydraulic lifting platform 22.
The hydraulic lifting platform 21 is a round cake with the diameter of 120mm and the thickness of 20 mm.
The hydraulic lifting column 22 is a vertical telescopic cylinder, the lower end of the hydraulic lifting column is fixedly connected with the upper base 13, the upper end of the hydraulic lifting column is fixedly connected with the hydraulic lifting platform 21, and the centers of the hydraulic lifting column 22, the upper base 13 and the hydraulic lifting platform 21 are on the same straight line.
The lifting control switch 23 is arranged on the front side surface of the hydraulic lifting platform 22, controls the lifting of the hydraulic lifting column 22 and is divided into an upper gear, a middle gear and a lower gear; when the switch is positioned at the middle gear, the switch is in a closed state; when the switch is positioned at the upper gear, the switch is in a rising state; when the switch is positioned at a lower gear, the switch is in a descending state.
The speed control switch 24 and the lifting control switch 23 are arranged on the front side surface of the hydraulic lifting platform 22 side by side and are used for controlling the speed of the hydraulic lifting column 22; when the switch is positioned at the middle gear, the switch is in a closed state; when the switch is positioned at the upper gear, the switch is in a fast state; when the switch is positioned at a lower gear, the switch is in a slow speed state.
The nail plate 25 is a round cake with the diameter of 120mm and the thickness of 10mm, steel nails with the interval of 10mm are uniformly distributed on the upper surface, the nail plate 25 is fixedly connected to the upper surface of the hydraulic lifting platform 21, and the center of the nail plate is aligned to the center of the hydraulic lifting platform 21.
The cutting mechanism 3 comprises a left side fixed steel frame 31, a right side fixed steel frame 32, a control room 33, a rotating speed switch 34, a rotating shaft 35, a connecting gear 36, a cutting turntable 37 and a cutting blade 38; the left side fixed steel frame 31 and the right side fixed steel frame 32 are symmetrically and fixedly connected to the upper base 13, the control chamber 33 is fixed to the middle of the right side fixed steel frame 32, the rotating speed switch 34 is located on the front side surface of the control chamber 33, a rotating motor is arranged in the control chamber 33, the rotating shaft 35 is installed inside the right side fixed steel frame 32, one end of the rotating shaft 35 is connected with the rotating motor inside the control chamber 33, and the other end of the rotating shaft is connected with the connecting gear 36, so that the connecting gear 36 is driven to rotate, the connecting gear 36 is connected with a rotating chain 38 inside the cutting turntable 37, the cutting blade 39 is fixedly connected to the rotating chain 38, and when the rotating chain 38 rotates.
The fixed steelframe 31 in left side be a cylindrical solid steel column, diameter 10mm, highly match with the sample height, the bottom rigid coupling is on last base 13. The right side fixed steel frame 32 is a cylindrical hollow steel column with an inner diameter of 8mm and a wall thickness of 2mm, the height of the right side fixed steel frame is consistent with that of the left side fixed steel frame 31, and the bottom end of the right side fixed steel frame is fixedly connected to the upper base 13.
The control room 33 is fixedly connected with the middle part of the right fixed steel frame 32, and a power supply, a circuit and a rotating motor are arranged in the control room.
The rotating speed switch 34 is located on the front side of the control chamber 33 and is divided into an upper gear, a middle gear and a lower gear. When the switch is positioned at the middle gear, the switch is in a closed state; when the switch is positioned at the upper gear, the switch is in a fast state; when the switch is positioned at a lower gear, the switch is in a slow speed state.
The rotating shaft 35 is a rotatable cylinder, is located inside the right side fixed steel frame 32, has a diameter matched with that of the right side fixed steel frame 32, and has a lower end connected with a rotating motor inside the control room 33.
The connecting gear 36 is a gear with a thickness of 5mm and is fixedly connected to the upper end of the rotating shaft 35.
The cutting turntable 37 is a circular ring structure, and a chain track is arranged in the cutting turntable.
The rotating chain 38 is a circular ring chain, is placed on a chain track inside the cutting turntable 37, is connected with the connecting gear 36, and drives the rotating chain 38 to rotate when the connecting gear 36 rotates.
