CN202974740U - Preparation device of silt triaxial test sample - Google Patents
Preparation device of silt triaxial test sample Download PDFInfo
- Publication number
- CN202974740U CN202974740U CN 201220680418 CN201220680418U CN202974740U CN 202974740 U CN202974740 U CN 202974740U CN 201220680418 CN201220680418 CN 201220680418 CN 201220680418 U CN201220680418 U CN 201220680418U CN 202974740 U CN202974740 U CN 202974740U
- Authority
- CN
- China
- Prior art keywords
- base
- sample
- upper cap
- water valve
- water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 53
- 238000006073 displacement reaction Methods 0.000 claims abstract description 8
- 239000012528 membrane Substances 0.000 claims description 14
- 241001474791 Proboscis Species 0.000 claims description 4
- 239000002689 soil Substances 0.000 abstract description 27
- 238000000034 method Methods 0.000 abstract description 7
- 238000007596 consolidation process Methods 0.000 description 10
- 238000003756 stirring Methods 0.000 description 9
- 239000012153 distilled water Substances 0.000 description 7
- 239000004033 plastic Substances 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 239000004927 clay Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000033458 reproduction Effects 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000002498 deadly effect Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 230000002335 preservative effect Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
Images
Landscapes
- Sampling And Sample Adjustment (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
本实用新型公开了一种粉土三轴试验试样的制备装置。对开圆模（6）和PVC管（7）套装有橡皮膜（4），对开圆模（6）下端设有底座（1），PVC管（7）上设有上帽（13），底座（1）和上帽（13）的设有透水板和滤纸，压力室内支架（15）上端设有压力杆（16）、死载（18）和轴向位移表（17），底座（1）设有底座水阀（9），上帽（13）设有上帽水阀（20），一个真空负压器与所述的底座水阀（9）和所述的上帽水阀（20）通过水管（26）连接，还包括一个长嘴漏斗（8）。本实用新型专利操作简单，技术方法易于掌握；土样内部均匀性比较好，土样之间重现度高，可以较高程度地再现自然界土层的微观结构，不需切割土样，减少扰动，试验结果可信度高。
The utility model discloses a preparation device for a silt triaxial test sample. The split round die (6) and the PVC pipe (7) are set with a rubber film (4), the lower end of the split round die (6) is provided with a base (1), and the PVC pipe (7) is provided with an upper cap (13), The base (1) and the upper cap (13) are provided with a permeable plate and filter paper, the upper end of the bracket (15) in the pressure chamber is provided with a pressure rod (16), a dead load (18) and an axial displacement gauge (17), the base (1 ) is provided with a base water valve (9), the upper cap (13) is provided with an upper cap water valve (20), a vacuum negative pressure device is connected with the base water valve (9) and the upper cap water valve (20 ) is connected by water pipe (26) and also includes a long-mouthed funnel (8). The utility model patent is easy to operate, and the technical method is easy to master; the internal uniformity of the soil sample is relatively good, and the reproducibility of the soil samples is high, which can reproduce the microstructure of the natural soil layer to a high degree, without cutting the soil sample, reducing disturbance , the test results are highly reliable.
Description
Technical field
The utility model relates to the mud mixing device of a kind of triaxial test (quiet three axles and moving three axles) sample used.
Background technology
Silt distributes wide in China, wherein take loess as the typical case, the loess area accounts for 6.3% of area.In order to study the mechanics of silt, triaxial test is a kind of common technological means.Usually can adopt the densification method to prepare sand disturbance sample, and clay sample has benefited from its viscosity, adopt undisturbed soil to be easy to realize.As a kind of soil between sand and clay, if prepare sample according to the method for sand or clay simply, the micromechanism that makes sample is different from on-the-spot actual conditions significantly, cause test findings to be different from largely on-site actual situations.Silt has certain viscosity, but cohesive force is not high, is not enough to resist the destruction in non-disturbed sample preparation process, has caused like this difficulty of silt sample preparation, has hindered the research of silt.In order to carry out better the research of silt mechanical characteristic, prepare reliable sample and seem very important.
