Ministry of Construction document "Technical Guidelines for Industrialization of Steel Structure Residential Buildings"

1 Zongbei 1J (1) In order to standardize and promote the development of steel structure residential buildings in China, explore the development path of steel structure residential industrialization suitable for China's national conditions, and summarize the practice of steel structure residential projects in China in accordance with the basic requirements of improving the building system and improving the overall function Based on experience, this "Guideline" was formulated in accordance with national industrial policies.

Design, construction and development of residential buildings. The steel structure houses with more than 12 floors can be implemented by reference.

(3) This "Guideline" aims to take the opportunity of the development of steel structure residential buildings to promote the formation of a steel structure residential building system that conforms to the housing industry policy, the direction of housing commercialization, and has a reasonable price-performance ratio and relatively complete functions. The industrialization level of residential construction meets the diversified market demand.

(4) Steel structure residential construction involves construction, metallurgy, building materials and related industries, and is a systematic project. The development of the steel structure residential building system will promote the improvement of the quality of building steel and other building materials and equipment in China, as well as the renewal of varieties, and further improve the level of housing industrialization in China.

(5) The steel structure residential building has the characteristics of light weight, good seismic performance, short construction period, high degree of industrialization, and good environmental protection effects, which meets the requirements of the sustainable development of China's national economy.

(6) The state encourages scientific and technological research on steel structure residential buildings.

In the development and construction, new materials, new processes and new technologies must be verified by the construction administrative department above the provincial level before they can be used.

(7) The research and development, design, production, construction and installation of steel structure residential buildings should follow the relevant national policies and standards.

2 Architectural system 21 Design principles Steel-structured residential buildings are the final product of industrial integration. In addition to meeting the behavioral needs of living and living in different regions, coordination, coordination and coordination should also be followed in the design, production, transportation, installation, maintenance and management links. The principle of interaction.

(1) The design of steel structure residential buildings should fully reflect the principles of standardization, stereotypes, diversification and generalization.

(2) The design of steel structure residential buildings, parts, and spare parts should implement the principle of modular coordination.

(3) The design of steel structure residential buildings should comply with the principles of comprehensive design of architecture, structure, water, heating, electricity and gas.

22 Plane layout () Plane layout must embody the principle of serialization, and fully adapt to the characteristics of standardized design of steel structural members, factory production, general application, and diverse combinations.

(2) The layout of the column grid should meet the requirements of regulation, and it is advisable to realize modularization in units of residential units or sets, and adapt to the changes in the overall layout by adapting multiple splicings such as flat connection, wrong connection and symmetric concave (convex) connection of the modules. .

(3) For the design of units or sets of modules, comprehensive consideration should be given to the optimal selection of columns, beams, floor slabs, exterior wall slabs, roof slabs and partition wall slabs, equipment, and pipelines to suit the individualized, diversified, and modifiable residence need.

When the module adopts small column net, it should be combined with floor and pipeline design. When the module adopts a large-column net, the facility pipeline should be designed as a fixed-position tube bundle. The strong and weak current lines can be arranged along the cavity of the partition wall, the kick leg, the waist line, the mirror line and the top pressure line.

(4) The kitchen and toilet should be located close to the concrete core tube or concrete shear wall, avoiding the steel structure load-bearing members, so as to facilitate the fire protection and anti-corrosion treatment of the steel structure members.

(5) The kitchen and bathroom should adopt an integrated design, and the kitchen and toilet equipment should conform to the principle of modular coordination. Implement factory prefabrication, on-site assembly and create conditions for one-time decoration.

23 Vertical design (1) The selection of the floor slab structure should take into account and meet the requirements of stress, sound insulation and piping, wiring, etc. The vertical design should consider the indoor net height requirements and determine the floor height reasonably.

(2) It is advisable to use the space between the floor slab and the suspended ceiling to lay horizontal pipelines to facilitate pipeline maintenance, management and renewal.

24 Enclosure structure (1) The enclosure structure shall have reliable connection and seismic ductility with the steel structure, and shall prevent "thermal bridges".

(2) The wall should be made of high-strength, light-weight plates with good thermal insulation, thermal insulation, sound insulation, waterproof, fire prevention, crack resistance and weather resistance, etc., and supporting materials should also be provided , Connect accessories and construction machinery, etc., to facilitate construction and ensure quality. The exterior of the wall should be made of materials with waterproof, crack resistance, weather resistance and stain resistance.

(3) The roof should choose high-strength, light-weight roof with good thermal insulation, heat insulation, sound insulation, waterproof, fire prevention and crack resistance.

25 Partition wall (1) The partition wall shall have a reliable connection with the steel structure and have seismic ductility.

