CN110778329A - Tunnel segment measuring element wire sealing device and using method thereof - Google Patents
Tunnel segment measuring element wire sealing device and using method thereof Download PDFInfo
- Publication number
- CN110778329A CN110778329A CN201911060656.1A CN201911060656A CN110778329A CN 110778329 A CN110778329 A CN 110778329A CN 201911060656 A CN201911060656 A CN 201911060656A CN 110778329 A CN110778329 A CN 110778329A
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- sleeve body
- sealing device
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- 238000007789 sealing Methods 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000012544 monitoring process Methods 0.000 claims abstract description 12
- 230000000694 effects Effects 0.000 claims abstract description 8
- 230000000452 restraining effect Effects 0.000 claims abstract description 3
- 239000004567 concrete Substances 0.000 claims description 15
- 239000000565 sealant Substances 0.000 claims description 9
- 239000004744 fabric Substances 0.000 claims description 7
- 239000011150 reinforced concrete Substances 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 238000001179 sorption measurement Methods 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 239000004698 Polyethylene Substances 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- -1 polyethylene Polymers 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 239000011241 protective layer Substances 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- 238000005259 measurement Methods 0.000 claims 4
- 238000009434 installation Methods 0.000 abstract description 7
- 238000012360 testing method Methods 0.000 abstract description 4
- 230000002349 favourable effect Effects 0.000 abstract description 2
- 238000010276 construction Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 238000009933 burial Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B13/00—Spanners; Wrenches
- B25B13/48—Spanners; Wrenches for special purposes
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
- E21D11/086—Methods of making concrete lining segments
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention provides a wire sealing device for a tunnel segment measuring element, which comprises a sleeve body and a screwing wrench, wherein the sleeve body is provided with a sleeve hole; the sleeve body comprises a hollow circular tube, the outer end and the inner end of the hollow circular tube are respectively provided with an external thread section and an internal thread section, and the outer end and the inner end of the hollow circular tube are respectively screwed with a thread cover and a thread plate; a plurality of wire holes corresponding to each other are arranged on the threaded cover and the threaded plate; the thread plate is also provided with a plurality of counter bores for screwing force application; the screwing wrench is provided with a plurality of positioning bolts corresponding to the counter bores. The screwing wrench comprises two hollow semicircular pipes which are matched with each other, the positioning bolt is arranged at the end part of each semicircular pipe, and the end parts of the two semicircular pipes are also provided with wire restraining grooves which are matched with each other. The tunnel segment measuring element wire sealing device provided by the invention is simple in installation and use method, easy to operate, firm and reliable in sealing, effectively improves the wire sealing effect, is favorable for smooth connection of the wire and the acquisition instrument, and ensures the success of a field monitoring test.
Description
Technical Field
The invention relates to the technical field of stress monitoring of a tunnel engineering segment structure, in particular to a sealing device for a tunnel segment measuring element wire and a using method thereof.
Background
Along with the rapid development of urban construction, underground space development is more and more emphasized, tunnel projects with reinforced concrete segment structures emerge in large numbers in the underground space development process, urban subways with shallow covering soil, mountain tunnels with large burial depth and underwater tunnels are mainly adopted, and in the tunnel project design and construction process, in order to solve the stress condition of the segment structures, the change rules of reinforcing steel bars and concrete are analyzed, the reliability of the tunnel structure design is verified, the stress monitoring on the segment structures needs to be carried out in the tunnel project construction and operation process, and the successful arrangement of measuring element wires in the segment structures with limited thickness is a key related to the success or failure of the whole test result.
A plurality of measuring elements that present section of jurisdiction structure monitoring used mainly are drawn forth the wire through injected hole and pre-buried pipe when the installation. When the lead is led out through the grouting hole, the grouting process and the plugging of the grouting hole in construction are influenced, and water leakage at the grouting hole is caused; when the wire is led out through the common embedded pipe, when the two ends of the embedded pipe are not sealed well, slurry can flow into the embedded pipe when concrete is poured, the wire is sealed in the embedded pipe, and the wire cannot be led out.
