CN111426506A - Push-in type in-situ soil sampler - Google Patents
Push-in type in-situ soil sampler Download PDFInfo
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- CN111426506A CN111426506A CN202010244849.9A CN202010244849A CN111426506A CN 111426506 A CN111426506 A CN 111426506A CN 202010244849 A CN202010244849 A CN 202010244849A CN 111426506 A CN111426506 A CN 111426506A
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/04—Devices for withdrawing samples in the solid state, e.g. by cutting
- G01N1/08—Devices for withdrawing samples in the solid state, e.g. by cutting involving an extracting tool, e.g. core bit
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Abstract
The invention discloses a push-in type in-situ soil sampler, which comprises: a cutting mechanism which moves downwards along a longitudinal axis to cut into the soil sample and limits a soil sample collecting chamber (S1) on a radius perpendicular to the longitudinal axis, wherein the soil sample entering the soil sample collecting chamber (S1) is coated on the outer circumferential surface by the gel solution to maintain the in-situ characteristic; and a holding mechanism for (i) storing the gel solution, (ii) outputting the gel solution to the soil sample collection chamber (S1) by pressing, and (iii) cutting the soil sample in a radial direction perpendicular to the longitudinal axis and holding the soil sample in the soil sample collection chamber (S1). The invention is suitable for trapping deep sandy soil samples and keeps the in-situ characteristics of the deep sandy soil samples, and in the sampling process, the soil samples obtained by cutting the cutting boot blade tips are wrapped by the gel solution, so that the friction and disturbance of the soil samples when entering the connecting inner cylinder and the connecting inner cylinder are reduced; when soil sampling is completed, the soil sample is sealed by the cut-off tool, so that the phenomenon that the soil sample falls off in the lifting process to damage the in-situ characteristic of the soil sample and even cause soil sampling failure is avoided.
Description
Technical Field
The invention relates to the field of engineering geological drilling, in particular to a push-in type in-situ soil sampler.
Background
In engineering geological exploration and reconnaissance work, in order to obtain physical and mechanical indexes of foundation soil, in addition to in-situ testing, a means of performing indoor geotechnical experiments after drilling and sampling is mainly adopted at present. The soil sampler is a tool for collecting a soil sample of an engineering field, the obtained soil sample is transported back to a laboratory, and the basic physical and mechanical parameters of the field, including density, porosity ratio, water content, specific gravity, internal friction angle, cohesive force, consolidation coefficient, unconfined compressive strength and the like, are measured through an indoor test, so that parameters are provided for subsequent engineering design. The sampling quality of the soil sampler directly determines whether the basic physical mechanical parameters are accurate or not, if the sampling quality is poor, the measured basic physical mechanical parameters are inaccurate, so that the design is over conservative, the construction cost is increased, or the design is in danger and engineering accidents are easily caused, and therefore, the high-quality soil sample is very necessary to obtain.
In the engineering geological survey, mainly meet fine clay or sand, the geotome on the present market is excellent in the aspect of fine clay sample, can obtain high-quality soil sample, but in the aspect of the sand sample, hardly obtain high-quality sand sample, the leading reason is as follows:
① the method is characterized in that the sand sample volume is compressed or expanded in the sampling process to cause the change of the relative compactness of the sand sample and the structural damage, which are caused by high friction between the sand sample and the inner pipe wall or the relaxation of the soil sample caused by the diameter of the sampling pipe being larger than that of the cutting-in shoe, the recovery of ② effective stress and the related change further cause the deformation of the soil sample, and the ③ sand sample is easy to fall off when being taken out from a drill hole to cause the defect of the soil sample.
For example, patent document CN101140201A discloses a hydraulic thin-wall geotome. The soil sampler is characterized in that the lower end of a hollow drill rod is connected with a liquid distribution head, the liquid distribution head is connected with a piston rod and an outer cylinder, a movable piston is hermetically sleeved on the piston rod in a sliding mode and is hermetically matched with the inner wall of the outer cylinder in a sliding mode, the movable piston is connected with a soil sample cylinder, and the lower end of the piston rod is connected with a fixed piston. When the water pressure is communicated to the movable piston from the drill rod, the movable piston is pressed down to force the soil sample cylinder to be pressed into the soil. The fixed piston can not move, the fixed piston relatively rises when the soil sample cylinder is pressed down to cause sealing, so that the soil sample can not fall off, and the outer cylinder body and the soil sample cylinder are lifted together when the soil sample cylinder is pulled up. The soil sampler can generate overlarge friction force between a sand sample and the inner pipe wall in the penetrating process to cause sand sample disturbance and structural damage, and when the soil sampler is pulled out after sampling is finished, the sand sample is easy to fall off due to the fact that the sand does not have cohesive force and the soil sampling pipe does not have a sealing measure, so that the sand sample is damaged.
Disclosure of Invention
In order to solve the problems in the background art, the invention discloses a push-in type in-situ soil sampler which is suitable for trapping deep sandy soil samples and keeping the in-situ characteristics of the deep sandy soil samples, and can simultaneously solve the problems that the friction between the sand samples and the inner wall of a sampling pipe is overlarge during sampling, the relative compactness of the sand is changed during sampling, the structure is damaged, the sand is easy to fall off when the soil sampler is taken out after sampling is completed, and the defects are caused. Specifically, the friction between the sand sample and the inner wall of the sampling pipe is greatly reduced by covering the gel solution on the sand sample during sampling, and the cutting knife seals the sand sample to avoid falling off in the extraction process when the sampling is completed, so that the disturbance of the sand sample in the sampling process can be greatly reduced, and the natural structure and the relative compactness of the sand soil are kept as much as possible.
The technical scheme adopted by the invention is as follows:
a push-in-situ soil sampler for taking a soil sample and maintaining its in-situ characteristics, comprising: the cutting mechanism moves downwards along a longitudinal axis to cut into the soil sample, a soil sample collecting chamber is limited and formed on a radius perpendicular to the longitudinal axis, and the soil sample entering the soil sample collecting chamber is coated on the outer peripheral surface by the gel solution to keep the in-situ characteristic of the soil sample; and a holding mechanism for (i) storing the gel solution, (ii) outputting the gel solution into the soil sample collection chamber by pressing, and (iii) cutting the soil sample in a radial direction perpendicular to the longitudinal axis and holding the soil sample in the soil sample collection chamber, the outputting of the gel solution being performed while the cut soil sample is being cut, the cutting being performed at or after the cut soil sample is terminated.
