CN112683618B - Torsion-resistant undisturbed root soil complex triaxial sample preparation device - Google Patents
Torsion-resistant undisturbed root soil complex triaxial sample preparation device Download PDFInfo
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Abstract
A triaxial sample preparation device of a torsion-resistant undisturbed root soil complex comprises a fixing device, a transmission device, a sample restraint device and a root cutting device; when cutting, the blades are tightly adhered to the support rod in parallel, the blades are sequentially cut from top to bottom, when one side of a sample is cut properly, the raised handle is clamped and pinched by hands to perform angle rotation, at the moment, the rotation of the lower nail plate drives the lower gear I to rotate together, the lower gear II, the rotating rod, the upper gear II and the upper gear I all rotate together, the sleeve is welded with the upper gear I, so that when the sleeve is fixedly connected with the lifting rod by using a fixing screw, the upper nail plate rotates together, and after a soil sample rotates to a proper angle, the cutting action is repeated until the original root soil complex reaches the standard size; pruning the protruding root systems on the surface of the sample one by one; after trimming, loosening the fixing screw, lifting the lifting rod, taking down the sample from the fixing device, and cutting off redundant parts; has the characteristics of simple sample preparation, reasonable sample preparation and convenient operation.
Description
Technical Field
The invention belongs to the technical field of indoor geotechnical test in civil engineering disciplines, and particularly relates to a triaxial sample preparation device for a torsion-resistant undisturbed root soil complex.
Background
At present, along with the rapid development of technical economy, large-scale engineering construction and resource development generate a large number of artificial slopes, serious soil erosion and land desertification are caused, and a large number of exposed slopes are formed. In order to effectively protect the slope and avoid permanent damage to the ecology, the ecological slope protection technology is gradually the best technology for a plurality of students to overcome the difficulty. Therefore, in order to further explore the mechanism of vegetation reinforcement side slope, the mechanical property of the undisturbed root soil complex in the vegetation slope protection period is explored, and an indoor triaxial compressor is generally adopted to conduct a shear test on the undisturbed root soil complex, so that the internal friction angle and the cohesive force of the shear strength index of the root soil complex are measured, and the method has important significance in the field of geotechnical vegetation slope protection test. However, in the process, the preparation of the sample for the triaxial test of the root-soil complex is a key link which is troublesome and easily causes great errors in the whole test result.
Firstly, a simple triaxial sample preparation device is commonly used for preparing a root-soil complex sample, which is relatively difficult and difficult to sample, because for the root-soil complex, roots which are staggered horizontally and longitudinally and have uneven thickness exist in soil body, the roots have potential splitting effect on the soil body, and if the triaxial sample with conventional size (diameter 39.1mm and height 80 mm) is prepared again, the root-soil complex is easily damaged once the roots are disturbed in the sample preparation process because of the small cross section.
Secondly, when the common triaxial sample is prepared, the soil sample to be cut is fixed on a simple device with an upper nail disc and a lower nail disc, and then the soil sample is cut by a soil cutter, so that the sample is prepared. However, the sample preparation device with simple structure has a larger problem that in the process of cutting rotation, the lower nail plate is often rotated to drive the soil sample, the soil sample drives the upper nail plate, and thus the three bodies are synchronously rotated to cut, if the sample preparation device is adopted to prepare a root-soil composite sample, the original soil body has potential splitting effect due to the existence of root systems, and in addition, the operation process is extremely easy to generate torque on the original root-soil composite soil sample, the structure of the sample can be subjected to potential torsion damage in the preparation process, and the experimental result is extremely influenced.
