CN207600815U - Dual compression preparation of soil sample device - Google Patents

Abstract

The utility model discloses a double compression soil sample preparation device, which comprises a double compression mechanism and a sample preparation barrel, the sample preparation barrel is arranged vertically and penetrates up and down, the double compression mechanism includes an upper compaction device and a lower compaction device, and the upper compaction device The device includes an upper adjustment rod installed on the upper end of the sample preparation barrel, an upper limit piece and an upper pressure piece. The upper pressure piece is movably sleeved in the sample preparation barrel. The part is installed on the upper adjusting rod in a way that the distance between the two can be adjusted. The lower compacting device includes the lower adjusting rod, the lower limiting part and the lower pressing part. The lower pressing part is tightly sleeved in the sample preparation barrel, and the lower limiting part is in the Below the lower pressing part, the lower limiting part and the lower pressing part are installed on the lower adjusting rod in a manner that the distance between them can be adjusted, and the lower adjusting rod is fixedly connected with the piston rod of the hydraulic device along the axial direction. By adopting the above structure, the uniformity of the soil sample can be increased.

Description

Double compression soil sample preparation device

technical field

The utility model relates to the field of earthworks, in particular to a double-compressed soil sample preparation device.

Background technique

In the construction of earthworks, the soil needs to be compacted to achieve the design compaction. The shear strength of the compacted soil is an important factor affecting the stability of the project. The indoor test is used to determine the reshaped soil. Strength is an indispensable and important link. Moreover, according to the National Geotechnical Test Regulations, the density of remolded soil samples needs to be strictly controlled to ensure the uniformity of parallel samples, the comparability and validity of experimental data.

The traditional preparation method of remolded soil samples adopts the layered compaction method. Because of the uncertainty of the relationship between the compaction number and the density of each layer of soil in this method, it is difficult to accurately control the uniformity of the soil sample. Based on this, the Chinese utility model patent with the application number 201410144259.3 titled "Multi-functional sample preparation device" and the Chinese utility model patent with the application number 201410363616.5 titled "Triaxial remodeling soil sample forming method and device" apply The Chinese utility model patent No. 201410476408.6 and titled "Controllable Density Geotechnical Triaxial Sample Maker" all record devices and methods for improving the uniformity of soil samples.

However, the above-mentioned devices all compress the soil sample from top to bottom, and mainly ensure the uniformity of the soil sample by controlling the compaction height of each layer of soil, although this method can improve the soil sample to a certain extent. However, due to the influence of friction between the soil sample and the mold, this method of single-weight compression of the soil sample cannot effectively solve the problem of uniformity of the soil sample.

Utility model content

The purpose of the utility model is to provide a dual-compression soil sample preparation device, which can more effectively solve the problem of soil sample uniformity.

For achieving the above object, the solution of the present utility model is:

A double compression soil sample preparation device, comprising a double compression mechanism and a sample preparation barrel for placing soil samples, the sample preparation barrel is vertically arranged and its upper and lower ports communicate with each other, and the double compression mechanism includes an upper compacting device and A lower compacting device, and the sample preparation barrel is between the upper compacting device and the lower compacting device, and the upper compacting device includes an upper adjustment device installed above the upper port of the sample preparation barrel Rod, the upper limit piece for blocking the sample preparation bucket and the upper pressure piece for blocking the soil sample in the sample preparation bucket, the upper pressure piece is used to be inserted into the upper end port of the sample preparation bucket In the sample preparation barrel, the upper limit member is above the upper pressing member, and the upper limiting member and the upper pressing member are installed on the upper adjusting member in a manner that the distance between them can be adjusted. On the rod, the lower compacting device includes a lower adjusting rod, a lower limiter for blocking the sample preparation bucket and a lower pressure member for blocking the soil sample in the sample preparation bucket, and the lower pressure member is tightly fitted Set in the sample preparation barrel, the lower limiting member is below the lower pressing member, and the lower limiting member and the lower pressing member are installed on the on the lower adjusting rod, and said lower adjusting rod is axially fixedly connected with a piston rod of a hydraulic device.

