Search result: GB 55022-2021
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| GB 55022-2021 | English | 1019 |
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(General Code for Building Security and Renovation)
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GB 55022-2021
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| Standard ID | GB 55022-2021 (GB55022-2021) | | Description (Translated English) | | | Sector / Industry | National Standard |
GB 55022-2021 English name.(General Code for Building Security and Renovation)
1 General
1.0.1 In order to protect personal health, life and property safety, public safety, and ecological environment safety in the maintenance and renovation of existing buildings, and meet the basic needs of economic and social management, this specification is formulated in accordance with relevant laws and regulations.
1.0.2 The maintenance and renovation of existing buildings must implement 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 Existing buildings are not allowed to modify the main structure of the building and change the use function without approval.
2.0.2 The existing buildings should determine the maintenance period and carry out periodic inspections.
2.0.3 The maintenance of existing buildings shall comply with the following basic regulations.
1 The use function of the building shall be guaranteed;
2 The building should be maintained to reach the design working life;
3 The safety and disaster resistance performance of the building shall not be reduced.
2.0.4 The renovation of existing buildings shall comply with the following basic regulations.
1 It should meet the safety requirements of the building after renovation;
2 The disaster resistance performance of the building shall not be reduced;
3 The durability of the building shall not be reduced.
2.0.5 Site survey should be carried out before the maintenance and renovation of existing buildings, and a maintenance plan or repair and renovation design should be made according to the specific characteristics of the building. Before construction, the construction organization design should be compiled, targeted safety protection measures should be formulated, and emergency plans should be prepared.
2.0.6 During the construction of existing building maintenance and renovation projects, the safety and health of relevant personnel shall be guaranteed.
2.0.7 During the construction of existing building maintenance and renovation projects, the operating area, dangerous area and adjacent affected area of the project should be distinguished, safety warnings and guiding signs should be set up, and corresponding safety protection measures should be taken.
2.0.8 Fire safety shall be ensured at the construction site, temporary electricity management shall be done according to the current system, and the hot fire approval system shall be strictly implemented.
2.0.9 During the maintenance and renovation of existing buildings, termite damage shall be checked; when termite damage is found, termite damage assessment and control shall be carried out on the house.
2.0.10 During the construction of existing building maintenance and renovation projects, effective measures shall be taken to control the impacts caused by dust, waste gas, waste, noise and vibration on the construction site.
2.0.11 Quality control should be carried out for existing building maintenance and renovation projects. After the project is completed, it should be checked and accepted.
2.0.12 For existing building maintenance and renovation projects, the data of each link of the project should be collected and sorted out in time, and project files should be established and improved. Relevant archives should be kept properly; when the management right of an existing building is handed over, relevant archives of the building should be handed over at the same time.
3 checks
3.1 General provisions
3.1.1 The inspection of existing buildings shall be carried out separately for buildings, structures and facilities and equipment. Inspections are divided into routine inspections and specific inspections.
3.1.2 In the process of daily use and maintenance, regular daily inspections should be carried out on the use environment, damage and operation conditions of existing buildings, and the inspection cycle should not be less than once a year.
3.1.3 Before and after the rainy season, heating season, and special environments such as typhoon, heavy rain, heavy snow and strong wind, specific inspections should be carried out on existing buildings.
3.1.4 Existing buildings should be evaluated according to the inspection results after inspection, and inspection and appraisal should be carried out when the following situations exist.
1.Defects, deformations and damages that endanger the safety of use are found;
2 It is intended to continue to use after reaching the design working life;
3 Before rectification and transformation;
4 Before changing the purpose or use environment;
5 is greatly affected by natural disasters, man-made disasters, environmental changes or accidents;
6 The safety, usability and system performance of the equipment system do not meet the relevant regulations and requirements;
7 The change of use function leads to the improvement of the building's anti-seismic fortification category.
3.1.5 For the inspection of different professions, categories or types in existing buildings, appropriate methods should be selected, the content should be clarified, and reasonable plans should be formulated.
3.1.6 Before the inspection of existing buildings, relevant data such as survey and design, construction, monitoring, acceptance, previous inspections and assessments, maintenance and renovation of buildings, structures and facilities and equipment should be collected.
3.1.7 The assessment of existing buildings should be based on true and reliable inspection results, testing data, information and analysis.
