Bamboo composite pipe-steel pipe internal-external constraint concrete composite structure

Abstract

The invention discloses a bamboo composite pipe-steel pipe internal-external constraint concrete composite structure. The bamboo composite pipe-steel pipe internal-external constraint concrete composite structure is characterized in that the cross section of the bamboo composite pipe-steel pipe internal-external constraint concrete composite structure is sequentially composed of a bamboo composite pipe (1), sandwich concrete (2) and an inner steel pipe (3) from outside to inside; the bamboo composite pipe (1) sequentially comprises an isolating layer (11), a bamboo fiber strengthened composite layer (12) and an outer protective layer (13) from inside to outside; the bamboo fiber strengthened composite layer (12) is formed by continuously and evenly winding and solidifying one or more layers of bamboo fibers which are impregnated with resin adhesive on the outer wall of the isolating layer (11); the included angle between the fiber direction of the bamboo fibers and the circumferential direction of the bamboo composite pipe (1) ranges from minus 45 degrees to 45 degrees; the outer surface of the bamboo fiber strengthened composite layer (12) is coated with the outer protective layer (13); the inner steel pipe (3) is located in the cross section; the space between the bamboo composite pipe(1) and the inner steel pipe (3) is filled with the sandwich concrete (2); and the inner steel pipe (3) is internally hollow. The structure is high in bearing capacity, good in stiffness, ductility and shock resistance and has good construction performance and durability, the cross section inertia moment is large, concrete consumption is low, and construction cost is low; and the sustainable bamboo source in China is sufficiently utilized, and property advantages good toughness and high longitudinal tension strength of bamboo t are brought into play to the maximum extent.

Description

technical field [0001] The invention belongs to the technical field of civil engineering structures, and in particular relates to a concrete composite structure, in particular to a bamboo composite pipe-steel pipe internally and externally constrained concrete composite structure. Background technique [0002] The concrete-filled steel tube structure is a new composite structure formed by filling concrete into steel tubes. Since the steel tube concrete structure can more effectively utilize the respective advantages of steel and concrete, the concrete can be placed in a three-dimensional compression state in the structure, and its compressive strength can be doubled, while overcoming the local buckling of the steel tube structure The disadvantages of engineering applications are becoming more and more extensive. Solid steel tube concrete is usually used for axial compression or compression-bending members with small load eccentricity. However, when the slenderness ratio of...

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Problems solved by technology

For example, Chinese Patent No. "200910248425.3" discloses a "circular cross-section steel-concrete-FRP solid composite column". The outer layer of the structure is a steel pipe, and the inner layer is a fiber tube. Concrete, although this structure has some common advantages of steel tube concrete and fiber tube concrete, but the structural steel tube is on the outer wall of the structure, its corrosion resistance and fire resistance are poor, and the fiber tube is solid inside, which increases the amount of concrete. The application cannot meet the economic requirements

Another example is Chinese Patent No. "200710191092.6", which discloses a "steel pipe-FRP pipe filled with concrete composite structure", which is formed by steel pipes on the outer wall, FRP pipes on the inner wall, and concrete filled between the two. Hollow pipe column, this invention has good structural mechanical performance and seismic performance, can reduce the structural weight and improve the bending stiffness of the structure, but because the structural steel pipe is on the outer wall, under long-term natural factors, the steel pipe is prone to corrosion damage , leading to a reduction in the structural bearing capacity, and the main raw material of the FRP pipe in this structure is fiber with high energy consumption, and the resin is a petrochemical synthetic product. The products and waste materials are not recyclable and not environmentally friendly. Mineral resources, high energy consumption and high emissions, non-renewable resources

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