CN104949858A - Squeezing instrument - Google Patents
Squeezing instrument Download PDFInfo
- Publication number
- CN104949858A CN104949858A CN201510356989.4A CN201510356989A CN104949858A CN 104949858 A CN104949858 A CN 104949858A CN 201510356989 A CN201510356989 A CN 201510356989A CN 104949858 A CN104949858 A CN 104949858A
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- Prior art keywords
- plug
- piston
- barrel
- pressure
- soil
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- 239000002689 soil Substances 0.000 claims abstract description 52
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000011148 porous material Substances 0.000 claims abstract description 26
- 239000012528 membrane Substances 0.000 claims abstract description 8
- 238000006073 displacement reaction Methods 0.000 claims description 16
- 238000000605 extraction Methods 0.000 claims description 10
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 238000007599 discharging Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 238000007789 sealing Methods 0.000 description 4
- 238000009933 burial Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- -1 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000003809 water extraction Methods 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000011066 ex-situ storage Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Landscapes
- Sampling And Sample Adjustment (AREA)
Abstract
The invention provides a squeezing instrument which comprises a barrel body, a first plug and a second plug. One end of the barrel body is provided with the first plug, the other end of the barrel body is provided with the second plug, and a piston is arranged in the barrel body; an air inlet is formed in one side of the first plug and connected with a pressure source, and one end of the second plug is provided with a filter screen and a filter membrane. A soil sample is arranged between the piston and the second plug, stable pressure supplied by the pressure source is transmitted to the soil sample step by step through the piston to enable pore water of the soil sample to be evenly squeezed, and the extracting efficiency is improved; accordingly, the squeezing instrument solves the problems that when the soil pore water is extracted by a traditional squeezing instrument, the extracting cost is high, the consumption is large, a water sample is prone to being polluted, the free degree of pressurizing by an operator is small, and the security of sample discharging is low.
Description
Technical Field
The invention belongs to the technical field of soil chemical composition testing, and particularly relates to a squeezing instrument.
Background
The squeezing method is an effective ex-situ test method for extracting the pore water of the clay and is mainly realized by a squeezer.
The traditional squeezer collects pore water by transmitting the pressure provided by a pressure source to a soil sample through a piston, but has the following disadvantages: first, the value of the applied pressure cannot be set at will within the design pressure range; secondly, along with the increase of the use times, the top of the squeezer deforms due to stress, so that the pressure exerted from the upper part is different from the pressure actually received by the soil, and an error exists between the pressure theoretically received by the soil and the pressure actually received by the soil; thirdly, the upper limit of the pressure applied is less than 2.5MPa due to the volume limit of the balance weight which can be contained by the auxiliary equipment and the squeezer; fourthly, the soil sample is flushed out from bottom to top only by gas under the limitation of pressurization during sample unloading, and great potential safety hazard is caused. In addition, the existing squeezer can only be used for pressing water, has single function, and cannot meet the research on the problems of soil deformation and the like caused by stress application in the squeezing process.
Therefore, how to increase the range and adjustability of the pressure applied by the press and the stability of the use thereof to improve the accuracy of the pore water extraction process and the extraction efficiency of the pore water is a problem to be solved.
Disclosure of Invention
Aiming at the problems in the prior art, the embodiment of the invention provides a squeezing instrument, which is used for solving the technical problems of low extraction precision, low efficiency and high cost of a squeezer in the soil body pore water extraction process in the prior art.
The invention provides a squeezing instrument, which comprises:
the piston type water heater comprises a barrel, wherein a first plug is arranged at one end of the barrel, a second plug is arranged at the other end of the barrel, and a piston is arranged in the barrel;
the air inlet hole is formed in one side of the first plug and is connected with a pressure source;
one end of the second plug is provided with a filter screen and a filter membrane; wherein,
and a soil sample is arranged between the piston and the second plug, and stable pressure provided by the pressure source is transmitted to the soil sample through the piston step by step, so that pore water of the soil sample is uniformly squeezed, and the extraction efficiency is improved.
In the above scheme, the expression instrument further comprises: the first pressing cap is connected with one end of the barrel through threads.
