Reinforcement construction method with soft foundation grouting in railway frame bridge jacking process

Abstract

The invention discloses a reinforcement construction method with soft foundation grouting in a railway frame bridge jacking process. The method comprises the following steps of: reinforcing soft foundations positioned below station tracks on the two sides of a frame bridge to be jacked on a station yard and a main station track in the middle of the frame bridge by virtue of a slant pouring method; and reinforcing soft foundations positioned below branch station tracks in the middle of the station yard by virtue of a direct pouring method. In the railway frame bridge jacking process, the slant pouring method and the direct pouring method are combined for reinforcing the soft foundations under the railway frame bridge below the multiple station tracks; as the speed of vertical pouring is high, the time for reinforcing each station track is only about 48 hours, so that the construction period can be shortened substantially; and thus the reinforcement construction method is applicable to electrified railway construction, and causes least interference on the normal operation of a railway line.

Description

technical field [0001] The invention belongs to the technical field of railway construction, in particular to a soft foundation grouting reinforcement construction method during the jacking process of a railway frame bridge. Background technique [0002] With the rapid development of urban and rural construction, the number of cars is increasing year by year, so the existing roads can no longer meet the traffic requirements, so sometimes it is necessary to lay frame bridges under some existing railway lines, or replace the existing old frames The bridge was replaced with a new frame bridge to facilitate the passage of vehicles. At present, the method of replacing the old frame bridge with a new frame bridge under the existing railway line usually adopts the jacking method. In this method, the soft soil foundation at the lower part of the old frame bridge is first reinforced by grouting, and at the same time, the upper part of the frame bridge is reinforced. The existing rai...

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Problems solved by technology

However, this construction method has the following problems: when the frame bridge is located under the existing railway line outside the station yard, the existing railway line has at most 6 strands, so the oblique grouting from both sides of the existing railway line is usually used The method can meet the requirements of soft soil foundation reinforcement under the existing railway line. However, when the frame bridge is located under the station line, since the line at the station has more than ten strands, if the oblique direction is simply adopted from the outside of the line, The grouting method cannot reinforce the soft soil foundation under the strand road in the middle part

In addition, the oblique grouting method uses an auger drilling rig to drill holes obliquely and then grouting. Although the vibration of this drilling rig is small, the impact on the existing railway line is small, but because the distance between the strands in the middle is small , so if the oblique grouting method is still used, it will be difficult to operate, especially the oblique grouting method is slow in construction speed, so it leads to a long construction period, which is not allowed in railway construction

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