A reinforcement structure and its construction method for the low strength of the grouting material in the sleeve

Abstract

The invention discloses a reinforcing structure for low strength of slurry in sleeves. The reinforcing structure covers each sleeve grouting connecting joint at the bottom of a prefabricated shear wall. A reinforcing structure body of the single sleeve grouting connecting joint comprises one sleeve, a connecting steel bar, a grouting material, a chiseling area, pre-bent additional steel bars and ultra-high performance concrete. When the sleeves and the connecting steel bars are in grouting connection through the grouting materials, each sleeve and the corresponding connecting steel bar are welded and connected through two pre-bent additional steel bars, chiseling areas are located on sleeve bodies of the sleeves where the pre-bent additional steel bars are located and the peripheries of the connecting steel bars, and the chiseling areas are filled with the ultra-high performance concrete. The invention further provides a construction method of the above reinforcing structure to guide construction and meet reinforcement requirements. The original sleeve grouting connecting joints can be integrally retained in the reinforcing construction process, the damage to an original structureis reduced, the construction safety is improved, the reinforcing connection mode of the structure is simple, the engineering quantity is small, and the cost is controllable.

Description

technical field [0001] The invention relates to the technical field of prefabricated buildings, in particular to a reinforcement structure and a construction method for truncated connecting steel bars in a sleeve. Background technique [0002] At present, most of the vertical connections of reinforced steel bars in my country's prefabricated concrete structures are connected by sleeve grouting, which is a method of inserting steel bars into metal sleeves embedded in prefabricated concrete components, and pouring high-strength, micro-expansion cement. The steel bar butt connection method realized by base grouting material. In the sleeve grouting connection, the compressive strength of the grouting material is the key index of its material properties, and it is also the main determinant of the anchorage force between the connecting steel bar and the sleeve. The connection nodes of prefabricated components are the theoretical weak link of prefabricated concrete structures, and ...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that cutting off all the sleeves will cause great damage to the original structure, and the length of the one-sided lap welding of the steel bars will further increase the amount of concrete chiseling, which is not effective for the remaining value of the sleeve grouting connection joints Utilization, higher economic cost

Another method is to dismantle the problematic components and remake the components by cast-in-place. This method is more difficult to operate because the upper floors have already been installed, and the project volume is larger and the economic cost is higher.

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