Cement-based profile for composite concrete beam, and construction method of composite concrete beam

[0173] Concrete beams are built with cement-based profiles, and conventional force analysis of a single material can be used. According to the layout of the beam structure, according to the elastic or plastic theory specified in Section 5 "Structural Analysis" of the national standard GB50010 "Code for Design of Concrete Structures" Calculate the required bending capacity M and shear capacity V of the concrete beam.

[0174] The concrete beam is divided into the first section and the second section to form a composite concrete beam. The first section selects cement-based profiles of different cross-sections according to the layout position, and arranges them on the lower side of the composite concrete beam as The formwork adopts one of the channel section or the L-shaped section; the I-shaped section is used when it is arranged in the center of the composite concrete beam.

[0175] The second section member is post-casting cement-based material according to design requirements...

[0185] Cement-based profiles are constructed using prefabricated formwork or 3D printing.

[0186] Among them, the prefabricated formwork method is used for construction. After the raw materials of the cement-based profile are mixed, they are poured into a mold for forming, maintained, and the mold is removed to obtain the cement-based profile. The mold is a customized steel mold. After the formwork is removed, the combined surface of the cement-based profile and the post-cast cement-based material is processed by chiseling or roughening.

[0187]Among them, the 3D printing method is used for construction, and the raw materials of the cement-based profiles are mixed as ink materials and input into the 3D printer for printing. 3D printing should be done in a factory using a 3D printer. The direction of 3D printing is perpendicular to the section of the profile, printing along the span direction of the beam. After the 3D printing is completed, no slippage is allowed between t...

[0189] According to the requirements of constructing the composite concrete beam in Example 1, the profiles prepared according to Example 2 with a channel section or two L-shaped sections are spliced ​​as the base formwork, and the temporary formwork is supported on both sides to form the overall formwork of the composite concrete beam , or directly build the overall formwork according to the general construction method. The temporary formwork is the beam side formwork. The beam side formwork is made of wood or steel.

[0190] Place the reinforcement cage or the profile with an I-shaped section prepared by the construction method of the cement-based profile in Example 2 in the above-mentioned integral formwork, then pour the post-cast cement-based material on the base formwork and the main component formwork, and then shape , maintenance, that is, composite concrete beams. Wherein, the post-casting cement-based material is selected from one of load-bearing cement-based mater...