CN217586560U - Special soil sample preparation device - Google Patents
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- CN217586560U CN217586560U CN202221116720.0U CN202221116720U CN217586560U CN 217586560 U CN217586560 U CN 217586560U CN 202221116720 U CN202221116720 U CN 202221116720U CN 217586560 U CN217586560 U CN 217586560U
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Abstract
The application provides a special native system appearance device, special native system appearance device is including making the appearance mould, elastic membrane and die cushion, the upper and lower both ends opening of system appearance mould, be provided with the joint of bleeding on the lateral wall of system appearance mould, the inner chamber intercommunication of joint and system appearance mould of bleeding, the elastic membrane sets up the inner chamber at the system appearance mould, the both ends of elastic membrane extend and overlap respectively to the upper and lower both ends of system appearance mould on the lateral wall of system appearance mould, the system appearance mould is laid on the die cushion, die cushion heightens system appearance mould. The upper end and the lower extreme of elastic membrane all overlap on system appearance mould to improved the sealed effect between elastic membrane and the system appearance mould, and then improved the laminating effect of elastic membrane and system appearance mould, the mould pad will make appearance mould bed hedgehopping, turn over the cover on the base with the elastic membrane lower end when conveniently making good appearance back form removal, disturbance when special native system appearance device can reduce the preparation of soil sample.
Description
Technical Field
The application relates to the field of soil sample preparation, in particular to a special soil sample preparation device.
Background
Currently, the soil sample is prepared by adopting a compaction method. Taking the conventional sample preparation of the triaxial test equipment as an example, conventionally, a soil sample is compacted in a sample preparation mold in a layering manner, then the compacted soil sample is taken out from the sample preparation mold and sleeved with a rubber film in a mold bearing cylinder, and finally the soil sample sleeved with the rubber film is installed on a base of the triaxial test equipment. The operation process is tedious, and the experiment efficiency is very influenced because the soil sample is easily disturbed or even damaged in the process of dismantling the sample preparation mould, loading the rubber membrane and installing the soil sample.
In addition, the traditional layering compaction method is easy to cause the phenomenon that soil samples in all layering sections are sparse at the bottom and dense at the top, so that the density distribution of the prepared samples is not uniform. For some special soils, such as loose sand, mucky soil and the like, the characteristics of difficult molding and easy disturbance make the conventional method no longer applicable.
At present, for special soil such as sandy soil, a method for preparing a soil sample by directly arranging a rubber film and a sample preparation mold of a sample preparation device on a base of triaxial test equipment appears, and the transfer and carrying process of the soil sample is omitted. During the system appearance, need bleed so that the system appearance mould is hugged closely to the system appearance mould, but the system appearance device rubber membrane that adopts at present is poor with the gas tightness between the system appearance mould, and the laminating effect of rubber membrane and system appearance mould is not good, and the easy disturbance soil sample of rubber membrane still can make the degree of consistency and the roughness of soil sample side not good.
SUMMERY OF THE UTILITY MODEL
The present application is directed to solving at least one of the problems in the prior art. Therefore, the application provides a special soil sample preparation device which can reduce disturbance in soil sample preparation.
According to the special soil system appearance device that this application embodiment provided, including system appearance mould, elastic membrane and die cushion, the upper and lower both ends opening of system appearance mould, be provided with on the lateral wall of system appearance mould and bleed the joint, bleed the joint with the inner chamber intercommunication of system appearance mould, the elastic membrane sets up the inner chamber of system appearance mould, the both ends of elastic membrane respectively to the upper and lower both ends of system appearance mould extend and overlap on the lateral wall of system appearance mould, system appearance mould lays on the die cushion, the die cushion bed hedgehopping system appearance mould.