The cutting blade 39 is an annular blade which is surrounded by 12 long and thin needle-shaped steel nails, the diameter of the upper end of the annular blade is 80mm, the diameter of the lower end of the annular blade is 39.1mm, the annular blade is fixedly connected to a rotating chain 38 in the cutting turntable 37 at equal intervals, and when the rotating chain rotates, the cutting blade 39 is driven to rotate.
The limiting mechanism 4 comprises a limiting cylinder 41, an upper top cover 42 of the limiting cylinder, a limiting disc 43 and a limiting rod 44; the limiting cylinder 41 is fixedly connected right above the cutting turntable 37, the upper top cover 42 of the limiting cylinder is arranged on the upper top surface of the limiting cylinder 41, the limiting disc 43 is arranged inside the limiting cylinder 41, one end of the limiting rod 44 is fixedly connected to the upper surface of the limiting disc 43, and the other end of the limiting rod passes through a hole in the center of the upper top cover 42 of the limiting cylinder.
The limiting cylinder 41 is a hollow cylinder with an inner diameter of 40.1mm and a wall thickness of 3mm, the height of the hollow cylinder is matched with the height of a sample, and the lower end of the hollow cylinder is fixedly connected to the cutting turntable 37.
The upper top cover 42 of the limiting cylinder is a round cake with the diameter of 40.1mm and the thickness of 3mm, and a hole with the diameter of 4mm is arranged at the center.
The limiting disc 43 is a round cake with the diameter of 40mm and the thickness of 3mm, and steel nails 45 with the distance of 10mm are uniformly distributed on the lower surface.
The limiting rod 44 is a cylindrical long rod with the diameter of 3.5mm, the lower end of the limiting rod is fixedly connected to the center of the upper surface of the limiting disc 43, and the upper end of the limiting rod passes through a hole in the center of the upper top cover 42 of the limiting cylinder.
The sample bearing mechanism 5 comprises an arc-shaped grasping piece 51, a handle 52 and a connecting screw 53; handles 52 are symmetrically arranged on two sides of the arc-shaped grasping piece 51, and the middle parts of the handles 52 are connected through connecting screws 53.
The arc-shaped grabbing pieces 51 are two identical semi-cylinders with the inner diameter of 39.5mm and the thickness of 2 mm.
The handle 52 is an L-shaped component, the center of the long side is provided with a threaded hole, the number of the handles 52 is two, and one end of the short side is symmetrically and fixedly connected with the side surface of the arc-shaped grabbing piece 51.
The diameter of the connecting screw 53 is matched with the hole at the center of the long side of the handle 52, and the two handles 52 are connected through the connecting screw 53.
The invention relates to a lifting undisturbed soil triaxial sample preparation process, which comprises the following steps:
1. determining the cutting rotating speed:
and judging the hardness of the soil according to the liquidity index of the undisturbed soil needing to be cut. In this embodiment, the undisturbed soil to be cut is hard clay in the south of Henan, and the natural water content is detected to be 2.019%, the liquid limit is 1.267%, and the plastic limit is 0.632. The cutting fluid is obtained by substituting into a fluid index calculation formula, the fluid index is 0.249 & gt 0, so the cutting fluid belongs to soft soil, and the cutting rotating speed adopts a slow gear.
2. Preparing an instrument:
the instrument is placed flat on a flat platform, the leveling bubble 14 is observed, and the leveling nut 12 is adjusted to enable the instrument to be in a horizontal state. And placing the sample bearing mechanism 5 at one side of the instrument, and taking out the sample after the cutting is finished.
3. Fixing undisturbed soil:
4. Cutting a soil sample:
the rotation speed switch 34 is activated. As can be seen, the rotation speed switch 34 is shifted to the lower gear position by slow cutting. The cutting turntable 37 is put into operation and the cutting blades 38 are brought into rotation at a low speed.
② the lifting control switch 23 and the speed control switch 24 are started. The lifting control switch 23 and the speed control switch 24 are both adjusted to the upper gear, the warning lamp starts to work, the color is bright green, and the hydraulic lifting platform 21 starts to rise rapidly.
