The expanding tunnel and constructing method of the existing tunnel

摘要

The present invention relates to an extension technology of an existing tunnel constructed on rocky ground conditions, and the housing is installed at regular intervals along the lining of the existing tunnel, and the excavating equipment equipped with an auger excavator is installed in the housing step by step. It is an extension tunnel that drills and removes the rock between the existing tunnel lining and the expansion tunnel rig wall after drilling unit drilling holes and placing reinforcing bars in the rig to form expansion tunnel rig walls. .;The construction method includes installing a housing having a predetermined length at a predetermined distance from a lining of an existing tunnel and gradually entering the hydraulic jack so that half of the entire housing length is excavated at a rock above the lining of the existing tunnel;;Installing an excavation equipment equipped with an auger excavator on the upper part of the lining to protrude to the existing tunnel entrance and installing an expansion tunnel excavation wall wall by drilling a unit excavation hole stepwise;;Assembling and installing reinforcing bars in the unit excavation hole and constructing concrete for spreading the expansion tunnel excavation cavity wall to form an expansion tunnel excavation cavity wall;;Digging and removing the rock between the existing tunnel lining and the expansion tunnel drilling hole wall;;Moving the housing for the next excavation and repeating the steps by using the excavation equipment installed in the housing to form an expansion tunnel excavation hole wall to finish construction of the expansion tunnel; And;In order to communicate the traffic of the completed expansion tunnel, the road surface should be arranged and paved, and the facilities such as lighting inside the tunnel will be used so that the tunnel can be used.