According to the special soil sample preparation device provided by the embodiment of the application, at least the following technical effects are achieved: the upper end and the lower extreme of elastic membrane are turned out the cover and are being made the appearance mould outside to improved the sealed effect between elastic membrane and the system appearance mould, and then improved the laminating effect of elastic membrane and system appearance mould, the die cushion will make appearance mould bed hedgehopping, turn over the cover on the base with the elastic membrane lower end when conveniently making good appearance back form removal, disturbance when special soil system appearance device can reduce soil sample preparation.
According to some embodiments of the present application, the sampling mold comprises a plurality of mold pieces, each mold piece is connected end to end, and a sealing structure is arranged at the joint position of two adjacent mold pieces.
According to some embodiments of the present application, the sealing structure includes at least one of a sealing strip and a sealant.
According to some embodiments of the application, special soil system appearance device includes first restraint piece, first restraint piece cover is established make appearance mould's lateral wall, first restraint piece is spacing each the diaphragm, first restraint piece includes at least one of clamp, larynx hoop.
According to some embodiments of the application, special soil system appearance device includes the second and tightens the piece, two the second is tightened the piece and is established respectively the both ends of system appearance mould, the second is tightened the piece fixedly the elastic membrane, the second is tightened the piece and is included bandage, at least one in the rubber circle.
According to some embodiments of the present application, the die pad includes a backing ring, the backing ring is used for sleeving on a base of a triaxial test equipment, the height of the backing ring is equal to the height of the base.
According to some embodiments of the application, the backing ring comprises a plurality of ring pieces, each of the ring pieces is connected end to end, the ring pieces comprise connecting lugs, and the connecting lugs of two adjacent ring pieces are mutually butted.
According to some embodiments of the application, special native system appearance device includes the sleeve, the sleeve cover is established system appearance mould is last, telescopic top edge highly be higher than system appearance mould's top edge, telescopic bottom edge height is less than system appearance mould's top edge.
According to some embodiments of the application, the special soil sample preparation device comprises a compaction rod, the height of the compaction rod is greater than or equal to the height of the sample preparation mold, and the diameter of the lower end face of the compaction rod is equal to the cross-sectional diameter of the soil sample.
According to some embodiments of the application, the compaction pole includes last pressure disk, lower pressure disk and connecting rod, the both ends of connecting rod are connected respectively go up the pressure disk with down the pressure disk, down the pressure disk down the terminal surface with the distance between the lower terminal surface of last pressure disk equals the height of system appearance mould.
Drawings
The above and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is an isometric view of a special soil sampling device of an embodiment of the present application;
fig. 2 is a schematic cross-sectional view of the special soil sampling device of the present application with the second binding member omitted.
Reference numerals:
a compacting bar 10, a sleeve 20, a pattern die 30, an elastic membrane 40, a die pad 50, a first tightening member 60, a second tightening member 70, a suction adapter 80, and a base 90.
Detailed Description
Reference will now be made in detail to the embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.
In the description of the present application, it should be understood that the positional descriptions referred to, for example, the directions or positional relationships indicated by upper, lower, front, rear, left, right, etc., are based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present application.
In the description of the present application, the meaning of a plurality is one or more, the meaning of a plurality is two or more, and larger, smaller, larger, etc. are understood as excluding the present number, and larger, smaller, inner, etc. are understood as including the present number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present application, unless otherwise expressly limited, terms such as set, mounted, connected and the like should be construed broadly, and those skilled in the art can reasonably determine the specific meaning of the terms in the present application by combining the detailed contents of the technical solutions.
First, the triaxial test and the current typical soil sample preparation protocol will be described.
Triaxial test is a way to test the mechanical properties of a soil sample. In a typical triaxial test, a cylindrical soil sample of standard specification is prepared and placed on the base 90 of a triaxial test apparatus and pressurized in the axial direction until the soil sample is subjected to shear failure. Base 90 and soil sample all arrange the pressure chamber in the pressurization in-process, make soil sample receive even background pressure effect, consequently soil sample need wrap up in elastic membrane 40, and the lower pot head of elastic membrane 40 is on base 90, and the upper end cover of elastic membrane 40 is on the pressurization structure of triaxial test equipment, makes soil sample and external environment isolated.
