CN113294160B - Pipe jacking construction retaining device suitable for stratum with high water pressure and high water permeability - Google Patents
Pipe jacking construction retaining device suitable for stratum with high water pressure and high water permeability Download PDFInfo
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- CN113294160B CN113294160B CN202110645826.3A CN202110645826A CN113294160B CN 113294160 B CN113294160 B CN 113294160B CN 202110645826 A CN202110645826 A CN 202110645826A CN 113294160 B CN113294160 B CN 113294160B
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- pipe
- jacking
- pipe jacking
- rod
- threaded rod
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Abstract
The invention discloses a pipe jacking construction stopping device suitable for high-water-pressure and high-water-permeability stratum, which comprises a working well and a pipe jacking body, wherein a construction opening matched with the pipe jacking body is formed in the side wall of the working well, a plurality of first fixing bolts are circumferentially distributed around the construction opening, and each first fixing bolt is connected with a first thread cylinder through thread rotation. The invention has the advantages that the clamping force can be applied to the pipe jacking from the outside of the pipe jacking body through the first clamping device, and the clamping force can be applied from the inside of the pipe jacking body through the second clamping device, so that the contact area between the whole retaining device and the pipe jacking body is larger, the static friction force between the pipe jacking body and the retaining device is enlarged, the whole retaining device can effectively fix the pipe jacking body, and meanwhile, the forces applied by the first clamping device and the second clamping device can act on the pipe jacking body in equal and opposite directions, so that the pipe jacking body does not have a deformation trend.
Description
Technical Field
The invention relates to the technical field of pipe jacking construction, in particular to a pipe jacking construction stopping device suitable for high-water-pressure and high-water-permeability strata.
Background
With the development of cities, urban land resources are becoming more scarce, and urban construction is also increasingly dependent on the development of underground spaces. The pipe jacking technology plays an important role in urban pipeline construction. With the development of large-scale pipe jacking technology, the pipe jacking technology has become an important construction mode for setting urban pedestrian passages and the like. However, the pipe jacking is underground engineering, and the buried depth is deeper in the pipe jacking construction process under the general condition, and the front soil pressure is high due to the high groundwater level and weak soil layer in south areas such as Shanghai. In the initial stage of pipe jacking construction, the side friction resistance of the pipe jacking construction is far smaller than the front soil pressure, and the front soil pressure can be balanced only by applying a jacking force to the tail part of the pipe jacking. However, due to the self-characteristics of pipe jacking construction, when a pipe joint of the pipe jacking is increased, a jack for applying jacking force to the tail part of the pipe jacking must retract, so that the jacking force is removed. In order to ensure that the advanced pipe joint does not retract, a pipe jacking stopping device or measure is required to be arranged to prevent the pipe joint from retreating.
At present, two measures for preventing the pipe jacking from backing are mainly adopted, the first measure is to arrange embedded steel plates on the wall of an originating well around the pipe jacking and the pipe jacking pipe joints respectively, and when the jack is required to retract in order to increase the pipe jacking pipe joints, the connecting steel plates are welded on the embedded steel plates on the wall of the originating well and the embedded steel plates on the pipe joints, so that the wall of the originating well and the pipe joints are connected into a whole. The non-return method needs to be welded with the steel plates, and is complex in operation and more time-consuming.
The second measure solves the problems of complex operation and much time consumption in the first measure to a certain extent, the second measure is to manufacture a special retaining device and reserve a hole on the pipe segment of the pipe, when the jack needs to be retracted in order to increase the pipe segment of the pipe, one end of a retaining pin is fixed on the retaining device, and the other end of the retaining pin is inserted into the reserved hole of the pipe segment so as to achieve the purpose of retaining. However, in the second measure, a retaining pin hole is reserved on the pipe-jacking segment, and the retaining pin hole is formed in the pipe-jacking segment, so that larger concentrated stress is generated in the surrounding area of the retaining pin hole, and the pipe-jacking is broken.
