FRP spiral bar enhanced stainless steel tube seawater and seasand concrete structure

Abstract

The invention discloses an FRP spiral bar enhanced stainless steel tube seawater and seasand concrete structure, which comprises a rectangular stainless steel tube (1), an anchoring part (2), an FRP spiral bar (3) and seawater and seasand concrete (4). The FRP spiral bar enhanced stainless steel tube seawater and seasand concrete structure is characterized in that the rectangular stainless steel tube (1) is made of an anticorrosion weather-resistant stainless steel material, the anchoring part (2) is a stainless steel block with a reserved hole, the FRP spiral bar (3) penetrates through the reserved hole of the anchoring part (2) to rotate upwards, the diameter of the reserved hole of the anchoring part (2) is 10mm or more lager than that of the FRP spiral bar, a gap between the FRP spiralbar (3) and the reserved hole of the anchoring part (2) is densely filled by seawater and seasand concrete, and the seawater and seasand concrete (4) is poured into the rectangular stainless steel tube (1). The structure has the advantages of high bearing capacity, good ductility and good durability; seasand aggregate and seawater can be directly utilized to prepare poured seawater and seasand concrete; the structure has economic engineering construction cost, saves resources and is especially suitable for vertical structural members of island engineers and coastal regions.

Description

technical field [0001] The invention relates to a combined structure, in particular to an FRP spiral reinforced stainless steel pipe seawater sea sand concrete structure, which can be widely used in the technical field of civil engineering structures. Background technique [0002] Concrete-filled steel tubes have the advantages of high strength, light weight, large section bending stiffness, corrosion resistance, and good fire performance. At the same time, they can be used as a formwork for core concrete and have good mechanical properties. Therefore, in construction projects, they are favored by design and construction units. Approved, especially widely used in high-rise building construction. Compared with circular concrete-filled steel pipe, rectangular concrete-filled steel pipe has poorer binding force on core concrete, but rectangular concrete-filled steel pipe has the advantages of good ductility, convenient construction of joints, and simple building layout. Therefo...

AI Technical Summary

Problems solved by technology

However, the rectangular steel pipe has a weak restraining effect on the core concrete, and the pipe wall is more prone to elastic buckling, which greatly reduces the structural bearing capacity and ductility, which is not conducive to the full play of the mechanical properties of the steel pipe and concrete

[0003] In order to overcome the problem that the rectangular steel pipe wall is prone to local elastic buckling and the binding force on the core concrete is not strong, researchers and engineering practitioners have taken some measures to overcome this problem, such as welding transverse and longitudinal stiffeners, welding studs, welding tie rods , Welding circular stirrups and placing spiral bars, etc., such as Chinese Patent No. "CN 102003042A", which discloses a "Screw Stirrup Square Steel Tube Concrete Column and Its Manufacturing Method", in which the rectangular steel tube and the spiral stirrup Through the spot welding connection, the spiral stirrup rectangular steel pipe is formed, and the concrete is directly poured into the spiral stirrup rectangular steel pipe. Although this structure has a certain improvement on the performance of the rectangular steel pipe concrete, the spot welding connection will affect the size of the spiral stirrup and the inner wall of the steel pipe. The matching degree is high, and the structure does not have corrosion resistance, cannot utilize marine resources and is suitable for marine environments

[0004] At present, river sand and fresh water resources, which are the main raw materials for concrete, are seriously scarce, which seriously restricts the development of engineering construction in my country. In addition, a large number of infrastructure constructions are being carried out on the islands and reefs of the South my country Sea. The structure poses new challenges. If the seawater and seawater aggregates can be directly used to cast high-performance and high-durability concrete structures, it will have extraordinary engineering practical significance

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