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GB 55030-2022 English PDF

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GB 55030-2022: General code for waterproofing of building and municipal engineering
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Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
GB 55030-2022	English	889	Add to Cart	8 days [Need to translate]	General code for waterproofing of building and municipal engineering	Valid	GB 55030-2022

Standard similar to GB 55030-2022

GB 55033 GB 55031

Basic data

Standard ID	GB 55030-2022 (GB55030-2022)
Description (Translated English)	General code for waterproofing of building and municipal engineering
Sector / Industry	National Standard
Word Count Estimation	44,417
Date of Issue	2022-09-27
Date of Implementation	2023-04-01
Issuing agency(ies)	Ministry of Housing and Urban-Rural Development of the People's Republic of China; State Administration for Market Regulation

GB 55030-2022: General code for waterproofing of building and municipal engineering

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
1 General 1.0.1 In order to standardize the waterproof performance of buildings and municipal engineering, ensure personal health, life and property safety, ecological environment safety, and waterproof engineering quality, and meet the needs of economic and social management, this specification is formulated in accordance with relevant laws and regulations. 1.0.2 Waterproofing of buildings and municipal works must comply with this specification. 1.0.3 Whether the technical methods and measures adopted in the project construction meet the requirements of this specification shall be judged by the relevant responsible parties. Among them, innovative technical methods and measures should be demonstrated and meet the performance requirements in this specification. 2 Basic regulations 2.0.1 The waterproofing of the project should follow the principles of adapting measures to local conditions, focusing on prevention, combining prevention and drainage, and comprehensive management. 2.0.2 The working life of the waterproof design of the project shall meet the following requirements. 1 The working life of underground engineering waterproof design should not be lower than the working life of engineering structure design; 2 The waterproof design working period of the roof project should not be less than 20 years; 3.The working life of indoor engineering waterproof design should not be less than 25 years;

4 The working life of bridge deck waterproof design should not be lower than the design working life of bridge deck pavement

5 The design working life of the waterproof layer on the inner wall of non-erosive medium water storage projects shall not be less than 10 years. 2.0.3 Projects are classified into Category A, Category B and Category C according to the importance of waterproof function, and the specific classification shall comply with the provisions in Table 2.0.3. 2.0.4 The category classification of engineering waterproof use environment shall comply with the provisions in Table 2.0.4. 2.0.5 For the open-cut underground project whose waterproof use environment category is Class II, when the annual precipitation in the project site is greater than 400mm, it should be selected according to Class I waterproof use environment. 2.0.6 The waterproof grade of the project shall be divided into first grade, second grade and third grade according to the engineering category and the engineering waterproof use environment category. The waterproof level of underground engineering by underground excavation method shall be determined according to factors such as project category, engineering geological conditions and construction conditions, and the waterproof level of other projects shall not be lower than the following regulations 1 Class I waterproof. Category A project under Category I and Category II waterproof environment; Category B project under Category I waterproof environment. 2 Secondary waterproofing. Category A project under Category III waterproof environment; Category B project under Category II waterproof environment; Category C project under Category I waterproof environment. 3 Three-level waterproof. Class B project under Class III waterproof environment; Class C project under Class II and III waterproof environment. 2.0.7 The waterproof material used in the project should meet the durability requirements, and the waterproof layer of the membrane should meet the requirements of seam peel strength and lap seam impermeability.

