CN102758486B - Anti-seepage method for building engineering - Google Patents
Anti-seepage method for building engineering Download PDFInfo
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- CN102758486B CN102758486B CN201210240246.7A CN201210240246A CN102758486B CN 102758486 B CN102758486 B CN 102758486B CN 201210240246 A CN201210240246 A CN 201210240246A CN 102758486 B CN102758486 B CN 102758486B
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000010276 construction Methods 0.000 claims abstract description 60
- 239000004567 concrete Substances 0.000 claims abstract description 55
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 30
- 239000010410 layer Substances 0.000 claims description 24
- 239000011449 brick Substances 0.000 claims description 21
- 239000004570 mortar (masonry) Substances 0.000 claims description 15
- 238000004078 waterproofing Methods 0.000 claims description 15
- 238000011065 in-situ storage Methods 0.000 claims description 9
- 239000011083 cement mortar Substances 0.000 claims description 6
- 238000009413 insulation Methods 0.000 claims description 6
- 238000012423 maintenance Methods 0.000 claims description 6
- 239000011505 plaster Substances 0.000 claims description 6
- 230000003014 reinforcing effect Effects 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 238000004378 air conditioning Methods 0.000 claims description 3
- 230000004888 barrier function Effects 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 3
- 239000004568 cement Substances 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 239000011247 coating layer Substances 0.000 claims description 3
- 238000005336 cracking Methods 0.000 claims description 3
- 238000005034 decoration Methods 0.000 claims description 3
- 239000000428 dust Substances 0.000 claims description 3
- 238000005538 encapsulation Methods 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 3
- 238000009408 flooring Methods 0.000 claims description 3
- 239000012634 fragment Substances 0.000 claims description 3
- 230000008595 infiltration Effects 0.000 claims description 3
- 238000001764 infiltration Methods 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 238000012856 packing Methods 0.000 claims description 3
- 239000003973 paint Substances 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000004080 punching Methods 0.000 claims description 3
- 230000005855 radiation Effects 0.000 claims description 3
- 239000011150 reinforced concrete Substances 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 239000002344 surface layer Substances 0.000 claims description 3
- 238000009736 wetting Methods 0.000 claims description 3
- 238000013523 data management Methods 0.000 abstract 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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Abstract
The invention discloses an anti-leakage method for building engineering, which comprises the steps of roof concrete floor anti-leakage construction, parapet and roof stairwell bottom anti-leakage construction, outer wall anti-leakage construction, kitchen and toilet anti-leakage construction, basement anti-leakage construction and engineering data management. The invention has convenient construction and good effect and ensures the anti-seepage quality.
Description
Technical field
The present invention relates to a kind of Antiseep method of construction work.
Background technology
The antiseep of architectural process is a very important engineering, and existing method ubiquity defective is difficult to ensure the quality of products or construct complexity.
Summary of the invention
The object of the present invention is to provide a kind of easy construction, the Antiseep method of the construction work that construction quality is good.
