Steel bar butt joint connecting structure and method based on corrugated pipe slurry anchor

Abstract

The invention discloses a steel bar butt joint connecting structure and method based on a corrugated pipe slurry anchor. The connecting structure comprises a to-be-connected steel bar, a connecting steel bar, a corrugated pipe and a steel bar cage, wherein upset head steel bars are adopted as the to-be-connected steel bar and the connecting steel bar, and the to-be-connected steel bar and the connecting steel bar are arranged in the corrugated pipe in a butt joint manner; and the steel bar cage is arranged on the periphery of the corrugated pipe, and the corrugated pipe and the steel bar cage are buried in prefabricated concrete. The connecting method of the steel bar butt joint connecting structure comprises the steps that the upset head steel bars are adopted as the to-be-connected steel bar and the connecting steel bar; during component prefabrication, the to-be-connected steel bar is inserted in the corrugated pipe, the steel bar cage is arranged on the periphery of the corrugated pipe, and the to-be-connected steel bar and the connecting steel bar are overall buried in the prefabricated concrete; and during component connection, the connecting steel bar is inserted in the corrugated pipe, a high-strength and low-shrinkage grouting material is poured in the corrugated pipe, and a steel bar butt joint connecting connector based on the corrugated pipe slurry anchor is formed after the grouting material is hardened. By means of the steel bar butt joint connecting structure and method, reliable butt joint connection of the to-be-connected steel bar and the connecting steel bar can be achieved, cost is low, and the installing efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of prefabricated concrete structures, and in particular relates to a steel bar butt connection structure and connection method based on corrugated pipe grout anchors. Background technique [0002] In the current prefabricated concrete structure, the steel sleeve grouting connection method and the grout anchor lap connection method are mainly used for the connection of prefabricated components to realize the continuous force transmission of the prefabricated components and ensure the mechanical performance and earthquake resistance of the components. [0003] For the steel sleeve grouting connection method, the processing technology of steel sleeve products is relatively complicated and the cost is high; due to the size limitation of the sleeve, the clear distance between the connecting steel bar and the inner wall of the sleeve is small, and the accuracy of the embedded position of the sleeve is high. At the...

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Problems solved by technology

[0003] For the steel sleeve grouting connection method, the processing technology of the steel sleeve product is relatively complicated and the cost is high; due to the size limitation of the sleeve, the clear distance between the connecting steel bar and the inner wall of the sleeve is small, and the accuracy of the embedded position of the sleeve is high. At the same time, it caused difficulty in connecting the steel bars during on-site installation, and the construction efficiency and quality were affected to a certain extent; the anchorage length of the steel bar should be 8 times the diameter of the connecting steel bar for the sleeve grouting connection, which is sensitive to the fullness of the grouting, resulting in the sleeve grouting connection joints Quality has long been questioned

[0004] For the grout-anchor lap connection method, although the cost is relatively low, due to its lap joint force transmission characteristics, concrete splitting damage is prone to occur, and the mechanical performance of the joint cannot be tested by effective inspection methods, and its reliability has not been recognized for a long time. Significantly limited scope of application

[0005] Therefore, in order to promote the improvement of the steel bar connection method of prefabricated concrete structures, it is urgent to find a new steel bar butt joint connection method, solve the technical problems of high cost, high precision requirements, and difficult installation and construction of the steel sleeve grouting connection method, and eliminate the grout anchor overlap. Doubts about unreliable lap performance of connection methods

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