Combined accessory of in-situ concrete 3-D printing horizontal bearing part and preparation method
A load-bearing component, concrete technology, applied in the direction of building components, structural elements, building construction, etc.
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Embodiment 1
[0043] In this embodiment, the in-situ concrete 3-D printed horizontal load-bearing component assembly is composed of 3-D printed concrete and a bottom net, and the 3-D printed concrete has fine aggregates with a particle size of 0.08mm-4.75mm, and The fluidity of the 3-D printed concrete is greater than or equal to 110mm and less than or equal to 190mm; the bottom net is a reinforcement mesh, the diameter of the reinforcement is greater than or equal to 0.5mm, and the mesh diameter of the reinforcement mesh is less than or equal to the fine aggregate particle 7.5 times (4.75mm×7.5) of the upper limit of fine aggregate particle size, and greater than or equal to 7.5 times (0.05mm×7.5) of the lower limit of fine aggregate particle size.
[0044] The fine aggregate is construction sand [comply with GB / T14684-2011], such as coarse sand, medium sand or fine sand [comply with GB / T14684-2011]. When bearing the weight of the first layer of 3-D printed concrete alone, the diameter of ...
Embodiment 2
[0047]A metal or non-metal mesh with a certain rigidity is used as the bottom mesh, and the first layer of concrete is printed directly on the bottom mesh. Since 3-D printed concrete has good cohesion, the concrete wraps the bottom mesh in the concrete after the first layer of printing. The concrete is integrated with the bottom net without collapsing. When the first layer of concrete solidifies and reaches a certain strength, subsequent layers of concrete can be continuously printed on it until it reaches a predetermined thickness. The bottom mesh can support the first layer of printed concrete alone, and then lay the steel skeleton on the first layer of concrete, or hang the bottom mesh under the steel skeleton and then print concrete on it. According to the structure of the horizontal load-bearing construction, the bottom net can be used as a flat or curved net, or it can be prefabricated into a V-shaped or wavy shape to enhance its rigidity.
[0048] In-situ concrete 3-D p...
Embodiment 3
[0057] Embodiment 3, the technological practice that has steel skeleton situation
[0058] Background introduction: The arched dome of a building, with a diagonal span of 3m and supported by four-corner columns, was fabricated by using in-situ unsupported concrete 3-D printing method.
[0059] The specific process is as follows:
[0060] (1) First make a reinforced skeleton according to the geometric dimensions of the curved surface of the arched dome. The four corners of the skeleton are bound or welded to the column supports. The rigidity of the skeleton can bear the construction load of the first layer of printing. Such as figure 1 shown.
[0061] (2) Use a steel wire mesh with a net mesh size of 10mm×10mm as the bottom mesh (the diameter of the steel wire is 1mm), bind it to the bottom of the skeleton, and place a 5mm thick block between the steel mesh and the skeleton to control the distance between the two. Such as Figure 2a the overall picture of and Figure 2b Th...
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