CJJ/T 53-1993 Construction regulations for civil housing repair projects
Some standard content:
Engineering Construction Standard Full Text Information System
Industry Standard of the People's Republic of China
The Repairing Construction Codefor Civil Builing
CJJ/T53-93
1994Beijing
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Industry Standard of the People's Republic of China
The Repairing Construction Codefor Civil Builing
CJJ/T53-93
Editing Unit: Tianjin Real Estate and Housing Research Institute Approving Department: Ministry of Construction of the People's Republic of China Effective Date: November 1, 1993
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Notice on the release of the industry standard "Construction Specifications for Civilian Housing Renovation Projects"
Jianbiao [1993] No. 333
According to the requirements of the Ministry of Construction (89) Jianbiao Jizi No. 8 document, the "Construction Specifications for Civilian Housing Renovation Projects" edited by the Tianjin Real Estate and Housing Science Research Institute has been reviewed and approved as an industry standard, numbered CJJ/T53-93, and will be implemented from November 1, 1993. This standard is managed by the Shanghai Housing Science Research Institute, the technical unit of the Ministry of Construction's real estate standards, and the editorial unit is responsible for specific interpretations, etc. The Ministry of Construction's Standards and Norms Research Institute organizes the publication.
Ministry of Construction of the People's Republic of China
May 3, 1993
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1 General Principles
2 Foundation and Foundation Engineering
2.1 General Provisions
2.2 Foundation Reinforcement
2.3 Foundation Expansion
2.4 Building Correction
Light Light Light||t 3.1 General provisions 3.2 Brick wall demolition and reconstruction 3.3 Brick wall removal and reconstruction +ooeoe++666o6966006o600000000066e+0***************66******* 3.4 Brick wall hollowing and reconstruction 5 Brick wall hollowing and demolition openings 3.6 Brick wall hollowing and replacement of moisture-proof layer (belt) 3.7 Brickwork reinforcement and strengthening 3.8 Condensation repair on inner surface of exterior wall 4. Concrete structure engineering 4. General provisions.
4.2 Combination of new and old concrete, connection of new and old steel bars4.3 Concrete slabs
4.4 Balconies and canopies
4.5 Concrete beams
4.6 Concrete columns
4.7 Addition of reinforced concrete ring beams and steel tie rods4.8 Additional wall columns
4.9 Pressure grouting to repair cracks
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4.10 Spraying cement mortar
4.11 Gluing steel for building structure
5 Steel structure engineering
5.1 General provisions
5.2 Steel components
5.3 Maintenance and fire protection of steel structure
Wood structure engineering.
6.1 General provisions
6.2 Wooden beams
6.3 Wooden trusses...
6.4 Wooden columns
6.5 Other wooden components
Roofing and waterproofing engineering
7.1 General provisions
7.2 Tile roof*
7.3 Rolled roof
7.4 Rigid roof
|7.5 Key parts of the roof
7.6 Roof insulation layer
7.7 Roof drainage system
7.8 External wall leakage·
7.9 Basement waterproofing
7.10 Kitchen and bathroom floor leakage
8 Decoration engineering
8.1 General provisions...
8.2 Plain wall...·
·3 Plastering and finishing layer
·4 Wallpapering, painting, coating
..5 Glass
8.6 Wood decoration
9 Door and window engineering
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(47)
(52)
中+++中
(54)
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(55)
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(62)