The preparation device also includes a reaction force frame mechanism, the reaction force frame mechanism is composed of the hydraulic device, two columns and a top beam connecting the two columns and a base, and the hydraulic device is vertically installed on the base superior.

The upper adjusting rod is an upper threaded rod, the lower adjusting rod is a lower threaded rod, the upper end of the upper screw rod is fixed on the top beam, and the upper limit member is provided with a screw threaded into the upper screw rod. The upper threaded hole on the top, the upper side of the upper pressure piece is concaved downwards and provided with an upper groove for the lower end of the upper screw to be fixed inside; the first end of the lower screw and the hydraulic device The piston rods are welded together, the lower screw rod and the piston rod are on the same axis, the lower limiter is provided with a lower threaded hole screwed into the lower screw rod, and the lower end of the lower pressure member faces inwardly concave There is a lower groove for fixing the upper end of the lower screw rod inside.

The upper limiter and the lower limiter are respectively fixed by fixing nuts, one of the fixing nuts is screwed into the upper screw rod and is above the upper limiter, and the other fixing nut is screwed into the upper limiter. on the lower screw rod and below the lower screw rod corresponding to the lower limiting member.

The upper compacting device also includes an upper porous plate that is compatible with the inside of the sample preparation barrel, and several vent holes are evenly opened on the upper porous plate, and the upper porous plate is sandwiched between the upper pressing Between the upper porous plate and the top surface of the soil sample, between the upper porous plate and the upper pressing piece and between the upper porous plate and the top surface of the soil sample, there are respectively fitted filter papers; The device also includes a lower perforated plate suitable for the inside of the sample preparation barrel, a number of vent holes are evenly opened on the lower perforated plate, and the lower perforated plate is sandwiched between the lower pressing member and the bottom surface of the soil sample between the lower porous plate and the lower pressing member and between the lower porous plate and the bottom surface of the soil sample are respectively sandwiched with suitable filter paper.

The double compression mechanism also includes two sets of measuring devices, both of which include a dial gauge and a magnetic gauge base, wherein the dial gauge of one set is installed on the top beam through the magnetic gauge base, And the measuring head of the dial indicator is in contact with the upper limit member; the other set of the dial indicator is installed on the column through the magnetic base, and the other set of the dial indicator The measuring head of the watch is in contact with the lower limit piece.

The sample preparation bucket is composed of several splicing plates and hoops, each of the splicing plates is spliced together to form a cylindrical shape, and the hoop is tightly hooped outside each of the cylindrical splicing plates.

The outer wall of the upper end of the sample preparation barrel and the outer wall of the lower end of the sample preparation barrel are respectively provided with ring-shaped reinforcing sleeves.

After adopting the above structure, the utility model has the following beneficial effects: the upper pressing part and the lower pressing part are respectively inserted into the two ends of the sample preparation barrel, and the lower pressing part follows the hydraulic device and moves along the axial direction in the sample preparation barrel , so that the top of the soil sample is subjected to the action of the upper pressing piece and the bottom of the soil sample is subjected to the action of the lower pressing piece, so that the soil sample is vertically compressed in the sample preparation barrel, so that the bottom surface and the top surface of the soil sample are double compressed, The influence of friction between the sample preparation bucket and the soil sample is reduced, thereby increasing the uniformity of the soil sample.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a partial cross-sectional view of the dual-compression soil sample preparation device of the present invention.

In the picture:

1-sample barrel 21-upper limit piece

22-upper pressing piece 23-upper screw

24-upper perforated plate 241-exhaust hole

25-filter paper 26-fixing nut

31-Lower limiter 32-Dresser

33-lower screw 34-lower perforated plate

35-fixing nut 41-hydraulic device

42-column 43-top beam

44-base 51-up dial indicator

52-upper magnetic base 53-lower dial indicator

54-Lower magnetic base 61-Arc plate

62-Hoop 63-Reinforcement sleeve

Detailed ways

In order to further explain the technical solution of the utility model, the utility model is described in detail through specific examples below.

The utility model is a dual compression soil sample preparation device, as shown in Fig. 1-2, comprising a dual compression mechanism, a hydraulic device and a sample preparation barrel 1.

