A spiral space grid steel bar connector with a cone and its construction method

Abstract

The invention provides a steel bar connector with an inner ring cylindrical space latticed structure and a construction method of the steel bar connector. The steel bar connector comprises first supporting rings and second supporting rings, wherein at least two longitudinal supporting ribs are connected between the first supporting rings and the second supporting rings; three or more than three inner ring supporting ribs are connected onto the inner walls of the longitudinal supporting ribs; the outer diameters of the first supporting rings are identical to those of the second supporting rings; the first supporting rings, the second supporting rings, the longitudinal supporting ribs and the inner ring supporting ribs are connected to form a latticed cylinder body; a cylindrical cavity of which the diameter of the upper part is identical to that of the lower part is formed in the latticed cylinder body; the first supporting rings, the second supporting rings, the inner ring supporting ribs and the longitudinal supporting ribs are connected to form a plurality of space lattices. A preparation method of the steel bar connector comprises the following steps of taking a columnar die and placing the columnar die into the cylindrical cavity; pouring concrete at the periphery of the columnar die; taking out the columnar die; pouring the concrete into connecting holes and finishing the construction. According to the steel bar connector and the construction method disclosed by the invention, the structure of the steel bar connector in the prior art is thoroughly changed, so that the defects existing in the prior art are overcome.

Description

technical field [0001] The invention relates to a steel bar connection device used on building objects, which is a spiral space grid steel bar connector with a cone and a construction method thereof. Background technique [0002] Existing steel bar connector is commonly called as grouting sleeve, and it adopts thicker tube wall to increase the strength of grouting sleeve. But when the tube wall is thicker, the diameter of the sleeve must be larger, and the grouting sleeve with a larger diameter cannot meet the national regulations in use. Concrete thickness requirements, this thickness is collectively referred to as the protective layer, the protective layer requirements for panels and walls is at least 15 mm, and the protective layer thickness of building beams or columns is at least 20 mm. The shortage of this grouting sleeve is: due to the The space is limited. When the position of the longitudinal reinforcement remains unchanged, the thickness of the protective layer be...

AI Technical Summary

Problems solved by technology

But when the tube wall is thicker, the diameter of the sleeve must be larger, and the grouting sleeve with a larger diameter cannot meet the national regulations in use. Concrete thickness requirements, this thickness is collectively referred to as the protective layer, the protective layer requirements for panels and walls is at least 15 mm, and the protective layer thickness of building beams or columns is at least 20 mm. The shortage of this grouting sleeve is: due to the The space is limited. When the position of the longitudinal reinforcement remains unchanged, the thickness of the protective layer between the outside of the grouting sleeve and the upper stirrup of the building component cannot meet the requirements of the national standard. Therefore, the longitudinal reinforcement in the concrete of the prefabricated component must be moved to the center of the interior. In order to increase the thickness of the protective layer between the steel bar connector and the building component stirrup, however, this will cause the longitudinal steel bar to be far away from the outer wall of the prefabricated part, resulting in a smaller ability to resist the bending moment of the wall, thus Reduce the mechanical performance of prefabricated components; at the same time, when the protective layer in the prefabricated component reaches the thicker requirement, it will cause the longitudinal reinforcement to move to the middle, affecting the ability of the prefabricated component to resist bending moments; when the prefabricated structural reinforcement moves inward , the ability to resist the bending moment becomes smaller. Therefore, the longitudinal reinforcement of the prefabricated component should be evenly distributed on both sides of the component and cannot move concentratedly in the middle. This requires the diameter of the grouting sleeve to be reduced to meet the requirements of the connection The distance of the longitudinal reinforcement moving to the middle of the prefabricated wall is as small as possible

However, the smaller the hole diameter of the grouting sleeve, the lower the grouting amount, resulting in reduced connection strength, and according to the national standard, the first horizontally distributed reinforcement of the shear wall is 50 mm from the bottom of the wall, but the height of the grouting sleeve is generally If it is larger than 100 mm, at least one horizontal stirrup must be provided outside the grouting sleeve located at the edge of the wall or at the connection part of the shear wall. The outer wall of the component is narrow, which cannot meet the requirements of the thickness of the concrete protective layer. Sometimes the steel bars are exposed, which leads to the corrosion of the steel bars, and the joint force of the steel bars and the concrete cannot be exerted, which seriously affects the building quality; in addition, the existing grouting sleeve is in use. , in order to meet the requirements of the national standard, it is necessary to add anti-cracking steel bars in the wall to prevent cracks in the concrete members after being stressed, resulting in increased construction costs and increased construction difficulty; the ring-shaped trapezoidal protrusions on the inner wall of the grouting sleeve are prone to fracture , leading to a substantial reduction in its strength

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