In the prior art, in order to prevent the pipe joint from being propped against the pipe joint through a plurality of arc plates and the pipe joint, the pipe joint is prevented from backing up through friction force, however, the contact area of the propping plate and the pipe joint is larger for increasing the friction force under a stratum with high water pressure, but in order to prop against the pipe joint with different sizes, the pipe joint cannot be completely wrapped by the propping plate, so that the friction force between the propping plate and the pipe joint is insufficient to balance the backing force of the pipe joint, and the propping plate in the prior art is very troublesome to assemble and disassemble, inconvenient for constructors to use, and the efficiency of construction is reduced.
Therefore, the pipe jacking construction stopping device suitable for the stratum with high water pressure and high water permeability is provided to solve the problems.
Disclosure of Invention
The invention aims to solve the problems of insufficient friction force between a retaining plate and a pipe joint, inconvenient installation of the retaining plate and the like in the prior art, and provides a pipe jacking construction retaining device suitable for high-water-pressure and high-water-permeability strata.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the pipe jacking construction retaining device suitable for the stratum with high water pressure and high water permeability comprises a plurality of groups of first telescopic pieces distributed along the circumferential direction of a construction opening; a second telescopic member; each group of the first telescopic pieces are respectively provided with a first clamping device for clamping the jacking pipe body; the first clamping device comprises: the pipe jacking device comprises a fixed rod connected with the first telescopic piece, a first bolt connected with the fixed rod in a threaded mode, an adjusting piece used for driving the first bolt, and a first abutting piece connected with the first bolt and used for being in contact with the pipe jacking body.
Preferably, the second clamping device includes: the rotary rod is rotationally connected with the second telescopic piece, the sleeve is rotationally connected with one end of the rotary rod away from the second telescopic piece, the bevel gear is connected with the sleeve, the fixed sleeve is rotationally connected with the sleeve, the fixed sleeve is provided with a bevel gear ring matched with the bevel gear, a third threaded rod matched with the bevel gear, and a second abutting piece connected with the third threaded rod.
Preferably, a protective sleeve is connected to the sleeve, and the protective sleeve is in threaded connection with the third threaded rod; the third threaded rod is in transmission connection with the bevel gear through a square rod.
Preferably, the first telescopic member includes: the first threaded rod is connected with the first clamping device through a first threaded cylinder; the direction of the threads arranged on the surface of the first threaded rod is opposite to the direction of the threads arranged on the surface of the first fixing bolt.
Preferably, the second telescopic member includes: the second fixing bolt, through the second screw section of thick bamboo with the second threaded rod of second fixing bolt connection, the one end that the second threaded rod kept away from the second screw section of thick bamboo is equipped with the second clamping device.
Preferably, the adjusting member includes a first gear connected with one end of the first bolt facing away from the first abutting member, a gear post rotatably connected with the fixing rod, the gear post being matched with the first gear, and a first rotating handle connected with the gear post.
Preferably, one end of each third threaded rod, which is close to the square rod, is fixedly connected with a sliding block; the sliding blocks are in sliding connection with the fixing sleeves.
Preferably, one end of each fixing rod far away from the first threaded rod is fixedly connected with a supporting block through a second bolt; the abutting blocks are used for abutting against the jacking pipe body.
Preferably, the first pressing plate is connected with the first bolt, and the first retaining plate is connected with one end, far away from the first bolt, of the first pressing plate.
Preferably, the second fixing bolt is arranged at a position, away from the side wall of the first fixing bolt, of the working well, close to the position opposite to the center of the construction opening.
