Zero spacing construction method at the intersection of the upper and lower main tunnels of the underground interchange
A construction method and technology for the main tunnel, applied in the direction of tunnels, tunnel linings, underground chambers, etc., to reduce the surface subsidence and avoid the impact
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[0019] refer to Figure 1 to Figure 2 Examples of the present invention will be described.
[0020] The invention provides a zero-spacing construction method at the intersection and overlap of the upper and lower main tunnels of an underground overpass.
[0021] Embodiments of the present invention are described below.
[0022] 1. Construction of the upper tunnel with 4 construction methods: the small conduit 1 for advance grouting in the upper tunnel is used for advance grouting and support, and then press figure 2 In the order of ①, ②, ③, and ④, the soil is excavated in sections, and the upper tunnel initial support 2 and the upper tunnel CRD construction method temporary steel support 15 are applied. It is used as the initial support of the upper layer tunnel to strengthen the reinforced concrete beam 6 and the longitudinal I-beam of the arch foot of the upper layer tunnel and the anchor rod 16 of the locking foot.
[0023] 2. Construction of the upper tunnel secondary ...
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