PIPE JOINT

摘要

An annular sealing material seals a pipe joint between a socket and a spigot. The sealing material includes a bulb part which is composed of a first bulb, a second bulb located closer to the inner side of the socket than the first bulb, and a narrow part present between the first and second bulbs. The first bulb is pressed against the inner circumferential surface of the socket. The second bulb is pressed against the outer peripheral surface of the spigot. The second bulb is inclined towards the pipe center from the first bulb in a natural state before it is provided between the socket and the spigot. The inner diameter of the second bulb is smaller than the outer diameter of the spigot in the natural state. The second bulb is extensible in the pipe diameter direction due to elastic deformation of the narrow part.

主权项

1. A spacer for a pipe joint in which a spigot formed at an end of one pipe is inserted into a socket formed at an end of another pipe, the pipes being joined to each other,
an annular lock ring is accommodated in a lock ring accommodating groove formed on an inner circumference of the socket, the lock ring including a divided part in a circumferential direction and being elastically expansible in diameter, a protrusion is formed on an outer periphery of the spigot, and the protrusion of the spigot is allowed to pass through the lock ring having an expanded diameter, and the diameter-expanded state of the lock ring is released after the passage of the protrusion, the spacer being capable of being inserted into and removed out from the divided part of the lock ring and maintaining the lock ring in a diameter-expanded state when the spacer is inserted into the divided part, the spacer comprising: a maintaining portion for maintaining the diameter of the lock ring in an expanded state being capable of being inserted into and removed out from a gap between two ends of the lock ring along the circumferential direction at the divided part, and being interposed between the two ends when the maintaining portion is inserted; and a handle reaching from the maintaining portion outside the socket beyond a socket opening portion when the maintaining portion is interposed between the two ends of the lock ring, wherein the spacer is capable of being removed out from the gap between the two ends of the lock ring at the divided part after the spigot is inserted into the socket, passing through a space between the socket and the spigot and being collected outside the socket beyond the socket opening portion, the spacer further comprises insertion grooves on two side portions of the maintaining portion, the two ends of the lock ring can be fitted into the insertion grooves when the maintaining portion is inserted into the gap between the two ends of the lock ring at the divided part, and the maintaining portion is capable of being detached in a removal direction from the two ends of the lock ring when the maintaining portion moves to be removed out from the gap between the two ends of the lock ring at the divided part.