3 Material Engineering Requirements

3.1 General provisions 3.1.1 The durability of the waterproof material should be compatible with the working life of the engineering waterproof design. 3.1.2 The selection of waterproof materials should meet the following requirements. 1 The performance of the material should be compatible with the environmental conditions of the project; 2 The thickness of each waterproof layer shall meet the minimum thickness requirements of waterproof fortification; 3 The limit of substances and harmful substances of waterproof materials that affect the environment shall meet the requirements. 3.1.3 The flammability level of the exposed waterproof material should not be lower than B2 level. 3.2 Waterproof concrete 3.2.1 The construction mix ratio of waterproof concrete should be determined through tests, and its strength grade should not be lower than C25, and the impermeability grade of trial concrete should be 0.2MPa higher than the design requirements. 3.2.2 Technical measures to reduce cracking shall be adopted for waterproof concrete. 3.2.3 In addition to meeting the requirements of compression resistance, impermeability and crack resistance, waterproof concrete should also meet the durability requirements of the environment and working conditions of the project. 3.3 Waterproof membrane and waterproof coating 3.3.1 Water resistance test of waterproof materials The test should be carried out under the condition of not lower than 23℃×14d, and there should be no cracks, delamination, blistering and broken phenomena after the test. When used in underground projects, the water immersion test conditions should not be lower than 23°C×7d, and the water absorption rate of the waterproof membrane should not exceed 4%; the retention rate of the bonding strength between the waterproof coating and the base layer after immersion should not be less than 80%, and the non-cured The rubber asphalt waterproof coating should be cohesive failure. 3.3.2 The thermal aging test of asphalt materials shall be carried out under the condition of not lower than 70°C×14d, and the thermal aging test of polymer materials shall be carried out under the condition of not lower than 80°C×14d. Low temperature flexibility or low temperature bendability temperature rise It should not exceed the standard value before heat aging by 2°C. 3.3.3 The artificial climate accelerated aging test for exposed waterproof materials should be carried out with xenon arc lamps, and the cumulative irradiated energy at 340mm wavelength should not be less than 5040kJ/(m2·nm). The energy should not be less than 10080kJ/(m²·nm), and the material should not appear cracking, delamination, foaming, bonding and holes after the test. 3.3.4 The seam peel strength of the waterproof membrane shall meet the requirements in Table 3.3.4, the heat aging test condition shall not be lower than 70℃×7d, and the water immersion test condition shall not be lower than 23℃×7d. 3.3.5 The impermeability of lap joints of waterproof membranes shall meet the requirements in Table 3.3.5, the conditions of heat aging test shall not be lower than 70℃×7d, and the conditions of water immersion test shall not be lower than 23℃×7d. 3.3.6 The bond strength between the waterproof material used for concrete bridge deck waterproofing and the concrete base at 23°C should not be less than 0.25MPa. 3.3.7 The material performance of the waterproof bonding layer of the steel bridge deck should be able to guarantee the normal use and durability requirements under fatigue loads such as traffic loads and temperature effects. 3.3.8 The root puncture resistant waterproof material shall pass the root puncture resistance test. 3.3.9 The waterproof membrane or waterproof coating that has been in a corrosive environment for a long time shall pass the durability test of corrosive media. 3.3.10 The minimum thickness of the membrane waterproof layer shall comply with the provisions in Table 3.3.10. 3.3.11 The minimum thickness of the waterproof layer of reactive polymer waterproof coatings, polymer emulsion waterproof coatings and water-based polymer asphalt waterproof coatings shall not be less than 1.5mm, and the minimum thickness of the waterproof layer of rubber asphalt waterproof coatings in hot-melt construction shall not be less than 1.5 mm. Should be less than 2.0mm. 3.3.12 When hot-melt construction rubber asphalt waterproof coating is used together with waterproof membrane as a waterproof layer, its thickness should not be less than 1.5mm. 3.4 Cement-based waterproof materials 3.4.1 The performance of exterior-coated cement-based osmotic crystalline waterproof materials shall comply with the current national standard "Cement-based osmotic crystalline waterproof materials" GB 18445.The thickness of the waterproof layer shall not be less than 1.0mm, and the dosage shall not be less than 1.5kg/ m2. 3.4.2 The performance indexes of polymer cement waterproof mortar and polymer cement waterproof slurry shall meet the requirements in Table 3.4.2. 3.4.3 When used in underground engineering, the thickness of the polymer cement waterproof mortar waterproof layer should not be less than 6.0mm, and the thickness of the mortar waterproof layer mixed with admixtures and waterproofing agents should not be less than 18.0mm. 3.5 Sealing material 3.5.1 The mass loss rate of building sealants for non-structural bonding should not exceed 8% for silicone, 5% for modified silicone, 7% for polyurethane, and 5% for polysulfide. 3.5.2 The properties of rubber waterstops, rubber gaskets and water-swellable rubber products should meet the current national standards "Polymer Waterproof Materials Part 2.Waterstops" GB/T 18173.2, "Polymer Waterproof Materials Part 3. Water-swellable rubber" GB/T 18173.3 and "Polymer Waterproof Materials Part 4.Rubber Gaskets for Shield Tunnel Segments" GB/T 18173.4. 3.6 Other materials 3.6.1 The dry weight per unit area of the natural sodium bentonite waterproof blanket should not be less than 5.0kg/m², and the durability index of the natural sodium bentonite waterproof blanket should meet the requirements in Table 3.6.1. 3.6.2 The thickness of the roof profiled metal plate shall be determined by the structural design and shall meet the following requirements 1 The nominal thickness of the profiled aluminum alloy surface plate should not be less than 0.9mm; 2 The nominal thickness of the profiled steel surface layer shall not be less than 0.6mm; 3 The nominal thickness of the profiled stainless steel surface plate shall not be less than 0.5mm.