In the current scheme of soil sample preparation, a sample preparation mold 30 is sleeved on a base 90 of a triaxial test device, the bottom of the sample preparation mold 30 is flush with the bottom of the base 90, the lower end of an elastic membrane 40 is sleeved on the base 90, the upper end of the elastic membrane 40 is sleeved on the upper end of the sample preparation mold 30, and the elastic membrane 40 is tightly attached to the inner wall of the sample preparation mold 30 by pumping air to the sample preparation mold 30. Because there is the gap between the lower extreme of elastic membrane 40 and the lower extreme of system appearance mould 30, lead to the air exhaust effect not good, the laminating effect of elastic membrane 40 and system appearance mould 30 is not good, and the easy disturbance soil sample of elastic membrane 40, the fluctuation of elastic membrane 40 still can make the degree of consistency and the roughness of soil sample side not good.
The utility model provides a special native system appearance device, including system appearance mould 30, elastic membrane 40 and die cushion 50, the upper and lower both ends opening of system appearance mould 30, be provided with on the lateral wall of system appearance mould 30 and bleed joint 80, bleed joint 80 and the inner chamber intercommunication of system appearance mould 30, elastic membrane 40 sets up the inner chamber at system appearance mould 30, elastic membrane 40's both ends extend and overlap on the lateral wall of system appearance mould 30 to the upper and lower both ends of system appearance mould 30 respectively, system appearance mould 30 is laid on die cushion 50, die cushion 50 fills up high system appearance mould 30.
According to the special soil system appearance device that this application embodiment provided, through the die cushion 50 with system appearance mould 30 bed hedgehopping, the upper end and the lower extreme of elastic membrane 40 all turn over the cover in system appearance mould 30 outside, thereby sealed effect between elastic membrane 40 and the system appearance mould has been improved, and then the laminating effect of elastic membrane 40 and system appearance mould has been improved, the special soil system appearance device can reduce the disturbance when the soil sample is prepared, die cushion 50 will make a 30 bed hedgehopping of appearance mould, turn over the lower extreme of elastic membrane 40 and overlap on base 90 when conveniently making a good appearance back form removal.
The soil sample prepared in the traditional triaxial test needs to be saturated in saturation equipment and then is installed on the triaxial equipment, and certain disturbance is caused to the soil sample. After the preparation of this application soil sample is accomplished, lift off die cushion 50, turn over the lower extreme of elastic membrane 40 and overlap on base 90, can normally carry out the triaxial test to the disturbance in the preparation process has been reduced.
It is understood that the elastic membrane 40 is tubular, and the elastic membrane 40 is usually made of rubber, but other structures capable of sealing and isolating may be used, and the material of the elastic membrane 40 is not limited to rubber. The method is mainly used for special soil with easy disturbance characteristics such as sandy soil, and certainly, other kinds of special soil are not excluded.
In some embodiments, the proof mass 30 includes a plurality of dies, each die being connected end-to-end. After the sample preparation is completed, the sample preparation mold 30 can be disassembled into the mold pieces so as to be easily separated from the elastic membrane 40. The mold 30 may be a split mold having two mold pieces or a three-piece mold having three mold pieces, and the reduction in the number of mold pieces correspondingly reduces the number of seams, which helps to ensure sealing performance.
In order to ensure the sealing effect, a sealing structure is arranged at the joint position of two adjacent dies. The seal structure includes at least one of a sealing strip and a sealant. The sealant can be vaseline.
According to some embodiments of the present application, the special soil sampling device includes a first clamping member 60, the first clamping member 60 is sleeved on the outer side wall of the sampling die 30, and the first clamping member 60 limits each of the matrices. The first clamping member 60 makes the tight combination of the dies not easy to loose, and ensures the stable tightness of the sample making die 30. The special soil sample preparation device comprises second tightening pieces 70, wherein the two second tightening pieces 70 are respectively sleeved at two ends of the sample preparation mold 30, and the second tightening pieces 70 fix the elastic membrane 40.