The utility model content
Technical problem to be solved in the utility model is to provide a kind ofly can reappear soil microstructure, the mechanical behavior of soil is more near truth, and soil sample reproduction degree is high, reduces as much as possible otherness between sample to the preparation facilities of the silt triaxial test sample of the impact of test findings.
for the technical solution problem, the preparation facilities of the silt triaxial test sample that the utility model provides, split round mould upper end to being connected to pvc pipe, describedly split round mould and described pvc pipe is set with rubber membrane, the described round mould lower end of splitting is provided with base and the first rubber band, described pvc pipe is provided with cap and the second rubber band, described base top is provided with the first porous disc and the first filter paper successively, the below of described upper cap is provided with the second porous disc and the second filter paper successively, described lower end of splitting round mould is arranged on the lower end of pressure chamber's inner support, inner support upper end, described pressure chamber is provided with press rods, dock with described upper cap the lower end of described press rods, described press rods upper end is provided with dead carrying, described pressure chamber inner support is provided with the axial displacement table that acts on described press rods, described base is provided with the base water valve, described upper cap is provided with the cap water valve, negative pressure of vacuum device and described base water valve be connected upper cap water valve and be connected by water pipe, also comprise a proboscis funnel.
Described negative pressure of vacuum device is provided with water storage chamber and hothouse, described water storage chamber by the first air valve be connected air valve and be connected with described water pipe respectively, described hothouse is connected with vacuum source by upper air valve.
Adopt the preparation facilities of the silt triaxial test sample of technique scheme, the preparation method of its silt triaxial test sample: add enough water in silt, making water cut is 1.5 times of liquid limit, then adopts transit mixer stirring at low speed soil sample, makes soil sample become stream to mould the mud of state; Mud is poured into to be placed on split on the triaxial apparatus base in round mould (two synthetic), splitting round mould inner sleeve has rubber membrane, permeable stone and filter paper; Allow mud precipitate under Gravitative Loads, non-volatile in order to guarantee upper water, with plastic sheeting, upper water is sealed; Add dead carrying on mud top, do not overflow in order to guarantee mud, slowly progressively load, after completing consolidation draining under current load, then add the next stage load until mud; Until mud top extremely carry complete under effect be consolidated into sample after, remove dead carrying, remove sample upper strata distilled water, with rubber membrane and rubber ring sealing sample; Due to sidewall friction, consolidation pressure is inhomogeneous from top to bottom, in order to improve the homogeneity of sample, connects negative pressure of vacuum, makes sample further fixed under negative pressure; Treat that sample completes fixedly under negative pressure, remove negative pressure and get final product.The low speed of transit mixer is 55 rev/mins～65 rev/mins.The value of negative pressure of vacuum is greater than the dead stress that causes that carries, less than the required consolidation pressure of triaxial test.Simple to operate, technological means is easy to grasp; Preparation sample equipment needed thereby is fairly simple, and required sample preparation cost is low; Adopt this scheme, the inner homogeneity of soil sample is relatively good, and soil sample experimental result reproductions degree under condition of the same race is high, and micromechanism that can higher degree ground reproduction nature soil layer does not need to cut soil sample, reduces disturbance, and test findings is with a high credibility.Therefore, the utility model patent is a kind of preparation facilities of silt triaxial test sample effectively reliably.
Description of drawings
Fig. 1 pours mud into by funnel the schematic diagram of splitting in round mould.
Fig. 2 is mud fixed schematic diagram under dead carrying.
Fig. 3 is mud fixed schematic diagram under negative pressure of vacuum.
in accompanying drawing 1-3: 1-base, the 2-the first porous disc, the 3-the first filter paper, 4-rubber membrane, the 5-the first rubber ring, 6-split round mould, 7-pvc pipe, 8-proboscis funnel, 9-base water valve, 10-mud, the 11-the second filter paper, the 12-the second porous disc, 13-upper cap, 14-distilled water, 15-pressure chamber inner support, 16-press rods, 17-axial displacement table, 18-dead carrying, the 19-the second rubber ring, 20-upper cap water valve, 21-water storage chamber, 22-hothouse, 23-upper air valve, the 24-the first air valve, the 25-the second air valve, 26-water pipe.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is elaborated.
The preparation method of the silt triaxial test sample that the utility model provides adds enough water in silt, making water cut is 1.5 times of liquid limit, then adopts transit mixer stirring at low speed soil sample, makes soil sample become stream to mould state; Mud is poured into to be placed on split on the triaxial apparatus base in round mould (two synthetic), splitting round mould inner sleeve has rubber membrane, permeable stone and filter paper; Allow soil sample precipitate under Gravitative Loads, non-volatile in order to guarantee upper water, with plastic sheeting, upper water is sealed; Add dead carrying on sample top, do not overflow in order to guarantee mud, slowly progressively load, after completing consolidation draining under current load, then add the next stage load until soil sample; Until soil sample top extremely carry complete under effect fixed after, remove dead carrying, remove sample upper strata distilled water, with rubber membrane and rubber ring sealing sample; Due to sidewall friction, consolidation pressure is inhomogeneous from top to bottom, in order to improve the homogeneity of sample, connects negative pressure of vacuum (its value is greater than the dead stress that causes that carries, less than the required consolidation pressure of triaxial test), makes sample further fixed under negative pressure; Treat that sample completes fixedly under negative pressure, can remove negative pressure, assembling triaxial test equipment carries out triaxial test.
