Patent ID: 9644778
Date: 2017-05-09
CPC Classifications: F16K,F16L

Claim:
1. A flow-undisrupted apparatus to which a boring machine including a cutter for boring a portion of a pipe wall of an existing pipe to form an opening in the pipe wall is attached, the flow-undisrupted apparatus allowing the boring machine to be removed therefrom after the opening is formed, the flow-undisrupted apparatus comprising: a sealing case including a plurality of separate cases separated from, one another in a circumferential direction of the existing pipe for enclosing a portion of the existing pipe; and a rubber packing for sealing a gap between the sealing case and the existing pipe, wherein; a branch-shaped branch pipe portion is formed in a first separate case, which is one of the plurality of separate cases, the branch pipe portion defining a branch hole extending in a radial direction of the existing pipe; the branch pipe portion of the first separate case is provided with, a flange for allowing for attachment and removal of the boring machine; the sealing case is capable of reciprocating in a pipe axis direction of the existing pipe; and the rubber packing forms: the rubber packing includes a first, second and third seal rings forming the first sealed area and the second sealed area; each of the rings is attached to a packing attachment groove of the sealing case while being in contact with an outer periphery surface of the existing pipe; and between the second seal ring and the packing attachment groove placed between the first and second, sealed areas, a tolerance space is defined on a side of the branch hole of an outer periphery edge of the second seal ring, the tolerance space allowing the second seal ring to deform, within the packing attachment groove, outward in the radial direction of the existing pipe.