The first tightening member 60 may be a clamp, a hose clamp, or the like, and is characterized by being detachable, avoiding removal from both ends of the sample, and being able to maintain fastening without deformation under a large force. The second tightening member 70 may use a band, a rubber ring, or the like.
According to some embodiments of the present application, the die pad 50 includes a backing ring for fitting over the base 90 of the triaxial test apparatus. The backing ring is fixed on base 90 to can remain stable throughout at system appearance in-process, be difficult for appearing the accident, the backing ring will make 30 bed hedgehopping of appearance mould, with the cover under the rubber membrane lower extreme turn over on base 90 when the form removal after conveniently making the appearance. In some embodiments, referring to fig. 2, the height of the backing ring is lower than the height of the base 90 to ensure that the sample mold 30 can be partially sleeved on the base 90, thereby improving the sealing performance and preventing the soil sample from being extruded out of the bottom of the sample mold 30 during sample pressing.
In some embodiments, the backing ring comprises a plurality of ring segments, each ring segment is connected end to end, the ring segments comprise connecting lugs, and the connecting lugs of two adjacent ring segments are butted with each other. For example, referring to fig. 1, the connecting lugs are provided with connecting holes, and the two connecting lugs are fastened and connected through bolts. Of course, the connecting lug can be connected in a detachable mode such as a buckle, a clamping and the like.
According to some embodiments of the present application, the special soil sampling device includes a sleeve 20, the sleeve 20 is sleeved on the sampling mold 30, the upper edge of the sleeve 20 is higher than the upper edge of the sampling mold 30, and the lower edge of the sleeve 20 is lower than the upper edge of the sampling mold 30. Sleeve 20 can play the effect of blockking, and the soil sample scatters and spills over when avoiding the system appearance to go on the superiors. As shown in fig. 2, the sleeve 20 includes a large end and a small end which are coaxial, wherein the inner diameter of the large end matches with the outer diameter of the sample preparation mold 30, the large end is sleeved on the sample preparation mold, and the inner diameter of the small end matches with the inner diameter of the sample preparation mold 30.
According to some embodiments of the present application, the special soil sampling device includes the compaction bar 10, and the height of the compaction bar 10 is greater than or equal to the height of the sampling mold 30. The soil sample is compacted by applying pressure to the soil sample through the compaction bar 10. In some embodiments, the diameter of the lower end surface of the compaction rod 10 is equal to the cross-sectional diameter of the soil sample, thereby ensuring that the pressure is applied uniformly.
In some embodiments, the compacting bar 10 includes an upper platen, a lower platen, and a connecting rod, both ends of which are respectively connected to the upper platen and the lower platen, and the distance between the lower end surface of the lower platen and the lower end surface of the upper platen is equal to the height of the proof mold 30.
The specific soil sampling device of the present application is described in detail in one specific embodiment with reference to fig. 1 and 2. It is to be understood that the following description is illustrative only and is not intended to be in any way limiting.
The special soil sampling device includes a compaction rod 10, a sleeve 20, a sampling die 30, an elastic membrane 40, a die pad 50, a first tightening member 60, a second tightening member 70, and a suction fitting 80.
The molding die 30 is placed on the die pad 50, and the die pad 50 is raised above the molding die 30. The sample preparation mold 30 comprises two mold pieces, the two mold pieces are mutually butted, the first clamping piece 60 uses a hoop, the first clamping piece 60 is sleeved on the outer side wall of the sample preparation mold 30, and the first clamping piece 60 limits the position of each mold piece. The upper and lower ends of the sample mold 30 are open. The air suction connector 80 is arranged on the outer side wall of the sample preparation mold 30, and the air suction connector 80 is communicated with the inner cavity of the sample preparation mold 30.
