CN111119012B - Composite road building construction method - Google Patents
Composite road building construction method Download PDFInfo
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- CN111119012B CN111119012B CN201911332485.3A CN201911332485A CN111119012B CN 111119012 B CN111119012 B CN 111119012B CN 201911332485 A CN201911332485 A CN 201911332485A CN 111119012 B CN111119012 B CN 111119012B
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- road
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C21/00—Apparatus or processes for surface soil stabilisation for road building or like purposes, e.g. mixing local aggregate with binder
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Road Paving Structures (AREA)
Abstract
The invention relates to the technical field of road building technology, and discloses a composite road building construction method, which comprises the following steps: paving a biological enzyme road surface base layer on the working surface; after the biological enzyme pavement base is dried, cracks are formed on the surface of the biological enzyme pavement base; spraying road nailing slurry on the surface of the biological enzyme pavement base layer; filling the lower path nail slurry into cracks on the surface of the biological enzyme pavement base layer until the cracks are saturated to form a lower path nail layer; and spraying upper-path nail slurry on the surface of the lower-path nail layer to form an upper-path nail layer. The composite road construction method provided by the technical scheme of the invention improves the durability of the road.
Description
Technical Field
The invention relates to the technical field of road building technology, in particular to a composite road building construction method.
Background
The road is an infrastructure for various trackless vehicles and pedestrians to pass through, and along with the development of road construction technology, the construction of the road needs to be correspondingly constructed according to parameters such as road conditions and the like, so that the cost is saved to the maximum extent, and meanwhile, the long-term operation of the road is guaranteed.
In the prior art, a constructed road is generally in a single-layer homogeneous state, namely, various functional layers are sequentially listed on a roadbed, so that a corresponding functional effect is achieved.
However, the above-mentioned road each layer does not influence each other, and the wholeness of road is relatively poor, and in the long-term use, durable relatively poor, breaks away from each other easily between each layer, and is extremely unstable.
Disclosure of Invention
The invention aims to provide a composite road construction method, and aims to solve the problem of poor road durability in the prior art.
The invention is realized in this way, a composite road construction method, comprising the following steps:
paving a biological enzyme road surface base layer on the working surface;
after the biological enzyme pavement base is dried, cracks are formed on the surface of the biological enzyme pavement base;
spraying road nailing slurry on the surface of the biological enzyme pavement base layer; filling the lower path nail slurry into cracks on the surface of the biological enzyme pavement base layer until the cracks are saturated to form a lower path nail layer;
and spraying upper-path nail slurry on the surface of the lower-path nail layer to form an upper-path nail layer.
Optionally, in the step of laying the bio-enzyme road base layer on the working surface:
spreading the biological enzyme solidified material on the working surface, and compacting the biological enzyme solidified material.
Optionally, before the step of spraying the road nail slurry on the surface of the biological enzyme road base layer:
checking whether the surface of the biological enzyme road surface base layer is in a clean and dry state;
when the surface of the biological enzyme pavement base is in a clean and dry state, spraying road-following nailing slurry on the surface of the biological enzyme pavement base;
when the surface of the biological enzyme pavement base is not in a clean state, removing dirt substances, dust and loose and semi-loose substances which are not firmly combined with the operation surface from the surface of the biological enzyme pavement base;
and when the surface of the biological enzyme road surface base layer is not in a dry state, continuously waiting.
Optionally, the step of spraying the road nail slurry on the surface of the biological enzyme road surface base layer comprises:
spraying the surface of the biological enzyme road surface base layer by using a submersible pump to enable the lower road nail slurry to cover the surface of the biological enzyme road surface base layer;
and after the lower road nail slurry is absorbed by the surface of the biological enzyme pavement base layer, timely supplementing and spraying until the lower road nail slurry is saturated.
Optionally, the cracks on the surface of the biological enzyme pavement base layer comprise wound surfaces when the surface of the biological enzyme pavement base layer is cleaned, and crack cracks formed on the surface of the biological enzyme pavement base layer are dried.
Optionally, the following road nail slurry comprises the following components: 32.5 cement, TB rubber powder, a medium A and a medium B, wherein the medium A and the medium B are high polymer materials.
Optionally, before the step of spraying the upper-path nail slurry on the surface of the lower-path nail layer:
checking whether the surface of the lower road stud layer is in a clean and dry state;
when the surface of the lower road nail layer is in a clean and dry state, spraying upper road nail slurry on the surface of the lower road nail layer;
when the surface of the lower road nail layer is not in a clean state, removing dirt substances, dust and loose and semi-loose substances which are not firmly combined with the biological enzyme pavement base layer from the surface of the lower road nail layer;
and when the surface of the lower road stud layer is not in a dry state, continuously waiting.
Optionally, in the step of spraying the upper-path nail slurry on the surface of the lower-path nail layer:
spraying the surface of a lower road nail layer by using a submersible pump to enable the upper road nail slurry to cover the surface of the lower road nail layer;
and filling cracks on the surface of the lower path nail layer until the cracks are saturated.
Optionally, the road nail slurry comprises the following components: 32.5 cement, TB rubber powder, a medium C, a medium D and a pigment, wherein the medium C and the medium D are high polymer materials.
Compared with the prior art, the composite road construction method provided by the invention has the advantages that the part of the lower road nailing slurry is filled in the crack of the biological enzyme pavement base layer, so that the part of the lower road nailing slurry is embedded with the biological enzyme pavement base layer, the lower road nailing layer is not easy to separate from the biological enzyme pavement base layer, on the basis of improving the durability of the road, the lower road nailing layer and the biological enzyme pavement base layer are combined into an integral composite layer, and the composite layer has the advantages of the biological enzyme pavement base layer and the lower road nailing layer, so that the whole road is more excellent. The problem of among the prior art, road durability is poor is solved.
Drawings
Fig. 1 is a construction flow chart of a composite road construction method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The following describes the implementation of the present invention in detail with reference to specific embodiments.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
The composite road building construction method provided by the invention improves the durability of the road.
Referring to fig. 1, a preferred embodiment of the present invention is shown.
In the embodiment of the invention, the composite road construction method comprises the following steps:
s10, paving a biological enzyme road surface base layer on the working surface;
the biological enzyme road surface base layer is a road building base layer which is formed by adding a biological enzyme curing material on a working surface and curing the biological enzyme curing material.
S20, after the bio-enzyme pavement base is dried, cracks are formed on the surface of the bio-enzyme pavement base;
the cracks referred to herein may be naturally occurring cracks or manually removed cracks, and generally, in order to form many cracks, sufficient drying is required; meanwhile, the biological enzyme pavement base layer also needs certain strength, so that the biological enzyme pavement base layer can adapt to larger and heavier equipment and carry out large-scale and quick construction operation.
S30, spraying road nailing slurry on the surface of the biological enzyme road surface base layer; filling cracks on the surface of the bio-enzyme pavement base layer with the lower-path nail slurry until the cracks are saturated to form a lower-path nail layer;
when the lower road nail slurry is sprayed, the lower road nail slurry is rolled into a plane to form a lower road nail layer, so that the subsequent construction operation is facilitated, and after the construction is finished, a certain time needs to be waited to enable the lower road nail layer to present certain strength, so that the construction is facilitated; and filling the cracks on the surface of the biological enzyme pavement base layer repeatedly until the cracks are filled, so that the next road nail slurry and the biological enzyme pavement base layer are fully compounded.
And S40, spraying upper-path nail slurry on the surface of the lower-path nail layer to form an upper-path nail layer.
The road spike layer is a coating layer, and is generally the surface of a road, namely the part which is in contact with a vehicle, so that when the road spike is sprayed, the road spike is rolled into a plane so as to facilitate the vehicle to walk.
In this embodiment, through filling the part of the nail thick liquid of next round in the crack department of biological enzyme road surface basic unit, thereby make the part of the nail thick liquid of next round and the gomphosis of biological enzyme road surface basic unit, the nail layer of next round is difficult for breaking away from with biological enzyme road surface basic unit, on the basis that has promoted this road durability, the nail layer of next round regards as a holistic heterogeneous composite bed with biological enzyme road surface basic unit, this composite bed has biological enzyme road surface basic unit's advantage concurrently, and the advantage on nail layer of next round, thereby make this road whole more excellent.
In an embodiment of the present invention, in step S10, the step of laying the bio-enzyme road base layer on the working surface includes:
spreading the biological enzyme solidified material on the working surface, and compacting the biological enzyme solidified material.
In this embodiment, the bio-enzyme solidified material is spread between the shoulders on both sides and is subjected to static pressure twice to mix the bio-enzyme solidified material with the working surface, thereby realizing solidification.
After the biological enzyme solidified material is compacted, paving broken stones on the working surface, and then rolling the broken stones by using a road roller with the length of more than 16T to embed the broken stones into the working surface; then, cement paste is spread on the working surface, so that the biological enzyme pavement base layer is obtained.
When the gravel is embedded into the working face, the gravel has a protruding part protruding out of the working face, so that cement paste is not easy to flow everywhere when the cement paste is paved on the working face, and the biological enzyme pavement base course is convenient to cure.
Thus, the obtained biological enzyme road surface base layer is fully compounded with the working surface, so that the biological enzyme road surface base layer is not easy to separate from the working surface and is more stable.
In addition, after the step of laying the bio-enzyme road base layer on the working surface:
carrying out primary water saturation curing on the surface of the biological enzyme pavement base, and waiting for 24-96 hours.
In the embodiment, the step of laying the biological enzyme pavement base is carried out on a sunny day, water is sprayed on the surface of the biological enzyme pavement base, vehicles are prohibited to pass through the biological enzyme pavement base for 24-96 hours, and the biological enzyme pavement base is exposed to sunlight, so that the biological enzyme pavement base is fully dried, superficial cracks formed on the surface are most abundant, and the initial strength is displayed, so that construction is facilitated. In order to avoid the influence of rainwater, a thin film needs to be covered on the surface of the biological enzyme road base layer, and the subsequent construction can be carried out until the biological enzyme road base layer is fully dried.
Referring to fig. 1, in one embodiment of the present invention, before the step of spraying the road nail slurry on the surface of the bio-enzyme road base layer:
checking whether the surface of the biological enzyme pavement base is in a clean and dry state;
when the surface of the biological enzyme pavement base is in a clean and dry state, spraying road-following nail slurry on the surface of the biological enzyme pavement base;
when the surface of the biological enzyme pavement base is not in a clean state, dirt substances, dust and loose and semi-loose substances which are not firmly combined with the operation surface are removed, wherein the loose and semi-loose substances which are not firmly combined with the operation surface are the parts separated from the biological enzyme pavement base, repair is not needed, and the biological enzyme pavement base can be further compounded by filling the removed substances through next nail slurry;
and when the surface of the biological enzyme road surface base layer is not in a dry state, continuously waiting.
The surface of biological enzyme road surface basic unit is under construction clean with dry state to make biological enzyme road surface basic unit and the abundant gomphosis each other of following nail thick liquid, and there is not impurity between the two, it is firm to depend on, and is durable more excellent.
In addition, the step of spraying the run-down nail slurry on the surface of the bio-enzyme road base layer includes:
spraying the surface of the biological enzyme pavement base layer by using a submersible pump to enable the lower road nail slurry to cover the surface of the biological enzyme pavement base layer;
this immersible pump hour flow is less than 2 cubes, like this, guarantees when the spraying nail thick liquid down that bio-enzyme road surface basic unit fully absorbs the nail thick liquid down, makes the two fully compound, and the nail thick liquid of the way covers bio-enzyme road surface basic unit's surface down simultaneously, forms the nail layer of the way down to in spraying nail thick liquid of going to.
And after the lower road nail slurry is absorbed by the surface of the biological enzyme pavement base, supplementing and spraying in time until the lower road nail slurry is saturated.
Therefore, the biological enzyme pavement base layer and the road-following nail slurry are fully compounded, and the overall durability and stability of the road are ensured.
In this embodiment, the cracks on the surface of the bio-enzyme pavement base include a wound surface when the surface of the bio-enzyme pavement base is cleaned, and a crack formed on the surface of the dry bio-enzyme pavement base.
That is, the wound surface, cracks, etc. on the surface of the bio-enzyme road base layer can be regarded as cracks in the embodiment, and can be manually removed as required, so that the cracks are all arranged on the surface of the bio-enzyme road base layer, that is, the cracks are arranged at each position of the bio-enzyme road base layer, so that the lower spike layer and each position of the bio-enzyme road base layer are stably attached and combined with each other, and thus, the lower spike slurry can be fully embedded with the bio-enzyme road base layer to realize the combination.
In one embodiment of the present invention, the following nail slurry comprises the following components: 32.5 cement, TB rubber powder, a medium A and a medium B, wherein the medium A and the medium B are high polymer materials.
The specific gravity of the 32.5 cement, the TB rubber powder, the medium A and the medium B is as follows: every 50kg of 32.5 cement is added with 1.4kg of TB rubber powder, 5g of medium A and 20g of medium B, the medium A and the medium B are additive materials, and different materials can be added according to different road conditions and requirements.
Referring to fig. 1, in an embodiment of the present invention, before the step of spraying the upper nail slurry on the surface of the lower nail layer:
checking whether the surface of the lower road nail layer is in a clean and dry state;
spraying upper-path nail slurry on the surface of the lower-path nail layer when the surface of the lower-path nail layer is in a clean and dry state;
when the surface of the lower road nail layer is not in a clean state, dirt substances and dust on the surface of the lower road nail layer, and loose and semi-loose substances which are not firmly combined with the surface of the biological enzyme pavement base layer are removed, wherein the loose and semi-loose substances which are not firmly combined with the surface of the biological enzyme pavement base layer are parts of the lower road nail layer which are separated from the surface of the biological enzyme pavement base layer, repair is not needed, and the lower road nail layer can be filled with upper road nail slurry after removal, so that compounding is further realized;
when the surface of the next road nail layer is not in a dry state, the waiting is continued.
Like this, guarantee to go up between spike layer and the lower spike layer impurity-free, the abundant joint guarantees stably and durable.
Specifically, in the step of spraying the upper-way nail slurry on the surface of the lower-way nail layer:
spraying the surface of the lower road nail layer by using a submersible pump to enable the upper road nail slurry to cover the surface of the lower road nail slurry;
and filling cracks on the surface of the lower path nail layer until the cracks are saturated.
The upper road nail slurry is fully embedded in the cracks of the lower road nail layer, the cracks comprise a wound surface when the surface of the lower road nail layer is cleaned and a crack formed on the surface of the lower road nail layer, and can be manually removed according to requirements, so that the cracks are all arranged on the surface of the lower road nail layer, the upper road nail layer and the lower road nail layer are laminated into an integral composite layer, the composite layer has the advantages of the lower road nail layer and the advantages of the upper road nail layer, and the lower road nail layer is embedded with the biological enzyme road base layer in combination, so that the whole road is more excellent and stable.
In addition, the composition of the road nail slurry is as follows: 32.5 cement, TB rubber powder, a medium C, a medium D and a pigment, wherein the medium C and the medium D are high polymer materials.
In this embodiment, the upper road nail slurry comprises the following components in percentage by weight: 2.8kg of TB rubber powder, 10g of medium C and 40g of medium D are added into every 100kg of 32.5 cement, and the cement equal concentration of the upper road nail slurry is more than that of the lower road nail slurry, so that the upper road nail layer which is frequently contacted with a vehicle has better wear resistance and is convenient for long-term use.
The medium C and the medium D can be dibenzylidene sorbitol and polybutadiene respectively, so that the waterproof performance of the upper spike layer is more excellent, the medium A and the medium B in the lower spike layer are polyethylene and styrene-butadiene-styrene block copolymers respectively, and the formed composite layer of the upper spike layer and the lower spike layer has both waterproof performance and high temperature resistance and is more excellent in use effect.
And pigment is added into the upper road nail slurry, so that the upper road nail slurry can present certain color, and the color can be changed as required to cater for different use positions.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. A composite road construction method is characterized by comprising the following steps:
paving a biological enzyme road surface base layer on the working surface;
after the biological enzyme pavement base is dried, cracks are formed on the surface of the biological enzyme pavement base;
spraying road nailing slurry on the surface of the biological enzyme pavement base layer; filling the lower path nail slurry into cracks on the surface of the biological enzyme pavement base layer until the cracks are saturated to form a lower path nail layer;
spraying upper road nail slurry on the surface of the lower road nail layer to form an upper road nail layer;
the step of laying the biological enzyme road surface base layer on the working surface comprises the following steps: spreading the biological enzyme curing material on an operation surface, and compacting the biological enzyme curing material; after the biological enzyme solidified material is compacted, paving broken stones on the working surface, and then rolling the broken stones by using a road roller to embed the broken stones into the working surface; spreading cement slurry on an operation surface to obtain the biological enzyme pavement base layer;
the road-feeding nail slurry comprises the following components: 32.5 cement, TB rubber powder, a medium C, a medium D and a pigment, wherein the medium C and the medium D are dibenzylidene sorbitol and polybutadiene respectively;
the road nail slurry comprises the following components in percentage by weight: 2.8kg of TB rubber powder, 10g of medium C and 40g of medium D are added to 100kg of 32.5 cement.
2. The method of claim 1, wherein the step of spraying a road-nailing slurry on the surface of the bio-enzyme road base layer is preceded by the steps of:
checking whether the surface of the biological enzyme road surface base layer is in a clean and dry state;
when the surface of the biological enzyme pavement base is in a clean and dry state, spraying road-following nailing slurry on the surface of the biological enzyme pavement base;
when the surface of the biological enzyme pavement base is not in a clean state, removing dirt substances, dust and loose and semi-loose substances which are not firmly combined with the operation surface from the surface of the biological enzyme pavement base;
and when the surface of the biological enzyme road surface base layer is not in a dry state, continuously waiting.
3. The method of claim 1, wherein said step of spraying a road-following grout on the surface of said bio-enzyme road base layer comprises:
spraying the surface of the biological enzyme road surface base layer by using a submersible pump to enable the lower road nail slurry to cover the surface of the biological enzyme road surface base layer;
and after the lower road nail slurry is absorbed by the surface of the biological enzyme pavement base layer, timely supplementing and spraying until the lower road nail slurry is saturated.
4. The method of claim 1, wherein the cracks in the bio-enzyme based surface include cleaning the wound surface and drying the cracks formed in the bio-enzyme based surface.
5. The composite road building construction method according to claim 1, wherein the road-following nail slurry comprises the following components: 32.5 cement, TB rubber powder, a medium A and a medium B, wherein the medium A is polyethylene, and the medium B is a styrene-butadiene-styrene block copolymer.
6. The composite road construction method according to claim 1, wherein the step of spraying the upper road-nailing slurry on the surface of the lower road-nailing layer is preceded by the steps of:
checking whether the surface of the lower road stud layer is in a clean and dry state;
when the surface of the lower road nail layer is in a clean and dry state, spraying upper road nail slurry on the surface of the lower road nail layer;
when the surface of the lower road nail layer is not in a clean state, removing dirt substances, dust and loose and semi-loose substances which are not firmly combined with the biological enzyme pavement base layer from the surface of the lower road nail layer;
and when the surface of the lower road stud layer is not in a dry state, continuously waiting.
7. The composite road building construction method according to claim 1, wherein in the step of spraying the upper road nailing slurry on the surface of the lower road nailing layer:
spraying the surface of a lower road nail layer by using a submersible pump to enable the upper road nail slurry to cover the surface of the lower road nail layer;
and filling cracks on the surface of the lower path nail layer until the cracks are saturated.
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| CN201911332485.3A CN111119012B (en) | 2019-12-22 | 2019-12-22 | Composite road building construction method |
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| CN201911332485.3A CN111119012B (en) | 2019-12-22 | 2019-12-22 | Composite road building construction method |
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| CN111119012B true CN111119012B (en) | 2021-12-24 |
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| CN103882788A (en) * | 2014-03-12 | 2014-06-25 | 湖南瑞霦科技有限公司 | Road building method based on modified roller compacted concrete pavement on enzyme soil solidified base layer |
| CN106087637A (en) * | 2016-08-08 | 2016-11-09 | 广东工业大学 | The repairing structure of a kind of cement concrete pavement and method |
| CN207846123U (en) * | 2017-07-26 | 2018-09-11 | 北京中航空港建设工程有限公司 | Reinforced structure complex |
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2019
- 2019-12-22 CN CN201911332485.3A patent/CN111119012B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1356431A (en) * | 2001-11-29 | 2002-07-03 | 蒋新明 | Road bed without reflected cracks on asphalt pavement and its building method |
| CN100999894A (en) * | 2006-12-25 | 2007-07-18 | 西安公路养护技术工程研究中心 | Cement concrete bridge surface synchronous breakstone water-proof binding composite layer and construction method thereof |
| CN201109894Y (en) * | 2007-08-06 | 2008-09-03 | 杨毅男 | Road structure made using soil solidifying agent |
| CN202031025U (en) * | 2011-04-08 | 2011-11-09 | 重庆市智翔铺道技术工程有限公司 | Pavement structure for steel deck |
| CN102619157A (en) * | 2012-04-19 | 2012-08-01 | 招商局重庆交通科研设计院有限公司 | Method for repairing and constructing thin overlay of cement concrete road pavement |
| CN103882788A (en) * | 2014-03-12 | 2014-06-25 | 湖南瑞霦科技有限公司 | Road building method based on modified roller compacted concrete pavement on enzyme soil solidified base layer |
| CN106087637A (en) * | 2016-08-08 | 2016-11-09 | 广东工业大学 | The repairing structure of a kind of cement concrete pavement and method |
| CN207846123U (en) * | 2017-07-26 | 2018-09-11 | 北京中航空港建设工程有限公司 | Reinforced structure complex |
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| CN111119012A (en) | 2020-05-08 |
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