Compared with the prior art, the invention has the beneficial effects that:
the clamping force can be applied to the jacking pipe from the outside of the jacking pipe body through the first clamping device, and the clamping force can be applied from the inside of the jacking pipe body through the second clamping device, so that the contact area between the whole retaining device and the jacking pipe body is larger, the static friction force between the jacking pipe body and the retaining device is enlarged, the whole retaining device can effectively fix the jacking pipe body, meanwhile, the forces applied by the first clamping device and the second clamping device can act on the jacking pipe body in the same direction, the deformation trend of the jacking pipe body is avoided, and the working strength of the whole retaining device can be not too high due to the fact that the static friction force is increased by increasing the contact area between the whole retaining device and the jacking pipe body, so that the service life of the retaining device is prolonged;
the gear column can drive a plurality of first gears to rotate simultaneously, so that the first abutting plate moves downwards to abut against the pipe jacking body, the installation speed of workers can be increased, the construction efficiency is improved, the pipe jacking body can be abutted in advance through a plurality of abutting blocks, the pipe jacking body is prevented from backing up, the second clamping device is convenient to install, the pipe joint can be conveniently increased, the sliding block can abut against the protective sleeve, and the third threaded rod is prevented from sliding out of the protective sleeve.
Drawings
FIG. 1 is a schematic structural view of a pipe jacking construction stopping device suitable for high water pressure and high water permeability strata;
FIG. 2 is a schematic diagram of the structure at A in FIG. 1;
FIG. 3 is a schematic structural view of a retaining device retaining plate and a gear for pipe jacking construction, which is suitable for high water pressure and high water permeability strata;
fig. 4 is a schematic structural view of a second clamping device of a pipe jacking construction retaining device, which is suitable for high water pressure and high water permeability stratum, and the like;
fig. 5 is a schematic diagram of the structure at B in fig. 4.
In the figure: 1 working well, 2 pipe jacking body, 3 first fixing bolt, 4 second fixing bolt, 5 first screw thread section of thick bamboo, 6 first threaded rod, 7 fixed pads, 8 dead lever, 9 first bolt, 10 first clamp plate, 11 first butt plate, 12 first gear, 13 gear post, 14 first rotation handle, 15 second screw thread section of thick bamboo, 16 second rotation handle, 17 bull stick, 18 second threaded rod, 19 sleeve pipe, 20 fixed cover, 21 bevel gear, 22 awl ring, 23 square pole, 24 third threaded rod, 25 lag, 26 second clamp plate, 27 second butt plate, 28 butt piece.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
Referring to fig. 1-5, a pipe jacking construction stopping device suitable for high water pressure and high water permeability stratum comprises a working well 1 and a pipe jacking body 2, wherein a construction opening matched with the pipe jacking body 2 is formed in the side wall of the working well 1, a plurality of first fixing bolts 3 are circumferentially distributed around the construction opening, each first fixing bolt 3 is connected with a first threaded cylinder 5 through threaded rotation, one end of each first threaded cylinder 5 far away from the first fixing bolt 3 is connected with a first threaded rod 6 through threaded rotation, the direction of the first threaded rod 6 is opposite to that of the first fixing bolt 3, one end of each first threaded rod 6 far away from the first threaded cylinder 5 is fixedly connected with a first clamping device, a second fixing bolt 4 is fixedly connected to the position, close to the center of the construction opening, of the side wall of the working well 1, of the second fixing bolt 4 is fixedly connected with a second threaded cylinder 15 through threaded rotation, one end of the second threaded cylinder 15 far away from the second fixing bolt 4 is connected with a second threaded rod 18 through threaded rotation, and one end of the second threaded rod 18 far away from the second threaded cylinder 15 is provided with a second clamping device;
