| 摘要 |
A pipe restraint device that will prevent pressure-induced separation of cast iron soil pipes or the like joined by a sealing coupling comprises at least one stiff yet forceably springable rod having lengths thereof curved to substantially the outside curvature of the pipe and forming two coils spaced apart for encircling respective pipe surfaces at opposite sides of the sealing coupling, with end portions of the rod or rods arranged in oppositely directed first and second pairs defining a contractable region of the coils; and structures including at least one rigid strut bracket formed to bridge the sealing coupling axially are engaged with the pairs of rod end portions for displacing them relative to one another substantially tangentially under great tension and holding them so displaced in immovably tight engagement upon the pipe surfaces. The coils can be formed by curved lengths of a single rod, or of two separate rods; or by two or more rods each prebent to a U shape or a closed loop form providing two curved lengths, with a rigid strut plate joining portions of these rods away from the strut bracket. Portions of the curved lengths away from the strut bracket are restrained axially by one or more tying members that bridge a sealing coupling and have edge channels underlying the rods. Such tying members in some forms serve also as the gasket confining shield of a pipe joint sealing coupling.
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