Thirdly, for the root soil complex, because the root system with uneven thickness is contained in the root soil complex, once the pruning operation of the root system is improper in the sample preparation process, the root soil complex is easily damaged, and the experimental result error is caused.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a torsion-resistant undisturbed root-soil complex triaxial sample preparation device, which aims to solve the main problems of the traditional triaxial sample preparation device in preparing a root-soil complex sample, namely the problems of small sample cross section, easiness in torsion damage in the sample preparation process, high sample preparation difficulty and difficulty in processing root systems in the sample preparation process; has the characteristics of simple sample preparation, reasonable sample preparation and convenient operation.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a triaxial sample preparation device of a torsion-resistant undisturbed root soil complex comprises a fixing device, a transmission device, a sample restraint device and a root cutting device;
the fixing device comprises an upper bottom plate, support rods and a lower bottom plate, wherein the upper bottom plate and the lower bottom plate are connected through the four support rods;
the transmission device comprises an upper gear I, an upper gear II, a rotary rod, a lower gear I, a lower gear II and a rolling bearing; the first lower gear is a hollow gear, a rolling bearing is embedded in the hollow part of the first lower gear, the first lower gear is welded with the rolling bearing, the rolling bearing is fixed on a lower bottom plate, the first lower gear is meshed with the first lower gear, the second lower gear is welded with a rotary rod, the bottom of the rotary rod is welded with the second rolling bearing, the rolling bearing is also fixed on the lower bottom plate, meanwhile, the second upper gear is welded with the rotary rod, the rolling bearing is also arranged at the lap joint part of the rotary rod and the upper bottom plate, the second upper gear is meshed with the first upper gear, the rolling bearing is embedded in the hollow part of the first upper gear, the first upper gear is welded with the rolling bearing, and the rolling bearing is fixed on the upper bottom plate;
the sample restraining device comprises a lifting rod, a sleeve, a fixed screw, an upper nail plate and a lower nail plate; the upper nail plate is fixed at the end part of the lifting rod by means of screws, and the sleeve is welded with the upper gear I along with the up-and-down movement of the lifting rod, the fixed screws play a role in fixing the lifting rod to move up and down and connecting the upper gear I, the lower nail plate is fixed on the lower gear I, and the upper nail plate and the lower nail plate play a role in fixing soil samples;
the root cutting device comprises an arc-shaped cylindrical blade, a handle and a connecting screw; the arc-shaped cylindrical blade is provided with two identical arc-shaped blades with the inner wall radius of 35mm and the outer wall radius of 37mm, the thickness of the arc-shaped blades is gradually reduced from outside to inside, handles are arranged on two sides of the arc-shaped cylindrical blade, and the middle of the handles is connected through a connecting screw.
The lower bottom plate is a cuboid with the length of 142mm, the width of 72mm and the height of 15 mm; the upper bottom plate is a cuboid with the length of 142mm, the width of 72mm and the height of 10 mm; the upper nail plate and the lower nail plate are stainless steel round cakes with the diameter of 61.8mm and the thickness of 10mm, steel nails with the thickness of 10mm are uniformly arranged on the upper surface and the lower surface of the stainless steel round cakes, and the centers of the upper nail plate and the lower nail plate are overlapped; 4 raised handles are uniformly arranged on the side surface of the lower nail plate circular disc, so that the rotary cutter is convenient to cut soil.
The diameters of the lower gear I, the upper nail disc and the lower nail disc are the same, and are 61.8mm, and the lower nail disc and the lower gear I are fixed together; the diameter sizes of the lower gear II and the upper gear II are the same, and the diameters of the lower gear II and the upper gear II are 38mm.
The sleeve is welded with the first upper gear, threaded holes are formed in two sides of the sleeve, and the first upper gear can drive the lifting rod to rotate.
The support column is four cylindrical steel columns with the same length and diameter, the lower end of the support column is connected with the lower bottom plate through threads, the upper end of the support column penetrates through the upper bottom plate through a groove, and then the support column is fixed through tightening by a nut.
The diameter of the arc-shaped cylindrical blade is 61.8mm and is larger than that of a standard sample; when cutting roots, the arc-shaped cylindrical blade is vertical and forms a unique vertical line with the side surface of the sample, and other parts of the blade are not contacted with the sample; the arc cylinder blade is two identical arc steel sheets with the inner wall radius of 35mm and the outer wall radius of 37mm and gradually reduced from far to near thickness, the vertical blade and the side surface of the sample are the only vertical line when cutting root, and other parts of the blade are not contacted with the sample.
The handles are b-shaped components, threaded holes are formed in the centers of the straight edges, the number of the handles is two, and the middle parts of the handles are connected through connecting screws.
The diameter size of the first upper gear is larger than that of the second upper gear.
The diameter size of the first lower gear is larger than that of the second lower gear.