The sample preparation barrel 1 is used to place soil samples; the double compression mechanism is used to push and compact the soil samples in the sample preparation barrel 1 from top to bottom and from bottom to top.

For convenience of description, the direction in normal use is taken as the reference direction of the present invention.

The sample preparation barrel 1 is vertically arranged, and the upper end port and the lower end port of the sample preparation barrel 1 are connected to each other; the double compression mechanism includes an upper compacting device and a lower compacting device, and when the sample preparation barrel 1 is in the upper compacting device and the lower compression device, Between the devices, and the upper compacting device, the sample preparation barrel 1 and the lower compacting device are on the same axis, the upper compacting device includes an upper adjustment rod, an upper limit member 21 and an upper pressure member 22, and the upper adjustment rod is installed on the Above the upper end port of the sample preparation barrel 1, and the upper limit member 21 is above the upper pressure member 22, the upper pressure member 22 can be inserted into the sample preparation barrel 1 from the upper end port of the sample preparation barrel 1, and the upper limit The position piece 21 and the upper pressure piece 22 are installed on the upper adjustment rod in a manner that the distance between the two can be adjusted; the upper limit piece 21 is used to block the upper end of the sample preparation barrel 1, and the upper pressure piece 22 is used to stop Soil samples in sample bucket 1. The lower compacting device comprises a lower adjusting rod, a lower limiting member 31 and a lower pressing member 32, the lower limiting member 31 is located below the lower pressing member 32, and the lower limiting member 31 and the lower pressing member 32 can adjust the distance between the two Installed on the lower adjustment rod, and the lower pressure piece 32 is inserted into the sample preparation bucket 1 from the lower end port of the sample preparation bucket 1, and closely fits with the inside of the sample preparation bucket 1, that is, the outer periphery of the lower pressure piece 32 is in contact with the sample preparation bucket 1. The inner side wall of the sample preparation barrel 1 fits closely, and the lower adjusting rod is fixedly connected with the piston rod of a hydraulic device in the axial direction; Block the soil sample in the sample preparation barrel 1, and cooperate with the upper pressing piece 22 to extrude the soil sample.

In the present utility model, the double-compressed soil sample preparation device also includes a reaction force frame mechanism, which is composed of the aforementioned hydraulic device 41, two columns 42, top beam 43 and base 44, and the top beam 43 and base 44 is installed between the two columns 42, the hydraulic device 41 is vertically installed on the base 44, and the piston rod of the hydraulic device 41 is on the same axis as the sample preparation barrel 1. In this embodiment, the hydraulic device 41 adopts a conventional hydraulic jack.

Specifically, both the upper adjusting rod and the lower adjusting rod are threaded rods, the upper adjusting rod is the upper threaded rod 23, the lower adjusting rod is the lower threaded rod 33, and the upper threaded rod 23 and the lower threaded rod 33 are all vertically arranged. The upper end portion of the screw rod 23 is installed on the top beam 43 by bolt connection, and the upper end portion of the upper screw rod 23 is in the middle position of the top beam 43; 1, in the present embodiment, the sample preparation bucket 1 is in the shape of a tube that penetrates up and down.

The upper limit member 21 is provided with an upper threaded hole for screwing into the upper screw rod 23, and the upper end of the upper pressure member 22 is concavely provided with an upper groove for the lower end of the upper screw rod 23 to be fixed inside. The screw rod 23 and the upper pressing piece 22 are fastened through the thread structure, that is, the inner side wall of the upper groove and the upper screw rod 23 are fastened through the threads that cooperate with each other, or can be fastened through a tight fit structure, that is, the upper groove's The length of the inner diameter is slightly less than or equal to the length of the outer diameter of the upper screw rod 23, so that there is a tight fit between the two, and the upper pressure piece 22 corresponds to the upper end port of the sample preparation barrel 1; The screw thread rotates and moves up and down to adjust the distance between the upper limit piece 21 and the upper pressure piece 22, and the upper screw rod 23 is also screwed with a fixed nut 26, and the fixed nut 26 is located above the upper limit piece 21. It is used to fix the upper limit member 21 , and screw the upper limit member 21 to a certain position of the upper screw rod 23 . Wherein, the outer diameter of the upper limit member 21 is longer than the outer diameter of the sample preparation barrel 1 , and the outer diameter of the upper pressing member 22 is slightly smaller than or equal to the inner diameter of the sample preparation barrel 1 .