referring to Fig. 1, Fig. 2 and Fig. 3, the structure of the preparation method's who realizes silt triaxial test sample that the utility model provides device is: split round mould 6 upper ends to being connected to pvc pipe 7, split round mould 6 and pvc pipe 7 and be set with rubber membrane 4, split round mould 6 lower ends and be provided with base 1 and the first rubber band 5, pvc pipe 7 is provided with cap 13 and the second rubber band 19, base 1 top is provided with the first porous disc 2 and the first filter paper 3 successively, the below of upper cap 13 is provided with the second porous disc 12 and the second filter paper 11 successively, the lower end of splitting round mould 6 is arranged on the lower end of pressure chamber's inner support 15, inner support 15 upper ends in pressure chamber's are provided with press rods 16, dock with upper cap 13 lower end of press rods 16, press rods 16 upper ends are provided with dead year 18, pressure chamber's inner support 15 is provided with the axial displacement table 17 that acts on press rods 16, base 1 is provided with base water valve 9, upper cap 13 is provided with cap water valve 20, base water valve 9 is connected with water pipe 26 respectively with upper cap water valve 20, the negative pressure of vacuum device is provided with water storage chamber 21 and hothouse 22, water storage chamber 21 by the first air valve 24 be connected air valve 25 and be connected with water pipe 26 respectively, hothouse 22 is connected with vacuum source by upper air valve 23, also comprise a proboscis funnel 8.
Referring to Fig. 1, Fig. 2 and Fig. 3, the utility model is realized by the following step in concrete enforcement:
The first step: choose 1000 gram silts, pour in the container of stirring machine, pour distilled water in soil sample, making the soil sample water cut is 1.5 times of liquid limit, adopts spatula to stir soil sample, makes it be in stream and moulds state;
Second step: for fear of moisture evaporation, the mixer container of soil sample is housed with the plastic paper sealing, and a standing night (approximately 10 hours), make soil particle fully absorb water.
The 3rd step: adopt the stirring machine with flat blade (can not produce a lot of bubbles in whipping process) to stir soil sample 15 minutes, for fear of causing too much bubble, answer low speed (55 rev/mins～65 rev/mins) to stir, soil sample is stirred becomes mud.
The 4th step: in the mud stirring process, be to put in order the first porous disc 2 and the first filter paper 3 (diameter is 71mm) well on the base 1 of 71mm at the triaxial apparatus pressure chamber diameter, packaging internal diameter outside base 1 is the rubber membrane 4 of 71mm, and with the first rubber band 5, rubber membrane 4 is entangled firm on base 1, avoid in the process of back the moisture in mud to ooze out from the base periphery.
The 5th step: round mould 6 is split in the interior diameter sample preparation that is 71mm entangled base 1, banding is split round mould 6.Rubber membrane 4 is trailed in splitting round mould 6 and at its top left-hand thread.In order to guarantee the specimen surface smooth degree, apply negative pressure of vacuum 90kPa (large as far as possible negative pressure) by the suction hole of splitting round mould 6, rubber membrane 4 is close to splits round mould 6 inwalls.
The 6th step: put the high-intensity pvc pipe 7 that the interior diameter that can remove stage makeup and costume is 71.5mm splitting round mould 6 tops, the height of pvc pipe 7 puts and can load mud after pvc pipe 7 and be as the criterion to split round mould 6.For fear of from pvc pipe 7 with split round mould 6 interface spillages and leak, before putting pvc pipe 7, coat the grease of a little at pvc pipe 7 interface inwalls.
The 7th step: treat that mud stirring is even, pouring it into cover by proboscis funnel 8 has in the round mould 6 of splitting of pvc pipe 7, (highly be the sample of 142mm in order to prepare until the precalculated position, need to be by repeatedly attempting obtaining this position, carry out mark), with plastic paper or preservative film capping pvc pipe 7, avoid moisture evaporation in mud 10.
