Design method of ultrahigh-strength steel sleeve for prefabricated concrete structure and grouting connection device

Abstract

The invention discloses a design method of an ultrahigh-strength steel sleeve for a prefabricated concrete structure, and belongs to the technical field of prefabricated concrete structures. The design method comprises the following steps of calculating anchoring length needed by a stressed steel bar; determining the optimal wall thickness of the wall of an ultrahigh-strength sleeve; calculating the number and the size of shear keys; designing a welding end face and a welding process; the ultrahigh-strength steel sleeve is adopted, the yield strength of steel is greatly improved, the use amount of sleeve steel can be greatly reduced, emission of carbon dioxide in the steel production process is reduced, the designed sleeve size can greatly reduce the wall thickness of the sleeve, and under the condition that it is guaranteed that the outer diameter of the sleeve is not changed, the inner diameter of the ultrahigh-strength steel sleeve is larger than that of a common sleeve, the allowable error of the inner diameter of the sleeve is greatly increased, the mortar structure formed by pouring the super-hydrophobic flexible grouting material has super-high flexibility, the welding technology is adopted, and complex program steps are avoided.

Description

technical field [0001] The invention relates to the technical field of prefabricated assembled concrete structures, in particular to a design method of an ultra-high-strength steel sleeve for a prefabricated assembled concrete structure and a grouting connection device. Background technique [0002] The mechanical properties of the steel bar connection in the prefabricated concrete structure determine the overall performance of the prefabricated structure and the force transmission effect of the steel bar, and different sleeve connection methods will also affect the speed and cost of the prefabricated assembly. With the rapid development of prefabricated buildings in my country, semi-grouting sleeve connection is gradually becoming a main form of steel bar connection in precast concrete components, mainly used in prefabricated shear walls, prefabricated frame columns, prefabricated decorative panels and other component reinforcements connect. One end of the semi-grouting sle...

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Problems solved by technology

[0003] The existing commonly used semi-grouting sleeve steel bar connection method has problems such as excessive cost of manufacturing sleeve materials, too small allowable sleeve inner diameter error, cumbersome factory threading connection process, and too small elongation of the connection node.

These problems are not conducive to the realization of "rapid assembly and high assembly rate" of prefabricated buildings, are not conducive to the realization of "resilient cities" in high-intensity areas, and are not conducive to the realization of the goal of "carbon peak, carbon neutrality"

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