Cable-stayed reinforcing structure of double-way continuous rigid frame bridge and construction method thereof

Abstract

Disclosed are a cable-stayed reinforcing structure of a double-way continuous rigid frame bridge and a construction method thereof. The cable-stayed reinforcing structure comprises tower footing crossbeams which are arranged above the piers and between two ways of the double-way continuous rigid frame bridge, plastic corrugated pipes are buried in bottoms of the tower footing crossbeams, pre-stressed steel bars penetrate trough the plastic corrugated pipes internally, and two ends of the pre-stressed steel bars are fixed on inner webs after being extended; upright main towers are arranged in middles of the top faces of the tower footing crossbeams, cable saddles are pre-buried in the main towers; anchoring beams are arranged on two sides of the main towers and between the two ways of the double-way continuous rigid frame bridge symmetrically along a bridge direction at intervals, and cable holes are reserved in the anchoring beams; a first stay cable, a second stay cable, a third stay cable and a fourth stay cable are penetratingly arranged between the cable saddles and the corresponding cable holes and fixed on the anchoring beams after being extended. The cable-stayed reinforcing structure of the double-way continuous rigid frame bridge and the construction method have the advantages that the tower footing crossbeams are sufficient in rigidity, strength and anti-cracking ability, construction difficulty is lowered greatly, and construction period is shortened greatly.

Description

technical field [0001] The invention relates to the technical field of bridge engineering, in particular to a cable-stayed reinforcement structure of a double-width continuous rigid frame bridge and a construction method thereof. Background technique [0002] After a large number of continuous rigid frame bridges are put into use, some diseases often appear, and the more typical disease is that the side span and / or mid-span of the continuous rigid frame bridge have excessive deflection. [0003] At present, the reinforcement method for this type of bridge can be used for reference. As disclosed in Chinese patent CN102286938A, two new pile foundations are added for drilling and grouting on both sides of the original bridge pile foundation. The new pile foundation has the same structure as the original pile. The diameter of the pile is 2.4m, and the diameter of the lower pile is 2.0m. Connected to both sides of the original cap are new caps with planted reinforcement and circu...

AI Technical Summary

Problems solved by technology

[0005] (1) The tower height and pile diameter are too narrow to adapt to continuous rigid frame bridges with different spans and different degrees of disease;

[0006] (2) It is necessary to add pile foundations, caps and pier columns before erecting the bridge tower. The construction period of pile foundations, caps and pier columns is long and difficult, especially when the construction is in water and the pier is high, the cost is higher , more difficult;

[0007] (3) The joists need to be arranged at the bottom of the beams, and their length must be greater than the width of the bridge. Generally, the bridge width is more than 10 meters, or even more than 20 meters. The large self-weight brings a considerable burden to the stay cables;

[0008] (4) It cannot be well adapted to the reinforcement of double-width continuous rigid-frame bridges: for double-width continuous rigid-frame bridges, it is necessary to add 8 pile foundations, 4 caps, 4 pier columns, and 4 bridges at a single pier position Tower, the engineering volume will be very huge, as far as the whole bridge is concerned, it is even more

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