High-water-level silty-soil underneath-pass multi-track railway frame bridge jacking and butting construction method

Abstract

The invention discloses a high-water-level silty-soil underneath-pass multi-track railway frame bridge jacking and butting construction method. By respectively arranging waterproof curtains at a junction between a newly constructed frame and the existing frame in a direction along lines and in an area of 8 meters beyond the width of the newly constructed frame along a direction perpendicular to the lines, and by arranging a plurality of dewatering wells at intervals between two lines of a newly constructed line along the direction perpendicular to the lines, underground water level is effectively controlled. The lines are reinforced by taking measures of foundation reinforcement by using subgrade support piles, soil body reinforcing piles, existing pier fender piles and temporary beams. During frame jacking construction, jacking accuracy is guaranteed by taking measures such as firstly excavating a groove before earth excavation and then excavating earth from the bottom of the groove to the top of the bottom plate of a frame, jacking a sliding plate for elongation, setting jacking observation points and relieving load at the position of a pier when the sliding plate is jacked to the position of the pier. The high-water-level silty-soil underneath-pass multi-track railway frame bridge jacking and butting construction method has the advantages that the technical problem of great jacking construction difficulty under the situations of high water level, silty soil and multiple underneath-pass tracks is solved, the quantity of tracks of the lines reinforced by temporary beams is decreased and the influence on the lines is reduced.

Description

technical field [0001] The invention relates to a construction method for jacking and butt jointing of multi-strand railway frames, in particular to a construction method for jacking and butt jointing of multi-strand railway frames under high water level silt soil. Background technique [0002] For the construction method of multi-strand railway frame jacking and docking under the high-water level silt soil, the traditional method of water-stopping and precipitation is to connect the new frame and the existing frame as a whole, and the water-stop curtain runs through all the lines. There are many strands in the line reinforced by the middle beam, which has a great impact on the railway traffic, and it is difficult to ensure the safety of the line; in the jacking and docking construction of the railway frame under the railway, it is necessary to reinforce the railway line, and the general line reinforcement adopts the erection of the beam. method, for the situation that there...

AI Technical Summary

Problems solved by technology

[0002] For the construction method of multi-strand railway frame jacking and docking under the high-water level silt soil, the traditional method of water-stopping and precipitation is to connect the new frame and the existing frame as a whole, and the water-stop curtain runs through all the lines. There are many strands in the line reinforced by the middle beam, which has a great impact on the railway traffic, and it is difficult to ensure the safety of the line; in the jacking and docking construction of the railway frame under the railway, it is necessary to reinforce the railway line, and the general line reinforcement adopts the erection of the beam. method, for the situation that there are many tracks under the railway and the line reinforced by the beam is multi-track, a large number of maintenance personnel are usually required, and it is easy to cause changes in the line and affect the safety of traffic; during construction, the existing bridge piers are generally supported During the jacking process, the existing pier cap is only 57cm away from the box body, and the cap is prone to displacement changes. Many construction units adopt the method of adding observers to the existing pier when the frame is jacked up. If any changes are found, the construction of the pier will be stopped immediately. maintenance, but there are still some problems. First, changes in the line may affect driving safety; second, a large number of line maintenance personnel will be sent to increase construction costs; third, the stop of construction due to line changes will affect the construction efficiency and construction period

Images