A method for continuous girder bridge with multiple spans for overweight vehicles

Abstract

The invention relates to a method for an extra heavy-loaded vehicle to cross a multi-span continuous beam bridge. The method includes the following steps that a, steel oblique cushion blocks, auxiliary steel boxes, rubber cushion blocks, bridge crossing steel boxes and steel cushion beams are prepared; b, before the extra heavy-loaded vehicle crosses the bridge, traffic is interrupted, and the steel cushion beams are laid on a bridge floor at intervals in the width direction of the beam bridge; c, two lines of the continuous bridge crossing steel boxes are erected on the steel cushion beams inthe length direction of the beam bridge; d, the auxiliary steel boxes are laid on the bridge crossing steel boxes at intervals, and the rubber cushion blocks are placed between the bridge crossing steel boxes and the auxiliary steel boxes; e, the steel oblique cushion blocks are connected with the bridge crossing steel boxes and the auxiliary steel boxes in an obliquely-erected mode, and the bridge crossing steel boxes, the auxiliary steel boxes and the steel oblique cushion blocks form two routes for the extra heavy-loaded vehicle to pass; and f, the extra heavy-loaded vehicle crosses the beam bridge at a low speed, and after the extra heavy-loaded vehicle crosses the beam bridge, the steel oblique cushion blocks, the auxiliary steel boxes, the rubber cushion blocks, the bridge crossingsteel boxes and the steel cushion beams are detached, and normal traffic is recovered. The method is low in cost and convenient to construct. The invention relates to the technical field of bridge engineering.

Description

technical field [0001] The invention relates to the technical field of bridge engineering, in particular to a method for an overweight vehicle multi-span continuous girder bridge. Background technique [0002] With the development of economy and transportation, some overweight vehicles have the demand to pass through continuous girder bridges. However, due to the heavy load of overweight vehicles, the ultimate bending capacity of the main girder of continuous girder bridges is difficult to pass through. Passage is only allowed after the ultimate bending capacity is reached. In view of the above problems, the reinforcement method that can be used for reference at present, as disclosed in the patent CN104652293A: a cable-stayed bridge structure and construction method for strengthening PSC continuous girder bridge, is to reduce the internal stress of the main girder by changing the continuous girder bridge structure system , improve the bearing capacity, change the continuou...

AI Technical Summary

Problems solved by technology

[0003] (1) Due to the complex structure, many times of assembly and welding are required, resulting in relatively poor structural reliability, and the structure is all composed of steel structures, with poor durability and high construction technology requirements

[0004] (2) Due to the complex stress of the unequal-span continuous girder bridge, it is necessary to adjust the force of the cables many times, and the design and construction technology requirements are high

[0005] (3) This reinforcement method directly anchors the composite steel on the vertical prestressed tendons of the web of the unequal-span continuous girder bridge, which will cause the vertical prestressed tendons to produce too large a local area of ​​the web of the unequal-span continuous girder bridge. Compressive stress, which adversely affects the beam body and causes local damage

[0006] (4) The construction procedures are cumbersome, the construction period is long, and the traffic needs to be closed for a long time for construction

[0007] (5) The overweight vehicle crossing the bridge is a temporary behavior, while the reinforced structure of this invention is a permanent structure, which loses its use value after the overweight vehicle crosses the bridge, resulting in great economic waste

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