Pier repairing apparatus and method based on lightweight prestressed stainless steel sheath

Abstract

The invention discloses a pier repairing apparatus based on a lightweight prestressed stainless steel sheath, comprising the sheath that sleeves an under-repair part of a pier, and a plurality of prestressed hoops arranged outside the sheath; one side of each prestressed hoop is provided with a tightening device. The method comprises: (1) cleaning loose concrete of a damaged region, and straightening bent rebars; (2) casting early strength fast-hardening concrete to the damaged region so that the cross-sectional area of the damaged region is restored to the original pier column level; (3) fixing stainless steel sheets that are cut in advance in a factory, to the outside of the damaged region of a pier, and connecting by welding after wrapping; (4) mounting prestressed hoops outside the sheets, and tightening the prestressed hoops with a wrench. The pier repairing apparatus based on the lightweight prestressed stainless steel sheath has the advantages that a damaged pier can be repairedwithin 24 hours, large-sized machinery for operation is not required, and operating can be performed only with few workers; the bearing capacity and ductility of the repaired prier can reach or exceed those of the original pier, and the requirements of post-disaster repairing for high speed and good economy can be met.

Description

technical field [0001] The invention relates to a rapid post-earthquake repair technology for bridge engineering, in particular to a bridge pier repair device and repair method based on a light prestressed stainless steel sheath. Background technique [0002] China is located between two major seismic belts in the world—the circum-Pacific seismic belt and the Eurasian seismic belt. It is squeezed by the Pacific plate, the Indian plate and the Philippine Sea plate, and earthquake disasters are relatively frequent. In recent decades, destructive earthquakes at home and abroad include: the Tangshan earthquake in China in 1976, the Loma Prieta earthquake in the United States in 1989, the Northridge earthquake in the United States in 1994, the Kocaeli earthquake in Turkey in 1999, the Kuril Islands earthquake in Japan in 2007, and the 2008 earthquake in my country. Wenchuan Earthquake, Yushu Earthquake in 2010, Christchurch Earthquake in New Zealand in 2011, etc. These earthquake...

AI Technical Summary

Problems solved by technology

At present, there are relatively few researches on the repair of bridge pier columns at home and abroad, and the subjective awareness of the demolition and reconstruction of damaged buildings after the earthquake is relatively strong.

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