The lower end of the lower screw rod 33 is welded to the piston rod of the aforementioned hydraulic device 41, and the lower screw rod 33 is on the same axis as the piston rod; , and the lower end of the lower pressure piece 32 is concaved upwards and is provided with a lower groove for the upper end of the lower screw 33 to be fixed inside, and the lower screw 33 and the lower pressure piece 32 are fastened by a threaded structure, that is, the lower groove The inner side wall and the lower screw rod 33 are fastened through the threads that cooperate with each other, and can also be fastened by a tight fit structure, that is, the inner diameter of the lower groove is slightly smaller than the outer diameter of the lower screw rod 33, so that the two can be tightened. and the lower pressure piece 32 corresponds to the lower end port of the sample preparation barrel 1; the lower limit piece 31 rotates along the screw thread of the lower screw rod 33 and moves up and down to adjust the distance between the lower limit piece 31 and the lower pressure piece 32 spacing, and the lower screw 33 is also screwed with a fixed nut 35, the fixed nut 35 is located below the lower limit piece 31, in order to fix the lower limit piece 31, and the lower limit piece 31 is screw-locked on a certain part of the lower screw rod 33. at a location. Wherein, the outer diameter of the lower limiting member 31 is longer than the outer diameter of the sample preparation barrel. Preferably, the upper screw 23, the sample preparation barrel 1 and the lower screw 33 are on the same axis.

Further, the double compression mechanism also includes two sets of measuring devices, both of which include a dial indicator and a magnetic gauge base, the first set of measuring devices is used to measure the position of the upper limit member 21 on the upper screw 23, the second set The measuring device is used to measure the position of the lower limiting member 31 on the lower screw rod 33 . The dial indicator in the first set of measuring devices is an upper dial indicator 51, and the magnetic gauge base is an upper magnetic gauge base 52, and this upper dial indicator 51 is a large-range digital display dial indicator, and the upper dial indicator 51 passes through the upper magnetic force. The table base 52 is installed on the top beam 43, and the measuring head of the upper dial indicator 51 is in contact with the upper limit member; the dial indicator in the second set of measuring devices is the lower dial indicator 53, and the magnetic table base is the lower magnetic gauge Seat 54, the lower dial indicator 53 is installed on one of the columns 42 through the lower magnetic meter seat 54, and the measuring head of the lower dial indicator 53 is in contact with the lower limiter 31. Wherein, when the upper limiter 21 is in close contact with the upper pressing member 22, the reading of the upper dial indicator is set to zero; when the lower limiting member 31 is in close contact with the lower pressing member 32, the reading of the lower dial indicator is set to zero. Preferably, the measuring head of the upper dial indicator 51 is perpendicular to the upper stop member 21, and the measuring head of the lower dial indicator 53 is perpendicular to the lower stop member 31, so as to ensure that the upper dial indicator 51 and the lower dial indicator 53 measure data is accurate.

Further, the upper compacting device also includes an upper perforated plate 24, which is sandwiched between the top surface of the soil sample and the upper pressing member 22, and the lower compacting device also includes a lower perforated plate 34, which is sandwiched by the lower perforated plate 34. Located between the bottom surface of the soil sample and the lower pressing member 32, the upper porous plate 24 and the lower porous plate 34 are used to fully discharge the air in the soil sample during the compaction process; the diameter of the upper porous plate 24 and the lower porous plate 34 The length is slightly less than the inner diameter of the sample preparation barrel 1, and the lower porous plate 34 and the upper porous plate 24 are evenly spaced with several vertical exhaust holes 341, 241, and each exhaust hole on the lower porous plate 34 Holes 341 are center-symmetrically distributed, and each exhaust hole 241 on the upper perforated plate 24 is center-symmetrically distributed; and, the lower end surface of the upper pressure piece 22 and the upper end surface of the lower pressure piece 32 are respectively provided with several grooves for To prevent the upper pressing piece 22 and the lower pressing piece 32 from obstructing the smooth discharge of air from the corresponding perforated plate, preferably, each groove of the upper pressing piece 22 and each groove of the lower pressing piece 32 are centrally symmetrical.

