CN106089223B - A kind of TBM Quick air pushes away method - Google Patents
A kind of TBM Quick air pushes away method Download PDFInfo
- Publication number
- CN106089223B CN106089223B CN201610464784.2A CN201610464784A CN106089223B CN 106089223 B CN106089223 B CN 106089223B CN 201610464784 A CN201610464784 A CN 201610464784A CN 106089223 B CN106089223 B CN 106089223B
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- tbm
- reaction frame
- pushes away
- supporting leg
- guide table
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000001351 cycling effect Effects 0.000 claims abstract description 4
- 230000003252 repetitive effect Effects 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 50
- 239000010959 steel Substances 0.000 claims description 50
- 241001669679 Eleotris Species 0.000 claims description 6
- 125000004122 cyclic group Chemical group 0.000 claims description 3
- 238000005538 encapsulation Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000009434 installation Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 235000014121 butter Nutrition 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/10—Making by using boring or cutting machines
- E21D9/1093—Devices for supporting, advancing or orientating the machine or the tool-carrier
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/0621—Shield advancing devices
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
- Machines For Laying And Maintaining Railways (AREA)
Abstract
The invention belongs to technical field of tunnel construction, and in particular to a kind of TBM Quick air pushes away method, includes the following steps: that (1) stepping prepares: applying preformed hole in arc guide table, production reaction frame and push away force-transmitting ring；(2) TBM is debugged；(3) after TBM debugging is qualified, reaction frame is installed；(4) force-transmitting ring will be pushed away to be installed between reaction frame and the telescopic oil cylinder of TBM；(5) telescopic oil cylinder is stretched out, TBM is slided forward；(6) telescopic oil cylinder is retracted, reaction frame is moved forward and is repositioned；(7) repetitive cycling carries out step (5), (6), until completing propulsion task.Invention significantly improves TBM skies to push away speed of application, accelerates construction speed；Simultaneously realize reaction frame installation, remove be rapidly completed and reaction frame be recycled, realize lightweight, simplify.
Description
Technical field
The invention belongs to technical field of tunnel construction, and in particular to a kind of TBM Quick air pushes away method.
Background technique
Currently, in shield or TBM (Tunnel Boring Machine, rock tunnel(ling) machine) construction tunnel, shield and
TBM sky pushes away counterforce device mainly using field fabrication, and Production Time is longer, and can not achieve recycling, leads to shield and TBM
It is slower that sky pushes away speed, inefficiency, and the empty advance rate of split run (for 24 hours) generally all only in 5~10m, greatlys restrict whole apply
Work progress, while increasing construction cost.The sky of TBM pushes away construction efficiency and speed and seriously restricts to the construction period and be constructed into
This, for this purpose, needing to seek a kind of i.e. simple and efficient process, and accordingly designs and produces a kind of light and handy, easy construction
Tool, and realize that Rapid Circulation using counterforce device, pushes away speed of application to improve TBM sky, accelerates construction progress.
Summary of the invention
It can be improved sky in view of the deficiencies of the prior art, it is an object of the present invention to provide one kind and push away speed of application, simple height
The TBM Quick air of effect pushes away method.
