CN110455481B - Three-dimensional laminated shearing model box - Google Patents
Three-dimensional laminated shearing model box Download PDFInfo
- Publication number
- CN110455481B CN110455481B CN201910817944.0A CN201910817944A CN110455481B CN 110455481 B CN110455481 B CN 110455481B CN 201910817944 A CN201910817944 A CN 201910817944A CN 110455481 B CN110455481 B CN 110455481B
- Authority
- CN
- China
- Prior art keywords
- universal ball
- limiting
- dimensional
- baffle plate
- hub
- 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.)
- Active
Links
- 238000010008 shearing Methods 0.000 title claims abstract description 16
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 24
- 229910000831 Steel Inorganic materials 0.000 claims description 16
- 239000010959 steel Substances 0.000 claims description 16
- 244000309464 bull Species 0.000 claims description 6
- 238000005096 rolling process Methods 0.000 claims description 2
- 239000002689 soil Substances 0.000 abstract description 25
- 239000010410 layer Substances 0.000 description 18
- 238000012360 testing method Methods 0.000 description 15
- 238000006073 displacement reaction Methods 0.000 description 8
- 238000013461 design Methods 0.000 description 4
- 230000008846 dynamic interplay Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000011229 interlayer Substances 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000001143 conditioned effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Sampling And Sample Adjustment (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention relates to a three-dimensional laminated shearing model box, which is formed by splicing H-shaped aluminum alloy laminated frames, wherein webs of adjacent H-shaped aluminum alloy laminated frames are connected through a plurality of connecting pieces; the limiting control piece comprises a parallel baffle plate with a hub, a lower seat and symmetrical limiting holes, the middle part of the parallel baffle plate with the hub is provided with a circular ring, and two symmetrical wings are arranged on two sides of the parallel baffle plate. The invention can more effectively simulate the soil body boundary condition.
Description
Technical Field
The invention relates to a three-dimensional laminated shear model box device for a vibrating table test.
Background
Currently, the shaking table test is gradually applied in the geotechnical engineering field. In studying the soil-structure dynamic interactions using the shaking table test, it is necessary to provide a conditioned container, i.e., a model box, for the soil. The model box has limited volume and can vibrate along with the vibration of the table top, so that the soil body in the model box cannot completely simulate the free foundation condition and cannot reasonably simulate the infinite boundary condition of the foundation soil, which causes great difficulty for the test. The design of the model box for the vibrating table test is also an important work in the test of the soil-structure dynamic interaction vibrating table, and the model box with reasonable design is a precondition for smoothly completing the vibrating table test.
The typical model boxes mainly comprise a rigid model soil box, a cylindrical flexible model soil box and a layered shearing model soil box. The rigid model soil box has high overall rigidity, small lateral deformation of the box wall and strong boundary reflection, and the friction effect is considered, so that the larger boundary effect is easy to generate; the cylindrical flexible model soil box has flexibility, but the rigidity is difficult to control, and the soil layer is easy to bend and deform; the layered shearing model soil box is an ideal model soil box at present, and is formed by assembling a plurality of independent layered frames, wherein the frames can slide relatively in the horizontal direction, so that the shearing deformation of soil layers can be realized, and the soil body boundary conditions can be better simulated.
The existing layered shearing model soil box is mostly applied to a vibrating table test with a one-dimensional or two-dimensional vibrating direction, and the soil-structure dynamic interaction research of a complex engineering structure needs to consider the effect of three-way earthquake input, namely the model soil box needs to realize the vibration in two mutually perpendicular horizontal directions and one vertical direction. Most of the existing layered shearing model soil boxes are rectangular, limit devices are required to be arranged to prevent the existing layered shearing model soil boxes from generating excessive displacement, the cost is high, the installation is complex, and the model test requirements are difficult to well meet. The prior layered shearing model soil box interlayer connection mostly adopts springs, screws, bearings, balls and the like, so that interlayer friction is large, only the model box frame can move in two mutually perpendicular horizontal directions or a single horizontal direction, the model box frame cannot move freely in three directions, the characteristic research of model soil is influenced, and interlayer relative displacement cannot be effectively limited.
