Self-locking steel bar connecting grouting sleeve

Abstract

The invention discloses a self-locking steel bar connecting grouting sleeve which comprises a sleeve body. The sleeve body is provided with a grouting hole and a grout outlet hole, a grouting cavity communicated with the grouting hole and the grout outlet hole is formed in the sleeve body, the inner wall of the grouting cavity is provided with ribs or corrugations, and the inner wall of the grouting cavity is also provided with multiple clamping tongues. On one hand, when steel bars are inserted into the self-locking steel bar connecting grouting sleeve, a mechanical anchoring force can be effectively provided through the self-locking effect between the steel bars and threaded steel bar ribs; on the other hand, when connected steel bars inserted into prefabricated members have deviations,and when the steel bars are inserted into the grouting sleeve, the situation of wall attachment or eccentricity occurring during connection of the self-locking steel bar connecting grouting sleeve canbe effectively avoided through appropriate position correction of the steel bars due to the vertical radial effect of the clamping tongues.

Description

technical field [0001] The invention relates to the technical field of civil engineering and transportation, in particular to a self-locking grouting sleeve for connecting steel bars. Background technique [0002] With the development and wide application of my country's construction industrialization, the connection technology and measures between concrete prefabricated components have become more and more key technologies and bottlenecks for promoting the prefabricated concrete structure and improving the quality of the prefabricated concrete structure, especially the connection between steel bars. connection technology. Grouting sleeve connection can reduce the amount of wet work on the construction site, and the connection between prefabricated components can be completed only through grouting anchorage. The construction speed is fast and the construction site does not require formwork support and concrete. The construction is green, convenient and economical. , this con...

AI Technical Summary

Problems solved by technology

Due to the complex reinforcement at the joint joints of prefabricated concrete, the construction space is small, especially at the joints between prefabricated shear walls and prefabricated columns (beams), if ordinary small-diameter steel bars are used, the number of longitudinal bars and stirrups is large and the reinforcement is complicated , the number of steel bars that need to be connected is large, and more grouting sleeves and connection construction parts need to be arranged. Therefore, cluster reinforcement has great advantages, especially the technology of high-strength steel reinforcement with large diameter and large spacing is becoming more and more advanced. It is a technical means to reduce the construction difficulty of prefabricated concrete structures and improve the construction efficiency of prefabricated concrete structures. However, there are few grouting sleeves for large-diameter high-strength steel bars at present, and a new type of grouting sleeve needs to be proposed to solve the above problems.

[0004] The current grouting sleeve steel bar connection is mainly through the grouting material in the grouting sleeve to provide anchoring force to connect the steel bars. If high-strength steel bars with large diameter and large spacing are anchored, the length of the grouting sleeve and the strength of the grouting material need to be increased. However, , increasing the length of the grouting sleeve will greatly increase the difficulty of positioning and construction of the grouting sleeve in the prefabricated component. Using high-strength grouting material, due to the poor fluidity of the grouting material and the high brittleness of the material, will easily lead to unreliable grouting quality and prefabricated components. The deformation of the connection joints of the components is poor, resulting in poor energy dissipation capacity and seismic performance of the prefabricated concrete structure

At present, the ideal failure mode of grouting sleeve is steel bar breaking, but experiments by some scholars and researchers have shown that when there are situations such as sticking to the wall or inaccurate positioning, and grouting is not dense, the failure mode of steel bar pulling out is very easy to occur. The main reason is that the shear bearing capacity of the grouting material of the grouting sleeve is lower than the ultimate bearing capacity of the steel bar. If this happens, it will bring greater risks to the prefabricated concrete structure

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