Specifically, the cutting mechanism is moved downward by a driving force of a cutting drive unit including a connection outer cylinder and a cutting shoe fixedly connected to the connection outer cylinder, the cutting drive unit including a first hydraulic chamber and a first piston driven to move downward by a hydraulic pressure in the first hydraulic chamber, the connection outer cylinder being fixedly connected to the first piston, and a hydraulic pressure is transmitted to the cutting shoe to cut into the soil sample in a longitudinal direction and enter the soil sample trapping chamber during a volume increase of the first hydraulic chamber.
Specifically, the holding mechanism comprises a gel storage chamber, a second hydraulic chamber and a cutting component, wherein the gel storage chamber is communicated with the soil sample trapping chamber, and the liquid gel is extruded into the soil sample trapping chamber to form the gel coating layer in the process of compressing the gel storage chamber; wherein the cutting assembly comprises a cutting knife, a connecting inner cylinder and a second piston driven by hydraulic pressure in a second hydraulic chamber to move downwards, the connecting inner cylinder fixedly connects the cutting knife to the second piston, and during the increase of the volume of the second hydraulic chamber, the liquid pressure is transmitted to the cutting knife to cut off the soil sample in the radius direction and enable the soil sample to be retained in the soil sample collecting chamber.
Specifically, the cutting blade is provided with at least two cutting blades extending in the longitudinal axis direction, and the cutting shoe is provided with a cutting guide portion for guiding the cutting blades to bend inward when the cutting blade moves downward.
According to the invention, clean water is pumped into the hollow drill rod through the water pump, and flows into a cavity formed by the inner wall of the inner cylinder, the outer wall of the gel overflow pipe and the fixed plug and a cavity formed by the inner wall of the outer cylinder, the outer wall of the inner cylinder and the upper end face of the first piston respectively after passing through the catcher head, and hydraulic pressure is generated on the first piston to push the first piston to move downwards. And a cavity formed by the lower end face of the second piston, the outer wall of the inner cylinder, the inner wall of the connecting inner cylinder and the upper end face of the fixed plug is filled with gel solution, the fixed plug fixes the relative position of the fixed plug and the catcher head through the inner cylinder, hydraulic pressure acting on the first piston pushes the connecting outer cylinder and the connecting inner cylinder, and the volume between the first piston and the fixed plug is reduced to force a part of polymer gel to flow through gel flow holes distributed along the circumference at the top of the connecting inner cylinder and flow downwards along an annular gap between the connecting inner cylinder and the connecting outer cylinder. The gel that flows to the inner wall of the lower cutting shoe passes through the gap between the cutting blades and wraps around the outer surface of the catcher where the soil sample is taken. The remaining gel solution enters the gel overflow hole of the fixed plug, flows up the gel overflow pipe of the trap and is discharged into the drilled hole through the gel discharge hole.
Further, during the enlargement of the first hydraulic chamber, the first piston abuts against the second piston and pushes the second piston to move downwards along with the second piston, and the gel storage chamber is compressed and reduced; during the enlargement of the second hydraulic chamber, the second piston is driven downwards and the first piston remains stationary.
Furthermore, the first hydraulic chamber is formed by enclosing a liquid distribution head, an outer cylinder, an inner cylinder and a first piston, the first piston is positioned below the liquid distribution head, a first branch and a second branch are arranged in the liquid distribution head, and the first hydraulic chamber is communicated with the first branch; the second hydraulic chamber is formed by a first piston, a second piston, a connecting outer cylinder and a guide cylinder body which are arranged in a surrounding mode, the guide cylinder body is slidably sleeved on the inner cylinder body, the upper end portion of the guide cylinder body is fixed on the first piston, the second piston is located below the first piston, the second hydraulic chamber is communicated with the second branch, and a valve assembly is arranged for opening or closing a liquid channel communicated between the second hydraulic chamber and the second branch; the gel storage chamber is formed by enclosing a fixed plug, an inner cylinder body, a second piston and a connecting inner cylinder together, and the fixed plug is arranged below the second piston and is fixedly connected with the bottom of the inner cylinder body.
Furthermore, the valve component comprises a liquid inlet valve hole and a movable valve core which is normally positioned at the position of the closed liquid inlet valve hole, the movable valve core can be arranged in the fixed plug in a vertically moving mode, a touch part is formed at the lower end part of the guide cylinder body, and at the position of the first piston close to the fixed plug, the touch part can abut against the movable valve core to enable the movable valve core to be separated from the position of the closed liquid inlet valve hole so as to open a liquid channel communicated with the second hydraulic chamber and the second branch.
Further, the middle cavity of the inner cylinder is configured to communicate with a second hydraulic chamber and a part of a liquid passage of the second branch, the liquid inlet valve hole penetrates through the side wall of the inner cylinder and communicates with the middle cavity thereof, and the second hydraulic chamber communicates with the liquid inlet valve hole via a drainage passage formed inside the first piston and the guide cylinder.
Further, the movable valve core is disposed in an inner concave hole in the fixed plug, and includes: a driven rod which drives the movable valve core to move downwards integrally under the action of the propping action force of the triggered part; the sealing cylinder is movably nested in the middle cavity of the inner cylinder body so as to seal the liquid inlet valve hole from the inner side; wherein, the driven rod is one or more; and a return spring which can apply force upwards to push the movable valve core to reset is arranged between the bottom of the movable valve core and the concave hole.
Further, a gel discharge hole is formed in the liquid dispensing head, and the gel storage chamber communicates with the gel discharge hole via a gel overflow hole and a gel overflow pipe to discharge surplus gel; wherein the gel overflow hole is formed on the fixed plug; the gel overflow pipe is sleeved in the inner cylinder, and a gap is formed between the gel overflow pipe and the inner cylinder to form a liquid channel communicated with the second hydraulic chamber and the second branch.
Furthermore, the soil sample collecting chamber is formed by enclosing a fixed plug and a connecting inner cylinder extending downwards, and the volume of the soil sample collecting chamber is gradually increased in the process that the connecting inner cylinder extends downwards.
Further, a gap is formed between the connecting outer cylinder and the connecting inner cylinder to form a gel extrusion channel for communicating the gel storage chamber and the soil sample collecting chamber; the upper part of the connecting inner cylinder is provided with an opening to communicate the gel extrusion channel and the gel storage chamber.
Further, a receiving recess for receiving a cutting blade is formed inside the cutting shoe, and the cutting blade is received in the receiving recess during downward movement of the first piston; and a soil sample collecting opening for allowing the soil sample to enter the soil sample collecting chamber is formed at the bottom of the cutting shoe, and the inner diameter of the cutting knife is slightly larger than that of the soil sample collecting opening in the state that the cutting knife is stored so as to form a glue injection gap for coating the soil sample with gel between the inner wall of the cutting knife and the outer wall of the collected soil sample.
Furthermore, the upper end part of the outer cylinder body is fixedly arranged on the outer side wall of the liquid distribution head, the upper end part of the inner cylinder body is fixedly arranged on the inner side wall of the liquid distribution head, and the first piston is arranged between the outer cylinder body and the inner cylinder body and is respectively connected with the outer cylinder body and the inner cylinder body in a sliding sealing manner; the upper end of the connecting outer cylinder is fixedly arranged on the outer side wall of the first piston, the upper end of the guide cylinder is fixedly arranged on the inner side wall of the first piston, and the second piston is arranged between the connecting outer cylinder and the guide cylinder and is respectively connected with the connecting outer cylinder and the guide cylinder in a sliding sealing manner.
In the invention, when the bottom surface of the guide cylinder body is contacted with the driven rods protruding from the upper surface of the fixed piston, the driven rods are pressed down, the guide cylinder body can move downwards, the liquid inlet valve hole on the inner cylinder body is opened, liquid flows into a cavity formed between the lower end surface of the first piston and the upper end surface of the second piston through the piston water inlet hole, hydraulic pressure acts on an interface between the two advancing pistons to force the second piston to generate downward acting pressure, the hydraulic pressure acting on the second piston pushes the connecting inner cylinder and the cutting knife to move downwards, the cutting blade of the cutting knife folds inwards along the chamfer angle of the inner surface of the cutting shoe, and a soil sample is fixed in the connecting inner cylinder, so that the effect of sealing the soil sample is achieved.
The catcher is made of stainless steel or brass and the like, and has certain strength and corrosion resistance, so that deformation and corrosion are prevented in the sampling process, and the connecting inner cylinder is made of a material (such as plastic and the like) with a small friction coefficient with soil, so that the friction effect between the inner wall of the connecting inner cylinder and a soil sample is reduced.
The gel solution is a polymer gel solution, particularly is Partially Hydrolyzed Polyacrylamide (PHP) polymer which is generally called PHP polymer, has good lubricating property, can be attached to the surface of a soil sample like lubricating oil to form a film with good lubricating property, and greatly reduces the friction force of the soil sample entering a connecting inner cylinder.
The invention has the beneficial effects that:
1) in the sampling process, the sandy soil cut by the cutting edge of the cutting shoe is wrapped by the gel solution, so that the friction of the sandy soil entering the connecting inner cylinder is greatly reduced, the root cause of soil sample disturbance is reduced, and the natural structure of the sandy soil is maintained as much as possible.
2) The gel solution is adopted to cover the outer surface of the sand sample, so that the water loss of the sand sample in the processes of transportation, storage and the like is avoided.
3) The cutting knife is adopted to seal the sandy soil, so that the sandy soil is prevented from falling off in the lifting process to cause the defect of the sand sample.
4) The whole acquisition device is in modular design, the standardized structure is low in cost, and the parts are screwed in the screw thread, so that the disassembly is simple and convenient.
5) Before soil sampling, the fixed plug is arranged at the bottom of the catcher and is flush with the cutting edge of the cutting boot, so that slurry in a drill hole can be completely prevented from entering the connecting inner cylinder, and the high sampling ratio of a soil sample is ensured.
6) When the water pressure is communicated to the first piston through the drill rod, the first piston is pressed down to drive the connecting outer cylinder and the connecting inner cylinder to be pressed into the soil. Different from a fixed soil sampler, the soil sampler does not need to be connected with a pull rod or pressed in or does not need to be transferred by a drill rod, so that the disturbance of the soil sample caused by the oblique force of the pressed and bent drill rod is avoided.
Drawings
Fig. 1 is a schematic sectional view of a push-in-situ geotome of the present invention.
Fig. 2(a) is a front sectional view of the fixing plug of the present invention.
Fig. 2(b) is a plan view of the fixing plug of the present invention.
Fig. 3 is a perspective view of the movable valve cartridge of the present invention.
Fig. 4 is a disassembled schematic view of the first piston, the second piston and the guide cylinder of the present invention.
Fig. 5 is a perspective view of the cutting blade of the present invention.
Fig. 6, 7 and 8 are schematic views of the working process of the push-in-situ soil sampler of the invention.
In the figure: 1, a drill rod joint; 2, a liquid dispensing head; 3, a first piston; 4, a second piston; 5, guiding the cylinder body; 6, an outer cylinder body; 7, connecting the outer cylinder; 8, connecting the inner cylinder; 9, an inner cylinder body; 10, a gel overflow pipe; 11, a cutting knife; 12, a connecting pipe; 13, cutting into the boot; 14, a fixed plug; 15, a movable valve core; 16, a return spring; 17, gel overflow hole; 18, a piston water inlet; 19, a water inlet passage; 20, a gel drainage hole; 21, gel flow wells; 22, a liquid inlet valve hole; 23, an O-shaped sealing ring groove; 24, an O-shaped sealing ring; 25, cutting off the blade; 26, a void; 27, driven rod.
Detailed Description
The following is a further description with reference to the drawings and examples. The following examples are intended to illustrate the invention only and are not intended to limit the scope of the invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
As shown in fig. 1, the push-in-situ geotome of the present invention comprises: the device comprises a drill rod joint 1 for hollow drill rod threaded connection, a liquid distribution head 2, an inner cylinder 9, a gel overflow pipe 10, an outer cylinder 6, a connecting outer cylinder 7, a connecting inner cylinder 8, a first piston 3, a second piston 4, a guide cylinder 5, a fixing plug 14, a cutting knife 11, a connecting pipe 12 and a cutting shoe 13. Wherein, the external thread of the lower end of the drill rod joint 1 is connected with the internal thread of the flange of the upper end of the liquid distribution head 2, the lower end of the liquid distribution head 2 is connected with the outer cylinder 6, the inner cylinder 9 and the gel overflow pipe 10 through threads, the first piston 3 is arranged between the inner cylinder 9 and the outer cylinder 6 in a sliding and sealing way, the external thread of the side wall of the lower end of the first piston 3 is connected with the internal thread of the upper end of the connecting outer cylinder 7, the internal thread of the lower concave hole of the first piston 3 is connected with the external thread of the upper end of the guide cylinder 5, the internal thread of the upper end of the cutting shoe 13 is connected with the external thread of the lower end of the connecting outer cylinder 7, the inner wall of the guide cylinder 5 is in a sliding and sealing way matched with the inner cylinder 9, the second piston 4 is arranged between the guide cylinder 5 and the connecting outer cylinder 7 in a sliding, the fixed plug 14 is connected with the lower end of the inner cylinder 9 and the lower end of the gel overflow pipe 10 through threads, the fixed plug 14 fixes the relative position of the fixed plug and the liquid distribution head 2 through the inner cylinder 9, and the periphery of the fixed plug 14 is in sealing sliding fit with the inner wall of the connecting inner cylinder 8.
The push-in-situ soil sampler is used for trapping deep sandy soil samples and keeping the in-situ characteristics of the deep sandy soil samples, and mainly comprises two parts, namely a cutting mechanism and a keeping mechanism from the overall structure. Wherein the cutting mechanism moves downwards along the longitudinal axis to cut into the soil sample and is limited on a radius perpendicular to the longitudinal axis to form a soil sample collecting chamber S1, and the soil sample entering the soil sample collecting chamber S1 is coated on the outer peripheral surface by the gel solution to keep the in-situ property; the retaining mechanism is used for (i) storing gel solution, (ii) outputting the gel solution to the soil sample collecting chamber S1 under the action of extrusion, and (iii) cutting the soil sample in the radial direction perpendicular to the longitudinal axis and retaining the soil sample in the soil sample collecting chamber S1, wherein the outputting of the gel solution is performed when the cut soil sample is cut, and the cutting is performed when the cut soil sample is finished or after the cut soil sample is finished. In the present embodiment, the radius defining the soil sample collection chamber S1 is a fixed radius, which is the inner diameter of the connecting inner cylinder 8, and the shape of the soil sample taken out is cylindrical, but in other embodiments, the radius may be a variable radius.
The cutting mechanism is moved downward by the driving force of the cutting drive unit including the connecting outer cylinder 7 and the cutting shoe 13 fixedly attached to the connecting outer cylinder 7, the cutting drive unit including the first hydraulic chamber Y1 and the first piston 3 driven to move downward by the hydraulic pressure in the first hydraulic chamber Y1, the connecting outer cylinder 7 being fixedly attached to the first piston 3, and the hydraulic pressure is transmitted to the cutting shoe 13 to cut the soil sample in the longitudinal direction and enter the soil sample trapping chamber S1 during the increase in the volume of the first hydraulic chamber Y1.
The retaining mechanism comprises a gel storage chamber S2, a second hydraulic chamber Y2 and a cutting component, wherein the gel storage chamber S2 is communicated with the soil sample trapping chamber S1, and the liquid gel is extruded into the soil sample trapping chamber S1 to form the gel coating layer in the process that the gel storage chamber S2 is compressed; wherein the cutting assembly comprises a cutting knife 11, a connecting inner cylinder 8 and a second piston 4 driven by hydraulic pressure in a second hydraulic chamber Y2 to move downwards, the connecting inner cylinder 8 fixedly connects the cutting knife 11 to the second piston 4, and during the volume increase of the second hydraulic chamber Y2, liquid pressure is transmitted to the cutting knife 11 to cut off the soil sample in the radial direction and make the soil sample retained in the soil sample trapping chamber S1.
The cutting blade 11 is provided with at least two cutting blades 25 extending in the longitudinal axis direction, and the cutting shoe 13 is provided with a cutting guide portion for guiding the cutting blades 25 to bend inward when the cutting blade 11 moves downward.
During the increase of the first hydraulic chamber Y1, the first piston 3 abuts against the second piston 4 and pushes the second piston 4 to move downwards synchronously therewith, and the gel storage chamber S2 is compressed and reduced; during the increase of the second hydraulic chamber Y2, the second piston 4 is driven to move down, and the first piston 3 is kept stationary.
The first hydraulic chamber Y1 is formed by enclosing a liquid distribution head 2, an outer cylinder 6, an inner cylinder 9 and a first piston 3, the first piston 3 is positioned below the liquid distribution head 2, a first branch and a second branch are arranged in the liquid distribution head 2, and the first hydraulic chamber Y1 is communicated with the first branch; the second hydraulic chamber Y2 is formed by a first piston 3, a second piston 4, a connecting outer cylinder 7 and a guide cylinder 5, the guide cylinder 5 is slidably sleeved on the inner cylinder 9, the upper end part of the guide cylinder is fixed on the first piston 3, the second piston 4 is positioned below the first piston 3, the second hydraulic chamber Y2 is communicated with the second branch, and a valve assembly is arranged for opening or closing a liquid channel communicated between the two; the gel storage chamber S2 is defined by the fixed plug 14, the inner cylinder 9, the second piston 4 and the connecting inner cylinder 8, and the fixed plug 14 is disposed below the second piston 4 and fixedly connected with the bottom of the inner cylinder 9.
The valve assembly comprises a liquid inlet valve hole 22 and a movable valve core 15 which is normally located at the position of the closed liquid inlet valve hole 22, the movable valve core 15 can be arranged in the fixed plug 14 in a vertically moving mode, a touch part is formed at the lower end part of the guide cylinder 5, and at the position of the first piston 3 close to the fixed plug 14, the touch part can abut against the position of the movable valve core 15 to enable the movable valve core 15 to be separated from the position of the closed liquid inlet valve hole 22 so as to open a liquid channel communicated with the second liquid pressure chamber Y2 and a second branch.
The central cavity of the inner cylinder 9 is configured to communicate with a second hydraulic chamber Y2 and a part of a liquid passage of the second branch, the inlet valve hole 22 penetrates through the side wall of the inner cylinder 9 and communicates with the central cavity thereof, and the second hydraulic chamber Y2 communicates with the inlet valve hole 22 via a drainage passage formed inside the first piston 3 and the guide cylinder 5.
The movable spool 15 is disposed in an internal recess in the fixed plug 14, and includes: a driven rod 27 which drives the movable valve core 15 to move downwards integrally by the propping acting force of the touched part; a sealing cylinder body movably nested in the middle cavity of the inner cylinder body 9 to seal the liquid inlet valve hole 22 from the inner side; wherein, the driven rod 27 is one or more; and a return spring 16 which can apply force upwards to push the movable valve core 15 to reset is arranged between the bottom of the movable valve core 15 and the concave hole.
A gel discharge hole 20 is formed in the liquid dispensing head 2, and the gel storage chamber S2 communicates with the gel discharge hole 20 via a gel overflow hole 17 and a gel overflow pipe 10 to discharge surplus gel; wherein the gel overflow hole 17 is formed on the fixing plug 14; wherein, the gel overflow pipe 10 is sleeved in the inner cylinder 9, and a gap is formed between the gel overflow pipe 10 and the inner cylinder 9 to form a liquid channel communicating the second hydraulic chamber Y2 and the second branch.
The soil sample collection chamber S1 is defined by the stationary plug 14 and the downwardly extending connecting inner cylinder 8, and the volume of the soil sample collection chamber S1 gradually increases as the connecting inner cylinder 8 extends downward.
A gap is arranged between the connecting outer cylinder 7 and the connecting inner cylinder 8 to form a gel extrusion channel which is communicated with the gel storage chamber S2 and the soil sample collecting chamber S1; the upper portion of the connecting inner cylinder 8 has an opening to communicate the gel extruding passage and the gel storage chamber S2.
A housing recess for housing a cutting blade 11 is formed inside the cutting shoe 13, and the cutting blade 11 is housed in the housing recess during the downward movement of the first piston 3; a soil sample collection port C1 through which a soil sample enters the soil sample collection chamber S1 is formed in the bottom of the cutting shoe 13, and in a state where the cutting blade 11 is stored, the inner diameter of the cutting blade 11 is slightly larger than the inner diameter of the soil sample collection port C1 so that a gel injection gap for coating the soil sample with gel is formed between the inner wall of the cutting blade 11 and the outer wall of the collected soil sample. In another embodiment, the cutting blade 11 may have the same inner diameter as the soil sample collection port C1, and the soil sample may be sealed by the pressure of the gel storage chamber S2.
The upper end part of the outer cylinder 6 is fixedly arranged on the outer side wall of the liquid distribution head 2, the upper end part of the inner cylinder 9 is fixedly arranged on the inner side wall of the liquid distribution head 2, and the first piston 3 is arranged between the outer cylinder 6 and the inner cylinder 9 and is respectively connected with the outer cylinder 6 and the inner cylinder 9 in a sliding sealing manner; the upper end part of the connecting outer cylinder 7 is fixedly arranged on the outer side wall of the first piston 3, the upper end part of the guide cylinder 5 is fixedly arranged on the inner side wall of the first piston 3, and the second piston 4 is arranged between the connecting outer cylinder 7 and the guide cylinder 5 and is respectively connected with the connecting outer cylinder 7 and the guide cylinder 5 in a sliding sealing manner.
In the invention, the connecting outer cylinder 7 plays a role in resisting the injection resistance in the process of injecting the catcher, and prevents the connecting inner cylinder 8 from deforming to influence the soil sampling quality. The connecting inner cylinder 8 is used for actual soil taking and can be conveniently detached. In specific implementation, the inner diameter of the connecting inner cylinder 8 is 71.4mm, and the outer diameter is 75.4 mm; the inner diameter of the connecting outer cylinder is 83mm, and the outer diameter of the connecting outer cylinder is 88 mm; when the inner diameter of the cutting edge of the cutting shoe 13 is 71.2mm, which is slightly smaller than the inner diameter of the connecting inner cylinder 8, and the cutting edge of the cutting shoe 14 is 5 °, the internal clearance ratio ICR of the catcher becomes 0.28%, which is close to 0.
As shown in fig. 1, the liquid distribution head 2 is provided with a water inlet passage 19 and a gel outlet hole 20, the water inlet passage 19 enables the drill rod joint 1 to be communicated with the cavity formed by the upper end surfaces of the outer cylinder 6, the inner cylinder 9 and the first piston 3, and the gel outlet hole 20, the gel overflow pipe 10 and the gel overflow hole 17 form a surplus gel solution outlet path. The top of the connecting inner cylinder 8 is circumferentially distributed with gel flowing holes 21, and the gel flowing holes 21 enable the inner cavity of the connecting inner cylinder 8 to be communicated with the annular cavity formed between the connecting inner cylinder 8 and the connecting outer cylinder 7. The lower part of the cutting knife 11 is provided with a plurality of cutting blades 25, the bottom surfaces of the cutting blades 25 are in contact with the inner chamfer of the cutting shoe 13, the annular cavities formed between the inner cavity of the connecting inner cylinder 8 and the connecting outer cylinder 7 are communicated through gaps 26 between the adjacent cutting blades 25, and the inner diameter of the cutting knife 11 is the same as that of the connecting inner cylinder 8. The lower part of the inner cylinder 9 is provided with a liquid inlet valve hole 22 along the circumference, and the outer wall of the movable valve element 15 is tightly attached to the inner wall of the inner cylinder 9 to block the liquid inlet valve hole 22.
The cutting blade 25 of the cutting knife is thin, so that the cutting blade 25 is bent inwards along the inner side chamfer of the cutting shoe 13 in the soil sample sealing process, and the soil sample sealing effect is achieved.
As shown in fig. 2(a) and 2(b), the fixed plug 14 is provided with a movable valve core 15, the movable valve core 15 is provided with three driven rods 27, and the return spring 16 is fixedly arranged inside the fixed plug 14 and is in pressing contact with the movable valve core 15. A gel overflow hole 17 is formed in the fixed plug 14, the external thread of the gel overflow pipe 10 is hermetically connected with the internal thread of the concave hole of the fixed plug 14, and the gel overflow hole 17 is communicated with the gel overflow pipe 10. An O-shaped sealing ring groove 23 is formed in the side wall of the fixing plug 14, an O-shaped sealing ring 24 matched with the width of the groove is installed in the O-shaped sealing ring groove 23, and the periphery of the O-shaped sealing ring 24 is in close contact with the inner wall of the connecting inner cylinder 8.
