Apparatus and method for reinforcing roof of inclined-leg steel structure bridge

Abstract

The invention relates to the bridge reinforcement technology field, in particular to a slant-legged rigid frame bridge top support reinforcement device and a slant-legged rigid frame bridge top support reinforcement method. The slant-legged rigid frame bridge top support reinforcement device is formed by tensioning carbon fiber cloth strips between a fixed end base and a tensioning end base, wherein the fixed end base and the tensioning end base are of the same structure, and both formed by clamping clamp piece anchor tools through bottom plates and cover plates, each clamp piece anchor tool comprises a clamp piece bottom slice and a clamp piece cover slice, each clamp piece cover slice is in a shape of a semicircular table formed by cutting a circular table along the axis, clamp wings arearranged on positions, flat with the cutting face of the circular table, on two sides of each semicircular table, each cover plate is a strip bar with a rectangular cross section, each bottom plate can be divided into a fixing area and an anchor cup area in the short edge direction of each rectangular cross section, anchor cup grooves in a shape adaptive to the shape of each clamping clamp pieceanchor tool are formed in each anchor cup area at intervals, and the distance between each two adjacent anchor cup grooves is 2cm. The slant-legged rigid frame bridge top support reinforcement deviceadopts a composite reinforcement method for reinforcing a top support of a slant-legged rigid frame bridge, and then greatly improves bearing capacity and deformability of the bridge, and furthermoreimproves an effect generation delay defect existing in a traditional carbon fiber reinforcement method.

Description

technical field [0001] The invention relates to the technical field of bridge reinforcement, in particular to a device and method for reinforcing the roof of a steel structure bridge with inclined legs. Background technique [0002] Rigid-framed bridge with oblique legs refers to a bridge in which the span structure (main girder) and supports (diagonal legs) are connected obliquely as a whole. Under the action of vertical load, since the main beam and the oblique legs are rigidly connected, negative bending moments will be generated at the beam-column joints, thereby reducing the peak value of positive bending moments in the mid-span, and the cross-sectional dimensions of structural members can also be reduced accordingly . In addition, the oblique leg rigid frame bridge has the advantages of light and handy appearance, large clearance under the bridge, strong wind resistance, and can be constructed by cantilever construction method, and has been widely used in engineering....

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Problems solved by technology

The reinforcement method of enlarging the main arch section mainly uses reinforced concrete to thicken the arch rib section, so as to achieve the purpose of increasing the bearing capacity, but this method has the disadvantages of large amount of work, long working hours, and serious weight increase of the bridge body; The paste reinforcement method is to increase the bearing capacity of the bridge by pasting high-strength materials in the tension zone of the main arch ring, but this method has the phenomenon that the tension of the pasted materials is often delayed and the yield of the steel bars is often delayed, resulting in the reinforcement effect not being effective in time; change Structural force reinforcement method is a method to reduce the internal force of the main arch circle of the bridge by changing the force system of the bridge structure. Because of the need to change the bridge structure, the investment is often huge, and the amount of work and man-hours are more than other repair methods.

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