| 摘要 |
A construction method for an intermediate support of a double-track tunnel is provided to make construction simple and to reduce the cost required for construction and maintenance by excluding the necessity for constructing a pilot tunnel for installing an intermediate support and to secure stability by preventing the transfer of impact and vibration caused by blasting or crushing work of a main tunnel. The construction method for an intermediate support of a double-track tunnel comprises the steps of forming a perforated hole(11) to a foundation layer(101) located on the lower part of a double-track tunnel by perforating the center of a stratum(100) between double-track tunnels using an auger screw(12)(S11), placing foundation mortar(13) up to the height corresponding to one third of the length of the perforated hole from the lower part of the perforated hole to have foundation-bearing capacity(S12), inserting a pile(14) to the perforated hole filled with foundation mortar(S13), placing support mortar(15) on the circumference of the pile inserted to the perforated hole to secure friction bearing capacity(S14), and hardening the foundation mortar and the support mortar(S15).
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