Wherein, three gel overflow holes 17 are evenly distributed on the fixed plug 14, the diameter of each gel overflow hole is 4mm, so as to better discharge redundant gel solution and avoid causing overlarge hydraulic pressure to the catcher. The gel overflow tube 10 has an inner diameter of 10mm and an outer diameter of 12 mm. The width of annular groove 23 is 2mm, and the diameter of O type sealing washer 24 is 2mm, and O type sealing washer 24 closely laminates and connects inner tube 8 inner wall, avoids gel solution to flow out along the little clearance of fixed 14 peripheries of stopper and being connected inner tube 8 inner wall in the sampling process, plays sealed effect.
The gel solution used by the invention is a polymer gel solution, in particular to Partially Hydrolyzed Polyacrylamide (PHP) which is generally called as PHP polymer, has good lubricating property, can be attached to the surface of a soil sample like lubricating oil to form a film with good lubricating property, and greatly reduces the friction force of the soil sample entering the connecting inner cylinder of the connecting inner cylinder.
As shown in fig. 3 and 5, the movable valve core 15 is provided with three driven rods 27, and the driven rods 27 are pressed down by the guide cylinder 5 to activate the soil sample sealing process during sampling. The lower part of the cutting knife 11 is provided with a plurality of cutting blades 25, the bottom surfaces of the cutting blades 25 are in chamfer contact with the inner side of the cutting shoe 13, the annular cavities formed between the inner cavity of the connecting inner cylinder 8 and the connecting outer cylinder 7 are communicated through gaps 26 between the adjacent cutting blades 25, and the inner diameter of the cutting knife 11 is the same as that of the connecting inner cylinder 8. When the driven rods 27 are pressed down, the movable valve core 15 moves downwards to open the liquid inlet valve hole 22 on the inner cylinder 9, liquid flows into a cavity formed between the lower end face of the first piston 3 and the upper end face of the second piston 4 through the piston water inlet hole 18, hydraulic pressure acts on the interface between the two advancing pistons to force the second piston 4 to generate downward acting pressure, the hydraulic pressure acting on the second piston 4 pushes the connecting inner cylinder 8 and the cutting knife 11 to move downwards, the cutting blade 25 of the cutting knife 11 is bent inwards along the chamfer on the inner side of the cutting shoe 13 to fold, and a soil sample is fixed in the connecting inner cylinder 8 to achieve the effect of sealing the soil sample.
As shown in fig. 4, the internal thread of the concave hole at the lower part of the first piston 3 is connected with the external thread at the upper end of the guide cylinder 5, the inner wall of the guide cylinder 5 is in sealing sliding fit with the inner cylinder 9, and the second piston 4 is in sealing sliding fit with the guide cylinder 5. The first piston 3 is provided with a piston water inlet 18, and the piston water inlet 18 is communicated with a cavity formed between the lower end surface of the first piston 3 and the upper end surface of the second piston 4.
The detailed working principle and process of the push-in-situ geotome of the present application are described in detail below with reference to fig. 6, 7 and 8.
Putting the catcher into a drill hole, penetrating slurry which possibly falls into the drill hole, and reducing the depth of the last rotary drilling; when the catcher reaches the required sampling depth, the hollow drill rod is fixed in place on the ground surface, and the hollow drill rod is connected with the water pump after being filled with water. First a bypass valve is opened and then the water pump is started to return the water flow initially to the tank, after which the bypass valve is gradually closed to allow the water pressure to act on the first piston 3. The water pressure pushes the connecting outer cylinder 7 of the lower connecting cutting shoe 13 into the soil, while the connecting inner cylinder 8 is unstressed.
The hydraulic pressure acting on the first piston 3 pushes the connecting outer cylinder 7 and the connecting inner cylinder 8, while the fixing plug 14 fixes its position relative to the liquid dispensing head 2 by means of the inner cylinder 9, and the reduction in volume between the first piston 3 and the fixing plug 14 forces a portion of the polymer gel to flow through the gel flow holes 21 circumferentially distributed at the top of the connecting inner cylinder 8, down the annular gap between the connecting inner cylinder 8 and the connecting outer cylinder 7. The gel flowing to the inner wall of the lower cutting shoe 13 passes through the gaps between the cutting blades 25 of the cutting blade 11 and wraps the outer surface of the catcher, which takes the soil sample. The remaining gel solution enters the gel overflow hole 17 of the fixing plug 14, flows upward along the gel overflow pipe 10 of the geotome and is discharged into the drilled hole through the gel discharge hole 20.
Once the soil sampler is pushed to a certain depth, the bottom surface of the guide cylinder 5 is contacted with a driven rod 27 protruding from the upper surface of the fixed plug 14, the driven rods 27 are pressed down, the movable valve core 15 moves downwards to open the liquid inlet valve hole 22 on the inner cylinder 9, liquid flows into a cavity formed between the lower end surface of the first piston 3 and the upper end surface of the second piston 4 through the piston water inlet hole 18, hydraulic pressure acts on the interface between the two advancing pistons to force the second piston 4 to generate downward acting pressure, the hydraulic pressure acting on the second piston 4 pushes the connecting inner cylinder 8 and the cutting knife 11 to move downwards, the cutting blade 25 of the cutting knife 11 folds inwards along the chamfer of the inner surface of the cutting shoe 13 to fix the soil sample in the connecting inner cylinder 8, and the effect of sealing the soil sample is achieved.
After sampling is complete, the fixed plug 14 is fully seated in the connecting inner barrel 8 and sample recovery rates approaching 100% can be achieved. For example, in the case of 100% sample recovery and 1m of soil sampler advancement, a high-quality soil sample 92 cm long will be obtained, which can provide a sufficient length of sample for later soil sample analysis and can ensure the accuracy of the later soil sample analysis.
In summary, it can be seen from the above detailed description of the push-in-place geotome of the present invention that:
1) the application discloses push-in normal position geotome utilizes liquid pressure to promote first piston and second piston downstream together earlier, promotes the connection urceolus that is in the same place rather than linking together through first piston and cuts into the boots and insert the sample in the soil downwards, and at this in-process, utilize these two to move the motion of piston for the fixed stopper and extrude the gel between second piston and the fixed stopper to make the gel flow to cut into the boots inner wall and pass the clearance between the cutting blade of cutting off the sword, wrap up the surface of taking the soil sample uniformly.
The soil sampling pushing mode can improve the soil sampling efficiency, and can synchronously and uniformly wrap the gel on the surface of the soil sample so that the soil sample enters the connecting inner cylinder without disturbance.