The 8th step: (this time obtains by continuous trial to treat to precipitate 3 hours by mud 10 under Gravitative Loads, aim is the slurry that overflows when preventing from placing cap 13), then lightly the second filter paper 11, the second porous disc 12 and upper cap 13 are placed on together lightly mud 10 tops, and put a certain amount of distilled water 14 prevent mud 10 moisture evaporations on upper cap 13.Allow mud 10 draining 2 hours under the second porous disc 12 and upper cap 13 pressure.
The 9th step: triaxial apparatus pressure chamber inner support 15 is installed, press rods 16 is passed on the upper cap 13 that pressure chamber's top rail is placed on mud top, install axial displacement table 17 on press rods 16, record the mud vertical deformation, allow mud (comprise axial displacement meter weight) under press rods 16 weight and complete fixed (judging fixed whether completing according to vertical deformation-log time curve).
The tenth step: progressively increase on press rods 16 tops and deadly carry 18, until mud 10 complete for current dead year 18 times be consolidated into sample after (judging fixed whether completing according to vertical deformation-log time curve), add the next stage load, finally all vertical loads make the vertical fixed compressive stress in sample top approximately reach 30kPa again.
The 11 step: due to the friction between mud 10 and rubber membrane 4, vertical consolidation pressure can reduce from top to bottom, and the consolidation pressure inequality can cause sample density uneven.For uniform consolidation pressure is provided, removed vertical dead year 18, with the further fixed sample of negative pressure of vacuum-40kPa.Embodiment is as follows: progressively removed dead year 18, and avoided following sample is produced larger disturbance, removal pressure arm 15, press rods 16 and axial displacement meter 17; Absorb upward cap top layer distilled water 14 with needle tubing, then remove cap 13, the second porous disc 12 and the second filter paper 11; Wash down upper cap 13 and the second porous disc 12 with distilled water, then new the second filter paper 11 that soaked into and the second porous disc 12 and the upper cap 13 that washes down are placed on sample, put rubber membrane 4 and the second rubber band 19 with the sealing sample on upper cap 13; By water pipe 26, base water valve 9 and upper cap 13 are connected the negative pressure of vacuum device, the negative pressure of vacuum device comprises water storage chamber 21 and hothouse 22, the first air valve 24 and the second air valve 25 are arranged under water storage chamber, and negative pressure of vacuum enters the negative pressure of vacuum device by the upper air valve 23 on hothouse 22.Slowly add negative pressure to-40kPa, make sample simultaneously by sample upper and lower end discharging consolidation, record the fixed vertical deformation of sample, judge fixed whether completing according to vertical deformation-log time curve.
The 12 step: allow sample complete under negative pressure of vacuum fixed after, slowly reduce negative pressure to zero, then remove drainpipe and split round mould 6, at this moment sample prepares completely, the equipment such as assembling pressurization can carry out quiet three axles or moving triaxial test.
Adopt the standby sample of above mud sediment legal system, consuming timely from the beginning to the end be about 2 days.The utility model patent Introduction prepares diameter and is 71mm, highly is the sample of 142mm, and suitably conversion unit prepares other big or small samples, and the sample preparation principle is identical with step.
Claims (2)
1. the preparation facilities of a silt triaxial test sample, it is characterized in that: split round mould (6) upper end to being connected to pvc pipe (7), describedly split round mould (6) and described pvc pipe (7) is set with rubber membrane (4), described round mould (6) lower end of splitting is provided with base (1) and the first rubber band (5), described pvc pipe (7) is provided with cap (13) and the second rubber band (19), described base (1) top is provided with the first porous disc (2) and the first filter paper (3) successively, the below of described upper cap (13) is provided with the second porous disc (12) and the second filter paper (11) successively, described lower end of splitting round mould (6) is arranged on the lower end of pressure chamber's inner support (15), described pressure chamber inner support (15) upper end is provided with press rods (16), dock with described upper cap (13) lower end of described press rods (16), described press rods (16) upper end is provided with dead carry (18), described pressure chamber inner support (15) is provided with the axial displacement table (17) that acts on described press rods (16), described base (1) is provided with base water valve (9), described upper cap (13) is provided with cap water valve (20), negative pressure of vacuum device and described base water valve (9) be connected upper cap water valve (20) and be connected by water pipe (26), also comprise a proboscis funnel (8).