Engineering Construction Standard Full Text Information System
9.1 General provisions
9.2 Wooden doors and windows.
9.3 Steel doors and windows
9.4 Aluminum alloy doors and windows
9.5 Steel courtyard doors, railings, sliding and folding doors...10 Floor and ground engineering
10.1 General provisions
10.2 Cushion and leveling layer
10.3 Surface layer
11 Water, sanitation, heating and ventilation engineering
11.1 General provisions
11.2 Water supply pipes
11.3 Drainage pipes
11.4 Sanitary appliances
11.5 Heating pipes
11.6 Heating equipment
11.7 Heating boilers and ancillary equipment
11.8 Ventilation ducts
Electrical engineering
General provisions
12.2 Lighting circuits
12.3 Low-voltage electrical appliances
12.4 Lighting fixtures
12.5 Lightning protection and grounding devices
Appendix A
Appendix B
Appendix C
Appendix D
Appendix E
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（69)
（85)
Epoxy resin adhesive and epoxy resin mortar mix ratio (87)
Pressure grouting reinforcement brick wall crack slurry mix ratio Pressure grouting repair concrete crack slurry mix ratio
This Explanation of terms used in the regulations
Additional explanation
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1 General Principles
This regulation is formulated to implement the state's technical and economic policies in the construction of housing repair projects, achieve advanced technology, reasonable economy, safety and applicability, ensure quality, restore and improve the use functions of existing houses and equipment, and extend the service life of houses and equipment.
Construction.
This code applies to the renovation of existing low-rise and multi-story houses in urban areas. The construction of house renovation projects should be prepared according to the survey and design, and the construction organization design or construction plan should be formulated to reasonably use old materials, shorten the construction period, and minimize disturbance to users. It should also comply with the following provisions:
Before the renovation, the structure and repair parts of the existing house should be reviewed. If unsafe structures and components are found, technical treatment measures should be taken in time to ensure safety.
The relevant facilities and houses affected by the renovation should be properly handled first. 1.0.3.2 When it is found that the current status of the house does not conform to the survey and design or abnormal conditions occur, the design should be modified after research with the survey and design department before construction can be carried out. 1.0.3.3 During the renovation, the quality acceptance of the concealed works should be carried out according to the relevant standards before the next construction process can be started. 1.0.4 In addition to complying with this code, the construction of house renovation projects and fire prevention, explosion prevention, poison prevention, dust prevention, pollution prevention, labor protection, etc. should also comply with the provisions of the current relevant national standards. Engineering Construction Standards Full-text Information System
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Foundation and Foundation Engineering
2.1 General Provisions
This chapter applies to foundation reinforcement, base reinforcement and house correction and other repair projects. Before the repair and construction, the following information must be available: (1) Engineering geological and hydrogeological data;
(2) Survey and design drawings or instructions;
(3) Underground and aerial pipeline diagrams near the repair and construction project; (4) Repair and construction organization design or construction plan and technical measures; (5) Necessary test and inspection data.
2.1.3 Before the repair and construction, technical measures must be taken for the upper load-bearing structure to ensure the integrity of the house and construction safety.
2.1.4 During the repair and construction process, observation and monitoring must be strengthened. If abnormal settlement, tilt, cracking, etc. of the building are found, the survey and design department should be contacted immediately to take emergency technical safety measures.
Repair and construction should have a construction log and records of the building's tilt, cracks, and settlement. After the completion and acceptance of the foundation, the relevant engineering projects damaged during the construction should be repaired in a timely manner.
Foundation reinforcement
1 The compaction grouting construction shall comply with the following provisions: 2.2.1
2.2.1.1 For cement slurry preparation, ordinary Portland cement with a grade not less than 325 should be used.
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Mixed cement slurry shall comply with the provisions of the current "Standard for Water for Concrete Mixing". When using non-drinking water, it should not contain harmful impurities such as grease, sugar and suspended matter. Sewage, acidic water with a pH value of less than 4, and water with a sulfate content of more than 0.10% and a chloride content of more than 0.50% shall not be used.
2.2.1.3 To improve the performance of cement slurry, admixtures should be added, and the amount should be selected according to Table 2.2.1.3.
Amount of cement slurry admixtures
Accelerator
Chemical reagents
Calcium chloride
Sodium silicate
Table 2.2.1.3
Amount (% of cement weight)
1 The water-cement ratio of cement slurry should be 1-2, and it should be filtered. The particles2.2.1.4
should not be larger than 0.1mm. The slurry should have good fluidity, and its diffusion radius should meet the requirements of the survey and design.
