GB 50209-1995 Specification for construction and acceptance of building ground engineering GB50209-95
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National Standard of the People's Republic of China
Code for construction and acceptance of building ground engineering
Code for construction and acceptance of building ground engineeringGB50209—95
Editor: Jiangsu Provincial Construction Committee
Approval Department: Ministry of Construction of the People's Republic of China Effective Date: July 1, 1996
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Notice on the Release of National Standard "Construction and Acceptance Code of Building Ground Engineering"
Jianbiao [1995] No. 777
According to the requirements of the State Planning Commission's Document [1991] No. 290, the "Code for Construction and Acceptance of Building Ground Engineering" revised jointly by the Jiangsu Provincial Construction Committee and relevant departments has been reviewed by relevant departments. The "Construction and Acceptance Specification for Building Ground Engineering" GB50209-95 is now approved as a mandatory national standard, which will be implemented from July 1, 1996. The original national standard "Construction and Acceptance Specification for Ground and Floor Engineering" GBJ20983 will be abolished at the same time.
This specification is managed by the Jiangsu Provincial Construction Committee, and its specific interpretation and other work are the responsibility of the Jiangsu Provincial Construction Engineering Bureau. The publication and distribution is organized by the Standard and Quota Research Institute of the Ministry of Construction.
Ministry of Construction of the People's Republic of China
March 25, 1995
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Basic Provisions·
Pitch cushion:
Sand cushion and gravel cushion
Crushed stone cushion and broken brick cushion·
Merge cushion
China Electric Power Telephone
Slag cushion·
Cement concrete cushion
Isolation layer and filling layer
-General Provisions
Cement concrete surface layer
Cement mortar surface layer
Terrazzo surface layer| |tt||Oil-proof surface layer
Cement steel (iron) chip surface layer
Non-fireable (explosion-proof) surface layer
Asphalt mortar and asphalt concrete surface layer
Marble and granite surface layer·
Precast panel surface layer
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7.12 Stone surface layer…
7.13 Plastic floor surface layer
Raised floor surface layer…
Wooden board surface layer
7.16 Parquet wooden board surface layer
Hard Fiberboard surface layer
7.18 Surface coating
Setting of expansion joints and edging…
Project acceptance
Appendix A
Appendix B
Appendix C
Appendix D
Technical properties of cement mortar and cement concrete (with JJ91 silica densifier)
Softening point of asphalt and temperature during boiling and laying of asphalt mastic
Preparation of anti-oil seepage materials
Test method for non-flammability of non-sparking (explosion-proof) building floor materials and their products
Technical indicators of asphalt mortar and asphalt concrete Appendix E
Appendix F
Appendix G
Appendix H
Quality requirements for plate materials
Purpose and mix ratio of putty and emulsion
Explanation of terms used in this specification
Additional explanation
Appendix: Explanation of clauses
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1 General Principles
This specification is formulated to improve the construction technology of building ground engineering, to achieve advanced technology, economic rationality, quality assurance, safety and applicability while meeting design requirements and functional conditions.
1.0.2 This specification applies to the construction and acceptance of industrial and civil building ground engineering. This specification does not apply to the construction and acceptance of building ground engineering with special requirements such as thermal insulation, heat insulation, ultra-clean, shielding, insulation and protection from radiation. 1.0.3 In addition to complying with this code, the construction and acceptance of building ground projects shall also comply with the provisions of the relevant national standards and specifications in force. Engineering Construction Standard Full-text Information System
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2 Basic Provisions
2.0.1 The building ground should include the ground floor and floor of the building, and include outdoor scattered water, open ditches, steps, steps, ramps, etc. 2.0.2 The building ground should be composed of the following structural layers: 2.0.2.1 Surface layer: the surface layer that directly bears various physical and chemical effects; 2.0.2.2 Bonding layer: the middle layer connecting the surface layer and the next structural layer, which can also serve as the elastic base layer of the surface layer;
2.0.2.3 Leveling layer: a structural layer that plays a leveling, slope or reinforcement role on the cushion layer, floor slab or filling layer (lightweight, loose material); 2.0.2.4 Isolation layer: prevent various The structural layer that prevents the penetration of liquid (including oil) or groundwater and moisture from penetrating the ground can be called a moisture-proof layer only when it prevents underground moisture from penetrating the ground.
