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Concrete filled steel tubular column reinforcing method based on fiber woven mesh

A technology of steel tube concrete columns and fiber woven mesh, which is applied in building maintenance, construction, climate change adaptation, etc., can solve problems such as degradation of bearing capacity, and achieve the effects of improving strength, delaying local buckling, and excellent impermeability

Pending Publication Date: 2021-06-29
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of bearing capacity degradation caused by external factors of CFST columns, realize rapid repair of CFST columns, and improve their corrosion resistance and high temperature resistance performance, this invention proposes a reinforcement method for CFST columns based on fiber braided mesh

Method used

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  • Concrete filled steel tubular column reinforcing method based on fiber woven mesh
  • Concrete filled steel tubular column reinforcing method based on fiber woven mesh
  • Concrete filled steel tubular column reinforcing method based on fiber woven mesh

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The type of braided mesh is bidirectional carbon fiber braided mesh, the prestress level is 30%, the mesh size is 20mm×20mm, the thickness of single bundle fiber is 0.5mm, the width is 1mm, the tensile strength of carbon fiber is 3400MPa, and the ultimate elongation rate is 1.5 %; The cutting circle radius of the metal rod in the tension anchor is 12mm, the arc angle is 270°, and the screw diameter is 12mm; the thickness of the early strength ECC layer is 30mm, and its composition is composed of sulphoaluminate cement, first-grade fly ash , water, fine sand, water reducing agent, early strength agent, PVA fiber, the corresponding specific gravity is sulphoaluminate cement: primary fly ash: water: fine sand: water reducing agent: early strength agent: PVA fiber = 1 :0.2: 0.4: 1: 0.005: 0.0005: 0.015, the early strength agent is lithium carbonate, the early strength ECC has a compressive strength of more than 30MPa within 6 hours, and the ultimate tensile strain is more th...

Embodiment 2

[0040]The type of woven mesh is unidirectional carbon fiber woven mesh, the prestress level is 30%, the mesh size is 10mm×10mm, the thickness of single bundle fiber is 0.5mm, the width is 0.5mm, the tensile strength of carbon fiber is 3400MPa, and the ultimate elongation 1.5%; the cutting circle radius of the metal rod in the tension anchor is 10mm, the arc angle is 240°, and the screw diameter is 10mm; the thickness of the early-strength ECC layer is 35mm, and its composition is composed of sulphoaluminate cement, first-grade powder Composition of coal ash, water, fine sand, water reducer, early strength agent, PVA fiber, the corresponding specific gravity is sulphoaluminate cement: primary fly ash: water: fine sand: water reducer: early strength agent: PVA fiber =1:0.25:0.5:0.8:0.003:0.0002:0.02, the early-strength agent is lithium carbonate, the early-strength ECC has a compressive strength of more than 30MPa within 12 hours, and an ultimate tensile strain of more than 2%. ...

Embodiment 3

[0042] The type of braided net is two-way basalt fiber braided net, the prestress level is 30%, the grid size is 10mm×10mm, the thickness of single bundle fiber is 1mm, the width is 2mm, the tensile strength of basalt fiber is 600MPa, and the ultimate elongation is 2.2%; the cutting circle radius of the metal rod in the tension anchor is 12mm, the arc angle is 270°, and the screw diameter is 14mm; the thickness of the early strength ECC layer is 40mm, and its composition is composed of sulphoaluminate cement, first-grade pulverized coal Composed of ash, water, fine sand, water reducer, early strength agent, and PVA fiber, the corresponding specific gravity is sulphoaluminate cement: primary fly ash: water: fine sand: water reducer: early strength agent: PVA fiber = 1: 0.1: 0.45: 0.8: 0.006: 0.001: 0.02, the early strength agent is lithium carbonate, the early strength ECC can achieve a compressive strength of more than 30MPa within 4 hours, and the ultimate tensile strain is mo...

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Abstract

The invention discloses a concrete filled steel tubular column reinforcing method based on a fiber woven mesh. The concrete filled steel tubular column reinforcing method comprises a concrete filled steel tubular column, the fiber woven mesh, a tension anchoring device and an early strength ECC; the reinforcing method comprises the specific reinforcing steps that the two ends of the fiber woven mesh are wound and pasted to two metal rods of the tension anchoring device through epoxy resin glue respectively, then the fiber woven mesh is wound and installed along the surface of the concrete filled steel tubular column, and prestress is applied in a nut screwing mode; and after the prestress is applied, the early strength ECC is sprayed to cover the woven mesh, and reinforcement is completed. According to the concrete filled steel tubular column reinforcing method, the circumferential prestress fiber woven mesh can achieve a large restraining effect, the restraining effect on core concrete in the concrete filled steel tubular column is further improved, and the bearing capacity of the concrete filled steel tubular column is obviously improved; ECC covering the surface of a steel pipe has the anti-cracking effect, the water seepage resistance and the chloride ion penetration resistance are good, and corrosion of the steel pipe can be inhibited; a reinforcing layer is good in high-temperature resistance, and fire resistance and high-temperature resistance of the concrete filled steel tubular column can be improved.

Description

technical field [0001] The invention relates to the technical field of building structure protection, in particular to a method for reinforcing steel pipe concrete columns based on fiber braided mesh. Background technique [0002] With the rapid development of my country's economy, the construction of super high-rise buildings and bridges in China has increased in recent years. In these buildings, concrete filled steel tubes have been widely used because of their excellent mechanical properties. Concrete filled steel tube utilizes the interaction between the steel tube and concrete in the process of stress, that is, the restraint effect of the steel tube on its core concrete. Under the axial compressive load, the concrete is under a three-dimensional compressive stress state, which can Delay the longitudinal cracking when it is under pressure, so that the strength of concrete can be improved, and the plasticity and toughness properties can be improved. At the same time, due...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04G23/02
CPCE04G23/02E04G23/0218E04G23/0225E04G2023/0251Y02A30/30
Inventor 卢亦焱李杉颜宇鸿梁鸿骏王文炜王思雨
Owner WUHAN UNIV
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