In the above scheme, the expression instrument further comprises: and the second pressing cap is connected with the other end of the barrel through threads.
In the above scheme, the upper surface of the second plug is provided with crossed circular grooves.
In the above scheme, the expression instrument further comprises: and one end of the water guide pipe is connected with the lower surface of the second plug, and the other end of the water guide pipe is connected with the collection container.
In the above scheme, the expression instrument further comprises: a displacement rod, wherein the displacement rod is disposed in the cylinder, and one end of the displacement rod is connected with one end of the piston.
In the above scheme, the expression instrument further comprises: and the bracket is arranged at the other end of the displacement rod and used for placing a displacement sensor.
In the above scheme, the expression instrument further comprises: a base, wherein the base is connected with the second pressure cap through a screw.
In the above scheme, the filter screen is made of polytetrafluoroethylene.
In the above scheme, the expression instrument further comprises: and one end of the air tap is connected with the other end of the second plug and is used for fixing the water guide pipe.
The invention provides a squeezing instrument, which comprises: the piston type water heater comprises a barrel, wherein a first plug is arranged at one end of the barrel, a second plug is arranged at the other end of the barrel, and a piston is arranged in the barrel; the air inlet hole is formed in one side of the first plug and is connected with a pressure source; one end of the second plug is provided with a filter screen and a filter membrane; a soil sample is arranged between the piston and the second plug, and stable pressure provided by a pressure source is transmitted to the soil sample through the piston step by step, so that pore water of the soil sample is uniformly squeezed, and the extraction efficiency is improved; so, when traditional squeezer had been solved and has been extracted soil body pore water, the extraction cost is high, and the loss is big, and the water sample is easily polluted, the operator degree of freedom of exerting pressure is little and unload the appearance security low grade problem, and the water yield of collecting can satisfy the full analysis test demand.
Drawings
Fig. 1 is a schematic view of the overall structure of a squeezer provided in an embodiment of the present invention.
Detailed Description
In order to solve the problems that when a traditional squeezer is used for extracting soil body pore water, the extraction cost is high, the loss is large, a water sample is easy to pollute, the degree of freedom of pressing by an operator is small, the safety of sample unloading is low and the like, the invention provides a squeezer which comprises: the piston type water heater comprises a barrel, wherein a first plug is arranged at one end of the barrel, a second plug is arranged at the other end of the barrel, and a piston is arranged in the barrel; the air inlet hole is formed in one side of the first plug and is connected with a pressure source; one end of the second plug is provided with a filter screen and a filter membrane; and a soil sample is arranged between the piston and the second plug, and stable pressure provided by the pressure source is transmitted to the soil sample through the piston step by step, so that pore water of the soil sample is uniformly squeezed, and the extraction efficiency is improved.
The technical solution of the present invention is further described in detail by the accompanying drawings and the specific embodiments.
This embodiment provides a press, as shown in fig. 1, the press includes: the device comprises a cylinder body 1, a first plug 2, a second plug 3, a piston 4, a first pressing cap 5 and a second pressing cap 6; wherein,
one end of the barrel body 1 is provided with a first plug 2 and a first pressing cap 5, a first sealing ring 7 is further arranged between the first plug 2 and one end of the barrel body 1, and the first pressing cap 5 is connected with one end of the barrel body 1 through threads, so that the sealing performance of the upper portion of the barrel body 1 is guaranteed.
Here, an air inlet 8 is arranged on one side of the first plug 2, and the air inlet 8 is connected with a pressure source to provide pressure for the squeezer, wherein the sealed environment on the upper part of the barrel 1 ensures that the pressure provided by the pressure source can maintain stable and accurate pressure for a long time; the pressure source can be realized by a nitrogen gas tank or a helium gas tank to prevent the possible oxidation of air leakage caused by the tightness problem of the piston 4 in the squeezing process; and the pressure output by the pressure source is accurately controlled by a pressure reducing valve.
The other end of the barrel body 1 is provided with a second plug 3 and a second pressing cap 6, a second sealing ring 9 is further arranged between the second plug 3 and the other end of the barrel body 1, and the second pressing cap 6 is connected with the other end of the barrel body 1 through threads, so that the sealing performance of the lower portion of the barrel body 1 is guaranteed.
