低层轻型钢结构装配式住宅体系发布时间：2015-9-6 8:59:47 浏览次数:748
Cold-formed thin-wall steel structure prefabricated housing system is a kind of light steel structure system, mainly by the walls, floor, roof and maintenance structure, this structure is generally applied to three layers of the following independent or row houses, the plane size for each residential unit: the maximum length of 18 m, width of 12 m; Single bearing wall height is not more than 3.3 m, cornice height is not more than 9 m; Roof pitch values should be within the scope of 1:4 ~ 1 to 1.
Cold-formed thin-walled steel structure of basic building blocks prefabricated housing only U (common channel) and C (edge trough) two sections. U-shaped cross section generally used as the top beam, beam, beam or C shape section generally used as beam-column member, member of the thickness of the metal material generally within the range of 0.46 ~ 2.46 mm, but the top beam, beam, beam and the thickness of the bearing component should not be less than 0.84 mm. The component has a standard, u-shaped cross section only eight kinds of commonly used models, c-shaped cross section only five commonly used models, rarely visible artifacts sort, no matter design or production and installation is very convenient. In addition, the cold-formed thin-wall steel structure of reasonable section shape, high material utilization, steel weight of the steel structure, in Australia, the steel quantity of an order for the system of about 100 kn/m2.
Steel structure component connection fasteners, including screw, common nails, nail, rivets, bolts, fasteners and so on. Common screw mechanical components (using self-drilling screw with tapping screw and tapping screw) connection, self-drilling screw with tapping screw connection for more than 0.84 mm thick steel plate, self tapping screw for gypsum board structure or only 0.84 mm thick steel plate under the connection between the, commonly used self-drilling screw with tapping screw, or self tapping screw only 3 ~ 5 kinds of specifications. Can be used in the structure of the secondary site, nail, rivets and fasteners fasteners, fastener connection is also used to form a composite section. Light steel floor or wall by anchor bolt and masonry or concrete base connection, common nails used for components and wood beam connection.
Floor is composed of dense beam and floor plate, beam, in the end of the beam has a supporting of the floor beam on the wall, there must be sufficient bearing length. When the floor beam span more than 3.5 m, pull take measures should be taken to strengthen the lateral stability of beam. When need to open the hole in the floor, floor beam shall be set up around the mouth of the cave. Floor must be based, wood and concrete beam or main wall and reliable connection. Strength, stiffness, stability of floor and its components as well as the vibration of the floor should be meet the design requirements.
Wall structure is composed of dense column and wall, wall column at both ends of the set of a bottom beam or top beam, wall panel to provide lateral support to the wall, x-shaped shear support system shall be set up when necessary. All main wall Windows and doors hole must be set above the lintel, lintel can use box, form of work or l-shaped cross section, the section size should meet the design requirements. When the seismic fortification intensity of 8 degrees and over or maximum wind pressure is 1.5 kN/m2 (standard) above, such as shear wall should be set up and take the pull-out take measures. Wall body and foundation or floor must be reliable connection, strength, stiffness, stability of wall and its components shall meet the design requirements.
On roof also USES beam system, roof panel, roof is composed of roofing cant beam and roof beams. Roof (beam) and main wall of the top beam, roof panel and roof truss inclined beam, roof and gable roof beam, truss inclined beam and truss beams or roof components must be reliable connection, roof beam in the bearing place must have enough bearing length, in order to keep the roof stability and integrity during installation and use, roof beam and truss inclined beam should be set level, should also be set between the roof beams and oblique beam inclined support. When you need to open hole in the roof or ceiling, edge beam shall be set up around the mouth of the cave. When the seismic fortification intensity of 8 degrees and over or maximum wind pressure is 1.5 kN/m2 (standard) above, through the eaves of the roof fittings and shear wall is reliable. Roof system and its components, the strength, stiffness and stability all should meet the design requirements.
In order to ensure that the steel structure housing has a good live performance, deal with the bottom floors, walls and roofing heat preservation and heat insulation measures, such as in frame light steel structure inside the cavity filling heat preservation cotton, spray liquid foaming material or attached with foam insulation board, etc.; Walls, floor and roof of the residence and appropriate sound-absorbing, sound insulation and noise elimination measures, building palisade structure also measures should be taken to prevent water vapor condensation phenomenon.
For use in bearing structure, adopt or Q390 Q345 steel, when have reliable basis, also can use other brand of steel. Thermal insulation material is made of glass fiber, polyurethane plate, rock wool board, extruded board and other lightweight materials. Can use waterproof coiled material, modified asphalt waterproofing materials, composite materials, etc. Can use directional structure panel board, glued wood (bamboo) board, gypsum board, the material such as cement fiberboard, cement particleboard. Roofing materials can be used for asphalt tiles, metal tile, color cement tile and other lightweight materials. Exterior wall facing material can use metal hangs Taiwan, facing the cement particleboard, composite materials, etc. Doors and Windows are used in a variety of lightweight materials doors and Windows. Light steel structure housing system has the general advantages of steel structure, but compared with other structures, appears more prominent feature: (1) light weight structure: basic burden is small, can significantly reduce the cost, especially applicable to the geological conditions of poor areas; Structural seismic response is small, for structural aseismic measures cost less, suitable for earthquakes; Production, transportation, installation, convenient retaining, reduce the cost of artificial and mechanical. (2) the construction cycle short, quick return of investment, the fund risk is low, high investment return. (3) the factory production, on-site assembly: wet operation, noise, dust and garbage, less affected by the climate small; Without the use of clay brick, disassembly and recycling, in line with the national land resources policy, environmental protection and sustainable development strategy; Component standardization production in the factory, quality is stable, be helpful for housing industrialization. (4) using new type of lightweight enclosure materials, no combustion, no mildew, not bug eat by moth; Decorate once in place, less maintenance; Pipeline can be dark buried in the wall and floor structure; In heat preservation, heat insulation, sound insulation performance is better than traditional structure housing, so residential comfort better. (5) high bearing capacity of the wall, the wall thickness is small, increase effective use of space, make the light steel structure housing and the cost of the actual unit of usable floor area close to the cost of a brick structure. 6. Prefabricated light steel structure residence has good comprehensive economic benefits.