The technical solution that the present invention solves the problems, such as is:
A kind of TBM Quick air pushes away method, includes the following steps:
(1) stepping prepares, and includes the following steps:
(1.1) sky in arc guide table along TBM pushes away direction and applies several preformed holes；
(1.2) make reaction frame and push away force-transmitting ring: the reaction frame includes the frame body and supporting leg being combined as a whole, described
Supporting leg can be fixed in arc guide table by the preformed hole；
(2) TBM is debugged: unloaded debugging is carried out to each component of TBM, unloaded debugging and load debugging are carried out to TBM complete machine,
So that TBM machine condition, which has, originates driving condition；
(3) after TBM debugging is qualified, reaction frame is installed: using section of jurisdiction hoisting machine handling reaction frame, reaction frame is passed through into institute
Preformed hole is stated to be fixed in arc guide table；
(4) installed thrust transmits ring: will push away force-transmitting ring and is installed between reaction frame and the telescopic oil cylinder of TBM, so that institute
It states telescopic oil cylinder and provides thrust to the advance of TBM；
(5) telescopic oil cylinder is stretched out, TBM is slided forward；
(6) telescopic oil cylinder is retracted, lift by crane by section of jurisdiction hoisting machine and move forward reaction frame: the supporting leg of reaction frame is in section of jurisdiction
It is extracted from the preformed hole at place under the lifting of hoisting machine, reaction frame is inserted into arc guide table by supporting leg again after moving forward in place
Preformed hole repositioned；
(7) repetitive cycling carries out step (5), (6), until completing propulsion task: during propulsion, when sleeper needs
When extension, it is laid with sleeper, path extends；And in the process of propulsion, periodically reaction frame is checked, is debugged, it is necessary
Shi Jinhang is repaired, is reinforced.
Further, in the step (1.1), the arc guide table use strength grade for the concrete for making of C30 and
At.
Further, in the step (1.1), the sky of the TBM pushes away the longitudinal direction that direction is arc guide table, described pre-
The longitudinal pitch boxed out is 1000mm, and circumferential spacing is 1400mm.
Further, the preformed hole is set as two rows of, and the longitudinal direction of two rows of preformed holes arcuately guide table is parallel to each other.
Further, it is equipped in the step (1.1), in the preformed hole for cooperating with the supporting leg of reaction frame to be
The supporting leg of reaction frame provides the built-in fitting of counter-force, and to enhance the structural strength and pre-buried precision of preformed hole, the built-in fitting is used
Specification is side length × side length × wall thickness=250mm × 250mm × 10mm square steel.
Further, in the step (1.1), the arc guide table is equipped with the pre-buried rail for sliding for TBM, institute
Stating pre-buried rail is 2, and 2 pre-buried rail are arranged in parallel, and the preformed hole is arranged between 2 pre-buried rail.
Further, in the step (1.2), the frame body is in the japanese character frame shape laid flat, and the frame body includes knot
3 transverse bars and 2 longitudinal rods being integrated, 3 transverse bars are respectively the first transverse bar set gradually, the second cross
To bar, third transverse bar；The supporting leg is 4, and 4 supporting legs are separately positioned on the two of the second transverse bar and third transverse bar
The lower section at end, the supporting leg is perpendicular to the plane where frame body；One end where first transverse bar of the frame body be for
Push away one end of force-transmitting ring contact.
Further, in the step (1.2), the frame body and supporting leg be all made of specification be side length × side length × wall thickness=
200mm × 200mm × 8mm square steel is made.
Preferably, pass through welded connecting between each component of the reaction frame.
Further, in the step (1.2), the force-transmitting ring that pushes away is the cyclic annular knot being made of several arc ring plates
Structure, the arc ring plate are formed according to the contour structures of section of jurisdiction, dimensioned, and the arc ring plate is by several steel plates and several steel
Pipe is made.By using the form of steel plate and steel pipe combination, the force-transmitting ring that pushes away realizes lightweight, simplifies.
Further, 2 longitudinal terminal surfaces of the arc ring plate are 2 the first steel plates being disposed in parallel relation to one another, described in 2
It is connected between first steel plate by steel pipe, the steel pipe is perpendicular to the first steel plate；The outside cambered surface of the arc ring plate and inside
Cambered surface is encapsulated by the second steel plate, and the circumferential end face of 2 of the arc ring plate is encapsulated by third steel plate；The steel pipe is several,
Spacing between the steel pipe is arranged according to the spacing of the telescopic oil cylinder of TBM.
Preferably, the longitudinal length of the arc ring plate is 1500mm；The arc length of the outside cambered surface of the arc ring plate is
2500mm；The arc radius of the inside of first steel plate is 5400mm.
