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    10 new technologies of building industry: steel structure residential application technology

    10 new technologies of building industry: steel structure residential application technology

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    In order to improve the technical level of the construction industry, the Ministry of housing and Urban Construction announced the notice on the promotion and application of the "10 new technologies (2017 Edition) of the construction industry". The following is the specific content of the "10 new technologies (2017 Edition) of the construction industry". As a first-class constructor and the road to the first level builder, you must know that:

    Application technology of steel structure housing

    5.10.1 technology content

    The design of steel structure residential buildings should aim at integrated residential buildings. The standardization of components and fittings and the stereotype of equipment should be realized according to the principle of modular coordination. With steel structure as the main bearing structure system of housing, the cold bending thin-walled steel structure system should be adopted as the main structure for low density housing. The wall is a wall column and plasterboard, the floor is C type grille plus light plate, and the steel frame, frame support (wall plate), tube structure and steel frame can be selected for the multi and high rise residential structure system. The steel mix combination system, the floor structure should adopt the steel truss floor slab, the cast in place reinforced concrete structure and the assembly integral floor, the wall is the prefabricated light slab or the light mass block. At present, the main direction of the development of steel structure residences is a light steel structure that can be applied to multi-storey steel plate shear walls or mixed with ordinary steel. It can be applied to low and multi-layered steel frame systems based on rectangular concrete-filled special-shaped columns and outer ribs, which can be applied to the combination of steel frame and concrete cylinder in high level. A composite structure or a frame structure supported by steel, as well as a frame - support, frame core tube system and a steel tube bundle shear wall structure system based on square steel tube concrete composite special-shaped column and outer ribbed ring plate node.

    The steel structure of light steel structure housing should be hot rolled H steel, high frequency welding or ordinary welded H steel, cold rolled or hot rolled steel tube, steel shaped column and so on. The column material of high-rise steel structure residential structure can be used as pure steel column or concrete filled steel tube column, and the column section shape can be used in rectangle, circular, L shape, etc. For the sand filling plate, the grouting wall panel or the autoclaved aerated concrete block, the inner wall can be selected as the light steel keel plasterboard, and the floor can be the steel truss floor, the laminated board or the cast-in-place board.

    In addition to the common assembly steel structure residential structural system, modular steel structure construction began to develop. Modular architecture is a new type of building, which is divided into a single room or a certain three-dimensional building space, each unit is prefabricated and refined in a factory, and the unit is transported to the whole site of the construction site. According to the different structural forms, it can be divided into the whole module architecture system and the complex modular building structure system, and the composite module architecture system can be divided into: the modular unit and the traditional frame structure compound system, the modular unit and the plate structure compound system, the outer framework (giant frame) module architecture structure system and the model. Block unit and shear wall or core tube composite structure system; the outer wall panel of the module can choose aerated concrete plate, thin plate and steel bone composite light wall, light aggregate concrete and rock wool board composite wall panel, and the floor of the module can be reinforced concrete floor, light structure floor, and the roof can be a double-sided plate sandwich plate.

    The construction of steel structure residence should take the industrialization as the goal and do the supporting work of the wallboard.

    5.10.2 technical indicators

    The structural design of steel structure housing should conform to the industrial production requirements of factory production and field assembly. The design of components and nodes should be standardized, universal and serialized. In the structure design, the assembly rate of the building structure should be reasonably determined.

    The properties of steel should be in accordance with the provisions of the current national standard "code for design of steel structure" GB50017 and GB50009 of "code for seismic design of buildings", and high performance steel should be preferred.

    The steel structure housing should be designed in accordance with the current national standard "the technical standard of the assembled steel structure" GB/T 51232. The seismic fortification category is determined according to the current national standard "the classification standard for seismic fortification of Architectural Engineering" GB50223, and the seismic design should be carried out according to the current national standard "code for seismic design of buildings" (GB50011). Plan. For buildings with a height greater than 80m, the comfort of wind loads should be checked.

    The fire protection grade of steel structure housing should be determined according to the current national standard "code for building design fire protection" GB 50016. The fireproof material should be selected first. The thickness of the plate should be determined according to the fire resistance time limit and the fire board product standard, and the refractory time limit of the bearing steel should meet the relevant requirements.

    Scope of application of 5.10.3

    The cold-formed thin-walled steel structure and light-weight steel frame light steel structure can be applied to the construction of low and multi-storey (6 storey, 24m below) houses. The maximum applicable height of the multi and high and high level assembled steel structure housing system should be in accordance with the provisions of GB/T 51232 of "the technical standard of the assembled steel structure building". The main reference values are as follows:

    Table 5.1 maximum height (m) for multi-storey high-rise fabricated steel structures

    For the steel structure module building, the 1~3 layer module construction should adopt the full module structure system, the module unit can use the container module, the connection node can choose the container corner connection, the 3~6 layer can adopt the full module structure system, the unit connection can adopt the beam and beam connection technology, and the 6~9 layer module building unit can adopt the pre stress. Force module connection technology, 9 or more layers of modular units need to be combined with shear walls or core tubes.

    The construction of steel structure residence should take the industrialization as the goal and do the supporting work of the wallboard. Based on the pilot project, we should do a good job in the promotion of the steel structure residence.