Protective structure and a protective construction method of an existing roadbed in culvert extension construction

Abstract

The invention discloses a protective structure of an existing roadbed in culvert extension construction, which comprises an existing culvert body, The two sides of the entrance and exit are the existing roadbed slopes, and Larsen steel sheet piles are continuously driven into the roadbed slopes. The plane formed by the Larsen steel sheet piles is at an angle of 45 degrees to the central axis of the existing culvert. The starting end of the continuous Larsen steel sheet piles is 3.5 m away from the centerline of the existing line, and the end is located at the foot of the roadbed slopes. The protective structure disclosed by the invention has strong adaptability and good protective safety performance, has low construction cost and short construction period.

Description

technical field [0001] The invention relates to the field of railway construction, in particular to a protective structure and a protective construction method for an existing subgrade in the construction of culverts adjacent to railway business lines. Background technique [0002] With the rapid development of economy and society, the passenger and freight volume of railways has also increased significantly. The shortcomings of existing lines such as low operating speed, poor transportation quality, and small line transportation capacity have become increasingly prominent. The transportation capacity of a large part of existing railways has not adapted to transportation growth. needs. Therefore, in order to improve the transportation capacity of the existing railway, it must be expanded and transformed. The capacity expansion and transformation of existing lines mainly include speeding up existing lines, adding a second line to expand capacity and speed up, and building ne...

AI Technical Summary

Problems solved by technology

[0004] General protective measures adopt methods such as manual digging piles, rotary drilling piles, rail piles, and I-beams. Among them, manual digging piles and rotary drilling piles are likely to cause hole collapse accidents during construction, and the construction period is long, and the project cost It is high and has a great impact on railway traffic; rail piles and I-shaped steel piles have poor anti-dynamic load interference capabilities, and the strength of the pile body is low, making it difficult to ensure the stability of the existing roadbed, which affects the operation safety of the business line, etc.

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