2.0.2.5 Filling layer: a structural layer that plays the role of sound insulation, heat preservation, slope adjustment or laying concealed pipelines on the building ground;
2.0.2.6 Pad layer: a structural layer that bears and transfers ground loads to the base soil; 2.0.2.7 Base soil: the soil layer under the ground pad layer (including foundation reinforcement or soft soil foundation surface reinforcement treatment).
2.0.3 The materials used in each structural layer of the building ground, the variety, specification, mix ratio, grade or strength grade of the building products, etc., shall be selected according to the design requirements and the provisions of this code, and shall comply with the provisions of the current relevant product standards. The quality of the incoming materials shall be sampled and re-tested, and they can only be used after being confirmed to be qualified.
The mix ratio or strength grade of the mixed materials used in each layer shall be determined by test. 2.0.4 The thickness of each floor layer and the structure of the connecting parts (for jointing, edging, etc.) shall comply with the design requirements and the provisions of this Code. 2.0.5 The grooves, concealed pipes, etc. located in the lower part of the floor engineering of the building shall be constructed after the completion of the project, passing the inspection and making the hidden engineering records before the upper engineering can be carried out.
2.0.6 The laying of each floor engineering of the building shall be carried out after the next layer meets the relevant provisions of this Code.
2.0.7 During the construction of building ground engineering, the ambient temperature of each layer and the temperature of the laid materials shall comply with the following provisions:
2.0.7.1 When using cement-mixed materials to lay the surface layer, bonding layer, leveling layer and cushion layer, the ambient temperature shall not be less than 5°C; 2.0.7.2 When using lime-mixed materials to lay the cushion layer, the ambient temperature shall not be less than 5°C;
2.0.7.3 When using asphalt binder (unless otherwise specified, petroleum asphalt binder, the same below) as the bonding layer and filler to lay blocks and wooden boards When laying blocks and stone surface on the sand and gravel cushion layer and the sand bonding layer, the ambient temperature should not be less than 0℃, 2.0.7.6 When laying crushed stone and broken brick cushion layer, the ambient temperature should not be less than 0℃; 2.0.7.7 When the construction temperature is lower than the above temperature, the corresponding winter measures should be taken. 2.0.8 The preparation, maintenance and strength test of cement concrete and cement mortar test blocks shall comply with the provisions of the current national standards "Concrete Structure Engineering Construction and Acceptance Code" and "Masonry Engineering Construction and Acceptance Code". The number of test blocks should not be less than one group for each floor of the building ground project. When the floor area of each floor exceeds 1000m2, one group of test blocks shall be added for every additional 1000m2. If it is less than 1000m2, it shall be calculated as 1000m2. When the mix ratio is changed, the number of test blocks shall be made accordingly.
2.0.9 When laying a sloped ground on the compacted base soil, the base soil height difference shall be adjusted to achieve the slope required by the design.
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When laying a ground or floor with a slope on a reinforced concrete slab, the slope should be set according to the structure or the filling layer (or leveling layer) should be used to reach the slope required by the design. 2. 0.10
After the completion of the building ground engineering, protective measures should be taken for the surface layer. Engineering Construction Standard Full Text Information System
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3 Base Soil
3.0.1 The ground should be laid on a uniform and dense base soil. The base soil with fill or soil layer structure disturbed should be compacted (rammed) in layers. 3.0.2 When constructing on soft soil layers such as silt, silty soil, miscellaneous fill, and flush fill, the base soil should be replaced or reinforced according to the design requirements; and it should comply with the relevant provisions of the current national "Code for Construction and Acceptance of Foundation and Foundation Engineering" and "Technical Code for Building Foundation Treatment".
The quality of the backfill shall comply with the relevant provisions of the current national standard "Specifications for Construction and Acceptance of Earthwork and Blasting Engineering". Silt, humus, frozen soil, cultivated soil and soil with an organic matter content of more than 8% shall not be used as backfill. When expanding soil is used as backfill, it shall be technically treated.
