Construction process for using bridge girder erection machine to remove T-shaped cantilever continuous rigid frame box girders

Abstract

The invention discloses a construction process for using bridge girder erection machines to remove T-shaped cantilever continuous rigid frame box girders. The process is characterized by including the steps of A, mounting the bridge girder erection machines; B, performing trial hanging by the bridge girder erection machine; C, drilling and cutting; D, removing girder sections; E, chiseling girder sections; F, transversely moving the bridge girder erection machine; and G, removing the bridge girder erection machines; wherein the removing equipment includes two 50m-span bridge girder erection machines, and girder turning is achieved by modifying hanging hooks of the bridge girder erection machines; the bridge girder erection machines are heightened by adding Berea groups and pouring concrete strip foundation below support legs of the bridge girder erection machines to realize that the removed girders are delivered out between two main trusses of the bridge girder erection machines through a bridge face. All girder section removing includes girder section prehanging, girder section cutting, girder section turning, girder section transferring, and girder section chiseling. The construction process is low in used equipment, short in construction period, and small in influence on the society, box girders are removed safely while cost is saved a lot and normal operation of channels or passages below a bridge is unaffected, and safe and environment-friendly T-shaped cantilever continuous rigid frame box girder removing is achieved.

Description

technical field [0001] The invention relates to a construction method for dismantling old bridge box girders, in particular to a construction technique for dismantling T-shaped cantilever continuous rigid frame box girders by using a bridge erecting machine. Background technique [0002] The box girder of the bridge is made by hanging baskets, which are prefabricated and assembled together; the width of the main bridge box girder roof is 11.5m on the left and 13.45m on the right; 4.8m changes in a quadratic parabola; the left width of the box girder bottom plate is 9.36m, and the right width is 11.16m; the width of the beam section from block 1 to block 11 is as follows: 1.8m, 2m, 2.4m, 2.4m, 2.4 m, 2.4m, 2.8m, 2.8m, 2.8m, 2.5m, 1.68m. The height of the box girder increases from 1.8m in the 11# block to 4.8m in the 1# according to the quadratic parabola. The thickness of the bridge deck pavement layer is 8cm. The thickness of the girder section of the box girder is relati...

AI Technical Summary

Problems solved by technology

The height from the track to the bridge deck of the existing bridge erecting machine is generally 3.5 meters, which cannot complete the transportation of the T-shaped cantilever continuous rigid frame box girder from the bridge deck

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