JP2021021483A5 - - Google Patents

Claims (11)

A branch pipe connecting member used for connecting a branch pipe to a main pipe,
an inner surface fixing portion fixed to the inner peripheral surface of the main pipe in the peripheral portion of the opening bored in the main pipe;
a branch pipe joint portion that can connect the branch pipe so as to communicate with the main pipe;
The inner fixing part is
a plurality of curved pieces curved along the inner peripheral surface of the main pipe;
a connecting portion that rotatably connects the plurality of curved pieces about a predetermined rotation axis extending in a generatrix direction of the curved pieces;
By rotating the plurality of curved pieces via the connecting portion,
an elongated state in which a plurality of the curved pieces extend through the connecting portion and joint portions between the adjacent curved pieces are continuous;
A plurality of the curved pieces are bent through the connecting portion, and can be switched to a deformed state in which the joint portions of the adjacent curved pieces are discontinuous,
A branch pipe connecting member, wherein the rotation axis is offset from the curved piece toward the center of curvature of the curved piece in the extended state. Having an outer surface fixing part that directly or indirectly abuts against the outer peripheral surface of the main pipe in the peripheral part of the opening bored in the main pipe,
2. The branch pipe connection member according to claim 1, wherein the main pipe can be sandwiched between the outer surface fixing portion and the inner surface fixing portion. The branch pipe joint portion has a cylindrical portion continuous with the inner fixing portion and having a threaded portion formed on the outer peripheral surface,
wherein the threaded portion has a helical male thread formed in the axial direction of the cylindrical portion;
Having a ring member that can be screwed onto the male screw,
By screwing the ring member onto the threaded portion, the outer surface fixing portion can be arranged between the ring member and the inner surface fixing portion,
While disposing the main pipe between the inner surface fixing portion and the outer surface fixing portion, the inner surface is fixed by screwing the ring member to the cylindrical portion protruding from the opening to the outside of the main pipe. 3. The branch pipe connection member according to claim 2, wherein the main pipe can be sandwiched between the fixing portion and the outer surface fixing portion. The branch pipe joint portion is configured by combining a plurality of joint constituent portions that can be assembled and separated in conjunction with the rotation of the curved piece,
In the elongated state, a plurality of the joint constituent parts are assembled to form a tubular part,
4. The apparatus according to any one of claims 1 to 3, further comprising a holding member that holds a plurality of said joint constituting parts in an aggregated state by being attached to said tubular part from the outer peripheral side in said extended state. The branch pipe connecting member according to any one of the above. A male thread is formed on an outer peripheral surface of the joint constituting portion forming the cylindrical portion,
5. The branch pipe connection member according to claim 4, wherein the holding member is a ring member having a female thread on the inner peripheral surface thereof that can be screwed onto the male thread . Having a tubular branch pipe connection adapter continuous with the ring member,
The branch pipe can be connected so as to communicate with the branch pipe joint portion by directly or indirectly connecting the branch pipe to the branch pipe connection adapter. 5. The branch pipe connection member according to 5. 7. The branch pipe connection member according to claim 6, wherein the branch pipe connection adapter is detachable from the holding member. The holding member is an annularly formed ring member,
The ring member has a protruding portion that protrudes radially inward,
By inserting the branch pipe connection adapter into the opening region of the ring member from one side in the axial direction of the ring member, the outer peripheral surface of the branch pipe connection adapter comes into contact with the inner peripheral surface of the ring member. is connected to the ring member while the end of the branch pipe connection adapter is in contact with the protrusion,
By inserting the branch pipe joint into the opening region of the ring member from the other side of the ring member in the axial direction, the outer peripheral surface of the branch pipe joint contacts the inner peripheral surface of the ring member. The end of the branch pipe joint portion is connected to the ring member while the end portion of the branch pipe joint portion is in contact with the projecting portion, and the branch pipe connection adapter and the branch pipe joint portion are in communication with each other. The branch pipe connecting member according to claim 6 or 7. The branch pipe according to any one of claims 1 to 8, further comprising a biasing member that, in the deformed state, exerts a biasing force on the plurality of curved pieces in the direction of the elongated state. connecting member. the biasing member exerts the biasing force at least in a bent state in which the inner surface fixing portion is bent ;
10. The branch pipe connection member according to claim 9, wherein the biasing member is provided on a surface of each of the plurality of curved pieces that faces the center of curvature. The biasing member constitutes the connecting portion, is provided so as to straddle the plurality of curved pieces, and is offset from the curved piece toward the center of curvature of the curved piece. 11. The branch pipe connection member according to claim 10, wherein the branch pipe connecting member is bendable so as to form the rotation axis at.