The pouring procedure should be based on the aperture, depth, and hole spacing designed by the survey and design. The orifice pipe should be drilled once in the order of outer2.2.1.5
surrounding the hole first, and then the inner surrounding hole. After the slurry pipe is connected, grouting should be carried out; the grouting pressure should not be less than 0.30-0.60MPa. The setting time of cement slurry should be controlled within 2-4h. If necessary, the pressure, diffusion radius, setting time, etc. should be tested first. 2.2.1.6
During construction, when the pressure is abnormal, there is no grouting or the grouting volume exceeds 20%, the cause should be found out together with the survey and design department and corresponding measures should be taken. 2.2.1.7 The grouting holes should be numbered in sequence. When grouting, the time, injection volume, depth, pressure and other records should be kept.
After the project is completed, it should be inspected by a qualified inspection unit and a written report should be obtained as an acceptance certificate.
2.2.2 The construction of anchor static pressure piles should comply with the following regulations: 2.2.2.1 Before the pile construction, the foundation pit should be dug and cleaned according to the survey and design requirements, and drainage should be done if necessary.
2.2.2.2 The pile hole should be excavated into an inverted trumpet shape by machinery and manual labor, and the position should be accurate. The anchor holes at the four corners of the pile hole should be drilled by machinery and must be consistent with the anchor holes of the pile frame. Engineering Construction Standard Full Text Information System
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2.2.2.3 The pull-out anchor rod shall be buried in the drilled concrete structure foundation and firmly bonded with epoxy resin adhesive or epoxy resin mortar. The anchor rod hole depth shall not be less than 10 times the anchor rod diameter. The preparation of epoxy resin adhesive and epoxy resin mortar is shown in Appendix A Table A-1.
2.2.2.4 The production of pile segments must comply with the survey design and relevant standards. The end surface shall be flat; a dowel hole shall be left at the upper end and dowels shall extend from the lower end. Precast piles shall be connected in sections and anchored with sulfur mortar. The mix ratio and preparation of sulfur mortar are shown in Appendix A Table A-2.
2.2.2.5 The pile frame shall be firmly fixed to the anchor rod. When the pile is pressed, the jack and the pile axis must coincide with each other. The pile pressing construction shall be carried out symmetrically while keeping the force balance of each rod. 2.2.2.6 When driving the pile, it is not allowed to stop midway, and the work should be continued. When the driving pile reaches 1.5 times the designed single pile bearing capacity, the pile should be anchored to the foundation. 2.2.2.7 Before anchoring the pile to the foundation, the pile head and pile surface should be roughened, the hole should be cleaned, and the cement slurry should be applied. The early strength micro-expansion concrete should be poured and compacted tightly. 2.2.2.8 When sealing the hole, the concrete test block should be reserved. When the strength grade of the test block reaches the requirements of the survey and design, the load can be unloaded.
2.3 Foundation expansion
2.3.1 When the foundation pit is expanded, the excavation range should be determined according to the ash line of the survey and design. 2.3.2 When the groundwater level is higher than the bottom surface of the original foundation pit, drainage treatment should be done first to keep the foundation pit free of water and ground drainage should be done to prevent the foundation pit from being soaked. 2.3.3 The depth of the widened foundation pit shall not exceed the bottom surface of the original house foundation, and the main material of the bottom of the pit shall not be loosened or disturbed.
2.3.4 The old foundation is buried deep. When widening the foundation trench, the slope should be set according to regulations to prevent landslides. If the site is small or the foundation of the adjacent building is shallow, retaining piles or sheet piles should be driven in before the foundation trench can be excavated.
2.3.5 The top and side surfaces of the old foundation and the connection with the new foundation must be roughened, cleaned, and then the interface agent is applied to ensure that the new and old foundations are firmly combined. 2.3.6 The construction of the expanded foundation by adding pilasters to the brick wall shall comply with the following regulations: Engineering Construction Standard Full Text Information System
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2.3.6.1 The cushion layer of the expanded foundation should be flush with the bottom surface of the cushion layer of the old foundation. 2.3.6.2 When adding concrete pilasters to the brick wall, the contact surface between the new and old foundations should be roughened, cleaned, and steel bars should be placed to ensure a firm connection. 2.3.6.3 When adding brick pilasters to brick walls, they should be tied to the old brick foundation grooves in layers with whole bricks.
