CN2145379Y - Experimental device for stake base static load - Google Patents
Experimental device for stake base static load Download PDFInfo
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- CN2145379Y CN2145379Y CN 92242367 CN92242367U CN2145379Y CN 2145379 Y CN2145379 Y CN 2145379Y CN 92242367 CN92242367 CN 92242367 CN 92242367 U CN92242367 U CN 92242367U CN 2145379 Y CN2145379 Y CN 2145379Y
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- pile foundation
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Abstract
The utility model comprises a jack, a vacuum pump and a plurality of firm containers whose upper ends are closed and lower ends are opened. When a test is carried out, the container is arranged on the ambient ground of the tested pile, and the opening end is sealed with the ground; the closed space formed together by the container and the ground is sucked by the vacuum pump, and the space forms vacuum. Then atmospheric pressure difference resultant force is generated between the upper surface and the lower surface of the top of the container; the resultant force is used as counter-force, and the tested pile is loaded by the jack. The anchor pile or carrying heavy article is not need for weight counterbalance, the cost for the experiment of stake base static load can be lowered, and the testing efficiency can be improved.
Description
The utility model relates to the device that in the civil engineering work pile foundation is carried out static load test.
Known dead load test on pile foundation method has accumulation load method and anchoring pile (counter-force stake) method, accumulation load method is by top, peg top a pile carrying platform to be set, on this platform, stack steel ingot or concrete ingot, apply static load with the tested post of jack pair that is arranged between stake top and the platform then.Because general a times (being generally 60～100 tons) that requires to reach its design bearing capacity to the load that is applied by peg.Therefore, said method needs a large amount of steel ingot or concrete ingot, and need employ large-scale lifting cargo carrier and spend a large amount of manpower and materials and carry out the carrying and the loading and unloading of above-mentioned weight.So this method is complicated operation not only, and the experimentation cost height, work efficiency is very low.The anchoring pile method is on by near the ground the peg anchoring pile (or anchoring body) to be set, with girder steel and each anchoring pile (or anchoring body) top attachment, then with being arranged at by the jack pair between peg portion and the girder steel by the peg imposed load, because specially anchoring pile being set need employ piling machinery, bury anchoring body underground and need heavy earthwork, expense is all very expensive, and can not reuse.Therefore, the method for less expensive be utilize with the stake that is close to by peg as counter-force stake test.But the shortcoming of this method is that with girder steel that the workload that adjacent studs connects is big, efficient is low, and, require to be subjected to bigger pulling capacity in the counter-force stake during owing to test, thereby can produce harmful effect these quality.
The purpose of this utility model, be that a kind of new dead load test on pile foundation device will be provided, it neither needs the weight preloading as loading counterweight, need not play anchoring pile (or anchoring body is set) yet or utilize adjacent studs as the counter-force stake, this installation weight is light, easy to operate, reusable, and be applicable to multiple ground.
Of the present utility model is to realize like this, make the container that several have sufficient intensity and rigidity, these container upper end sealings, the bottom is open, the mouth of pipe that has supplied gas to import and export on the wall, on the outside surface of container, be provided with coupling member, the exhaust pipe mouth of these containers be connected with the bleeding point of vacuum pump, and coupling member on each container and beam are linked.Between by peg top and beam, lifting jack is set.
When carrying out dead load test on pile foundation, said vesse is arranged on by on the ground around the peg, seal the air intake opening of each container, and with the lower end (open end) and ground face seal of each container; Make with the joining beam of each container by by the peg headroom, pushed up by peg and beam between lifting jack is set.Start vacuum pump then, the enclosure space that is made of jointly container and ground is bled by the exhausr port on each container.Therefore because each container lower end and ground face seal, above-mentioned enclosure space is isolated with atmosphere, so, when vacuum pump wherein after the air extraction, wherein will form vacuum, thereby between the upper and lower surface of each container top, produce atm difference.The direction directed towards ground that this pressure reduction is made a concerted effort, pressure difference is near 1 atmospheric value.This compresses said vesse with joint efforts earthward, makes it be anchored in ground.Because the coupling member on beam and each container links, therefore, above-mentionedly act on the beam by coupling member with joint efforts, make it can bear the counter-force that is equivalent to the atm difference force action power size that each container top bears and can upwards not be moved.Start lifting jack, it is upheld at beam and between by the peg top, because beam can not be moved upward by above-mentioned force action, thereby limited lifting jack and pushed up the stretching exercise upwards of raising the head, the reacting force that is produced by restriction acts on by the top of peg by lifting jack, thereby has realized by the loading of peg.
