Building exterior decoration as the most direct expression of visual expression of the construction of the language, as major architects to explore, unconventional platform. Perforated aluminum quickly differentiates itself among the many materials used in building skin finishes and sunshades.
1 perforated aluminum elements
1.1 Perforation rate
The perforation rate is the core factor that affects the perforation of aluminum panels in building skin and is the key factor that affects the expression of visual perception and reduces the energy consumption of buildings.
⑴ perforation rate and visual clarity
Perforated aluminum perforated rate settings, the application of the building skin will have different indoor and outdoor visual effects. During the day, when looking from the outside to the inside of the room, the perforation signboard epidermis mainly expresses the whole effect of the rest of the building, which can avoid the observation of the outdoor talk on the inside of the room and better maintain the privacy of the interior space. When looking from the inside to the outside, Perforated aluminum skin to the outdoor landscape to form a certain degree of obstruction, different perforation rate of the impact of the outdoor scene is now observed a greater degree of difference. When the perforated aluminum is low, the effect of blocking the outdoor scene is obvious with the perforated aluminum plate; when the perforated ratio is high, the human eye can still feel the outdoor landscape through the pores of the perforated plate through the superposition of the visual scene and the complementing principle.
⑵ perforation rate and shading effect
Through the different perforation rate lighting experiment can know: perforation aluminum perforated rate lower. Shading the better. The lower the perforation rate, the less severe the radiation received, the better the shading effect. Therefore, the same thickness, the same aperture size under the premise, the lower the perforation rate, the better the corresponding shading effect.
Perforated aluminum perforated rate changes can reduce the amount of light into the room, and with the increase of perforation rate, increasing the light coefficient. The use of side windows for the conference room, office, classroom and other space perforation aluminum, perforated rate of 22.3% can meet the “architectural lighting design standards” lighting requirements.
1.2 aperture
Pore size is one of the influencing factors of perforated aluminum plate unit. Controlling the hole diameter, hole spacing and arrangement of punching holes can affect the visual clarity of the perforated plate faulty skin to create a novel visual effect, which can be combined with the perforation rate, the thickness of the plate and other factors To reduce solar radiation heat, reducing energy consumption.
Perforated aluminum plate fixed aperture to create a homogeneous visual effect, if the aperture change treatment, but also to change the image of the building. The uneven size and complicated circular holes in the building’s epidermis increase the lively atmosphere of the building and provide a window for indoor observation.
1.3 thickness
By the processing costs, the weight of the unit, flatness and other factors, as the outer skin often used perforated aluminum plate thickness of 2.0mm ~ 6.0mm conventional board. As the perforation rate increases, the plate’s flatness is affected. Thickness enhancement is one of the ways to increase cell strength.
1.4 plate type
Plate has a flat-shaped, folded plate, wavy, zigzag and short-folded plate-shaped points. As the perforation rate increases, the strength of perforated aluminum plate tends to weaken. The choice of plate type affects the strength of the perforated aluminum plate, which in turn affects the size of the perforated plate module, the number of keels that play the role of connection, the overall effect expression, and the like.
2. Perforated aluminum in the curtain wall construction applications
2.1 visual overall sense
Perforated aluminum skin wrapping this office building, teaching building facade, with other materials together to form a homogeneous facade, rich skin texture and level, while adjusting the indoor lighting, shade conditions. In buildings with complex functions such as cultural complexes and urban complexes, the perforated aluminum skin can obstruct the irregular windows in the building interface and unify the architectural language. At the same time, the perforation rate or the combination of the epidermis can also meet the needs Different functions of the room on the room line of sight, lighting, shade and other different needs. According to its overall visual effects, can be divided into two kinds of homogeneous and heterogeneous.
⑴ homogeneous visual effects. The homogeneous visual effect is achieved by a homogeneous skin structure of a perforated aluminum plate unit of uniform perforation rate and an aluminum plate unit. This construction, combined with keel systems or other materials, is often used to create a complete, uniform architectural skin interface. A light, breathable and translucent perforated aluminum skin is attached to the outside of the building’s climate boundary to soften the building’s image. The indoor and outdoor spaces are subject to subtle changes due to the diffuse effect of the perforated aluminum plate and the filtering of the light.
⑵ heterogeneous visual effects
① cell perforation rate is not homogeneous. The skin of the unit constitutes a homogeneous heterogeneous perforated aluminum perforated unit as the outer skin can adapt to different functional requirements of the interior of the building to meet the lighting, shade requirements, is the adaptability of its use.
② cell perforation homogeneous unit of the skin composition of non-homogeneous
A gradient effect. Adjusting the perforation rate of perforated aluminum or combining the keel system and other materials can create the effect of gradual skin tapping, which is adaptable to the functions of the urban environment and interior.
B pattern effect. Patterning is the more common method of perforated aluminum plate texture processing, by changing the perforation rate of the plate to form a specific meaning of the pattern, giving the epidermis to culture, geographical significance.
⑶ location effect
Perforated aluminum skin around the building, looking from the outside to the interior, the epidermis as a “figure” and the interior space as the “bottom”, the outdoor space brightness is higher than the indoor, epidermis “map” as the visual focus, and as light and observation angle changes You can feel the degree of openness of the architectural interface is also different. When looking from the outside to the outside of the room, the perforated aluminum skin is “figure” and the outside is “bottom”. Since the outdoor space brightness is higher than the interior space, the human eye does not consciously capture the space with high brightness, passes through the perforated aluminum plate with high puncture rate Visual scene overlay processing can still fully experience the outdoor scenery.
The application of the night scene as the main light source can be divided into two kinds of internal and external lighting. According to the same principle, the luminous effect of the night light is better than the outdoor space after entering the night. The relationship between the epidermis and the interior and exterior of the skin is interchanged with the daytime, and the light is transmitted through the epidermis of the perforated aluminum panel to infect the outdoors. At this moment, the building emits a soft light from the inside, which is lighter at night.
2.2 construction method
⑴ outer skin of the main body
Perforated aluminum as the main body of the external performance of the building, different plate, the perforated aluminum structure of the overall effect is different. As a complete and powerful image of the building standing in the open natural environment, rich shape perforated aluminum cover the facade of the building, the light through the building skin filtration, the light into the interior of the building has become very soft, to create indoor A very good light environment.
⑵ outer skin composition elements
Perforated aluminum keel system can be juxtaposed with the aluminum unit to form the outer skin system. According to the size of the perforated aluminum unit module, the keel system often uses a homogeneous grid to divide the building facades and emphasizes the scale of the facade.
2.3 building physical environment
⑴ shading characteristics of the application. Building indoor heat is mainly through the perforation of aluminum holes, passed through the cavity to the inner layer, select the appropriate perforated aluminum skin form of sunshade, perforation rate is the key to affect the sunshade effect.
⑵ lighting characteristics of the application. Should consider lighting, shading characteristics. By setting the appropriate perforation rate, the same piece of perforated aluminum can achieve shading effect, but also to meet the indoor lighting needs. Different types of indoor lighting on the indoor lighting requirements are different, the perforated aluminum perforated rate changes can respond to different lighting needs.
⑶ ventilation characteristics of the application. Perforated aluminum as a building skin often used as an open external circulation system ventilation curtain wall, suitable for hot summer and cold winter area. Ventilation Energy saving and environmental protection curtain wall can save energy when heating than traditional curtain wall.