Further, filter paper 25 is sandwiched between the upper porous plate 24 and the upper pressing member 22 and between the lower porous plate 34 and the lower pressing member 32, and the filter paper 25 is compatible with the upper porous plate 24 and the lower porous plate 34 , to ensure that the air can be discharged smoothly during the compaction process of the soil sample. Preferably, the filter paper can also be sandwiched between the upper perforated plate 24 and the top surface of the soil sample and between the lower perforated plate 34 and the bottom surface of the soil sample to further ensure that the soil sample will not block the upper perforated plate during compaction. 24 and the exhaust holes of the lower perforated plate 34.

Further, the sample preparation barrel 1 is composed of several spliced plates and hoops, each spliced plate is spliced together to form a cylindrical shape, and the hoop 62 is tightly hooped outside each tubular spliced plate.

Specifically, each splicing plate is a circular arc plate 61, and each circular arc plate 61 is spliced with each other to form a circular cylinder, and the hoop 62 is tightly hooped outside the circular cylinder, and the hoop 62 is located in the middle of the circular cylinder. , in order to tighten each arc plate 61 so that it will not fall apart. Preferably, the outer wall of the upper end and the outer wall of the lower end of the sample preparation barrel 1 are respectively provided with ring-shaped reinforcing sleeves 63 to reinforce the circular arc plates 61 so that they will not fall apart. .

In this embodiment, the upper pressing part 22 is an upper pressing plate, and the lower pressing part 32 is a lower pressing plate.

Compared with the prior art, the upper pressing part 22 and the lower pressing part 32 are respectively inserted into the two ends of the sample preparation barrel 1, and the lower pressing part 32 moves along the axial direction in the sample preparation barrel 1 following the hydraulic device, The top of the soil sample is subjected to the effect of the upper pressing member 22 and the bottom of the soil sample is subjected to the effect of the lower pressing member 32, so that the soil sample is vertically compressed in the sample preparation barrel 1, so that the bottom surface and the top surface of the soil sample are double-pressed. The compression reduces the effect of friction between the sample preparation barrel 1 and the soil sample, thereby increasing the uniformity of the soil sample.

In addition, according to the sample preparation method of the dual compression soil sample preparation device of the foregoing embodiment, the following steps are provided:

(1), prepare the soil sample, calculate the wet soil quality m required for preparing the soil sample according to the volume V and density ρ of the designed sample, prepare the soil sample according to the required wet soil quality for calculation, and divide the soil sample by mass Divide into three equal parts;

(2), adjust the height of the lower limiter 31 so that the upper end surface of the lower limiter 31 and the lower end surface of the lower pressure member 32 are closely attached to each other, and the sample preparation barrel 1 is tightly sleeved outside the lower pressure member 32 in the axial direction, Its bottom end is located on the lower limiter 31, and then, in the sample preparation barrel 1, the first filter paper, the lower porous plate 34 and the second filter paper are sequentially stacked on the upper surface corresponding to the lower pressure member 32;

(3), after completing step (2), pour the three parts of soil samples in the step (1) into the sample preparation bucket 1 three times, and after each part of the soil sample is poured into the sample preparation bucket 1, the hydraulic device 41 is loaded , carry out preliminary compaction on the soil samples of each layer;

(4), in step (3), before each layer of soil sample is initially compacted, adjust the distance between the upper limiter 21 and the upper pressing member 22, so that after the hydraulic device 41 is loaded, the upper pressing member 22 can Contact the top surface of each layer of soil samples for preliminary compaction, and then shave the soil samples that have been preliminarily compacted before adding the next layer of soil samples. The soil sample to be compacted;