3.1.8 For the damage found in the inspection and evaluation of existing buildings, treatment measures such as repair, renovation, replacement or abandonment should be taken according to the degree of damage; before the above measures are taken, measures to stop use or temporarily relieve danger should be taken in time.
3.2 Building inspection
3.2.1 The daily building inspection shall include the following main contents.
1 Leakage and damage of the roof;
2 Deformation and damage of parapet, roof chimney, auxiliary structures, etc.;
3 Cracking, leakage, hollowing and falling off of the exterior wall finish;
4 Sealing and damage of external walls, doors, windows, curtain walls and other enclosure structures, as well as defects, deformations and damages connected with the main structure;
5 Damage to additional facilities on building facades such as awnings, awnings, air-conditioning racks, clothes racks, window sill flower racks, and lightning protection devices, as well as defects, deformations, and damages connected to the main structure;
6 The defect, deformation and damage of the connection between interior decoration and main structure.
3.2.2 The building-specific inspection shall include the following main contents.
1 Waterproof and drainage conditions when the rainy season is approaching;
2 When the heating season is approaching, the sealing of external doors, windows and curtain walls;
3 Before and after typhoons, heavy rains, heavy snow and strong winds, etc., the damage of external wall insulation layer, decorative parts, deformation joint cover plates, external wall doors and windows, curtain walls, etc., and the defects, deformation and damage of their connections;
4 When the rainy season is approaching, the entrances and exits of underground buildings, patios, air wells, etc. are protected from rainwater backflow.
3.2.3 On the basis of daily inspection and specific inspection contents, when assessing the status quo of the building, the following contents shall be included.
1 Evaluate the safety and applicability of the enclosure system according to the structure of the roof waterproof layer and insulation layer, the structure of the external insulation system of the exterior wall, the fire performance, and the degree of damage to the enclosure structures such as exterior doors, windows, and curtain walls;
2 Evaluate the safety and usability of interior decoration according to the finishes of beams, columns, panels, walls and other components and the fire prevention measures of interior decoration;
3 Evaluate the fire safety of buildings based on evacuation passages, safety exits, fire exits, fire and smoke prevention partitions, and fire separation distances;
4 Evaluate the flood control safety of underground buildings according to the reliability and effectiveness of rainwater backflow prevention facilities such as entrances and exits of underground buildings, window wells, and air wells.
3.3 Structural inspection
3.3.1 The daily structural inspection shall include the following main contents.
1 Changes in service load of the structure;
2 Changes in the surrounding environment of the building and overall and local deformation of the structure;
3 Defects, deformations and damages of structural components and their connections.
3.3.2 The structure-specific inspection shall include the following.
1 Defects, deformations, and damages of roofs, support systems and their connection nodes before and after typhoons, heavy snow, and strong winds;
2 Before and after the rainstorm, the ground around the existing building deformed, the surrounding landslides, the foundation sank, and the structure tilted and deformed.
3.3.3 On the basis of routine inspection and specific inspection content, the status quo of the structure should be assessed.
3.4 Inspection of facilities and equipment
3.4.1 The daily inspection of facilities and equipment shall include the following main contents.
1 The working environment where the facilities and equipment are located;
2 Aging, leakage, and damage to the protective layer of facilities and equipment, electrical lines, auxiliary pipelines, pipes, valves and their connected materials;
3 Abnormal vibration and noise in system operation.
3.4.2 The specific inspection of facilities and equipment shall include the following main contents.
1 When the rainy season is approaching, the integrity of the roof, outdoor drainage equipment, and lightning protection devices;
2 When the heating season is approaching, the operation status and safety of heating equipment and systems, as well as the integrity of water supply, drainage, heating, fire protection pipelines and system antifreeze measures;
3 Before and after typhoons, heavy rains, heavy snow and strong winds, etc., the conditions of facilities and equipment, auxiliary pipelines, pipes, valves and their connections;
4 When the rainy season is approaching, the condition of the underground building water retaining and drainage facilities and equipment is in good condition.
3.4.3 The evaluation of facilities and equipment shall include the following main contents.
1 The effectiveness and safety of the normal operation of the facilities and equipment systems;
2 Durability of facilities and equipment, auxiliary pipelines, pipelines and their connecting materials;
3 Effectiveness of protective measures such as heat preservation, antifreeze, electric shock, high temperature, radiation, fire, lightning, pollution, and disinfection for facilities and equipment, auxiliary pipelines, pipelines and their connections.
3.4.4 For water supply and drainage equipment, the assessment of water supply and drainage capacity, leakage and damage of pipes and valves shall be carried out.
3.4.5 For heating facilities and equipment, the assessment of pipeline insulation measures, system supply capacity, equipment and pipeline pressure bearing capacity shall be carried out.
3.4.6 For ventilation and air-conditioning equipment, the air volume of the air duct and system, the water flow of the air-conditioning unit, and the heating (cold) supply shall be evaluated.
3.4.7 For electrical facilities and equipment, the integrity of (transformation) power distribution devices, the function of automatically cutting off the power supply when an electrical fault occurs, and the assessment of facilities such as lightning protection and grounding devices should be carried out.
3.4.8 For building intelligent systems, inspections and assessments of information facility systems, information application systems, security systems, and intelligent integration systems should be carried out regularly.
3.4.9 Fire-fighting facilities and equipment such as automatic fire alarm system, fire hydrant system, automatic sprinkler system, gas fire extinguishing system, smoke control system, emergency lighting and evacuation instructions shall be inspected and evaluated at least once a year.
3.4.10 For existing buildings that are greatly affected by natural disasters and man-made disasters, the safety and effectiveness of the operation of facilities and equipment should be evaluated with emphasis.
3.4.11 For existing underground buildings that are at risk of being flooded by rainwater, the safety and effectiveness of the operation of flood control facilities and equipment should be evaluated with emphasis.
4 repairs
4.1 General provisions
4.1.1 Existing buildings should be periodically repaired in accordance with the house repair plan and based on the house inspection and assessment results. When an emergency occurs that endangers the use of the house and the safety of personal and property, emergency repairs should be implemented immediately.
4.1.2 Existing buildings should be repaired in time when any of the following problems affecting the safety of use or public safety are found through inspection and assessment.
1 abnormal deformation of the building;
2 Structural components are damaged and the bearing capacity is insufficient;
3 There is a risk of falling off the building exterior finish and insulation layer;
4 Leakage of external protection systems such as roofs, exterior walls, doors and windows;
5 failure of fire-fighting facilities;
6 The operation of the water supply pump is interrupted, and the facilities and equipment fail;
7 Blockage and bursting of drainage facilities;
8 The components and lines of the power system are aging, resulting in safety risks;
9 Failure of lightning protection facilities;
10 Underground buildings are flooded by rainwater;
11 The external environmental factors cause the building not to be used normally.
4.1.3 When carrying out emergency repairs, the danger of the house should be removed in time through measures such as risk elimination and reinforcement.
4.1.4 Before the repair of existing buildings, professional technicians should conduct on-site investigation and assessment of their current situation, and should collect original design and reconstruction and expansion drawings, usage conditions and repair reports, repair data over the years, house safety inspection and evaluation, etc. According to the inspection, survey and evaluation results, the repair design will be carried out, and then the repair will be carried out.
4.1.5 The repair design documents shall include design basis, description of repair requirements and methods, repair content, repair materials and quantity description, etc., and shall be expressed and recorded in writing, symbols, drawings, etc. according to the complexity of the repair content.
4.2 Building renovation
4.2.1 In the repair of existing building leakage, the cause of the leakage should be found out and a repair plan should be formulated according to the waterproof level of the house, the use requirements, the amount of leakage, and the location; the repair should also check the firmness of the structure, base and insulation, leveling, etc., if there is a defect, it should be reinforced first and then repaired.
4.2.2 The roof repair of existing buildings shall comply with the following regulations.
1 The structural members of the roof should be inspected first and the damaged parts should be repaired. For the joints between buildings (structures) protruding from the roof and the roof, waterproof materials or sealing materials should be used for waterproof treatment.
2 Sloping roof tiles should be effectively connected with the structural components and be solid; when leakage occurs in roof ridges, flashings, gutters, skylights, downpipes, etc., they should be repaired or replaced.
3 When the waterproof layer of the flat roof cracks and shells, and the waterproof layer of the platform and awning cracks and shells, the damaged thermal insulation layer should be repaired or replaced.