(2) When the first piston and the second piston move downwards relative to the fixed plug to a preset position, the lower part of the second piston is contacted with the driven rod, the driven rod is downwards extruded by the second piston along with the continuous downward movement of the first piston and the second piston so as to overcome the elastic force of the return spring and move downwards, after the driven rod moves downwards, the liquid inlet valve hole is opened so as to form a liquid channel between the liquid inlet valve hole of the inner cylinder and the piston water inlet hole of the first piston, liquid flows into the interface between the first piston and the second piston, so that the second piston is pushed by liquid pressure to move downwards relative to the first piston so as to drive the connecting inner cylinder connected with the second piston to move downwards, and finally, a soil sample coated with gel on the surface enters the connecting inner cylinder basically without friction, and the soil sample disturbance caused by the large friction force between the soil sample and the connecting inner cylinder can be effectively avoided (especially more obvious when the soil sample is sandy soil) .
Through the mode, the connection inner cylinder does not need to be driven to move downwards by arranging another power device, and the corresponding liquid passage can be automatically opened after the movable piston moves downwards to the preset position, so that the existing liquid can be utilized to provide pressure to push the connection inner cylinder to move downwards, the overall structure and the cost of the power pushing device of the push-in type in-situ soil sampler are well simplified, and the overall coordination and the automation level are obviously improved.
(3) When the connecting inner cylinder moves downwards to a proper position, the cutting blades of the cutting knife connected with the lower end of the connecting inner cylinder are extruded with the chamfers cut into the inner surface of the boot, so that the cutting blades are folded inwards, finally, the lower end of the sand soil sample is cut off and kept in the connecting inner cylinder, and then the soil sampler is lifted upwards and the soil sample is taken out.
The lower end of the connecting inner cylinder is connected with the cutting-off knife, after the connecting inner cylinder moves downwards to a proper position, the thin cutting blade can be automatically folded inwards by utilizing the interaction force between the cutting blade of the cutting-off knife and the chamfer angle on the inner surface of the cutting-in boot, so that the lower end of the soil sample is cut off, the soil sample is reliably kept in the connecting inner cylinder through the folded cutting blade, the phenomenon that the soil sample falls or falls off when the catcher is taken out upwards is prevented, and the soil sampling quality is further ensured.
Claims (10)
1. A push-in-situ soil sampler for taking a soil sample and maintaining its in-situ characteristics, comprising:
a cutting mechanism which moves downwards along a longitudinal axis to cut into the soil sample and limits a soil sample collecting chamber (S1) on a radius perpendicular to the longitudinal axis, wherein the soil sample entering the soil sample collecting chamber (S1) is coated on the outer circumferential surface by the gel solution to maintain the in-situ characteristic; and the number of the first and second groups,
a holding mechanism for (i) storing a gel solution, (ii) outputting the gel solution to the soil sample collection chamber (S1) by pressing, and (iii) cutting the soil sample in a radial direction perpendicular to the longitudinal axis and holding the cut soil sample in the soil sample collection chamber (S1), the outputting the gel solution being performed while the cut soil sample is being cut, the cutting being performed at or after the cut soil sample is terminated.
2. The push-in-place geotome of claim 1 wherein:
the cutting mechanism moves downwards under the driving force of a cutting driving assembly, the cutting mechanism comprises a connecting outer cylinder (7) and a cutting shoe (13) fixedly connected to the connecting outer cylinder (7), the cutting driving assembly comprises a first hydraulic chamber (Y1) and a first piston (3) driven to move downwards by the hydraulic pressure in the first hydraulic chamber (Y1), the connecting outer cylinder (7) is fixedly connected with the first piston (3), and the hydraulic pressure is transmitted to the cutting shoe (13) to cut a soil sample in the longitudinal direction and enable the soil sample to enter a soil sample collecting chamber (S1) in the process of increasing the volume of the first hydraulic chamber (Y1).
3. The push-in-place geotome of claim 2 wherein:
the holding mechanism comprises a gel storage chamber (S2), a second hydraulic chamber (Y2) and a cutting component, wherein the gel storage chamber (S2) is communicated with the soil sample trapping chamber (S1), and liquid gel is extruded into the soil sample trapping chamber (S1) to form the gel coating layer in the process that the gel storage chamber (S2) is compressed;
wherein the cutting assembly comprises a cutting knife (11), a connecting inner cylinder (8) and a second piston (4) driven by hydraulic pressure in a second hydraulic chamber (Y2) to move downwards, the connecting inner cylinder (8) fixedly connects the cutting knife (11) to the second piston (4), and during the volume increase of the second hydraulic chamber (Y2), liquid pressure is transmitted to the cutting knife (11) to cut off the soil sample in the radial direction and keep the soil sample in the soil sample collecting chamber (S1);
preferably: a gap is arranged between the connecting outer cylinder (7) and the connecting inner cylinder (8) to form a gel extrusion channel which is communicated with the gel storage chamber (S2) and the soil sample collecting chamber (S1); the upper part of the connecting inner cylinder (8) is provided with an opening to communicate the gel extrusion channel and the gel storage chamber (S2);
preferably: a containing concave part for containing a cutting knife (11) is formed on the inner side of the cutting shoe (13), and the cutting knife (11) is contained in the containing concave part in the process of moving the first piston (3) downwards;
the bottom of the cutting boot (13) is provided with a soil sample collecting opening (C1) for allowing a soil sample to enter a soil sample collecting chamber (S1), and the inner diameter of the cutting knife (11) is slightly larger than that of the soil sample collecting opening (C1) under the state that the cutting knife (11) is stored so as to form a glue injection gap for coating the gel on the soil sample between the inner wall of the cutting knife (11) and the outer wall of the collected soil sample.
4. The push-in-place geotome of claim 3 wherein:
the cutting knife (11) is provided with at least two cutting blades (25) extending in the longitudinal axis direction, and the cutting shoe (13) is provided with a cutting guide part for guiding the cutting blades (25) to bend inwards when the cutting knife (11) moves downwards.
5. The push-in-place geotome of claim 3 or 4 wherein:
during the enlargement of the first hydraulic chamber (Y1), the first piston (3) is pressed against the second piston (4) and pushes the second piston (4) to move downwards synchronously with the first piston, and the gel storage chamber (S2) is compressed and shrunk;
during the increase of the second hydraulic chamber (Y2), the second piston (4) is driven to move downwards, and the first piston (3) is kept static.