Preferably, in the step (4), the pre-buried rail after pushing away force-transmitting ring and being installed, in front of the cutter head of TBM
It is upper to play butter.
The invention has the benefit that
1. reaction frame is fixed on arc guide table by the preformed hole by applying preformed hole in arc guide table by the present invention
On, force-transmitting ring will be pushed away and be arranged between reaction frame and the telescopic oil cylinder of TBM, TBM sky is significantly improved and push away speed of application, accelerated
Construction speed；
2. the present invention realizes lightweight, simplifies, such as the structure design for pushing away force-transmitting ring, while realizing anti-
The installation of power frame, dismounting are rapidly completed and reaction frame is recycled.
Detailed description of the invention
Fig. 1 is the flow chart that TBM Quick air of the present invention pushes away method；
Fig. 2 is the structural schematic diagram of arc guide table used in method shown in Fig. 1；
Fig. 3 is the structural schematic diagram of reaction frame used in method shown in Fig. 1；
Fig. 4 is the structural schematic diagram that force-transmitting ring is pushed away in method shown in Fig. 1；
Fig. 5 is reaction frame in method shown in Fig. 1, arc guide table, the positional diagram for pushing away force-transmitting ring.
In figure: 1- arc guide table, 11- preformed hole, the pre-buried rail of 12-；2- reaction frame, 21- frame body, 211- first is laterally
Bar, the second transverse bar of 212-, 213- third transverse bar, 214- longitudinal rod, 22- supporting leg；3- arc ring plate, the first steel plate of 31-,
32- steel pipe, the second steel plate of 33-, 34- third steel plate；4-TBM, 41- telescopic oil cylinder.
Specific embodiment
With reference to the accompanying drawings and detailed description, the present invention is further illustrated.
As Figure 1-Figure 5, a kind of TBM Quick air pushes away method, includes the following steps:
(1) stepping prepares, and includes the following steps:
(1.1) sky in arc guide table 1 along TBM 4 pushes away direction and applies several preformed holes 11；
(1.2) make reaction frame 2 and push away force-transmitting ring: the reaction frame 2 includes the frame body 21 and supporting leg being combined as a whole
22, the supporting leg 22 can be fixed in arc guide table 1 by the preformed hole 11；
(2) debugging of TBM 4: carrying out unloaded debugging to each component of TBM 4, carries out unloaded debugging to 4 complete machine of TBM and bears
Debugging is carried, so that 4 machine condition of TBM, which has, originates driving condition；
(3) after TBM 4 debugs qualification, reaction frame 2 is installed: section of jurisdiction hoisting machine handling reaction frame 2 is used, by reaction frame 2
It is fixed in arc guide table 1 by the preformed hole 11；
(4) installed thrust transmits ring: force-transmitting ring will be pushed away and be installed between reaction frame 2 and the telescopic oil cylinder 41 of TBM 4, with
The telescopic oil cylinder 41 is set to provide thrust to the advance of TBM 4；
(5) telescopic oil cylinder 41 is stretched out, TBM 4 is slided forward；
(6) telescopic oil cylinder 41 is retracted, reaction frame 2: the supporting leg 22 of reaction frame 2 is lifted by crane and moved forward by section of jurisdiction hoisting machine
It is extracted from the preformed hole 11 at place under the lifting of section of jurisdiction hoisting machine, reaction frame 2 passes through supporting leg 22 after moving forward in place again
The preformed hole 11 of insertion arc guide table 1 is repositioned；
(7) repetitive cycling carries out step (5), (6), until completing propulsion task: during propulsion, when sleeper needs
When extension, it is laid with sleeper, path extends；And in the process of propulsion, periodically reaction frame 2 is checked, is debugged, it is necessary
Shi Jinhang is repaired, is reinforced.