Here, the upper surface of second end cap 3 is provided with alternately circular slot, the one end of second end cap 3 is provided with filter screen and filtration membrane, the filter screen is carved by the polytetrafluoroethylene board and forms, the aperture of filter screen is 2mm, filtration membrane's aperture is 15 μm.
The expression appearance still includes: one end of the water guide pore channel is connected with the upper surface of the second plug 3 and penetrates through the second plug 3.
A piston 4 is arranged in the cylinder 1; one end of the piston 4 is provided with a first split ring, the other end of the piston 4 is provided with a second split ring, the first split ring and the second split ring can divide the cylinder body 1 into two independent parts, and the first split ring and the second split ring can be realized by an O-shaped ring.
Further, the presser further comprises: the device comprises an air tap 10, a water guide pipe 11, a base 12, a displacement rod 13 and a support 14; wherein,
one end of the air tap 10 is connected with the other end of the second plug 3 through a thread, and a metal body is further arranged on the water guide pipe 11 and used for assisting in fixing the position of the water guide pipe 11. The water guide pipe 11 penetrates through the air faucet 10 to be fixed in the air faucet 10; one end of the water guide pipe 11 is connected with the lower surface of the second plug 3 and then is precisely butted with the water guide pore channel, the other end of the water guide pipe 11 is connected with a collecting container, wherein the inner diameter of the water guide pipe 11 is 2mm, and the collecting container is provided with scales. The base 12 is connected with the second pressing cap 6 through screws and used for supporting the squeezer.
The displacement rod 13 is arranged in the barrel 1 and is vertical to the bottom of the squeezer, one end of the displacement rod 13 is connected with one end of the piston 4 through threads, and glue is coated at the position of the joint so as to ensure the stability of the long-term use of the squeezer. The bracket 14 is arranged at the other end of the displacement rod 13 and is used for placing a displacement sensor.
In practical application, a soil sample is placed between the piston 4 and the second plug 3, the output pressure of the pressure source is accurately controlled through the pressure reducing valve, stable pressure provided by the pressure source is transmitted to the soil sample through the piston 4, so that pore water of the soil sample is uniformly squeezed, and the pore water is filtered by the filter screen and the filter membrane and then is discharged to an external collecting container through the water guide pore channel and the water guide pipe 11.
The soil body sample can be cohesive soil, loose soil and silt soft soil, and the soil body sample is applied with pressure in a grading way, namely, first-stage pressure is applied to the soil body sample, and second-stage pressure is applied after the soil body is deformed stably, so that pore water can be uniformly squeezed from large pores to small pores, high pressure is prevented from being directly applied to the soil body sample, and then part of the pore water is sealed in the soil body sample.
Specifically, the pressure applied to the soil sample is determined according to the soil water content and the burial depth, and the pressure difference of each stage is increased from 0.2 MPa. For example, when the water content of the soil sample is 36.5% and the burial depth is 11m, the first-stage pressure is set to be 0.2Mpa, the pressure difference of each stage is gradually increased from 0.2Mpa to 0.4Mpa by the unit of 0.1Mpa, and then the pressure difference is constant.
For example, when the water content of the soil sample is 20.4% and the burial depth is 119m, the first-stage pressure is set to be 0.5Mpa, the pressure difference of each stage is gradually increased from 0.4Mpa to 0.8Mpa by the unit of 0.2Mpa, and then the pressure difference is constant.
In addition, when the soil sample is squeezed to extract pore water of the soil sample, deformation of the soil sample can change in the squeezing process, the deformation of the soil sample under the stress condition can be recorded through the displacement sensor, and reference data is provided for researching parameters of permeability coefficient of the soil sample, soil compression deformation of soil micro-pore structure change level under the grading action and the like.
The squeezer can accurately control the range and adjustability of applied pressure, not only solves the problems of high extraction cost, large loss, easy pollution of water samples, small degree of freedom for pressing by operators, low extraction precision, low sample unloading safety and the like when the traditional squeezer extracts water from soil pores, but also can record the deformation of soil samples in the process of extracting water from the pores, and provides reference data for researching various soil parameters.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements, etc. that are within the spirit and principle of the present invention should be included in the present invention.