Disclosure of Invention
Aiming at the problems, the invention aims to overcome the defects of the existing layered shearing model soil box and the connecting piece thereof, and provides the three-dimensional layered shearing model box, and the model box frame can freely move in two mutually vertical horizontal directions and one vertical direction through the design of the three-dimensional limiting connecting piece, so that the soil body boundary condition can be more effectively simulated. The technical scheme of the invention is as follows:
the three-dimensional laminated shearing model box is formed by splicing H-shaped aluminum alloy laminated frames, web plates of adjacent H-shaped aluminum alloy laminated frames are connected through a plurality of connecting pieces, and is characterized in that the limiting connecting pieces are three-dimensional limiting connecting pieces and comprise a moving member, a limiting control piece and a fixed member,
the movable component comprises a universal ball and a bullnose joint, the bullnose joint passes through the upper layer frame web plate and is fixedly connected with the universal ball, steel balls capable of freely rolling are arranged below the universal ball and are arranged on the lower layer frame web plate to be in point contact with the lower layer frame web plate, and friction-free movement in the horizontal direction can be realized;
the limiting control piece comprises a parallel baffle plate with a hub, a lower seat and a symmetrical limiting opening, wherein the middle part of the parallel baffle plate with the hub is provided with a circular ring, two symmetrical wings are arranged on two sides of the parallel baffle plate, a bull's eye joint and a universal ball are connected and then are sleeved in the circular ring in the middle part of the parallel baffle plate with the hub together, two symmetrical limiting openings are arranged on two sides of the lower seat, the two wings of the parallel baffle plate with the hub are respectively inserted into the symmetrical limiting openings on two sides of the lower seat and are used for limiting the movement direction of the universal ball, so that the universal ball can only move in two horizontal directions and one vertical direction which are mutually perpendicular, the movement distance of the universal ball in the vertical direction is limited within a certain range, a round hole is formed in the upper part of the lower seat, the moving member penetrates and moves, and the cylindrical outer wall of the lower seat limits the movement distance of the universal ball in the horizontal direction, so that the universal ball moves in a certain range in each horizontal direction;
and the fixing component is used for fixing the three-dimensional limiting connecting piece on the upper frame web plate and the lower frame web plate of the model box.
Preferably, the moving member further comprises a sleeve disposed outside the bullseye joint, and the sleeve and the bullseye joint are jointly connected with the universal ball to enhance vertical bearing capacity. The periphery of the spliced frame is provided with a plurality of guardrails. The lower part of the spliced frame is fixed through a bottom plate. The spliced frame is cylindrical.
The invention has the following advantages:
(1) The invention relates to a cylindrical three-dimensional laminated shearing model box device for a vibration table test, which can realize the vibration of a model soil box in two mutually vertical horizontal directions and one vertical direction by utilizing a three-dimensional limiting connecting piece between layers, and meets the requirement of the vibration table model test;
(2) The three-dimensional limiting connecting piece is used for connecting the layered frames, and the design of the universal ball and the parallel baffle with the hub ensures that friction force is not generated between two mutually connected frame layers, so that the real foundation situation can be effectively simulated;
(3) The model box is cylindrical, materials are saved, the layered frame is made of H-shaped aluminum alloy, the rigidity requirement can be effectively met, and the weight is light; simple structure, convenient manufacture, reliable function, flexible use and effective test cost saving.
Drawings
FIG. 1 is a top view of a cylindrical three-dimensional stacked shear molding box apparatus of the present invention.
FIG. 2 is a cross-sectional view of a cylindrical three-dimensional stacked shear mold box apparatus of the present invention.
Fig. 3 is a top view of the three-dimensional spacing connector of the present invention.
Fig. 4 is a cross-sectional view of a three-dimensional spacing connector of the present invention.
Fig. 5 is a schematic view of a three-dimensional spacing connector moving member of the present invention.
Fig. 6 is a schematic view of a three-dimensional limit connector limit control of the present invention.
The reference numerals in the figures illustrate: 1, a bolt; 2, a gasket; 3 bullseye fitting; 4, a sleeve; 5, universal ball; 6 parallel baffle plates with hubs; 7, lower seat; 8, a steel bottom plate; a 9H-type aluminum alloy layered frame; 10 three-dimensional limit connecting pieces; 11 guard rails; 12 symmetrical limiting holes; 13 upper frame webs; 14 lower frame web.
Detailed Description
The present invention will now be described with reference to the accompanying drawings and examples which will enable those skilled in the art to more fully understand the invention and are not intended to limit the invention in any way.