3.0.3 The backfill construction shall be compacted () in layers by mechanical or manual methods, and the particle size of the soil block shall not be greater than 50mm. The thickness of each layer of virtual paving: when compacted mechanically, it should not be greater than 300mm; when compacted with a frog-type rammer, it should not be greater than 250mm; when compacted manually, it should not be greater than 200mm. The compaction coefficient of each layer of soil after compaction (tamping) shall meet the design requirements, but shall not be less than 0.9. Before backfilling, it is advisable to take soil samples and use compaction tests to determine the optimal moisture content and the corresponding maximum dry density.
3.0.4 The backfill should be constructed under the condition of optimal moisture content; over-dry soil should be moistened before compaction, and over-wet soil should be dried. When backfilling industrial plants, the optimal moisture content and the control range of construction moisture content should be determined by tests before construction.
3.0.5 When backfilling at the foundation of walls and columns, it should be overlapped and compacted. At the connection between the backfill and the wall and column, technical treatment can also be adopted by setting seams. 3.0.6 When the soil layer under the base soil is non-collapsed, the backfill can be compacted (rammed) as it is watered when it is sandy. The thickness of each virtual paving layer should not be greater than 200mm. Engineering Construction Standard Full-text Information System
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3.0.7 When crushed stone, pebbles, etc. are used to strengthen the surface of the base soil, they should be evenly laid into one layer. The particle size should be 40mm, and it should be pressed (rammed) into the moist soil layer. 3 When laying the ground on frost-heaving soil, anti-frost heaving treatment should be done according to the design requirements before construction. Filling construction on frozen soil is not allowed. Engineering Department Standard Full Text Information System
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4 Cushion
4.1 Lime Soil Cushion
4.1.1 The lime soil cushion should be laid with a mixture of slaked lime and clay (or silty clay, silt), and its thickness should not be less than 100mm. And it should be laid on a base that is not soaked by groundwater.
The volume ratio of the lime soil mixture should be 3:7 (slaked lime: clay), or the ingredients should be prepared according to the design requirements.
When fly ash or calcium carbide slag is used instead of slaked lime as a cushion layer, its particle size shall not be greater than 5mm, and the volume ratio of the mixture shall be determined through experiments. 4.1.2 Slaked lime shall be powdered with water 3 to 4 days before the use of quicklime (the lump ash in the lime shall not be less than 70%), and sieved. Its particle size shall not be greater than 5mm. Slaked lime can also be ground into quicklime and mixed with clay according to the volume ratio and stacked for 8 hours before use.
The clay used shall not contain organic impurities and shall be sieved before use. Its particle size shall not be greater than 15mm.
4.1.3 The lime-soil mixture shall be mixed evenly, with uniform color and a certain humidity. The amount of water added should be 16% of the total weight of the mixture.
4.1.4 The lime-soil mixture shall be laid in layers and compacted as it is laid. It shall not be compacted every other day and shall not be exposed to rain. The thickness of each layer of virtual paving should be 150-250mm. The minimum value of the compacted dry density should meet the design requirements. The surface after compaction should be flat, and the next process can be carried out after drying. Www.bzxZ.net
Before continuing to lay after a construction break, the joints should be cleaned and the joints should be overlapped and compacted after laying.
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4.2 Sand cushion layer and gravel cushion layer
4.2.1 The thickness of the sand cushion layer shall not be less than 60mm; the thickness of the gravel cushion layer shall not be less than 100mm.
Sand or gravel shall not contain organic impurities such as grass roots, and shall not contain frozen blocks during winter construction: the maximum particle size of gravel shall not be greater than 2/3 of the thickness of the cushion layer. 4.2.2 Sand should be medium sand or medium coarse sand with a hard texture. After the sand cushion is leveled, it should be sprinkled with water to moisten it, and it is advisable to use a machine to vibrate it. The density after vibration should meet the design requirements. The inspection method can be to use the ring force method to determine its dry density value, or to use a small hammer penetration test.
When the base is a non-collapsible soil layer, the construction of the sand cushion should comply with the provisions of Article 3.0.6 of this Code.
4.2.3 Sand and gravel should be selected from materials with good grading. The sand and gravel cushion should be spread evenly, and there should be no separation of coarse and fine particles. Before compaction, water should be added to keep the surface of the sand and gravel moist; when using mechanical rolling or manual tamping, it should not be less than three times, and it should be compacted (tamped) until it is not loose.
