Deformed steel bar semi-grout sleeve joint

Abstract

The invention belongs to the technical field of sleeve joints, and particularly relates to a deformed steel bar semi-grout sleeve joint. The sleeve joint comprises a fixing sleeve; a conical threadedhole is formed in one end of the fixing sleeve; an annular sealing ring is arranged at the end of the fixing sleeve; a spiral groove is formed in the side wall of the fixing sleeve; an elastic spiralframework is spirally inserted into the spiral groove; an elastic fiber layer is arranged between the elastic spiral framework and the spiral groove; the inner wall and the outer wall of the elastic spiral framework are evenly provided with a plurality of obliquely-upward extrusion expansion columns; water absorption holes are formed in the outer walls of the extrusion expansion columns; water absorption expansion layers are arranged in the extrusion expansion columns; and spaces between the water absorption expansion layers and the extrusion expansion columns are filled with a cement expanding agent. Through cooperation of the elastic spiral framework and the extrusion expansion columns, grout cement can be tightly bonded to deformed steel bars and the inner wall of the fixing sleeve during setting, and thus the phenomenon that a connection portion of the fixing sleeve is disconnected or fractured due to external vibration or stretching is avoided.

Description

technical field [0001] The invention belongs to the technical field of sleeve joints, in particular to a threaded steel semi-grouting sleeve joint. Background technique [0002] With the popularization and application of prefabricated concrete structures, one of its key technologies—reinforcement connection technology has attracted more and more attention. At present, there are mainly two types of grouted rebar joints: full grouted rebar joints and semi-grouted rebar joints; The fully grouted steel bar joint has defects such as the length of the sleeve is long, and the sealing and positioning are difficult. [0003] And then make existing threaded steel when connecting, adopt semi-grouting type sleeve to connect mostly, and existing semi-grouting sleeve when connecting threaded steel, because the mode of laying of threaded steel and the environment of laying are different, and then make There will also be differences in the use of half-grout joints. [0004] It is used in ...

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Problems solved by technology

[0006] In order to make up for the deficiencies of the prior art, the invention proposes a threaded steel semi-grouting sleeve joint. The invention is mainly used to solve the problem that the existing semi-grouting joints are easily connected due to the strong wind force in mountainous areas, which may easily cause damage to the utility poles. The phenomenon of winding occurs at the top, and the bonding strength between the grouting cement and rebar and the inner wall of the fixed sleeve is low, which leads to the easy detachment or relative sliding of the joint connection of the half-grouting joint, which leads to the support column after pouring. Cracking occurs at the connection of rebar

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