4 designs

4.1 General provisions 4.1.1 Project waterproofing should carry out special waterproofing design. 4.1.2 The following structural layers should not be used as a waterproof layer. 1 Concrete roof slab; 2 plastic drainage boards; 3 Decorative tiles and non-lapped tiles without waterproof function; 4 Grouting reinforcement. 4.1.3 The waterproof grade of the planted roof and the planted roof of underground buildings (structures) shall be Class I, and at least one waterproof layer with root puncture resistance shall be set, and a protective layer shall be set on it. 4.1.4 There should be no harmful physical and chemical effects between adjacent materials and their construction techniques. 4.1.5 The main structure on the water-facing surface of underground works shall adopt waterproof concrete, and shall meet the following requirements. 1 Waterproof concrete shall meet the requirements of impermeability level; 2 The thickness of the waterproof concrete structure should not be less than 250mm; 3 The crack width of waterproof concrete should not be greater than the allowable limit of the structure, and should not penetrate 4 The impermeability grade of waterproof concrete for frost-resistant fortified sections in cold regions shall not be lower than P10. 4.1.6 Underground engineering subject to medium and above corrosive media shall meet the following requirements 1 The strength grade of waterproof concrete should not be lower than C35; 2 The design impermeability grade of waterproof concrete should not be lower than P8; 3 The main structure on the water-facing surface shall adopt corrosion-resistant waterproof concrete, and the external waterproof layer shall meet the corrosion-resistant requirements. 4.1.7 Drainage facilities should have functions such as collection, flow path and discharge. The sump and drainage ditches of underground works shall be waterproofed, and the longitudinal slope of the drainage ditches shall not be less than 0.2%. 4.1.8 The structural design of waterproof joints shall meet the following requirements. 1 When waterproof paint is used for the additional waterproof layer, carcass reinforcing materials shall be provided;

2 The rubber waterstop set for structural deformation joints shall meet the maximum deformation allowed by the structure

3 When the waterproof casing is installed on the wall-piercing pipe, the space between the waterproof casing and the wall-piercing pipe shall be sealed. 4.2 Underground engineering by open cut method 4.2.1 Waterproofing methods for cast-in-place concrete structures in open-cut underground works shall meet the following requirements 1 The waterproofing method of the main structure shall comply with the provisions in Table 4.2.1. 2 For engineering parts such as the side walls of the superimposed structure, the external waterproof layer shall adopt cement-based waterproof materials. 4.2.2 The design of the connection joints of fabricated underground structural components shall meet the waterproof and durability requirements. 4.2.3 The minimum impermeability grade of waterproof concrete for open-cut underground works shall meet the requirements in Table 4.2.3. 4.2.4 The waterproof fortification measures for joints of underground engineering structures by open-cut method shall comply with the provisions in Table 4.2.4. 4.2.5 The waterproofing method of the cover-excavation method shall meet the following requirements. 1 The waterproofing of peripheral devices shall comply with the provisions of Article 4.2.1 of this specification. 2 When the support structure and the roof of the main structure are rigidly connected, the waterproofing of the joint surface shall use externally coated cement-based permeable crystalline waterproofing materials. 4.2.6 The compaction coefficient of the backfill layer shall not be less than 0.94 in the range from the foundation to the 500mm above the structural bottom plate and the range of not less than 500mm above the structural roof. 4.2.7 The waterproof fortification range of the attached fully underground or semi-underground project shall be higher than the outdoor floor, and the excess height shall not be less than 300mm. 4.2.8 The waterproof design of the basement roof of civil buildings shall meet the following requirements. 1 The accumulated water in the covering soil should be drained to the surrounding soil or building drainage system; 2 The part adjacent to the above-ground building shall be provided with flashing, and the height above the covering soil or the site shall not be less than 500mm. 4.3 Underground engineering by underground excavation method 4.3.1 The waterproof method of the composite lining of underground engineering in mining method shall comply with the provisions in Table 4.3.1. 4.3.2 If there is no external waterproof layer in the inverted arch, other parts shall be provided with external waterproof layer according to the provisions of Article 4.3.1 of this code, and a drainage system shall be installed. 4.3.3 The waterproof fortification measures for the secondary lining joints of the mine method underground engineering shall comply with the provisions in Table 4.3.3. 4.3.4 The gap between the secondary lining and the waterproof layer of the vault of the mining method tunnel engineering should be filled and compacted by grouting. 4.3.5 The waterproofing of shield tunneling projects shall meet the following requirements. 1 The compressive strength grade of the concrete segment shall not be lower than C50, and the impermeability grade shall not be lower than P10. 2 The segment shall be provided with at least one gasket groove, and the segment joint gasket shall be able to be completely pressed into the segment groove. The ratio of the cross-sectional area of the gasket groove to the cross-sectional area of the gasket should not be less than 1.00 and should not be greater than 1.15. 3 The segment joint gasket shall be able to ensure no leakage under the condition of the calculated maximum opening of the joint, the maximum allowable misalignment in the design and the water head at the buried depth not less than 2 times the water pressure. 4 The shape of the rubber sealing ring of the segment bolt hole should match the groove. 4.3.6 The waterproofing of pipe jacking and box culvert jacking tunnel engineering shall meet the following requirements. 1 The pipe joints shall be provided with rubber gaskets; 2 The pipe joints shall meet the requirements for sealing and waterproofing under the maximum allowable deformation of the structure; 3 Anti-corrosion measures should be taken for the steel socket of the press head. 4.4 Building roofing works 4.4.1 The waterproofing method of building roofing works shall meet the following requirements. 1 The waterproof method of flat roof engineering shall comply with the provisions in Table 4.4.1-1. 2 The waterproofing method of the tile roof project shall comply with the provisions in Table 4.4.1-2. 3 The waterproofing method of metal roofing project shall comply with the provisions in Table 4.4.1-3.All-welded sheet metal roofing should be considered a waterproofing practice for Class I waterproofing. 4 When using a single layer of exposed waterproof membranes such as polyvinyl chloride waterproof membranes (PVC), thermoplastic polyolefin waterproof membranes (TPO), and EPDM waterproof membranes (EPDM) on the base layer of the roof metal plate, The thickness of the waterproof membrane should not be less than 1.8mm for the first grade of waterproofing, 1.5mm for the second grade of waterproofing, and 1.2mm for the third grade of waterproofing. 4.4.2 The water drainage (storage) layer of the planted roof project should be designed in conjunction with the roof drainage system, and should not be used as a root puncture-resistant waterproof layer, and an organized drainage channel should be provided to drain rainwater to the roof drainage system. 4.4.3 The drainage slope of the roof shall be determined according to the roof structure type, the type of the base layer of the roof, the waterproof structure type, the material performance and the use environment and other conditions, and shall meet the following requirements 1 The drainage slope of the roof shall meet the requirements in Table 4.4.3. 2 When structural slope finding is adopted for the roof, the slope shall not be less than 3%. 3 The longitudinal slope of concrete roof gutters and gutters shall not be less than 1%. 4.4.4 The roof shall be provided with an independent rainwater collection or drainage system. 4.4.5 The waterproof structure design of the roof project shall meet the following requirements. 1 When the equipment is placed on the waterproof layer, an additional layer should be provided. 2 Additional layers or multiple waterproofing treatments shall be provided for the waterproof layer at the flooding places of gutters, gutters, skylights, rainwater pipes and pipe wells protruding from the roof. 3 Roof rainwater gutters and gutters should not cross deformation joints, and an additional waterproof layer should be provided at the flooded part of roof deformation joints, and the waterproof layer should be paved or painted to the top surface of the deformation joint retaining wall. The high and low span deformation joints should be sealed with materials and structures with sufficient deformation capacity at the flooded part of the vertical wall. 4.4.6 The non-exposed waterproof materials shall be provided with a protective layer when exposed to use. 4.4.7 Tile roofs, metal roofs and planting roofs shall be strengthened and fixed against wind blowing and slipping according to the basic wind pressure, seismic fortification intensity and roof slope and other conditions of the project location. 4.4.8 The engineering waterproof grade of the roof gutter and the exposed roof of the closed balcony shall be consistent with the waterproof grade of the building roof. 4.4.9 When the waterproof membrane of the concrete structure roof is bonded with cement-based materials, the long side of the waterproof layer should not be greater than 45m. 4.5 Building exterior wall engineering 4.5.1 The waterproofing of the exterior wall of the building shall be designed for overall waterproofing according to the engineering waterproofing environment category in the area where the project is located. Waterproof construction measures should be taken for the openings of doors and windows on the exterior walls of buildings, awnings, balconies, parapets, outdoor pick-up plates, deformation joints, wall casings and embedded parts, and wall waterproof layers should be set according to the waterproof level of the project. 4.5.2 The waterproof layer of the wall shall meet the following requirements. 1 For the frame-fill or masonry structure external wall whose waterproof grade is Class I, two or more waterproof layers shall be arranged. Frame-filling or masonry exterior walls with a waterproof rating of Class II shall be provided with one or more waterproof layers. When 2 layers of waterproofing are used, 1 layer of waterproof mortar and 1 layer of waterproof paint or other waterproof materials should be provided. 2 For the cast-in-place concrete exterior walls and prefabricated concrete exterior wall panels with a waterproof grade of Class I, one or more waterproof layers shall be provided. 3 The closed curtain wall shall meet the first-class waterproof requirements. 4.5.3 The joint structure of door and window openings and the performance of doors and windows shall meet the following requirements.