And regulating the speed control switch 24. When the lifting height of the hydraulic lifting platform 21 exceeds 40mm, the warning lamp is red, the top of the undisturbed soil to be cut is about to contact the cutting blade 39, the speed control switch 24 is adjusted to the lower gear, and the hydraulic lifting platform 21 is slowly lifted.
And fourthly, stopping cutting. When one third of the undisturbed soil is cut, the lifting control switch 23 is adjusted to the middle gear, the warning lamp 15 is turned off, the hydraulic lifting platform 21 stops lifting, the rotating speed switch 34 is adjusted to the middle gear, the rotating chain 38 stops working, and the cutting blade 39 does not rotate any more.
Cutting residual soil body. The residual soil body which has been cut but has not yet been cut is cut with a wire saw.
Sixthly, continuing cutting. The speed switch 34 is shifted to the lower position, the cutting dial 37 is operated and the cutting blade 39 is rotated at a slow speed. The elevation control switch 23 is shifted to the upper position, the hydraulic elevation table 21 continues to ascend slowly, and the soil sample continues to be cut at the contact position of the soil sample and the cutting blade 39.
And seventhly, repeating the operation. Repeating the four steps, the five steps and the sixteenth step for two times when the undisturbed soil is cut by one third.
And stopping cutting. When the undisturbed soil is completely cut, the lifting control switch 23 is adjusted to the middle gear, the warning lamp 15 is turned off, the hydraulic lifting platform 21 stops lifting, the rotating speed switch 34 is adjusted to the middle gear, the rotating chain 38 stops working, and the cutting blade 39 does not rotate any more.
5. Resetting the hydraulic lifting platform 21:
the speed control switch 24 is adjusted to the upper gear, the lifting control switch 23 is adjusted to the lower gear, the warning lamp 15 starts to work, and the hydraulic lifting platform 21 starts to descend rapidly. When the hydraulic lifting platform 21 is lowered to the initial position, the lifting control switch 23 is adjusted to the middle gear, the warning lamp 15 is turned off, and the hydraulic lifting platform stops lifting. At the same time, the speed control switch 24 is modulated to the intermediate gear.
6. Taking out a soil sample:
and taking down the upper cover 42 of the limiting cylinder, and pulling out the limiting rod 44 to separate the limiting disc 43 from the top of the cut soil sample. The cut soil sample is wrapped by the arc-shaped grasping piece 51, the handle 52 is folded and pulled upwards, the cut soil sample is pulled out from the nail disc 25, the taken soil sample is processed, the redundant part is cut off, the height of 80mm is reserved, namely, the preparation of an undisturbed soil sample 7 is completed, and the cut undisturbed soil sample is placed in a curing box to be used.
The above description is provided for the purpose of describing the preferred embodiments of the present invention in more detail, and it should not be construed that the embodiments of the present invention are limited to the description above, and it will be apparent to those skilled in the art that the present invention can be implemented in many different forms without departing from the spirit and scope of the present invention.
Claims (6)
1. A lifting undisturbed soil triaxial sample preparation process is characterized by comprising the following steps: firstly, judging the hardness of a soil sample according to the characteristics of the soil sample, and determining the cutting rotating speed of a cutting mechanism; then, placing the soil sample on a lifting mechanism, wherein the soil sample can rise under the driving of the lifting mechanism, and cutting the gradually rising soil sample by the rotation of an annular cutting blade of a cutting mechanism to finish the primary manufacture of a triaxial sample; finally, the height of the lifting mechanism is reduced, the sample is taken out and is processed according to the required height, and the preparation of the sample is completed;
the lifting mechanism comprises a hydraulic lifting platform, a hydraulic lifting column, a lifting control switch and a speed control switch, wherein the hydraulic lifting platform is used for bearing a soil sample, and performs up-and-down lifting motion along with the hydraulic lifting column;
the hydraulic lifting platform is a round cake with the diameter of 120mm and the thickness of 20 mm; the hydraulic lifting column is a vertical telescopic cylinder, and the hydraulic lifting column and the center of the hydraulic lifting platform are on the same straight line; the nail plate is fixedly connected to the upper surface of the hydraulic lifting table, the center of the nail plate is aligned with the center of the hydraulic lifting table, the nail plate is a round cake with the diameter of 120mm and the thickness of 10mm, and steel nails with the interval of 10mm are uniformly distributed on the upper surface of the nail plate and used for bearing a soil sample;
the cutting mechanism comprises an annular cutting blade, the cutting blade is fixedly connected to a rotating chain in the cutting turntable, a connecting gear is connected with the rotating chain, and a rotating motor is connected with the connecting gear through a rotating shaft;
the cutting blade is an annular blade which is formed by surrounding 12 long and thin needle-shaped steel nails, the diameter of the upper end of the annular blade is 80mm, the diameter of the lower end of the annular blade is 39.1mm, the annular blade is fixedly connected to a rotating chain in the cutting turntable at equal intervals, and the rotating chain is driven to rotate through a rotating motor so as to drive the cutting blade to rotate.