In the step (1.1), the arc guide table 1 uses strength grade to form for the concrete for making of C30.It is described
The sky of TBM4 pushes away the longitudinal direction that direction is arc guide table 1, and the longitudinal pitch of the preformed hole 11 is 1000mm, and circumferential spacing is
1400mm.The preformed hole 11 is set as two rows of, and the longitudinal direction of two rows of preformed holes 11 arcuately guide table 1 is parallel to each other.It is described pre-
Box out be equipped in 11 for the cooperation of the supporting leg 22 of reaction frame 2 to provide the built-in fitting of counter-force for the supporting leg 22 of reaction frame 2, with
Enhance the structural strength and pre-buried precision of preformed hole 11, the built-in fitting uses specification for side length × side length × wall thickness=250mm
The square steel of × 250mm × 10mm.The arc guide table 1 is equipped with the pre-buried rail 12 for sliding for TBM 4, the pre-buried steel
Rail 12 is 2, and 2 pre-buried rail 12 are arranged in parallel, and the preformed hole 11 is arranged between 2 pre-buried rail 12.
In the step (1.2), the frame body 21 is in the japanese character frame shape laid flat, and the frame body 21 includes being combined into one
3 transverse bars of body and 2 longitudinal rods, 214,3 transverse bars are respectively first the 211, second cross of transverse bar set gradually
To bar 212, third transverse bar 213；The supporting leg 22 is 4, and 4 supporting legs 22 are separately positioned on 212 He of the second transverse bar
The lower section at the both ends of third transverse bar 213, the supporting leg 22 is perpendicular to the plane where frame body 21；The first of the frame body 21 is horizontal
To one end where bar 211 be for one end for pushing away force-transmitting ring and contacting.The frame body 21 and supporting leg 22 are all made of specification and are
Side length × side length × wall thickness=200mm × 200mm × 8mm square steel is made.Pass through between each component of the reaction frame 2
It is welded to connect.
In the step (1.2), the force-transmitting ring that pushes away is the cyclic structure being made of several arc ring plates 3, described
Arc ring plate 3 is formed according to the contour structures of section of jurisdiction, dimensioned, and the arc ring plate 3 is by several steel plates and several steel pipes 32
It is made.By using the combined form of steel plate and steel pipe 32, the force-transmitting ring that pushes away realizes lightweight, simplifies.Institute
2 longitudinal terminal surfaces for stating arc ring plate 3 are to lead between 2 31,2 first steel plates 31 of the first steel plate being disposed in parallel relation to one another
The connection of steel pipe 32 is crossed, the steel pipe 32 is perpendicular to the first steel plate 31；The outside cambered surface and inside cambered surface of the arc ring plate 3 are by
The encapsulation of two steel plates 33, the circumferential end face of 2 of the arc ring plate 3 are encapsulated by third steel plate 34；The steel pipe 32 is 2, described
Spacing between steel pipe 32 is arranged according to the spacing of the telescopic oil cylinder 41 of TBM 4.The longitudinal length of the arc ring plate 3 is
1500mm；The arc length of the outside cambered surface of the arc ring plate 3 is 2500mm；The arc radius of the inside of first steel plate 31 is
5400mm。
In the step (4), after pushing away force-transmitting ring and being installed, on the pre-buried rail 12 in front of the cutter head of TBM 4
Play butter.
Present invention is not limited to the embodiments described above, without departing substantially from substantive content of the present invention, art technology
Any deformation, improvement, the replacement that personnel are contemplated that each fall within protection scope of the present invention.