Technical solution of the present invention is:
A kind of Antiseep method of construction work, comprise roofing concrete floor anti-seepage construction, parapet and go out roofing staircase bottom anti-seepage construction, outer wall impermeable leakage construction, lavatory, kitchen anti-seepage construction, Basement Anti-seepage Construction, Engineering documents Management, it is characterized in that:
(1) roofing concrete floor anti-seepage construction
Roofing concrete intensity is not less than C30, and the expansion agent of mixing the 5-30% percentage by weight makes expansive concrete, and concrete is played from waterproof action; Use the double-layer double-direction steel mesh reinforcement, increase radiation anticracking reinforcing bar at the plate angle that easily produces the crack; Roof drainage 〉=2%, leveling layer in length and breadth every 6m are established dividing joint, stitch wide 20mm;
(2) parapet and go out roofing staircase bottom anti-seepage construction
For the double-layer double-direction reinforcing bar that the cast-in-situ concrete parapet is joined φ 8@150, thickness of slab 〉=100mm; When brick up parapet or staircase body of wall, except corner arranges the cast-in-situ concrete constructional column, set up the cast-in-situ concrete constructional column in the body of wall middle part, spacing≤3m, the building wall mortar strength is not less than M7.5; Flashing place waterproof height is stretched over below the bearing down on one of parapet;
(3) outer wall impermeable leaks construction
It mainly is at construction link that outer wall impermeable leaks, and for pertusate place, wants the wetting brick body on every side of first trickle when shutoff, then closely knit with the pea gravel concreten pouring, meets loosening fragment of brick and should heavily build; The frame wall filled with masonry dome brick is left to more than the 7d builds by laying bricks or stones again, and Shang Xia Wedged is tight when building by laying bricks or stones, and the slit between brick wall and the frame column is filled up with mortar;
When the exterior wall decoration construction, motar uses the cement mortar that is not less than 1:3, and the thickness of plastering is not less than 20mm, and the position of thickness low LCL or outstanding metope is chipping in advance; At the position that is prone to the crack, set up gauze wire cloth in the floated coat, floated coat is done waterproofing work; Adopt special pointing packing real around the window frame, encapsulation process is done at the girth seam place of aluminum alloy outer frame;
When outer walling uses concrete hollow block, reinforced concrete pillar is set, body of wall and concrete structure binding site arrange the anti-cracking structure measure; Windowsill arranges pea gravel concreten and bears down on one; What exterior wall had air-conditioning or other facilities arranges support shelf and hole, avoids or reduces the user in the punching of exterior wall cutter eye;
(4) lavatory, kitchen anti-seepage construction
Casting and compacting of concrete is closely knit; Lavatory, kitchen peripheral flanging concrete exceeds at least 120mm of flooring, and builds simultaneously with floor concrete, does not take secondary to build way; After form removable around the hole, lavatory, smear the 1:2 waterproofing mortar and do leveling layer, and plastering and removed first dust, greasy dirt and swabbing gray scale in the basic unit before levelling is that the plain-water slurry of 1:2 is closely knit to guarantee to be combined with basic unit, mortar laminated compacting, and surface layer is smooth, thickness is not less than 20mm, the height of plastering is smeared to floor face around the wall of hole, and fillet is made at the negative and positive angle, and the hole wall should be finished simultaneously with the end, hole and not stay constuction joint, answer the water filling maintenance after plastering construction is complete, the time is no less than 7 round the clock;
Concrete cushion after the heavy hole backfill in lavatory adopts pea gravel concreten to water puddling in fact, and thickness is not less than 40mm; Concrete cushion must not have the slit with the joint that reaches closet all around, thereby forms waterproof barrier one, prevents that effectively the water on surface from infiltrating the end, hole, requires equally every layer to accomplish that joint is tight when next doing leveling layer and finish coat, does not form the slit.So just form complete from level to level waterproof system from top to bottom;
The floor in lavatory, kitchen and flange adopt self-waterproof concrete, to reduce the formation in concrete self crack; Plaster and adopt waterproofing mortar with levelling; The floor in lavatory, kitchen is done 2mm thick waterproof coating layer and topping, and waterproofing course exceeds at least 300mm of floor face, and kitchen surface is lower than outside ground 40mm～50mm;
(5) Basement Anti-seepage Construction
Before the concreting, spread first the thick and concrete cement mortar in proportion of 50mm～100mm, striking time is 14d, to avoid structure crack or to be vibrated in advance; Basic unit's swabbing gray scale is 0.5 cement slurry, and smooth basic unit also does in advance texturing and processes, and floated coat is combined firmly with basic unit.
(6) Engineering documents Management
Roofing is done for the first time pouring water test after finishing leveling layer, test figure should be write drainage grade, water-sprinkling time exactly; At the bottom of the inspection plate, pipeline infiltration and ponding situation, after the heat insulation construction of roof heat insulation is complete, do for the second time pouring water test or do the retaining test, the retaining test should be drawn plan view, dated pipeline location and draining, water outlet direction on the figure;
The lavatory, kitchen finish plaster with leveling layer, waterproofing course after respectively do retaining test, require exhaustive test; The most shallow 25mm that is not less than of the retaining degree of depth, and be no more than the sleeve pipe height; What the pipeline plug receptacle was low will stop up, and storage time is not less than 24h; Also do water injection test after surface construction is complete one time, also increase has or not seeping phenomenon after indicating draining specifically;
Exterior wall is done water pouring test one time when plastering maintenance, do the secondary water pouring test after facing is complete, and paints elevation.
Easy construction of the present invention, effective, guarantee the antiseep quality.
The invention will be further described below in conjunction with embodiment.
The specific embodiment
A kind of Antiseep method of construction work comprises roofing concrete floor anti-seepage construction, parapet and goes out roofing staircase bottom anti-seepage construction, outer wall impermeable leakage construction, lavatory, kitchen anti-seepage construction, Basement Anti-seepage Construction, Engineering documents Management,
(1) roofing concrete floor anti-seepage construction
Roofing concrete intensity is not less than C30, and the expansion agent of mixing the 5-30% percentage by weight makes expansive concrete, and concrete is played from waterproof action; Use the double-layer double-direction steel mesh reinforcement, increase radiation anticracking reinforcing bar at the plate angle that easily produces the crack; Roof drainage 〉=2%, leveling layer in length and breadth every 6m are established dividing joint, stitch wide 20mm;
(2) parapet and go out roofing staircase bottom anti-seepage construction
For the double-layer double-direction reinforcing bar that the cast-in-situ concrete parapet is joined φ 8@150, thickness of slab 〉=100mm; When brick up parapet or staircase body of wall, except corner arranges the cast-in-situ concrete constructional column, set up the cast-in-situ concrete constructional column in the body of wall middle part, spacing≤3m, the building wall mortar strength is not less than M7.5; Flashing place waterproof height is stretched over below the bearing down on one of parapet;
(3) outer wall impermeable leaks construction
It mainly is at construction link that outer wall impermeable leaks, and for pertusate place, wants the wetting brick body on every side of first trickle when shutoff, then closely knit with the pea gravel concreten pouring, meets loosening fragment of brick and should heavily build; The frame wall filled with masonry dome brick is left to more than the 7d builds by laying bricks or stones again, and Shang Xia Wedged is tight when building by laying bricks or stones, and the slit between brick wall and the frame column is filled up with mortar;
When the exterior wall decoration construction, motar uses the cement mortar that is not less than 1:3, and the thickness of plastering is not less than 20mm, and the position of thickness low LCL or outstanding metope is chipping in advance; At the position that is prone to the crack, set up gauze wire cloth in the floated coat, floated coat is done waterproofing work; Adopt special pointing packing real around the window frame, encapsulation process is done at the girth seam place of aluminum alloy outer frame;
When outer walling uses concrete hollow block, reinforced concrete pillar is set, body of wall and concrete structure binding site arrange the anti-cracking structure measure; Windowsill arranges pea gravel concreten and bears down on one; What exterior wall had air-conditioning or other facilities arranges support shelf and hole, avoids or reduces the user in the punching of exterior wall cutter eye;
(4) lavatory, kitchen anti-seepage construction
Casting and compacting of concrete is closely knit; Lavatory, kitchen peripheral flanging concrete exceeds at least 120mm of flooring, and builds simultaneously with floor concrete, does not take secondary to build way; After form removable around the hole, lavatory, smear the 1:2 waterproofing mortar and do leveling layer, and plastering and removed first dust, greasy dirt and swabbing gray scale in the basic unit before levelling is that the plain-water slurry of 1:2 is closely knit to guarantee to be combined with basic unit, mortar laminated compacting, and surface layer is smooth, thickness is not less than 20mm, the height of plastering is smeared to floor face around the wall of hole, and fillet is made at the negative and positive angle, and the hole wall should be finished simultaneously with the end, hole and not stay constuction joint, answer the water filling maintenance after plastering construction is complete, the time is no less than 7 round the clock;
Concrete cushion after the heavy hole backfill in lavatory adopts pea gravel concreten to water puddling in fact, and thickness is not less than 40mm; Concrete cushion must not have the slit with the joint that reaches closet all around, thereby forms waterproof barrier one, prevents that effectively the water on surface from infiltrating the end, hole, requires equally every layer to accomplish that joint is tight when next doing leveling layer and finish coat, does not form the slit.So just form complete from level to level waterproof system from top to bottom;
The floor in lavatory, kitchen and flange adopt self-waterproof concrete, to reduce the formation in concrete self crack; Plaster and adopt waterproofing mortar with levelling; The floor in lavatory, kitchen is done 2mm thick waterproof coating layer and topping, and waterproofing course exceeds at least 300mm of floor face, and kitchen surface is lower than outside ground 40mm～50mm;
(5) Basement Anti-seepage Construction
Before the concreting, spread first the thick and concrete cement mortar in proportion of 50mm～100mm, striking time is 14d, to avoid structure crack or to be vibrated in advance; Basic unit's swabbing gray scale is 0.5 cement slurry, and smooth basic unit also does in advance texturing and processes, and floated coat is combined firmly with basic unit.
(6) Engineering documents Management
Roofing is done for the first time pouring water test after finishing leveling layer, test figure should be write drainage grade, water-sprinkling time exactly; At the bottom of the inspection plate, pipeline infiltration and ponding situation, after the heat insulation construction of roof heat insulation is complete, do for the second time pouring water test or do the retaining test, the retaining test should be drawn plan view, dated pipeline location and draining, water outlet direction on the figure;
The lavatory, kitchen finish plaster with leveling layer, waterproofing course after respectively do retaining test, require exhaustive test; The most shallow 25mm that is not less than of the retaining degree of depth, and be no more than the sleeve pipe height; What the pipeline plug receptacle was low will stop up, and storage time is not less than 24h; Also do water injection test after surface construction is complete one time, also increase has or not seeping phenomenon after indicating draining specifically;
Exterior wall is done water pouring test one time when plastering maintenance, do the secondary water pouring test after facing is complete, and paints elevation.
Claims (1)
1. the Antiseep method of a construction work, comprise roofing concrete floor anti-seepage construction, parapet and go out roofing staircase bottom anti-seepage construction, outer wall impermeable leakage construction, lavatory, kitchen anti-seepage construction, Basement Anti-seepage Construction, Engineering documents Management, it is characterized in that:
(1) roofing concrete floor anti-seepage construction
Roofing concrete intensity is not less than C30, and the expansion agent of mixing the 5-30% percentage by weight makes expansive concrete, and concrete is played from waterproof action; Use the double-layer double-direction steel mesh reinforcement, increase radiation anticracking reinforcing bar at the plate angle that easily produces the crack; Roof drainage 〉=2%, leveling layer in length and breadth every 6m are established dividing joint, stitch wide 20mm;
(2) parapet and go out roofing staircase bottom anti-seepage construction
For the double-layer double-direction reinforcing bar that the cast-in-situ concrete parapet is joined φ 8@150, thickness of slab 〉=100mm; When brick up parapet or staircase body of wall, except corner arranges the cast-in-situ concrete constructional column, set up the cast-in-situ concrete constructional column in the body of wall middle part, spacing≤3m, the building wall mortar strength is not less than M7.5; Flashing place waterproof height is stretched over below the bearing down on one of parapet;
(3) outer wall impermeable leaks construction
It mainly is at construction link that outer wall impermeable leaks, and for pertusate place, wants the wetting brick body on every side of first trickle when shutoff, then closely knit with the pea gravel concreten pouring, meets loosening fragment of brick and should heavily build; The frame wall filled with masonry dome brick is left to more than the 7d builds by laying bricks or stones again, and embedding is tight up and down when building by laying bricks or stones, and the slit between brick wall and the frame column is filled up with mortar;
When the exterior wall decoration construction, motar uses the cement mortar that is not less than 1:3, and the thickness of plastering is not less than 20mm, and the position of outstanding metope is chipping in advance; At the position that is prone to the crack, set up gauze wire cloth in the floated coat, floated coat is done waterproofing work; Adopt the pointing packing real around the window frame, encapsulation process is done at the girth seam place of aluminum alloy outer frame;
When outer walling uses concrete hollow block, reinforced concrete pillar is set, body of wall and concrete structure binding site arrange the anti-cracking structure measure; Windowsill arranges pea gravel concreten and bears down on one; What exterior wall had air-conditioning or other facilities arranges support shelf and hole, avoids or reduces the user in the punching of exterior wall cutter eye;
(4) lavatory, kitchen anti-seepage construction
Casting and compacting of concrete is closely knit; Lavatory, kitchen peripheral flanging concrete exceeds at least 120mm of flooring, and builds simultaneously with floor concrete, does not take secondary to build way; After form removable around the hole, lavatory, smear the 1:2 waterproofing mortar and do leveling layer, and plastering and removed first dust, greasy dirt and swabbing gray scale in the basic unit before levelling is that the plain-water slurry of 1:2 is closely knit to guarantee to be combined with basic unit, mortar laminated compacting, and surface layer is smooth, thickness is not less than 20mm, the height of plastering is smeared to floor face around the wall of hole, and fillet is made at the negative and positive angle, and the hole wall should be finished simultaneously with the end, hole and not stay constuction joint, answer the water filling maintenance after plastering construction is complete, the time is no less than 7 round the clock;
Concrete cushion after the heavy hole backfill in lavatory adopts pea gravel concreten to water puddling in fact, and thickness is not less than 40mm; Concrete cushion must not have the slit with the joint that reaches closet all around, thereby form waterproof barrier one, the water that effectively prevents the surface infiltrates the end, hole, require equally every layer to accomplish that joint is tight when next doing leveling layer and finish coat, do not form the slit, so just form complete from level to level waterproof system from top to bottom;
The floor in lavatory, kitchen and flange adopt self-waterproof concrete, to reduce the formation in concrete self crack; Plaster and adopt waterproofing mortar with levelling; The floor in lavatory, kitchen is done 2mm thick waterproof coating layer and topping, and waterproofing course exceeds at least 300mm of floor face, and kitchen surface is lower than outside ground 40mm～50mm;
(5) Basement Anti-seepage Construction
Before the concreting, spread first the thick and concrete cement mortar in proportion of 50mm～100mm, striking time is 14d, to avoid structure crack or to be vibrated in advance; Basic unit's swabbing gray scale is 0.5 cement slurry, and smooth basic unit also does in advance texturing and processes, and floated coat is combined with basic unit firmly;
(6) Engineering documents Management
Roofing is done for the first time pouring water test after finishing leveling layer, test figure should be write drainage grade, water-sprinkling time exactly; At the bottom of the inspection plate, pipeline infiltration and ponding situation, after the heat insulation construction of roof heat insulation is complete, do for the second time pouring water test or do the retaining test, the retaining test should be drawn plan view, dated pipeline location and draining, water outlet direction on the figure;
The lavatory, kitchen finish plaster with leveling layer, waterproofing course after respectively do retaining test, require exhaustive test; The most shallow 25mm that is not less than of the retaining degree of depth, and be no more than the sleeve pipe height; What the pipeline plug receptacle was low will stop up, and storage time is not less than 24h; Also do water injection test after surface construction is complete one time, also increase has or not seeping phenomenon after indicating draining specifically;
Exterior wall is done water pouring test one time when plastering maintenance, do the secondary water pouring test after facing is complete, and paints elevation.