The elastic membrane 40 is a rubber membrane, the elastic membrane 40 is arranged in the inner cavity of the sample preparation mold 30, and two ends of the elastic membrane 40 respectively extend to the upper end and the lower end of the sample preparation mold 30 and are sleeved on the outer side wall of the sample preparation mold 30. The second tightening members 70 use rubber rings, two second tightening members 70 are respectively sleeved at two ends of the sample-making mold 30, and the elastic film 40 is fixed by the second tightening members 70.
The sleeve 20 is sleeved on the sample preparation mold 30, and the height of the upper edge of the sleeve 20 is higher than that of the upper edge of the sample preparation mold 30.
The compacting rod 10 includes an upper platen, a lower platen and a connecting rod, the two ends of the connecting rod are respectively connected with the upper platen and the lower platen, and the distance between the lower end face of the lower platen and the lower end face of the upper platen is equal to the height of the sample preparation mold 30. The diameter of the lower end face of the lower pressure plate is equal to the diameter of the section of the soil sample.
A special soil sampling device was used as follows:
1. fixing the die pad 50 on the base 90, and screwing the screw of the connecting lug;
2. coating vaseline on the splicing position of the sample preparation mold 30 to improve air tightness, splicing the sample preparation mold 30, and fixing by using a first clamping piece 60;
3. the elastic film 40 penetrates through the sample making mold 30, then the two ends of the elastic film are turned up and sleeved on the sample making mold 30, and then the two second tightening pieces 70 are sleeved at the two ends of the sample making mold 30;
4. coating vaseline on the inner side of the elastic membrane 40, reducing the friction between the soil and the elastic membrane 40, and placing the sample preparation mould 30 on a mould pad 50;
5. a rubber tube is connected to the air extraction joint 80 on the sample preparation mold 30, and air between the sample preparation mold 30 and the elastic membrane 40 is sucked out by an ear washing ball or a vacuum pump to ensure that the two are tightly attached;
6. placing the compaction rod 10 in an empty sample preparation mold 30, setting 0.5N axial force by adopting stress control of a triaxial test device, enabling a loading head of the triaxial test device to be in contact with the upper end of the compaction rod 10, recording initial displacement displayed on the triaxial test device at the moment, and separating the loading head from the compaction rod 10;
7. sequentially filling a permeable stone and a piece of filter paper into the sample preparation mold 30, then filling the equant soil sample (five layers or three layers are determined according to the specific requirements of the experiment), horizontally placing the compaction rod 10 on the soil sample, setting the equant displacement increment based on the initial displacement recorded in the step 6, and compacting the soil sample to the specified height by using a triaxial test device at a certain speed set by strain control;
8. after one layer of soil sample is compacted, controlling the loading head to be separated from the compaction rod 10 and taking out the compaction rod 10, roughening the surface of the soil sample, then loading a second layer of soil sample, and so on, and placing the sleeve 20 on the sample preparation mold 30 when the last layer of soil sample is added to prevent the soil sample from scattering and overflowing;
9. after the last layer is compacted, the compacting rod 10 and the sleeve 20 are firstly removed, and a piece of filter paper and a piece of permeable stone are successively placed on the soil sample;
10. after the soil sample is installed, installing a pressure chamber cover, closing all valves of the triaxial test equipment, and connecting a vacuum pump at an air outlet to perform air extraction; when the air extraction time reaches the standard, the surrounding pressure valve is opened to slowly inject clear water, and the vacuum degree is kept stable. Stopping air suction after the soil sample is completely immersed in water, and releasing the vacuum of the pressure chamber;
11. after saturation, opening a surrounding pressure valve for draining water, removing a pressure chamber cover, placing a top cap of the triaxial test equipment on the permeable stone, turning the upper end of the elastic membrane 40 to be sleeved on the top cap, and sleeving a second tightening piece 70 above the elastic membrane 40 on the turned elastic membrane;
12. detaching the die pad 50, turning down the lower end of the elastic membrane 40 and sleeving the lower end of the elastic membrane on a base 90 of the triaxial test equipment, and sleeving the second tightening piece 70 at the lower part on the turned down elastic membrane 40;
13. the first tightening member 60 is loosened to remove the sampling die 30 from both sides, and the sampling is completed.
