Comprehensive supporting system for downward penetration of important pipeline in underground excavation passage, and construction method for comprehensive supporting system

Abstract

The invention relates to a comprehensive supporting system for the downward penetration of an important pipeline in an underground excavation passage, and a construction method for the comprehensive supporting system. The supporting system comprises a raising segment and a standard segment, wherein the top of the raising segment is higher than the top of the standard segment, and the section of the raising segment is greater than the section of the standard segment; the raising segment and the standard segment independently comprise a preliminary-stage supporting structure and a secondary lining structure, a temporary supporting structure is internally arranged, and an advanced supporting structure is arranged on the top and comprises slip casting small guide pipes and multiple pieces of groove steel; and multiple pieces of groove steel are of semi-enclosed hollow cuboid structures which are longitudinally in one-forward and one-reverse inner-biting type lap joint, the end parts of thegroove steel are welded into a whole, and the slip casting small guide pipes are positioned in groove steel notches. Under a situation that an underground excavation pipeline is next to a high-risk source pipeline, the own structural safety of an existing pipeline and the own structural safety of a new underground excavation pipeline can be guaranteed, and meanwhile, a construction working procedure is simple. Compared with other supporting materials, the comprehensive supporting system has high cost performance and has a small influence on a construction progress.

Description

technical field [0001] The invention relates to the technical field of underground space engineering construction, in particular to a comprehensive support system and a construction method for an underground passage passing through an important pipeline. Background technique [0002] With the development needs of the urban modernization process, underground space comprehensive development projects such as underground passages have played an important role. The construction area is often located in the center of the city, with heavy traffic on the ground and intricate existing pipelines underground. The main types include: water supply, rainwater, sewage, gas, heat, electricity, etc. The safety requirements of underground engineering are very high. Both the project itself and the surrounding risk sources must be controllable, and the construction is relatively complicated. In particular, the long-buried rainwater and sewage pipelines passed under the underground excavation c...

AI Technical Summary

Problems solved by technology

The safety requirements of underground engineering are very high. Both the project itself and the surrounding risk sources must be controllable, and the construction is relatively complicated.

In particular, the long-buried rainwater and sewage pipelines passed under the underground excavation channel. Due to long-term disrepair and rough early construction technology, water leakage has occurred in many parts of the pipeline. The long-term water leakage has caused the surrounding soil to Softening can easily lead to landslides during channel excavation, so special support measures must be taken when tunnels are excavated under such high-risk sources

The traditional advanced small conduit grouting, advanced bolting, and freezing methods are not suitable for such water-rich formations that are adjacent to the existing important pipelines

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