Prestressed extension device and extension method

Abstract

The application discloses a prestressed lengthening device and a lengthening method, which relate to the technical field of bridge construction. Area, the second area, the extension device includes: several first prestressed tendons and second prestressed tendons; at least two bridge decks connected in sequence, each bridge deck is anchored at least one on the side away from the first area The first prestressed tendons are anchored to at least one second prestressed tendon on the side away from the second area; at the same time, the first prestressed tendons are passed through the first area and the bridge deck, and the first prestressed tendons are placed on the bridge deck One end on the bridge is the first tension end, and the other end is the first anchor end; the second prestressed tendon is pierced on the bridge deck and the second area, and the end of the second prestressed tendon on the bridge deck is the second anchor end , and the other end is the second tension end. The application can dispersely arrange anchor points and tension points in sections, and while achieving the purpose of lengthening the prestress, it also reduces the thickness requirement for the bridge deck.

Description

technical field [0001] The application relates to the technical field of bridge construction, in particular to a prestressed extension device and an extension method. Background technique [0002] In the span-by-span construction of concrete continuous beams, the prestressed tendons are usually tensioned at both ends of the first span, and single-end tensioned at the other spans. Traditional steel truss-concrete composite beams and steel box-concrete composite beams are only set in the negative moment area. Longitudinal prestress, the positive bending moment area does not set longitudinal prestress, and the negative bending moment area with prestress often sets sawtooth blocks. [0003] Among them, longer prestressed tendons are usually extended by using extenders. When the longitudinal prestressed tendons set in the negative moment area need to be lengthened and stretched, generally prestressed extenders are used on bridge decks that meet the thickness requirements for len...

AI Technical Summary

Problems solved by technology

The installation of prestressed extenders also requires a wide notch on the longitudinal bridge side of the bridge deck, and the steel bars in the transverse bridge direction need to be disconnected, which will affect the force on the bridge deck, and too many sawtooth blocks will not cause problems. It is beneficial to the prefabrication of the bridge deck and affects the structural beauty

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