Half-grouting steel bar connection sleeve for prefabricated column

Abstract

The invention discloses a half-grouting steel bar connection sleeve for a prefabricated column. The half-grouting steel bar connection sleeve for the prefabricated column comprises a sleeve body; thesleeve body is embedded in the column; the half-grouting steel bar connection sleeve for the prefabricated column is characterized in that the sleeve body is divided into three sections of an internalthread section, a grouting sleeve section and a conical transitional section, wherein the internal thread section is positioned at the upper part of the sleeve body and connected with a column steelbar through an internal thread; the grouting sleeve section is positioned at the lower part of the sleeve body and comprises a cavity which is symmetric relative to the center axis; a bearing platformreserved steel bar extends into the cavity of the grouting sleeve section; the bearing platform reserved steel bar and the grouting sleeve section are integrally connected by injecting high-strengthnon-shrink cement-based grouting material into the cavity of the grouting sleeve section; the conical transitional section is used for connecting the internal thread section with the grouting sleeve section; and a grout outlet is formed in the conical transitional section towards the inclined top. According to the half-grouting steel bar connection sleeve for the prefabricated column, through adoption of a special connection structure design and construction process, the reliable connection between the prefabricated column and a bearing platform is guaranteed, a thin section is not formed at the bottom of the column and connection performance requirements under adverse working conditions such as strong earthquakes and so on are satisfied.

Description

technical field [0001] The invention relates to the technical field of bridge engineering, in particular to a semi-grouted reinforcing bar connecting sleeve for a prefabricated assembly column. Background technique [0002] Because the cast-in-place construction of the bracket occupies a large area and has a great impact on the environment, it is difficult to meet the requirements of green and rapid construction; while the prefabricated bridge has a high degree of factoryization, good standardized production quality, fast construction speed, low project cost and environmental protection. It has gradually been popularized and applied in the upper and lower structures of bridges. The most critical technical difficulty in implementing prefabricated construction of the lower columns of bridges lies in the structural treatment of the connection between the column roots and the caps. [0003] In the prefabricated assembly structure of the prior art, the connection between the pre...

AI Technical Summary

Problems solved by technology

[0004] Due to the large size of the grouting sleeve used for bridges, the outer diameter of the connecting sleeve for a single steel bar is generally 70-100 mm, and the length is about 800 mm, resulting in poor matching and cooperative mechanical performance between the sleeve and the concrete section of the column, especially with the outer protective layer. The concrete cannot be well bonded, and the concrete protective layer at the bottom of the column is easy to fall off under the action of hysteretic reciprocating load

At the same time, since the prefabricated column assembly joint is located at the most unfavorable stress-bearing part at the junction of the column bottom and the cap top, under the action of longitudinal horizontal force and earthquake loads, repeated tensile and compressive stresses appear on the edge of the above-mentioned reinforced concrete column bottom assembly joint, forming Weak link, poor mechanical performance of structure such as earthquake resistance

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