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| CN201210240246.7A CN102758486B (en) | 2012-07-12 | 2012-07-12 | Anti-seepage method for building engineering |
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| CN102758486B true CN102758486B (en) | 2013-05-29 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102936954A (en) * | 2012-11-28 | 2013-02-20 | 深圳市鹏城建筑集团有限公司 | Method and structure for plugging pipeline floor hole |
| CN104179263A (en) * | 2014-09-01 | 2014-12-03 | 中启胶建集团有限公司 | Building exterior wall external thermal insulation system waterproof and drainage construction method |
| CN106677355A (en) * | 2017-02-27 | 2017-05-17 | 中国冶集团有限公司 | Floor slab hole plugging device and method |
| CN108755983B (en) * | 2018-06-01 | 2020-09-08 | 湖南吉米防水科技有限公司 | Waterproof process |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3969861A (en) * | 1974-06-17 | 1976-07-20 | Hanlon Edward J O | Leakproof roof and method of constructing same |
| CN87102845A (en) * | 1987-04-22 | 1988-11-02 | 马铭锋 | Concrete work leak-prevention treatment and repair material and technologies such as roofing |
| CN1109130A (en) * | 1994-03-25 | 1995-09-27 | 郭玉民 | Method for preventing water leakage of roof or floor |
| CN2876207Y (en) * | 2006-03-15 | 2007-03-07 | 刘丹 | Water leakage proof structure of floor surface or roof surface deformed seam |
| CN201474099U (en) * | 2009-08-11 | 2010-05-19 | 北京城建集团有限责任公司 | Three-layer waterproof structure for deformation joint |
| CN202124949U (en) * | 2011-06-28 | 2012-01-25 | 天津天一建设集团有限公司 | Equal height type waterproof expansion joint of roof parapet wall |
-
2012
- 2012-07-12 CN CN201210240246.7A patent/CN102758486B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3969861A (en) * | 1974-06-17 | 1976-07-20 | Hanlon Edward J O | Leakproof roof and method of constructing same |
| CN87102845A (en) * | 1987-04-22 | 1988-11-02 | 马铭锋 | Concrete work leak-prevention treatment and repair material and technologies such as roofing |
| CN1109130A (en) * | 1994-03-25 | 1995-09-27 | 郭玉民 | Method for preventing water leakage of roof or floor |
| CN2876207Y (en) * | 2006-03-15 | 2007-03-07 | 刘丹 | Water leakage proof structure of floor surface or roof surface deformed seam |
| CN201474099U (en) * | 2009-08-11 | 2010-05-19 | 北京城建集团有限责任公司 | Three-layer waterproof structure for deformation joint |
| CN202124949U (en) * | 2011-06-28 | 2012-01-25 | 天津天一建设集团有限公司 | Equal height type waterproof expansion joint of roof parapet wall |
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Address after: 215300 No. 1158 Xiao Li Road, Kunshan, Jiangsu, Suzhou Patentee after: Zhenhua Group (Kunshan) construction Limited by Share Ltd Address before: 215300 No. 1158 Xiao Li Road, Kunshan, Jiangsu, Suzhou Patentee before: ZHENHUA GROUP (KUNSHAN) CONSTRUCTION ENGINEERING CO., LTD. |
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Effective date of registration: 20211217 Address after: 273500, 500m southwest of Liuzhuang village, Chengqian Town, Zoucheng City, Jining City, Shandong Province Patentee after: Shandong Mencius ecological agriculture Limited by Share Ltd. Address before: 294 zhongzi street, Sishui County, Jining City, Shandong Province Patentee before: Zhang Fei |
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Effective date of registration: 20220506 Address after: 273500 No. 517, merchants Road, Gangshan street, Zoucheng City, Jining City, Shandong Province (North Gate of Xinqi farmers' market) Patentee after: Shandong Xinqi Cultural Tourism Co.,Ltd. Address before: 273500, 500m southwest of Liuzhuang village, Chengqian Town, Zoucheng City, Jining City, Shandong Province Patentee before: Shandong Mencius ecological agriculture Limited by Share Ltd. |
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Denomination of invention: Anti leakage method of building engineering Effective date of registration: 20220518 Granted publication date: 20130529 Pledgee: Zou Cheng Branch of industrial and Commercial Bank of China Ltd. Pledgor: Shandong Xinqi Cultural Tourism Co.,Ltd. Registration number: Y2022980005702 |
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