Boring device

A boring device that is inserted into a lateral pipe to bore a pipe lining material which is inserted into a main pipe across the lateral pipe intersecting therewith and a portion of which blocks an opening of the lateral pipe that communicates with the main pipe, the boring device comprising:

• a rotatable shaft mounted to undergo rotation;
• a bearing member for rotatably bearing the rotatable shaft;
• a boring blade mounted on the rotatable shaft for rotation therewith to bore through the portion of the pipe lining material that is blocking the opening of the lateral pipe;
• a supporting member mounted on one side of an external periphery of the bearing member;
• and
• an inflatable bag mounted on the other side of the external periphery of the bearing member and inflatable in the lateral pipe so that the inflatable bag and the supporting member are pressed against an internal peripheral surface of the lateral pipe to position the rotatable shaft and the boring blade in a direction orthogonal to a longitudinal direction of the lateral pipe when the boring blade bores through the portion of the pipe lining material that is blocking the opening of the lateral pipe.

A boring device that is inserted into a lateral pipe to bore a pipe lining material which is inserted into a main pipe across the lateral pipe intersecting therewith, the boring device comprising:

• a rotatable shaft mounted to undergo rotation;
• a boring blade mounted on the rotatable shaft for rotation therewith to bore the pipe lining material;
• a bearing member for rotatably bearing the rotatable shaft;
• a mounting member connected to one side of an external periphery of the bearing member;
• a supporting member connected to the other side of the external periphery of the bearing member;
• and
• an inflatable bag detachably mounted on the mounting member, the inflatable bag being inflatable in the lateral pipe so that the inflatable bag and the supporting member are pressed against an internal peripheral surface of the lateral pipe to position the rotatable shaft and the boring blade in a direction orthogonal to a longitudinal direction of the lateral pipe when the boring blade bores the pipe lining material.