The working principle of the invention is as follows:
according to the invention, the lower gear I fixed with the lower nail disc is driven by rotating the lower nail disc, the lower gear I is meshed with the lower gear II, so that the lower gear II is driven to rotate, the lower gear II is fixed on the rotating rod, so that the rotating rod is driven to rotate, the upper gear II and the rotating rod synchronously rotate, the upper gear II rotates to drive the upper gear I meshed with the upper gear II to rotate, then the sleeve and the lifting rod are fixed together by the fixing screw, and the lifting rod with the upper nail disc fixed at the end part synchronously rotates along with the rotation of the upper gear I because the upper gear I is welded with the sleeve, so that the upper nail disc and the lower nail disc synchronously rotate instead of driving the upper nail disc to rotate by a sample, and the problem of easy torque to the root soil complex in the sample preparation process is effectively eliminated (so that the sample preparation is reasonable). After the root soil complex sample is formed, the root system with the protruding surface is treated by the root cutting device. And taking out the prepared sample after finishing trimming.
The beneficial effects of the invention are as follows:
because the invention mainly aims at triaxial sample preparation of the root soil complex, firstly, in order to avoid the problem of large difficulty in sample preparation caused by smaller cross section, the cross section area of the prepared sample is increased. Secondly, in order to effectively eliminate the problem of torsion loss caused to the root soil complex during sample preparation of the traditional sample preparation device, the invention utilizes the gear transmission principle, namely, the lower nail disc is fixed on the first lower gear, the first lower gear is meshed with the second lower gear, the second lower gear is connected with the second upper gear through a rotating rod, the second upper gear is meshed with the first upper gear, and the upper large gear is fixed together with a lifting rod with the upper nail disc at the end part through a sleeve and two fixing screws, so that when the lower nail disc rotates, the upper nail disc synchronously rotates under the gear transmission; finally, in order to avoid the disturbance caused by the straight blade or scissors when the root of the undisturbed sample of the root soil complex is trimmed, the invention is also provided with a special root trimming device, thereby accurately and efficiently completing the sample preparation.
The invention increases the cross section area of the root soil complex sample prepared by the method and reduces the failure rate of sample formation in the sample formation process. Simultaneously, a set of gears are arranged on the upper part and the lower part of the sample preparation device, and the upper nail plate and the lower nail plate synchronously rotate by utilizing the gear transmission principle through the connection of the rotating rods, so that the problem of torque damage to the root soil complex in the sample preparation process is effectively solved. The root cutting treatment device is matched with the b-shaped handle through the two arc-shaped cylindrical blades, so that the root system protruding from the surface of the root soil complex sample can be easily and conveniently treated, and the disturbance of the root system to the root soil complex is reduced compared with the treatment of the root system by using a straight blade or a common pair of scissors.
In combination with the above, the torsional undisturbed root soil complex triaxial sample preparation device has the following advantages:
firstly, the invention has wide application range, and can be suitable for preparing samples of root soil composites and other soil preparations.
Secondly, the invention changes the specification of the traditional triaxial sample preparation device, enlarges the cross-sectional area of the prepared root-soil complex sample, and greatly reduces the disturbance to the root-soil complex in the sample preparation process.
Thirdly, the invention utilizes the transmission device with the gear, thereby effectively eliminating the problem of torque damage to the root soil complex caused by the rotary lower chassis in the sample preparation process.
Fourthly, the root cutting device is attached, the cutting blade is in an arc cylinder shape, the blade is attached to the side face of the sample during cutting, and the protruding root system is completely trimmed under the condition that the root-soil complex is not disturbed as much as possible.
Fifthly, the invention has simple operation steps and improves the success rate of sample preparation.
The invention mainly aims at preparing the triaxial sample of the root-soil complex, and the main function is torsion resistance, so the invention is also applicable to torsion resistance problems existing in triaxial sample preparation of other soil bodies. (design of root cutting device, convenient treatment of sample surface root system, reduced secondary damage to sample.)
The invention has the characteristics of simple sample preparation, reasonable sample preparation and convenient operation; because the size of the root-soil composite sample is enlarged, compared with the traditional triaxial small sample size, the difficulty in preparing the root-soil composite sample is reduced, so that the sample preparation is simple; the torque problem easily generated to the root soil complex in the sample preparation process is effectively eliminated, so that the sample preparation is more reasonable; the design of the root shearing device and the cylindrical blade facilitate the pruning of root systems, so the root shearing device has the characteristic of convenient operation.