After test is finished, only need the air inlet mouth of pipe on the openable container, make air enter internal tank, just can realize unloading, because the container in the utility model is in order to constituting enclosure space with ground obtaining the atm difference anchor force, rather than with its deadweight as anchor force, therefore, these containers can be selected minimum weight satisfying under the condition of strength and stiffness.So the utility model device is compared with accumulation load method, weight significantly reduces, thereby has simplified test operation greatly; Because said apparatus all is not damaged after the process of the test neutralization test, therefore can reuse easily; Moreover, every can constitute with the ground of isolated from atmosphere with container in the utility model device all can use this device, and, because earth surface atmospheric pressure isotropy, this device also be applicable to different angles static test.Therefore, the utility model is applicable to multiple ground.
Container in the utility model can be made of steel, also can make of other sturdy material.Its section (xsect) shape can be circular, ellipse, rectangle or other geometric configuratioies; This container also should have enough height, can constitute enough spaces with ground with the assurance container inner wall, and make it can hold the water that ground is oozed out by vacuum action; The quantity of container and arrangement form can be determined according to field condition and testing requirements, also can and load limit typing according to test type and be provided with.
At the trial, the sealing on said vesse lower end and ground can be that the lower end of this container is directly imbedded in the soil, also can lay diaphragm seal on the container outer wall and on the ground around the container.Diaphragm seal can adopt plastic sheeting or other airtight and have certain intensity and toughness films.The sealing film should be on the outer wall that the skirt shape is enclosed in said vesse, and the lower edge of diaphragm seal should exceed the enough length of container lower edge, the part that contacts with container on the diaphragm seal should with this container outer surface fluid-tight engagement, as bonding, compress or real with hoop with soil pressure; The part that exceeds the container lower edge on the diaphragm seal is layed on the ground around the container, and imbeds in the soil or with soil and ground compacting.
Also a control system can be set in the utility model, this system is by vacuum transducer, and pressure passes formations such as device and regulating and controlling device.Vacuum transducer can be installed in container top or the vacuum pump system; Pressure transducer can be installed between stake top and the lifting jack bottom, also can be installed between lifting jack and the beam, if hydraulic jack, then pressure transducer also can be arranged in the jack hydraulic loop.The effect of vacuum transducer is detection and show in the container or the vacuum tightness that is reached in the vacuum system.The effect of pressure transducer then is detection and show the real load numerical value that jack pair stake top application adds.According to action-reaction law, the value of the maximum load that the jack pair stake can apply equates with the summation that the suffered atm difference of each container top is made a concerted effort, surpass this ultimate value, lifting jack will make each container be pulled up by ground, and destroy the sealing on each container and ground, thereby cause whole failure of apparatus.Therefore, loading that at the trial must strict control lifting jack makes it add the anchor force value that load value is not more than each container all the time and is produced.Because according to the cross-sectional area of the vacuum tightness in the container or in the vacuum system and each container, the anchor force that can directly try to achieve each container and produced.Therefore, at the trial, can control the loading of lifting jack according to the system vacuum degree that vacuum transducer spare detected and showed, this control procedure can be realized by operation manually, the automatic control and adjustment device also can be set finish automatically.
The lower end of the utility model container can be provided with the counterweight of constant weight, and this counterweight should be uniform with container center axis symmetry on end periphery under the container, and to guarantee to make this container its central axis under overhang be pedal line.
Device of air also can be placed in container of the present utility model top.
The effect of above-mentioned counterweight is in order to guarantee that this container is being dangled when hanging in the water, can be to the side overturning, so that air is discharged from the container.The effect of means of deflation is when the said vesse entry, emits the part air in this container, to reduce buoyancy, makes this container be sink to the bottom by vertical.
Owing to be provided with counterweight and means of deflation, make the utility model can be used for the pile foundation that is provided with on water-bed ground is carried out static test.