the clamping force can be applied to the jacking pipe from the outside of the jacking pipe body 2 through the first clamping device, the clamping force can be applied from the inside of the jacking pipe body 2 through the second clamping device, so that the contact area between the whole retaining device and the jacking pipe body 2 is larger, the static friction force between the jacking pipe body 2 and the retaining device is enlarged, the whole retaining device can effectively fix the jacking pipe body, meanwhile, the forces applied by the first clamping device and the second clamping device can act on the jacking pipe body 2 in the same large reverse direction, the deformation trend of the jacking pipe body 2 is avoided, and the working strength of the whole retaining device can be not too high due to the fact that the static friction force is increased by increasing the contact area between the whole retaining device and the jacking pipe body 2, so that the service life of the retaining device is prolonged;
each first clamping device comprises a fixing rod 8, the fixing rods 8 are fixedly connected with a first threaded rod 6, the side walls of the fixing rods 8 are fixedly connected with a plurality of fixing pads 7, each fixing pad 7 is provided with a plurality of threaded holes, each first threaded hole is connected with a first bolt 9 through threaded rotation, a plurality of first pressing plates 10 are fixedly connected with a plurality of first pressing plates 9, one section of each first pressing plate 10 far away from each first bolt 9 is fixedly connected with a first resisting plate 11, one end of each first pressing plate 9 far away from each first pressing plate 10 is fixedly connected with a first gear 12, one end of each fixing rod 8 far away from each first resisting plate 11 is rotationally connected with a gear column 13 matched with the corresponding first gear 12, one end of each gear column 13 far away from each fixing rod 8 is fixedly connected with a first rotating handle 14, one end of each fixing rod 8 far away from each first threaded rod 6 is fixedly connected with a resisting block 28 through a second bolt, and the resisting blocks 28 are abutted against the body 2;
the second clamping device comprises a rotating rod 17, the rotating rod 17 is rotationally connected with a second threaded rod 18 through a second rotating handle 16, one end, far away from the second threaded rod 18, of the rotating rod 17 is rotationally connected with a sleeve 19, the side wall of the sleeve 19 is rotationally connected with a plurality of bevel gears 21, one end, far away from the sleeve 19, of the rotating rod 17 is fixedly connected with a plurality of fixed sleeves 20, the plurality of fixed sleeves 20 are rotationally connected with the sleeve 19, one end, near to the bevel gears 21, of each fixed sleeve 20 is fixedly connected with a bevel ring 22 matched with the bevel gears 21, the side wall, far away from the sleeve 19, of each bevel gear 21 is fixedly connected with a square rod 23, each square rod 23 is slidingly connected with a third threaded rod 24 through a square groove, the side wall, near to the bevel gears 21, of the sleeve 19 is rotationally connected with a plurality of protective sleeves 25 through threads and a plurality of third threaded rods 24, one end, far away from the square rod 23, of the plurality of third threaded rods 24 is fixedly connected with a second pressing plate 26, one end, far away from the third threaded rods 24 is fixedly connected with a second pressing plate 27, one end, near to the square rod 23, of each third threaded rod 24 is fixedly connected with a sliding block, and a plurality of sliding blocks are fixedly connected with the sliding blocks, and the sliding blocks are fixedly connected with the sliding blocks;
the gear column 13 can drive the plurality of first gears 12 to rotate simultaneously, so that the first resisting plate 11 moves downwards to abut against the jacking pipe body 2, the installation speed of workers can be improved, the construction efficiency is improved, the jacking pipe body 2 can be abutted in advance through the plurality of resisting blocks 28, the jacking pipe body 2 is prevented from backing up, the second clamping device is conveniently installed, the plurality of resisting blocks 28 can be detached, a pipe joint is conveniently increased, the protecting sleeve 25 can be abutted through the sliding block, and the third threaded rod 24 is prevented from sliding out of the protecting sleeve 25.
In the present invention, the first telescopic member includes: a first fixing bolt 3 and a first threaded rod 6. The second telescoping member includes: a second fixing bolt 4 and a second threaded rod 18. The first abutment includes: a first pressing plate 10 and a first retaining plate 11. The second abutment includes: a second pressing plate 26 and a second retaining plate 27.