Drawings
Fig. 1 is a schematic plan view of the structure of the present invention.
Fig. 2 is a schematic perspective view of the structure of the present invention.
Fig. 3 is a schematic structural view of a root cutting device of the present invention.
Fig. 4 is a schematic operation diagram of the root cutting device of the present invention.
FIG. 5 is a schematic view of the meshing structure of the first upper gear and the second upper gear in the present invention.
Fig. 6 is a schematic diagram of a first and second meshing structures of a lower gear of the present invention.
Fig. 7 is a schematic structural view of the lower nail plate of the present invention.
Fig. 8 is a schematic view of a supporting rod according to the present invention.
Fig. 9 is a schematic view of a lifter structure according to the present invention.
Reference numerals in the drawings: the lifting device comprises a lifting rod 1, a sleeve 2, a fixed screw 3, a gear I4, a gear II 5, a nut 6, a base plate 7, a rolling bearing I8, a supporting rod 9, a nail plate 10, a rotary rod 11, a fixed needle 12, a protruding handle 13, a nail plate 14, a gear II 15, a gear II 16, a base plate 17, a rolling bearing II 18, an arc-shaped cylinder blade 19, a blade 20, a connecting screw 21 and a handle 22-b.
Detailed Description
The invention will be described in detail below with reference to the drawings and the detailed description.
1-9, a torsion-resistant undisturbed root soil complex triaxial sample preparation device comprises a fixing device, a transmission device, a sample restraint device and a root cutting device;
the fixing device comprises an upper bottom plate 7, a supporting rod 9 and a lower bottom plate 17, wherein the upper bottom plate 7 and the lower bottom plate 17 are connected through four supporting rods; the supporting rod 9 adopts a cylindrical steel column.
The transmission device comprises an upper gear I4, an upper gear II 5, a rotary rod 11, a lower gear I15, a lower gear II 16 and a rolling bearing I8; the lower gear I15 is a hollow gear, a rolling bearing is embedded in the hollow part of the lower gear I15, the lower gear I15 is welded with the rolling bearing, the rolling bearing is fixed on a lower bottom plate 17, the lower gear I15 is meshed with a lower gear II 16, the lower gear II 16 is welded with a rotating rod 11, the bottom of the rotating rod 11 is welded with a rolling bearing II 18, the rolling bearing is also fixed on the lower bottom plate, meanwhile, an upper gear II 5 is welded with the rotating rod, a rolling bearing I8 is also arranged at the lap joint part of the rotating rod and the upper bottom plate 17, the upper gear II 5 is meshed with an upper gear I4, the rolling bearing is embedded in the hollow part of the upper gear I4, the upper gear I4 is welded with the rolling bearing, and the rolling bearing is fixed on the upper bottom plate;
the sample restraining device comprises a lifting rod 1, a sleeve 2, a fixed screw 3, an upper nail disc 10 and a lower nail disc 14; the upper nail plate 10 is fixed at the end part of the lifting rod 1 by means of screws, and is welded with the upper gear I along with the up-and-down movement of the lifting rod, the fixed screws play a role in fixing the lifting rod 1 to move up and down and connecting the upper gear I, the lower nail plate 14 is fixed on the lower gear I15, and the upper nail plate and the lower nail plate play a role in fixing soil samples;
the root cutting device comprises an arc-shaped cylindrical blade 19, a handle 22 and a connecting screw 21; the arc-shaped cylindrical blade 19 is formed by two identical arc-shaped blades with the inner wall radius of 35mm and the outer wall radius of 37mm and gradually reduced in thickness from outside to inside (namely to the blade), handles are arranged on two sides of the arc-shaped cylindrical blade, and the middle of the handles is connected through a connecting screw.
The lower bottom plate is a cuboid with the length of 142mm, the width of 72mm and the height of 15 mm; the upper bottom plate is a cuboid with the length of 142mm, the width of 72mm and the height of 10 mm; the upper nail plate and the lower nail plate are stainless steel round cakes with the diameter of 61.8mm and the thickness of 10mm, steel nails with the thickness of 10mm are uniformly arranged on the upper surface and the lower surface of the stainless steel round cakes, and the centers of the upper nail plate and the lower nail plate are overlapped; 4 raised handles are uniformly arranged on the side surface of the lower nail plate circular disc, so that the rotary cutter is convenient to cut soil.