Disclosure of Invention
In order to overcome the technical problems, the invention provides a lead sealing device which has a plurality of seals and is convenient to install and capable of storing and connecting a plurality of measuring element leads and a using method thereof, which ensure that the leads are intact during concrete pouring and are quickly and hermetically installed after the pouring is finished, and the specific scheme is as follows:
a wire sealing device for a tunnel segment measuring element comprises a sleeve body and a screwing wrench; the sleeve body comprises a hollow circular tube, the outer end and the inner end of the hollow circular tube are respectively provided with an external thread section and an internal thread section, and the outer end and the inner end of the hollow circular tube are respectively screwed with a thread cover and a thread plate; a plurality of wire holes corresponding to each other are arranged on the threaded cover and the threaded plate; the thread plate is also provided with a plurality of counter bores for screwing force application; and a plurality of positioning bolts corresponding to the counter bores are arranged on the screwing wrench.
Based on the above, the end part of the internal thread section is provided with the check ring.
Based on the above, a first sealing ring is arranged between the thread plate and the retainer ring; and a second sealing ring is arranged between the bottom of the threaded cover and the end head of the hollow circular tube.
Based on the above, the spiral wrench comprises two hollow semicircular pipes which are matched with each other, the positioning bolt is arranged at the end parts of the semicircular pipes, and the end parts of the two semicircular pipes are also provided with wire restraining grooves which are matched with each other.
Based on the above, the sleeve body is made of polyethylene material; the outer diameter of the hollow circular tube is 50mm, and the wall thickness of the hollow circular tube is 5 mm; the wall thickness of the threaded cover and the threaded plate is 5 mm.
Based on the above, the length of the sleeve body is h-2/3a, wherein h is the thickness of the pipe piece, and a is the thickness of the concrete protective layer.
Based on the above-mentioned tunnel segment measuring element wire sealing device, its application method includes the following steps:
before the reinforced concrete segment is poured:
a. respectively penetrating the lead (2) provided with the measuring element (1) through the lead hole (13) of the threaded cover (4), and sealing the lead hole (13) by using waterproof sealant;
b. placing the second sealing ring (12) at the bottom of the threaded cover (4), screwing the threaded cover (4) at the outer end of the hollow circular tube (3) to enable the second sealing ring (12) to be attached to the end part of the hollow circular tube (3), sealing the matching part of the threaded cover (4) and the hollow circular tube (3) by using waterproof sealant, and storing redundant wires (2) in the hollow circular tube (3);
c. placing a first sealing ring (8) in an internal thread section (10) of a hollow circular tube (3), placing a positioning bolt (16) screwed with a spanner in a counter bore (14), and rotating the rotary spanner to enable a thread plate (5) to be screwed in the internal thread section (10) and enable the first sealing ring (8) and a check ring (11) to be attached together;
d. fixing the sleeve body between two stressed steel bars in the pipe piece, wherein the inner end of the hollow circular pipe (3) is flush with the inner edge of the pipe piece;
e. fixing a magnet (18) with adsorption effect on the end of the hollow circular tube (3) by using waterproof cloth (19), placing the steel reinforcement cage of the segment in a mold, and pouring concrete;
after the reinforced concrete segment is poured:
f. after the concrete reaches the standard age of 28 days, finding the position of the embedded sleeve body by utilizing the adsorption effect of a magnet (18), opening a waterproof cloth (19) to expose the end head of the hollow circular tube (3), and taking out the threaded plate (5) by utilizing the rotary wrench;
g. the lead (2) stored in the hollow circular tube (3) is connected with an external lead (2) through a waterproof joint (7);
h. sequentially enabling the connected lead (2) to pass through the lead hole (13) of the thread plate (5), and rotating the thread plate (5) and the lead (2) together anticlockwise for a plurality of circles;
i. clamping all the main wires (2) by using the wire (2) of two hollow semicircular tubes (15) forming the screwing wrench, inserting a positioning bolt (16) at the end part of the hollow semicircular tube (15) into the counter bore (14), rotating the screwing wrench clockwise, and screwing a threaded plate (5) into the hollow circular tube (3) to enable the first sealing ring (8) to be tightly attached to the check ring (11);
j. sealing a gap between a lead (2) and a lead hole (13) of the thread plate (5) and a matching part of the thread plate (5) and the hollow circular tube (3) by using waterproof sealant;
k. and the wire (2) led out through the wire (2) sealing device is connected with the acquisition instrument (6) to read the stress monitoring data of the segment structure.
