Manufacture method for prestress steel-concrete combined bridge

Abstract

The invention relates to a manufacture method for a prestress steel-concrete combined bridge, comprising the steps of: computing a position most disadvantageous to live load and the size of the live load at the position according to a positive bending moment influence line of fulcrum of a steel girder; casting positive bending moment area concrete in the positive bending moment area of the steel girder; placing pre-compression counterweight on the positive bending moment area concrete, wherein position and size of the pre-compression counterweight are same as those of the live load at the most disadvantageous position; casting steel fiber expansion concrete at the negative bending moment area; and detaching the pre-compression counterweight after the steel fiber expansion concrete reacheshardening strength. A connecting piece at the top of the steel girder comprises a rigid combination connecting piece, a flexible combination connecting piece or a non-combination connecting piece, and an elastic combination connecting piece. According to the manufacture method for the prestress steel-concrete combined bridge, disclosed by the invention, the pre-compression counterweight is quantitatively and accurately distributed on the positive bending moment area concrete according to the most disadvantageous position and the size of the live load, the positive bending moment is obtained at the fulcrum; pressure stress is obtained by the concrete on the steel girder, so that the storage of the bridge can counteract the pre-load of the live load.

Description

[0001] technical field [0002] The invention relates to the field of supporting beam structures in roads, bridges and buildings, in particular to a method for manufacturing a prestressed steel-concrete composite bridge. [0003] Background technique [0004] The steel-concrete composite structure not only has the advantages of giving full play to the advantages of material mechanics, fatigue resistance, good ductility, good stability, and reduced impact coefficient, but also has the advantages of convenient construction, low cost, and good comprehensive benefits. It is light, high-strength, and large. Cross, environmental protection, economical, beautiful. [0005] The steel-concrete composite girder bridge has a positive bending moment at the middle span, the concrete is under compression and the steel plate is under tension, giving full play to the advantages of material mechanics; however, at the fulcrum, the section has a large negative bending moment, and the concrete...

AI Technical Summary

Problems solved by technology

The Chinese invention patent with the application number 200410062215.2 proposes a method of adding preload to control the tensile stress during bridge construction, but it does not clearly propose a specific method to adjust the preload accurately, and lacks a specific method to solve the problem. As a result, the efficiency of bending moment amplitude modulation is not high, especially for multi-span continuous beams, construction loading has a certain degree of blindness and randomness, and does not exert the effect of affecting line loading bending moment amplitude modulation

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