Combined type pre-stressed cable pipeline positioning mesh and construction method

Abstract

The invention discloses a combined type pre-stressed cable pipeline positioning mesh. A positioning mesh is an FRP (Fiber Reinforced Polymer) positioning mesh and comprises an FRP bottom plate cable pipeline positioning mesh, an FRP web plate cable pipeline positioning mesh and an FRP top plate cable pipeline positioning mesh; a U-shaped upper supporting ring rib is arranged under the supporting position of the FRP positioning mesh, an inverted U-shaped lower pressing ring rib is arranged above the supporting position of the FRP positioning mesh, and a steel cable pipeline penetrates through a closed ring structure formed by the U-shaped upper supporting ring rib and the inverted U-shaped lower pressing ring rib; the FRP positioning mesh is supported through erection bars. The invention also provides a construction method of the combined type pre-stressed cable pipeline positioning mesh. The method comprises the steps of manufacturing the FRP positioning mesh in a factory through a detailed drawing, and fixedly arranging the U-shaped upper supporting ring rib and the erection bars on the FRP positioning mesh; sequentially installing the FRP bottom plate cable pipeline positioning mesh, the FRP web plate cable pipeline positioning mesh and the FRP top plate cable pipeline positioning mesh. The invention has the beneficial effects that the positioning accuracy of the steel cable pipeline can be increased, a pipeline can be prevented from being damaged by welding ignition, and the stress of the pipeline is uniform.

Description

technical field [0001] The invention relates to the technical field of civil engineering bridges, in particular to a combined prestressed cable pipeline positioning network and a construction method thereof. Background technique [0002] Long-span prestressed concrete box girder bridges are currently widely used bridge types, and continuous beam and continuous rigid frame bridges are the most common. The negative bending moment steel cables are arranged longitudinally and horizontally in the roof, and generally the cross-sections of the roof cables are arranged in one or more rows. The web cables are longitudinally bent and arranged inside the web, and generally the cross-sections of each web are arranged in a row. The bottom plate cables are arranged longitudinally in the bottom plate, and generally the cross sections are arranged in a row. [0003] In the prior art, galvanized iron corrugated pipes or high-density polyethylene (HDPE) double-walled corrugated pipes are of...

AI Technical Summary

Problems solved by technology

[0006] (1) The positioning network of the pipeline adopts a single positioning installation made on site, and each pipeline has the possibility of construction deviation, and the construction control is difficult, which often leads to large dispersion of pipeline deviation

[0007] (2) The positioning net materials are all made of steel bars, which are easy to burn and damage the pipeline during welding construction. The problem is more serious when iron pipelines are used, which will cause grout to block the pipeline when pouring concrete

[0008] (3) The pipes are spot-welded to fix each pipe on the roof, web and bottom structural steel bars through U-shaped steel bars. When the erecting steel bars are less or unreliable, the deformation of the structural steel bars during pouring concrete will cause large deviations in the pipelines , exceeding the specification limit

[0009] (4) The positioning net is all made of steel bars and has a large dead weight

[0010] (5) On-site stakeout, accurate positioning of pipeline construction is difficult

[0011] (6) The mesh is not integrated, which often leads to inaccurate positioning of the pipeline, resulting in increased prestress loss, and the additional force of the pipeline deviating from the tensile prestress will cause structural cracks and other diseases, affecting structural durability

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