Claims (7)
1. a kind of TBM Quick air pushes away method, which comprises the steps of:
(1) stepping prepares, and includes the following steps:
(1.1) sky in arc guide table along TBM pushes away direction and applies several preformed holes, be equipped in the preformed hole for it is anti-
To provide the built-in fitting of counter-force for the supporting leg of reaction frame, the built-in fitting uses specification for side length × side for the supporting leg cooperation of power frame
Length × wall thickness=250mm × 250mm × 10mm square steel；
(1.2) make reaction frame and push away force-transmitting ring: the reaction frame includes the frame body and supporting leg being combined as a whole, the supporting leg
It can be fixed in arc guide table by the preformed hole, the force-transmitting ring that pushes away is the cyclic annular knot being made of several arc ring plates
Structure, the arc ring plate are formed according to the contour structures of section of jurisdiction, dimensioned, and the arc ring plate is by several steel plates and several steel
Pipe is made, and 2 longitudinal terminal surfaces of the arc ring plate are 2 the first steel plates being disposed in parallel relation to one another, 2 first steel
It is connected between plate by steel pipe, the steel pipe is perpendicular to the first steel plate；The outside cambered surface and inside cambered surface of the arc ring plate by
The encapsulation of second steel plate, the circumferential end face of 2 of the arc ring plate are encapsulated by third steel plate；The steel pipe be several, the steel
Spacing between pipe is arranged according to the spacing of the telescopic oil cylinder of TBM；
(2) TBM is debugged: being carried out unloaded debugging to each component of TBM, is carried out unloaded debugging and load debugging to TBM complete machine；
(3) after TBM debugging is qualified, reaction frame is installed: using section of jurisdiction hoisting machine handling reaction frame, reaction frame is passed through described pre-
It boxes out and is fixed in arc guide table；
(4) installed thrust transmits ring: will push away force-transmitting ring and is installed between reaction frame and the telescopic oil cylinder of TBM；
(5) telescopic oil cylinder is stretched out, TBM is slided forward；
(6) retract telescopic oil cylinder, lifted by crane by section of jurisdiction hoisting machine and move forward reaction frame: the supporting leg of reaction frame is lifted in section of jurisdiction
It is extracted from the preformed hole at place under the lifting of machine, reaction frame is inserted into the pre- of arc guide table by supporting leg again after moving forward in place
It boxes out and is repositioned；
(7) repetitive cycling carries out step (5), (6), until completing propulsion task: during propulsion, when sleeper needs to extend
When, it is laid with sleeper, path extends；And in the process of propulsion, periodically reaction frame is checked, is debugged.
2. TBM Quick air according to claim 1 pushes away method, which is characterized in that in the step (1.1), the arc
Guide table uses strength grade to form for the concrete for making of C30.
3. TBM Quick air according to claim 1 pushes away method, which is characterized in that in the step (1.1), the TBM's
Sky pushes away the longitudinal direction that direction is arc guide table, and the longitudinal pitch of the preformed hole is 1000mm, and circumferential spacing is 1400mm.
4. TBM Quick air according to claim 3 pushes away method, which is characterized in that the preformed hole is set as two rows of, two rows of pre-
The longitudinal direction for the arcuately guide table of boxing out is parallel to each other.
5. TBM Quick air according to claim 1 pushes away method, which is characterized in that in the step (1.1), the arc
Guide table is equipped with the pre-buried rail for sliding for TBM, and the pre-buried rail is 2, and 2 pre-buried rail are arranged in parallel,
The preformed hole is arranged between 2 pre-buried rail.
6. TBM Quick air according to claim 1 pushes away method, which is characterized in that in the step (1.2), the frame body
In the japanese character frame shape laid flat, the frame body includes 3 transverse bars and 2 longitudinal rods being combined as a whole, 3 transverse directions
Bar is respectively the first transverse bar, the second transverse bar, the third transverse bar set gradually；The supporting leg is 4,4 supporting legs
It is separately positioned on the lower section at the both ends of the second transverse bar and third transverse bar, the supporting leg is perpendicular to the plane where frame body；Institute
State one end where the first transverse bar of frame body be for one end for pushing away force-transmitting ring and contacting.