2.3.7 When using concrete structures to expand brick strip foundations, the following provisions should be met: 2.3.7.1 The cushion layer at the bottom of the foundation should be carried out in accordance with Section 2.3.6.1 of this Code. 2.3.7.2 Draw lines on the foundation masonry according to the survey and design, determine the position of the interlaced connecting steel bars, and make marks.
2.3.7.3 Drill holes according to the marks and clean the floating dust in the holes. 2.3.7.4 Use cement mortar to fix the steel bars in place and fill them securely. 2.3.7.5
The foundation steel bars and connecting bars should be tied firmly, and the formwork should be supported. After passing the inspection, the concrete can be poured.
2.3.8 The reinforcement of strip foundation with through-wall beams shall comply with the following provisions: 2.3.8.1 The cushion layer of the reinforced foundation shall be level with the bottom of the cushion layer of the original strip foundation. 2.3.8.2 The position and size of the through-beam opening shall be marked with positioning lines on the foundation wall according to the requirements of the survey and design, and shall be chiseled out after verification. 2.3.8.3 The cantilever beam and strip foundation shall be tied with steel bars and supported with formwork, and concrete shall be poured only after passing the inspection. The concrete main and foundation wall openings shall be vibrated and filled tightly to ensure a firm connection.
The backfilling of the foundation trench and the restoration of the floor shall be carried out after the concrete reaches the design strength grade.
2.3.9 The expansion and reinforcement of reinforced concrete independent column foundation shall comply with the following provisions: 2.3.9.1 According to the requirements of the survey and design, remove part of the concrete protective layer on the top and sides of the original independent column and foundation to expose the main reinforcement and foundation reinforcement in the process, and remove the floating dust.
First make the cushion layer, and the steel bars should be tied or welded firmly with the original steel bars: the formwork support size is accurate, stable and reliable.
2.3.9.3 Before pouring concrete, the old concrete should be watered and moistened, and the cement slurry or engineering construction standard full text information system
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interface agent should be applied, and the concrete should be poured, vibrated and compacted to make it firmly combined. After the concrete is poured, the maintenance should be strengthened. After reaching the design strength grade, the soil can be backfilled.
House deviation
2.4.1 The construction plan for the house deviation correction project should be prepared, and multiple plans should be compared and selected to achieve technical and economic rationality, safety and reliability.
2.4.2 The deviation correction project should set up observation points, not less than 6, and the number of observations per day should not be less than 3 times, and there should be complete records that meet the accuracy. 2.4.3 Before the rectification construction, the preparation of machinery, materials and personnel must be checked; obstacles to reset must be cleared.
2.4.4 During the rectification construction, the integrity of the upper structure should be ensured. If any abnormality is found in the house, the construction must be suspended and appropriate technical measures must be taken. 2.4.5 The rectification construction by digging the earth should comply with the following regulations: 2.4.5.1
1 Organize and arrange the precipitation well points, equipment and on-duty personnel. 2.4.5.2
The working trench should not be waterlogged.
1000mm.
The hole should not be larger than 300mm×400mm, and the hole spacing should not be larger than 2.4.5.4
Before excavation, the tilt of the house should be observed and recorded. 2.4.5.5
The excavation should be carried out in stages. The first excavation depth should be about 1000mm, and the subsequent depth should be determined by the settlement rate. Measurement should be made as the excavation progresses. 2.4.5.6
The excavation holes should be numbered in odd and even groups, and should be carried out in sections, intervals, symmetry, and synchronously.
The settlement of the excavation construction should be controlled within 5~10mm every day to ensure safety. When the settlement reaches the specified value of the survey design and passes the acceptance, the holes should be filled with stone 2.4.5.8
slag or medium-coarse sand to make them dense. 2.4.5.9
The working trench should be backfilled and compacted in layers.
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