The diameter sizes of the lower gear I15, the upper gear I4, the upper nail disc and the lower nail disc are all the same and are 61.8mm, the lower nail disc is fixed with the lower gear I15, the diameter sizes of the lower gear II 16 and the upper gear II 5 are all 38mm, the lower gear II and the upper gear II are both welded with a rotating rod, the bottom of the rotating rod is welded with a small rolling bearing, and the rolling bearing is also fixed on a lower bottom plate; meanwhile, the upper gear II 5 is welded with a rotating rod, and a rolling bearing I8 is arranged at the lap joint of the rotating rod and the upper bottom plate.
The sleeve 2 is welded with the first upper gear 4, threaded holes are formed in two sides of the sleeve and are used for accommodating fixing screws, the first upper gear 4 and the lifting rod are connected into a whole by tightening the fixing screws, and the lifting rod is driven to rotate by rotation of the first upper gear 4.
The support column 9 is four cylindrical steel columns with the same length and diameter, the lower end of the support column is connected with the lower bottom plate through threads, the upper end of the support column penetrates through the upper bottom plate through a groove, and the support column is fixed by tightening through a nut.
The diameter of the arc-shaped cylindrical blade 19 is 61.8mm and is larger than that of a standard sample; when cutting roots, the arc-shaped cylindrical blade is vertical and forms a unique vertical line with the side surface of the sample, and other parts of the blade are not contacted with the sample (the radius of the standard sample is 30.9 mm), so that the sample is prevented from being extruded and deformed; the arc-shaped cylindrical blades in the root cutting device are two identical arc-shaped steel sheets with the inner wall radius of 35mm and the outer wall radius of 37mm and gradually reduced in thickness from far to near (namely to the blade), the vertical blades and the side surfaces of the test samples form unique vertical lines when the root is cut, and other parts of the blades are not contacted with the test samples (the radius of the standard test samples is 30.9 mm). The handles are b-shaped components, threaded holes are formed in the centers of the straight edges, the number of the handles is two, and the middle parts of the handles are connected through connecting screws.
The diameter size of the first upper gear 4 is larger than that of the second upper gear 5.
The diameter size of the first lower gear 15 is larger than that of the second lower gear 16.
The upper nail plate 10 and the lower nail plate 14 are respectively provided with a fixing needle 12 for fixing a sample to be cut.
The four directions of the side surface of the lower nail plate 14 are uniformly provided with the raised handles 13, and the raised handles are used for conveniently rotating the lower nail plate in the sample preparation process.
As shown in connection with figures 1-9,
the upper bottom plate is a cuboid with the length of 124mm, the width of 72mm and the height of 10mm, and the lower bottom plate is a cuboid with the length of 142mm, the width of 72mm and the height of 15 mm; the four support rods are cylindrical steel columns, the diameter is 12mm, the length is 300mm, the partial detail view is shown in fig. 8, the cross section of the steel column at the upper thread section 91 and the upper thread transition section 92 of the support rods is reduced, the diameter is retracted inwards by 1mm, the upper thread section 91 penetrates through the upper bottom plate and is fixed by the screw cap 6, and the lower thread section 93 is fixed with the lower bottom plate.
The upper gear I4 and the lower gear I15 are the same in specification (the diameters are 61.8 mm), the upper gear II 5 and the lower gear II 16 are the same in specification (the diameters are 38 mm), the rotary rod 11 is a steel column with the diameter of 6mm, the through length and the cross section area are the same, the upper gear II 5 and the lower gear II 16 are fixedly welded on the 11 rotary rod, and the rolling bearing I8 and the rolling bearing II 18 are respectively hidden in the upper bottom plate and the lower bottom plate, as shown in fig. 1.
The length of the lifting rod 1 is 180mm, the diameter is 6mm, the partial detail view is shown in fig. 9, the upper end 101 of the lifting rod 1 is a fixed cylindrical handle, the partial side wall of the lower end 102 of the lifting rod 1 is recessed inwards by 1mm and is a plane, and the lifting rod is used for conveniently fixing the upper nail plate 10; the sleeve 2 and the first upper gear 4 are welded together, threaded holes are symmetrically distributed on two sides of the sleeve respectively and are used for installing the fixing screw 3, so that the first upper gear 4 and the lifting rod 1 are connected together to form a whole. The diameter sizes of the upper nail plate 10 and the lower nail plate 14 are the same and are 61.8mm, and the lower nail plate 14 is positioned above the first lower gear 15 and welded and fixed together.
