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

Abstract

The invention provides a spiral steel bar connector with a cone-shaped barrel and a construction method for the spiral steel bar connector. The spiral steel bar connector comprises the cone-shaped barrel, wherein a through hole is formed in the cone-shaped barrel; the circumference of the large-diameter end of the cone-shaped barrel is connected with one end of each of inclined supporting ribs; the other end of each inclined supporting rib is connected with one end of a corresponding longitudinal supporting rib respectively; the longitudinal supporting ribs are uniformly distributed within a range of 360 degrees; the diameters of the outer walls of the longitudinal supporting ribs are the same as the outer diameter of the large-diameter end of the cone-shaped barrel; the cone-shaped barrel, the inclined supporting ribs, the longitudinal supporting ribs, spiral supporting ribs and supporting rings are connected to form a latticed barrel body; a barrel cavity is formed in the latticed barrel body; a plurality of space lattices are distributed on the circumference of the latticed barrel body; a metal sleeve is arranged outside the space latticed barrel body. The preparation method for the spiral steel bar connector comprises the following steps of putting a columnar die into the barrel cavity, pouring concrete to the periphery of the columnar die, taking out the die, and pouring concrete into a connection hole to complete construction. According to the spiral steel bar connector, the structure of a steel bar connector in the prior art is completely changed, so that the shortcomings 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 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 between the o...

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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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