2. The lifting undisturbed soil triaxial sample preparation process according to claim 1, wherein the process comprises the following steps: the lifting control switch controls the lifting of the hydraulic lifting column and is divided into an upper gear, a middle gear and a lower gear; when the switch is positioned at the middle gear, the switch is in a closed state; when the switch is positioned at the upper gear, the switch is in a rising state; when the switch is positioned at a lower gear, the switch is in a descending state; the speed control switch is used for controlling the speed of the hydraulic lifting column; the switch is in a closed state when positioned in the middle gear; when the switch is positioned at the upper gear, the switch is in a fast state; when the switch is positioned at a lower gear, the switch is in a slow speed state.
3. The lifting undisturbed soil triaxial sample preparation process according to claim 1, wherein the process comprises the following steps: a limiting mechanism is arranged above the cutting mechanism and used for positioning when the soil sample is cut, and the limiting mechanism comprises a limiting cylinder; the limiting cylinder is fixedly connected right above the cutting mechanism, the top cover on the limiting cylinder is arranged on the top surface of the limiting cylinder, the limiting disc is arranged inside the limiting cylinder, one end of the limiting rod is fixedly connected to the upper surface of the limiting disc, and the other end of the limiting rod passes through the hole in the center of the top cover on the limiting cylinder.
4. The lifting undisturbed soil triaxial sample preparation process according to claim 3, wherein the process comprises the following steps: the limiting cylinder is a hollow cylinder with the inner diameter of 40.1mm and the wall thickness of 3mm, the height of the limiting cylinder is matched with that of a sample, and the lower end of the limiting cylinder is fixedly connected to the cutting turntable; the top cover of the limiting cylinder is a round cake with the diameter of 40.1mm and the thickness of 3mm, and a hole with the diameter of 4mm is arranged at the center; the limiting disc is a round cake with the diameter of 40mm and the thickness of 3mm, and steel nails with the spacing of 10mm are uniformly distributed on the lower surface of the limiting disc; the limiting rod is a cylindrical long rod with the diameter of 3.5mm, the lower end of the limiting rod is fixedly connected to the center of the upper surface of the limiting disc, and the upper end of the limiting rod passes through a hole in the center of the upper top cover of the limiting cylinder.
5. The lifting undisturbed soil triaxial sample preparation process according to claim 1, wherein the process comprises the following steps: after cutting, taking out the cut sample through a sample bearing mechanism, wherein the sample bearing mechanism comprises an arc-shaped grabbing piece, a handle and a connecting screw; the arc-shaped grabbing pieces are two same semi-cylinders with the inner diameter of 39.5mm and the thickness of 2 mm; handles are symmetrically arranged on two sides of the arc-shaped grasping piece, the handles are L-shaped members, a hole with threads is formed in the center of the long side, the number of the handles is two, and one end of the short side is symmetrically and fixedly connected to the side face of the arc-shaped grasping piece; the diameter of the connecting screw is matched with the hole in the center of the long edge of the handle, and the two handles are connected through the connecting screw.