4.3 Crushed stone cushion and broken brick cushion
4.3.1 The thickness of the crushed stone cushion should not be less than 60mm; the thickness of the broken brick cushion should not be less than 100mm.
Crushed stone should be selected from stones with uniform strength and unweathered, and its maximum particle size shall not be greater than 2/3 of the thickness of the cushion layer.
Broken bricks shall not be weathered, loose, or contain tiles and organic impurities, and their particle size shall not be greater than 60mm.
4.3.2 The crushed stone cushion layer shall be spread evenly, and the surface gaps shall be filled with fine gravel with a particle size of 5 to 25mm. Its construction shall comply with the provisions of Article 4.2.3 of this Code. 4.3.3 The crushed brick cushion layer shall be spread evenly in layers, and after being sprinkled with water to moisten it, it shall be compacted with machinery to achieve a smooth surface. The thickness after compaction shall not be greater than 3/4 of the virtual paving thickness.
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W.bzsoso.con1 Lime-soil cushion layer
4.1.1 The lime-soil cushion layer should be paved with a mixture of slaked lime and clay (or powdery clay, powdered soil), and its thickness should not be less than 100mm. It should be laid on a base that is not soaked by groundwater.
The volume ratio of the lime-soil mixture should be 3:7 (slaked lime: clay), or the ingredients should be mixed according to the design requirements.
When fly ash or calcium carbide slag is used instead of slaked lime as a cushion layer, its particle size shall not be greater than 5mm, and the volume ratio of the mixture shall be determined through experiments. 4.1.2 Slaked lime should be sprinkled with water and powdered 3 to 4 days before the use of quicklime (the lump ash in the lime should not be less than 70%), and sieved. Its particle size shall not be greater than 5mm. Slaked lime can also be ground quicklime, which should be mixed with clay according to the volume ratio and stacked for 8 minutes before use.
The clay used shall not contain organic impurities and shall be sieved before use. Its particle size shall not be greater than 15mm.
4.1.3 The lime-soil mixture shall be mixed evenly, have uniform color, and maintain a certain humidity. The amount of water added should be 16% of the total weight of the mixture.
4.1.4 The lime-soil mixture shall be laid layer by layer and compacted as it is laid. It shall not be compacted every other day and shall not be exposed to rain. The thickness of each layer shall be 150-250mm. The minimum value of compacted dry density shall meet the design requirements. The surface after compaction shall be flat and the next process can be carried out after drying.
Before continuing to lay after a construction break, the joints shall be cleaned and the joints shall be overlapped and compacted after laying.
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4.2 Sand cushion and gravel cushion
4.2.1 The thickness of the sand cushion shall not be less than 60mm; the thickness of the gravel cushion shall not be less than 100mm.
Sand or gravel shall not contain organic impurities such as grass roots, and shall not contain frozen blocks during winter construction: the maximum particle size of gravel shall not be greater than 2/3 of the thickness of the cushion. 4.2.2 Sand should be medium sand or medium coarse sand with hard texture. After the sand cushion is leveled, it should be sprinkled with water to moisten it, and it should be vibrated by machines. The density after vibration should meet the design requirements. The inspection method can be to use the ring force method to determine its dry density value, or to use a small hammer penetration test.
When the base is a non-collapsed soil layer, the construction of the sand cushion should comply with the provisions of Article 3.0.6 of this Code.
4.2.3 Sand and gravel should be made of materials with good gradation. The sand and gravel cushion layer should be spread evenly without separation of coarse and fine particles. Before compaction, water should be added to keep the surface of the sand and gravel moist; when using mechanical rolling or manual tamping, it should not be less than three times, and the tamping should not be less than three times, and it should be pressed (tamped) until it is not loose.
4.3 Crushed stone cushion layer and broken brick cushion layer
4.3.1 The thickness of the crushed stone cushion layer should not be less than 60mm; the thickness of the broken brick cushion layer should not be less than 100mm.
Crushed stone should be made of uniform strength and unweathered stone, and its maximum particle size should not be greater than 2/3 of the cushion layer thickness.