Compared with the prior art, the invention has outstanding substantive characteristics and remarkable progress, and particularly has the following advantages:
the method not only realizes the quick installation and storage of the measuring element wire before the reinforced concrete segment is poured, improves the working efficiency, but also protects the wire from being damaged by concrete pouring, improves the success rate of sealing and installing the wire, and ensures the structural stability of the key step of field test monitoring; the pipe piece structure field monitoring lead sealing device provided by the invention reduces the difficulty of lead sealing protection and installation during concrete pouring, realizes the storage and protection of leads in a limited space, and realizes the purposes of monitoring the stress condition of a pipe piece structure, analyzing the change rule of reinforcing steel bars and concrete and verifying whether the design of a tunnel structure is reliable or not by utilizing a field monitoring test; the device is simple in installation and use method, easy to operate, firm and reliable in sealing, effectively improves the sealing effect of the wire, is favorable for the smooth connection of the wire and the acquisition instrument, and ensures the successful monitoring of the segment structure.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
FIG. 2 is a sectional view showing the fitting structure of the sleeve body with the magnet and the tarpaulin in the sheet tube according to the present invention.
Fig. 3 is a sectional view of a hollow round tube in the present invention.
Fig. 4 is a front view of the sleeve body of the present invention.
Fig. 5 is a left side view of the sleeve body of the present invention. .
Fig. 6 is a right side view of the sleeve body of the present invention.
Fig. 7 is a front view of the sealing cover of the present invention.
Fig. 8 is a sectional view taken along a-a of fig. 7.
Fig. 9 is a front view of a sealing plate of the present invention.
Fig. 10 is a sectional view taken along the direction B-B of fig. 9.
Fig. 11 is a sectional view taken along the direction C-C of fig. 9.
Fig. 12 is a sectional view showing the entire structure of the rotary wrench of the present invention.
Fig. 13 is a cross-sectional view of fig. 12 taken along the direction D-D.
In the figure: 1. a measuring element; 2. a wire; 3. a hollow circular tube; 4. a threaded cap; 5. a thread plate; 6. an acquisition instrument; 7. a waterproof joint; 8. a first seal ring; 9, an external thread section; 9-1. a first thread segment; 10, an internal thread section; 10-1. a second thread segment; a retainer ring; 12. a second seal ring; 13. a wire guide hole; 14. a counter bore; 15. a semicircular tube; 16. positioning bolts; 17. a wire restraint slot; 18. a magnet; 19. a waterproof cloth.
Detailed Description
The technical solution of the present invention is further described in detail by the following embodiments.
Examples
As shown in fig. 1 to 13, the invention provides a sealing device for a tunnel segment measuring element wire 2, which comprises a sleeve body and a screwing wrench.
The sleeve body comprises a hollow circular tube 3, an external thread section 9 and an internal thread section 10 are respectively arranged at the outer end and the inner end of the hollow circular tube 3, and a thread cover 4 with a first thread section 9-1 and a thread plate 5 with a second thread section 10-1 are respectively screwed at the outer end and the inner end of the hollow circular tube 3 in order to conveniently seal two ends of the hollow circular tube 3.
The thread cover 4 and the thread plate 5 are provided with a plurality of wire guides 13 corresponding to each other.
In order to facilitate the matching installation of the thread plate 5 and the hollow circular tube 3, a plurality of counter bores 14 for force application are arranged on the thread plate 5 in a screwing mode.
For limiting the installation position of the thread plate 5, the end of the internal thread section 10 is provided with a retaining ring 11.
In order to improve the closure of the matching part of the threaded cover 4, the threaded plate 5 and the hollow circular tube 3, a first sealing ring 8 is arranged between the threaded plate 5 and the retainer ring 11, and a second sealing ring 12 is arranged between the bottom of the threaded cover 4 and the end of the hollow circular tube 3.
The length of the sleeve body is h-2/3a, wherein h is the thickness of the pipe piece, and a is the thickness of the concrete protective layer.
In view of the use position of the sealing device, in order to ensure the service life of the sealing device, the sleeve body is made of polyethylene (PE 100 grade). The outer diameter of the hollow circular tube 3 is 50mm, and the wall thickness of the hollow circular tube 3 is 5 mm; the wall thickness of the threaded cover 4 and the threaded plate 5 is 5 mm.
The screwing wrench comprises two hollow semicircular pipes 15 which are matched with each other, a plurality of positioning bolts 16 corresponding to the counter bores 14 are arranged at the end part of the screwing wrench, and rotating torque can be applied to the thread plate 5 by rotating the screwing wrench.
It is noted that the ends of the two semicircular tubes 15 are also provided with wire restraint grooves 17 that mate with each other.
According to the sealing device for the tunnel segment measuring element lead, the using method comprises the following steps:
a. respectively penetrating the lead (2) provided with the measuring element (1) through the lead hole (13) of the threaded cover (4), and sealing the lead hole (13) by using waterproof sealant;
b. placing the second sealing ring (12) at the bottom of the threaded cover (4), screwing the threaded cover (4) at the outer end of the hollow circular tube (3) to enable the second sealing ring (12) to be attached to the end part of the hollow circular tube (3), sealing the matching part of the threaded cover (4) and the hollow circular tube (3) by using waterproof sealant, and storing redundant wires (2) in the hollow circular tube (3);
c. placing a first sealing ring (8) in an internal thread section (10) of a hollow circular tube (3), placing a positioning bolt (16) screwed with a spanner in a counter bore (14), and rotating the rotary spanner to enable a thread plate (5) to be screwed in the internal thread section (10) and enable the first sealing ring (8) and a check ring (11) to be attached together;
d. fixing the sleeve body between two stressed steel bars in the pipe piece, wherein the inner end of the hollow circular pipe (3) is flush with the inner edge of the pipe piece;
e. fixing a magnet (18) with adsorption effect on the end of the hollow circular tube (3) by using waterproof cloth (19), placing the steel reinforcement cage of the segment in a mold, and pouring concrete;
after the reinforced concrete segment is poured:
f. after the concrete reaches the standard age of 28 days, finding the position of the embedded sleeve body by utilizing the adsorption effect of a magnet (18), opening a waterproof cloth (19) to expose the end head of the hollow circular tube (3), and taking out the threaded plate (5) by utilizing the rotary wrench;
g. the lead (2) stored in the hollow circular tube (3) is connected with an external lead (2) through a waterproof joint (7);
h. sequentially enabling the connected lead (2) to pass through the lead hole (13) of the thread plate (5), and rotating the thread plate (5) and the lead (2) together anticlockwise for a plurality of circles;
i. clamping all the main wires (2) by using the wire (2) of two hollow semicircular tubes (15) forming the screwing wrench, inserting a positioning bolt (16) at the end part of the hollow semicircular tube (15) into the counter bore (14), rotating the screwing wrench clockwise, and screwing a threaded plate (5) into the hollow circular tube (3) to enable the first sealing ring (8) to be tightly attached to the check ring (11);
j. sealing a gap between a lead (2) and a lead hole (13) of the thread plate (5) and a matching part of the thread plate (5) and the hollow circular tube (3) by using waterproof sealant;
k. and the wire (2) led out through the wire (2) sealing device is connected with the acquisition instrument (6) to read the stress monitoring data of the segment structure.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (7)
1. The utility model provides a tunnel segment measuring element wire sealing device which characterized in that: comprises a sleeve body and a rotary wrench; the sleeve comprises a sleeve body and a sleeve body, wherein the sleeve body comprises a hollow circular tube (3), the outer end and the inner end of the hollow circular tube (3) are respectively provided with an external thread section (9) and an internal thread section (10), and the outer end and the inner end of the hollow circular tube (3) are respectively screwed with a thread cover (4) and a thread plate (5); a plurality of wire holes (13) corresponding to each other are arranged on the threaded cover (4) and the threaded plate (5); the thread plate (5) is also provided with a plurality of counter bores (14) for screwing force application; the screwing wrench is provided with a plurality of positioning bolts (16) corresponding to the counter bores (14).
2. The tunnel segment measurement element wire sealing device of claim 1, wherein: the end part of the internal thread section (10) is provided with a retainer ring (11).
3. The tunnel segment measurement element wire sealing device of claim 2, wherein: a first sealing ring (8) is arranged between the thread plate (5) and the retainer ring (11); and a second sealing ring (12) is arranged between the bottom of the threaded cover (4) and the end head of the hollow circular tube (3).
4. The tunnel segment measurement element wire sealing device of claim 3, wherein: the screwing wrench comprises two hollow semicircular pipes (15) which are matched with each other, the positioning bolt (16) is arranged at the end part of each semicircular pipe (15), and the end parts of the two semicircular pipes (15) are also provided with wire restraining grooves (17) which are matched with each other.
5. The tunnel segment measurement element wire sealing device of claim 4, wherein: the sleeve body is made of polyethylene material; the outer diameter of the hollow circular tube (3) is 50mm, and the wall thickness of the hollow circular tube (3) is 5 mm; the wall thicknesses of the threaded cover (4) and the threaded plate (5) are both 5 mm.
6. The tunnel segment measuring element wire sealing device of any one of claims 1-5, wherein: the length of the sleeve body is h-2/3a, wherein h is the thickness of the pipe piece, and a is the thickness of the concrete protective layer.
7. The method of using a tunnel segment measuring element wire sealing device of claim 6, comprising the steps of:
before the reinforced concrete segment is poured:
a. respectively penetrating the lead (2) provided with the measuring element (1) through the lead hole (13) of the threaded cover (4), and sealing the lead hole (13) by using waterproof sealant;
b. placing the second sealing ring (12) at the bottom of the threaded cover (4), screwing the threaded cover (4) at the outer end of the hollow circular tube (3) to enable the second sealing ring (12) to be attached to the end part of the hollow circular tube (3), sealing the matching part of the threaded cover (4) and the hollow circular tube (3) by using waterproof sealant, and storing redundant wires (2) in the hollow circular tube (3);
c. placing a first sealing ring (8) in an internal thread section (10) of a hollow circular tube (3), placing a positioning bolt (16) screwed with a spanner in a counter bore (14), and rotating the rotary spanner to enable a thread plate (5) to be screwed in the internal thread section (10) and enable the first sealing ring (8) and a check ring (11) to be attached together;
d. fixing the sleeve body between two stressed steel bars in the pipe piece, wherein the inner end of the hollow circular pipe (3) is flush with the inner edge of the pipe piece;
e. fixing a magnet (18) with adsorption effect on the end of the hollow circular tube (3) by using waterproof cloth (19), placing the steel reinforcement cage of the segment in a mold, and pouring concrete;
after the reinforced concrete segment is poured:
f. after the concrete reaches the standard age of 28 days, finding the position of the embedded sleeve body by utilizing the adsorption effect of a magnet (18), opening a waterproof cloth (19) to expose the end head of the hollow circular tube (3), and taking out the threaded plate (5) by utilizing the rotary wrench;
g. the lead (2) stored in the hollow circular tube (3) is connected with an external lead (2) through a waterproof joint (7);
h. sequentially enabling the connected lead (2) to pass through the lead hole (13) of the thread plate (5), and rotating the thread plate (5) and the lead (2) together anticlockwise for a plurality of circles;
i. clamping all the main wires (2) by using the wire (2) of two hollow semicircular tubes (15) forming the screwing wrench, inserting a positioning bolt (16) at the end part of the hollow semicircular tube (15) into the counter bore (14), rotating the screwing wrench clockwise, and screwing a threaded plate (5) into the hollow circular tube (3) to enable the first sealing ring (8) to be tightly attached to the check ring (11);
j. sealing a gap between a lead (2) and a lead hole (13) of the thread plate (5) and a matching part of the thread plate (5) and the hollow circular tube (3) by using waterproof sealant;
k. and the wire (2) led out through the wire (2) sealing device is connected with the acquisition instrument (6) to read the stress monitoring data of the segment structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911060656.1A CN110778329B (en) | 2019-11-01 | 2019-11-01 | Tunnel segment measuring element wire sealing device and using method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911060656.1A CN110778329B (en) | 2019-11-01 | 2019-11-01 | Tunnel segment measuring element wire sealing device and using method thereof |
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| Publication Number | Publication Date |
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| CN110778329A true CN110778329A (en) | 2020-02-11 |
| CN110778329B CN110778329B (en) | 2021-05-18 |
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| CN111244859A (en) * | 2020-03-05 | 2020-06-05 | 长江水利委员会长江科学院 | Device and method for embedding monitoring cable in diversion tunnel lining |
| CN111276915B (en) * | 2020-03-13 | 2021-01-29 | 中铁隧道局集团有限公司 | Tunnel construction is with monitoring components and parts cable protection device |
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| CN110778329B (en) | 2021-05-18 |
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