In the utility model, before the vacuum pump bleeding point air filter can be set, enter, influence the vacuum pump operate as normal to prevent dust.
Vacuum pump in the utility model can be the separate unit vacuum pump, also can be the vacuum pump unit that many vacuum pumps are formed.The form of vacuum pump can be a jetting pump, also can be oil-sealed rotary pump or other vacuum pumps.
Beam in the utility model can be made by steel, and the quantity of beam and arrangement form can be determined according to testing ground condition and testing requirements.
Coupling member in the utility model on the container connects with beam, can be rigidity, also can be flexible, on it length adjustment mechanism or tensioning system can be set.
The utility model is to utilize the internal tank with ground formation enclosure space is vacuumized, thereby makes the atm difference acting force that produces on this container as counter-force, is applied acting force by jack pair by peg.Compare with accumulation load method, can save a large amount of steel ingots and concrete ingot, and the required large-scale facility and the manpower and materials that will expend of these weights of handling and loading, thereby experimentation cost reduced significantly.Compare with anchoring pile method (or counter-force stake method), the utility model does not need to play anchoring pile (or anchoring body is set) near by peg, also need not to do the counter-force stake by adjacent studs, thereby not only can reduce the required expense of test, and exempt owing to use that the counter-force stake is done in contiguous stake the influence of these quality of pile.
Because container constitutes the ground of positiver sealing in every ability the utility model, all can use the utility model to carry out dead load test on pile foundation, therefore, the utility model can be used for multiple ground, as mud, soft ground even water-bed ground since atmospheric pressure the recipient is not to influence, so the utility model also can be used for static load test is carried out in the stake of different angles, these characteristics are that accumulation load method and anchoring pile method do not possess or difficult the realization.
The concrete structure of concrete working condition of the present utility model and device is provided by following examples and accompanying drawing thereof.
Fig. 1 is according to the structure of a kind of dead load test on pile foundation device that the utility model proposes and work synoptic diagram.
(1) is the container by welded steel plate among the figure, its upper end closed, the bottom is open, and the exhaust pipe mouth (17) and the air inlet mouth of pipe (16) are arranged on the wall, through stop valve (19), air filter (8) links to each other with the bleeding point of vacuum pump (4) exhaust pipe mouth (17) by pipeline (9).Stop valve (18) is housed, the vacuum meter (21) that coupling member (10) is housed and communicates at container (1) top on the air inlet mouth of pipe (16) with internal tank.
Container (1) is distributed in by on peg (5) ground (2) on every side, and the quantity of container (1) is desired by test, and maximum load is determined.The openend of each container is imbedded in the ground (2), made container (1) and ground (2) constitute enclosure space (3) jointly.Utilize the coupling arrangement (11) will be by being linked to each other with each container (1) top attachment member (10) by the beam (6) of peg (5) headroom.Between by peg (5) top and beam (6) bottom surface, a lifting jack (7) is set.As the lifting jack insufficient height, also can increase cushion block (20), between lifting jack and cushion block (20), pressure transducer (22) is set.
Start vacuum pump (4), to bleeding in the enclosure space (3), because container (1) lower edge is embedded in the ground (2), therefore make space (3) and isolated from atmosphere, so, along with the work of vacuum pump (4), to form vacuum gradually in the space (3), thereby between the upper and lower surface of container (1) top, form atm difference, this pressure reduction resultant direction directed towards ground, size equals the product of container (1) effective bearing area and pressure difference.
When the reading of vacuum meter (21) reach requirement and keep stable after, start lifting jack (7), its edge between by peg (5) top and beam (6) bottom surface is upheld by the peg axis direction.Because being subjected to the effect of container (1) on the beam (6) can not move upward, thereby limited lifting jack (7) and pushed up moving upward of raising the head, the counter-force that is produced by restriction is delivered to by the top of peg (5) through lifting jack (7), has realized by the loading of peg.
Observe the demonstration reading of pressure transducer (22), and show the loading of reading control lifting jack (7), guarantee that the load value that lifting jack is applied is not more than the value of the anchor force of trying to achieve according to vacuum meter (21) reading and container (1) cross-sectional area according to this.
