Zero spacing construction method at the intersection of the upper and lower main tunnels of the underground interchange

Abstract

The invention discloses a zero-space construction method at the intersection and overlap of the upper and lower main tunnels of an underground overpass, which belongs to the tunnel engineering construction technology. Contains four major process steps: ①CRD excavation and support of the upper tunnel, and construction of reinforced concrete side beams; ②Excavation and support of the foundation pit of the lower tunnel; ③Secondary lining construction outside the lower tunnel; ④External lining of the lower tunnel Backfilling of the upper part of the secondary lining. The invention realizes the technical method that no soil body is left at the intersection and overlap of the upper and lower main tunnels of the underground interchange, and the excavation of the upper and lower main tunnels in the intersection section and the supporting structure are completed in one operation. It solves the influence of the later built tunnel on the structure of the first built tunnel and the secondary disturbance to the surrounding soil caused by the upper or lower passage caused by the successive construction of the upper and lower main tunnels.

Description

technical field [0001] The invention belongs to the tunnel engineering construction technology, in particular to a construction technology method with zero spacing at the intersection and overlap of the upper and lower main tunnels of an underground overpass. Background technique [0002] With the rapid increase of the number of urban vehicles, the limited road resources on the urban ground cannot meet the needs more and more, so serious traffic congestion occurs. This phenomenon has been experienced in major cities around the world. While people are paying close attention to the construction of urban subways and vigorously advocating public transportation, some major cities in the world have also begun to pay attention to the construction of underground roads and put them into practice. After the highway was dismantled, it was moved underground to form an underground two-way 10-car expressway; the central circular Shinjuku Line in Tokyo, Japan, with a length of 11 kilomete...

AI Technical Summary

Problems solved by technology

However, with the large-scale construction of the underground road network, there will inevitably be spatial intersections between underground roads (that is, tunnels)

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