A concrete tie rod arch bridge suspender lower anchor end connection structure and its construction method

Abstract

The invention relates to an arch bridge structure, in particular to a connecting structure of anchorage ends of booms of a concrete tied arch bridge and a construction method of the connecting structure. The connecting structure of the anchorage ends of the booms of the concrete tied arch bridge comprises booms and a lug plate connecting fitting, wherein the lug plate connecting fitting comprises a pouring part and connecting part; the pouring part is poured in a tied beam; the connecting part is protruded above the tied beam; the bottoms of the booms are hinged and fixed to the connecting part, and a connecting arm is arranged at the bottoms of the booms; the connecting arm is connected with the connecting part of the lug plate connecting fitting. An upper preburied pipe penetrates through an arch rib, the upper ends of the booms penetrate through the upper preburied pipe to be connected with a tensioning device, and the tensioning device is compacted and fixed to a position above the arch rib. The connecting structure disclosed by the invention has the beneficial effects that an original concealed and invisible stress region is exposed to the upper edge of a concrete tied beam, the purpose that the booms are convenient to examine, and easy to maintain and exchange during the late curing of engineering can be realized, and the situation that the bridge is destroyed without warning caused by concealed damage generated at the anchorage ends of the booms can be fundamentally avoided.

Description

technical field [0001] The invention relates to an arch bridge structure, in particular to a connection structure of the lower anchor end of the suspender of a concrete tie-rod arch bridge and a construction method thereof. Background technique [0002] The upper end of the suspender of the existing concrete tie-bar arch bridge is anchored on the arch rib, and the lower end of the suspender passes through the pre-buried pipe in the concrete tie beam and is buried inside the tie beam near the bottom edge. After the suspender is stretched, it is sealed with concrete. anchor, the entire structure is hidden inside the tie beam; this design has the following problems in the bridge operation process: the bridge is often in a state of vibration under the excitation of wind, rain, vehicles, etc. Under the action, water erosion is prone to occur in the anchorage area of ​​the lower anchor end of the suspender, and long-term water erosion will cause corrosion and fatigue of the anchor...

AI Technical Summary

Problems solved by technology

[0002] The upper end of the suspender of the existing concrete tie-bar arch bridge is anchored on the arch rib, and the lower end of the suspender passes through the pre-buried pipe in the concrete tie beam and is buried inside the tie beam near the bottom edge. After the suspender is stretched, it is sealed with concrete. anchor, the entire structure is hidden inside the tie beam; this design has the following problems in the bridge operation process: the bridge is often in a state of vibration under the excitation of wind, rain, vehicles, etc. Under the action, water erosion is prone to occur in the anchorage area of ​​the lower anchor end of the suspender, and long-term water erosion will cause corrosion and fatigue of the anchor end structure, which may easily lead to breakage accidents of the suspender; It is difficult to check and maintain in the later stage, the danger is hidden and invisible, it is easy to cause damage without warning, there is a great potential safety hazard, and it is not convenient to replace the suspender

The concrete rigid suspenders of the concrete tie-rod arch bridge are equipped with fine-rolled threaded steel bars as prestressed steel bars, and the bearing load is low. The steel bars are corroded, seriously affecting the operational safety and service life of the bridge

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