Method for dismantling pier and bearing platform at lower part of river-crossing bridge

Abstract

The invention discloses a method for dismantling a pier and a bearing platform at the lower part of a river-crossing bridge. A pier and a bearing platform connected below the pier are involved. The method mainly comprises the following steps: (1) designing and dismantling the bearing platform on a mud flat or not in the range of a navigation hole together with the pier; (2) determining horizontaland vertical cutting positions of the pier; (3) erecting an operation platform, and cutting the pier into blocks; (4) vertically dividing the bearing platform; and (5) determining the elevation of a pile foundation cutting line under the bearing platform, carrying out cutting operation, and lifting the pile foundation away from part of the connected bearing platform. According to the method, the pier and the bearing platform which are located at the non-navigation hole or the mud flat are jointly designed and dismantled, and part of the pile foundation is cut during dismantling, so that the pile foundation is located under a riverbed or the ground; through vertical equal cutting of the pier and vertical cutting of the horizontal plane, hoisting is facilitated; and the pile foundation is cut, and in the cutting process, a vertical pipe fixed through an upper fixing hoop and a lower fixing hoop is connected with a rope saw in a penetrating mode, and the cutting accuracy of the rope saw is guaranteed.

Description

technical field [0001] The invention relates to the field of bridge dismantling and construction, in particular to a method for dismantling the lower piers and caps of bridges across rivers. Background technique [0002] With the continuous extension of bridge construction, some bridges that cannot meet the upper load and regional planning will be demolished, and some old and dangerous bridges will also be demolished and replaced for safety reasons. In the demolition of bridges, there are few construction methods for the lower piers and caps of bridges across rivers, especially when the piers and caps are in non-navigable holes or tidal flats, there is a lack of targeted scheme design; and for non-navigable holes or tidal flats The piers and caps at the bridges are not easy to chisel out, and the cutting, removal and hoisting increases the difficulty of implementation. Therefore, it is necessary to provide a method for removing the piers and caps at the lower part of the bri...

AI Technical Summary

Problems solved by technology

[0003] The invention provides a method for dismantling the lower piers and caps of cross-river bridges, which is used to solve the problem of determining the cutting plan of piers and caps at non-navigable holes or tidal flats of cross-river bridges, the implementation of hoisting schemes, and the bearings with pile foundations. Technical issues such as platform cutting and seam construction

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