According to the special soil sampling device of the embodiment of the application, at least the following functions can be realized by adopting the design: the sample preparation die 30 is heightened through the die cushion 50, the upper end and the lower end of the elastic film 40 are sleeved on the sample preparation die 30, so that the sealing effect between the elastic film 40 and the sample preparation die is improved, the laminating effect between the elastic film 40 and the sample preparation die is further improved, and the special soil sample preparation device can reduce disturbance during soil sample preparation.
In the description herein, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the application, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A special soil sampling device, comprising:
the sample preparation device comprises a sample preparation mold, a gas extraction connector and a gas extraction pipe, wherein the upper end and the lower end of the sample preparation mold are opened, the outer side wall of the sample preparation mold is provided with the gas extraction connector, and the gas extraction connector is communicated with an inner cavity of the sample preparation mold;
the elastic membrane is arranged in the inner cavity of the sample preparation mold, and two ends of the elastic membrane respectively extend to the upper end and the lower end of the sample preparation mold and are sleeved on the outer side wall of the sample preparation mold;
and the template pad is arranged on the template pad and is higher than the template making die.
2. The special soil sampling device according to claim 1, wherein: the sample preparation mold comprises a plurality of mold sheets, wherein the mold sheets are connected end to end, and a sealing structure is arranged at the joint position of every two adjacent mold sheets.
3. The special soil sampling device according to claim 2, wherein: the sealing structure includes at least one of a sealing strip and a sealant.
4. The special soil sampling device according to claim 2, wherein: the special soil system appearance device includes first retaining member, first retaining member cover is established on the lateral wall of system appearance mould, first retaining member is spacing each the diaphragm, first retaining member includes at least one of clamp, larynx hoop.
5. The special soil sampling device according to claim 1, wherein: the special soil sample preparation device comprises a second tightening piece, the second tightening piece is sleeved at two ends of the sample preparation mold respectively, the second tightening piece is fixed with the elastic membrane, and the second tightening piece comprises at least one of a binding band and a rubber ring.
6. The special soil sampling device according to claim 1, wherein: the die pad comprises a backing ring, the backing ring is used for being sleeved on a base of the triaxial test equipment, and the height of the backing ring is lower than that of the base.
7. The special soil sampling device according to claim 6, wherein: the backing ring comprises a plurality of ring pieces, each ring piece is connected end to end, each ring piece comprises a connecting lug, and the connecting lugs of two adjacent ring pieces are mutually butted.
8. The special soil sampling device according to claim 1, wherein: the special soil sample preparation device comprises a sleeve, the sleeve is sleeved on the sample preparation mold, the height of the upper edge of the sleeve is higher than that of the upper edge of the sample preparation mold, and the height of the lower edge of the sleeve is lower than that of the upper edge of the sample preparation mold.
9. The special soil sampling device according to claim 1, wherein: the special soil sample preparation device comprises a compaction rod, the height of the compaction rod is larger than or equal to that of the sample preparation mold, and the diameter of the lower end face of the compaction rod is equal to that of the cross section of the soil sample.
10. The special soil sampling device according to claim 9, wherein: the compaction pole includes pressure disk, lower pressure disk and connecting rod, the both ends of connecting rod are connected respectively go up the pressure disk with down the pressure disk, down the pressure disk down the terminal surface with the distance between the lower terminal surface of last pressure disk equals the height of system appearance mould.
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| CN202221116720.0U CN217586560U (en) | 2022-05-10 | 2022-05-10 | Special soil sample preparation device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221116720.0U CN217586560U (en) | 2022-05-10 | 2022-05-10 | Special soil sample preparation device |
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| CN217586560U true CN217586560U (en) | 2022-10-14 |
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| CN202221116720.0U Active CN217586560U (en) | 2022-05-10 | 2022-05-10 | Special soil sample preparation device |
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