A large-scale box jacking control construction method that can improve precision

Abstract

The invention discloses a large-sized box jacking control construction method capable of enhancing accuracy. The construction method comprises the following steps of: arranging a plurality of cement stirring piles into a foundation pit on one side of a railway on which a frame bridge is required to be paved; reinforcing a subgrade soil body below the railway with cement water glass slurry to enhance the bearing force of a foundation; jacking a large-sized box towards the lower side of the railway by using jacking equipment; and preventing the large-sized box from being subjected to phenomena such as deviation, head tying or head raising and the like by different measures. By adopting the method, the positioning accuracy of the large-sized box can be ensured, good engineering quality and high safety are achieved, and normal operation of the existing railway is not obstructed.

Description

technical field [0001] The invention belongs to the field of railway bridge and culvert construction, and in particular relates to a large box body jacking control construction method capable of improving precision. technical background [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 for the passage of vehicles. Frame bridges are usually composed of more than one large boxes connected end to end. However, such a situation is often encountered during the construction of frame bridges: due to the low bearing capacity of the foundation where the frame bridge is to be installed, and the relatively large weight of the large box, the large box is very heavy during the jacking process. Phenomena such as pinching and collapse on both sides are prone to occur, resulti...

AI Technical Summary

Problems solved by technology

However, such a situation is often encountered during the construction of frame bridges: due to the low bearing capacity of the foundation where the frame bridge is to be installed, and the relatively large weight of the large box, the large box is very heavy during the jacking process. Phenomena such as pinching and collapse on both sides are prone to occur, resulting in the design elevation of the frame bridge being difficult to control, so there will be a certain deviation between the frame bridge after it is in place and the design, which will seriously affect the quality of the project, and to a certain extent It will also affect the safety of the train

In addition, when the existing railway line obliquely intersects with the longitudinal centerline of the frame bridge, it is difficult to control the jacking direction

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