2. the preparation facilities of silt triaxial test sample according to claim 1, it is characterized in that: described negative pressure of vacuum device is provided with water storage chamber (21) and hothouse (22), described water storage chamber (21) is by the first air valve (24) and be connected air valve (25) and be connected with described water pipe (26) respectively, and described hothouse (22) passes through upper air valve (23) and is connected with vacuum source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220680418 CN202974740U (en) | 2012-12-11 | 2012-12-11 | Preparation device of silt triaxial test sample |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220680418 CN202974740U (en) | 2012-12-11 | 2012-12-11 | Preparation device of silt triaxial test sample |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202974740U true CN202974740U (en) | 2013-06-05 |
Family
ID=48515798
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220680418 Expired - Fee Related CN202974740U (en) | 2012-12-11 | 2012-12-11 | Preparation device of silt triaxial test sample |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202974740U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018085A (en) * | 2012-12-11 | 2013-04-03 | 中南大学 | Method and device for preparing silty soil triaxial-test test sample |
| CN104374625A (en) * | 2014-11-20 | 2015-02-25 | 中国人民解放军后勤工程学院 | Semi-automatic multifunctional soil test sample compaction device |
| CN104374624A (en) * | 2014-11-19 | 2015-02-25 | 北京工业大学 | Geotechnical triaxial test sample preparation split round mold and sample preparation method |
| CN114002029A (en) * | 2021-10-14 | 2022-02-01 | 华中科技大学 | Device and method for preparing sample from sandy soil outside instrument |
| WO2022135222A1 (en) * | 2020-12-25 | 2022-06-30 | 长安大学 | Device and method for preparing sandy soil sample using water method |
-
2012
- 2012-12-11 CN CN 201220680418 patent/CN202974740U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018085A (en) * | 2012-12-11 | 2013-04-03 | 中南大学 | Method and device for preparing silty soil triaxial-test test sample |
| CN104374624A (en) * | 2014-11-19 | 2015-02-25 | 北京工业大学 | Geotechnical triaxial test sample preparation split round mold and sample preparation method |
| CN104374625A (en) * | 2014-11-20 | 2015-02-25 | 中国人民解放军后勤工程学院 | Semi-automatic multifunctional soil test sample compaction device |
| CN104374625B (en) * | 2014-11-20 | 2018-07-31 | 中国人民解放军后勤工程学院 | A kind of semi-automatic multifunction soil test pressure-like device |
| WO2022135222A1 (en) * | 2020-12-25 | 2022-06-30 | 长安大学 | Device and method for preparing sandy soil sample using water method |
| CN114002029A (en) * | 2021-10-14 | 2022-02-01 | 华中科技大学 | Device and method for preparing sample from sandy soil outside instrument |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103018085A (en) | Method and device for preparing silty soil triaxial-test test sample | |
| CN202974740U (en) | Preparation device of silt triaxial test sample | |
| CN202814770U (en) | Remolded soil sample preparation device for triaxial shear test | |
| CN104777016B (en) | Slurry consolidation sample preparation equipment and use method thereof | |
| CN103389249B (en) | A kind of clay core wall Hydraulic fracturing test device and test method | |
| CN105784444B (en) | Indoor hollow cylinder reshaped clay sample compression preparation facilities and its method | |
| CN102095618A (en) | Device for preparing light-weight remoulded soil sample | |
| CN103411806B (en) | The method of operating of the unidirectional direct tensile test of a kind of cohesive soil and specialized equipment thereof | |
| CN106442259A (en) | Method and device for rapidly determining effective porosity of ecological porous concrete | |
| CN210719879U (en) | Test device for preparing rock-like transparent material by using vacuum consolidation method | |
| CN104122185B (en) | The compression of a kind of refuse soil and infiltration relation analyzer | |
| CN109323902A (en) | A kind of test device and test method for microbial cementation reinforcement of loess sample | |
| CN107860627B (en) | Stacked soil sample preparation device and application method thereof | |
| CN207263587U (en) | A kind of acid-base solution permeates saturation soil sample experimental rig | |
| CN206192737U (en) | Novel remolded soil system appearance device | |
| CN203881646U (en) | Simulation device for vertical migration of soil material | |
| CN205786036U (en) | A kind of transparent consolidation container of saturated manipulated soil | |
| CN108344544B (en) | Test device and method for measuring defect leakage quantity of composite geomembrane | |
| CN113552037A (en) | A device and method for testing seepage parameters of garbage dual porosity | |
| CN113702246B (en) | Monitoring device and monitoring method for pollutant migration in filling fracture network | |
| CN205483725U (en) | Remold saturated native water chemistry leaching test device | |
| CN204718922U (en) | Mud fluidity determinator | |
| CN204165806U (en) | A kind of equipment of indoor recovery undisturbed soil | |
| CN104614504B (en) | A kind of contaminated soil cured test method | |
| CN207502298U (en) | A kind of geomembrane tensile penetration test device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130605 Termination date: 20131211 |