6. A lifting undisturbed soil triaxial sample preparation process is characterized by comprising the following steps:
(1) determining the cutting rotating speed:
judging the hardness of the soil according to the liquidity index of undisturbed soil needing to be cut, and determining the cutting rotating speed according to the soil hardness:
(2) preparing an instrument:
horizontally placing the sample preparation device on a flat platform, observing leveling bubbles, adjusting a leveling nut to enable the instrument to be in a horizontal state, placing a sample bearing mechanism on one side of the instrument, and taking out a sample after cutting is completed;
(3) fixing undisturbed soil:
placing undisturbed soil to be cut at the center of the nail disc, and moving the limiting rod downwards until the lower surface of the limiting disc is in contact with the placed undisturbed soil;
(4) cutting a soil sample:
(5) and resetting the hydraulic lifting platform:
firstly, adjusting a speed control switch to an upper gear, then adjusting a lifting control switch to a lower gear, starting the work of a warning lamp, and quickly descending a hydraulic lifting platform; when the hydraulic lifting platform is lowered to the initial position, the lifting control switch is adjusted to the middle gear, the warning lamp is turned off, and the hydraulic lifting platform stops lifting; meanwhile, the speed control switch is modulated to a middle gear;
(6) taking out a soil sample:
the upper cover of the limiting cylinder is taken down, the limiting rod is pulled out, the limiting disc is separated from the top of the cut soil sample, the cut soil sample is wrapped by the arc-shaped grabbing piece, the handle is folded and pulled upwards, the cut soil sample is pulled out from the nail disc, the taken soil sample is processed, the redundant part is cut away, only the height of 80mm is reserved, the manufacturing of an original soil sample is completed, and the cut original soil sample is placed in a maintenance box to be used.
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| KR100356283B1 (en) * | 2000-05-16 | 2002-10-18 | 한국건설기술연구원 | omnipotent sampler be able to gather undistruded a sample |
| DE102006010158B3 (en) * | 2006-02-27 | 2007-07-19 | Umwelt-Geräte-Technik GmbH | Soil monolith removing device for lysimeter jar, has separating device with separating rope, which is guided at inner wall of jar for separating monolith, where another separating device separates slices of preset thickness from monolith |
| CN2935121Y (en) * | 2006-04-27 | 2007-08-15 | 中国科学院武汉岩土力学研究所 | Geotechnical triaxial test sample-cutting device |
| CN102768130B (en) * | 2012-08-03 | 2014-07-02 | 中国科学院遗传与发育生物学研究所农业资源研究中心 | Device and method for collecting undisturbed soil sample |
| CN103558054B (en) * | 2013-11-17 | 2016-03-23 | 吉林大学 | Full-automatic rotating thin wall-type soil-cutter |
| CN203745255U (en) * | 2014-01-16 | 2014-07-30 | 昆明理工大学 | Sample cutter for preparing sample of soft soil triaxial test |
| CN204514682U (en) * | 2015-03-31 | 2015-07-29 | 西安科技大学 | A kind of triaxial compression test original state soil body sample preparation device |
| CN204556351U (en) * | 2015-04-03 | 2015-08-12 | 西安科技大学 | A kind of triaxial compression test undisturbed sample preparation facilities |
| CN104890129B (en) * | 2015-07-03 | 2016-07-20 | 合肥工业大学 | The automatic soil-cutter of Multifunctional adjustable |
| CN205483735U (en) * | 2016-03-14 | 2016-08-17 | 三峡大学 | But variable diameter reduces full -automatic surely native ware of remolding disturbance of clay sample |
| CN206192722U (en) * | 2016-09-30 | 2017-05-24 | 山西省交通科学研究院 | Quick preparation facilities of initial soil sample of original state triaxial |
| CN106596219B (en) * | 2016-11-30 | 2019-06-11 | 同济大学 | A kind of electronic triaxial test soil sample cuts earthenware |
| CN107328621B (en) * | 2017-06-30 | 2019-10-25 | 中交天津港湾工程研究院有限公司 | A kind of soil test cuts sample device and its application method with full-automatic gas pressure type |
| CN107367414B (en) * | 2017-07-26 | 2023-06-02 | 中原工学院 | Hard clay undisturbed triaxial sample preparation device and application method thereof |
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