The root cutting device is shown in figure 3, the radius of the inner wall of the arc-shaped cylindrical blade 19 is 35mm, the radius of the outer wall of the arc-shaped cylindrical blade 19 is 37mm, the height of the arc-shaped cylindrical blade is 120mm, the thickness of the arc-shaped cylindrical blade is gradually reduced from outside to inside (namely to the blade), in a closed state, only the blade 20 is tangent to the side surface of a sample, and the rest parts are not contacted with the sample. The b-shaped handle 22 is fixed with the arc-shaped cylindrical blade 19, and the intersection of the two handles 22 is engaged by an engagement screw 21.
The working principle of the invention is as follows:
the method for preparing the triaxial sample of the undisturbed root-soil complex in the embodiment comprises the steps of preparing the sample, cutting the sample, treating the root system and taking out the soil sample, and comprises the following steps:
1) And preparing a sample. Placing an undisturbed root soil composite soil sample to be cut between the upper nail plate 10 and the lower nail plate 14, and screwing the fixing screws 3 on two sides of the sleeve 2 after the soil sample is adjusted;
2) And cutting the undisturbed root soil composite sample. When cutting, the blades are sequentially cut from top to bottom, when one side is cut properly, the raised handle 13 is clamped and pinched by hands to perform angle rotation, at the moment, the rotation of the lower nail disc 14 drives the lower gear I15 to rotate together, because of the transmission principle of the gears, the lower gear II 16, the rotating rod 11, the upper gear II 5 and the upper gear I4 all rotate together, and meanwhile, because the sleeve 2 and the lifting rod 1 are connected and fixed together by the fixing screw 3, the upper nail disc 10 rotates together, and after a soil sample rotates to a proper angle, the cutting action is repeated until the undisturbed root soil complex reaches the standard size;
3) And treating the root system 24 protruding from the surface of the root-soil complex sample 23. Pruning the protruded root systems 24 on the surface of the sample one by using a root cutting device according to the operation schematic diagram shown in fig. 4; the dotted circular line in fig. 4 is the peripheral outline of the standard-sized sample of the produced root soil complex.
4) Taking out the soil sample, after finishing trimming, loosening the fixing screw 3, lifting the lifting rod 1, taking the sample out of the fixing device, cutting off the redundant part, only keeping the height of 120mm, namely finishing the manufacture of an undisturbed root-soil composite sample, and placing the cut undisturbed root-soil composite sample in a curing cylinder for use.
Claims (8)
1. The triaxial sample preparation device of the torsional undisturbed root soil complex is characterized by comprising a fixing device, a transmission device, a sample restraint device and a root cutting device;
the fixing device comprises an upper bottom plate (7), support rods (9) and a lower bottom plate (17), wherein the upper bottom plate (7) and the lower bottom plate (17) are connected through the four support rods (9);
the transmission device comprises an upper gear I (4), an upper gear II (5), a rotary rod (11), a lower gear I (15), a lower gear II (16) and a rolling bearing; the lower gear I (15) is a hollow gear, a rolling bearing is embedded in the hollow part of the lower gear I (15), the lower gear I (15) is welded with the rolling bearing, the rolling bearing is fixed on a lower bottom plate (17), the lower gear I (15) is meshed with a lower gear II (16), the lower gear II (16) is welded with a rotating rod (11), the bottom of the rotating rod (11) is welded with a rolling bearing II (18), the rolling bearing is also fixed on the lower bottom plate, meanwhile, the upper gear II (5) is welded with the rotating rod, a rolling bearing I (8) is also arranged at the lap joint part of the rotating rod and the upper bottom plate (17), the upper gear II (5) is meshed with the upper gear I (4), the rolling bearing is embedded in the hollow part of the upper gear I (4), the upper gear I (4) is welded with the rolling bearing, and the rolling bearing is fixed on the upper bottom plate;
the sample restraining device comprises a lifting rod (1), a sleeve (2), a fixing screw (3), an upper nail disc (10) and a lower nail disc (14); the upper nail plate (10) is fixed at the end part of the lifting rod (1) by means of screws, and moves up and down along with the lifting rod, the sleeve (2) is welded with the upper gear I, the fixed screws play a role in fixing the lifting rod (1) to move up and down and connecting the upper gear I, the lower nail plate (14) is fixed on the lower gear I (15), and the upper nail plate and the lower nail plate play a role in fixing a soil sample;
the root cutting device comprises an arc-shaped cylindrical blade (19), a handle (22) and a connecting screw (21); the arc-shaped cylindrical blade (19) is provided with two identical arc-shaped blades with the inner wall radius of 35mm and the outer wall radius of 37mm and gradually reduced in thickness from outside to inside, handles are arranged on two sides of the arc-shaped cylindrical blade, and the middle of the handles is connected through a connecting screw.