(5), in step (4), every time a part of soil sample is poured into, the top surface corresponding to every layer of soil sample in the sample preparation barrel 1 is successively stacked the third filter paper, the upper porous plate 24 and the fourth filter paper, After each layer of soil sample is initially compacted, the hydraulic device 41 is stopped, and then the filter paper, the upper porous plate 24 and another filter paper are taken away, and then they are laid on the top surface of the re-poured soil sample again. Reciprocating in this way, until the preliminary compaction of the third layer of soil samples is completed, the soil samples to be compacted can be obtained. At this time, the third filter paper, the upper porous plate 24 and the fourth filter paper are successively stacked on the top surface of the soil samples to be compacted. ;

(6), after step (5) is completed, adjust the height of the upper limit member 21 through the aforementioned upper dial indicator, so that the distance from the lower end of the upper limit member 21 to the lower end of the upper pressure member 22 is H ₁ =(Hh) /2-t, wherein, H is the height of the sample preparation barrel, t is the thickness of the upper porous plate, h is the height of the sample preparation, h=4m/ρπD ² , D is the inner diameter of the sample preparation barrel;

(7) After the adjustment is completed, let the hydraulic device 41 continue to load, the sample preparation barrel 1, the lower pressure piece 32 and the lower limit piece 31 move upward together with the lower adjustment rod, and the upper pressure piece 22 moves upward during the sample preparation barrel 1 enter the sample preparation barrel 1, and interact with the lower pressing member 32 to squeeze the soil sample to be compacted until the upper end of the sample preparation barrel 1 contacts the lower end of the upper limit member 21, and the hydraulic device 41 stops working, that is, The first step of compaction can be completed to form a semi-compacted soil sample;

(8), after the first step of compaction is completed, adjust the height of the lower limiter 31 through the aforementioned lower dial sub-meter, so that the distance between the upper end surface of the lower limiter 31 and the upper end surface of the lower pressure member 32 is : H ₂ =(Hh)/2-t ₂ , wherein, H is the height of the sample preparation barrel, t ₂ is the thickness of the lower perforated plate, h is the sample preparation height, h=4m/ρπD ² , D is the sample preparation barrel inner diameter;

(9), after step (7) is completed, make the hydraulic device 41 continue to load, and the lower pressing member 32 and the lower limiting member 31 continue to move upwards following the lower adjusting rod. The lower ends are in contact, so the sample preparation barrel 1 cannot continue to move upwards, so the lower pressure part 32 cannot continue to move upward together with the sample preparation barrel 1 because the sample preparation barrel 1 is blocked by the upper limit member 21, but is inside the sample preparation barrel 1 Move upward, and interact with the upper pressing member 22 to squeeze the semi-compacted soil sample during the movement in the sample preparation barrel 1 until the upper end surface of the lower limiter 31 contacts the bottom end of the sample preparation barrel 1, Then the hydraulic device 41 stops working, and the compaction of the soil sample is completed;

(10) After steps (1)-(9) are completed, unload the hydraulic device, remove and open the sample preparation barrel, take out the compacted soil sample, and the soil sample is completed.

Wherein, the upper adjusting rod is the upper threaded rod 23, and the lower adjusting rod is the lower threaded rod 33.

After adopting the sample preparation method of the above-mentioned double compression soil sample preparation device, the soil sample can be prepared according to the required height of the soil sample, and the soil sample is vertically compressed by the simultaneous action of the upper pressing part and the lower pressing part, which increases the uniformity of the soil sample, Moreover, the sample preparation steps are simple and accurate.

The above description is only a preferred embodiment of the present embodiment, and all equivalent changes and modifications made in accordance with the scope of the claims of the utility model shall belong to the scope of the claims of the utility model.