7. TBM Quick air according to claim 6 pushes away method, which is characterized in that the frame body and supporting leg are all made of specification
It is made for side length × side length × wall thickness=200mm × 200mm × 8mm square steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610464784.2A CN106089223B (en) | 2016-06-24 | 2016-06-24 | A kind of TBM Quick air pushes away method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610464784.2A CN106089223B (en) | 2016-06-24 | 2016-06-24 | A kind of TBM Quick air pushes away method |
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| Publication Number | Publication Date |
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| CN106089223A CN106089223A (en) | 2016-11-09 |
| CN106089223B true CN106089223B (en) | 2019-04-19 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020172195A1 (en) * | 2019-02-21 | 2020-08-27 | TopEng Inc. | System and method for simultaneous excavation and segment erection of tbm by thrust shell |
| NL2023905B1 (en) * | 2019-09-25 | 2020-09-04 | Shanghai Minie Tech Co Ltd | Plane sliding advancing device for shield machine |
| CN113756827B (en) * | 2021-09-13 | 2023-08-11 | 广东水电二局股份有限公司 | Bearing wheel device and TBM air-pushing stepping method based on bearing wheel device |
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| CN102425433A (en) * | 2011-12-30 | 2012-04-25 | 中铁一局集团有限公司 | Minus-ring-free originating construction method for constructing sectional shield tunnel |
| CN102425427A (en) * | 2011-12-30 | 2012-04-25 | 中铁二局股份有限公司 | Shield air-pushing mine method tunnel construction method |
| KR101149836B1 (en) * | 2009-11-06 | 2012-05-29 | 성림산업(주) | high speed assembling method of curved panel using a radial shape assembling device and conduit line construction process using the same |
| CN104653229A (en) * | 2015-01-27 | 2015-05-27 | 粤水电轨道交通建设有限公司 | Shielding sliding shoe curvilinear pushing-up hole-passing construction method |
| CN204402559U (en) * | 2015-01-26 | 2015-06-17 | 粤水电轨道交通建设有限公司 | A kind of large jacking force shield machine air pushes through hole truss-like reaction support group |
| CN105587322A (en) * | 2015-12-31 | 2016-05-18 | 中交一公局第三工程有限公司 | TBM integral step station-crossing method |
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- 2016-06-24 CN CN201610464784.2A patent/CN106089223B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101149836B1 (en) * | 2009-11-06 | 2012-05-29 | 성림산업(주) | high speed assembling method of curved panel using a radial shape assembling device and conduit line construction process using the same |
| CN102425433A (en) * | 2011-12-30 | 2012-04-25 | 中铁一局集团有限公司 | Minus-ring-free originating construction method for constructing sectional shield tunnel |
| CN102425427A (en) * | 2011-12-30 | 2012-04-25 | 中铁二局股份有限公司 | Shield air-pushing mine method tunnel construction method |
| CN204402559U (en) * | 2015-01-26 | 2015-06-17 | 粤水电轨道交通建设有限公司 | A kind of large jacking force shield machine air pushes through hole truss-like reaction support group |
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| Publication number | Publication date |
|---|---|
| CN106089223A (en) | 2016-11-09 |
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| CB03 | Change of inventor or designer information |
Inventor after: Huang Xuejun Inventor after: Kou Jian Inventor after: Gong Xuejun Inventor after: Shi Sipeng Inventor after: Li Nanchuan Inventor after: Huang Yongsheng Inventor after: Li Yujiang Inventor after: Dai Runjun Inventor after: Han Jiankun Inventor after: Liu Junsheng Inventor after: Feng Fei Inventor after: Xiao Lixing Inventor before: Huang Xuejun Inventor before: Kou Jian Inventor before: Gong Xuejun Inventor before: Shi Sipeng Inventor before: Li Nanchuan Inventor before: Huang Yongsheng Inventor before: Li Yujiang Inventor before: Dai Runjun Inventor before: Han Jiankun Inventor before: Liu Junsheng Inventor before: Feng Fei Inventor before: Xiao Lixing |
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| GR01 | Patent grant | ||
| GR01 | Patent grant |