Steel truss bridge closure jacking-drawing device

Abstract

The utility model relates to a top pull device for closing a steel truss bridge, which relates to a top pull device for adjusting the distance between components on both sides of a closing mouth of a steel truss bridge when the bridge is closed in the middle of the span. It is composed of a top pull seat and a support seat. Both sides of the top pull seat are provided with a top surface and a tension surface. There is a mounting hole for the support seat in the middle, and a high-strength bolt hole is provided at one end. Strength bolt holes. When the steel truss bridge needs to be closed, the top tension seat and the support seat are respectively installed on the chord members on both sides of the closing mouth through high-strength bolts. First, measure whether the distance between the closing rods on both sides of the closing mouth is less than or greater than the theoretical distance required for closing , to determine whether the present invention is installed in the top position state or the pull position state. After the jacking or pulling is carried out by the present invention, the distance of the closing mouth reaches the required theoretical distance, and then the smooth closing of the rods is realized. The quantity of top pull seat and supporting seat of the present invention is determined by the size of the required top pull force of closing. The present invention has been tried successfully in Wanzhou Yangtze River Bridge on Yiwan Railway.

Description

technical field [0001] The invention relates to a steel truss bridge mid-span closing dragon top pulling device. Background technique [0002] For steel truss bridges in railways, highways, and municipal engineering, when the installation method of mid-span closure is adopted, the distance between the rods on both sides of the closure mouth before closure is not necessarily the required theoretical distance, and the distance between the members on both sides of the closure mouth before closure is not necessarily the required theoretical distance. Adjust the closing rods on both sides of the closing mouth, so that the distance between the closing rods on both sides can reach the required theoretical distance, so as to meet the closing requirements, and finally achieve a smooth closing. When the steel truss bridge is closed, the horizontal relative displacement ΔX between the chords on both sides of the closing mouth can generally be adjusted by means of the overall lifting of...

AI Technical Summary

Problems solved by technology

When the steel truss bridge is closed, the horizontal relative displacement ΔX between the chords on both sides of the closing mouth can generally be adjusted by means of the overall lifting of the beam body or temperature expansion and contraction adjustment, but when the displacement that needs to be adjusted is not large, the beam body The overall top-down seems to be difficult to operate and difficult to control, and the method of temperature expansion and adjustment is also affected by weather conditions (mainly temperature)

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