Claims (10)
1. A press apparatus, comprising:
the piston type water heater comprises a barrel, wherein a first plug is arranged at one end of the barrel, a second plug is arranged at the other end of the barrel, and a piston is arranged in the barrel;
the air inlet hole is formed in one side of the first plug and is connected with a pressure source;
one end of the second plug is provided with a filter screen and a filter membrane; wherein,
and a soil sample is arranged between the piston and the second plug, and stable pressure provided by the pressure source is transmitted to the soil sample through the piston step by step, so that pore water of the soil sample is uniformly squeezed, and the extraction efficiency is improved.
2. The press apparatus of claim 1, further comprising: the first pressing cap is connected with one end of the barrel through threads.
3. The press apparatus of claim 1, further comprising: and the second pressing cap is connected with the other end of the barrel through threads.
4. The mill of claim 1 wherein the second plug upper surface is provided with intersecting circular grooves.
5. The expresser of claim 4, wherein said expresser further comprises: and one end of the water guide pipe is connected with the lower surface of the second plug, and the other end of the water guide pipe is connected with the collection container.
6. The press apparatus of claim 1, further comprising: a displacement rod, wherein the displacement rod is disposed in the cylinder, and one end of the displacement rod is connected with one end of the piston.
7. The press apparatus of claim 6, further comprising: and the bracket is arranged at the other end of the displacement rod and used for placing a displacement sensor.
8. The press apparatus of claim 3, further comprising: a base, wherein the base is connected with the second pressure cap through a screw.
9. The expresser of claim 1, wherein the filter screen is made of ptfe.
10. The press apparatus of claim 5, further comprising: and one end of the air tap is connected with the other end of the second plug and is used for fixing the water guide pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510356989.4A CN104949858A (en) | 2015-06-25 | 2015-06-25 | Squeezing instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510356989.4A CN104949858A (en) | 2015-06-25 | 2015-06-25 | Squeezing instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104949858A true CN104949858A (en) | 2015-09-30 |
Family
ID=54164685
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510356989.4A Pending CN104949858A (en) | 2015-06-25 | 2015-06-25 | Squeezing instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104949858A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106932248A (en) * | 2017-03-02 | 2017-07-07 | 中国地质大学（武汉） | Portable pore water pressure squeezes device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20090016071A (en) * | 2007-08-10 | 2009-02-13 | 광주과학기술원 | Extraction system for extracting of soil pore water |
| CN201859082U (en) * | 2010-11-16 | 2011-06-08 | 中国地质大学（武汉） | Piston-type clayey soil pore water mechanical squeezing instrument |
| CN102901805A (en) * | 2012-09-28 | 2013-01-30 | 中国地质大学（武汉） | Strain type double-faced drainage squeezing instrument for pore water of ground |
-
2015
- 2015-06-25 CN CN201510356989.4A patent/CN104949858A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20090016071A (en) * | 2007-08-10 | 2009-02-13 | 광주과학기술원 | Extraction system for extracting of soil pore water |
| CN201859082U (en) * | 2010-11-16 | 2011-06-08 | 中国地质大学（武汉） | Piston-type clayey soil pore water mechanical squeezing instrument |
| CN102901805A (en) * | 2012-09-28 | 2013-01-30 | 中国地质大学（武汉） | Strain type double-faced drainage squeezing instrument for pore water of ground |
Non-Patent Citations (4)
| Title |
|---|
| 李静等: "水化学揭示的弱透水层孔隙水演化特征及其古气候指示意义", 《地球科学-中国地质大学学报》 * |
| 杨会年等: "孔隙溶液试验研究方法", 《地质科学》 * |
| 汤鸣皋: ""气压、活塞式两用软泥压榨仪"简介", 《地质科技情报》 * |
| 赵智等: "同位素及水化学方法研究黏性土孔隙水的运动特征", 《科学技术与工程》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106932248A (en) * | 2017-03-02 | 2017-07-07 | 中国地质大学（武汉） | Portable pore water pressure squeezes device |
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| PB01 | Publication | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150930 |
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| RJ01 | Rejection of invention patent application after publication |