Prestressed concrete variable cross-section box girder bridge, movable suspended scaffolding and construction method of prestressed concrete variable cross-section box girder bridge

Abstract

The invention provides a prestressed concrete variable cross-section box girder bridge. The prestressed concrete variable cross-section box girder bridge comprises a top plate, a bottom plate and webs, wherein the top plate, the bottom plate and the webs form a box girder box chamber. The prestressed concrete variable cross-section box girder bridge further comprises FRP box board composite structures, wherein the FRP box board composite structures are arranged on the lower surface of the top plate, the outer surface and inner surface of each web and the lower surface of the bottom plate. Each FRP box board composite structure comprises FRP plates and FRP box type stiffening ribs, wherein the FRP box type stiffening ribs are arranged between the two layers of FRP plates, and the FRP box type stiffening ribs and the two layers of FRP plates are bonded and cured to form the FRP box board composite structure. The stress performance and the crack resistance of a box girder are greatly improved, the phenomenon that the box girder cracks is reduced or even avoided, the structural integrity is improved, and therefore the quality and durability of the prestressed concrete variable cross-section box girder bridge are improved. The invention further provides a movable suspended scaffolding structure for the construction of the prestressed concrete variable cross-section box girder bridge and a construction method of the prestressed concrete variable cross-section box girder bridge.

Description

technical field [0001] The invention relates to the technical field of civil engineering bridges, more specifically, to a prestressed concrete variable-section box girder bridge, a hanging basket, and the bridge construction method. Background technique [0002] Long-span prestressed concrete variable-section box-girder bridges are widely used bridge types at present, and continuous beams and continuous rigid-frame bridges are the most common, and they are often constructed by hanging basket cantilever casting method. [0003] like Figure 1-Figure 4 As shown, it is a continuous rigid frame bridge. The top of the pier 06 is equipped with a pier top transverse diaphragm 08, and the pouring box girder 013 on the pier top includes block 0 and block 1, of which block 0 and block 1 are cast-in-situ using the pier top bracket, and the girder height is relatively large The pouring construction is divided into two times, the first pouring is carried out to the middle of the web, th...

AI Technical Summary

Problems solved by technology

The self-weight is relatively large, and each cantilever construction section needs to be equipped with necessary steel cables to overcome its excessive self-weight, so it is not economical

[0011] (3) In the prior art, there are many prestressed steel cables and anchors inside the roof 04 of the long-span prestressed concrete variable-section box girder bridge. Generally, there are certain micro-cracks in the concrete structure itself, so the waterproof effect of the general bridge deck is not good. Poor, often lead to corrosion of steel cables or anchors, seriously affecting the durability of the structure

[0014] (6) In the prior art, the age of the concrete of the box girder bridge constructed by the cantilever construction of the long-span prestressed concrete variable cross-section box girder is different at each stage, and the appearance and color of the concrete are generally inconsistent, which seriously affects the appearance of the concrete bridge

Using this closing method, when the piers on both sides are high, the risk is high, and the support cost is high, which is uneconomical

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