Construction method of jacking for super-heavy frame bridge in special geology

Abstract

Disclosed is a construction method for jacking of an overweight frame bridge at special geology. The construction method comprises the steps that a protective pile and a back pile are arranged; a foundation pit is excavated, and sliding plates with a plurality of longitudinal and transverse anchor beams on the bottom faces are manufactured; lubricating layers are constructed on the surfaces of thesliding plates; a back wall is arranged; a box is prefabricated; and jacking iron and a jack are arranged for jacking the box. The construction method has the effects that under the situation of overall jacking, the friction coefficients between the box and the sliding plates as well as between the box and a soil body are decreased, so that the overall jacking force of the box is decreased, meanwhile, series of measures control over the arrangement levelness and direction of the jacking iron are added, so that the overweight box is jacked in place smoothly, and safety is good; the position ofthe jacking iron is controlled through an infrared gradienter so as to ensure the accuracy of the position of the jacking iron; and through the construction method, the construction period can be shortened, the influence on the safety of a railway is reduced, and the jacking precision is improved.

Description

technical field [0001] The invention belongs to the technical field of reconstruction and construction of existing railway lines, and in particular relates to a jacking construction method of a special geological overweight frame bridge. Background technique [0002] With the rapid development of social economy, currently in the reconstruction of existing railway lines, it is necessary to change a large number of level crossings and new underpass railway roads into overpass frame bridges. In order to reduce the impact of construction on the traffic and transportation of existing lines, these Frame bridges are generally constructed using the jacking method. The jacking method has the characteristics of less investment, short construction period, and short impact on railway operation, but it also has relatively large safety hazards. [0003] In the past, the jacking construction usually used the relay room, that is, the front section was first jacked, the rear section was fol...

AI Technical Summary

Problems solved by technology

Adopting the jacking method for construction has the characteristics of less investment, short construction period, and short impact on railway operation, but it also has relatively large safety hazards

[0003] In the past, the jacking construction usually used the relay room, that is, jacking the front section first, following up the rear section, and finally jacking into place. However, this construction method has a long construction period and has a long time to affect the safety of railway operation. The safety pressure is high, especially for the jacking construction of large frame bridges with many lines crossing, heavy weight, and under special geological conditions. Due to the tight construction period, if jacking between relays is used, the task will not be completed on schedule, thus It affects the normal construction of the next step. At the same time, the frame bridge is located on the fine sand geological layer and has no cohesion. It is extremely difficult to control the elevation change during the jacking process, making it difficult to guarantee the safety of the railway operation.

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