1 The gap between the door and window frame and the wall should be embedded and sealed with waterproof sealing material

2 Drip lines shall be set on the lintels of door and window openings; 3 The performance and installation quality of doors and windows shall meet the watertightness requirements; 4 Drainage structural measures such as drainage boards and drip lines shall be provided at the window sills, and the drainage slope shall not be less than 5%. 4.5.4 Waterproof methods such as awnings, balconies, and outdoor decking shall meet the following requirements. 1 The canopy should be provided with external drainage, the slope should not be less than 1%, and the lower edge of the external opening should be a drip line. The waterproof layer at the junction of the awning and the outer wall should be continuous, and the waterproof layer should be turned down along the outer opening to the drip line. 2 The floors of open verandahs and balconies shall be equipped with a waterproof layer, and the drainage slope of the balcony slope to the drain outlet shall not be less than 1%, and shall be connected to the drainage system through the rainwater standpipe, and grooves shall be embedded and sealed around the drain outlet Material. The lower edge of the balcony's outer opening should be a drip line. 3 The connection between the outdoor pick-up plate and the wall shall take anti-rainwater backflow measures and joint structure waterproof measures. 4.5.5 The waterproofing of joints such as external wall deformation joints, wall-penetrating pipes, and embedded parts shall meet the following requirements 1 Waterproof strengthening measures shall be taken for the deformation joints. When adopting the measures of adding an additional layer of coiled material, both ends of the coiled material should be fully glued to the wall, the width of which should not be less than 150mm, and should be nailed and fixed, and the end of the coiled material should be sealed with a sealing material. 2 The pipes passing through the wall shall take measures to avoid rainwater inflow and waterproof sealing measures inside and outside. 3 The surroundings of embedded parts and prefabricated parts of external walls shall be continuously sealed with waterproof sealing materials. 4.5.6 Strengthening measures shall be taken for the node structure of the door and window openings, awnings, balconies, wall-through pipes, deformation joints, etc. 4.5.7 The joints of the exterior walls of prefabricated concrete structures and the joints between door and window frames and walls shall be sealed with sealing materials, water-stop materials and special waterproof accessories. 4.6 Architectural Interior Engineering 4.6.1 The ground waterproofing method of indoor buildings shall comply with the provisions in Table 4.6.1. 4.6.2 There should be no less than one waterproof layer on the indoor wall. 4.6.3 The floor of the building with waterproof requirements shall have a drainage slope, and the slope shall face the floor drain or drainage facilities, and the drainage slope shall not be less than 1.0%. 4.6.4 There should be measures to prevent water from flowing into non-water rooms at the junction of the water space and the floor of the non-water space. The height of the waterproof layer on the wall in the shower area should not be less than.2000mm, and should not be lower than the height of the shower nozzle. The height of the waterproof layer on the wall surface of the washbasin and other water places should not be less than 1200mm. The flooding height of other parts of the wall shall not be less than 250mm. 4.6.5 The ceiling of the wet space shall be equipped with a moisture-proof layer or adopt moisture-proof materials. 4.6.6 The waterproof structure design of indoor works shall meet the following requirements. 1 The pipe root of the floor drain should be sealed and waterproof;

2 The space between the pipe casing and the pipe passing through the floor or wall shall be embedded and compacted with waterproof sealing material