2. The triaxial sample preparation device for the torsional undisturbed root-soil complex, as claimed in claim 1, wherein the lower base plate is a cuboid with a length of 142mm, a width of 72mm and a height of 15 mm; the upper bottom plate is a cuboid with the length of 142mm, the width of 72mm and the height of 10 mm; the upper nail plate and the lower nail plate are stainless steel round cakes with the diameter of 61.8mm and the thickness of 10mm, steel nails with the thickness of 10mm are uniformly arranged on the upper surface and the lower surface of the stainless steel round cakes, and the centers of the upper nail plate and the lower nail plate are overlapped; 4 raised handles are uniformly arranged on the side surface of the lower nail plate circular disc, so that the rotary cutter is convenient to cut soil.
3. The triaxial sample preparation device for the torsional undisturbed root-soil complex according to claim 1, wherein the diameter sizes of the lower gear I (15), the upper gear I (4), the upper nail plate and the lower nail plate are all the same and are 61.8mm, and the lower nail plate and the lower gear I (15) are fixed together; the diameter sizes of the lower gear II (16) and the upper gear II (5) are the same, and the diameters of the lower gear II and the upper gear II are 38mm.
4. The triaxial sample preparation device for the torsion-resistant undisturbed root-soil complex, as claimed in claim 1, wherein the sleeve (2) is welded with the first upper gear (4), threaded holes are formed in two sides of the sleeve, and the rotation of the first upper gear (4) drives the lifting rod to rotate.
5. The triaxial sample preparation device for the torsion-resistant undisturbed root-soil complex, as claimed in claim 1, wherein the support rods are four cylindrical steel columns with the same length and diameter, the lower ends of the support rods are connected with the lower base plate through threads, and the upper ends of the support rods are slotted to penetrate through the upper base plate and then are screwed down through nuts to be fixed.
6. The triaxial sample preparation device for the torsional undisturbed root-soil complex, according to claim 1, wherein the diameter of the arc-shaped cylindrical blade is 61.8mm and is larger than that of a standard sample; when cutting roots, the arc-shaped cylindrical blade is vertical and forms a unique vertical line with the side surface of the sample, and other parts of the blade are not contacted with the sample; the arc cylinder blade is two identical arc steel sheets with the inner wall radius of 35mm and the outer wall radius of 37mm and gradually reduced from far to near thickness, the vertical blade and the side surface of the sample are the only vertical line when cutting root, and other parts of the blade are not contacted with the sample.
7. The triaxial sample preparation device for the torsion-resistant undisturbed root-soil complex is characterized in that the handle is a b-shaped handle, the center of the straight edge is provided with threaded holes, the number of the handles is two, and the middle parts of the handles are connected through connecting screws.
8. The triaxial sample preparation device for the torsional undisturbed root-soil complex according to claim 1, wherein the diameter size of the first upper gear (4) is larger than that of the second upper gear (5); the diameter size of the first lower gear (15) is larger than that of the second lower gear (16).
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| CN114018670A (en) * | 2021-11-09 | 2022-02-08 | 广西北投交通养护科技集团有限公司 | Intelligent soil cutting device for geotechnical triaxial test and sample preparation method |
| CN114486436A (en) * | 2022-01-26 | 2022-05-13 | 中铁第四勘察设计院集团有限公司 | Device for preparing cutting type undisturbed soil sample |
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