6. The push-in-place geotome of claim 3 or 4 wherein:
the first hydraulic chamber (Y1) is formed by a liquid distribution head (2), an outer cylinder (6), an inner cylinder (9) and a first piston (3) in a surrounding mode, the first piston (3) is located below the liquid distribution head (2), a first branch and a second branch are arranged in the liquid distribution head (2), and the first hydraulic chamber (Y1) is communicated with the first branch;
the second hydraulic chamber (Y2) is formed by a first piston (3), a second piston (3), a connecting outer cylinder (7) and a guide cylinder body (5) which are arranged in a surrounding way, the guide cylinder body (5) is slidably sleeved on the inner cylinder body (9), the upper end part of the guide cylinder body is fixed on the first piston (3), the second piston (4) is positioned below the first piston (3), the second hydraulic chamber (Y2) is communicated with the second branch, and a valve assembly is arranged for opening or closing a liquid channel communicated between the first piston and the second piston;
the gel storage chamber (S2) is formed by a fixed plug (14), an inner cylinder body (9), a second piston (4) and a connecting inner cylinder (8) which are arranged together in a surrounding way, and the fixed plug (14) is arranged below the second piston (4) and is fixedly connected with the bottom of the inner cylinder body (9);
preferably: the soil sample collecting chamber (S1) is formed by enclosing a fixed plug (14) and a connecting inner cylinder (8) extending downwards together, and the volume of the soil sample collecting chamber (S1) is gradually increased in the process that the connecting inner cylinder (8) extends downwards;
preferably: the upper end part of the outer cylinder (6) is fixedly arranged on the outer side wall of the liquid distribution head (2), the upper end part of the inner cylinder (9) is fixedly arranged on the inner side wall of the liquid distribution head (2), and the first piston (3) is arranged between the outer cylinder (6) and the inner cylinder (9) and is respectively connected with the outer cylinder (6) and the inner cylinder in a sliding sealing manner;
the upper end of the connecting outer cylinder (7) is fixedly arranged on the outer side wall of the first piston (3), the upper end of the guide cylinder (5) is fixedly arranged on the inner side wall of the first piston (3), and the second piston (3) is arranged between the connecting outer cylinder (7) and the guide cylinder (5) and is respectively connected with the connecting outer cylinder (7) and the guide cylinder in a sliding sealing manner.
7. The push-in-situ geotome of claim 6, wherein the valve assembly comprises an inlet valve hole (22) and a movable valve core (15) which is normally located at the position for closing the inlet valve hole (22), the movable valve core (15) is vertically and movably arranged in a fixed plug (14), a triggering part is formed at the lower end part of the guide cylinder (5), and at the position where the first piston (3) is close to the fixed plug (14), the triggering part can abut against the movable valve core (15) to separate from the position for closing the inlet valve hole (22) so as to open a liquid channel between the second liquid pressure chamber (Y2) and the second branch.
8. The push-in-situ geotome of claim 1 or 7 wherein the central cavity of the inner cylinder (9) is configured to communicate with a second hydraulic chamber (Y2) and a portion of the liquid passage of the second branch, the inlet valve hole (22) penetrates the side wall of the inner cylinder (9) and communicates with the central cavity thereof, and the second hydraulic chamber (Y2) communicates with the inlet valve hole (22) via a drainage passage formed inside the first piston (3) and the guide cylinder (5).
9. The push-in-place geotome of claim 7 or 8 wherein the movable valve core (15) is disposed in an internal recessed bore within a stationary plug (14) and comprises:
a driven rod (27) which is driven by the propping acting force of the touch part to drive the movable valve core (15) to move downwards integrally;
the sealing cylinder is movably nested in the middle cavity of the inner cylinder (9) to seal the liquid inlet valve hole (22) from the inner side;
wherein, the driven rod (27) is one or more;
and a return spring (16) which can apply force upwards to push the movable valve core (15) to return is arranged between the bottom of the movable valve core (15) and the concave hole.
10. The push-in-place geotome of claim 6 wherein:
a gel discharge hole (20) is formed in the liquid dispensing head (2), and the gel storage chamber (S2) communicates with the gel discharge hole (20) via a gel overflow hole (17) and a gel overflow pipe (11) to discharge an excess gel;
wherein the gel overflow hole (17) is formed on the fixing plug (14);
the gel overflow pipe (10) is sleeved in the inner cylinder body (9), and a gap is formed between the gel overflow pipe (10) and the inner cylinder body (9) to form a liquid channel communicated with the second hydraulic chamber (Y2) and the second branch.
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| CN202010244849.9A CN111426506A (en) | 2020-03-31 | 2020-03-31 | Push-in type in-situ soil sampler |
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| CN114544230A (en) * | 2022-02-24 | 2022-05-27 | 浙江省工程物探勘察设计院有限公司 | Soil property detection device for geological survey engineering |
| CN114752658A (en) * | 2022-06-15 | 2022-07-15 | 上海邦先医疗科技有限公司 | Nucleic acid detection method and system based on micro-fluidic chip |
| CN117030337A (en) * | 2023-10-08 | 2023-11-10 | 中佳勘察设计有限公司 | Soil sampler with cutting function |
| CN117250033A (en) * | 2023-07-03 | 2023-12-19 | 天津华北地质勘查总院 | Sampling device for mineral exploration |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113281094A (en) * | 2021-06-28 | 2021-08-20 | 中国科学院武汉岩土力学研究所 | Sampling and curing system and method for undisturbed sandy soil |
| CN114544230A (en) * | 2022-02-24 | 2022-05-27 | 浙江省工程物探勘察设计院有限公司 | Soil property detection device for geological survey engineering |
| CN114544230B (en) * | 2022-02-24 | 2024-03-08 | 浙江省工程物探勘察设计院有限公司 | Soil property detection device for geological survey engineering |
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| CN117250033A (en) * | 2023-07-03 | 2023-12-19 | 天津华北地质勘查总院 | Sampling device for mineral exploration |
| CN117250033B (en) * | 2023-07-03 | 2024-04-02 | 天津华北地质勘查总院 | Sampling device for mineral exploration |
| CN117030337A (en) * | 2023-10-08 | 2023-11-10 | 中佳勘察设计有限公司 | Soil sampler with cutting function |
| CN117030337B (en) * | 2023-10-08 | 2023-12-26 | 中佳勘察设计有限公司 | Soil sampler with cutting function |
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