When the jack is used, the first clamping devices are connected with the first fixing bolts 3 through the first thread cylinders 5, the positions of the first retaining plates 11 against the jack body 2 are adjusted through the first thread cylinders 5, at the moment, the first retaining blocks 28 are firmly against the jack body 2, after connection is completed, the first rotating handles 14 are rotated, the first rotating handles 14 drive the gear columns 13 to rotate so as to drive the first gears 12 to rotate, the first gears 12 drive the first bolts 9 to rotate, so that the first bolts 9 gradually move, the first gears 12 can slide on the gear columns 13 without being disengaged, the first bolts 9 press the first retaining plates 11 against the jack body 2 through the first pressing plates 10, so that the first retaining plates 11 are firmly against the outer side walls of the jack body 2, at the moment, the primary jack body 2 is fixed, the jack is removed to install a pipe joint, and the second clamping device is installed after the pipe joint is opposite to the jack body 2;
the second thread cylinder 15 is connected with the second fixing bolt 4, the second clamping device can be opposite to the first clamping devices from the inside of the fixed pipe by adjusting the position of the second thread cylinder 15, the second abutting plate 27 is fixed after adjustment is finished, the second rotating handle 16 is rotated, the rotating rod 17 is driven to rotate, the rotating rod 17 drives the fixed sleeves 20 to rotate, the fixed sleeves 20 drive the bevel gears 21 to rotate through the bevel gears 22, the bevel gears 21 drive the third threaded rod 24 to rotate through the square rod 23 and the square groove, the third threaded rod 24 drives the second pressing plates 26 to expand outwards, the pressing plates drive the second abutting plates 27 to abut against the inner side wall of the pipe jacking body 2, the second bolts can be rotated, the second abutting blocks 28 are detached, the pipe joint abuts against the pipe jacking body 2, and therefore the pipe joint is increased. The pipe jacking body 2 can be clamped more firmly through the first clamping device and the second clamping device, and the pipe jacking body can be well stopped even in the terrain with high water pressure and water permeability.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (5)
1. The jacking pipe construction retaining device is suitable for high-water-pressure and high-water-permeability strata, and a plurality of groups of first telescopic pieces are distributed along the circumferential direction of a construction opening; a second telescopic member; each group of the first telescopic pieces are respectively provided with a first clamping device for clamping the jacking pipe body (2); the first clamping device comprises: the telescopic pipe jacking device comprises a fixed rod (8) connected with the first telescopic piece, a first bolt (9) in threaded connection with the fixed rod (8), an adjusting piece used for driving the first bolt (9) and a first abutting piece connected with the first bolt (9) and used for being in contact with the pipe jacking body (2), wherein the first abutting piece abuts against the outer side wall of the pipe jacking body (2);
the second clamping device comprises: the rotary rod (17) is rotationally connected with the second telescopic piece, the sleeve (19) is rotationally connected with one end, far away from the second telescopic piece, of the rotary rod (17), the bevel gear (21) is connected with the sleeve (19), the fixed sleeve (20) is connected with the rotary rod (17), the fixed sleeve (20) is provided with a bevel ring (22) matched with the bevel gear (21), a third threaded rod (24) matched with the bevel gear (21), and a second abutting piece connected with the third threaded rod (24), and the second abutting piece abuts against the inner side wall of the jacking pipe body (2);
a protective sleeve (25) is connected to the sleeve (19), and the protective sleeve (25) is in threaded connection with the third threaded rod (24); the third threaded rod (24) is in transmission connection with the bevel gear (21) through a square rod (23);
the first telescoping member includes: the first fixing bolt (3) is arranged at the construction opening, the first threaded rod (6) is connected with the first fixing bolt (3) through the first threaded cylinder (5), and the first threaded rod (6) is connected with the first clamping device; the direction of the threads arranged on the surface of the first threaded rod (6) is opposite to the direction of the threads arranged on the surface of the first fixing bolt (3);
the second telescoping member includes: the second clamping device comprises a second fixing bolt (4) and a second threaded rod (18) connected with the second fixing bolt (4) through a second threaded cylinder (15), wherein one end of the second threaded rod (18) far away from the second threaded cylinder (15) is provided with the second clamping device;
the adjusting piece comprises a plurality of first gears (12) connected with one ends of the first bolts (9) deviating from the first abutting pieces, a gear column (13) rotationally connected with the fixed rod (8), the gear column (13) is matched with the plurality of first gears (12), and a first rotating handle (14) connected with the gear column (13).
