An embedded external prestressing implementation system and its construction method for strengthening RC columns

Abstract

The invention discloses an embedded external prestressing implementation system and a construction method for strengthening RC columns, which include steel strand laying grooves, prestressed steel strands, end anchoring devices, prestressed transverse stretching devices, traction line lifting devices and Prestressing device. The surface of the reinforced concrete column to be reinforced is opened in the form of m coiled helical strand routing trough and n vertical grooves; prestressed horizontal tensioning devices are arranged at the intersection of the vertical grooves and the steel strand laying grooves; the pulling wire lifting device includes pulling wires and m a traction line buckle; when the prestressing device pulls the traction line downward, m A pull wire clip will squeeze m A prestressed transverse tension device, so that m A transverse tensioning component is stretched transversely, thereby making the prestressed steel strand transversely stretched. The present invention adopts the way of transverse stretching, and only needs to provide 1 / 5~1 / 7 of the stretching force during longitudinal stretching to achieve the expected stretching effect. At the same time, it adopts anchoring first and then tensioning, which facilitates anchoring at the end and greatly reduces the difficulty of anchoring.

Description

technical field [0001] The invention relates to the field of reinforced concrete reinforcement, in particular to an embedded external prestress implementation system and a construction method for reinforcing RC columns. Background technique [0002] With the increase of the service life, the mechanical properties of reinforced concrete structures will continue to degrade. Under the action of natural disasters such as earthquakes, the structure will be damaged due to insufficient bearing capacity, which seriously affects the normal use of buildings. Therefore, it is necessary to take effective measures for reinforced concrete structures. The structure is reinforced. For reinforced concrete columns, the current common reinforcement methods include external steel sheet method, outsourcing FRP method, etc. The principle is mainly to increase the lateral restraint, thereby increasing the bearing capacity of the column. However, the general external reinforcement method cannot ef...

AI Technical Summary

Problems solved by technology

[0007] 3. After reinforcement, the fiber cloth and its anchorage end are exposed on the surface of the column without a protective layer. Its anti-aging performance and fire resistance are poor, and it is easy to fail in the natural environment, and its durability is not strong

Its structure is relatively simple, but its essence is still to apply prestress in the way of longitudinal tension. The requirements for the prestress application device are relatively high, the construction is inconvenient, and the applicability of this device is poor. Each set of reinforcement devices can only adapt to its relative size. Corresponding column, not universally applicable

In addition, when the above devices are reinforced, each reinforcement layer on the component works independently, and it is difficult to ensure that the prestress of the entire column is uniformly applied during reinforcement, which affects the integrity of the reinforcement.

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