(2) The partition wall should adopt the assembled wall of safety, fire prevention and sound insulation.

(3) The partition walls should be easy-to-remove partition parts, which should be able to adapt to the arrangement and arrangement of facility pipelines.

3 Structural system 3.1 Structural selection and layout (1) The structural system should be selected in accordance with the principles of safety, reliability, economic rationality and convenient construction, combined with the requirements of building functions, building modules and building enclosures. Can be selected according to the following scope: â‘  Below 3 layers: frame system, light steel keel (cold-formed thin-walled steel) system; 6 layers: frame-support system, steel frame-concrete core (shear wall) system; ~ 12 layers: Steel frame-concrete core tube (shear wall) system, steel-concrete composite structure system.

(2) The inter-layer displacement of the structural system shall comply with the relevant specifications.

(3) The core tube of the steel frame-concrete core tube system should be equipped with small steel columns, steel skeleton columns or steel reinforced concrete structures according to the seismic fortification intensity, to increase ductility, improve seismic performance, and facilitate construction.

(4) Steel frame-concrete core tube (shear wall) system should avoid the mixed structure of steel frame and single concrete shear wall.

(5) The steel frame beam and core tube should be hingedly connected.

(6) Reinforced concrete beams should be avoided for combined structural frames.

3.2 Floor structure (1) According to the requirements of bearing capacity, stiffness, seismic fortification and building function, the floor structure can be selected from steel plate composite floor, cast-in-place concrete composite floor, concrete laminated composite floor and precast concrete slab.

(2) Combined floor slabs should be connected to steel beams using shear connectors according to relevant standards. The laminated plates and prefabricated plates should be welded with embedded parts and steel beams. The seam should be buried with seismic structures; the cast-in-place layer of concrete laminated plates should not be less than 5cm, and the interface should be reliably combined; all floors should be combined with shear The wall or core tube has a reliable force transmission connection.

3.3 Steel is selected from structural steel or national standard GB / T1591 Q345 high-strength low-alloy structural steel, and grade B steel should be selected.

(2) The cross-section of the component should be selected from hot-rolled H-shaped steel, high-frequency welded H-shaped steel, cold-formed steel (C-shaped steel, Z-shaped steel, square steel tube and other cross-sectional forms) and concrete-filled steel tube.

3.4 Node design (1) The form and structure of the node should follow the principles of standardization and generalization.

(2) For the connection between the beam and the column of the frame structure, flange welding webs should be used and connected with high-strength bolts, or the beam can be spliced ​​on site through the cantilever section of the beam.

(3) The connection of components with seismic fortification requirements, in addition to the elastic design according to the most unfavorable load combination effect according to the "Steel Structure Design Code", should also be carried out according to the "Code for Seismic Design of Buildings" or "Technical Specification for Steel Structures of High-rise Civil Buildings" Calculation of ultimate bearing capacity.

4 Construction equipment (1) The design and selection of construction equipment should meet the requirements of relevant standards and specifications. Various designs and components should be factory-produced and assembled on site.

(2) Vertical pipelines should be arranged centrally and set in dedicated pipeline wells or pipeline walls, or installed on site by prefabricated pipe bundles.

(3) It is advisable to reserve wiring laying space to meet the requirements of setting horizontal pipelines.

(4) Drainage of sanitary ware should be solved at this level, and strict waterproof measures should be taken.

(5) The design, construction and installation of pipelines and equipment shall fully consider the characteristics of steel structure residential buildings.

(6) The central heating system should use a double-pipe system, implement temperature regulation and household heat metering devices, and implement heating metering charges.

(7) The comprehensive layout of strong and weak current lines should be combined with the partition structure.

(8) Use the equipotential characteristics of the steel structure to make the natural ground connection.

(9) Exhaust devices should be considered when prefabricating kitchens and bathrooms.

5 Steel structure protection (1) The fire protection of the steel structure should be based on the design requirements by spraying fireproof paint or other effective outer cover fireproofing measures. * Continue to page 9 * The elongation rate meets the design requirements, and its application prospect is considerable.

In order to cooperate with the production of large-span hollow slabs and effectively reduce costs, the Northeast Architectural Standards Office has developed some general atlases for spiral ribbed steel plates for some manufacturers, which shows that it has achieved good results. Recently, Shenyang Peixin Prestressed Steel Co., Ltd. cooperated with other relevant members to replace the original steel bars with spiral rib bars. Recently, it was first tried in traditional large roofing panels (1.5X6.0m). Good, the price is not expensive, it is expected that there will be more satisfactory results.

