Zero spacing construction method for overlapping part of upper main tunnel and lower main tunnel of underground overpass

Abstract

The invention discloses a zero spacing construction technical method for an intersecting and overlapping part of an upper main tunnel and a lower main tunnel of an underground overpass, which belongs to construction technologies of tunnel engineering. The method comprises four procedure steps of: (1) excavating and supporting an upper-layer tunnel CRD (cross diaphragm) and strengthening the construction of reinforced concrete edge beams; (2) excavating and supporting a base pit of a lower-layer tunnel; (3) carrying out secondary lining construction outside the lower-layer tunnel; and (4) refilling the upper part of the secondary lining outside the lower-layer tunnel. The invention realizes the technical method which does not retain soil mass at the intersecting and overlapping part of the upper-layer main tunnel and the lower-layer main tunnel of the underground overpass and finishes the construction of the excavation and the support structure of the upper main tunnel and the lower main tunnel of an intersecting section in one step and solves the problems of structure influence to early built tunnel by the late built tunnel and the secondary disturbance to the ambient soil mass which are caused by the upper penetration or lower penetration due to the early and late construction of the upper main tunnel and the lower main tunnel.

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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