Subway track bed reinforcement construction process

Abstract

A subway track bed reinforcement construction process includes: first, forming holes; second, driving in anchor bolts; third, performing mechanical anchor locking; and fourth, grouting. By the process, the problem that the track bed is raised by pressure during grouting is solved, and deformation of the track bed subjected to grouting reinforcement is relieved. The construction process integrally combines anchoring and grouting, so that drilling and bar planting prior to drilling and grouting is avoided, the construction process is simplified, construction time is shortened, and construction effect is guaranteed.

Description

technical field [0001] The invention relates to a subway construction technology, in particular to a subway track bed reinforcement construction technology. Background technique [0002] During the operation of the underground railway, due to the long-term influence of the temperature difference, groundwater and dynamic load of the train, the underground railway will cause mud and sand to emerge from the ballast bed. The mechanical properties of the structure of the ballast bed part, on the other hand, change the stress state and need to be reinforced. At present, the grouting process is mainly used to fill and reinforce the gaps between the backfill concrete on the ballast surface, the secondary lining, and the primary support. During the grouting process, in order to make the gap grouting full and bonded, the grouting must reach a certain pressure, use the pressure grout to drive away the water in the gap, and fill the gap to make it bonded to form a whole. However, whe...

AI Technical Summary

Problems solved by technology

However, when the gap between the backfill concrete on the surface of the ballast bed and the secondary lining or between the secondary lining and the primary branch is as long as tens to tens of meters, or even hundreds of meters, after the grout is poured in, the ballast bed is likely to be completely crushed under the action of grouting pressure. When jacking up, the gap between the ballast bed and the second lining or between the second lining and the primary branch becomes larger, resulting in a large increase in the amount of slurry poured in. After the slurry material is solidified, it is stacked layer by layer, and the ballast bed is lifted too much, resulting in the overall deformation of the track bed. Will endanger the safety of subway operations

[0003] The current patent 03113804.7 discloses a combination of grouting and planting bars. In the construction process of this process, the bars are first planted and then drilled for grouting. It takes more than half an hour to grout after planting bars, and the number of drilled holes increases, resulting in The construction process is complicated, and the reinforcement of the subway takes only 2 to 4 hours at night. Therefore, a relatively simple and fast construction process for the reinforcement of the ballast bed is needed