Referring to fig. 1, 2, 3, 4, 5 and 6, the present invention provides a cylindrical three-dimensional laminated shear model box device for a vibration table test and a three-dimensional limit connector thereof, and the specific test device comprises: a steel soleplate 8,H type aluminum alloy layered frame 9 is arranged on the upper part of the steel soleplate 8; the three-dimensional limiting connecting piece 10 is arranged between the H-shaped aluminum alloy layered frames 9; the guard rail 11 is arranged around the H-shaped aluminum alloy layered frame 9 and is fixed to the steel bottom plate 8. The steel base plate 8 needs to have a strong rigidity to meet the load-bearing capacity requirement. The H-shaped aluminum alloy layered frame 9 is a closed circular ring formed by welding H-shaped aluminum alloy, is arranged in parallel at equal intervals in the vertical direction, and is formed by 14 layers in total, and the layers are connected by using a three-dimensional limiting connecting piece 10. The three-dimensional limiting connecting pieces 10 are fixed on the web plate of the H-shaped aluminum alloy layered frame 9 through bolts, 6 three-dimensional limiting connecting pieces 10 are arranged on each layer at equal intervals, a single three-dimensional limiting connecting piece 10 has certain strength to meet the bearing capacity requirement, the three-dimensional limiting connecting pieces 10 enable relative sliding between layers to be free of friction, the vertical displacement requirement can be met, and the horizontal displacement and the vertical displacement are limited within +/-5 mm. The guardrail 11 is formed by welding rectangular section steel pipes, and is provided with 8, and the guardrail is equidistantly encircled on the steel bottom plate 8 and is fixed on the H-shaped aluminum alloy layered frame 9 for a circle, so that the model soil box is prevented from excessively horizontally displacing in the vibration process.
Guard rails 11 mounted equidistantly around the periphery of the cylindrical three-dimensional laminated shear mold box can be used to limit excessive horizontal displacement of the mold box during vibration. The H-shaped aluminum alloy layered frame 9 formed by welding aluminum alloy has sufficient rigidity to make the lateral strain of the model soil body zero, and can maintain its initial state after the vibration is finished. The three-dimensional limiting connecting piece 10 between layers can enable the layers to slide in a horizontal direction without friction, and can also generate displacement in a vertical direction, and the displacement can be limited in a certain range.
The three-dimensional limiting connector 10 for the cylindrical three-dimensional laminated shearing model box specifically comprises: the connecting piece is fixed on an upper layer frame web 13 (a web of an upper layer H-shaped aluminum alloy layered frame) by 3 bolts 1 and 2 gaskets 2 together, and meanwhile, a sleeve 4 is fixed on the periphery of the bullseye joint 3; the upper end of the universal ball 5 passes through a middle circular ring of the parallel baffle 6 with the hub and a round hole at the upper part of the lower seat 7 to be sleeved in the bull's eye joint 3; two symmetrical wings on two sides of the parallel baffle plate 6 with the hub are respectively inserted into symmetrical limiting holes 12 on two sides of the lower seat 7, and the lower seat 7 is fixed on a web 14 of the lower frame (a web of the lower H-shaped aluminum alloy layered frame). The bull's eye joint 3, the steel sleeve 4 and the universal ball 5 need to have stronger strength to meet the bearing capacity requirement.
The steel balls below the universal ball 5 can realize friction-free movement in the horizontal direction. The parallel baffle 6 with the hub limits the moving direction of the universal ball 5 through the insertion connection of the two wings and the symmetrical limiting holes 12 on the two sides of the lower seat 7, so that the universal ball 5 can only move in two horizontal directions and one vertical direction which are perpendicular to each other, and simultaneously limits the moving distance of the universal ball 5 in the vertical direction, so that the universal ball can only move in the range of 5 mm upwards in the vertical direction. The cylindrical outer wall of the lower seat 7 limits the moving distance of the universal ball 5 in the horizontal direction so that the moving distance thereof is kept within + -5 mm. The vertical pressure is borne by the bull's eye joint 3, the steel sleeve 4 and the universal ball 5, so that no pressure is generated between the parallel baffle 6 with the hub and the lower seat 7, and no friction force is generated.
The cylindrical three-dimensional laminated shear model box device for the vibration table test comprises the following using steps:
(1) A steel bottom plate 8 and a sheet of H-shaped aluminum alloy layered frame 9 are connected by bolts;
(2) The H-shaped aluminum alloy layered frames 9 are overlapped from bottom to top, 6 equidistant three-dimensional limiting connecting pieces 10 are used for connecting the layers, and in the connecting process, the H-shaped aluminum alloy layered frames 9 are ensured to be horizontal and are arranged at equal intervals in the vertical direction;
(3) A steel base plate 8 and equidistantly arranged guard rails 11 are bolted.
The three-dimensional connecting piece comprises the following using steps:
(1) 2 bolts 1 and 1 washer 2 are used for fixing a steel sleeve 4 on the periphery of a bullseye joint 3;
(2) Two wings with a hub parallel baffle 6 are penetrated into symmetrical limiting holes 12 on two sides of the lower seat 7, and the centers of the two components are positioned on the same vertical line;
(3) The upper end of the universal ball 5 passes through a middle circular ring of the parallel baffle 6 with a hub and a round hole at the upper part of the lower seat 7, and is inserted into a mortise-tenon joint structure at the lower end of the bull's eye joint 3;
(4) The connector is integrally fixed to the upper frame web 13 (web of the upper H-type aluminum alloy layered frame) using 1 bolt 1 and 1 washer 2.