After test is finished, close vacuum pump (4) and lifting jack (7), open stop valve (18), make air enter space (3).This moment, container (1) top upper and lower surface air pressure equated, pressure reduction is zero.Therefore, can easily pull up by ground.Because test back container (1) is not damaged, and therefore, can reuse.
Fig. 2 is a kind of theory diagram of controlling automatically according to realization operation in the dead load test on pile foundation device that the utility model proposes." vacuum system " that (A) representative is made of container (1) and vacuum pump (4) among the figure, (a) be vacuum transducer, (B) representative (b) is the load pressure sensor by " loading system " that lifting jack and propulsion system thereof constitute, (C) is the vacuum pump control device, (D) be the loading system control device, (E) being that fault is judged warning device, (F) being the loaded and displayed device, (G) is the vacuum system pick-up unit, (H) being the fault discriminating gear, (J) is to load pick-up unit." Yes " table is affirmed among the figure, and " No " table is negative, and " ON " shows power-on command, and " OFF " shows shutdown command." V " expression sensor (a) detects the vacuum tightness that obtains from (A), " Q " anchor force for trying to achieve according to V and used container (1) basal area, " n " is safety coefficient, " p " is predefined loaded value, T be sensor (b) by (B) record add the actual value of load, " t " is the actual on time of vacuum pump (4), " t ' " be under the normal condition, (A) system reaches the needed time of Q value.The interior each several part of frame of broken lines constitutes " complex control system " jointly among Fig. 2.
The course of work of principle shown in Figure 2 is as follows, after starting vacuum pump, (a) record the V value in (A), and be entered into and be converted into the Q value in (G) and predefined anchor force value compares, as measured value less than setting value, then enter into (H) and carry out fault judgement, as t≤t ', think that then system works is normal, at this moment (H) output power-on command, work on through (C) control (A), until Q=np; Otherwise, if t＞t ' thinks then to have fault in (A) system that as leaking, (H) provides fault-signal (E) at this moment, simultaneously (C) sent shutdown command.
Behind Q=np, (G) (C) sent shutdown command, the vacuum pump in (A) system is temporarily shut down, with energy savings; As after a period of time, (A) vacuum tightness descends in the system, and then control system repeats above-mentioned working cycle, and (A) started shooting again, sets the Q value to keep.
When Q=np; (G) simultaneously (J) sent power-on command; lifting jack in system's this moment (B) begins being loaded by peg; sensor (b) detect actual loaded value T; and it is sent into (J) if when comparing T=P with setting value P; (J) (D) sent halt command, the lifting jack in (B) is shut down, provide by (F) simultaneously and load the signal that reaches setting value.
Above-mentioned automatic control system can be realized by mechanical hook-up, also can adopt logic digital circuits and micro-computer technology to realize the automatic production record that also can be provided with in said system.
Adopt automatic control system, can realize accurate control on the one hand, reduce the interference of human factor test to the device course of work; On the other hand, can be according to required loading rank initialization system running parameter, remove unnecessary waste thereby tremble, energy savings, moreover automatic control system can the effective coordination vacuum system and the work of loading system, prevents that the overload accident from taking place.
Situation when the device that is basis the utility model proposes shown in Figure 3 is applied to the hard place surface.Because surface soil layer is harder, container (1) lower end is buried difficulty underground, therefore adopts the sealing embrane method to seal.(25) are diaphragm seals among the figure, as plastic sheeting, film (25) is locked on the shell ring outside surface of container (1) bottom with hoop (23), the remainder of film (25) is sprawled on the ground, use backfill soil (24) with film (25) and ground (2) and container (1) outer wall compacting then, this moment since film (25) and container (1) barrel and ground (2) fit tightly, thereby at container (1) lower edge and contact position, ground (2) formation positiver sealing.
Shown in Figure 4 is the situation that is applied to water-bed ground according to the dead load test on pile foundation device that the utility model proposes.
The bottom of container (1) has increased counterweight (26) among the figure (4), has set up an air release (27) on the pump-line (9) of container (1), has set up a pumping hole valve (28) at the bleeding point place of vacuum pump (4).