4 When the joints of the metal roof panels, the joints of the lighting panels and the fixing bolts leak, repairs should be carried out, such as repairing the bent roof panels, tightening the bolts, re-laying waterproof membranes or painting waterproof paint to ensure No leaks.
4.2.3 The cleaning and maintenance of the exterior walls of existing buildings shall comply with the following regulations.
1 Do not use strong acid or alkali cleaning agents and toxic and harmful chemicals for cleaning and maintenance;
2.During cleaning and maintenance operations, professional cleaning equipment, tools and safety measures should be used, and simultaneous operations on the top and bottom in the same vertical direction are not allowed.
4.2.4 The renovation of exterior walls of existing buildings shall comply with the following regulations.
1 For plastering and painting external wall repairs, repairs should be carried out from the inside to the outside in accordance with the order of the base, surface, and coating; between the new and old plasters, and between the surface and the base should be firmly bonded ;
2 Weathering of clear water walls, loosening of mortar joints, breakage and leakage, and irregular joints should be repaired completely. If the weathered area is too large, full complements and inlays should be carried out;
3.If the facing layer and mortar layer of the exterior wall are loose, shelled, or cracked, they should be partially chiseled off and then resurfaced. If there is a danger of falling, they should be repaired in time.
4.2.5 The external thermal insulation repair of the exterior walls of existing buildings shall comply with the following regulations.
1 When there are cracks, water seepage, hollowing, falling off and other problems in the external wall insulation system, it should be repaired in time;
2 A special plan for construction fire prevention should be formulated during repair;
3 Before the repair, the safety inspection of the external wall hangings in the repair area should be carried out. When the strength of the external wall hangings is insufficient or the connection with the wall is not firm, reinforcement measures should be taken or removed or replaced.
4.2.6 The renovation of various types of curtain walls such as glass, metal and stone in existing buildings shall meet the following requirements.
1 The embedded parts and connecting parts should be derusted and anti-corrosion treated first, and the loose connection should be fastened to ensure the reliable connection between the curtain wall and the main structure;
2.When the sealant or sealant strip falls off or is damaged, it should be repaired or replaced. The sealant for repair must be used within the validity period and pass the inspection test. It is strictly forbidden to use construction sealant as a silicone structural sealant;
3.When doors and windows fail to open or close or accessories are damaged, they should be repaired or replaced in time. When glass, metal or stone panels are damaged, protective measures should be taken and replaced in time.
4.2.7 When the indoor and outdoor doors, windows or accessories of existing buildings are inconvenient to close and open, deformed, loosened, corroded, etc. and affect normal use, they should be repaired, removed or replaced, and the door and window glass should meet the thickness and safety requirements.
4.2.8 The repair of external wall hangings such as pipes attached to the wall of existing buildings, various erections, signboards, awnings, etc. shall be designed in an overall manner and shall comply with the following regulations.
1 When the hanging objects on the external wall are loose, rusted, severely corroded, damaged, etc., resulting in insufficient strength and bearing capacity, or the connection with the wall is not firm enough to affect safety, it should be repaired or replaced;
2 When the slope of rainwater pipes and condensate pipes is improper, there are reverse water joints, water leakage, water accumulation at the joints, loose connection between the elevator card and the pipes, etc., repairs should be carried out;
3 When there is water leakage at the contact between the light awning and the drape and the wall, it should be repaired;
4 When the safety glass on the overhanging component is damaged, it should be repaired with safety glass.
4.2.9 If the interior decoration surface and base of existing buildings are not firm, they should be reinforced; when the facing bricks, decorative panels, and suspended ceilings crack or fall off, they should be repaired or replaced.
4.2.10 Solvent-based waterproof coatings shall not be used in building interior waterproofing works.
4.2.11 The renovation of indoor stairs in existing buildings shall comply with the following regulations.
1 When the stairs, railings and handrails are cracked, deformed, incomplete, loose, desoldered, rusted or decayed, the damaged parts should be partially repaired or replaced as a whole;
5 renovation
5.1 General provisions
5.1.1 Before the reconstruction of existing buildings, according to the requirements and objectives of the renovation, the involved site environment, building history, structural safety, fire safety, personal safety, thermal engineering of the enclosure structure, sound insulation, ventilation, lighting, sunshine, etc. Physical performance, indoor environment comfort, pollution status, safety and performance of electromechanical equipment, etc. are inspected and evaluated or tested and identified.
5.1.2 The renovation of existing buildings shall be designed according to inspection or identification results.
5.1.3 During the reconstruction of existing buildings, damage to the original structural load-bearing components should be avoided, and if it is really necessary to change, it should be dealt with effectively.
5.2 Building renovation
5.2.1 For the renovation of existing buildings, a design scheme for the renovation project should be prepared, and the scheme should clearly define the scope, content and relevant technical indicators of the renovation.
5.2.2 In the renovation design of existing buildings, if the spacing of buildings within the renovation range and the related spacing of buildings outside the renovation range are changed, the spacing should not be lower than the requirements of the fire protection spacing standard.
5.2.3 Existing buildings should be combined with reconstruction to eliminate hidden fire safety hazards. According to the building’s use function, space and plane features, and the characteristics of users, the fire resistance of main components of the building should be improved according to local conditions, fire separation should be strengthened, evacuation facilities should be added, and fire protection should be improved. Reliability and availability of facilities.
5.2.4 After the renovation of existing buildings, the new or renovated barrier-free facilities should be connected with the surrounding barrier-free facilities.
5.2.5 The transformation of existing buildings from level to slope shall comply with the following regulations.
1.The form and slope of the sloping roof should be selected according to the original roof condition and the surrounding environment to ensure its thermal insulation effect and structural safety;
2 The original flat roof drainage system shall be used and shall be unobstructed;
3 Lightning protection measures shall be taken on the sloping roof, and the original lightning protection device shall be used;
4 The space under the roof of the new slope is strictly prohibited from being piled up or used for other purposes.
5.2.6 Complete renovation of existing residences shall meet the following requirements.
1 When changing the original structure, it should be appraised first to eliminate potential safety hazards and ensure structural safety;
2 The original space should be intensively used, the plane and space layout should be adjusted reasonably, kitchen and bathroom facilities and equipment should be added, and the complete set of functions of the house should be improved.
5.2.7 When retrofitting an existing multi-storey residence with an elevator, the elevator should not be arranged adjacent to the bedrooms. When the living room needs to be arranged adjacent to it due to limited conditions, effective sound insulation and vibration reduction measures should be taken.
5.2.8 When the roof load is increased or the use function of the existing building is changed, the design scheme or evaluation report should be made first.
5.2.9 When greening the roof of an existing building and adding solar energy, lighting, ventilation and other roof facilities, the load-bearing safety and protection safety of the roof should be ensured, and the effectiveness of the lightning protection facilities should not be damaged.
5.2.10 During renovation of existing buildings, indoor environmental pollution shall be strictly controlled, and construction materials prohibited or restricted by the state shall not be used.
5.3 Structural modification
5.3.1 For the structural renovation of existing buildings, the function of use after renovation and the service life of subsequent design shall be clearly defined. During the follow-up design work period, the purpose and use environment of the reconstructed structure shall not be changed without inspection and appraisal or design permission.
5.3.2 The structural reconstruction of existing buildings shall carry out seismic identification and design, and shall comply with the following regulations.
1 The seismic fortification classification shall be determined according to the function and importance of existing buildings;
2 The follow-up design working life and corresponding seismic identification method shall be determined according to actual needs and renovation expectations;
3 The calculation model shall be established according to the status of the structure after reconstruction, and the structural analysis and seismic identification shall be carried out. The original structure that does not meet the requirements shall be targeted for seismic reinforcement;
4 The structure of the newly added part in the reconstruction shall be subjected to seismic design.
5.3.3 When the bearing capacity of the original structure is insufficient, the structure should be reinforced first.
5.3.4 When the existing building structure is reconstructed, the impact on the original foundation shall be considered when the new foundation is established. In addition to meeting the requirements of the bearing capacity of the foundation, the foundation deformation check calculation should be carried out according to the deformation coordination principle, and the impact of the new foundation construction on the existing building foundation should be evaluated at the same time.
5.3.5 When the roof of an existing building is transformed from flat to slope, the structural form of the sloping roof should be reasonably selected according to the specific conditions of the house, light and high-strength materials should be used, and there should be reliable connections between the old and new components. Wind and snow bearing capacity requirements.
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Similar standards: GB 55031 GB 55030
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