(5) The lower seat 7 is fixed on a web plate 14 of a lower layer frame (a web plate of a lower layer H-shaped aluminum alloy layered frame), and steel balls below the universal balls 5 can slide horizontally on the web plate.
The invention is not limited to the embodiments described above. The above description of specific embodiments is intended to describe and illustrate the technical aspects of the present invention, and is intended to be illustrative only and not limiting. Numerous specific modifications can be made by those skilled in the art without departing from the spirit of the invention and scope of the claims, which are within the scope of the invention.
Claims (3)
1. The three-dimensional laminated shearing model box is formed by splicing H-shaped aluminum alloy laminated frames, web plates of adjacent H-shaped aluminum alloy laminated frames are connected through a plurality of connecting pieces, and is characterized in that the connecting pieces are three-dimensional limiting connecting pieces, and comprise a moving member, a limiting control piece and a fixed member,
the movable component comprises a universal ball and a bullnose joint, the bullnose joint passes through the upper layer frame web plate and is fixedly connected with the universal ball, steel balls capable of freely rolling are arranged below the universal ball and are arranged on the lower layer frame web plate to be in point contact with the lower layer frame web plate, and friction-free movement in the horizontal direction can be realized;
the limiting control piece comprises a parallel baffle plate with a hub, a lower seat and a symmetrical limiting opening, wherein the middle part of the parallel baffle plate with the hub is provided with a circular ring, two symmetrical wings are arranged on two sides of the parallel baffle plate, a bull's eye joint and a universal ball are connected and then are sleeved in the circular ring in the middle part of the parallel baffle plate with the hub together, two symmetrical limiting openings are arranged on two sides of the lower seat, the two wings of the parallel baffle plate with the hub are respectively inserted into the symmetrical limiting openings on two sides of the lower seat and are used for limiting the movement direction of the universal ball, so that the universal ball can only move in two horizontal directions and one vertical direction which are mutually perpendicular, the movement distance of the universal ball in the vertical direction is limited within a certain range, a round hole is formed in the upper part of the lower seat, the moving member penetrates and moves, and the cylindrical outer wall of the lower seat limits the movement distance of the universal ball in the horizontal direction, so that the universal ball moves in a certain range in each horizontal direction;
the fixing component is used for fixing the three-dimensional limiting connecting piece on the upper layer frame web plate and the lower layer frame web plate of the model box, a plurality of guardrails are arranged on the periphery of the spliced frame, and the lower portion of the spliced frame is fixed through a bottom plate.
2. The mold box of claim 1, wherein the moving member further comprises a sleeve disposed outside the bullseye fitting, the sleeve and the bullseye fitting cooperatively coupled to the universal ball to enhance vertical load bearing.
3. The mold box of claim 1, wherein the spliced frame is cylindrical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910817944.0A CN110455481B (en) | 2019-08-30 | 2019-08-30 | Three-dimensional laminated shearing model box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910817944.0A CN110455481B (en) | 2019-08-30 | 2019-08-30 | Three-dimensional laminated shearing model box |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110455481A CN110455481A (en) | 2019-11-15 |
| CN110455481B true CN110455481B (en) | 2024-02-23 |
Family
ID=68490267
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910817944.0A Active CN110455481B (en) | 2019-08-30 | 2019-08-30 | Three-dimensional laminated shearing model box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110455481B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110455480B (en) * | 2019-08-30 | 2023-07-14 | 天津大学 | Three-dimensional limiting connecting piece for three-dimensional laminated shearing model box |
| CN117330395B (en) * | 2023-12-01 | 2024-04-09 | 中国电建集团成都勘测设计研究院有限公司 | Model box for simulating viscoelastic boundary |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06346624A (en) * | 1993-06-07 | 1994-12-20 | Fujisash Co | Movable joint testing device for use in building |