As for cold-rolled ribbed steel bars, as long as the technological innovation is implemented, the prospects are still optimistic. Although the country has explicitly promoted new-grade steel, some parts of cold-rolled ribbed steel bars still have advantages, such as the secondary pouring layer on the top of the prestressed laminated plate The steel bar should be cold-rolled ribbed bar welded mesh, and the mesh size and structure will be clearly marked on the future atlas. Cold-rolled ribbed steel bar welded mesh is widely used in Germany, the United States, Italy, Austria and other countries. In 1994, the annual output of the European Community reached 4.5 million tons, and the annual consumption of an island country in Singapore reached more than 150,000 tons. The amount is very small, and we should increase the efforts to promote welding mesh. Because the tensile design strength of this kind of steel is increased from 210MPa to 360MPa of class I steel bars. According to the principle of strength replacement such as steel bars, cold-rolled ribbed steel bars are used to replace class I steel bars. In theory, steel can be saved by 42%. If the minimum reinforcement ratio is considered The requirement can also reach about 30%, and its social and economic benefits are considerable. At the same time, the mesh is a welded mesh, which reduces a series of cumbersome procedures such as manual auxiliary equipment and lashing. The welded mesh is produced in the factory and can be hoisted and laid after being shipped to the construction site, which is convenient and fast, and accelerates the construction progress. The traditional lashing nets are placed manually, and the spacing error of the steel bars is large, the binding is not strong, and the vertical and horizontal steel bars have no reliable and reliable force transmission connection. Under stress, they are only borne by a single steel bar, which is easy to be deformed by trampling during construction, thereby reducing Component bearing capacity. The welded mesh can be composed by welding * Continued from page 4 * (2) When using concrete-filled steel tube members, the fire resistance and weather resistance of the steel structure should be designed for the fire resistance of the steel structure and meet the requirements of the relevant national fire codes.

(3) The anti-corrosion design should be done according to the environment and use requirements. Comprehensive consideration should be given to the types of base materials of steel members, surface rust removal level, coating structure, coating thickness, coating process, usage status and expected corrosion resistance life, etc., a reasonable rust removal method and coating method should be proposed, and the rust removal The grade should be (sa21 / 2), and the components of the light steel keel (cold-formed thin-walled steel) system should be made of hot-dip galvanized steel plates.

6 Factory production and construction and installation 6.1 Processing and manufacturing (1) Processing and manufacturing of steel components should meet the requirements of relevant standards and specifications.

(2) The materials used for steel structure should be strictly managed, and must be re-inspected before cutting.

(3) High-strength bolts should be used for the on-site connection of the steel structure, and the design and construction should meet the requirements of the relevant codes.

The solid overall mesh sheet transmits force through the solder joints and spreads evenly when stressed, so as to achieve common stress and greatly improve the crack resistance of the component.

However, when promoting this mesh, market management should be strengthened to ensure product quality. I have seen some manufacturers' meshes, and there is indeed a phenomenon that is not optimistic. In addition, the cost of welded wire mesh should be reduced as much as possible. According to the analysis, there is a large profit margin for the production and sales of welded wire mesh.

6 Concluding remarks In summary, technical innovation in the concrete industry is promising, and the road to industrialization is imperative. I hope that the majority of entrepreneurs will base on technological progress, continue to enrich innovative ideas, actively connect with the construction market, and actively respond to WTO accession.

As an important link for science, industry, trade, production, learning, and research, the Concrete Association has an inescapable responsibility for this. Only with "doing" will there be "position", and only with good service will there be cohesion, and it will truly become Business home. This requires the association to give full play to its own technological advantages and favorable conditions, do its best to help enterprises do scientific and technological innovation and industrialization, assist enterprises to do "recruitment" and select some good projects to provide to enterprises, recommend Some high-level experts help enterprises to work together to create a brighter and better tomorrow for the concrete industry.

Engineering major. Part-time: Director of the Architectural Design and Standards Office of Northeast China, deputy director of the National Masonry Structure Committee, deputy chairman of China Aerated Concrete Association, and deputy chairman of Liaoning Concrete Association.

(4) Welding execution of steel structure ("Building Steel Structure Welding Regulations", relevant welding procedure qualification test if necessary).

6.2 Construction and installation (1) The construction unit should prepare construction organization designs for different steel structure residential building systems, combining project characteristics, carefully organize construction, orderly supply materials, and clarify the starting and ending points and delivery conditions of subcontracted projects.

(2) The construction and installation of steel structures shall implement the "Code for Acceptance of Construction Quality of Steel Structure Engineering".

7 Attached Shell 1J (1) The "Guidelines" are interpreted by the Science and Technology Department of the Ministry of Construction.

(2) If these "Guidelines" conflict with the technical regulations issued by the state, they shall be implemented in accordance with the technical regulations.

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