During operation, close gas admittance valve (18) earlier, air release (27), pumping hole valve (28) is opened vent valve (19), and container (1) is dangled hangs in the water then, because the deadweight effect, this container is to sedimentation under water.Because the common formation of this moment container (1) inwall and water surface one enclosure space, the inner air of container (1) can not be discharged.Therefore, along with the sedimentation of container (1), its inner air is compressed gradually, and produces the reacting force that opposing container (1) continues sedimentation.This acting force might make container (1) overturning, thereby the air in it is overflowed.Counterweight (2) has increased container (1) bottom weight and container gross weight, thereby has suppressed the overturning campaign of container (1).If water is darker, when container (1) when being settled down to certain depth of water, the air pressure in it may be dead-weight balanced with container (1), makes this container can not continue sedimentation.At this moment, can slowly open air release (27), the discharge section air makes container (1) can be settled down to water-bed ground.After container (1) arrives water-bed ground, can apply certain downward acting force at this container top, make container (1) lower edge insert water-bed ground, form sealing to container (1) inner space (3).Start vacuum pump (4), the air in space (3) is extracted out.Because container (1) lower edge inserts water-bed ground, constitute sealing with ground, make the outside water of container (1) can not enter this container, so, after starting vacuum pump (4), to form vacuum gradually in the space (3), thereby make container (1) top produce the anchor force that forms by atm difference and head pressure reduction.Scheme among (3), figure (4) embodiment identical with figure (1) embodiment by the loading procedure of peg.
Claims (6)
1, a kind of dead load test on pile foundation device, include lifting jack (7), beam (6), lifting jack (7) is arranged on by between the top of peg (5) and the beam (6), this device is characterised in that several have the container of sufficient intensity and rigidity (1), this container upper end sealing, the bottom is open, the mouth of pipe that the supplied gas turnover is arranged on the wall, the outside surface of container (1) is provided with connection member (10), the exhaust pipe mouth of this container (17) is connected with the bleeding point of vacuum pump (4), and coupling member (10) links with beam (6).
2,, it is characterized in that container (1) bottom can be provided with counterweight (26), also can be provided with an air release (27) on this vessel exhaust pipe road according to the described dead load test on pile foundation device of claim 1.
3,, it is characterized in that being provided with air filter (8) before the bleeding point of vacuum pump (4) according to claim 1 or 2 described dead load test on pile foundation devices.
4, according to claim 1 or 3 described dead load test on pile foundation devices, it is characterized in that also can comprising complex control system in this device that this system includes the vacuum system pick-up unit, loading system pick-up unit, device for discriminating failure.
5,, it is characterized in that also can comprising in this device vacuum pump control device and loading system control device according to claim 1 or 4 described dead load test on pile foundation devices.
6, according to the described dead load test on pile foundation device of claim 1, it is characterized in that to be provided with diaphragm seal (25) on the outer wall of container (1), the sealing film is the skirt shape and is enclosed on container (1) outer wall, its lower edge exceeds the enough length of container (1) lower edge, part that contacts with container (1) on the sealing film and container (1) appearance fluid-tight engagement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92242367 CN2145379Y (en) | 1992-11-26 | 1992-11-26 | Experimental device for stake base static load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92242367 CN2145379Y (en) | 1992-11-26 | 1992-11-26 | Experimental device for stake base static load |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2145379Y true CN2145379Y (en) | 1993-11-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92242367 Expired - Lifetime CN2145379Y (en) | 1992-11-26 | 1992-11-26 | Experimental device for stake base static load |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2145379Y (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100453999C (en) * | 2007-07-31 | 2009-01-21 | 中铁二局股份有限公司 | 32m/900t prestressed concrete pretension box beam static loading test method |