| CN201965008U (en) * | 2011-03-07 | 2011-09-07 | 北京工业大学 | Superposed two-way shearing type model box device used for test of vibration table |
| CN201974280U (en) * | 2011-03-07 | 2011-09-14 | 北京工业大学 | Laminated multidirectional shearing type mouldcase device used for vibrostand test |
| CN202647128U (en) * | 2012-04-11 | 2013-01-02 | 惠州华阳通用电子有限公司 | Rotary positioning platform |
| CN104913889A (en) * | 2015-05-14 | 2015-09-16 | 北京工业大学 | Three-direction free movement support member applied to circular layered model box |
| CN205786081U (en) * | 2016-07-07 | 2016-12-07 | 南通筑升土木工程科技有限责任公司 | A kind of Novel stack laminar shear model box limitting casing and there is the model casing of this frame |
| CN106297517A (en) * | 2016-08-18 | 2017-01-04 | 南通筑升土木工程科技有限责任公司 | A kind of double direction shear palletizing die molding box |
| CN207248472U (en) * | 2017-05-03 | 2018-04-17 | 中国石油天然气集团公司 | A kind of 3-D stacks shear case |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10161826B2 (en) * | 2016-05-04 | 2018-12-25 | International Business Machines Corporation | Method and apparatus for inducing multiaxial excitation |
-
2019
- 2019-08-30 CN CN201910817944.0A patent/CN110455481B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06346624A (en) * | 1993-06-07 | 1994-12-20 | Fujisash Co | Movable joint testing device for use in building |
| CN201965008U (en) * | 2011-03-07 | 2011-09-07 | 北京工业大学 | Superposed two-way shearing type model box device used for test of vibration table |
| CN201974280U (en) * | 2011-03-07 | 2011-09-14 | 北京工业大学 | Laminated multidirectional shearing type mouldcase device used for vibrostand test |
| CN202647128U (en) * | 2012-04-11 | 2013-01-02 | 惠州华阳通用电子有限公司 | Rotary positioning platform |
| CN104913889A (en) * | 2015-05-14 | 2015-09-16 | 北京工业大学 | Three-direction free movement support member applied to circular layered model box |
| CN205786081U (en) * | 2016-07-07 | 2016-12-07 | 南通筑升土木工程科技有限责任公司 | A kind of Novel stack laminar shear model box limitting casing and there is the model casing of this frame |
| CN106297517A (en) * | 2016-08-18 | 2017-01-04 | 南通筑升土木工程科技有限责任公司 | A kind of double direction shear palletizing die molding box |
| CN207248472U (en) * | 2017-05-03 | 2018-04-17 | 中国石油天然气集团公司 | A kind of 3-D stacks shear case |
Non-Patent Citations (2)
| Title |
|---|
| 振动台试验三维层状剪切模型箱的设计及性能测试;李小军;王晓辉;李亮;韩杰;;岩土力学;20170510(第05期);全文 * |
| 振动台试验叠层剪切型土箱的研制;陈国兴;王志华;左熹;杜修力;韩晓健;;岩土工程学报;20100115(第01期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110455481A (en) | 2019-11-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110455481B (en) | Three-dimensional laminated shearing model box | |
| CN203712691U (en) | Six-freedom-degree motion simulation component | |
| EP2483486B1 (en) | Damping system | |
| CN103175707A (en) | Testing apparatus suitable for substructure robustness of beam-column joints of planar frames | |
| CN108489693B (en) | Assembled model soil box for simulating viscoelastic boundary | |
| CN108318329B (en) | Shearing box | |
| CN101725190A (en) | Three-dimensional composite seismic isolation supporting seat | |
| CN103114650B (en) | Roll shaft type metal shock-insulating supporting seat | |
| AU2015394927B1 (en) | All-steel double-plate self-resetting buckling-restrained brace device and method | |
| CN101338593A (en) | Anti-vibration device | |
| CN212180215U (en) | Three-dimensional laminated shearing model box | |
| CN110455480B (en) | Three-dimensional limiting connecting piece for three-dimensional laminated shearing model box | |
| CN107165041B (en) | Shock-absorbing and isolating steel support | |
| CN214694913U (en) | Three-dimensional vibration isolation device | |
| CN105696722A (en) | Metal shearing type energy dissipation device with displacement amplifying function | |
| CN214614718U (en) | Vibration isolation device | |
| CN214613345U (en) | Three-dimensional vibration isolation device for rail transit upper cover structure | |
| CN202767356U (en) | Damping and shake-proof building wall and floor | |
| CN203654333U (en) | Eight-cylinder embedded and sleeved cylindrical universal damper | |
| CN206681452U (en) | A kind of three-dimensional isolation vibration absorber | |
| CN110320096B (en) | Loading device suitable for plate column structure-corner column node punching resistance test | |
| CN110044727B (en) | Test loading device suitable for plate column structure-side column node punching resistance test | |
| CN210421438U (en) | Three-dimensional vibration isolation support of antidumping | |
| CN110644643A (en) | Torsion damping shock absorption device | |
| JP2014234590A (en) | Base isolation device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |