Underground tunnel section making system - leaves frozen gaps for dry excavation and ground water flow

摘要

The ground is excavated below ground water strata. The dry trench is filled after completion of tunnel and ground water movement path is opened. This system can be used for any construction depth and water movement is readily ensured. The construction is installed at first with concrete wall sections with gaps which are filled with frozen filling material. The excavation is completed subsequently and the frozen wall sections ensure full depth of construction. The ground water movement is freed subsequently when the frozen filling has thawed.