A cylindrical spiral structure steel bar connector and its construction method

Abstract

The invention provides a cylindrical spiral structure steel bar connector and its construction method, comprising a first support ring and a second support ring, at least two longitudinal support ribs are connected between the first support ring and the second support ring, and more The longitudinal support ribs are evenly distributed at 3600, the outer walls of the plurality of longitudinal support ribs are connected to the spiral support ribs, the spiral support ribs are evenly distributed on the height of the longitudinal support ribs, the outer diameters of the first support ring and the second support ring are equal, The spiral support ribs are connected with the longitudinal support ribs to form several space grids. A metal sleeve is installed outside the space grid-shaped cylinder. The shape of the metal sleeve is a cylinder. One end of the metal sleeve is open and the other end is provided with a through hole. The preparation method is as follows: taking a columnar mold and placing it in the cylinder cavity, pouring concrete on the outer periphery of the columnar mold, taking out the columnar mold, pouring concrete into the connecting hole, and then the construction is completed. The invention completely changes the structure of the steel bar connector in the prior art, so as to solve the deficiencies in the prior art.

Description

technical field [0001] The invention relates to a steel bar connection device used on building objects, which is a cylindrical spiral structure steel bar connector 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 bet...

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

Images