| CN101413274B (en) * | 2008-11-26 | 2010-06-09 | 李道华 | Upper-stacking and lower-hanging combined load static load test pile apparatus |
| CN102051890A (en) * | 2010-11-23 | 2011-05-11 | 淮安市中涟工程机械制造有限公司 | Detection vehicle for static load test of single pile in foundation piles |
| CN103196749A (en) * | 2012-01-07 | 2013-07-10 | 郑卫华 | Single-beam loading test vehicle |
| CN103499492A (en) * | 2013-10-01 | 2014-01-08 | 浙江工业职业技术学院 | Device and method for testing load in pile-end post-grouting chamber |
| CN103882892A (en) * | 2014-03-26 | 2014-06-25 | 国家电网公司 | Installation assisting device of static load displacement sensor |
| CN104142270A (en) * | 2014-07-31 | 2014-11-12 | 桂林理工大学 | Large reverse loading device |
| CN104631519A (en) * | 2015-01-13 | 2015-05-20 | 河海大学 | Pile foundation bearing characteristic model test device and method under complicated load effect |
| CN104929160A (en) * | 2015-05-08 | 2015-09-23 | 浙江元本检测技术有限公司 | Vacuum negative pressure static test pile technical method |
| CN105277444A (en) * | 2015-04-21 | 2016-01-27 | 河南理工大学 | Full-mechanical-type pile model test device and test method based on multidirectional loading |
| CN105821914A (en) * | 2016-06-11 | 2016-08-03 | 彭宝安 | Inflation folding type pile foundation static load detection ballasting water tank |
| CN116220114A (en) * | 2022-12-15 | 2023-06-06 | 中国铁路设计集团有限公司 | Device for testing vertical bearing capacity of water pile foundation |
-
1992
- 1992-11-26 CN CN 92242367 patent/CN2145379Y/en not_active Expired - Lifetime
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100453999C (en) * | 2007-07-31 | 2009-01-21 | 中铁二局股份有限公司 | 32m/900t prestressed concrete pretension box beam static loading test method |
| CN101413274B (en) * | 2008-11-26 | 2010-06-09 | 李道华 | Upper-stacking and lower-hanging combined load static load test pile apparatus |
| CN102051890A (en) * | 2010-11-23 | 2011-05-11 | 淮安市中涟工程机械制造有限公司 | Detection vehicle for static load test of single pile in foundation piles |
| CN103196749A (en) * | 2012-01-07 | 2013-07-10 | 郑卫华 | Single-beam loading test vehicle |
| CN103196749B (en) * | 2012-01-07 | 2015-04-15 | 郑卫华 | Single-beam loading test vehicle |
| CN103499492A (en) * | 2013-10-01 | 2014-01-08 | 浙江工业职业技术学院 | Device and method for testing load in pile-end post-grouting chamber |
| CN103882892B (en) * | 2014-03-26 | 2016-04-20 | 国家电网公司 | A kind of static load displacement transducer installation auxiliary device |
| CN103882892A (en) * | 2014-03-26 | 2014-06-25 | 国家电网公司 | Installation assisting device of static load displacement sensor |
| CN104142270A (en) * | 2014-07-31 | 2014-11-12 | 桂林理工大学 | Large reverse loading device |
| CN104631519A (en) * | 2015-01-13 | 2015-05-20 | 河海大学 | Pile foundation bearing characteristic model test device and method under complicated load effect |
| CN105277444A (en) * | 2015-04-21 | 2016-01-27 | 河南理工大学 | Full-mechanical-type pile model test device and test method based on multidirectional loading |
| CN105277444B (en) * | 2015-04-21 | 2018-03-09 | 河南理工大学 | Fully mechanical pile foundation model test apparatus and test method based on multidirectional loading |
| CN104929160A (en) * | 2015-05-08 | 2015-09-23 | 浙江元本检测技术有限公司 | Vacuum negative pressure static test pile technical method |
| CN105821914A (en) * | 2016-06-11 | 2016-08-03 | 彭宝安 | Inflation folding type pile foundation static load detection ballasting water tank |
| CN116220114A (en) * | 2022-12-15 | 2023-06-06 | 中国铁路设计集团有限公司 | Device for testing vertical bearing capacity of water pile foundation |
| CN116220114B (en) * | 2022-12-15 | 2023-08-08 | 中国铁路设计集团有限公司 | Device for testing vertical bearing capacity of water pile foundation |
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Address after: 315020 Zhejiang Province, Ningbo Jiangbei District Wenhui hole Pu village 8-101 Patentee after: Shen Changlu Patentee after: Shen Xuezhi Address before: 300192 Tianjin city Nankai District Anshan West Lake mansion 13-2-401 Patentee before: Shen Changlu Patentee before: Shen Xuezhi |
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| C15 | Extension of patent right duration from 15 to 20 years for appl. with date before 31.12.1992 and still valid on 11.12.2001 (patent law change 1993) | ||
| RN01 | Renewal of patent term | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |