CN114197915A - Roofing minimally invasive self-healing waterproof method - Google Patents
Roofing minimally invasive self-healing waterproof method Download PDFInfo
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- CN114197915A CN114197915A CN202210030154.XA CN202210030154A CN114197915A CN 114197915 A CN114197915 A CN 114197915A CN 202210030154 A CN202210030154 A CN 202210030154A CN 114197915 A CN114197915 A CN 114197915A
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- roof
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- healing
- heat
- waterproof
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 36
- 239000000463 material Substances 0.000 claims description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 16
- 238000009413 insulation Methods 0.000 claims description 14
- 239000000741 silica gel Substances 0.000 claims description 13
- 229910002027 silica gel Inorganic materials 0.000 claims description 13
- 239000004568 cement Substances 0.000 claims description 12
- 229920000642 polymer Polymers 0.000 claims description 11
- 239000011248 coating agent Substances 0.000 claims description 7
- 238000000576 coating method Methods 0.000 claims description 7
- 239000010451 perlite Substances 0.000 claims description 4
- 235000019362 perlite Nutrition 0.000 claims description 4
- 239000004576 sand Substances 0.000 claims description 3
- 238000004078 waterproofing Methods 0.000 claims description 3
- 230000008439 repair process Effects 0.000 abstract description 10
- 230000000694 effects Effects 0.000 description 16
- 238000004321 preservation Methods 0.000 description 9
- 238000010276 construction Methods 0.000 description 4
- 239000003292 glue Substances 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 229910001562 pearlite Inorganic materials 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002178 crystalline material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0203—Arrangements for filling cracks or cavities in building constructions
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
- E04D11/00—Roof covering, as far as not restricted to features covered by only one of groups E04D1/00 - E04D9/00; Roof covering in ways not provided for by groups E04D1/00 - E04D9/00, e.g. built-up roofs, elevated load-supporting roof coverings
- E04D11/02—Build-up roofs, i.e. consisting of two or more layers bonded together in situ, at least one of the layers being of watertight composition
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
- E04D13/00—Special arrangements or devices in connection with roof coverings; Protection against birds; Roof drainage ; Sky-lights
- E04D13/04—Roof drainage; Drainage fittings in flat roofs, balconies or the like
- E04D13/064—Gutters
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
- E04D13/00—Special arrangements or devices in connection with roof coverings; Protection against birds; Roof drainage ; Sky-lights
- E04D13/14—Junctions of roof sheathings to chimneys or other parts extending above the roof
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
- E04D13/00—Special arrangements or devices in connection with roof coverings; Protection against birds; Roof drainage ; Sky-lights
- E04D13/16—Insulating devices or arrangements in so far as the roof covering is concerned, e.g. characterised by the material or composition of the roof insulating material or its integration in the roof structure
- E04D13/1606—Insulation of the roof covering characterised by its integration in the roof structure
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0203—Arrangements for filling cracks or cavities in building constructions
- E04G23/0211—Arrangements for filling cracks or cavities in building constructions using injection
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0281—Repairing or restoring roofing or roof covering
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
- E04D13/00—Special arrangements or devices in connection with roof coverings; Protection against birds; Roof drainage ; Sky-lights
- E04D13/14—Junctions of roof sheathings to chimneys or other parts extending above the roof
- E04D2013/1422—Parapet building elements for retaining the roof flashing
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Mechanical Engineering (AREA)
- Working Measures On Existing Buildindgs (AREA)
- Roof Covering Using Slabs Or Stiff Sheets (AREA)
Abstract
The invention discloses a minimally invasive self-healing waterproof method for a roof, which comprises the following steps: a grouting hole is formed in the floor slab and extends into the heat-insulating layer; grouting the area to be repaired of the heat-insulating layer through the grouting hole; continuously injecting the mortar, wherein the mortar enters between the heat-insulating layer and the waterproof layer along a leakage channel in the area to be repaired of the heat-insulating layer and enters between the roof and the waterproof layer through a waterproof layer crack; the mortar enters the roof cracks to finish plugging the roof cracks; according to the invention, the grouting holes are formed in the floor slab and the heat-insulating layer and grouting is carried out in the grouting holes, so that the repair of the leakage channel in the to-be-repaired area of the heat-insulating layer is completed, and the problems of time consumption and labor consumption caused by large-scale dismantling of the waterproof heat-insulating structure are avoided; in addition, mortar conveyed by means of the leakage channel can enter the cracks of the roof, so that the cracks of the roof can be repaired, and the problem of roof leakage is solved by means of minimally invasive measures.
Description
Technical Field
The invention relates to the technical field of building waterproofing, in particular to a minimally invasive self-healing waterproof method for a roof.
Background
Roof waterproofing is always a big problem, similar to the world problem; once leakage occurs, the difficulty of maintenance sometimes makes various methods difficult to work, hurts people and brings much trouble and influence to production and life of enterprises and people.
The existing waterproof structure system is as follows: roof coiled material waterproof layer + pearlite heat preservation + floor board, but there is this following problem:
1) the coiled material is waterproof, is difficult to be airtight, especially has long time, and some places are easy to be empty, and water can permeate out from the gap between the coiled material and the roof and flow between the coiled material and the roof. When the roof cracks, water can seep through the cracks to cause leakage.
2) The heat preservation generally uses the pearlite heated board, though has good heat preservation effect, but inside is loose again, and water in case the invasion becomes the ponding layer easily, uses the roof heat preservation of this kind of structure at present to actually form a cistern. The water stored in the inner side permeates through the coiled material and continuously seeps down along the gap on the roof plate, so that the prevention is not sufficient.
3) The waterproof coiled material generally extends to a parapet wall during construction, has limited waterproof effect, is passive physical waterproof, and is supposed to prevent water from invading through the coiled material, so that the waterproof coiled material cannot be practically used. The coiled material adhered to the parapet wall is influenced by temperature change, and is easy to empty and peel off after a long time, and the coiled material is similar to a dummy. The contact place of the parapet wall and the floor is just the place with more opportunities for cracks, and the parapet wall is easy to leak.
4) The floor plate is a pressing plate and cannot play a role in water prevention.
The existing method for treating the roof leakage comprises the following steps: the heat preservation facilities and the cover plate facilities in the water leakage area are removed, then the roof cracks are treated, and the heat preservation facilities and the cover plate facilities are recovered after the treatment is finished. Many roofs have facilities and equipment installed thereon that do not in fact allow or provide conditions for removal. As pointed out in a partitioned waterproof structure of a roof structure with the publication number of CN111535511A and a construction method thereof, facilities in a leakage area are firstly dismantled, and then subsequent roof crack repair work is carried out, so that the workload is large, the construction period is long, the time and the labor are consumed, and the risk of repeated water leakage exists; also, in the method for detecting and repairing water leakage of a roof based on polyurethane waterproof glue disclosed in CN108868028A, other facilities on the roof are directly removed, then a water leakage point of the roof is found, and then the polyurethane waterproof glue is used for plugging, so as to achieve the purpose of water resistance.
In order to solve the problems, the invention provides a minimally invasive self-healing waterproof method for a roof, which aims to solve the problems of poor repairing effect, time consumption and labor consumption of the traditional waterproof roof repairing method.
Disclosure of Invention
The invention aims to provide a minimally invasive self-healing waterproof method for a roof, which aims to improve the repairing efficiency and the repairing effect.
In order to achieve the purpose, the invention provides the following scheme:
a roofing minimally invasive self-healing waterproof method comprises the following steps:
a grouting hole is formed in the floor slab and extends into the heat-insulating layer;
grouting the area to be repaired of the heat-insulating layer through the grouting hole;
continuously injecting the mortar, wherein the mortar enters between the heat-insulating layer and the waterproof layer along a leakage channel in the area to be repaired of the heat-insulating layer and enters between the roof and the waterproof layer through a waterproof layer crack;
and the mortar enters the roof cracks to finish the plugging of the roof cracks.
Preferably, when grouting is performed on the area to be repaired of the heat insulation layer, grouting is performed on the remaining area of the heat insulation layer synchronously.
Preferably, the mortar is polymer mortar containing self-repairing materials, and the polymer mortar comprises fine sand, cement and the self-repairing materials.
Preferably, the heat insulation layer is a perlite heat insulation layer.
Preferably, after the roof crack is processed, the surface of the floor slab is polished, the floor slab crack is caulked by using silica gel, and the surface of the floor slab is coated with a cement base containing a self-repairing material.
Preferably, a coloured remoulded mortar layer is laid on the cement base.
Preferably, get rid of along extending roofing to escape canal and parapet the heat preservation, adopt two ingredient silica gel to carry out the caulking to parapet crack and escape canal crack parapet and escape canal surface coating contain self-repairing material's coating.
Preferably, the parapet and drain are flushed with a high pressure water gun prior to repair of the parapet and drain cracks.
Preferably, the parapet and drain cracks are expanded to a width of 5mm to 6mm using a slotter before the parapet and drain cracks are repaired.
Preferably, the thickness of the heat-insulating layer is 8cm to 12 cm.
Compared with the prior art, the invention has the following technical effects:
1. according to the invention, the grouting holes are formed in the floor slab and the heat-insulating layer and grouting is carried out in the grouting holes, so that the repair of the leakage channel in the to-be-repaired area of the heat-insulating layer is completed, and the problems of time consumption and labor consumption caused by large-scale dismantling of the waterproof heat-insulating structure are avoided; in addition, mortar conveyed by means of the leakage channel can enter into a roof crack, so that the repair of the roof crack is completed, the repair of the leakage channel of the heat-insulating layer and the roof crack is gradually completed by means of minimally invasive, time and labor are saved, and the waterproof repair efficiency is improved.
2. In the invention, when the area to be repaired of the heat-insulating layer is grouted, the rest area of the heat-insulating layer is synchronously grouted; the whole heat-insulating layer area is subjected to full-coverage grouting during grouting, the original accumulated water in the heat-insulating layer is drained, the original loose internal structure is densified to form a new waterproof layer, the heat-insulating layer has good waterproof and waterproof effects while preserving heat, and rainwater on the floor plate is prevented from leaking downwards fundamentally.
3. After the roof crack is processed, the surface of the floor slab is polished, the floor slab crack is caulked by using silica gel, and a cement base containing a self-repairing material is coated on the surface of the floor slab; strengthen the water-proof effects of floor's board, avoid or reduce the seepage of rainwater on the floor board, and then reach the purpose of reinforcing water-proof effects.
4. In the invention, a color remolding mortar layer is laid on a cement base; the purpose of beautifying the roof is achieved.
Drawings
In order to more clearly illustrate the present invention or technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic structural diagram of a roof;
wherein, 1, a floor slab; 2. a heat-insulating layer; 3. cement-based; 4. remolding the mortar layer; 5. roof cracks; 6. parapet cracks; 7. a gutter crack; 8. coating; 9. a parapet wall; 10. two-component silica gel; 11. a waterproof layer; 12. and (4) a roof.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a minimally invasive self-healing waterproof method for a roof, which aims to improve the repairing efficiency and the repairing effect.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 1, a minimally invasive self-healing waterproof method for a roof includes the following steps: a grouting hole is formed in the floor slab 1 and extends into the heat-insulating layer 2; grouting the area to be repaired of the insulating layer 2 through the grouting hole; continuously injecting mortar, wherein the mortar enters between the insulating layer 2 and the waterproof layer 11 along a leakage channel in the area to be repaired of the insulating layer 2 and enters between the roof 12 and the waterproof layer 11 through a waterproof layer crack; the mortar enters the roof crack 5 to complete the plugging of the roof crack 5; according to the invention, the building cover plate 1 and the heat insulation layer 2 are provided with the grouting holes and grouting is carried out in the grouting holes, so that the repair of the leakage channel in the to-be-repaired area of the heat insulation layer 2 is completed, and the problems of time consumption and labor consumption caused by large-scale dismantling of the waterproof heat insulation structure are avoided; in addition, mortar conveyed by means of the leakage channel can enter the roof cracks 5, so that the roof cracks 5 can be repaired, the leakage channel of the heat-insulating layer 2 and the roof cracks 5 can be repaired gradually by means of minimally invasive, time and labor are saved, and the waterproof repairing efficiency is improved.
Further, when grouting is performed on the area to be repaired of the heat insulation layer 2, synchronously grouting is performed on the rest area of the heat insulation layer 2; in the invention, the whole area of the heat-insulating layer 2 is subjected to full-coverage grouting during grouting, so that the original accumulated water in the heat-insulating layer 2 is drained, the original loose internal structure becomes compact and becomes a new waterproof layer, the heat-insulating layer 2 has good waterproof effect while preserving heat, and the downward leakage of rainwater on the floor plate 1 is fundamentally avoided.
Further, the mortar is polymer mortar containing self-repairing materials, and the polymer mortar comprises fine sand stones, cement and the self-repairing materials; polymer mortar carries out under the prerequisite of shutoff through reasonable component distribution ratio, guaranteeing that the mortar carries out the shutoff to the space of heat preservation 2, equally can carry out downwards along the seepage passageway and enter into roofing crack 5, has avoided the mortar ratio unreasonable to cause the aggregate to pile up the problem that can't enter into roofing crack 5 in heat preservation 2, arouses the not high problem of roofing crack 5 repair quality simultaneously.
Further, the heat-insulating layer 2 is a perlite heat-insulating layer.
Further, after finishing the treatment of the roof crack 5, polishing the surface of the floor slab 1, caulking the crack of the floor slab 1 by using silica gel, and coating a cement base 3 containing a self-repairing material on the surface of the floor slab 1; strengthen floor's 1 water-proof effects, avoid or reduce the seepage of rainwater on floor 1, and then reach the purpose of reinforcing water-proof effects.
Further, a color remolding mortar layer 4 is laid on the cement base 3; achieving the purpose of beautifying the roof 12.
Further, removing the heat insulation layer 2 extending out of the roof 12 to the drainage ditch and the parapet 9, caulking the parapet cracks 6 and the drainage ditch cracks 7 by adopting double-component silica gel 10, and coating the parapet 9 and the drainage ditch with a coating 8 containing a self-repairing material; adopt bi-component silica gel to carry out caulking to parapet crack 6 and escape canal crack 7 and handled and strengthened the shutoff effect, brush the maintenance with paint 8 that has the selfreparing material to parapet 9, floor escape canal simultaneously, make concrete surface and inside compacter, waterproof prevent freeze thawing to play the effect of application.
Further, before repairing the parapet wall cracks 6 and the drainage ditch cracks 7, flushing parapet walls 9 and drainage ditches by using a high-pressure water gun; debris in parapet crack 6 and the escape canal crack 7 are cleared up out on the one hand, and on the other hand guarantees that bi-component silica gel has debris to parapet crack 6 and the shutoff effect of escape canal crack 7, avoids parapet crack 6 and escape canal crack 7 to have, influences bi-component silica gel's result of use.
Further, before repairing the parapet cracks 6 and the drainage ditch cracks 7, the widths of the parapet cracks 6 and the drainage ditch cracks 7 are expanded to 5 mm-6 mm by using a grooving machine; the dual-component silica gel is conveniently implanted, the whole parapet cracks 6 and the whole drainage ditch cracks 7 are completely plugged, and the problems that the parapet cracks 6 and the drainage ditch cracks are too small and narrow and the plugging of the dual-component silica gel is not in place are avoided.
Further, the thickness of the heat-insulating layer 2 is 8cm to 12 cm.
The specific construction process of the invention is as follows:
a grouting hole is arranged on the floor slab 1 and drilled till the perlite heat-insulating layer 2; grouting polymer mortar containing self-repairing materials, filling the whole heat-insulating layer 2, draining away the original accumulated water in the heat-insulating layer 2, and compacting the original loose internal structure to form a waterproof layer; polymer mortar is continuously injected, the polymer mortar flows onto the cracks of the waterproof layer 11 along the original leakage channel of the insulating layer 2 under the action of grouting pressure and enters the roof cracks 5 through the cracks of the waterproof layer 11, the polymer mortar directly enters the cracks for the large roof cracks 5 to block the cracks, self-repairing materials enter the small roof cracks 5 to excite silicates which are not subjected to hydration reaction in concrete around the cracks, and the leaked water is utilized to perform hydration reaction to generate crystalline materials to block the cracks, so that the waterproof effect is achieved; and finally finishing the repair work of the roof crack 5.
The adaptation according to the actual needs is within the scope of the invention.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (10)
1. A minimally invasive self-healing waterproof method for a roof is characterized by comprising the following steps:
a grouting hole is formed in the floor slab and extends into the heat-insulating layer;
grouting the area to be repaired of the heat-insulating layer through the grouting hole;
continuously injecting the mortar, wherein the mortar enters between the heat-insulating layer and the waterproof layer along a leakage channel in the area to be repaired of the heat-insulating layer and enters between the roof and the waterproof layer through a waterproof layer crack;
and the mortar enters the roof cracks to finish the plugging of the roof cracks.
2. The minimally invasive self-healing and waterproof method for roofing according to claim 1, wherein during grouting of the area to be repaired of the insulation layer, the remaining area of the insulation layer is synchronously grouted.
3. The minimally invasive self-healing waterproof method for roofing according to claim 1, characterized in that the mortar is a polymer mortar containing self-healing materials, and the polymer mortar comprises fine sand, cement and self-healing materials.
4. The minimally invasive self-healing waterproof method for roofing according to claim 1, wherein the insulation layer is a perlite insulation layer.
5. The minimally invasive self-healing and waterproof method for the roof according to claim 1, wherein after the treatment of the roof cracks is completed, the surface of the floor slab is polished, the cracks of the floor slab are caulked by using silica gel, and a cement base containing a self-repairing material is coated on the surface of the floor slab.
6. The minimally invasive self-healing waterproof method for roofing according to claim 5, characterized in that a colored remolded mortar layer is laid on the cement base.
7. The minimally invasive self-healing and waterproof method for roofs according to claim 1, characterized in that the heat-insulating layer extending from the roof to the drainage ditch and the parapet wall is removed, caulking treatment is performed on the parapet wall cracks and the drainage ditch cracks by adopting double-component silica gel, and the parapet wall and the drainage ditch are coated with a coating containing a self-healing material.
8. The minimally invasive self-healing and waterproof method for roofing according to claim 7, wherein the parapet and the drainage ditch are flushed with a high pressure water gun before the parapet and the drainage ditch are repaired.
9. The minimally invasive self-healing and waterproofing roofing method according to claim 7, wherein before the parapet and drainage ditch cracks are repaired, the parapet and drainage ditch cracks are expanded to a width of 5mm to 6mm by using a grooving machine.
10. The minimally invasive self-healing waterproof method for roofing according to claim 1, wherein the thickness of the insulating layer is 8cm to 12 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210030154.XA CN114197915B (en) | 2022-01-12 | 2022-01-12 | Minimally invasive self-healing waterproof method for roof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210030154.XA CN114197915B (en) | 2022-01-12 | 2022-01-12 | Minimally invasive self-healing waterproof method for roof |
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| CN114197915A true CN114197915A (en) | 2022-03-18 |
| CN114197915B CN114197915B (en) | 2023-05-05 |
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