Precast beam bottom bar anchorage device, precast beam composed of precast beam bottom bar anchorage device and connecting joint

Abstract

The invention provides a precast beam bottom bar anchorage device, a precast beam composed of the precast beam bottom bar anchorage device and a connecting joint. A precast beam bottom bar is anchored to a joint area at the beam end through a flexible steel wire rope or a prestressed bar, one end of the steel wire rope or the prestressed bar presses a straight thread sleeve to be mechanically connected with the precast beam bottom bar through a straight thread sleeve connector, and the anchoring sleeve is pressed at the other end to enhance the anchoring performance of the steel wire rope or the prestressed tendon in the joint area. The precast beam bottom bar is anchored in the joint area through the flexible steel wire rope or the prestressed bar, the problems of steel bar collision and the like caused by the fact that a traditional prefabricated beam bottom bar directly stretches into the joint area to be anchored can be solved, the precast beam installation efficiency is improved, and machining allowable errors are relieved; and meanwhile, the minimum width of the precast beam constructed by adopting the anchorage device and the connecting joint can be reduced by more than 100mm compared with that of the precast beam constructed by adopting the traditional form.

Description

technical field [0001] The invention belongs to the technical field of construction, relates to an assembled frame structure, and in particular to a prefabricated beam bottom reinforcement anchorage and a prefabricated beam and a connecting node composed thereof. Background technique [0002] The prefabricated frame structure is a typical form of prefabricated concrete structure. The structural components such as columns, main beams, secondary beams and floor slabs of the main structure are prefabricated in the factory and assembled on site to form a whole. In order to meet the needs of anti-seismic fortification, the prefabricated frame structures in my country are mostly designed as prefabricated integral frame structures with the same anti-seismic performance as cast-in-place. Considering the adjustment of prefabricated component transportation, hoisting and on-site installation accuracy, the assembled monolithic frame structure columns are mostly split into independent p...

AI Technical Summary

Problems solved by technology

In order to avoid steel bar collision, the bottom reinforcement of the prefabricated main girder extending into the joint area needs to be bent, which makes it difficult to standardize the position of the bottom reinforcement of the prefabricated main girder. The amount of drawing in the design process is large, and errors are prone to occur in the production process of the prefabricated main girder

In order to solve the collision problem of the bottom reinforcement of the prefabricated main girder, the section width of the prefabricated main girder often needs to be not less than 350mm, which is obviously greater than the requirement for the width of the main girder of the cast-in-place frame structure, resulting in a certain cost increase

At the same time, in order to avoid the collision of the bottom reinforcement of the prefabricated main girders extending into the node area in two directions, the elevations of the bottom surfaces of the prefabricated main girders in the two directions must be staggered by more than 50 mm, resulting in inconsistent heights of the main girders in the two directions. The height of the main girder has caused great difficulties to the architectural design and structural design

Due to the complicated avoidance design of steel bars and the high probability of design errors, it is inevitable that the bottom bars of the prefabricated main girders in different directions collide with each other during on-site construction. It is difficult or even impossible to install the prefabricated main girders on site.

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