Bricks that are weathered, loose, or contain tiles and organic impurities should not be used, and their particle size should not be greater than 60mm.
4.3.2 The crushed stone cushion layer should be spread evenly, and the surface gaps should be filled with fine stones with a particle size of 5 to 25 mm. Its construction should comply with the provisions of Article 4.2.3 of this Code. 4.3.3 The crushed brick cushion layer should be spread evenly in layers, and after being wetted with water, it should be compacted by machines to achieve a flat surface. The compacted thickness should not be greater than 3/4 of the virtual thickness.
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W.bzsoso.con1 Lime-soil cushion layer
4.1.1 The lime-soil cushion layer should be paved with a mixture of slaked lime and clay (or powdery clay, powdered soil), and its thickness should not be less than 100mm. It should be laid on a base that is not soaked by groundwater.
The volume ratio of the lime-soil mixture should be 3:7 (slaked lime: clay), or the ingredients should be mixed according to the design requirements.
When fly ash or calcium carbide slag is used instead of slaked lime as a cushion layer, its particle size shall not be greater than 5mm, and the volume ratio of the mixture shall be determined through experiments. 4.1.2 Slaked lime should be sprinkled with water and powdered 3 to 4 days before the use of quicklime (the lump ash in the lime should not be less than 70%), and sieved. Its particle size shall not be greater than 5mm. Slaked lime can also be ground quicklime, which should be mixed with clay according to the volume ratio and stacked for 8 minutes before use.
The clay used shall not contain organic impurities and shall be sieved before use. Its particle size shall not be greater than 15mm.
4.1.3 The lime-soil mixture shall be mixed evenly, have uniform color, and maintain a certain humidity. The amount of water added should be 16% of the total weight of the mixture.
4.1.4 The lime-soil mixture shall be laid layer by layer and compacted as it is laid. It shall not be compacted every other day and shall not be exposed to rain. The thickness of each layer shall be 150-250mm. The minimum value of compacted dry density shall meet the design requirements. The surface after compaction shall be flat and the next process can be carried out after drying.
Before continuing to lay after a construction break, the joints shall be cleaned and the joints shall be overlapped and compacted after laying.
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Engineering Construction Standard Full Text Information System
4.2 Sand cushion and gravel cushion
4.2.1 The thickness of the sand cushion shall not be less than 60mm; the thickness of the gravel cushion shall not be less than 100mm.
Sand or gravel shall not contain organic impurities such as grass roots, and shall not contain frozen blocks during winter construction: the maximum particle size of gravel shall not be greater than 2/3 of the thickness of the cushion. 4.2.2 Sand should be medium sand or medium coarse sand with hard texture. After the sand cushion is leveled, it should be sprinkled with water to moisten it, and it should be vibrated by machines. The density after vibration should meet the design requirements. The inspection method can be to use the ring force method to determine its dry density value, or to use a small hammer penetration test.
When the base is a non-collapsed soil layer, the construction of the sand cushion should comply with the provisions of Article 3.0.6 of this Code.
4.2.3 Sand and gravel should be made of materials with good gradation. The sand and gravel cushion layer should be spread evenly without separation of coarse and fine particles. Before compaction, water should be added to keep the surface of the sand and gravel moist; when using mechanical rolling or manual tamping, it should not be less than three times, and the tamping should not be less than three times, and it should be pressed (tamped) until it is not loose.
4.3 Crushed stone cushion layer and broken brick cushion layer
4.3.1 The thickness of the crushed stone cushion layer should not be less than 60mm; the thickness of the broken brick cushion layer should not be less than 100mm.
Crushed stone should be made of uniform strength and unweathered stone, and its maximum particle size should not be greater than 2/3 of the cushion layer thickness.
Bricks that are weathered, loose, or contain tiles and organic impurities should not be used, and their particle size should not be greater than 60mm.
4.3.2 The crushed stone cushion layer should be spread evenly, and the surface gaps should be filled with fine stones with a particle size of 5 to 25 mm. Its construction should comply with the provisions of Article 4.2.3 of this Code. 4.3.3 The crushed brick cushion layer should be spread evenly in layers, and after being wetted with water, it should be compacted by machines to achieve a flat surface. The compacted thickness should not be greater than 3/4 of the virtual thickness.
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