The protection construction method based on the large rigid box culvert under the power pipe gallery

Abstract

The invention relates to a construction method for passing a rigid box culvert under a power pipe gallery, in particular to a protection construction method based on a large rigid box culvert passing under a power pipe gallery. Combined with a support protection device, firstly ensure that the soil directly under the box culvert without moving the body, excavate a long and narrow foundation pit on both sides of the box culvert, then excavate the foundation pit of the power pipe gallery and reinforce the soil outside the foundation pit and directly under the box culvert as the early support of the box culvert. The support and protection device outside the steel flower tube is to drill a hole between the bottom of the box culvert and the steel main beam to install the steel flower tube, and then start the jacking component, so that the tube shed component can effectively support the box culvert and provide medium-term support and protection for the box culvert; After the construction of the corridor is completed, the space directly under the box culvert is backfilled and reinforced by grouting with steel flower tubes to provide later support for the box culvert. The invention has the advantages of effectively protecting the large rigid box culvert, reducing disturbance to the foundation of the box culvert, ensuring backfill quality, convenient construction, effectively improving construction efficiency, shortening construction period, and reducing construction cost.

Description

technical field [0001] The invention relates to a construction method for passing a rigid box culvert under a power pipe gallery, in particular to a protection construction method based on a large rigid box culvert passing under a power pipe gallery. Background technique [0002] The urban power pipe gallery is an underground project, and the power pipe gallery often needs to pass through large rigid box culverts such as rainwater, sewage, and electricity during the construction process. At present, two methods are mainly used: one is to temporarily relocate the rigid box culvert, and then restore the box culvert after the construction of the power pipe gallery is completed; the other is to use trenchless pipe jacking operations, and use The pipe jacking machine jacks the rigid pipe culvert under the way. However, the disadvantages of the above scheme are: [0003] 1) Temporary relocation of large rigid box culverts requires relatively complex design and construction proje...

AI Technical Summary

Problems solved by technology

[0003] 1) Temporary relocation of large rigid box culverts requires relatively complex design and construction projects, long construction period, and great impact on the social scope of box culverts, so the practicability is not high;

[0004] 2) Trenchless pipe jacking requires large-scale pipe jacking machinery, which requires a lot of preparation before and after the project, high cost, and long construction period, and the pipe jacking machine has certain requirements on the properties of underground soil and rock, such as boulders, etc. , dealing with difficulties

However, the disadvantage of this solution is that it cannot effectively protect the rigid box culvert: firstly, it will cause a large area of ​​void under the box culvert, and cause a large disturbance to the foundation of the box culvert, making this section of rigid box culvert a potential safety hazard ; Secondly, no prestress is applied to the suspension steel bars, resulting in large deformation of the box culvert when the soil below the box culvert is excavated, and even cracks; Difficult to guarantee, resulting in serious settlement of large rigid box culverts in the later stage, even affecting line operation

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