3 The waterproof casing passing through the floor should be higher than the finished surface of the decorative layer, and the height should not be less than 20mm. 4.6.7 The indoor areas that need to be waterproofed should not cross the deformation joints and other parts that may have large deformations. 4.6.8 Waterproof and drainage measures shall be taken on the floor of the structural floor where the integrally assembled bathroom is used. 4.7 Road and Bridge Engineering 4.7.1 The deck of the bridge project should be provided with a waterproof layer, and should have a complete waterproof and drainage system, and the pavement of the asphalt concrete bridge deck should also be equipped with a seepage drainage system. 4.7.2 The waterproof material of the bridge deck shall be selected according to the structural characteristics of the bridge, traffic load, environmental climate, construction conditions and other factors. When choosing a waterproof membrane or waterproof coating, the high temperature stability, low temperature flexibility and aging resistance of the material should also be compatible with the engineering application conditions. 4.7.3 The waterproof system of the bridge deck pavement shall be determined according to the bridge structure, bridge deck pavement surface material, waterproof environment category, etc., and shall meet the following requirements. 1 When the pavement material of the concrete bridge deck is asphalt concrete surface course, waterproof membrane or waterproof coating should be used for the waterproof layer. For bridges with a waterproof grade of Grade I, the thickness of the asphalt concrete surface paved on the membrane waterproof layer shall not be less than 80mm. 2 When the pavement material of the concrete bridge deck is the cement concrete surface course, the waterproof membrane should not be used for the waterproof layer. 3 Between the steel plate of the orthotropic steel deck and the pavement material, an anti-corrosion layer and a waterproof bonding layer should be set. 4.7.4 The node structure design of bridge deck waterproofing shall include surface structure joints, bridge expansion joints, outfall devices and other parts, and shall meet the following requirements. 1 The structural joints of the cement concrete paving surface or the concrete leveling course on the bridge deck shall be filled with waterproof sealing materials. 2 The ends of the waterproof layer on both sides of the bridge's secondary shrinkage joints and the post-cast concrete of the expansion joints shall be sealed with waterproof sealing materials. 3 The seepage drainage hole shall be set in the bridge deck outlet device, and its lower edge shall be lower than the waterproof layer and covered with geotextile. The connection between the waterproof layer and the periphery of the drain outlet device shall be sealed with waterproof sealing material. 4.7.5 Road and bridge projects shall be provided with a drainage system that meets the rainwater design return period. 4.8 Water storage projects 4.8.1 The waterproofing of concrete structure water storage works shall adopt the construction method of structural waterproof concrete plus external waterproof layer, and shall meet the following requirements. 1 For concrete structure water storage projects in a non-aggressive medium environment, the strength grade of waterproof concrete should not be lower than C25, and the design impermeability grade, minimum thickness, allowable crack width, and minimum thickness of steel protection layer of waterproof concrete should comply with Table 4.8.1 provisions. When the water storage project is an underground structure, the thickness of the roof shall not be less than 250mm. 2 For water storage projects with a waterproof grade of Class I, at least one waterproof layer shall be arranged on the inner wall. For water storage projects with a waterproof grade of Level II, a waterproof layer shall be installed on the inner wall. Waterproof material should choose waterproof coiled material, waterproof coating or cement-based waterproof material. 3 For concrete structure water storage projects that have hygienic requirements for water storage quality, a waterproof layer on the outer wall should be added, and at least one waterproof layer of waterproof coiled material, waterproof coating or cement-based waterproof material should be installed. 4.8.2 The structural design of waterproof joints of concrete structure water storage projects shall include deformation joints, induced joints, construction joints, post-casting belts, wall-penetrating pipes, orifices and other parts, and shall meet the following requirements 1 The waterproof structure of deformation joints, induction joints, construction joints and post-casting belts of concrete structures shall comply with the provisions of Article 4.2.4 of this code; 2 Waterproof sleeves should be installed at the part where the pipes pass through the wall. The diameter of the sleeve should be 50mm larger than the diameter of the pipe. The gap between the sleeve and the pipe should be sealed, and the sealant should be filled around the port; 3 The various orifices leading to the ground in the underground pool shall take anti-backflow measures, and the elevation of the orifice above the outdoor floor shall not be less than 300mm. 4.8.3 Water storage projects shall not be built with blocks or hollow blocks made of materials subject to water erosion. In areas where the average temperature of the coldest month is lower than -3°C, exposed water storage projects should not adopt masonry structures. 4.8.4 For the original water body where an anti-seepage layer needs to be installed, the anti-seepage layer should be laid with materials such as clay, flexible waterproof material or natural sodium bentonite waterproof blanket, and there should be no less than one layer. 4.8.5 Need to guard against...

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