Construction method of urban tunnel branching port with box type top plate structure
A construction method and bifurcation technology, applied in mine/tunnel ventilation, tunnel, tunnel lining, etc., can solve problems such as ineffective reduction of covering soil thickness, large roof thickness and unreasonable structural form, etc. Achieve the effects of reducing the amount of ordinary steel bars, less construction difficulty, and easy design
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Embodiment 1
[0033] Such as Figure 1-6 The shown single-hole urban tunnel with a bifurcation consists of a bottom plate 10, a side wall 1 and a box-shaped roof according to the present invention. Specifically, the above-mentioned tunnel box-shaped roof includes an upper plate 2 and a lower plate 3 arranged at intervals, and the upper plate 2, the lower plate 3 and the tunnel side wall 1 enclose a cavity that extends longitudinally along the tunnel and whose cross section gradually increases; The end with the smaller cross-section of the cavity is provided with a main port end plate 4.1, and the other end is provided with a side beam 5, and according to the design requirements, two branch end plates 4.2 and 4.3 are extended outside the side beam 5, and the inside of the cavity is passed through The web 6 is divided into a plurality of chambers S arranged longitudinally. Formwork removal holes 7 are reserved on the upper plate 2 of each box room S, and waterproof mortar is used for the low...
Embodiment 2
[0044] In order to further improve the durability of the structural roof, reduce the amount of concrete and steel bars on the structural roof, and increase the span of the urban tunnel section to a greater extent, prestress can be set on the web 6 of the above-mentioned box-shaped roof, that is, on the web 6 The corrugated pipe channel is pre-embedded along the transverse direction of the tunnel, and the prestressed steel strand steel bundle 9 is penetrated in the corrugated pipe channel for prestressed tension.
[0045] Concrete construction steps are compared with embodiment 1, and difference is only in:
[0046] After the construction of the fourth step is completed, the corrugated pipe tunnel arranged along the transverse direction of the tunnel is pre-embedded in the web 6, and the prestressed steel strand steel bundle 9 is penetrated in the corrugated pipe tunnel; after that, when the concrete poured in the seventh step reaches After the design strength, tension and anch...
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