Claims (8)

1. a kind of dual compression preparation of soil sample device, it is characterised in that：System including dual compression mechanism and for placing soil sample Sample bucket, the sample preparation bucket is vertically arranged and its upper and lower port is mutually communicated, the dual compression mechanism include upper compaction apparatus and Lower compaction apparatus, and the sample preparation bucket is between the upper compaction apparatus and the lower compaction apparatus, the upper compaction apparatus Including be installed in the sample preparation bucket upper end port the upper adjusting rod of top, for stopping the upper limit part of the sample preparation bucket and use In the upper casting die for stopping soil sample in the sample preparation bucket, the upper casting die is used to be inserted in described from the upper end port of the sample preparation bucket In sample preparation bucket, the upper limit part is in the top of the upper casting die, and the upper limit part and the upper casting die are with adjustable The mode of spacing is installed on the upper adjusting rod between the two, and the lower compaction apparatus includes lower dolly bar, for stopping The lower limit part of sample preparation bucket and the pressing member for stopping soil sample in the sample preparation bucket are stated, the pressing member is closely sheathed on described In sample preparation bucket, the lower limit part is in the lower section of the pressing member, and the lower limit part and the pressing member are with adjustable The mode of spacing is installed on the lower dolly bar between the two, also, the piston rod of the lower dolly bar and a hydraulic device It is axially fixed connection.

2. dual compression preparation of soil sample device according to claim 1, it is characterised in that：The preparation facilities further includes instead Power frame mechanism, the counter-force frame mechanism are made of the hydraulic device, the top beam and pedestal of two columns of two root posts and connection, The hydraulic device is vertically installed on the pedestal.

3. dual compression preparation of soil sample device according to claim 2, it is characterised in that：The upper adjusting rod is upper screw thread Bar, the lower dolly bar are lower threaded rod, and the upper screw rod upper end end is fixedly arranged on the top beam, and the upper limit part opens up There is the upper screwed hole screwed on the upper screw rod, the upside of the upper casting die is recessed with downwards for the upper screw rod lower end It is fixedly arranged on interior upper groove；What the first end of the lower screw rod welded together with the piston rod of the hydraulic device, under described Screw rod is in the piston rod on same axis, and the lower limit part offers the lower threaded hole screwed on the lower screw rod, The lower face of the pressing member, which is concaved with, is fixedly arranged on interior lower groove for the lower screw rod upper end end.

4. dual compression preparation of soil sample device according to claim 3, it is characterised in that：The upper limit part and it is described under Locating part is fixed respectively by fixing nut, one of them described fixing nut is screwed on the upper screw rod and in described The top of upper limit part, another fixing nut screw on the lower screw rod and correspond to the lower limit in the lower screw rod The lower section of position part.

5. dual compression preparation of soil sample device according to claim 1, it is characterised in that：The upper compaction apparatus further includes The upper porous plate being adapted in the sample preparation bucket is uniformly provided with several gas vents on the upper porous plate, described more Orifice plate is located between the upper casting die and soil sample top surface, between the upper porous plate and the upper casting die and the upper porous plate It is folded with the filter paper being adapted respectively between soil sample top surface；The lower compaction apparatus is further included to be adapted in the sample preparation bucket Lower porous plate, be uniformly provided with several gas vents on the lower porous plate, the lower porous plate is located in the pressing member Between soil sample bottom surface, divide between the lower porous plate and the soil sample bottom surface between the lower porous plate and the pressing member It is not folded with the filter paper being adapted.

6. dual compression preparation of soil sample device according to claim 2, it is characterised in that：The dual compression mechanism is also wrapped Two sets of measuring devices are included, two sets of measuring devices include dial gauge and magnetic stand, wherein a set of dial gauge passes through institute It states magnetic stand to be installed on the top beam, and the measurement head of the dial gauge is in contact with the upper limit part；Another set of The dial gauge is installed in by the magnetic stand on the column, and the measurement head of the another set of dial gauge with it is described Lower limit part is in contact.

7. dual compression preparation of soil sample device according to claim 1, it is characterised in that：If the sample preparation bucket is spelled by dry plate Fishplate bar and cranse are formed, and each splice plate, which is stitched together, to be cylindrical in shape, and the cranse lock ring is in tubular each spelling Outside fishplate bar.

8. dual compression preparation of soil sample device according to claim 7, it is characterised in that：The upper end end of the sample preparation bucket Lateral wall and the sample preparation bucket lower end lateral wall respectively correspondence be arranged with rigidized cover annular in shape.