Anchoring-device-free prestress high-strength steel stand mesh U-shaped concrete member reinforcing method

Abstract

The invention discloses an anchoringdevice-free prestress high-strength steel stand mesh U-shaped concrete member reinforcing method. The method comprises the following steps that (1) a stretching bed is erected; (2) prestress steel strands are installed; (3) the prestress steel strands are stretched; (4) holes are punched in the bottom of a beam for steel bar planting; (5) U-shaped steel strands are installed; (6) polymer mortar is sprayed to the outer layer; and (7) the ends of the prestress steel strands on the fixed cross beam at the stretching end are cut off, the stretching bed is detached, and reinforcing is completed. No anchoring device is arranged in the stretching bed, the thickness of a reinforcing layer is small, the dead weight is low, the reinforcing layer is good in bonding performance, convenient and fast to construct, excellent in reinforcing effect and high in adaptability, and corner areas are not prone to cracking after reinforment.

Description

technical field [0001] The invention relates to the technical field of strengthening bridges or other building structures, in particular to a U-shaped method for strengthening concrete components with prestressed high-strength steel strand nets without an anchoring device. Background technique [0002] In order to prolong the service life of reinforced concrete beams, it is often necessary to reinforce them. How to strengthen or repair them without dismantling the original components is a hot spot in the industry. Among them, the prestressed steel strand reinforcement technology has the advantages of small weight increase, good durability, and good compatibility between mortar and concrete. It is favored by the reinforcement industry and is widely used in structural reinforcement projects such as bridge construction. However, in actual engineering, the prestressed steel strands are arranged as longitudinal reinforcement at the bottom of the beam, and the corners of the web a...

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Problems solved by technology

However, in actual engineering, the prestressed steel strands are arranged as longitudinal reinforcement at the bottom of the beam, and the corners of the web and the bottom of the beam are prone to cracking due to stress concentration; Angle steel and other tension anchoring devices will inevitably increase the thickness of the mortar reinforcement layer, thereby increasing the self-weight of the beam, and the actual adaptability of the project is not strong enough

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