2. The pipe-jacking construction stopping device suitable for high-water-pressure and high-water-permeability strata according to claim 1, wherein one end of each third threaded rod (24) close to the square rod (23) is fixedly connected with a sliding block; the sliding blocks are in sliding connection with the fixing sleeves (20).
3. The pipe jacking construction stopping device suitable for high water pressure and high water permeability stratum according to claim 2, wherein one end of each fixed rod (8) far away from the first threaded rod (6) is fixedly connected with a supporting block (28) through a second bolt; the plurality of abutting blocks (28) are used for abutting against the jacking pipe body (2).
4. The pipe-jacking construction stop device adapted to a high water pressure, water-permeable formation according to claim 3, wherein the first abutment member comprises: the first pressing plate (10) is connected with the first bolt (9), and the first retaining plate (11) is connected with one end, far away from the first bolt (9), of the first pressing plate (10).
5. The pipe-jacking construction stopping device suitable for high-water-pressure and high-water-permeability stratum according to claim 1, wherein the second fixing bolt (4) is arranged at a position, opposite to the center of a construction opening, of the side wall, far away from the first fixing bolt (3), of the working well (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110645826.3A CN113294160B (en) | 2021-06-10 | 2021-06-10 | Pipe jacking construction retaining device suitable for stratum with high water pressure and high water permeability |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110645826.3A CN113294160B (en) | 2021-06-10 | 2021-06-10 | Pipe jacking construction retaining device suitable for stratum with high water pressure and high water permeability |
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| Publication Number | Publication Date |
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| CN113294160A CN113294160A (en) | 2021-08-24 |
| CN113294160B true CN113294160B (en) | 2023-04-25 |
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| CN110434779A (en) * | 2019-08-12 | 2019-11-12 | 湘潭大学 | A kind of bi-directional adjustable fixture |
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| CN111927529A (en) * | 2020-09-11 | 2020-11-13 | 中煤科工集团重庆研究院有限公司 | Hole sealing device and external member for downlink pressure measurement drilling and use method of hole sealing device and external member |
| CN112519900A (en) * | 2020-12-08 | 2021-03-19 | 陈美珠 | Can improve new energy automobile fin of curved ability of crossing |
| CN212802552U (en) * | 2020-05-12 | 2021-03-26 | 耿嘉翊 | Water supply and drainage heating and ventilation reserved sleeve device |
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2021
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|---|---|---|---|---|
| JP2002364289A (en) * | 2001-06-06 | 2002-12-18 | Kidoh Construction Co Ltd | Device and propulsion pipe for preventing backing |
| JP2003227290A (en) * | 2002-01-31 | 2003-08-15 | Kidoh Construction Co Ltd | Shift preventing device for embedded pipe line in jacking method |
| CN103244126A (en) * | 2013-04-12 | 2013-08-14 | 上海交通大学 | Construction method for preventing retreat of pipe pushing machine and pipe joints |
| CN104907970A (en) * | 2015-07-05 | 2015-09-16 | 冯圣冰 | Variable-diameter fixture for circular ring |
| CN110434779A (en) * | 2019-08-12 | 2019-11-12 | 湘潭大学 | A kind of bi-directional adjustable fixture |
| CN211422652U (en) * | 2019-12-12 | 2020-09-04 | 中电建生态环境集团有限公司 | Urban rock stratum muddy water balance pipe jacking device |
| CN212802552U (en) * | 2020-05-12 | 2021-03-26 | 耿嘉翊 | Water supply and drainage heating and ventilation reserved sleeve device |
| CN111502711A (en) * | 2020-05-26 | 2020-08-07 | 上海公路桥梁（集团）有限公司 | Seam sealing device between jacking pipe and tunnel well |
| CN111927529A (en) * | 2020-09-11 | 2020-11-13 | 中煤科工集团重庆研究院有限公司 | Hole sealing device and external member for downlink pressure measurement drilling and use method of hole sealing device and external member |
| CN112519900A (en) * | 2020-12-08 | 2021-03-19 | 陈美珠 | Can improve new energy automobile fin of curved ability of crossing |
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| CN113294160A (en) | 2021-08-24 |
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