Temporary bridge covered excavation method for constructing box culvert below traffic ground line of operating track

Abstract

The invention discloses a temporary bridge covered excavation method for constructing a box culvert below a traffic ground line of an operating track, which comprises the following steps of: constructing supporting piles and pile top beams at two sides of the existing line, temporarily removing the line, and constructing prestressed concrete box type beams on the top beams to form a temporary bridge supporting system to be used as a temporary supporting structure of the line; and then, recovering the line, excavating soil bodies at the lower part step by step under the protection of the temporary bridge supporting system, and casting the box culvert structure in the field section by section. In the construction process of the box culvert, stress conversion of the supporting piles needs to be carried out, partial supporting piles are removed to enable the box culvert to become the supporting structure of the line, and the top beams and the constructing prestressed concrete box type beams are reserved for the permanent supporting structure of the line, thereby reducing the influence of construction on the operation of the traffic line of the existing track.

Description

technical field [0001] The invention relates to the field of municipal engineering, in particular to a construction method for covering and excavating a convenient bridge for building a box culvert under a ground line of an operating rail transit. Background technique [0002] With the large-scale development of urban rail transit and the development and construction of municipal facilities, there are currently many roads and operating rail transit lines that need to be built under the box culvert. During the construction of the box culvert, the surrounding soil will inevitably be disturbed, and then It affects the track structure and train speed on the operating line, and even endangers the safety of the train. With the network development of rail transit lines, the speed limit or suspension of trains that may be caused by the construction of box culverts will have a greater impact. Therefore, it is necessary to study more reasonable construction methods and control measure...

AI Technical Summary

Problems solved by technology

[0005] 2. The cover system of cover excavation is usually used as a temporary road surface. After the construction of the underground structure is completed, it needs to be dismantled and then restored to the original road surface, causing secondary interference to ground traffic, which has a great impact on rail transit lines

[0006] 3. The load-bearing system of longitudinal and horizontal beams is complex. Sometimes it is necessary to set up multiple horizontal supports and temporary columns when excavating foundation pits, which is not conducive to the construction of box culverts

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